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1

Precocious sexual signalling and mating in Anastrepha fraterculus (Diptera: Tephritidae) sterile males achieved through juvenile hormone treatment and protein supplements.  

PubMed

Sexual maturation of Anastrepha fraterculus is a long process. Methoprene (a mimic of juvenile hormone) considerably reduces the time for sexual maturation in males. However, in other Anastrepha species, this effect depends on protein intake at the adult stage. Here, we evaluated the mating competitiveness of sterile laboratory males and females that were treated with methoprene (either the pupal or adult stage) and were kept under different regimes of adult food, which varied in the protein source and the sugar:protein ratio. Experiments were carried out under semi-natural conditions, where laboratory flies competed over copulations with sexually mature wild flies. Sterile, methoprene-treated males that reached sexual maturity earlier (six days old), displayed the same lekking behaviour, attractiveness to females and mating competitiveness as mature wild males. This effect depended on protein intake. Diets containing sugar and hydrolyzed yeast allowed sterile males to compete with wild males (even at a low concentration of protein), while brewer´s yeast failed to do so even at a higher concentration. Sugar only fed males were unable to achieve significant numbers of copulations. Methoprene did not increase the readiness to mate of six-day-old sterile females. Long pre-copulatory periods create an additional cost to the management of fruit fly pests through the sterile insect technique (SIT). Our findings suggest that methoprene treatment will increase SIT effectiveness against A. fraterculus when coupled with a diet fortified with protein. Additionally, methoprene acts as a physiological sexing method, allowing the release of mature males and immature females and hence increasing SIT efficiency. PMID:22929968

Liendo, M C; Devescovi, F; Bachmann, G E; Utgés, M E; Abraham, S; Vera, M T; Lanzavecchia, S B; Bouvet, J P; Gómez-Cendra, P; Hendrichs, J; Teal, P E A; Cladera, J L; Segura, D F

2012-08-29

2

Genetic male sterility in wheat  

Microsoft Academic Search

The occurrence of genetic male sterility and development of highly sterile lines have been reported. The male sterility was not accompanied by any visible chromosomal aberration. It behaved as recessive and was governed by multiple factors. It was hypothesised that three major genes with additive effect were operating to produce highly sterile forms while less sterile forms would be dependent

D. S. Athwal; P. S. Phul; J. L. Minocha

1967-01-01

3

Manipulation of the microbiota of mass-reared Mediterranean fruit flies Ceratitis capitata (Diptera: Tephritidae) improves sterile male sexual performance  

Microsoft Academic Search

The sterile insect technique (SIT) is a method of biological control whereby millions of factory reared sterile male insects are released into the field. This technique is commonly used to combat the Mediterranean fruit fly (Ceratitis capitata, Diptera: Tephritidae). Sterile medfly males are less competent in attracting and mating with wild females, a property commonly linked to the irradiation process

Eyal Ben Ami; Boaz Yuval; Edouard Jurkevitch

2010-01-01

4

Precocious sexual signalling and mating in Anastrepha fraterculus (Diptera: Tephritidae) sterile males achieved through juvenile hormone treatment and protein supplements  

Technology Transfer Automated Retrieval System (TEKTRAN)

Sexual maturation of Anastrepha fraterculus is a long process. Methoprene (a mimic of juvenile hormone) considerably reduces the time for sexual maturation in males. However, in other Anastrepha species, this effect depends on protein intake at the adult stage. Here, we evaluated the mating competit...

5

Male sterility derived from Cajanus sericeus × Cajanus cajan : Confusion of cytoplasmic male sterility with dominant genic male sterility  

Microsoft Academic Search

The male sterile plants that segregated in a BC5F2 of `C. sericeus × C. cajan var. TT-5' population were maintained by sib mating. The male sterile plants were crossed with ICPL-85012.Approximately 50%\\u000a of the F1 plants were sterile. F2 plants derived from the fertile F1 plants did not segregate for male sterility. The reciprocal hybrid i.e. ICPL-85012 × Fertile derivatives

K. B. Wanjari; A. N. Patil; M. C. Patel; J. G. Manjaya

2000-01-01

6

Post-Teneral Protein Feeding Improves Sexual Competitiveness But Reduces Longevity of Mass-Reared Sterile Male Mediterranean Fruit Flies (Diptera: Tephritidae)  

Microsoft Academic Search

The sterile insect technique is gaining an increasing role in the control of Mediter- ranean fruit fly, Ceratitis capitata (Wiedemann), populations. In the current study, we examine how post-teneral nutrition during the first 4—8 d after adult emergence affects performance and copu- latory success in leks of mass-reared sterile (TSL strain) males. We found that protein and sugar fed males

Roy Kaspi; Boaz Yuval

2000-01-01

7

The Decision for Male versus Female Sterilization.  

ERIC Educational Resources Information Center

The increasing popularity of sterilization underscores the need for knowledge about couples choosing male and female procedures. This research delineates four sets of variables that may be important for the decision and examines their relationship with the choice of male or female procedure among a sample of married couples. (Author)

Clark, Margaret Pruitt; And Others

1979-01-01

8

Mutant meiotic chromosome core components in mice can cause apparent sexual dimorphic endpoints at prophase or X–Y defective male-specific sterility  

Microsoft Academic Search

Genetic modifications causing germ cell death during meiotic prophase in the mouse frequently have sexually dimorphic phenotypes where oocytes reach more advanced stages than spermatocytes. To determine to what extent these dimorphisms are due to differences in male versus female meiotic prophase development, we compared meiotic chromosome events in the two sexes in both wild-type and mutant mice. We report

Nadine K. Kolas; Edyta Marcon; Michael A. Crackower; Christer Höög; Josef M. Penninger; Barbara Spyropoulos; Peter B. Moens

2005-01-01

9

Comparative Risks and Costs of Male and Female Sterilization.  

National Technical Information Service (NTIS)

Couples who are considering elective sterilization should compare the risks and costs of male and female sterilization procedures as part of the decision process. Morbidity, mortality, failure rates, and short-term costs associated with male and female st...

G. L. Smith G. P. Taylor K. F. Smith

1975-01-01

10

Cytoplasmic male sterility in the olive (Olea europaea L.)  

Microsoft Academic Search

The olive tree is usually hermaphrodite but self-incompatible. In the Western Mediterranean some cultivars are totally male-sterile.\\u000a Three different male-sterile phenotypes have been recognised. To infer the genetic basis of male sterility we studied its\\u000a inheritance and cytoplasmic diversity in wild (oleaster) and cultivated Mediterranean olive. In the cross Olivière×Arbequina, the male-sterile trait was maternally inherited and affected all progenies.

G. Besnard; B. Khadari; P. Villemur; A. Bervillé

2000-01-01

11

Natural male sterile mutant in hot chilli (Capsicum annuum L.)  

Microsoft Academic Search

A natural male sterile mutant was recovered from the normal population of chilli cv. CA 452-1. The male sterility in the mutant was governed by a single recessive gene ms. The excessive vegetative growth provided easy identification of male sterile plants in the seedling stage. The plant was found to be promising for hybrid seed production.

L. D. Meshram; M. N. Narkhede

1982-01-01

12

Mitochondrial DNA modifications associated with cytoplasmic male sterility in rice  

Microsoft Academic Search

Mitochondrial DNA was isolated from fertile and cytoplasmic male sterile lines of rice. Restriction analysis showed specific modifications in the male sterile cytoplasm. In addition to the major mitochondrial DNA, three small plasmid-like DNA molecules were detected by agarose gel electrophoresis in both cytoplasms. An additional molecule was specifically found in the sterile cytoplasm. These mitochondrial DNA modifications support the

H. Mignouna; S. S. Virmani; M. Briquet

1987-01-01

13

Sexual Assault of Adult Males  

Microsoft Academic Search

The circumstances and characteristics of sexual assaults against adult males presenting to a crisis unit in a large metropolitan area were examined. Twenty-nine men, ranging in age from 18 to 65, who were victims of sexual assaults or attempted sexual assaults, were seen over a 16-month period. Information extracted from the unit database included client demographics and personal history, assault

LANA STERMAC; PETER M. SHERIDAN; ALISON DAVIDSON; SHEILA DUNN

1996-01-01

14

The Nucleo-Mitochondrial Conflict in Cytoplasmic Male Sterilities Revisited  

Microsoft Academic Search

Cytoplasmic male sterility (CMS) in plants is a classical example of genomic conflict, opposing maternally-inherited cytoplasmic genes (mitochondrial genes in most cases), which induce male sterility, and nuclear genes, which restore male fertility. In natural populations, this type of sex control leads to gynodioecy, that is, the co-occurrence of female and hermaphroditic individuals within a population. According to theoretical models,

Françoise Budar; Pascal Touzet; Rosine De Paepe

2003-01-01

15

Gene, protein, and network of male sterility in rice  

PubMed Central

Rice is one of the most important model crop plants whose heterosis has been well-exploited in commercial hybrid seed production via a variety of types of male-sterile lines. Hybrid rice cultivation area is steadily expanding around the world, especially in Southern Asia. Characterization of genes and proteins related to male sterility aims to understand how and why the male sterility occurs, and which proteins are the key players for microspores abortion. Recently, a series of genes and proteins related to cytoplasmic male sterility (CMS), photoperiod-sensitive male sterility, self-incompatibility, and other types of microspores deterioration have been characterized through genetics or proteomics. Especially the latter, offers us a powerful and high throughput approach to discern the novel proteins involving in male-sterile pathways which may help us to breed artificial male-sterile system. This represents an alternative tool to meet the critical challenge of further development of hybrid rice. In this paper, we reviewed the recent developments in our understanding of male sterility in rice hybrid production across gene, protein, and integrated network levels, and also, present a perspective on the engineering of male-sterile lines for hybrid rice production.

Wang, Kun; Peng, Xiaojue; Ji, Yanxiao; Yang, Pingfang; Zhu, Yingguo; Li, Shaoqing

2013-01-01

16

Allelic relationship of four male sterility genes and nucleo-cytoplasmic interactions in the expression of male sterility in pearl millet, Pennisetum americanum (L.) leeke  

Microsoft Academic Search

Male sterility genes isolated in four inbred lines of pearl millet were found allelic. The differences between male fertile and male sterile phenotypes is mainly due to a single gene. Presence of a dominant gene (Ms) resulted in male fertility and double recessiveness (ms ms) in male sterility. However, genic male sterility (GMS) in Pennisetum is not a simply inherited

M. Krishna Rao; K. Uma Devi

1989-01-01

17

Dopamine and Male Sexual Function  

Microsoft Academic Search

The use of the D1/D2 dopamine receptor agonist apomorphine for the treatment of erectile dysfunction provides strong support in favor of a participation of the dopaminergic system in the control of sexual function. However, the exact involvement of dopamine in the control of sexual motivation and genital arousal in males is unknown. Experimental data in male rats suggested an implication

François Giuliano; Julien Allard

2001-01-01

18

A cryptic cytoplasmic male sterility unveils a possible gynodioecious past for Arabidopsis thaliana.  

PubMed

Gynodioecy, the coexistence of hermaphrodites and females (i.e. male-sterile plants) in natural plant populations, most often results from polymorphism at genetic loci involved in a particular interaction between the nuclear and cytoplasmic genetic compartments (cytonuclear epistasis): cytoplasmic male sterility (CMS). Although CMS clearly contributes to the coevolution of involved nuclear loci and cytoplasmic genomes in gynodioecious species, the occurrence of CMS genetic factors in the absence of sexual polymorphism (cryptic CMS) is not easily detected and rarely taken in consideration. We found cryptic CMS in the model plant Arabidopsis thaliana after crossing distantly related accessions, Sha and Mr-0. Male sterility resulted from an interaction between the Sha cytoplasm and two Mr-0 genomic regions located on chromosome 1 and chromosome 3. Additional accessions with either nuclear sterility maintainers or sterilizing cytoplasms were identified from crosses with either Sha or Mr-0. By comparing two very closely related cytoplasms with different male-sterility inducing abilities, we identified a novel mitochondrial ORF, named orf117Sha, that is most likely the sterilizing factor of the Sha cytoplasm. The presence of orf117Sha was investigated in worldwide natural accessions. It was found mainly associated with a single chlorotype in accessions belonging to a clade predominantly originating from Central Asia. More than one-third of accessions from this clade carried orf117Sha, indicating that the sterilizing-inducing cytoplasm had spread in this lineage. We also report the coexistence of the sterilizing cytoplasm with a non-sterilizing cytoplasm at a small, local scale in a natural population; in addition a correlation between cytotype and nuclear haplotype was detected in this population. Our results suggest that this CMS system induced sexual polymorphism in A. thaliana populations, at the time when the species was mainly outcrossing. PMID:23658632

Gobron, Nicolas; Waszczak, Cezary; Simon, Matthieu; Hiard, Sophie; Boivin, Stéphane; Charif, Delphine; Ducamp, Aloïse; Wenes, Estelle; Budar, Françoise

2013-04-29

19

QTL analysis of fertility restoration in cytoplasmic male sterile pepper  

Microsoft Academic Search

Fertility restoration of Peterson’s cytoplasmic male-sterility in pepper ( Capsicum annuum L.) is quantitative and environment-dependent. QTL analysis of fertility restoration was performed based on the test-cross progeny of 77013A (a strict cytoplasmic-genetic male sterile line) and a doubled haploid population of 114 lines obtained from an F 1 hybrid between Yolo wonder (a sterility maintainer line) and Perennial (a

L. H. Wang; B. X. Zhang; V. Lefebvre; S. W. Huang; A. M. Daubèze; A. Palloix

2004-01-01

20

Male sexual dysfunction in Asia  

PubMed Central

Sex has always been a taboo subject in Asian society. However, over the past few years, awareness in the field of men's sexual health has improved, and interest in sexual health research has recently increased. The epidemiology and prevalence of erectile dysfunction, hypogonadism and premature ejaculation in Asia are similar in the West. However, several issues are specific to Asian males, including culture and beliefs, awareness, compliance and the availability of traditional/complementary medicine. In Asia, sexual medicine is still in its infancy, and a concerted effort from the government, relevant societies, physicians and the media is required to propel sexual medicine to the forefront of health care.

Ho, Christopher CK; Singam, Praveen; Hong, Goh Eng; Zainuddin, Zulkifli Md

2011-01-01

21

Genetics and cytology of a genic male-sterile, female-sterile mutant from a transposon-containing soybean population  

Microsoft Academic Search

A male-sterile, female-sterile soybean mutant (w4-m sterile) was identified among progeny of germinal revertants of a gene-tagging study. Our objectives were to determine the genetics (inheritance, allelism, and linkage) and the cytology (micro- sporogenesis and microgametogenesis) of the w4-m sterile. The mutant was in- herited as a single recessive nuclear gene and was nonallelic to known male-sterile, female-sterile mutants st2

R. G. Palmer; H. T. Horner

2000-01-01

22

Anther developmental defects in Arabidopsis thaliana male-sterile mutants  

Microsoft Academic Search

We identified Arabidopsis thaliana sterility mutants by screening T-DNA and EMS-mutagenized lines and characterized several male-sterile mutants with defects\\u000a specific for different anther processes. Approximately 44 and 855 sterile mutants were uncovered from the T-DNA and EMS screens,\\u000a respectively. Several mutants were studied in detail with defects that included the establishment of anther morphology, microspore\\u000a production, pollen differentiation, and anther

Paul M. Sanders; Anhthu Q. Bui; Koen Weterings; Katherine N. McIntire; Yung-Chao Hsu; Pei Yun Lee; Mai Thy Truong; T. P. Beals; R. B. Goldberg

1999-01-01

23

Modeling the suppression of sea lamprey populations by the release of sterile males or sterile females  

USGS Publications Warehouse

The suppressive effects of trapping adult sea lampreys, Petromyzon marinus Linnaeus, and releasing sterile males (SMRT) or females (SFRT) into a closed system were expressed in deterministic models. Suppression was modeled as a function of the proportion of the population removed by trapping, the number of sterile animals released, the reproductive rate and sex ratio of the population, and (for the SFRT) the rate of polygyny. Releasing sterile males reduced populations more quickly than did the release of sterile females. For a population in which 30% are trapped, sterile animals are initially released at ratio of 10 sterile to 1 fertile animal, 5 adult progeny are produced per fertile mating, 60% are male, and males mate with an average of 1.65 females, the initial population is reduced 87% by SMRT and 68% by SFRT in one generation. The extent of suppression achieved is most sensitive to changes in the initial sterile release ratio. Given the current status of sea lamprey populations and trapping operations in the Great Lakes, the sterile-male-release technique has the best chance for success on a lake-wide basis if implemented in Lake Michigan. The effectiveness of the sterile-female-release technique should be investigated in a controlled study. Advancing trapping technology should be a high priority in the near term, and artificial rearing of sea lampreys to the adult stage should be a high priority in the long term. The diligent pursuit of sea lamprey suppression over a period of several decades can be expected to yield great benefits.

Klassen, Waldemar; Adams, Jean V.; Twohey, Michael B.

2004-01-01

24

Factors responsible for levels of male sterility in photoperiod-sensitive cytoplasmic male sterile (PCMS) wheat lines  

Microsoft Academic Search

A `two-line system' using photoperiod-sensitivecytoplasmic male sterility (PCMS) caused by Aegilops crassa cytoplasm has been proposed as a newmeans of producing hybrid wheat. The PCMS line ismaintained by self-pollination under short-dayconditions (?14.5 h light period), and F1 seedscan be produced by outcrossing of the PCMS line witha pollinator under long-day conditions (?15 h lightperiod). As the levels of male sterility

Koji Murai

2001-01-01

25

Evaluation of Male Sexual Dysfunction  

Microsoft Academic Search

\\u000a The management of male sexual dysfunction and specifically erectile dysfunction (ED) has seen major changes in each decade\\u000a since the 1970s thanks to the discovery that a papaverine injection could produce erection, the NIH Consensus Statement which\\u000a defined ED in 1992, advances in minimally invasive diagnostics, and the development of orally effective erectogenic class\\u000a of drugs, the phosphodiesterase type-5 inhibitors

Gregory A. Broderick

26

Cytochemical investigation of genic male-sterility in Chinese cabbage  

Microsoft Academic Search

A genic male sterile Chinese cabbage, Brassica campestris L. ssp. chinensis Makino, was examined using cytological and cytochemical methods to characterize the process of pollen abortion in this plant.\\u000a Thick sections of both fertile and sterile anthers at different developmental stages were stained using Toluidine Blue O,\\u000a Periodic Acid-Schiff’s (PAS) reaction and Sudan Black B to detect cytochemical changes that

YH Yang; YL Qiu; XY Zhu; HQ Tian

2005-01-01

27

Study of male sterility in Taiwania cryptomerioides Hayata (Taxodiaceae)  

Microsoft Academic Search

Summary.  A study of male sterility over a period of three consecutive years on a conifer species endemic to Taiwan, Taiwania cryptomerioides Hayata (Taxodiaceae), was done for this article. With the aids of fluorescence and electron microscopic observations, the\\u000a ontogenic processes in the fertile and sterile microsporangia are compared, using samples collected from Chitou Experimental\\u000a Forest and Yeou-Shoei-Keng Clonal Orchard of

S.-H. Chen; N.-J. Chung; Y.-N. Wang; C.-L. Lee; Y.-L. Lee; P.-F. Tsai

2006-01-01

28

Sexual Identity Development Among Ethnic Sexual-Minority Male Youths  

Microsoft Academic Search

The current research explores how ethnicity influences sexual identity development. Among 139 sexual-minority male youths, measures of sexual identity development assessed the timing and sequencing of developmental milestones, disclosure of sexual identity to others, internalized homophobia, and same- and opposite-sex relationship histories. Findings demonstrated that participants, regardless of ethnicity, experienced most identity milestones at developmentally appropriate ages, had moderately low

Eric M. Dubé; Ritch C. Savin-Williams

1999-01-01

29

JAMA Patient Page: Male Sexual Dysfunction  

MedlinePLUS

... sexual dysfunction can be caused by physical or psychological problems. The June 23/30, 2004, issue of JAMA includes an article about the various types of male sexual dysfunction and treatments for them. ...

30

Does male sexual behavior require progesterone?  

Microsoft Academic Search

In this article, we provide a concise review of the past and current literature on the neglected influence of progesterone on male sexual behavior. Although there has been increased interest in all aspects of male sexual function, and the importance of androgens in the regulation of male copulatory behavior has long been well documented, knowledge of the role of progesterone

Monica Levy Andersen; Sergio Tufik

2006-01-01

31

Ethical issues in male sterilization in developing countries.  

PubMed

The history of sterilization dates back to the time of Hippocrates, when female sterilization was recommended for preventing hereditary mental diseases. James Blundell introduced surgical sterilization in 1823 for the prevention of high risk pregnancies. Vasectomy was first performed in the US at the end of the 19th century, mainly to prevent hereditary disorders. Male sterilization was a means of genocide during Nazi rule in Germany. Religious beliefs have the most powerful impact on the practice or nonpractice of family planning. In the teachings of Islam, Christianity, and Judaism, only sporadic references explicitly prohibit contraception, yet various religious edicts have interpreted these references too broadly by advocating prohibition of most contraceptive methods. Recently, the world community endorsed the basic right of couples to decide the number of children they want and the right to family planning with free informed choice. An integral part of a successful family planning program is voluntarism. In Europe and North America sterilization is legal, except in Italy, France, and Turkey. In Latin America sterilization is illegal in a number of countries; in Burma and Vietnam restrictions are in place; and in Africa fertility regulation is illegal in one-third of the countries. Informed consent before sterilization during counseling by a skilled, unbiased counselor is indispensable. All family planning services should be part of the national health care system including the voluntary contraception services. Incentives may compromise voluntarism. Most programs require a minimum age and a minimum number of children, marital status, and spousal consent. For sterilization, a waiting period of 1-30 days has been recommended. The exclusion of childless and single individuals has been challenged as a violation of human rights. For mentally retarded people parents or guardians provide consent. Major ethical issues in the future could emerge concerning novel fertility techniques: cryopreservation of sperm and intracytoplasmic sperm injection. PMID:8535748

Rizvi, S A; Naqvi, S A; Hussain, Z

1995-11-01

32

Chromosomal monogenic dominant male sterility in chinese cabbage ( Brassica rapa supbs. pekinensis (Lour.) hanelt)  

Microsoft Academic Search

Strong indication was found for the existence of a chromosal monogenic dominant male sterility-gene in chenese cabbage. This source of male sterility can be of practical use for the production of hybrid varieties. A pronounced drawback is the required removal, in the breeding and seed production stage, of the approximately 50% male fertile plants from each offspring of male sterile

Q. P. Meer

1987-01-01

33

Cytoplasmic male sterility in alloplasmic Brassica juncea carrying Diplotaxis catholica cytoplasm: molecular characterization and genetics of fertility restoration  

Microsoft Academic Search

The present study was aimed at characterizing cytoplasmic male sterility (CMS) and identifying the fertility restorer gene for CMS ( Diplotaxis catholica) Brassica juncea derived through sexual hybridization. The fertility restorer gene was identified by crossing the CMS line with progeny plants derived from somatic hybrids of B. juncea and D. cathoilca. The CMS line is comparable to the nuclear

A. Pathania; S. R. Bhat; V. Dinesh Kumar; Ashutosh; P. B. Kirti; S. Prakash; V. L. Chopra

2003-01-01

34

Genetics and Evolution of Hybrid Male Sterility in House Mice  

PubMed Central

Comparative genetic mapping provides insights into the evolution of the reproductive barriers that separate closely related species. This approach has been used to document the accumulation of reproductive incompatibilities over time, but has only been applied to a few taxa. House mice offer a powerful system to reconstruct the evolution of reproductive isolation between multiple subspecies pairs. However, studies of the primary reproductive barrier in house mice—hybrid male sterility—have been restricted to a single subspecies pair: Mus musculus musculus and Mus musculus domesticus. To provide a more complete characterization of reproductive isolation in house mice, we conducted an F2 intercross between wild-derived inbred strains from Mus musculus castaneus and M. m. domesticus. We identified autosomal and X-linked QTL associated with a range of hybrid male sterility phenotypes, including testis weight, sperm density, and sperm morphology. The pseudoautosomal region (PAR) was strongly associated with hybrid sterility phenotypes when heterozygous. We compared QTL found in this cross with QTL identified in a previous F2 intercross between M. m. musculus and M. m. domesticus and found three shared autosomal QTL. Most QTL were not shared, demonstrating that the genetic basis of hybrid male sterility largely differs between these closely related subspecies pairs. These results lay the groundwork for identifying genes responsible for the early stages of speciation in house mice.

White, Michael A.; Stubbings, Maria; Dumont, Beth L.; Payseur, Bret A.

2012-01-01

35

Mitochondrially-targeted expression of a cytoplasmic male sterility-associated orf220 gene causes male sterility in Brassica juncea  

Microsoft Academic Search

BACKGROUND: The novel chimeric open reading frame (orf) resulting from the rearrangement of a mitochondrial genome is generally thought to be a causal factor in the occurrence of cytoplasmic male sterility (CMS). Both positive and negative correlations have been found between CMS-associated orfs and the occurrence of CMS when CMS-associated orfs were expressed and targeted at mitochondria. Some orfs cause

Jinghua Yang; Xunyan Liu; Xiaodong Yang; Mingfang Zhang

2010-01-01

36

Remating behavior in Anastrepha fraterculus (Diptera: Tephritidae) females is affected by male juvenile hormone analog treatment but not by male sterilization.  

PubMed

The sterile insect technique (SIT) has been proposed as an area-wide method to control the South American fruit fly, Anastrepha fraterculus (Wiedemann). This technique requires sterilization, a procedure that affects, along with other factors, the ability of males to modulate female sexual receptivity after copulation. Numerous pre-release treatments have been proposed to counteract the detrimental effects of irradiation, rearing and handling and increase SIT effectiveness. These include treating newly emerged males with a juvenile hormone mimic (methoprene) or supplying protein to the male's diet to accelerate sexual maturation prior to release. Here, we examine how male irradiation, methoprene treatment and protein intake affect remating behavior and the amount of sperm stored in inseminated females. In field cage experiments, we found that irradiated laboratory males were equally able to modulate female remating behavior as fertile wild males. However, females mated with 6-day-old, methoprene-treated males remated more and sooner than females mated with naturally matured males, either sterile or wild. Protein intake by males was not sufficient to overcome reduced ability of methoprene-treated males to induce refractory periods in females as lengthy as those induced by wild and naturally matured males. The amount of sperm stored by females was not affected by male irradiation, methoprene treatment or protein intake. This finding revealed that factors in addition to sperm volume intervene in regulating female receptivity after copulation. Implications for SIT are discussed. PMID:23340454

Abraham, S; Liendo, M C; Devescovi, F; Peralta, P A; Yusef, V; Ruiz, J; Cladera, J L; Vera, M T; Segura, D F

2013-01-23

37

[Male sexual dysfunction and obesity].  

PubMed

Obesity concerns more than 200 million people in the world, with an increasing prevalence in western countries. It is closely related to multiple medical conditions, such as diabetes and hypertension. It was recently shown that testosterone deficiency syndrome and erectile dysfunction (ED) are also linked to male obesity. In this group of patients, ED may be due to defects in corpus cavernosum relaxation, endocrine modifications and nerve signal alterations. Weight loss and increased physical activities can improve erectile function in 30% of obese patients. Additional medical treatments of ED enhance erectile function in more than 80% of patients. Self image improvement associated with appropriate erectile dysfunction medical treatment allow better sexual life and potentially increased motivation for weight loss. PMID:23330231

Lucca, Ilaria; Paduch, Darius A; Pralong, François; Vaucher, Laurent

2012-12-01

38

The male victim of sexual assault.  

PubMed

Under-reporting by male victims is more pronounced than for females victims, and so male victims remain a rarity for most sexual assault aftercare service providers. In this chapter, I present a review of forensic medical and psycho-social literature on male-on-male rape and sexual assault. Where appropriate, comparison is made with female victims, as that is the context with which most aftercare service providers are familiar. The following aspects are covered: prevalence; definitions; social perceptions of perpetrators and victims of sexual assault on males; characteristics of victims and assaults; physiological and psychological responses; and implications for forensic medical investigation. PMID:22951768

McLean, Iain A

2012-08-28

39

Male Sexuality and Couple Sexual Health: A Case Illustration  

Microsoft Academic Search

Male sexual problems are common and offer exceptional opportunities for clinicians to not only relieve distress but enhance individual and relationship satisfaction. However, limited clinical focus on sex behaviors alone often overlook this opportunity. With more comprehensive approaches, clinicians are able to both facilitate improved sexual function and to promote positive, realistic principles for healthy and satisfying male and couple

Michael E. Metz; Barry W. McCarthy

2010-01-01

40

Studying Adolescent Male Sexuality: Where Are We?  

Microsoft Academic Search

This article critically reviews the literature about adolescent males’ sexuality in order to describe the state of the science and to identify promising concepts and research designs that have the potential to guide the next generation of research. A critique was conducted on 94 peer-reviewed studies of sexual behaviors that included a sample of adolescent males; 11 scholarly texts and

Laureen H. Smith; Barbara J. Guthrie; Deborah J. Oakley

2005-01-01

41

Sexuality of Male-to-Female Transsexuals  

Microsoft Academic Search

Blanchard’s (J Nerv Ment Dis 177:616–623, 1989) theory of autogynephilia suggests that male-to-female transsexuals can be\\u000a categorized into different types based on their sexuality. Little previous research has compared the sexuality of male-to-female\\u000a transsexuals to biological females. The present study examined 15 aspects of sexuality among a non-clinical sample of 234\\u000a transsexuals and 127 biological females, using either an online

Jaimie F. Veale; Dave E. Clarke; Terri C. Lomax

2008-01-01

42

A pentatricopeptide repeat-containing gene restores fertility to cytoplasmic male-sterile plants  

Microsoft Academic Search

Known in over 150 species, cytoplasmic male sterility is encoded by aberrant mitochondrial genes that prevent pollen development. The RNA- or protein-level expression of most of the mitochondrial genes encoding cytoplasmic male sterility is altered in the presence of one or more nuclear genes called restorers of fertility that suppress the male-sterile phenotype. Cytoplasmic male sterility\\/restorer systems have been proven

Stéphane Bentolila; Antonio A. Alfonso; Maureen R. Hanson

2002-01-01

43

Complex determination of male sterility in Thymus vulgaris L.: genetic and molecular analysis  

Microsoft Academic Search

Nucleocytoplasmic determination of male sterility in Thymus vulgaris L. has been assumed in all papers attempting to explain the remarkably high frequencies of male steriles found in natural populations of this species. This paper provides strong evidence that both nuclear and cytoplasmic genes are involved in the determination of male sterility of this species, giving a complex inheritance. Interpopulation and

E. Belhassen; B. Dommée; A. Atlan; P. H. Gouyon; D. Pomente; M. W. Assouad; D. Couvet

1991-01-01

44

Transfer of wild abortive cytoplasmic male sterility through protoplast fusion in rice  

Microsoft Academic Search

Wild abortive cytoplasmic male sterility has been extensively used in hybrid seed production in the tropics. Using protoplast fusion between cytoplasmic male sterile and fertile maintainer lines; we report here, transfer of wild abortive cytoplasmic male sterility to the nuclear background of RCPL1-2C, an advance breeding line which also served as maintainer of this cytoplasm. In total, 27 putative cybrids

Bijoya Bhattacharjee; Aniruddha P. Sane; Hari S. Gupta

1999-01-01

45

Ethidium bromide induced cytoplasmic male sterility in pearl millet  

Microsoft Academic Search

Seeds of homozygous ''Tift 23DBâ'' pearl millet (Pennisetum americanum (L.) K. Schum), maintainer for cytoplasmic male sterile (cms) ''Tift 23DAâ,'' were soaked in deionized water solutions of 250 and 1000 ppM of ethidium bromide (EB) at 5°C for 40 hours. Treated seeds were rinsed in tap water for 30 min, surface-dried, and planted in replicated two-row plots in the field

Glenn W. Burton; Wayne W. Hanna

1976-01-01

46

Species?specific enhancement of oviposition of female oriental fruit flies, melon flies, and mediterranean fruit flies when mated with normal males or with males sexually sterilized by tepa or gamma irradiation  

Microsoft Academic Search

Laboratory?reared virgin females of 3 species of Tephritidae oviposited significantly fewer eggs than similar previously mated females. Melon flies, Dacus cucurbitae Coquillett, were most affected (3.0X more eggs for mated females), and Mediterranean fruit flies, Ceratitis capitata (Wiedemann), were least affected; oriental fruit flies, D. dorsalis Hendel, were in between. Numbers of eggs laid by females mated with males treated

Irving Keiser; Mohammad Ashraf; Ernest J. Harris; James A. Silva

1978-01-01

47

Studies on Genetic Male-Sterile Soybeans 1  

PubMed Central

Soybean (Glycine max [L.] Merr.) germplasm, isogenic except for loci controlling male-sterility (ms1) and nodulation (rj1) was utilized to investigate the effects of reproductive tissue development and nitrogen source on the initiation of monocarpic senescence. The experimental genotypes (Ms1Rj1, Ms1rj1, ms1Rj1, and ms1rj1, were selected from a cross between N69-2774 and N59-5259, and were inbred to the F5 generation. Green-house-grown plants were collected during the period of flowering (77 days after transplanting) until maturity (147 days after transplanting). Leaf tissues from the respective genotypes were analyzed at the various harvest dates for RNA, phenolic, and chlorophyll concentrations; acid protease activity; polypeptide banding patterns of chloroplast thylakoids; and chloroplastic ultrastructure. Regardless of nitrogen source, total chlorophyll concentrations declined between 77 and 119 days after transplanting, resulting in a 40% loss of chlorophyll per square centimeter in all genotypes. Leaf chlorophyll levels continued to decline at a constant rate in male-fertile genotypes, but remained at a constant level (26 micrograms chlorophyll per square centimeter) in male-sterile genotypes, for the remainder of the study. With increased leaf age, a gradual disruption of thylakoid structures was observed, particularly in chloroplasts from the male-fertile genotypes. Chloroplasts from the male-sterile genotypes appeared to lose starch grains but increased their number of chloroplastic lipid bodies with leaf aging. These data suggest that monocarpic senescence in soybeans was initiated at or before flowering. Although reproductive tissue development probably augmented the process, the response attributed to seed formation was not apparent until the mid-pod fill stage (119 days after transplanting). All genotypes had similar changes in other cellular components that are recognized as indicators of plant senescence regardless of whether the plants produced seed. Images Fig. 6 Fig. 7

Burke, John J.; Kalt-Torres, Willy; Swafford, James R.; Burton, Joseph W.; Wilson, Richard F.

1984-01-01

48

[Male sexual function after stroke].  

PubMed

Stroke represents the third leading cause of death, ranking behind heart disease and cancer and it is the major cause of worldwide long-term disability after the age of 65. Stroke has an important psychological and emotional impact on the patient and his environment. Some trials show the substantial lowering of libido, of the frequency of sexual intercourse, the presence of erectile dysfunction and reduced sexual satisfaction. After stroke it is important to evaluate the relational and sexual aspects of the patient and his sexual partner. A specialized consultation should be proposed when necessary to optimise the patient's post-stroke rehabilitation. PMID:17503716

Bianchi-Demicheli, F; Sekoranja, L; Temperli, P; Lövblad, K O; Ortigue, S; Sztajzel, R

2007-03-28

49

Expression of sunflower cytoplasmic male sterility-associated open reading frame, orf H522 induces male sterility in transgenic tobacco plants  

Microsoft Academic Search

Sterility in the universally exploited PET1-CMS system of sunflower is associated with the expression of orfH522, a novel mitochondrial gene. Definitive evidence that ORFH522 is directly responsible for male sterility is lacking.\\u000a To test the hypothesis that ORFH522 is sufficient to induce male sterility, a set of chimeric constructs were developed. The\\u000a cDNA of orfH522 was cloned in-frame with yeast

Narasimha Rao Nizampatnam; Harinath Doodhi; Yamini Kalinati Narasimhan; Sujatha Mulpuri; Dinesh Kumar Viswanathaswamy

2009-01-01

50

Voluntary control of male sexual arousal  

Microsoft Academic Search

Forty-eight adult male volunteers attempted to suppress sexual arousal while viewing a sexually explicit videotape and generate an arousal response while viewing a neutral videotape. Attendance to the stimuli was assured by requiring subjects to provide an ongoing verbal description of the videotape they were viewing. While significant effects in controlling arousal were obtained, the degree of subject success varied

John M. Mahoney; Donald S. Strassberg

1991-01-01

51

Genetic studies on cytoplasmic male sterility in maize  

SciTech Connect

Our research concerns the basic mechanisms of cytoplasmic male sterility (CMS) and fertility restoration in maize. The molecular determination of CMS is in the DNA of the mitochondria (mtDNA) but specific nuclear restorer-of-fertility (Rf) genes can overrule the male-sterile effect of the cytoplasm. Our approach to the study of the Rf genes is threefold. We are attempting to tag the cms-S Rf genes and the cms-T Rf2 gene with controlling elements (CEs). Since we have identified a number of spontaneous Rf genes for cms-S and have demonstrated that they are themselves transposable, we are also searching for cases in which an Rf gene is inserted into a wild-type gene. The other aspect of our research involves the nuclear control over the organization of the mitochondrial genome. We found that the changes in mtDNA organization upon cytoplasmic reversion to fertility were characteristic of the nuclear background in which the reversion event occurred. We have investigated whether these differences are a reflection of differences in the organization of the mtDNA genome before reversion.

Laughnan, J.R.

1992-01-01

52

Sexual functioning of male anabolic steroid abusers  

Microsoft Academic Search

The effects of anabolic steroid use on male sexual behavior were assessed using a structured clinical interview administered to male body builders currently using steroids, and to two comparison groups (body builders with a past but not current history of steroid use, and a group of “natural” body builders who had never used steroids). Current anabolic steroid users had a

Howard B. Moss; George L. Panzak; Ralph E. Tarter

1993-01-01

53

Gender Role Socialization and Male-on-Male vs. Female-on-Male Child Sexual Abuse  

Microsoft Academic Search

Most images of sexual abuse in contemporarysociety involve adult male perpetrators and femalevictims. In this paper, we consider the effects of childsexual abuse on the adult male gender roles of boyhood survivors of abuse. Specifically, we examinethe effects of coerced male-on-male (CM), coercedfemale-on-male (CF), and non-coerced female-on-male (NF)sexual contact on attitudes toward and behavior in adult heterosexual relationships. Usinglongitudinal data

Lauren E. Duncan; Linda M. Williams

1998-01-01

54

Female and Male Sterilization and Refertilization in Sweden  

Microsoft Academic Search

In Sweden, approximately 1,500 men and 7,000 women are sterilized yearly. The frequency varies considerably between regions. The reasons for these differences are not fully known. More women than men are sterilized in Sweden, but a higher proportion of sterilized men undergo refertilization. The object of the study was to analyze counselling routines prior to sterilization, presterilization waiting time, the

Bodil E. Ehn; Jerker Liljestrand

1997-01-01

55

Sexual function of the ageing male.  

PubMed

With the progressive increase in the proportion of older people, there is an increasing interest in characterizing the modifications of sexual health and the effect of its perturbations as a function of the aging process. The aim of this review is to summarize the available evidence regarding the age-dependent modifications of male sexual function and their interaction with general health and age-dependent modification of endocrine function. Elderly patients are often affected by multiple organic diseases which can interfere with sexual function. Despite this evidence, several studies have indicated that, with advancing age, normal erections are not an absolute prerequisite to remain sexually active. Good physical health, the availability of a partner, and a regular and stable pattern of sexual activity earlier in life predict the maintenance of sexual activity in old age. Conversely, there are no convincing data that hormonal changes, associated with aging, have a primary role in underlying changes in sexual function in healthy aging men. Nonetheless, sexual dysfunctions especially in elderly people are poor investigated. Asking about sexual health remains difficult or embarrassing for many primary care physicians. In addition, many patients find it difficult to raise sexual issues with their doctor. This situation often results in sexual issues not being adequately addressed thus resulting in depression, social withdrawal and delayed diagnosis of underlying medical conditions often resulting in forthcoming cardiovascular events. Education and permission from a health care professional may help to alter such misconceptions. Information from physicians regarding normal age-related changes in sexuality and encouragement, together with advice on how to continue meaningful sexual relations, may play a key role in altering such negative attitudes. PMID:24054932

Corona, Giovanni; Rastrelli, Giulia; Maseroli, Elisa; Forti, Gianni; Maggi, Mario

2013-06-20

56

A mitochondrial 16 kDa protein is associated with cytoplasmic male sterility in sunflower  

Microsoft Academic Search

Cytoplasmic male-sterile lines CMS89 and CMSBaso of sunflower (Helianthus annuus) differ from the fertile lines HA89 and Baso in a mitochondrial DNA sequence in the vicinity of theatpA gene. In addition, the transcriptional pattern of theatpA gene is changed in male-sterile lines compared to fertile ones. Besides one main transcript in the fertile lines, the male-sterile lines additionally show larger

Renate Horn; Rainer Hans Köhler; Klaus Zetsche

1991-01-01

57

An overview of male-sterility systems in pigeonpea [ Cajanus cajan (L.) Millsp.  

Microsoft Academic Search

For commercial development of hybrids the four pre-requisites are; availability of perfect male-sterility system, efficient\\u000a mass pollen transfer mechanism, hybrid vigor, and the large scale seed production of hybrids for commercialization. The type\\u000a of male-sterility governs the acceptance of hybrids by farmers. Genetic male-sterility (GMS) system was not accepted by farmers\\u000a due to the economics of large scale seed production.

V. A. Dalvi; K. B. Saxena; R. H. Luo; Y. R. Li

2010-01-01

58

Cytogenetic Studies in A4 Cytoplasmic-Nuclear Male-Sterility System of Pigeonpea  

Microsoft Academic Search

Efforts were made to study microsporogenesis and genetics of fertility restoration of A4 cytoplasmic-nuclear male- sterility (CMS) system in pigeonpea. The process of microsporogenesis in the male-sterile (ICPA 2039) and its maintainer (ICPB 2039) plants was normal up to the tetrad formation stage. The tapetal cells in the male-sterile anthers degenerated soon after tetrad formation, resulting in shriveled and degenerated

VIJAY A. DALVI; K UL B. SAXENA; I. A. Madrap; VIJAY K. RAVIKOTI

2008-01-01

59

Sexual identity and HIV: The male prostitute  

Microsoft Academic Search

We examined the relationships among sexual self?identity, sexual and drug use behaviors, and human immunodeficiency virus (HIV) infection among a sample of 224 male street prostitutes. Structured interviews were administered, and blood samples were collected and tested for HIV, syphilis, and hepatitis B. The sample included 17.9% homosexual, 46.4% heterosexual, and 35.7% bisexually identified men. Congruence between the prostitutes’ non?paid

Jacqueline Boles; Kirk W. Elifson

1994-01-01

60

Hybrid male sterility in rice controlled by interaction between divergent alleles of two adjacent genes  

Microsoft Academic Search

Sterility is common in hybrids between divergent populations, such as the indica and japonica subspecies of Asian cultivated rice (Oryza sativa). Although multiple loci for plant hybrid sterility have been identified, it remains unknown how alleles of the loci interact at the molecular level. Here we show that a locus for indica-japonica hybrid male sterility, Sa, comprises two adjacent genes,

Yunming Long; Lifeng Zhao; Baixiao Niu; Jing Su; Hao Wu; Yuanling Chen; Qunyu Zhang; Jingxin Guo; Chuxiong Zhuang; Mantong Mei; Jixing Xia; Lan Wang; Haibin Wu; Yao-Guang Liu

2008-01-01

61

Sexuality of male-to-female transsexuals.  

PubMed

Blanchard's (J Nerv Ment Dis 177:616-623, 1989) theory of autogynephilia suggests that male-to-female transsexuals can be categorized into different types based on their sexuality. Little previous research has compared the sexuality of male-to-female transsexuals to biological females. The present study examined 15 aspects of sexuality among a non-clinical sample of 234 transsexuals and 127 biological females, using either an online or a paper questionnaire. The results showed that, overall, transsexuals tended to place more importance on partner's physical attractiveness and reported higher scores on Blanchard's Core Autogynephilia Scale than biological females. In addition, transsexuals classified as autogynephilic scored significantly higher on Attraction to Feminine Males, Core Autogynephilia, Autogynephilic Interpersonal Fantasy, Fetishism, Preference for Younger Partners, Interest in Uncommitted Sex, Importance of Partner Physical Attractiveness, and Attraction to Transgender Fiction than other transsexuals and biological females. In accordance with Blanchard's theory, autogynephilia measures were positively correlated to Sexual Attraction to Females among transsexuals. In contrast to Blanchard's theory, however, those transsexuals classified as autogynephilic scored higher on average on Sexual Attraction to Males than those classified as non-autogynephilic, and no transsexuals classified as autogynephilic reported asexuality. PMID:18299976

Veale, Jaimie F; Clarke, Dave E; Lomax, Terri C

2008-02-26

62

Differences between Sexually Victimized and Nonsexually Victimized Male Adolescent Sexual Abusers: Developmental Antecedents and Behavioral Comparisons  

Microsoft Academic Search

This study compares sexually victimized and nonsexually victimized male adolescent sexual abusers on a number of variables. Self-report measures were administered to 325 male sexually abusive youth (average age 16) in six residential facilities in the Midwest, 55% of whom reported sexual victimization. The results indicate that the sexually victimized sexual abusers have more severe developmental antecedents (trauma, family characteristics,

David L. Burton; Kerry Jo Duty; George S. Leibowitz

2011-01-01

63

No evidence for faster male hybrid sterility in population crosses of an intertidal copepod ( Tigriopus californicus )  

Microsoft Academic Search

Two different forces are thought to contribute to the rapid accumulation of hybrid male sterility that has been observed in\\u000a many inter-specific crosses, namely the faster male and the dominance theories. For male heterogametic taxa, both faster male\\u000a and dominance would work in the same direction to cause the rapid evolution of male sterility; however, for taxa lacking differentiated\\u000a sex

Christopher S. Willett; PM Punta Morro; AB Abalone Cove; SC Santa Cruz; PES Pescadero; PLA Playa Altamira

2008-01-01

64

A chimaeric ribonuclease-inhibitor gene restores fertility to male sterile plants  

Microsoft Academic Search

Male fertility was restored to genetically engineered male sterile oilseed rape plants. Male sterile plants that express a chimaeric ribonuclease gene in the anther tapetal cell layer were crossed with male fertile plants that were transformed with a chimaeric tapetal-cell-specific ribonuclease-inhibitor gene. F1 progeny expressing both genes are restored to male fertility by the suppression of cytotoxic ribonuclease activity in

Celestina Mariani; Veronique Gossele; Marc De Beuckeleer; Marc De Block; Robert B. Goldberg; Willy De Greef; Jan Leemans

1992-01-01

65

Sterilizing effects of cobalt-60 and cesium-137 radiation on male sea lampreys  

USGS Publications Warehouse

Male spawning-run sea lampreys Petromyzon marinus were exposed to various doses of cobalt-60 or cesium-137 radiation in an attempt to sterilize them for use in a program for controlling sea lampreys through the release of sterile males. Males captured and irradiated during the early part of the upstream migration were not effectively sterilized at the doses tested. After irradiation, the sea lampreys were more susceptible to fungal infections by Saprolegnia sp., and many died without attempting to spawn. Males captured and irradiated during the middle and late parts of the spawning migration were effectively sterilized at a dose of 2,000 rads. However, some radiation-induced mortality was observed in males captured and irradiated during the middle part of the spawning migration. Radiation is not as effective as the chemosterilant bisazir for sterilizing male sea lampreys.

Hanson, L. H.

1990-01-01

66

Sexual functions and quality of life in women with tubal sterilization  

Microsoft Academic Search

The aim of this study was to evaluate the sexual functions and quality of life of women who have undergone tubal sterilization after tubal surgery. In all, 90 active premenopausal women, who had undergone tubal sterilization at least 1 year ago and been admitted to four different hospitals, were included in the study group. A total of 100 women at

M Gulum; E Yeni; M A Sahin; M Savas; H Ciftci

2010-01-01

67

Sterilization and Training for Normal Sexual Development: Human Rights and Obligations.  

ERIC Educational Resources Information Center

This paper notes the lack of attention given to the sexuality of people with intellectual disabilities in both the literature and service delivery (in Australia). It discusses sterilization issues (such as authority to give consent and the "best interest" concept) and recommends approaches less intrusive on individual rights than sterilization

Ashman, Adrian F.

1990-01-01

68

Effects of alcohol on male sexual responding  

Microsoft Academic Search

Sixteen adult males participated in a repeated measures design in which they served as their own control to determine the effects of various amounts of alcohol on: (1) their sexual arousal elicited by erotic motion-pictures, as measured by a penile transducer, (2) the ability to voluntarily inhibit their arousal to those same films in accordance with instructions, and (3) the

H. B. Rubin; Donald E. Henson

1976-01-01

69

Genetic basis of male sexual behavior  

Microsoft Academic Search

Male sexual behavior is increasingly the focus of genetic study in a variety of animals. Genetic analysis in the soil roundworm Caenorhabditis elegans and the fruit fly Drosophila melanogaster has lead to identification of genes and circuits that govern behaviors ranging from motivation and mate-searching to court- ship and copulation. Some worm and fly genes have counterparts with related functions

Scott W. Emmons; Jonathan Lipton

2003-01-01

70

Epidemiology and pathophysiology of male sexual dysfunction  

Microsoft Academic Search

Male sexual dysfunction (MSD) is a common disorder associated with a wide range of physical and psychological conditions. Erectile dysfunction, the most commonly studied aspect of MSD, is common and increases with age and with certain comorbid conditions. The pathophysiology of ED and other forms of MSD can be traced to a variety of etiologies, including vascular, hormonal, psychiatric, iatrogenic

J Kaminetsky

2008-01-01

71

Diverse germplasm to devleop male-sterile lines for hybrid breeding  

Technology Transfer Automated Retrieval System (TEKTRAN)

Hybrid rice breeding in the US has depended largely upon male-sterile lines originating in China or from other Asian sources. By contrast, the program in Arkansas has developed all of its male-sterile lines at Stuttgart,AR using germplasm accessions available in the USDA Rice Germplasm Collection st...

72

Efforts to chemically induce mutations for cytoplasmic male sterility in petunia. I. Field experiments  

Microsoft Academic Search

In the period 1980–1984 about 70000 selfed seeds of the petunia cultivar Blue Bedder were treated with the chemical mutagens ethidium bromide (EB) and ethylnitroso urea (ENU) with the intention to induce (new sources of) cytoplasmic male sterility (CMS). This work resulted in 27 stable male sterile MS-plants, all derived from the ENU-treatments.

A. M. VAN HARTEN; D. W. VAN DER SPEK; E. C. J. Bal

1985-01-01

73

Induction of male sterility in plants by a chimaeric ribonuclease gene  

Microsoft Academic Search

Chimaeric ribonuclease genes that are expressed in the anthers of transformed tobacco and oilseed rape plants were constructed. Chimaeric ribonuclease gene expression within the anther selectively destroys the tapetal cell layer that surrounds the pollen sac, prevents pollen formation, and leads to male sterility. These nuclear male sterility genes should facilitate the production of hybrid seed in various crop plants.

Celestina Mariani; Marc De Beuckeleer; Jessie Truettner; Jan Leemans; Robert B. Goldberg

1990-01-01

74

Mitochondrial DNA RFLP and genetical studies of cytoplasmic male sterility in the sunflower ( Helianthus annuus )  

Microsoft Academic Search

Fifteen sunflower (Helianthus annuus L.) cytoplasmic male-sterile, and a single male-fertile, cytotypes were studied by both mtDNA (mitochondrial DNA) restriction fragment length polymorphism (RFLP) and genetical analysis of male-fertility restoration patterns. It was found by multivariate analysis that the two methods of identification of cytoplasmic male sterility (CMS) should be of use in sunflower breeding programs. The RFLP study distinguished

D. Crouzillat; L. De La Canal; F. Vear; H. Serieys; G. Ledoigt

1994-01-01

75

Dimorphic male midshipman fish: reduced sexual selection or sexual selection for reduced characters?  

Microsoft Academic Search

In most taxa with male dimorphisms, some males are large in body size with exaggerated secondary sexual characters (exaggerated morph), whereas other males in the same population are small and have reduced secondary sexual characters (reduced morph). What selective pressures cause male dimorphisms? Reduced morphologies may result when a) some males develop a morphology that, in the absence of sexual

Jonathan S. F. Lee; Andrew H. Bass

2006-01-01

76

Early Sexual Experience Fails to Enhance Sexual Performance in Male Goats1  

Microsoft Academic Search

We studied the effects of early sexual experience on the adult sexual performance of male dairy goats. Seven postpubertal males were exposed to an estrous female on four occasions during their 1st yr of life. These males were housed with six additional males (controls) that received no early sexual ex- perience. As yearlings, the 13 males were individually exposed to

E. O. Price; R. Borgwardt; A. Orihuela

77

Inhibition of chalcone synthase Expression in Anthers of Raphanus sativus with Ogura Male Sterile Cytoplasm  

PubMed Central

Background and Aims Expression of the mitochondrial gene orf138 causes Ogura cytoplasmic male sterility (CMS) in Raphanus sativus, but little is known about the mechanism by which CMS takes place. A preliminary microarray experiment revealed that several nuclear genes concerned with flavonoid biosynthesis were inhibited in the male-sterile phenotype. In particular, a gene for one of the key enzymes for flavonoid biosynthesis, chalcone synthase (CHS), was strongly inhibited. A few reports have suggested that the inhibition of CHS causes nuclear-dependent male sterile expression; however, there do not appear to be any reports elucidating the effect of CHS on CMS expression. In this study, the expression patterns of the early genes in the flavonoid biosynthesis pathway, including CHS, were investigated in normal and male-sterile lines. Methods In order to determine the aberrant stage for CMS expression, the characteristics of male-sterile anthers are observed using light and transmission electron microscopy for several stages of flower buds. The expression of CHS and the other flavonoid biosynthetic genes in the anthers were compared between normal and male-sterile types using real time RT-PCR. Key Results Among the flavonoid biosynthetic genes analysed, the expression of CHS was strongly inhibited in the later stages of anther development in sterility cytoplasm; accumulation of putative naringenin derivatives was also inhibited. Conclusions These results show that flavonoids play an important role in the development of functional pollen, not only in nuclear-dependent male sterility, but also in CMS.

Yang, Soojung; Terachi, Toru; Yamagishi, Hiroshi

2008-01-01

78

The Relationship between Childhood Sexual Abuse and Adult Male Sexual Dysfunction.  

ERIC Educational Resources Information Center

|A study of 359 men who sought sexual dysfunction treatment found that childhood sexual abuse did not predict sexual dysfunction in the men. Unemployment was the only significant predictor of male sexual dysfunction. Differences between the sexual abuse experiences of the male victims compared to female victims (n=73) are discussed. (Author/CR)|

Sarwer, David B.; And Others

1997-01-01

79

Differences between Sexually Victimized and Nonsexually Victimized Male Adolescent Sexual Abusers: Developmental Antecedents and Behavioral Comparisons  

ERIC Educational Resources Information Center

|This study compares sexually victimized and nonsexually victimized male adolescent sexual abusers on a number of variables. Self-report measures were administered to 325 male sexually abusive youth (average age 16) in six residential facilities in the Midwest, 55% of whom reported sexual victimization. The results indicate that the sexually…

Burton, David L.; Duty, Kerry Jo; Leibowitz, George S.

2011-01-01

80

Differences between Sexually Victimized and Nonsexually Victimized Male Adolescent Sexual Abusers: Developmental Antecedents and Behavioral Comparisons  

ERIC Educational Resources Information Center

This study compares sexually victimized and nonsexually victimized male adolescent sexual abusers on a number of variables. Self-report measures were administered to 325 male sexually abusive youth (average age 16) in six residential facilities in the Midwest, 55% of whom reported sexual victimization. The results indicate that the sexually…

Burton, David L.; Duty, Kerry Jo; Leibowitz, George S.

2011-01-01

81

Scoring men: vasectomies and the totemic illusion of male sexuality in Oaxaca.  

PubMed

This paper discusses research on men's reproductive health and sexuality in Oaxaca, Mexico, and specifically why some men there choose to be sterilized. Men who opt for vasectomies do so after considering numerous cultural, historical, physiological, commercial, and other concerns. Men and women in Oaxaca negotiate certain cultural folk beliefs about supposed male sexual desires and practices before arriving at the decision to get the operation. Vasectomy as a method of birth control is chosen despite folk beliefs that take the form of a totemic illusion which treats male sexuality as naturalized, something fixed, and as entirely distinct from female sexuality. Among its many consequences, this totemic illusion serves to conceal inequalities in the sphere of reproductive health and sexuality in relation to contraception. PMID:16108204

Gutmann, Matthew C

2005-03-01

82

Comparative Transcriptomes Profiling of Photoperiod-sensitive Male Sterile Rice Nongken 58S During the Male Sterility Transition between Short-day and Long-day  

PubMed Central

Background Photoperiod-sensitive genic male sterile (PGMS) rice, Nongken 58S, was discovered in 1973. It has been widely used for the production of hybrid rice, and great achievements have been made in improving rice yields. However, the mechanism of the male sterility transition in PGMS rice remains to be determined. Results To investigate the transcriptome during the male sterility transition in PGMS rice, the transcriptome of Nongken 58S under short-day (SD) and long-day (LD) at the glume primordium differentiation and pistil/stamen primordium forming stages was compared. Seventy-three and 128 differentially expressed genes (DEGs) were identified at the glume primordium differentiation and pistil/stamen primordium forming stages, respectively. Five and 22 genes were markedly up-regulated (? 5-fold), and two and five genes were considerably down-regulated (? 5-fold) under SD during the male sterility transition. Gene ontology annotation and pathway analysis revealed that four biological processes and the circadian rhythms and the flowering pathways coordinately regulated the male sterility transition. Further quantitative PCR analysis demonstrated that the circadian rhythms of OsPRR1, OsPRR37, OsGI, Hd1, OsLHY and OsDof in leaves were obviously different between Nongken 58S and Nongken 58 under LD conditions. Moreover, both OsPRR37 and Hd1 in the inflorescence displayed differences between Nongken 58S and Nongken 58 under both LD and SD conditions. Conclusion The results presented here indicate that the transcriptome in Nongken 58S was significantly suppressed under LD conditions. Among these DEGs, the circadian rhythm and the flowering pathway were involved in the male sterility transition. Furthermore, these pathways were coordinately involved in the male sterility transition in PGMS rice.

2011-01-01

83

Genetic determination of male sterility in gynodioecious Silene nutans  

PubMed Central

Gynodioecy, the coexistence of female and hermaphrodite plants within a species, is often under nuclear–cytoplasmic sex determination, involving cytoplasmic male sterility (CMS) genes and nuclear restorers. A good knowledge of CMS and restorer polymorphism is essential for understanding the evolution and maintenance of gynodioecy, but reciprocal crossing studies remain scarce. Although mitochondrial diversity has been studied in a few gynodioecious species, the relationship between mitotype diversity and CMS status is poorly known. From a French sample of Silene nutans, a gynodioecious species whose sex determination remains unknown, we chose the four most divergent mitotypes that we had sampled at the cytochrome b gene and tested by reciprocal crosses whether they carry distinct CMS genes. We show that gynodioecy in S. nutans is under nuclear–cytoplasmic control, with at least two different CMSs and up to four restorers with epistatic interactions. Female occurrence and frequency were highly dependent on the mitotype, suggesting that the level of restoration varies greatly among CMSs. Two of the mitotypes, which have broad geographic distributions, represent different CMSs and are very unequally restored. We discuss the dynamics of gynodioecy at the large-scale meta-population level.

Garraud, C; Brachi, B; Dufay, M; Touzet, P; Shykoff, J A

2011-01-01

84

The contribution of the Y chromosome to hybrid male sterility in house mice.  

PubMed

Hybrid sterility in the heterogametic sex is a common feature of speciation in animals. In house mice, the contribution of the Mus musculus musculus X chromosome to hybrid male sterility is large. It is not known, however, whether F1 male sterility is caused by X-Y or X-autosome incompatibilities or a combination of both. We investigated the contribution of the M. musculus domesticus Y chromosome to hybrid male sterility in a cross between wild-derived strains in which males with a M. m. musculus X chromosome and M. m. domesticus Y chromosome are partially sterile, while males from the reciprocal cross are reproductively normal. We used eight X introgression lines to combine different X chromosome genotypes with different Y chromosomes on an F1 autosomal background, and we measured a suite of male reproductive traits. Reproductive deficits were observed in most F1 males, regardless of Y chromosome genotype. Nonetheless, we found evidence for a negative interaction between the M. m. domesticus Y and an interval on the M. m. musculus X that resulted in abnormal sperm morphology. Therefore, although F1 male sterility appears to be caused mainly by X-autosome incompatibilities, X-Y incompatibilities contribute to some aspects of sterility. PMID:22595240

Campbell, Polly; Good, Jeffrey M; Dean, Matthew D; Tucker, Priscilla K; Nachman, Michael W

2012-05-17

85

The Contribution of the Y Chromosome to Hybrid Male Sterility in House Mice  

PubMed Central

Hybrid sterility in the heterogametic sex is a common feature of speciation in animals. In house mice, the contribution of the Mus musculus musculus X chromosome to hybrid male sterility is large. It is not known, however, whether F1 male sterility is caused by X–Y or X-autosome incompatibilities or a combination of both. We investigated the contribution of the M. musculus domesticus Y chromosome to hybrid male sterility in a cross between wild-derived strains in which males with a M. m. musculus X chromosome and M. m. domesticus Y chromosome are partially sterile, while males from the reciprocal cross are reproductively normal. We used eight X introgression lines to combine different X chromosome genotypes with different Y chromosomes on an F1 autosomal background, and we measured a suite of male reproductive traits. Reproductive deficits were observed in most F1 males, regardless of Y chromosome genotype. Nonetheless, we found evidence for a negative interaction between the M. m. domesticus Y and an interval on the M. m. musculus X that resulted in abnormal sperm morphology. Therefore, although F1 male sterility appears to be caused mainly by X-autosome incompatibilities, X–Y incompatibilities contribute to some aspects of sterility.

Campbell, Polly; Good, Jeffrey M.; Dean, Matthew D.; Tucker, Priscilla K.; Nachman, Michael W.

2012-01-01

86

Respiration in Cells and Mitochondria of Male-Fertile and Male-Fertile and Male-Sterile Nicotiana spp. 1  

PubMed Central

Three cytoplasmic male-sterile Nicotiana cultivars together with corresponding male-fertile progenitors and restored lines were investigated in order to find possible correlations between respiratory characteristics and male sterility. Oxygen consumption measurements were performed on cells from suspension cultures as well as on mitochondria isolated from green leaves. Inhibitors, which have been reported to specifically block either the cytochrome (KCN) or the alternative (propyl gallate and sali-cylhydroxamic acid [SHAM] respiratory pathways, were used in order to measure the capacity and activity of the two pathways. One of the inhibitors, SHAM, was found unsuitable to measure the activity of the alternative pathway due to the lack of specificity of SHAM for this pathway. A great difference in the capacity of the alternative pathway was detected between the two types of cell materials tested. Mitochondria isolated from green leaves showed a capacity of the alternative pathway of 5 to 20% of total mitochondrial repiration, while the capacity of cells from suspension cultures generally ranged from 50 to 80%. In addition to this, in organello synthesis of mitochondrial proteins revealed differences between mitochondria isolated from green leaves and from cell suspensions. No correlation, however, could be found between respiratory characteristics and male sterility. Images Figure 1 Figure 2

Hakansson, Gunilla; Glimelius, Kristina; Bonnett, Howard T.

1990-01-01

87

The genetics of inviability and male sterility in hybrids between Anopheles gambiae and An. arabiensis.  

PubMed Central

Male hybrids between Anopheles gambiae and An. arabiensis suffer from hybrid sterility, and inviability effects are sometimes present as well. We examined the genetic basis of these reproductive barriers between the two species, using 21 microsatellite markers. Generally, recessive inviability effects were found on the X chromosome of gambiae that are incompatible with at least one factor on each arabiensis autosome. Inviability is complete when the gambiae and arabiensis inviability factors are hemi- or homozygous. Using a QTL mapping approach, regions that contribute to male hybrid sterility were also identified. The X chromosome has a disproportionately large effect on male hybrid sterility. Additionally, several moderate-to-large autosomal QTL were found in both species. The effect of these autosomal QTL is contingent upon the presence of an X chromosome from the other species. Substantial regions of the autosomes do not contribute markedly to male hybrid sterility. Finally, no evidence for epistatic interactions between conspecific sterility loci was found.

Slotman, M; Della Torre, A; Powell, J R

2004-01-01

88

Effects of childhood circumcision age on adult male sexual functions  

Microsoft Academic Search

The effects of childhood circumcision on male sexual function have been debated. However, there are no studies, to our knowledge, that assess the possible effects of childhood circumcision age on male sexual function. In an attempt to answer this question, we performed a prospective study to determine the possible relationship between circumcision age and male sexual function, using a validated

E Aydur; S Gungor; S T Ceyhan; L Taiimaz; I Baser

2007-01-01

89

Eurycoma longifolia increases sexual motivation in sexually naive male rats  

Microsoft Academic Search

The aim of this study is to provide evidence on the aphrodisiac property ofEurycoma longifolia Jack. An electric grid was used as an obstruction in the electrical copulation cage in order to determine how much an aversive\\u000a stimulus the sexually naive male rat for both the treated withE. longifolia Jack and control groups were willing to overcome to reach the

Hooi Hoon Ang; Meng Kwoon Sim

1998-01-01

90

Sexual competitiveness and compatibility between mass-reared sterile flies and wild populations of Anastrepha Ludens (Diptera: Tephritidae) from different regions in Mexico  

SciTech Connect

The mass-reared colony of Anastrepha ludens (Loew) currently used in Mexico for suppression of the Mexican fruit fly has been in use for over 10 years. Sterile flies are released into a wide range of environmental conditions as part of an integrated area-wide approach to suppress diverse populations of this pest in the Mexican Republic. This paper assesses the performance of the sterile flies interacting with wild populations from the different environments. We investigated the sexual compatibility and competitiveness of the sterile flies when competing with wild populations from 6 representatives Mexican states: Nuevo Leon, Tamaulipas, Sinaloa, Nayarit, Michoacan, and Chiapas. Results show that the males of the wild populations differed in the time to the onset and peak of sexual activity. Nevertheless, the index of sexual isolation (ISI) reflected sexual compatibility between the populations and the mass-reared strain, indicating that the sterile individuals mate satisfactorily with the wild populations from the 6 states. The male relative performance index (MRPI) showed that the sterile male is as effective in copulating as the wild males. The female relative performance index (FRPI) reflected a general tendency for wild females to copulate in greater proportion than the sterile females, except for the strains from Tamaulipas and Chiapas. In general, the lower participation of the sterile females in copulation increases the possibilities of sterile males to mate with wild females. The relative sterility index (RSI) showed that the acceptance by wild females of the sterile males (25-55%) was similar to that of wild males. Females of the Chiapas strain showed the lowest acceptance of sterile males. Finally, the results obtained in the Fried test (which measures induced sterility in eggs) showed a competitiveness coefficient ranging from 0.2 to 0.5. This suggests that sterile males successfully compete and are compatible with flies from different geographic origins. (author) [Spanish] La colonia actualmente usada para controlar la mosca mexicana de la fruta, Anastrepha ludens (Loew), en Mexico tiene mas de 10 anos en cria masiva. Los insectos esteriles son liberados en una gran variedad de condiciones ambientales como parte de un control integrado para suprimir diversas poblaciones de esta plaga dentro de la Republica Mexicana. El objetivo de este documento esta dirigido a revisar el desempeno de las moscas esteriles frente a poblaciones silvestres procedentes de diferentes ambientes y para esto se realizaron comparaciones de compatibilidad y competitividad sexual de las moscas esteriles contra poblaciones silvestres de seis estados representativos de la Republica Mexicana: Nuevo Leon, Tamaulipas, Sinaloa, Nayarit, Michoacan y Chiapas. Los resultados obtenidos manifiestan diferencias en el horario de inicio de llamado y mayor actividad sexual del macho entre las moscas provenientes de cada estado. Sin embargo el indice de aislamiento (ISI) reflejo compatibilidad sexual entre la cepa de laboratorio y todas las poblaciones analizadas, indicando que los individuos esteriles pueden aparearse satisfactoriamente con las poblaciones silvestres de los seis estados. El indice de efectividad de apareamiento del macho (MRPI) reflejo de manera global que los machos esteriles son tan efectivos para copular como los silvestres. El indice de efectividad de apareamiento de la hembra (FRPI) reflejo que en la mayoria de los estados las hembras silvestres copularon en mayor proporcion que las hembras esteriles, excepto para las poblaciones de Tamaulipas y Chiapas. En general, la baja participacion de las hembras esteriles en el campo permitio al macho esteril ampliar su probabilidad de apareamiento con las hembras silvestres. En cuanto al indice de esterilidad relativa (RSI), observamos que la aceptacion de las hembras silvestres al macho esteril (25-55%) fue similar a la de los machos silvestres. Las hembras de la poblacion de Chiapas registro la menor aceptacion. Finalmente, los resultados obtenidos en la prueba de Fried, la cual determi

Orozco-Davila, D.; Hernandez, R.; Meza, S.; Dominguez, J. [Programa Moscamed Moscafrut-Desarrollo de Metodos, Central Poniente No. 14 altos-Esq. 2a Avenida Sur. CP 30700 Tapachula, Chiapas (Mexico)

2007-03-15

91

Photoperiod-sensitive cytoplasmic male sterility in wheat with Aegilops crassa cytoplasm  

Microsoft Academic Search

Triticum aestivum cv. Norin 26 with Aegilops crassa, Ae. juvenalis or Ae. vavilovii cytoplasm (all D2 type) has been studied relative to its photoperiodic response of male sterility and fertility restoration patterns. Alloplasmic lines of ‘Norin 26’ with a D2 type cytoplasm showed almost complete male sterility under long-day conditions (=15 h), but high male fertility under short-day conditions (=14.5

Koji Murai; Koichiro Tsunewaki

1993-01-01

92

Cytoplasmic Male Sterility Contributes to Hybrid Incompatibility Between Subspecies of Arabidopsis lyrata.  

PubMed

In crosses between evolutionarily diverged populations, genomic incompatibilities may result in sterile hybrids, indicating evolution of reproductive isolation. In several plant families, crosses within a population can also lead to male sterile progeny because of conflict between the maternally and biparentally inherited genomes. We examined hybrid fertility between subspecies of the perennial outcrossing self-incompatible Lyrate rockcress (Arabidopsis lyrata) in large reciprocal F2 progenies and three generations of backcrosses. In one of the reciprocal F2 progenies, almost one-fourth of the plants were male-sterile. Correspondingly, almost one-half of the plants in one of the four reciprocal backcross progenies expressed male sterility. In an additional four independent F2 and backcross families, three segregated male sterility. The observed asymmetrical hybrid incompatibility is attributable to male sterility factors in one cytoplasm, for which the other population lacks effective fertility restorers. Genotyping of 96 molecular markers and quantitative trait locus mapping revealed that only 60% of the plants having the male sterile cytoplasm and lacking the corresponding restorers were phenotypically male-sterile. Genotyping data showed that there is only one restorer locus, which mapped to a 600-kb interval at the top of chromosome 2 in a region containing a cluster of pentatricopeptide repeat genes. Male fertility showed no trade-off with seed production. We discuss the role of cytoplasm and genomic conflict in incipient speciation and conclude that cytoplasmic male sterility-lowering hybrid fitness is a transient effect with limited potential to form permanent reproductive barriers between diverged populations of hermaphrodite self-incompatible species. PMID:23935000

Aalto, Esa A; Koelewijn, Hans-Peter; Savolainen, Outi

2013-10-03

93

Cytoplasmic Male Sterility Contributes to Hybrid Incompatibility Between Subspecies of Arabidopsis lyrata  

PubMed Central

In crosses between evolutionarily diverged populations, genomic incompatibilities may result in sterile hybrids, indicating evolution of reproductive isolation. In several plant families, crosses within a population can also lead to male sterile progeny because of conflict between the maternally and biparentally inherited genomes. We examined hybrid fertility between subspecies of the perennial outcrossing self-incompatible Lyrate rockcress (Arabidopsis lyrata) in large reciprocal F2 progenies and three generations of backcrosses. In one of the reciprocal F2 progenies, almost one-fourth of the plants were male-sterile. Correspondingly, almost one-half of the plants in one of the four reciprocal backcross progenies expressed male sterility. In an additional four independent F2 and backcross families, three segregated male sterility. The observed asymmetrical hybrid incompatibility is attributable to male sterility factors in one cytoplasm, for which the other population lacks effective fertility restorers. Genotyping of 96 molecular markers and quantitative trait locus mapping revealed that only 60% of the plants having the male sterile cytoplasm and lacking the corresponding restorers were phenotypically male-sterile. Genotyping data showed that there is only one restorer locus, which mapped to a 600-kb interval at the top of chromosome 2 in a region containing a cluster of pentatricopeptide repeat genes. Male fertility showed no trade-off with seed production. We discuss the role of cytoplasm and genomic conflict in incipient speciation and conclude that cytoplasmic male sterility–lowering hybrid fitness is a transient effect with limited potential to form permanent reproductive barriers between diverged populations of hermaphrodite self-incompatible species.

Aalto, Esa A.; Koelewijn, Hans-Peter; Savolainen, Outi

2013-01-01

94

Early events in speciation: polymorphism for hybrid male sterility in Drosophila.  

PubMed

Capturing the process of speciation early enough to determine the initial genetic causes of reproductive isolation remains a major challenge in evolutionary biology. We have found, to our knowledge, the first example of substantial intraspecific polymorphism for genetic factors contributing to hybrid male sterility. Specifically, we show that the occurrence of hybrid male sterility in crosses between Drosophila mojavensis and its sister species, Drosophila arizonae, is controlled by factors present at different frequencies in different populations of D. mojavensis. In addition, we show that hybrid male sterility is a complex phenotype; some hybrid males with motile sperm still cannot sire offspring. Because male sterility factors in hybrids between these species are not yet fixed within D. mojavensis, this system provides an invaluable opportunity to characterize the genetics of reproductive isolation at an early stage. PMID:15184657

Reed, Laura K; Markow, Therese A

2004-06-07

95

The control of male sexual responses.  

PubMed

Male sexual responses are reflexes mediated by the spinal cord and modulated by neural circuitries involving both the peripheral and central nervous system. While the brain interact with the reflexes to allow perception of sexual sensations and to exert excitatory or inhibitory influences, penile reflexes can occur despite complete transections of the spinal cord, as demonstrated by the reviewed animal studies on spinalization and human studies on spinal cord injury. Neurophysiological and neuropharmacological substrates of the male sexual responses will be discussed in this review, starting with the spinal mediation of erection and its underlying mechanism with nitric oxide (NO), followed by the description of the ejaculation process, its neural mediation and its coordination by the spinal generator of ejaculation (SGE), followed by the occurrence of climax as a multisegmental sympathetic reflex discharge. Brain modulation of these reflexes will be discussed through neurophysiological evidence involving structures such as the medial preoptic area of hypothalamus (MPOA), the paraventricular nucleus (PVN), the periaqueductal gray (PAG), and the nucleus para-gigantocellularis (nPGI), and through neuropharmacological evidence involving neurotransmitters such as serotonin (5-HT), dopamine and oxytocin. The pharmacological developments based on these mechanisms to treat male sexual dysfunctions will complete this review, including phosphodiesterase (PDE-5) inhibitors and intracavernous injections (ICI) for the treatment of erectile dysfunctions (ED), selective serotonin reuptake inhibitor (SSRI) for the treatment of premature ejaculation, and cholinesterase inhibitors as well as alpha adrenergic drugs for the treatment of anejaculation and retrograde ejaculation. Evidence from spinal cord injured studies will be highlighted upon each step. PMID:23360268

Courtois, Frédérique; Carrier, Serge; Charvier, Kathleen; Guertin, Pierre A; Journel, Nicolas Morel

2013-01-01

96

A new method for hybrid seed production based on cytoplasmic male sterility combined with a lethal gene and a female sterile pollenizer in Capsicum annuum L  

Microsoft Academic Search

A new improved method for hybrid seed production was successfully tested. This method is based on using a cytoplasmic male sterile line possessing a lethal gene with action that can be easily inhibited and a female sterile pollenizer. The lethal gene ensures 100% purity of the F1 crop. The female sterile pollenizer provides a permanent abundant flowering with excess of

S. Daskalov; L. Mihailov

1988-01-01

97

Genetics of Reproductive Isolation in the Drosophila simulans Clade: Complex Epistasis Underlying Hybrid Male Sterility  

Microsoft Academic Search

We have analyzed the sterility associated with introgressions of the distal one-fourth of the X chrc- mosome from either Drosophila mauritiana or Drosophila sechellia into the genome of Drosophila simu- lans using a series of visible and DNA markers. Because in Drosophila hybrids, male sterility is usually complete and is often tightly linked with each of several markers used in

Eric L. Cabot; Andrew W. Davis; Norman A. Johnson; Chung-I Wu

98

Husband-Wife Communication, Wife's Employment, and the Decision for Male or Female Sterilization.  

ERIC Educational Resources Information Center

Examined relationships between perceptions of marital communication and the choice of male or female sterilization in 313 couples. The wife's perception of marital communication was negatively related to the tendency for the couple to choose female sterilization, conditional on female labor force participation. Communication questions are…

Bean, Frank D.; And Others

1983-01-01

99

Fluctuating asymmetry, metabolic rate and sexual selection in human males  

Microsoft Academic Search

Fluctuating asymmetry (FA), a measure of developmental stability, may be important in human sexual selection, that is in mate choice and male-male competition. It is shown that in males (but not in females) resting metabolic rate (RMR) is positively related to FA. This is explained in terms of the balanced energy equation of males. Sexual selection for large body size

J. T. Manning; K. Koukourakis; D. A. Brodie

1997-01-01

100

Sexual Assault of Male Inmates: Prevention, Identification, and Intervention  

Microsoft Academic Search

This article reviews available literature on male inmate sexual assault and discusses the legal, moral, and practical reasons why correctional personnel should work to prevent instances of sexual assault and sexual pressure from occurring in prisons and jails. Typical offender characteristics and motivations are presented. Victim characteristics and common psychological reactions to prison sexual assaults are highlighted also. Lastly, specific

Thomas J. Fagan; Deborah Wennerstrom; Jeanne Miller

1996-01-01

101

The role of orgasm in male and female sexual enjoyment  

Microsoft Academic Search

Several researchers have suggested that orgasm plays a minimal role in female subjective sexual satisfaction. No data exist on this issue for males and the data for females are based on very global indices of sexual satisfaction. The purposes of this study were to investigate (a) the relationships between orgasm consistency and sexual enjoyment in both males and females, (b)

Caroline K. Waterman; Emil J. Chiauzzi

1982-01-01

102

Pavlovian Conditioning of Sexual Interests in Human Males  

Microsoft Academic Search

Pavlovian conditioning of the human male sexual response may be involved in the ontogenetic development of sexual interests and may be responsible for individual differences. We attempted to demonstrate Pavlovian conditioning of sexual interests in a nonclinical sample of adult males. Ten participants were exposed to 11 pairings of a slide of a moderately attractive, partially nude female adult (TARGET)

Martin L. Lalumiere; Vernon L. Quinsey

1998-01-01

103

A Novel and Reversible Male Sterility System Using Targeted Inactivation of Glutamine Synthetase and Doubled Haploidy  

Microsoft Academic Search

F1 hybrid seeds are produced by controlled hybridization of homozygous inbred lines. Male sterility avoids tedious emasculation\\u000a procedures of female parental plants but must be reversible easily in order to propagate and maintain the male-sterile lines.\\u000a Doubled haploid plants provide complete homozygosity and therefore may be used as parental lines to breed F1 hybrids. An environment-friendly F1 hybrid breeding technology

A. Ribarits; A. N. K. Mamun; S. Li; T. Resch; M. Fiers; E. Heberle-Bors; C.-M. Liu; A. Touraev

104

Autosomal Translocations Causing Male Sterility and Viable Aneuploidy in the Mouse  

Microsoft Academic Search

In previous experiments on the induction of translocations in the mouse tests were usually confined to the sons of treated animals. In the present experiment daughters of irradiated males were studied, with a view to finding the frequency of X-linked translocations and of autosomal aberrations causing male sterility. The treated males were given 600 rad X-rays to the hind part

Mary F. Lyon; R. Meredith

1966-01-01

105

Eurycoma longifolia increases sexual motivation in sexually naive male rats.  

PubMed

The aim of this study is to provide evidence on the aphrodisiac property of Eurycoma longifolia Jack. An electric grid was used as an obstruction in the electrical copulation cage in order to determine how much an aversive stimulus the sexually naive male rat for both the treated with E. longifolia Jack and control groups were willing to overcome to reach the estrous receptive female in the goal cage. The intensity of the grid current was maintained at 0.12 mA and this was the intensity in which the male rats in the control group failed to crossover to reach the goal cage. Results showed that E. longifolia Jack continued to enhance and also maintain a high level of both the total number of successful crossovers, mountings, intromissions and ejaculations during the 9-12th week observation period. In conclusion, these results further enhanced and strengthened the aphrodisiac property of E. longifolia Jack. PMID:9868556

Ang, H H; Sim, M K

1998-12-01

106

Two recessive genes controlling thermophotoperiod-sensitive male sterility in wheat  

Microsoft Academic Search

Male sterility of wheat-breeding line 337S (Triticum aestivum L.) is sensitive to both short day-length\\/low temperature and long day-length\\/high temperature. 337S was crossed with the\\u000a common wheat variety, Huamai No. 8 and the F1 was highly fertile. The F2 population segregated in a 15:1 ratio for fertility\\/sterility in 243 individuals under long day-length\\/high-temperature.\\u000a The two thermophotoperiod-responsive male sterile genes were

R. X. Guo; D. F. Sun; Z. B. Tan; D. F. Rong; C. D. Li

2006-01-01

107

Pilot field trials with Aedes albopictus irradiated sterile males in Italian urban areas.  

PubMed

The pilot field studies here presented are part of a long-term research program aimed to develop a cost-effective sterile insect technique (SIT) methodology to suppress Aedes albopictus (Skuse) populations. Aedes albopictus is a mosquito species mainly developing in man-made containers and with an island-like urban and suburban distribution. These two features make the application of the sterile insect technique a possible control strategy. Five trials have been performed in three small towns from 2005 to 2009 (Emilia-Romagna region, northern Italy). Reared male pupae, sexed by a sieving technique allowing the recovery of approximately 26-29% of males, were exposed to gamma rays and immediately released in the field. Adult population density was estimated based on a weekly monitoring of egg density in the ovitraps, whereas induced sterility was estimated by measuring the hatching percentage of weekly collected eggs in SIT and control areas. Results showed that sterile males released at the rate of 896-1,590 males/ha/wk induced a significant sterility level in the local population. In addition, when the sterility level achieved values in the range of 70-80%, a similar reduction also was found for the egg density in the ovitraps. We could estimate that the minimum egg sterility value of 81% should be maintained to obtain suppression of the local population. Immigration of mated females was not a main issue in the small villages where trials have been run. PMID:23540120

Bellini, R; Medici, A; Puggioli, A; Balestrino, F; Carrieri, M

2013-03-01

108

Amyloid beta precursor protein regulates male sexual behavior.  

PubMed

Sexual behavior is variable between individuals, ranging from celibacy to sexual addictions. Within normal populations of individual men, ranging from young to middle aged, testosterone levels do not correlate with libido. To study the genetic mechanisms that contribute to individual differences in male sexual behavior, we used hybrid B6D2F1 male mice, which are a cross between two common inbred strains (C57BL/6J and DBA/2J). Unlike most laboratory rodent species in which male sexual behavior is highly dependent upon gonadal steroids, sexual behavior in a large proportion of these hybrid male mice after castration is independent of gonadal steroid hormones and their receptors; thus, we have the ability to discover novel genes involved in this behavior. Gene expression arrays, validation of gene candidates, and transgenic mice that overexpress one of the genes of interest were used to reveal genes involved in maintenance of male sexual behavior. Several genes related to neuroprotection and neurodegeneration were differentially expressed in the hypothalamus of males that continued to mate after castration. Male mice overexpressing the human form of one of these candidate genes, amyloid beta precursor protein (APP), displayed enhanced sexual behavior before castration and maintained sexual activity for a longer duration after castration compared with controls. Our results reveal a novel and unexpected relationship between APP and male sexual behavior. We speculate that declining APP during normal aging in males may contribute to the loss of sexual function. PMID:20668181

Park, Jin Ho; Bonthius, Paul J; Tsai, Houng-Wei; Bekiranov, Stefan; Rissman, Emilie F

2010-07-28

109

Therapy for Male couples Experiencing Relationship Problems and Sexual Problems  

Microsoft Academic Search

This article examines four issues that need to be explored by the therapist as possible causes of stress for a male couple: stereotypic male roles, stereotypic sexual roles, homophobia, which includes the “coming out” process, and sexual dysfunctions. These issues can cause anxiety and stress, which may in turn cause relationship problems for a male couple. The role of the

Kenneth D. George; Andrew E. Behrendt

1987-01-01

110

Stranger and Acquaintance Sexual Assault of Adult Males  

ERIC Educational Resources Information Center

|This study examined victim and assault characteristics and the nature and extent of coercion, violence, and physical injuries among adult male victims of sexual assaults. Client records of three groups presenting to a sexual assault care center were included: males assaulted by a stranger (n = 64), males assaulted by an acquaintance (n = 81), and…

Stermac, Lana; del Bove, Giannetta; Addison, Mary

2004-01-01

111

Sexual Agreements among Gay Male Couples  

PubMed Central

Many gay male couples make agreements about whether or not to permit sex with outside partners, yet little is known about the development and maintenance of these agreements, their impact on relationships, and whether they are an effective HIV prevention strategy. Using semi-structured, qualitative interviews, 39 gay male couples were asked about their sexual agreements and about other relationship dynamics that might affect their agreements. Analysis revealed a wide range of agreement types, all of which are presented along a continuum rather than as discrete categories. For couples with open agreements, most placed rules or conditions limiting when, where, how often, and with whom outside sex was permitted. Although motivations for having agreements varied, HIV prevention did not rank as a primary factor for any couple. Most couples had congruous agreements; however, a small number reported discrepancies which may increase HIV transmission risk. How couples handled breaks in their agreements also varied, depending on what condition was broken, whether it was disclosed, and the partner's reaction. Additional results include differences in agreement type and motivations for having an agreement based on couple serostatus. Overall, agreements benefited couples by providing boundaries for the relationship, supporting a non-heteronormative identity, and fulfilling the sexual needs of the couple. Future prevention efforts involving gay couples must address the range of agreement types and the meanings couples ascribe to them, in addition to tempering safety messages with the relationship issues that are important to and faced by gay couples.

Hoff, Colleen H.; Beougher, Sean C.

2009-01-01

112

Nitric oxide is involved in male sexual behavior of rats  

Microsoft Academic Search

In male rats, whether sexually experienced or sexually naive, the intraperitoneal administration of l-arginine (the natural substrate for nitric oxide synthase) (10, 25, 50 mg\\/kg) both increased the percentage of copulating in sexually naive rats and improved the indexes of sexual performance in sexually experienced rats, whereas the intraperitoneal administration of NG-nitro-l-arginine methyl ester (L-NAME) (a potent inhibitor of nitric

Augusta Benelli; Alfio Bertolini; Rosanna Poggioli; Elena Cavazzuti; Laura Calzà; Luciana Giardino; Rossana Arletti

1995-01-01

113

The effect of interval tubal sterilization on sexual interest and pleasure  

Microsoft Academic Search

OBJECTIVE:To determine if interval tubal sterilization leads to a change in female sexual interest or pleasure and to identify predictors of a positive or negative effect.METHODS:Our study population comprised 4576 women enrolled in a prospective, multicenter cohort study between 1978 and 1983. Potential demographic, clinical, and surgical predictors of sexual outcome were tested for significant variation from the overall pattern

Caroline Costello; Susan D Hillis; Polly A Marchbanks; Denise J Jamieson; Herbert B Peterson

2002-01-01

114

Genetic diagnosis of cytoplasmic male sterile cybrid plants of rice  

Microsoft Academic Search

Twelve Japanese rice cultivars were converted to CMS by asymmetric protoplast fusion with MTC-5A, the cytoplasm of which was derived from an indica rice, Chinsurah Boro II. With the exception of the cybrids that had a nucleus from Hoshiyutaka, most of these cybrid plants were sterile. The unique sequence downstream from the mitochondrial atp6 of MTC-5A was specifically amplified in

H. Akagi; A. Nakamura; R. Sawada; M. Oka; T. Fujimura

1995-01-01

115

Sexual selection favours male parental care, when females can choose  

PubMed Central

Explaining the evolution of male care has proved difficult. Recent theory predicts that female promiscuity and sexual selection on males inherently disfavour male care. In sharp contrast to these expectations, male-only care is often found in species with high extra-pair paternity and striking variation in mating success, where current theory predicts female-only care. Using a model that examines the coevolution of male care, female care and female choice; I show that inter-sexual selection can drive the evolution of male care when females are able to bias mating or paternity towards parental males. Surprisingly, female choice for parental males allows male care to evolve despite low relatedness between the male and the offspring in his care. These results imply that predicting how sexual selection affects parental care evolution will require further understanding of why females, in many species, either do not prefer or cannot favour males that provide care.

Alonzo, Suzanne H.

2012-01-01

116

REGISTRATION OF TWO CYTOPLASMIC MALE-STERILE AND EIGHT FERTILITY RESTORATION SUNFLOWER GENETIC STOCKS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Male-sterile plants were identified in the wild H. annuus L. accessions PI 413178 and PI 413180, and maintained by backcrossing with the inbred line HA 89. Male-fertile progenies from crosses between cms plants of the two PIs and 12 USDA inbred lines indicated the presence of fertility restoration g...

117

Genetically Marked Male Sterile Genes and Hybrid Seed Production. Final Report on Phase 2.  

National Technical Information Service (NTIS)

The project was intended to make practical the use of nuclear male sterile (ms) genes in hybrid seed production by linking a marker gene to the male fertile allele of the ms gene and selecting for the segregating ms seed by discarding segregants showing t...

A. Morgan

1991-01-01

118

Meiotic sex chromosome inactivation is disrupted in sterile hybrid male house mice.  

PubMed

In male mammals, the X and Y chromosomes are transcriptionally silenced in primary spermatocytes by meiotic sex chromosome inactivation (MSCI) and remain repressed for the duration of spermatogenesis. Here, we test the longstanding hypothesis that disrupted MSCI might contribute to the preferential sterility of heterogametic hybrid males. We studied a cross between wild-derived inbred strains of Mus musculus musculus and M. m. domesticus in which sterility is asymmetric: F1 males with a M. m. musculus mother are sterile or nearly so while F1 males with a M. m. domesticus mother are normal. In previous work, we discovered widespread overexpression of X-linked genes in the testes of sterile but not fertile F1 males. Here, we ask whether this overexpression is specifically a result of disrupted MSCI. To do this, we isolated cells from different stages of spermatogenesis and measured the expression of several genes using quantitative PCR. We found that X overexpression in sterile F1 primary spermatocytes is coincident with the onset of MSCI and persists in postmeiotic spermatids. Using a series of recombinant X genotypes, we then asked whether X overexpression in hybrids is controlled by cis-acting loci across the X chromosome. We found that it is not. Instead, one large interval in the proximal portion of the M. m. musculus X chromosome is associated with both overexpression and the severity of sterility phenotypes in hybrids. These results demonstrate a strong association between X-linked hybrid male sterility and disruption of MSCI and suggest that trans-acting loci on the X are important for the transcriptional regulation of the X chromosome during spermatogenesis. PMID:23307891

Campbell, Polly; Good, Jeffrey M; Nachman, Michael W

2013-01-10

119

Male victims of sexual assault: phenomenology, psychology, physiology.  

PubMed

Myths, stereotypes, and unfounded beliefs about male sexuality, in particular male homosexuality, are widespread in legal and medical communities, as well as among agencies providing services to sexual assault victims. These include perceptions that men in noninstitutionalized settings are rarely sexually assaulted, that male victims are responsible for their assaults, that male sexual assault victims are less traumatized by the experience than their female counterparts, and that ejaculation is an indicator of a positive erotic experience. As a result of the prevalence of such beliefs, there is an underreporting of sexual assaults by male victims; a lack of appropriate services for male victims; and, effectively, no legal redress for male sexual assault victims. By comparison, male sexual assault victims have fewer resources and greater stigma than do female sexual assault victims. Many male victims, either because of physiological effects of anal rape or direct stimulation by their assailants, have an erection, ejaculate, or both during the assault. This is incorrectly understood by assailant, victim, the justice system, and the medical community as signifying consent by the victim. Studies of male sexual physiology suggest that involuntary erections or ejaculations can occur in the context of nonconsensual, receptive anal sex. Erections and ejaculations are only partially under voluntary control and are known to occur during times of extreme duress in the absence of sexual pleasure. Particularly within the criminal justice system, this misconception, in addition to other unfounded beliefs, has made the courts unwilling to provide legal remedy to male victims of sexual assault, especially when the victim experienced an erection or an ejaculation during the assault. Attorneys and forensic psychiatrists must be better informed about the physiology of these phenomena to formulate evidence-based opinions. PMID:21653264

Bullock, Clayton M; Beckson, Mace

2011-01-01

120

Males' evolutionary responses to experimental removal of sexual selection  

Microsoft Academic Search

We evaluated the in£uence of pre- and post-copulatory sexual selection upon male reproductive traits in a naturally promiscuous species, Drosophila melanogaster. Sexual selection was removed in two replicate populations through enforced monogamous mating with random mate assignment or retained in polyandrous controls. Monogamous mating eliminates all opportunities for mate competition, mate discrimination, sperm competition, cryptic female choice and, hence, sexual

Scott Pitnick; Gary T. Miller; Jennifer Reagan; Brett Holland

2001-01-01

121

Sexual ornamentation, androgens and papillomatosis in male roach (Rutilus rutilus)  

Microsoft Academic Search

According to the immunocompetence handicap hypothesis, males with attractive sexual ornamentation are more handicapped than their less ornamented rivals because of the immunosuppressive androgens required for the production of secondary sexual characters. Here we studied the predictions of the hypothesis in a wild cyprinid fish, the roach (Rutilus rutilus). We assayed (1) sexual ornamentation (breeding tubercles), (2) circulating androgens (11-ketotestosterone

Raine Kortet; Anssi Vainikka; Markus J. Rantala; Ilmari Jokinen; Jouni Taskinen

2003-01-01

122

Sexual health knowledge of male and female Latino immigrants.  

PubMed

To explore sexual health knowledge among Latino immigrants in a Southern U.S. city, we conducted 20 qualitative interviews, (10 Women and 10 Men). We explored knowledge and factors associated with sexual health among male and female Latino immigrants in a Southern U.S. city experiencing a major growth of Latino immigrants in the past 10 years. Both genders demonstrated limited knowledge of Human Papillomavirus (HPV) and risks of sexually transmitted infection (STI) acquisition. Neither gender perceived that they could have an asymptomatic STI, including HPV. Gender differences exist in sexual behaviors and perceptions of STI risk. Females indicated that female Latinas tend to have older sexual initiation age, fewer lifetime sexual partners and more pro-active sexual health than did Latinos when referring to Latino males. Consequently, male and female Latino immigrants could benefit from culturally relevant programs to alleviate STI disparities. PMID:22273804

Seal, Paula S; Garcés-Palacio, Isabel C; Halanych, Jewell H; Scarinci, Isabel C

2012-08-01

123

Correlates of Pre-College Males' Sexual Aggression  

Microsoft Academic Search

Current literature suggests that the causes of sexual aggression toward women lie in the fabric of a patriarchal society. The acceptance by males of negative, stereotypical and harmful myths about women, traditional sex-role stereotypes, the acceptance of interpersonal violence and the objectification of women foster an environment where sexual aggression can flourish. This paper explores several factors associated with male

Brenda L. Vogel

2000-01-01

124

Predictors of Sexual Aggression among Male Juvenile Offenders  

ERIC Educational Resources Information Center

The purpose of this study was to conduct a longitudinal examination of predictors of sexual aggression among male juvenile offenders. Four hundred and four adolescent males between the ages of 14 and 17 years were recruited from juvenile probation offices to take part in a prospective study of substance use and sexual risk. At baseline,…

Yeater, Elizabeth A.; Lenberg, Kathryn L.; Bryan, Angela D.

2012-01-01

125

Sexual interest, activity, and satisfaction among male nursing home residents  

Microsoft Academic Search

Structured interviews were conducted with all male residents (n = 116) of a Veterans Affairs Nursing Home to gather information on sexual interest, preference, activity levels, satisfaction, and distress. We excluded males with severe cognitive impairment, leaving a sample of 61. Of these, 30 had partners. Sexual interest was significantly higher among those with partners (p = 0.014), although those

Thomas Mulligan; Robert F. Palguta

1991-01-01

126

No evidence for local adaptation between cytoplasmic male sterility and nuclear restorer genes in the gynodioecious species Thymus vulgaris L  

Microsoft Academic Search

In Thymus vulgaris L., sex determination involves both the nuclear and the cytoplasmic genomes: the cytoplasm is responsible for male sterility (the female phenotype) whereas specific nuclear genes may restore male fertility (the hermaphrodite phenotype). The evolutionary dynamics of cytoplasmic male-sterility genes and nuclear restorer genes represents a coevolutionary conflict. Here we draw a parallel between this conflict and the

L. GIGORD; C Lavigne; J. A. SHYKOFF; A Atlan

1998-01-01

127

Inheritance of photoperiod sensitive genic male sterility and breeding of photoperiod sensitive genic male-sterile lines in rice (Oryza sativa L.) through anther culture  

Microsoft Academic Search

The fertility segregations of F1, F2, BCF1 descended from crosses between PSGMR and japonica varieties, and F1's anther cultured homozygous diploid pollen plant populations (H2) were studied to reveal the genetic mechanism of photoperiod sensitive genic male sterility in PSGMR under natural daylight\\u000a length at Shanghai. Rate of bagged seed-setting was used as an indicator of fertility. Fifteen F1 showed

Yang Zhuping

1997-01-01

128

Male sterility in triploid dandelions: asexual females vs asexual hermaphrodites  

Microsoft Academic Search

Male reproductive output, pollen in plants and sperm in animals has been shown to constitute a substantial cost for many organisms. In parthenogenetic hermaphrodites, selection is therefore expected to reduce the allocation of resources to male reproductive output. However, sustained production of pollen or sperm has been observed in numerous asexual hermaphrodites. We studied the widespread production of pollen by

P G Meirmans; P H Van Tienderen

2006-01-01

129

The male sterility locus ms3 is present in a fertility controlling gene cluster in soybean.  

PubMed

Soybean [Glycine max (L.) Merr.] is self-pollinated. To produce large quantities of hybrid seed, insect-mediated cross-pollination is necessary. An efficient nuclear male-sterile system for hybrid seed production would benefit from molecular and/or phenotypic markers linked to male fertility/sterility loci to facilitate early identification of phenotypes. Nuclear male-sterile, female-fertile ms3 mutant is a single recessive gene and displays high outcrossed seed set with pollinators. Our objective was to map the ms3 locus. A segregating population of 150 F(2) plants from Minsoy (PI 27890) x T284H, Ms3ms3 (A00-68), was screened with 231 simple sequence repeat markers. The ms3 locus mapped to molecular linkage group (MLG) D1b (Gm02) and is flanked by markers Satt157 and Satt542, with a distance of 3.7 and 12.3 cM, respectively. Female-partial sterile-1 (Fsp1) and the Midwest Oilseed male-sterile (msMOS) mutants previously were located on MLG D1b. msMOS and Fsp1 are independent genes located very close to each other. All 3 genes are located in close proximity of Satt157. We believe that this is the first report of clustering of fertility-related genes in plants. Characterization of these closely linked genes may help in understanding the evolutionary relationship among them. PMID:19617521

Cervantes-Martinez, Innan; Sandhu, Devinder; Xu, Min; Ortiz-Pérez, Evelyn; Kato, Kiyoaki K; Horner, Harry T; Palmer, Reid G

2009-07-17

130

Sexual size dimorphism and male combat in snakes  

Microsoft Academic Search

This paper reviews published literature on snakes to test the hypothesis that large male size, relative to female size, evolves because of the advantage it confers in male combat. Analysis of the data reveals a high correlation between the occurrence of male combat, and sexual dimorphism in which the male is the larger sex. This correlation holds (i) within the

Richard Shine

1978-01-01

131

Sexual behavior patterns of customers of male street prostitutes  

Microsoft Academic Search

Information about male customers of male prostitutes, including sociodemographic and life-style characteristics, sexual and drug use behaviors, and knowledge about HIV infection were collected from a convenience sample of 211 male street prostitutes and a convenience sample of 15 male customers as part of a feasibility study. Data from these two groups indicate that despite knowledge of HIV infection and

Edward V. Morse; Patricia M. Simon; Paul M. Balson; Howard J. Osofsky

1992-01-01

132

Male Adolescents: Sexual Victimization and Subsequent Sexual Abuse  

Microsoft Academic Search

Veneziano, Veneziano and LeGrand (2000) found support for the victim to victimizer hypothesis of sexual aggression with 74 sexually abusive youth. This project, a further step in examining this theory (Burton, 2000, Burton, Miller, & Shill, 2002) builds on their ideas with data from 179 adolescent sexual abusers, and supports their findings. In an examination of relationships, gender, modus operandi,

David L. Burton

2003-01-01

133

Genetic Architecture of Male Sterility and Segregation Distortion in Drosophila pseudoobscura Bogota-USA Hybrids  

PubMed Central

Understanding the genetic basis of reproductive isolation between recently diverged species is a central problem in evolutionary genetics. Here, I present analyses of the genetic architecture underlying hybrid male sterility and segregation distortion between the Bogota and USA subspecies of Drosophila pseudoobscura. Previously, a single gene, Overdrive (Ovd), was shown to be necessary but not sufficient for both male sterility and segregation distortion in F1 hybrids between these subspecies, requiring several interacting partner loci for full manifestation of hybrid phenomena. I map these partner loci separately on the Bogota X chromosome and USA autosomes using a combination of different mapping strategies. I find that hybrid sterility involves a single hybrid incompatibility of at least seven interacting partner genes that includes three large-effect loci. Segregation distortion involves three loci on the Bogota X chromosome and one locus on the autosomes. The genetic bases of hybrid sterility and segregation distortion are at least partially—but not completely—overlapping. My results lay the foundation for fine-mapping experiments to identify the complete set of genes that interact with Overdrive. While individual genes that cause hybrid sterility or inviability have been identified in a few cases, my analysis provides a comprehensive look at the genetic architecture of all components of a hybrid incompatibility underlying F1 hybrid sterility. Such an analysis would likely be unfeasible for most species pairs due to their divergence time and emphasizes the importance of young species pairs such as the D. pseudoobscura subspecies studied here.

Phadnis, Nitin

2011-01-01

134

QTL involved in the partial restoration of male fertility of C-type cytoplasmic male sterility in maize  

Microsoft Academic Search

Partial restoration of male fertility limits the use of C-type cytoplasmic male sterility (C-CMS) for the production of hybrid\\u000a seeds in maize. Nevertheless, the genetic basis of the trait is still unknown. Therefore, the aim to this study was to identify\\u000a genomic regions that govern partial restoration by means of a QTL analysis carried out in an F2 population (n = 180).

Peter Stamp; Carsten Knaak; Rainer Messmer

2011-01-01

135

Predictors of sexual aggression among male juvenile offenders.  

PubMed

The purpose of this study was to conduct a longitudinal examination of predictors of sexual aggression among male juvenile offenders. Four hundred and four adolescent males between the ages of 14 and 17 years were recruited from juvenile probation offices to take part in a prospective study of substance use and sexual risk. At baseline, participants completed a series of questionnaires that assessed putative risk factors for sexual aggression. They then completed a measure of sexual aggression at the 6-month follow-up period. Correlational analyses revealed that participants who reported hard drug use, more frequent alcohol and marijuana use, and less severe offenses reported engaging in more severe sexual aggression. In addition, participants who reported higher impulsivity, sensation seeking, and externalizing behaviors also reported participating in more severe sexual aggression. When these variables were included in a regression analysis, only externalizing behaviors and severity of offense uniquely predicted severity of sexual aggression at the 6-month follow-up. PMID:22080583

Yeater, Elizabeth A; Lenberg, Kathryn L; Bryan, Angela D

2011-11-11

136

Sodium nitroprusside impairs sexual competence of male rats.  

PubMed

Recently, sodium nitroprusside (SNP), a potent nitric oxide (NO) donor and a clinically used antihypertensive, has been introduced as a penile self-injection medical therapy for erectile dysfunction. However, it is known that many antihypertensives impairs sexual competence; NO regulates sexual competence and NO is cytostatic and cytotoxic for human sperm. Thus, a possibility exists that SNP may impair male reproductive competence. Testing this aspect is the aim of this study. This was assessed in male rats (using three i.p. doses: 60, 30 or 20 microg/kg) using noncompetitive copulation tests. The results show that the highest dose of SNP was toxic and caused rapid mortality of treated rats (within 30 min). The mid and low doses of SNP reversibly impaired several parameters of sexual competence in a dose-related fashion: sexual arousability, libido and sexual vigour. Some parameters of sexual behaviour remained unaltered: sexual motivation and intromission ratio, whilst one parameter was improved: sexual performance. In complete contrast, the ejaculatory competence and fertility remained unchanged. The SNP-induced impairments in sexual competence may be attributable to lowered testosterone levels and sedation mediated via its specific action and/or side effect. Further, this impairment of sexual function was not due to general toxicity, inhibition of penile sensitivity, penile erection or analgesic activity. It is concluded that SNP impairs male sexual competence, at least, in rats although it promotes penile erection. PMID:15171569

Ratnasooriya, W D; Jayakody, J R A C; Dharmasiri, M G

2004-04-01

137

Sexual and Natural Selection Both Influence Male Genital Evolution  

PubMed Central

Rapid and divergent evolution of male genital morphology is a conspicuous and general pattern across internally fertilizing animals. Rapid genital evolution is thought to be the result of sexual selection, and the role of natural selection in genital evolution remains controversial. However, natural and sexual selection are believed to act antagonistically on male genital form. We conducted an experimental evolution study to investigate the combined effects of natural and sexual selection on the genital-arch lobes of male Drosophila simulans. Replicate populations were forced to evolve under lifetime monogamy (relaxed sexual selection) or lifetime polyandry (elevated sexual selection) and two temperature regimes, 25°C (relaxed natural selection) or 27°C (elevated natural selection) in a fully factorial design. We found that natural and sexual selection plus their interaction caused genital evolution. Natural selection caused some aspects of genital form to evolve away from their sexually selected shape, whereas natural and sexual selection operated in the same direction for other shape components. Additionally, sexual and natural selection tended to favour larger genitals. Thus we find that the underlying selection driving genital evolution is complex, does not only involve sexual selection, and that natural selection and sexual selection do not always act antagonistically.

Hodgson, Dave J.; Wedell, Nina; Sharma, Manmohan D.; Hunt, John; Hosken, David J.

2013-01-01

138

Differences between sexually victimized and nonsexually victimized male adolescent sexual abusers: developmental antecedents and behavioral comparisons.  

PubMed

This study compares sexually victimized and nonsexually victimized male adolescent sexual abusers on a number of variables. Self-report measures were administered to 325 male sexually abusive youth (average age 16) in six residential facilities in the Midwest, 55% of whom reported sexual victimization. The results indicate that the sexually victimized sexual abusers have more severe developmental antecedents (trauma, family characteristics, early exposure to pornography and personality) and recent behavioral difficulties (characteristics of sexual aggression, sexual arousal, use of pornography, and nonsexual criminal behavior) than the nonsexually victimized group. Results are contrasted with recent typological research, which found no relationship between sexual victimization and subtype membership. Treatment, research, and theoretical implications are discussed. PMID:21259148

Burton, David L; Duty, Kerry Jo; Leibowitz, George S

2011-01-01

139

Influence of a juvenile hormone analog and dietary protein on male Anastrepha suspensa (Diptera: Tephritidae) sexual success.  

PubMed

Juvenile hormone levels and adult diet have important effects on the attractiveness and competitiveness of male Anastrepha suspensa (Loew) (Caribbean fruit fly). Because the success of the sterile insect technique requires the release of males that can compete in the wild, these effects are of crucial importance. Laboratory and field cage experiments were conducted to compare male sexual performance on a lifetime basis and daily basis when submitted to four different treatments: (M+P+) application of the juvenile hormone analog, methoprene (M) and sugar and hydrolyzed yeast as adult food; (M+P-) application of M and sugar as adult food; (M-P+) no application of M and sugar and hydrolyzed yeast as adult food; and (M-P-) no application of M and sugar as adult food. On a daily basis, M+P+ males always performed better sexually, and 10% of these individuals were able to mate three consecutive times in the same day. However, the copula duration decreased with the increased number of matings on same day. In addition, M caused earlier maturation. On a lifetime basis, M+P+ males had significantly greater sexual success than other flies. The substantial improvement in male sexual performance because of the hormone application, protein supply, and interaction of hormone and protein has the potential of producing more efficacious sterile males. PMID:20214366

Pereira, Rui; Sivinski, John; Teal, Peter E A

2010-02-01

140

Solving an "appalling" problem: social reformers and the campaign for the Alberta Sexual Sterilization Act, 1928.  

PubMed

In this article, the author examines the campaign leading up to the passage of the Sexual Sterilization Act in Alberta in 1928. The author asserts that the passage of this Act was the result of the influence of a few elite individuals, particularly those involved with the United Farm Women of Alberta social reform movement, and may not have been reflective of widespread favourable public sentiment. While there were serious misgivings regarding the passage of the Sexual Sterilization Act, the legislation was ultimately successful because of the pressing problems of inadequate mental facilities and budgetary constraints. The author discusses the legislation's eventual repeal in 1972 due to public denunciation of eugenic measures, concerns about liability, and the threat posed to individual liberties. This article was the winner of the William Morrow Essay Contest in 1999. PMID:12465643

Nind, A N

2000-08-01

141

Characterization of a new male sterility-related gene Camf1 in Capsicum annum L.  

PubMed

For the sake of screening novel genes related to the male sterility in chili pepper for studying the molecular mechanism of plant male sterility, the gene differential expression analysis was performed by cDNA-amplified fragment length polymorphism (cDNA-AFLP) in the genic male sterile-fertile line 114AB of Capsicum annum L., and a variety of differentially expressed cDNA fragments were detected in fertile or sterility material. Camf1, a transcript-derived fragment (TDF) accumulated in fertile line flower buds was further investigated. The Camf1 has 1,854 bp in length with no introns containing a 1,707-bp open reading frame (ORF). The deduced amino acid sequence of Camf1 shares higher similarity to some members from a glyoxal oxidase-related protein family, and has a glyoxal oxidase conserved domain at the N-terminus and a domain of unknown function (DUF1929) at C-terminal end. Expression analysis showed that Camf1 expressed only in stage 3-7 flower buds of male fertile of C. annum L. 114AB, and no detection in all organs of male sterility. The peak of expression level of Camf1 appeared at stage 4 flower buds of fertile line. Furthermore, expression analysis of different organs revealed that Camf1 expressed only in anthers of male fertile material and there were no expression in sepals, petals, pistils, roots, stems, leaves and open flowers. These results suggested that Camf1 was an anther-specific gene and might be essential for the fertility of C. annum L. PMID:21559833

Chen, Chang Ming; Hao, Xue Feng; Chen, Guo Ju; Cao, Bi Hao; Chen, Qing Hua; Liu, Shao Qun; Lei, Jian Jun

2011-05-11

142

Male-male competition, female mate choice and their interaction: determining total sexual selection.  

PubMed

Empirical studies of sexual selection typically focus on one of the two mechanisms of sexual selection without integrating these into a description of total sexual selection, or study total sexual selection without quantifying the contributions of all of the mechanisms of sexual selection. However, this can provide an incomplete or misleading view of how sexually selected traits evolve if the mechanisms of sexual selection are opposing or differ in form. Here, we take a two-fold approach to advocate a direction for future studies of sexual selection. We first show how a quantitative partitioning and examination of sexual selection mechanisms can inform by identifying illustrative studies that describe both male-male competition and female mate choice acting on the same trait. In our sample, the most common trait where this occurred was body size, and selection was typically linear. We found that male-male competition and female mate choice can be reinforcing or opposing, although the former is most common in the literature. The mechanisms of sexual selection can occur simultaneously or sequentially, and we found they were more likely to be opposing when the mechanisms operated sequentially. The degree and timing that these mechanisms interact have important implications for the operation of sexual selection and needs to be considered in designing studies. Our examples highlight where empirical data are needed. We especially lack standardized measures of the form and strength of selection imposed by each mechanism of sexual selection and how they combine to determine total sexual selection. Secondly, using quantitative genetic principles, we outline how the selection imposed by individual mechanisms can be measured and combined to estimate the total strength and form of sexual selection. We discuss the evolutionary consequences of combining the mechanisms of sexual selection and interpreting total sexual selection. We suggest how this approach may result in empirical progress in the field of sexual selection. PMID:19120810

Hunt, John; Breuker, Casper J; Sadowski, Jennifer A; Moore, Allen J

2009-01-01

143

An evolutionarily conserved mitochondrial orf108 is associated with cytoplasmic male sterility in different alloplasmic lines of Brassica juncea and induces male sterility in transgenic Arabidopsis thaliana.  

PubMed

Nuclear-mitochondrial gene interactions governing cytoplasmic male sterility (CMS) in angiosperms have been found to be unique to each system. Fertility restoration of three diverse alloplasmic CMS lines of Brassica juncea by a line carrying the fertility-restorer gene introgressed from Moricandia arvensis prompted this investigation to examine the molecular basis of CMS in these lines. Since previous studies had found altered atpA transcription associated with CMS in these lines, the atpA genes and transcripts of CMS, fertility-restored, and euplasmic lines were cloned and compared. atpA coding and downstream sequences were conserved among CMS and euplasmic lines but major differences were found in the 5' flanking sequences of atpA. A unique open reading frame (ORF), orf108, co-transcribed with atpA, was found in male sterile flowers of CMS lines carrying mitochondrial genomes of Diplotaxis berthautii, D. catholica, or D. erucoides. In presence of the restorer gene, the bicistronic orf108-atpA transcript was cleaved within orf108 to yield a monocistronic atpA transcript. Transgenic expression of orf108 with anther-specific Atprx18 promoter in Arabidopsis thaliana gave 50% pollen sterility, indicating that Orf108 is lethal at the gametophytic stage. Further, lack of transmission of orf108 to the progeny showed for the first time that mitochondrial ORFs could also cause female sterility. orf108 was found to be widely distributed among wild relatives of Brassica, indicating its ancient origin. This is the first report that shows that CMS lines of different origin and morphology could share common molecular basis. The gametic lethality of Orf108 offers a novel opportunity for transgene containment. PMID:22371076

Kumar, Pankaj; Vasupalli, Naresh; Srinivasan, R; Bhat, Shripad R

2012-02-27

144

The Assessment of Sexual Functions in Women with Male Partners Complaining of Erectile Dysfunction: Does Treatment of Male Sexual Dysfunction Improve Female Partner's Sexual Functions?  

Microsoft Academic Search

The aims of this prospective study were to compare sexual functioning between women with male partners who have erectile dysfunction (ED) and women without partners with ED and also to investigate the effect of the treatment of male ED on female partner's sexual function. The study included 87 women and their male partners. We divided the women into two groups:

SELAH?TT?N ÇAYAN; MURAT BOZLU; BÜLENT CANPOLAT; ERDEM AKBAY

2004-01-01

145

Transfer of cytoplasmic male sterility by selection for streptomycin resistance after protoplast fusion in Nicotiana  

Microsoft Academic Search

Cytoplasmic male sterility (CMS) in Nicotiana is located on mitochondrial DNA (mtDNA) on which no selectable mutation has been isolated. The possibility of co-transfer of CMS and a selectable chloroplast trait, streptomycin resistance, was investigated by marker rescue from irradiated protoplasts, a method described from this laboratory (Menczel et al. 1982). As the source of the CMS factor, the Nicotiana

László Menczel; Ferenc Nagy; Gabriella Lázár; Pál Maliga

1983-01-01

146

ORIENTAL FRUIT FLY: MALES-ONLY STERILE FLY RELEASES IN HAWAII  

Technology Transfer Automated Retrieval System (TEKTRAN)

Beginning in late August, 2004, we began a program to release sterile male oriental fruit flies, Bactrocera dorsalis, in a citrus orchard in central Oahu, Hawaii. This program follows the encouraging results obtained with the melon fly genetic sexing strain on the islands of Hawaii, Maui, and Oahu. ...

147

HYBRID DYSGENESIS IN DROSOPHILA MELANOGASTER: A SYNDROME OF ABERRANT TRAITS INCLUDING MUTATION, STERILITY AND MALE RECOMBINATION  

Microsoft Academic Search

A syndrome of associated aberrant traits is described in Drosophila mel- anogaster. Six of these traits, mutation, sterility, male recombination, trans- mission ratio distortion, chromosomal aberrations and local increases in female recombination, have previously been reported. A seventh trait, nondisjunc- tion, is described for the first time. All of the traits we have examined are found nonreciprocally in F, hybrids.

MARGARET G. KIDWELL; JAMES F. KIDWELL; JOHN A. SVED

148

Two new types of cytoplasmic male sterility found in wild Beta beets  

Microsoft Academic Search

Mitochondrial (mt) and chloroplast (ct) DNAs from sugar beet carrying normal fertile and different cytoplasmic male sterile (cms) cytoplasms were compared by restriction analysis and for the occurrence of minicircles. One of the cms materials had the Owen cms cytoplasm currently used for hybrid production in sugar beet; the other three cms materials were derived from wild Beta beets. The

C. Halldén; T. Bryngelsson; N. O. Bosemark

1988-01-01

149

Improving hybrid seed production in corn with glyphosate-mediated male sterility.  

PubMed

BACKGROUND: Hybrid corn varieties exhibit benefits associated with heterosis and account for most of the corn acreage in the USA. Hybrid seed corn is produced by crossing a female parent which is male-sterile and therefore incapable of self-pollination with a male parent as the pollen donor. The majority of hybrid seed corn is produced by mechanical detasseling which involves physically removing the tassel, a process that is laborious and costly. RESULTS: Glyphosate-resistant corn was developed via expression of a glyphosate insensitive 5-enolpyruvyl-shikimate 3-phosphate synthase enzyme (CP4-EPSPS). Experimentation with molecular expression elements resulted in selective reduction of CP4-EPSPS expression in male reproductive tissues. The resulting plant demonstrated sterile tassel following glyphosate application with little to no injury to the rest of the plant. Using (14) C-glyphosate as a marker, we also examined the translocation of glyphosate to the tassel via spray application in a track sprayer to simulate field application. The results allowed optimization of spray parameters such as dose, spray timing and target to maximize tassel delivery of glyphosate for efficient sterilization. CONCLUSION: The Roundup hybridization system (RHS) is a novel process for hybrid seed production based on glyphosate-mediated male sterility. RHS replaces mechanical detasseling with glyphosate spray and greatly simplifies the process of hybrid seed corn production. © 2013 Society of Chemical Industry. PMID:23460547

Feng, Paul C C; Qi, Youlin; Chiu, Tommy; Stoecker, Martin A; Schuster, Christopher L; Johnson, Scott C; Fonseca, Augustine E; Huang, Jintai

2013-03-01

150

Meiotic studies in a series of 1100 infertile and sterile males  

Microsoft Academic Search

Meiotic studies have been carried out in a series of 1100 infertile and sterile males. Of these, 599 cases have been studies in testicular biopsy, and 501, in semen samples. This is the largest meiotic series published so far. The incidence of meiotic anomalies was 4.3%. The most frequent chromosome abnormality was desynapsis (3.7%). However, the number of cases with

J. Egozcue; C. Templado; F. Vidal; J. Navarro; F. Morer-Fargas; S. Marina

1983-01-01

151

The Male Sterility Locus ms3 is Present in a Fertility Controlling Gene Cluster in Soybean  

Technology Transfer Automated Retrieval System (TEKTRAN)

Soybean [Glycine max (L.) Merr.] is a self-pollinated plant. Manual cross-pollination is used to produce limited quantities of hybrid seed. To produce large quantities of hybrid seed, insect-mediated cross-pollination is necessary. An efficient nuclear male-sterile system for hybrid seed producti...

152

Characterisation and expression of the mitochondrial genome of a new type of cytoplasmic male-sterile sunflower  

Microsoft Academic Search

A new cytoplasmic male sterile sunflower, CMS3 [44], was characterised in relation to the Petiolaris (PET1) cytoplasmic male-sterile sunflower, CMS89 [25]. Southern blot analysis showed that the mitochondrial genome of CMS3 contains unique rearrangements in at least five loci (atp6, atp9, atpA, nad1+5 and coxIII) compared to the PET1 sterile and the fertile cytoplasms. Transcripts of two (coxIII and atp6)

Mariana Spassova; Françoise Moneger; Christopher J. Leaver; Peter Petrov; Atanas Atanassov; H. John J. Nijkamp; Jacques Hille

1994-01-01

153

Sexual Victimization Among Male College Students: Assault Severity, Sexual Functioning, and Health Risk Behaviors  

Microsoft Academic Search

The purpose of this study was to examine the relationship between college men's sexual victimization experiences, engagement in a number of health risk behaviors, and sexual functioning. The study also examined sexual victimization by assault severity categories and utilized a multiitem, behaviorally specific, gender-neutral measure. Three hundred and two male college students were recruited for the current study from a

Jessica A. Turchik

2012-01-01

154

Effects of Positive and Negative Mood on Sexual Arousal in Sexually Functional Males  

Microsoft Academic Search

Effects of positive and negative musical mood induction on subjective and objective sexual arousal were examined in a group of sexually functional males (N = 24). Subjects evidenced significantly greater objective and subjective sexual response in the positive mood induction condition relative to both baseline and a neutral control condition. In contrast, the negative mood induction condition yielded significantly less

William B. Mitchell; Patricia Marten Dibartolo; Timothy A. Brown; David H. Barlow

1998-01-01

155

Male and female sexual orientation differences in gambling  

Microsoft Academic Search

The purpose of this study was to determine whether sexual orientation differences in gambling exist that parallel those for sex—a question motivated by the idea that male homosexuality arises from prenatal brain feminization and that female homosexuality arises from prenatal brain masculinization. For gambling frequency, we hypothesized that male homosexuals would be more similar to female heterosexuals than male heterosexuals,

Scott L. Hershberger; Anthony F. Bogaert

2005-01-01

156

Novel composition of mitochondrial genomes in Petunia somatic hybrids derived from cytoplasmic male sterile and fertile plants  

Microsoft Academic Search

The mitochondrial genomes of petunia somatic hybrid plants, which were derived from the fusion of male fertile P. hybrida protoplasts with cytoplasmic male sterile P. parodii protoplasts, were analyzed by endonuclease restriction and Southern blot hybridization analyses. We studied sterile and fertile somatic hybrids to address two main questions. First, is there any correlation between the mitochondrial DNA restriction banding

Maury L. Boeshore; Irit Lifshitz; Maureen R. Hanson; Shamay Izhar

1983-01-01

157

NUCLEAR RESOTRATION OF MALE FERTILITY CONFIRMS THAT A SOURCE OF ONION CYTOPLASMIC MALE STERILITY FROM 'NASIK WHITE' IS S-CYTOPLASMIC  

Technology Transfer Automated Retrieval System (TEKTRAN)

There are two known sources of cytoplasmic-genic male sterility (CMS) used to produce hybrid onion (Allium cepa L.) seed, S and T cytoplasms. Male-sterility has been observed in numerous other onion populations, indicating that additional sources of CMS may exist. A potentially new source of CMS w...

158

[Perinatal clomiphene citrate treatment changes sexual orientations of male mice].  

PubMed

Perinatal period and adolescence are critical for brain development, which is the biological basis of an individual's sexual orientation and sexual behavior. In this study, animals were divided into two groups and their sexual orientations were observed: one group experienced drug treatments during the perinatal period, and the other group was castrated at puberty. The results showed that estradiol treatment had no effect on mature male offspring's sexual orientations, but 9 days and 14 days of clomiphene citrate treatment significantly increased the chance of homosexuality and effeminized behavior. In addition, the sexual orientation of mature normal male offspring, which were castrated when they were 21 days old,was not significant different from the control animals. These findings suggest that the inhibition of perinatal estrogen activities could suppress individual male-typical responses, enhance female-typical responses and induce homosexual orientations. Moreover, the masculinizing effects of estrogen were more obvious during perinatal period than adolescence. PMID:24115661

He, Feng-Qin; Zhang, Heng-Rui

2013-10-01

159

Effects of Perpetrator Gender and Victim Sexuality on Blame Toward Male Victims of Sexual Assault  

Microsoft Academic Search

Most researchers who have investigated attributions of blame toward victims in sexual-assault depictions have considered only female victims of male perpetrators. Few researchers have investigated the effects of perpetrator gender or victim sexual orientation on blame attributions toward male victims. The present authors investigated those two variables. Participants were 161 undergraduates at a British university in social science courses, each

Michelle Davies; Paul Pollard; John Archer

2006-01-01

160

Alcohol, Psychological Conservatism, and Sexual Interest in Male Social Drinkers  

Microsoft Academic Search

The present study investigated self-reported sexual interest following alcohol consumption in 48 male social drinkers ([Xbar] age = 19.7 years). A sexual interest questionnaire and Wilson's Psychological Conservatism Scale were administered in a pretest-posttest design. The results indicated that while self-reported sexual interest appeared to increase with alcohol doses, beliefs regarding the alcohol content of the drink may mediate this

Julian Barling; Frank Fincham

1980-01-01

161

Measuring Love: Sexual Minority Male Youths’ Ideal Romantic Characteristics  

Microsoft Academic Search

Research examining how sexual minorities characterize love within same-sex relationships is scarce. In this study, the authors examined the validity of Sternberg's triangular theory of love in a sample of sexual minority male youth (N = 447). To test the adequacy of the theory for our population, the authors examined the psychometric properties of the Triadic Love Scale (TLS) and

JosÉ A. Bauermeister; Michelle M. Johns; Emily Pingel; Anna Eisenberg; Matt Leslie Santana; Marc Zimmerman

2011-01-01

162

Genetic Architecture of Hybrid Male Sterility in Drosophila: Analysis of Intraspecies Variation for Interspecies Isolation  

PubMed Central

Background The genetic basis of postzygotic isolation is a central puzzle in evolutionary biology. Evolutionary forces causing hybrid sterility or inviability act on the responsible genes while they still are polymorphic, thus we have to study these traits as they arise, before isolation is complete. Methodology/Principal Findings Isofemale strains of D. mojavensis vary significantly in their production of sterile F1 sons when females are crossed to D. arizonae males. We took advantage of the intraspecific polymorphism, in a novel design, to perform quantitative trait locus (QTL) mapping analyses directly on F1 hybrid male sterility itself. We found that the genetic architecture of the polymorphism for hybrid male sterility (HMS) in the F1 is complex, involving multiple QTL, epistasis, and cytoplasmic effects. Conclusions/Significance The role of extensive intraspecific polymorphism, multiple QTL, and epistatic interactions in HMS in this young species pair shows that HMS is arising as a complex trait in this system. Directional selection alone would be unlikely to maintain polymorphism at multiple loci, thus we hypothesize that directional selection is unlikely to be the only evolutionary force influencing postzygotic isolation.

Reed, Laura K.; LaFlamme, Brooke A.; Markow, Therese A.

2008-01-01

163

A Social Learning Theory Comparison of the Sexual Victimization of Adolescent Sexual Offenders and Nonsexual Offending Male Delinquents.  

ERIC Educational Resources Information Center

|A study compared 216 adolescent sexually victimized sexual offenders and 93 adolescent sexually victimized nonsexual offending delinquents. Sexually offending delinquents had closer relationships with their perpetrators, a higher chance of having a male perpetrator, a longer duration of sexual victimization, more forceful sexual victimization,…

Burton, David L.; Miller, Diane Lynn; Shill, Chien Tai

2002-01-01

164

Molecular diversity of male sterility inducing and male-fertile cytoplasms in the genus Helianthus.  

PubMed

The organisation of mtDNA was investigated for 28 sources of cytoplasmic male sterility (CMS) and a fertile line (normal cytoplasm) of Helianthus annuus by Southern hybridisation. In addition to nine known mitochondrial genes ( atp6, atp9, cob, coxI, coxII, coxIII, 18S, 5S and nd5) three probes for the open reading frames in the rearranged area of PET1, orfH522, orfH708 and orfH873, were used. Genetic similarities of the investigat-ed cytoplasms varied between 0.3 and 1. Cluster analyses using the UPGMA method allowed the distinction of ten mitochondrial (mt) types between the 29 investigated cytoplasms. Most mitochondrial types comprise two or more CMS sources, which could not be further separated, like the PET1-like CMS sources (with the exception of ANO1 and PRR1), or ANN1/ANN2/ANN3, ANN4/ ANN5, ARG3/RIG1, BOL1/EXI1/PEF1/PEP1 and GIG1/ PET2. ANL1, ANL2 and the fertile cytoplasms are also regarded as one mitochondrial type. Unique banding patterns were only observed for ANT1 ( atp6), MAX1 ( atp6, orfH522 and orfH708) and PRR1 ( coxII). However, four of the mitochondrial types showed unique hybridisation signals: ANN4/ANN5 had characteristic bands for atp6 and orfH708, PEF1/PEP1/EXI1/BOL1 for atp6and coxII, and PET2/GIG1 for atp9. The PET1-like cytoplasms all shared the same patterns for orfH522, orfH708and cob (except ANO1). It could be demonstrated that CMS sources, like, e.g., PET2 and PEF1, are different from PET1 in mtDNA organisation and the CMS mechanism. Therefore, these CMS sources represent interesting candidates for the development of new hybrid breeding systems based on new CMS mechanisms. PMID:12582659

Horn, R.

2002-03-01

165

Social preferences based on sexual attractiveness: a female strategy to reduce male sexual attention  

PubMed Central

Male sexual harassment of females is common across sexually reproducing species and can result in fitness costs to females. We hypothesized that females can reduce unwanted male attention by constructing a social niche where their female associates are more sexually attractive than themselves, thus influencing the decision-making of males to their advantage. We tested this hypothesis in the Trinidadian guppy (Poecilia reticulata), a species with high levels of male sexual harassment. First, we confirmed that non-receptive females were harassed less when they were paired with a more sexually attractive (receptive) female than with another non-receptive female. We then found that, indeed, females exploit this as a strategy to reduce sexual harassment; non-receptive females actively preferred to associate with receptive over non-receptive females. Importantly, when given access only to chemosensory cues, non-receptive females still showed this preference, suggesting that they use information from chemical cues to assess the sexual attractiveness of potential female partners. Receptive females in contrast showed no such preferences. Our results demonstrate that females can decrease male harassment by associating with females that are more sexually attractive than themselves and that they perform active partner choices based on this relative attractiveness. We propose that this strategy is likely to represent an important pathway by which females can construct social niches that influence the decision-making of others to their advantage; in this case, to reduce the sexual harassment they experience.

Brask, Josefine B.; Croft, Darren P.; Thompson, Katharine; Dabelsteen, Torben; Darden, Safi K.

2012-01-01

166

Social preferences based on sexual attractiveness: a female strategy to reduce male sexual attention.  

PubMed

Male sexual harassment of females is common across sexually reproducing species and can result in fitness costs to females. We hypothesized that females can reduce unwanted male attention by constructing a social niche where their female associates are more sexually attractive than themselves, thus influencing the decision-making of males to their advantage. We tested this hypothesis in the Trinidadian guppy (Poecilia reticulata), a species with high levels of male sexual harassment. First, we confirmed that non-receptive females were harassed less when they were paired with a more sexually attractive (receptive) female than with another non-receptive female. We then found that, indeed, females exploit this as a strategy to reduce sexual harassment; non-receptive females actively preferred to associate with receptive over non-receptive females. Importantly, when given access only to chemosensory cues, non-receptive females still showed this preference, suggesting that they use information from chemical cues to assess the sexual attractiveness of potential female partners. Receptive females in contrast showed no such preferences. Our results demonstrate that females can decrease male harassment by associating with females that are more sexually attractive than themselves and that they perform active partner choices based on this relative attractiveness. We propose that this strategy is likely to represent an important pathway by which females can construct social niches that influence the decision-making of others to their advantage; in this case, to reduce the sexual harassment they experience. PMID:22158959

Brask, Josefine B; Croft, Darren P; Thompson, Katharine; Dabelsteen, Torben; Darden, Safi K

2011-12-07

167

Nitric oxide is involved in male sexual behavior of rats.  

PubMed

In male rats, whether sexually experienced or sexually naive, the intraperitoneal administration of L-arginine (the natural substrate for nitric oxide synthase) (10, 25, 50 mg/kg) both increased the percentage of copulating in sexually naive rats and improved the indexes of sexual performance in sexually experienced rats, whereas the intraperitoneal administration of N(G)-nitro-L-arginine methyl ester (L-NAME) (a potent inhibitor of nitric oxide synthase) (10, 25, 50 mg/kg) had opposite effects. In contrast, after intracerebroventricular administration, L-arginine (25, 50, 100 microg/rat) had no effect - whether in naive or in experienced rats - whereas L-NAME completely prevented ejaculation in naive rats, at the dose of 100 microg/rat, but had no effect at all in experienced rats, up to the dose of 300 microg/rat. Finally, a direct relationship seems to exist between male copulatory performance and nitric oxide synthase activity in a discrete and defined brain area, the paraventricular nucleus of the hypothalamus: indeed, nitric oxide synthase mRNA expression in this nucleus in sexually potent rats is about twice that in sexually impotent rats. It is concluded that nitric oxide synthase is involved in the expression of male sexual activity, in spite of some inconsistencies that are hard to interpret. PMID:8750712

Benelli, A; Bertolini, A; Poggioli, R; Cavazzuti, E; Calza, L; Giardino, L; Arletti, R

1995-12-29

168

Examining the Development and Sexual Behavior of Adolescent Males  

PubMed Central

A careful examination of young men's sexuality by health professionals in pediatrics, primary care and reproductive health is foundational to adolescent male sexual health and healthy development. Through a review of existing literature, this article provides background and a developmental framework for sexual health services for adolescent boys. The article first defines and provides an overview of adolescent boys’ sexual health, and then discusses developmentally focused research on the following topics: (1) early romantic relationships and the evolution of power and influence within these relationships; (2) developmental “readiness” for sex and curiosity; (3) boys’ need for closeness and intimacy; (4) adopting codes of masculinity; (5) boys’ communicating about sex; and (6) contextual influences from peers, families, and providers. This article concludes by examining the implications of these data for sexual health promotion efforts for adolescent males, including HPV vaccination.

Ott, Mary A.

2010-01-01

169

An axonemal dynein at the Hybrid Sterility 6 locus: implications for t haplotype-specific male sterility and the evolution of species barriers  

Microsoft Academic Search

.   Poor sperm motility characterized by a distinct aberration in flagellar waveform known as ``curlicue'' is a hallmark of t haplotype (t) homozygous male sterility. Previous studies have localized ``curlicue'' and a flagellar developmental defect, ``whipless'',\\u000a to the Hybrid Sterility 6 locus (Hst6), between the markers Pim1 and Crya1. More recent heterospecific breeding experiments between Mus spretus (Spretus) and Mus

John Fossella; Sadhana A. Samant; Lee M. Silver; Stephen M. King; Kevin T. Vaughan; Patricia Olds-Clarke; Karl A. Johnson; Atsushi Mikami; Richard B. Vallee; Stephen H. Pilder

2000-01-01

170

Discovery of a novel cytoplasmic male-sterility and its restorer lines in radish (Raphanus sativus L.).  

PubMed

A male-sterile (MS) radish (Raphanus sativus L.) was found in an accession collected from Uzbekistan. Unlike Ogura MS radishes in which no pollen grain is typically visible during anthesis, a small number of pollen grains stuck together in the dehiscing anthers was observed in the newly identified MS radish. Fluorescein diacetate tests and scanning electron micrographs showed that pollen grains in the new MS radish were severely deformed and non-viable. Cytological examination of pollen development stages showed a clear difference in the defective stage from that seen in Ogura male-sterility. Reciprocal cross-pollination with diverse male-fertile lines indicated that pollen grains of the new MS radish were completely sterile, and the female organs were fully fertile. When the new MS radish and Ogura MS lines were cross-pollinated with a set of eight breeding lines, all F1 progeny originating from crosses with the new MS radish were male-sterile. In contrast, most of the F1 progeny resulting from crosses with Ogura MS lines were male-fertile. These results demonstrated that factors associated with induction of the newly identified male-sterility are different from those of Ogura male-sterility. The lack of restorer lines for the newly identified male-sterility led us to predict that it might be a complete cytoplasmic male-sterility without restorer-of-fertility genes in nuclear genomes. However, cross-pollination with more diverse radish germplasm identified one accession introduced from Russia that could completely restore fertility, proving the existence of restorer-of-fertility gene(s) for the new male-sterility. Meanwhile, the PCR amplification profile of molecular markers for the classification of radish mitochondrial genome types revealed that the new MS radish contained a novel mitotype. PMID:18597066

Lee, Young-Pyo; Park, Suhyung; Lim, Chaewan; Kim, Hyojung; Lim, Heerae; Ahn, Youngsoon; Sung, Soon-Kee; Yoon, Moo-Kyoung; Kim, Sunggil

2008-07-03

171

Measuring Love: Sexual Minority Male Youths' Ideal Romantic Characteristics  

PubMed Central

Research examining how sexual minorities characterize love within same-sex relationships is scarce. In this study, we examined the validity of Sternberg's Triangular Theory of Love in a sample of sexual minority male youth (N = 447). To test the adequacy of the theory for our population, we examined the psychometric properties of the Triadic Love Scale (TLS) and tested whether the three underlying constructs of the theory (Intimacy, Passion, and Commitment) emerged when participants were asked to consider their ideal relationship with another man. Using confirmatory factor analysis (CFA), we found support for the three-factor solution to characterize sexual minority male youths’ ideal romantic relationship, after minimizing item cross-loadings and adapting the content of the Passion subscale. We discuss the implications of our findings regarding the measurement of the TLS among sexual minority male youth and propose ways to enhance its measurement in future research.

Bauermeister, Jose A.; Johns, Michelle M.; Pingel, Emily; Eisenberg, Anna; Santana, Matt Leslie; Zimmerman, Marc

2011-01-01

172

Sexual psychodynamics I: the origins of male aggression.  

PubMed

At its inception, psychoanalytic psychology heavily emphasized sexuality. Freud's ideas about the centrality of sexuality in development and in the etiology of psychopathology were accepted for many years by organized psychoanalysis and psychiatry. Modern psychoanalytic theory has replaced sexuality as an organizing concept with diverse paradigms and the field has fragmented as a result. Of the many theories that Freud posed about the role of sexuality in psychological functioning perhaps his most influential were those pertaining to the Oedipus complex. In this, the first article of a series on the psychodynamic aspects of human sexuality, Oedipal aggression in males is considered from a biopsychosocial perspective. Knowledge about sexual differentiation of the brain and sex differences in behavior resulting from research carried out after Freud's death suggests the need to revise Freud's ideas about the Oedipus complex. PMID:17480192

Friedman, Richard C; Downey, Jennifer I

2007-01-01

173

Sexual and male horn dimorphism in Copris ochus (Coleoptera: Scarabaeidae).  

PubMed

Copris ochus (Coleoptera: Scarabaeidae), an endangered species, is the largest dung beetle in Japan. In C. ochus, males have a long head horn, while females lack this long horn (sexual dimorphism). Very large males of C. ochus have disproportionately longer head horns than small males, suggesting male horn dimorphism, although the dimorphism has not been investigated quantitatively. To clarify sexual and male horn dimorphism in C. ochus quantitatively, we examined the scaling relationship between body size (prothorax width) and head horn length in 94 females and 76 males. These beetles were captured during July 1978 from a natural population on Mt. Aso in southwestern Japan using a light trap. Although the horn length of the females and males scaled with prothorax width, the scaling relationship differed between the sexes, i.e., the relationship was linear in females and nonlinear in males. Statistical tests for dimorphism in male horn length showed a significant discontinuous relationship, thus indicating distinct sexual and male dimorphism in head horns. Long- and short-horned C. ochus males may have different reproductive behaviors, as described in other horned dung beetles. PMID:18348608

Sugiura, Shinji; Yamaura, Yuichi; Makihara, Hiroshi

2007-11-01

174

Religious Correlates of Male Sexual Behavior and Contraceptive Use.  

ERIC Educational Resources Information Center

This study sought to determine whether religious beliefs could distinguish between older adolescent males of differing sexual experience and to determine whether such beliefs could distinguish between older adolescent males differing in frequency of contraceptive use. Results are discussed and implications for health educators are set forth. (MT)

Young, Michael

1985-01-01

175

Sexual identity: Conflict and confusion in a male adolescent  

Microsoft Academic Search

This paper presents a conceptual formulation, derived from developmental object relations theory and ego psychology, of the passage in male adolescence that culminates with the achievement of a masculine heterosexual identity. Themes of psychosexuality, male gender attributes, masculinity and object preference, and sexual orientation are discussed with reference to the adolescent stage. Finally, the critical tasks, core conflicts, and internalizations

Randolph L. Lucente

1996-01-01

176

SEXUAL REFLEXES AND MATING BEHAVIOR IN THE MALE DOG  

Microsoft Academic Search

APPETITIVE BEHAVIOR AND COPULATORY RESPONSES WHICH CHARACTERIZE THE MATING BEHAVIOR OF MALE BEAGLES WERE STUDIED IN DETAIL. 4 DIFFERENT SEXUAL REFLEXES EXHIBITED BY SPINAL MALE BEAGLES WERE COMPARED TO RELEVANT ASPECTS OF THE MATING BEHAVIOR. IT IS CONCLUDED THAT SOME ASPECTS OF MATING BEHAVIOR, PARTICULARLY THE INTENSE EJACULATORY REACTION (IER) AND THE COPULATORY LOCK, ARE PROBABLY COMPLETELY MEDIATED AT THE

BENJAMIN L. HART

1967-01-01

177

Prevalence and Determinants of Male Sexual Dysfunctions During First Intercourse  

Microsoft Academic Search

We explored the balance of genetic and environmental factors on sexual dysfunctions during first intercourse experience in young men. Gender role conflict theory predicts that young males should show high levels of such dysfunctions coupled with mixed affective reactions. Three thousand one hundred eighty six male twins and their siblings (M = 26.17 years, SD = 4.77) completed items on

Pekka Santtila; N. Kenneth Sandnabba; Patrick Jern

2009-01-01

178

Stoichiometric Shifts in the Common Bean Mitochondrial Genome Leading to Male Sterility and Spontaneous Reversion to Fertility  

Microsoft Academic Search

The plant mitochondrial genome is characterized by a complex, multipartite structure. In cytoplasmic male-sterile (CMS) common bean, the sterility-inducing mitochondrial configuration maps as three autonomous DNA molecules, one containing the sterility-associated sequence pvs-orf239. We constructed a physical map of the mitochondrial ge- nome from the direct progenitors to the CMS cytoplasm and have shown that it maps as a single,

Hanna Janska; Rodrigo Sarria; Magdalena Woloszynska; Maria Arrieta-Montiel; Sally A. Mackenzie

1998-01-01

179

Blind sterile 2 (bs2), a hypomorphic mutation in Agps, results in cataracts and male sterility in mice  

PubMed Central

Blind sterile 2 (bs2) is a spontaneous autosomal recessive mouse mutation exhibiting cataracts and male sterility. Detailed clinical and histological evaluation revealed that bs2 mice have cataracts resulting from severely disrupted lens fiber cells. Analysis of bs2 testes revealed the absence of mature sperm and the presence of large multinucleate cells within the lumens of seminiferous tubules. Linkage analysis mapped the bs2 locus to mouse chromosome 2, approximately 45cM distal from the centromere. Fine mapping established a 3.1Mb bs2 critical region containing 19 candidate genes. Sequence analysis of alkylglycerone-phosphate synthase (Agps), a gene within the bs2 critical region, revealed a G to A substitution at the +5 position of intron 14. This mutation results in two abundantly expressed aberrantly spliced Agps transcripts: Agps?exon14 lacking exon 14 or Agpsexon?13–14 lacking both exons 13 and 14 as well as full-length Agps transcript. Agps is a peroxisomal enzyme which catalyzes the formation of the ether bond during the synthesis of ether lipids. Both aberrantly spliced Agps?exon14 and Agpsexon?13–14 transcripts led to frame shift, premature stop and putative proteins lacking the enzymatic FAD domain. We present evidence that bs2 mice have significantly decreased levels of ether lipids. Human mutations in Agps result in rhizomelic chondrodysplasia punctata type 3 (RCDP3), a disease for which bs2 is the only genetic model. Thus, bs2 is a hypomorphic mutation in Agps, and represents a useful model for investigation of the tissue specificity of ether lipid requirements which will be particularly valuable for elucidating the mechanism of disease phenotypes resulting from ether lipid depletion.

Liegel, R.; Chang, B.; Dubielzig, R.; Sidjanin, D.J.

2011-01-01

180

Males as sexual assault victims: multiple levels of trauma.  

PubMed

The definite and persistent phenomenon of sexual assault upon males is virtually ignored in the literature, although incidence data reported here suggest the greater scope of the problem. The avoidance of the subject of sexual assault on males creates a negative environment for victims. While the motivation of assailants is briefly discussed, the article focuses on the psychological aftermath for sexual assault victims. A paradigm is offered, consisting of "Set-up," "Attack," and "Aftermath" phases. Male victims suffer "Rape Trauma Syndrome" as described for females, as well as various forms of stigmatization and secondary trauma. Differences and similarities between male and female victims are identified. Victim responses are discussed as they proceed through several stages, with implications for appropriate interventions on both the clinical and community levels. The article concludes with an extensive bibliography. PMID:7050240

Anderson, C L

181

Sterility and Gene Expression in Hybrid Males of Xenopus laevis and X. muelleri  

PubMed Central

Background Reproductive isolation is a defining characteristic of populations that represent unique biological species, yet we know very little about the gene expression basis for reproductive isolation. The advent of powerful molecular biology tools provides the ability to identify genes involved in reproductive isolation and focuses attention on the molecular mechanisms that separate biological species. Herein we quantify the sterility pattern of hybrid males in African Clawed Frogs (Xenopus) and apply microarray analysis of the expression pattern found in testes to identify genes that are misexpressed in hybrid males relative to their two parental species (Xenopus laevis and X. muelleri). Methodology/Principal Findings Phenotypic characteristics of spermatogenesis in sterile male hybrids (X. laevis x X. muelleri) were examined using a novel sperm assay that allowed quantification of live, dead, and undifferentiated sperm cells, the number of motile vs. immotile sperm, and sperm morphology. Hybrids exhibited a dramatically lower abundance of mature sperm relative to the parental species. Hybrid spermatozoa were larger in size and accompanied by numerous undifferentiated sperm cells. Microarray analysis of gene expression in testes was combined with a correction for sequence divergence derived from genomic hybridizations to identify candidate genes involved in the sterility phenotype. Analysis of the transcriptome revealed a striking asymmetric pattern of misexpression. There were only about 140 genes misexpressed in hybrids compared to X. laevis but nearly 4,000 genes misexpressed in hybrids compared to X. muelleri. Conclusions/Significance Our results provide an important correlation between phenotypic characteristics of sperm and gene expression in sterile hybrid males. The broad pattern of gene misexpression suggests intriguing mechanisms creating the dominance pattern of the X. laevis genome in hybrids. These findings significantly contribute to growing evidence for allelic dominance in hybrids and have implications for the mechanism of species differentiation at the transcriptome level.

Malone, John H.; Chrzanowski, Thomas H.; Michalak, Pawel

2007-01-01

182

Molecular analysis of cytoplasmic male sterility in chives ( Allium schoenoprasum L.)  

Microsoft Academic Search

The mitochondria of chive plants with normal N or male-sterile S cytoplasms have been examined by restriction fragment analysis and Southern hybridizations of mitochondrial DNA (mtDNA) and in organello protein biosynthesis. Restriction fragment patterns of the mtDNA differed extensively between N-and S-cytoplasms. The percentage of fragments with different mobility varied between 44–48% depending on the restriction enzyme used. In contrast

H. Potz; T. Tatlioglu

1993-01-01

183

Molecular analysis of a new cytoplasmic male sterile genotype in sunflower  

Microsoft Academic Search

Mitochondrial DNA from 1 fertile and 6 cytoplasmic male sterile (CMS) sunflower genotypes was studied. The CMS genotypes had been obtained either by specific crosses between different Helianthus species or by mutagenesis. CMS-associated restriction fragment length polymorphisms (RFLPs) were found in the vicinity of the atpA locus, generated by various restriction enzymes. The organization of the mitochondrial genes 26S rRNA,

Mariana Spassova; Michail Christov; Natasha Bohorova; Peter Petrov; Kalin Dudov; Atanas Atanassov; H. John J. Nijkamp; Jaques Hille

1992-01-01

184

Genetic analyses and mapping of a new thermo-sensitive genic male sterile gene in maize  

Microsoft Academic Search

The present study describes a novel thermo-sensitive genic male sterile (TGMS) line, Qiong68ms. To analyse the mode of fertility inheritance and tag the TGMS gene, a set of F2, BC1 and F2:3 populations derived from a cross between Qiong68ms and K12 were evaluated for a period of 2 years. Classical genetic analyses and QTL mapping using the mean restoration percentage of

J. H. Tang; Z. Y. Fu; Y. M. Hu; J. S. Li; L. L. Sun; H. Q. Ji

2006-01-01

185

Metabolism of reactive oxygen species in cotton cytoplasmic male sterility and its restoration  

Microsoft Academic Search

To elucidate reactive oxygen species (ROS) metabolism of cotton cytoplasmic male sterility and the effects of restorer gene\\u000a on the metabolism of ROS, the metabolism changes in the production and scavenging of ROS and gene expression related to ROS-scavenging\\u000a enzymes were investigated in the anther mitochondria of CMS line, maintainer line and hybrid F1. During the abortion preliminary stage (sporogenous

Peidong Jiang; Xiaoquan Zhang; Yunguo Zhu; Wei Zhu; Haiyan Xie; Xuede Wang

2007-01-01

186

Chloroplast DNA variation in isonuclear male-sterile lines of Nicotiana  

Microsoft Academic Search

Chloroplast DNAs of six isonuclear malesterile tobacco lines and their respective parental species were analysed with the restriction endonuclease, EcoR1. Four of the lines had the same fragmentation pattern as their respective maternal species. Two lines had a pattern which was different to either parental species. The results show that nucleotide changes can occur in chloroplast DNA of isonuclear male-sterile

Rafael Frankel; William R. Scowcroft; Paul R. Whitfeld

1979-01-01

187

A unique sequence located downstream from the rice mitochondrial atp6 may cause male sterility  

Microsoft Academic Search

Asymmetric cell-fusion of the japonica cultivar ofOryza sativa (rice) with cytoplasmic-male-sterile (CMS) plants bearing cytoplasm derived from Chinsurah Boro II, resulted in two classes of cytoplasmic hybrids (cybrids), fertile and CMS. Southern-blot analysis of the mitochondrial DNA (mtDNA) indicates recombination events around a number of genes; however, the appearance of the CMS character is tightly correlated to reorganization around theatp6

Hiromori Akagi; Masahiro Sakamoto; Chou Shinjyo; Hiroaki Shimada; Tatsuhito Fujimura

1994-01-01

188

Asymmetric hybridization between cytoplasmic male-sterile (CMS) and fertile rice ( Oryza safiva L.) protoplasts  

Microsoft Academic Search

60Co-irradiated protoplasts of the cytoplasmic male-sterile line A-58 CMS (Oryza saliva L.) were electrofused with iodoacetamide (IOA)-treated protoplasts of the fertile (normal) rice cultivar ‘Fujiminori’. Seven of the colonies that formed were identified as cytoplasmic hybrids (cybrids): they all had the peroxidase isozymes of the fertile ‘Fujiminori’ parent, but contained four plasmid-like DNAs (Bl, B2, B3 and B4) from the

Z.-Q. Yang; T. Shikanai; Y. Yamada

1988-01-01

189

Identification of mitochondrial genome rearrangements unique to novel cytoplasmic male sterility in radish ( Raphanus sativus L.)  

Microsoft Academic Search

A novel cytoplasmic male-sterility (CMS) radish (Raphanus sativus L.) and its associated mitotype (DCGMS) were previously identified; however, no mtDNA fragments flanking the atp6 gene were found in the DCGMS mitotype. Unlike three other mitotypes in this study, a unique mtDNA organization, atp6–nad3–rps12, was found to be the major mtDNA structure associated with this mitotype. This organization may have arisen

Young-Pyo Lee; Sunggil Kim; Heerae Lim; YoungSoon Ahn; Soon-Kee Sung

2009-01-01

190

Treatment of homosexual and heterosexual sexual dysfunction in male-only groups of mixed sexual orientation  

Microsoft Academic Search

Males complaining of erectile and ejaculatory dysfunctions were treated in a structured therapy program. Twenty-one males of heterosexual, homosexual, or bisexual orientation were divided into five groups, with two male therapists for each group. Patients were those usually considered difficult to treat in that 16 had a primary sexual dysfunction with an average duration of 6 years. Extensive evaluations were

Walter Everaerd; Joost Dekker; Johan Dronkers; Kees van der Rhee; Joel Staffeleu; Guus Wiselius

1982-01-01

191

Mitochondrial DNA rearrangements and transcriptional alterations in the male-sterile cytoplasm of Ogura radish.  

PubMed Central

Maternally inherited mutations, such as cytoplasmic male sterility, provide useful systems in which to study the function of plant mitochondrial genomes and also their interaction with nuclear genes. We have studied the organization and expression of the organelle genomes of the male-sterile cytoplasm of Ogura radish and compared them with those of normal radish to identify alterations that might be involved in cytoplasmic male sterility. The chloroplast DNAs of Ogura and normal radish are virtually indistinguishable, whereas their mitochondrial DNAs are highly rearranged. Alignment of a restriction map constructed for the 257-kilobase Ogura mitochondrial genome with that published for the 242-kilobase genome of normal radish reveals that the two mitochondrial DNAs differ in arrangement by at least 10 inversions. The transcriptional patterns of several known mitochondrial genes and of rearranged mitochondrial sequences were examined in three nuclear backgrounds. Altered transcripts were observed for three mitochondrial genes, atpA, atp6, and coxI. Rearrangements map near each of these genes and therefore may be responsible for their transcriptional alterations. Radish nuclear genes that restore fertility to the Ogura cytoplasm have no effect on the atp6 and coxI transcripts, but do influence the atpA transcriptional pattern. Images

Makaroff, C A; Palmer, J D

1988-01-01

192

Transient Population Dynamics of Mosquitoes during Sterile Male Releases: Modelling Mating Behaviour and Perturbations of Life History Parameters  

PubMed Central

The release of genetically-modified or sterile male mosquitoes offers a promising form of mosquito-transmitted pathogen control, but the insights derived from our understanding of male mosquito behaviour have not fully been incorporated into the design of such genetic control or sterile-male release methods. The importance of aspects of male life history and mating behaviour for sterile-male release programmes were investigated by projecting a stage-structured matrix model over time. An elasticity analysis of transient dynamics during sterile-male releases was performed to provide insight on which vector control methods are likely to be most synergistic. The results suggest that high mating competitiveness and mortality costs of released males are required before the sterile-release method becomes ineffective. Additionally, if released males suffer a mortality cost, older males should be released due to their increased mating capacity. If released males are of a homogenous size and size-assortative mating occurs in nature, this can lead to an increase in the abundance of large females and reduce the efficacy of the population-suppression effort. At a high level of size-assortative mating, the disease transmission potential of the vector population increases due to male releases, arguing for the release of a heterogeneously-sized male population. The female population was most sensitive to perturbations of density-dependent components of larval mortality and female survivorship and fecundity. These findings suggest source reduction might be a particularly effective complement to mosquito control based on the sterile insect technique (SIT). In order for SIT to realize its potential as a key component of an integrated vector-management strategy to control mosquito-transmitted pathogens, programme design of sterile-male release programmes must account for the ecology, behaviour and life history of mosquitoes. The model used here takes a step in this direction and can easily be modified to investigate additional aspects of mosquito behaviour or species-specific ecology.

Stone, Christopher M.

2013-01-01

193

Cytoplasmic male sterility in petunia. I. Restoration of fertility with special reference to the influence of environment  

Microsoft Academic Search

A study was made of the restoration of fertility in cytoplasmic male sterile petunia. The fertility expression of plants with restorer genes in sterilizing cytoplasm proved quite dependent upon environmental conditions, especially temperature. In experiments with clones at a series of constant temperatures in the phytotron fertility appeared to follow an optimum curve, the position of the optimum and the

G. A. M. Marrewijk

1969-01-01

194

Using Bulked Extremes and Recessive Class to Map Genes for Photoperiod-Sensitive Genic Male Sterility in Rice  

Microsoft Academic Search

Photoperiod-sensitive genic male sterile (PSGMS) rice has a number of desirable characteristics for hybrid rice production. In this study we made use of a published rice genetic linkage map to determine the locations of PSGMS genes and we have characterized the effects of these genes on sterility by using molecular markers. A two-step approach was designed for mapping the genes:

Qifa Zhang; B. Z. Shen; X. K. Dai; M. H. Mei; M. A. Saghai Maroof; Z. B. Li

1994-01-01

195

Haldane's Rule and the Genetic Basis of Hybrid Male Sterility in Drosophila Simulans, Drosophila Mauritiana and Drosophila Sechellia  

Microsoft Academic Search

Genetic analysis of hybrid sterility and inviability has recently become a successful experimental approach to pursue the problem of speciation. In the present study, classical genetic analyses and high resolution two-dimensional gel electrophoresis (2DE) have been used to investigate the genetic basis of hybrid male sterility in three sibling species of the Drosophila melanogaster species subgroup. The genetic basis of

Ling-Wen Zeng

1993-01-01

196

The male sexual partners of adult versus teen women with sexually transmitted infections  

PubMed Central

Objectives We compared the male sexual partners of teen girls, age 15 - 19 years-old, currently infected with a sexually transmitted infection (STI) versus the male partners of adult women, age 20 - 41 years-old, with an STI to determine risk factors in these high-risk sexual dyads related to the male partner. Study Design Interview of 514 men who were partnered with 152 teen girls and 362 adult women, enrolled in Project Sexual Awareness for Everyone (SAFE), a randomized controlled trial of behavioral intervention to reduce recurrent STIs. Results Compared to the male partners of adult women, male partners of teen girls were significantly more likely (p < 0.05) to be infected with any STI at intake. Men partnered with teens were younger and had significantly more sexual partners per year sexually active, shorter relationship length, and shorter length of monogamy with the index girls. They were more likely to report that it was “really important” for the teen to have their baby (p = 0.04) and were slightly more likely to be the father of her children (p = 0.17). Young age independently predicted STI infection in men. Conclusions Although all women had an STI at intake, important differences were noted among the male partners of teens versus adults. Clinicians with similar populations may use this data to understand the characteristics of male partners of teens with STIs, in order to more effectively counsel adult and teen women on partner notification, treatment and STI prevention.

THURMAN, Andrea Ries; HOLDEN, Alan E C; SHAIN, Rochelle N; PERDUE, Sondra T.

2009-01-01

197

Increased sexual activity reduces male immune function in Drosophila melanogaster  

PubMed Central

Despite the benefits of resistance, susceptibility to infectious disease is commonplace. Although specific susceptibility may be considered an inevitable consequence of the co-evolutionary arms race between parasite and host, a more general constraint may arise from the cost of an immune response. This “cost” hypothesis predicts a tradeoff between immune defense and other components of fitness. In particular, a tradeoff between immunity and sexually selected male behavior has been proposed. Here we provide experimental support for the direct phenotypic tradeoff between sexual activity and immunity by studying the antibacterial immune response in Drosophila melanogaster. Males exposed to more females showed a reduced ability to clear a bacterial infection, an effect that we experimentally link to changes in sexual activity. Our results suggest immunosuppression is an important cost of reproduction and that immune function and levels of disease susceptibility will be influenced by sexual selection.

McKean, Kurt A.; Nunney, Leonard

2001-01-01

198

Erectile dysfunction: The medicalization of male sexuality  

Microsoft Academic Search

Erectile dysfunction (ED) is a highly prevalent disorder in males that increases markedly with aging. Diagnostic and treatment approaches for the disorder have proliferated in the past decade, along with increased understanding of the underlying physiology of male erection. Two specific themes have emerged in the recent literature on the topic: 1.(a) erectile dysfunction is a socially legitimate, medically treatable

Raymond C. Rosen

1996-01-01

199

Sexual Attractiveness of Males and Females.  

ERIC Educational Resources Information Center

The most important characteristics for females judging the attractiveness of males, and for males judging females, were eyes, body build and facial complexion. Previously, females tended to place less importance on physical components of attraction for both themselves and men. Possible interpretations are: (1) women have become more egalitarian…

Taylor, Peggy; And Others

200

Sexual Dysfunction and Pelvic Pain in Men: A Male Sexual Pain Disorder?  

Microsoft Academic Search

Male pelvic pain, often referred to as chronic prostatitis or chronic pelvic pain syndrome (CP\\/CPPS), is a common yet poorly understood problem, associated with significant sexual dysfunction. A critical review of the literature is presented, with specific attention to co-morbid sexual dysfunction. Recommendations for future multidisciplinary research and clinical work are also made.

Seth N. P. Davis; Yitzchak M. Binik; Serge Carrier

2009-01-01

201

An Exploration of Racial Differences in Deviant Sexual Interests Among Male Adolescent Sexual Offenders  

Microsoft Academic Search

In many research studies and findings from federal statistics, one of the few areas wherein African Americans are less overrepresented in incarcerated settings is for male juvenile sexual assault. In this study, using a large sample the authors hypothesized that perhaps this was due to less deviant sexual interest among these youth (as reported in prior studies) after controlling for

David L. Burton; Davida Ginsberg

2012-01-01

202

Male Child Sexual Abuse: A Phenomenology of Betrayal  

Microsoft Academic Search

Being deeply understood relies on the ability of the social work clinician to have authentic and genuine empathy for their\\u000a client. This phenomenological study sought to understand the lived experience of men sexually abused as boys in their childhood,\\u000a and what life is like for them as sexual abuse survivors in adulthood. Analyses of fourteen male survivors’ narratives into\\u000a the

Ramona Alaggia; Graeme Millington

2008-01-01

203

Representations of sexual abstinence among rural Nigerian adolescent males  

Microsoft Academic Search

This article reports on a study of representations and narratives of sexual abstinence among adolescent males in rural Nigeria\\u000a that showed that abstinence occupied a variable position in the lives and minds of these youth: Beliefs about sexual abstinence\\u000a being moral and healthy and signifying decency, propriety, and decorum existed alongside narratives depicting it both as dangerous\\u000a and unhealthy and

Chimaraoke Otutubikey Izugbara

2007-01-01

204

Haldane's Rule: Hybrid Sterility Affects the Heterogametic Sex First because Sexual Differentiation is on the Path to Species Differentiation  

Microsoft Academic Search

Prevention of recombination is needed to preserve both phenotypic differentiation between species and sexual phenotypic differentiation within species. For species differentiation (speciation), isolating barriers preventing recombination may be pre-zygotic (gamete transfer barriers), or post-zygotic (either a developmental barrier resulting in hybrid inviability, or a chromosomal-pairing barrier resulting in hybrid sterility). The sterility barrier is usually the first to appear and,

D. R. FORSDYKE

2000-01-01

205

Accessory Sexual Glands of Male 'Blattella germanica'.  

National Technical Information Service (NTIS)

Several synthetic juvenile hormones were applied topically and by injection to adult male Blattella germanica. These compounds included the Law synthetic juvenile hormone, the synthetic Roeller compound and farnesyl O-methyl ether. Mortalities were low up...

P. M. Fox

1973-01-01

206

A thermogenic secondary sexual character in male sea lamprey.  

PubMed

Secondary sexual characters in animals are exaggerated ornaments or weapons for intrasexual competition. Unexpectedly, we found that a male secondary sexual character in sea lamprey (Petromyzon marinus) is a thermogenic adipose tissue that instantly increases its heat production during sexual encounters. This secondary sexual character, developed in front of the anterior dorsal fin of mature males, is a swollen dorsal ridge known as the 'rope' tissue. It contains nerve bundles, multivacuolar adipocytes and interstitial cells packed with small lipid droplets and mitochondria with dense and highly organized cristae. The fatty acid composition of the rope tissue is rich in unsaturated fatty acids. The cytochrome c oxidase activity is high but the ATP concentration is very low in the mitochondria of the rope tissue compared with those of the gill and muscle tissues. The rope tissue temperature immediately rose up to 0.3°C when the male encountered a conspecific. Mature males generated more heat in the rope and muscle tissues when presented with a mature female than when presented with a male (paired t-test, P<0.05). On average, the rope generated 0.027±0.013 W cm(-3) more heat than the muscle in 10 min. Transcriptome analyses revealed that genes involved in fat cell differentiation are upregulated whereas those involved in oxidative-phosphorylation-coupled ATP synthesis are downregulated in the rope tissue compared with the gill and muscle tissues. Sexually mature male sea lamprey possess the only known thermogenic secondary sexual character that shows differential heat generation toward individual conspecifics. PMID:23804672

Chung-Davidson, Yu-Wen; Priess, M Cody; Yeh, Chu-Yin; Brant, Cory O; Johnson, Nicholas S; Li, Ke; Nanlohy, Kaben G; Bryan, Mara B; Brown, C Titus; Choi, Jongeun; Li, Weiming

2013-07-15

207

Influence of nuclear background on transcription of a maize mitochondrial region associated with Texas male sterile cytoplasm  

Microsoft Academic Search

Transcripts of the maize mitochondrial genes atp6, urf13-T and ORF25 were examined by Northern analysis from five normal (N), Texas male sterile (T), and T male sterile cytoplasm lines restored to fertility. A 5 kb DNA region containing the atp6 promoter is duplicated 5' to urf13-T and ORF25 in T cytoplasm. DNA sequence differences in the 5 kb repeat detected

J. C. Kennell; R. P. Wise; D. R. Pring

1987-01-01

208

Characterization of the radish mitochondrial orfB locus: possible relationship with male sterility in Ogura radish  

Microsoft Academic Search

The orfB locus of the normal (fertile) and Ogura (male-sterile) radish mitochondrial genomes has been characterized in order to determine if this region, which has previously been correlated with cytoplasmic male sterility (CMS) in Brassica napus cybrids (Bonhomme et al. 1991; Temple et al. 1992), could also be involved in radish CMS. In normal radish, orfB is expressed as a

Subbiah Krishnasamy; Christopher A. Makaroff

1993-01-01

209

Organ-specific reduction in the abundance of a mitochondrial protein accompanies fertility restoration in cytoplasmic male-sterile radish  

Microsoft Academic Search

The mitochondrial DNA of plants containing the male sterility-causing Ogura cytoplasm of radish contain a novel gene, orf138, that is transcribed as part of a bicistronic mRNA. Genetic studies have previously linked male sterility with the orf138 locus. To determine if orf138 is expressed at the protein level, and investigate the effect of fertility restoration on ORF138 levels, we have

Subbiah Krishnasamy; Christopher A. Makaroff

1994-01-01

210

Effect of potassium channel modulators on male sexual behavior.  

PubMed

In the adult sexually experienced male rat, the intracerebroventricular (i.c.v.) injection of pinacidil, a KATP channel opener, at the dose of 100-150-300 micrograms/rat worsened the copulatory performance in the presence of a receptive female, whereas the administration of glibenclamide, a KATP channel blocker, at the dose of 0.5 and 3 mg/kg intraperitoneally (i.p.) had an improving effect. These data indicate that KATP channels in target neurons may play an important role in the physiology of male sexual behavior. PMID:9010481

Benelli, A; Arletti, R; Poggioli, R; Cavazzuti, E; Mameli, M; Bertolini, A

1997-01-01

211

Intron hairpin and transitive RNAi mediated silencing of orf H522 transcripts restores male fertility in transgenic male sterile tobacco plants expressing orf H522  

Microsoft Academic Search

The present work was aimed at developing vector construct(s) suitable for restoring fertility in transgenic male sterile tobacco\\u000a plants expressing male-sterility-inducing ORFH522 in tapetal cell layer (Nizampatnam et al. Planta 229:987–1001, 2009). PTGS vectors that could produce either intron spliced hairpin RNA against the orfH522 or induce silencing of orfH522 by heterologous 3?UTR region were developed using the selected 316 bp

Narasimha Rao Nizampatnam; Viswanathaswamy Dinesh Kumar

212

A mitochondrial protein associated with cytoplasmic male sterility in the T cytoplasm of maize  

PubMed Central

Mitochondrial DNA in the T male-sterile cytoplasm (cms-T) of maize contains an open reading frame (ORF 13) associated with the T type of sterility. Antibodies raised to a chemically synthesized oligopeptide corresponding to ORF 13 were used to establish the expression of a 13-kDa protein from this reading frame. The 13-kDa polypeptide is synthesized uniquely in cms-T maize and purifies with the membrane fraction of T mitochondria. We assign the symbol urf13-T to designate this mitochondrial gene. Presence of the nuclear restorer gene Rf1 in cms-T plants results in a decrease in abundance of 13-kDa protein and alteration in the transcripts of urf13-T. Images

Dewey, R. E.; Timothy, D. H.; Levings, C. S.

1987-01-01

213

Childhood sexual history of 20 male pedophiles vs. 24 male healthy control subjects.  

PubMed

Despite the widespread incidence of childhood sexual abuse, there is insufficient investigation into the childhood sexual history of perpetrators. In addition, there is little published on the specific similarities between childhood and adult sexual histories. The present study investigates the incidence of childhood sexual abuse in a carefully characterized sample of male pedophiles compared with a demographically similar control group. Concordance between and cognitive distortions about characteristics of childhood abuse and pedophilic behavior are also studied. Twenty men with pedophilia, heterosexual type were compared with 24 demographically similar, healthy male control subjects on a questionnaire specifically designed to assess childhood sexual history in pedophiles. Sixty percent of pedophiles compared with 4% of control subjects reported adult sexual advances as a child. Seventy-five percent of pedophiles and 22% of control subjects reported a first sexual encounter before age 14 years. About 60% concordance was found between acts experienced as a child and perpetrated as an adult. Finally, numerous inconsistencies throughout the questionnaire add preliminary support for the role of cognitive distortions with regard to childhood and adult sexual history. The present findings replicate the elevated rate of childhood sexual abuse found among pedophiles and are consistent with the notion of a causative relationship between early childhood abuse and later pedophilic behavior. PMID:12436016

Cohen, Lisa J; McGeoch, Pamela G; Gans, Sniezyna Watras; Nikiforov, Konstantin; Cullen, Ken; Galynker, Igor I

2002-11-01

214

Analysis of Cytoplasmic Effects and Fine-Mapping of a Genic Male Sterile Line in Rice  

PubMed Central

Cytoplasm has substantial genetic effects on progeny and is important for yield improvement in rice breeding. Studies on the cytoplasmic effects of cytoplasmic male sterility (CMS) show that most types of CMS have negative effects on yield-related traits and that these negative effects vary among CMS. Some types of genic male sterility (GMS), including photo-thermo sensitive male sterility (PTMS), have been widely used in rice breeding, but the cytoplasmic effects of GMS remain unknown. Here, we identified a GMS mutant line, h2s, which exhibited small, white anthers and failed to produce mature pollen. Unlike CMS, the h2s had significant positive cytoplasmic effects on the seed set rate, weight per panicle, yield, and general combining ability (GCA) for plant height, seed set rate, weight per panicle, and yield. These effects indicated that h2s cytoplasm may show promise for the improvement of rice yield. Genetic analysis suggested that the phenotype of h2s was controlled by a single recessive locus. We mapped h2s to a 152 kb region on chromosome 6, where 22 candidate genes were predicted. None of the 22 genes had previously been reported to be responsible for the phenotypes of h2s. Sequencing analysis showed a 12 bp deletion in the sixth exon of Loc_Os06g40550 in h2s in comparison to wild type, suggesting that Loc_Os06g40550 is the best candidate gene. These results lay a strong foundation for cloning of the H2S gene to elucidate the molecular mechanism of male reproduction.

Li, Yuanyuan; Ma, Bingtian; Li, Shigui

2013-01-01

215

Analysis of cytoplasmic effects and fine-mapping of a genic male sterile line in rice.  

PubMed

Cytoplasm has substantial genetic effects on progeny and is important for yield improvement in rice breeding. Studies on the cytoplasmic effects of cytoplasmic male sterility (CMS) show that most types of CMS have negative effects on yield-related traits and that these negative effects vary among CMS. Some types of genic male sterility (GMS), including photo-thermo sensitive male sterility (PTMS), have been widely used in rice breeding, but the cytoplasmic effects of GMS remain unknown. Here, we identified a GMS mutant line, h2s, which exhibited small, white anthers and failed to produce mature pollen. Unlike CMS, the h2s had significant positive cytoplasmic effects on the seed set rate, weight per panicle, yield, and general combining ability (GCA) for plant height, seed set rate, weight per panicle, and yield. These effects indicated that h2s cytoplasm may show promise for the improvement of rice yield. Genetic analysis suggested that the phenotype of h2s was controlled by a single recessive locus. We mapped h2s to a 152 kb region on chromosome 6, where 22 candidate genes were predicted. None of the 22 genes had previously been reported to be responsible for the phenotypes of h2s. Sequencing analysis showed a 12 bp deletion in the sixth exon of Loc_Os06g40550 in h2s in comparison to wild type, suggesting that Loc_Os06g40550 is the best candidate gene. These results lay a strong foundation for cloning of the H2S gene to elucidate the molecular mechanism of male reproduction. PMID:23613915

Qin, Peng; Wang, Yuping; Li, Yuanyuan; Ma, Bingtian; Li, Shigui

2013-04-16

216

D-glufosinate as a male sterility agent for hybrid seed production.  

PubMed

A chemical male sterility system based on anther-localized conversion of the inactive D-enantiomer of the herbicide, glufosinate (2-amino-4-(methylphosphinyl)-butanoate) to the phytotoxic L is described. Highly pure D-glufosinate was isolated in >98% enantiomeric excess from the racemate via fermentation with a strain of Escherichia coli expressing the PAT (L-glufosinate N-acetyl transferase) gene and purification of the unreacted D-enantiomer from the broth by ion exchange. A modified (F58K, M213S) form of the D-amino acid oxidase (DAAO) (EC 1.4.3.3) from Rhodosporidium toruloides was designed, tested in vitro and found to efficiently oxidize D-glufosinate to its 2-oxo derivative [2-oxo-4-(methylphosphinyl)-butanoic acid]. Tobacco (Nicotiana tabacum) plants were transformed to express this modified oxidase under control of the TAP1 tapetum-specific promoter. A number of the resultant transgenic lines exhibited complete male sterility that persisted for two or more weeks immediately following foliar treatment with 75 or 200 g/ha of D-glufosinate without exhibiting obvious phytotoxic symptoms or any measurable decline in female fertility. Similarly, plants containing the same construct and, additionally, a PAT gene expressed from a plastocyanin promoter exhibited significantly reduced male fertility and no reduction in female fertility following foliar application of racemic glufosinate. Thus, foliar application of d-glufosinate either purified or as the commercial herbicide, combined with anther expression of a modified DAAO promises to provide a cost-effective conditional chemical male sterility system with the characteristics necessary for practical F? hybrid seed production. PMID:20678098

Hawkes, Tim; Pline-Srnic, Wendy; Dale, Richard; Friend, Emma; Hollinshead, Tricia; Howe, Peter; Thompson, Paul; Viner, Russell; Greenland, Andy

2011-04-01

217

Male-Male Sexual Behavior in the Parasitic Wasp Psyttalia concolor  

PubMed Central

The role of male-male courtship in parasitic Hymenoptera is poorly known. A laboratory study was conducted to assess if Psyttalia concolor (Szépligeti) (Hymenoptera: Braconidae) male courtship can be affected by a previous experience in courting young conspecifics of both sexes. Two experiments were performed to evaluate the effect of experience in courting young wasps on both male courtship and male-male competition behavior. Results showed that a courting experience on both sexes can modify some sexual traits in a P. concolor male, without affecting its success in mating. When approaching virgin females, a P. concolor male that had a previous courtship experience with young wasps of either sex showed shorter latency times, more wing fanning, and longer courtship durations with respect to the control male. The hypothesis that a previous courting experience may allow a P. concolor male to refine its courtship behavior and to enhance courtship intensity in subsequent encounters with females was discussed.

Benelli, Giovanni; Canale, Angelo

2013-01-01

218

Male-male sexual behavior in the parasitic wasp Psyttalia concolor.  

PubMed

The role of male-male courtship in parasitic Hymenoptera is poorly known. A laboratory study was conducted to assess if Psyttalia concolor (Szépligeti) (Hymenoptera: Braconidae) male courtship can be affected by a previous experience in courting young conspecifics of both sexes. Two experiments were performed to evaluate the effect of experience in courting young wasps on both male courtship and male-male competition behavior. Results showed that a courting experience on both sexes can modify some sexual traits in a P. concolor male, without affecting its success in mating. When approaching virgin females, a P. concolor male that had a previous courtship experience with young wasps of either sex showed shorter latency times, more wing fanning, and longer courtship durations with respect to the control male. The hypothesis that a previous courting experience may allow a P. concolor male to refine its courtship behavior and to enhance courtship intensity in subsequent encounters with females was discussed. PMID:23895402

Benelli, Giovanni; Canale, Angelo

2013-01-01

219

Sexual HIV risk among gay and bisexual male methamphetamine abusers  

Microsoft Academic Search

The current report examined HIV-related high risk sexual behaviors among a small sample of gay and bisexual male methamphetamine abusers in Los Angeles. Participants were 16 methamphetamine-abusing or -dependent gay or bisexual males who participated in a treatment demonstration project between 1989 and 1993. All participants completed the NIDA\\/WAVE survey, a detailed inventory of HIV-related risk behaviors. Findings indicate a

Dominick Frosch; Steven Shoptaw; Alice Huber; Richard A. Rawson; Walter Ling

1996-01-01

220

OPERATIONAL SEX RATIO AND DENSITY DO NOT AFFECT DIRECTIONAL SELECTION ON MALE SEXUAL ORNAMENTS AND BEHAVIOR  

Microsoft Academic Search

Demographic parameters including operational sex ratio (OSR) and population density may influence the opportunity for, and strength of sexual selection. Traditionally, male-biased OSRs and high population densities have been thought to increase the opportunity for sexual selection on male sexual traits due to increased male competition for mates. Recent experimental evidence, however, suggests that male-biased OSRs might reduce the opportunity

Megan L. Head; Anna K. Lindholm; Robert Brooks

2007-01-01

221

Identification of mitochondrial genome rearrangements unique to novel cytoplasmic male sterility in radish (Raphanus sativus L.).  

PubMed

A novel cytoplasmic male-sterility (CMS) radish (Raphanus sativus L.) and its associated mitotype (DCGMS) were previously identified; however, no mtDNA fragments flanking the atp6 gene were found in the DCGMS mitotype. Unlike three other mitotypes in this study, a unique mtDNA organization, atp6-nad3-rps12, was found to be the major mtDNA structure associated with this mitotype. This organization may have arisen from short repeat sequence-mediated recombination events. The short repeat clusters involved in the mtDNA rearrangement around the atp6 gene also exist as repetitive sequences in the complete mitochondrial genomes of other members of the Brassicaceae family, including rapeseed and Arabidopsis. These sequences do not exist as repetitive elements in the mtDNA of tobacco, sugar beet, or rice. While studying the regions flanking atp6, we identified a truncated atp6 mtDNA fragment which consists of the 5' part of the atp6 gene linked to an unidentified sequence. This mtDNA structure was present in all mitotypes; however, a single nucleotide insertion mutation leading to a frame-shift was identified only in the DCGMS mitotype. Although this truncated atp6 organization was transcribed, there was no significantly different expression between male-sterile and fertile segregating individuals from the BC(1)F(1) population originating from a cross between male-sterile and restorer parents. Comprehensive survey of the single base-pair insertion showed that it was maternally inherited and unique to the DCGMS mitotype. Therefore, this single nucleotide polymorphism (SNP) in the coding sequence of the mtDNA will be a useful molecular marker for the detection of the DCGMS mitotype. PMID:19034407

Lee, Young-Pyo; Kim, Sunggil; Lim, Heerae; Ahn, Youngsoon; Sung, Soon-Kee

2008-11-26

222

Darcin: a male pheromone that stimulates female memory and sexual attraction to an individual male's odour  

PubMed Central

Background Among invertebrates, specific pheromones elicit inherent (fixed) behavioural responses to coordinate social behaviours such as sexual recognition and attraction. By contrast, the much more complex social odours of mammals provide a broad range of information about the individual owner and stimulate individual-specific responses that are modulated by learning. How do mammals use such odours to coordinate important social interactions such as sexual attraction while allowing for individual-specific choice? We hypothesized that male mouse urine contains a specific pheromonal component that invokes inherent sexual attraction to the scent and which also stimulates female memory and conditions sexual attraction to the airborne odours of an individual scent owner associated with this pheromone. Results Using wild-stock house mice to ensure natural responses that generalize across individual genomes, we identify a single atypical male-specific major urinary protein (MUP) of mass 18893Da that invokes a female's inherent sexual attraction to male compared to female urinary scent. Attraction to this protein pheromone, which we named darcin, was as strong as the attraction to intact male urine. Importantly, contact with darcin also stimulated a strong learned attraction to the associated airborne urinary odour of an individual male, such that, subsequently, females were attracted to the airborne scent of that specific individual but not to that of other males. Conclusions This involatile protein is a mammalian male sex pheromone that stimulates a flexible response to individual-specific odours through associative learning and memory, allowing female sexual attraction to be inherent but selective towards particular males. This 'darcin effect' offers a new system to investigate the neural basis of individual-specific memories in the brain and give new insights into the regulation of behaviour in complex social mammals. See associated Commentary http://www.biomedcentral.com/1741-7007/8/71

2010-01-01

223

Young Male Prostitutes: Their Knowledge of Selected Sexually Transmitted Diseases.  

ERIC Educational Resources Information Center

Conducted unstructured interviews with 18 male street prostitutes between the ages of 13 and 22 to determine the extent of accurate knowledge they possessed concerning four common sexually transmitted diseases. Found that subjects possessed more factual information on gonorrhea and syphilis than on herpes and Acquired Immune Deficiency Syndrome.…

Calhoun, Thomas; Pickerill, Brian

1988-01-01

224

Correlates of Sexual Aggression among Male University Students.  

ERIC Educational Resources Information Center

|Examines the relationship between sexual aggression and the variables of sex role stereotyping, fraternity affiliation, participation in athletics, hostility toward women, aggressive driving, aggressive attitudes, alcohol use, and masculinity. Findings from 86 male undergraduates reveal physical aggression, sex role stereotyping, and fraternity…

Lackie, Leandra; de Man, Anton F.

1997-01-01

225

Childhood Abuse and Prelimitary Sexual Assault in Male Navy Recruits.  

National Technical Information Service (NTIS)

Three samples of male Navy recruits (Total N = 7,850) were surveyed to determine whether a history of childhood physical abuse (CPA) and/or sexual abuse (CSA) was predictive of premilitary female rape, and whether these relationships were mediated by alco...

L. L. Merrill C. J. Thomsen S. R. Gold J. S. Miller

2000-01-01

226

Photoperiodic Influences on Sexual Behavior in Male Syrian Hamsters  

Microsoft Academic Search

The effect of photoperiodic conditions on sexual behavior was investigated in male Syrian hamsters that were either gonadally intact, or castrated and treated with low doses of testosterone throughout the experiment. Hamsters were exposed to long (LD 16:8) or short (LD 8:16) days for 7 weeks; for the next 8 weeks, either they were exposed to an intermediate daylength (LD

J. B. Powers; E. A. Steel; J. B. Hutchison; M. H. Hastings; J. Herbert; A. P. Walker

1989-01-01

227

Correlates of Sexual Aggression among Male University Students.  

ERIC Educational Resources Information Center

Examines the relationship between sexual aggression and the variables of sex role stereotyping, fraternity affiliation, participation in athletics, hostility toward women, aggressive driving, aggressive attitudes, alcohol use, and masculinity. Findings from 86 male undergraduates reveal physical aggression, sex role stereotyping, and fraternity…

Lackie, Leandra; de Man, Anton F.

1997-01-01

228

Partition test and sexual motivation in male mice  

Microsoft Academic Search

Theoretical analysis of own and literature investigations of sexual motivation with the use of the partition test [Kudryavtseva, 1987, 1994] in male mice was carried out. It has been shown that appearance of a receptive female in the neighboring compartment of common cage separated by perforated transparent partition produces the enhancement of testosterone level in blood and stimulates the behavioral

N. N. Kudryavtseva

2007-01-01

229

Epistasis modifies the dominance of loci causing hybrid male sterility in the Drosophila pseudoobscura species group.  

PubMed

Speciation, the evolution of reproductive isolation between populations, serves as the driving force for generating biodiversity. Postzygotic barriers to gene flow, such as F(1) hybrid sterility and inviability, play important roles in the establishment and maintenance of biological species. F(1) hybrid incompatibilities in taxa that obey Haldane's rule, the observation that the heterogametic sex suffers greater hybrid fitness problems than the homogametic sex, are thought to often result from interactions between recessive-acting X-linked loci and dominant-acting autosomal loci. Because they play such prominent roles in producing hybrid incompatibilities, we examine the dominance and nature of epistasis between alleles derived from Drosophila persimilis that confer hybrid male sterility in the genetic background of its sister species, D. pseudoobscura bogotana. We show that epistasis elevates the apparent dominance of individually recessive-acting QTL such that they can contribute to F(1) hybrid sterility. These results have important implications for assumptions underlying theoretical models of hybrid incompatibilities and may offer a possible explanation for why, to date, identification of dominant-acting autosomal "speciation genes" has been challenging. PMID:19686263

Chang, Audrey S; Noor, Mohamed A F

2009-08-17

230

Adult Male Circumcision: Effects on Sexual Function and Sexual Satisfaction in Kisumu, Kenya  

PubMed Central

Introduction Male circumcision is being promoted for HIV prevention in high-risk heterosexual populations. However, there is a concern that circumcision may impair sexual function. Aim To assess adult male circumcision’s effect on men’s sexual function and pleasure. Methods Participants in a controlled trial of circumcision to reduce HIV incidence in Kisumu, Kenya were uncircumcised, HIV negative, sexually active men, aged 18–24 years, with a hemoglobin ?9.0 mmol/L. Exclusion criteria included foreskin covering less than half the glans, a condition that might unduly increase surgical risks, or a medical indication for circumcision. Participants were randomized 1:1 to either immediate circumcision or delayed circumcision after 2 years (control group). Detailed evaluations occurred at 1, 3, 6, 12, 18, and 24 months. Main Outcome Measures (i) Sexual function between circumcised and uncircumcised men; and (ii) sexual satisfaction and pleasure over time following circumcision. Results Between February 2002 and September 2005, 2,784 participants were randomized, including the 100 excluded from this analysis because they crossed over, were not circumcised within 30 days of randomization, did not complete baseline interviews, or were outside the age range. For the circumcision and control groups, respectively, rates of any reported sexual dysfunction decreased from 23.6% and 25.9% at baseline to 6.2% and 5.8% at month 24. Changes over time were not associated with circumcision status. Compared to before they were circumcised, 64.0% of circumcised men reported their penis was “much more sensitive,” and 54.5% rated their ease of reaching orgasm as “much more” at month 24. Conclusions Adult male circumcision was not associated with sexual dysfunction. Circumcised men reported increased penile sensitivity and enhanced ease of reaching orgasm. These data indicate that integration of male circumcision into programs to reduce HIV risk is unlikely to adversely effect male sexual function.

Krieger, John N.; Mehta, Supriya D.; Bailey, Robert C.; Agot, Kawango; Ndinya-Achola, Jeckoniah O.; Parker, Corette; Moses, Stephen

2010-01-01

231

Male sexual harassment alters female social behaviour towards other females.  

PubMed

Male harassment of females to gain mating opportunities is a consequence of an evolutionary conflict of interest between the sexes over reproduction and is common among sexually reproducing species. Male Trinidadian guppies Poecilia reticulata spend a large proportion of their time harassing females for copulations and their presence in female social groups has been shown to disrupt female-female social networks and the propensity for females to develop social recognition based on familiarity. In this study, we investigate the behavioural mechanisms that may lead to this disruption of female sociality. Using two experiments, we test the hypothesis that male presence will directly affect social behaviours expressed by females towards other females in the population. In experiment one, we tested for an effect of male presence on female shoaling behaviour and found that, in the presence of a free-swimming male guppy, females spent shorter amounts of time with other females than when in the presence of a free-swimming female guppy. In experiment two, we tested for an effect of male presence on the incidence of aggressive behaviour among female guppies. When males were present in a shoal, females exhibited increased levels of overall aggression towards other females compared with female only shoals. Our work provides direct evidence that the presence of sexually harassing males alters female-female social behaviour, an effect that we expect will be recurrent across taxonomic groups. PMID:21976624

Darden, Safi K; Watts, Lauren

2011-10-05

232

Male sexual harassment alters female social behaviour towards other females  

PubMed Central

Male harassment of females to gain mating opportunities is a consequence of an evolutionary conflict of interest between the sexes over reproduction and is common among sexually reproducing species. Male Trinidadian guppies Poecilia reticulata spend a large proportion of their time harassing females for copulations and their presence in female social groups has been shown to disrupt female–female social networks and the propensity for females to develop social recognition based on familiarity. In this study, we investigate the behavioural mechanisms that may lead to this disruption of female sociality. Using two experiments, we test the hypothesis that male presence will directly affect social behaviours expressed by females towards other females in the population. In experiment one, we tested for an effect of male presence on female shoaling behaviour and found that, in the presence of a free-swimming male guppy, females spent shorter amounts of time with other females than when in the presence of a free-swimming female guppy. In experiment two, we tested for an effect of male presence on the incidence of aggressive behaviour among female guppies. When males were present in a shoal, females exhibited increased levels of overall aggression towards other females compared with female only shoals. Our work provides direct evidence that the presence of sexually harassing males alters female–female social behaviour, an effect that we expect will be recurrent across taxonomic groups.

Darden, Safi K.; Watts, Lauren

2012-01-01

233

Effects of rootstocks on cryotolerance and overwintering survivorship of genic male sterile lines in upland cotton (Gossypium hirsutum L.).  

PubMed

Grafting desirable scion on stress-tolerant rootstocks provides an opportunity to improve the cryotolerance of scion. Genic male sterile (GMS) lines of plant could be used as sterile line and maintainer in breeding, and they have the conspicuous characteristics that the fertility of which is easy to regain but hard to maintain by sexual reproduction. In order to maintain the fertility of GMS cotton by means of its perennial growth on the basis of frostless winters in Nanning, Guangxi autonomous region, GMS line A4 was grafted onto 7 cryotolerant rootstocks (F118, F697, F098, F112, F113, P098 and P113), and the cryotolerance and the overwintering survivorship of scions were investigated. In consequence, when compared with control (self-grafted A4), the relative conductivity of the grafted plants in shoot bark was reduced (8.80%), the content of soluble sugar, soluble protein and free proline were higher, 25.00, 1.55, 3.46%, respectively; the overwintering survival rate and the height of regeneration bud under field condition of grafted plants were higher, 10.44, 15.75%, respectively; the order of the grafted plants based on the average subordinate function value of overwintering survivorship was A4/F113>A4/F118>A4/F098>A4/F697>A4/F112>A4/P098>A4/P113>A4/A4(CK); the correlation analyses indicated that the physiological parameters of cryotolerance could be used for forecasting the overwintering survivorship, and the relative conductivity could be chosen as the first physiological parameter for forecasting cryotolerance or overwintering survivorship. The results indicate that the cryotolerance and the overwintering survivorship of GMS cotton could be improved by grafting, and F113 appeared to be a valuable rootstock. PMID:23667634

Zhang, Xin; Zhang, Zhiyong; Wang, Qinglian; Chen, Peng; Chen, Guoping; Zhou, Ruiyang

2013-05-07

234

Effects of Rootstocks on Cryotolerance and Overwintering Survivorship of Genic Male Sterile Lines in Upland Cotton (Gossypium hirsutum L.)  

PubMed Central

Grafting desirable scion on stress-tolerant rootstocks provides an opportunity to improve the cryotolerance of scion. Genic male sterile (GMS) lines of plant could be used as sterile line and maintainer in breeding, and they have the conspicuous characteristics that the fertility of which is easy to regain but hard to maintain by sexual reproduction. In order to maintain the fertility of GMS cotton by means of its perennial growth on the basis of frostless winters in Nanning, Guangxi autonomous region, GMS line A4 was grafted onto 7 cryotolerant rootstocks (F118, F697, F098, F112, F113, P098 and P113), and the cryotolerance and the overwintering survivorship of scions were investigated. In consequence, when compared with control (self-grafted A4), the relative conductivity of the grafted plants in shoot bark was reduced (8.80%), the content of soluble sugar, soluble protein and free proline were higher, 25.00, 1.55, 3.46%, respectively; the overwintering survival rate and the height of regeneration bud under field condition of grafted plants were higher, 10.44, 15.75%, respectively; the order of the grafted plants based on the average subordinate function value of overwintering survivorship was A4/F113>A4/F118>A4/F098>A4/F697>A4/F112>A4/P098>A4/P113>A4/A4(CK); the correlation analyses indicated that the physiological parameters of cryotolerance could be used for forecasting the overwintering survivorship, and the relative conductivity could be chosen as the first physiological parameter for forecasting cryotolerance or overwintering survivorship. The results indicate that the cryotolerance and the overwintering survivorship of GMS cotton could be improved by grafting, and F113 appeared to be a valuable rootstock.

Zhang, Xin; Zhang, Zhiyong; Wang, Qinglian; Chen, Peng; Chen, Guoping; Zhou, Ruiyang

2013-01-01

235

Straight Wives of HIV-Positive Husbands Who Contracted the Virus Through Male-to-Male Sexual Contact  

Microsoft Academic Search

This phenomenological study explores the experience of eight monogamous, heterosexual women whose husbands have been diagnosed as HIV positive as a result of male-to-male sexual contact. The women were not aware of the sexual orientation of their husbands nor that they had engaged in extramarital relations. The ramifications of the revelations of both the sexual orientation and the HIV status

Charlotte M. Klaar

2012-01-01

236

A recessive gene controlling male sterility sensitive to short daylength/low temperature in wheat (Triticum aestivum L.)*  

PubMed Central

Utilization of a two-line breeding system via photoperiod-thermo sensitive male sterility has a great potential for hybrid production in wheat (Triticum aestivum L.). 337S is a novel wheat male sterile line sensitive to both short daylength/low temperature and long daylength/high temperature. Five F2 populations derived from the crosses between 337S and five common wheat varieties were developed for genetic analysis. All F1’s were highly fertile while segregation occurred in the F2 populations with a ratio of 3 fertile:1 sterile under short daylength/low temperature. It is shown that male sterility in 337S was controlled by a single recessive gene, temporarily designated as wptms3. Bulked segregant analysis (BSA) coupled with simple sequence repeat (SSR) markers was applied to map the sterile gene using one mapping population. The wptms3 gene was mapped to chromosome arm 1BS and flanked by Xgwm413 and Xgwm182 at a genetic distance of 3.2 and 23.5 cM, respectively. The accuracy and efficiency of marker-assisted selection were evaluated and proved essential for identifying homozygous recessive male sterile genotypes of the wptms3 gene in F2 generation.

Chen, Xiao-dong; Sun, Dong-fa; Rong, De-fu; Peng, Jun-hua; Li, Cheng-dao

2011-01-01

237

Sexual health knowledge, sexual relationships and condom use among male trekking guides in Nepal: a qualitative study  

Microsoft Academic Search

People in Nepal generally hold fairly traditional views about sex and sexual health, whilst Western tourists often have a more liberal approach towards sex and relationships. There is evidence that significant sexual interaction occurs between male trekking guides and female travellers and\\/or local female sex workers in Nepal. This qualitative study explored trekking guides' sexual health knowledge, sexual relationships and

Padam Simkhada; Edwin R. van Teijlingen; Pramod R. Regmi; Prakash Bhatta

2010-01-01

238

Psychometrics and Comparison of the Compulsive Sexual Behavior Inventory and the Sexual Compulsivity Scale in a Male College Student Sample  

Microsoft Academic Search

The current study examined and compared the psychometric properties of the Sexual Compulsivity Scale and the Compulsive Sexual Behavior Inventory in male college students. Participants included 334 male undergraduate students enrolled in Introductory Psychology courses. Zero-order correlation analyses were conducted and statistically compared to identify sexual behaviors and constructs significantly and differentially related to scores on the CSBI and SCS.

Tayla T. C. Lee; Kristin A. Ritchey; Johnathan D. Forbey; George A. Gaither

2009-01-01

239

Photoperiodic influences on sexual behavior in male Syrian hamsters.  

PubMed

The effect of photoperiodic conditions on sexual behavior was investigated in male Syrian hamsters that were either gonadally intact, or castrated and treated with low doses of testosterone throughout the experiment. Hamsters were exposed to long (LD 16:8) or short (LD 8:16) days for 7 weeks; for the next 8 weeks, either they were exposed to an intermediate daylength (LD 12:12), or daylength conditions remained unchanged. Sexual behavior was affected by photoperiod conditions in both gonadally intact animals and testosterone-treated castrates, but to different degrees. Intact males exposed to short days for 15 weeks exhibited gonadal regression, and their copulatory performance was impaired. The percentage of animals that intromitted or ejaculated was significantly reduced. Additional measures of sexual performance among the copulating males were also affected. In contrast, among the castrates with testosterone clamped at low but stable levels, the proportion of males that mounted, intromitted, or ejaculated was not affected by photoperiod. However, among the males that continued to copulate, sexual performance changes were present in the short-day castrates that resembled those displayed by the intact males. We infer that these behavioral effects in both hormonal conditions reflect primarily a difficulty in the attainment of intromission. Gonadal regression alone cannot easily account for the behavioral deficits of the intact males, because circulating testosterone levels at the end of the experiment were not significantly different between the gonadally intact hamsters and the castrated, testosterone-treated hamsters exposed continuously to short days. Males transferred from either long or short days to the intermediate-daylength condition responded behaviorally to this photoperiod as if it were a short day, that is, their ejaculatory frequency declined. We conclude that male hamsters exposed to photoinhibitory daylengths exhibit deficits in their sexual behavior, not only because endogenous levels of testosterone decrease, but also because the substrates on which this hormone acts become less responsive. We hypothesize that under physiological conditions, the episodic secretion of testosterone imposes constraints on the maintenance or restoration of copulation, and that the potent behavioral effects achieved by constant-release implants of testosterone may mask the presence of photoperiodically induced alterations in the hamster's sensitivity to this gonadal hormone. PMID:2519581

Powers, J B; Steel, E A; Hutchison, J B; Hastings, M H; Herbert, J; Walker, A P

1989-01-01

240

Further aspects of male-on-male rape and sexual assault in greater Manchester.  

PubMed

The purpose of this paper is to describe pertinent non-medical circumstances around male-on-male sexual assault, and supplements the earlier article in this journal regarding forensic medical aspects of this population. As services (medical, policing and judicial) see more males they will need to adapt themselves to their needs as well as those of their female clients. St. Mary's Sexual Assault Referral Centre (Greater Manchester, UK) opened in October 1986. Up to May 2003 it had seen 376 male (370 individual clients) and 7,789 female cases (7,403 clients). Of these, significantly fewer males reported to the police than females, although this difference has disappeared in recent years. There were also significant differences between the sexes regarding relationship, number of assailants, and assault location. There were no statistically significant differences between the sexes for age of the client, and presence in the assault of weapons or additional violence. PMID:16117283

McLean, Iain A; Balding, Val; White, Cath

2005-07-01

241

Molecular mapping of 2 environmentally sensitive male-sterile mutants in soybean.  

PubMed

In soybean [Glycine max (L.) Merr.], manual cross-pollination to produce large quantities of hybrid seed is difficult and time consuming. Identification of an environmentally stable male-sterility system could make hybrid seed production commercially valuable. In soybean, 2 environmentally sensitive male-sterile, female-fertile mutants (ms8 and msp) have been identified. Inheritance studies showed that sterility in both mutants is inherited as a single gene. The objectives of this study were to 1) confirm that msp and ms8 are independent genes; 2) identify the soybean chromosomes that contain the msp and the ms8 genes using bulked segregant analyses (BSAs); and 3) make a genetic linkage map of the regions containing these genes. Mapping populations consisting of 176 F(2) plants for ms8 and 134 F(2) plants for msp were generated. BSA revealed that Sat_389 and Satt172 are closely associated markers with ms8 and msp, respectively. Map location of Sat_389 suggested that the ms8 gene is located on chromosome 7; molecular linkage group (MLG) M. Map location of Satt172 indicated that the msp gene is located on chromosome 2 (MLG Dlb). Genetic linkage maps developed using F(2) populations revealed that ms8 is flanked by a telomere and Sat_389 and msp is flanked by Sat_069 and GMES4176. The region between the telomere and Sat_389 is physically 160 Kb. Soybean sequence information revealed that there are 13 genes present in that region. Protein BLASTP analyses revealed that homologs of 3 of the 13 genes are known to a play role in cell division, suggesting putative candidates for ms8. PMID:20864624

Frasch, Ryan M; Weigand, Courtney; Perez, Paola T; Palmer, Reid G; Sandhu, Devinder

2010-09-23

242

Production of engineered long-life and male sterile Pelargonium plants  

PubMed Central

Background Pelargonium is one of the most popular garden plants in the world. Moreover, it has a considerable economic importance in the ornamental plant market. Conventional cross-breeding strategies have generated a range of cultivars with excellent traits. However, gene transfer via Agrobacterium tumefaciens could be a helpful tool to further improve Pelargonium by enabling the introduction of new genes/traits. We report a simple and reliable protocol for the genetic transformation of Pelargonium spp. and the production of engineered long-life and male sterile Pelargonium zonale plants, using the pSAG12::ipt and PsEND1::barnase chimaeric genes respectively. Results The pSAG12::ipt transgenic plants showed delayed leaf senescence, increased branching and reduced internodal length, as compared to control plants. Leaves and flowers of the pSAG12::ipt plants were reduced in size and displayed a more intense coloration. In the transgenic lines carrying the PsEND1::barnase construct no pollen grains were observed in the modified anther structures, which developed instead of normal anthers. The locules of sterile anthers collapsed 3–4?days prior to floral anthesis and, in most cases, the undeveloped anther tissues underwent necrosis. Conclusion The chimaeric construct pSAG12::ipt can be useful in Pelargonium spp. to delay the senescence process and to modify plant architecture. In addition, the use of engineered male sterile plants would be especially useful to produce environmentally friendly transgenic plants carrying new traits by preventing gene flow between the genetically modified ornamentals and related plant species. These characteristics could be of interest, from a commercial point of view, both for pelargonium producers and consumers.

2012-01-01

243

Sexual Function in Males After Radiotherapy for Rectal Cancer  

SciTech Connect

Purpose: Knowledge of sexual problems after pre- or postoperative radiotherapy (RT) with 50 Gy for rectal cancer is limited. In this study, we aimed to compare self-rated sexual functioning in irradiated (RT+) and nonirradiated (RT-) male patients at least 2 years after surgery for rectal cancer. Methods and Materials: Patients diagnosed with rectal cancer from 1993 to 2003 were identified from the Norwegian Rectal Cancer Registry. Male patients without recurrence at the time of the study. The International Index of Erectile Function, a self-rated instrument, was used to assess sexual functioning, and serum levels of serum testosterone were measured. Results: Questionnaires were returned from 241 patients a median of 4.5 years after surgery. The median age was 67 years at survey. RT+ patients (n = 108) had significantly poorer scores for erectile function, orgasmic function, intercourse satisfaction, and overall satisfaction with sex life compared with RT- patients (n = 133). In multiple age-adjusted analysis, the odds ratio for moderate-severe erectile dysfunction in RT+ patients was 7.3 compared with RT- patients (p <0.001). Furthermore, erectile dysfunction of this degree was associated with low serum testosterone (p = 0.01). Conclusion: RT for rectal cancer is associated with significant long-term effects on sexual function in males.

Bruheim, Kjersti, E-mail: Kjersti.bruheim@medisin.uio.n [Oslo University Hospital, Ulleval Cancer Centre, Oslo (Norway); Guren, Marianne G. [Oslo University Hospital, Ulleval Cancer Centre, Oslo (Norway); Dahl, Alv A. [Oslo University Hospital, Department of Clinical Cancer Research, the Norwegian Radium Hospital, Oslo (Norway); Faculty of Medicine, University of Oslo, Oslo (Norway); Skovlund, Eva [School of Pharmacy, University of Oslo, Oslo (Norway); Balteskard, Lise [University Hospital of Northern Norway, Tromso (Norway); Carlsen, Erik [Oslo University Hospital, Department of Gastrointestinal Surgery, Ulleval, Oslo (Norway); Fossa, Sophie D. [Oslo University Hospital, Department of Clinical Cancer Research, the Norwegian Radium Hospital, Oslo (Norway); Faculty of Medicine, University of Oslo, Oslo (Norway); Tveit, Kjell Magne [Oslo University Hospital, Ulleval Cancer Centre, Oslo (Norway); Faculty of Medicine, University of Oslo, Oslo (Norway)

2010-03-15

244

Exposure to harsh parenting and pornography as explanations for males' sexual coercion and females' sexual victimization.  

PubMed

Sexual violence against women is a major concern to researchers and policy makers, as well as to the general public. This study uses a sample of more than 2,000 college students to investigate the extent to which exposure to harsh parenting practices and sexually explicit materials contributes to perpetration and victimization. Findings indicate that frequent corporal punishment in the family of origin combined with consumption of pornographic materials increased the probability that males reported engaging in coercive sexual practices. For females, both frequent corporal punishment and exposure to paternal hostility combined with consumption of pornographic materials were associated with higher levels of reported sexual victimization. These results provide increased understanding of the impact of pornography use among a nonclinical sample, as well as the consequences of experiencing harsh corporal punishment in one's family of origin, on the sexual victimization of females. PMID:22852438

Simons, Leslie Gordon; Simons, Ronald L; Lei, Man-Kit; Sutton, Tara E

2012-01-01

245

Sexually Arousing Events and Relapse to Heroin-Seeking in Sexually Experienced Male Rats  

Microsoft Academic Search

Shaham, Y., J. Puddicombe and J. Stewart. Sexually arousing events and relapse to heroin-seeking in sexually experienced male rats. Physiol Behav 61(2) 337–341, 1997.—We have shown previously, using a reinstatement procedure, that both priming injections of heroin and exposure to footshock stress reinstate heroin-taking behavior following prolonged drug-free periods. In the present study, we examined the effects of another highly

Yavin Shaham; Jennifer Puddicombe; Jane Stewart

1997-01-01

246

Dominance, Coloration, and Social and Sexual Behavior in Male Drills Mandrillus leucophaeus  

Microsoft Academic Search

Sexual selection has driven the evolution and elaboration of a wide variety of displays and ornaments in male nonhuman primates,\\u000a including capes, cheek flanges, and sexual coloration. Among the most sexually dimorphic of all primates is the drill (Mandrillus leucophaeus), the males of which can be 3 times the mass of females, possess large canines, and exhibit extremely bright sexual

Jill S. Marty; James P. Higham; Elizabeth L. Gadsby; Caroline Ross

2009-01-01

247

Genetic studies on cytoplasmic male sterility in maize. Progress report, April 15, 1990--April 14, 1992  

SciTech Connect

Our research concerns the basic mechanisms of cytoplasmic male sterility (CMS) and fertility restoration in maize. The molecular determination of CMS is in the DNA of the mitochondria (mtDNA) but specific nuclear restorer-of-fertility (Rf) genes can overrule the male-sterile effect of the cytoplasm. Our approach to the study of the Rf genes is threefold. We are attempting to tag the cms-S Rf genes and the cms-T Rf2 gene with controlling elements (CEs). Since we have identified a number of spontaneous Rf genes for cms-S and have demonstrated that they are themselves transposable, we are also searching for cases in which an Rf gene is inserted into a wild-type gene. The other aspect of our research involves the nuclear control over the organization of the mitochondrial genome. We found that the changes in mtDNA organization upon cytoplasmic reversion to fertility were characteristic of the nuclear background in which the reversion event occurred. We have investigated whether these differences are a reflection of differences in the organization of the mtDNA genome before reversion.

Laughnan, J.R.

1992-05-01

248

Cytoplasmic male sterility in barley: Evidence for the involvement of cytokinins in fertility restoration  

PubMed Central

The hypothesis of the association between an increase in cytokinin activity and restoration of anther fertility in msm1 cytoplasm was tested. The following barley lines with Hordeum vulgare cv. Adorra nuclear gene background were studied: Adorra cytoplasm without nuclear restorer gene (fertile), Adorra cytoplasm homozygous for nuclear Rfm1a gene (fertile), msm1 cytoplasm without restorer gene (male sterile), msm1 cytoplasm homozygous for nuclear Rfm1a gene (fertile). Ethanolic extracts of root exudate were fractionated and bioassayed for cytokinins. Both the biological activity and the total quantity of cytokinins appeared lowest in the unrestored male sterile line. The total biological activities of cytokinins in the three fertile lines were similar, but the quantities in the restorer gene carriers appeared lower. On the other hand, the restorer gene carriers, independent of the cytoplasm, showed 8-9 times more of a bound cytokinin. Because the bound form is evidently underestimated by the bioassay, the increase in the bound cytokinin fraction may mean even a higher total content in the Rfm1a gene carriers than in Adorra without the gene. The bound cytokinin may be translocated more readily to distal organs (e.g., the anthers) compared with unbound cytokinins. Because cytokinins are associated with various ecophysiological processes, the rise in a particular form may explain the heterogeneous distribution of the restorer gene in wild barley populations in different regions of Israel.

Ahokas, Hannu

1982-01-01

249

Comparisons Among Two Fertile and Three Male-Sterile Mitochondrial Genomes of Maize  

PubMed Central

We have sequenced five distinct mitochondrial genomes in maize: two fertile cytotypes (NA and the previously reported NB) and three cytoplasmic-male-sterile cytotypes (CMS-C, CMS-S, and CMS-T). Their genome sizes range from 535,825 bp in CMS-T to 739,719 bp in CMS-C. Large duplications (0.5–120 kb) account for most of the size increases. Plastid DNA accounts for 2.3–4.6% of each mitochondrial genome. The genomes share a minimum set of 51 genes for 33 conserved proteins, three ribosomal RNAs, and 15 transfer RNAs. Numbers of duplicate genes and plastid-derived tRNAs vary among cytotypes. A high level of sequence conservation exists both within and outside of genes (1.65–7.04 substitutions/10 kb in pairwise comparisons). However, sequence losses and gains are common: integrated plastid and plasmid sequences, as well as noncoding “native” mitochondrial sequences, can be lost with no phenotypic consequence. The organization of the different maize mitochondrial genomes varies dramatically; even between the two fertile cytotypes, there are 16 rearrangements. Comparing the finished shotgun sequences of multiple mitochondrial genomes from the same species suggests which genes and open reading frames are potentially functional, including which chimeric ORFs are candidate genes for cytoplasmic male sterility. This method identified the known CMS-associated ORFs in CMS-S and CMS-T, but not in CMS-C.

Allen, James O.; Fauron, Christiane M.; Minx, Patrick; Roark, Leah; Oddiraju, Swetha; Lin, Guan Ning; Meyer, Louis; Sun, Hui; Kim, Kyung; Wang, Chunyan; Du, Feiyu; Xu, Dong; Gibson, Michael; Cifrese, Jill; Clifton, Sandra W.; Newton, Kathleen J.

2007-01-01

250

Restoration of fertility in cytoplasmic male sterile (CMS) Nicotiana Sylvestris by fusion with X-irradiated N. tabacum protoplasts  

Microsoft Academic Search

Restoration of male fertility was achieved by fusing protoplasts from male sterile (CMS) Nicotiana sylvestris plants with X-irradiated protoplasts derived from fertile N. tabacum plants. The CMS N. sylvestris plants were derived from a previous somatic hybridization experiment and contained alien (Line 92) cytoplasm. About one quarter of the regenerated plants were found to be cybrids. i.e. they consisted of

D. Aviv; E. Galun

1980-01-01

251

Genetics of hybrid male sterility between Drosophila sibling species: a complex web of epistasis is revealed in interspecific studies  

Microsoft Academic Search

To study the genetic differences responsible for the sterility of their male hybrids, we introgressed small segments of an X chromosome from Drosophila simulans into a pure Drosophila mauritiana genetic background, then assessed the fertility of males carrying heterospecific introgressions of varying size. Although this analysis examined less than 20% of the X chromosome (roughly 5% of the euchromatic portion

Michael F. Palopoli; Chung-I Wu

1995-01-01

252

The Arabidopsis male-sterile mutant, opr3, lacks the 12-oxophytodienoic acid reductase required for jasmonate synthesis  

Microsoft Academic Search

Jasmonic acid (JA) and its precursor 12-oxophytodienoic acid (OPDA) act as plant growth regulators and mediate responses to environmental cues. To investigate the role of these oxylipins in anther and pollen development, we characterized a T-DNA-tagged, male-sterile mutant of Arabidopsis, opr3. The opr3 mutant plants are sterile but can be rendered fertile by exogenous JA but not by OPDA. Cloning

Annick Stintzi; John Browse

2000-01-01

253

Cytoplasmic male sterility with self-incompatibility, a novel approach to utilizing heterosis in rapeseed ( Brassica napus L.)  

Microsoft Academic Search

The Polima cytoplasmic male sterility (CMS) system has been successfully used in three\\/two-line hybrid production in rapeseed\\u000a (Brassica napus L.). However, the sterility of the Polima (pol) CMS lines is sensitive to temperature fluctuations. Also, traces of pollen\\u000a can cause self-pollination within the CMS lines, which results in reduced levels of F1 hybrid seed purity and leads to a significant

Jin-xiong Shen; Han-zhong Wang; Ting-dong Fu; Bao-ming Tian

2008-01-01

254

Understanding Male Sexual OffendingA Comparison of General and Specialist Theories  

Microsoft Academic Search

Previous research has explored whether criminological theories can account for the apparently specialized behaviors of sexual offenders. One perspective proposes that criminals are versatile, engaging in an array of antisocial behaviors. The alternative perspective, more common in sexual offending research, is that sexual offenders (especially child molesters) engage in sexual offenses exclusively or predominantly. This study examined 374 male sexual

Danielle A. Harris; Paul Mazerolle; Raymond A. Knight

2009-01-01

255

Male-sterility induction in transgenic tobacco plants with an unedited atp9 mitochondrial gene from wheat.  

PubMed Central

Cytoplasmic male sterility in plants is associated with mitochondrial dysfunction. We have proposed that a nuclear-encoded chimeric peptide formed by mitochondrial sequences when imported into the mitochondria may impair organelle function and induce male sterility in plants. A model developed to test this hypothesis is reported here. Assuming that the editing process in higher plant mitochondria reflects a requirement for producing active proteins, we have used edited and unedited coding sequences of wheat ATP synthase subunit 9 (atp9) fused to the coding sequence of a yeast coxIV transit peptide. Transgenic plants containing unedited atp9 exhibited either fertile, semifertile, or male-sterile phenotypes; controls containing edited atp9 or only the selectable marker gave fertile plants. Pollen fertility ranged from 31% to 75% in fertile plants, 10% to 20% in semifertile plants, and < 2% in male-sterile plants. Genetic and molecular data showed that the chimeric plasmid containing the transgene is inherited as a Mendelian trait. The transgenic protein is imported into the mitochondria. The production and frequency of semifertile or male-sterile transgenic plants conform to the proposed hypothesis. Images Fig. 2 Fig. 3 Fig. 4

Hernould, M; Suharsono, S; Litvak, S; Araya, A; Mouras, A

1993-01-01

256

Effects of sex chromosome aneuploidy on male sexual behavior  

PubMed Central

Incidence of sex chromosome aneuploidy in men is as high as 1:500. The predominant conditions are an additional Y chromosome (47,XYY) or an additional X chromosome (47,XXY). Behavioral studies using animal models of these conditions are rare. To assess the role of sex chromosome aneuploidy on sexual behavior, we used mice with a spontaneous mutation on the Y chromosome in which the testis-determining gene Sry is deleted (referred to as Y?) and insertion of a Sry transgene on an autosome. Dams were aneuploid (XXY?) and the sires had an inserted Sry transgene (XYSry). Litters contained six male genotypes, XY, XYY?, XXSry, XXY?Sry, XYSry and XYY?Sry. In order to eliminate possible differences in levels of testosterone, all of the subjects were castrated and received testosterone implants prior to tests for male sex behavior. Mice with an additional copy of the Y? chromosome (XYY?) had shorter latencies to intromit and achieve ejaculations than XY males. In a comparison of the four genotypes bearing the Sry transgene, males with two copies of the X chromosome (XXSry and XXY?Sry) had longer latencies to mount and thrust than males with only one copy of the X chromosome (XYSry and XYY?Sry) and decreased frequencies of mounts and intromissions as compared with XYSry males. The results implicate novel roles for sex chromosome genes in sexual behaviors.

Park, J. H.; Burns-Cusato, M.; Dominguez-Salazar, E.; Riggan, A.; Shetty, S.; Arnold, A. P.; Rissman, E. F.

2008-01-01

257

[Gonad function and sexual activity in male renal transplant patients].  

PubMed

Gonad function and sexual activity were evaluated in 44 young male adults who received a kidney shortly before or during adolescence. All patients were growth-retarded (-2.2 SD). Volume of the testes was decreased less than 12 ml, i.e, less than 10th centile) in 47% of patients, whereas hormone levels (testosterone, FSH, LH, and prolactin) were within the normal range. Oligospermia or azoospermia was found in 10 of 11 tested patients. Testicular function and sperm count were negatively correlated with renal function. Age at first ejaculation was increased and 57% of patients had never had sexual intercourse, although all patients reported normal sexual drive and normal erections. PMID:1929106

Kassmann, K; Arsan, A; Sharer, K; Broyer, M

1991-06-01

258

The sexual abuse of children: A comparison of male and female victims  

Microsoft Academic Search

Although estimates of the incidence of reported child sexual maltreatment vary greatly, most authors agree there is a predominance of female to male victims. Yet studies of sexual offenders suggest afar greater proportion of male victims than is reported. This study compared circumstances surrounding the abuse for boy and girl victims. A total of 81 reported cases of male sexual

Edward D. Farber; Jacy Showers; Charles F. Johnson; Jack A. Joseph; Linda Oshins

1984-01-01

259

Sexually Degrading Music Videos and Lyrics: Their Effects on Males’ Aggression and Endorsement of Rape Myths and Sexual Stereotypes  

Microsoft Academic Search

Utilizing a 2 (lyrics: present or absent) × 2 (images: present or absent) design, this study examined the unique effects of sexually degrading music videos and music lyrics on males’ aggressive behavior toward women, as well as males’ endorsement of rape myths and sexual stereotypes. Under the guise of a media memory study, 187 male undergraduate students were randomly assigned

Eric L. Sprankle; Christian M. End; Miranda N. Bretz

2012-01-01

260

Sexual selection against deleterious mutations via variable male search success  

PubMed Central

In many species, successful mating requires the initial step of actively searching for and locating a female. The overall health or condition of a male is likely to affect their ability to do this, making search effort a potentially important component of sexual fitness that may have important consequences for population mean fitness. We investigated the potential population genetic consequences of search effort using 10 populations of Drosophila melanogaster, each fixed for a different recessive mutation with a visible phenotypic effect. Mate choice trials were conducted in arenas of varying size, requiring different levels of search ability. Sexual selection against mutant males was stronger when increased search effort was included than when it was excluded. Varying abilities to find mates can substantially increase the strength of selection against deleterious alleles.

MacLellan, Kelsie; Whitlock, Michael C.; Rundle, Howard D.

2009-01-01

261

Evaluation of a Treatment Program for Sexually Abused Adult Males  

Microsoft Academic Search

This study evaluated the effectiveness of an individual treatment program for five adult males who experienced childhood sexual abuse. A treatment manual focusing on abuse-related self-blame, anger, and anxiety was developed. Daily self-blame, anger, and anxiety self-ratings were completed before and throughout treatment. A multiple-baseline approach was used to evaluate treatment effects. Overall findings indicated that most participants experienced significant

Elisa Romano; Rayleen V. De Luca

2006-01-01

262

The Marsupial Male: A Role Model for Sexual Development  

Microsoft Academic Search

Sexual differentiation in male marsupials has many similarities with that of eutherians. Marsupials have an XX-XY sex determining mechanism, and have a homologue of the testis-determining SRY gene on their Y-chromosome. However, the development pattern of SRY gene expression is different from the mouse in that it is expressed for a much longer period. SRY is expressed in a range

Marilyn B. Renfree; Jenny L. Harry; Geoffrey Shaw

1995-01-01

263

Effect of potassium channel modulators on male sexual behavior  

Microsoft Academic Search

In the adult sexually experienced male rat, the intracerebroventricular (i.c.v.) injection of pinacidil, a KATP channel opener, at the dose of 100–150–300 ?\\/rat worsened the copulatory performance in the presence of a receptive female, whereas the administration of glibenclamide, a KATP channel blocker, at the dose of 0.5 and 3 mgkg intraperitoneally (i.p.) had an improving effect. These data indicate

A. Benelli; R. Arletti; R. Poggioli; E. Cavazzuti; M. Mameli; A. Bertolini

1996-01-01

264

Haldane's rule: hybrid sterility affects the heterogametic sex first because sexual differentiation is on the path to species differentiation.  

PubMed

Prevention of recombination is needed to preserve both phenotypic differentiation between species and sexual phenotypic differentiation within species. For species differentiation (speciation), isolating barriers preventing recombination may be pre-zygotic (gamete transfer barriers), or post-zygotic (either a developmental barrier resulting in hybrid inviability, or a chromosomal-pairing barrier resulting in hybrid sterility). The sterility barrier is usually the first to appear and, although often initially only manifest in the heterogametic sex (Haldane's rule), is finally manifest in both sexes. For sexual differentiation, the first and only barrier is chromosomal-pairing, and always applies to the heterogametic sex. For regions of sex chromosomes affecting sexual differentiation there must be something analogous to the process generating the hybrid sterility seen when allied species cross. Explanations for Haldane's rule have generally assumed that the chromosomal-pairing barrier initiating evolutionary divergence into species is due to incompatibilities between gene products ("genic), or sets of gene products ("polygenic), rather than between chromosomes per se ("chromosomal"). However, if chromosomal incompatibilities promoting incipient sexual differentiation could also contribute to the process of incipient speciation, then a step towards speciation would have been taken in the heterogametic sex. Thus, incipient speciation, manifest as hybrid sterility when "varieties" are crossed, would appear at the earliest stage in the heterogametic sex, even in genera with homomorphic sex chromosomes (Haldane's rule for hybrid sterility). In contrast, it has been proposed that Haldane's rule for hybrid inviability needs differences in dosage compensation, so could not apply to genera with homomorphic sex chromosomes. PMID:10816367

Forsdyke, D R

2000-06-01

265

Forensic medical aspects of male-on-male rape and sexual assault in greater Manchester.  

PubMed

Male-on-male rapes and sexual assaults comprise fewer than 10% of such assaults reported to the police, and so many physicians seldom encounter them. This paper provides an overview of the nature of sexual assault encountered by males, ensuing injuries, and comparisons with male-on-female assault cases. The retrospective epidemiological study was on two cohorts seen at St. Mary's Sexual Assault Referral Centre, Manchester. The participants were Centre clients seen between October 1986 and mid-May 2003; 376 male eases (370 individual clients) and 7,789 female cases (7,403 individual clients). The main outcome measure was the presence of injury (abrasion, laceration, or bruise) to defined body areas. The results showed that 66% of male cases (when assault type was known) had been raped, significantly fewer than in female cases, (p 0.00, a 0.05, O.R. 0.474, 95% C.I. 0.357 to 0.63). Eighteen per cent of male cases that had a forensic medical examination presented with an anal injury, significantly more than in females (p 0.00, a 0.05, O.R. 6.101, 95% C.I. 4.216 to 8.829). Significantly fewer males than females sustained injuries to other body areas. The conclusion was that males were significantly more likely (six times) than females to receive at least one injury to the anal area. Even so, males are five times more likely to have no anal injury. PMID:15176630

McLean, Iain A; Balding, Val; White, Cath

2004-04-01

266

A mitochondrial DNA sequence is associated with abnormal pollen development in cytoplasmic male sterile bean plants.  

PubMed Central

Cytoplasmic male sterility (CMS) in common bean is associated with the presence of a 3-kb unique mitochondrial sequence designated pvs. The pvs sequence encodes at least two open reading frames (297 and 720 bp in length) with portions derived from the chloroplast genome. Fertility restoration by the nuclear restorer gene Fr results in the loss of this transcriptionally active unique region. We examined the effect of CMS (pvs present) and fertility restoration by Fr (pvs absent) on the pattern of pollen development in bean. In the CMS line, pollen aborted in the tetrad stage late in microgametogenesis. Microspores maintained cytoplasmic connections throughout pollen development, indicating aberrant or incomplete cytokinesis. Pollen-specific events associated with pollen abortion and fertility restoration imply that a gametophytic factor or event may be involved in CMS. In situ hybridization experiments suggested that significant reduction or complete loss of the mitochondrial sterility-associated sequence occurred in fertile pollen of F2 populations segregating for fertility. These observations support a model of fertility restoration by the loss of a mitochondrial DNA sequence prior to or during microsporogenesis/gametogenesis.

Johns, C; Lu, M; Lyznik, A; Mackenzie, S

1992-01-01

267

Maintaining and restoring cytoplasmic male sterility systems in pepper (Capsicum annuum L.).  

PubMed

We studied the efficiency of maintaining and restoring cytoplasmic male sterility (CMS) systems in pepper (Capsicum annuum L.). An Rf-linked molecular marker was employed to analyze the interaction between 6 CMS lines (A), 5 maintainers (B), and 6 restorers (C). Sterility was maintained in the matings of lines 201A x 200B, 203A x 200B, 206A x 200B, 200A x 201B, 206A x 201B, 200A x 202B, 200A x 203B, 200A x 206B, and 201A x 206B. All 6 restorers restored the fertility of lines 200A, 202A, 203A, and 204A, except that 213C could not restore the fertility of lines 200A and 204A. However, the 6 restorers had diverse restoring abilities in individual CMS lines. The Rf-linked molecular marker was amplified by PCR in lines 207C, 208C, and 213C. This DNA marker was only found in the F1 hybrids M39, M14, M19, M25, M13, M20, and M22. We conclude that the restorers 208C and 207C can transmit the Rf gene or the Rf-linked marker to F1 hybrids. PMID:23315867

Ma, Y; Huang, W; Ji, J-J; Gong, Z-H; Yin, C-C; Ahmed, S S; Zhao, Z-L

2013-07-08

268

Women's experiences of male-perpetrated sexual assault by sexual orientation.  

PubMed

This study examined differences in male-perpetrated adult sexual assault experiences among women of various sexual orientations using a large urban convenience sample (N = 1,022). Results showed many similarities in disclosure to others, perceived helpfulness, and attributions of blame, but there were also differences by sexual orientation. Heterosexual women were more likely to experience completed sexual assault than lesbian or bisexual women. Lesbians were more likely to be assaulted by relatives than bisexual or heterosexual women. Finally, bisexual women disclosed the assault to the greatest number of formal support sources, were most likely to tell a romantic partner about the assault, received the fewest positive social reactions overall, and had higher posttraumatic stress disorder (PTSD) symptomatology. PMID:18225383

Long, Susan M; Ullman, Sarah E; Long, LaDonna M; Mason, Gillian E; Starzynski, Laura L

2007-01-01

269

Effects of zinc supplementation on sexual behavior of male rats  

PubMed Central

CONTEXT: Effects of zinc on male sexual competence are poorly understood. AIM: To study the effects of different doses of zinc on the sexual competence of males using a rat model. MATERIALS AND METHODS: Three subsets (eight in each subset) of sexually experienced adult male rats were supplemented with three different oral doses of zinc sulphate (a daily dose of 1 mg, 5 mg and 10 mg respectively) for two weeks. A subset of eight animals without zinc supplementation was used as the control group Sexual behavior was observed by placing them individually in cages with receptive females. STATISTICAL ANALYSIS: Data analysis was done using SPSS v10 for windows computer software. RESULTS: Supplementation of 5 mg of zinc/day for two weeks led to a prolongation of ejaculatory latency; 711.6 sec. (SEM 85.47) vs. 489.50 sec. (SEM 67.66), P < 0.05 and an increase in number of penile thrusting; 52.80 (SEM 11.28) vs. 26.50 (SEM 6.17), P < 0.05, compared to controls. The same group had elevated prolactin (PRL) and testosterone (T) levels compared to controls at the end of treatment period; PRL- 7.22 ng/dl (SEM 3.68) vs. 2.90 ng/dl (SEM 0.34) and T- 8.21 ng/ml (SEM 6.09) vs. 2.39 ng/ml (SEM 1.79), P < 0.05. In contrast, reduction of libido was evident in the same group, but this effect was not statistically significant (P > 0.05). However, partner preference index was positive and 5 mg zinc supplementation did not exert a significant adverse effect on the muscle strength and co-ordination. The subset of rats supplemented with 1 mg/day did not show a difference from the control group while supplementation with 10 mg/day led to a reduction of the libido index, number of mounts and intromissions. CONCLUSIONS: Zinc therapy improves sexual competence of male rats; the effect is dose dependent. Increase in the T levels is beneficial in this regard. However, increase in PRL is responsible for the reduced libido index. Further studies on pigs and monkeys are needed to evaluate the therapeutic use of zinc in sexual dysfunction.

Dissanayake, DMAB; Wijesinghe, PS; Ratnasooriya, WD; Wimalasena, S

2009-01-01

270

Effects of zinc supplementation on sexual behavior of male rats.  

PubMed

Context: Effects of zinc on male sexual competence are poorly understood. Aim: To study the effects of different doses of zinc on the sexual competence of males using a rat model. Materials and Methods: Three subsets (eight in each subset) of sexually experienced adult male rats were supplemented with three different oral doses of zinc sulphate (a daily dose of 1 mg, 5 mg and 10 mg respectively) for two weeks. A subset of eight animals without zinc supplementation was used as the control group Sexual behavior was observed by placing them individually in cages with receptive females. Statistical Analysis : Data analysis was done using SPSS v10 for windows computer software. Results: Supplementation of 5 mg of zinc/day for two weeks led to a prolongation of ejaculatory latency; 711.6 sec. (SEM 85.47) vs. 489.50 sec. (SEM 67.66), P < 0.05 and an increase in number of penile thrusting; 52.80 (SEM 11.28) vs. 26.50 (SEM 6.17), P < 0.05, compared to controls. The same group had elevated prolactin (PRL) and testosterone (T) levels compared to controls at the end of treatment period; PRL- 7.22 ng/dl (SEM 3.68) vs. 2.90 ng/dl (SEM 0.34) and T- 8.21 ng/ml (SEM 6.09) vs. 2.39 ng/ml (SEM 1.79), P < 0.05. In contrast, reduction of libido was evident in the same group, but this effect was not statistically significant ( P > 0.05). However, partner preference index was positive and 5 mg zinc supplementation did not exert a significant adverse effect on the muscle strength and co-ordination. The subset of rats supplemented with 1 mg/day did not show a difference from the control group while supplementation with 10 mg/day led to a reduction of the libido index, number of mounts and intromissions. Conclusions : Zinc therapy improves sexual competence of male rats; the effect is dose dependent. Increase in the T levels is beneficial in this regard. However, increase in PRL is responsible for the reduced libido index. Further studies on pigs and monkeys are needed to evaluate the therapeutic use of zinc in sexual dysfunction. PMID:19881149

Dissanayake, Dmab; Wijesinghe, P S; Ratnasooriya, W D; Wimalasena, S

2009-07-01

271

A Mup promoter-thymidine kinase reporter gene shows relaxed tissue-specific expression and confers male sterility upon transgenic mice.  

PubMed Central

A hybrid gene was made by fusing the 2.2-kilobase 5' promoter region of a mouse group 1 major urinary protein (Mup) gene to the coding region of the herpes simplex virus type 1 thymidine kinase gene (HSV tk) and introduced into the genomes of mice by microinjection. Transgenic G0 males were sterile, or when fertile did not transmit the foreign gene, and the transgenic male descendants of G0 females were also sterile. Seven "lines" were established by breeding from G0 females and their transgenic female descendants. Six lines expressed HSV thymidine kinase activity in the liver, and activity correlated perfectly with the presence of HSV tk RNA. In three of four lines examined, expression was lower in female than in male liver, and in these lines the same sex difference was observed in the rate of run-on transcription of the foreign genes in liver nuclei. When females of one of the sexually dimorphic lines were treated with testosterone, the levels of HSV tk RNA and thymidine kinase activity were increased, although not to male levels. In these aspects of liver expression, and also in a lack of expression in seven other tissues, the hybrid gene exhibits many of the characteristics of an endogenous group 1 Mup gene. However, the gene was also expressed (at high levels) in the preputial gland and testis, two tissues in which Mup genes are not expressed. The gene, when introduced into five of the seven lines, carried a copy of the Escherichia coli supF gene attached beyond the 3' end of the HSV tk gene, but this did not affect the overall expression pattern. All of the lines were male sterile and expressed HSV thymidine kinase in the testis, but one line showed no activity in the liver, and another showed none in the preputial gland. Testicular expression is therefore the likely cause of sterility. Data are described which suggest that the causes of misexpression in the preputial gland and testis are different. Since expression in each tissue occurred in several lines, the structure of the hybrid gene must be responsible in each case. Five intensively studied lines showed at least four consistently different patterns of relative expression in preputial gland, testis, male liver, and female liver. These differences do not correlate in any way with the copy number of the foreign gene in the different lines and must be due to some other aspect of line specific integration. Images

Al-Shawi, R; Burke, J; Jones, C T; Simons, J P; Bishop, J O

1988-01-01

272

Open Field Release of Genetically Engineered Sterile Male Aedes aegypti in Malaysia  

PubMed Central

Background Dengue is the most important mosquito-borne viral disease. In the absence of specific drugs or vaccines, control focuses on suppressing the principal mosquito vector, Aedes aegypti, yet current methods have not proven adequate to control the disease. New methods are therefore urgently needed, for example genetics-based sterile-male-release methods. However, this requires that lab-reared, modified mosquitoes be able to survive and disperse adequately in the field. Methodology/Principal Findings Adult male mosquitoes were released into an uninhabited forested area of Pahang, Malaysia. Their survival and dispersal was assessed by use of a network of traps. Two strains were used, an engineered ‘genetically sterile’ (OX513A) and a wild-type laboratory strain, to give both absolute and relative data about the performance of the modified mosquitoes. The two strains had similar maximum dispersal distances (220 m), but mean distance travelled of the OX513A strain was lower (52 vs. 100 m). Life expectancy was similar (2.0 vs. 2.2 days). Recapture rates were high for both strains, possibly because of the uninhabited nature of the site. Conclusions/Significance After extensive contained studies and regulatory scrutiny, a field release of engineered mosquitoes was safely and successfully conducted in Malaysia. The engineered strain showed similar field longevity to an unmodified counterpart, though in this setting dispersal was reduced relative to the unmodified strain. These data are encouraging for the future testing and implementation of genetic control strategies and will help guide future field use of this and other engineered strains.

Raduan, Norzahira; Kwee Wee, Lim; Hong Ming, Wong; Guat Ney, Teoh; Rahidah A.A., Siti; Salman, Sawaluddin; Subramaniam, Selvi; Nordin, Oreenaiza; Hanum A.T., Norhaida; Angamuthu, Chandru; Marlina Mansor, Suria; Lees, Rosemary S.; Naish, Neil; Scaife, Sarah; Gray, Pam; Labbe, Genevieve; Beech, Camilla; Nimmo, Derric; Alphey, Luke; Vasan, Seshadri S.; Han Lim, Lee; Wasi A., Nazni; Murad, Shahnaz

2012-01-01

273

Sexual development and fertility of Loxl1-/- male mice.  

PubMed

Our objective was to investigate the genitourinary defects and fertility of the male lysyl oxidase-like 1 gene (Loxl1) knockout (Loxl1(-/-)) mouse, with particular attention to fecundity and testicular, epididymal, gubernacular, and penile histopathology, which may lead us to a better understanding of the role of the elastin-homeostasis gene, LOXL1, in male sexual development. Genital morphometric evaluation of 6- to 9-month-old male Loxl1(-/-) mice (n = 26) was compared with C57Bl/6 controls (n = 24). Measurements included: body weight, scrotal development, evidence of feminization (nipples or vaginal pouch), penile malformations, anogenital distance, and absence/presence and size of perineal bulge. Sperm production was estimated using a standardized technique. A breeding program was conducted to determine how much of the infertility observed in Loxl1(-/-) pairs was due to the male factor. Finally, we performed histopathologic comparison of the genitourinary organs of Loxl1(-/-) and control mice. Loxl1(-/-) mice weighed less than their age-matched C57Bl/6 counterparts (P < .001). Size-adjusted perineal bulge was larger (P < .001), and resting location of the gonads was higher intra-abdominally (P = .048) in the Loxl1(-/-) mice. Estimates of daily sperm counts revealed that the Loxl1(-/-) mice had lower sperm production (P = .048). Loxl1(-/-) males bred with control females demonstrated relative fecundity values intermediate between Loxl1(-/-) pairs (lowest fecundity) and control pairs (highest fecundity), suggesting a component of male-factor infertility. No histologic differences were noted using hematoxylin-eosin or specialized elastin staining of the gonads, gubernaculum, and penis. Although further studies are warranted, these findings suggest a subtle and likely multifactorial role of the LOXL1 protein in male sexual development and fertility. PMID:19201700

Wood, Hadley M; Lee, Una J; Vurbic, Drina; Sabanegh, Edmund; Ross, Jonathan H; Li, Tiansen; Damaser, Margot S

2009-02-05

274

[Cytological observation of anther abortion and starch distribution of a cytoplasm male sterile pepper (Capsicum annum L.)].  

PubMed

A cytoplasm male sterile pepper (Capsicum annum L.) was examined using cytochemical method to study its pollen abortion. Thick sections of both anthers of male sterility line 8214A and its maintainer 8214B at different stages were stained using Periodic Acid-Schiff's (PAS) reaction to detect starch distribution. Anther structure and starch distribution in both anthers of male sterility and maintainer line were similar before the meiosis of microspore mother cells. After meiosis, the size of tapetal cells of fertile anthers of maintainer line increased and became high vacuolation. Abundant small starches appeared in the connective cells from tetrad stage to early stage of microspore development. At the late stage of microspore, the tapetal cells began to degenerate and the starches in the connective cells became large. Bi-cellular pollen synthesized starches after the large vacuole of vegetative cell disappeared, and abundant starches were stored in the mature pollen. In the anthers of male sterile line, meiosis of microspore mother could occurred and the tetrads could be formed in the locule, but the tetrads were extruded together because the locule could not enlarge its space. Finally, the tetrad microspores degenerated. The development of vascular tissue of the sterile anthers was normal and abundant starches were stored in the connective cells, which suggested that the function of plant transporting polysaccharide into anther was normal but tapetum could not transport the polysaccharide into locule. According to our result, the pollen abortion occurred in the tetrad stage and the abnormal development of tapetal cells might be the reason which induced tetrad microspore abortion in this male sterile pepper. PMID:18959002

Qiu, Yi Lan; Liu, Zhu Li; Li, Hong; Chen, Song; Chen, Liang Bi; Tian, Hui Qiao

2008-08-01

275

Differential behavioral response to dopamine D2 agonists by sexually naive, sexually active, and sexually inactive male rats.  

PubMed

This study was performed with male rats categorized as sexually naive (SN), sexually active (SA), or sexually inactive (SI). In a first experiment the effects of dopamine (DA) D2 agonist SND 919 (0.05, 1, and 10 mg/kg) on the copulatory behavior of SN, SA and SI rats were assessed. In a second experiment the DA D2 agonist B-HT 920 (0.2 mg/kg) was used, and examination was limited to SN and SA rats. The effects exerted on stretching-yawning, penile erection, and sedation by the same compounds at the same doses in these three rat categories were also investigated. The main findings were that SND 919 and B-HT 920 facilitated ejaculation in SA rats, and that the rats that were different as regards level of sexual activity exhibited different behavioral responses to the two DA agonists. PMID:8864270

Giuliani, D; Ferrari, F

1996-08-01

276

Sexually mature and immature yearling male European ground squirrels: A comparison of behavioral and physiological parameters  

Microsoft Academic Search

Early puberty may increase lifetime reproductive success, but may also entail diverse costs. In male European ground squirrels (Spermophilus citellus), age at sexual maturity varies among individuals. We compared sexually active and inactive yearling males under standardized conditions in outdoor enclosures. Non-reproductive yearling males hibernated significantly longer than mature males and emerged when the mating period had already started. Testosterone

Anna Strauss; Elvira Mascher; Rupert Palme; Eva Millesi

2007-01-01

277

Sexuality and aging in male veterans: A cross-sectional study of interest, ability, and activity  

Microsoft Academic Search

To gather data on sexuality, specifically in male veterans, and to test the hypothesis that aged males remain interested in sexual intercourse yet suffer from erectile failure, veterans age 30 to 99 were surveyed. The mailed survey had 88 questions and was pretested on young potent males and aged impotent males. From 1031 randomly selected subjects, there were 806 replies:

Thomas Mulligan; C. Renee Moss

1991-01-01

278

High-quality male field crickets invest heavily in sexual display but die young  

Microsoft Academic Search

Only high-quality males can bear the costs of an extreme sexual display. As a consequence, such males are not only more attractive, but they often live longer than average. Recent theory predicts, however, that high-quality males should sometimes invest so heavily in sexual displays that they die sooner than lower quality males. We manipulated the phenotypic quality of field crickets,

John Hunt; Robert Brooks; Michael D. Jennions; Michael J. Smith; Caroline L. Bentsen; Luc F. Bussière

2004-01-01

279

Determinants of male fitness: disentangling intra- and inter-sexual selection  

Microsoft Academic Search

Both intra- and inter-sexual selection may crucially determine a male's fitness. Their interplay, which has rarely been experimentally investigated, deter- mines a male's optimal reproductive strategy and thus is of fundamental importance to the understanding of a male's behaviour. Here we investigated the relative importance of intra- and inter-sexual selection for male fitness in the common lizard. We investigated which

P. S. FITZE; J. COTE; J. P. MARTÍNEZ-RICA; J. CLOBERT

2007-01-01

280

QTL involved in the partial restoration of male fertility of C-type cytoplasmic male sterility in maize.  

PubMed

Partial restoration of male fertility limits the use of C-type cytoplasmic male sterility (C-CMS) for the production of hybrid seeds in maize. Nevertheless, the genetic basis of the trait is still unknown. Therefore, the aim to this study was to identify genomic regions that govern partial restoration by means of a QTL analysis carried out in an F(2) population (n = 180). This population was derived from the Corn Belt inbred lines B37C and K55. F(2)BC(1) progenies were phenotyped at three locations in Switzerland. Male fertility was rated according to the quality and number of anthers as well as the anthesis-silking interval. A weak effect of environment on the expression of partial restoration was reflected by high heritabilities of all fertility-related traits. Partial restoration was inherited like an oligogenic trait. Three major QTL regions were found consistently across environments in the chromosomal bins 2.09, 3.06 and 7.03. Therefore, a marker-assisted counter-selection of partial restoration is promising. Minor QTL regions were found on chromosomes 3, 4, 5, 6 and 8. A combination of partial restorer alleles at different QTL can lead to full restoration of fertility. The maternal parent was clearly involved in the partial restoration, because the restorer alleles at QTL in bins 2.09, 6.04 and 7.03 originated from B37. The three major QTL regions collocated with other restorer genes of maize, a phenomenon, which seems to be typical for restorer genes. Therefore, a study of the clusters of restorer genes in maize could lead to a better understanding of their evolution and function. In this respect, the long arm of chromosome 2 is particularly interesting, because it harbors restorer genes for the three major CMS systems (C, T and S) of maize. PMID:21479555

Kohls, Susanne; Stamp, Peter; Knaak, Carsten; Messmer, Rainer

2011-04-09

281

A Secular Trend toward Earlier Male Sexual Maturity: Evidence from Shifting Ages of Male Young Adult Mortality  

PubMed Central

This paper shows new evidence of a steady long-term decline in age of male sexual maturity since at least the mid-eighteenth century. A method for measuring the timing of male maturity is developed based on the age at which male young adult mortality accelerates. The method is applied to mortality data from Sweden, Denmark, Norway, the United Kingdom, and Italy. The secular trend toward earlier male sexual maturity parallels the trend toward earlier menarche for females, suggesting that common environmental cues influence the speed of both males' and females' sexual maturation.

Goldstein, Joshua R.

2011-01-01

282

Suicide attempts among sexual-minority male youth.  

PubMed

The purpose of this study was to provide data addressing Diamond's (this issue) 4 problem areas in sexual orientation research by comparing gay, bisexual, and questioning male youth who report attempting suicide with those who do not. Secondary analyses were conducted with 2 datasets, 1 with a gay support group (n = 51) and the other with online youth (n = 681). Reported suicide attempts ranged from 39% among support-group youth, to 25% among Internet gay support group youth, to 9% among Internet non-support group youth. Sexual orientation, behavior, and identity did not predict suicidal attempt status, but suicide attempters experienced higher levels of both generic life stressors (low self-esteem, substance use, victimization) and gay-related stressors, particularly those directly related to visible (femininity) and behavioral (gay sex) aspects of their sexual identity. Support-group attendance was related to higher levels of suicidality and life stressors, as well as certain resiliency factors. Results suggest that there exists a minority of sexual-minority youth who are at risk but that it would be inappropriate to characterize the entire population as such. PMID:14710459

Savin-Williams, Ritch C; Ream, Geoffrey L

2003-12-01

283

KNOWLEDGE OF SEXUALLY TRANSMITTED DISEASES AND SEXUAL BEHAVIOURS AMONG MALAYSIAN MALE YOUTHS.  

PubMed

Summary This study examines the knowledge of sexually transmitted diseases (STDs) among male youths in Malaysia. A self-administered survey was carried out on a sample of 952 never-married males aged 15-24 years. The respondents were asked about their knowledge of STDs, how these diseases get transmitted and their sexual behaviours. The data showed that 92% of the respondents knew of at least one STD (syphilis, gonorrhoea, chlamydia, herpes, genital warts, yeast infection, trichomoniasis or HIV/AIDS). About 95% of them knew of at least one method of STD transmission. Urban and tertiary-educated male youths showed a substantially higher proportion of awareness of STDs and transmission methods compared with their rural and less-educated counterparts. The data also indicated that 10% of the study sample admitted to having had sexual experiences. There were still a large proportion of the respondents who were not aware of STDs other than syphilis and HIV/AIDS and the means of transmission, such as multiple sex partners, including those who claimed to be sexually active. Thus there is a need for more concerted efforts to disseminate information on STDs and transmission methods to a wider audience in Malaysia, especially youths in rural areas. PMID:23480474

Awang, Halimah; Wong, Li Ping; Jani, Rohana; Low, Wah Yun

2013-03-12

284

Operational sex ratio and density do not affect directional selection on male sexual ornaments and behavior.  

PubMed

Demographic parameters including operational sex ratio (OSR) and population density may influence the opportunity for, and strength of sexual selection. Traditionally, male-biased OSRs and high population densities have been thought to increase the opportunity for sexual selection on male sexual traits due to increased male competition for mates. Recent experimental evidence, however, suggests that male-biased OSRs might reduce the opportunity for sexual selection due to increased sexual coercion experienced by females. How OSR, density, and any resultant changes in the opportunity for sexual selection actually affect selection on male sexual traits is unclear. In this study, we independently manipulated OSR and density in the guppy (Poecilia reticulata) without altering the number of males present. We recorded male and female behavior and used DNA microsatellite data to assign paternity to offspring and estimate male reproductive success. We then used linear selection analyses to examine the effects of OSR and density on directional sexual selection on male behavioral and morphological traits. We found that females were pursued more by males in male-biased treatments, despite no change in individual male behavior. There were no differences in sexual behavior experienced by females or performed by males in relation to density. Neither OSR nor density significantly altered the opportunity for sexual selection. Also, Although there was significant multivariate linear selection operating on males, neither OSR nor density altered the pattern of sexual selection on male traits. Our results suggest that differences in either OSR or density (independent of the number of males present) are unlikely to alter directional evolutionary change in male sexual traits. PMID:18067568

Head, Megan L; Lindholm, Anna K; Brooks, Robert

2007-12-06

285

Identification of a sequence-tagged site (STS) marker linked to a restorer gene for Ogura cytoplasmic male sterility in radish ( Raphanus sativus L.) by non-radioactive AFLP analysis  

Microsoft Academic Search

To identify DNA markers linked to a fertility restorer (Rf) genefor Ogura cytoplasmic male sterility in radish (Raphanus sativus L.),a non-radioactive, amplified fragment length polymorphism (AFLP) analysiswas performed on bulked DNA samples from male-sterile and male-fertileradishes. Ten male-fertile and 10 male-sterile plants selected arbitrarilyfrom an F2 population made by selfing of F1 plant from a crossbetween a male-sterile (`MS-Gensuke') plant

Seiji Murayama; Toshiyuki Habuchi; Hiroshi Yamagishi; Toru Terachi

2003-01-01

286

Exploring Family Factors and Sexual Behaviors in a Group of Black and Hispanic Adolescent Males.  

ERIC Educational Resources Information Center

|Examined family factors influencing sexual behavior among black and Hispanic adolescent males from San Bernardino County, California's 1996 Youth Survey. Family structure, parent sexual behaviors, and peer sexual norms closely associated with adolescent sexual attitudes and behaviors. Having a sibling who was a teen parent significantly…

Rucibwa, Naphtal Kaberege; Modeste, Naomi; Montgomery, Susan; Fox, Curtis A.

2003-01-01

287

Sexual Behavior in High-Functioning Male Adolescents and Young Adults with Autism Spectrum Disorder  

ERIC Educational Resources Information Center

Group home caregivers of 24 institutionalized, male, high-functioning adolescents and young adults with Autism Spectrum Disorder, were interviewed with the Interview Sexuality Autism. Most subjects were reported to express sexual interest and to display some kind of sexual behavior. Knowledge of socio-sexual skills existed, but practical use was…

Hellemans, Hans; Colson, Kathy; Verbraeken, Christine; Vermeiren, Robert; Deboutte, Dirk

2007-01-01

288

Lack of Opioid or Dopaminergic Effects on Unconditioned Sexual Incentive Motivation in Male Rats  

Microsoft Academic Search

The effects of dopaminergic and opioidergic drugs on sexual incentive motivation were evaluated in sexually inexperienced male rats subjected to a choice procedure. Various parameters of ambulatory activity were recorded as well. Two drugs stimulating dopaminergic neurotransmission, amphetamine and apomorphine, failed to affect sexual incentive motivation, although ambulatory activity was enhanced by amphetamine. The dopamine antagonist cis(Z)-flupenthixol reduced sexual incentive

Anders Ågmo

2003-01-01

289

Parenting Processes Related to Sexual Risk-Taking Behaviors of Adolescent Males and Females.  

ERIC Educational Resources Information Center

Presents research on the relationship of parenting processes to adolescent sexual behavior. An interaction effect was observed between parental communication about sexual issues and perceived parental support for males. For females, parental psychological control increased the odds that a sexually active daughter would take more sexual risks.…

Rodgers, Kathleen Boyce

1999-01-01

290

Sexual experience of male rats influences anxiety-like behavior and androgen levels  

Microsoft Academic Search

There is a wide body of literature to suggest that sexual experience may influence androgen secretion in various species, in turn, androgens may also influence anxiety. We hypothesized that sexual experience may alter anxiety behavior and secretion of endogenous androgens. Experiment 1: anxiety behavior of rats with a history of sexual experience was compared to that of sexually-inexperienced, naïve male

Kassandra L. Edinger; Cheryl A. Frye

2007-01-01

291

Intimacy, Orgasm Likelihood, and Conflict Predict Sexual Satisfaction in Heterosexual Male and Female Respondents  

Microsoft Academic Search

Anonymous data provided by 417 female and 179 male sexually active heterosexual respondents showed that in long term sexual relationships, sexual satisfaction was positively correlated with two different intimacy variables, the respondent's orgasm likelihood, and negatively correlated with conflict in the relationship. Multiple linear regression permitted us to measure the effect sizes of these variables as predictors of sexual satisfaction.

R. Vernon Haning; Stephen L. OKeefe; Elizabeth J. Randall; Martin J. Kommor; Elaine Baker; Robert Wilson

2007-01-01

292

Sexual objectification and the construction of whiteness in the gay male community  

Microsoft Academic Search

This paper presents interview data and media analysis on the gay male community in the USA. It describes how sexual objectification is more than the outcome of racism in the gay male community. Sexual objectification of gay men of colour in the USA produces a white sexual community. Ideologies of inclusivity and non?discrimination blind white gay men to the harmful

Niels Teunis

2007-01-01

293

Influence of Eurycoma longifolia on the copulatory activity of sexually sluggish and impotent male rats  

Microsoft Academic Search

Aim of the studyThe root of Eurycoma longifolia Jack, native to South East Asia, has long been used as a male aphrodisiac remedy to treat sexual disorders.In the study we evaluated the influence of Eurycoma longifolia Jack on sexual behavior (including both motivation and copulatory performance) of sexually sluggish and impotent male rats.

P. Zanoli; M. Zavatti; C. Montanari; M. Baraldi

2009-01-01

294

Multiple sexual ornaments in satin bowerbirds: ultraviolet plumage and bowers signal different aspects of male quality  

Microsoft Academic Search

Much attention has been devoted to understanding the evolution of elaborate male ornaments and how they may signal male quality. However, the evolution of multicomponent sexual signals remains poorly understood, and past research on this type of signaling has been largely theoretical. Satin bowerbirds, Ptilonorhynchus violaceus, are polygynous, are sexually dichromatic, and construct sexually selected display structures (bowers): a model

Ste´phanie M. Doucet; Robert Montgomerie

2003-01-01

295

Theoretical Perspectives of Male Sexual Abuse: Conceptualization of a Case Study  

Microsoft Academic Search

The purpose of this article is to demonstrate the traumatic impact that sexual abuse can have on a young male's development by addressing mediating dispositions that can render a child vulnerable to the effects of sexual abuse. Consideration is given to three different theoretical perspectives that are not exclusive to male victims but shed light on the impact that sexual

Terry Diamanduros; Clare E. Cosentino; P. Dawn Tysinger; Jeffrey A. Tysinger

2012-01-01

296

Physical and gene mapping of chloroplast DNA from normal and cytoplasmic male sterile (radish cytoplasm) lines of Brassica napus  

Microsoft Academic Search

Using the restriction endonucleases SaII, SmaI, BgII and KpnI, physical maps of chloroplast DNA isolated from normal and cytoplasmic male sterile (radish cytoplasm) lines of B. napus were constructed and compared. In this study, a rapid and simple procedure was developed for the isolation of chloroplast DNA restriction fragments from low gelling temperature agarose gels.

Fernand Vedel; Chantal Mathieu

1983-01-01

297

INHERITANCE AND ALLELIC RELATIONSHIPS OF FERTILITY RESTORATION GENES FOR TWO NEW SOURCES OF MALE-STERILE CYTOPLASM IN SUNFLOWER  

Technology Transfer Automated Retrieval System (TEKTRAN)

The inheritance of fertility restoration of six mitomycin C and streptomycin induced cytoplasmic male-sterile (cms) mutants and one cms line derived from Native American cultivar PI 432513 was evaluated. These cms sources were also compared with the commercially used cms PET1 (Helianthus petiolaris ...

298

Synthesis of hexaploid (AABBCC) somatic hybrids: a bridging material for transfer of ‘tour’ cytoplasmic male sterility to different Brassica species  

Microsoft Academic Search

Most of the alloplasmic cytoplasmic male sterility (CMS) systems are known to be associated with a number of floral abnormalities that result from nuclear-cytoplasmic incompatibilities. One such system, ‘tour’, which is derived from Brassica tournefortii, induces additional floral abnormalities and causes chlorosis in Brassica spp. While the restorer for this CMS has been reported to be present in B. napus,

N. Arumugam; A. Mukhopadhyay; V. Gupta; D. Pental; A. K. Pradhan

1996-01-01

299

Fertility restoration of the sorghum A3 male-sterile cytoplasm through a sporophytic mechanism derived from sudangrass  

Technology Transfer Automated Retrieval System (TEKTRAN)

Fertility restoration of sorghum lines carrying the IS1112C (A3 group) sorghum male-sterile cytoplasm in the line A3Tx398 has been documented as a two-gene gametophytic mechanism involving complementary action of restoring alleles designated Rf3 and Rf4, as derived from IS1112C. Fertility restorat...

300

Frequencies of genetical factors determining male sterility in onion (Allium cepa L.) and their significance for the breeding of hybrids  

Microsoft Academic Search

In selections of some more or less commonly grown onion varieties in the Netherlands the frequencies of genetical factors governing male sterility were determined. In the leading Dutch variety Rijnsburger the chromosomal factor ms was found to occur in a frequency of over 0.95 and the cytoplasmic factor S in a frequency of less than 0.01.

Q. P. Meer; J. L. Bennekom

1971-01-01

301

Mutations at specific atp6 codons which cause human mitochondrial diseases also lead to male sterility in a plant  

Microsoft Academic Search

Defects in the human mitochondrial genetic system result in some diseases. These disorders are the result of rearrangements or point mutations in mitochondrial genes. In higher plants mutations and rearrangements in the mitochondrial DNA are believed to cause cytoplasmic male sterility (CMS), a mitochondrially inherited inability to produce viable pollen. In sorghum, formation of CMS is strongly correlated with anther-specific

Frank Kempken; Werner Howad; Daryl R. Pring

1998-01-01

302

The maize mitochondrial genome of the normal type and the cytoplasmic male sterile type T have very different organization  

Microsoft Academic Search

The normal type (N) and cytoplasmic male sterile type T (cmsT) maize mitochondrial genomes are 570 kb and 540 kb in length respectively. Detailed hybridization studies have been undertaken to compare the sequence complexity and variation between the two genomes (genotype B37). They have approximately 500 kb of common sequences but there is considerable variation in sequence organization which can

Cristiane Fauron; Marie Havlik

1989-01-01

303

Mitochondrial DNA duplication\\/deletion events and polymorphism of the C group of male sterile maize cytoplasms  

Microsoft Academic Search

Five accessions of members of the C group of male sterile maize cytoplasms (BB, C, ES, PR, and RB) in two nuclear backgrounds (A619 and A632) were examined to elucidate the nature of mitochondrial genome diversity within a related group of cytoplasms. Cosmid and plasmid clones carrying single copy and recombinationally active sequences from N and S cytoplasms of maize

D. R. Pring; D. M. Lonsdale; V. E. Gracen; A. G. Smith

1987-01-01

304

Identification of an 85-kb DNA fragment containing pms1 , a locus for photoperiod-sensitive genic male sterility in rice  

Microsoft Academic Search

Photoperiod-sensitive genic male-sterile rice has a number of desirable characteristics for hybrid rice production. Previous studies identified pms1, located on chromosome 7, as a major locus for photoperiod-sensitive genic male sterility. The objective of this study was to localize the pms1 locus to a specific DNA fragment by genetic and physical mapping. Using 240 highly sterile individuals and a random

N. Liu; Y. Shan; F. Wang; C. Xu; K. Peng; X. Li; Qifa Zhang

2001-01-01

305

Childhood experiences of incarcerated male child sexual abusers.  

PubMed

While numerous efforts have been made to understand the impact of child sexual abuse, little has been done to examine the childhood experiences of those who abuse children. Child sexual abusers have been studied from quantitative perspectives using behavioral checklists, parental-bonding surveys, and sexual history questionnaires. The purpose of this study was to explore incarcerated child sexual abusers' recollections of their childhood experiences using the descriptive existential lens of phenomenology. Eight incarcerated male child sexual abusers described their childhood from existential perspectives of lived space, lived other, lived body, and lived time via face-to-face semi-structured interviews. Analysis was accomplished through the qualitative, descriptive method of Max van Manen. Rich descriptions of the participants' insights into their daily childhood life experiences that shaped their self-concepts and contributed to their adult behaviors were gathered. Four major themes were identified: (1) failure to root, (2) what you see is what you learn, (3) stupid is as stupid does, and (4) life's moments. Data from this study suggest that the experiences of childhood significantly contribute to an adult self-concept that can be distorted by the lack of a secure home space, maladaptive relationships, internalization of inappropriate behavior, and a lack of significant family development. This study explores the psychosocial and behavioral consequences of early childhood experiences. The findings support the need for family and psychological mental health nurse practitioners to be more aware of early home environments; improve their assessment of children's developing self-concept and the potential for abusive relationships. PMID:20854041

Garrett, Linda H

2010-10-01

306

Alloplasmic male sterility in Brassica napus (CMS 'Tournefortii-Stiewe') is associated with a special gene arrangement around a novel atp9 gene  

Microsoft Academic Search

To identify regions of the mitochondrial genome potentially involved in the expression of alloplasmic 'Tournefortii-Stiewe' cytoplasmic male sterility (CMS) in Brassica napus, transcripts of 25 mitochondrial genes were analysed in fertile and near isogenic male-sterile plants (BC 8 generation). Differences were detected in the transcription of genes for subunit 9 of ATP synthase ( atp9), cytochrome b ( cob) and

J.-H. Dieterich; H.-P. Braun; U. K. Schmitz

2003-01-01

307

Understanding Reversals in the Relative Strength of Sexual Selection on Males and Females: A Role for Sperm Competition?  

Microsoft Academic Search

Sperm competition affects sexual selection intensity on males, but models suggest it cannot affect the relative intensity of sexual selection on males compared to females. However, if sperm competition depresses the payoff for male multiple mating, it could affect the relative intensity of sexual selection and even cause sexual selection to be more intense on females than males (reversal of

2002-01-01

308

Cloning and sequencing of RAPD fragments amplified from mitochondrial DNA of male-sterile and male-fertile cytoplasm of sugar beet (Beta vulgaris L.)  

Microsoft Academic Search

Mitochondrial DNA fragments of two nearly isogenic lines of sugar beet (Beta vulgaris L.) were amplified by RAPD analysis. A number of fragments, most of them unique to either the male-sterile or the male-fertile\\u000a cytoplasm, were selected for cloning and sequencing. One fragment was present in the PCR fingerprint pattern of both cytoplasms,\\u000a whereas five of the selected fragments were

M. Lorenz; A. Weihe; T. Börner

1997-01-01

309

Transfer, Perception, and Activity of Male Pheromone of Acrolepiopsis assectella with Special Reference to Conspecific Male Sexual Inhibition  

Microsoft Academic Search

In the leek moth, Acrolepiopsis assectella, the male, stimulated by a calling female, produces a sexual pheromone that is active on the female. The male-produced pheromone blend contains eight alkanes previously isolated from the male hair-pencils. We used EAG techniques to study the effect of the pheromone on females reared on leek or on artificial diet and on males reared

C. Lecomte; E. Thibout; D. Pierre; J. Auger

1998-01-01

310

Sexual experience affects reproductive behavior and preoptic androgen receptors in male mice  

PubMed Central

Reproductive behavior in male rodents is made up of anticipatory and consummatory elements which are regulated in the brain by sensory systems, reward circuits and hormone signaling. Gonadal steroids play a key role in the regulation of male sexual behavior via steroid receptors in the hypothalamus and preoptic area. Typical patterns of male reproductive behavior have been characterized, however these are not fixed but are modulated by adult experience. We assessed the effects of repeated sexual experience on male reproductive behavior of C57BL/6 mice; including measures of olfactory investigation of females, mounting, intromission and ejaculation. The effects of sexual experience on the number of cells expressing either androgen receptor (AR) or estrogen receptor alpha (ER?) in the primary brain nuclei regulating male sexual behavior was also measured. Sexually experienced male mice engaged in less sniffing of females before initiating sexual behavior and exhibited shorter latencies to mount and intromit, increased frequency of intromission, and increased duration of intromission relative to mounting. No changes in numbers of ER?-positive cells were observed, however sexually experienced males had increased numbers of AR-positive cells in the medial preoptic area (MPOA); the primary regulatory nucleus for male sexual behavior. These results indicate that sexual experience results in a qualitative change in male reproductive behavior in mice that is associated with increased testosterone sensitivity in the MPOA and that this nucleus may play a key integrative role in mediating the effects of sexual experience on male behavior.

Swaney, William T.; Dubose, Brittany N.; Curley, James P.; Champagne, Frances A.

2012-01-01

311

Male sexual health during adolescence and young adulthood: contemporary issues  

Microsoft Academic Search

The sexual health of young men is often neglected by health care systems that assume healthy developmental trajectories. Clinical morbidities and sexual concerns are not uncommon among sexually emerging young men. Sexually-transmitted infections, transient sexual dysfunction and lack of screening for genitourinary abnormalities contribute to this morbidity. This article discusses common sexual issues and concerns of adolescents and young adult

James A. Farrow

2009-01-01

312

Assessing the putative roles of X-autosome and X-Y interactions in hybrid male sterility of the Drosophila bipectinata species complex.  

PubMed

Interspecific F1 hybrid males of the Drosophila bipectinata species complex are sterile, while females are fertile, following Haldane's rule. A backcross scheme involving a single recessive visible marker on the X chromosome has been used to assess the putative roles of X-autosome and X-Y interactions in hybrid male sterility in the D. bipectinata species complex. The results suggest that X-Y interactions are playing the major role in hybrid male sterility in the crosses D. bipectinata x D. parabipectinata and D. bipectinata x D. pseudoananassae, while X-autosome interactions are largely involved in hybrid male sterility in the crosses D. malerkotliana x D. bipectinata and D. malerkotliana x D. parabipectinata. However, by using this single marker it is not possible to rule out the involvement of autosome-autosome interactions in hybrid male sterility. These findings also lend further support to the phylogenetic relationships among 4 species of the D. bipectinata complex. PMID:17893743

Mishra, Paras Kumar; Singh, Bashisth Narayan

2007-07-01

313

Masculinization of Gene Expression Is Associated with Exaggeration of Male Sexual Dimorphism  

PubMed Central

Gene expression differences between the sexes account for the majority of sexually dimorphic phenotypes, and the study of sex-biased gene expression is important for understanding the genetic basis of complex sexual dimorphisms. However, it has been difficult to test the nature of this relationship due to the fact that sexual dimorphism has traditionally been conceptualized as a dichotomy between males and females, rather than an axis with individuals distributed at intermediate points. The wild turkey (Meleagris gallopavo) exhibits just this sort of continuum, with dominant and subordinate males forming a gradient in male secondary sexual characteristics. This makes it possible for the first time to test the correlation between sex-biased gene expression and sexually dimorphic phenotypes, a relationship crucial to molecular studies of sexual selection and sexual conflict. Here, we show that subordinate male transcriptomes show striking multiple concordances with their relative phenotypic sexual dimorphism. Subordinate males were clearly male rather than intersex, and when compared to dominant males, their transcriptomes were simultaneously demasculinized for male-biased genes and feminized for female-biased genes across the majority of the transcriptome. These results provide the first evidence linking sexually dimorphic transcription and sexually dimorphic phenotypes. More importantly, they indicate that evolutionary changes in sexual dimorphism can be achieved by varying the magnitude of sex-bias in expression across a large proportion of the coding content of a genome.

Pointer, Marie A.; Harrison, Peter W.; Wright, Alison E.; Mank, Judith E.

2013-01-01

314

Sexually selected nest-building -Pomatoschistus minutus males build smaller nest-openings in the presence of sneaker males  

Microsoft Academic Search

Both natural selection and sexual selection may act on nest-building. We tested experimentally how different regimes of egg-predation and male-male competition influence nest-building before mating, using the marine fish sand goby, Pomatoschistus minutus. Males with sneaker males present built the smallest nest-openings, smaller than males held alone or with Pomatoschistus microps males (which may predate eggs and compete over nest-sites

O. Svensson; C. Kvarnemo

2003-01-01

315

Age-Concordant and Age-Discordant Sexual Behavior Among Gay and Bisexual Male Adolescents  

Microsoft Academic Search

There is evidence that risks for HIV and sexually transmitted infections among adolescent females are higher for those with\\u000a older male sexual partners. Yet, little empirical research has been conducted with male adolescents who engage in sexual activity\\u000a with older men. In this article, we summarize in a number of ways the range of sexual activity reported by an ethnically

Douglas BruceGary; Gary W. Harper; M. Isabel Fernández; Omar B. Jamil

316

Perceptions of male victims in depicted sexual assaults: A review of the literature  

Microsoft Academic Search

In recent years there has been a steady increase in the amount of literature on perceptions of male victim of sexual assault. Much of this research focuses around the concept of victim blame. This paper reviews the research on perceptions of male victims of sexual assault, with particular reference to victim blame for male rape. The paper considers the conceptual

Michelle Davies; Paul Rogers

2006-01-01

317

Emergence of displacement activities in the male rat following thwarting of sexual behavior  

Microsoft Academic Search

Conducted 7 experiments with Wistar rats, who were observed in a mating area equipped with a water spout, that revealed the emergence of displacement drinking and hindlimb scratching in noncopulating castrated males and in males with medial preoptic (MPO) lesions exposed to sexually attractive stimulus females. By contrast, sexually quiescent males in the postejaculatory refractory period showed no evidence of

Stefan Hansen; Louise J. Drake af Hagelsrum

1984-01-01

318

Sexual and substance use acts of gay and bisexual male adolescents in New York city  

Microsoft Academic Search

Lifetime and current sexual and substance use behaviors were examined among 131 predominantly Hispanic and Black gay and bisexual adolescent males in New York City. Many youths engaged in anal sex with males (80%), and 22% bartered sex for money or drugs. Condom use with male partners typically was initiated one year after a youth became sexually active, was more

Margaret Rosario; Cheryl Koopman; Steven C. Dopkins; Mark Davies

1994-01-01

319

Sexual-Discrimination Learning in Male Japanese Quail (Coturnix coturnix japonica )  

Microsoft Academic Search

We investigated how male Japanese quail (Coturnix coturnix japonica) learn through extensive social and sexual experience to discriminate between male and female conspecifics. Opportunity for heterosexual copulation was important for this learning, but even extensive copulatory opportunity was not sufficient to produce a sexual discrimination; subjects also required exposure to other males. Exposure to females after copulatory opportunity did not

Susan Nash; Michael Domjan; Martha Askins

1989-01-01

320

Genetic Vasectomy--Overexpression of Prm1-EGFP Fusion Protein in Elongating Spermatids Causes Dominant Male Sterility in Mice  

PubMed Central

Summary Transgenic mice are vital tools in both basic and applied research. Unfortunately, the transgenesis process as well as many other assisted reproductive techniques involving embryo transfer rely on vasectomized males to induce pseudopregnancy in surrogate mothers. Vasectomy is a surgical procedure associated with moderate pain and must be carried out under full anaesthesia by qualified personnel. Eliminating the need for vasectomy would be beneficial from the economic and animal welfare point of view. Our aim was to develop a transgene-based alternative to the surgical vasectomy procedure. We generated several transgenic mouse lines expressing a Protamine-1 (Prm1) EGFP fusion protein under the transcriptional and translational regulatory control of Prm1. Male mice from lines showing moderate transgene expression were fully fertile whereas strong overexpression of the Prm1-EGFP fusion protein resulted in complete and dominant male sterility without affecting the ability to mate and to produce copulatory plugs. Sterility was due to impaired spermatid maturation affecting sperm viability and motility. Furthermore, sperm having high Prm1-EGFP levels failed to support preimplantation embryonic development following Intracytoplasmic Sperm Injection (ICSI). The “genetic vasectomy system” was further improved by genetically linking the dominant male sterility to ubiquitous EGFP expression in the soma as an easy phenotypic marker enabling rapid genotyping of transgenic males and females. This double transgenic approach represents a reliable and cost-effective “genetic vasectomy” procedure making the conventional surgical vasectomy methodology obsolete.

Haueter, Sabine; Kawasumi, Miyuri; Asner, Igor; Brykczynska, Urszula; Cinelli, Paolo; Moisyadi, Stefan; Burki, Kurt; Peters, Antoine H.F.M.; Pelczar, Pawel

2012-01-01

321

Sexual maturation in male prairie voles: Effects of the social environment  

Microsoft Academic Search

MATEO, J. M., W. G. HOLMES, A. M. BELL AND M. TURNER. Sexual maturation in male prairie voles: Effects of the social environment. PHYSIOL BEHAV 56(2) 299-304, 1994.--The effects of various social contexts on sexual maturation in captive male prairie voles were investigated. Sexual maturity was assessed as the ability of a young male to produce urine capable of activating

J. M. MATEO; W. G. HOLMES; ANGELA M. BELL; MARJUT TURNER

1994-01-01

322

Cytoplasmic male sterility in sunflower: origin, inheritance, and frequency in natural populations.  

PubMed

Cytoplasmic male sterility (CMS) in commercial sunflower hybrids is thought to be derived from a related wild species, Helianthus petiolaris, yet CMS lines are known to carry the chloroplast DNA genotype of H. annuus. To clarify the origin of sunflower CMS, we developed a polymerase chain reaction-based strategy for detecting CMS in sunflower and surveyed more than 1,200 plants representing 55 accessions of H. annuus and 26 accessions of H. petiolaris. We also tested 160 progeny from three crosses for strict maternal inheritance of organelle DNAs to determine if the apparent discrepancy in the species donor of the mitochondrial DNA and chloroplast DNA genotypes in CMS lines might result from low-frequency maternal or biparental inheritance of either organelle. No CMS cytotypes were observed in natural populations of either H. annuus or H. petiolaris, and strict maternal inheritance of organelle DNA was observed. These data provide little insight, therefore, into the origin and population genetics of CMS in natural populations of sunflower, except that the evidence for strict maternal inheritance of organelles in sunflower makes it unlikely that the mtDNA and cpDNA genotypes in CMS lines were derived from different species. Nonetheless, the primers developed for assaying organelle DNA variation in sunflower may be useful tools for plant breeding programs, cytotype identification, and systematic and evolutionary studies in the domesticated sunflower and its relatives. PMID:8014465

Rieseberg, L H; Van Fossen, C; Arias, D; Carter, R L

323

MALE STERILITY1 Is Required for Tapetal Development and Pollen Wall Biosynthesis[W][OA  

PubMed Central

The Arabidopsis thaliana MALE STERILITY1 (MS1) gene is critical for viable pollen formation and has homology to the PHD-finger class of transcription factors; however, its role in pollen development has not been fully defined. We show that MS1 transcription appears to be autoregulated by the wild-type MS1 transcript or protein. Using a functional green fluorescent protein (GFP) fusion to analyze the temporal and spatial expression of MS1, we demonstrate that the MS1:GFP protein is nuclear localized within the tapetum and is expressed in a developmentally regulated manner between late tetraspore and microspore release, then rapidly breaks down, probably by ubiquitin-dependent proteolysis. Absence of MS1 expression results in changes in tapetal secretion and exine structure. Microarray analysis has shown that 260 (228 downregulated and 32 upreglated) genes have altered expression in young ms1 buds. These genes are primarily associated with pollen wall and coat formation; however, a number of transcription factors and Cys proteases have also been identified as the putative primary regulatory targets of MS1. Ectopic expression of MS1 alters transcriptional regulation of vegetative gene expression, resulting in stunted plants with increased levels of branching, partially fertile flowers and an apparent increase in wall material on mature pollen. MS1 therefore plays a critical role in the induction of pollen wall and pollen coat materials in the tapetum and, ultimately, the production of viable pollen.

Yang, Caiyun; Vizcay-Barrena, Gema; Conner, Katie; Wilson, Zoe A.

2007-01-01

324

Mitochondrial mutation impairs cytoplasmic male sterility rice in response to H?O? stress.  

PubMed

Cytoplasmic male sterility (CMS) is a phenomenon widely observed in various plant species characterized with disrupted anther development caused by mitochondrial mutation. CMS is becoming a model system for the investigations of nucleus-cytoplasmic interaction. To reveal the possible effects of CMS genes on plant growth in adverse environment, plant development and biochemical characters of mitochondria from Honglian (HL)-CMS line Yuetai A and maintainer Yuetai B treated with H(2)O(2) were analyzed. Results showed that 40-60mM H(2)O(2) significantly inhibits rice seedling development and growth. When treated with H(2)O(2), ATP content and mitochondrial membrane potential in Yuetai A decreased significantly faster than those of Yuetai B. These biochemical changes were accompanied by the severe nuclear DNA fragmentation and the release of mitochondrial cytochrome c in the leaf cells of Yuetai A. In addition, the antioxidative enzyme activities and mitochondrial electron transfer chain complexes were significantly down-regulated. Disturbance of the biochemical indexes indicate that HL-CMS line is more susceptible to H(2)O(2) stress than the maintainer line, the deleterious effects caused by the CMS-related ORFH79 peptide compromises the adaptability of HL-CMS line to the adverse environment. PMID:22921008

Li, Shaoqing; Wan, Cuixiang; Hu, Chaofeng; Gao, Feng; Huang, Qi; Wang, Kun; Wang, Ting; Zhu, Yingguo

2012-06-29

325

Characterization of a Novel Thermosensitive Restorer of Fertility for Cytoplasmic Male Sterility in Maize  

PubMed Central

S-type cytoplasmic male sterility (CMS-S) in maize is associated with high levels of a 1.6-kb RNA in mitochondria. This RNA contains two chimeric open reading frames (ORFs), orf355 and orf77. The previously described nuclear restorer-of-fertility allele Rf3 causes the processing of all transcripts that contain these chimeric ORFs. The Lancaster Surecrop-derived inbred line A619 carries a restorer that is distinct from Rf3 in that it selectively reduces only the CMS-S-specific 1.6-kb RNA. We have found that 10 additional Lancaster lines carry a single restoring allele traceable to either of two inbred lines, C103 and Oh40B. The C103 and Oh40B restorers are allelic to each other, but not to Rf3. Thus, this restoring allele, designated Rf9, represents a second naturally occurring CMS-S restorer in maize. Rf9 is a less effective restorer of fertility than is Rf3; its expression is influenced by both inbred nuclear background and temperature. Rf9 acts to reduce the amounts of orf355/orf77-containing linear mitochondrial subgenomes, which are generated by recombination of circular subgenomes with CMS-S-specific linear plasmids. The 1.6-kb RNA, which is transcribed only from linear ends, is correspondingly reduced.

Gabay-Laughnan, Susan; Kuzmin, Evgeny V.; Monroe, Jessica; Roark, Leah; Newton, Kathleen J.

2009-01-01

326

Increased vulnerability of hippocampal CA1 neurons to hypoperfusion in ataxia and male sterility (AMS) mouse.  

PubMed

The nna1 gene mutation is associated with spontaneous degeneration of cerebellar Purkinje cells and germ cells in Ataxia and Male Sterility (AMS) mouse. Since nna1 is also expressed in hippocampal neurons, we investigated their vulnerability to hypoperfusion in AMS mouse. Eight-week-old male wild type (WT) and AMS mice were subjected to bilateral common carotid artery occlusion (BCCAO) for 10 min and sacrificed 1, 3, 7 and 28 days after BCCAO. Nissl staining revealed the neuronal cell loss and pyknotic change in the CA1 of AMS mice. TUNEL(+) apoptotic cells were found in the area at 7 days in AMS mice. Bcl-2 mRNA and protein in WT hippocampus were increased, while they were not increased in AMS. Bax mRNA was increased in AMS. Moreover, Bax activation was immunohistochemically demonstrated only in AMS at 3 and 7 days after BCCAO. An oxidative DNA damage marker, 8-hydroxydeoxyguanosine-positive cells were increased in both strains at 1 day; decreased in WT at 3 days but remained high in AMS. BCCAO increased glutathione, an antioxidant, in WT, but not in AMS at 3 days. The mRNA level of mitochondrial uncoupling protein 2, a regulator of oxidative stress, was increased only in WT at 1 day. Nna1 mRNA was similarly expressed in WT and AMS, but the protein was undetectable in AMS. Thus, our results indicate the increased vulnerability of hippocampal CA1 neurons of AMS mice to cerebral hypoperfusion could be due to an imbalance between oxidative stress and antioxidative defense system. PMID:23219973

Liang, Xueyun; Nagai, Atsushi; Sheikh, Abdullah Md; Wang, Hui; Mitaki, Shingo; Araki, Asuka; Maruyama, Riruke; Harada, Takayuki

2012-12-03

327

Characterization of a male sterile related gene BcMF15 from Brassica campestris ssp. chinensis.  

PubMed

Data from cDNA-AFLP analysis based on the genome-wide transcriptional profiling on the flower buds of the male meiotic cytokinesis (mmc) mutant and its wild-type of Brassica campestris L. ssp. chinensis Makino, syn. B. rapa L. ssp. chinensis, indicated that mutation of the MMC gene resulted in changes in expression of a variety of genes. A transcript-derived fragment specifically accumulated in the wild-type flower buds was isolated, and the corresponding full-length cDNA and DNA was subsequently amplified. Bioinformatical analyses of this gene named BcMF15 (GenBank accession number EF600901) showed that it encoded a protein with 103 amino acids. The BcMF15 had a 88% nucleotide similarity to a lipid transfer protein-like gene. Moreover, sequence prediction indicated that BcMF15 might encode a membrane protein with a signal peptide at the N-terminus. Meanwhile, six domains were predicted in the deduced BcMF15 protein, such as the AAI domain existing in some crucial proteins of pollen development-preferential, signal peptide, transmembrane domain, vWF domain, ZnF_C4 domain, and Tryp_alpha_amyl domain. Spatial and temporal expression patterns analysis by RT-PCR indicated that BcMF15 was exclusively expressed in the fertile line, which indicated this gene is male sterile related. Phylogenetic analysis in Cruciferae revealed that the BcMF15 was relative conservative in evolution. We suppose BcMF15 may be a critical molecule in the transmembrane transportation and signal transduction during microspore development. PMID:18034318

Tian, Aimei; Cao, Jiashu; Huang, Li; Yu, Xiaolin; Ye, Wanzhi

2007-11-22

328

Genetic Architecture of Hybrid Male Sterility in Drosophila: Analysis of Intraspecies Variation for Interspecies Isolation  

Microsoft Academic Search

Background: The genetic basis of postzygotic isolation is a central puzzle in evolutionary biology. Evolutionary forces causing hybrid sterility or inviability act on the responsible genes while they still are polymorphic, thus we have to study these traits as they arise, before isolation is complete. Methodology\\/Principal Findings: Isofemale strains of D. mojavensis vary significantly in their production of sterile F1

Laura K. Reed; Brooke A. LaFlamme; Therese A. Markow

2008-01-01

329

Transgenic male-sterile plant induced by an unedited atp9 gene is restored to fertility by inhibiting its expression with antisense RNA.  

PubMed Central

We have previously shown that the expression of an unedited atp9 chimeric gene correlated with male-sterile phenotype in transgenic tobacco plant. To study the relationship between the expression of chimeric gene and the male-sterile trait, hemizygous and homozygous transgenic tobacco lines expressing the antisense atp9 RNA were constructed. The antisense producing plants were crossed with a homozygous male-sterile line, and the F1 progeny was analyzed. The offspring from crosses between homozygous lines produced only male-fertile plants, suggesting that the expression antisense atp9 RNA abolishes the effect of the unedited chimeric gene. In fact, the plants restored to male fertility showed a dramatic reduction of the unedited atp9 transcript levels, resulting in normal flower development and seed production. These results support our previous observation that the expression of unedited atp9 gene can induce male sterility. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4

Zabaleta, E; Mouras, A; Hernould, M; Suharsono; Araya, A

1996-01-01

330

Restoring pollen fertility in transgenic male-sterile eggplant by Cre/loxp-mediated site-specific recombination system  

PubMed Central

This study was designed to control plant fertility by cell lethal gene Barnase expressing at specific developmental stage and in specific tissue of male organ under the control of Cre/loxP system, for heterosis breeding, producing hybrid seed of eggplant. The Barnase-coding region was flanked by loxP recognition sites for Cre-recombinase. The eggplant inbred/pure line (‘E-38') was transformed with Cre gene and the inbred/pure line (‘E-8') was transformed with the Barnase gene situated between loxp. The experiments were done separately, by means of Agrobacterium co-culture. Four T0 -plants with the Barnase gene were obtained, all proved to be male-sterile and incapable of producing viable pollen. Flowers stamens were shorter, but the vegetative phenotype was similar to wild-type. Five T 0 -plants with the Cre gene developed well, blossomed out and set fruit normally. The crossing of male-sterile Barnase-plants with Cre expression transgenic eggplants resulted in site-specific excision with the male-sterile plants producing normal fruits. With the Barnase was excised, pollen fertility was fully restored in the hybrids. The phenotype of these restored plants was the same as that of the wild-type. Thus, the Barnase and Cre genes were capable of stable inheritance and expression in progenies of transgenic plants.

2010-01-01

331

S2 episome of maize mitochondria encodes a 130-kilodalton protein found in male sterile and fertile plants  

PubMed Central

The mitochondrial genome of the S-type male-sterile cytoplasm of maize contains two linear episomes, S1 (6397 base pairs) and S2 (5453 base pairs). The S2 episome contains two large unidentified open reading frames, URF1 (3512 base pairs) and URF2 (1017 base pairs). We have demonstrated that a polypeptide with an apparent molecular mass of 130 kDa is the gene product of URF1. This polypeptide was first detected in Coomassie blue-stained protein gels of cms-S (where cms = cytoplasmic male sterile) but not in those of cms-T, cms-C, or normal mitochondrial proteins. The protein product of a translational fusion containing the 5? end of Escherichia coli lacZ and an internal segment from URF1 of S2 was recognized by antisera raised against the 130-kDa variant polypeptide. The mitochondria of fertile F1 hybrids of cms-S × Ky21 (the male parent carrying nuclear fertility restoration genes) contain as much of the 130-kDa protein as is found in cms-S mitochondria of sterile plants. Spontaneous fertile cytoplasmic revertants from cms-S in a WF9 nuclear background also synthesized the 130-kDa polypeptide. Therefore, the mere presence or absence of the URF1 gene product of S2 does not determine the fertility status of maize plants, because male sterile and male fertile (nuclear restored and revertant) plants can contain equivalent amounts of the 130-kDa polypeptide. Images

Zabala, G.; O'Brien-Vedder, C.; Walbot, V.

1987-01-01

332

Development of photoperiod-sensitive cytoplasmic male sterile (PCMS) wheat lines showing high male sterility under long-day conditions and high seed fertility under short-day conditions  

Microsoft Academic Search

A “two-line system” using photoperiod-sensitive cytoplasmic male sterility (PCMS) caused by Aegilops crassa cytoplasm under long-day photoperiods (?15 h) has been proposed as a means of producing hybrid varieties in common wheat\\u000a (Triticum aestivum). The PCMS line is maintained by self-pollination under short-day conditions, and hybrid seeds can be produced through outcrossing\\u000a of the PCMS line with a pollinator line under

Koji Murai; Ichiro Tsutui; Yuki Kawanishi; Shojiro Ikeguchi; Mikiko Yanaka; Naoyuki Ishikawa

2008-01-01

333

Male reproductive senescence: the price of immune-induced oxidative damage on sexual attractiveness in the blue-footed booby  

Microsoft Academic Search

Summary 1. In animals, male reproduction is commonly a function of sexual attractiveness, based on the expression of sexually dimorphic traits that advertise genuinely the male's quality. Male performance may decline with age because physiological functions underlying sexual attractiveness may be affected by senescence. 2. Here we show that a sexual signal (foot colour) declines with age, due probably to

ROXANA TORRES; ALBERTO VELANDO

2007-01-01

334

Localization and organization of tRNA genes on the mitochondrial genomes of fertile and male sterile lines of maize.  

PubMed

Maize mitochondrial (mt) tRNA genes were localized on the mt master circles of two fertile lines (WF9-N and B37-N) and of one cytoplasmic male sterile line (B37-cmsT) of maize. The three genomes contain 16 tRNA genes with 14 different anticodons which correspond to 13 amino acids. Out of these 16 tRNA genes, 6 show a high degree of homology with the corresponding chloroplast (cp) tRNA genes and were shown to originate from cp DNA insertions and to be expressed in the mitochondria. The organization of the mt tRNA genes in both fertile lines is similar. The same genes are found, in the same environment, as judged from the restriction maps, in fertile and male sterile lines that have the same nuclear background, but the relative organization of the mt tRNA genes on the master circle is completely different. PMID:1701208

Sangaré, A; Weil, J H; Grienenberger, J M; Fauron, C; Lonsdale, D

1990-09-01

335

Sexually arousing events and relapse to heroin-seeking in sexually experienced male rats.  

PubMed

We have shown previously, using a reinstatement procedure, that both priming injections of heroin and exposure to footshock stress reinstate heroin-taking behavior following prolonged drug-free periods. In the present study, we examined the effect of another highly arousing event, exposure to a sexually active female, on reinstatement of heroin-seeking. Male rats were first given sexual experience, being allowed to copulate on 4 occasions with sexually active females and were then trained to self-administer heroin (100 micrograms/kg per infusion, IV) for 4 3-h sessions/day for 5-6 days and 1 6-h session/day for an additional 6 days. Extinction sessions were then given for 4 days, 6-h/day, during which saline was substituted for heroin. On tests for reinstatement, males were presented with: 1. The wire-mesh side of an empty cage (baseline condition), 2. the sight, odor, and smell of a sexually inactive female, 3. the sight, odor, and smell of a female in heat, 4. a female in heat, and allowed to copulate, 5. intermittent footshock (15 min, 0.5 mA, 0.5 s on, mean off period of 40 s), or 6. a priming injection of heroin (0.25 mg/kg, SC). Reinstatement of heroin-taking behavior was observed after exposure to the priming injection of heroin and to footshock stress. Reinstatement of heroin-taking behavior was not induced by exposure to the females in any of the conditions. Thus, motivational arousal, as such, does not appear to be a sufficient stimulus for relapse to heroin-taking. PMID:9035267

Shaham, Y; Puddicombe, J; Stewart, J

1997-02-01

336

The Male-Sterility Polymorphism of Silene vulgaris: Analysis of Genetic Data From Two Populations and Comparison With Thymus vulgaris  

Microsoft Academic Search

Results are given of genetic studies of male sterility using plants from two natural populations from Sussex, England. Both populations have substantial frequencies of females, z0.25 in population 1 and 0.60 in population 3. As in the few other gynodioecious populations studied in detail, many genetic factors are present. In population 1, there are at least two, and more likely

D. Charlesworth; Valerie Laporte

337

Comparative analysis of mitochondrial genomes between a wheat K-type cytoplasmic male sterility (CMS) line and its maintainer line  

Microsoft Academic Search

Background  Plant mitochondria, semiautonomous organelles that function as manufacturers of cellular ATP, have their own genome that has\\u000a a slow rate of evolution and rapid rearrangement. Cytoplasmic male sterility (CMS), a common phenotype in higher plants, is\\u000a closely associated with rearrangements in mitochondrial DNA (mtDNA), and is widely used to produce F1 hybrid seeds in a variety\\u000a of valuable crop species.

Huitao Liu; Peng Cui; Kehui Zhan; Qiang Lin; Guoyin Zhuo; Xiaoli Guo; Feng Ding; Wenlong Yang; Dongcheng Liu; Songnian Hu; Jun Yu; Aimin Zhang

2011-01-01

338

Callus formation and differentiation in tissue cultures of normal and cytoplasmic male sterile sorghum, pepper, sunflower, and tobacco  

Microsoft Academic Search

Summary  The primary goal of this study was to establish callus cultures of selected plant taxa containing both normal (N) and cytoplasmic\\u000a male-sterile (CMS) lines. A secondary goal was to attempt to differentiate the calli into whole flowering plants. Undifferentiated\\u000a and organ differentiated calli were produced in specific lines of N and CMS sorghum, pepper, sunflower, and tobacco. Calli\\u000a from both

Milton A. Rogers; Helen L. Gál; Harry T. Horner

1974-01-01

339

Molecular characterization of mitochondrial DNA of different subtypes of male-sterile cytoplasms of the sugar beet Beta vulgaris L  

Microsoft Academic Search

Mitochondrial (mt) DNA from eight cytoplasmic male-sterile (cms) lines of sugar beet from different breeding stations was investigated by restriction fragment analysis and Southern hybridization. All cms lines showed similar but not identical restriction and hybridization signal patterns, readily distinguishable from those of fertile (N) cytoplasm. Digestion of the mtDNA with BamHI, EcoRI, SalI, and XhoI revealed distinct differences between

A. Weihe; N. A. Dudareva; S. G. Veprev; S. I. Maletsky; R. Melzer; R. I. Salganik; Th. Börner

1991-01-01

340

Reversion of Texas male-sterile cytoplasm maize in culture to give fertile, T-toxin resistant plants  

Microsoft Academic Search

Plants carrying Texas male-sterile (Tms) cytoplasm are normally sensitive to Drechslera maydis T-toxin. Tissue cultures were initiated from immature embryos of maize carrying Tms-cytoplasm, and plants were regenerated after selection for resistance to T-toxin. Fertile, T-toxin resistant plants were obtained from the unselected control cultures as well as from the selected material. In addition, one regenerant from an unselected culture

R. I. S. Brettell; E. Thomas; D. S. Ingram

1980-01-01

341

Discovery of a novel cytoplasmic male-sterility and its restorer lines in radish ( Raphanus sativus L.)  

Microsoft Academic Search

A male-sterile (MS) radish (Raphanus sativus L.) was found in an accession collected from Uzbekistan. Unlike Ogura MS radishes in which no pollen grain is typically visible\\u000a during anthesis, a small number of pollen grains stuck together in the dehiscing anthers was observed in the newly identified\\u000a MS radish. Fluorescein diacetate tests and scanning electron micrographs showed that pollen grains

Young-Pyo Lee; Chaewan Lim; Hyojung Kim; Heerae Lim; YoungSoon Ahn; Soon-Kee Sung; Moo-Kyoung Yoon; Sunggil Kim

2008-01-01

342

Localization and organization of tRNA genes on the mitochondrial genomes of fertile and male sterile lines of maize  

Microsoft Academic Search

Maize mitochondrial (mt) tRNA genes were localized on the mt master circles of two fertile lines (WF9-N and B37-N) and of one cytoplasmic male sterile line (B37-cmsT) of maize. The three genomes contain 16 tRNA genes with 14 different anticodons which correspond to 13 amino acids. Out of these 16 tRNA genes, 6 show a high degree of homology with

Abdourahamane Sangaré; Jacques-Henry Weil; Jean-Michel Grienenberger; Christiane Fauron; David Lonsdale

1990-01-01

343

COMPARISON OF THE RESTRICTION ENDONUCLEASE DIGESTION PATTERNS OF MITOCHONDRIAL DNA FROM NORMAL AND MALE STERILE CYTOPLASMS OF ZEA MAYS L  

Microsoft Academic Search

High resolution gel electrophoresis has allowed the assignment of fragment number and molecular weight to EcoRI, Sal1 and PstI restriction fragments of mitochondrial DNA from B37 normal (N) and B37 T, C and S male sterile cytoplasmic types of maize. A minimum complexity of 450-475 kb has been established. Hybridization of cloned EcoRI fragments to restriction digests of total mitochondrial

KATHLEEN S. BORCK; VIRGINIA WALBOT

344

Sexual Risk Behaviors With Female and Male Partners Met in Different Sexual Venues Among Non-Gay-Identified, Nondisclosing MSMW  

Microsoft Academic Search

Despite considerable interest in the sexual behavior of nondisclosing men who have sex with men and women (MSMW), little is known about where they meet their male and female partners and whether their sexual risk behavior differs with partners met in different sexual venues (e.g., bars, Internet, parks). These issues were examined among 46 non-gay-identified MSMW who had not disclosed

Eric W. Schrimshaw; Karolynn Siegel; Martin J. Downing Jr

2010-01-01

345

Sexpectations: Male College Students' Views about Displayed Sexual References on Females' Social Networking Web Sites  

PubMed Central

Study Objective Sexual reference display on a social networking web site (SNS) is associated with self-reported sexual intention; females are more likely to display sexually explicit content on SNSs. The purpose of this study was to investigate male college students' views towards sexual references displayed on publicly available SNSs by females. Design Focus groups Setting One large state university Participants Male college students age 18–23 Interventions All tape recorded data was fully transcribed, then discussed to determine thematic consensus. Main Outcome Measures A trained male facilitator asked participants about views on sexual references displayed on SNSs by female peers and showed examples of sexual references from female's SNS profiles to facilitate discussion. Results A total of 28 heterosexual male participants participated in 7 focus groups. Nearly all participants reported using Facebook to evaluate potential female partners. Three themes emerged from our data. First, participants reported that displays of sexual references on social networking web sites increased sexual expectations. Second, sexual reference display decreased interest in pursuing a dating relationship. Third, SNS data was acknowledged as imperfect but valuable. Conclusion Females who display sexual references on publicly available SNS profiles may be influencing potential partners' sexual expectations and dating intentions. Future research should examine females' motivations and beliefs about displaying such references, and educate women about the potential impact of these sexual displays.

Moreno, Megan A.; Swanson, Michael J.; Royer, Heather; Roberts, Linda J.

2011-01-01

346

Sexual size dimorphism in fallow deer ( Dama dama ): do larger, heavier males gain greater mating success?  

Microsoft Academic Search

Sexual size dimorphism may evolve as a result of both natural and sexual selection. In polygynous mammals, the main factor resulting in the evolution of large body size in males is the advantage conferred during competition for mates. In this study, we examined whether sexual selection acts on body size in mature fallow bucks (Dama dama) by examining how the

Alan G. McElligott; Martin P. Gammell; Hilda C. Harty; Dean R. Paini; Desmond T. Murphy; James T. Walsh; Thomas J. Hayden

2001-01-01

347

Sexual Assault on the College Campus: The Role of Male Peer Support.  

ERIC Educational Resources Information Center

This book links research on two topics--sexual assault on North American college and university campuses and the role played by male peer support in such assaults. Disputing the notion that college campuses are safe havens from crime, the first chapter defines sexual assault, notes the incidence and prevalence of campus sexual assault, and…

Schwartz, Martin D.; DeKeseredy, Walter S.

348

Prevalence of and Risk Factors for Male Sexual Abuse: The Case of South Korea  

ERIC Educational Resources Information Center

This study examined the prevalence of and risk factors for sexual abuse of boys in South Korea by asking a national sample of 1,043 adult males whether they had experienced sexual abuse during childhood. The results indicate that 13.5% experienced at least one of the nine types of child sexual abuse assessed. In addition, the majority of the…

Han, In Young; Lee, Yongwoo; Yoo, Seo Koo; Hong, Jun Sung

2011-01-01

349

Are Males and Females Sexually Abused as Children Socially Anxious Adults?  

ERIC Educational Resources Information Center

It is well documented that childhood sexual abuse is associated with deleterious outcomes in the areas of anxiety, depression, and sexual functioning. However, very little research has been conducted to specifically investigate childhood sexual abuse's relationship to adult social anxiety in both males and females. Participants included 250…

Rojas, Ariz; Kinder, Bill N.

2009-01-01

350

Heterosexual Male Perpetrators of Childhood Sexual Abuse: A Preliminary Neuropsychiatric Model  

Microsoft Academic Search

This paper presents data from a series of prelimary neuropsychiatric studies, including neuropsychological, personality, sexual history, plethysmographic and neuroimaging investigations, on a sample of 22 male, heterosexual, nonexclusive pedophiles and 24 demographically similar healthy controls. A psychobiological model of pedophilia is proposed, positing that early childhood sexual abuse leads to neurodevelopmental abnormalities in the temporal regions mediating sexual arousal and

Lisa J. Cohen; Konstantin Nikiforov; Sniezyna Gans; Olga Poznansky; Pamela McGeoch; Carrie Weaver; Enid Gertmanian King; Ken Cullen; Igor Galynker

2002-01-01

351

Sexual Assault on the College Campus: The Role of Male Peer Support.  

ERIC Educational Resources Information Center

|This book links research on two topics--sexual assault on North American college and university campuses and the role played by male peer support in such assaults. Disputing the notion that college campuses are safe havens from crime, the first chapter defines sexual assault, notes the incidence and prevalence of campus sexual assault, and…

Schwartz, Martin D.; DeKeseredy, Walter S.

352

A mark-recapture study of male Colletes cunicularius bees: implications for pollination by sexual deception  

Microsoft Academic Search

An unusual pollination strategy is pollination by sexual deception in which orchids sexually attract male insects as pollinators. One gap in knowledge concerns the pattern and extent of pollinator movement among these sexually deceptive flowers and how this translates to pollen and gene flow. Our aim was to use mark and recapture techniques to investigate the behavior and movement of

Rod Peakall; Florian P. Schiestl

2004-01-01

353

Unusual Mitochondrial Genome Organization in Cytoplasmic Male Sterile Common Bean and the Nature of Cytoplasmic Reversion to Fertility  

PubMed Central

Spontaneous reversion to pollen fertility and fertility restoration by the nuclear gene Fr in cytoplasmic male sterile common bean (Phaseolus vulgaris L.) are associated with the loss of a large portion of the mitochondrial genome. To understand better the molecular events responsible for this DNA loss, we have constructed a physical map of the mitochondrial genome of a stable fertile revertant line, WPR-3, and the cytoplasmic male sterile line (CMS-Sprite) from which it was derived. This involved a cosmid clone walking strategy with comparative DNA gel blot hybridizations. Mapping data suggested that the simplest model for the structure of the CMS-Sprite genome consists of three autonomous chromosomes differing only in short, unique regions. The unique region contained on one of these chromosomes is the male sterility-associated 3-kb sequence designated pvs. Based on genomic environments surrounding repeated sequences, we predict that chromosomes can undergo intra- and intermolecular recombination. The mitochondrial genome of the revertant line appeared to contain only two of the three chromosomes; the region containing the pvs sequence was absent. Therefore, the process of spontaneous cytoplasmic reversion to fertility likely involves the disappearance of an entire mitochondrial chromosome. This model is supported by the fact that we detected no evidence of recombination, excision or deletion events within the revertant genome that could account for the loss of a large segment of mitochondrial DNA.

Janska, H.; Mackenzie, S. A.

1993-01-01

354

Cytoplasmic Male Sterility-Associated Chimeric Open Reading Frames Identified by Mitochondrial Genome Sequencing of Four Cajanus Genotypes  

PubMed Central

The hybrid pigeonpea (Cajanus cajan) breeding technology based on cytoplasmic male sterility (CMS) is currently unique among legumes and displays major potential for yield increase. CMS is defined as a condition in which a plant is unable to produce functional pollen grains. The novel chimeric open reading frames (ORFs) produced as a results of mitochondrial genome rearrangements are considered to be the main cause of CMS. To identify these CMS-related ORFs in pigeonpea, we sequenced the mitochondrial genomes of three C. cajan lines (the male-sterile line ICPA 2039, the maintainer line ICPB 2039, and the hybrid line ICPH 2433) and of the wild relative (Cajanus cajanifolius ICPW 29). A single, circular-mapping molecule of length 545.7 kb was assembled and annotated for the ICPA 2039 line. Sequence annotation predicted 51 genes, including 34 protein-coding and 17 RNA genes. Comparison of the mitochondrial genomes from different Cajanus genotypes identified 31 ORFs, which differ between lines within which CMS is present or absent. Among these chimeric ORFs, 13 were identified by comparison of the related male-sterile and maintainer lines. These ORFs display features that are known to trigger CMS in other plant species and to represent the most promising candidates for CMS-related mitochondrial rearrangements in pigeonpea.

Tuteja, Reetu; Saxena, Rachit K.; Davila, Jaime; Shah, Trushar; Chen, Wenbin; Xiao, Yong-Li; Fan, Guangyi; Saxena, K. B.; Alverson, Andrew J.; Spillane, Charles; Town, Christopher; Varshney, Rajeev K.

2013-01-01

355

Cytoplasmic male sterility-associated chimeric open reading frames identified by mitochondrial genome sequencing of four cajanus genotypes.  

PubMed

The hybrid pigeonpea (Cajanus cajan) breeding technology based on cytoplasmic male sterility (CMS) is currently unique among legumes and displays major potential for yield increase. CMS is defined as a condition in which a plant is unable to produce functional pollen grains. The novel chimeric open reading frames (ORFs) produced as a results of mitochondrial genome rearrangements are considered to be the main cause of CMS. To identify these CMS-related ORFs in pigeonpea, we sequenced the mitochondrial genomes of three C. cajan lines (the male-sterile line ICPA 2039, the maintainer line ICPB 2039, and the hybrid line ICPH 2433) and of the wild relative (Cajanus cajanifolius ICPW 29). A single, circular-mapping molecule of length 545.7 kb was assembled and annotated for the ICPA 2039 line. Sequence annotation predicted 51 genes, including 34 protein-coding and 17 RNA genes. Comparison of the mitochondrial genomes from different Cajanus genotypes identified 31 ORFs, which differ between lines within which CMS is present or absent. Among these chimeric ORFs, 13 were identified by comparison of the related male-sterile and maintainer lines. These ORFs display features that are known to trigger CMS in other plant species and to represent the most promising candidates for CMS-related mitochondrial rearrangements in pigeonpea. PMID:23792890

Tuteja, Reetu; Saxena, Rachit K; Davila, Jaime; Shah, Trushar; Chen, Wenbin; Xiao, Yong-Li; Fan, Guangyi; Saxena, K B; Alverson, Andrew J; Spillane, Charles; Town, Christopher; Varshney, Rajeev K

2013-06-20

356

Effects of Alternative Social Experience on the Sexual Function of Male Mice  

Microsoft Academic Search

The relevance of the social contact test “Wall” for evaluation of sexual motivation of male mice was tested and confirmed. Motivation of C57BL\\/6J male mice with alternative social experience (winners and victims in 10 and 20 daily male-male confrontations) was evaluated. Elevated primary sexual interest was detected in aggressive animals after 10 confrontations, while in submissive animals this interest was

A. V. Amikishieva; M. V. Ovsyukova

2003-01-01

357

Pre and post-mating sexual selection both favor large males in a rainbowfish  

Microsoft Academic Search

Sexual selection can act through female choice and male–male competition. Although both processes can act simultaneously,\\u000a they are typically studied independently. Here, we adopt a more integrated approach to studying sexual selection by incorporating\\u000a measures of both processes using the western rainbowfish Melanotaenia australis, a freshwater fish endemic to northwestern Australia. We assessed male–male competition and female choice separately while

Michael J. Young; Leigh W. Simmons; Jonathan P. Evans

2010-01-01

358

Sexual Health Among Male College Students in the United States and the Netherlands  

PubMed Central

Objectives To assess differences in sexual health behaviors, outcomes, and potential sociocultural determinants among male college students in the United States and the Netherlands. Methods Survey data were collected from random samples of students from both national cultures. Results American men were more likely to report inadequate contraception, HIV/STD infection, and unintended pregnancy than were Dutch men. Religiosity and sexuality education were able to explain national differences in these sexual health outcomes. Conclusions Findings suggest that sexuality education seems to decrease, rather than increase, sexual risk in heterosexually active male college students.

Dodge, Brian; Sandfort, Theo G. M.; Yarber, William L.; de Wit, John

2012-01-01

359

The Sexually Dimorphic Medial Preoptic Nucleus of Quail: A Key Brain Area Mediating Steroid Action on Male Sexual Behavior  

Microsoft Academic Search

About 10 years ago, a sexually differentiated nucleus was identified in the preoptic area (POA) of the Japanese quail in the course of studies analyzing the dimorphic mechanisms involved in the activation of sexual behavior. In this species, males exposed to testosterone copulate while females never show this masculine behavior. The present paper reviews anatomical, neurochemical, and functional data that

Gian Carlo Panzica; Carla Viglietti-Panzica; Jacques Balthazart

1996-01-01

360

Personal and Perceived Peer Attitudes Supporting Sexual Aggression as Predictors of Male College Students' Willingness to Intervene against Sexual Aggression  

ERIC Educational Resources Information Center

|Male college students (N = 395) completed anonymous surveys to report personal attitudes supporting sexual aggression and estimated the attitudes of their peers. Participants also indicated their willingness to intervene against a peer if they witnessed sexual aggression. Although both personal and peer attitudes were correlated with willingness…

Brown, Amy L.; Messman-Moore, Terri L.

2010-01-01

361

Personal and Perceived Peer Attitudes Supporting Sexual Aggression as Predictors of Male College Students' Willingness to Intervene against Sexual Aggression  

ERIC Educational Resources Information Center

Male college students (N = 395) completed anonymous surveys to report personal attitudes supporting sexual aggression and estimated the attitudes of their peers. Participants also indicated their willingness to intervene against a peer if they witnessed sexual aggression. Although both personal and peer attitudes were correlated with willingness…

Brown, Amy L.; Messman-Moore, Terri L.

2010-01-01

362

Adolescent Heterosexual Males Talk About the Role of Male Peer Groups in Their Sexual Decision-Making  

Microsoft Academic Search

This research draws on in-depth, one-on-one interviews with a racially and ethnically diverse sample of 17 adolescent males,\\u000a both virgins and non-virgins, to explore how they use talk to construct their sexual selves and present themselves as sexual\\u000a decision-makers. The emphasis here is how some of the boys (n = 8) drew upon a particular discourse in their self-productions and implicated male

Mark Cohan

2009-01-01

363

Isolation and analysis of differentially expressed genes in dominant genic male sterility (DGMS) Brassica napus L. using subtractive PCR and cDNA microarray  

Microsoft Academic Search

Dominant genic male sterility (DGMS) is an important approach to utilize the heterosis of Brassica napus, but the molecular mechanism of DGMS is not well understood. As an initial step towards understanding this event, some pilot studies were performed. Using suppression subtractive hybridization (SSH) and cDNA microarray, about 1200 significantly differentially expressed clones were isolated between the fertile and sterile

Jianyong Wu; Junru Shen; Xizeng Mao; Kede Liu; Liping Wei; Pingwu Liu; Guangsheng Yang

2007-01-01

364

Haldane's rule and the genetic basis of hybrid male sterility in {\\\\it Drosophila simulans}, {\\\\it Drosophila mauritiana\\\\\\/} and {\\\\it Drosophila sechellia\\\\\\/}  

Microsoft Academic Search

Genetic analysis of hybrid sterility and inviability has recently become a successful experimental approach to pursue the problem of speciation. In the present study, classical genetic analyses and high resolution two-dimensional gel electrophoresis (2DE) have been used to investigate the genetic basis of hybrid male sterility in three sibling species of the Drosophila melanogaster species subgroup. The genetic basis of

Ling-Wen Zeng

1994-01-01

365

The Genetic Basis of Haldane's Rule and the Nature of Asymmetric Hybrid Male Sterility Among Drosophila simulans, Drosophila mauritiana and Drosophila sechellia  

Microsoft Academic Search

Haldane's rule (i.e., the preferential hybrid sterility and inviability of heterogametic sex) has been known for 70 years, but its genetic basis, which is crucial to the understanding of the process of species formation, remains unclear. In the present study, we have investigated the genetic basis of hybrid male sterility using Drosophila simulans, Drosophila mauritiana and Drosophila sechellia. An introgression

Ling-Wen Zeng; Rama S. Singh

366

Rethinking sexual initiation: pathways to identity formation among gay and bisexual Mexican male youth.  

PubMed

The topic of same-sex sexual initiation has generally remained understudied in the literature on sexual identity formation among sexual minority youth. This article analyzes the narratives of same-sex sexual initiation provided by 76 gay and bisexual Mexican immigrant men who participated in interviews for the Trayectos Study, an ethnographic study of sexuality and HIV risk. These participants were raised in a variety of locations throughout Mexico, where they also realized their same-sex attraction and initiated their sexual lives with men. We argue that Mexican male same-sex sexuality is characterized by three distinct patterns of sexual initiation--one heavily-based on gender roles, one based on homosociality, and one based on object choice--which inform the men's interpretations regarding sexual roles, partner preferences, and sexual behaviors. We analyzed the social factors and forms of cultural/sexual socialization that lead sexual minority youth specifically to each of these three patterns of sexual initiation. Our findings confirm the importance of studying same-sex sexual initiation as a topic in its own right, particularly as a tool to gain a greater understanding of the diversity of same-sex sexual experiences and sexual identities within and among ethnic/cultural groups. PMID:20838869

Carrillo, Héctor; Fontdevila, Jorge

2010-09-14

367

Rethinking Sexual Initiation: Pathways to Identity Formation among Gay and Bisexual Mexican Male Youth  

PubMed Central

The topic of same-sex sexual initiation has generally remained understudied in the literature on sexual identity formation among sexual minority youth. This article analyzed the narratives of same-sex sexual initiation provided by 76 gay and bisexual Mexican immigrant men who participated in interviews for the Trayectos Study, an ethnographic study of sexuality and HIV risk. These participants were raised in a variety of locations throughout Mexico, where they also realized their same-sex attraction and initiated their sexual lives with men. We argue that Mexican male same-sex sexuality is characterized by three distinct patterns of sexual initiation-- one heavily-based on gender roles, one based on homosociality, and one based on object choice-- which inform the men’s interpretations regarding sexual roles, partner preferences, and sexual behaviors. We analyzed the social factors and forms of cultural/sexual socialization that lead sexual minority youth specifically to each of these three patterns of sexual initiation. Our findings confirm the importance of studying same-sex sexual initiation as a topic in its own right, particularly as a tool to gain a greater understanding of the diversity of same-sex sexual experiences and sexual identities within and among ethnic/cultural groups.

Carrillo, Hector; Fontdevila, Jorge

2010-01-01

368

Vulnerable Sexuality and HIV/AIDS Prevention Knowledge among Ethnic Tribal Male Youth in Bangladesh  

ERIC Educational Resources Information Center

|This study examines sexuality and HIV/AIDS prevention knowledge among minority ethnic male youth of Bangladesh. A cross-sectional survey was conducted through a self-administered questionnaire on 800 young males aged 15-24 years in the Chittagong Hill Tracts region in 2009. Of the respondents, almost one-third were sexually active and of them…

Kamal, S. M. Mostafa

2012-01-01

369

"Running a Train": Adolescent Boys' Accounts of Sexual Intercourse Involving Multiple Males and One Female  

ERIC Educational Resources Information Center

|The authors used qualitative research methods to explore the context and sexual risk behavior associated with sexual intercourse involving multiple males and one female, commonly called "running a train." Participants were 20 adolescent males aged 14 to 22 years who were either perpetrators of dating violence or perceived by teachers to be at…

Rothman, Emily F.; Decker, Michele R.; Reed, Elizabeth; Raj, Anita; Silverman, Jay G.; Miller, Elizabeth

2008-01-01

370

Factors Related to Childhood Sexual Abuse Among Gay\\/Bisexual Male Internet Escorts  

Microsoft Academic Search

This exploratory investigation examined the relationship between childhood sexual abuse (CSA) and related psychosocial characteristics and sexual behaviors among 46 gay\\/bisexual male escorts who advertise via the Internet. More than a quarter of men (28.3%) reported some history of CSA. Men reporting CSA were more likely to be from an ethnic minority group, identify as bisexual, have a primary male

Jeffrey T. Parsons; David S. Bimbi; Juline A. Koken; Perry N. Halkitis

2005-01-01

371

Female Condition Influences Preferences for Sexual Dimorphism in Faces of Male Humans (Homo sapiens )  

Microsoft Academic Search

In some species, female condition correlates positively with preferences for male secondary sexual traits. Women's preferences for sexually dimorphic characteristics in male faces (facial masculinity) have recently been reported to covary with self-reported attractiveness. As women's attractiveness has been proposed to signal reproductive condition, the findings in human (Homo sapiens) and other species may reflect similar processes. The current study

I. S. Penton-Voak; A. C. Little; B. C. Jones; D. M. Burt; B. P. Tiddeman; D. I. Perrett

2003-01-01

372

Vulnerable Sexuality and HIV/AIDS Prevention Knowledge among Ethnic Tribal Male Youth in Bangladesh  

ERIC Educational Resources Information Center

This study examines sexuality and HIV/AIDS prevention knowledge among minority ethnic male youth of Bangladesh. A cross-sectional survey was conducted through a self-administered questionnaire on 800 young males aged 15-24 years in the Chittagong Hill Tracts region in 2009. Of the respondents, almost one-third were sexually active and of them…

Kamal, S. M. Mostafa

2012-01-01

373

High sexual signalling rates of young individuals predict extended life span in male Mediterranean fruit flies  

Microsoft Academic Search

In a laboratory study, we monitored the lifetime sexual signalling (advertisement) of wild male Mediterranean fruit flies, and we tested the hypothesis that high lifetime intensity of sexual signalling indicates high survival probabilities. Almost all males exhibited signalling and individual signalling rates were highly variable from the beginning of the adults’ maturity and throughout their life span (average life span

Nikos T. Papadopoulos; Byron I. Katsoyannos; Nikos A. Kouloussis; James R. Carey; Hans-Georg Müller; Ying Zhang

2004-01-01

374

Reversed sexual size dimorphism in microtines: Are females larger than males or are males smaller than females?  

Microsoft Academic Search

Summary We analysed sexual size dimorphism for 21 populations of microtine rodents. Female to male size ratio varied considerably among populations from females significantly larger than males (ratio=1.18) to males larger than females (ratio=0.78). In a multiple regression analysis female to male home range size ratio explained 94% of the total variation in body size dimorphism and was the only

Søren Bondrup-Nielsen; Rolf Anker Ims

1990-01-01

375

Sexual Behavior in High-Functioning Male Adolescents and Young Adults with Autism Spectrum Disorder  

Microsoft Academic Search

Group home caregivers of 24 institutionalized, male, high-functioning adolescents and young adults with Autism Spectrum Disorder,\\u000a were interviewed with the Interview Sexuality Autism. Most subjects were reported to express sexual interest and to display\\u000a some kind of sexual behavior. Knowledge of socio-sexual skills existed, but practical use was moderate. Masturbation was common.\\u000a Many subjects were seeking physical contact with others.

Hans Hellemans; Kathy Colson; Christine Verbraeken; Robert Vermeiren; Dirk Deboutte

2007-01-01

376

Stimulating property of Turnera diffusa and Pfaffia paniculata extracts on the sexual behavior of male rats  

Microsoft Academic Search

Sexually potent and sexually sluggish\\/impotent male rats were treated orally with different amounts of Turnera diffusa and Pfaffia paniculata fluid extracts (0.25, 0.50, 1.0?ml\\/kg). While having no effect on the copulatory behavior of sexually potent rats, both plant\\u000a extracts – singly or in combination – improved the copulatory performance of sexually sluggish\\/impotent rats. The highest\\u000a dose of either extract (1?ml\\/kg)

R. Arletti; A. Benelli; E. Cavazzuti; G. Scarpetta; A. Bertolini

1999-01-01

377

Sexual behavior and AIDS knowledge of young male prostitutes in Manhattan  

Microsoft Academic Search

Despite their presumed high risk for AIDS, there are almost no sexual behavior data available which are sufficient for the development and assessment of intervention programs for male prostitutes. This study was designed to obtain such data. Fifty 14–27?year?old male prostitutes in Manhattan were interviewed using structured instruments to assess sexual orientation, sexual behavior, knowledge of AIDS, and substance abuse.

Richard R. Pleak

1990-01-01

378

Sexual-discrimination learning in male Japanese quail (Coturnix coturnix japonica).  

PubMed

We investigated how male Japanese quail (Coturnix coturnix japonica) learn through extensive social and sexual experience to discriminate between male and female conspecifics. Opportunity for heterosexual copulation was important for this learning, but even extensive copulatory opportunity was not sufficient to produce a sexual discrimination; subjects also required exposure to other males. Exposure to females after copulatory opportunity did not produce a sexual discrimination but facilitated its acquisition. Time or exposure to only the visual features of male birds (provided by taxidermic models) after copulatory opportunity did not result in differential responding to male and female conspecifics. Finally, presenting stimulus birds one at a time proved to be a more sensitive test of sexual-discrimination learning than presenting two stimulus birds at the same time. The results indicate that sexual-discrimination learning is similar to conventional associative learning. PMID:2598621

Nash, S; Domjan, M; Askins, M

1989-12-01

379

What use are male hosts? The dynamics of maternally inherited bacteria showing sexual transmission or male killing.  

PubMed

Closely related pathogens and parasites often have distinctly different strategies for transmission. In some cases, presence of one potential mode of transmission reduces the rate of or forbids another. In these cases, one can ask what the conditions are that favor the use of one mode of transmission over the other. We constructed a mathematical model to examine this issue for the case of maternally inherited endosymbionts of insects. Here, killing males (to enhance transmission through the female line by reducing sibling competition) and retaining live males as a vehicle for sexual transmission are mutually exclusive strategies. Our model indicates that sexual transmission of a maternally inherited parasite can exclude a male-killing strain, provided that a sexually transmitted infection can take over an infection by a male-killing strain either following exposure or when male killing is incomplete and sexual transmission is efficient. The presence of sexual transmission may also explain why secondary symbionts do not degrade toward the evolution of male killing but remain as "beneficial partners" to both male and female hosts. This stabilization may be fundamental to the evolution toward obligate mutualism, and thus it is important in the ecology and evolution of many arthropod groups. PMID:19272014

Engelstädter, Jan; Hurst, Gregory D D

2009-05-01

380

Sexually transmitted infections among male highway coach drivers in Myanmar.  

PubMed

A cross sectional descriptive study was conducted from February 2008 to December 2009 at the largest Highway Terminal, Yangon, Myanmar to determine the prevalence of curable STIs (syphilis, gonorrhea, chlamydial infections, and trichomoniasis), to find out the associated factors for STIs, and to determine the antibiotic susceptibility pattern of gonococcal infection among highway drivers. Urine and blood specimens were collected from 601 male highway coach drivers after an interview about their behavior. Standard laboratory tests were carried out to detect STIs. Multivariate analysis was used to ascertain potential risk factors for STIs. The prevalence rates of syphilis, gonorrhea, chlamydial infections, and trichomoniasis were 4.8, 4.3, 5.7, and 9.8%, respectively. One hundred and two (17.0%) were infected with at least one of the tested four STIs, and 34 (5.7%) had STI co-infections (2STIs). Those who had multiple sexual contacts were likely to be infected with at least one STI, and those who had a history of inconsistent condom use within past two weeks and multiple sexual contacts were more likely to have STI co-infections (p < 0.05). Antimicrobial susceptibility of 21 Neisseria gonorrhoeae isolates showed that 85.7% were susceptible to azithromycin, 80.9% to spectinomycin, 66.7% to cefixime, 61.9% to ceftriaxone, and 38.1% to ciprofloxacin. The high prevalence of STIs in this study and the decreased susceptibility of Neisseria gonorrhoeae to cephalosporin and fluoroquinolone highlighted the role of periodic screening in early diagnosis and effective treatment of STIs among high-risk populations. PMID:24050075

Aung, Wah Wah; Thant, Myo; Wai, Khin Thet; Aye, Mya Mya; Ei, Phyu Win; Myint, Thuzar; Thidar, Moe

2013-05-01

381

Sexual health knowledge, sexual relationships and condom use among male trekking guides in Nepal: a qualitative study.  

PubMed

People in Nepal generally hold fairly traditional views about sex and sexual health, whilst Western tourists often have a more liberal approach towards sex and relationships. There is evidence that significant sexual interaction occurs between male trekking guides and female travellers and/or local female sex workers in Nepal. This qualitative study explored trekking guides' sexual health knowledge, sexual relationships and condom use with female trekkers and local female sex workers. A total of 21 in-depth interviews were conducted with male trekking guides. Most reported having had sexual relationships with female trekkers and local female sex workers. Explanations for intercourse with female trekkers included: financial support; getting future trekkers through word-of-mouth advertising from the women they have had sex with; and opportunities for emigration. Interestingly, sexual intercourse is reported as more likely to be initiated by female trekkers than by guides, and more so by older women. In contrast, the main reasons for having sex with local female sex workers included: romantic love or sexual excitement and novelty. Awareness regarding sexual health was high among guides, but several factors discouraged the regular use of condoms. Further research with female tourists would help understand the motivations and reasons for their sexual behaviour. PMID:19813118

Simkhada, Padam; van Teijlingen, Edwin R; Regmi, Pramod R; Bhatta, Prakash

2010-01-01

382

Global analysis of gene expression in flower buds of Ms-cd1 Brassica oleracea conferring male sterility by using an Arabidopsis microarray  

Microsoft Academic Search

The dominant male sterility gene Ms-cd1 is identified in Brassica oleracea. Electron microscopical observations revealed that abortion of pollen development starts after tetrad formation. This important\\u000a male sterility phenotype is characterized by lack of degradation of the primary pollen mother cell (PMC) wall and delayed\\u000a degradation of callose surrounding the tetrads and thus arrest of microspore release. Gene expression of

Jungen Kang; Guoyu Zhang; Guusje Bonnema; Zhiyuan Fang; Xiaowu Wang

2008-01-01

383

Synthesis of Ogura male sterile rapeseed ( Brassica napus L.) with cold tolerance by protoplast fusion and effects of atrazine resistance on seed yield  

Microsoft Academic Search

Twenty-one cold-tolerant, male sterile Brassica napus somatic hybrids were produced by protoplast fusion. The fusion partners were a coldsensitive, Ogura cytoplasmic male sterile cauliflower inbred (B. oleracea var. botrytis inbred NY7642A) and a cold-tolerant, fertile canola-type B. rapa cv. Candle. Hybridity was confirmed by morphology, isozyme expression, flow cytometry, and DNA hybridization. Organellar analyses revealed a very strong bias for

Douglas W. Heath; Elizabeth D. Earle

1996-01-01

384

Personal and perceived peer attitudes supporting sexual aggression as predictors of male college students' willingness to intervene against sexual aggression.  

PubMed

Male college students ( N = 395) completed anonymous surveys to report personal attitudes supporting sexual aggression and estimated the attitudes of their peers. Participants also indicated their willingness to intervene against a peer if they witnessed sexual aggression. Although both personal and peer attitudes were correlated with willingness to intervene, in regression analyses only perceived peer attitudes emerged as a significant predictor of willingness to intervene. Results suggest that personal attitudes supporting sexual aggression are not as relevant to men's willingness to intervene against sexual aggression as are perceived peer norms regarding sexual aggression. Findings are relevant to sexual assault prevention education with men, suggesting that attempts to encourage bystander intervention may be best presented in the context of challenging perceived norms. PMID:19401602

Brown, Amy L; Messman-Moore, Terri L

2009-04-28

385

Sexual Harassment and Health Among Male and Female Police Officers  

Microsoft Academic Search

The aims of this study were to investigate whether sexual harassment is related to mental and physical health of both men and women, and to explore the possible moderating effects of gender on the relation between sexual harassment and health. In addition, we investigated whether women were more often bothered by sexual harassment than men, and whether victims who report

Stans de Haas; Greetje Timmerman; Mechtild Höing

2009-01-01

386

Premarital Sexual Behavior among male college students of Kathmandu, Nepal  

Microsoft Academic Search

BACKGROUND: In Nepal, as in other Asian countries, the issue of sexuality still remains a taboo. Despite this fact, an increasing number of sexual activities is being reported by Nepalese students. This trend warrants serious and timely attention. Due to the sensitivity of the topic of premarital sexuality, youth receive inadequate education, guidance and services on reproductive health. The main

Ramesh Adhikari; Jyotsna Tamang

2009-01-01

387

Sexual Behavior among Employed Male Rural Migrants in Shanghai, China  

ERIC Educational Resources Information Center

|A study of sexual behavior in migrant men was conducted in construction sites, markets, and factories in Shanghai, the largest city in China. An anonymous, self-administered questionnaire was completed by the migrants. Among 986 sexually active men, 14% had had more than one sexual partner in their lifetime, 31% premarital sex, 3.3% oral sex, and…

He, Na; Detels, Roger; Chen, Zheng; Jiang, Qingwu; Zhu, Jinde; Dai, Yiqun; Wu, Min; Zhong, Xing; Fu, Chaowei; Gui, Dexin

2006-01-01

388

Measurement of benign prostatic hyperplasia treatment effects on male sexual function  

PubMed Central

Benign prostatic hyperplasia (BPH) is the leading cause of lower urinary tract symptoms among the aging male population. Epidemiological, pathophysiological and clinical studies indicate that many of these men also suffer from declining sexual function, especially those undergoing treatment for their BPH-related urinary symptoms. Although urinary symptoms and quality of life may improve with BPH therapy, the resulting effects on sexual function vary by medical, surgical and minimally invasive approaches and have not been consistently reported. As comprehensive, validated instruments to measure male sexual function are now available for routine use in the clinical setting, urologists and primary care providers caring for patients with BPH have the opportunity to monitor both urinary and sexual function before, during and after BPH therapy. Herein, we describe the relationship between BPH and its treatments on male sexual function, the role of new measures for sexual functioning and opportunities for future work to improve the care of men suffering from both maladies.

Skolarus, TA; Wei, JT

2010-01-01

389

Sexual selection in a moth: effect of symmetry on male mating success in the wild  

Microsoft Academic Search

Sexual selection is generally caused by female choice and male--male competition. In female choice process, female preference is favored indirectly and\\/or directly by sexual selection. In indirect selection, females expressing the preference might gain indirect genetic benefits. In direct selection, females expressing the preference might gain direct benefits or avoid male-imposed costs. The white-tailed zygaenid moth Elcysma westwoodii is monandrous,

Chiharu Koshio; Makoto Muraji; Haruki Tatsuta; Shin-ichi Kudo

2007-01-01

390

Personal Characteristics, Sexual Behaviors, and Male Sex Work: A Quantitative Approach  

Microsoft Academic Search

Male sex workers serve multiple groups (i.e., gay-identified men, heterosexually-identified men, and their own sexual partners), making them a unique source to test theories of gender, masculinity, and sexuality. To date, most scholarship on this topic has been qualitative. I assembled a dataset from the largest online male sex worker website to conduct the first quantitative analysis of male escorts

Trevon D. Logan

2010-01-01

391

Effect of aqueous extract of Arctium lappa L. (burdock) roots on the sexual behavior of male rats  

PubMed Central

Background Arctium lappa L. root has traditionally been recommended as an aphrodisiac agent. It is used to treat impotence and sterility in China, and Native Americans included the root in herbal preparations for women in labor. However, its use has not been scientifically validated. The present study therefore investigated the effects of aqueous extract of Arctium lappa L. roots on sexual behavior in normal male rats. Methods Seventy-five albino male rats were randomly divided into five groups of 15 rats each. Rats in group 1 (control) were administered 10 mL?kg body weight distilled water (vehicle), group 2 received 60 mg/kg body weight sildenafil citrate (Viagra), while those in groups 3, 4, and 5 were given 300, 600, and 1,200 mg/kg body weight, respectively, of aqueous extract of Arctium lappa L. roots in the same volume. Female albino rats were made receptive by hormonal treatment. Sexual behavior parameters in male rats were monitored on days 3, 7 and 15 by pairing with receptive females (1:3). Male serum testosterone concentrations and potency were also determined. Results Oral administration of Arctium lappa L. roots extract at 600 and 1,200 mg/kg body weight significantly increased the frequencies of mount, intromission, and ejaculation frequency (p < 0.05). The latencies of mount and intromission were significantly reduced and ejaculation latency was prolonged. Administration of the extract also reduced the post-ejaculatory interval. The standard drug (Viagra) was more effective than the extract. The extract significantly increased the frequencies of all components of penile reflexes as well as serum testosterone levels, compared with the distilled water controls. Conclusions The results of this study demonstrate that aqueous extract of Arctium lappa L. roots enhances sexual behavior in male rats. The aphrodisiac effects of the plant extract may be related to the presence of flavonoids, saponins, lignans and alkaloids, acting via a multitude of central and peripheral mechanisms. These results thus support the traditional use of Arctium lappa L. root extract for treating impotence and sterility.

2012-01-01

392

Influence of methoprene and protein on survival, maturation and sexual performance of male Ceratitis capitata (Diptera:Tephritidae)  

Technology Transfer Automated Retrieval System (TEKTRAN)

The Mediterranean fruit fly (medfly), Ceratitis capitata (Wied.), like many other polifagous tephritids (Diptera: Tephritidae), adopts a lek as mating system. The sterile insect technique (SIT) requires the release of sterile males able to survive on the field, to compete with wild males, and attrac...

393

Sexual behavior in high-functioning male adolescents and young adults with autism spectrum disorder.  

PubMed

Group home caregivers of 24 institutionalized, male, high-functioning adolescents and young adults with Autism Spectrum Disorder, were interviewed with the Interview Sexuality Autism. Most subjects were reported to express sexual interest and to display some kind of sexual behavior. Knowledge of socio-sexual skills existed, but practical use was moderate. Masturbation was common. Many subjects were seeking physical contact with others. Half of the sample had experienced a relationship, while three were reported to have had sexual intercourse. The number of bisexual orientations appeared high. Ritual-sexual use of objects and sensory fascination with a sexual connotation were sometimes present. A paraphilia was present in two subjects. About one third of the group needed intervention regarding sexual development or behavior. PMID:16868848

Hellemans, Hans; Colson, Kathy; Verbraeken, Christine; Vermeiren, Robert; Deboutte, Dirk

2007-02-01

394

The Earliest Case of Extreme Sexual Display with Exaggerated Male Organs by Two Middle Jurassic Mecopterans  

PubMed Central

Background Many extant male animals exhibit exaggerated body parts for display, defense or offence in sexual selection, such as male birds of paradise showing off colorful and elegant feathers and male moose and reindeers bearing large structured antlers. For insects, male rhinoceros and stag beetles have huge horn-like structure for fighting and competition and some male Leptopanorpa scorpionflies have very long abdominal terminal segments for sexual display and competition. Fossil records of insects having exaggerated body parts for sexual display are fairly rare. One example is two male holcorpids with elongate abdominal segments from sixth (A6) to eighth (A8) and enlarged male genitalia from Eocene, suggesting evolution of these characters occurred fairly late. Principal Findings We document two mecopterans with exaggerated male body parts from the late Middle Jurassic Jiulongshan Formation in northeastern China. Both have extremely extended abdominal segments from A6 to A8 and enlarged genitalia, which might have been used for sexual display and, to less extent, for fighting with other males in the competition for mates. Although Fortiholcorpa paradoxa gen. et sp. nov. and Miriholcorpa forcipata gen. et sp. nov. seem to have affinities with Holcorpidae, we deem both as Family Incertae sedis mainly due to significant differences in branching pattern of Media (M) veins and relative length of A8 for F. paradoxa, and indiscernible preservation of 5-branched M veins in hind wing for M. forcipata. Conclusions/Significance These two new taxa have extended the records of exaggerated male body parts of mecopterans for sexual display and/or selection from the Early Eocene to the late Middle Jurassic. The similar character present in some Leptopanorpa of Panorpidae suggests that the sexual display and/or sexual selection due to extremely elongated male abdominal and sexual organs outweigh the negative impact of bulky body and poor mobility in the evolutionary process.

Wang, Qi; Shih, Chungkun; Ren, Dong

2013-01-01

395

Identification and inheritance of male sterility in groundnut (Arachis hypogaea L.)  

Microsoft Academic Search

Some plants without pods but with gynophores were observed in two F4 progenies of two crosses of goundnut (Arachis hypogaea L.). The flowers on these plants had translucent white anthers with no or a few sterile pollen grains. Three such plants in the succeeding generation were hand pollinated with pollen from a short-duration Indian cv. JL 24. The resulting F1

Hari D. Upadhyaya; Shyam N. Nigam

1996-01-01

396

Sexual selection for male dominance reduces opportunities for female mate choice in the European bitterling (Rhodeus sericeus)  

Microsoft Academic Search

Sexual selection involves two main mechanisms: intrasexual competition for mates and intersexual mate choice. We experimentally separated intrasexual (male-male interference competition) and intersexual (female choice) components of sexual selection in a freshwater fish, the European bitterling ( Rhodeus sericeus ). We compared the roles of multiple morphological and behavioural traits in male success in both components of sexual com- petition,

M. REICHARD; J. BRYJA; M. ONDRACKOVA; M. DAVIDOVA; P. KANIEWSKA; C. SMITH

2005-01-01

397

‘Most of Us Guys are Raring to Go Anytime, Anyplace, Anywhere’: Male and Female Sexuality in Cleo and Cosmo  

Microsoft Academic Search

Women’s magazines are a popular site for analysis of socio-cultural messages about gender, sex, and sexuality. We analyzed six consecutive issues of Cosmopolitan and Cleo to identify the ways in which they construct and represent male and female sexuality. Overall, male sexuality was prioritised, ‘real’ heterosex was depicted as penetrative, and orgasm was given precedence. Two main accounts of male

Panteá Farvid; Virginia Braun

2006-01-01

398

Core Sexual/Reproductive Health Care to Deliver to Male Adolescents: Perceptions of Clinicians Focused on Male Health  

PubMed Central

Purpose Male adolescents experience adverse sexual/reproductive health (SRH) outcomes, yet few providers deliver male SRH care. Given the lack of evidence base for male SRH care, the purpose of this study was to examine perceived importance in delivering SRH care to male adolescents among clinicians focused on male health. Methods Seventeen primary care clinicians focused on male health, representing pediatricians, family physicians, internists, and nurse practitioners, were individually queried about male adolescents’ SRH needs and perceived importance to screen/assess for 13 male SRH services using a case-scenario approach varying by visit type and allotted time. Results Participants were highly consistent in identifying a scope of 10 SRH services to deliver to male adolescents during a longer annual visit and a core set of 6 SRH services during a shorter annual visit including 1) counseling on sexually transmitted infection/human immunodeficiency (STI/HIV) risk reduction including testing/treatment; and assessing for 2) pubertal growth/development; 3) substance abuse/mental health; 4) non-STI/HIV genital abnormalities; 5) physical/sexual abuse; and 6) male pregnancy prevention methods. Participants did not agree whether SRH care should be delivered during non-annual acute visits. Conclusions Despite lack of data for male SRH care, clinicians focused on male health strongly agreed upon male SRH care to deliver during annual visits that varied by visit type and allotted time. Study findings provide a foundation for much needed clinical guidelines for male adolescents’ SRH care and have implications for education and training health professionals at all levels and the organization and delivery of male SRH services.

Marcell, Arik V.; Ellen, Jonathan M.

2011-01-01

399

Sexually Coercive Behavior in Male Youth: Population Survey of General and Specific Risk Factors  

Microsoft Academic Search

Little is known about risk\\/protective factors for sexually coercive behavior in general population youth. We used a Swedish\\u000a school-based population survey of sexual attitudes and experiences (response rate 77%) and investigated literature-based variables\\u000a across sexually coercive (SEX), non-sexual conduct problem (CP), and normal control (NC) participants to identify general\\u000a and specific risk\\/protective factors for sexual coercion. Among 1,933 male youth,

Cecilia Kjellgren; Gisela Priebe; Carl Göran Svedin; Niklas Långström

2010-01-01

400

Sexually coercive behavior in male youth: population survey of general and specific risk factors.  

PubMed

Little is known about risk/protective factors for sexually coercive behavior in general population youth. We used a Swedish school-based population survey of sexual attitudes and experiences (response rate 77%) and investigated literature-based variables across sexually coercive (SEX), non-sexual conduct problem (CP), and normal control (NC) participants to identify general and specific risk/protective factors for sexual coercion. Among 1,933 male youth, 101 (5.2%) reported sexual coercion (ever talked or forced somebody into genital, oral, or anal sex) (SEX), 132 (6.8%) were classified as CP, and the remaining 1,700 (87.9%) as NC. Of 29 tested variables, 25 were more common in both SEX and CP compared to NC youth, including minority ethnicity, separated parents, vocational study program, risk-taking, aggressiveness, depressive symptoms, substance abuse, sexual victimization, extensive sexual experiences, and sexual preoccupation. When compared to CP youth only, SEX youth more often followed academic study programs, used less drugs and were less risk-taking. Further, SEX more frequently than CP youth reported gender stereotypic and pro-rape attitudes, sexual preoccupation, prostitution, and friends using violent porn. Finally, in a multivariate logistic regression, academic study program, pro-rape attitudes, sexual preoccupation, and less risk-taking independently remained more strongly associated with SEX compared to CP offending. In conclusion, several sociodemographic, family, and individual risk/protective factors were common to non-sexual and sexually coercive antisocial behavior in late adolescence. However, pro-rape cognitions, and sexual preoccupation, were sexuality-related, specific risk factors. The findings could inform preventive efforts and the assessment and treatment of sexually coercive male youth. PMID:19888644

Kjellgren, Cecilia; Priebe, Gisela; Svedin, Carl Göran; Långström, Niklas

2009-11-04

401

Male quality, signal reliability and female choice: assessing the expectations of inter-sexual selection.  

PubMed

Numerous models have attempted to explain the evolution of extravagant male ornaments found in many species. Inter-sexual indicator models postulate that male ornaments evolved as signals of quality, and that females use these signals to select the highest quality males. These models involve three traits--male quality, male signals and female preferences--and have specific expectations about the relative strengths of the phenotypic relationships between these traits. Using data from anuran species, we assessed the relative strengths of the phenotypic relationships using meta-analysis. The relative strengths of these phenotypic correlations were as expected by indicator models, providing support for indicator models of inter-sexual selection. We also found much variation in our data, suggesting that additional, untested factors may mediate inter-sexual interactions in this taxon, such as differences in the importance of quality signalling between species. These factors require investigation, in order to improve our understanding of inter-sexual selection. PMID:22591267

McLean, M J; Bishop, P J; Nakagawa, S

2012-05-16

402

Organization of actin cytoskeleton during meiosis I in a wheat thermo-sensitive genic male sterile line.  

PubMed

BS366 is a thermo-sensitive male sterile line of wheat (Triticum aestivum L.) for two-line hybrid breeding, which exhibits aberrant meiotic cytokinesis under low temperature. Through transcriptome analysis, a possible regulatory role for plant actin cytoskeleton was suggested. However, the organization of actin cytoskeleton in meiosis has been poorly understood so far. Here, fixed microsporocytes during meiosis were labeled with tetramethylrhodamine isothiocyanate-phalloidin and 4',6-diamidino-2-phenylindole. Quantities of fluorescent micrographs were captured using a confocal microscope, including the transient state from metaphase to telophase. We observed that actin filaments were abundant in typical kariokinetic spindle, central spindle (parallel microtubules or actin fibers between two separated chromosomes in anaphase), and phragmoplast. Interestingly, we identified the Chinese lantern-shaped actin phragmoplast in wheat meiosis for the first time. Under low temperature, phragmoplast actin filaments were chaotic and normal cell plate failed to form. These data provide new insights into the organization of actin filaments during male meiosis of plant and support a role of actin cytoskeleton in bringing about thermo-sensitive male sterility in wheat. PMID:22350736

Xu, Chenguang; Liu, Zetao; Zhang, Liping; Zhao, Changping; Yuan, Shaohua; Zhang, Fengting

2012-02-16

403

Sexual Function in Women from Infertile Couples and in Women Seeking Surgical Sterilization  

Microsoft Academic Search

The purpose of this study was to compare sexual function between women of infertile couples (AR) and women seeking tubal ligation (TL). Women who attended Setor de Infertilidade do Serviço de Ginecologia e Obstetrícia do Hospital de Clinicas de Porto Alegre (HCPA) or the Serviço de Orientação e Planejamento Familiar (SERPLAN) completed the Female Sexual Function Index, a questionnaire about

Heitor Hentschel; Daniele Lima Alberton; Robert John Sawdy; Edison Capp; José Roberto Goldim; Eduardo Pandolfi Passos

2008-01-01

404

A change in competitive context reverses sexual selection on male size  

Microsoft Academic Search

In studies of sexual selection, larger size is often argued to increase male fitness, and relatively smaller males are explained by genetic and ?or environmental variation. We demonstrate that a size-development life-history trade-off could underlie the maintenance of a broad, unimodal distribution of size in male redback spiders (Latrodectus hasselti). Larger males are superior in direct competition, but redback males

M. M. K ASUMOVIC; M. C. B. A NDRADE

2008-01-01

405

Part II: Differences between Sexually Victimized and Nonsexually Victimized Male Adolescent Sexual Abusers and Delinquent Youth--Further Group Comparisons of Developmental Antecedents and Behavioral Challenges  

ERIC Educational Resources Information Center

|In a recent paper published in the "Journal of Child Sexual Abuse," we assessed the differences between sexually victimized and nonsexually victimized male adolescent sexual abusers (Burton, Duty, & Leibowitz, 2011). We found that the sexually victimized group had more severe developmental antecedents (e.g., trauma and early exposure to…

Leibowitz, George S.; Burton, David L.; Howard, Alan

2012-01-01

406

Part II: Differences between Sexually Victimized and Nonsexually Victimized Male Adolescent Sexual Abusers and Delinquent Youth--Further Group Comparisons of Developmental Antecedents and Behavioral Challenges  

ERIC Educational Resources Information Center

In a recent paper published in the "Journal of Child Sexual Abuse," we assessed the differences between sexually victimized and nonsexually victimized male adolescent sexual abusers (Burton, Duty, & Leibowitz, 2011). We found that the sexually victimized group had more severe developmental antecedents (e.g., trauma and early exposure to…

Leibowitz, George S.; Burton, David L.; Howard, Alan

2012-01-01

407

Self-awareness of the male sexual response after spinal cord injury.  

PubMed

The aim of this study was to assess the impact of spinal cord injury on men's sexual motivation, through the sexual desire self-assessment, and the sexual arousal and orgasm physiological responses. This research consisted of a descriptive, nonprobabilistic and comparative study, designed to outline the target population characteristics to compare the studied variables. Forty spinal cord injured male patients and a control group composed of 50 able-bodied male individuals filled in a questionnaire that assessed sexual behaviour, functioning and satisfaction. Comparing the control group with the injured group in the postinjury period, there was no significant difference in the sexual desire; however, in relation to sexual arousal and the orgasm intensity, there was a significant difference. The same results were found when comparing the injured participants' preinjury and postinjury period reports. It was clear that the injury significantly reduced sexual arousal among quadriplegic participants and orgasm intensity among both quadriplegic and paraplegic men. The spinal cord injury had a significant impact on sexual arousal and orgasm physiological response, although the sexual desire perception was not significantly altered, indicating that spinal cord injury affects these men's sexual behaviour in terms of sexual performance and body sensitivity. PMID:19011580

Cardoso, Fernando Luiz; Savall, Ana Carolina R; Mendes, Aline K

2009-12-01

408

Sexual motivation is demasculinized, but not feminized, in prenatally stressed male rats  

Microsoft Academic Search

Sexual motivation and copulation in male rats are associated with dopamine release in the nucleus accumbens. Demasculinized copulatory behavior has been demonstrated in prenatally stressed adult male rats. We have previously reported that approximately 80% of prenatally stressed male rats do not exhibit copulation and that no significant changes in nucleus accumbens dopamine release are seen during exposure to estrous

C.-T. Wang; H.-A. Shui; R.-L. Huang; M.-Y. Tai; M.-T. Peng; Y.-F. Tsai

2006-01-01

409

Sexual Harassment by Males Reduces Female Fecundity in the Alfalfa Leafcutting Bee (Megachile rotundata)  

Technology Transfer Automated Retrieval System (TEKTRAN)

Under sexual conflict, males evolve traits to increase their mating and reproductive success that impose costs on females. Females evolve counter-adaptations to resist males and reduce those costs. Female resistance may instead serve as a mechanism for mate choice if the male-imposed costs are outwe...

410

Article The Sensory Circuitry for Sexual Attraction in C. elegans Males  

Microsoft Academic Search

Summary Background: Why do males and females behave differ- ently? Sexually dimorphic behaviors could arise from sex-specific neurons or by the modification of circuits present in both sexes. C. elegans males exhibit different behaviors than hermaphrodites. Although there is a sin- gle class of sex-specific sensory neurons in the head of males, most of their neurons are part of a

Jamie Q. White; Thomas J. Nicholas; Jeff Gritton; Long Truong; Eliott R. Davidson; Erik M. Jorgensen

411

Sexual abuse in Canadian university and college dating relationships: The contribution of male peer support  

Microsoft Academic Search

Using data from a Canadian national representative sample survey of male university and college students, this study tested three hypotheses from a theoretical model which attempts to explain the relationship between male peer group dynamics and sexual assault in dating relationships. Consistent with previous research conducted in the United States, the findings reported here show that male peer support is

Walter S. De Keseredy; Katharine Kelly

1995-01-01

412

The Effect of Amantadine on Clomipramine Induced Sexual Dysfunction in Male Rats  

PubMed Central

Objective Several studies have reported that Clomipramine has the ability to suppress male rat sexual behavior. Literature indicates that the activation of brain D2 receptors causes facilitation of penile erection, and a number of reports have indicated dopamine’s involvement in sexual function. Hence this study was undertaken to investigate the effect of Amantadine, a dopamine agonists on the Clomipramine induced sexual dysfunction. Methods The study subjects involved a total of 48 males and 48 females, 4 months old Sprague-Dawley albino rats, all housed in a group of six males and females separately in plexi glass cages in an acclimatized colony room (25±0.50C) maintained on a 12/12 hr light/dark cycle. The male rats were randomly divided into four groups of 12 male rats each. Group I served as controls. Group II, III, and IV were treated with Amantadine (9 mg/kg body weight, p.o) 30 min, prior to the treatment with 13.5 mg/kg, 27 mg/Kg and 54 mg/Kg bodyweight p.o of Clomipramine respectively for 60 days. The control group received vehicle 1 ml / kg p.o. The sexual behavior of the male rats was observed to determine the following parameters: mount latency, intromission latency, ejaculation latency, post ejaculatory pause, and intromission frequency. As well as the sexual behavior; serum testosterone and histopathology of the testes were also investigated in this study. Results The results indicate that Amantadine in all aspects failed to antagonize Clomipramine induced sexual dysfunction in male rats. Even the sexual competence of male rats treated with ½ therapeutic dose (TD) of Clomipramine failed to regain their sexual competence in the presence of Amantadine. Testicular damage and decline in testosterone levels continued in the presence of Amantadine. Conclusion Overall, the results suggest that Amantadine could not be a safe antidote to antagonize Clomipramine induced sexual dysfunction.

Devaangam, Sheshadri Shekar; Kumar, Ashok

2011-01-01

413

Sexual activity increases the number of newborn cells in the accessory olfactory bulb of male rats.  

PubMed

In rodents, sexual behavior depends on the adequate detection of sexually relevant stimuli. The olfactory bulb (OB) is a region of the adult mammalian brain undergoing constant cell renewal by continuous integration of new granular and periglomerular neurons in the accessory (AOB) and main (MOB) olfactory bulbs. The proliferation, migration, survival, maturation, and integration of these new cells to the OB depend on the stimulus that the subjects received. We have previously shown that 15 days after females control (paced) the sexual interaction an increase in the number of cells is observed in the AOB. No changes are observed in the number of cells when females are not allowed to control the sexual interaction. In the present study we investigated if in male rats sexual behavior increases the number of new cells in the OB. Male rats were divided in five groups: (1) males that did not receive any sexual stimulation, (2) males that were exposed to female odors, (3) males that mated for 1 h and could not pace their sexual interaction, (4) males that paced their sexual interaction and ejaculated one time and (5) males that paced their sexual interaction and ejaculated three times. All males received three injections of the DNA synthesis marker bromodeoxyuridine at 1h intervals, starting 1 h before the beginning of the behavioral test. Fifteen days later, males were sacrificed and the brains were processed to identify new cells and to evaluate if they differentiated into neurons. The number of newborn cells increased in the granular cell layer (GrCL; also known as the internal cell layer) of the AOB in males that ejaculated one or three times controlling (paced) the rate of the sexual interaction. Some of these new cells were identified as neurons. In contrast, no significant differences were found in the mitral cell layer (also known as the external cell layer) and glomerular cell layer (GlCL) of the AOB. In addition, no significant differences were found between groups in the MOB in any of the layers analyzed. Our results indicate that sexual behavior in male rats increases neurogenesis in the GrCL of the AOB when they control the rate of the sexual interaction. PMID:22783170

Portillo, Wendy; Unda, Nancy; Camacho, Francisco J; Sánchez, María; Corona, Rebeca; Arzate, Dulce Ma; Díaz, Néstor F; Paredes, Raúl G

2012-07-06

414

Exposure to odors of rivals enhances sexual motivation in male giant pandas.  

PubMed

Males will alter their mating behavior to cope with the presence of their competitors. Even exposure to odors from potential competitors can greatly increase male ejaculate expenditure in a variety of animals including insects, fishes, birds and rodents. Major efforts have been made to examine males' plastic responses to sperm competition and its fitness benefits. However, the effects of competitor absence on male's sexual motivation and behaviors remain unclear, which has been proposed to be one of the causes for the poor sexual performance of some captive mammals. This study revealed that sexual motivation can be greatly enhanced in captive male giant pandas (Ailuropoda melanoleuca) by exposure to chemosensory cues from either one or three conspecifics males. It had been shown that potential rivals' odors increased males' chemosensory investigation behavior, as well as their observing, following and sniffing behaviors towards estrous females. Behaviors changed regardless of the number of rivals (one or three). Our results demonstrate the effects of potential competition on male giant pandas' sexual motivation and behavioral coping strategy. We anticipate that our research will provide a fresh insight into the mechanisms underlying poor sexual performance in male captive mammals, and valuable information for the practical management and ex situ conservation of endangered species. PMID:23940532

Bian, Xiaoxing; Liu, Dingzhen; Zeng, Hua; Zhang, Guiquan; Wei, Rongping; Hou, Rong

2013-08-05

415

Hybrid sterility in the mouse  

Microsoft Academic Search

The sterility of bybrids between various mouse species follows Haldane's rule by affecting only the males. Hitberto, five bybrid sterility (Hst) loci have been identified in the mouse genome. Haldane's rule bolds also for chromosomal sterility in all studied mammalian species, including man. The males heterozygous for various male-sterile chromosomal rearrangements show the same meiotic phenotype: partially asynaptic, rearranged autosomes

Ji?í Forejt

1996-01-01

416

Child Support Enforcement and Sexual Activity of Male Adolescents  

ERIC Educational Resources Information Center

Strong child support enforcement requires fathers to take financial responsibility for their children and may also encourage more responsible sexual behavior. Using the 1997-2001 waves of the 1997 National Longitudinal Survey of Youth (N = 4,272), this article examines the association between child support enforcement and the sexual activity of…

Huang, Chien-Chung; Han, Wen-Jui

2007-01-01

417

Child Support Enforcement and Sexual Activity of Male Adolescents  

ERIC Educational Resources Information Center

|Strong child support enforcement requires fathers to take financial responsibility for their children and may also encourage more responsible sexual behavior. Using the 1997-2001 waves of the 1997 National Longitudinal Survey of Youth (N = 4,272), this article examines the association between child support enforcement and the sexual activity of…

Huang, Chien-Chung; Han, Wen-Jui

2007-01-01

418

Effects of Losartan on the Sexual Behavior of Male Rats  

Microsoft Academic Search

Many commonly used antihypertensive drugs such as diuretics and beta-blockers can interfere with sexual function in both sexes, causing loss of libido, impairment of erectile function and ejaculation in men, and delay or prevent orgasm in women. Newly developed antihypertensive drugs should ideally not interfere with the patients’ quality of life including sexual function. This study examined the effects of

Paul Chan; Ju-Chi Liu; Yat-Ching Tong; Yi-Jen Chen; Chia-Chen Wang; Brian Tomlinson; Juei-Tang Cheng

1999-01-01

419

Colorectal surgery and its impact on male sexual function.  

PubMed

The quality of functional outcome has become increasingly important in view of improvement in prognosis with colorectal cancer patients. Sexual dysfunction remains a common problem after colorectal cancer treatment, despite the good oncologic outcomes achieved by expert surgeons. Although radiotherapy and chemotherapy contribute, surgical nerve damage is the main cause of sexual dysfunction. The autonomic nerves are in close contact with the visceral pelvic fascia that surrounds the mesorectum. The concept of total mesorectal excision (TME) in rectal cancer treatment has led to a substantial improvement of autonomic nerve preservation. In addition, use of laparoscopy has allowed favorable results with regards to sexual function. The present paper describes the anatomy and pathophysiology of autonomic pelvic nerves, prevalence of sexual dysfunction, and the surgical technique of nerve preservation in order to maintain sexual function. PMID:23716030

Nagpal, Kamal; Bennett, Nelson

2013-08-01

420

Heterogeneity in male horn growth and longevity in a highly sexually dimorphic ungulate  

Microsoft Academic Search

In sexually dimorphic ungulates, sexual selection favoring rapid horn growth in males may be counterbalanced by a decrease in longevity if horns are costly to produce and maintain. Alternatively, if early horn growth varied with individual quality, it may be positively correlated with longevity. We studied Alpine ibex Capra ibex in the Gran Paradiso National Park, Italy, to test these

P. Bergeron; M. Festa-Bianchet; A. von Hardenberg; B. Bassano

2008-01-01

421

Female aggregation and male competition reduce costs of sexual harassment in the mosquitofish Gambusia holbrooki  

Microsoft Academic Search

Male mosquitofish allocate a large proportion of their time budget to attempting to inseminate unreceptive females. Because females invest considerable time and energy in avoiding unwanted copulations, sexual harassment is expected to conflict with other activities such as foraging. We found that sexual harassment more than halved the foraging efficiency of the female in a task requiring the retrieval of

Andrea Pilastro; Stefano Benetton; Angelo Bisazza

2003-01-01

422

Gender Differences in Experiences of Sexual Harassment: Data from a Male-Dominated Environment  

ERIC Educational Resources Information Center

|The goal of this investigation was to examine gender differences in experiences of sexual harassment during military service and the negative mental health symptoms associated with these experiences. Female (n = 2,319) and male (n = 1,627) former reservists were surveyed about sexual harassment during their military service and current mental…

Street, Amy E.; Gradus, Jaimie L.; Stafford, Jane; Kelly, Kacie

2007-01-01

423

Coercive Sexual Experiences, Protective Behavioral Strategies, Alcohol Expectancies and Consumption among Male and Female College Students  

ERIC Educational Resources Information Center

|Alcohol use and sexual assault on college campuses are highly prevalent and the focus of numerous prevention and intervention efforts. Our goals were to gain a greater understanding of the relationship between coercive sexual experiences, utilization of protective behavioral strategies and alcohol expectancies and consumption among male and…

Palmer, Rebekka S.; McMahon, Thomas J.; Rounsaville, Bruce J.; Ball, Samuel A.

2010-01-01

424

Gender Differences in Experiences of Sexual Harassment: Data From a Male-Dominated Environment  

Microsoft Academic Search

The goal of this investigation was to examine gender differences in experiences of sexual harassment during military service and the negative mental health symptoms associated with these experiences. Female (n = 2,319) and male (n = 1,627) former reservists were surveyed about sexual harassment during their military service and current mental health symptoms. As expected, women reported a higher frequency

Jaimie L. Gradus; Jane Stafford; Kacie Kelly

2007-01-01

425

Parasite faunas, testosterone and secondary sexual traits in male red-winged blackbirds  

Microsoft Academic Search

We examined associations among parasite infections, secondary sexual traits and testosterone in male red-winged blackbirds sampled at the start of the breeding season. Parasites quantified included ectoparasitic lice and mites and endoparasitic blood protozoans, nematodes, trematodes and cestodes. Secondary sexual traits that we quantified included body size, epaulet size and color, song repertoire size and song switching rate, and behavioral

Patrick J. Weatherhead; Karen J. Metz; Gordon F. Bennett; Rebecca E. Irwin

1993-01-01

426

Factors Related to Childhood Sexual Abuse among Gay/Bisexual Male Internet Escorts  

ERIC Educational Resources Information Center

|This exploratory investigation examined the relationship between childhood sexual abuse (CSA) and related psychosocial characteristics and sexual behaviors among 46 gay/bisexual male escorts who advertise via the Internet. More than a quarter of men (28.3%) reported some history of CSA. Men reporting CSA were more likely to be from an ethnic…

Parsons, Jeffrey T.; Bimbi, David S.; Koken, Juline A.; Halkitis, Perry N.

2005-01-01

427

Predictors of Sexually Coercive Behavior in a Nationally Representative Sample of Adolescent Males  

ERIC Educational Resources Information Center

|Data from male participants in the National Longitudinal Study of Adolescent Health are used to examine childhood predictors of late adolescent and early adulthood sexually coercive behavior and adolescent mediators of these relationships. A path analysis shows that experiencing sexual abuse as a child has a direct effect on perpetrating…

Casey, Erin A.; Beadnell, Blair; Lindhorst, Taryn P.

2009-01-01

428

Understanding Sexual Aggression in Male College Students: The Role of Self-Monitoring and Pluralistic Ignorance.  

ERIC Educational Resources Information Center

The authors examined the relationship between self- monitoring and pluralistic ignorance and self-reported sexually aggressive behaviors by freshman and sophomore male college students. Results indicated that self-monitoring style and level of pluralistic ignorance were correlated positively with sexual aggression. The authors review relevant…

Flezzani, Janice D.; Benshoff, James M.

2003-01-01

429

Moral Reasoning of Adolescent Male OffendersComparison of Sexual and Nonsexual Offenders  

Microsoft Academic Search

This study compares the moral reasoning abilities of juvenile sexual and nonsexual offenders using a novel methodology that explores responses to questions addressing morality in a variety of offending contexts. Seven sexual and nine nonsexual adolescent male offenders from a maximum security detention facility in New South Wales, Australia, are presented with and asked to discuss a variety of hypothetical

Peter J. Ashkar; Dianna T. Kenny

2007-01-01

430

Psychiatric Symptoms as a Predictor of Sexual Aggression among Male College Students  

Microsoft Academic Search

The goal of this investigation was to examine psychiatric symptoms as predictors of the frequency and severity of sexually aggressive behaviors that had been perpetrated by college-aged men in the past year. Over 400 undergraduate males completed an assessment of sexual aggression, athletic involvement, fraternity affiliation, alcohol and drug use, mistrust of women, depression, and social anxiety. More than 40%

Esther J. Calzada; Elissa J. Brown; Megan E. Doyle

2011-01-01

431

Coercive Sexual Experiences, Protective Behavioral Strategies, Alcohol Expectancies and Consumption Among Male and Female College Students  

Microsoft Academic Search

Alcohol use and sexual assault on college campuses are highly prevalent and the focus of numerous prevention and intervention efforts. Our goals were to gain a greater understanding of the relationship between coercive sexual experiences, utilization of protective behavioral strategies and alcohol expectancies and consumption among male and female college students. We surveyed 370 college students regarding their past year

Rebekka S. Palmer; Thomas J. McMahon; Bruce J. Rounsaville; Samuel A. Ball

2010-01-01

432

What motivates the sexual double standard? More support for male versus female control theory.  

PubMed

The present research uniquely compared male control theory (MCT) versus female control theory (FCT) to illuminate motives for the sexual double standard (SDS), whereby men gain status from engaging in casual sex or having many sexual partners, but women are stigmatized for it. Consistent with MCT, men were more likely than women to endorse the SDS and to give sexual advice in ways that reinforce it-gender differences that were mediated by hostile sexism (HS) and endorsing the SDS, respectively. The data did not support FCT's argument that women are motivated by sexual economics to restrict female sexuality (Baumeister & Twenge, 2002). Both genders discouraged women from having casual sex to protect women from social stigma and rape myths that justify violence against sexual women. In concert, the findings support MCT more than FCT and suggest that sexism, stigma, and rape myths are primary obstacles to sexual equality. PMID:23386660

Rudman, Laurie A; Fetterolf, Janell C; Sanchez, Diana T

2013-02-01

433

Sexually dimorphic neurons in the ventromedial hypothalamus govern mating in both sexes and aggression in males.  

PubMed

Sexual dimorphisms in the brain underlie behavioral sex differences, but the function of individual sexually dimorphic neuronal populations is poorly understood. Neuronal sexual dimorphisms typically represent quantitative differences in cell number, gene expression, or other features, and it is unknown whether these dimorphisms control sex-typical behavior exclusively in one sex or in both sexes. The progesterone receptor (PR) controls female sexual behavior, and we find many sex differences in number, distribution, or projections of PR-expressing neurons in the adult mouse brain. Using a genetic strategy we developed, we have ablated one such dimorphic PR-expressing neuronal population located in the ventromedial hypothalamus (VMH). Ablation of these neurons in females greatly diminishes sexual receptivity. Strikingly, the corresponding ablation in males reduces mating and aggression. Our findings reveal the functions of a molecularly defined, sexually dimorphic neuronal population in the brain. Moreover, we show that sexually dimorphic neurons can control distinct sex-typical behaviors in both sexes. PMID:23663785

Yang, Cindy F; Chiang, Michael C; Gray, Daniel C; Prabhakaran, Mahalakshmi; Alvarado, Maricruz; Juntti, Scott A; Unger, Elizabeth K; Wells, James A; Shah, Nirao M

2013-05-01

434

Female Burying Beetles Benefit from Male Desertion: Sexual Conflict and Counter-Adaptation over Parental Investment  

PubMed Central

Sexual conflict drives the coevolution of sexually antagonistic traits, such that an adaptation in one sex selects an opposing coevolutionary response from the other. Although many adaptations and counteradaptations have been identified in sexual conflict over mating interactions, few are known for sexual conflict over parental investment. Here we investigate a possible coevolutionary sequence triggered by mate desertion in the burying beetle Nicrophorus vespilloides, where males commonly leave before their offspring reach independence. Rather than suffer fitness costs as a consequence, our data suggest that females rely on the male's absence to recoup some of the costs of larval care, presumably because they are then free to feed themselves on the carcass employed for breeding. Consequently, forcing males to stay until the larvae disperse reduces components of female fitness to a greater extent than caring for young singlehandedly. Therefore we suggest that females may have co-evolved to anticipate desertion by their partners so that they now benefit from the male's absence.

Boncoraglio, Giuseppe; Kilner, Rebecca M.

2012-01-01

435

Abnormal Sexual Behavior in an Adult Male with Obsessive Compulsive Disorder  

PubMed Central

A male patient with homosexual obsession in obsessive compulsive disorder shows a better outcome following a combination of pharmacotherapy and psychotherapy. This case report emphasizes the importance of combination therapy in obsessive compulsive disorder with abnormal sexual impulses and behavior.

Raguraman, Janakiraman; Priyadharshini, Kothai R.; Chandrasekaran, R.; Vijaysagar, John

2004-01-01

436

DISTURBED SEXUAL CHARACTERISITCS IN MALE MOSQUITOFISH (GAMBUSIA HOLBROOKI) FROM A LAKE CONTAMINATED WITH ENDOCRINE DISRUPTORS.  

EPA Science Inventory

Previous laboratory studies have demonstrated that estrogenic and antiandrogenic chemicals can alter several sexual characteristics in male poeciliid fishes. Whether similar disturbances occur under field conditions remains to be confirmed. Lake Apopka, Florida, is contaminated w...

437

Cytological Characterization and Allelism Testing of Anther Developmental Mutants Identified in a Screen of Maize Male Sterile Lines  

PubMed Central

Proper regulation of anther differentiation is crucial for producing functional pollen, and defects in or absence of any anther cell type result in male sterility. To deepen understanding of processes required to establish premeiotic cell fate and differentiation of somatic support cell layers a cytological screen of maize male-sterile mutants has been conducted which yielded 42 new mutants including 22 mutants with premeiotic cytological defects (increasing this class fivefold), 7 mutants with postmeiotic defects, and 13 mutants with irregular meiosis. Allelism tests with known and new mutants confirmed new alleles of four premeiotic developmental mutants, including two novel alleles of msca1 and single new alleles of ms32, ms8, and ocl4, and two alleles of the postmeiotic ms45. An allelic pair of newly described mutants was found. Premeiotic mutants are now classified into four categories: anther identity defects, abnormal anther structure, locular wall defects and premature degradation of cell layers, and/or microsporocyte collapse. The range of mutant phenotypic classes is discussed in comparison with developmental genetic investigation of anther development in rice and Arabidopsis to highlight similarities and differences between grasses and eudicots and within the grasses.

Timofejeva, Ljudmilla; Skibbe, David S.; Lee, Sidae; Golubovskaya, Inna; Wang, Rachel; Harper, Lisa; Walbot, Virginia; Cande, William Zacheus

2013-01-01

438

T-URF 13 Protein from Mitochondria of Texas Male-Sterile Maize (Zea mays L.) 1  

PubMed Central

The protein T-URF13 (URF13) is specific to mitochondria of maize (Zea mays L.) with Texas (T) male-sterile cytoplasm and has been implicated in causing male sterility and susceptibility to T-cytoplasm-specific fungal diseases. T-URF13 was purified from isolated mitochondria from maize (line B73) with T cytoplasm by gel filtration and a quasi two-dimensional polyacrylamide gel electrophoresis system. Antibodies to the purified and denatured protein were produced in rabbits. Anti-T-URF13 antiserum was used to show that T-URF13 is in the inner membrane of mitochondria and behaves as an integral membrane protein when mitochondria are fractionated with sodium carbonate or Triton X-114. The antiserum and protein A tagged with 20-nanometer-gold particles were used to localize T-URF13 in T mitochondria by electron microscopy of sections of isolated mitochondria from etiolated shoots and sections of roots and of tapetal cells at pre-and post-degeneration stages of microsporogenesis. The microscopic study confirms that T-URF13 is specifically localized in the mitochondrial membranes of all of the T mitochondria tested, notably those in the tapetum from the meiocyte stage to the late-microspore stage. No change in the amount of labeled T-URF13 protein in the mitochondria of aging tapetal cells was detected. Images Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Hack, Ethan; Lin, Chentao; Yang, Hongyun; Horner, Harry T.

1991-01-01

439

Identification of aberrant chromosomes on the basis of morphometry of synaptonemal complexes in the sterile male mouse  

SciTech Connect

The results of an investigation of the synaptonemal complexes (SCs) of spermatocytes of sterile males of the house mouse from the progeny of parents subjected to the action of a mutagen are presented in this study. A nonreciprocal translocation was readily identified by the configuration of the SCs. The translocation was observed at pachytene in 100% of cells; at diakinesis-metaphase I, in 58% of cells. A different pattern of association of the X chromosome with the rearrangement region was found in pachytene spermatocytes. Computer analysis of the relative lengths of the synaptonemal complex during the pachytene stage permitted the determination that the translocation took place from the 4th autosome to the 16th. The translocated segment was 66-75% of chromosome 4. In chromosome 16 the point of rupture is close to the distal end, and it was not possible to find the broken-off telomeric fragment of this chromosome in the male under study.

Kalinskaya, E.I.; Chepyzhov, V.V.; Bogdanov, Yu.F.

1989-01-01

440

MEDFLY (DIPTERA: TEPHRITIDAE) GENETIC SEXING: LARGE-SCALE FIELD COMPARISON OF MALES-ONLY AND BISEXUAL STERILE FLY RELEASES IN GUATEMALA  

Technology Transfer Automated Retrieval System (TEKTRAN)

The effect of releases of bisexual (males and female) and unisexual (male only) sterilized medflies was compared in three large field evaluations over a 3-year period (1995 - 1997) in southwestern Guatemala. The two strains tested were a genetic sexing strain, Vienna-4/Tol-94, carrying the temperatu...

441

Immune activation affects chemical sexual ornaments of male Iberian wall lizards  

Microsoft Academic Search

Many animals use chemical signals in sexual selection, but it is not clear how these sexual traits might have evolved to signal\\u000a honestly male condition. It is possible that there is a trade-off between maintaining the immune system and the elaboration\\u000a of ornaments. We experimentally challenged the immune system of male Iberian wall lizards, Podarcis hispanica, with a bacterial antigen

Pilar López; Marianne Gabirot; José Martín

2009-01-01

442

Effects of Eurycoma longifolia Jack on sexual behaviour of male rats  

Microsoft Academic Search

The effects ofEurycoma longifolia Jack were studied on the sexual behaviour of male rats. Sexually normal male rats were treated twice daily with 500 mg kg?1 of different fractions ofE. longifolia Jack for 10 days prior to test and were then observed for their copulatory behaviour with a receptive female in a copulation\\u000a cage. Results showed that was a significant

Hool Hoon Ang; Meng Kwoon Sim

1997-01-01

443

Lateralization of a Sexually Dimorphic Brain Area Associated With Steroid-Sensitive Behavior in the Male Gerbil  

Microsoft Academic Search

Emission rates of an androgen-sensitive male courtship vocalization were positively correlated with the volume of only the left hypothalamic sexually dimorphic area, pars compacta (SDApc) nucleus in sexually active male Mongolian gerbils. The asymmetric relationship between brain nucleus and vocal behavior was confirmed in testosterone (T)-treated castrated adult males but was eliminated by castration of males and did not exist

S. D. Holman; J. B. Hutchinson

1993-01-01

444

The potential for sexual selection in males: Effect of sex ratio and spatiotemporal distribution of receptive females  

Microsoft Academic Search

Summary An animal mating system characterized by male-male competition and active searching for sexually receptive females was modelled to study how varying sex ratio and spatiotemporal distribution of receptive females can affect the variance in male mating success (i. e. potential for sexual selection) in males. The temporal distribution of female receptivity periods appeared to be the variable that had

Rolf Anker Ims

1988-01-01

445

The nuclear gene Rf3 affects the expression of the mitochondrial chimeric sequence R implicated in S-type male sterility in maize  

Microsoft Academic Search

The mitochondrial genomes of maize plants exhibiting S-type cytoplasmic male sterility (cms-S) contain a repeated DNA region designated R. This region was found to be rearranged in the mitochondria of all cms-S cytoplasmically revertant fertile plants in all nuclear backgrounds analyzed. A 1.6-kb mRNA transcribed from the R region in mitochondria of sterile plants was absent from all cytoplasmic revertants

G. Zabala; S. Gabay-Laughnan; J. R. Laughnan

1997-01-01

446

Comparative genetic analysis and molecular mapping of fertility restoration genes for WA, Dissi, and Gambiaca cytoplasmic male sterility systems in rice  

Microsoft Academic Search

The genetic relationship among three cytoplasmic male sterility (CMS) systems, consisting of WA, Dissi, and Gambiaca, was\\u000a studied. The results showed that the maintainers of one CMS system can also maintain sterility in other cytoplasmic backgrounds.\\u000a The F1 plants derived from crosses involving A and R lines of the respective cytoplasm and their cross-combination with other CMS\\u000a systems showed similar

Majid Sattari; Arumugam Kathiresan; Glenn B. Gregorio; Sant S. Virmani

2008-01-01