Groups of butterfly species established under high-mountain conditions in the southeastern Russia were described. The role of species with different distribution including arctic-alpine and alpine ones typical of these conditions in the species composition was considered. Fifteen local faunas inhabiting the areas of Buryatia, Chita, Amur, and Sakhalin Regions, and Khabarovsk and Maritime Territories were taxonomically analyzed. The common faunistic background was found in the mountains of the Mongolian-South-Siberian and East-Siberian provinces, while only some elements of the high-mountain fauna were observed at individual elevations of the South-Okhotsk province. PMID:17352197
Wading birds at Lagoa da Pampulha: Habitat selection and diurnal activity. The wading bird communities in lacunar systems are mainly structured based on the availability and distribution of feeding resources and appropriate conditions for their reproduction and establishment. As a result, in a given habitat, each species selects, according to the possibilities of its behavioral repertoire, the best way to
Flávio E. Pimenta; João C. P. Drummond; Ana C. Lima
Pastoral landscapes are complex mosaics of pastures, crop fields, forest fragments and other types of tree cover. In order to asses the value of these landscapes for biodiversity conservation, the diver- sity of dung beetles and butterflies was characterized in a pastoral landscape in Rivas, Nicaragua. In addition, the abundance, species richness, and diversity of dung beetles and butterflies were
Blas Hernández; Jean-Michel Maes; Celia A. Harvey; Sergio Vílchez; Arnulfo Medina; Dalia Sánchez
Patterns of formation of island Rhopalocera fauna at the northern forest boundary in the region of Valdai inland ice were analyzed by the example of White Sea islands. The ecotone effect, typical for northernmost taiga and forest-tundra and introducing the transitional Rhopalocera fauna in near-tundra forest between the boreal and hypoarctic zones, was not observed on the White Sea islands. Island isolation provided for the absence of some Arctic species, entering near-tundra forest from the North, in the island fauna. Island Rhopalocera faunas represent poor variants of the northern taiga fauna lacking some polyzonal and temperate species and having a reduced set of Arctic boreal species. PMID:16771146
Volatile halogenated organic chemicals are found in indoor and outdoor air, often at concentrations substantially above those in remote, unpopulated areas. The outdoor ambient concentrations vary considerably among sampling stations throughout the United States, as well as diurna...
Â´metros de temperaturas diurnas. EstimeÂ´ el uso diurno de energiÂ´a y la peÂ´rdida de agua por evaporacioÂ´n y estimaciones de peÂ´rdida de agua por evaporacioÂ´n fueron considerablemente maÂ´s bajas en nidos que en a aparentemente reduce la peÂ´rdida diurna de agua por evaporacioÂ´n, lo que sugiere que el balance de agua puede
Los mazos de tubos que forman parte de los equipos intercambiadores de calor, condensadores y generadores de vapor del tipo tubo-carcaza pueden presentar fallas originadas en excesivas vibraciones inducidas por la circulación de fluído. Estas vibraciones pueden originarse en cambios en las condiciones de ope ración del equipo o en una deficiente evaluación de las mismas realizada durante el diseño.
RESUMEN La enfermedad de hígado graso no alcohólica, en inglés non alcoholic fatty liver disease (NAFLD), es definida como una acumulación excesiva de grasa en los hepatocitos. Presenta una prevalencia mundial de alrededor del 15 al 25%. Los factores de riesgo asociados frecuentemente a NAFLD son obesidad, diabetes tipo 2 y dislipemia. Por un lado se ha propuesto que una
Here, we monitor the effects of ectopic overexpression of genes for pea asparagine synthetase (AS1) in transgenic tobacco (Nico- tiana tabacum). lhe AS genes of pea and tobacco are normally expressed only during the dark phase of the diurna1 growth cycle and specifically in phloem cells. A hybrid gene was construded in which a pea AS1 cDNA was fused to
Timothy Brears; Christopher Liu; Thomas J Knight; Gloria M. Coruzzi
subprincipal componen un bloque de campo o secci?n de riego. Varios bloques de campo pueden ser agrupados juntos formando una estaci?n o zona de riego, y pueden operar simult?neamente. El agua se suministra a las l?neas de goteo de los bloques de campo por... por una v?lvula y l?nea distribuidora separada, para poder suministrar agua por ambos extremos de la l?nea de goteo. Esto previene la p?r- dida de presi?n excesiva en las l?neas de goteo m?s largas. La l?nea de lavado siempre debe tener una v?lvula de...
In 1868, Lydia Becker (1827-1890), the renowned Manchester suffragist, announced in a talk before the British Association for the Advancement of Science that the mind had no sex. A year later, she presented original botanical research at the BAAS, contending that a parasitic fungus forced normally single-sex female flowers of Lychnis diurna to develop stamens and become hermaphroditic. This essay uncovers the complex relationship between Lydia Becker's botanical research and her stance on women's rights by investigating how her interest in evolutionary theory, as well as her correspondence with Charles Darwin, critically informed her reform agendas by providing her with a new vocabulary for advocating for equality. One of the facts that Becker took away from her work on Lychnis was that even supposedly fixed, dichotomous categories such as biological sex became unfocused under the evolutionary lens. The details of evolutionary theory, from specific arguments on structural adaptations to more encompassing theories on heredity (i.e., pangenesis), informed Becker's understanding of human physiology. At the same time, Becker's belief in the fundamental equality of the sexes enabled her to perceive the distinction between inherent, biological differences and culturally contingent ones. She applied biological principles to social constructs as she asked: Do analogous evolutionary forces act on humans? PMID:23961688