Dec 18, 1998 ... Absorption lines are discrete colors of light that are absorbed by intervening matter; this absorption leaves holes or "lines" in the ...
NASA Website
The absorption of phosphate by eelgrass (Zostera marina L.) was studied using 32P in a partitioned container where leaves were separated from roots and rhizomes. Absorption, which was greatest in the light, occurred through both leaves and roots, and the ...
National Technical Information Service (NTIS)
... for an illustration of pro rata absorption of losses subject to a SRLY limitation...absorbed by the P group in Year 4. Absorption of this loss leaves $120 of the group's...group's CNOL deduction for Year 4. The absorption of this loss leaves $70 of the...
Code of Federal Regulations, 2011
Differential Absorption (APDA) technique and described an iterative scheme to .... leaves contain significant amounts of water, a data base for 125 ...
... lower leaves or to immature upper stem or leaves of cotton. 14C absorption by 12-leaf cotton within 24 HAT exceeded ... stem tissue damage by flumioxazin may allow continued absorption of the ... to matu...
NBII National Biological Information Infrastructure
... trends similar to those from EEMs. For example, absorption spectra from attached leaves were different from absorption spectra from fallen leaves during low-water and ... ...
The food chain availability of technetium incorporated into plant tissue, its chemical form in corn leaves, and the potential for gastrointestinal absorption of plant-incorporated technetium was investigated. Technetium-95m was incorporated into corn leav...
Reflectance, transmittance and absorptance spectra of normal and six types of nutrient-deficient (N,
NASA Technical Reports Server (NTRS)
Abstract: ... and stems) and solar radiation absorption (leaves). These investments permit individuals to overshadow competitors and provide for transport ...
... way to introduce the sound wave into the specimen and detect the sound wave leaving the specime. ... to make accurate absorption measure- ...
DTIC Science & Technology
... the sharp edge in the absorption band of a filter. ... lasers are directional. This is to say that all the photons leaving the laser head are ...
The effect of surface heterogeneity on cloud absorption estimates Geoph. .... Scattering by Lambertian-leaves canopy dependence on leaf-area projections ...
Plant leaves and humus were collected from three areas with and without mercury emission sources. Mercury in these samples were determined by cold flameless atomic absorption spectrometry. A part of mercury emitted from the source into the atmosphere is absorbed by plant leaves, and move to humus through fallen ...
Energy Citations Database
The process of absorption is a cellular process (microscopic). Absorption cells line the stomach and intestine walls and allow small nutrients (broken down from the food we eat) to pass through and into our blood. The process of absorption is much like a leaking balloon filled with water. The balloon is the stomach or intestine, the ...
NSDL National Science Digital Library
The effect of light intensity and relative humidity on the absorption of airborne I/sup 131/ in tracer concentrations onto attached leaves of broad bean (Vicia fava) was determined. It is shown that the rate of absorption onto leaves is controlled by the rate of diffusion of the gas through stomata on the ...
Fourier transform infrared spectroscopy (FTIR) was used to study three group tobacco leaves of brown spot, angular spot and weather speck, with each group being composed of three samples, namely, leaf spots, near-spot and normal tobacco leaves. The results indicate that the absorption ratio A1631/A1025 of the three group tobacco ...
PubMed
This animation describes how herbicides are taken up by leaves and illustrates how physico-chemical characteristics alter their movement across cuticles. Passive and active mechanisms of herbicide absorption across plant membranes into cells are shown as well.
... only distinguish between poikilohydric taxa capable of water absorption through leaves and homoiohydric taxa incapable of doing so. Historically, ... days until reaching weight constancy. Water loss and a...
... No plant species translocated over 2% of applied radioactivity below the treated leaves. Most of the metabolites ... averaged 51, 48, 30, and 25% of the radioactivity detected in the treated leaves of cot...
The fate of radiation incident on the leaves of some African crop plants is examined. Transmission coefficients for photosynthetically active radiation are 0.05-0.10 for mature leaves and 0.09-0.39 for young leaves. Increasing the angle of incidence of radiation results in a rise in reflectivity and a fall in ...
... 1. AGENCY USE ONLY (Leave blank) 2. REPO1RT DATE 3EPRTYE AND DATES ... be performed at a wavelength based on the absorption profile of ...
... under alkaline conditions. Previous research has shown trifloxysulfuron absorption into leaves of certain weeds can be influenced by the ... ...
Nov 12, 2000 ... These gas clouds leave numerous absorption lines in a distant quasar's spectra, together called the Lyman-alpha forest. ...
Using a measurement known as Leaf Area Index, scientists have now found a way to ... Graph of Chlorophyll Absorption. The amount and extent of vegetation, ...
... 22 4.1 Absorption ..... ... When the ground warms In the morning, fog at the surface may lift and leave a stratus layer aloft. ...
and Hibiscus. (with a higher chlorophyll content) it is cleat_, that the upper limit for ... Detailed absorption spectra of leaves of Geranium and Hibiscus ...
These include normalized water leaving radiance spectra L-WN, absorption spectra due to phytoplankton, non-pigmented particles and chromophoric dissolved ...
... for 20 s in a second 10-ml methanol�water solution. Plants were sectioned into leaves of the top section, ... ...
... 5... - It should be noted that in the case of selective light absorption 3 ... or due to thermav energy, leaves-the ion, --which- corrFp.onds -to- he - J ...
... a significant amount of glyphosate remains trapped in leaves. Recently we reported that glyphosate absorption was correlated with droplet size and concluded that ... ...
... ingestion by the adult Diaprepes root weevil plus absorption of residues from leaves into eggs was evaluated in experiment 1. Three ... ...
... caused by the carriers leaving the ... effects of higher carrier densities on the ... ABSORPTION COEFFICIENTS, DELAY, DENSITY, ELECTRIC FIELDS ...
to an absorption model. Even after removing external sources,. there is still leaves a substantial local component, which retains. a halo/plane asymmetry. ...
to energy, absorption and radiation of long wave radiation by ..... distribution of leaving long wave radiation Fm for the winter and summer periods. ...
The study using labeled sulfur dioxide (Nikolayevskiy, et al., 1971) establishes that the susceptibility to injury of leaves by sulfur dioxide, in trees, flowers, lawn grasses and weeds, is directly proportional to the rate of absorption of the gas and fo...
... 1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT ... Energy Absorption of Graphite/Epoxy Plates Using Hopkinson Bar Impact ...
Calibration and use of the Zeeman Atomic Absorption (ZAA) system to measure Cd are discussed. The results of measurements of NBS Standard Reference Material (SRM) 1571, Orchard Leaves comparing the ZAA and NBS results are tabulated. A second run shows the...
A summary is presented of results of studies on the absorption of radionuclides by plants following application to above-ground parts. Several techniques for measuring foliar absorption by means of radioisotopes were developed. It was shown that absorption also occurs through aboveground parts other than ...
In this study, wheat leaves infected with brown rust, a plant disease of serious economic concern caused by the fungus Puccinia triticina, were investigated using spatially resolved XANES (X-ray Absorption Near Edge Structure) spectroscopy at the sulfur K-absorption edge.
NASA Astrophysics Data System (ADS)
At 1722 nm wavelength, there is an absorption feature of leaf dry matter based on a C¿H stretch overtone, which is difficult to detect in fresh green leaves due to the absorption spectrum of liquid water. We applied a method originally proposed by B. -C. Gao and A. F. H. Goetz (1994, Remote Sensing ...
Technology Transfer Automated Retrieval System (TEKTRAN)
Absorption and reflectance spectra of maple (Acer platanoides), cotoneaster (Cotoneaster alaunica), dogwood (Cornus alba) and pelargonium (Pelargonium zonale) leaves with a wide range of pigment content and composition were studied in visible and near-infrared spectra in order to reveal specific anthocyanin (Anth) spectral features in ...
Light absorption was quantified in the following systems: isolated chloroplasts and leaves of spinach (Spinacea oleracea L.), a mutant of geranium (Pelargonium zonale L.) widely differing in pigment content, and coleus (Coleus blumei Benth.) at different stages of leaf ontogenesis. For these species and pea (Pisum sativum L.), scattering-compensated ...
...to a member when the member leaves the group prior to recapture...operating losses to a member who leaves the group. However, the rules differ somewhat because the absorption rule of § 1.1502-21...the group. When a member leaves the group, each...
Code of Federal Regulations, 2010
Herbicides must be absorbed into plants in order to be effective. Herbicide absorption can occur through leaves, roots or both. The process by which herbicides kill weeds, called mode of action, requires herbicide absorption and may also require herbicide movement or translocation within the plant. Translocation means that the ...
Viola tricolor, Frigonella foenum-graecum, Laurus nobilis were shown to reduce the glucose transport. The same was true for extract of tea leaves. Fructose did not affect the velocity of free glucose absorption, slightly reduced the velocity of sucrose hydrolysis and absorption of produced hexoses and water. Participation of active ...
...taxable income available for absorption after a bad debt deduction...applying the rules for loss absorption in computing consolidated...ii) of this section. That leaves a $10 total amount available...is limited, under the loss absorption limit of paragraph...
Absorption and translocation of chemicals by cotton leaves are greatly increased under conditions of high humidity. This enhanced movement consists of increased phloem transport and induced uptake into and transport via the xylem. Studies with starved and normal leaves prove that phloem transport is greatly reduced in ...
Atomic Absorption Spectrophotometry was used to analyze the leaves for lead. The tissue of the leaf was finely ground and analyzed directly, no ashing or chemical digestion of the tissue was used. A base line for the lead content in elm tree leaves has been established for the summer of 1972. The lead content in the elm ...
The absorption and translocation of phosphorus-32, iron59, and strontium- 89 by the leaves of 10-day-old corn plants were studied as functions of pH. The pH of the solution in which the mineral ion is supplied to the corn plants had a significant effect on absorption. For the three mineral ions studied, greater ...
The absorption and transport of calcium in tomatoes is studied hydroponically by using a Hoagland nutrient solution at half strength. Ca/sup 45/ is used as the tracer. On account of the high temperature of the laboratory, transpirational loss of water is heavy, and the solution has to be checked every day and made up to strength. The above ...
The optical properties of leaves from five species, Norway maple (Acer platanoides L.), cotoneaster (Cotoneaster alaunica Golite), hazel (Corylus avellana L.), Siberian dogwood (Cornus alba L.), and Virginia creeper (Parthenocissus quinquefolia (L.) Planch.), differing in pigment composition and at different stages of ontogenesis, were studied. Anthocyanin ...
PubMed Central
Emission fluorescence spectra were obtained for the adaxial and abaxial faces of dicotyledonous (Ficus benjamina L., Ficus elastica, Gardenia jasminoides and Hedera helix) and monocotyledonous leaves (Gladiolus spp. and Dracaena cincta bicolor). After correction by light-re-absorption processes, using a previously published physical model, the adaxial ...
The spectral variation of canopy reflectance is mostly governed by the absorption properties of the elements, hence the leaves, since their intrinsic scattering properties show very little spectral variation. The relationship between canopy reflectance an...
The wax structures on leaf surfaces are of great significance for both the deposit of solid and liquid aerosols and for the absorption of gaseous materials. With respect to their behavior toward aerosols, plants can be divided into two large groups. Plant...
... Plants were harvested 48 h after treatment and radioactivity was determined in treated leaf, other leaves, crown, ... not involved in glyphosate resistance. The amount of radioactivity translocated from t...
In Aloe arborescens Mill. leaves, strong sunlight or its combination with drought induces the accumulation of the red keto-carotenoid, rhodoxanthin. Simultaneously, the transformation of chloroplasts into chromoplasts accompanied by degradation of thylakoid membranes and formation of plastoglobuli, large in size and number, takes place. Depending on stress conditions the build ...
The absorption coefficient (k), infinite reflectance (R), and scattering coefficient (s) were tabulated for five wavelengths and analyzed for statistical differences for seven weed species. The wavelengths were: 0.55-micrometer, 0.65-micrometers, 0.85-mic...
... S., S. Agustí & C. M. Duarte. 1992. Light absorption by seagrass Posidonia oceanica leaves. Mar. Ecol. Prog. Ser. 86:201�204. CrossRef, ... ...
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... treatments. But some have flowered and doubled their leaves, while others remain tiny�ten times smaller! Their leaf absorption has also varied widely. Some sloths have near- ... ...
The specific objectives of this project were: (1) to understand quantitatively how the accuracy of dust parameter and ocean color estimates from hyperspectral data depend on knowledge of vertical aerosol distributions and dust particle absorption; (2) to ...
... harvest. K was analyzed by the PerkinElmer 30303B atomic absorption ... (leaves, stems, cobs, and dry weight of grains) was assessed at 42 and 63 ... ...
A total of 139 reflectance spectra (between 350 and 2500 nm) from coast live oak (Quercus Agrifolia) leaves were measured in the laboratory with a spectrometer FieldSpec«Pro FR. Correlation analysis was conducted between absorption features, three-band ratio indices derived from the spectra and corresponding relative water content (RWC, %) of oak ...
... Bonferroni post hoc tests. Table 3. Nutrient re-absorption (%) from senescing leaves of Vaccinium myrtillus and V. vitis-idaea at ... ...
A series of investigations, using phosphorus-32 as a tracer, was carried out to measure the uptake through the roots and leaves in healthy plants and the effects of disease on phosphorus uptake in plants. (C.H.)
...effective with respect to its subsidiary S for 1966. If S leaves the group at the beginning of calendar year 1967, such...applicable limitation for the consolidated return year. (2) Absorption rules. For purposes of determining the amount, if...
Two portable instruments, designed to evaluate epidermal UV screening in leaves, were compared: the Dualex and the UV-A-PAM fluorimeter. Both instruments excite chlorophyll fluorescence at the same UV wavelengths but reference excitation is in the red and the blue spectral range in the former and the latter fluorimeter, respectively. When analyzing green ...
The reabsorption of particles in the same nucleus where they were produced, is investigated. The model supposes incoherent interaction of the nucleons with the primary particle and with the secondaries and is limited to such high energies where this assumption holds good. An absorption coefficient is calculated, which relates the actual number of secondaries ...
Lead and cadmium were determined in soil samples taken from various locations near highways and gas stations, after both acid and acetate extractions, and in leaves after digestion in nitric acid. For soils, acid extraction gave consistently higher results than did acetate. The lead levels in all soils and leaves were sufficiently high that a standard ...
We surveyed24 plant species to examine howleaf anatomyinfluencedchloroplast movement and how the optical properties of leaves changewith chloroplast position.All species examined exhibited light-dependent chloroplast movements but the associated changes in leaf absorptance varied considerably inmagnitude.Chloroplast movement dependent changes in leaf ...
Nitrogenase activity was measured in leaves along the main stem axes of Azolla pinnata R. Br. The activity was negligible in leaves of the apical region, rapidly increased to a maximum as leaves matured, and declined in aging leaves. In situ absorption and fluorescence emission spectra were ...
The effects of a number of growth substances on the absorption and translocation of iron were studied in bean plants. Gibberellic acid application to the trifoliate leaf enhanced absorption of Fe applied to the primary leaf. 2-Chloroethyltrimethylammonium chloride increased absorption by the primary leaf while 6-furfurylaminopurine ...
Reflectance, transmittance and absorptance spectra of normal and six types of nutrient-deficient (N, P, K, S, Mg, and Ca) maize (Zea mays L.) leaves were analyzed at 30 selected wavelengths from 500 to 2600 nm. The analysis of variance showed significant ...
Present investigation was carried out to estimate mineral elements in Rheum emodi Wallr. by atomic absorption spectroscopy. The samples of R. emodi Wallr., both wild and cultivate populations, were collected from different localities at different altitudes of Uttarakhand, India. The concentration of micro- and macroelements was different in roots and ...
& Forest Floor DEMCanopy DSM & Forest Floor DEM �� LeavesLeaves :Absorb:Absorb PARPAR(Photosynthetic(Photosynthetic Floor)(Forest Floor) 6.6. Data Analysis and Application for TotalData Analysis and Application for TotalVertical Radiation Distribution :: Result of RadiationResult of Radiation Absorption, Defuse, Transmission in Forest
E-print Network
Foliar-applied magnesium was readily absorbed (10% in 24 hours) but was not translocated out of the treated primary leaves of seedling or fruiting bean plants within 24 hours. Magnesium applied to the root medium was absorbed and distributed throughout the plant. In fruiting plants 33% of the root-absorbed Mg/sup 28/ was recovered in the stem and 32% in the pods and seeds. The ...
An experiment in which methods of the spectroscopy of light-scattering media were used to determine the optical constants of plant leaves is described. The true absorption spectrum of the pigment mixture in the living leaf of Morus nigra was obtained. The effect of boundaries was corrected for by means of the Ryde-Cooper formulas.
The temperature of the flue gas entering a spray dryer SO2 absorption chamber is increased so as to maintain the temperature of the flue gas leaving the spray dryer SO2 absorption chamber at a preselected temperature above the adiabatic saturation temperature of the flue gas so as to permit greater amounts of sulfur oxide absorbent ...
Developments in the foliar application of fertilizer are reviewed, Topics discussed include techniques and methods for the measurement of foliar absorption of fertilizers, plant processes associated with the foliar absorption and transport of nutrients from leaves to other plant parts, the correction of nutrient deficiencies by ...
A simple analog to the SIPA (stress-induced preferential absorption) model for radiation creep is presented. New and interesting results are demonstrated for estimating the preferential absorption of interstitials at dislocations leaving a net vacancy current to voids and producing the well-known void swelling effect. (FS)
The concentration power of plant tissues and the translocation speed of mineral salts vary considerably with the absorbed salt, the botanical species, the considered tissue, and the part of the vegetative cycle. In Grenoble, with Picea excelsa, the true dormance is short and is accompanied by a pre-dormance period and a post dormance period. In the vegetative period, Picea excelsa ...
It will be shown that the peaks in the (? p) and (? d) invariant mass distributions, observed in recent FINUDA experiments and claimed to be signals of deeply bound kaonic states, are naturally explained in terms of K ? absorption by two or three nucleons leaving the rest of the original nuclei as spectator. For reactions on heavy nuclei, the subsequent ...
Shoots of three cultivars of Petunia hybrida Vilm. of differing ozone (O/sub 3/) and sulphur dioxide (SO/sub 2/) sensitivity were exposed to O/sub 3/ and SO/sub 2/ in closed chambers for observation of pollutant absorption through the stomates and adsorption by leaf surfaces. The cultivar least sensitive to injury, 'Capri', absorbed the least ozone or SO/sub ...
Shoots of three cultivars of Petunia hybrida Vilm. of differing ozone (O/sub 3/) and sulfur dioxide (SO/sub 2/) sensitivity were exposed to O/sub 3/ and SO/sub 2/ in closed chambers for observation of pollutant absorption through the stomates and adsorption by leaf surfaces. The cultivar least sensitive to injury, Capri, absorbed the least ozone or SO/sub 2/ but adsorbed the ...
Paths by which fission products may enter the human diet are reviewed with emphasis on mechanisms of absorption and distribution by aboveground plant parts. Results are presented from a number of tracer studies on the absorption and subsequent distribution in plants of fission products deposited on fruits, leaves, and stems, ...
Low iodine in vegetation is responsible for the occurrence of iodine deficiency in human body. It is of important scientific and practical implications to thoroughly understand the absorption and accumulation process of iodine in vegetation and to seek efficient pathways supplementing iodine for human health. Through aquaculture trial of green vegetable, the dynamic ...
The reconstruction of photoacoustic images typically neglects the effect of acoustic absorption on the measured time domain signals. Here, a method to compensate for acoustic absorption in photoacoustic tomography is described. The approach is based on time-reversal image reconstruction and an absorbing equation of state which separately accounts for ...
The impact of coal-burning emission on sulfur in camphor leaves was investigated using Proton Induced X-ray Emission (PIXE) and synchrotron radiation technique X-ray Absorption Near-Edge Structure (XANES) spectroscopy. The PIXE results show that the sulfur concentrations in the leaves collected at the polluted site are significantly ...
Since every matter has its distinctive absorption and transmission capacity of terahertz, Terahertz time domain spectroscopy provides a powerful means to distinguish the different parts of objects. The transmittance of terahertz under different frequency can reflect the absorption distribution of the different parts of the samples. The phase shift of the ...
(4) The cadmium is highly toxic and for all biota in very small concentrations, these study was to know the limit of phitotoxicity and nutrition of cadmium in bean cultivars variety black Jamapa, and to measure absorption of cadmium in roots, stem, leaves and grain. The experiment was carried out in plots with bean of the black variety Jamapa, in ...
An omni-directional fibre optic microprobe was used to measure the quantity and quality of light within the leaves of six succulents having epidermal windows, three species having a subterranean growth habit (Haworthia truncata, Lithops olivacea, and Opthalmophyllum longum) and three growing above ground (Peperomia dolabriformis, P. graveolens, and the sprawling vine Senecio ...
The shape of the light response curve of individual leaves has recently become important in models for light absorption by field crops. Studies of the light response of individual corn leaves under sunlight is discussed. A leaf chamber technique for the continuous measurement of net assimilation of CO/sub 2/ by a leaf or corn ear was ...
Bracts that lacked chlorophyll were compared with rosette leaves on the Chinese glasshouse plant Rheum alexandrae Batalin. The structures were analyzed anatomically and with photospectrometry. Histological features were significantly different between the bracts and the rosette leaves. Epidermal pavement cells and palisade cells were larger in the bracts ...
The study material consisted of five herbs: chamomile (flowers), mint (leaves), St John's wort (flowers and leaves), sage (leaves) and nettle (leaves), sourced from three producers. The calcium, magnesium, iron, zinc and copper contents were determined for both dried herb samples and prepared infusions, and the ...
This dissertation examined the possibility of detecting water deficit stress (WDS) in plants using optical signals collected from leaves. Three theoretical approaches were investigated in general, one of which was investigated in more detail. This study examined if spectrally resolved chlorophyll fluorescence yields unique signatures in response to the development of WDS, but ...
A method for the analysis of sulfur (S) in plant by molecular absorption of carbon monosulfide (CS) using a high-resolution continuum source atomic absorption spectrometer (CS AAS) with a fuel-rich air/acetylene flame has been devised. The strong CS absorption band was found around 258 nm. The half-widths of some ...
A new absorption cycle, using heat as the energy source, was proposed to produce refrigeration. This proposed cycle, referred to as the single-effect regenerative absorption cycle or cycle 1R, has a performance much superior to the well-known basic absorption cycle, namely: the coefficient of performance (COP) is higher at higher input ...
DOE Information Bridge
Transmittance spectra of solid and vapor samples of trinitrotoluene (TNT) in the spectral range 0.6 to 10 THz at resolutions up to 1 GHz are reported. Uniform solid samples of ~100 ?m thickness gave stronger absorption and more resolved structure than previous studies. New absorption lines for TNT solid below 100 cm-1 are reported. A heated 10 m multpass ...
The absorption of sunlight by oceanic constituents significantly contributes to the spectral distribution of the water-leaving radiance. Here it is shown that current parameterizations of absorption coefficients do not apply to the optically complex waters of the Crimea Peninsula. Based on in situ measurements, parameterizations of ...
Progress is reported in studies on mechanisms of uptake of ions by above- ground plant parts and their subsequent transport and redistribution within the plant. Results are reported from studies on the absorption and transport of Cs/ sup 137/ and Sr/sup 90/ in cherry, the distribution of Sr/suo 90/ sprayed on bean plants in the reproductive tissues, the ...
The importance of atmospheric NH/sub 3/ as an agent for the transport and redistribution of nitrogen both within and among ecosystems has been vastly underestimated. Previous research has shown that both soil and water surfaces are significantly enriched with nitrogen arising from direct absorption of NH/sub 3/ from the air. Calculations indicate that annual NH/sub 3/ ...
Attenuated total reflectance (ATR) spectra of plant leaves display complex absorption features related to organic constituents of leaf surfaces. The spectra can be recorded rapidly, both in the field and in the laboratory, without special sample preparation. This paper explores sources of ATR spectral variation in leaves, including ...
Melatonin (N-acetyl-5-methoxytryptamine) is a highly conserved molecule whose presence is not exclusive to the animal kingdom. Indeed, numerous studies have demonstrated its presence in plants, where the possible role(s) of this indoleamine is (are) under active investigation. The present work aims to further our knowledge in this respect and presents the results of a study of the effect that ...
The effects of Cr and Fe, singly and in combination were investigated on nutrients uptake (Cu, Zn and Mn), lipid peroxidation, antioxidant enzymes, chlorophyll content and growth parameters in Zea mays L. var. Ruchi (SRHM 445). Roots of the Cr treated plants were stunted and root hair formation was greatly impaired. The leaves were bearing wilted appearance. Cr was primarily ...
We have investigated the accumulation of nickel in a hyperaccumulating plant from the Brassicacae family Leptoplax emarginata (Boiss.) O.E. Schulz. Two supplementary hyperaccumulating plants, which have been the subject of a high number of publications, Alyssum murale Waldst. & Kit and Thlaspi caerulescens J.&C. Presl, and a nonaccumulating species Aurinia saxatilis were also studied for ...
The inorganic constituents of 5 different plants (leaves and stalks) were investigated by using Fourier transformer infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermal analysis including thermal gravimetric analysis (TGA), derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC). These plants are Catha edulis (Khat), basil, mint, green tea ...
Nutrient-solution-grown pepper (Capsicum frutescens L. Early Calwonder) absorbed 62% of the diphenamid (N,N-dimethyl-2,2-diphenylacetamide) supplied via the roots for 48 h, and 74% in 150 h. Extensive translocation accompanied absorption, and 70 +/- 3% of the absorbed /sup 14/C was present in shoots of plants harvested after 24- to 150-h treatments. Diphenamid was metabolized ...
The bioavailability and chemical fate of xenobiotics in terrestrial plants can influence the impact of fossil fuel development on the human food chain. To determine the relative behavior of organic residues representing a range of chemical classes, we compared the rates of root absorption, tissue distribution and chemical fate of phenol, aniline and quinoline in soybean ...
A newly established fiber-optic fluorimetry was used to determine the fluoranthene (Fla) adsorbed on the leaf surfaces of three mangrove species, such as Excoecarla agallocha (Ea), Kandelia candel (Kc) and Aegiceras corniculatum (Ac). With the method, the photolysis of Fla adsorbed on Ea, Kc and Ac leaf surfaces was studied. Under the laboratory conditions, using a high pressure mercury lamp as ...
Real-time monitoring the variation of chlorophyll distributions and cellular structures in leaves during plant growth provides important information for understanding the physiological statuses of plants. Two-photon-excited autofluorescence imaging and second harmonic generation imaging of leaves can be used for monitoring the nature intrinsic fluorophores ...
In its natural habitat, Astragalus bisulcatus can accumulate up to 0.65% (w/w) selenium (Se) in its shoot dry weight. X-ray absorption spectroscopy has been used to examine the selenium biochemistry of A. bisulcatus. High concentrations of the nonprotein amino acid Se-methylseleno-cysteine (Cys) are present in young leaves of A. bisulcatus, but in more ...
To assess dermal absorption of nicotine from tobacco leaves in relation to Green Tobacco Sickness (GTS), urinary cotinine concentrations were measured in 80 male tobacco-growing farmers and in 40 healthy males (controls) who did not handle wet tobacco leaves in Kelantan, Malaysia. Among non-smokers, urinary cotinine levels in farmers ...
Background and AimsKaolin applied as a suspension to plant canopies forms a film on leaves that increases reflection and reduces absorption of light. Photosynthesis of individual leaves is decreased while the photosynthesis of the whole canopy remains unaffected or even increases. This may result from a better distribution of light ...
A simple and highly sensitive reagent of salicylaldehyde 3-oxobutanoylhydrazone (salicylaldehyde acetoacetic acid hydrazone, SAAH) was synthesized and studied for the spectrophotometric determination of nickel in detail. In the pH range 6, which greatly increased the selectivity, nickel reacted with SAAH to form a 1:1 yellow complex, having a sensitive absorption peak at 405 ...
This study was undertaken to provide an effective means of evaluating the deposition of aerosol particles, particularly those containing Pb, on vegetation in different ecosystems. Analysis and detection of aerosol particles deposited on the surface of pine needles utilized the following techniques: atomic absorption spectroscopy of deposits washed from ...
Data taken from the MCMA-2003 and the MILAGRO field campaigns are used to examine the absorption of solar radiation by the organic component of aerosols. Using irradiance data from an MFRSR and an actinic flux spectroradiometer, we find aerosol single scattering albedo (SSA) as a function of wavelength. We find that in near-UV spectral range (defined here as 250 nm to 400 ...
The food chain availability of technetium incorporated into plant tissue, its chemical form in corn leaves, and the potential for gastrointestinal absorption of plant-incorporated technetium was investigated. Technetium-95m was incorporated into corn leaves via root uptake. Chemical fractionation of the /sup 95m/Tc in ...
Imprisonment of resonant radiation in an expanding sphere on the basis of the numerical solution of the rate balance equation for excited atoms and the transfer resonance radiation equation is investigated. Calculations of the escape factor for sphere at Doppler form of absorption and scattering profiles are executed. The effect of spectral shift of the ...
A method is described for the determination of an organic tin insecticide, Vendex or hexakis(2-methyl-2-phenylpropyl)distannoxane (HMPD). Tin compounds are extracted from the sample homogenate with ethyl ether containing 1% acetic acid. HMPD and its degradation products are separated through a silica gel column, and analyzed by an atomic absorption spectrophotometer coupled ...
Aqueous extract of Bauhinia megalandra leaves was able to inhibit the intestinal glucose absorption in a concentration-dependent way and additive to phlorizine. Moreover, B. megalandra leaf extract drastically reduced the 14C-glucose uptake by enterocyte brush border membrane vesicles. The B. megalandra leaf extract administrated orally, simultaneously ...
Leaves of bhringaraj and guduchi herb of Kadapa district of Andhra Pradesh, India, are dried and powdered. ICP-MS analysis of samples indicates that copper is present in both the samples. An EPR study of guduchi sample also confirms the presence of Fe(III) whereas Eclipta alba confirms the presence of Fe(III), Mn(II) and Cu(II). Optical absorption spectrum ...
IT has been proposed that intense X-ray sources could also be candidates for ?-ray sources, but there has been no experimental evidence. This can mean either that no ? rays are produced or that they are absorbed before they leave the source. Under certain assumptions about the geometry of the X-ray source one can show that the ? rays are strongly absorbed as a result of pair ...
The above ground, or aerial, parts of plants were found to absorb radionuclides readily from external spray applications. Entry through leaves, stems, fruit, and bark were demonstrated. The rate of absorption, extent of subsequent transport, and pattern of distribution within the plant was found to be dependent upon the nature of the radionuclide ...
The absorption of fission products by the leaves of plants is studied. A representative range of agricultural and horticultural crops (wheat, potato, french bean, swede, sugar beet, and cabbags) were grown in pots or boxes. Replicated batches of plants were sprayed with strontium89 or cesium-137 at dferent stages of growth. When mature, the ...
