نتایج جستجو برای: fixed carbon
تعداد نتایج: 475910 فیلتر نتایج به سال:
1. Mice were continuously exposed to air containing C(14)O(2). The specific radioactivities of urea carbon, total fecal carbon, and numerous components of tissue carbon were compared as a function of the duration of exposure with the radioactivity of the air CO(2). 2. The data indicate that the total CO(2) fixed from the air is proportional to its concentration in the air. 3. When the CO(2) con...
In situ capping of polychlorinated biphenyl (PCB)-contaminated sediments with a layer of activated carbon has been proposed, but several questions remain regarding the long-term effectiveness of this remediation strategy. Here, we assess the degree to which kinetic limitations, size exclusion effects, and electrostatic repulsions impaired PCB sorption to activated carbon. Sorption of 11 PCB con...
Conventional steam activation pyrolysis of waste materials such as oil palm kernel shell for production of biochar was investigated using central composite design. Conventional steam activation was carried out via an initial carbonization of oil palm kernel shell to obtain biochar and thereafter steam activation of the biochar using the conventional heating to produce activated carbon. Addition...
Basidiocarps of Trametes versicolor with an epiphytic flora (including Trebouxia sp.) collected from north-central Rhode Island were incubated in an atmosphere of C labeled CO2 for 6 hours. Using autoradiography, the location of the fixed CO2 was determined at 6h, 12h, 24h, 48h, 96h, and 192h. The fixed C was recorded in the epiphytic algae after 6h, and at all subsequent times. After 192h the ...
Isoprene emission from leaves is dynamically coupled to photosynthesis through the use of primary and recent photosynthate in the chloroplast. However, natural abundance carbon isotope composition (delta(13)C) measurements in myrtle (Myrtus communis), buckthorn (Rhamnus alaternus), and velvet bean (Mucuna pruriens) showed that only 72% to 91% of the variations in the delta(13)C values of fixed ...
In model terrestrial ecosystems maintained for three plant generations at elevated concentrations of atmospheric carbon dioxide, increases in photosynthetically fixed carbon were allocated below ground, raising concentrations of dissolved organic carbon in soil. These effects were then transmitted up the decomposer food chain. Soil microbial biomass was unaffected, but the composition of soil f...
the quantitative performance of wheat crop under 1-5 year old poplar plantations in irrigated agro-ecosystem was studied to ascertain the biological yield of tree and crop. results revealed that growth and yield of wheat decreased significantly with the increase in poplar age. the per cent reduction in net grain yield was 17% under one year old poplar plantation, which increased to 52.15% under...
one of the applications of nanotechnology is use of carbon nanotubes for the targeted delivery of drug molecules. to demonstrate the physical and chemical properties of biomolecules and identify new material of drug properties, the interaction of carbon nanotubes (cnts) with biomolecules is a subject of many investigations. cnts is a synthetic compound with extraordinary mechanical, thermal, el...
Crassulacean acid metabolism (CAM) plants exhibit a complex interplay between CO(2) fixation by phosphoenolpyruvate carboxylase (PEPC) and ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco), and carbon demand for CAM maintenance and growth. This study investigated the flux of carbon from PEPC and direct Rubisco fixation to different leaf carbon pools and to phloem sap over the diurnal cy...
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