搜索结果: 1-15 共查到“理学 turnover”相关记录23条 . 查询时间(0.14 秒)
Keeping the human brain in a healthy state requires a delicate balance between the generation of new cellular material and the destruction of old. Specialized structures known as lysosomes, found in n...
Increased temperature and precipitation interact to affect root production, mortality, and turnover in a temperate steppe: implications for ecosystem C cycling
precipitation root mortality root production root turnover temperate grassland warming
2015/2/5
Fine root production and turnover play important roles in regulating carbon (C) cycling in terrestrial ecosystems. In order to examine effects of climate change on root production and turnover, a fiel...
Effect of initiating enteral protein feeding on whole-body protein turnover in critically ill patients
critical illness nutritional support stable isotope tracers whole-body protein turnover intrinsically isotope-labeled casein
2018/12/24
Background:Critically ill patients are susceptible to protein catabolism. Enteral feeding may ameliorate protein loss, but its effect is not well characterized in terms of protein kinetics.
Microtubule organization, movement and turnover in motile and non-motile cells
Biological sciences Microtubule Photoactivation Fluorescence Cell motility
2015/1/28
Microtubules are required for several cellular processes including vesicle transport, cytoplasmic organization, cell motility, maintenance of cellular polarity, and mitosis. The mechanisms by which mi...
Nitric oxide turnover in permeable river sediment
Nitric oxide turnover permeable river sediment
2014/7/10
We measured nitric oxide (NO) microprofiles in relation to oxygen (O2) and all major dissolved N-species (ammonium, nitrate, nitrite, and nitrous oxide [N2O]) in a permeable, freshwater sediment (Rive...
Quantitative Interpretation of the Randomness in Single Enzyme Turnover Times
Quantitative Interpretation Randomness Single Enzyme Turnover Times
2014/9/24
Fluctuating turnover times of a single enzyme become observable with the advent of modern cutting-edge, single enzyme experimental techniques. Although the conventional chemical kinetics and its moder...
Mammary Cell Turnover under High Temperature during the Dry Period in Dairy Cows
High Temperature Dry Period Cell Cycle Apoptosis Proliferation Dairy Cow
2016/5/6
The influence of high temperature on mammary cell turnover during the dry period is still unclear. The objective of this study was to investigate mammary cell turnover and p53 protein expression in th...
Effects of seasonality and resource limitation on organic matter turnover by Chironomidae (Diptera) in southern Appalachian headwater streams
seasonality resource limitation Chironomidae in southern Appalachian headwater streams
2014/4/17
Despite their high abundance, secondary production, and known reliance on detrital material, the role of chironomids (Diptera) in fine particulate organic matter (FPOM) dynamics has not been well quan...
Are common species sufficient in describing turnover in aquatic metacommunities along environmental and spatial gradients?
ommon species describing turnover
2014/4/17
Recent findings have suggested that large-scale diversity patterns are primarily driven by widespread species,
while rare species are less important in this regard. The degree to which variation in t...
Temporal variations in microbial activities and carbon turnover in subtidal sandy sediments
Temporal variations microbial activities carbon turnover subtidal sandy sediments
2010/1/20
Temporal dynamics and vertical patterns in bacterial abundances and activities were studied in a shallow subtidal sand flat in the Sylt-Rømø Basin (North Frisian Wadden Sea, Germany). Ex...
Phosphatase activity and organic phosphorus turnover on a high Arctic glacier
Phosphatase activity organic phosphorus high Arctic glacier
2010/1/20
Arctic glacier surfaces harbour abundant microbial communities consisting mainly of heterotrophic and photoautotrophic bacteria. The microbes must cope with low concentrations of nutrients and with th...
Long-term modelling of nitrogen turnover and critical loads in a forested catchment using the INCA model
forest ecosystem N saturation critical load modelling
2009/3/17
Many forest ecosystems in Central Europe have reached the status of N saturation due to chronically high N deposition. In consequence, the NO3 leaching into ground- and surface waters is often substan...
Centennial black carbon turnover observed in a Russian steppe soil
Centennial black carbon turnover Russian steppe soil
2010/1/18
Black carbon (BC), from incomplete combustion of fuels and biomass, has been considered highly recalcitrant and a substantial sink for carbon dioxide. Recent studies have shown that BC can be degraded...
Ballast, sinking velocity, and apparent diffusivity within marine snow and zooplankton fecal pellets: Implications for substrate turnover by attached bacteria
Ballas sinking velocity apparent diffusivity
2014/4/21
We analyzed size-specific dry mass, sinking velocity, and apparent diffusivity in field-sampled marine snow,
laboratory-made aggregates formed by diatoms or coccolithophorids, and small and large zoo...
Long-term steady state 13C labelling to investigate soil carbon turnover in grasslands
Long-term steady state 13C soil carbon turnover grasslands
2010/1/14
We have set up a facility allowing steady state 13CO2 labeling of short stature vegetation (12 m2) for several years. 13C labelling is obtained by scrubbing the CO2 from outdoors air with a self-regen...