搜索结果: 196-210 共查到“理学 oxygen”相关记录231条 . 查询时间(0.093 秒)
Effect of the brittle star Amphiura filiformis (Amphiuridae, Echinodermata) on oxygen flux into the sediment
brittle star Amphiura filiformis oxygen flux sediment
2014/5/21
O2 plays a key role in early sedimentary diagenetic processes, but the effect of most macrofaunal species on the pathways and rates of supply of O2 into the seabed are not well known. We investigated ...
Meristematic oxygen variability in eelgrass (Zostera marina)
Meristematic oxygen variability eelgrass
2014/5/20
We examined the variability in oxygen content of meristematic tissues in eelgrass in order to evaluate its potential
role in events of sudden mass mortality within eelgrass beds. Oxygen content withi...
Why the phosphorus retention of lakes does not necessarily depend on the oxygen supply to their sediment surface
phosphorus retention of lakes oxygen supply sediment surface
2014/5/20
In order to improve the trophic state of Lake Sempach, a eutrophied lake in central Switzerland, its external phosphorus (P) load has been decreased and its hypolimnion has been artificially oxygenate...
Community Structure of Macrobenthos of a Southeast Texas Sand-Pit Lake Related to Water Temperature, pH and Dissolved Oxygen Concentration
macrobenthos sand-pit lake temperature dissolved oxygen and community structure
2010/3/30
Water temperature (°C), pH, dissolved oxygen concentration (mg/l) and the community structure of the macrobenthos of a small southeast Texas sand-pit (Barry's) lake were studied from June 1995 to Febr...
The role of small-scale sediment topography for oxygen flux across the diffusive boundary layer
The role of small-scale sediment topography oxygen flux across diffusive boundary layer
2014/5/27
At the scale of centimeters or millimeters, marine sediment surfaces are sculptured into complex three-dimensional landscapes. A detailed study of fluxes through the diffusive boundary layer (DBL) the...
The influence of ammonium, nitrate, and dissolved oxygen concentrations on uptake, nitrification, and denitrification rates associated with prairie stream substrata
ammonium nitrate dissolved oxygen concentrations uptake nitrification denitrification rates prairie stream substrata
2014/5/26
Substrata samples were collected from Kings Creek on Konza Prairie Biological Station (Manhattan, Kansas) and incubated with varying levels of ammonium (NH4+), nitrate (NO3-), and dissolved oxygen (O2...
Oxygen transfer across the air-water interface by natural convection in lakes
Oxygen transfer air-water interface natural convection lakes
2014/5/26
Oxygen transfer associated with natural convection in lakes and reservoirs was examined in a series of laboratory experiments. A thin, cool surface water layer (2-3 mm in thickness) was formed by chil...
Evaluation of community respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret
community respiratory mechanisms oxygen isotopes Lake Kinneret
2014/5/26
Gross and net O2 production between May 1996 and February 1999 was determined in bottle incubation experiments with H218O spike and from the change in O2 concentration. Carbon fixation rates were obta...
Induction of Changes in Morphology, Reactive Nitrogen/Oxygen Intermediates and Apoptosis of Duck Macrophages by Aflatoxin B1
Aflatoxin B1 Apoptosis Reactive Nitrogen/Oxygen Intermediates Macrophages
2016/4/12
The purpose of this study was to investigate the effects of aflatoxin B1 (AFB1) on the ultracellular morphology alteration, apoptosis induction and reactive nitrogen and oxygen intermediates productio...
The oxygen isotopic composition of seawater during the Last Glacial Maximum
The oxygen isotopic composition of seawater the Last Glacial Maximum
2014/4/9
High-resolution oxygen and hydrogen isotope measurements were made on pore fluids from deep-sea sediments from sites in the North and South Atlantic. The data provide direct measurements of changes in...
Effect of the Oxygen/Halogen Ratio on the Physical Properties of Some Sodium-Boro-Vanadate Glasses
Physical Properties of glass Glass containing halogen ions Glass structure
2010/4/13
Four different glass systems of the sodium boro-vanadate type containing halogen ions, were prepared by melting at 1000°C for three hours and annealed at 300°C. These glasses were investigated using d...
Small-scale oxygen fluxes and remineralization in sinking aggregates
Small-scale oxygen fluxes remineralization sinking aggregates
2014/6/10
Sinking aggregates are the major component of the vertical particulate flux in most regions of the ocean. Controlling factors for aggregate remineralization rates and solute exchange with the surround...
Heterotrophic bacterial utilization of nitrogenous and nonnitrogenous substrates, determined from ammonia and oxygen fluxes
Heterotrophic bacterial utilization nitrogenous non nitrogenous substrates ammonia and oxygen fluxes
2014/6/10
We describe a simple procedure to allow the broad nature of the organic substrates used for planktonic bacterial growth to be determined. The method analyzes the coupled oxygen and ammonia fluxes in t...
Role of the oxygen-deficient zone in transfer of organic carbon to the deep ocean
the oxygen-deficientzone in transfer organic carbon the deep ocean
2014/6/10
Benthic carbon oxidation rates and carbon burial rates have been determined for two contrasting continental margins and their sum has been used as an estimate of carbon rain rate to the sediments. On ...
Langmuir circulations disturb the low-oxygen refuge of phantom midge larvae
Langmuir circulations disturb the low-oxygen refuge phantom midge larvae
2014/6/9
The previously unknown effects of wind-induced Langmuir circulations on the distribution of phantom midge larvae (Chaoborus flavicans) were studied by echosounding. The study was carri...