A天空为什么是蓝色的?The air we breathe is mostly nitrogen(氮气)and oxygen, two gases that have no colour. So why does the sky look so blue, a colour that gives people a feeling of peace?Lord Rayleigh, a scientist in England, realized that the nitrogen and oxygen molecules(分子)are the ...
at night when at nitrogen atmospher at once immediately at one fling at one s at ones fingersr tips at ones wits end not at ones height at other firms at our peril at phosphoribosyl pyr at proper temperature at qualifying at restaurants at roller gap at sixes or sevens at smith school at...
Second, as far as we know, there are no reservoirs of water on Venus’ surface, and the planet’s atmosphere, made up mostly of carbon dioxide, nitrogen, and sulfuric acid, contains hardly any oxygen or water vapor. Water and oxygen would therefore probably have to be supplied to Venus f...
Nitrogen Uses and Properties - Nitrogen is a diatomic gas with atomic number 7 and symbol N. Know the nitrogen atomic number, the atomic mass of nitrogen and atomic weight of nitrogen. Explore the Uses of Nitrogen.
All tissue samples were immediately placed into enzyme-free centrifuge tubes, which were immersed in liquid nitrogen and stored at − 80 °C until further use. RNA extraction, library construction and Illumina sequencing Total RNA was extracted from each frozen tissue using TRIzol reagent (...
The rhizobia bacteria fix N from air that’s in the soil and the legume gains benefit from the fixed N. In turn, the legume provides carbohydrates and sugars from photosynthesis to the rhizobia. Each organism gains necessary nutrients from the association. Nitrogen fixation directly promotes legume...
In a healthy adult, the endogenous microbially produced gut gases (hydrogen, methane, and insignificant quantities of odorogenic sulfides and ammonia) are only a minor amount as opposed to bulk of gases, predominantly oxygen, nitrogen, and carbon dioxide, generated every day from exogenous air ...
biofilm-related genes in plasmids is probably higher than those in chromosomes, our results highlight the important role of plasmids in carrying niche-specific traits, and that biofilm plasmids are more diverse than previously expected. Moreover, the presence of nitrogen respiration genes in biofilm ...
There are three main emissions produced by car engines: nitrogen gas (N2), carbon dioxide (CO2) and water vapour (H2O). The catalytic converter however is mostly used to tackle the smaller, more-harmful products that are produced due to the naturally-imperfect combustion process of the IC eng...
Leaf tissues were then ground into fine powder in liquid nitrogen. 200 mg of ground tissue were extracted twice with 500 μL of DCM containing 1 μg naphthalene (internal standard), concentrated to about 200 μL and subjected to GC–MS analysis. To release benzylalcohol from its ...