The measurement of lung volume by an opencircuit method (1, 2) is usually based on the redistribution of nitrogen contained in the lungs in such a manner that most of this gas is expelled and measured. Physically, this principle requires only the collection of the exhaled nitrogen in some diluent such as oxygen and the measurement of total volume and nitrogen concentration; the quantity of nitr...

The objectives of this study were to determine the effect of light enhancement and hastened reproductive development on nitrogen and dry matter accumulation by field-grown soybean (Glycine max [L.] Merr.). The impacts of photosynthate supply and reproductive development on change in the season-long profiles of in vivo leaf nitrate reductase (NR) activity and root nodule acetylene reduction (AR)...

in the present study, the root vigor and kinetic characteristics of nitrogen absorption in potato cultivars was investigated through sand cultivation and pot tests with nutrient solution. four cultivars of potatoes, namely, feiwuruita, yunshu301, liangshu97, and chuanyu56 were grown in nutrient solution matrix cultures. the result showed that: (1) nitrogen uptake rates differed significantly am...

Nitrate and ammonium removal from purified swine wastewater using biogas and air was investigated in continuous reactor operation. A novel type of reactor, a semi-partitioned reactor (SPR), which enables a biological reaction using methane and oxygen in the water phase and discharges these unused gases separately, was operated with a varying gas supply rate. Successful removal of NO(3)(-) and N...

The catchment management of reservoirs for drinking water supply not only requires knowledge about the nitrogen discharge of every agricultural field. In order to recommend changes in land use management it is much more important to evaluate its influence to the nitrogen concentration in the reservoir. In order to achieve this the influence of processes that take place during transport must be ...

Nitrogen availability is a major factor determining plant growth and productivity. Plants acquire nitrogen nutrients from the soil through their roots mostly in the form of ammonium and nitrate. Since these nutrients are scarce in natural soils, plants have evolved adaptive responses to cope with the environment. One of the most important responses is the regulation of nitrogen acquisition effi...

N deficiency caused a decrease in leaf content, Chlorophyll and carbon assimilation of crop plants, resulting lower dry matter accumulation. It increases overall plant growth, but the nature this response depends upon patterns plant, nitrogen allocation, nutrient that vary throughout growing season depend canopy position. Decreased photosynthetic capacity is not only associated with direct effe...

In three cases of intestinal infantilism, the excretion of nitrogen in the urine per square meter of body surface was low. The heat radiation was normal. In spite of the fact that the absolute quantity of nitrogen was low, the distribution of nitrogen and sulphur among the various nitrogen and sulphur constituents of the urine was in the normal ratio. The ammonia excretion was normal. The ether...

Abstract This paper introduces the working principle and system work flow of marine nitrogen generator. Emphasis is laid on air pretreatment subsystem, membrane separation subsystem automatic control In view alarm shutdown fault a ship’s generator in course operation, reason analyzed, it found that refrigeration device leads to excessive temperature before film inlet group, thus causing failure...