Abstract--A model is developed for a highly eutrophic lake (White Lake, Michigan) which incorporates both the water and sediment systems and considers two forms of phosphorus--particulate and dissolved. Dynamic interactions of phosphorus between sediments and water are quantified by taking account particulate phosphorus sinking to the sediment-water interface and diffusion of dissolved phosphor...

The objective of this study was to investigate the impact of sediment resuspension and phosphorus (P) release on phytoplankton growth under different kinds of wind-wave disturbance conditions in the large and shallow eutrophic Lake Taihu in China. Short-term strong wind (STSW) conditions, long-term moderate wind (LTMW) conditions, and static/calm conditions were investigated. To address this ob...

background & aims of the study: in this research, long-term hydrologic impact assessment model is selected for simulation of runoff and nps pollution. the aim of this study is modeling of non-point source pollution by l-thia model in zayandehrood watershed in 2015. materials & methods: in this study, analytical survey and investigation of references in the context of library studies has been us...

The behaviour of acid-soluble DNA precursors in synchronized and asynchronously growing yeast after X-irradiation is investigated by labeling techniques with 32P; and by enzymic estimation. In prelabeled synchronized growing cells, radioactivity associated with deoxynucleoside triphos­ phates increases to maximum values shortly before each DNA replication, followed by a drastic decrease during ...

Isolated mouse liver mitochondria were incubated in two types of P(32)-labelled sucrose-phosphate buffers. The first contained no added ATP or oxidizable substrate. The second contained added ATP. Samples were taken at specified times, up to 60 minutes, and analyses were made of the mitochondrial TCA-soluble inorganic P(32) and the total mitochondrial residue P(31) and P(32). The results of the...

SHERMAN and PAPPENHEIMER [1921] and later, Pappenheimer, McCann, Zucker and Hess [1921] induced the development of severe experimental rickets in rats by a diet (No. 84) consisting of 95 % patent flour and 5 % salt mixture. This diet was not only deficient in phosphorus and fat-soluble A, but was also very obviously deficient in many other respects. McCollum, Simmonds, Shipley and Park [1921], ...

Abstraet--A budget model is developed to predict the long-term response of a lake to changes in its phosphorus loading. This model computes total phosphorus and hypolimnetic oxygen concentrations, taking sediment-water interactions into account. The lake is treated as two segments: the water and a surface sediment layer. A total phosphorus budget for the water accounts for inputs due to externa...

Currently, there is an urgent need for domestic fermentation activators based on low-cost secondary raw materials. We aimed to study the effect of microbial enzyme preparations with different action hydrolysis proteins and phytin grain bran obtain that could become alternative imported ones.
 studied wheat rye brans; cytolytic, proteolytic, phytase action; multi-enzyme compositions; hydrol...

The phosphorus equilibration pattern and rate bctwecn mud and water was the same in natural Jcnkin sampler cores, in artificial cores, and in bottles in which dredged surface mud was packed by centrifuge. Thus any specific natural physico-chemical or bacteriological layering of the surface muds of lakes is relatively unimportant in phosphorus exchange, Phytoplankton or bacterial cells equilibra...