Chemical composition of water and dissolved organic carbon (DOC) levels were investigated over three years, along two large rivers in NE Poland, with different hydrological regimes. One river was from lakeland and the second a typical lowland river with forests and high contributions of peatlands in the catchment. The study involved hydrological (specific runoff, river discharge) effects on the...

Enzymatic oxidation of 3,4-dihydroxyphenyl-L-alanine (L-DOPA) with laccase from Trametes versicolor was investigated. The highest enzyme activity at pH 5.4 and at 25 °C was found. The reaction kinetics and the effect of dissolved oxygen concentration on the reaction rate were evaluated. A mathematical model, comprised of double-substrate Michaelis-Menten kinetics and mass balances for L-DOPA an...

The distributions of water quality parameters viz. temp, salinity, dissolved oxygen (DO), biochemical oxygen demand (BOD), total suspended substances (TSS), nutrients [NO -N, NO -N, NH -N, PO -P, SiO -Si, 2 3 4 4 4 total nitrogen (TN), total phosphorous (TP)] and Chlorophyll-a (Chl-a) were studied in the Mahanadi river and costal environment of Paradip in two different seasons i.e. post-monsoon...

In this paper we report the regulation of Aspergillus niger growth rate during citric acid fermentation in a stirred tank bioreactor. For this, the influence of dissolved oxygen concentration in a medium on intracellular pH values and consequently on overall microbial metabolism was emphasized. Intracellular pH of mycelium grown under different concentrations of dissolved oxygen in the medium w...

Corrosive esophagitis is characterized by caustic injury due to the ingestion of chemical agents, mainly alkaline substances such as detergents. Esophageal bleeding, perforation, or stricture can be worsened by high-degree corrosive esophagitis. Picosulfate is a commonly used laxative frequently administered for bowel preparation before colonoscopy or colon surgery. Picosulfate powder should be...

Iron (Fe) is an essential micronutrient for marine organisms, and it is now well established that low Fe availability controls phytoplankton productivity, community structure, and ecosystem functioning in vast regions of the global ocean. The biogeochemical cycle of Fe involves complex interactions between lithogenic inputs (atmospheric, continental, or hydrothermal), dissolution, precipitation...

THERE is no doubt that therapeutic levels of penicillin can be obtained in the aqueous and the tissues of the anterior segment of the globe, by injecting correct doses of the antibiotic subconjunctivally. Such levels are slightly higher than those reached with equal doses by systemic administration (Sorsby and Ungar, 1946-48; Andrews, 1947). The degree of impurity shown by the first preparation...