Nitrogen nutrition in cyanobacteria is regulated by NtcA, a transcriptional activator that is subject to negative control by ammonium. Using Synechococcus sp. strain WH7803 as a model organism, we show that ntcA expression was induced when cells were exposed to nitrogen stress but not when they were subjected to phosphorus or iron deprivation. Transcript levels accumulated in cells grown on a v...

The production efficiency and quality of tomatoes is affected by the mode irrigation nitrogen forms. This study explored impacts different regimes, forms, their coupled effects on tomato production. various regimes were set at 50%FC~90%FC (W1), 60%FC~90%FC (W2), 70%FC~90%FC (W3), 80%FC~90%FC (W4) Furthermore, control (CK) group followed a conventional drip regime in local area. Nitrogen forms t...

This paper considers the spatial and temporal variability in concentrations of the potentially acidifying ions in precipitation in Lithuania during the 1981-2004 period. Chemical analysis of precipitation included measurements of pH, conductivity, sulfate (SO4(2-)), nitrate (NO3-), chloride (Cl-), ammonium (NH4+), sodium (Na+), potassium (K+), and calcium (Ca2+). Temporal trends in the potentia...

The rapid growth in the use of electronic equipments, combined with early obsolescence has contributed enormously to the generation of large quantity of electronic (e) waste. One such e-waste, the mobile phone printed circuit boards (PCBs) contain various precious metals which can be extracted by different hydrometallurgical routes. The present work deals with the recovery of gold using ammoniu...

Nata de coco is a fermented product by Acetobacter xylium. The formation of nata requires source Carbon (C) and Nitrogen (N). nitrogen used in the production such as Urea or Ammonium Sulfate (ZA) causes some people to feel reluctant consume coco. One natural protein sources that have high content Moringa Leaf (Moringa oleifera). research aims determine appropriate concentration leaf extract obt...

Bacteriocins, including nisin, pediocin PO2, brevicin 286, and piscicolin 126, were extracted from fermentation media by adsorption onto Micro-Cel (a food-grade diatomite calcium silicate anticaking agent) and subsequent desorption. The optimal conditions for desorption of piscicolin 126 were determined and applied to other bacteriocins, and the relative purities of the desorbed preparations we...

Saccharomyces cerevisiae X2180-1A synthesizes two forms of asparaginase: L-asparaginase I, an internal constitutive enzyme, and asparaginase II, an external enzyme which is secreted in response to nitrogen starvation. The two enzymes are biochemically and genetically distinct. The structural gene for asparaginase I (asp 1) is closely linked to the trp 4 gene on chromosome IV. The gene controlli...

The conversion of 3,5-cyclohexadiene-1 J-diol-l-carboxylic acid (DHB) to catechol has been shown to be catalyzed by a single protein from the bacterium Alcaligenes eutrophus. The enzyme was purified by ultracentrifugation, ammonium sulfate fractionation, DEAE-cellulose chromatography and Sephadex G-ZOO gel filtration. Its molecular weight is approximately 94,600 (by sedimentation equilibrium) a...

The use of sodium sulfate instead of ammonium sulfate in the precipitation of globulins makes it possible to determine the proteins of plasma or serum in small quantities of ‘blood. The basis for the selection of sodium sulfate has been discussed in the preceding paper (1). Robertson (2) described a procedure for the determination of blood proteins in small quantities of blood with the aid of t...

The ammonium assimilatory enzymes glutamine synthetase (EC 6.3.1.2) and glutamate dehydrogenase (EC 1.4.1.3) were investigated for a possible role in the regulation of asparaginase (EC 3.5.1.1) in a Chlamydomonas species isolated from a marine environment. Cells grown under nitrogen limitation (0.1 millimolar NH(4) (+), NO(3) (-), or l-asparagine) possessed 6 times the asparaginase activity and...