Topic
Urea
About: Urea is a research topic. Over the lifetime, 21394 publications have been published within this topic receiving 382444 citations. The topic is also known as: carbamide & carbonic acid diamide.
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TL;DR: Urea transport in Saccharomyces cerevisiae occurs by two pathways and the first mode of uptake which occurs at external urea concentrations in excess of 0.5 mM is via either passive or facilitated diffusion.
Abstract: Urea transport in Saccharomyces cerevisiae occurs by two pathways. The first mode of uptake is via an active transport system which: (i) has an apparent Km value of 14 muM, (ii) is absolutely dependent upon energy metabolism, (iii) requires pre-growth of the cultures in the presence of oxaluric acid, gratuitous inducer of the allantoin degradative enzymes, and (iv) is sensitive to nitrogen repression. The second mode of uptake which occurs at external urea concentrations in excess of 0.5 mM is via either passive or facilitated diffusion.
91 citations
91 citations
TL;DR: In this paper, a slow-release urea (S-urea) was produced using a new method; a bentonite and organic polymer (OP) were used to form a three-dimensional lattice structure by melting urea directly.
91 citations
91 citations
TL;DR: In most mammals, ability to concentrate urea in the urine exceeds that for electrolytes; this was not found in beaver, pig, and the desert rodent Psammomys.
Abstract: In most mammals, ability to concentrate urea in the urine exceeds that for electrolytes; this was not found in beaver, pig, and the desert rodent Psammomys. When these animals were exposed to water...
90 citations