نتایج جستجو برای: nutrient proteins
تعداد نتایج: 619566 فیلتر نتایج به سال:
Vitamin A deficiency is widely prevalent amongst children in India. The present work was designed to be an intervention study with nutrient fortified biscuits to ameliorate the micronutrient status of adolescent girls coming from a low socio-economic background. Baseline data on serum total proteins and vitamin A levels of 111 adolescent girls (10-15 years) studying in a government school in Ja...
A general strategy for the expression of bacterial membrane transport and receptor genes in Escherichia coli is described. Expression is amplified so that the encoded proteins comprise 5-35% of E. coli inner membrane protein. Depending upon their topology, proteins are produced with RGSH6 or a Strep tag at the C-terminus. These enable purification in mg quantities for crystallization and NMR st...
By differential hybridization, we identified a number of genes in Saccharomyces cerevisiae that are activated by addition of cyclic AMP (cAMP) to cAMP-depleted cells. A majority, but not all, of these genes encode ribosomal proteins. While expression of these genes is also induced by addition of the appropriate nutrient to cells starved for a nitrogen source or for a sulfur source, the pathway ...
Expression in Escherichia coli of the genes that encode the major outer membrane porin proteins (OmpF and OmpC) is regulated by the transcription activator protein OmpR and the receptorlike protein EnvZ, which is located in the inner membrane. Using synthesized oligonucleotide fragments containing the OmpR-binding site of ompF, we show that soluble extracts and partially purified OmpR derived f...
OBJECTIVE To compare specific nutrient intake between normospermic and oligoasthenoteratospermic patients attending infertility clinics in two Mediterranean provinces of Spain. DESIGN Case-control study. SETTING Private fertility clinics in southeastern Spain. PATIENT(S) Thirty men with poor semen quality (case subjects) and 31 normospermic control subjects of couples attending our fertil...
Many microorganisms rely on binding-protein (BP) assisted, active transport systems for scavenging of scarce nutrients. Several hypotheses have been raised to explain the advantage of such uptake systems; attempting to rationalise the benefits of the relatively high BP concentrations in the periplasm and the coupling of transport to free energy transduction. Despite the appeal of these hypothes...
The diversity and composition of ecological communities often co-vary with ecosystem productivity. However, the relative importance of productivity, or resource abundance, versus the spatial distribution of resources in shaping those ecological patterns is not well understood, particularly for the bacterial communities that underlie most important ecosystem functions. Increasing ecosystem produ...
Nutrient cycling is a ubiquitous feature of ecosystems at all scales, allowing productivity to rise beyond the limits set by external nutrient inputs. Nutrient cycling occurs as a side-effect of the metabolism of a diverse set of species that each performs a step in the recycling loop. Recycling loops can be large and involve many steps. At each step the possibility exists for ‘side-reactions’ ...
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