نتایج جستجو برای: methylamines
تعداد نتایج: 112 فیلتر نتایج به سال:
Abietadiene synthase (AS) catalyzes the complex cyclization-rearrangement of (E,E,E)-geranylgeranyl diphosphate (8, GGPP) to a mixture of abietadiene (1a), double bond isomers 2a-4a and pimaradienes 5a-7a as a key step in the biosynthesis of the abietane resin acid constituents (1b-4b) of conifer oleoresin. The reaction proceeds at two active sites by way of the intermediate, copalyl diphosphat...
Marine microorganisms that consume one-carbon (C(1)) compounds are poorly described, despite their impact on global climate via an influence on aquatic and atmospheric chemistry. This study investigated marine bacterial communities involved in the metabolism of C(1) compounds. These communities were of relevance to surface seawater and atmospheric chemistry in the context of a bloom that was do...
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Jason Treberg discusses the impact of Paul Yancey et al.'s classic paper 'Living with water stress: evolution of osmolyte systems', published in Science in 1982. Occasionally a hypothesis comes along that is so broadly applicable to biological systems that it borders on being universal. Even less frequent is when the hypothesis involves linking knowledge from almost a century before with recent...
Two methods based on ion chromatography (IC) were developed for the detection of methyl and ethyl alkyl amines (methylamine (MA), ethylamine (EA), dimethylamine (DMA), diethylamine (DEA), trimethylamine (TMA) and triethylamine (TEA)) and NH(3)/NH(4)(+) in online atmospheric gas-particle and size-resolved particulate samples. The two IC methods were developed to analyze samples collected with an...
in the homeostatic control of body fluid and ionic balance. In terrestrial mammals, a 1–2 % deficit in cellular fluid volume is sufficient to induce a powerful drinking response, whereas 8–10 % of extracellular fluid loss is required to induce dipsogenesis (Fitzsimons, 1998). As a consequence, an increase in plasma osmolality, or hyperosmoraemia, acts as a more acute trigger for drinking in mam...
BACKGROUND & AIMS Probiotics can reduce symptoms of irritable bowel syndrome (IBS), but little is known about their effects on psychiatric comorbidities. We performed a prospective study to evaluate the effects of Bifidobacterium longum NCC3001 (BL) on anxiety and depression in patients with IBS. METHODS We performed a randomized, double-blind, placebo-controlled study of 44 adults with IBS a...
The structure and function of the microbiome inhabiting the rumen are, amongst other factors, mainly shaped by the animal's feed intake. Describing the influence of different diets on the inherent community arrangement and associated metabolic activities of the most active ruminal fractions (bacteria and archaea) is of great interest for animal nutrition, biotechnology, and climatology. Samples...
Cells are enclosed by a membrane that is readily penetrated by water but does not allow free diffusion of most solutes. Consequently, changes in external osmolality result in osmotic stress because of unequal rates of movement of water and solutes across the cell membrane. Cells respond to osmotic stress by osmoregulation, i.e., regulatory compensation of changes in cell volume, water content, ...
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