نتایج جستجو برای: pyruvates
تعداد نتایج: 6535 فیلتر نتایج به سال:
Dynamic nuclear polarization at 1.2 K and 6.7 T allows one to achieve spin temperatures on the order of a few millikelvin, so that the high-temperature approximation (ΔE<kT) is violated for the nuclear Zeeman interaction ΔE=γB0h/(2π) of most isotopes. Provided that, after rapid dissolution and transfer to an NMR or MRI system, the hyperpolarized molecules contain at least two nuclear spins I an...
Bacterial histidine kinase/response regulator systems operate at the interface between environmental cues and physiological states. Escherichia coli contains two LytS/LytTR-type histidine kinase/response regulator systems, BtsS/BtsR (formerly YehU/YehT) and YpdA/YpdB, which have been identified as pyruvate-responsive two-component systems. Since they exhibit remarkable similarity, we analyzed t...
The proportion of pyruvate dehydrogenase in its active form is doubled in rat liver within 5 min of addition of vasopressin to the perfusing medium.
The effects of the addition of catalase (EC 1.11.1.6) or pyruvate on the enumeration of Staphylococcus aureus in Trypticase soy broth with 10% NaCl were examined using a most-probable-number technique. Addition of catalase or pyruvate to the broth increased enumeration of all heat-stressed S. aureus strains tested. Increases were also observed with nonstressed cells. Catalase and pyruvate were ...
The lipoic acid residues covalently bound to the transacetylase component of the pyruvate dehydrogenase multienzyme complex of Escherichia coli were selectively modified by reaction with 4-maleimido-2,2,6,6-tetramethylpiperidino-oxyl. The electron-spin-resonance spectrum of the spin-labelled enzyme indicates that the bound nitroxide groups have high mobilities relative to the protein molecule. ...
2,3-Dihydroxybutane, a compound not observed in normal urines, was identified in the urine of two patients by combined gas chromatography-mass spectrometry. It is suggested, that this 2,3-dihydroxybutane is derived from pyruvate by bacterial metabolism.
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