Treatment of [{Ti(η5-C5Me5)(μ-NH)}3(μ3-N)] (1) with one equivalent of [Ni(cod)2] (cod = 1,5-cyclooctadiene) in toluene at 60–80 °C and subsequent addition of diphenylacetylene, trans-stilbene or triphenylphosphane afforded the nickel(0) complexes [LNi{(μ3-NH)3Ti3(η5-C5Me5)3(μ3-N)}] (L = PhCCPh (2), PhCH≡CHPh (3), PPh3 (4)). The nickel(II) complex [I2Ni{(μ3-NH)3Ti3(η5-C5Me5)3(μ3-N)}] (5) was pre...

The effect of exogenous NH(4) (+) on NO(3) (-) uptake and in vivo NO(3) (-) reductase activity (NRA) in roots of Phaseolus vulgaris L. cv Witte Krombek was studied before, during, and after the apparent induction of root NRA and NO(3) (-) uptake. Pretreatment with NH(4)Cl (0.15-50 millimolar) affected neither the time pattern nor the steady state rate of NO(3) (-) uptake.When NH(4) (+) was give...

Ammonia (NH(3)) is a common exogenous gas in the atmosphere, as well as an endogenous chemical produced by amino acid catabolism and other pathways in vivo. Physiological and pathophysiological roles of NH(3) in the nervous system have been studied. Recently, endogenous NH(3) has been suggested to be a gas transmitter. However, so far the role of NH(3) in cardiovascular functions has not been r...

In an attempt to understand the process mediating K(+) transport into roots, we examined the contribution of the NH(4)(+)-sensitive and NH(4)(+)-insensitive components of Rb(+) transport to the uptake of Rb(+) in barley (Hordeum vulgare L.) plants grown in different ionic environments. We found that at low external Rb(+) concentrations, an NH(4)(+)-sensitive component dominates Rb(+) uptake in ...

Nghiên c?u s? d?ng ph??ng pháp mô t? c?t ngang trên 100 ch?ng vi khu?n Enterobacteriaceae phân l?p ???c ? b?nh nhân nhi?m huy?t t?i B?nh vi?n ?a khoa t?nh Thái Bình n?m 2018 - 2019. M?c tiêu: Xác ??nh t? l? các loài gây và ?ánh giá tình tr?ng kháng sinh c?a m?t s? ???c. K?t qu?: E. coli chi?m cao nh?t v?i 66% sau ?ó là Klebsiella pneumoniae 19%. ?ã ?? nhi?u lo?i nh? Amoxicillin/Clavulanicacid, ...

Normal human colonic luminal (NH(4)(+)) concentration ([NH(4)(+)]) ranges from approximately 10 to 100 mM. However, the nature of the effects of NH(4)(+) on transport, as well as NH(4)(+) transport itself, in colonic epithelium is poorly understood. We elucidate here the effects of apical NH(4)(+) on cAMP-stimulated Cl(-) secretion in colonic T84 cells. In HEPES-buffered solutions, 10 mM apical...

The ammonia-oxidizing archaea have recently been recognized as a significant component of many microbial communities in the biosphere. Although the overall stoichiometry of archaeal chemoautotrophic growth via ammonia (NH(3)) oxidation to nitrite (NO(2)(-)) is superficially similar to the ammonia-oxidizing bacteria, genome sequence analyses point to a completely unique biochemistry. The only ge...

BACKGROUND Many newborn babies experience low blood glucose concentrations, a condition referred to as neonatal hypoglycaemia (NH). The effect of NH on visual development in infancy and childhood is of interest because the occipital lobes, which include the primary visual cortex and a number of extrastriate visual areas, may be particularly susceptible to NH-induced injury. In addition, a numbe...

Nakhoul, Nazih L., Kathleen S. Hering-Smith, Solange M. Abdulnour-Nakhoul, and L. Lee Hamm. Transport of NH3/NH4 1 in oocytes expressing aquaporin-1. Am J Physiol Renal Physiol 281: F255–F263, 2001.—The aim of this study was to determine whether expressing aquaporin (AQP)-1 could affect transport of NH3. Using ion-selective microelectrodes, the experiments were conducted on frog oocytes (cells ...

In low-temperature flash photolysis of NH3/O2/N2 mixtures, the NH2 consumption rate and product distribution is controlled by reactions + HO2 → products (R1), H (+M) NH3 (R...