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Zusammenfassung Extrakte aus Weizenpflanzen enthalten ein System, welches Chlorocholinchlorid zu Cholinchlorid umwandelt. Dieses System wird durch pH, aber nicht durch die Temperatur beeinflusst und hat zwei Komponenten; die erste wird durch ZnCl2 gefällt, und die andere ist dialysierbar. 相似文献
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F. Benazet M. Cartier J. Florent C. Godard G. Jung J. Lunel D. Mancy C. Pascal J. Renaut P. Tarridec J. Theilleux R. Tissier M. Dubost L. Ninet 《Cellular and molecular life sciences : CMLS》1980,36(4):414-416
Summary Nosiheptide (9671 R.P.) isolated fromStreptomyces actuosus 40037 (NRRL 2954) is a sulfur-containing polypeptidic antibiotic, quite different from all the other members of this family. Very active in vitro against gram-positive bacteria, it is inactive in vivo in experimentally infected mice. Not toxic, even at high dose, it may be used as a feed additive for chickens and pigs and it shows a favourable effect on the growth and conversion index. 相似文献
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Jung A Maier R Vartanian JP Bocharov G Jung V Fischer U Meese E Wain-Hobson S Meyerhans A 《Nature》2002,418(6894):144
The genome of the human immunodeficiency virus is highly prone to recombination, although it is not obvious whether recombinants arise infrequently or whether they are constantly being spawned but escape identification because of the massive and rapid turnover of virus particles. Here we use fluorescence in situ hybridization to estimate the number of proviruses harboured by individual splenocytes from two HIV patients, and determine the extent of recombination by sequencing amplified DNA from these cells. We find an average of three or four proviruses per cell and evidence for huge numbers of recombinants and extensive genetic variation. Although this creates problems for phylogenetic analyses, which ignore recombination effects, the intracellular variation may help to broaden immune recognition. 相似文献
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Wing-Fu Lai Jong-Min Lee Han-Sung Jung 《Cellular and molecular life sciences : CMLS》2014,71(9):1691-1701
Continuous replacement of teeth throughout the lifespan of an individual is possibly basal for most of the vertebrates including fish and reptiles; however, mammals generally have a limited capacity of tooth renewal. The ability to induce cellular differentiation in adults to replace lost or damaged cells in mammals, or to tissue-engineer organs in vitro, has hence become one of the major goals of regenerative medicine. In this article, we will revisit some of the important signals and tissue interactions that regulate mammalian tooth development, and will offer a synopsis of the latest progress in tooth regeneration and repair via molecular and engineering approaches. It is hoped that this article will not only offer an overview of recent technologies in tooth regeneration and repair but will also stimulate more interdisciplinary research in this field to turn the pursuit of tooth regeneration and repair into practical reality. 相似文献
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为了查明岩石压入硬度与声发射参数如累计信号数、总能量、峰值RMS(信号均方根值)、积分RMS等之间的关系,在9种不同的岩石中进行了压入试验。结果表明:岩石压入硬度与声发射信号的积分RMS有最好的相关关系。有可能利用积分RMS这一参数来估价岩石压入硬度,并进一步预报岩石可钻性。 相似文献
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Summary Progesterone stimulates the rate and efficiency of respiration-dependent contraction of heart mitochondria in nitrate salts at alkaline pH. Ion extrusion under these conditions is normally slow and inefficient due to the elevated permeability of the membrane to monovalent cations through a putative uniport pathway. Progesterone also inhibits passive swelling under these conditions and appears to act by restricting cation influx through the uniport pathway.This study was supported in part by United States Public Health Service grant No. HL09364. 相似文献