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11.
The mechanism of interaction of an external magnetic field with liquid was proposed. The statistical integral and configurational contributions for a free energy, entropy and specific heat for the soliton model of bulk knitted structures in a magnetic field were calculated. It was shown that the concentration of solitons depends on the effect of external fields. In the specific case of bulk knitted structures (liquid water without magnetic field), the theoretical data are consistent with experimental. The memory effects in systems with hydrogen bonds in magnetic field was explained in the framework of the continuum soliton concept. 相似文献
12.
We have determined the DNA sequence of the distal 148 codons of trpE and
all of trpG in Pseudomonas aeruginosa. These genes encode, respectively,
the large and small (glutamine amidotransferase) subunits of anthranilate
synthase, the first enzyme in the tryptophan synthetic pathway. The
sequenced region of trpE is homologous with the distal portion of E. coli
and Bacillus subtilis trpE, whereas the trpG sequence is homologous to the
glutamine amidotransferase subunit genes of a number of bacterial and
fungal anthranilate synthases. The two coding sequences overlap by 23 bp.
Codon usage in these Pseudomonas genes shows a marked preference for codons
ending in G or C, thereby resembling that of trpB, trpA, and several other
chromosomal loci from this species and others with a high G + C content in
their DNA. The deduced amino acid sequence for the P. aeruginosa trpG gene
product differs to a surprising extent from the directly determined amino
acid sequence of the glutamine amidotransferase subunit of P. putida
anthranilate synthase (Kawamura et al. 1978). This suggests that these two
proteins are encoded by loci that duplicated much earlier in the phylogeny
of these organisms but have recently assumed the same function. We have
also determined 490 bp of DNA sequence distal to trpG but have not
ascertained the function of this segment, though it is rich in dyad
symmetries.
相似文献
13.
突触可塑性对于脑发育过程中的神经环路重构以及学习记忆等脑的高级功能是非常重要的。许多受体酪氨酸激酶家族成员,包括TrkB、ErbB和Eph在神经连接的建立和重构过程中起到核心作用。比如,突触后EphB依赖的信号会导致树突棘的产生和神经递质受体的聚集,而ephrinA引起的EphA4激活可以导致树突棘的回缩。但是,目前对EphA4依赖的树突棘重组和对神经递质受体的调节背后的机制还知之甚少。本文将集中探讨EphA4及其下游的信号通路在神经肌肉接头和中枢神经的突触中,对神经递质受体的调节功能。 相似文献
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Sabaté M Giessen Wv Deshpande N Ligthart J Kay I Bruining N Serruys P 《International journal of cardiovascular interventions》1999,2(1):55-59
We report a patient who received a stent following intracoronary 3-irradiation. Despite a good initial angiographic result, the stent appeared to be not fully expanded on intravascular ultrasound imaging at 6-month follow-up. Four months later, sudden thrombotic occlusion occurred shortly after aspirin cessation. 相似文献
16.
The water quality of the Siluko River, Edo State, Nigeria was investigated from March to August 2015 to determine its suitability for drinking and usage for domestic purposes. Water samples collected from three stations were tested for thirteen physico-chemical parameters using standard analytical procedures. Temperature, phosphate and chloride were significantly different across the three stations. All other parameters, with the exception of turbidity, dissolved oxygen and phosphate, were within the permissible limits recommended by the Nigerian Standard for Drinking Water Quality (NSDWQ) and World Health Organization (WHO). Water Quality Index (WQI) values ranged from 11.24 to 16.15, indicating excellent water quality. While the quality of the water from the Siluko River is suitable for drinking and domestic usage, to prevent future deterioration of the water, it is recommended that the regulating authorities monitor effluents discharged into the river from human activities. 相似文献