外源性磷酸肌酸对重度窒息新生儿血清S—100B蛋白及NSE水平的影响

目的：探讨外源性磷酸肌酸对重度窒息新生儿血清S-100B蛋白和特异性神经元烯醇化酶含量（NSE）的影响。方法：重度窒息的新生儿40例,随机分为两组,常规治疗组21例,给予一般治疗（氧疗、支持、对症）和胞二磷胆碱治疗。磷酸肌酸治疗组19例,在常规治疗基础上,生后12h内给予磷酸肌酸治疗lg／d）,另外同期住院的新生儿湿肺和黄疸患儿14例为正常对照组。均与生后48h和生后10天取血检测血清S-100B蛋白和NSE含量。并于生后第14天进行新生儿行为神经测定（NBNA评分）。结果：磷酸肌酸治疗组和常规治疗组患儿生后48h血清s．100B蛋白和NsE含量无显著差异（※P〉0．05,※P〉0．05）,与正常对照组比较差异具有显著性（△P〈0．05,AP〈0．05）,生后10天血清S．100B和NSE含量在常规治疗组患儿和磷酸肌酸组相比具有显著差异,磷酸肌酸治疗组两者明显下降（※P〈0．05,※P〈0．05）。生后三周的行为神经评估（NBNA评分）〈35分者所占百分比磷酸肌酸治疗组27％与常规治疗组组53％比较,差异均具有显著性意义（x2=6．112,※P〈0．05）。结论：磷酸肌酸用于治疗新生儿缺氧缺血性脑病能够改善脑的能量代谢,降低脑损伤的程度,改善神经行为,降低致残率。     

外源性磷酸肌酸对重度窒息新生儿血清S-100B 蛋白 及NSE 水平的影响

目的:探讨外源性磷酸肌酸对重度窒息新生儿血清S-100B蛋白和特异性神经元烯醇化酶含量(NSE)的影响。方法:重度窒息的新生儿40例,随机分为两组,常规治疗组21例,给予一般治疗(氧疗、支持、对症)和胞二磷胆碱治疗。磷酸肌酸治疗组19例,在常规治疗基础上,生后12h内给予磷酸肌酸治疗1g/d),另外同期住院的新生儿湿肺和黄疸患儿14例为正常对照组。均与生后48h和生后10天取血检测血清S-100B蛋白和NSE含量。并于生后第14天进行新生儿行为神经测定(NBNA评分)。结果:磷酸肌酸治疗组和常规治疗组患儿生后48h血清S-100B蛋白和NSE含量无显著差异(※P>0.05,※P>0.05),与正常对照组比较差异具有显著性(△P<0.05,△P<0.05),生后10天血清S-100B和NSE含量在常规治疗组患儿和磷酸肌酸组相比具有显著差异,磷酸肌酸治疗组两者明显下降(※P<0.05,※P<0.05)。生后三周的行为神经评估(NBNA评分)<35分者所占百分比磷酸肌酸治疗组27%与常规治疗组组53%比较,差异均具有显著性意义(x2=6.112,※P<0.05)。结论:磷酸肌酸用于治疗新生儿缺氧缺血性脑病能够改善脑的能量代谢,降低脑损伤的程度,改善神经行为,降低致残率。     

Effect of temperature on water transport through aquaporins

The mean effective water self-diffusion coefficient in maize root segments under the effect of aquaporin blocker (mercuric chloride, 0.1 mM) was measured using the spin-echo NMR method with pulsed magnetic field gradient within the temperature range from 10 to 35 °C. HgCl₂ caused the reduction in water diffusion by 30 % as compared to the control samples. Temperature dependences of water self-diffusion coefficients showed two linear regions with different values of Q₁₀ and activation energy, E_a. As the temperature reduced from 20 to 10 °C, E_a values calculated from the Arrhenius plots were close to those of bulk water (20 ± 3 kJ mol⁻¹) and slightly changed for the sample pretreated HgCl₂. Within the temperature range from 25 to 35 °C the slope of temperature dependences became steeper and E_a values were 31 ± 3 kJ mol⁻¹ for the control and 40 ± 4 kJ mol⁻¹ for the treated sample. In the vicinity of 20 °C, the temperature dependence of water diffusion via the mercury-sensitive water channels showed extreme value. In the region, the specific area of the mercury-sensitive aquaporins was 0.004 % of the total cell surface area. The data indicate that water transfer via aquaporins is sensitive to temperature, and the contributions of the transmembrane pathways (aquaporins, lipid bilayer) differ in different temperature ranges.     

Contribution of the actomyosin motor to the temperature-dependent translational diffusion of water by cytoplasmic streaming in Elodea canadensis cells

Summary. The extent to which the actomyosin motor responsible for cytoplasmic streaming contributes to the translational diffusion of water in Elodea canadensis cells was studied by a nuclear magnetic resonance (NMR) spin-echo technique. The relative contribution of the actomyosin motor was determined from the corresponding apparent diffusion coefficient by the Einstein–Smolukhovsky relation. It is equal to the difference between the diffusional displacements of the cytoplasmic and the bulk water (X). The NMR data show that the temperature dependence of X is humpshaped, which is characteristic of enzyme reactions. At the same time, the apparent diffusion coefficient of cytoplasmic water increases with an increase in temperature. The most significant contribution of the actomyosin motor to X is observed at temperatures below 20°C. Within the temperature range of 20 to 33°C, X changes only slightly, and a further increase in temperature reduces X to zero.     

桂木茎枝化学成分的研究

从桂木(Artocarpus nitidus subsp.lingnanensis)茎枝中分离得到13个化合物。通过波谱分析,分别鉴定为albanin A(1)、brosimone I(2)、cycloartocarpin A(3)、artotonkin(4)、albafuran A(5)、artocarpin(6)、artogomezianone(7)、β-香树素乙酯(8)、3,4-二羟基苯甲醛(9)、3,4-二羟基苯甲酸(10)、3-甲氧基-1,2-丙二醇(11)、β-谷甾醇(12)和β-胡萝卜苷(13)。这些化合物为首次从桂木中分离得到。     

Fauna of hydromedusae (Cnidaria: Hydrozoa) of the northwestern Sea of Japan

A brief overview of studies of hydromedusae (Cnidaria: Hydrozoa) of the northwestern Sea of Japan is provided. Based on literature data and plankton sampling by the authors, an annotated checklist of hydromedusae of the northwestern Sea of Japan was compiled for the first time. It includes 25 species belonging to 20 families and 5 orders.     

Somatic Embryogenesis and Analysis of Peroxidase in Cultured Lettuce (Lactuca sativa L.) Cotyledons

Somatic embryos were induced in lettuce cotyledons culturedon Murashige and Skoog's (MS) medium containing either 2 mgl^–1 6-benzylaminopurine (BA) and 0.2 mg l^–1 naphthaleneaceticacid (NAA) or 0.2 mg l^–1 BA and 2 mg l^–1 NAA. Bothcombinations induced a frequency of over 70%. The explants culturedonly in the presence of 2,4-dichlorphenoxyacetic acid (2,4-D)did not produce somatic embryos. The development of the embryoidswas studied histologically and by scanning electron microscopy.Peroxidase activity was assayed and the isoenzyme pattern ofcalluses was determined by polyacrylamide gel electrophoresis.Callus from an embryogenic line showed a much higher peroxidaseactivity than that from a non-embryogenic line, one extra peroxidaseisozyme band being present and typical of the embryogenic callus.No qualitative differences were detectable between the embryogeniccalluses. Lactuca sativa L, lettuce, somatic embryogenesis, peroxidases, isoenzymes     

Water diffusion in cytoplasmic streaming in Elodea internodal cells under the effect of antimitotic agents

The translational displacement of the cytoplasmic water in Elodea stem cells resulting from protein motor activity was measured using the NMR method. A 24-h treatment with vincristine results in a reduction of the translational displacement of the cytoplasmic water. With a constant cytoplasmic streaming velocity, the dynamics of the translational displacement of the cytoplasmic water under the effect of taxol are characterized by a continuous increase at a concentration of 0.05 mM, and reaching a plateau at a concentration of 0.5 mM.     

Characterization of communities of heterotrophic bacteria associated with healthy and diseased corals in Nha Trang Bay (Vietnam)

A comparative investigation of the heterotrophic microflora of 11 species of healthy corals and of white-band-diseased and yellow-band-diseased corals inhabiting the reefs of Nha Trang Bay (Vietnam), which has been exposed to anthropogenic impact, was performed. Fifty-nine strains of heterotrophic bacteria isolated on Y/K and Endo media were investigated and characterized. All the isolates were identified at the genus level by consideration of the results of analysis of their phenotypic properties, determination of the molar percent of G+C bases in their DNA, and the composition of fatty acids of their lipids. In the composition of the microflora of tissues of healthy corals, gamma-proteobacteria prevailed, with halomonads being dominant among them. In addition, the gram-negative bacteria included Pseudomonas and Vibrio spp., members of the Cytophaga-Flavobacterium-Bacteroides (CFB) phylogenetic cluster, and Moraxella sp. The gram-positive bacteria revealed included Bacillus, Staphylococcus, Halococcus, and Micrococcus spp., and coryneform bacteria. In the composition of the microflora of the tissues of affected corals, bacteria of the family Enterobacteriaceae and of the genera Planococcus and Arthrobacter, which were not revealed in healthy hydrobionts, were found. The anthropogenic impact is not the sole factor determining the infection of corals.