碳源对浑球红假单胞菌P4株氧化—还原反应平衡的影响

本文采用浑球红假单胞菌Ｐ４株作为研究对象，分析了光合细胞在厌氧光照条件下：①利用乙醇或乙酸为碳源时，对ＣＯ２依赖性的差异；②利用乙醇为碳源时，氢气发生量与添加ＣＯ２浓度的关系；③利用一些有机碳源时，氢气发生量与碳代谢中的关键酶活性的变化。从而阐明了光合细菌利用不同碳源时，实现细胞内氧化－还原反应平衡的复杂调控机制。     

催化光度法测定痕量铜Cu(Ⅱ)—甲酚红—H_2O_2体系

本文研究了在氨水介质中,铜(Ⅱ)催化H_2O_2氧化甲酚红褪色新指示反应及其动力学条件,建立了测定痕量铜的新方法.方法具有高灵敏度和高选择性.线性范围为2 8ng/25ml.检测限为7×10~(-11)g/ml.方法应用于地下水和生物样中铜的测定,结果令人满意.     

Azone对红细胞膜流动性的影响

用DPH荧光偏振度测量法研究了透皮吸收促进剂Azone对红细胞膜的作用.结果表明,Azone能增加膜的流动性.机理可能是Azone嵌入细胞膜,增加了脂质烃链的活动性.     

据牙形石带的研究论证黔北下奥陶统红花园组的穿时性

黔北下奥陶统红花园组属岩石地层单位。本文据牙形石带的展布,论证红花园组是一穿时岩石地层单位,其底界层位由西向东逐渐降低;顶界由西向东增高,呈楔状向西楔入桐梓组与湄潭组之间。     

NH^＋4激活人红细胞膜Na^＋,K^＋—ATP酶的研究

用人红细胞膜为材料,以NH_4~+代替K~+激活Na~+,K~+—ATP酶,探讨K~+或NH_4~+激活人红细胞膜Na~+,K~+—ATP酶的异同以及Na~+,K~+—ATP酶对强心苷类K—毒毛旋花苷及有机溶剂乙醇的敏感性。结果表明:(1) NH_4~+可代替K~+来激活Na~+,K~+—ATP酶且两者具有相同的作用机理;(2) 用NH_4~+激活Na~+,K~+—ATP酶时,强心苷类药物对该酶具有用K~+激活该酶同样的抑制作用,乙醇可使K~+或NH_4~+激活的Na~+,K~+—ATP酶失活。     

遗传球形红细胞增多症红细胞膜力学特性研究

彩和微管吸吮实验技术并结合十二烷基硫酸钠－聚丙烯酰胺凝胶电泳等生化方法研究遗传球形红细胞增多症红细胞膜粘弹性特及膜骨架蛋白的变化。结果表明：ＨＳ红细胞膜的弹性模量和正常对照组比较无明显差异而粘性系数显著高于正常值,细胞粘滞性增大型汽轮发电机组轴系的变形能力降低;     

红丝线化学成分研究(Ⅱ)

研究了红丝线(Lycianthes biflora)的化学成分.采用硅胶柱色谱法进行分离,从其氯仿提取物中分得了5个化合物,经波谱分析化合物分别鉴定为:香兰子酸(1),正二十四烷酸(2),β-谷甾醇(3),β-胡罗卜甙(4),丁香脂素(5),这5种化合物都是首次从红丝线中分离到的.     

Effects of pH on structure and function of single living erythrocyte

The spontaneous changes in cell shape and size, the membrane bending elastic modulus, and the structure and functions of intracellular hemoglobin of single human living erythrocyte incubated in different suspension pH were studied. The non-invasive, in situ, real time measurements on the parameters at the three levels of intracellular molecule, membrane and cell morphology were performed simultaneously by using a fast micro-image analyzing technology and a multi-channel micro-spectrophotometer system. The result shows that the cell shape and size, the mechanical property of the cell membrane, and the structure and function of intracellular hemoglobin are correlated and affected by each other with pH.     

北京2种鸟类的新分布记录

Two new records of birds occurred in Beijing are reported. Two flocks of Chinese Bulbul (Pycnontus sinensis sinensis) composed of 38 individuals were found in Hongluosi of Huairou County in September 26—27, 2002. One male Red-winged Crested Cuckoo ( Clamator coromandus ) was observed in Xiaolongmen Wood Farm of Mengtougou District on May 23, 2000. Further surveys indicate that Chinese Bulbul is a resident species of birds in Beijing, the distribution sites include Haidian, Shunyi, Huairou and Fangshan; while Red-winged Crested Cuckoo, a summer visitor, arrives in Beijing in the middle ten days of May and migrates southward in early September. These findings together with the records of Crossoptilon mantchuricum, Ficedula mugimaki, Fringilla coelebs coelebs, F. beijingnica, Phylloscopus sichuanensis since 1990 have increased the bird species living in Beijing from 344 to 351. Habitat restoration and intensive surveys may increase avian species diversity of Beijing.     

红汁乳菇生态习性及应用前景

红汁乳菇(Lactarius hatsudake Tanaka)属红菇科，乳菇属，是一种营养价值、药用价值极高的美味菌，本文对其分布、生长特性、菇体形态、菌丝体发酵及其应用进行了综述，并提出了今后开发利用的方向。