烟草多酚氧化酶的分离与固定化技术研究

多酚氧化酶属于氧化还原酶类,国际酶学委员会推荐名为儿茶酚氧化酶（ＥＣ１．１０．３．１ｐｏｌｙｐｈｅｎｏｌｏｘｉｄａｓｅ,ＰＰＯ）．该酶与食品工业、三废处理、医药卫生关系较为密切,因而研究较多．如近年来鸭梨［１］、蘑菇［２］、香蕉果肉组织［３］、荔枝果皮［４］等等中的多酚氧化酶均有研究报道．目前研究用固定化多酚氧化酶检测废水中酚类物质含量,进行环境检测;及其从工业废水中除去酚类,达到治理三废的目的．Ｍｏｓｂａｃｎ［５］（１９７６）研制成多酚氧化酶固定化酶柱,与氧电极检测器组合联用,可检测水中２０…     

巯基修饰对中华仓鼠二氢叶酸还原酶的激活

脊椎动物二氢叶酸还原酶（ＤＨＦＲ,Ｅ．Ｃ．１．５．１．３）可被多种因素激活,如中性无机盐［１］、蛋白质变性剂［１～４］、巯基修饰剂［１,４～７］等．来源于鸡肝［５］、猪肝［６］、鼠肝［７］及鼠Ｌ１２１０细胞［４］二氢叶酸还原酶的巯基修饰激活已有报道．...     

RT-PCR检测庚型肝炎病毒的研究

ＲＴ－ＰＣＲ检测庚型肝炎病毒的研究王孝华王健梅［１］林玉兵［２］陈禹保［２］孙钦喜［３］［１］湖南师大生物系［２］北京科海医疗生物工程公司［３］山东潍坊人民医院（湖南省临床检验中心,长沙４１０００６庚型肝炎病毒是Ｓｉｍｍｏｎｓ等于１９９５年证实的一种非Ａ－Ｅ型肝炎病毒［１］。随后在我国也证实有庚型肝炎病毒（ＨＧＶ）存在［２］。有资料表明,ＨＧＶ在美国供血员中的流行情况较ＨＣＶ严重,并且与供血...     

微核仁是富含剪接因子SC35的核内小体

许多植物细胞核中存在一些较小的球形或卵圆形的结构,不同作者分别将其称为球体（ｓｐｈｅｒｕｌｅｓ）［１］、核体（ｋａｒｙｏｓｏｍｅ）［２］、核仁附着小体（ｎｕｃｌｅｏｌｕｓａｓｏｃｉａｔｅｄｂｏｄｉｅｓ）［３］、螺旋小体（ｃｏｉｌｅｄｂｏｄｉｅｓ）［４...     

半自然条件下初生獐的卧躺行为和母獐警戒性研究

捕食作用很可能对许多有蹄类母幼社会行为的形成起到关键作用［１］,我们可以用这些幼兽所采用的两个自卫性行为策略“躲藏”（ｈｉｄｉｎｇ）和“追随（母兽）”（ｆｏｌｌｏｗｉｎｇ）得以证实［２］。“追随”多见于在开阔生境且没有躲藏地点,并常常和迁徙习性有关［...     

蜘蛛抱蛋根茎中的甾体皂甙

从蜘蛛抱蛋（ＡｓｐｉｄｉｓｔｒａｅｌａｔｉｏｒＢｌ．）根茎的甲醇提取物中分离得两个甾体皂甙。经波谱解析及化学降解证明其化学结构分别为薯芋皂甙元一３一Ｏ－［Ｂ－Ｄ－葡萄吡喃糖基（１→２）］－［Ｂ－Ｄ－木吡喃糖基（１→３）］－Ｂ－Ｄ－葡萄吡喃糖基（１→４）－Ｂ－Ｄ一半乳吡喃糖甙（即蜘蛛抱蛋甙ａｓｐｉｄｉｓｔｒｉｎ）及新静诺特皂甙元－３－Ｏ－［Ｂ－Ｄ－葡萄吡喃糖基（１→２）］～［Ｂ－Ｄ－木吡喃糖基（１→３）－Ｂ－Ｄ－葡萄吡喃糖基（１→４）一Ｂ－Ｄ－半乳吡喃糖甙,后者为一新试,命名为新蜘蛛抱蛋甙ｒｅｏａｓｐｉｄｉｓｔｒｉｎ。     

螯合剂对原生质体融合的影响

螯合剂对原生质体融合的影响王建华（中国农业科学院饲料研究所北京１０００８１）赵学慧（华中农业大学食品微生物学研究室武汉４３００７０）自从Ｋａｏ［１］发现聚乙二醇（ＰＥＧ）能高效介导植物原生质体融合以来,至今它仍不失其作为植物、微生物原生质体促融合剂的...     

对“功能反应函数为x~(1/2)的食饵-捕食系统的定性分析”一文的注记

重新分析了文［１］所讨论过的功能反应函数为ｘ~（１／２）的捕食系统（１）,分析了此系统在第一象限内轨线的拓朴结构,证明了系统（１）的唯一正平衡点如果不稳定,则存在唯一（稳定）极限环;如果稳定,则全局稳定于此正平衡点,纠正了文［１］中关于系统（１）极限环的存在性、稳定性等方面的一些结论．     

PCR法检测对虾皮下和造血器官坏死杆状病毒

皮下和造血器官坏死杆状病毒（ＨＨＮＢＶ）［１］、对虾杆状ＤＮＡ病毒（ＰＲＤＶ）［２］和白斑杆状病毒（ＷＳＢＶ）［３］是近年来引起全球对虾暴发性死亡的病原。这三种病毒同属杆状病毒属Ｃ杆状病毒亚群中的新病毒,在流行病学和病理学特征上十分类似,因此,我们...     

手性高效液相色谱法测定S（＋）—布洛芬对映体过量

用手性固定相高效液相色谱法测定了样品或样品或微生物酶不对称水解反应液中Ｓ（＋）－布洛芬对映体过量。该法首先将布洛芬转化为二苯酰胺衍生物,然后在Ｎ－３,５－二硝基苯甲酰－（Ｒ）－苯甘氨酸［（Ｒ）－ＤＮＢ－ＰＧ］的共价型ＣＳＰ柱上进行对映体ＨＰＬＣ分离。流动相选择正已烷－异丙醇（９８：２）,流速１ｍｌ／ｍｉｎ,对映体分离度１．４７。按相同方法同时进行消旋布洛芬的二苯酰胺衍生物的分离,由其对映体峰高比可     

Investigation of the mechanism of temperature sensitivity of the electroreceptors of ampullae of lorenzini

In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980.     

Principles of organization and evolution of systems of regulation of functions

Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms. The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning of physiological systems and organs of the living organism