磁处理对红壤酶活性和牧草（苏丹草）幼苗生长的影响

磁生物效应即外加磁场或磁处理对生物的影响,是生物磁学的重要组成部分,也是土壤磁学和环境磁学中正在开拓的领域[1]。60年代以来,随着现代磁学和分子、量子生物学的迅猛发展,同时也是为了工农业生产、医药卫生、环境保护等发展的需要,磁生物效应的研究不断扩大和深入,磁生物效应机制的探讨和研究由宏观走向微观,由单纯的物理和化学效应观察走向生物生理和生化的研究。当前,磁生物效应研究逐渐向各学科渗透,一方面为磁处理技术在各科学领域的应用提供理论依据和技术参数,另一方面从不同的角度来揭示磁生物效应的微观机制。本文着重研究了磁…     

效应与包含体的变性和复性

Ｈｏｒｍｅｉｓｔｅｒ效应反映了溶质小分子通过与水分子的相互作用,对蛋白质等生物大分子造成的结构上的影响。通过对此效应的深入研究,可以从个解释许多常见的生理生化现象。蛋白质的变性、复性问题是与Ｈｏｒｍｅｉｓｔｅｒ效应密切相关的生化基础课题。目前重组蛋白生产过程中包含的变性和复性问题为上述理论研究提供了广泛的应用空间。     

Hofmeister效应与包含体的变性和复性

Hofmeister效应反映了溶质小分子通过与水分子的相互作用, 对蛋白质等生物大分子造成的结构上的影响.通过对此效应的深入研究, 可以从理论上解释许多常见的生理生化现象.蛋白质的变性、复性问题是与Hofmeister效应密切相关的生化基础课题. 目前重组蛋白生产过程中包含体的变性和复性问题为上述理论研究提供了广泛的应用空间.     

生物磁学在农作物生产中的应用

主要综述了磁场和磁化水在农作物生产上的应用研究现状,以及生物效应和作用机理研究进展,提出了今后需深入研究的有关问题。     

蛋白激酶C与细胞调控

生物体内的信息从胞外向胞内传递,调节控制细胞的增殖与分化,这种作用的生化基础一直是人们感兴趣的课题。不同生物信息分子作用于同一细胞表面的不同受体,其胞内传递途径是否相同?同一胞外信号作用于不同细胞,产生不同生理效应,其信息途径是否各异?细胞转化与哪条信息传递途径变化有关?这些问题目前都尚属未知。近年来,一条新的细胞内信息传递途径——肌醇磷脂途径已越来越被重视,而蛋白激酶C则是这一途径中的一个重要物质。本文拟就蛋白激酶C(protein kinase c,PKC)与细胞调控的近期研究作一介绍。一、肌醇磷脂代谢与蛋白激酶C 许多细胞在外部信号作用时,其膜上磷脂均发生变化。近年研究表明,起重要作用的是     

《生物化学实验技术》

本书是《生物实验室系列》中的一本,是一部综合性著作,内容覆盖了有关生物化学实验技术的诸多领域,从原始取材到生物大分子结构与功能的研究、从基本原理到实验操作都作了深入而详实的全面阐述。全书包括生物制备和分析检测方法;免疫学方法在生化实验中的应用;还用较大篇幅着重叙述了生物大分子的分离纯化及其结构与性质的研究．作为一本实验技术类的图书,     

低能离子束在生物技术中的应用研究

自从发现离子注入生物效应后,低能离子与生物体系相互作用研究在我国率先兴起,并很快投入应用。简要介绍低能离子注入生物效应的机理研究和应用研究的进展状况,并展望未来 。     

消失波生物传感器及其在DNA与免疫分析中的应用

消失波光纤生物传感器是近年来发展很快的一项的分析技术。它现在已成为分了生物学领域的热门技术。本文叙述消失波生物传感器的识别元件,换能装置以及检测研究系统的研究进展。着重讨论消失波技术在ＤＮＡ检测与免疫检测中的应用。并对这些技术的应用价值做出评价。     

顺磁弛豫增强效应在蛋白质结构及动力学上的应用

未成对电子与观测核之间的偶极—偶极相互作用所引起的顺磁弛豫增强效应能够提供丰富的长程结构信息。近年来,人们在生物大分子中引入顺磁性物质,将这一独特的长程结构信息应用到蛋白质研究的方方面面,这使得顺磁NMR成为结构生物学中颇有潜力的"新"工具。本文综述了顺磁弛豫增强效应在蛋白质三维结构解析、蛋白质相互作用以及蛋白质动力学研究等方面的最新应用。     

高级生化工程

本书为高级生化工程学专集,共收集10篇专著,多为工程学专家撰稿。书中内容侧重生物工程学原理的应用。对生物反应器,生物量提纯和生物产品的浓缩与回收论述甚详。是发展高技术的重要参考书之 ,可供生物工程,生化工程、分子生物学等科研工作者及高校有关专业师生参考。     

再论一类酶促反应化学动力系统

研究文[2]所讨论过的关于C.S.T.R反应器的一类两分子饱和反应模型x=-k1xy+q(x0+x),y=k1xy-kzy/1+ry-qy,并给出了一些具有指导实践意义的信息.     

两对等位基因群体熵的性质

研究了两对等位基因群体熵的性质,并对位点多样度D与基因相对信息量多样度S′(G)进行了比较研究．结果表明,在遗传变异的度量上,位点多样度D与基因相对信息量多样度S′(G)具有一致性,且S′(G)还具有信息学内涵．     

水稻病毒激光喇曼光谱的初步探讨

本文初步探讨水稻病毒激光喇曼光谱,分析了谱线与病毒中核酸蛋白质结构的关系。确信应用激光喇曼光谱研究水稻病毒是具有信息量大、高灵敏及高分辨本领的。     

Increased frequencies of micronuclei in T8 lymphocytes of smokers

Micronucleus frequencies and mitotic indices were analyzed in B, T4, and T8 lymphocytes from 40 smokers and 42 non-smoking referents. The highest level of micronuclei was found in T4 cells followed by T8 and B cells. These differences were statistically significant. There were statistically significant linear correlations between the micronucleus frequencies of all three subsets. There was a statistically significant effect of smoking only in the T8 cells. Smoking also increased the number of neutrophilic granulocytes and lymphocytes in the peripheral blood. There was a statistically significant effect of age on the micronucleus frequencies in T4 and T8 lymphocytes. The mitotic indices did not have any effect on the micronucleus frequencies and they were not influenced by smoking, age or sex.     

猕猴桃属植物生物学特征特性观测

观测了猕猴桃属４１个种或变种、变型及２个种间杂交后代的幼苗、成年植株、花器、果实及种子等的植物学特征及物候期、开花结果习性等生物学特性,为该属植物的系统发育、杂交育种选择亲本、定向培育以及制定相应的栽培技术措施等研究提供了科学依据．     

The action of infrasound oscillations on the properties of water and of a DNA solution

The effect of mechanical vibrations (MV) electrical conductivity of water and optical density of aqueous DNA solution. Distilled water was treated with MV of several frequencies from 3 to 5000 Hz with an intensity of 90 dB for 30 minutes. Different sensitivities of water specific electrical conductivity (SEC) were determined (the value of distilled water SEC was 209 +/- 2 microS/m). The greatest decrease of SEC (by 15.7%) under the influence of MV was observed at the frequency of 4 Hz. There was no effect at frequencies higher than 100 Hz. The treatment of DNA water solutions with MV of frequencies 4 and 10 Hz decreased its optical density by 4.2 +/- 1.1 and 4.8 +/- 1.2% correspondingly in comparison with control. In cases of treatment with frequencies of 20 and 50 Hz no effect was observed. The mechanism of MV effect on water can be connected with the changes of system structural characteristics. It is confirmed by experiments with DNA solution, where the decrease of optical density (at 260 nm) under MV treatment is conditioned with the increase of the probability of hydrogen binding formation between the bases.     

Temporal summation and reaction time for grid detection

We studied the stimulus-duration effect on the reaction time (RT) to gratings with different spatial frequencies. At each duration value, the product of the contrast and the duration, i.e. the contrast "energy" was kept constant. We found that at near-threshold "energy" levels the RT was constant for up to 15 ms at lower spatial frequencies and up to 30 ms at higher spatial frequencies. At higher "energy" levels, this critical interval was the same (up to 15 ms) for both lower and higher spatial frequencies. The effect of the duration of gradual onset of the stimulus on RT was also studied. An increase of onset duration (up to 60 ms) at low spatial frequencies substantially delayed reaction time for the contrasts under study. Conversely, at high spatial frequencies, this effect was present only for gratings with a high contrast. These results suggest that reaction time is determined by two types of mechanisms (transient and sustained) at a near threshold contrast, and by one type (transient) mechanism at higher contrasts.     

片口自然保护区植被的遥感分类

采用样方法对四川片口自然保护区的植被进行本底调查,利用野外普查数据和卫星照片解译相结合的技术,分析其植被现状。结果表明：片口自然保护区的植被类型比较丰富,且保存较完整,共有6种植被类型和15种群系。     

Synchronization in a pool of mutually coupled oscillators with random frequencies

An exact solution to a model of mutually interacting sinusoidal oscillators is found. Limits on the variation of the native frequencies are determined in order for synchronization to occur. These limits are computed for different distributions of native frequencies.This research was supported by NSF Award No. MCS8300885 and the Alfred Sloan Foundation.     

Comparative analysis of the infant EEG at gestation term 30-42 weeks

The research involved comparison of characteristics of the power spectrum, index, coherence of the EEG at preterm and full-term infants of the first month of life. 6 groups of children are surveyed: (1) 30-32, (2) 33-34, (3) 35-36, (4) 37-38, (5) 39-40, (6) 41-42 weeks of gestation; each group consisted of 10 children. Capacity of delta frequencies was high in the 5th group. Capacity of theta frequencies was high in the 3rd group. The index of theta frequencies was high in the 2nd, 3rd and 4th groups. Capacity of alpha frequencies was hagh in the 2nd group. The index of alpha frequencies was high in the 1st, 2nd and 3rd groups. Indexes and of beta1- and beta2-frequencies were higher in the 1st, 2nd and 4th groups. The maximum quantity of coherent delta, theta and alpha frequencies was in the 6th group. In the 2nd group, in comparison with 5th group, were more coherent delta frequencies in the occipital and occipital-central areas. The results obtained show that the spectrum of capacity, indexes and coherence of the EEG depend on term of gestation at the moment of birth but this dependence has nonlinear character.