生物过滤技术在大气污染控制中的使用价值

目前，生物过滤技术被广泛应用于大气污染控制领域，做好技术方案的优化选择，就能够充分发挥该技术降本增效的重要价值。文章首先分析了大气污染控制的现状，然后阐述并研究了目前生物过滤技术的应用方法，通过优化设计控制系统、合理选择生物滤料、采取双层生物过滤塔等技术方案，使大气污染的控制效果更加理想，可为行业相关人员提供技术参考。     

生物过滤床净化含乙苯废气的温度影响分析

以两种陶粒作为生物过滤床的填料净化含乙苯废气。主要考察温度变化对生物过滤塔净化含乙苯废气效果的影响。在稳态条件下,在温度为15~25℃时,乙苯的去除效率随运行温度的升高而升高,在25~45℃时,乙苯的去除效率随温度升高而降低。并通过实验得出了温度系数。结果表明,对于零级反应,温度对高入口体积负荷的影响较低入口体积负荷的影响大,而对于一级反应,则出现了相反的结果。同时也表明不同填料对温度系数的影响不显著。     

美国生物产业融资状况、特点与趋势分析

美国资本市场是全世界交易最活跃、融资额最大、最健全成熟的市场。美国资本市场在生物产业的发展中起到了举足轻重的作用。同时 ,美国生物产业在全球生物产业中占有约 70 %的比重 ,是生物产业的发祥地 ,故美国生物企业的融资历程足以说明全球生物产业的融资历程。分析研究了美国生物产业融资状况、特点及几种新型的融资方式。     

纳米乳剂在生物恐怖防护中的应用

由于军事环境的改变和生物技术的发展,生物恐怖已成为本世纪极大的威胁。采用新技术防范生物恐怖袭击是生物反恐的重要课题。本文对新型纳米乳剂的概念、特点及在生物恐怖防护中的应用作了概要介绍。     

生物计算公式

笔者在多年的高中生物教学过程中,归纳总结了一些生物计算公式。教学实践证明,利用这些生物计算公式来解答有关生物计算题,具有简捷和准确的特点。现将部分生物计算公式介绍如下: 一、有关蛋白质的计算公式 1.已知缩合成某种蛋白质的氨基     

浅谈现代生物技术在各行业的使用现状

生物处理法不仅是现今水处理技术中最为主要的方法,它还将作为现代生物技术的重点被运用到水污染控制领域和技术手段中。本文在简述了现代生物技术的内容与特点的基础上,重点阐述了其在水热污染处理和生物修复水体以及微生物处理剂等个方面的现状与研究进展。并以此提出了现代生物技术今后在水污染处理的研究内容和重点规划方向。     

巴西生物燃料政策及对我国的启示

巴西是世界上最早推行生物燃料政策的国家之一,目前已成为世界上第二大乙醇生产国和最大的乙醇出口国。本文简介了巴西推行生物燃料政策的背景、发展生物燃料的优势,详述了其生物燃料的政策特点和政策收益,以及对我国发展生物燃料的启示。     

荧光纳米生物传感器研究进展

荧光纳米生物传感器检测物质具有灵敏度高、响应迅速、抗干扰性强、无需参比电极等特点而被广泛地运用于生物传感技术领域。本文综述了荧光纳米生物传感器种类和特点,介绍了国内外近期在荧光纳米生物传感器及在生物检测方面的一些研究成果及进展,并作了分析比较。着重讨论了纳米粒子荧光生物传感器和光纤纳米荧光生物传感器的特性及其在生物分析中的应用。     

生物信息数据库知识产权保护初探

生物信息技术是当今生命科学乃至整个自然科学的重大前沿领域之一,生物信息数据库是生物信息技术中非常重要的部分,对生命科学的发展起着重要的推动作用。本文叙述了生物信息数据库的特点及国内外知识产权保护现状,初步讨论了生物信息数据库知识产权保护中存在的问题,提出了保护我国生物信息数据库的建议。     

生物正交化学在活体标记及药物传递中的研究进展

生物正交化学反应是一类可以在生理条件下发生的化学反应,具有简单、高效、高特异性的特点,在生物医学的研究中被广泛应用.基于生物体天然生命过程的代谢工程,可对生物分子进行无损、高效的生物代谢修饰,是一种理想的生物修饰技术.通过生物代谢途径可有效地将各种化学报告基团引入靶标物的生物分子中,有利于携带配对基团的标记物与其发生生物正交反应,从而在活体系统中实现生物分子的标记示踪和药物递送.这种基于代谢工程与生物正交化学的标记策略因为具有两者之间的优势,在生物医学工程中的标记、成像示踪、诊断等领域展现出巨大的研究价值与应用潜力.本文介绍了生物正交和代谢工程的原理与生物医学研究进展,阐述了生物正交化学在分子成像和药物传递等方面的研究与应用.     

Succinate dehydrogenase – Assembly,regulation and role in human disease

Succinate dehydrogenase (or Electron Transport Chain Complex II) has been the subject of a focused but significant renaissance. This complex, which has been the least studied of the mitochondrial respiratory complexes has seen renewed interest due to the discovery of its role in human disease. Under this heightened scrutiny, the succinate dehydrogenase complex has proven to be a fascinating machine, whose regulation and assembly requires additional factors that are beginning to be discovered. Mutations in these factors and in the structural subunits of the complex itself cause a variety of human diseases. The mechanisms underlying the pathogenesis of SDH mutations is beginning to be understood.     

Studies on Nitrogen Fixation by Blue-green Algae: II. NITROGEN FIXATION BY MASTIGOCLADUS LAMINOSUS COHN

Mastigocladus laminosus Cohn, a blue-green alga of hot springs,has been obtained in pure bacteria-free culture and has beenshown to be capable of fixing elementary nitrogen. This appearsto be the first instance in which this capacity has been demonstratedin a blue-green alga belonging to a family other than the Nostocaceae.     

ARE RECENT DEFENCES OF THE BRAIN DEATH CONCEPT ADEQUATE?

Brain death is accepted in most countries as death. The rationales to explain why brain death is death are surprisingly problematic. The standard rationale that in brain death there has been loss of integrative unity of the organism has been shown to be false, and a better rationale has not been clearly articulated. Recent expert defences of the brain death concept are examined in this paper, and are suggested to be inadequate. I argue that, ironically, these defences demonstrate the lack of a defensible rationale for why brain death should be accepted as death itself. If brain death is death, a conceptual rationale for brain death being equivalent to death should be clarified, and this should be done urgently.     

STUDIES IN RESPIROMETRY : I. A COMBINED GAS BURETTE-INTERFEROMETER RESPIROMETER

A machine has been described which combines volumetric and refractometric means of observing changes in carbon dioxide and oxygen concentrations and amounts in a closed system suitable for containing a respiring system. A means of thermoregulation has been described briefly. The theory upon which estimation is based has been outlined in considerable detail and generality; indicating how dependence upon absorption of gases by reagents can be eliminated completely, although they may be used in certain instances as a means of independent check. An experiment of this nature has been reported as an illustration of one use of the machine. Data of other experiments in which a moist environment was employed for the respiring system will be given in another communication.     

CHANGING EPIDEMIOLOGIC ASPECTS OF TYPHOID FEVER IN CALIFORNIA

Typhoid fever in California is no longer a major public health problem. The previously high incidence of water- and milk-borne infections has been greatly reduced. Human carriers now are the source of most infections.Chloramphenicol has proven to be a valuable aid in the therapy of the acutely ill patient, but it has not as yet solved the therapeutic or public health problems of typhoid fever. It continues to be vital for the protection of the public that every suspected case of typhoid fever be definitely established by appropriate public health laboratory procedures, that thorough investigation be carried out to determine the source of infection, and that careful follow-up examinations be done so that if a carrier state develops, proper measures can be taken.     

新型蛋白质配体-亲和体研究进展

亲和体(affibody)是一种衍生于葡萄球菌A蛋白B结构域的人工蛋白质分子．B结构域含58个氨基酸,形成3个α螺旋结构,分子质量约为6.5 ku．其中第一及第二螺旋中的13个特定位点的氨基酸对其结构无明显影响,这些位点可被随机突变形成理论上可与任何靶分子结合的亲和体文库．筛选该文库可获得能与某一靶分子特异结合的亲和体．亲和体与靶分子的结合特性与抗体相似,但与抗体相比具有一些独特的优势,如：通过体外筛选即可获得,以化学合成方法或原核表达即可大量制备,分子质量小、在生物体内组织穿透性强、血浆清除率高,理化稳定性好,可以通过交联或融合表达与标记分子(如荧光蛋白、生物素等)结合而不影响其与靶分子的结合能力．亲和体可作为抗体的替代品,用于蛋白质识别、分离及纯化、实验诊断、分子显像及靶向治疗．     

PRISONER RESEARCH – LOOKING BACK OR LOOKING FORWARD?

Much has been written about prisoner research and the controversies surrounding prisoners as human subjects. The Institute of Medicine recently released a report addressing some of these issues. This report, which generated further controversy, needs to be fully discussed in the literature and certain aspects are examined in this work. Further, in the body of literature there has been little acknowledgement of the concept of the right of prisoners to be involved in research. This needs to be pursued from an ethical perspective and eventually a legal one. This paper explores that concept and documents some facilities in which a prisoner's right to research has occurred.     

A tale of two snails: is the cure worse than the disease?

The giant African snail, Achatina fulica, has been introduced to many parts of Asia as well as to numerous islands in the Indian and Pacific Ocean, and has recently reached the West Indies. It has been widely decried as a disaster to agricultural economies and a threat to human health, leading to a clamor for the introduction of biological control agents. In fact, the lasting impact on agriculture may not be severe, and the human health risk is probably minor. This snail can be an aesthetic atrocity and a nuisance in other ways, however. Wherever A. fulica has achieved high densities, it has subsequently undergone a striking decline. Although this decline has been attributed to introduced predators, there is little evidence for this hypothesis; instead, epizootic disease seems to be at least part of the cause. However, the introduced predators, especially a New World snail, Euglandina rosea, have wrought havoc with the native land snails of many islands. They have already caused many extinctions and will almost certainly cause others. This predator was introduced by government agencies in many areas despite warnings from competent biologists that the effects could be disastrous. Pressures for such actions may become overwhelming in the face of a highly visible invasion, despite policies that should mandate extreme caution.     

Population dynamics of mitochondria. I. A model for the role to ACTH in the degradation of adrenocortical mitochondria

An allosteric substance has been supposed to be present in the adrenocortical cell and to be involved in the degradation of the adrenocortical mitochondria only when it is present in the cytoplasm as a free form. An allosteric effector has also been assumed to be synthesized in the adrenal cortex strongly depending on the ACTH supply. The allosteric effector combines hypothetically with the allosteric substance to form an association product. In its bound form, the allosteric substance is assumed to be inactive in the degradation reaction of mitochondria. With these assumptions a differential equation has been obtained to describe the decay process of those mitochondria. An algorithm has been developed to compute the dynamical fate of the mitochondria in a simple, iterative way. Experimental results on the mitochondrial decay in the rat adrenal cortex after hypophysectomy have been fitted to the differential equation in a satisfactory manner. It has been stressed that the present hypothesis constitutes in its essence a new working hypothesis on the maintenance of adrenocortical mitochondria under normal physiological conditions.