光合细菌中类胡萝卜素的提取及性质的研究

确立了光合细菌ＰＳＢ－Ｈ 的最佳提取工艺条件为：以７∶２ 的丙酮－甲醇液为溶剂，用量２５ｍ Ｌ／４０ｍ Ｌ发酵液，２ ｈ，一次浸提，再经进一步的分离和纯化，得到类胡萝卜素纯品。并对提取后的类胡萝卜素的性质进行了进一步的探讨：具有双键烯烃的一般性质，耐热性较好，需置于暗处保存，在紫外防护试验中，当其质量浓度达到０．１ ｍ ｇ／Ｌ时，就有显著的防护作用     

滹沱河河道治理堤防护岸形式及其评价

文章针对以往防护堤坝存在的问题，提出了滹沱河河道治理堤防所采用的6种断面形式及护岸控导工程布置原则，并对滹沱河上游治理堤防及护岸工程措施进行了评价。     

Cerebral ischemia revisited: New insights as revealed using in vitro brain slice preparations

Summary The elucidation of the pathophysiological mechanisms of cerebral ischemia/hypoxia dictates the use of experimental models which mimic this disabling brain condition. In vivo experimental models have been available for many decades and are responsible for the bulk of, though incomplete, knowledge we have about these mechanisms. Since study in isolation of each postulated mechanism is impossible in vivo, the need for an in vitro experimental model has intensified in recent years. Consequently, rat and guinea pig hippocampal slice preparations have emerged as the models of choice. This review attempts to highlight some of the results obtained using brain slices in the study of cerebral ischemia/hypoxia and compare them to those obtained in vivo. Both the biochemical and the physiological correlates of energy metabolism, ion homeostasis, neurotransmission and neuromodulation of this brain condition are reviewed. The agreements, and especially the disagreements, between the in vivo and in vitro findings are emphasized. Details are given of the possible roles of both lactic acid, Ca²⁺ and excitotoxins in the neuronal damage inflicted by cerebral ischemia/hypoxia. Recent attempts to protect brain slices against experimental cerebral ischemic/hypoxic damage are also reviewed here briefly.     

秦岭林区森林资源经营管护的有效途径

在全面分析秦岭林区森林资源现状的基础上,提出对森林实行科学管理、分类区划、集约经营的思路,分别不同类型采取相应的经营管理措施,充分发挥林地生产力,提高生态效益、经济效益和社会效益.     

顶吹转炉溅渣护炉工艺冷态模拟试验研究

采用水力模型的研究方法，针对某钢厂90t转炉溅渣护炉工艺进行冷态模拟试验．通过测定溅到转炉炉衬上的渣量多少，分别对顶枪枪位、气体流量、渣量等工艺参数的影响进行比较，确定最佳操作工艺参数．     

图书馆数字化建设中的版权保护

分析了图书馆数字化建设在传统文献数字化、数据库建设、数字化资源网络化传递等过程中所遇到的版权保护问题,并从法律和技术方面提出了对策和建议。     

纺织品紫外线防护性能的影响因素研究

对影响纺织品紫外线防护性能的主要因素进行了研讨。通过研究方案设计、试样制作、试样性能测试及分析，找出主要影响因素的一般影响规律，并据此分析确定了该类紫外线防护产品的设计要点。     

A New Mechanism Based on Similar Clouds Watermark for Database’s Information Security

0　IntroductionDatabase’sinformationsecurityisahotpointinrecentre searchandmostofstudiesaboutitconcentrateonDBMS(e.g .securitymodel,useridentificationandaccesscontrol,etc) .Howeverwiththedevelopmentofnetworkanddataminingtech nology ,thedataindatabaseneedsmoreandmoreeffectivecopy rightprotection[1 3] anddigitwatermarktechnologyprovidesaneffectivesolutionfortheproblem .Itbecomesanewissuetoman agethedata’scopyrightthroughdigitwatermark[4] .Digitwatermarktechnologycanconfirmthedata’sowner sh…     

燃煤电站生态效率评价方法的应用研究

煤炭在我国一次能源结构中将长期占主导地位，同时源于煤燃烧所排放的众多污染物也受到了广泛的重视．考虑可持续发展的需要，本文以能源的生态效率作为评价指标，结合我国的燃料资源情况，在前期研究工作基础上，对燃煤电站生态效率的评价方法及其影响因素进行了进一步的研究，给出了根据燃料性质、电厂效率简捷地评价SO2、NOx及CO2对电站生态效率影响程度的方法，并提出了采取减排措施时相应的指标要求．     

浅谈公路养护中的环境保护

论述了公路养护影响环境的主要因素以及应采取的保护对策。