三峡库区克山病产生的地理环境分析

为了探明三峡库区克山病的发病机理,作者选定库区几个重病区进行了病情与生态环境的分析,首先通过对库区病区的自然地理环境特点和化学地理特点的剖析,初步证实了克山病高发病区多为贫硒环境。然后根据统计资料对土壤中硒等生命元素与病情进行多元逐步回归分析,得出一系列的元素组合判别式,其中,硒始终是病因产生的主导因素,这更进一步的映证了以前的研究结论:即环境中硒缺乏是导致克山病早期病变的基本因素。最后提出了克山病防治措施。     

微量元素硒及其测定方法

本文评述了1988－1996年我国有关硒分析的研究动态，内容包括荧光分光光反法、原子吸收光谱法、催化分光光度测定法、电分析法及硒的形态分析等，共引用文献63篇。     

微孔滤膜富集分光光度法测定痕量硒

本文介绍了Ｓｅ（Ⅳ）与硫氰酸盐和罗丹明Ｂ形成三元离子缔合物，通过微孔滤膜富集，用二甲基亚砜将膜及缔合物溶解，在分光光度计上测量吸光值，从而测得痕量Ｓ（Ⅳ）的方法．缔合物最大吸收波长为５８０ｎｍ，Ｓｅ含量在０～２μｇ·ｍｌ－１范围内遵从比耳定律．本方法灵敏度高，表观摩尔吸光系数ε５８０＝２．０×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，且稳定性高，重现性好     

富硒鲍鱼菇的深层培养及其特性

报导在含有不同浓度无机硒的液体培养基中培养鲍鱼菇菌丝体，探讨其耐硒和富硒特性。结果表明：鲍鱼菇有较强的耐硒特性和很强的富硒能力，鲍鱼菇菌丝体硒含量随培养基质硒浓度的增加而增高，在培养基中添加硒量为５μｇ／ｍｌ时，富硒鲍鱼菇菌丝体含硒量可达２００μｇ／ｍｌ时，为对照的４０倍，硒回收率达３８．８％，其氨基酸及多糖含量均高于对照。     

微量元素硒的微生物转化研究进展

介绍微量元素硒的生物学功能,通过阐述利用微生物的特殊生物转化能力进行硒的微生物转化的现状和发展趋势,提出从高硒地区筛选野生富硒食用蕈菌资源,开展微生物的硒富集规律,并进行硒的微生物转化的研究方向.     

富硒乳酸菌抗肝损伤小鼠红细胞脂质过氧化作用

选择60只健康雌雄对半成年小鼠，随机分成对照组(C组)，富硒乳酸菌组(Se组)，CCl4-富硒乳酸菌组(CCl4-Se)，CCl4注射组(CCl4组)，通过腹腔注射CCl4诱发肝损伤，分别在第2、4、6周采集血样并测定红细胞溶血液中GSH-Px、GST和SOD活性及MDA含量．研究富硒乳酸菌对CCl4诱发肝损伤小鼠红细胞脂质过氧化损伤的保护作用．结果显示，在整个实验期内，SOD各组间未见明显差异；GST表现为Se组最高，呈上升趋势，且在第6周高于或明显高于其他符组，CCl4组低于或明显低于C组和CCl4-Se组，C组和CCl4-Se组相近；C组、Se组和CCl4-Se组GSH—Px活性无明显差异，而CCl4组随负荷时间呈下降趋势，第4周后明显低于其余三组．C组和CCl4-Se组的MDA无明显差异，Se组整体水平低于或明显低于其它三组，CCl4组高于或显著高于其它三组．提示CCl4诱发肝损伤小鼠红细胞脂质过氧化变化剧烈，富硒乳酸菌制剂能通过抗损伤保护以及增强抗氧化酶活性发挥有效作用．     

清中后期社会历史文化心态的展现——以小说《荡寇志》为例

《荡寇志》是清中后期保守士人面对西潮涌入、传统文化失落的集体性情感反应的产物,小说作者俞万春以捍卫中国传统文化的基本价值为己任,担负起了文化卫道的使命。但残酷的现实却撕碎了他加强君权、帝制,肃清内乱来重振国威的卫道美梦,小说《荡寇志》便展示了这一特定历史时期各种社会变革思潮下的社会历史文化心态。     

Description of rotational properties of the superheavy nucleus ^256,258,260Rf by projected shell model

Band structure of the Z = 104 nucleus 256Rf has been a recent research focus in nuclear physics. We performed projected shell model calculations for this and some other neighboring Rf isotopes. Specifically, we studied rotational properties of these nuclei and showed that variations in dynamic moment of inertia were sensitive to single-particle structures, which may be useful information for locating the anticipated island of stability. Electromagnetic transition properties were also calculated, and measurable quantities were predicted for further experimental test.     

DanHong Injection inhibits the development of primary abdominal aortic aneurysms in apoE knockout mice

Clinical observations indicate that DanHong Injection （DHI） can increase blood flow and reduce various syndromes in patients with cardiovascular disease. How- ever, it still needs to define the function of DHI and the involved mechanisms in details, such as the protective effect on the development of primary abdominal aortic aneurysms （AAAs）. In this study, we determined whether DHI is able to inhibit AAA in apoE knockout （apoE-/-） mice. Thirty apoE-/- male mice on high-fat diet （0.5 % cholesterol, 21% fat） were randomly divided into two groups and received i.p. injection of saline （100 μL/day） and DHI （100 μL/day）, respectively, for 16 weeks. At the end of experiment, we determined the development of atherosclerosis in en face aorta and aneurysms,pathological morphology of arterial wall, and serum lipid levels. We also determined the expression of monocyte chemoattractant protein-1 （MCP-1）, MMP-2, and MMP-9 mRNA in aortic wall using real-time RT-PCR. Our results indicated that high-fat diet induced the development of AAAs in apoE-/- mice, but the induction was totally blocked by DHI （P 〈 0.01）. The result of staining of abdominal aortic cross sections showed that DHI main- tained the collagen content in arterial wall, thereby pre- venting the animals from the development of AAA. Although DHI had little effect on serum total- and LDL- cholesterol levels, it reduced the expression of MCP-1, MMP-2, and MMP-9 mRNA in aortic wall （P 〈 0.01）. Taken together, our study suggests that DHI can inhibit the high-fat diet-induced AAA formation. The inhibitory effects may be related to the maintenance of the collagen content and inhibition of expression of AAA-related genes. Our study may suggest a new application of DHI in clinics.     

(λ,μ)-模糊粗糙子群

本文根据(λ,μ)-模糊正规子群定义了新的同余关系,由此提出了(λ,μ)-模糊粗糙子群和(λ,μ)-模糊粗糙正规子群的概念,并研究了它们的性质.