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白马雪山自然保护区滇金丝猴数量分布及种群结构的初步观察 总被引:7,自引:1,他引:6
滇金丝猴(Rhinopithecus bieti)属于世界珍稀灵长类动物,对它的研究报道仅限于分类地位(彭鸿绶等,1962;彭燕章等,1985;陈服官等,1981)、形态解剖(陈宜峰,1981;彭燕章等,1983;张耀平等,1983)、地理分布及生活习性(李致祥等,1981;木文伟等,1982)等。其分布、数量以及进化地位、生态学等方面的资料甚少。1985年笔者在白马雪山自然保护区对滇金丝猴的数量、分布及种群结构进行了观察。 相似文献
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贝类上诱发的三倍体及其应用前景 总被引:1,自引:0,他引:1
近几年来,利用染色体工程在贝类上进行育种的研究有了很快的进展(Stanley等,1981、1984;Allen等,1982、1986、1988;Tabarini,1984;Quillet等,1986;Downing等,1987;Arai等,1986;Standish等,1986;古丸明,1987;Komaru等,1988;和田克彦,1987;姜卫国等,1987;Fujino等,1987;藤野和男, 相似文献
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关于我国的鸟类血吸虫,以往有过Faust(1924)、大礒(1927)、吴光(wu,1937)、唐仲璋(Tang,1951)、包鼎成等(1957)、龚建章等(1960,1963)、唐仲璋等(1962)、蔡尚达等(1962,1965)、刘兆铭等(1963)、白功懋等(1963)、易道善等(1963)、黄舜毅等(1965)、吴海林等(1965)、罗汉超等(1965)的报告。 鸟类血吸虫的尾蚴能引起人的皮炎,已是众所周知。我们在进行吉林省稻田皮炎病原调查时,曾在各地的螺中多次发现具眼点的无咽短尾叉叉尾尾蚴。考虑到鸟类血吸虫的尾蚴可能是稻田皮炎病原体,曾检查了经常出入稻田的野鸭,发现野鸭(特别是斑嘴鸭 相似文献
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利用细胞培养技术提高次生代谢物的产量 总被引:3,自引:0,他引:3
次生代谢物是植物体代谢的最终产物,由糖类、脂肪和氨基酸等有机物代谢衍生而来,储存在液泡或细胞壁中。我们知道的吲哚乙酸、赤霉素等植物激素,胡萝卜素、花青素等色素,奎宁碱、小檗碱、皂甙等药物以及橡胶等工业原料,都是重要的次生代谢物质。40年代后期,Bon... 相似文献
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《微生物学杂志》1989,(4)
研究报告鹅))))页 1 6 1(H 了之、护砚、矛‘、了.、作者姓名孙志敏等周崇莲等马秀贞等李宪臻等卷期9卷1期9卷l期9卷1期9卷1期、刃产‘、产、、了、Z‘、‘工、1产‘、尹、.产只︺通‘,人L}月脸004引公段19卜州公了‘,了r‘、r、2.‘、尹r.、产‘产﹄产‘、了、,尹、J产、、产‘、了、、声、.声,30 35 1 3 7 1215矛‘Z‘、了‘、了‘、︸了、了‘、尹r、高东等向世华等谷安筑等黄海华等孙志敏等唐欣均等周东坡等解思泌等赵福林等戴祥鹏等张忠泽等鲁志新等张道海等9卷工期9卷1期9卷1期9卷2期9卷2期9卷2期9卷2期9卷2期9卷2期9卷2期g卷3期9卷… 相似文献
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系统生物学是系统理论和实验生物技术、计算机数学模型等方法整合的生物系统研究,系统遗传学研究基因组的稳态与进化、功能基因组和生物性状等复杂系统的结构、动态与发生演变等。合成生物学是系统生物学的工程应用,采用工程学方法、基因工程和计算机辅助设计等研究人工生物系统的生物技术。系统与合成生物学的结构理论,序列标志片段显示分析与微流控生物芯片,广泛用于研究细胞代谢、繁殖和应激的自组织进化、生物体形态发生等细胞分子生物系统原理等。 相似文献
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锂离子电池层状正极材料的研究进展 总被引:1,自引:0,他引:1
从结构、性能、合成工艺及其应用等方面,综述了锂离子电池正极材料LiCoO2、LiNiO2及其衍生物的研究进展。着重介绍了LiNi1-xCoxO2材料的合成方法、电化学性能及其改性的最新成果。 相似文献
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Ottilia de Marco Giovanni Lagioia Elsa Pizzoli Mazzacane 《Journal of Industrial Ecology》2000,4(2):55-70
This article analyzes the mass of the materials that flowed through the Italian economy during 1994 and compares the results with a similar analysis of Germany, Japan, the Netherlands, and the United States published by a collaboration headed by the World Resources Institute. In order to perform this comparison, we have evaluated the mass of the materials produced within the country and the mass of the imported materials and commodities. For the domestic production, imports and exports, we have also evaluated the mass of the materials that accompany—as "hidden flows"—each physical flow.
Our analysis indicates that, in 1994, Italy experienced total material requirements (TMR) of 1,609 million metric tons (Mt), of which 727 Mt was used as direct material input (DMI). A comparison with other developed countries shows that the TMR and DMI flows, measured in mass per person and in mass per GDP unit, are, in Italy, lower than the corresponding figures evaluated for the United States, Germany, and the Netherlands. An interpretation of these results is presented. The analysis may give information useful for environmental considerations, although the limits of such an approach are made clear. 相似文献
Our analysis indicates that, in 1994, Italy experienced total material requirements (TMR) of 1,609 million metric tons (Mt), of which 727 Mt was used as direct material input (DMI). A comparison with other developed countries shows that the TMR and DMI flows, measured in mass per person and in mass per GDP unit, are, in Italy, lower than the corresponding figures evaluated for the United States, Germany, and the Netherlands. An interpretation of these results is presented. The analysis may give information useful for environmental considerations, although the limits of such an approach are made clear. 相似文献
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目的了解实验所用常见致病真菌能否在常用医用原材料上生存及生存时间。方法选择8种常见致病真菌,活化后将它们分别接种在5种常用的医用原材料上,接种后及以后的每24h将接种有真菌的医用材料放入巯基乙酸盐液体培养基中并观察能否生存,记录存活时间。结果红色毛癣菌和须癣毛癣菌在棉布、纸板、铁皮、玻璃表面存活25~28d,在地板胶表面存活14~15d;新生隐球菌在棉布、纸板、铁皮表面存活24~27d,在玻璃和地板胶表面存活14~18d;茄病镰刀菌在上述5种材料上存活22~27d;石膏样小孢子菌在棉布、纸板、铁皮和玻璃表面存活20~27d,在地板胶表面存活8d;申克孢子丝菌在棉布、纸板、玻璃和地板胶表面存活17~24d,在铁皮表面存活10d;白念珠菌在棉布、纸板、铁皮和地板胶表面存活15~20d,在玻璃表面存活4d;犬小孢子菌在棉布、纸板、铁皮、玻璃和地板胶上存活时间分别为10d、9d、3d、2d和1d。结论实验所用各种真菌在医用原材料上都能存活,其时间长短不仅与菌种有关,还与所存在的材料有关。真菌在吸水性强、表面粗糙的材料(棉布、纸板)上的平均存活时间长于在吸水性差、表面光滑的材料(玻璃、铁皮和地板胶)。 相似文献
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张东宪毕龙孙鹏霄卢旭韩一生 《现代生物医学进展》2012,12(15):2974-2977
随着关节韧带损伤发生率日益提高,人工材料植入重建韧带功能是重要治疗手段之一。植入后宿主细胞的趋向、黏附和迁移是人工材料在体内形成长期稳定生物连接的关键。以往研究集中于提高材料生物性,如增加材料亲水性、表面修饰、黏附适宜细胞以及复合细胞因子等,目前在张力环境下三维微孔结构对宿主细胞黏附、迁移、长入和分化影响的研究较少。本文拟以生物相容性良好的聚对苯二甲酸丁二醇酯(PET)材料作为载体,探讨在张力状态下新编PET的结构、孔径大小和孔隙率对细胞迁移等细胞生物学行为影响的研究现状和未来发展。为这些研究的深入指明方向,也为PET作为人工材料修复韧带损伤的临床应用奠定实验基础。 相似文献
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Zuoqi Zhang Yong-Wei Zhang Huajian Gao 《Proceedings. Biological sciences / The Royal Society》2011,278(1705):519-525
Load-bearing biological materials such as shell, mineralized tendon and bone exhibit two to seven levels of structural hierarchy based on constituent materials (biominerals and proteins) of relatively poor mechanical properties. A key question that remains unanswered is what determines the number of hierarchical levels in these materials. Here we develop a quasi-self-similar hierarchical model to show that, depending on the mineral content, there exists an optimal level of structural hierarchy for maximal toughness of biocomposites. The predicted optimal levels of hierarchy and cooperative deformation across multiple structural levels are in excellent agreement with experimental observations. 相似文献
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The purpose of the present research was: 1. To investigate the opportunity of application of allogen osteoplastic materials such as Lioplast, received in Samara Tissue Bank of Samara State Medical University. 2. To work out a new technique of producing lyophilized allogen osteoplastic materials, such as Lioplast, with application of an ultrasonic method of clearing. 3. The development of various techniques of operative intervention on jaws for increase in volume of atrophied, as a result of secondary adentia, alveolar shoot. 4. The application of spongy allogen osteoplastic material as a skeleton for filling in surgical operations on jaws. 5. The demonstration of the Technique of a bone-periostic Lioplast 'sandwich' for formation of an alveolar shoot. 相似文献
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Katsuhiro Hosoyama Manuel Ahumada Keshav Goel Marc Ruel Erik J. Suuronen Emilio I. Alarcon 《Biotechnology advances》2019,37(3):444-458
In many diseases, tissue regeneration is compromised and/or insufficient to restore tissue/organ function. Therefore, novel regenerative therapies are being developed to enhance resident and transplanted cell proliferation and functional differentiation. Numerous biomaterials engineered to include nanocomponents have emerged as promising candidates to fulfil the need of mimicking the properties of the healthy extracellular matrix. This is particularly important for tissues that require electroconductive support to achieve optimal cellular function, such as muscles and neurons. In this review, we summarize and discuss the current state-of-the-art for electroconductive materials in tissue regeneration, with particular emphasis on materials containing nanocomponents. 相似文献
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Chihiro Kayo Sbastien M.R. Dente Chika Aoki‐Suzuki Daisuke Tanaka Shinsuke Murakami Seiji Hashimoto 《Journal of Industrial Ecology》2019,23(3):635-648
In this study, we used material flow analysis and life cycle assessment to quantify the environmental impacts and impact reductions related to wood consumption in Japan from 1970 to 2013. We then conducted future projections of the impacts and reductions until 2050 based on multiple future scenarios of domestic forestry, wood, and energy use. An impact assessment method involving characterization, damage assessment, and integration with a monetary unit was used, and the results were expressed in Japanese yen (JPY). We found that environmental impacts from paper consumption, such as climate change and urban air pollution, were significant and accounted for 56% to 83% of the total environmental impacts between 1970 and 2013. Therefore, reductions of greenhouse gas, nitrogen oxide, and sulfur oxide emissions from paper production would be an effective measure to reduce the overall environmental impacts. An increase in wood use for building construction, civil engineering, furniture materials, and energy production could lead to reductions of environmental impacts (via carbon storage, material substitution, and fuel substitution) amounting to 357 billion JPY in 2050, which is equivalent to 168% of the 2013 levels. Particularly, substitution of nonwooden materials, such as cement, concrete, and steel, with wood products in building construction could significantly contribute to impact reductions. Although an increase of wood consumption could reduce environmental impacts, such as climate change, resource consumption, and urban air pollution, increased wood consumption would also be associated with land‐use impacts. Therefore, minimizing land transformations from forest to barren land will be important. 相似文献
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土壤有机质和外源有机物对甲烷产生的影响 总被引:27,自引:2,他引:25
对土壤有机质含量及组分、外源有机物和根系分泌对甲烷产生的影响作了综述。土壤产甲烷量和甲烷排放量随有机质含量增加而提高,与土壤中易矿化有机碳或沸水浸提有机碳含量呈显著相关。外源有机碳加入促进了土壤排放甲,刺激效果与外源有机碳的用量和组成有关。还原力强的有机物如纤维素和半纤维素较还原力弱的有机物如类脂和多糖能够产生更多的甲烷。甲醇、甲基化氨基酸等无其它微生物竞争利用的有机物能被产甲烷菌更多地转化成甲烷。植物根系分泌物也促进甲烷的产生,促进作用大小与植物种类及分泌物的数量和质量有关。外源有机物通过3种方式促进土壤甲烷产生;提高土壤的甲烷底物供应量,降低土壤氧化还原电位,刺激土壤原有有机碳的转化。 相似文献