DR全脊柱成像技术应用探讨

目的探讨DR全脊柱成像技术在脊柱侧弯畸形诊断及测量中的价值,研究不同检查方法对成像质量及测量精度的影响。方法利用PHIIAPS公司Digital Diagnost DR系统和具有全脊柱拼接功能的SUN后处理工作站,对分次所摄的脊柱正位、侧位、左、右侧屈位影像进行拼接处理后作必要的测量,并打印成像。结果经上述处理后的全脊柱正位、侧位及左、右侧屈位均能将颈、胸、腰、骶椎完整联接,显示在1张14＋17的X光片上,其测量的数据真实可靠。结论DR全脊柱成像技术克服了以往颈、胸、腰、骶椎单独成像后测量上的误差,为临床手术提供了更精确的数据。     

L-谷氨酰胺生化性质、用途及生产方法概述

L-谷氨酰胺对生命的重要性正日渐突出,被认为是目前所知道的最重要的氨基酸之一,介绍了L-谷氨酰胺的生化性质及其在食品、药品等方面的用途,并对其生产方法进行归类概述。     

微载体培养技术的研究进展

本文对近年来广泛用于动物细胞培养的微载体技术的特点、培养过程的优化作了较为详细的评述。     

长江扬州段水环境保护研究

近年来 ,随着人口的增加和经济的快速发展 ,城市水环境质量在日益恶化 ,众多沿江城市正在实施或将要实施向长江干流直接排放城市污水的工程方案 ,藉以利用长江水体的环境自净能力 ,改善城市自身的水环境状况。尽管长江水量丰富 ,但随着长江扬州段供水和纳污、经济发展和生态保护的矛盾日益突出 ,所以对长江扬州段水环境进行保护研究显得格外重要。本研究的目的是既能发展扬州经济 ,满足人民的基本需要 ,又不超出水环境的允许极限[1 ] ,充分合理的利用开发水资源。1　水环境现状长江扬州段水环境的作用举足轻重 ,除作为饮用水源外 ,兼有排污…     

埋植17α—甲基睾酮诱导点带石班鱼性转化技术

论述了埋植17α-思虑在睾酮诱导点带石斑鱼（Epinephelus malabaricus)性转化的方法,包括药物的处理,用量,手术操作等3龄的雌性点带石班鱼经过2次埋植外源激素手术转化为功能性雄鱼,139d后58％可挤出精液,301d后100％可挤出精液,功能性雄鱼用于人工繁殖,亲鱼自然产卵,1999－2000年2年内共孵出存鱼7103万尾,所得仔鱼用鱼苗培育,得到发育正常的幼鱼,认为埋植外源激素诱导点带石斑鱼完成性转化的方法简便可行,能满足规模化人工繁殖的需要。     

MHC class I multimers

T lymphocytes play a key role in the immune response to both foreign and self peptide antigens, which they recognize in combination with MHC molecules. In the past it has been difficult to analyse objectively the specificity, frequency and intensity of T cell responses. The recent application of fluorescent-labelled MHC class I multimers, however, has provided a powerful experimental approach to the direct visualisation of antigen-specific T cells. As a result, our perspective of how T cells respond to both viruses and other antigens in vivo has been greatly enhanced.     

Methodologic challenges in chronic disease population research

Some recent important, and controversial, chronic disease population research settings are reviewed. These include studies of hormone replacement therapy and coronary heart disease; studies of dietary fat in relation to breast cancer; and studies of beta-carotene supplementation and lung cancer. In each case methodologic developments having a strong biostatistical component are identified as key to future progress. Some comments are also made on the need for an expanded disease prevention intervention development enterprise, and on the role that microarray genetic and genomic data may play in such development.     

The role of chitosan in wool finishing

The application of the biopolymer chitosan as an alternative to the conventional contaminating processes in textiles was studied. As chitosan is produced by biomass, it is biodegradable and bioadsorbable. These properties are increasingly important given the current environmental legislation. The main aim of chitosan treatment of oxidised wool fabrics is to improve felting properties and dyeing behaviour.     

Tool-using strategies by early hominids at bed II, Olduvai Gorge, Tanzania

This study examines the current prevailing model of Oldowan technology-the opportunistic, least-effort strategy of stone tool making and using by early hominids. The sample includes the MNK chert factory site and three contemporaneous assemblages from Olduvai Gorge, all dated between 1.65 and 1.53 m.y.a. The analysis suggests that early hominids at Olduvai may have been selective, applying distinctive strategies in making and using tools depending on the different types of raw materials available to them. The preponderance of lava cores and near absence of flakes associated with the cores suggest that lava cores at Olduvai did not provide a source of flakes. They were primarily heavy-duty core tools, despite the fact that the majority of Olduvai lava is of excellent quality for flaking. Contrary to this pattern, the abundance of chert flakes and the lack of large chert cores suggest that the production of flakes was the most important strategy applied to chert. Original forms and flaking mechanics of the raw materials may have been important factors in the simultaneous application of the different, complementary strategies. The Oldowan tool-using strategy was dynamic and flexible, in response to changes in raw material availability. The use of chert between 1.65 and 1.53 m.y.a. was apparently related to the drastic decrease in flake production in lava and quartz. Finally, lack of initial reduction episodes of lava material challenges the idea of the stone cache strategy at Olduvai between 1.65 to 1.53 m.y.a.