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Fast Growth of Eucommia Antifungal Protein(EAFP) Crystals Observed by Atomic Force Microscopy
The eucommia antifungal protein (briefly named as EAFP) is an antifungal protein extracted from the barkes of the eucommia ulmoides Oliv[1]. It is involved in the defense mechanism of plants and plays an important role against the pathogenic attacks. EAFP has 41 residues distinctly with five disulfide bridges. It has been crystallized in a monoclinic form( P21 ) with the unit cell parameters a = 19. 085, b = 23. 225, c = 30. 854?, β = 98.64[2]. EAFP crystals grow much faster than most of other macromolecular crystals. It takes only several hours to grow perfect crystals big enough for x - ray diffraction at very high resolution( about 0.8?). Therefore it is very interesting to know the mechanism of the fast growth process of EAFP crystals.Here we report step growth rates measured from images by in situ Atomic Force Microscopy(AFM).
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长期低剂量电离辐射对放射工作人员血细胞参数的影响
近年来,随着放射防护技术的发展、放射工作人员防护知识的普及、自我保护意识的增强,放射工作人员在日常工作中接触的放射线剂量已处于较低水平,远远低于我国现行的<电离辐射防护与辐射源安全基本标准>(GB18871-2002)[1]中规定的职业人员年有效剂量20mSv/a的限值.为了解长期低剂量电离辐射对放射人员造血系统的影响,于2005-2008年对温州某大型医院放射工作人员及对照者的外周血象进行检测,结果报道如下.
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血管紧张素转换酶抑制剂对肾病综合征患儿红细胞参数的影响
文献报道血管紧张素转换酶抑制剂(ACEI)会加重慢性肾衰、透析、肾移植患者贫血或造成人类重组红细胞生长素(EPO)抵抗.我们探讨ACEI对肾功能正常的激素敏感型肾病综合征(NS)患儿红细胞参数的影响.