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概述
随着社会经济逐步向前发展．生化分析仪作为直接检测人体生化指标的设备,其结果的准确性和可靠性对诊断疾病有非常重要的意义。生化分析仪吸光度误差的测量方法是以蒸馏水作为参比溶液．校正仪器吸光度的零点,在340nm波长测定生化分析仪吸光度标准物质的吸光度值．重复测量3次．3次测量值的算术平均值减去相应标准物质的标准值即吸光度示值误差。生化分析仪波长误差的测量方法是用被测生化分析仪直接测标准滤光片或用紫外分光光度计测量生化分析仪的滤光片的吸收峰波长值,重复测量3次．3次的算术平均值与标准波长之差值,即为波长示值误差。其测量依据是JJG464-2005《生化分析仪》。 相似文献
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针对被柴油污染的土壤,研制一种简便宜用的办法测量土壤中柴油的含量。根据石油组成中所含的具有共轭体系的物质在紫外光区有特征的吸收峰,而在该吸收峰下不同量的柴油对应不同的吸光度,由柴油和吸光度的一一对应关系,通过实验确立二者之间的线性关系。利用这个关系式,测得不同量柴油的吸光度,得到柴油的实际量。 相似文献
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目的:建立紫外分光光度法测定蒲公英中总有机酸的方法.方法:以乙醇为溶剂提取蒲公英中的咖啡酸,采用紫外分光光度法于763nm处测定咖啡酸的含量.结果:咖啡酸的质量在2μg/ml-10μg/ml范围内与吸光度有良好的线性关系(r=0.9997).平均回收率为95.0%,RSD=1.2%.结论:该方法简便,灵敏,结果可靠. 相似文献
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用紫外可见分光光度法测定共轭亚油酸的含量 总被引：17，自引：0，他引：17
采用UV 91 0 0型紫外可见分光光度计,测定了共轭亚油酸、共轭亚油酸甲酯、共轭亚油酸三甘酯在不同浓度时在 2 0 0～ 3 0 0nm的吸光度,绘制出样品在不同浓度时的吸光度曲线,找出适宜的浓度范围;用MicrocalSoftwareOriginVersion 4.0做回归分析,由线性回归给出样品浓度和吸光度的线性关系;利用PEAutosystemXL TurboMass测得样品中共轭亚油酸乙酯的准确浓度,结合回归系数给出了测定样品中共轭亚油酸含量的经验公式. 相似文献
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当今,太阳能电池成为全球能源可持续发展的重要内容。本文以太阳领域的5个代表性期刊中2001-2014年公开发表的文献为研究对象,利用信息可视化方法,探测了太阳能电池领域近十年发展历程中关键技术和潜在技术,研究得出当前太阳能电池领域研究主要集中在光电转换材料、电池片制造加工以及可靠性3个方面;不同代际的太阳能电池处于不同的技术生命周期阶段;潜在关键技术主要包括:基于材料吸光度的多层结构设计,薄膜电池片规模化制造技术,聚合物太阳能电池的维护与延寿。 相似文献
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SDS法和CTAB法提取西藏黄籽油菜干种子DNA用于SSR分析 总被引：1，自引：0，他引：1
选用8个西藏黄籽油菜干种子作材料,分别采用SDS和CTAB的微量法提取基因组DNA,取适量的该DNA进行琼脂糖凝胶电泳,并利用uv1100型紫外分光光度计测定所提取的DNA在260nm、280nm的光密度值及比值,并进行SSR标记。结果表明,2种方法均能从西藏黄籽油菜干种子中提取出一定量的比较完整且纯度较高的DNA,用琼脂糖凝胶检测时,表现带型清亮,每个样品带型较一致,利用SDS法CTAB法提取西藏黄籽油菜干种子DNA,均适用于SSR分析。但用CTAB法提取的干种子DNA的纯度更高、量多、质量更好,更适于制备SSR分子标记的模板DNA。 相似文献
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采用不同的提取方法对杜仲叶进行提取,并使用紫外分光光度法对提取物中的黄酮进行测定。检测波长为500nm,平均回收率为98.99%,RSD=1.9%结果表明酶解法提取含量最高。 相似文献
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Vijay Navghare Shashikant Dhawale 《Indian journal of clinical biochemistry : IJCB》2016,31(4):380-389
Musa cavendish, peels has local and traditional use to promote wound healing, hyperglycemia, ulceration etc. The present work investigated the lipid lowering; nephroprotective and glucose lowering properties of ethanolic extract of peels of Musa cavendish (EMC) in alloxan-induced diabetic rats. The EMC 250, 500 and 1000 mg/kg/day and the vehicle were administered orally to alloxan-induced diabetic rats (n = 6) for 3 weeks. Changes in plasma glucose, lipid profile along with kidney function before and after treatment with EMC were recorded. The ethanolic extract of peels of Musa cavendish reduced blood glucose, serum triglyceride, cholesterol, LDL cholesterol and creatinine levels and improvement in body weight, liver glycogen, serum HDL cholesterol, serum albumin and total protein level when compared with untreated rats. Musa cavendish has lipid lowering, nephroprotective and antidiabetic property by regulating glucose uptake in the liver and muscles by restoring the intracellular energy balance. 相似文献
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动物的生境是动物生活环境因子的综合,是野生动物赖以生存的环境。藏羚羊是一种濒危动物,是中国国家一级保护动物,近年来,人为活动的增加严重破坏了藏羚羊的生境,藏羚羊生境适宜性的评价对藏羚羊生境保护具有重要意义。本文综合考虑藏羚羊生境需求和可可西里自然保护区的生态环境,构建了藏羚羊生境适宜性评价指标体系（生态系统结构、海拔、坡度、水源、人类活动和道路）,基于2013年和2014年的国产GF-1遥感卫星影像,提取了生境要素（生态系统结构、水源、人类活动和道路）,最后结合DEM数据对保护区内的藏羚羊生境进行了适宜性评价,分析了其动态变化。结果表明：藏羚羊最适宜生境主要分布在海拔为4100~5200m的草地区域,距水源500~2000m,且远离人类活动和道路;2014年可可西里国家级自然保护区藏羚羊生境适宜区和较适宜区的面积占保护区总面积14.78%,主要分布在核心区和缓冲区,相比2013年,适宜区、较适宜区的面积分别增加了161.00km2、60.82km2,总体生境质量略有提高。 相似文献
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BackgroundJuglone is a naphthoquinone currently obtained by chemical synthesis with biological activities including antitumor activity. Additionally, juglone is present in the green husk of walnut, which suggests evaluating the effect of GH extracts on carcinogenic cell lines.ResultsWalnut green husk ethanolic extract was obtained as 169.1 mg juglone/100 g Green Husk and antioxidant activity (ORAC) of 44,920 μmol Trolox Equivalent/100 g DW Green Husk. At 1 μM juglone in HL-60 cell culture, green husk extract showed an antiproliferative effect, but pure juglone did not; under these conditions, normal fibroblast cells were not affected. A dose-dependent effect on mitochondrial membrane potential loss was observed. Apoptosis of HL-60 was detected at 10 μM juglone. Despite high ORAC values, neither purified juglone nor the extract showed protective effects on HL-60 cells under oxidative conditions.ConclusionsGreen husk extract generates an antiproliferative effect in HL-60 cells, which is related to an induction of the early stages of apoptosis and a loss of mitochondrial membrane potential. The normal cells were not affected when juglone is present at concentrations of 1 μM, while at higher concentrations, there is loss of viability of both cancerous and healthy cells.How to cite: Soto-Maldonado C, Vergara-Castro M, Jara-Quezada J, et al. Polyphenolic extracts of walnut (Juglans regia) green husk containing juglone inhibit the growth of HL-60 cells and induce apoptosis. Electron J Biotechnol 2019;39. https://doi.org/10.1016/j.ejbt.2019.02.001. 相似文献
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SONG Jianlan 《中国科学院院刊(英文版)》2008,22(4):219-220
Recent progress in dye-sensitized solar cells （DSCs） research and development, which use innovative light-harvesting dye （the ＂sensitizer＂）to improve the optical absorption coefficient of the stained nanostructured electrodes, might color our seemingly dimming future energy security with a tint of rose, despite the looming depletion of fossil fuels. Costing only 10-20% as its silicon counterparts, the new devices might make it affurdable for much more people to utilize solar energy, a handy renewable energy source. 相似文献
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纳米ZnO在染料敏化薄膜太阳电池中的应用 总被引：8，自引：0，他引：8
尝试使用溶胶 凝胶法制备的纳米ZnO作为光阳极制作染料敏化薄膜太阳电池 ,并讨论了电池的性能 ,与染料敏化纳米TiO2 薄膜太阳电池作了比较 ,探寻利用纳米ZnO薄膜半导体材料作为光阳极的可行性 相似文献
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形态分析法作为一种面向未来的系统分析方法,已被广泛运用于技术机会识别和技术预测等领域。但现有形态分析方法中,形态结构构建过程对领域专家有较强的依赖。虽有学者尝试引入定量分析方法,但单纯以词频为依据选择特征词,忽略了词间的影响,存在无法展示技术/部件的目的、构成和语义关系等缺陷,限制了技术预测的效果。因此,本文引入主语-谓语-宾语(SAO)语义挖掘方法,提出一种新型的技术形态识别方法,并以德温特专利数据为基础,描述了专利技术形态识别的过程,验证了该方法的可行性和有效性。该方法弥补了基于关键词方法的不足,增强了定量方法对技术形态识别中的应用,减少了技术形态定义对专家知识的依赖,提高了技术形态识别的效率,有助于为未来技术预测研究与应用提供重要的理论和方法保障。 相似文献
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Yulong Wang Changyu Duan Pin Lv Zhiliang Ku Jianfeng Lu Fuzhi Huang Yi-Bing Cheng 《国家科学评论(英文版)》2021,8(8)
Photovoltaic technology offers a sustainable solution to the problem of soaring global energy demands. Recently, metal halide perovskite solar cells (PSCs) have attracted worldwide interest because of their high power conversion efficiency of 25.5% and great potential in becoming a disruptive technology in the photovoltaic industry. The transition from research to commercialization requires advancements of scalable deposition methods for both perovskite and charge transporting thin films. Herein, we share our view regarding the current challenges to fabrication of PSCs by printing techniques. We focus particularly on ink technologies, and summarize the strategies for printing uniform, pinhole-free perovskite films with good crystallinity. Moreover, the stability of perovskite solar modules is discussed and analyzed. We believe this review will be advantageous in the area of printable electronic devices. 相似文献
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本文采用现有的中文自动标引与文档自动摘要的技术,将主题讨论区中的内容,通过网络技术自动汇总成常见问答集(Frequently Asked Questions)的知识形式,辅助版主能有效率地将主题讨论区中的知识分享给所有的成员使用。本文通过自动摘要文献的探讨,提出一个FAQ知识转换的概念模式。以混合式自动标引法作为中文关键词抽取的工具并结合相似度计算,将文章整理成FAQ摘要的形式。 相似文献
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Vishnu Kumar Farzana Mahdi Ashok Kumar Khanna Ranjana Singh Ramesh Chander Jitendra Kumar Saxena Abbas Ali Mahdi Raj Kumar Singh 《Indian journal of clinical biochemistry : IJCB》2013,28(1):46-50
The antidyslipidemic activity of Hibiscus rosa sinensis (Malvaceae) root extract has been studied in alloxan induced diabetic rats. In this model, oral administration of root extract (500 mg/kg bw. p.o.) for 15 days resulted in significant decreased in the levels of blood glucose, plasma lipids and reactivated post heparin lipoprotein lipase activity in alloxan induced diabetic rats. Furthermore, the root extract (50–500 μg) when tested for its antioxidant activity, inhibited the generation of super oxide anions and hydroxyl radicals, in both enzymic and non enzymic systems in vitro. The results of the present study demonstrated antidyslipidemic and antioxidant activities in root extract of H. rosa sinensis which could be used in prevention of diabetic-dyslipidemia and related complications. 相似文献