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A network of biological databases is reviewed, supplying a framework for studies of human genes and the association of their genomic variations with human phenotypes. The network is composed of GeneCards, the human gene compendium, which provides comprehensive information on all known and predicted human genes, along with its suite members GeneDecks and GeneLoc. Two databases are shown that address genes and variations focusing on olfactory reception (HORDE) and transduction (GOSdb). In the realm of disease scrutiny, we portray MalaCards, a novel comprehensive database of human diseases and their annotations. Also shown is GeneKid, a tool aimed at generating novel kidney disease biomarkers using systems biology, as well as Xome, a database for whole-exome next-generation DNA sequences for human diseases in the Israeli population. Finally, we show LifeMap Discovery, a database of embryonic development, stem cell research and regenerative medicine, which links to both GeneCards and MalaCards.  相似文献   

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建立了基于ICP-MS技术测定三氟化硼-苯甲醚配合物样品中11B同位素丰度的分析检测方法。采用酸碱交替洗涤方法减少记忆效应对11B同位素丰度测定的影响,采用标准品-样品溶液交叉测量方法降低质量歧视效应的影响。实验结果表明,当样品溶液的硼浓度在2.62~17.49 mg/L时,采用3.50 mg/L的标准品进行交叉测量,测量后采用8次酸碱交替洗涤,可大大减小同位素记忆效应和质量歧视效应。分析多次测量标准品溶液的结果表明,该方法的精密度低于0.1%,绝对偏差低于0.8%,平均回收率为101.0%。按照所建立的方法测定3份不同硼浓度的三氟化硼-苯甲醚配合物样品溶液,11B同位素丰度的相对标准偏差(RSD)均低于0.05%。与目前现有的其他ICP-MS检测方法相比,该方法具有前处理简单快捷、测量精密度高的优势,可为富集11B同位素的实验研究提供基础。  相似文献   

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Plants, being sessile, face an array of biotic and abiotic stresses in their lifespan that endanger their survival. Hence, optimized uptake of mineral nutrients creates potential new routes for enhancing plant health and stress resilience. Recently, minerals (both essential and non-essential) have been identified as key players in plant stress biology, owing to their multifaceted functions. However, a realistic understanding of the relationship between different ions and stresses is lacking. In this context, ionomics will provide new platforms for not only understanding the function of the plant ionome during stresses but also identifying the genes and regulatory pathways related to mineral accumulation, transportation, and involvement in different molecular mechanisms under normal or stress conditions. This article provides a general overview of ionomics and the integration of high-throughput ionomic approaches with other “omics” tools. Integrated omics analysis is highly suitable for identification of the genes for various traits that confer biotic and abiotic stress tolerance. Moreover, ionomics advances being used to identify loci using qualitative trait loci and genome-wide association analysis of element uptake and transport within plant tissues, as well as genetic variation within species, are discussed. Furthermore, recent developments in ionomics for the discovery of stress-tolerant genes in plants have also been addressed; these can be used to produce more robust crops with a high nutritional value for sustainable agriculture.  相似文献   

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建立利用微波消解-ICP-MS检测香精中重金属的方法,并根据JJF1059-1999《测量不确定度评价与表示》对该方法进行不确定度分析。以重金属锑为例建立数学模型,包括对称重、标准溶液配制、实验人员、环境等因素引入的不确定度进行分析。其中在方法的不确定度评定过程中,应主要考虑不确定度贡献较大的分量,从而简化实验操作步骤,提高工作效率。在置信区间为95%时,k=2,得出不确定度结果为UC=56.10μg/kg,测量结果报告表示为:c=(492.13±56.10)μg/kg。  相似文献   

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ICP-MS法测定土壤中金属元素   总被引:1,自引:0,他引:1  
姚亮  薛瑞 《当代化工》2014,(2):313-316
在微波条件下,采用HCl-HF-HNO3-H2O2体系消解土壤样品,使用ICP-MS法对其中几种金属元素的含量进行测定。设计了适当的实验方法,选择了合适的实验条件,并与ICP-AES法的测定结果进行了对比,最后与标准物质的参考值比较。实验结果表明,样品中的Cr、Co、Ni、Mn、Cu、Pb、Zn、Mo、Cd的测定值与标准值一致,使用这两种分析方法测定经微波消解的样品,结果均令人满意,但不同方法测定不同元素各有优势。可为多金属岩石矿物的分析测试提供方法经验和数据参考。  相似文献   

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Clinical genetic testing for Mendelian disorders is standard of care in many cases; however, it is less clear to what extent and in which situations clinical genetic testing may improve preventive efforts, diagnosis and/or prognosis of complex disease. One challenge is that much of the reported research relies on tag single nucleotide polymorphisms (SNPs) to act as proxies for assumed underlying functional variants that are not yet known. Here we use coronary artery disease and melanoma as case studies to evaluate how well reported genetic risk variants tag surrounding variants across population samples in the 1000 Genomes Project Phase 3 data. We performed a simulation study where we randomly assigned a “functional” variant and evaluated how often this simulated functional variant was correctly tagged in diverse population samples. Our results indicate a relatively large error rate when generalizing increased genetic risk of complex disease across diverse population samples, even when generalizing within geographic regions. Our results further highlight the importance of including diverse populations in genome-wide association studies. Future work focused on identifying functional variants will eliminate the need for tag SNPs; however, until functional variants are known, caution should be used in the interpretation of genetic risk for complex disease using tag SNPs.  相似文献   

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把水稻植株的稻米、谷壳、根、茎叶四个部位进行预处理,湿法消解后,ICP-MS测定Cr、Cd、Pb、Co、Mo、V等6种元素含量。实验结果表明:Cr主要集中在谷壳中;Cd、Pb、Co、V主要集中在水稻植株根部;Mo在糙米中的含量最高。该测定方法对各元素的检出限为0.001~0.025 mg/kg,加标回收率为93.3%~102.5%。对国家标准物质大米(GBW 10010)的分析结果与所给的标准值吻合,方法准确可靠,结果满意。  相似文献   

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韩梅  贾娜 《广东化工》2009,36(11):136-136,154
以Bi为内标,用等离子体质谱法同时灏定水中铀、钍元素的含量,优化了仪器工作条件。铀、钍的方法检出限分别为0.3、1.2ng/L,线性相关系数均〉0.999,对O.5000μg/L的铀、钍标准溶液测定的相对标准偏差分别为3.33%、3.03%,基体加标回收率为95%-106%,方法准确可靠。  相似文献   

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Tomato (Solanum lycopersicum) as an important vegetable grown around the world is threatened by many diseases, which seriously affects its yield. Therefore, studying the interaction between tomato and pathogenic bacteria is biologically and economically important. The TPR (Tetratricopeptide repeat) gene family is a class of genes containing TPR conserved motifs, which are widely involved in cell cycle regulation, gene expression, protein degradation and other biological processes. The functions of TPR gene in Arabidopsis and wheat plants have been well studied, but the research on TPR genes in tomato is not well studied. In this study, 26 TPR gene families were identified using bioinformatics based on tomato genome data, and they were analyzed for subcellular localization, phylogenetic evolution, conserved motifs, tissue expression, and GO (Gene Ontology) analysis. The qRT-PCR was used to detect the expression levels of each member of the tomato TPR gene family (SlTPRs) under biological stress (Botrytis cinerea) and abiotic stress such as drought and abscisic acid (ABA). The results showed that members of the tomato TPR family responded to various abiotic stresses and Botrytis cinerea stress, and the SlTPR2 and SlTPR4 genes changed significantly under different stresses. Using VIGS (Virus-induced gene silencing) technology to silence these two genes, the silenced plants showed reduced disease resistance. It was also shown that TPR4 can interact with atpA which encodes a chloroplast ATP synthase CF1 α subunit. The above results provide a theoretical basis for further exploring the molecular mechanism of TPR-mediated resistance in disease defense, and also provide a foundation for tomato disease resistance breeding.  相似文献   

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采用氢氟酸、硝酸、硫酸、高氯酸分解溶矿,用王水复溶后,移至聚乙烯试管中定容;提取1 m L澄清溶液,用(3+97)HNO3稀释至总稀释系数1 000倍后,在电感耦合等离子体质谱仪(ICP-MS)上测定Li、Be、Ga、Rb、Nb、Mo、Cd、Cs、Ta、W、Tl、Bi、Th、U元素,母液直接用电感耦合等离子体光谱仪(ICP-OES)测定Mg、Ca、Na、Co、Cu、Fe、La、Mn、Ni、Pb、Sr、Ti、Zn、V元素,此方法能充分溶解地质样品中的难溶元素和控制易挥发元素的损失,实验看出,岩石标准物质(GBW07106)、水系沉积物标准物质(GBW07309)和土壤标准物质(GBW07430)的测定值与标准值相吻合,检出限均符合规范要求。此方法准确度高,简单、快捷、实用能充分发挥大型仪器具有灵敏度高、检测限低、精密度好、线性范围宽及多元素同时测定等功能,具有样品前处理时间短、容易操作、成本低、准确度高、精密度好等优点,适合大批量地质样品多元素同时分析。  相似文献   

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《生活饮用水输配水设备及防护材料的安全性规范》对饮用水输配水设备浸泡水的卫生要求为铅的增加量小于0.001 mg/L。本文采用电感耦合等离子体质谱仪测定水龙头浸泡液中铅的含量。通过分析水龙头浸泡液中铅的测定过程,确定不确定度来源,建立数学模型,最终进行不确定度评定。当线性范围为:0~10μg/L时,其回归方程y=0.0839x-0.0005。结果表明:当浸泡液中铅元素浓度1.5~4.5μg/L,其测量不确定度为5%以下;其不确定度主要来自校正曲线和样品重复测定。  相似文献   

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微波消解ICP-MS法对食品中铝含量的测定分析   总被引:2,自引:0,他引:2  
李安  郝丽  李海燕  赵彤  王磊  刘志璋 《辽宁化工》2008,37(1):68-69,72
对市售的膨化食品、鲜、干水产品、豆制品采用微波仪消解,在电感耦合等离子体质谱仪上采用钪(Sc)作为内标元素对其中铝含量进行直接定量分析.方法前处理简便,测量快速、灵敏、准确.方法检出限为0.3 mg/kg ,相对标准偏差<3 % ,加标回收率在85 %~104 %.  相似文献   

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史芸  李杨  邱越  张鹏  王岳  魏鹏 《广州化工》2012,40(15):156-156,172
为了建立脂肪酸聚氧乙烯醚硫酸钠中(AES)Cu和Fe金属元素含量的测定方法,用微波消解法处理样品,电感耦合等离子体质谱法测定AES中的Cu和Fe,最终建立了电感耦合等离子体质谱法同时测定AES中Cu和Fe金属元素含量的方法。方法的检出限为0.0004898~0.0041500μg/L,相对标准偏差(RSD)小于1.0%,加标回收率为96.8%~99.8%。该研究结果为AES中Cu和Fe重金属元素的定量分析提供理论依据。  相似文献   

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建立了微波消解-电感耦合等离子体质谱法测定土壤中10种元素的分析方法。研究了同位素干扰对土壤测定的影响。方法检出限为0.01~0.46μg/L,精密度(RSD)≤4.8%,加标回收率为92.3%~108.3%。使用土壤标准物质进行验证,测定结果与标准值相符。建立的方法样品处理程序简单快速,线性范围宽,分析重现性好,结果准确,适用于大批量土壤样品的分析。  相似文献   

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超级微波消解-ICP-MS法测定塑料中锡元素   总被引:1,自引:0,他引:1  
通过试验,对超级微波消解条件和电感耦合等离子体质谱仪工作条件进行了优化,建立了超级微波消解-电感耦合等离子体质谱法快速测定塑料中的锡元素含量的方法。本方法的检出限为0.07 mg/kg,RSD为1.9%,多种材料的回收率为91%~107%。结果显示方法有良好的准确度,适用于多种塑料材料中Sn的快速分析。  相似文献   

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Water-deficit stresses such as drought and salinity are the most important factors limiting crop productivity. Hence, understanding the plant responses to these stresses is key for the improvement of their tolerance and yield. In this study M. truncatula plants were subjected to 250 mM NaCl as well as reduced irrigation (No-W) and 250 g/L polyethylene glycol (PEG)-6000 to induce salinity and drought stress, respectively, provoking a drop to −1.7 MPa in leaf water potential. The whole plant physiology and metabolism was explored by characterizing the stress responses at root, phloem sap and leaf organ level. PEG treatment led to some typical responses of plants to drought stress, but in addition to PEG uptake, an important impairment of nutrient uptake and a different regulation of carbon metabolism could be observed compared to No-W plants. No-W plants showed an important redistribution of antioxidants and assimilates to the root tissue, with a distinctive increase in root proline degradation and alkaline invertase activity. On the contrary, salinity provoked an increase in leaf starch and isocitrate dehydrogenase activity, suggesting key roles in the plant response to this stress. Overall, results suggest higher protection of salt-stressed shoots and non-irrigated roots through different mechanisms, including the regulation of proline and carbon metabolism, while discarding PEG as safe mimicker of drought. This raises the need to understand the effect at the whole plant level of the different strategies employed to apply water-deficit stress.  相似文献   

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多靶点药物治疗肿瘤、抑郁症、糖尿病等复杂性疾病效果显著,越来越受到重视。本文综述了多靶点药物的分类、发现策略和优势,总结和展望了多靶点药物在复杂性疾病中的应用现状及前景。  相似文献   

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