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采用基于个体基因组DNA序列的差异而进行个体识别的DNA溯源技术,建立DNA溯源系统对肉产品的质量安全进行控制。在实验群体中(10个品种,233个个体)检测了33个新单核苷酸多态性(single nucleotide polymorphism,SNP)标记的遗传多样性,通过杂合度计算筛选出6个SNP标记可用于猪肉产品DNA溯源。进一步在屠宰场采样进行溯源模拟实验,结果表明筛选的18个SNP标记(6个新SNP标记结合已有的12个SNP标记)能有效区分100头猪个体,随机抽取的10个个体的组织样品都能通过基因型比对找到对应的个体。本研究可为早日建立猪肉产品的DNA溯源系统提供一定的技术参考。 相似文献
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1 Introduction Mercury cadmium telluride (Hg1?xCdxTe, MCT) is currently one of the most widely used semiconductor materials for infrared detector arrays. It is well known that the applications of the semiconductor materials, especially for Ⅱ-Ⅵ compound… 相似文献
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Fluorinated amorphous hydrogenated a-C:F:H carbon thin films were deposited using radio frequency plasma enhanced chemical vapor deposition(RF-PECVD) reactor with CF4 and CH4 as source gases and were annealed in a N2 atmosphere. The properties of these films were evaluated by FTIR spectrometry, UV-VIS spectrophotometry and single-wavelength spectroscopic ellipsometry. A correspondence relativity connection between the deposition rate and technology was found. The chemical bonding structures and the content of CHx and CFx in the films are transformed and the optical band gap decreases monotonically with increasing temperature after annealing.The dielectric constant is increased with decreasing content of F in the films and the optical band gap is decreased with decreasing the content of H in the film. 相似文献
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详细介绍了用脉冲激光法制备金刚石产品的发展过程,并总结了脉冲激光沉积(PLD)、液体靶脉冲激沉积(LYPLD)以及脉冲激光诱导液-固界面反应(PLIIR)等几种典型的实验方法、实验装置以及所取得的成果。在脉冲激光沉积法(PLD)制备金刚石薄膜方面重点总结了最近比较新颖的液体靶脉冲激光沉积技术,而在金刚石纳米晶的制德方面综述了脉冲激光诱导液-固界面反应法,此法在制备亚稳态主晶体方面显示出了较独特的优 相似文献
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脉冲激光诱导液—固界面反应制备石墨相C3N4 总被引:1,自引:0,他引:1
透射电子显微镜(TEM)、高分辨电子显微镜(HREM)和X射线光电子谱分析表明,通过脉冲激光诱导液氨-石墨靶界面反应首次合成了石墨相C3N4。观察到了石墨相C3N4的TEM形貌;对石墨相C3N4晶面间距的实验和理论计算值进行了比较,两者非常吻合。 相似文献
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1 INTRODUCTIONRecentadvancesinultralargescaleintegrationdevices(ULSI)haveledtoaneedfornewintercon netionsmaterialswithlowresistivityandinterlayermaterialswithlowdielectricconstanttoreducetheinterconnetiondelay ,interfere ,noiseandwastagecausedbyparasiticcapacitance .ReplacingAlintradi tionalAl/SiO2 systemwithCu ,ithasreachedaunanimousagreement .MaterialsunderresearchtoreplaceSiO2 mainlycontainPTFE ,SiOF ,F PIanda C∶F∶H .PTFE(κ≈2 .0 )andSiOF(κ≈3.0~3.5 )havelowdielectric… 相似文献
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液体中激光熔蚀固体靶制备氮化碳纳米晶 总被引:6,自引:0,他引:6
本文提出一种独特的激光熔蚀法即在液体中激光熔蚀固体靶制备纳米晶,并且首次在氨水中激光熔蚀石墨靶制备出氮化碳纳米晶。透射电镜(TEM)和高分辨率电镜(HREM)分析表明制备的氮化碳纳米晶由α-C3N4、β-C3N4和Graphite-C3N4晶粒组成。 相似文献