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关键词： 动物   检验   检疫   食品安全  

摘要： 食品安全影响着人类的生产生活,大到畜牧产业与社会经济的稳定,小到消费者的人身安全,均需要它发挥应有的作用。而动物检验检疫是确保食品安全的前提条件,它能全方面保护动物性食品安全,为了能能最大限度地发挥动物检验检疫在食品安全中的作用,本文简要剖析了动物检验检疫在食品安全中的重要作用,并针对各种问题提出了具体的解决措施,以期能够在宣传食品安全的重要性、加强动物检验检疫的监督与管理,提高执法队伍的综合素质等方面提供一定的参考。

关键词： Eelectronic nose   Multi-features representation   Wilks   statistic   Fisher discriminant analysis   Moldy maize  

摘要： In order to assess rapidly and timely the moldy degree of maize samples using electronic nose (E-nose) and improve the correct classification rate of E-nose, the different feature representation modes (DFRM) for E-nose data were explored in depth. A determining method for multi-features vector of E-nose based on Wilks I > statistic was introduced so as to obtain the best multi-features vector for characterizing E-nose data. And then a selection method of representation features of each sensor signals based on elimination transform with pivoting of the I > statistic was also introduced for the different excitation characteristic of each gas sensor. The research results show that the classification effect of multi-features representation mode (MFRM) is better than that of single feature representation mode (SFRM), and the MFRM is not a regular pattern, but the best multi-features vector of E-nose in MFRM can be obtained by the determining method. Moreover, it is necessary to select the representation features of each sensor signals in the MFRM using the selection method. The visual inspection results based on SFRM and MFRM were examined by Fisher discriminant analysis (FDA) and proved that the introduced methods were very effective, the highest correct discrimination rate based on SFRM is 80%, while the correct discrimination rate of the five features combination is 97%. As an outlook, we believe that the research findings may be universally applied for the classification of other food and agriculture products using E-nose.

关键词： Online courses   Cooperative/collaborative learning   Teaching/learning strategies   Improving classroom teaching   Online interaction  

摘要： The purpose of this study was to investigate the effects of learner-learner interactions on students' perceived learning, achievement, and satisfaction in an online undergraduate course. A quasi-experimental research design was conducted with 77 students registered into an online course. Two sections of the course were randomly assigned to control and treatment conditions. While students in the control group completed course assignments individually, students in the treatment group completed the assignments in small groups. The results of the study revealed that learner-learner interaction has a significant effect on students' achievement in an online course. Students working collaboratively achieved significantly higher than those working individually. Furthermore, students' perceptions of online collaboration increased after being involved in online group activities. (C) 2017 Published by Elsevier Ltd.

关键词： 金相检验   地位   作用   检验技术  

摘要： 金相检验技术能够对金属材料的结构、成分、组织等进行分析,从而帮助更好的控制材料。本文分析了金相检验的重要性以及作用,并列举了几个常用的检验技术,以期促进金相检验的更好发展。

关键词： 特种设备检验机构   特种设备   安全管理  

摘要： 特种设备在我国很多行业中,占据着非常重要的地位。本文对特种设备检验机构在特种设备安全管理方面的作用进行研究分析,以此展现特种设备检验机构存在的重大意义。

关键词： 紫外光源   红外光源   多波段光源   痕迹显现  

摘要： 随着证据体系的逐步健全,痕迹物证成为公安机关侦破案件的一个重要武器,而痕迹物证的发现和提取直接关乎整个案件的侦破。罪犯实施犯罪行为一定会留下犯罪痕迹,大量的犯罪信息就潜伏在这些痕迹里,要想找出这些潜在的信息,就必须要对犯罪现场遗留的痕迹物证进行快速有效的挖掘,在普通的光照条件下,这些痕迹物证往往难以发现,案件的侦破也陷入僵局。因此在实际的侦查活动中,通常使用特殊光源来搜索、观察痕迹物证,并对其进行拍照和提取。特殊光源在现场勘查中的应用,极大地方便了痕迹物证的发现和提取,也提高了犯罪现场勘查的效率,为案件的快速侦破奠定了基础。据此,主要以紫外光源和多波段光源在痕迹检验中的应用进行阐述。

关键词： 全自动尿沉渣分析仪   尿沉渣检验   效果  

摘要： 目的:探讨分析用全自动尿沉渣分析仪进行尿沉渣检验的作用与临床效果。方法:收集整理从2016年10月1日至2016年10月31日期间检验科收治的需要进行尿沉渣检验的尿液标本共600例为本次研究对象。给予600例尿液标本应用全自动尿沉渣分析仪进行尿沉渣检验,然后给予显微镜检验。将两种检验方法所得的相关数据资料进行收集汇总。研究结束后,将600例尿液标本的全自动尿沉渣分析仪检测结果与显微镜检验结果进行对比分析。结果:显微镜检验结果显示:红细胞(+)有168例,白细胞(+)有192例,管型(+)有40例;全自动尿沉渣分析仪检测结果显示:红细胞(+)有185例,白细胞(+)有215例,管型(+)有79例。全自动尿沉渣分析仪检测结果与显微镜检验结果进行对比分析,P<0.05。结论:应用全自动尿沉渣分析仪进行尿沉渣检验有较高的临床诊断准确率,但是亦有假阳性诊断情况存在。故此,针对尿沉渣检验,临床上应结合患者的实际情况给予应用全自动尿沉渣分析仪以及显微镜检验法可以保障临床诊断准确率,有效提高诊断的准确率,值得在临床上做推广及应用。

关键词： 全血C反应蛋白   血常规   细菌性感染性疾病  

摘要： 目的研究全血C反应蛋白与血常规联合检验在儿科细菌性感染性疾病中的诊断作用。方法选取我院2015年4月至2017年1月期间收治的166例细菌性感染性疾病患儿,随机分为对照组和研究组各83例。对照组仅进行血常规检查,研究组行全血C反应蛋白与血常规联合检验。比较两组患儿诊断的准确率和疾病检出率。结果研究组诊断的准确率和疾病总检出率均明显高于对照组,差异有统计学意义(P<0.05)。结论在儿科细菌性感染性疾病的诊断中,全血C反应蛋白与血常规联合检验具有重要意义,可充分体现出检查结果的准确性。

关键词： 血清C肽   糖化血红蛋白   糖尿病  

摘要： 目的:探讨血清C肽与糖化血红蛋白联合检验诊断糖尿病的作用。方法:收治糖尿病患者38例为观察组,选择体检人员38例为对照组,均进行血清C肽、糖化血红蛋白及血糖水平检测,比较检测结果。结果:在观察组,血清C肽明显低于对照组,糖化血红蛋白和血糖水平明显高于对照组(P<0.05)。结论:血清C肽与糖化血红蛋白联合检验诊断糖尿病的作用显著。

关键词： BIFIDOBACTERIUM   WILD boar   PHYLOGENY   MOLECULAR genetics   RNA-seq  

摘要： Occurrence of bifidobacteria, known as health-promoting probiotic microorganisms, in the digestive tract of wild pigs (Sus scrofa) has not been examined yet. One hundred forty-nine fructose-6-phosphate phosphoketolase positive bacterial strains were isolated from colonic content of twenty-two individuals of wild pigs originated from four localities in the Czechia. Based on PCR-DGGE technique targeting the variable V3 region of the 16S rRNA genes, strains were initially differentiated into four groups represented by: (i) probably a new Bifidobacterium species (89 strains), (ii) B. boum/B. thermophilum/B. thermacidophilum subsp. porcinum/B. thermacidophilum subsp. thermacidophilum (sub)species (49 strains), (iii) Pseudoscardovia suis (7 strains), and (iv) B. pseudolongum subsp. globosum/B. pseudolongum subsp. pseudolongum (4 strains), respectively. Given the fact that DGGE technique did not allow to differentiate the representatives of thermophilic bifidobacteria and B. pseudolongum subspecies, strains were further classified by the 16S rRNA and thrS gene sequences. Primers targeting the variable regions of the latter gene were designed to be applicable in identification and phylogeny of Bifidobacteriaceae family. The 16S rRNA-derived phylogenetic study classified members of the first group into five subgroups in a separated cluster of thermophilic bifidobacteria. Comparable results were obtained by the thrS-derived phylogenetic analysis. Remarkably, variability among thrS sequences was higher compared with 16S rRNA gene sequences. Overall, molecular genetic techniques application allowed to identify a new Bifidobacterium phylotype which is predominant in the digestive tract of examined wild pigs.