学科服务 更多>>

关键词： supernovae: general  

摘要： We re-examine the classifications of supernovae (SNe) presented in the Lick Observatory Supernova Search (LOSS) volume-limited sample with a focus on the stripped-envelope SNe. The LOSS volume-limited sample, presented by Leaman et al. and Li et al., was calibrated to provide meaningful measurements of SN rates in the local universe;the results presented therein continue to be used for comparisons to theoretical and modeling efforts. Many of the objects from the LOSS sample were originally classified based upon only a small subset of the data now available, however, and recent studies have both updated some subtype distinctions and improved our ability to perform robust classifications, especially for stripped-envelope SNe. We re-examine the spectroscopic classifications of all events in the LOSS volume-limited sample (180 SNe and SN impostors) and update them if necessary. We discuss the populations of rare objects in our sample including broad-lined SNe Ic, Ca-rich SNe, SN. 1987A-like events (we identify SN 2005io as SN 1987A-like here for the first time), and peculiar subtypes. The relative fractions of SNe Ia, SNe II, and stripped-envelope SNe in the local universe are not affected, but those of some subtypes are. Most significantly, after discussing the often unclear boundary between SNe. Ib and Ic when only noisy spectra are available, we find a higher SN Ib fraction and a lower SN Ic fraction than calculated by Li et al.: spectroscopically normal SNe. Ib occur in the local universe 1.7. +/- 0.9 times more often than do normal SNe. Ic.

关键词： 常规凝血检验项目   异位妊娠大出血   输血治疗   疗效监测   疗效预测  

摘要： 目的:探讨对异位妊娠大出血输血治疗患者在施以疗效监测以及疗效预测过程中,分析常规凝血检验项目的应用价值。方法:选择我院2015年7月—2017年4月收治的90例异位妊娠大出血患者作为实验对象;所有患者于临床施以输血治疗,依据有无表现出不良反应展开分组;分别设为A2组(未表现出不良反应80例)以及A1组(表现出不良反应10例)。之后对A1组与A2组患者凝血功能指标差异以及血常规检测结果差异回顾性分析。结果:同A1组异位妊娠大出血患者血常规指标改善程度对比,A2组异位妊娠大出血患者血常规指标改善效果尤为明显(P<0.05);同A1组异位妊娠大出血患者凝血功能指标比较,A2组异位妊娠大出血患者呈现出显著差异(P<0.05)。结论:临床对异位妊娠大出血患者在开展输血治疗工作期间,合理开展常规凝血检验项目工作,对于治疗不良反应以及临床疗效可以进行有效监测以及预测,凸显常规凝血检验项目的应用价值。

关键词： 胶体金法   荧光定量PCR检测法   生殖道沙眼衣原体感染   检测  

摘要： 目的探讨不同检验方法对女性生殖道沙眼衣原体感染的检测价值。方法选择该院2016年2月‐2016年11月收治的132例疑似女性生殖道沙眼衣原体感染患者为研究对象,分别对患者采取胶体金法与荧光定量聚合式酶联反应(PCR)检测法(FQ-PCR)进行检测,对两种检测方法的灵敏度、特异度、准确性、阴性预测值及阴性预测值进行观察。结果 FQ-PCR检测灵敏度、特异度、准确性、阳性预测值及阴性预测值分别为98.41%、97.10%、97.73%、96.88%及98.53%,胶体金法分别为49.21%、95.65%、73.48%、49.21%及95.65%,除特异度及阴性预测值差异无统计学意义外,FQPCR的灵敏度、准确性及阳性预测值均高于胶体金法(P<0.05)。结论 FQ-PCR检测法检测女性生殖道沙眼衣原体感染的灵敏度及准确性较高,可为临床早期诊断及治疗提供参考依据。

关键词： 经济效益   检验工作   甘南藏族自治州   园林植物景观   植物景观设计   木材   西北地区   景观建设  

摘要： 甘南藏族自治州卓尼县地处于我国的西北地区。随着社会主义精神建设的不断发展，我国西北园林植物景观建设的要求不断地增多。但是由于我国进入园林植物景观设计这一行业的时间太多，缺少这一方面的专业人员，所以我国园林植物景观的是设计大多都缺少整体结构的稳定性和观赏性，只是赋予他们艺术的外囊。为了改善甘南藏族自治州卓尼县城市的生态环境，我们需要深入的加强这些城市的园林建设。

关键词： 食品检验   实验室管理   质量体系  

摘要： 随着经济的高速发展,人们对食品的要求也越来越高,特别是对食品质量的要求。食品安全问题对人们的生活和身体具有很大的影响,可以通过专业的食品检查单位进行食品的检验。本文主要分析了食品检测过程中的各种问题与要求,以及食品检验实验室管理中质量体系的作用,从而保障食品的安全。

关键词： TREATMENT of alcoholism   DRINKING of alcoholic beverages & psychology   PHENOTYPE  

关键词： fMRI   Functional connectivity   Classification   MVPA   Depression  

摘要： In small, selected samples, an approach combining resting-state functional connectivity MRI and multivariate pattern analysis has been able to successfully classify patients diagnosed with unipolar depression. Purposes of this investigation were to assess the generalizability of this approach to a large clinically more realistic sample and secondarily to assess the replicability of previously reported methodological feasibility in a more homogeneous subgroup with pronounced depressive symptoms. Two independent subsets were drawn from the depression and control cohorts of the BiDirect study, each with 180 patients with and 180 controls without depression. Functional connectivity either among regions covering the gray matter or selected regions with known alterations in depression was assessed by resting-state fMRI. Support vector machines with and without automated feature selection were used to train classifiers differentiating between individual patients and controls in the entire first subset as well as in the subgroup. Model parameters were explored systematically. The second independent subset was used for validation of successful models. Classification accuracies in the large, heterogeneous sample ranged from 45.0 to 56.1% (chance level 50.0%). In the subgroup with higher depression severity, three out of 90 models performed significantly above chance (60.8-61.7% at independent validation). In conclusion, common classification methods previously successful in small homogenous depression samples do not immediately translate to a more realistic population. Future research to develop diagnostic classification approaches in depression should focus on more specific clinical questions and consider heterogeneity, including symptom severity as an important factor.

关键词： Type A   B Classification   Factor Analysis   Factor Mixture Model   Typology  

摘要： BackgroundThe type A/B classification model for alcohol use disorders (AUDs) has received considerable empirical support. However, few studies examine the underlying latent structure of this subtyping model, which has been challenged as a dichotomization of a single drinking severity dimension. Type B, relative to type A, alcoholics represent those with early age of onset, greater familial risk, and worse outcomes from alcohol use. MethodsWe examined the latent structure of the type A/B model using categorical, dimensional, and factor mixture models in a mixed-gender community treatment-seeking sample of adults with an AUD. ResultsFactor analytic models identified 2 factors (drinking severity/externalizing psychopathology and internalizing psychopathology) underlying the type A/B indicators. A factor mixture model with 2 dimensions and 3 classes emerged as the best overall fitting model. The classes reflected a type A class and 2 type B classes (B1 and B2) that differed on the respective level of drinking severity/externalizing pathology and internalizing pathology. Type B1 had a greater prevalence of women and more internalizing pathology and B2 had a greater prevalence of men and more drinking severity/externalizing pathology. The 2-factor, 3-class model also exhibited predictive validity by explaining significant variance in 12-month drinking and drug use outcomes. ConclusionsThe model identified in this study may provide a basis for examining different sources of heterogeneity in the course and outcome of AUDs.

关键词： Rotavirus A   Genomics   Phylogenetics   Genome sequencing   Reassortment   Co-infection   Antibody capture  

摘要： Background: Genomic characterization of rotavirus (RoV) has not been adopted at large-scale due to the complexity of obtaining sequences for all 11 segments, particularly when feces are used as starting material. Methods: To overcome these limitations, we developed a novel RoV capture and genome sequencing method combining commercial enzyme immunoassay plates and a set of routinely used reagents. Results: Our approach had a 100% success rate, producing >90% genome coverage for diverse RoV present in fecal samples (Ct < 30). Conclusions: This method provides a novel, reproducible and comparatively simple approach for genomic RoV characterization and could be scaled-up for use in global RoV surveillance systems. Trial registration (prospectively registered): Current Controlled Trials ISRCTN88101063. Date of registration: 14/06/2012

关键词： 食品检验实验室   质量体系   强化  

摘要： 我国经济不断发展,人们的生活水平有了显著地提高,对于生活安全和质量的要求也越来越高。在人们的生活中,食品有着重要的存在意义。但是近年来,食品安全事件曝光的越来越多,老百姓反应强烈。为了对食品安全加强控制,积极地进行食品检验意义重大,而要发挥食品检验的积极作用,首要就是加强食品检验实验室的管理。基于此,本文就食品检验实验室管理如何强化质量体系的作用进行分析,旨在促进提高我国的食品质量,进而提升人们的生活品质。