书目数据回溯建库若干问题的探讨

回溯建库工作是图书馆实现自动化、网络化的基础.结合工作实际和我馆的现状.探讨了图书馆从手工管理向现代化管理转变过程中,做好回溯建库工作的重要性,并就建库过程中易出现的问题及处理方案做了全方位的阐释.     

胆囊切除术与大肠腺瘤的关系分析

目的 探讨胆囊切除术与大肠腺瘤发生的关系.方法 回顾分析2008年至2010年在我院行全结肠镜检查11863例资料,以有胆囊切除术史的186例为研究组,按1∶3配比选择同时期相匹配的无胆囊切除术者558例为对照组,对两组大肠腺瘤的检出率、发生部位进行比较.结果 研究组中检出大肠腺瘤50例(26.9%),对照组中检出大肠...     

农产品流通码及追溯码的编码研究

对国内一些省市农产品质量安全追溯系统进行调研,结合海南省重点科技计划项目“海南省热带农产品质量安全追溯系统研究”的经验,参照农业部发布的《NY/T 1431-2007农产品追溯编码导则》标准,阐述农产品流通码及追溯码的编码知识。     

东北农业大学图书馆外文文献回溯建库方法与实践

分析了外文文献回溯建库的必要性,介绍了东北农业大学图书馆外文书目数据库建设现状,总结了在回溯建库过程中遇到的问题及解决方案。     

Stratification of sorghum hybrid testing sites in southern Africa based on grain yield

Sequential retrospective (SeqRet) pattern analysis technique was applied to classify sorghum hybrid testing sites in accordance with their similarity for yield differentiation among genotypes. Historical grain yield data from 150 multi-environment trials (METs) conducted at 23 sites in the Southern Africa Development Community (SADC) region during 1987/1988–1992/1993 was used. The sites were clustered into six major environment groups in the SADC region with a model fit of R² = 68%. Analysis of these 6 years’ data together with additional data from 1999/2000 stratified the 23 sites in the same six major groups (R² = 69%), the additional five sites in 1999/2000 classified with appropriate site groups. These results suggest that future sorghum hybrid testing could be cost-effectively conducted in a few representative sites selected from within each of the six identified site groups.     

项目管理在回溯建库中的应用

简要论述了项目及项目管理的定义及特点,分析了回溯建库实施项目管理的可行性,并对项目管理在回溯建库中的应用及积极意义进行了阐述。     

Penile and preputial tumours in the horse: a retrospective study of 114 affected horses

REASONS FOR PERFORMING STUDY: Preputial and penile tumours are more common in horses than in other domestic animals, but no large surveys of male horses with tumours of the external genitalia are available. OBJECTIVE: To present a retrospective analysis of male horses with neoplasms of the external genitalia. METHODS: The penile and preputial tumours of 114 horses were evaluated. Data recorded included age, gelding or stallion and breed; type and site of lesion; involvement of regional lymph nodes; histopathology (including grading of squamous cell carcinoma); and results of radiographic examination of the thorax. RESULTS: Mean age of horses was 19.5 years with no apparent breed predilection. Common presenting clinical signs were irregularities (e.g. the presence of a mass and/or ulceration) on the integument of the penis and prepuce, and purulent or sanguineous discharge from preputial orifice. Squamous cell carcinoma (SCC) was the most prevalent neoplasm followed by papillomas and melanomas. A basal cell carcinoma, neurofibrosarcoma, adenocarcinoma or fibrosarcoma were each found on single horses. Squamous cell carcinomas with poor differentiation had a higher tendency to metastasise than did more differentiated tumours. CONCLUSIONS: Squamous cell carcinoma is the most common urogenital tumour of the male horse and occurs primarily in old horses. Horses with poorly differentiated SCCs tend to have a higher incidence of regional metastases. Pathology of lymph nodes, even when not palpably enlarged, is a valuable diagnostic exercise. Radiology of the thorax to detect lung metastases is of little value.     

基于物联网的生猪质量安全追溯技术研究与应用

集成现代物联网技术,探索出一套符合东莞市生猪质量安全监控需求的物联网技术应用模式,并展望了农产品追溯的发展趋势。     

Density‐dependent effects of eastern Kamchatka pink salmon (Oncorhynchus gorbuscha) and Japanese chum salmon (O. keta) on age‐specific growth of western Alaska chum salmon

Hatcheries release >4.5 billion juvenile Pacific salmon (Oncorhynchus spp.) into the North Pacific Ocean annually, raising concerns about competition with wild salmon populations. We used retrospective scale analysis to investigate how the growth of chum salmon (O. keta) from western Alaska is affected by the abundance of chum salmon from Japanese hatcheries and wild pink salmon (O. gorbuscha) from the Russian Far East. Over nearly five decades, the growth of Kuskokwim River chum salmon was negatively correlated with the abundance of Japanese hatchery chum salmon after accounting for the effects of sex and spring/summer sea‐surface temperature in the Bering Sea. An effect of wild eastern Kamchatka pink salmon abundance on the growth of Kuskokwim River salmon was detectable but modest compared to the intraspecific competitive effect. A decrease in Japanese hatchery chum salmon releases in 2011–2013 was not associated with increased growth of Bering Sea chum salmon. However, the abundance of wild chum salmon from the Russian Far East increased during that time, possibly obscuring reduced competition with hatchery chum salmon. Our results support previous evidence that chum salmon are affected by intraspecific competition, and to a lesser extent interspecific competition, in the North Pacific, underscoring that the effects of salmon hatchery production transcend national boundaries.     

Environmental classification of maize-testing sites in the SADC region and its implication for collaborative maize breeding strategies in the subcontinent

When evaluating genotypes, it is efficient and resourceful to identify similar testing sites and group them according to similarity. Grouping sites ensures that breeders choose as many variable sites as possible to capture the effects of genotype-by-environment (GE) interactions. In order to exploit these interactions and increase testing efficiency and variety selection, it is necessary to group similar environments or mega-environments. The present mega-environments in the Southern African Development Community (SADC) countries are confounded within each country, which limits the exchange of germplasm among them. The objective of this study was to revise and group similar maize-testing sites across the SADC countries that are not confounded within each country. The study was based on 3 years (1999–2001) of regional maize yield trial data and geographical information systems (GIS) parameters from 94 sites. Sequential retrospective (Seqret) pattern analysis methodology was used to stratify testing sites and group them according to their similarity and dissimilarity based on mean grain yield. The methodology used historical data, taking into account imbalances of data caused by changes over locations and years, such as additions and omission of genotypes and locations. Cluster analysis grouped regional trial sites into seven mega-environments, mainly distinguished by GIS parameters related to rainfall, temperature, soil pH, and soil nitrogen with an overall R² = 0.70. This analysis provides a challenge and an opportunity to develop and deploy maize germplasm in the SADC region faster and more effectively.