Large granular lymphocyte leukemia in a ferret     

Boon LI  Barthel R  Helman RG  Drew M 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1995,24(1):6-10

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农村土地流转的深层原因探析     

樊帆 《热带作物学报》2009,29(7):53-56

探析农村土地流转的深层原因：1.土地流转是农业发展新阶段土地经营制度创新的客观需要；2.比较利益是促成农村土地流转的内在动力；3.土地流转是新时期现代农业发展的客观要求；4.现行法律、政策为土地流转提供了政策支持。  相似文献   

油松大苗移植技术研究   总被引：2，自引：0，他引：2  

魏帮庆  独军 《甘肃林业科技》2011,36(3):55-57

根据油松的生物与生态学特性,通过采用不同时间、不同栽植地点、不同树龄的移栽试验,试验结果表明,在春季新芽未萌发时移栽,可使树龄为10-15年的苗木成活率达到88.0%以上。该技术对油松大苗的移植培育具有一定的参考价值,对满足城市园林绿化建设也具有一定的促进作用。  相似文献   

陕西牛背梁国家级自然保护区大型真菌区系特征研究   总被引：1，自引：0，他引：1  

王晓亮  赵德怀  麻应太 《陕西林业科技》2012,(5):7-14,19

通过对陕西省牛背梁国家级自然保护区大型真菌的调查和研究,结果表明:本保护区共有真菌165种,隶属2门4纲10目35科79属,其中以担子菌门层菌纲真菌的种类数量最多,为144种,占保护区大型真菌总种数的87.3%;共有优势科9个含47属111种,分别占保护区大型真菌总科数的26.5%、总属数的59.5%,总种数的67.3%;本区大型真菌主要集中分布在海拔2 300m以下的区域,共有159种,占保护区大型真菌总种数的96.4%,大型真菌的种类、种群密度以及数量随着海拔升高而递减。从大型真菌在不同植被类型内分布看,大型真菌以分布于阔叶林带的种类较多,达126种,占调查总种数的76.4%,其次为灌丛林和针叶林。  相似文献   

Latent membrane protein 1 regulates expression of p27 and RPLP0 in nasopharyngeal epithelial and nasopharyngeal carcinoma tissues     

ZHAO Qiang  ZHANG Zhi-wei  LIU Zhong-yuan  YANG Ke  XIE Ni  ZHANG Jie 《园艺学报》2012,28(10):1830-1834

AIM: To observe the protein expression of p27 and ribosomal phosphoprotein large P0(RPLP0) regulated by latent membrane protein 1 (LMP1) in nasopharyngeal epithelial and nasopharyngeal carcinoma tissues. METHODS: The protein levels of p27 and RPLP0 and the relationship with LMP1 were analyzed by Western blotting. The protein expression of LMP1, p27 and RPLP0 was also detected by the method of immunohistochemistry in 30 nasopharyngeal epithelial and 60 nasopharyngeal poorly-differentiated squamous-cell carcinoma tissues. Meanwhile, the significance of clinical pathology was evaluated. RESULTS: The positive rate of LMP1 protein was 73.3% and 90.0% in nasopharyngeal epithelial and nasopharyngeal poorly-differentiated squamous-cell carcinoma tissues, respectively. Compared with the LMP1-negative tissues, the protein levels of RPLP0 were low in the nasopharyngeal epithelial and nasopharyngeal poorly-differentiated squamous-cell carcinoma tissues with LMP1-positive expression, but the levels of RPLP0 protein were overexpressed. The protein expression of RPLP0 and RPLP0 was related to the age of nasopharyngeal carcinoma patients, the protein level of LMP1, the metastasis of lymph nodes and the TNM classification. The positive expression of p27 protein at high level was usually observed in the patients with young age, or had the characteristics of LMP1 (-), non-metastasis of lymph nodes, and in I or II stage of TNM classification. However, the protein expression of RPLP0 was low (P<0.05). CONCLUSION: LMP1 down-regulates p27 and up-regulates RPLP0 in nasopharyngeal epithelial and nasopharyngeal poorly-differentiated squamous-cell carcinoma tissues.  相似文献   

规模经济与企业的长期规划     

庄严 《内蒙古林业调查设计》2000,23(2):44-46

企业获取最大经济效益的规模 ,只能是最经济的规模 ,而非无限大的规模。文章就企业发展规模经济提出了建议  相似文献   

浅谈500万千克房式仓的建设与应用     

司永芝  梁玉林  王瑞全  王保祥 《粮食储藏》2000,29(3):20-22

本文重点对大型房式仓的施工、长期储粮应用、机械通风效果、仓体结构等进行了综合验证，结果证明：该该类仓房可用作长期储粮仓库。  相似文献   

分析大跨度建筑结构使用的步履式架梁起重机的机械性能     

王显明  夏文举  刘建中 《森林工程》2000,16(3):43-44

本结合大跨度建筑结构施工要求，对架梁用步履式架桥起重机设计方案要点，各机构特点做了分析。  相似文献   

New frontiers of land and water commodification: socio‐environmental controversies of large‐scale land acquisitions     

《Land Degradation \u0026amp; Development》2017,28(7):2234-2244

A growing number of regions in the developing world are targeted by transnational investors who are acquiring large amounts of land and natural resources. Driven by the increasing global demand for agricultural products, such investments are often considered an opportunity for economic development in the target country. However, there are concerns about the social and environmental impacts on local communities. In this brief review, we discuss some key socio‐environmental controversies surrounding large‐scale land acquisitions (LSLAs). LSLAs often target common property systems and lead to privatization and commodification of land through long‐term land concessions. There is a debate between supporters of foreign land investments as a means to attract modern agricultural technology that would decrease the yield gap in underperforming agricultural land and those who question such a development model because it is seldom coupled with policy instruments that would ensure that the benefits improve food security in local populations. Large‐scale land investments displace a variety of systems of production ranging from small‐scale farming to (arguably) “unused” land such as forests and savannas on which local communities often depend. Moreover, LSLAs entail an appropriation of water resources that may negatively impact local farmers or downstream human and natural systems. In most cases, investors keep the land fallow but, when they put it under productive use, they typically change land cover and land use to start intensified commercial farming, often for nonfood crops. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

稻瘟病菌大片段DNA转化载体的构建     

陈亚平  施文骁  王洪凯 《中国水稻科学》2015,29(1):91-96

构建能够转化大片段DNA的载体是进行基因簇功能分析的重要手段。利用cosmid载体和pBHt2载体构建了一个可以在稻瘟病菌中转化大片段DNA的载体,通过农杆菌介导的转化方法,成功地将超过30kb的大片段DNA转化到稻瘟病菌中。研究结果将促进稻瘟病菌基因簇的功能分析。  相似文献