东北地区天然林分区简述

从5个方面论述了东北地区的天然林分区与特点。     

In vitro effects of malathion and O,O,S-trimethyl phosphorothioate on cytotoxic T-lymphocyte responses

Oral administration of O,O,S-trimethyl phosphorothioate (OOS), an impurity present in technical formulations of malathion, has been shown to be associated with a high incidence of pneumonia in rats and to be highly immunosuppressive in mice. Based on these findings, an in vitro model was established to study the effect of this and other organophosphorus compounds on murine cytotoxic T-lymphocyte (CTL) responses. The organophosphorus compounds were tested for their ability to block in vitro generation of CTL responses to alloantigen and/or the expression of these cytotoxic responses. Responses were generated in C57Bl/6 (H-2^b) spleen cells to mitomycin C-blocked P815 (H-2^d) tumor cells. The cytotoxicity of the cultured splenocytes to P815 target was measured using a 4-hr chromium release assay. These data demonstrated that malathion was able to block the ability of splenocytes to sensitize to P815 at concentrations as low as 25 μg/ml, but was not able to block the expression of cytotoxicity by mature killer T cells. The same was true for OOS which had been activated by preincubation with rat liver postmitochondrial supernatant (PMS). Activated OOS blocked the generation of CTL responses at concentrations as low as 75 μg/ml while having no effect on mature cytotoxic cells. In fact, both malathion and activated OOS were no longer able to suppress CTL responses if treatment was performed as early as 24 hr after exposure to antigen. Additionally, it was demonstrated that when malathion was preincubated with PMS it was no longer suppressive and that OOS without activation failed to suppress CTL responses.     

数据仓库布纹和表格分割

数据仓库技术的产生是由于决策支持系统发展的需要,是体系结构设计的核心.数据仓库必需设计成可扩展的体系结构,从而满足不断增长的数据和用户的需求.本文通过对数据仓库平台布纹和表格分割进行研究和分析,使得当大量异构数据涌入数据仓库平台中时系统性能不会下降,很好地满足决策支持.     

东北三省薪炭林区划

为指导农村能源建设,并为其提供科学依据。本文对东北三省内的森林资源、薪材资源和农村能源状况,以及自然地理条件等进行研究,提出了薪炭林区划的原则和依据,将东北三省区划为3个类型区(一级区):薪炭林不发展区(Ⅰ)、薪炭林一般发展区(Ⅱ)和薪炭林重点发展区(Ⅲ)。根据类型区划和自然地理区划、行政区划相结合的原则,在一级区划的基础上,划分了11个二级区:大兴安岭山地区(Ⅰ_1)、小兴安岭山地区(Ⅰ_2)、长白山中部山地区(Ⅰ_3)、长白山北部山地区(Ⅱ_1)、吉林省中部丘陵区(Ⅱ_2)、辽东中低山地区(Ⅱ_3)、松嫩平原区(Ⅲ_1)、三江平原区(Ⅲ_2)、辽河中下游平原区(Ⅲ_3)、辽西低山丘陵区(Ⅲ_4)、辽东半岛低山丘陵区(Ⅲ_5)。并提出了各区薪炭林发展规划。     

The Optimum Sowing Time for Plastic-film Corn and the Application of Two Related Theories

［1］Wu R X, Cui Z M, Pei T X, et al. Exploration of the optimum sowing time for dry-farming plastic-film corn in semi-arid area.North China Agriculture, 1999,14( Special Issue for Dry-farming Agriculture) :96. (in Chinese) ［2］Yu S L. Crop Planting(northern edition). Vol. 1. Beijing: Agriculture Press, 1984:172- 176,228. (in Chinese) ［3］Hu K N. Handbook for Agriculture Technicians. Shanghai:Shanghai Science and Technology Press, 1994:2. (in Chinese) ［4］Wang Y L. Complete Collection of Plastic-film Planting Techniques. Beijing: Agriculture Press, 1991: 388,395,389,397 -398. (in Chinese) ［5］Bai D C. Science and technology provide wings for Hetao agriculture. Modern Agriculture, 1998, (1): 1. ( in Chinese) ［6］Wang W Z. Let‘s summarize our experience and lessons to improve plastic-film corn planting in dry land. Modern Agriculture, 1997, (5) :24. (in Chinese) ［7］Wang W Z, Ding S H, Shi X W, et al. Plastic-film Corm and Interplanting. Chifeng: Inner Mongolian Science and Technology Press, 1993:28. (in Chinese) ［8］Gao G J, Li Z X. Plastic-film Planting Techniques for Hybrid Corn. Beijing: Agriculture Press, 1988: 21 - 22. ( in Chinese) ［9］Ma Z Y, Zhang B Q. Plastic-film corn planting techniques.Hebei Agricultural Science and Technology, 1990, ( 1 ): 14. ( in Chinese) ［10］Tong B Y. Plastic-film corn planting techniques. Newsletter of the Agricultural Science and Technology, 1994, (8): 6. (in Chinese) ［11］Wang E Q, Guo J B. Technique rules of plastic-film com planting in dry land. Modern Agriculture, 1995:( Supplementary Issue)16. (in Chinese) ［12］Wang Z X, Gao X X, Ye J C, et al. Ask and Answer on Key Techniques of Corn Planting. Beijing: China Agriculture Press,1998:116. (in Chinese)     

接骨木属植物分种 研究

接骨木属植物种的划分比较困难,目前还没有定论。接骨木的种过渡型和种间的交叉比较多,研究这个问题的人又少。本文就吉林省分布的接骨木属的分种进行了研究,找出了稳定性状和特征作为分类依据,并将吉林省接骨木属划分为六个种。     

湖北省烤烟生产的气候分区

根据湖北各产烟县市1961—2000年的气象资料，应用系统聚类方法，将全省烤烟种植区划分为5类气候区，并对其气候特点及适宜移栽期进行了分析。通过与国内外优质烤烟区气候条件对比分析，探讨确定了省内优质烤烟的生产区域，其中以咸丰、利川和五峰的气候条件最为优越，为全省及县域内烤烟布局调整和相关技术措施的调整和改进提供依据。     

吉林省乡镇工业发展区划的研究

文章根据乡镇工业发展的特点，研究确定了乡镇工业的分区依据、原则和分区指标，采用模糊聚类和动态聚类分析的数学方法完成了吉林省乡镇工业发展区划，提出了各区域乡镇工业发展的方向、重点、步骤和措施     

黑龙江省农业资源环境分区预警研究

在评价区域农业资源环境基础上预测分析了资源环境变化趋势 ,建立了区域农业资源预警系统 ,给出区域农业资源环境的不良状况预警、负向演化预警和恶化速度预警 ,并提出相应的调控措施。     

阳新县竹类区划及其资源开发对策研究

由5属26个竹种组成的阳新县竹林，形成了3个分别以灰竹、毛竹、早园竹为主的代表中国毛竹水平区划3个等级的分布区。区域的界定和分区发展方向的确立，深化了湖北省和中亚热带的毛竹水平区划，为鄂东南地区森林植被类型的区域划分提供了重要的参考证据。