我国北缘桔区柑桔主要病虫害综合治理技术体系的研究

在对柑桔主要病虫害综合防治技术系统研究的基础上,以我国北缘桔区特定的生态条件为背景,结合现有的生产水平,组建了我国北缘桔区柑桔主要病虫害综合治理技术体系.该体系由关键性技术、信息、决策、推广和评价反馈5大系统组成;并概述了该体系建立的原理和指导思想.在汉中市、南郑县、勉县的5年试验示范表明,该技术体系的运转实施,经济、社会和生态效益显著提高.     

二棱大麦12个性状的相关分析

对大麦12个农艺性状的相关分析表明,穗粒重受多种因素影响,早代应注意对穗长的选择。株高、生育期对产量影响较小,可单独进行选择。大麦优良组合,应选第一主成分值大、第四主成分值小的组合,并放宽第二、三主成分值的取值标准。     

Antioxidant effects of chromium supplementation with type 2 diabetes mellitus and euglycemic subjects

To determine the effects of chromium (Cr) supplementations on oxidative stress of type 2 diabetes and euglycemic (EU) subjects, adult having HbA(1C) values of <6.0% (EU), 6.8-8.5% (mildly hyperglycemic, MH), and >8.5% (severely hyperglycemic, SH) were supplemented for 6 months with 1000 microg/day of Cr (as Cr yeast) or with a placebo. In the beginning, the levels of the plasma Cr in the MH and SH groups were 25-30% lower than those of the EU subjects. The values of thiobarbituric acid reactive substances (TBARS) and total antioxidative status (TAS) of the MH and SH groups were significantly higher than those of the EU ones. Following supplementations, the levels of plasma TBARS in the Cr groups of MH and SH groups were significantly decreased (the inverse was found in the EU) and showed no significant changes in the placebo group. The levels of plasma TAS in the Cr groups of EU and MH were significantly decreased (the inverse was found in the SH) and showed no significant changes in the placebo group. No significant difference was found in the antioxidant enzyme (superoxide dismutase, glutathione peroxidase, catalase) activities during supplementations. These data suggest that Cr supplementation was an effective treatment strategy to minimize increased oxidative stress in type 2 diabetes mellitus patients whose HbA(1C) level was >8.5%, and the Cr in EU groups might act as a prooxidant.     

区位模型在小城镇发展过程中的应用研究--以北京市大兴区为例

从大兴区14个乡镇的区位效应入手,分析小城镇体系(重点为卫星城)发展中存在的问题,提出相应的建议。依据区位理论,运用系统模型方法,将区位因素定量化,建立了区位优势度模型(包括经济吸引度模型和空间聚集度模型)和区位适宜度模型,对大兴区小城镇体系的区位状况进行分析并划分区位优势度等级,分析其区位适宜状况,判断其适宜度类型。研究结果证明该区位分析模型合理;黄村镇具有二级区位优势度,归于良好区位适宜类型,属于全面发展的综合型卫星城;亦庄镇具备一级区位优势度,归于基本适宜类型,属于特色卫星城。从而得出结论：区位模型可以对小城镇体系的区位优势和适宜程度进行定量评价。对卫星城和小城镇的持续发展提供发展定位和政策依据。     

Evaluation of IgG subclass responses against Dermatophagoides farinae allergens in healthy and atopic dogs

A semiquantitative chemiluminescent Western blot analysis system was developed and validated to evaluate antigen-specific IgG subclass responses to electrophoretically separated proteins of Dermatophagoides farinae in healthy and atopic dogs. Both groups mounted similar D. farinae-specific IgG1 and IgG4 responses to multiple antigens, but IgG2 and IgG3 responses were difficult to detect. The most commonly recognized bands in both groups were 18 and 98 kDa antigens for IgG1 and 18, 45, 66, 98, 130 and 180 kDa for IgG4. The number of bands recognized per dog did not differ significantly, but significantly more atopic dogs had an IgG1 response to a 180 kDa protein. The overall D. farinae-specific IgG1 and IgG4 responses were slightly higher, but not significantly different, in the healthy group. The results suggest that some antigens produced by D. farinae can induce different subclass responses. However, as most of these responses are seen in both healthy and atopic dogs, they are likely to merely represent recognition of foreign proteins presented to the immune system, rather than involvement in the pathogenesis of atopic dermatitis. The role of the 180 kDa antigen warrants further study.     

干旱胁迫对翠菊苗期生理生化特性的影响

以“吉农大蓝翠菊”(Callistephus chinensis (L.) Nees‘ Jinongda Blue’)为试材,研究干旱胁迫对其苗期生理生化特性的影响.结果表明,随胁迫程度的加深,翠菊的相对含水量变化呈下降趋势;脯氨酸质量分数、丙二醛质量摩尔浓度和细胞膜透性的变化呈上升趋势;SOD和POD活性的变化随时间的延长和程度的加深呈先上升后下降趋势.综合得出,处理T2(土壤相对含水量占田间土壤最大持水量的50％ ～ 60％)是翠菊维持正常生长能承受的最高程度干旱胁迫.     

人工辅助措施对大熊猫幼仔生长发育的影响

对陕西省珍稀野生动物抢救饲养研究中心人工繁殖的4只大熊猫幼仔进行育幼研究。研究方法:分母兽育幼组(1#、2#幼仔)和人工辅助育幼组(3#、4#幼仔)两组,其中母兽育幼组在断母乳之前由母兽独立育幼,人工辅助育幼组是在母兽育幼的基础上对幼仔进行80～100日龄人工乳补给、日光浴、沐浴、户外体能锻炼等人工辅助措施,并对两组幼仔体质量进行数理统计分析。结果显示:1)大熊猫幼仔出生至断母乳阶段体质量变化规律符合连续的多种函数段状曲线;2)人工辅助育幼组在实施有关措施后(100-160日龄),幼仔体质量增长与母兽育幼组有高度显著差异,F=5.9≥F=5.9≥(0.01(3,240))=3.86。可得出结论:人工辅助措施对促进幼仔个体发育、增加抗病力具有明显效果。     

北方无公害蔬菜生产技术探讨

作为生活的必需品,蔬菜的质量必须提高,无公害蔬菜应运而生,对无公害蔬菜消费的情况及生产技术和如何防止病虫害进行分析,提高蔬菜生产的技术,增强其质量。     

农用地分等定级在土地开发整理中的作用

农用地分等成果现已广泛应用于土地整理中,分析农用地分等成果在项目实施前、项目实施过程中以及项目实施后在土地开发整理项目中所起的作用,充分说明农用地分等成果在土地开发整理中的作用。     

马铃薯病虫害的防治技术探析

中国是马铃薯的生产大国,每年输出的马铃薯数量高居世界前列,为有效防治病虫害,分析马铃薯病虫害的种类,提出有效防治措施。