膨化工艺对乳仔猪日粮养分及生长性能的影响

采用相同配方的膨化颗粒料和普通颗粒料进行哺乳仔猪和断乳仔猪日粮常规营养成分、氨基酸含量、细菌数量、脲酶活性、物理性状分析和乳仔猪生长饲养试验。结果表明 :两种制粒工艺的常规营养成分间差异不显著 :氨基酸总量、必需氨基酸和非必需氨基酸含量膨化料的比普通颗粒料高6.67 %～7.59 % ,差异不显著(P>0.05) ;两种饲料的卫生学和感官指标符合GB13278 -91 ,但膨化料的总细菌和大肠杆菌最可能数少于普通料 ,差异不显著(P>0.05) ;乳仔猪两料中的脲酶活性 ,膨化颗粒料比普通料分别降低56.25 %和28.57 % ,但差异不显著(P>0.05) ;膨化料与普通料相比 ,硬度明显增加 ,其中 ,哺乳仔猪料间差异显著(P<0.05) ,断乳仔猪料间差异极显著(P<0.01) ;膨化料与普通料相比 ,淀粉糊化度哺乳仔猪和断乳仔猪料分别提高32.86 %(P<0.05)和45.45 %(P<0.01)。饲养试验 ,膨化料育成率为96.77 % ,70日龄窝重203.76kg ,窝均盈利1040.83元 ,分别比普通料提高3.85 %(P>0.05)、13.01 %(P>0.05)和36.48 %(P<0.05)。     

阿月浑子中酚类物质提取方法与气相色谱-质谱分析

用不同的提取方法对阿月浑子叶酚类物质的定性分析进行了研究,通过比较确定用氢氧化钠水溶液提取阿月浑子叶中的酚类物质效果最佳,经硅烷化后用气质联仪进行定性分析,并与标准样品的气相色谱-质谱图对照,可得到阿月浑子叶中含儿茶素,没食子酸,香豆酸,邻苯二酚和邻苯三酚.     

稠油降解菌的筛选及其对胶质和沥青质生物降解

以稠油为唯一碳源,从辽河油田石油污染土壤、渣油中,经富集培养,分离筛选出细菌菌株11株、真菌23株和放线菌10株。将在含油培养基上长势良好的菌株进行室内摇瓶实验,发现真菌的降解效果好于细菌,F2006的降解效果最好,14d去除率达到39.8%。在胶质和沥青质污染土壤中,观察真菌F4、F2008、F9902、F2006、F2017、F6和F9904在14d、28d和42d对胶质和沥青质的去除率,测试结果表明,菌株F2006和F2008降解效果较好,在42d时去除率分别达到55.73%和57.62%。两次实验说明,菌株F2006为降解胶质和沥青质的优势菌株,在生物修复中具有较好的应用前景。     

红叶石楠嫩枝扦插育苗技术研究

鲁宾斯是红叶石楠中抗性强、相对较耐寒的品种,本文利用全光照自动喷雾装置对鲁宾斯嫩枝扦插育苗技术进行了研究。结果表明：外源激素IBA＋NAA混配成适宜的浓度,辅以合适的水分管理措施,可有效提高红叶石楠嫩枝扦插的生根率。本研究为今后红叶石楠的嫩枝扦插繁殖提供了参考依据。     

蜂斗叶组培快繁体系的建立

对蜂斗叶的组培条件进行了较系统的研究.结果表明,以蜂斗叶的叶柄切段为外植体,在MS+6-BA 2mg/L培养基上可诱导出胚性愈伤组织并分化出丛生芽;芽丛在MS+6-BA1 mg/L的继代培养基上,月繁殖系数可达3倍以上;健壮芽在1/2 MS+NAA 0.1 mg/L+活性炭1 mg/L的生根培养基上生根率为100%.     

修水县一季晚稻免耕抛秧技术要点

简要介绍了江西省修水县一季晚稻的免耕抛秧技术要点。     

冬凤兰非共生萌发和低温离体保存（英文）

[Objective] The aim of the research was to establish asymbiotic germination and low-temperature in vitro conservation technique system of Cymbidium dayanum by using plant tissue culture technique to realize its rapid propagation and long-term conservation in vitro.[Method] With mature seeds of C.dayanum as explants,different media were selected to establish asymbiotic germination technique system.With protocorms as materials,conservation,resumptive proliferation and plant regeneration conditions were selected to establish low-temperature in vitro conservation technique system preliminarily.[Result] Mature seeds of C.dayanum could germinate after cultured 90 days on MS media as well as "Hyponex 1" media.The germination rate reached more than 98%.Protocorms inoculated in "Hyponex 1" media could be conserved continuously at 5 ℃ in dark for more than 18 months and the survival rate could reach 90%.Conserved protocorms could realize resumptive proliferation culture both on 1/2 MS and "Hyponex 1" media.The seedling-strengthening and rooting media were 1/2 MS media.[Conclusion] This research provided practical basis for in vitro conservation and rapid propagation of C.dayanum germplasm resource.     

中国云南古茶树群落的分布和多样性

在云南不同地区,目前仍分布着大片较完整的古茶树群落。本文分析了云南主要茶区古茶树群落的分布、种类和古茶树群落保存的多样性,旨在促进云南茶业健康、稳定地发展。     

Effects of Supplemental Histamine on Gastric Acid Secretion, Digestive Enzyme Activities, Intestinal Microfloral of Early Weaned Piglets

Two experiments were conducted to study the effect of supplemental histamine in the diet ofearly-weaned piglets. In experiment A, 24 cross bred piglets with an average body weight of 6.10±0.40 kg,weaned at the age of 28 days, were divided into four groups, fed with basal diet of low dietary copper without(control) or with supplemental histamine at 60, 120, 180 μg kg-1 BW. During the two weeks and the thirdweek after weaning, ADG(average daily gain) of piglets were increased by 15.8% (P＜0.05), 9.5% (P＜0.10) by addition of 60 μg kg-1BW histamine, but decreased by addition of 180 μg kg-1BW histamine, whichalso increased the amount of E. coli in colon and the scour incidence. The secretion of gastric acid and pepsinwere improved by both dose of supplemental histamine (60, 180 pg kg-1BW) and gastric digesta pH were de-creased by both. Addition of 60 μg kg-1 BW histamine improved the activities of trypsin, amylase in duodelumdigesta. In experiment B, 12 cross bred piglets with an average body weight of 6.85±0.35 kg, weaned at theage of 28 days, were divided into two groups, fed with basal diet of high dietary copper without (control) orwith supplemental 60 μg kg-1 BW histamine. During the two weeks and the third week after weaning, ADG ofpiglets were increased by 9.8% (P＜0.05), 7.0% (P＜0.10). The secretion of gastric acid, activities oftrypsin and amylase in duodelum digesta, were also improved by addition of 60 μg kg-1 BW histamine. The re-sults showed that addition of histamine (60 μg kg-1 BW) in early weaned piglets could increase the secretion ofgastric acid and pepsin, reduce gastric digesta pH and scour incidence, improve activities of trypsin, amylasein duodelum digesta, and the growing performance of early weaned piglets.     

惠州市名木古树白蚁危害加重的原因及防治对策

200 0年和 2 0 0 3年的 4～ 6月对惠州市城区名木古树白蚁发生的种类与危害程度的调查结果显示 ,主要危害种类为黑翅土白蚁〔Odontotermesformosanus (Shiraki)〕和台湾乳白蚁 (CoptotermesformosanusShiraki ) ;白蚁危害程度随时间的延长而加重 ,平均受害株率由 2 0 0 0年的 5 1.2 6%上升到 2 0 0 3年的 76.0 5 % ,白蚁危害率也随着树龄的增大而加重 ,树龄 2 0 0年以上的古树 10 0 %受到白蚁侵害。并分析了白蚁危害加重的原因 ,提出相应的防治对策