特早熟抗病棉花品种辽棉35选育及栽培技术

本文主要介绍辽棉35的选育过程、生物学特性、产量、纤维品质、抗病性及栽培技术要点。     

β-葡聚糖对啤酒易滤性影响的研究

通过对啤酒中β-葡聚糖的定性定量分析和啤酒易滤性的测定,发现溶解状态的β-葡聚糖对啤酒的过滤没有明显的影响,而β-葡聚糖凝胶对啤酒过滤有严重影响.啤酒中β-葡聚糖凝胶的分子量在300 000以上,当含量达到20 mg/1时,就会使啤酒膜过滤困难.啤酒的易滤性与β-葡聚糖含量之间里r=-0.222的不显著负相关,而与β-葡聚糖凝胶的含量之间呈r=-0.841~(***)的极显著负相关.     

几种代表性牧草对水牛泌乳高峰期生产性能的影响

将36头泌乳期、产奶量相近的水牛均分3组,探讨禾本科黑麦草、豆科紫花苜蓿、蓼科鲁梅克斯K-1三种牧草对泌乳高峰期生产性能的影响,结果发现,饲喂鲁梅克斯K-1分别比紫花苜蓿和黑麦草提高15.93%、13.14%的产奶量(P<0.05),以及6.09%、6.63%的乳脂率(P<0.01);而紫花苜蓿与黑麦草间差异均不显著(P>0.05)。故种植鲁梅克斯K-1适合我国农村散养水牛的小区放牧或舍饲补饲。     

A Comparison of Techniques for Preparing Somatic Chromosomes in Ribes Species

Ribes plants,like most of other fruit trees ,are characterized by their large number but small size of somatic chromosomes.In the light of these spccial characteristies,we have examined several factorial combinations of material,pretreatment,slide preparing method and stain to identify the most promising techique for studying the chromosomes and further analyzing the karyotypes and chromosome banding of Ribes plants.The resuts indicated that the combination of root tip with pretreatment of 2m molL^-1 8-hydroxyquinoline plus 0.05% colchicine or 0.3% balm for 3-5 hours at 14℃,pre-hypotonic treatment of 0.07mol L^-1 KCl for 30min,fixation in Carnoy‘s fluid,hydrolysis in 5% cellulase and 5% pectinase mixture for 4-5 hours at 25℃,post-hypotoic treatment in distilled water for half an hour and staining in Giemsa Could make the chromosome preparation superior to other treatment combinations.     

25s rRNA 基因部分序列比较在香菇栽培菌种鉴定上的应用

对目前中国7个主要香菇栽培品种：科，26，939，135，9311，申10和7402和25s rRNA基因中的D1／D2片段进行了DNA序列测定，根据DNA序列测定结果对它们之间的同源性进行了分析。结果表明，所测定的7个香菇栽培品种之间的亲缘关系非常近，同源性很高。通过聚类分析，根据香菇之间的亲缘关系，可以将这7个品种分为2类，即苏香，939和9311为一类，26，申10，135和7402为一类。     

对《一起未经兽医执业注册从事动物诊疗活动案的查处与思考》的商榷

加强对执业兽医的管理,有助于规范动物诊疗监管秩序和维护公共卫生安全。本文针对一起未经兽医执业注册从事动物诊疗活动案,从执法对象、罚没违法所得的认定以及法律适用等方面进行了辨析,围绕案件处置提出了不同观点。对相关法律条文的实用性和衔接性提出了思考,如法律法规可操作性不强,条款设置存在缺陷,对法律适用的解释不明确等,以期为法律法规的完善及执法实践提供参考。     

2017年北京市猪伪狂犬病血清学调查

为了解北京市猪伪狂犬病野毒感染情况,2017年从北京市7个区157个养猪场（户）,采集5 469份猪血清样品,采用猪伪狂犬病病毒（PRV）gE抗体酶联免疫检测试剂盒进行血清学调查。结果显示：北京市7个区均有不同程度的PRV野毒感染,平均样品阳性率为53.36%。其中：经产母猪阳性率最高（58.28%）,其次是育成猪（57.55%）、育肥猪（54.49%）,后备母猪阳性率最低（37.46%）;散养户的样品阳性率较高,为66.42%,规模猪场的阳性率较低,为47.71%。调查结果表明,北京市PRV野毒感染较为严重,对猪场采取伪狂犬病净化和综合防控措施势在必行。     

Regulatory effect of salicylic acid and methyl jasmonate supplementation on ergosterol production in Hericium erinaceus mycelia

We evaluated the biomass and ergosterol content of Hericium erinaceus mycelium, and extracellular enzyme activities in H. erinaceus liquid culture following salicylic acid(SA) and methyl jasmonic acid(Me JA)supplementation. The optimal SA concentration was100 lmoláL-1, where the highest ergosterol content of 2.33 mgág-1was obtained following 6-day cultivation with100 lmoláL-1SA supplementation, and which was significantly higher than the unsupplemented control(p \ 0.01). Following 4-day supplementation with50 lmoláL-1Me JA, the highest ergosterol content obtained was 1.988 mgág-1, which was 25.8 % higher than the unsupplemented control. Our data indicate that SA and Me JA supplementation improves ergosterol content in H.erinaceus mycelium.     

城镇化发展中的小城镇特色建设问题研究

集中发展小城镇是我国城镇化发展的一个重要选择。当前我国小城镇特色建设面临着特色挖掘不突出、特色彰显能力弱、基础设施公共服务功能弱、创新精神不足以及缺乏活力等问题。小城镇特色建设必须坚持以适合人民生活为宗旨，以大中城市周边合理布局为基础并注重乡土重建，充分发挥原住民在小城镇特色挖掘上的主体作用，注重通过创新精神去激活发展动力，在保护和开发并重的前提下发挥政府搭建平台、城镇居民共同参与、开发资本“走进来”的三方协同作用来加强小城镇特色建设。     

Estimating spatial mean soil water contents of sloping jujube orchards using temporal stability

Estimating spatial mean soil water contents from point-scale measurements is important to improve soil water management in sloping land of semiarid areas. Temporal stability analysis, as a statistical technique to estimate soil water content, is an effective tool in terms of facilitating the upscaling estimation of mean values. The objective of this study was to examine temporal stability of soil water profiles (0–20, 20–40, 40–60 and 0–60 cm) in sloping jujube (Zizyphus jujuba) orchards and to estimate field mean root-zone soil water based on temporal stability analysis in the Yuanzegou catchment of the Chinese Loess Plateau, using soil water observations under both dry and wet soil conditions. The results showed that different time-stable locations were identified for different depths and the temporal stability of soil water content in 20–40 cm was significantly (P < 0.05) weaker than that in other depths. Moreover, these time-stable locations had relatively high clay contents, relatively mild slopes and relatively planar surfaces compared to the corresponding field means. Statistical analysis revealed that the temporal stability of root zone soil water (0–60 cm) was higher in either dry or wet season than that including both, and soil water exhibited very low temporal stability during the transition period from dry to wet. Based on the temporal stability analysis, field mean soil water contents were estimated reasonably (R² from 0.9560 to 0.9873) from the point measurements of these time-stable locations. Since the terrains in this study are typical in the hilly regions of the Loess Plateau, the results presented here should improve soil water management in sloping orchards in the Loess Plateau.