我国西北地区苜蓿种子产业化发展优势与对策

我国西北地区发展苜蓿种子产业不仅具有得天独厚的资源优势,而且还具有较好的经济效益和巨大的生产潜力。由于长期对苜蓿种子生产不重视,苜蓿栽培历史虽然悠久,但迄今苜蓿种子生产同有形成较大规模的产业,种子商品化极低,种子生产资源优势还没有转变为经济优势,只有加快苜蓿种子产业化步伐,才能改变目前西北地区苜蓿种子生产的落后局面。     

陇东野生紫花苜蓿愈伤组织原生质体游离条件的筛选

以陇东野生紫花苜蓿子叶诱导的愈伤组织为材料,研究了酶解时间、酶液组合、酶液中甘露醇浓度、预处理措施及愈伤组织继代培养时间对其原生质体游离效果的影响.结果表明:当酶解时间为10h、酶液组合为2%纤维素酶+0.5%果胶酶+0.3%离析酶+0.3%半纤维素酶+0.3%崩溃酶、甘露醇浓度为0.60mol/L、预处理措施为CPW-10溶液中浸泡1h、愈伤继代培养天数为12～14d时,游离出的原生质体产量最高,可达19.5×105个/g,存活率高达89.7%.     

国际动物卫生组织重要标准的修订动态

我们于2005年5月在国际动物卫生组织(OIE)总部工作了一个月。在此期间,了解到了OIE重要标准的修订动态。为了使我国的各级兽医工作者对国际兽医规则有所了解,以便在动物防疫和动物卫生的实际工作中能够汲取借鉴,特将了解到的情况进行加工整理,以飨读者。1OIE《陆生动物卫生法典》1.1修订流程OIE陆生法典委员会管理处在每年7月的会议后起草更新版本的法典内容,然后发给成员国和邀约的专家提出意见,在次年1月下旬,法典委员会召开会议并将审查过的新的法典文本以报告方式公布,并进一步征求各方意见(意见截止为次年5月初),然后在5月下旬的…     

中药成分辛弗林对胶体金免疫层析法检测β-受体激动剂的影响

旨在探究陈皮、青皮、木瓜、厚朴、红景天等5种中药材提取液以及饲喂了陈皮和青皮的猪尿液胶体金免疫层析法检测结果呈阳性的原因。建立测定猪尿及中药提取物中辛弗林的LC-MS/MS检测方法,测定陈皮、青皮的提取物和饲喂陈皮、青皮后猪尿中的辛弗林浓度。用小鼠肝微粒体孵育CGIA检测呈阳性的陈皮、青皮、木瓜和厚朴4味中药提取物。饲喂陈皮和青皮后的猪尿液检出辛弗林,浓度分别为1.36和1.65 μg·mL^-1;在陈皮和青皮的提取复溶液中检出辛弗林,浓度分别为132.6和312.7 μg·mL^-1。厚朴和木瓜两种中药提取物经过肝微粒体孵育后,在2~5 h逐渐由CGIA检测阳性转为阴性,陈皮和青皮孵育后,0~6 h的结果均为CGIA检测阳性;阴性中药组CGIA检测均呈阴性,而添加辛弗林的阳性对照组0~6 h CGIA检测均呈阳性。猪较大剂量使用陈皮和青皮会引起猪尿β-受体激动剂CGIA检测出现假阳性,该假阳性现象跟中药成分辛弗林有关,体外试验中辛弗林不易被小鼠肝微粒体代谢。     

5种药剂对枸杞棉蚜室内毒力及田间防效

为了明确5种药剂对枸杞棉蚜的适宜施药剂量,开展了室内毒力测定和田间药效试验.结果 表明,1％甲维盐EC对枸杞棉蚜的毒力最高,50％噻虫嗪WG毒力最低,24 h LC50分别为2.44 mg/L和1875.69 mg/L.5种药剂毒力大小依次为甲维盐＞啶虫脒＞吡蚜酮＞呋虫胺＞噻虫嗪.田间试验结果表明,随着施药时间的延长,...     

Vehicle Monitoring Control and Scheduling Management System in a Scenic Area

In order to help tourists choose satisfying scenic spots, content hotels, convenient lines and convenient vehicles, vehicle monitoring control and scheduling management system in a scenic area is presented, which dispatches vehicle by appointments and the statistic of tourists at a sight spot and recommends the tour line by broadcasting in vehicle. Vehicle monitoring control and scheduling management system in a scenic area, a integrative vehicle management system, is an integration of GPS, GIS, trunked radio system, a management system of booking room and a tourist statistic system at a sight spot.     

Research on a Novel Inverter of VSC

In order to improve waveform performance of light HVDC system, a lot of switches which operate in high frequency are used, which causes large switching losses and results high cost. A new Buck type voltage source converter(BVSC) is proposed. The new BVSC comprises a dual-buck converter and a three-phase inverter operating in grid frequency. Only two high frequency switches are used, which results good output waveform performance. In order to reduce the high frequency switching losses, a novel improved double-frequency Buck type voltage source converter(DBVSC) is also proposed. An additional dual-Buck converter is added to the BVSC, the added dual-Buck converter deals with the fundamental power that operates in low frequency, and BVSC only deals with harmonic power that operates in high frequency. The output waveform is enhanced and the switching losses are reduced in DBVSC, and the power rating is also increased. The DBVSC is very suitable for large power rating application. The one cycle control theory is adopted to control the proposed DBVSC with analog circuit, which is very simple. The proposed DBVSC and control method are verified by simulation.     

Tentative Research About the Macroscopic Regulating to Blast

The paper analyzes the difference of the pathogenic varieties and the relationship of the variety composition,allording to the historic material to the varieties of the main hybid fece varieties in Southeast Sichuan during 1992 to 1998.It's the first time to advance to use the camparison on rate of pathogenic isolates between norm and refrieving to define the susceptible extent of the varity.It's an scientific base to adjust the structures of the vartieties,to reach the objective of the macroscopic regulating to rice blast.