湖羊羔羊早期断奶前后瘤胃发酵与微生物区系的变化

本试验旨在研究湖羊羔羊早期断奶前后的瘤胃发酵与微生物区系变化,为幼龄反刍动物瘤胃发育变化理论以及羔羊的早期培育等提供依据。选择初生重接近的湖羊公羔(3.81 kg±0.55 kg)16只,1~7日龄饲喂母乳,8日龄与母羊分离,开始饲喂代乳粉(按8日龄体重的2%,分3次等量饲喂)和开食料(自由采食),35日龄断奶。分别于断奶前(21日龄)、后(42日龄)各选择5只羔羊进行屠宰,采集瘤胃内容物,测定瘤胃发酵、酶活和微生物区系。结果表明,断奶后羔羊的瘤胃总挥发性脂肪酸、乙酸、丙酸、丁酸及纤维素酶和α-淀粉酶活性均极显著高于断奶前(P<0.01)。断奶后瘤胃菌群多样性和丰富度均低于断奶前(P<0.05)。断奶前后的优势菌门均为拟杆菌门(Bacteroidetes)和厚壁菌门(Firmicutes),其中,拟杆菌门为第一优势菌门,在断奶前后分别占61.96%和65.36%,厚壁菌门为第二优势菌门,在断奶前后分别占32.08%和24.03%;两菌门之和在断奶前后分别占瘤胃总菌门的94.04%和89.39%。断奶前后的优势菌属均为unidentified_Prevotellaceae,分别占21.85%和38.49%。断奶前后羔羊瘤胃微生物的功能没有显著变化,都主要集中在复制和修复、碳水化合物代谢和翻译等途径。以上结果说明,羔羊早期断奶后的瘤胃发酵和酶活增强,菌群多样性和丰富度有所降低,在早期断奶前后的优势菌群和功能相似。     

Effect of Weaning Stress on Blood Physiology and Biochemistry Indexes and Immune Function in Dairy Buffalo Calves

To study the effect of weaning stress on dairy buffalo calves,5 healthy calves were chosen and weaned,and the blood samples were collected at 1 day before weaning,and 1,14 and 21 days after weaning to analysis blood physiology and biochemistry indexes and immune function.The results showed that the count of white blood cell,lymphocyte,erythrocyte,monocytes and hematocrit,aspartate aminotransferase activity,blood glucose,cortisol and immunoglobulin G contents of dairy buffalo calves were no significant difference between before and after weaning treatments (P > 0.05).The count of neutrophils at 21 d after weaning were significantly lower than that of 1 d before weaning of dairy buffalo calves (P < 0.05).However,lactate dehydrogenase and alanine aminotransferase activity in weaned treatments were significantly higher than those of animals in the treatment before weaning (P < 0.05).The serum urea nitrogen of dairy buffalo calves at 21 d after weaning was significantly higher than that of 1 d before weaning (P < 0.05) and hemoglobin content at 21 d after weaning was significantly lower than that at 1 day before weaning (P < 0.05).It indicated that the physiological and immunity function of dairy buffalo calves were challenged under weaning stress.     

我国黑果枸杞研究进展

黑果枸杞集药用价值、经济价值、生态价值于一体,开发应用潜力巨大。现从资源分布、栽培育种、化学成分、遗传学及产品加工等方面,对近年来我国黑果枸杞研究进行了综述,以期为黑果枸杞的进一步开发和利用提供参考依据。     

弱光胁迫对七个辣椒组合的生长发育及产量的影响

以驻马店市农业科学院园艺所近年来培育的7个辣椒组合(品种)为试材,利用遮阳网模拟弱光胁迫,调查了在弱光胁迫下辣椒植物学性状及产量性状,以株高、茎粗作为参考指标,以叶面积、比叶干质量作为重要指标,以产量、叶绿素a/b值作为主要指标,对其弱光耐受性进行了综合评价。结果表明:弱光逆境胁迫导致辣椒植株增高、茎秆变细、叶面积增大、比叶干质量降低、产量及叶绿素a/b值均降低;且叶绿素a/b值与产量的变化幅度基本一致,该方法可用来鉴定辣椒不同组合的耐弱光性能。     

Measurement and Analysis of Prestressed Concrete Flat Beam- Waffle Slab System During Prestressing

During the pre - stressing of the unbonded prestressed concrete wide flat beam - waffle slab system, the displacements and strains of slab and the prestressed concrete beams were site - measured and the results were analyzed. The prestressing construction was simulated by finite element program. The prestressing efficiency of the unbonded prestressed concrete wide flat beam - waffle slab system was discussed. It indicates that the prestressing efficiency was affected by the in -plane stiffness of slab.     

Two Types Modules for the Boiler Attached to 330 MW Unit

Boiler is an important facility in power plant , the safety and economy of unit is affected by it. Studying the dynamic of boiler can improve the knowledge about boiler , which is important for. Features of MMS are introduced based on MMS simulation setting, and the real time capable module and non real time capable module are compared from principle. Real time capable dynamic model of boiler and non real time capable dynamic model of boiler of 330 MW unit are established . The experimental results show that the dynamic process of two type model accords with the mechanism of the object , at the same time, the validity of real time capable module is discussed .     

植物新品种保护在企业科技进步中的作用

种子企业要在种子竞争中立于不败之地，就必须积极加快科研开发的步伐，全面启动品种创新，培育出更有竞争力的农作物新品种，才能使企业步入健康发展的轨道。同时对获得的植物新品种还应该认真加强保护，这样既保障了企业的应有权益，也激励了农业技术持续创新，规范了市场经济秩序，从而发挥知识产权为企业带来的经济效益，促使企业的科技进步。     

Practical Method of High-Speed Access for Medical Digital Image Sequences

The high-speed access for medical digital image sequences was restricted to special device and complicated system in the past. The authors present a new method of high-speed access for medical digital image sequences which can be performed on general computer by means of the combination of Serial ATA(SATA) and Redundant Array of Independent Disk(RAID).Then they introduce the scheme of system configuration and software program. Lastly the testing result is given and the speediness,cheapness and conveniency of this method are elucidated.     

An Information System for Vehicle Transport Management

This paper proposes a model framework, which describes the function requirements and the common characterstics of vehicle transport management. With the frame, a computer vehicle transportation managerment information system(QCMIS)is in troduced here and it has already been put into practice. The key technical points is also explained in the paper.     

Safeguarding Capability Index System of Regional Sustainable Development

According to the new requirement of sustainable development in the new stage, this paper puts forward the definition of the safeguarding capacity of regional sustainable development and uses some statistical methods of frequency statistics and principal component analysis to construct the index system of safeguarding capacity. Then it takes the data of the Three Gorges reservoir area for example to make empirical analysis, and provides efficient measurement tools to further measure the regional sustainability together with its safeguarding capacity, and therefore helps the government and the relevant organizations to establish more scientific policies of sustainable development.