新疆多浪羊FecB突变检测及与产羔数的关系

骨形态发生蛋白受体IB基因(BMPR-IB)FecB突变是影响布鲁拉美利奴和小尾寒羊高繁殖力的主效基因.本研究采集产双羔及以上的多浪羊(Ovis aries)母羊135只及后代羔羊血样共353份,公羊血样211份,利用PCR-RFLP技术检测FecB突变,并分析不同基因型个体母羊的产羔数.结果表明:在多浪羊群体中检测到BB、B+和++基因型,基因型频率分别为0.005,0.146和0.849.B+型多浪羊产羔数均值比++型多0.51只(P<0.01),BB型多浪羊产羔数分别与B+和++型差异不显著.多浪羊群体在FecB位点上处于Hard-Weinberg平衡状态,表明在该位点上没有受到选择的影响.本研究首次在新疆多浪羊群体中发现了FecB突变BB基因型公、母羊个体(1只公羊和2只母羊),揭示多浪羊多羔产生的机理可能与布鲁拉美利奴和小尾寒羊相同,在生产过程中可以根据携带FecB突变的情况开展选种选配,组建多浪羊肉用高繁品系.     

温差发电装置在单缸柴油机上的应用

对温差发电装置中的主要器件热电转换模块进行了热电耦合模拟并在单缸机上进行实验验证,温差的大小是决定发电效率的直接因素之一。对热电模块在温差发电装置上的安装以及装置在单缸机排气管上的安装做系统分析。设计恒压电路,使温差装置所回收的电能有效的充入蓄电池。当电路中的电流达到1A时,24块热电模块能回收132W的能量,相当于额定功率的1%。     

“中国春”小麦不同缺体的RAPD分析

利用ＰＣＲ－９０Ａ型ＤＮＡ扩增仪，对７个中国春小麦缺体核ＤＮＡ进行了扩增。结果显示，中国春小麦缺体核ＤＮＡ的ＲＡＰＤ产物可分为二种类型：（１）所有供试材料均能扩增出的片段，代表了核ＤＮＡ在进化上的保守性。有一个引物检测到这类片段。（２）全部供试材料间存在的差异片段，这类片段是用来基因定位的主要依据。另外，建立中国春小麦缺体系统的ＲＡＰＤ指纹图谱对研究小麦的系统进化也将有重要意义     

R~*树结点的主元分界分裂方法

为降低R*树结点重叠度,提高其空间利用率,通过结点特征点集方差及各子特征点集方差之和建立主元分析和结点分裂之间的联系,基于主元分析算法对特征点集进行降维处理,计算特征点集的主元向量,过特征点集中心且正交于该向量建立分界面对特征点集进行划分,将各簇数据的中心作为结点分裂的初始分裂中心,实现R*树结点分裂。实验证明,该算法具有较高的结点分裂效率,使得R*树结点重叠度降低,分裂结果较合理,显著提高了R*树构造效率和k近邻查询效率。     

Rearing conditions affected responses of weaned pigs to organic acids showing a positive effect on digestibility,microflora and immunity

Three experiments were conducted to assess the response of weaned pigs to organic acid SF3, which contains 34% calcium formate, 16% calcium lactate, 7% citric acid and 13% medium chain fatty acids. Dietary treatments had no effect on growth performance of piglets (21‐day weaning) fed the commercial prestart diet for 1 week before receiving the experimental diets supplemented with SF3 at 0, 3 or 5 g/kg diet (Exp. 1), whereas diarrhea frequency averaged across a week was decreased by SF3 supplementation (5 g/kg diet) in piglets fed the experimental diets immediately after weaning (Exp. 2). In Exp. 3, piglets (28‐day weaning) were fed the control (containing pure colistin sulfate and enramycin, respectively, at 20 mg/kg diet) for 1 week and then were fed the control or SF3‐supplemented (5 g/kg diet) diet for 2 weeks. The SF3‐fed piglets had greater apparent ileal digestibility of calcium and dry matter, while also demonstrating greater overall gross energy, up‐regulated jejunal expression of sodium‐glucose cotransporter‐1 and transforming growth factor‐β, down‐regulated jejunal expression of tumor necrosis factor (TNF)‐α, higher ileal Lactobacillus, with lower total bacteria content, lower plasma TNF‐α but higher IgG levels than the control‐fed piglets. Collectively, SF3 consumption improved diarrhea resistance of weaned pigs by improving nutrient digestibility, piglet immunity and intestinal bacteria profile. © 2016 Japanese Society of Animal Science     

山西省小杂粮生产病害防治现状评价

采用文献资料法和现场调查相结合的方法,研究了山西省小杂粮谷子、糜子、荞麦、莜麦、绿豆传统生产过程中的病害防治现状.结果表明,5种小杂粮的常见病害共23种,其中6种病害的化学防治中使用了绿色食品禁用药品,且大多数病害防治以化学防治为主.提出加强农业防治,优先物理防治,提倡生物防治,巧用化学防治,使其生产过程真正符合绿色食品生产的要求.并建议根据绿色食品病害防治要求,更新相关教材、专著病害防治内容.     

高粱不同外植体离体培养

不同材料愈伤组织诱导培养结果表明，幼穗，茎尖和成熟胚的最高出愈率达１００％，子粒达９３％，幼胚仅为７４％。幼穗不但出愈率高，且愈伤组织胚性状况好，分化出苗率高。幼胚出愈率虽低，但其分化率明显主茎尖，成熟胚和子粒了的分化率。     

Analysis of the Game Model of Supervision on Swindle in the Securities Market

Swindle exists commonly in any securities markets, where swindle has led to serious influences on regulations and the normal development of our securities market. The paper attempts to develop a game model of supervision on swindle in the securities market so as to investigate the relationship between supervisor and supervisee from the microcosmic aspect, and analyze the microcosmic mechanism resulting to swindle in the securities market, and enlighten our securities supervision as to swindle in the securities market.     

Experimental Study on the Extended Length of Negative Reinforcement Cut-in Phases in Continuous Beams

In this paper through the static loading tests of 6 inflexion zones and 2 cantilever zones in full-size constrained R/C beams, the stress performance in rebars cut-in-phases and subjected to negative moment is studied. The stress properties of extended length of rebars with different shear-span ratiosare analysed on basis of the full measurement of strain distributions combined with the investigation on state and regularity of the diagonal cracks development and series of new knowledge are obtained. It is found that current Concrete Design Code provisions on the extended length are inadequate for the high shear-span ratio and superfluous for the low shear-span ratio. The theoretical and experimental foundations are provided for determining proper value of extended length for rebars cut-in-phases.