动静磨盘式薏苡脱壳试验台设计与试验

薏苡脱壳多采用主粮加工业的一些通用设备,专业加工技术装备缺乏,存在物料品种适应性差、一次脱净率低、破损率高、作业效率低等诸多问题。为找出薏苡脱壳的脱壳方法,针对其物料特性和脱壳要求,分析对比主要的脱壳方法,设计一种动静磨盘式薏苡脱壳机构并进行试验,为薏苡脱壳装置的优化设计提供依据。     

Free choice feeding of whole grains in meat-type pigeons: 1. effect on performance,carcass traits and organ development

1. The effects of 5 different feeding systems on the performance, carcass traits and organ development were studied in pigeon squabs.

2. The 5 treatments were (1) whole grains of maize, pea and wheat plus concentrate feed; (2)whole grains of maize and wheat plus concentrate feed (CWC); (3) whole grains of maize and pea plus concentrate feed; (4)whole grain of maize plus concentrate feed (CC); and (5) compound feed (CF).

3. Feed intake of parent pigeons increased significantly from 0 to 21 d and it was higher in the CF treatment. Body weight of squabs in the CWC treatment was the highest among the 5 treatments in 4 weeks. Body weight losses of parental pigeons during the rearing period were not significantly different among the 5 treatments.

4. Protein intake in CC and CWC treatments was lower than that of the other three treatments. The CWC treatment had the highest daily weight gain and the lowest feed conversion ratio. Treatments were statistically similar in the relative weight of carcass, breast and thigh. CF had the lower relative weight of abdominal fat.

5. Relative weight of gizzard in the CF treatment was significantly lower than that of CWC.

6. It was concluded that the application of free choice feeding of whole grains of maize and wheat plus concentrate feed increased the body weight of 28-d-old pigeon squabs and decreased the feed conversion rate of parent pigeons. This feeding strategy could be commercially interesting in meat-type pigeon production.

     

二化螟dsRNA降解酶基因的克隆与表达分析

为解析二化螟Chilo suppressalis体内参与降解双链RNA(double-stranded RNA,dsRNA)的关键核酸酶的功能,克隆二化螟不同的非专一性核酸酶（non-specific nuclease,NUC）基因,并对这些基因进行生物信息学分析和组织定量表达分析,同时对dsRNA降解酶（dsRNA degrading nuclease,dsRNase）活力的组织分布进行研究。结果显示,共克隆获得5个NUC基因,其中有4个编码dsRNase亚家族基因（CsdsRNase1～CsdsRNase4）和1个编码Endonuclease G亚家族基因（CsEndoG）。5个NUC基因的开放阅读框核苷酸序列长度范围为828～1 338 bp,编码275～445个氨基酸残基,其分子量大小为31.68～49.57 kD,预测等电点为5.48～9.42。CsdsRNase1和CsdsRNase2含有信号肽序列,两者相似度极高,且与家蚕Bombyx mori和斜纹夜蛾Spodoptera litura中具有dsRNA降解酶活力的dsRNase同源聚类;CsdsRNase1和CsdsRN...     

中药“增免散”对免疫抑制鸡免疫功能的影响

将300只1日龄雏鸡随机分成正常对照组、中药“增免散”组、环磷酰胺组、环磷酰胺组 左旋咪唑组、环磷酰胺 “增免散”组,6日龄用鸡新城疫LaSota疫苗免疫点眼滴鼻,14、21、28、35日龄测定鸡血液ND抗体效价、免疫器官指数、细胞免疫功能、红细胞免疫粘附功能等,探索中药“增免散”的免疫增强机理。结果表明:中药“增免散”不但能显著提高Lasota活苗接种雏鸡的特异性HI抗体水平,延长其持续时间,能促进雏鸡免疫器官的生长发育,能显著增高雏鸡外周血T淋巴细胞ANAE阳性率,并对雏鸡红细胞免疫粘附功能具有显著促进作用,而且对环磷酰胺的免疫抑制有部分拮抗作用。     

稻米营养品质的研究现状及分子改良途径

本文综述了稻米营养品质(蛋白质、赖氨酸和微量营养素)的经典遗传学和分子遗传学、分子育种的研究现状，并对利用分子标记辅助育种方法提高稻米营养品质作了展望。     

Experimental Study on the Deformation Characteristics of Fine-Sandstone Under the Loading and Unloading Conditions

The deformation characteristics of the fine-sandstone is studied under the loading and unloading conditions at the three different deformation-rates and the two different stress-levels. The experimental results show that there is really the plastic-loop in the deformation curve for the loading deformation curve is different from the unloading deformation curve. But the plastic-loop is nearly unchangeable since the second circulate loading. The residual-deformation is be almost zero since the second circulate loading, and that the slope of the deformation curve increases as the deformation-rate increases, and that the residual-deformation increases as the stress-levels increases.