新型环氧树脂TEG-99的合成与性能研究初探     

沈敏敏  哈成勇 《林产化学与工业》2001,21(2):71-74

以松节油为原料合成了新型环氧树脂TEG－99，研究了它与常见胺类、聚酰胺类及酸酐类固化剂的固化反应和固化产物的性能。结果表明TEG－99环氧树脂的合成过程简单；其固化过程及产物性能与E－44环氧脂相当。  相似文献   

浅谈饲料分析实验课的教学与改革     

王金娥  哈玲津 《天津农学院学报》2004,11(Z1):76-78

为促进教与学的相互提高,进一步调动学生主动学习的积极性,提高学生实践的综合素质,结合我院的具体情况,从教学各个环节,总结并探讨了如何提高饲料分析实验课的教学质量,并提出了今后工作的几点改革设想.只有不断地改革创新,才能高品质、高质量地实现实践教学,才能培养出适应新世纪发展需要,具有实际开发和创新能力的人才.  相似文献   

An investigation of transovarial transmission of Akabane virus in Culicoides brevitarsis     

PG ALLINGHAM  HA STANDFAST 《Australian veterinary journal》1990,67(7):273-274

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天津山药种植模式初探     

李树和  赵冰  杨雅婷  郑久明  哈德卿 《长江蔬菜》2008,(12)

通过对天津宝坻山药进行高畦种植、平畦种植、低畦种植(对照)和打沟种植4种种植方式的试验比较,结果表明,打沟种植宝坻山药虽然块茎产品最长,产量较高,但由于产品畸形率较高,不适宜在该地区使用;相对于高畦种植宝坻山药来说,平畦种植和低畦种植的山药块茎产量较低、品质较差,不适宜使用;高畦种植是比较适宜的宝坻山药种植方式.  相似文献   

Equine anaesthesia‐associated mortality: where are we now?          下载免费PDF全文

Alexandra HA Dugdale  Polly M Taylor 《Veterinary anaesthesia and analgesia》2016,43(3):242-255

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Histological and immunohistochemical investigations of ovarian interstitial glands during non‐breeding season in camels (Camelus dromedarius)          下载免费PDF全文

MM Awad  RH Mohamed  YA Amin  HA Hussein 《Reproduction in domestic animals》2018,53(4):872-879

The aim of this was to investigate the histology and immunohistochemistry of interstitial glands during non‐breeding season in camel ovaries. A total of 21 mature, non‐pregnant and apparently healthy camels aged between 8 and 12 years were slaughtered. The ovaries were removed within 15 min, cleaned from adipose tissue, weighted and examined grossly. The histological preparation was made, and then, the blocks were cut at 3–5 microns thickness and stained by H&E for histological examinations. Moreover, some sections were stained with Sudan Black for lipid detection. Immunohistochemical analysis of paraffin‐embedded ovarian tissues was performed to detect the localization of S‐100, vimentin, progesterone receptors (PR) and oestrogen receptors (ER). Immunoreactive signals were detected using UltraVision Detection System. The results revealed that the interstitial glands were located in the cortical region and they were arranged in various arrangements either single, in couple or in groups rich in lipid droplet. All interstitial gland arrangements were enclosed by connective tissue capsules containing fibroblasts and collagenous fibres separated them from the surrounding ovarian structures. Both interstitial glands and their surrounding CT were penetrated by several blood vessels. There was a strong immunoreactive signal for S‐100 in the nuclei of interstitial cells, and no signals were detected either in cells of the interstitial glands or their connective tissue with PR. We could conclude that the interstitial gland is distinct in ovary of camel and further studies are needed to elucidate its rule in steroid synthesis.  相似文献   

EFFECTS OF ABSORBED DOSE, STORAGE TIME AND TEMPERATURE ON 2- DODECYLCYCLOBUTANONE IN IRRADIATED BEEF     

ZHANG Hai-wei  WANG Feng  ZHOU Hong-jie  ZHANG Qing-fang  HA Yi-ming 《核农学报》2008,22(6)

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欧拉型藏羊GH基因5′端侧翼序列多态性与生长性状的关联分析     

哈志俊  张利平  杨联  吴建平  刘晓敏  俞理辉  李文文 《甘肃农业大学学报》2010,45(4)

采用PCR-SSCP方法,检测了126只欧拉型藏羊GH基因5′端侧翼序列的遗传多态性,并与生长性状进行关联分析.结果表明:GH基因在5′端侧翼序列存在2个等位基因3种基因型;χ2检验表明,该群体在这一位点上处于Hardy-Weinberg平衡状态(P0.05),多态信息含量为0.152 2,属于低度多态(PIC0.25).与藏绵羊的基因序列(GenBank登录号:EF077162)相比,B等位基因在86bp、87bp处分别发生T→C和G→A的突变.关联分析表明:欧拉型藏羊BB基因型个体的体长、体高显著高于AA型和AB型(P0.05),不同基因型之间体重、胸深、胸宽、管围差异均不显著.  相似文献   

中微量元素对大兴区西瓜产量和品质的影响     

冯文清  王旭  哈雪娇  陈宗光 《现代农业科技》2010,(1):119-120

中微量元素对西瓜产量和品质的影响试验结果表明,施用中微量元素西瓜产量明显增加7.5%～24.1%,西瓜中心可溶性固形物含量提高0.3～2.0个百分点。综合西瓜产量、瓜瓤中心可溶性固形物含量及中微量元素的含量可知,1.0%硫酸亚铁溶液于伸蔓期、坐果期、果实生长盛期分3次喷施,可获产量62.69t/hm2,同时瓜瓤中心可溶性固形物含量为10.8%,铁、锌、硼和钙的含量较高,依次为6.02、0.59、0.70、10.0mg/kg,适宜在生产中推广应用。  相似文献   

纤维素-N-乙烯基吡咯烷酮辐射接枝共聚物的制备及其溶胀性研究     

张方娥  哈益明  王锋  李伟明  李安  唐洪涛 《核农学报》2012,26(3):594-601

采用共辐射法制备了纤维素-N-乙烯基吡咯烷酮接枝共聚物Cell-g-NVP。考察了辐照剂量、去离子水用量和NVP/纤维素质量比对接枝率的影响。结果表明,在去离子水用量及NVP/纤维素质量比一定的情况下,接枝率随辐照剂量的增加而增加,并逐步达到平衡;在辐照剂量和NVP/纤维素质量比一定时,接枝率在去离子水用量为2ml时达到最大;在辐照剂量和去离子水用量一定时,接枝率随着NVP/纤维素质量比增加而增加,并逐步达到平衡;通过正交试验,得到制备接枝共聚物的最佳工艺条件为:辐照剂量8kGy,去离子水用量4ml,NVP/纤维素质量比4∶1,此时得到的接枝共聚物接枝率为354.8%。正交试验结果也表明NVP/纤维素质量比对接枝率影响最大,其次是辐照剂量。红外光谱表明接枝反应发生在NVP乙烯基部位,接枝共聚物保留了NVP的内酰胺结构;热重分析表明其热稳定性得到了增强;通过溶胀性研究表明接枝共聚物的溶胀性得到增强,且持水性较好。  相似文献