高粱IS1112C（A3）雄性不育胞质的育性恢复由两个基因转变成1个基因     

H．V．Tang  D.R.Pring  向平 《国外作物育种》2004,23(1):62-63

杂交高粱种子的生产取决于胞质核雄性不育性(CMS)的利用。目前广泛采用的高粱CMS资源是来自milo或雄性不育诱导的milo胞质组。载有该胞质的品系的育性恢复急需通过两个基因的互补作用机制来实现；1989年Sehertz等人研究了大量的高粱品系，  相似文献   

虾蛄属—一种新的动物蛋白     

Ravi.  V 谢荣华 《上海饲料》1997,5(1):9-10

  相似文献   

“摆环阵”——保证处女王交尾成功的妙法     

多伊尔  V 刘忠海 《中国蜂业》1994,(2):37-38

“摆环阵”──保证处女王交尾成功的妙法［美国］多伊尔，Ｖ．当您培育王台时，是否想到如何保证处女王都成功地交尾产卵呢？假如您对培育蜂王的这最后一步给以充分重视，就一定会育成更多的新蜂王。奇怪得很，告诫我们如何获得优质王台的资料比比皆是，而对于怎样组织交...  相似文献   

月见草的栽培新技术     

张铭远  田金华  董利  曲晓春  刘忠海  金光华 《人参研究》1992,(2)

月见草是吉林省特产之一,含主要药用成份r—亚麻酸最高。因国内外对月见草的进一步研究和应用,使需求量不断埔加,价格逐年上涨。月见草籽1989年2000元/T,1992年上升到7500元/T。由于野生资源采集过多,人为的抢青,使资源遭到严重破坏,供需矛盾突出。为使这一资源延续利用,人工仿自然栽培技术应运而生。月见草籽含油脂20％左右,草籽油中含有70—80％的亚油酸(不饱和酸),特别是含有特殊生理活性的r—亚油酸,对很多疾病有显著治疗效果,具有抗血栓、抗血小板集结、降低胆固醇、防治动脉硬化、冠心病糖尿病作用。对肥胖症、精神分裂症等有特殊疗效。国内对月见草的利用主要在医药、化妆品和疗效食品三大领域。我们在1988—1991年对月见草生物学特性进行了研究,解决月见草籽当年播种当年结实的问题。对其种籽采用不同方法(春化、冷冻、药剂)进行处理,并在老参地播种,获得成功。  相似文献   

土耳其香料烟草生产及其管理     

Ahmet  V. 顾冠军 《世界农业》1990,(2):39-39,32

80年代初,土耳其香料烟生产发展不快。1981年全国种植面积17.0万公顷,产量仅15万吨,80年代中期,由于国际上混合型卷烟和低焦油卷烟工业发展的需要,1988年,香料烟种植面积达30.2万公顷,香料烟生产量达27.05万吨,比1987年增加59.1％。土耳其的香料烟主要分布在爱琴海、黑海、马尔马拉海沿岸,丘陵地区和经济不发达地区。  相似文献   

The Change in the Leucocytic Formula by the Leucocytosis-promoting Factor of Exudates in Experimental Leucemia     

Menkin V 《Science (New York, N.Y.)》1948,107(2786):546-547

  相似文献   

RECENT PSYCHICAL RESEARCHES     

P V 《Science (New York, N.Y.)》1886,7(156):91-92

  相似文献   

优质蜂王与经济效益     

刘忠海  小韦弗 《中国蜂业》1993,(2):35-35,40

有关蜂王的经济效益的一个试验是“对6种商业蜂种的评价”,载于《美国蜜蜂杂志》1982年第2～4期,作者是明尼苏达大学的M.A.萨登和B.弗卡拉。该试验设计严密、操作合理,对当时广为使用的6个蜂种进行了两年的考察。这里我不想复述试验过程,只想指出;他们的试验证实了优质蜂王所带来的收益远远大于普通蜂王的。  相似文献   

Recovery of Mycoplasma spp. from the Reproductive Tract of the Mare during the Estrous Cycle          下载免费PDF全文

Bermudez V  Miller R  Johnson W  Rosendal S  Ruhnke L 《The Canadian veterinary journal. La revue veterinaire canadienne》1987,28(8):519-522

The sites in the genital tract from which mycoplasmas could be recovered at various stages of the estrous cycle were studied in five Standardbred mares naturally infected with Mycoplasma. Mycoplasma equigenitalium and Mycoplasma subdolum were most frequently isolated from the clitoral fossa as compared to the vagina, cervix, and uterus. The lowest isolation prevalence was observed in the uterus. The recovery of Mycoplasma spp. from the clitoral fossa did not differ at any stage of the estrous cycle; however, recovery from the vagina, cervix, and uterus was variable during the cycle and more organisms were recovered on the day of ovulation than at any other time. From these results it was concluded that the clitoral fossa is the most likely “ecological niche” for Mycoplasma spp. in the mare. Ureaplasmas were not isolated.  相似文献   

A formation mechanism for catalytically grown helix-shaped graphite nanotubes     

Amelinckx S  Zhang XB  Bernaerts D  Zhang XF  Ivanov V  Nagy JB 《Science (New York, N.Y.)》1994,265(5172):635-639

The concept of a spatial-velocity hodograph is introduced to describe quantitatively the extrusion of a carbon tubule from a catalytic particle. The conditions under which a continuous tubular surface can be generated are discussed in terms of this hodograph, the shape of which determines the geometry of the initial nanotube. The model is consistent with all observed tubular shapes and explains why the formation process induces stresses that may lead to "spontaneous" plastic deformation of the tubule. This result is due to the violation of the continuity condition, that is, to the mismatch between the extrusion velocity by the catalytic particle, required to generate a continuous tubular surface, and the rate of carbon deposition.  相似文献