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水稻原品种"大力"以NaN3诱变方法获得了稳定突变体RM109.显微结构观察表明,RM109种子根外表根毛稀少且短小,无侧根发生,而"大力"品种则有侧根发生,且密生根毛.根毛观察比较显示,距种子根根端1 cm处的RM109根毛数是"大力"品种的19%,差异极显著,根直径与"大力"品种差异不显著;距根端8 cm处的RM109根毛数和根直径分别是"大力"品种的45%和79%,二者差异极显著;距根端3 cm处,RM109最大根毛长是"大力"品种的33%,差异极显著;RM109种子根根端到根毛发生区的长度,与"大力"品种的差异不显著. 相似文献
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猪卵巢体外保存温度对卵母细胞染色质构型和成熟能力的影响 总被引:2,自引:0,他引:2
Most porcine oocytes used in studies on embryo biotechnology and the in vitro production of embryos are currently obtained from the ovaries of slaughtered gilts. The duration and temperature during ovary transportation and handling might, therefore, affect the recovery of culturable COCs, chromatin configuration and developmental competence of oocytes. The effects of ovary storage temperature on chromatin configuration and in vitro maturation of porcine oocytes were examined in this study. Ovaries collected from a slaughterhouse were stored in vitro for 8 h under different temperatures. The results showed that more culturable COCs were isolated from the ovares stored at 39℃ than that from ovaries stored at 31℃ or 20℃ and before storage. Thirty-one centidegree was the best storage temperature in terms of cumulus expansion, nuclear maturation and morphology of the first polar body after in vitro maturation culture. The ability of cumulus expansion was completely lost in COCs derived from ovaries stored at 39℃ for 8 hours. Ovary storage (at both 31℃ and at 20℃ ) increased the proportion of oocytes with the GVc configuration in which chromatin condensed into a single big clump at the nucleolus and the functional significance of this configuration needs further investigations [ Acta Zoologica Sinica 51 (5): 919 923, 2005]. 相似文献
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为解决P53蛋白难以进入细胞内部发挥治疗作用的瓶颈难题.将p53基因融合插入带有9个精氨酸作为穿膜肽的表达载体中表达融合蛋白CPPs-P53,并与没有穿膜肽的P53蛋白进行比较,利用Western blotting方法检测蛋白的表达情况,MTT及Annexin V/PI双染法检测细胞生长抑制率及细胞凋亡率.Western blotting检测表明已成功在原核表达系统中表达融合蛋白CPPs-P53和P53蛋白,且蛋白纯度均已达到90%以上;MTT检测表明,P53蛋白对肿瘤细胞的生长虽有一定的抑制作用,但融合蛋白CPPs-P53与之相比,对肿瘤细胞生长的抑制效果显著增强,细胞生长抑制率有明显的提升,并且细胞生长抑制率呈现剂量依赖性;Annexin V/PI双染检测细胞凋亡情况也表明P53虽可以在一定程度上诱导肿瘤细胞的凋亡,但与P53蛋白相比较,融合蛋白CPPs-P53诱导的凋亡细胞明显增加,凋亡率是P53蛋白的2~3倍.由此说明在抑制肿瘤细胞的生长和诱导细胞凋亡方面,CPPs-P53比没有穿膜肽的P53蛋白的效果更显著. 相似文献
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非病毒载体转基因法,如注射裸DNA或脂质体转染,不产生细胞毒性,但除了肌肉组织外其他组织的转导效率均不高。电脉冲可使细胞膜产生临时的微孔允许一些分子通过,因此应用此方法可将药物或基因转入动物组织。电穿孔常用于培养的细胞转基因,理论上,低强度、长脉冲,或高强度、短脉冲有利于电转导,选择适合的参数是电转导的关键。本实验比较了不同电压和脉冲时间对小鼠卵巢在体转入绿色荧光蛋白基因的效果,确定了最适的电转导参数,为卵巢疾病的药物、基因治疗和研究卵泡发育中的基因调控提供了实验手段。超声波是临床常用的诊断方法,对人体无害… 相似文献
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