共查询到20条相似文献,搜索用时 15 毫秒
1.
应用焦锑酸钾原位定位法对大熊猫精子获能和顶体反应过程中进行钙定位研究,发现未获能精子的 Ca2+主要结合于顶体前区和赤道段质膜外侧和顶体内膜内侧(核膜侧);随着获能的进行,Ca2+进入精子内部并主要结合于顶体区质膜内侧和顶体外膜外侧;顶体反应的精子,Ca2+结合于顶体内膜外侧、顶体后区质膜外侧和分散存在于释放的顶体内容物中,有些顶体反应精子的顶体内膜外侧结合的Ca2+特别丰富。精子尾部的Ca2+主要分布于中段线粒体内,且其内所含Ca2+含量随着获能和顶体反应而增加。另外尾部致密纤维和轴丝处也有少量Ca2+分布。 相似文献
2.
3.
选择活率高的精子并进行体外获能是开展猕猴体外受精研究的必要程序, 是研究猕猴受精生物学的重要手段。本实验采用上浮法和Percoll 梯度离心法对猕猴精液进行了优选, 并对处理后的精子形态正常率、精子活率、密度及受精率作了比较, 发现二者差异不显著; 用dbcAMP 和咖啡因使精子获能, 发现只有两种获能剂同时存在才能使猕猴精子获能并使卵母细胞受精。结论为: 上浮法和Percoll 法都是有效的精子优选法, 对受精率的影响差异不显著; dbcAMP 和咖啡因在猕猴精子体外获能时缺一不可。 相似文献
4.
猪精子体外获能与顶体反应的超微结构研究 总被引:5,自引:0,他引:5
用4种方法,检测了猪精子体外获得的效果。结果证明:高离子浓度的前培养液和猪镦泡液,具有促进获能过程的作用,实验还获得了获能后顶体反尖的一些重要的形态学变化资料,包括质膜的膨胀、断裂、顶体膨胀、顶体外膜内陷或原位局部囊泡化,质膜再全部丢失。顶体内膜直到与卵母细胞质膜融合,才发生可见的变化。受精过程无论体内或体外,都容易发生多精入卵,体外受精则更甚。在精子穿过卵丘细胞之间时,一方面开始进行顶体反应,另 相似文献
5.
应用扫描电镜和镜射电镜能谱技术,为猪精子获能前后质膜表面和内部的离子成分进行了研究,结果表明,猪精子获能后质膜表面的Na~+和Al~(3+)升高,而Cl~-和Ca~(2+)降低;精子顶体内Na~+和Cl~-降低,Ca~(2+)、K~+和Fe~(2+)升高;中段线粒体内的Na~+、Ca~(2+)和Fe~(2+)升高,而K~+和Cl~-降低。文章分析了精子获能后顶体内Na~+、Cl~-、K~+、Ca~(2+)和Fe~(2+)变化的浓度比和摩尔比。 相似文献
6.
系统研究了作用浓度、时间和温度以及输卵管上皮细胞和卵丘细胞对肝素处理山羊精子体外获能后的精子活力、质膜完整性、顶体完整率、获能比例及受精和卵裂的影响,为改善山羊精子体外获能效果和研究获能机理提供了必要的数据。主要实验结果如下:1、在获能液中添加5、10、25、50和100μg/mL肝素处理45min时,添加50和100μg/mL肝素精子获能比率最高(分别为55%和56%),但添加100μg/mL肝素处理后顶体完整率明显(P<0.05)低于对照组。说明山羊精子获能的最佳肝素浓度为50μg/mL。2、肝素作用时间(0, 10, 20, 30, 45, 60 和120 min)的延长,获能精子比例逐渐提高。其中,肝素处理45~120 min各组的获能精子比例差异不显著(P>0.05),处理120 min组的精子活力和质膜完整率显著低于其它各组。说明50μg/mL肝素处理精子获能的最佳时间是45~60 min。3、在42℃和38.5℃下处理时,获能精子比例显著高于15℃和37℃,但42℃处理后精子活力和顶体完整率显著低于其它温度。因此,385℃为山羊精子获能的最佳温度。4、与输卵管上皮细胞共培养获能精子比例显著高于对照组和卵丘细胞组,但精子活力、质膜完整率和顶体完整率差异不显著。输卵管上皮组的受精率(91.3%)和卵裂率(72.2%)显著高于对照组(81.2%,65.0%)。说明与输卵管上皮细胞共培养能显著提高肝素处理山羊精子体外获能的效果。 相似文献
7.
8.
9.
本文采用He—Ne激光处理绵羊精液,通过测试精于超弱化学发光强度、TST染色,以了解精子代谢的变化,观察精子顶体反应的发生情况,进一步从受精学角度了解激光的辐照效应。 相似文献
10.
11.
Michael Eisenbach 《Genesis (New York, N.Y. : 2000)》1999,25(2):87-94
Much progress has been made in recent years in establishing mammalian sperm chemotaxis and understanding sperm capacitation. Thus far, chemotaxis to follicular fluid has been established by a variety of means in human and mouse spermatozoa. It was found that only a small fraction of a given sperm population (averaging around 10%) is chemotactically responsive and that this fraction constitutes capacitated (ripe) spermatozoa. Both the chemotactic responsiveness and the capacitated state are transient (with a lifetime of 50 min to 4 h) and they occur only once in the sperm's lifetime. It has been proposed that the role of sperm chemotaxis in mammals (at least in humans) is selective recruitment of capacitated spermatozoa for fertilizing the egg, and that the role of the continuous replacement of chemotactic/capacitated spermatozoa is to prolong the time during which capacitated spermatozoa are available in the female reproductive tract. The sperm chemoattractants have not been identified, but they appear to be heat‐stable peptides. Although the molecular mechanism and the in vivo location of sperm chemotaxis are not known, a number of possible mechanisms and locations are discussed. Dev. Genet. 25:87–94, 1999. © 1999 Wiley‐Liss, Inc. 相似文献
12.
Chung W. Lui Randall J. Mrsny Stanley Meizel 《Molecular reproduction and development》1979,2(3):207-211
Suspensions of nearly 100% viable golden hamster sperm were prepared by passing washed cauda epididymal sperm through a column of 0.25–0.3 mm glass beads. Incubations of these viable sperm under in vitro capacitation conditions in volumes of 0.1 or 1 ml (2–2.5 × 106/ml) resulted in 85–92% viable sperm after four hours and 45 minutes of incubation. More than 70% of these sperm were judged to have been capacitated after four hours and 45 minutes of incubation on the basis of their having undergone acrosome reactions and the presence of high numbers of sperm exhibiting the activated motility characteristic of capacitated hamster sperm. Thus, for the first time, procedures are available that will yield large numbers of viable capacitated sperm for biochemical analysis and that will also allow other studies of hamster sperm capacitation with minimum interference from molecules released from dead sperm. 相似文献
13.
Mina Ojaghi John Kastelic Jacob Thundathil 《Molecular reproduction and development》2017,84(5):376-388
14.
15.
大熊猫DNA指纹分析材料的初步研究 总被引:11,自引:2,他引:11
以圈养大熊猫4个家系,13只个体的31份粪便,尿液以及甲醛固定的睾丸组织等作材料,输出血液,被毛进行DNA指纹分析,结果表明,同一个体的血液,被毛,粪便,尿液,以及甲醛固定的睾丸组织材料的DNA指纹图谱完全一致。 相似文献
16.
This paper first reports that the contents of slgA, IgC and IgM of 3 giant pandas'colostrums from day 1 to day 14 unconsecutively which have been determined by the method of “A Rate Nephelometer for Measuring Specific Protein by Immunopmciptin Reaction”. The results indicated that slgA is the most important immunuoglobulins of giant panda's colostmms, and IgG, IgM are also the major components of giant panda's colostrums. The contents of immunoglobulins in colostrums of giant pandas vary with the day : 1) the content of colostral sIgA is in the highest level (1 442.93 mg/dl) in 1st day, and maintains a higher level (1 200- 1 300 mg/dl) from 2nd day to 5th day, it drops abruptly in 7th day (727.61 mg/dl) ; 2) the content of colostral IgG is in the hingest level (861.5 mg/dl), and maintains in a higher level(648.74- 707.07 mg/dl) from 2nd day to 5th day, but drops abruptly in 7th day (375.14 mg/dl) ; 3) the content of colostral tgM varies rarely and maintains in a stable level during the first postpartum 5 days, and drops abruptly in 7th day . Based on the changes of immtmoglobulins in giant panda's milks, the author conclude that milks from 1st day to 5th day postpartum should be giant panda's colostrums. 相似文献
17.
马边大风顶自然保护区大熊猫对竹类资源的选择利用 总被引:22,自引:1,他引:22
本文对凉山山系大熊猫对竹子资源选择利用进行了研究,发现对不同的竹类有不同程度的选择性。最喜食大叶筇竹和白背玉山竹,几乎不选择刺竹子;就大叶筇竹而言,喜食基径大于10mm的幼竹竹茎,特别喜食基径大于18mm的竹笋;就白背玉山竹而言,喜欢选择基径大于12mm的竹茎和基径大于16mm的竹笋,但对白背玉山竹的老嫩无明显选择。 相似文献
18.
大熊猫妊娠及产仔行为观察 总被引:1,自引:0,他引:1
对人工饲养下8 只次怀孕产仔大熊猫的妊娠反应、产仔行为和7 只次配种未孕大熊猫行为进行比较研究表明, 受配雌兽到一定时间后摄取窝头情况可作为判断是否怀孕及预测产期的重要行为指标。怀孕产仔大熊猫和假孕大熊猫都有类似的反应: 减食, 拒食窝头、竹, 活动量明显减少, 乳房、外阴发生较大变化, 舔外阴、含竹作巢等。但前者拒食窝头并持续到产后一段时间, 后者有的在拒食窝头的中途出现摄食窝头的行为; 有的减食或拒食不久又摄食窝头- 再拒食- 再摄食, 活动量减少, 外阴、乳房仅有微弱变化。产仔大熊猫的预产期在减食窝头后25 天左右或拒食窝头后的21 天左右。大熊猫产仔期破羊水次数与每胎产仔只数有关。 相似文献
19.
20.
以大熊猫子宫为材料分离纯化了钙调素(Calmodulin,CaM),经SDS-PAGE,PAGE和等电聚焦电泳鉴定,表现均一。分子量为18800道尔顿,等电点为3.6。该蛋白质分子的N-末端为封闭的。大熊猫子宫钙调素具有其它来源钙调素所特有的一些性质。对环核苷酸磷酸二酯酶有明显的激活作用,还发现对超氧化物歧化酶也有一定的激活作用。电泳行为受Ca~(2+)影响而出现特征性电泳改变,在含有Ca~(2+)的SDS凝胶电泳中,电泳速度比EGTA存在对略快,在PAGE中,有Ca~(2+)比无Ca~(2+)对电泳速度略慢。大熊猫子宫钙调素的氨基酸组成中,Phe/Tyr为8:2,可观察到钙调素特征性紫外吸收光谱。 相似文献