In the present paper we have observed the effect of discontinuous gradient two-step Percoll centrifugation on depleting mature T lymphocytes from normal bone marrow. The pre-/post-Percoll percentage of CD34+, and Leu4...In the present paper we have observed the effect of discontinuous gradient two-step Percoll centrifugation on depleting mature T lymphocytes from normal bone marrow. The pre-/post-Percoll percentage of CD34+, and Leu4+ cells in MNC was counted by using APAAP technique. As the two-step Percoll centrifugation is simple,and time saving, and decreases the incidence of contamination of cultured cells as well,This technique may be of value in serum-free culture of hematopoietic cells and immunological studies.展开更多
This study was designed to determine the effect of different sperm preparation treatments on yak sperm quality and in vitro embryo development.Frozen-thawed semen samples were treated using swim-up or percoll gradient...This study was designed to determine the effect of different sperm preparation treatments on yak sperm quality and in vitro embryo development.Frozen-thawed semen samples were treated using swim-up or percoll gradient centrifugation methods.Sperm concentration,progressive motility,recovery of motile sperm,membrane integrity,acrosome and chromatin integrity were scored and compared in recovered samples and controls.In addition,the effects of two sperm separation treatments on embryos capable of cleavage and in vitro development to the blastocyst stage were evaluated.Swim-up separated sperm showed a higher motility,while the concentration of spermatozoa recovered and percent recovery of motile sperm were higher with percoll gradient centrifugation separation.According to the optical and electron microscopies,swim-up produced higher percentage of sperm with intact plasma membrane and acrosome than percoll gradient centrifugation separation.However,there was no difference in the percentage of sperm with intact chromatin between two treatment groups.Cell numbers in the blastocysts of two groups were not different.The blastocyst rate was similar in both groups,whereas cleavage rate was higher when swim-up was used.展开更多
目的:评价1层和2层Percoll密度梯度离心法分离精子的效果。方法:20份精液标本分别行50%1层,90%和45%Percoll2层密度梯度离心分离,处理前后应用SCA(sperm class analyzer)精子质量分析仪分析精子密度、活力和圆形细胞密度。结果:1层法分...目的:评价1层和2层Percoll密度梯度离心法分离精子的效果。方法:20份精液标本分别行50%1层,90%和45%Percoll2层密度梯度离心分离,处理前后应用SCA(sperm class analyzer)精子质量分析仪分析精子密度、活力和圆形细胞密度。结果:1层法分离后精子回收率为(65.5±12.8)%,明显高于2层法(P<0.01);1层和2层法分离后a级精子百分率明显高于处理前(P<0.05,P<0.01),而1层法分离后a级精子百分率明显低于2层法(P<0.05);1层法分离精子后c级精子百分率明显高于2层法(P<0.05),与处理前相比没有明显差异(P>0.05);2层法分离后a+b级精子百分率明显高于处理前(P<0.05),1层法分离后a+b级精子百分率与处理前相比没有明显差异(P>0.05);1层和2层法分离后圆形细胞密度明显低于处理前(P<0.05,P<0.01),两种方法之间没有差异(P>0.05)。结论:1层法分离后精子回收率较高,精子的活力改变不大;2层法分离后精子回收率较低,精子的活力明显改善;1层和2层法都可以较好地把精子与圆形细胞分开。两种方法各有优势,在精子体外处理中都有着重要的应用价值。展开更多
文摘In the present paper we have observed the effect of discontinuous gradient two-step Percoll centrifugation on depleting mature T lymphocytes from normal bone marrow. The pre-/post-Percoll percentage of CD34+, and Leu4+ cells in MNC was counted by using APAAP technique. As the two-step Percoll centrifugation is simple,and time saving, and decreases the incidence of contamination of cultured cells as well,This technique may be of value in serum-free culture of hematopoietic cells and immunological studies.
基金supported by the National Natural Science Foundation of China(30871903)the Fundamental Research Funds for the Gansu Universities,China(2011)
文摘This study was designed to determine the effect of different sperm preparation treatments on yak sperm quality and in vitro embryo development.Frozen-thawed semen samples were treated using swim-up or percoll gradient centrifugation methods.Sperm concentration,progressive motility,recovery of motile sperm,membrane integrity,acrosome and chromatin integrity were scored and compared in recovered samples and controls.In addition,the effects of two sperm separation treatments on embryos capable of cleavage and in vitro development to the blastocyst stage were evaluated.Swim-up separated sperm showed a higher motility,while the concentration of spermatozoa recovered and percent recovery of motile sperm were higher with percoll gradient centrifugation separation.According to the optical and electron microscopies,swim-up produced higher percentage of sperm with intact plasma membrane and acrosome than percoll gradient centrifugation separation.However,there was no difference in the percentage of sperm with intact chromatin between two treatment groups.Cell numbers in the blastocysts of two groups were not different.The blastocyst rate was similar in both groups,whereas cleavage rate was higher when swim-up was used.
文摘目的:评价1层和2层Percoll密度梯度离心法分离精子的效果。方法:20份精液标本分别行50%1层,90%和45%Percoll2层密度梯度离心分离,处理前后应用SCA(sperm class analyzer)精子质量分析仪分析精子密度、活力和圆形细胞密度。结果:1层法分离后精子回收率为(65.5±12.8)%,明显高于2层法(P<0.01);1层和2层法分离后a级精子百分率明显高于处理前(P<0.05,P<0.01),而1层法分离后a级精子百分率明显低于2层法(P<0.05);1层法分离精子后c级精子百分率明显高于2层法(P<0.05),与处理前相比没有明显差异(P>0.05);2层法分离后a+b级精子百分率明显高于处理前(P<0.05),1层法分离后a+b级精子百分率与处理前相比没有明显差异(P>0.05);1层和2层法分离后圆形细胞密度明显低于处理前(P<0.05,P<0.01),两种方法之间没有差异(P>0.05)。结论:1层法分离后精子回收率较高,精子的活力改变不大;2层法分离后精子回收率较低,精子的活力明显改善;1层和2层法都可以较好地把精子与圆形细胞分开。两种方法各有优势,在精子体外处理中都有着重要的应用价值。