Objective: To assess the developing potentiality of mouse morula produced in vitro or in the after vitrification and to evaluate the effect of one-step and two-step vitrification methods. Method: Mouse morula produced...Objective: To assess the developing potentiality of mouse morula produced in vitro or in the after vitrification and to evaluate the effect of one-step and two-step vitrification methods. Method: Mouse morula produced in for and in the were vitrified in the solution containing ethylene glycol, Ficoll and sucrose (EFS solution) with one-step and two-step methods. The developing potential and status of the pellucid zona in vitified mouse morula were assessed. Results: The percentages of morula developed into blastocyst stage were 81. 8% and 82.4%, 97. 3% and 98.4%, respectively, after one-step and two-step exposure of in vitro morula or in vivo morula to EFS solution alone, which did not show significant difference compared to their controls (P > 0. 05). The percentage of in vitro morula developed into blastocyst vitrified by onestep method was significantly lower than that by two-step method and coned (P < 0.05, 70.6% vs 81 .3%; 70.6% vs 83 .6%, respectively). However, there was no significant difference between blastocyst rates of in vivo morula vitrified by one-step and two-step methods (P>0.05, 93. 1% us 95.7%). No rupture of pellucid zona was observed in all thawed morula after one-step and two-step vitrification, irrespective of in vitro morula or in vivo morula. Conclusion: Morula produced in vitro and in vivo after vitrification may maintain high survival rate and developing potential. Two-step vitrification method with EFS solution is suitable for in vitro morula, which can improve the developing potential of in vitro morula. Onestep and two-step vitrification method have no detrimennd effect on the developing potential of in vivo morula.展开更多
Objective To study the efficacy of two vitrification solutions for mouse morulae Methods Good morulaes of NIH mice were collected and used to test toxicity of the vitrification solutions EDS40 （40% ethylene glycol, 1...Objective To study the efficacy of two vitrification solutions for mouse morulae Methods Good morulaes of NIH mice were collected and used to test toxicity of the vitrification solutions EDS40 （40% ethylene glycol, 18% dextran and 0.5 tool sucrose） and EFS40 （40% ethylene glycol, 18% ficoll and 0.5 tool sucrose）. Fine vitrified morulae were packaged in 0.25 mL plastic straws and immersed into liquid nitrogen and cryopreserved for about 2-3 months. Then the straws were heated rapidly, washed in Ham＇s F12 medium and cultured. The viability was determined by morphology and blastocyst formation after being cultured for 48 h. Some embryos were transplanted to recipients after being cultured for 12-14 h. The number of pregnant recipients and young born was counted and analyzed by Chi-squared test. Results The toxicity of EDS40 solution was significantly lower than that of EFS40 （P〈0.05） and the number of embryos developed to the blastocysts after vitrification in EDS40 was significantly higher than in EFS40 （P〈0.05）. The number of zona pellucida and the number of pregnancy and birth integrated after vitrification cryopreservation had no significant difference between EDS40 and EFS40 （P〉0.05）. However, the embryo fineness rates after vitrification in EDS40 was significantly better than in EFS40 （P〈0.01）. Conclusion EDS40 solution has less toxicity and better cryoprotect effect on embryos than EFS 40.展开更多
In order to explore the relationship between soil moisture content and the severity of occurrence of Contarinia morulae Jiang,the effects of different soil types and moisture contents on the emergence rate of C. morul...In order to explore the relationship between soil moisture content and the severity of occurrence of Contarinia morulae Jiang,the effects of different soil types and moisture contents on the emergence rate of C. morulae were investigated. The results showed that soil moisture contents had a significant effect on the emergence rate of C. morulae. When the soil moisture content was 10%,the emergence rate of C. morulae was the highest in both soil types. When the soil moisture content was too high or too low,the emergence rate of C. morulae was significantly reduced. Within the suitable water content range,the emergence rate of C. morulae in sandy soil was significantly higher than that in sandy loam soil. The trend of emergence of C. morulae in the two soil types was basically the same. The number of adults of C. morulae began to increase slowly on March 18,peaked on March 28 and then peaked again on early April.展开更多
文摘Objective: To assess the developing potentiality of mouse morula produced in vitro or in the after vitrification and to evaluate the effect of one-step and two-step vitrification methods. Method: Mouse morula produced in for and in the were vitrified in the solution containing ethylene glycol, Ficoll and sucrose (EFS solution) with one-step and two-step methods. The developing potential and status of the pellucid zona in vitified mouse morula were assessed. Results: The percentages of morula developed into blastocyst stage were 81. 8% and 82.4%, 97. 3% and 98.4%, respectively, after one-step and two-step exposure of in vitro morula or in vivo morula to EFS solution alone, which did not show significant difference compared to their controls (P > 0. 05). The percentage of in vitro morula developed into blastocyst vitrified by onestep method was significantly lower than that by two-step method and coned (P < 0.05, 70.6% vs 81 .3%; 70.6% vs 83 .6%, respectively). However, there was no significant difference between blastocyst rates of in vivo morula vitrified by one-step and two-step methods (P>0.05, 93. 1% us 95.7%). No rupture of pellucid zona was observed in all thawed morula after one-step and two-step vitrification, irrespective of in vitro morula or in vivo morula. Conclusion: Morula produced in vitro and in vivo after vitrification may maintain high survival rate and developing potential. Two-step vitrification method with EFS solution is suitable for in vitro morula, which can improve the developing potential of in vitro morula. Onestep and two-step vitrification method have no detrimennd effect on the developing potential of in vivo morula.
基金This study was supported by Chongqing Medical Foundation of Science and Technology.
文摘Objective To study the efficacy of two vitrification solutions for mouse morulae Methods Good morulaes of NIH mice were collected and used to test toxicity of the vitrification solutions EDS40 （40% ethylene glycol, 18% dextran and 0.5 tool sucrose） and EFS40 （40% ethylene glycol, 18% ficoll and 0.5 tool sucrose）. Fine vitrified morulae were packaged in 0.25 mL plastic straws and immersed into liquid nitrogen and cryopreserved for about 2-3 months. Then the straws were heated rapidly, washed in Ham＇s F12 medium and cultured. The viability was determined by morphology and blastocyst formation after being cultured for 48 h. Some embryos were transplanted to recipients after being cultured for 12-14 h. The number of pregnant recipients and young born was counted and analyzed by Chi-squared test. Results The toxicity of EDS40 solution was significantly lower than that of EFS40 （P〈0.05） and the number of embryos developed to the blastocysts after vitrification in EDS40 was significantly higher than in EFS40 （P〈0.05）. The number of zona pellucida and the number of pregnancy and birth integrated after vitrification cryopreservation had no significant difference between EDS40 and EFS40 （P〉0.05）. However, the embryo fineness rates after vitrification in EDS40 was significantly better than in EFS40 （P〈0.01）. Conclusion EDS40 solution has less toxicity and better cryoprotect effect on embryos than EFS 40.
基金Supported by Social and People's Livelihood Sci-Tech Innovation Project of Chongqing City(cstc2016shmszx80014)Subsidy Fund for Development of Sericulture Industry in Chongqing(CQ2017CSE014)
文摘In order to explore the relationship between soil moisture content and the severity of occurrence of Contarinia morulae Jiang,the effects of different soil types and moisture contents on the emergence rate of C. morulae were investigated. The results showed that soil moisture contents had a significant effect on the emergence rate of C. morulae. When the soil moisture content was 10%,the emergence rate of C. morulae was the highest in both soil types. When the soil moisture content was too high or too low,the emergence rate of C. morulae was significantly reduced. Within the suitable water content range,the emergence rate of C. morulae in sandy soil was significantly higher than that in sandy loam soil. The trend of emergence of C. morulae in the two soil types was basically the same. The number of adults of C. morulae began to increase slowly on March 18,peaked on March 28 and then peaked again on early April.
