随着Internet的飞速发展和应用的不断普及,网络专业课程在计算机专业课程中的地位越来越重要。想要学好网络专业课程,那么就必须熟练掌握网络课程中的实验,这也是提高学生学习能力与学习兴趣的重要环节。V M w are虚拟机可以在一台计算...随着Internet的飞速发展和应用的不断普及,网络专业课程在计算机专业课程中的地位越来越重要。想要学好网络专业课程,那么就必须熟练掌握网络课程中的实验,这也是提高学生学习能力与学习兴趣的重要环节。V M w are虚拟机可以在一台计算机上搭建网络进行各种网络实验,这样就大大降低了实验的成本,提高了学生在实验教学中的自主性。文中对VM ware在计算机网络教学中的应用进行研究,并阐述了在计算机网络实验中如何使用V M w are进行实践教学活动。展开更多
Aneuploidy embryos of Pinctada martensii Dunker are produced during tetraploid induction by inhibiting the first polar body in eggs from triploid fertilized with haploid sperms with cytochalasin B treatment. Chromosom...Aneuploidy embryos of Pinctada martensii Dunker are produced during tetraploid induction by inhibiting the first polar body in eggs from triploid fertilized with haploid sperms with cytochalasin B treatment. Chromosome analysis reveals that there are 88.18 ±6.79% aneuploidy embryos, and 28.70% aneuploids in pearl oysters of one-year age These aneuploids have five chromosomal conditions, such as 2n + 1(29), 2n + 2 (30), 3n-2 (40), 3n-1(41) and 3n + 1 (43). Results of growth measurement show that there is no significant difference between aneuploids (as a group) and diploids in body size and weight (p > 0.10), but the aneuploide is obviously different from triploid (p < 0.01). The mean body size and weight of aneuploids in diploid condition (2n ± 1 and 2n ± 2) are significantly smaller than those of diploids (p < 0.01),but aneuploids within triploid condition (3n ± 1 and 3n ± 2) are not smaller than diploids in body size and weight (p > 0.1).This study indicates Pinctada martensii Dunker could tolerate aneuploidy by 7 ~ 14% of the haploid genome, and that aneuploids of this species are viable under certain conditions.展开更多
文摘随着Internet的飞速发展和应用的不断普及,网络专业课程在计算机专业课程中的地位越来越重要。想要学好网络专业课程,那么就必须熟练掌握网络课程中的实验,这也是提高学生学习能力与学习兴趣的重要环节。V M w are虚拟机可以在一台计算机上搭建网络进行各种网络实验,这样就大大降低了实验的成本,提高了学生在实验教学中的自主性。文中对VM ware在计算机网络教学中的应用进行研究,并阐述了在计算机网络实验中如何使用V M w are进行实践教学活动。
基金supported by the"863"Project in China(#863-819-01-03)the Natural Science Foundation of Guangdong,China(#990315).
文摘Aneuploidy embryos of Pinctada martensii Dunker are produced during tetraploid induction by inhibiting the first polar body in eggs from triploid fertilized with haploid sperms with cytochalasin B treatment. Chromosome analysis reveals that there are 88.18 ±6.79% aneuploidy embryos, and 28.70% aneuploids in pearl oysters of one-year age These aneuploids have five chromosomal conditions, such as 2n + 1(29), 2n + 2 (30), 3n-2 (40), 3n-1(41) and 3n + 1 (43). Results of growth measurement show that there is no significant difference between aneuploids (as a group) and diploids in body size and weight (p > 0.10), but the aneuploide is obviously different from triploid (p < 0.01). The mean body size and weight of aneuploids in diploid condition (2n ± 1 and 2n ± 2) are significantly smaller than those of diploids (p < 0.01),but aneuploids within triploid condition (3n ± 1 and 3n ± 2) are not smaller than diploids in body size and weight (p > 0.1).This study indicates Pinctada martensii Dunker could tolerate aneuploidy by 7 ~ 14% of the haploid genome, and that aneuploids of this species are viable under certain conditions.