“一评双授”十条开创“绵竹路径”新方向

近年来,四川省绵竹市全面贯彻中央、省委以及德阳市委实施乡村振兴战略重大决策部署,紧紧围绕“全省转型发展示范区、休闲度假目的地”战略定位,掀起了实施乡村振兴战略示范村评选热潮,总结出“‘一评双授’十条”在全绵竹市推广,走出了加快实施乡村振兴的“绵竹路径”。

城市轨道交通专业群现代学徒制的探索与实践

文章基于目前国内轨道交通类与非轨道交通类专业实施现代学徒制现状进行剖析,结合我校城市轨道交通专业群,开展现代学徒制的探索与实践,提出双授、双边鉴定等创新方法。

江苏省苏州市第三中学校 王德明

王德明,江苏省苏州市第三中学校教师,正高级教师,江苏省特级教师。江苏省教科研先进个人,苏州市名教师,苏州市学科带头人,苏州市姑苏区第二、三届人大代表。心无旁鹜存精锐,意有痴迷写春秋。--王德明他认为,课堂教学要让学生从“学会”走向“会学”,实现“渔鱼双授”。他擅长生成课堂教学,在教学中经常就地取材,不时将学生带入情境中,让学生在欢声笑语中实现对所学内容的理解。他将生活中的种种起承转合、根植于心的修养、天然的文化等都融于教学。

Comparison of growth and survival of larvae among different shell color stocks of bay scallop Argopecten irradians irradians(Lamarck 1819)

In order to improve production and breed new broods of bay scallop Argopecten irradians irradians, different-colored orange, purple and white lines were established by two mating methods of self-fertilization and mass spawning at a commercial scallop hatchery in spring, 2002. And then larval growth and survival of different lines was compared to test whether there is a relationship between shell color and growth and survival at early developmental stage. Both growth and survival have no significant differences among different experimental larvae of self-fertilization or mass spawning. Results are as following in the order of orange, purple and white shell stock. For the self-fertilization, growth rates of larvae were 6.174, 6.412, and 6.599 μm/d, respectively. Survival rates of larvae at Day 3 were 74.41%, 76.86%, and 82.05%; Day 6 were 49.14%, 65.63%, and 52.79%; and Day 9 were 25.06%, 20.80%, and 26.47%, respectively. For the mass spawning, the growth rates were 7.836, 7.941, and 7.878 μm/d, respectively. Survival rates at Day 3 were 93.05%, 91.95%, and 92.50%; Day 6 were 79.17%, 78.05%, and 82.50%; and Day 9 were 34.72%, 36.67%, and 38.33%, respectively. The absence of any relationship between shell color and growth and survival at the larval stage may be resulted from their common genetic basis.

Artificial induction of mito-gynogenetic diploids in large yellow croaker(Pseudosciaena crocea) by hydrostatic pressure

The present study investigated conditions for inducing mito-gynogenetic(endomitosis) diploids by hydrostatic pressure in the large yellow croaker Pseudosciaena crocea.In haploid control groups,the development of eggs was activated with ultraviolet radiated semen.All fry presented typical haploid syndrome in the haploid control groups,and were verified as haploids using cytometry.After hydrostatic pressure treatment,morphologically normal fry reappeared at different frequencies according to the intensity and time of pressure shock.Fry with normal appearance in the pressure treated groups were verified as gynogenetic double haploids(GDHs),containing only one allele from the female parent at all four diagnostic microsatellite loci.For a fixed duration of 3 min,the optimal intensity of blocking the first mitosis was determined to be 40 Mpa,which was similar to that of blocking the second meiosis.There was a "window" of starting time,from 36.1 min to 38.1 min post-insemination at 25.0±1.0°C,within which the production of GDHs was not significantly different.Maximum production of morphologically normal fries,9.36%±2.97% of developed eggs,was found when the eggs were shocked with hydrostatic pressure at 40 Mpa for 3 min,starting from 38.1 min post insemination at 25.0±1.0°C.

Heterochronic bilateral ectopic pregnancy after ovulation inductionHeterochronic bilateral ectopic pregnancy after ovulation induction

Ectopic pregnancy is identified with the widely-applied assisted reproductive technology （ART）. Bilateral ectopic pregnancy is a rare form of ectopic pregnancy which is difficult to be diagnosed at the pre-operation stage. In this paper, we presented an unusual case of heterochronic bilateral ectopic pregnancy after stimulated intrauterine insemination （IUI）, where there has been a delay of 22 d between the diagnoses of the two ectopic pregnancies. Literature was reviewed on the occurrence of bilateral ectopic pregnancy during the past four years in the MEDLINE database. We found 16 cases of bilateral ectopic pregnancy reported since 2008, and analyzed the characteristics of those cases of bilateral ectopic pregnancy. We emphasize that ovulation induction and other ARTs may increase the risk of bilateral ectopic pregnancy. Because of the difficulty in identification of bilateral ectopic pregnancy by ultraso- nography, the clinician should be aware that the treatment of one ectopic pregnancy does not preclude the occurrence of a second ectopic pregnancy in the same patient and should pay attention to the intra-operation inspection of both side fallopian tubes in any ectopic pregnancy case.