Comparative growth and viability of hybrids between two populations of Chinese shrimp （Fennropenaeus chinensis）

The total yield of shrimp farming industry declined after WSSV broke out. It was only at the last 20 years that production had again begun to increase[1]. So far, shrimp farming industries mostly depend on capturing wild shrimps or wild post-larvae to sto…     

Identification of genes associated with cotyledon senescence in upland cotton

Leaf senescence in plants is an essential develop- mental phase, and an understanding of senescence is important not only for pure scientific reasons, but also for practical purposes. During the last decade, a number of senescence-associated genes (SAGs) …     

Comparative genome research between maize and rice using genomicin situ hybridization

Using the genomic DNAs of maize and rice as probes respectively, the homology of maize and rice genomes was assessed by genomic in situ hybridization. When rice genomic DNAs were hybridized to maize, all chromosomes displayed many multiple discrete regions, while each rice chromosome delineated a single consecutive chromosomal region after they were hybridized with maize genomic DNAs. The results indicate that the genomes of maize and rice share high homology, and confirm the proposal that maize and rice are diverged from a common ancestor.     

Expression and regulation of orphan receptor TR2 mRNA in germ cells of cryptorchid testis in rat and rhesus monkey

Expression and cellular localization of orphan receptor TR2 mRNA in relation to germ cell apoptosis in cryptorchid testes of rat and rhesus monkey have been studied by usingin situ hybridization andin situ 3′-end labeling of DNA fragments (TUNEL). The results show that: (i) TR2 mRNA is specifically expressed in the germ cells, mainly in the spermatocytes, round and elongated spermatids. The expression level of TR2 mRNA varies with the seminiferous cycle, (ii) In the rat cryptorchid testes on days 3 and 5 after the surgery, the germ cells began to undergo apoptosis with no evident decrease in TR2 mRNA level. On day 7.5, however, most germ cells underwent apoptosis, while the expression level of TR2 mRNA declined markedly, and TR2 mRNA was rarely expressed on day 10 thereafter, (iii) On days 15 and 20 of the cryptorchid testes of rhesus monkey, TR2 mRNA was only expressed in a few of primary spermatocytes and the mRNA was almost undetectable on days 30, 45, 60. These results suggest that TR2 mRNA probably plays an important role in spermatogenesis and germ cell apoptosis.     

基于FISH探针杂交设备的温度控制系统

以玻片为基础的FISH,它的变性杂交过程完全实现自动化.FISH探针杂交仪内置一个ARM7微处理器,以控制不同温度变化,满足变性、杂交和固定温度等不同模式,可预置用按键编程进去的程序(显示屏上能指导编程),方便客户调用,提高工作效率.温度控制系统是FISH探针杂交设备的核心部分,决定了杂交仪的可靠性、稳定性及精准性.     

A review on hybridization modification of graphene and its polymer nanocomposites

Recently,graphene has attracted numerous interests from both fundamental and applied fields due to its excellent mechanical,thermal,electrical conductivity and other novel properties.This review gives an overview of recent progress on hybridization modifications of graphene with carbon nanomaterials.Some example applications of graphene-based nanohybrids in polymer composites,optical and conducting materials,high performance electrolyte materials and as well as other functional materials are summarized and discussed.     

国兰优良品种杂交及种子无菌萌发研究

选取国兰传统优良品种春兰:黄梅(父本)×黄荷(母本)、建兰:君荷(父本)×市长红(母本)、蕙兰:315梅(父本)×庆华梅(母本)进行杂交,通过改良培养基配方,进行无菌播种繁殖,观察不同成熟度果荚的种子萌发和杂交后代生长情况。结果显示,授粉后150～180 d的杂交F_1代种子,播种后可获得理想的无菌萌发效果,种子萌发率达60%以上。试验成功获得生长健壮的杂交后代完整植株,为今后的新品种选育提供了育种材料。     

基于DNA探针和FISH技术对两种有害浮游植物的检测研究

针对两种典型的有害浮游植物微小原甲藻和Takayama pulchellum(T.pulchellum)各设计了4条特异性探针,并采用基于PCR管载体的荧光原位杂交检测方法检测了这些探针的标记效果。实验结果表明,针对微小原甲藻和T.pulchellum核糖体大、小亚基DNA(LSU和SSU rDNA)的序列信息所设计的8条荧光标记探针均能够特异性地识别这些目标藻。各探针的标记效果有一定差异,经过标记的目标藻细胞在单种和自然水样混合样品中均可以通过荧光显微镜进行识别和区分。针对微小原甲藻和T.pulchellum的荧光原位杂交检测方法的建立将有助于对样品中这些目标藻进行快速准确地检测和监测。     

浅谈畜禽杂交的几种方式

介绍了畜禽的几种杂交方式,并分析了各自的优缺点,指出需注意的一些问题。     

水稻种子萌发期间胚乳水解的电镜观察

本文对杂交水稻威优35,常规稻湘早籼1号,晚粳6647不同萌发时期的胚乳进行了电镜观察。结果表明:杂交水稻在萌发期间淀粉水解速度比常规稻快,表现出明显的生理优势。这一生理优势与杂交水稻幼苗的生长优势一致。