一次PCR扩增单纯疱疹和巨细胞病毒基因的检测方法

宫内感染是影响优生优育质量的一个重要因素,由病毒引起的宫内感染主要有以下四类病原：ＨＳＶ、ＣＭＶ、ＴＯＸＯ和风疹病毒（ＲＶ）,其中ＨＳＶ和ＣＭＶ的感染率较高。孕期这两种病原的感染会影响胎儿的正常发育,严重的可导致流产甚至胎儿畸形。目前已有针对这两种病...     

Transcriptome Analysis Reveals Candidate Genes Involved in Anthocyanin Biosynthesis in Flowers of the Pagoda Tree (Sophora japonica L.)

Journal of Plant Growth Regulation - The flowers of pagoda tree (Sophora japonica L.) are white, which limited its ornamental value and caused few researches on its flower color and anthocyanin...     

To curve for survival: Apical hook development

Apical hook is a simple curved structure formed at the upper part of hypocotyls when dicot seeds germinate in darkness.The hook structure is transient but essential for seedlings’ survival during soil emergence due to its efficient protection of the delicate shoot apex from mechanical injury.As a superb model system for studying plant differential growth,apical hook has fascinated botanists as early as the Darwin age,and significant advances have been achieved at both the morphological and molec...     

Optimization of novel monobactams with activity against carbapenem-resistant Enterobacteriaceae – Identification of LYS228

Metallo-β-lactamases (MBLs), such as New Delhi metallo-β-lactamase (NDM-1) have spread world-wide and present a serious threat. Expression of MBLs confers resistance in Gram-negative bacteria to all classes of β-lactam antibiotics, with the exception of monobactams, which are intrinsically stable to MBLs. However, existing first generation monobactam drugs like aztreonam have limited clinical utility against MBL-expressing strains because they are impacted by serine β-lactamases (SBLs), which are often co-expressed in clinical isolates. Here, we optimized novel monobactams for stability against SBLs, which led to the identification of LYS228 (compound 31). LYS228 is potent in the presence of all classes of β-lactamases and shows potent activity against carbapenem-resistant isolates of Enterobacteriaceae (CRE).     

Cytological evidence of biparental inheritance of plastids and mitochondria inPelargonium

Summary Based on the organelle differences between egg and sperm cells inPelargonium hortorum, the zygote, proembryo, and endosperm were examined under the transmission electron microscope. Plastids and mitochondria in the egg cell are significantly different from those of the sperm cell. Egg plastids are starch-containing and less electron dense. They appear circular, elliptical irregular elongate in sections. Sperm cell plastids are relatively electrondense, mostly cup-shaped or dumbbell and devoid of starch granules. Mitochondria of the egg cell are giant and mostly cup-shaped while sperm mitochondria are smaller and usually circular in section. Double fertilization is completed by 24 h after pollination and the pollen tube can be seen in the degenerated synergid. In the zygote, plastids and mitochondria from male and female gametes can be distinguished by their characteristic differences. Moreover, paternal and maternal organelles appear to be distributed at random in the zygote. Aside from the pollen tube and its released starch granules, there is no enucleated cytoplasmic body in the degenerated synergid. Two days after pollination, the zygote undergoes one transverse division to form a 2-celled proembryo which consists of one larger vacuolated basal cell and one smaller densely cytoplasmic apical cell. Paternal and maternal organelles can be detected in both cells of the proembryo and also in the endosperm at this stage. From these results, it can be concluded that plastids and mitochondria from both male and female gametes have been transmitted into the apical cell of the proembryo and most probably to the following generation.Abbreviations TEM transmission electron microscope - DAPI 4,6-diamidino-2-phenylindole - RFLP restriction fragment length polymorphism