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Articles by Zhao Xingxu
Total Records ( 2 ) for Zhao Xingxu
  Hu Junjie , Zhang Yong , Wang Junying , Zhao Xingxu and Zhang Hairong
  It is well known that melatonin is a coordinating signal for mammalian reproduction. In order to confirm the presence of melatonin receptors in hypothalamus-pituitary-gonadal axis and pineal of female Bactrian camel, the researchers used a Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) procedure to examine receptor MT1 expression. The length of MT1 gene was 452 bp. RT-PCR assaying revealed the presence of the mt1 (Mel1a) melatonin receptor subtype in reproduction axis and pineal which were obtained from the slaughterhouse in the Ningxia Autonomous Region, China. Sequence has been confirmed a high identity (above 85%) with melatonin receptor MT1 of other mammal known in GenBank. Comparing with other tissue’s sequences, one base substitution changed the 108th TTC codon (encoding Phenylalanine) to TAC (Tyrosine) on hypothalamus. Although, there are base substitutions in pineal’s gene, encoded amino acid are coincident with pituitary and ovary. The current results, the expression of MT1 receptor mRNA in brain and ovary, suggest that melatonin regulate reproduction function through not only neuroendocrine but also directly acting on the ovary in Bactrian camel.
  Fan Jie , Zhang Yong and Zhao Xingxu
  A Streptococcus agalactiae GS was isolated from milk from mastitis cattle in Gansu region of China. Sequence and phylogenetic analysis of Sip gene segments revealed that the Streptococcus agalactiae GS was most similar to a recent group B streptococcus isolated in dairy cattle from China. The Sip gene were selected and amplified, it contained a 1305 bp Open Reading Frame (ORF) which encoded 434 amino acids. The molecular mass of the deduced amino acid sequences was 56 kD. Blast analysis showed that it shared high identities (91.0-99.0%) with Sip sequences of other GBS registered in GenBank while lower identities (<50%) was found compared with other species of Streptococcus. The deduced amino acid homology was 90.2-98.8%.
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