刘承钊教授生前发表的两栖动物新种

本文介绍刘承钊教授生前本人或与合作者描述发表的两栖动物66个新种,分隶2目9科,计有尾目2科9种,无尾目7科57种(名单见附表)。其中,刘承钊和胡淑琴(1961)《中国无尾两栖类》将以下4种列为同物异名:108页:ＡｅｌｕｒｏｐｈｒｙｎｅｂｒｅｖｉｐｅｓＬｉｕ=胸腺猫眼蟾ＡｇｌａｎｄｕｌａｔｕｓＬｉｕ[后改属名,称为胸腺齿突蟾Ｓｃｕｔｉｇｅｒｇｌａｎｄｕｌａｔｕｓ(Ｌｉｕ)]。265页:胡氏树蛙ＲｈａｃｏｐｈｏｒｕｓｈｕｉＬｉｕ=杜氏树蛙ＲｈａｃｏｐｈｏｒｕｓｄｕｇｒｉｔｅｉＤａｖｉｄ[后改属名,称为杜氏泛树蛙Ｐｏｌｙｐｅｄａｔｅｓｄ…     

Nucleotide sequence analysis of the human salivary protein genes HIS1 and HIS2, and evolution of the STATH/HIS gene family

Human histatins are a family of low-M(r), neutral to very basic, histidine-rich salivary polypeptides. They probably function as part of the nonimmune host defense system in the oral cavity. A 39-kb region of DNA containing the HIS1 and HIS2 genes was isolated from two human genomic phage libraries as a series of overlapping clones. The nucleotide sequences of the HIS1 gene and part of the HIS2(1) gene were determined. The transcribed region of HIS1 spans 8.5 kb and contains six exons and five introns. The HIS1 and HIS2(1) genes exhibit 89% overall sequence identity, with exon sequences exhibiting 95% identity. The two loci probably arose by a gene duplication event approximately 15-30 Mya. The HIS1 sequence data were also compared with that of STATH. Human statherin is a low-M(r) acidic phosphoprotein that acts as an inhibitor of precipitation of calcium phosphate salts in the oral cavity. The HIS1 and STATH genes show nearly identical overall gene structures. The HIS1 and STATH loci exhibit 77%-81% sequence identity in intron DNA and 80%-88% sequence identity in noncoding exons but only 38%-43% sequence identity in the protein-coding regions of exons 4 and 5. These unusual data suggest that HIS1, HIS2, and STATH belong to a single gene family exhibiting accelerated evolution between the HIS and STATH coding sequences.