| the origin and genetic differentiation of native breeds of pigs in southwest china: an approach from mitochondrial dna polymorphism. | mitochondrial dna (mtdna) of six breeds of native domestic pigs from yunnan province, southwest china, and two wild boars obtained from sichuan, china, and vietnam was analyzed using 20 restriction endonucleases that recognize six nucleotides. restriction maps were made by double-digestion methods and polymorphic sites were located on the map. according to their mtdna restriction types, all the breeds were classified into six groups. genetic distances among groups were calculated to define their ... | 1993 | 8097084 |
| the epidemiology of human trichinellosis in china during 2000-2003. | the endemic foci of trichinellosis continue to be mainly located in the southwestern, the central and northeastern china. the seroepidemiological surveys of t. spiralis infection in humans were carried out in six provinces or municipals (p/m) of china during 2000-2003, the overall seroprevalence was 3.57%. from 2000 to 2003, 17 outbreaks of human trichinellosis, with 828 cases and 11 deaths, were recorded in 8 p/a of china. all of 11 deaths occurred in the southwestern china (1 case in sichuan, ... | 2006 | 16414006 |