The operation used in the study , adjustable gastric banding , is performed through small slits and loops a band around the top of the stomach to cinch it into a small pouch so that people eat less and yet feel full 这次研究中的术式，是采取的调整性胃部束带手术，通过小的切口使用环状物将一个束带在胃底部固定并将胃的容积缩小，这样即使吃的东西比原来少了，患者仍然会产生饱胀感。
The results show that ( 1 ) loops are in general more variable than stems , and in loops a strong adenine bias are observed : ( 2 ) there does not exist a saturation effect in stems , loops or all positions of the 16s rrna gene fragments : ( 3 ) in the molecular cladogram , bagarius forms a sister group with glyptothorax , and euchiloganis forms a sister group with pareuchiloglanis , and exostoma forms a sister group with glyptosternum : ( 4 ) the phlogenetic positions of pseudecheneis , exostoma and glyptosternum are not recognized ; the glyptosternoid fishes are not monophyly although they are defined by 13 osteological apomorphies ; the incongruence of cladograms between molecular and morphological sets may be caused by less informative sites of the 550 homologous sites ; ( 5 ) e . davidi and e . kishinouyei could be the same species according to the genetic distances ; p . sinensis and p . anteanalis could be too 结果表明： ( 1 )环区平均变异位点较茎区多，有很强的a偏好性； ( 2 )没有替代饱和现象； ( 3 )分子系统树上?属和纹胸?属构成姐妹群，石爬?属和?属构成姐妹群， ?属和原?属构成姐妹群； ( 4 ) ?属、原?属和褶?属的系统发育位置不定， ? ?鱼类并未形成一个单系类群；可能的原因是所得到的16srrna基因片段信息位点太少； ( 5 )青石爬?和黄石爬?可能是同一物种，中华?和前臀?可能是同一物种。
