The complete mitochondrial genomes sequences of Asio flammeus and Asio otus and comparative analysis

Mitochondrial DNA (mtDNA), as a model sys-tem, has been extensively used for molecular phy-logenetic and evolutionary analysis[1]. With the ad-vances in DNA sequencing technology, more andmore researchers prefer to use complete mitochondrialgenome for phylogenetic analysis[2—4]. Since the com-plete sequencing of human mtDNA in 1981 (Andersonet al., 1981)[5], 342 vertebrate mitochondrial genomeshave so far been sequenced. Up to now the completesequences of 29 avian mitochondrial genomes h…     

《生物多样性》2000年度优秀论文奖

经我刊2/3以上编委投票,并经编委会讨论评选出2000年度优秀论文奖,公布如下： 　　黄宏文,龚俊杰,王圣梅,何子灿,张忠慧,李建强.猕猴桃属(Actinidia)植物的遗传多样性.2000,8(1)1～12 　　东秀珠,沈德龙,辛玉华.16S rDNA同源性所揭示的双歧杆菌与有关细菌的亲缘关系.2000,8（2）146～152 　　王剑伟,王伟,崔迎松.野生和近交稀有鮈鲫的遗传多样性.2000,8（3）241～247 　　本刊将对以上作者颁发荣誉证书、赠送2001年全年刊物并给予一定的物质奖励。 《生物多样性》编辑部     

康乃馨红色素的提取研究

研究了用树脂吸附和分离康乃馨红色素 ,比较了 4种树脂对康乃馨红色素的吸附。结果表明 ,四种树脂对康乃馨红色素的吸附效果均较好。本实验选用AB 8树脂作吸附剂。洗脱剂用 6 0 %的乙醇 ,洗脱效果好 ,产品杂质少 ,色价高 ,且使用 2 0次后其吸附性能稳定 ,所以选用AB 8树脂吸附康乃馨红色素     

A NEW LOPHIALETID PERISSODACTYL(MAMMALIA) FROM THE EARLY EOCENE OF WUTU BASIN,SHANDONG PROVINCE

Periss0dactyla0wen,laseTaPiroideaGill,lgy2?tophiaiedaeMathedthenger,1925(Radhay,l%5)Ampeqhu!~gco'etsp'nov'TypeAfragInentaryrightmaxillawithcomPleteP2-MlandanteriorpartofM2twvlo7o2)'~andhothenCountyMine,2kmeastofWutUVillageofChangleCounty,Shandong;Eariyhee,WutUFonnahon'Inagn0dsApdrihveandmedium-edtapiroid'UPpercheekdrilow-crownedandmoderatey1ophodont,withdishnCtcuSPs;MlAnconeequalt0paraconeinfor;parastylerelativefysmall,anddosetoparacone;labialandlingUalcusPsinclinedt0ndd-dleakisof…     

The effects of azadirachtin on the testes of the desert locust,Schistocerca gregaria (Forskål)

Testes removed from Schistocerca gregaria, injected with 5 or 7&mgr;g azadirachting(-1) body wt on day 0-2 of the Vth instar and killed by decapitation 20days after treatment, showed significant reductions between the widths, lengths and volumes of the treated groups, compared to control insects. Under cytological examination these testes, from insects exhibiting classical signs of azadirachtin poisoning, showed arrested spermatogenic meiosis at Metaphase I.     

Persistence and Periodic Solutions of a System of Two Competing Species with Functional Response

1IntroductionOneofthemOStnit~tingquestionsinrnathernaticalbiologyconcernsthesurvivalofspeCiesinecologiCalmodels.Perslstenceisanimportantconceptindabingwiththeseproblems.Therearemanyliteraturesaboutthedy'ndricsofdiffuSivecompetingspeCies,butthefunctionalresPOnseofthisfOITnhasnotbeenst'Udiedtoomuchyet.Inthispaper,weconsiderthepersistenceproblemforanonautonomoussystemoftwOcompetingspecieswithfunctionalreSPOnse,themodelweconsiderinthispaperishereallri(t),ail(t),D,(t)anda(t)areassumedtobecon…