A revision of the <Emphasis Type="Italic">Heterospathe elegans</Emphasis> (<Emphasis Type="Italic">Arecaceae</Emphasis>) complex in New Guinea

Summary  Three closely affiliated species of Heterospathe Scheff. (H. elegans (Becc.) Becc., H. humilis Becc. and H. versteegiana Becc.) from New Guinea are revised. They are reduced to a single species which is divided into two subspecies, and the new combination H. elegans subsp. humilis (Becc.) M. S. Trudgen & W. J. Baker is made. The subspecies can be readily distinguished by their growth habit. Epitypes are designated for the three previously published names, as informative material on the habit is not included in the existing type specimens. A new, potentially related species is described as H. pullenii M. S. Trudgen & W. J. Baker.     

西藏墨脱地区6种鸟类种和亚种的新分布记录

2018年10月至2021年10月,在西藏墨脱县开展鸟类多样性调查期间记录到6种鸟类新分布,分别是大蓝仙鹟 (Cyornis magnirostris)、黄嘴角鸮 (Otus spilocephalus)、金胸雀鹛指名亚种 (Lioparus chrysotis chrysotis)、细嘴钩嘴鹛Sintextus亚种 (Pomatorhinus superciliaris intextus)、白喉姬鹟指名亚种 (Anthipes monileger monileger)、棕胸雅鹛assamense亚种 (Trichastoma tickelli assamense)。     

甘肃肉羊新品种选育群GDF9基因外显子2多态性及其与产羔性状关联分析

根据GenBank发布的绵羊GDF9基因外显子2的序列设计4对引物,采用PCR-SSCP技术分析GDF9基因外显子2在甘肃内羊新品种选育群羊中的单核苷酸多态性,并与产羔性状进行关联分析.结果表明,GDF9基因的扩增片段在所检测的新品种群羊中存在PCR-SSCP多态性,检测到3种基因型(AA、AB和BB),而在32只无角陶赛特母羊群中只检测到AA和AB基因型.测序结果显示,GDF9基因编码区第978位碱基发生A→G突变,但没有导致氨基酸的改变;第994位碱基发生G→A突变,导致Ⅴ变成Ⅰ(缬氨酸→异亮氨酸).新品种选育群羊产羔数的最小二乘均值关系为AB＞ AA＞ BB,统计分析结果初步表明3种基因型之间差异不显著(P＞0.05).故该区域可能不是影响新品种群羊繁殖力的功能结构区城.     

雄尾螨属二新种及马氏雄尾螨重新记述：（蜱螨亚纲：雄尾螨科）

作者在整理采自贵阳、长沙、武汉的马氏雄尾螨Arrenurus(Micruracarus)madarasziDaday标本中,发现了两个近似新种:拟马氏雄尾螨Arrenurus(Micruracarus)madarasziatus sp.nov.和华中雄尾螨Arrenurus(Micruracarus)huazhongensis sp.nov.本文记述了此三近以种,并作了特征鉴别。     

微小RNA-122对丙型肝炎病毒复制及感染治疗影响的研究进展

丙型肝炎病毒(HCV)感染后易演变为慢性肝炎,甚至进展为肝硬化、肝癌。目前尚无有效的预防疫苗,抗病毒药物的疗效也较局限。因此,直接靶向抗病毒且无毒副作用的治疗方法是目前研究的重点。微小RNA(miRNA)是一类小分子非编码RNA,主要通过下调宿主基因表达而发挥生物学功能。miRNA-122(miR-122)在HCV感染中的作用受到关注,探讨其影响HCV复制的具体分子机制对将其作为抗病毒治疗的一个靶目标、研发新型靶向抗HCV治疗药物有重要意义。本文主要就miR-122对HCV复制的影响及其成为潜在治疗靶点的研究现状作一综述。     

浩伦螨属3新种记述和1已知种雄螨及后若螨新发现（蜱螨亚纲：中气门目：派盾螨科）

记述浩伦螨属3新种和1已知种雄螨及后若螨：胸斑浩伦螨Holaspulus sternomaculatus sp.nov.,赣江浩伦螨Holaspulus ganjiangensis sp.nov.,拟网浩伦螨Holaspulus imitoreticulatus sp.aov.和福建浩伦螨Holaspulus fujianensis Ma et Lin,2006.     

新疆棘豆属一新种

假长毛棘豆　新种　图 1ＯｘｙｔｒｏｐｉｓｐｓｅｕｄｏｈｉｒｓｕｔａＱ .ＷａｎｇｅｔＣ .Ｙ .Ｙａｎｇ ,ｓｐ .ｎｏｖ .Ｆｉｇ.1ＳｐｅｃｉｅｓｎｏｖａａｆｆｉｎｉｓＯ .ａｓｓｉｅｎｓｉＶａｓｓ.,ｓｅｄｃｏｒｏｌｌａａｕｒｅａ,ｖｅｘｉｌｌｏ 1 7～ 2 0ｍｍｌｏｎｇｏ ,ｒｏｓｔｒｏｃａｒｉｎａｅ 2～ 2 .5ｍｍｌｏｎｇｏｄｉｆｆｅｒｔ.Ｐｅｒｅｎｎｉｓ,5～ 1 2ｃｍａｌｔａ ,ｂａｓｉｓｔｉｐｕｌｉｓｅｔｐｅｔｉｏｌｉｓｐｅｒｓｉｓｔｅｎｔｉｂｕｓｄｅｎｓｅｖｅｓｔｉｔａ,ｓｕｂａｃａｕｌｉｓ.Ｆｏ ｌｉａ 3～ 8ｃｍ…     

高糖高脂饮食对兔肾小管间质纤维化的影响

为研究高糖高脂饮食对新西兰兔(Oryctolagus cuniculus)肾小管间质纤维化的影响,将20只雄兔随机均分2组,分别喂正常饲料(对照组)和高糖高脂饲料(模型组),每月测空腹血糖和甘油三酯(TG),5个月后取尿液测尿糖、微量白蛋白(mAlb)和N-乙酰β-氨基葡萄糖苷酶(NAG),H.E、VG染色观察肾髓质病理改变,计算肾小管间质纤维化指数(TIFI)和胶原纤维面积,免疫组化测Ⅳ型胶原、纤维连接蛋白(FN)和转化生长因子β1(TGF-β1)的蛋白表达。结果显示,与对照组相比,模型组血糖、TG、尿糖、mAlb和NAG上升(P0.05或P0.01);肾小管间质肿胀,炎症细胞浸润,胶原纤维面积增加(22.47%±5.66%vs.9.43%±3.03%,P0.01),TIFI升高(2.369±0.6734vs.0.6810±0.2248,P0.01);Ⅳ型胶原、FN和TGF-β1的表达显著增加(P0.01)。上述结果说明,高糖高脂喂养兔5个月可导致肾小管、间质的结构和功能发生改变,细胞外基质表达增加,促进纤维化形成。     

中国蜘蛛抱蛋属植物的分类和植物地理的研究

蜘蛛抱蛋属植物主要产于亚洲东部,中国的广西是其现代的分布中心和分化中心。通过对从其 分类和植物地理方面的研究和修订,确认此属中国产有47种,其中45种为中国所特有,4个种为新种。文中列有中国产全部种的分种检索表和全部标本引证。     

New mutations in cloned Escherichia coli umuDC genes: novel phenotypes of strains carrying a umuC125 plasmid

The umuDC locus of Escherichia coli is required for most mutagenesis by UV and many chemicals. Mutations in E. coli umuDC genes cloned on pBR322-derived plasmids wer e isolated by two methods. First, spontaneously-arising mutant umuDC plasmids that failed to confe cold-sensitive growth on a lexA51(Def) strain were isolated by selection. Second, mutant umuDC plasmids that affected apparent mutant yield after UV-irradiation in a strain carrying umuD⁺C⁺ in the chromosome were isolated by screening hydroxylamine-mutagenized umuD⁺C⁺ plasmids. pBR322-derived umuD⁺C⁺ plasmids inhibited the induction of the SOS response of lexA⁺ strains as measured by expression of din::Mu dl(lac) Ap) fusionsbut most mutant plasmids did not. Mutant plasmids defective in complementation of chromosomal umuD44, umuC36, or both were found among those selected for failure to confer cold-sensitivity, whereas those identified by the screening procedure yielded mostly mutant plasmids with more complex phenotypes. We studied in greater detail a plasmid pLM109, carrying the umuC125 mutation. This plasmid increased the sensitivity of lexA⁺ strainsto killing by UV-irradiation but was able to complement the deficiencies of umuC mutants in UV mutagenesis. pLM109 failed to confer cold-sensitive growth on lexA(Def) strains but inhibited SOS induction in lexA⁺ strains. The effect of pLM109 on the UV sensitivity of lexA(Def)strains was similar to that of the parental umuD⁺C⁺ plasmid. The mutation responsible for the phenotypes of pLM109 was localized to a 615-bp fragment. DNA sequencing revealed that the umuC125 mutation was a G:C → A:T transition that changed codon 39 of umuC from GCC → GTC thus changing Ala39 to Val39. The implications of the umuC125 mutation for umuDC-dependent effects on UV-mutagenesis and cell survival after UV damage are discussed.