检索结果-南通市图书馆

A Possible Long-tailed Bird with a Pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2005年第1期79卷 7-10页

作者： L Junchang1 and HOU Lianhai2 1 Institute of Geology, Chinese Academy of Geological Sciences, beijing 100037 2 Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, beijing 100044 department of biology, capital normal university, beijing 100037 Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China Chinese Acad Sci Inst Vertebrate Paleontol & Paleoanthropol Beijing 100044 Peoples R China capital normal Univ Dept Biol Beijing 100037 Peoples R China

An incomplete caudal vertebral series (IVPP V11309) from the Yixian Formation of late Mesozoic, Jianshangou area of Beipiao, western Liaoning Province, may represent a new bird. The tail is composed of at least 12 free caudal vertebrae and the most distal 5 caudal vertebrae co-ossified into a pygostyle. The pygostyle is plate-like and slightly curved dorsally. The anterior free caudals are amphiplatyan. The anterior caudal surfaces of the last three free caudals are concave, but their posterior articular surfaces are convex. The pygostyle is regarded as the first appeared flight apparatus during the evolutionary process from Archaeopteryx to neornithes. The pygostyle appeared in most early fossil birds and almost all the modern birds. Although their morphologies are different, they are basically formed by at least four last caudal vertebrae. The specimen V11309 is regarded as a bird rather than a non-avian theropod dinosaur based on the following characters: short caudal vertebrae, numerous pits present on the surfaces of the centra and, a foramen present between the basal part of the fused neural spines, which is similar to that of Struthio camelus. The discoveries of pygostyles from the therizinosauroids and oviraptorosaurs may provide strong evidence for supporting the origin of birds from small theropod dinosaurs. The structure of the pygostyle in specimen V11309 is different from those of Beipiaosaurus (Therizinosauroid) and Nomingia (oviraptorosaur). The most parsimonious interpretation is that these pygostyle-like structures are independently acquired by Beipiaosaurus and Nomingia during their evolutionary process.

关键词： western Liaoning Yixian Formation late Mesozoic pygostyle

DDRT-PCR Analysis of Wheat Roots Under Iron-Deficient Condition and Differential Expression of ABC Gene

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2002年第12期1卷 1317-1320页

作者： YIN Li-ping, LIU Wei-zhong, LIU Xiang-lin, HUANG Qin-ni and ZHANG Fu-suo(department of biology , capital normal university , beijing 100037 , P. R. China China Agricultural university , beijing 100094 , P. R. China) department of biology Capital Normal University Beijing 100037 P.R.China China Agricultural university Beijing 100094 P.R.China

Differential expression of gene in iron-efficient wheat cultivar Jing411 and iron-inefficient cul-tivar SanshumaiS under iron-deficiency and iron-sufficiency conditions was revealed by differential display reverse transcript PCR (DDRT-PCR) method. Northern blotting was carried out using ATP-binding transporter (ABC) cDNA obtained from DDRT-PCR products of the cultivar Jing411 as probe. Our results suggested that ABC gene expression was suppressed under iron-deficiency condition.

关键词： Wheat Roots Iron nutrition DDRT-PCR Gene expression

Cloning and functional analysis of chloroplast division gene NtFtsZ2-l in Nicotiana tabacum

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2003年第5期 39-43页

作者： KONG Dongdong , JU Chuanli, WANG Dong, HU Yong, ZHU Zhiqing, HE Yikun and SUN Jingsan (1. Key Laboratory of Photosynthesis and Enviromental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, beijing 100093, China 2. department of biology, capital normal university, beijing 100037, China 3. Laboratory of Agronomy and Biotechnology, China Agricultural university, beijing 100037, China 4. College of Life Sciences, beijing normal university, beijing 100875, China)

FtsZ protein plays an important role in the division of chloroplasts. With the finding and functional analysis of higher plant FtsZ proteins, people have deepened the understanding in the molecular mechanism of chloroplast division. Multiple ftsZ genes are diversified into two families in higher plants, ftsZ1 and ftsZ2 . On the basis of the research on ftsZl family, we analyzed the function of NtFtsZ2-l gene in Nicotiana tabacum . Microscopic analysis of the sense and antisense NtFtsZ2-l transgenic tobacco plants revealed that the chloroplasts were abnormal in size and also in number when compared with wild-type tobacco chloroplasts. Our investigations confirmed that the NtFtsZ2-l gene is involved in plant chloroplast division.

关键词： Nicotiana tabacum NtFtsZ2-l gene chloroplast division.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

植物维生素E合成及其生物技术改良

中国生物工程杂志 2004年第1期24卷 32-35页

作者：胡英考首都师范大学生物系北京100037

维生素E是一种抗氧化剂 ,对植物、动物和人类自身都具有十分重要的作用 ,而植物则是人类维生素E的主要来源 ,因此克隆植物中维生素E合成的相关酶基因 ,对维生素E含量进行改良 ,具有重要意义。对植物中维生素E的合成途径。

关键词：植物维生素E 基因克隆基因工程分子标记

衣藻叶绿体分裂相关基因CrFtsZ3的克隆及其原核表达

在线全文

学校读者我要写书评

暂无评论

生物化学与生物物理学报 2003年第11期35卷 998-1004页

作者：胡勇孔冬冬王东何奕昆首都师范大学生物系中国科学院植物研究所北京师范大学生命科学学院首都师范大学生物系北京100037 北京100093 北京100875

FtsZ蛋白在原核细胞以及植物细胞叶绿体的分裂过程中发挥着重要作用。为了研究叶绿体分裂装置的进化 ,运用RT PCR方法从莱茵衣藻中克隆了叶绿体分裂相关基因CrFtsZ3。由于已经从衣藻细胞中克隆了一个ftsZ基因 ,所以CrFtsZ3的克隆表明衣... 详细信息

FtsZ蛋白在原核细胞以及植物细胞叶绿体的分裂过程中发挥着重要作用。为了研究叶绿体分裂装置的进化 ,运用RT PCR方法从莱茵衣藻中克隆了叶绿体分裂相关基因CrFtsZ3。由于已经从衣藻细胞中克隆了一个ftsZ基因 ,所以CrFtsZ3的克隆表明衣藻中已经存在两类不同的 ftsZ基因 ,这说明 ftsZ基因的复制与分歧发生于绿藻的分化之前。序列分析结果显示 ,CrFtsZ3所编码的蛋白质具有FtsZ蛋白的典型模体。进一步的原核表达与定位分析表明CrFtsZ3 GFP融合蛋白沿着宿主菌体的纵轴方向有规律地聚集成荧光点或荧光带 ,并且CrFtsZ3蛋白过量表达明显干挠了宿主菌正常的细胞分裂过程 ,说明衣藻CrFtsZ3蛋白能够识别宿主细胞内的分裂位点并影响细胞分裂过程 ,从而初步验证了它的生物学功能

关键词：莱茵衣藻 RT-PCR CrFtsZ3基因系统发生树融合表达

Cloning of two plastid division ftsZ genes from Nicotiana tabacum and their expression in E. coli

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2002年第12期 31-36页

作者： WANG Dong KONG Dongdong HU Yong JU Chuanli HE Yikun and SUN Jingsan(1. department of biology, capital normal university, beijing 100037, China 2. Institute of Botany, Chinese Academy of Sciences, beijing 100093, China 3. College of Life Sciences, beijing normal university, beijing 100875, China) department of biology，capital normal university，beijing 100037，China College of Life Sciences，beijing normal university，beijing 100875，China department of biology，capital normal university，beijing 100037，China Institute of Botany，Chinese Academy of Sciences，beijing 100093，China department of biology，capital normal university，beijing 100037，China Institute of Botany，Chinese Academy of Sciences，beijing 100093，China

Two cDNAs of plastid division gene NtFtsZ1-1 and NtFtsZl-2 are isolated from Nicotiana tabacum by RT-PCR and rapid amplification cDNA ends (RACE) method. Analysis of the deduced amino acid sequences encoded by NtFtsZl-1 and NtFtsZl -2 indicate that these two proteins possess the typical conservative motifs and GTP binding sites existing in all FtsZ proteins. The existence of putative plastid transit peptide in their N-terminal suggests that there are at least two transit-peptide containing FtsZ proteins in higher plants. Phylogenetic analysis based on amino acid sequences of FtsZ proteins also supports this interference. These two NtFtsZ genes demonstrate a similar expression pattern during the plant development detected by Northern blot. Expression of NtFtsZl-1 and NtFtsZl-2 in E. coli interrupts the normal division process of host cells. These results suggest the diverse functions of FtsZ proteins in higher plants.

关键词： NtFtsZ genes plastld division Nicotiana tabacum plastid transit peptide expression in E.coli.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

羊肚菌属分子系统学研究进展

微生物学通报 2004年第6期31卷 115-119页

作者：胡克兴董雪范黎首都师范大学生物系北京100037

简要介绍羊肚菌属系统学研究现状。

关键词：羊肚菌属分子系统学进展

Cloning of plastid division gene GlFtsZ from Gentiana lutea and its expression during petal development

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2002年第8期 34-39+84页

作者： HE Yikun , ZHU Changfu , WANG Dong, KONG Dongdong and SUN Jingsan(1. Institute of Botany, Chinese Academy of Sciences, beijing 100093, China 2. department of biology, capital normal university, beijing 100037, China 3. College of Life Science, Northeast normal university, Changchun 130024, China) Institute of Botany，Chinese Academy of Sciences，beijing 100093，China department of biology，capital normal university，beijing 100037，China College of Life Science，Northeast normal university，Changchun 130024，China Institute of Botany，Chinese Academy of Sciences，beijing 100093，China

A full-length cDNA of GlFtsZ was isolated by screening the cDNA library of Gentiana lutea. Analysis of the deduced amino acid sequence encoded by GIFtsZ indicated that GIFtsZ protein possesses the typical conservative motifs existed in all FtsZ proteins. The existence of putative plastid transit peptide in its N-terminus suggested that GIFtsZ might function inside of plastids. With the developmental process of petals of Gentiana lutea, the expression of plastid division gene GIFtsZ declined gradually, whereas the expression of carotenoids biosynthesis gene Zds increased obviously; meanwhile, in contrast to the increment of carotenoids, the content of chlorophyll in petals decreased sharply. The chloroplasts turned into chromoplasts, and the color of petals also turned from green to golden. All of these results suggested that the expression of GIFtsZ is accompanied with the development and differentiation of plastids.

关键词： FtsZ gene plastids chromoplasts Gentiana lutea .

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

端粒、端粒酶的研究与人类肿瘤

首都师范大学学报（自然科学版） 2002年第1期23卷 60-63页

作者：刘明首都师范大学生物系北京100037

近年来 ,有关端粒、端粒酶及其与人类肿瘤关系问题已经成为学科研究较为关注的热点 ,认为人类端粒酶与恶性肿瘤的发生和人的衰老之间具有非常密切的关系 ,研究已取得了长足的进展 .本文介绍了一些研究成果、进展情况 ,探讨端粒、端粒酶... 详细信息

近年来 ,有关端粒、端粒酶及其与人类肿瘤关系问题已经成为学科研究较为关注的热点 ,认为人类端粒酶与恶性肿瘤的发生和人的衰老之间具有非常密切的关系 ,研究已取得了长足的进展 .本文介绍了一些研究成果、进展情况 ,探讨端粒、端粒酶活性同肿瘤诊断之间的关系 .

关键词：端粒假说端粒酶肿瘤发生学衰老末端复制问题肿瘤诊断酶活性调控