全文获取类型
收费全文 | 28845篇 |
免费 | 82篇 |
国内免费 | 158篇 |
专业分类
系统科学 | 139篇 |
丛书文集 | 499篇 |
教育与普及 | 42篇 |
理论与方法论 | 100篇 |
现状及发展 | 13451篇 |
研究方法 | 1279篇 |
综合类 | 13179篇 |
自然研究 | 396篇 |
出版年
2013年 | 269篇 |
2012年 | 411篇 |
2011年 | 809篇 |
2010年 | 168篇 |
2008年 | 524篇 |
2007年 | 576篇 |
2006年 | 578篇 |
2005年 | 536篇 |
2004年 | 538篇 |
2003年 | 498篇 |
2002年 | 500篇 |
2001年 | 936篇 |
2000年 | 865篇 |
1999年 | 616篇 |
1992年 | 595篇 |
1991年 | 414篇 |
1990年 | 486篇 |
1989年 | 494篇 |
1988年 | 460篇 |
1987年 | 546篇 |
1986年 | 474篇 |
1985年 | 596篇 |
1984年 | 484篇 |
1983年 | 364篇 |
1982年 | 340篇 |
1981年 | 367篇 |
1980年 | 462篇 |
1979年 | 889篇 |
1978年 | 757篇 |
1977年 | 740篇 |
1976年 | 611篇 |
1975年 | 632篇 |
1974年 | 845篇 |
1973年 | 756篇 |
1972年 | 779篇 |
1971年 | 840篇 |
1970年 | 1073篇 |
1969年 | 813篇 |
1968年 | 820篇 |
1967年 | 795篇 |
1966年 | 681篇 |
1965年 | 472篇 |
1964年 | 156篇 |
1959年 | 249篇 |
1958年 | 440篇 |
1957年 | 292篇 |
1956年 | 259篇 |
1955年 | 246篇 |
1954年 | 239篇 |
1948年 | 162篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
471.
Sergio Cházaro–Olvera Ignacio Winfield Mónica Abarca–Ávila Manuel Ortiz Miguel Lozano–Aburto 《Journal of Natural History》2018,52(17-18):1091-1113
The biodiversity, geographic distribution, and community parameters of the benthic tanaidaceans associated with three coral reefs along the SW and SE Gulf of Mexico were analysed. A total of 15,525 specimens were grouped in 36 species. The highest value of abundance was found in the PNSAV with 6382 tanaidaceans. The PNSAV presented 30 species, the ANPT-L 16 species, and the SABS 17 species. The species with the widest distribution were Pseudonototanais sp., Condrochelia dubia, Leptochelia forresti, Synapseudes sp., Haplopolemius propinquus, Alloleptochelia longimana, and Paradoxapseudes bermudeus. In the Veracruz System Reef, the highest abundance was recorded for Condrochelia dubia and Pseudonototanais sp. The highest value of diversity was obtained in the SABS (3.08 bits/ind in the reef Bajo Diez), and the lowest value was found in the PNSAV (0.07 bits/ind in the reef Isla de Enmedio). The highest value of abundance was found in coral rubble and macroalgae. A significant relationship between depth and specific richness was found in the three reef systems. Using cluster analysis, three groups were found in each system, mainly related to the proximity to the coast and to urban areas. This is one of the first studies to show the specific substrate and attributes of three communities of tanaidaceans along the SE–SW coast of the Gulf of Mexico. 相似文献
472.
M. J. Page 《Journal of Natural History》2018,52(17-18):1157-1180
Colonial ascidians collected from wharf piles and natural substrata from Bluff Harbour and Stewart Island in the South Island of New Zealand are described in this paper. Two species, Lissoclinum violaceum sp. nov. and Didemnum marineae sp. nov. are new to science and described for the first time. The ascidian fauna in this region is a mixed assemblage of southern species, species with a New Zealand-wide distribution, and two species with trans-Tasman affinities.
www.zoobank.org/urn:lsid:zoobank.org:pub:37DC0D4B-8FB9-4F1D-A5A0-E9CAB3203447 相似文献
473.
474.
475.
Francisco Diogo R. Sousa Lourdes M.A. Elmoor-Loureiro Sandro Santos 《Journal of Natural History》2016,50(43-44):2727-2768
Altogether, Coronatella and Hexalona-branches are considered the main lineages of Aloninae – a subfamily of common bottom-dwelling microcrustaceans in freshwater environments. Although the taxonomic features of Brazilian members of the Hexalona-branch have been summarised for species from the costata-group and affinis-group, a revision of other widely distributed species in the world is still lacking in this country. The aim of this paper was to study the morphology of Brazilian populations from the guttata-group and intermedia-group, and to describe a new genus from the Hexalona-branch. The parthenogenetic females of Alona cf. guttata from Brazil have similar morphology when compared to data from the literature, but the armature of the terminal claw of its males seems to be different from those of Alona guttata sensu stricto, Alona barbulata and Alona werestschagini. The intermedia-group is formed by Alona elisae sp. nov., which seems to be endemic to the Cerrado of Brazil Central, and Alona isabellae sp. nov., which is widely distributed in Brazil; this species has a labral keel armed with 2–4 setulae, and postabdomen with setulae of lateral fascicles longer than the level of marginal denticles, morphological traits that differentiate it from Alona elisae sp. nov. Another endemic species from the Hexalona-branch is Prenda arvensis gen. nov. and sp. nov., which has two main head pores, a reduced seta on endite 1 of the first limb, sixth limb is a wide lobe. The potential of biodiversity from the Hexalona-branch from Brazil is still underestimated, and a global revision of the guttata-group and intermedia-group is very important for the progress of Aloninae taxonomy and systematics.
http://zoobank.org/urn:lsid:zoobank.org:pub:0A2E4A30-0C9C-43E8-8E72-1DEDA6AFF3C3 相似文献
476.
Huet J Wyckmans J Wintjens R Boussard P Raussens V Vandenbussche G Ruysschaert JM Azarkan M Looze Y 《Cellular and molecular life sciences : CMLS》2006,63(24):3042-3054
Two chitinases, able to use tetra-N-acetylglucosamine, chitin and chitosan as substrates, were characterized after purification from Carica papaya latex. The complete amino acid sequence of the major form and about 40% of the minor one were determined through proteolytic
digestions and mass spectroscopy analysis. Sequencing demonstrated that both papaya chitinases are members of the family 19
of glycosyl hydrolases (GH19). Based on the known 3-D structures of other members of family GH19, it was expected that papaya
chitinases would adopt all-alpha structures. However, circular dichroism and infrared spectroscopy indicated, for the papaya
chitinases, a content of 15–20% of extended structures besides the expected 40% of alpha helices. Since the fully sequenced
papaya chitinase contains a large number of proline residues the possibility that papaya chitinase contains polyproline II
stretches was examined in the context of their resistance against proteolytic degradation.
Received 11 July 2006; received after revision 13 October 2006; accepted 25 October 2006 相似文献
477.
The use of anti-5-methylcytosine antibodies in affinity columns allowed the identification of methylated sequences in the
genome of Drosophila melanogaster adults. In view of the presence of transposable elements amongst the identified sequences, it has been suggested that DNA
methylation is involved in transposon control in the fly genome. On the contrary, a reanalysis of these data furnishes several
intriguing elements that could raise new questions about the role that DNA methylation plays in the fly genome. The aim of
the present paper is to discuss some features that emerge from the analysis of the identified methylated sequences.
Received 26 January 2006; received after revision 8 May 2006; accepted 2 June 2006 相似文献
478.
479.
Memories become stabilized through a time-dependent process that requires gene expression and is commonly known as consolidation. During this time, memories are labile and can be disrupted by a number of interfering events, including electroconvulsive shock, trauma and other learning or the transient effect of drugs such as protein synthesis inhibitors. Once consolidated, memories are insensitive to these disruptions. However, they can again become fragile if recalled or reactivated. Reactivation creates another time-dependent process, known as reconsolidation, during which the memory is restabilized. Here we discuss some of the questions currently debated in the field of memory consolidation and reconsolidation, the molecular and anatomical requirements for both processes and, finally, their functional relationship. 相似文献
480.
Betaine homocysteine S-methyltransferase: just a regulator of homocysteine metabolism? 总被引:1,自引:0,他引:1
Betaine homocysteine methyltransferase (BHMT), a Zn2+-dependent thiolmethyltransferase, contributes to the regulation of homocysteine levels, increases in which are considered
a risk factor for cardiovascular diseases. Most plasma homocysteine is generated through the liver methionine cycle, in which
BHMT metabolizes approximately 25% of this non-protein amino acid. This process allows recovery of one of the three methylation
equivalents used in phosphatidylcholine synthesis through transmethylation, a major homocysteine-producing pathway. Although
BHMT has been known for over 40 years, the difficulties encountered in its isolation precluded detailed studies until very
recently. Thus, the last 10 years, since the sequence became available, have yielded extensive structural and functional data.
Moreover, recent findings offer clues for potential new functions for BHMT. The purpose of this review is to provide an integrated
view of the knowledge available on BHMT, and to analyze its putative roles in other processes through interactions uncover
to date.
Received 26 May 2006; received after revision 3 July 2006; accepted 24 August 2006 相似文献