全文获取类型
收费全文 | 25133篇 |
免费 | 59篇 |
国内免费 | 72篇 |
专业分类
系统科学 | 107篇 |
丛书文集 | 295篇 |
教育与普及 | 65篇 |
理论与方法论 | 104篇 |
现状及发展 | 10270篇 |
研究方法 | 1061篇 |
综合类 | 12935篇 |
自然研究 | 427篇 |
出版年
2013年 | 232篇 |
2012年 | 351篇 |
2011年 | 779篇 |
2010年 | 154篇 |
2008年 | 401篇 |
2007年 | 486篇 |
2006年 | 477篇 |
2005年 | 480篇 |
2004年 | 448篇 |
2003年 | 433篇 |
2002年 | 444篇 |
2001年 | 881篇 |
2000年 | 860篇 |
1999年 | 494篇 |
1992年 | 466篇 |
1991年 | 376篇 |
1990年 | 404篇 |
1989年 | 435篇 |
1988年 | 403篇 |
1987年 | 383篇 |
1986年 | 419篇 |
1985年 | 493篇 |
1984年 | 373篇 |
1983年 | 349篇 |
1982年 | 277篇 |
1981年 | 280篇 |
1980年 | 335篇 |
1979年 | 818篇 |
1978年 | 628篇 |
1977年 | 613篇 |
1976年 | 482篇 |
1975年 | 525篇 |
1974年 | 776篇 |
1973年 | 614篇 |
1972年 | 647篇 |
1971年 | 763篇 |
1970年 | 961篇 |
1969年 | 732篇 |
1968年 | 764篇 |
1967年 | 669篇 |
1966年 | 649篇 |
1965年 | 452篇 |
1964年 | 110篇 |
1959年 | 245篇 |
1958年 | 411篇 |
1957年 | 310篇 |
1956年 | 257篇 |
1955年 | 234篇 |
1954年 | 229篇 |
1948年 | 186篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
221.
The spontaneous locomotor activity of the laboratory mouse is significantly depressed by the ingestion of deuterium oxide. The response, which is reversible, is a retilinear one with up to 70% reduction in activity with the administration of 25% heavy water. 相似文献
222.
G. M. Hanozet M. Simonetta D. Barisio A. Guerritore 《Cellular and molecular life sciences : CMLS》1976,32(10):1246-1249
Summary The three enzymes of ethanol metabolism alcohol dehydrogenase, aldehyde dehydrogenase and acetyl-CoA synthetase in the obligate aerobic yeastRhodotorula gracilis are repressed by glucose and induced by C2 metabolic fuels with a regulatory pattern indicating a correlation in the control mechanisms. To try an identification of the molecular signals involved in the transmission of the inducing stimulus, experiments were carried out by blocking with 2 mM pyrazole the ethanol acetaldehyde metabolic step. Results indicate that ethanol is not specifically required as a molecular signal for induction.This work was supported by a grant from the Italian Consiglio Nazionale delle Ricerche. 相似文献
223.
Summary Ring fission ofp, p-DDT was studied in the rat following a single oral dose of 0.74 mg/kg (1.04 Ci) of uniformly ring-labeled14C-DDT. Expired air was passed through a solution of ethanolamine-ethylene glycol monomethyl ether (12) to trap14CO2. A total of 1.6% of the radioactivity administered was recovered in the expired air collected continually for 10 days, indicating that while degradation of the phenyl moiety is not a major route pfp, p-DDT metabolism in the rat, it is equal to the urinary excretion. Nevertheless, these results represent the most radical change accomplished in vivo of a residual insecticide yet reported in mammals.Acknowledgment. We acknowledge the secretarial work of Ms.Elaine Smolko. This study was supported by NIH fellowship No. 1 F22 ES01723-01 and No. HL16264. 相似文献
224.
A. J. Rein D. D. Saperstein S. H. Pines P. C. Radlick 《Cellular and molecular life sciences : CMLS》1976,32(10):1352-1354
Summary Using Raman spectroscopy, we demonstrate that low levels of -carotene, lycopene, and xanthophyll give rise to resonance enhanced bands in blood plasma. These results explain the significance of previously unidentified spectral maxima which have been related to the state of health of the blood donor. 相似文献
225.
Summary The effect of negative and positive air ionisation on siliconized blood serotonin was studied in vitro. The experiments showed that within 10 min positive ionisation increased serotonin levels in total blood (+40%), plasma (+90%), erythrocytes (+50%) and thrombocytes (+200%). On the other hand, negative ionization (10 min) lowered the serotonin content of total blood (–30%), plasma (–42.5%), erythrocytes (–41.7%) and thrombocytes (–72.3%), thus confirming the Krueger Effect in vitro.This research was generously supported by a grant from the Joint Research Fund of the Hebrew University and Hadassah, and Dr. and Mrs.Leonard Appleby of Palmbeach, Florida.Acknowledgment: Our thanks are due to Mr.B. Shalita, Mrs.Zippora Adar and Mrs.Olga Fradkin for devoted technical assistance. 相似文献
226.
RNA synthesis in α-amanitin-poisoned rats: Prevention of recovery by inhibition of protein synthesis
Summary The treatment with cycloheximide of rats previously poisoned with -amanitin hinders the recovery of RNA synthesis observed in the liver of rats treated with -amanitin alone. The recovery of RNA synthesis can be ascribed to the capability of poisoned rats to synthesize new RNA-polymerase II.Acknowledgments: We thank ProfessorT. Wieland for the generous gift of -amanitin. This work was supported by grants from C.N.R., Rome, and by Pallotti's legacy for Cancer Research. 相似文献
227.
γ-Al2O3载体孔内原位合成水滑石 总被引:6,自引:0,他引:6
以尿素为沉淀剂,利用γ-Al2O3的内孔表面铝源原位合成水滑石. 考察了晶化时间、晶化温度、初始溶液浓度、原料配比对原位合成水滑石的影响. 实验中发现晶化6 h,MgAlCO3-LDH的晶体结构已趋于完整,晶化时间大于6 h时会有NH4Al(OH)2CO3*H2O杂相生成.在实验条件范围内,生成的一次粒子大小随着晶化时间的延长逐渐增大,随着晶化温度的升高、初始溶液浓度的增大而减小. 相似文献
228.
ZHANG Xinbao D. E. Walling FENG Mingyi & WEN Anbang . Chengdu Institute of Mountain Hazards Environment Chinese Academy of Sciences 《科学通报(英文版)》2003,48(8):813-818
Throughout the past decade, the potential for using nuclear weapon-produced 137Cs ( half-life 30.2 a) fallout to quantify soil erosion rates on both cultivated and uncul- tivated lands for medium-term timescales (≈ 40 a) has been successfully demonstrated in a wide range of envi- ronments in different regions of the world[1—6]. Because in difficulties of distinguishing Chernobyl-derived compo- nent from total 137Cs input in many parts of Europe, and in measuring low activity samples of… 相似文献
229.
Holocene lake deposits of Bosten Lake, southern Xinjiang, China 总被引:9,自引:0,他引:9
B.Wünnemann 《科学通报(英文版)》2003,48(14):1429-1432
A 9.25-m-long sediment core from Bosten Lake,Xinjiang, provides detailed information about changes in the water budget and biological acticity over the last 8400 cal-endar years. The chronology is constructed from six AMS radiocarbon dates on the terrestrial plant remains. Based onanalyses of TOC, CO3, detrital compounds and biogenic SiO2,lake level fluctuations and periods of remarkably-negative water budget appeared at 8.4-8.2 cal ka, 7.38-7.25 cal ka,5.7-5.5 cal ka, 3.7-3.4 cal ka and 3.3-2.9 cal ka, respec-tively. As they are in-phase with low lake levels at Sumxl Co and Bangong Co in western Tibet Plateau and with paleo-lakes in Inner Mongolia, a climate-induced change to some-what drier and warmer conditions is inferred. A further drop in lake level after 1320 AD of about 200 yr duration may heattributed to a negative water balance prior to the main phase of the Little Ice Age. Deep and stable lake phases of 1500 yr and 1800 yr duration at 7.2-5.7 cal ka and 5.5-3.7cal ka coincide with maximum moisture during the Holocene Megathermai in China. The long term trend towards aridity since about 4.3 cal ka can dearly be recognised. The reduced water budget of Bosten Lake from 640-1200 AD may be attributed to local effects. 相似文献
230.
南澳岛及其附近岛屿夏季鸟类的初步调查 总被引:4,自引:0,他引:4
作者一行于 2 0 0 1年夏季对南澳及其附近岛屿的鸟类资源状况进行了调查研究 .结果发现 ,南澳及其附近岛屿有鸟类 51种 ,隶属 1 3目 2 8科 ,其中雀形目 2 3种 ,占所发现种类的 45% ,非雀形目 2 8种 ,占 55% ;国家一、二级保护动物各一种 ,分别为 :白腹军舰鸟 (F regataandrewsi)和岩鹭 (Egretta sacra) .按鸟类的栖息和迁徙习惯划分 ,有海鸟 8种 ,湿地候鸟 2种 ,湿地留鸟 9种 ,陆地候鸟 4种 ,陆地留鸟 2 8种 .在所有鸟类中以褐翅燕鸥 (Sterna anae-thetus)为优势种 ,数量最大 ,分布最广 . 相似文献