首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   203161篇
  免费   10973篇
  国内免费   130篇
林业   8354篇
农学   6292篇
基础科学   1421篇
  24795篇
综合类   36526篇
农作物   7756篇
水产渔业   9851篇
畜牧兽医   102509篇
园艺   2809篇
植物保护   13951篇
  2018年   3319篇
  2017年   3539篇
  2016年   2918篇
  2015年   2228篇
  2014年   2677篇
  2013年   7310篇
  2012年   5309篇
  2011年   7155篇
  2010年   4943篇
  2009年   4856篇
  2008年   6800篇
  2007年   6623篇
  2006年   5701篇
  2005年   5333篇
  2004年   5140篇
  2003年   5210篇
  2002年   4980篇
  2001年   6137篇
  2000年   5979篇
  1999年   4779篇
  1998年   1927篇
  1997年   2007篇
  1996年   1886篇
  1995年   2308篇
  1994年   2117篇
  1993年   2028篇
  1992年   4254篇
  1991年   4442篇
  1990年   4398篇
  1989年   4411篇
  1988年   4101篇
  1987年   4213篇
  1986年   4342篇
  1985年   4189篇
  1984年   3450篇
  1983年   3053篇
  1982年   2147篇
  1981年   1955篇
  1979年   3169篇
  1978年   2646篇
  1977年   2277篇
  1976年   2092篇
  1975年   2206篇
  1974年   2905篇
  1973年   2930篇
  1972年   2855篇
  1971年   2569篇
  1970年   2433篇
  1969年   2253篇
  1967年   1951篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Nesquehonite, a hydrous magnesium carbonate, occurs as a weathering product on the surface of the Antarctic meteorite LEW 85320(H5 chondrite). Antarctic meteorites have resided on the earth for periods of 10(4) to 10(6) years, but the time needed for weathering products to form has been uncertain. Isotopic measurements of delta(13)C and delta(18)O indicate that the nesquehonite formed at near freezing temperatures by reaction of meteoritic minerals with terrestrial water and carbon dioxide. Results from carbon-14 dating suggest that, although the meteorite has been in Antarctica for at least 3.2 x 10(4) to 3.3 x 10(4) years, the nesquehonite formed after A.D.1950.  相似文献   
972.
973.
974.
Research at La Venta, a major Olmec center on a low salt dome 12 kilometers from the Gulf Coast has revealed evidence of initial occupation (about 1750 to 1400 B.C.) along levees of the silted-in Río Barí, north of the site core in a transitional estuarine-riverine environment. Between 1400 and 1150 B.C. settlement expanded to nearby La Venta itself, which between 1150 and 800 B.C. developed into a major temple-town complex. Local development peaked at La Venta and along the river levees between 800 and 500 B.C. In this span La Venta headed a local three-tiered site hierarchy as social distinctions expanded to the peripheral Río Barí sites. New excavations show that growth in population size and density at La Venta preceded the development of sociopolitical complexity. These data contradict the traditional organizational reconstruction of Olmec society, the "vacant ceremonial center" model, and provide qualified support for a model that presents riverine resource concentration as a significant factor in the evolution of Olmec civilization.  相似文献   
975.
976.
Penicillin, oxytetracycline, and a trimethoprimsulfadoxine combination were compared as first choice antibiotics for the treatment of acute bovine respiratory disease in weaned beef calves. There was no statistical difference in the mortality losses due to respiratory disease; however, the case fatality rate in the trimethoprim-sulfadoxine treatment group (3%) was markedly lower than in the penicillin (10%) and oxytetracycline (8%) treatment groups. The trimethoprim-sulfadoxine group also had statistically fewer treatment days compared to the penicillin and oxytetracycline groups (p < 0.05). Inclusion of mortality costs in the calculation of treatment costs demonstrated that treatment of the trimethoprimsulfadoxine group was appreciably less costly than treatment of the other groups. Temperature response abnormalities, defined as either an elevation in temperature or a failure of temperature to drop from one treatment day to the next, were associated with a relapse rate of approximately 50%. In vitro antibiotic sensitivity testing of Pasteurella haemolytica isolated from pretreatment nasal swabs was not a useful predictor of treatment success of antimicrobials.  相似文献   
977.
978.
Six shipments totaling 3452 mummies of the blackmargined aphid,Monellia caryella (Fitch), parasitized withAphelinus perpallidus Gahan, were obtained by air freight during the years 1982-1985 from Texas A&M Research Center, El Paso, Texas. About two-thirds of the mummies did not yield parasites. A colony ofA. perpallidus was established in the laboratory. Under laboratory conditions the percentage of emerged parasites was higher than that in the imported mummies, and the parasite had very limited impact on the aphid population. Field releases of the parasite were made but no establishment ofA. perpallidus was observed through the years.  相似文献   
979.
Data are presented on 25 species of aphids recorded in Israel during the last 25 years. Information is provided on their host plants, localities and dates of collection. The occurrence of 11 of these species has not been reported previously. Three of the species are noxious:Cinara cupressi (Buckton),Monellia caryella (Fitch) andAphis citricola van der Goot (= ?A. spiraecola Patch).  相似文献   
980.
Samenvatting In 1986 werd een ernstige schurft-aantasting bij peen (Daucus carota) gevonden met name in NO-Nederland. Vanuit schurftlesies werd steeds weer eenzelfde type streptomyceet geïsoleerd. In proeven met zeven isolaten van peen en één van aardappel bleek dat deze morfologisch en biochemisch sterk overeen kwamen, terwijl alle isolaten, ook dat van aardappel, pathogeen waren voor peen Amsterdamse bak.De hier onderzochte isolaten komen sterk overeen met een soort die in de literatuur bekend is alsStreptomyces scabies, de veroorzaker van aardappelschurft.S. scabies is echter een ongeldige naam door het ontbreken van een typestam. Zolang er niet een geldig neotype is gepubliceerd kan geen speciesnaam aan deze isolaten worden gegeven. Taxonomisch en nomenclatorisch onderzoek is dus gewenst, evenals onderzoek naar schade, invloed van vruchtwisseling met aardappel en/of andere gewassen en effectieve bestrijding (wellicht door beregening?) van schurft bij peen.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号