全文获取类型
收费全文 | 24871篇 |
免费 | 1286篇 |
国内免费 | 10篇 |
专业分类
林业 | 876篇 |
农学 | 752篇 |
基础科学 | 154篇 |
3613篇 | |
综合类 | 3529篇 |
农作物 | 914篇 |
水产渔业 | 1338篇 |
畜牧兽医 | 13165篇 |
园艺 | 268篇 |
植物保护 | 1558篇 |
出版年
2019年 | 250篇 |
2018年 | 415篇 |
2017年 | 507篇 |
2016年 | 470篇 |
2015年 | 337篇 |
2014年 | 458篇 |
2013年 | 960篇 |
2012年 | 794篇 |
2011年 | 950篇 |
2010年 | 686篇 |
2009年 | 669篇 |
2008年 | 965篇 |
2007年 | 917篇 |
2006年 | 808篇 |
2005年 | 735篇 |
2004年 | 645篇 |
2003年 | 705篇 |
2002年 | 605篇 |
2001年 | 803篇 |
2000年 | 799篇 |
1999年 | 634篇 |
1998年 | 274篇 |
1997年 | 282篇 |
1995年 | 259篇 |
1994年 | 227篇 |
1993年 | 232篇 |
1992年 | 424篇 |
1991年 | 516篇 |
1990年 | 434篇 |
1989年 | 411篇 |
1988年 | 400篇 |
1987年 | 409篇 |
1986年 | 363篇 |
1985年 | 388篇 |
1984年 | 339篇 |
1983年 | 287篇 |
1982年 | 243篇 |
1979年 | 383篇 |
1978年 | 289篇 |
1977年 | 290篇 |
1976年 | 299篇 |
1975年 | 317篇 |
1974年 | 332篇 |
1973年 | 302篇 |
1972年 | 290篇 |
1971年 | 245篇 |
1969年 | 289篇 |
1968年 | 269篇 |
1967年 | 326篇 |
1966年 | 304篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
C. G. M. Paxton J. M. Fletcher D. P. Hewitt I. J. Winfield 《Ecology of Freshwater Fish》1999,8(2):78-84
Abstract– Analysis of the Windermere (England), Perca fluviatilis (1965–1997) and Esox lucius (1943-1997) fishery data indicates there have been substantial changes in sex ratios through time. In the case of perch, a 1976 perch disease outbreak substantially skewed the sex ratio in favor of females. It took over a decade for the fishery to recover to its pre-1976 state. In the case of pike, both catch and year-class data are female biased, but this bias has significantly weakened through time. This trend towards proportionately more males through time may reflect an effect of increasing spring temperatures or an evolutionary or phenotypic response to female-biased fishing pressure. 相似文献
942.
Barnes I 《Science (New York, N.Y.)》1970,168(3934):973-975
Waters unusually rich in ammonia, boron, carbon dioxide, hydrogen sulfide, and hydrocarbons are found in more than 100 localities along the Pacific coast of the United States. The waters are believed to be products of low-grade metamorphism of marine sediments. The marine sedimentary rocks would have to be tectonically emplaced below crystalline rocks in many places. Mercury ore deposits are probably also products of the low-grade metamorphism. 相似文献
943.
J.?StrandEmail author L.?Andersen I.?Dahll?f B.?Korsgaard 《Fish physiology and biochemistry》2004,30(1):37-46
Eelpouts (Zoarces viviparus), a viviparous fish, were sampled in Danish coastal waters during October and November 2001 and 2002, in ten different areas, which are receiving effluents from cities and industry to more or minor degree. The presence of gross abnormalities in eelpout broods has been suggested to be a useful biomarker of the impact of hazardous substances on fish reproduction in the marine environment as chronic exposure to various substances has the potential to induce severe developmental defects in fish embryos and larvae. Relatively high frequencies of female eelpouts (20–53) with elevated levels (>5) of larvae with developmental defects in the broods were found in four shallow fjords with effluents from larger cities and industry compared to areas. Deformations like spiral or bend shapes of the spinal axis, cranio-facial defects, eye lesions or loss of eyes were the dominating types. In some ofthe areas with the highest incidences of developmental defects, the adults had significantly enlarged livers, which may also be a possible effect caused by contaminant exposure. In two of the areas, relatively high frequencies of the broods contained larvae, which had died late but without any visible developmental defects. These two areas were affected by severe oxygen depletion prior to sampling time suggesting that examination of broods in the eelpout may include not only impact of hazardous substances but also effect of eutrophication-related problems on fish reproduction in the marine environment. 相似文献
944.
The effect of chronic lead intoxication in mature chickens 总被引:1,自引:0,他引:1
In a study of chronic lead intoxication in mature chickens, blood lead levels were significantly lower in hens than in roosters receiving the same oral dose of lead. It was then shown that eggshells from lead-treated hens contained 6-12 times the lead concentration of eggshells from control hens. Similarly, the lead content of egg yolks from treated hens was significantly higher than yolks from controls. Lead-treated hens laid significantly more eggs during the period of observation of nearly 3 years because of the increased frequency of laying cycles, which was almost three times that of control hens. A further observation was histologic damage to the mature testes of the rooster. 相似文献
945.
946.
I. Cornelis T. Bosmans M. Doom D. Binst E. Van der Vekens K. Kromhout P. Cornillie L. Van Ham 《The Journal of small animal practice》2014,55(6):337-339
A three‐year‐old neutered male whippet was presented with intermittent, exercise‐induced paraparesis. Femoral pulses were bilaterally absent. Neurologic examination was suggestive of a thoracolumbar myelopathy. Blood pressure measurements revealed hypotension in both pelvic limbs, hypertension in the right thoracic limb and it was immeasurable in the left thoracic limb. Echocardiography was within reference limits. A clear vascular pulsation was palpable on the right ventral abdominal wall. Computed tomographic angiography revealed a dissection of the aortic wall between the left subclavian artery and the brachiocephalic trunk with subsequent thrombus formation. A shunt between the right internal thoracic, cranial and caudal epigastric arteries to preserve blood flow to the pelvic limbs was visualized. Necropsy was declined by the owner. This is the first case report describing the formation of a unilateral vascular shunt following a thoracic aortic occlusion, which presented as exercise‐induced paraparesis . 相似文献
947.
948.
949.
Growth and carbon economy of nodulated white clover in the presence and absence of combined nitrogen
An investigation of the carbon economy of single S184 white clover plants nodulated with an effective strain of Rhizobium trifolii growing on N-free nutrient solution and supplied with 150 parts/106 N as NH4NO3 has shown that 10% more of the C fixed per day is available for growth in the plants supplied with combined N. The difference between the two groups of plants is a result of higher respiratory activity in the roots of plants growing exclusively on N2. In terms of shoot growth, however, the difference in growth rate is likely to be less than 10%, because the rate of root growth is greater in the plants supplied with a moderate level of combined N. There is no evidence that NO-3 and CO2 compete for photosynthetically produced reductant in the leaves of plants grown on N2+NH4NO3, since no reduction in net photosynthesis was observed in plants assimilating combined N. An experiment carried out on detached leaflets of white clover grown on N2 and on N2+ NH4NO3 has shown that NO-3 -reducing activity is present in the leaflets of plants grown on N2+ NH4NO3 but not in plants grown on N2 and that the activity is light-dependent. Measurements of 14CO2 respired in the light and dark by leaflets previously allowed to photosynthesize 14CO2 showed that the ratio of 14CO2 output in the light to 14CO2 output in the dark was no higher in plants grown on N2+ NH4NO3 than in plants grown on N2. This observation is consistent with the finding that N source does not affect net photosynthesis in whole plants. 相似文献
950.