全文获取类型
收费全文 | 327279篇 |
免费 | 17807篇 |
国内免费 | 1298篇 |
专业分类
林业 | 25348篇 |
农学 | 14836篇 |
基础科学 | 3277篇 |
49496篇 | |
综合类 | 42390篇 |
农作物 | 17846篇 |
水产渔业 | 18902篇 |
畜牧兽医 | 140984篇 |
园艺 | 6866篇 |
植物保护 | 26439篇 |
出版年
2020年 | 3321篇 |
2019年 | 4103篇 |
2018年 | 4927篇 |
2017年 | 5458篇 |
2016年 | 5513篇 |
2015年 | 4882篇 |
2014年 | 6266篇 |
2013年 | 17027篇 |
2012年 | 9206篇 |
2011年 | 11780篇 |
2010年 | 9021篇 |
2009年 | 9265篇 |
2008年 | 10770篇 |
2007年 | 10133篇 |
2006年 | 10052篇 |
2005年 | 9208篇 |
2004年 | 8836篇 |
2003年 | 8722篇 |
2002年 | 7969篇 |
2001年 | 8870篇 |
2000年 | 8668篇 |
1999年 | 7466篇 |
1998年 | 4424篇 |
1997年 | 4318篇 |
1996年 | 4030篇 |
1995年 | 4711篇 |
1994年 | 4152篇 |
1993年 | 3832篇 |
1992年 | 5809篇 |
1991年 | 6190篇 |
1990年 | 5991篇 |
1989年 | 5966篇 |
1988年 | 5354篇 |
1987年 | 5430篇 |
1986年 | 5321篇 |
1985年 | 5342篇 |
1984年 | 4811篇 |
1983年 | 4395篇 |
1982年 | 3381篇 |
1981年 | 3188篇 |
1980年 | 3147篇 |
1979年 | 4318篇 |
1978年 | 3665篇 |
1977年 | 3308篇 |
1976年 | 3212篇 |
1975年 | 3127篇 |
1974年 | 3509篇 |
1973年 | 3535篇 |
1972年 | 3211篇 |
1971年 | 3055篇 |
排序方式: 共有10000条查询结果,搜索用时 828 毫秒
71.
Alexander Jarryd Ehlers Smith David A. Ehlers Smith Yvette C. Downs Colleen T. 《Landscape Ecology》2019,34(3):537-549
Landscape Ecology - The effects of changing land use, and especially urbanisation, on species and functional diversity are of global concern. Eco-estates are a form of urban housing development... 相似文献
72.
木材硅石改性剂的制备工艺 总被引:1,自引:0,他引:1
为了降低木材硅化改性成本促其应用,直接将固态硅石粉高效液态活化,通过正交试验和极差分析优化制备了木材硅石改性剂,测试分析了浸渍改性杨木的性能。结果表明:①反应时间和原料n(SiO2)∶n(NaOH)对活化溶液的pH值、黏度和密度影响不显著,碱料种类和反应温度对活化溶液的黏度、密度、SiO2转化率、固体质量分数和生产成本影响显著,对溶液性能综合影响最大的是反应温度和碱料种类,其次是n(SiO2)∶n(NaOH)和反应时间;②pH值随反应时间、温度和n(SiO2)∶n(NaOH)增大而减小,密度、黏度、固体质量分数、SiO2转化率和模数随反应时间、温度和n(SiO2)∶n(NaOH)增大而增大,KOH活化效果更好但价格较高,综合平衡优化工艺为:反应温度200℃、碱料为NaOH、n(SiO2)∶n(NaOH)=1.715∶1、反应时间4 h;③硅石改性剂能充分渗入杨木,使其吸药量达252%,密度提高81%,抗弯强度提高69.6%,炭化温度减小89℃,残炭率提高41%,改性效果优于硅溶胶。 相似文献
73.
Vimal Nair Min Cheol Kim James A. Golen Arnold L. Rheingold Gabriel A. Castro Paul R. Jensen William Fenical 《Marine drugs》2020,18(11)
A new cytotoxic thiodepsipeptide, verrucosamide (1), was isolated along with the known, related cyclic peptide thiocoraline, from the extract of a marine-derived actinomycete, a Verrucosispora sp., our strain CNX-026. The new peptide, which is composed of two rare seven-membered 1,4-thiazepane rings, was elucidated by a combination of spectral methods and the absolute configuration was determined by a single X-ray diffraction study. Verrucosamide (1) showed moderate cytotoxicity and selectivity in the NCI 60 cell line bioassay. The most susceptible cell lines were MDA-MB-468 breast carcinoma with an LD50 of 1.26 µM, and COLO 205 colon adenocarcinoma with an LD50 of 1.4 µM. Also isolated along with verrucosamide were three small 3-hydroxy(alkoxy)-quinaldic acid derivatives that appear to be products of the same biosynthetic pathway. 相似文献
74.
Spyra Marcin Kleemann Janina Cetin Nuket Ipek Vázquez Navarrete Cesar Jesús Albert Christian Palacios-Agundez Igone Ametzaga-Arregi Ibone La Rosa Daniele Rozas-Vásquez Daniel Adem Esmail Blal Picchi Paolo Geneletti Davide König Hannes J. Koo HongMi Kopperoinen Leena Fürst Christine 《Landscape Ecology》2019,34(7):1715-1735
Landscape Ecology - Several case studies investigated the role of ecosystem services in participatory planning processes. However, no systematic study exists that cuts across a large number of... 相似文献
75.
山羊肺淋巴系的研究 总被引:2,自引:0,他引:2
24例山羊肺经肺实质和肺胸膜下注射30%普鲁士蓝氯仿溶液,剖查其器官内淋巴管及淋巴流向。结果表明,山羊肺的器官内淋巴管有浅淋巴管和深淋巴管2种。左肺尖叶淋巴管注入左支气管肺淋巴结和气管支气管左淋巴结,左肺心叶淋巴管注入左支气管肺淋巴结、气管支气管左淋巴结和气管支气管中淋巴结,左肺膈叶淋巴管注入气管支气管左淋巴结、气管支气管中淋巴结和纵隔后淋巴结;右肺尖叶淋巴管注入右支气管肺淋巴结和气管支气管前淋巴结,右肺心叶淋巴管注入右支气管肺淋巴结和气管支气管右淋巴结,右肺膈叶淋巴管注入气管支气管右淋巴结、气管支气管中淋巴结和纵隔后淋巴结,右肺副叶淋巴管注入右支气管肺淋巴结、气管支气管中淋巴结和纵隔后淋巴结。 相似文献
76.
77.
In a feeding trial lasting for months Halothane-positive fattening pigs were put on a diet containing different concentrations of vitamin E and selenium. After a Myostress application vitamin E and selenium were additionally injected in order to examine stress resistance (CK-test) and regenerative capacity (histological examination of Musculus longissimus dorsi) of skeletal muscle. The study revealed that neither high dietary levels of vitamin E/selenium nor a vitamin E/selenium treatment applied after stress are capable of preventing stress related myopathy nor can they influence its healing up favourably. 相似文献
78.
Epidermal growth factor (EGF)-like activity was measured in mares' colostrum and milk by radioreceptor assay. Milk samples were collected from 22 mares 1 or more times during early lactation. Samples of colostrum were taken after parturition and before the foal first suckled (presuckle), within 6 hours after the foal first suckled (postsuckle), and on days 1, 2, 4, and 8 of lactation. In the 5 mares from which milk samples were obtained at each sampling time, presuckle colostral mean EGF-like activity (17.8 ng/ml) was greatest (P less than 0.05). The mean values for EGF-like activity at all other sampling times were not significantly different from each other (postsuckle colostrum, 9.7 ng/ml; day 1, 9.6 ng/ml; day 2, 8.5 ng/ml; day 4, 8.0 ng/ml; day 8, 7.8 ng/ml). 相似文献
79.
The aerobic bacterial flora of the genital tract was characterized in 15 stud dogs in an 18-month study. The dogs represented 4 breeds and were from 3 kennels. Bacterial samples from the prepuce and semen were collected every month, except in connection with matings, when they were collected weekly (464 samples). The dogs that were included all mated at least once during the study. The mean pregnancy rate, litter size, and pup mortality for the bitches with which they had mated were all within normal limits. The most frequent bacteria isolated from the prepuce and semen were Pasteurella multocida, beta-hemolytic streptococci, and Escherichia coli. There was a tendency for breeds to differ in frequency of the most common bacterial species. Bacterial culture yielded no aerobic growth in 14.2% of the preputial samples and 69.8% of the semen samples. Bacteria were transferred between dog and bitch at mating. In this study of healthy breeding dogs, neither the fertility of the dog nor that of the bitch was affected by the bacteria transferred. 相似文献
80.