全文获取类型
收费全文 | 165004篇 |
免费 | 6793篇 |
国内免费 | 353篇 |
专业分类
耳鼻咽喉 | 2224篇 |
儿科学 | 4754篇 |
妇产科学 | 3820篇 |
基础医学 | 23787篇 |
口腔科学 | 5479篇 |
临床医学 | 9444篇 |
内科学 | 36471篇 |
皮肤病学 | 4539篇 |
神经病学 | 13302篇 |
特种医学 | 4005篇 |
外国民族医学 | 1篇 |
外科学 | 18969篇 |
综合类 | 770篇 |
一般理论 | 24篇 |
预防医学 | 19955篇 |
眼科学 | 4332篇 |
药学 | 12962篇 |
中国医学 | 672篇 |
肿瘤学 | 6640篇 |
出版年
2023年 | 842篇 |
2022年 | 590篇 |
2021年 | 2522篇 |
2020年 | 1427篇 |
2019年 | 2876篇 |
2018年 | 5015篇 |
2017年 | 3117篇 |
2016年 | 3094篇 |
2015年 | 3469篇 |
2014年 | 3816篇 |
2013年 | 5825篇 |
2012年 | 10159篇 |
2011年 | 10744篇 |
2010年 | 5301篇 |
2009年 | 3872篇 |
2008年 | 8819篇 |
2007年 | 9452篇 |
2006年 | 9064篇 |
2005年 | 8657篇 |
2004年 | 8023篇 |
2003年 | 7521篇 |
2002年 | 7158篇 |
2001年 | 4885篇 |
2000年 | 5456篇 |
1999年 | 4148篇 |
1998年 | 725篇 |
1992年 | 2220篇 |
1991年 | 1993篇 |
1990年 | 1977篇 |
1989年 | 1683篇 |
1988年 | 1606篇 |
1987年 | 1503篇 |
1986年 | 1549篇 |
1985年 | 1457篇 |
1984年 | 1041篇 |
1983年 | 892篇 |
1979年 | 1205篇 |
1978年 | 806篇 |
1977年 | 781篇 |
1976年 | 742篇 |
1975年 | 876篇 |
1974年 | 1119篇 |
1973年 | 1164篇 |
1972年 | 1111篇 |
1971年 | 1076篇 |
1970年 | 1007篇 |
1969年 | 1083篇 |
1968年 | 1105篇 |
1967年 | 977篇 |
1966年 | 880篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
C R Plata-Salamán 《Brain research bulletin》1991,27(5):737-738
Intracerebroventricular (ICV) microinfusion of recombinant human interleukin-1 beta (rhIL-1 beta, 0.125 to 2.0 ng/rat) dose-dependently suppressed 2 h and nighttime food intake in rats. The following daytime food intake did not change or increased. ICV infusion of bovine serum albumin (BSA), or heat-treated rhIL-1 beta had no effect on food intake. Pretreatment with dexamethasone (200 micrograms/rat, intraperitoneal) blocked the food intake suppression induced by low doses of rhIL-1 beta. This ability of dexamethasone, a synthetic corticosteroid, may have potential therapeutic implications in acute and chronic pathological processes associated with increased levels of IL-1 and appetite suppression. 相似文献
92.
C A González G López-Abente M Errezola A Escolar E Riboli I Izarzugaza M Nebot 《International journal of epidemiology》1989,18(3):569-577
A case-control study on bladder cancer was carried out in four regions of Spain. The study included 497 cases (438 males and 59 females), 583 hospital controls and 530 population controls matched by sex, age and residence. The present paper reports the results of the analyses on occupational history. Among men, an increased risk of bladder cancer was found for textile workers (OR = 1.97, 95% CL 1.2-3.3), mechanics and maintenance workers (OR = 1.86, 95% CL 1.2-2.8), workers in the printing industry (OR = 2.06, 95% CL 1.0-4.3) and for managers (OR = 2.03, 95% CL 1.2-3.5). The risk was highest among those first employed in the textile industry before the age of 25 and prior to 1960. Among mechanics the risk was highest for those who started after the age of 25 and later than 1960. The OR for smokers who had also been employed in one of the high risk occupations was 7.82 (95% CL 4.4-14.0) which is compatible with a multiplicative effect of joint exposure to tobacco and occupational hazards. 相似文献
93.
Immunoregulators in the nervous system 总被引:15,自引:0,他引:15
C R Plata-Salamán 《Neuroscience and biobehavioral reviews》1991,15(2):185-215
The nervous system, through the production of neuroregulators (neurotransmitters, neuromodulators and neuropeptides) can regulate specific immune system functions, while the immune system, through the production of immunoregulators (immunomodulators and immunopeptides) can regulate specific nervous system functions. This indicates a reciprocal communication between the nervous and immune systems. The presence of immunoregulators in the brain and cerebrospinal fluid is the result of local synthesis--by intrinsic and blood-derived macrophages, activated T-lymphocytes that cross the blood-brain barrier, endothelial cells of the cerebrovasculature, microglia, astrocytes, and neuronal components--and/or uptake from the peripheral blood through the blood-brain barrier (in specific cases) and circumventricular organs. Acute and chronic pathological processes (infection, inflammation, immunological reactions, malignancy, necrosis) stimulate the synthesis and release of immunoregulators in various cell systems. These immunoregulators have pivotal roles in the coordination of the host defense mechanisms and repair, and induce a series of immunological, endocrinological, metabolical and neurological responses. This review summarizes studies concerning immunoregulators--such as interleukins, tumor necrosis factor, interferons, transforming growth factors, thymic peptides, tuftsin, platelet activating factor, neuro-immunoregulators--in the nervous system. It also describes the monitoring of immunoregulators by the central nervous system (CNS) as part of the regulatory factors that induce neurological manifestations (e.g., fever, somnolence, appetite suppression, neuroendocrine alterations) frequently accompanying acute and chronic pathological processes. 相似文献
94.
Synaptic contacts between growth hormone-releasing hormone (GHRH)- and somatostatin-containing neurons were demonstrated in the rat hypothalamus by a double-staining immunocytochemical method at the electron microscopic level. Somatostatin-immunoreactive nerve terminals synapse on GHRH-positive dendrites and cell bodies in the arcuate nucleus. A fine network of GHRH-immunopositive nerve terminals was observed at the light microscopic level in the rostral part of the periventricular nucleus and in the dorsal part of the arcuate nucleus around somatostatin-containing neuronal elements. With the electron microscope synaptic contact between GHRH-containing nerve terminals and somatostatin-containing dendrites are demonstrated. The reciprocal innervation between GHRH- and somatostatin-containing neurons that project to the median eminence and regulate growth hormone secretion must allow them to coordinate their activities. 相似文献
95.
96.
97.
Pilar Nicolás 《Hereditary cancer in clinical practice》2007,5(3):144-152
The specific characteristics of genetic data lead to ethical-legal conflicts in the framework of genetic diagnosis. Several international organisations, including UNESCO and the Council of Europe, have enacted rules referring to the use of genetic information. This paper discusses possible legal and ethical criteria that could be used in genetic testing. 相似文献
98.
Cyclodextrin formulation of dorzolamide and its distribution in the eye after topical administration. 总被引:2,自引:0,他引:2
Hakon H Sigurdsson Einar Stefánsson Elínborg Gudmundsdóttir Thór Eysteinsson Margrét Thorsteinsdóttir Thorsteinn Loftsson 《Journal of controlled release》2005,102(1):255-262
Due to limited aqueous solubility of dorzolamide at physiologic pH, the pH of Trusopt eye drops (cont. 2% dorzolamide) has to be kept at about 5.65, and to increase the topical bioavailability of the drug from Trusopt the contact time of the drug with the eye surface is increased by increasing the viscosity of the eye drops to 100 cps. This low pH and high viscosity can lead to local irritation. In this study, dorzolamide hydrochloride was formulated as 2% and 4% low viscosity solutions (viscosity 3 to 5 cps) containing randomly methylated beta-cyclodextrin at pH 7.45. These formulations were evaluated in rabbits. The animals were sacrificed at various time points after topical administration of the drug and the dorzolamide concentration determined in the different parts of the eye. Trusopt was used as a reference standard. The topical availability of dorzolamide from the cyclodextrin-containing eye drops appeared to be comparable to that from Trusopt and the drug reached retina and optic nerve to give measurable concentrations for at least 8 h after administration of the eye drops. 相似文献
99.
G Adám 《Orvosi hetilap》1986,127(21):1291-1293
100.