全文获取类型
收费全文 | 1645篇 |
免费 | 199篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 69篇 |
妇产科学 | 11篇 |
基础医学 | 252篇 |
口腔科学 | 75篇 |
临床医学 | 163篇 |
内科学 | 381篇 |
皮肤病学 | 32篇 |
神经病学 | 98篇 |
特种医学 | 142篇 |
外科学 | 235篇 |
综合类 | 29篇 |
预防医学 | 157篇 |
眼科学 | 30篇 |
药学 | 60篇 |
中国医学 | 2篇 |
肿瘤学 | 110篇 |
出版年
2023年 | 7篇 |
2022年 | 11篇 |
2021年 | 23篇 |
2020年 | 17篇 |
2019年 | 26篇 |
2018年 | 29篇 |
2017年 | 24篇 |
2016年 | 30篇 |
2015年 | 34篇 |
2014年 | 48篇 |
2013年 | 54篇 |
2012年 | 84篇 |
2011年 | 95篇 |
2010年 | 66篇 |
2009年 | 55篇 |
2008年 | 67篇 |
2007年 | 67篇 |
2006年 | 71篇 |
2005年 | 64篇 |
2004年 | 61篇 |
2003年 | 69篇 |
2002年 | 51篇 |
2001年 | 55篇 |
2000年 | 59篇 |
1999年 | 50篇 |
1998年 | 45篇 |
1997年 | 32篇 |
1996年 | 32篇 |
1995年 | 41篇 |
1994年 | 28篇 |
1993年 | 38篇 |
1992年 | 38篇 |
1991年 | 38篇 |
1990年 | 40篇 |
1989年 | 43篇 |
1988年 | 33篇 |
1987年 | 29篇 |
1986年 | 21篇 |
1985年 | 25篇 |
1984年 | 15篇 |
1983年 | 12篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1979年 | 12篇 |
1975年 | 6篇 |
1974年 | 7篇 |
1970年 | 6篇 |
1968年 | 6篇 |
1966年 | 6篇 |
排序方式: 共有1851条查询结果,搜索用时 15 毫秒
1.
2.
Veena Kumari Jeffrey A. Gray Philip J. Corr Owen F. Mulligan Paul A. Cotter Stuart A. Checkley 《Psychopharmacology》1997,129(3):271-276
The effects of an indirect dopamine-agonist, d-amphetamine, and a non-selective dopamine receptor antagonist, haloperidol, were investigated in normal male volunteers using
a between-subjects double-blind design in a procedural learning task, thought mainly to involve unconscious/automatic learning.
The results showed: (1) d-amphetamine facilitated response speed, whereas haloperidol inhibited it, in comparison to placebo; (2) the linear increase
in procedural learning corresponded with pharmacological manipulation of degree of dopaminergic activity, i.e. subjects given
haloperidol showed the least, and subjects given d-amphetamine the greatest, procedural learning. The implications of these findings are discussed in relation to investigation
of abnormalities of procedural learning processes in schizophrenia.
Received: 28 June 1996/Final version: 2 October 1996 相似文献
3.
Kristin Mekeel David Mulligan Kunam Sudhakar Reddy Adyr Moss Kristi Harold 《Liver transplantation》2007,13(11):1576-1581
Incisional hernias occur in up to 17% of patients after liver transplantation. Laparoscopic ventral hernia repair is associated with fewer wound complications and a decreased incidence of recurrence when compared to open hernia repair in nontransplant patients. This is a retrospective review of 13 patients who underwent laparoscopic incisional hernia repair (LAP group) after liver transplantation compared to 14 patients who had open repairs (OP group; all but one with mesh). Primary immunosuppression in both groups at the time of transplantation was tacrolimus, but more patients in the LAP group were on sirolimus at the time of hernia, while more patients in the OP group were on prednisone at the time of hernia repair. All operations were completed with a laparoscopic approach; there were no conversions to open. Length of stay differed significantly between the 2 groups, with a mean of 5.4 days for the LAP group compared to 2.7 days in the OP group (0.0059). Complications occurred in 2 (15%) of the patients in the LAP group and 5 (36%) in the OP group. One patient in the LAP group required mesh removal to exclude causes of recurrent ascites, and 1 in the OP group for mesh infection. One (7.6%) of the patients in the LAP group developed a recurrence, compared to 29% (4) of the OP group (P =0.3259). In conclusion, laparoscopic incisional hernia repair is safe in patients after liver transplantation, with a low risk of infection or recurrence. 相似文献
4.
TF Leung WC Tsoi CK Li KW Chik MMK Shing PMP Yuen 《Acta paediatrica (Oslo, Norway : 1992)》1998,87(6):705-777
We describe a 15-y-old girl with Fechtner-like syndrome, who is the first Chinese reported to have this rare syndrome. She presented with left homonymous hemianopia and neuroimaging revealed haemorrhage in both parietal and occipital lobes. Peripheral blood smear showed macrothrombocytopenia and intracytoplasmic inclusion bodies inside leucocytes. Thrombocytopenia and proteinuria responded to intravenous immunoglobulin and pulsed methylprednisolone. This case illustrates that life-threatening haemorrhage can occur in patients with Fechtner syndrome. Although there was no effective treatment reported in the literature, high dose steroid and immunoglobulin seemed to be useful in our patient. Our patient also had nephritic-nephrotic syndrome with renal insufficiency, which is unusual in adolescent female patients. 相似文献
5.
6.
Geraldo F. Busatto Lyn S. Pilowsky Durval C. Costa John Mertehs Dirk Terriere Peter J. Ell Rachel Mulligan Michael J. Travis Josée E. Leysen Dominic Lui Sveto Gacinovic Wendy Waddington Anne Lingford-Hughes Robert W. Kerwin 《European journal of nuclear medicine and molecular imaging》1997,24(2):119-124
The mapping of 5-HT2 receptors in the brain using functional imaging techniques has been limited by a relative lack of selective radioligands.
Iodine-123 labelled 4-amino-N-[1-[3-(4-fluorophenoxy)propyl]-4-methyl-4-piperidinyl]-5-iodo-2-methoxybenzamide (123I-5-I-R91150 or123I-R93274) is a new ligand for single-photon emission tomography (SPET), with high affinity and selectivity for 5-HT2A receptors. This study reports on preliminary123I-5-I-R91150 SPET, wholebody and blood distribution findings in five healthy human volunteers. Maximal brain uptake was approximately
2% of total body counts at 180 min post injection (p.i.). Dynamic SPET sequences were acquired with the brain-dedicated, single-slice
multi-detector system SEM-810 over 200 min p.i. Early peak uptake (at 5 min p.i.) was seen in the cerebellum, a region free
from 5HT2A receptors. In contrast, radioligand binding in the frontal cortex increased steadily over time, up to a peak at approximately
100–120 min p.i. Frontal cortex-cerebellum activity ratios reached values of 1.4, and remained stable from approximately 100
min p.i. onwards. Multi-slice SPET sequences showed a pattern of regional variation of binding compatible with the autoradiographic
data on the distribution of 5-HT2A receptors in (cerebral cortex>striatum>cerebellum). These findings suggest that123I-5-I-R91150 may be used for the imaging of 5-HT2A receptors in the living human brain with SPET. 相似文献
7.
8.
Daily administration of an escalating dose of tumour necrosis factor-alpha (TNF-alpha) to female NMRI mice caused a progressive loss of body weight representing 12% of the original weight over a 6-day period. Weight loss was associated with a decreased food intake and pair-fed controls exhibited a weight loss of similar magnitude to that caused by TNF-alpha. However, weight loss in animals bearing a murine adenocarcinoma (MAC16) occurred without a change in energy intake and thus differed from that produced by TNF-alpha. Anti-TNF-alpha monoclonal antibodies at levels capable of protecting mice against lethal endotoxaemia were ineffective in reversing weight loss in animals bearing the MAC16 tumour and had no effect on the increase in tumour volume. Circulating levels of interleukin-6 were not elevated in animals bearing the MAC16 tumour and with a weight loss between 1.8 and 5.4 g. These results suggest that these cytokines are not involved in the cachexia produced by this murine tumour. 相似文献
9.
10.
J G Devane S Mulligan M Kavanagh S S Davis R A Sparrow I R Wilding 《The American journal of cardiology》1992,69(13):23E-27E
In order to achieve a consistently absorbed form of nifedipine over 24 hours, a novel formulation approach, INDAS, was used to develop a once-daily, sustained-release (SR) form of nifedipine that could provide effective control of blood pressure at a low total daily dose. The pharmacokinetic characteristics of this new formulation of nifedipine-SR were compared with those of divided doses of conventional nifedipine. The SR formulation was shown to achieve a lower peak plasma nifedipine level but with a prolonged plasma profile characterized by an extended time to peak plasma levels (Tmax), a higher trough plasma level, a longer apparent half-life, and a markedly lower peak-to-trough fluctuation in plasma nifedipine concentrations. In a separate study, the gastrointestinal transit parameters and physical characteristics of the SR tablet were evaluated. This study established that the large intestine is the major site of residence and absorption for this dosage form. The physical erosion and disintegration characteristics of the SR formulation are such that a well-maintained absorption of nifedipine is consistently achieved over the 24 hour dosing interval. 相似文献