全文获取类型
收费全文 | 10136篇 |
免费 | 1045篇 |
国内免费 | 46篇 |
专业分类
耳鼻咽喉 | 64篇 |
儿科学 | 299篇 |
妇产科学 | 117篇 |
基础医学 | 1191篇 |
口腔科学 | 566篇 |
临床医学 | 1085篇 |
内科学 | 1891篇 |
皮肤病学 | 143篇 |
神经病学 | 663篇 |
特种医学 | 513篇 |
外科学 | 1061篇 |
综合类 | 443篇 |
一般理论 | 1篇 |
预防医学 | 1362篇 |
眼科学 | 286篇 |
药学 | 882篇 |
中国医学 | 44篇 |
肿瘤学 | 616篇 |
出版年
2021年 | 121篇 |
2020年 | 80篇 |
2019年 | 137篇 |
2018年 | 142篇 |
2017年 | 120篇 |
2016年 | 138篇 |
2015年 | 178篇 |
2014年 | 236篇 |
2013年 | 364篇 |
2012年 | 392篇 |
2011年 | 472篇 |
2010年 | 318篇 |
2009年 | 262篇 |
2008年 | 347篇 |
2007年 | 400篇 |
2006年 | 398篇 |
2005年 | 428篇 |
2004年 | 474篇 |
2003年 | 425篇 |
2002年 | 486篇 |
2001年 | 441篇 |
2000年 | 377篇 |
1999年 | 327篇 |
1998年 | 247篇 |
1997年 | 229篇 |
1996年 | 172篇 |
1995年 | 132篇 |
1994年 | 144篇 |
1993年 | 152篇 |
1992年 | 190篇 |
1991年 | 192篇 |
1990年 | 235篇 |
1989年 | 232篇 |
1988年 | 182篇 |
1987年 | 189篇 |
1986年 | 178篇 |
1985年 | 142篇 |
1984年 | 131篇 |
1983年 | 119篇 |
1982年 | 84篇 |
1981年 | 76篇 |
1980年 | 57篇 |
1979年 | 95篇 |
1978年 | 77篇 |
1977年 | 69篇 |
1976年 | 71篇 |
1975年 | 64篇 |
1974年 | 61篇 |
1973年 | 68篇 |
1970年 | 57篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Angiogenic factors prepared from rat Walker 256 mammary carcinoma, (TAF) and activated mouse peritoneal macrophages (MAF), were tested for their ability to stimulate vascularization during healing. They were applied to one of a pair of bilaterally symmetrical, autologous, isotopic, full thickness skin grafts in mice. Blood flow to treated and untreated graft pairs was compared by their uptake of injected 86Rb Cl, at 3 and 7 days after grafting. No difference was detected after treatment with either agent. We conclude that while angiogenic factors are important in vascularization during healing, this normally occurs at a near maximal rate and cannot be further enhanced. 相似文献
83.
Inguinal abscess caused by Rhizopus rhizopodiformis: successful treatment with surgery and amphotericin B 下载免费PDF全文
B C West K J Kwon-Chung J W King W D Grafton M S Rohr 《Journal of clinical microbiology》1983,18(6):1384-1387
Rhizopus rhizopodiformis has seldom been isolated from human mucormycosis. We report the first subcutaneous abscess to be caused by this fungus. It occurred in a diabetic man and presented as an inguinal mass, suggestive of a hernia, superficial to his cadaveric renal transplant. The fungus was readily isolated from pus inoculated onto blood and chocolate agars after a short incubation. The patient was cured by surgical drainage and treatment with 2.0 g of intravenous amphotericin B. Complete identification of such isolates is recommended. 相似文献
84.
Protriptyline in obstructive sleep apnea: a double-blind trial 总被引:6,自引:0,他引:6
L G Brownell P West P Sweatman J C Acres M H Kryger 《The New England journal of medicine》1982,307(17):1037-1042
We evaluated protriptyline, a nonsedating tricyclic antidepressant, as a treatment for obstructive sleep apnea in a double-blind crossover study of five men. After two weeks of treatment, with no change in body weight, daytime somnolence was markedly reduced and nocturnal oxygenation was improved, although apnea duration and frequency were not significantly decreased. Rapid-eye-movement (REM) stage time as a fraction of the total sleep time was reduced during treatment from 0.231 +/- 0.031 to 0.107 +/- 0.013 (mean +/- S.E.M.) (P less than 0.05). REM apnea time as a fraction of total sleep time was reduced from 0.145 +/- 0.022 to 0.054 +/- 0.006 (P less than 0.05). REM reduction during treatment with protriptyline can account for decreased REM apnea time. Similar decreases in REM stage time and REM apnea duration and similar improvement in oxygenation continued after six months of treatment. In addition, body weight, apnea, and arousal frequency were decreased at this time. Although the obstructive sleep apnea was not resolved, it was reduced. Protriptyline can be effective in patients with sleep apnea when the disorder is not life-threatening. 相似文献
85.
86.
High risk pregnancies in hypopituitary women 总被引:1,自引:0,他引:1
Overton CE Davis CJ West C Davies MC Conway GS 《Human reproduction (Oxford, England)》2002,17(6):1464-1467
BACKGROUND: Various short papers have suggested that pregnancies in women with hypopituitarism are high risk but no formal assessment of pregnancy outcome has yet been reported. METHODS: An audit was carried out concerning the outcome of 18 pregnancies in nine women who underwent ovulation induction in a single centre over 20 years. RESULTS: The live birth rate was 61%, miscarriage rate 28% and mid-trimester uterine death rate 11% with no survivors from four sets of twins. The Caesarian section rate was 100% and half of the live births were on or below the 10th centile for weight. One woman successfully breast-fed. CONCLUSIONS: Women with hypopituitarism have high-risk pregnancies, perhaps because of a uterine defect secondary to endocrine deficiency. Fertility treatment must strive for singleton pregnancies with application of particularly strict criteria to avoid twin pregnancies. Early elective Caesarian section is probably warranted in this group. 相似文献
87.
88.
89.
90.
Noxious stimulus-induced increase in spinal prostaglandin E2 is noradrenergic terminal-dependent 总被引:1,自引:0,他引:1
Prostaglandins (PGs) were measured in perfusate from the lumbar intrathecal (IT) space of pentobarbital anaesthetized rats. The level of PGE2, but not of PGF2 alpha or 6-keto PGF1 alpha, was increased by immersion of a hindpaw in water at a noxious temperature (50 degrees C). No increase in PGE2 was produced by non-noxious thermal stimulation (35 degrees C water). The noxious stimulus-evoked increase in PGE2, and increases in PGE2 during norepinephrine infusion (10 micrograms/ml), were significantly decreased in rats pretreated with intrathecal 6-hydroxydopamine. These data suggest that noxious stimuli induce an increase in the production of spinal PGE2 and that this production derives from, or requires the presence of noradrenergic terminals in the spinal cord. 相似文献