全文获取类型
收费全文 | 5494篇 |
免费 | 427篇 |
国内免费 | 79篇 |
专业分类
耳鼻咽喉 | 115篇 |
儿科学 | 113篇 |
妇产科学 | 52篇 |
基础医学 | 727篇 |
口腔科学 | 211篇 |
临床医学 | 600篇 |
内科学 | 1643篇 |
皮肤病学 | 127篇 |
神经病学 | 324篇 |
特种医学 | 397篇 |
外科学 | 724篇 |
综合类 | 74篇 |
一般理论 | 2篇 |
预防医学 | 220篇 |
眼科学 | 98篇 |
药学 | 238篇 |
1篇 | |
中国医学 | 4篇 |
肿瘤学 | 330篇 |
出版年
2021年 | 66篇 |
2020年 | 45篇 |
2019年 | 74篇 |
2018年 | 90篇 |
2017年 | 67篇 |
2016年 | 75篇 |
2015年 | 106篇 |
2014年 | 139篇 |
2013年 | 173篇 |
2012年 | 213篇 |
2011年 | 248篇 |
2010年 | 163篇 |
2009年 | 186篇 |
2008年 | 206篇 |
2007年 | 243篇 |
2006年 | 250篇 |
2005年 | 237篇 |
2004年 | 248篇 |
2003年 | 177篇 |
2002年 | 186篇 |
2001年 | 196篇 |
2000年 | 193篇 |
1999年 | 141篇 |
1998年 | 132篇 |
1997年 | 122篇 |
1996年 | 131篇 |
1995年 | 102篇 |
1994年 | 101篇 |
1993年 | 87篇 |
1992年 | 114篇 |
1991年 | 99篇 |
1990年 | 110篇 |
1989年 | 117篇 |
1988年 | 102篇 |
1987年 | 101篇 |
1986年 | 113篇 |
1985年 | 102篇 |
1984年 | 56篇 |
1983年 | 53篇 |
1982年 | 36篇 |
1981年 | 35篇 |
1980年 | 27篇 |
1979年 | 56篇 |
1978年 | 37篇 |
1977年 | 37篇 |
1976年 | 42篇 |
1975年 | 34篇 |
1974年 | 37篇 |
1973年 | 32篇 |
1968年 | 24篇 |
排序方式: 共有6000条查询结果,搜索用时 15 毫秒
1.
2.
Thomas Donohue Morton J. Kern Richard Bach Frank Aguirre Thomas Wolford 《Catheterization and cardiovascular interventions》1993,28(2):155-161
The vasomotor response of native human collateral vessels to pharmacologic or hemodynamic vasodilatory stimuli is not well known. We describe a case where retrograde collateral flow velocity was measured both at baseline and following selected hemodynamic and pharmacologic interventions. This index case represents the first in a series of potential human physiologic studies designed to address questions pertaining to control of collateral blood supply in humans. © 1993 Wiley-Liss, Inc. 相似文献
3.
4.
5.
6.
Leonidas JC; Berdon WE; Valderrama E; Neveling U; Schuval S; Weiss SJ; Hilfer C; Godine L 《Radiology》1996,198(2):377
7.
E Zuskin Z Zagar E N Schachter J Mustajbegovic J Kern 《British journal of industrial medicine》1992,49(6):435-440
A group of 59 workers (41 men and 18 women) employed in swine confinement areas was studied to assess the presence of acute and chronic respiratory symptoms and the prevalence of abnormalities in ventilatory function. A control group of 46 (31 men and 15 women) unexposed workers was studied for the prevalence of chronic respiratory symptoms. For both male and female swine confinement workers complaints of chronic cough, dyspnoea, and chest tightness were significantly more frequent than among control workers. Male workers also complained more of chronic phlegm. Male swine confinement workers who were smokers had significantly higher prevalences of chronic cough, chronic phlegm, and chronic bronchitis than male non-smoking swine confinement workers. The frequency of acute symptoms associated with the workshift was high among the swine confinement workers with more than half of the workers complaining of cough and dyspnoea associated with work. Significant acute across shift reductions in lung function occurred in swine confinement workers, being largest for FEF25. All Monday preshift ventilatory capacity measurements in male confinement workers were significantly lower than predicted values; FVC and FEV1 were found to be lower than predicted values for women. The data indicate that exposure in swine confinement buildings is associated with the development of acute and chronic respiratory symptoms and impairment of lung function. Smoking appears to aggravate these changes. 相似文献
8.
JC Sitek† M Loeb‡ JR Ronnevig¶ 《Journal of the European Academy of Dermatology and Venereology》2007,21(7):891-896
BACKGROUND: Since 1997, a number of trials have shown promising results in treating generalized vitiligo with narrowband ultraviolet B (UVB) both in adults and children. However, there is little knowledge concerning the duration and permanency of the treatment-induced repigmentation. OBJECTIVE: Our main objective was to perform a follow-up trial of successfully treated patients receiving narrowband UVB for generalized vitiligo. METHODS: We have investigated to what degree the treatment-induced repigmentation remains stable for up to 2 years post-treatment. We performed an initial open trial including 31 patients with generalized vitiligo. They received narrowband UVB thrice weekly for up to 12 months. Patients experiencing > 75% repigmentation were defined responders and were included in the follow-up trial. Responders were followed every 6 months for up to 2 years after cessation of treatment. We observed the pigmentation status and registered any changes indicating loss of pigmentation and relapse. RESULTS: Eleven of the 31 treated patients were included in the follow-up trial. Six patients had relapse and five patients had stable response 24 months after cessation of treatment. Four out of six relapses were within 6 months post-treatment. CONCLUSION: In our study population of 31 patients with generalized vitiligo, five patients (16%) experienced > 75% stable repigmentation 2 years after cessation of a treatment programme of up to 1 years narrowband UVB therapy. 相似文献
9.
Philippe Kern MD Albert-Adrien RameletMD Robert Wutschert MD Henri Bounameaux MD Daniel Hayoz MD 《Dermatologic surgery》2004,30(3):367-372
BACKGROUND: A single-blind, randomized, comparative study was performed to evaluate the efficacy of pure chromated glycerin (CG), polidocanol (POL) 0.25% solution, and POL 0.25% foam (Monfreux technique) for treatment of telangiectasias and reticular leg veins. OBJECTIVE: To determine the relative efficacy and safety of two sclerosing agents and foam. METHOD: Of 150 randomized patients presenting comparable areas (lateral face of thigh) of telangiectasias and reticular leg veins, 147 could be evaluated by photographic assessment, patients' satisfaction score, and pain at injection sites. Internal and external agreement for the photographic assessment was good for two independent blinded experts. RESULTS: CG cleared vessels significantly better than POL solution or foam (p<0.002). The patients' satisfaction score was also higher in the CG group, although the difference did not reach statistical significance. CG was significantly more painful at injection sites. Other side effects were very few, precluding any statistical comparison. Foam was associated with more side effects (microthrombi, matting) than CG or POL solution. Three patients treated with POL foam experienced a transient visual disturbance. CONCLUSION: This study shows that CG is superior to POL solution and foam for sclerotherapy of leg telangiectasias. 相似文献
10.
Ongoing pregnancies after intracytoplasmic injection using cryopreserved testicular spermatozoa 总被引:4,自引:2,他引:2
Perraguin-Jayot S; Audebert A; Emperaire JC; Parneix I 《Human reproduction (Oxford, England)》1997,12(12):2706-2709
We report two clinical pregnancies occurring after intracytoplasmic sperm
injection (ICSI) using cryopreserved spermatozoa obtained from testicular
biopsy, made in two different infertility situations in our clinic. The
first patient showed a secretory azoospermia associated with elevated serum
follicular stimulating hormone (FSH) level and spermiogenesis maturation
arrest. The second patient was affected by azoospermia resulting from
bilateral epididymal obstruction. Spermatozoa present in the wet
preparation of testicular biopsy made on the day of scrotal exploration
were cryopreserved within the testicular tissue for both men.
Intracytoplasmic injections were performed at a later date, using
spermatozoa prepared from frozen-thawed tissues. In each case, three
embryos were obtained and transferred in utero. The transfers resulted in a
twin pregnancy for the first case, and in a singleton pregnancy for the
second. Living foetuses were seen in the ultrasound scan at the 7th week
and both pregnancies are proceeding to date beyond 30 weeks without
complications.
相似文献