全文获取类型
收费全文 | 1641篇 |
免费 | 108篇 |
国内免费 | 56篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 83篇 |
妇产科学 | 15篇 |
基础医学 | 194篇 |
口腔科学 | 34篇 |
临床医学 | 245篇 |
内科学 | 385篇 |
皮肤病学 | 62篇 |
神经病学 | 80篇 |
特种医学 | 313篇 |
外科学 | 100篇 |
综合类 | 28篇 |
预防医学 | 87篇 |
眼科学 | 13篇 |
药学 | 82篇 |
中国医学 | 3篇 |
肿瘤学 | 75篇 |
出版年
2023年 | 10篇 |
2022年 | 18篇 |
2021年 | 31篇 |
2020年 | 21篇 |
2019年 | 27篇 |
2018年 | 26篇 |
2017年 | 13篇 |
2016年 | 18篇 |
2015年 | 24篇 |
2014年 | 32篇 |
2013年 | 64篇 |
2012年 | 48篇 |
2011年 | 43篇 |
2010年 | 56篇 |
2009年 | 68篇 |
2008年 | 44篇 |
2007年 | 74篇 |
2006年 | 60篇 |
2005年 | 40篇 |
2004年 | 35篇 |
2003年 | 32篇 |
2002年 | 38篇 |
2001年 | 33篇 |
2000年 | 27篇 |
1999年 | 32篇 |
1998年 | 73篇 |
1997年 | 88篇 |
1996年 | 105篇 |
1995年 | 66篇 |
1994年 | 64篇 |
1993年 | 54篇 |
1992年 | 24篇 |
1991年 | 25篇 |
1990年 | 33篇 |
1989年 | 43篇 |
1988年 | 39篇 |
1987年 | 35篇 |
1986年 | 51篇 |
1985年 | 43篇 |
1984年 | 13篇 |
1983年 | 16篇 |
1982年 | 15篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 11篇 |
1978年 | 12篇 |
1977年 | 12篇 |
1976年 | 14篇 |
1975年 | 14篇 |
1973年 | 6篇 |
排序方式: 共有1805条查询结果,搜索用时 31 毫秒
1.
2.
3.
Victor M. Cardenas 《American journal of public health》2002,92(11):1706-1707
4.
5.
Leonidas JC; Berdon WE; Valderrama E; Neveling U; Schuval S; Weiss SJ; Hilfer C; Godine L 《Radiology》1996,198(2):377
6.
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
7.
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
8.
Recombinant erythropoietin improves exercise capacity in anemic hemodialysis patients 总被引:5,自引:0,他引:5
H T Robertson N R Haley M Guthrie D Cardenas J W Eschbach J W Adamson 《American journal of kidney diseases》1990,15(4):325-332
The objective of this study was to quantitate the improvement in exercise capacity produced in anemic chronic hemodialysis (HD) patients after correction of their anemia with recombinant human erythropoietin (rHuEPO). The maximal exercise capacity and quadriceps strength of 19 anemic HD patients was tested before and after correction of the anemia with rHuEPO. A progressive work exercise protocol (PWET) on a cycle ergometer was used to compare measurements of maximal oxygen uptake (VO2max), maximal heart rate, and subjective assessment of fatigue during the test. Measurements of quadriceps strength were performed before the cycle ergometer studies. At baseline, all patients had reduced VO2max (15.3 +/- 5.4 mL/kg/min) and maximal exercise heart rates (138.5 +/- 23.9 beats/min). rHuEPO increased the mean hematocrit from 21.2% to 35%, and this was associated with a 17% increase (P less than 0.0005) in the VO2max. At any specified work load, rHuEPO treatment decreased heart rate, minute ventilation, and the subjective perception of fatigue. Both isometric and isokinetic measurements of quadriceps strength were improved following administration of rHuEPO. The maximal exercise heart rate was decreased in comparison to the baseline measurements (P less than 0.04), suggesting that in contrast to normal subjects, HD patients stop exercise before oxygen transport limitations are reached. In this unselected group of chronic HD patients, rHuEPO produced clinically significant improvements in both aerobic exercise capacity and isometric and isokinetic quadriceps strength. The improvement in aerobic capacity was substantially less than would have been expected from the correction of a comparable degree of anemia in non-HD patients. None of the 19 treated patients attained the exercise performance level predicted for a sedentary normal subject. 相似文献
9.
10.