全文获取类型
收费全文 | 1434篇 |
免费 | 76篇 |
国内免费 | 56篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 88篇 |
妇产科学 | 31篇 |
基础医学 | 159篇 |
口腔科学 | 25篇 |
临床医学 | 174篇 |
内科学 | 305篇 |
皮肤病学 | 51篇 |
神经病学 | 63篇 |
特种医学 | 306篇 |
外科学 | 82篇 |
综合类 | 29篇 |
预防医学 | 107篇 |
眼科学 | 8篇 |
药学 | 71篇 |
中国医学 | 2篇 |
肿瘤学 | 64篇 |
出版年
2023年 | 6篇 |
2022年 | 4篇 |
2021年 | 13篇 |
2020年 | 12篇 |
2019年 | 10篇 |
2018年 | 21篇 |
2017年 | 9篇 |
2016年 | 10篇 |
2015年 | 15篇 |
2014年 | 19篇 |
2013年 | 48篇 |
2012年 | 32篇 |
2011年 | 33篇 |
2010年 | 46篇 |
2009年 | 67篇 |
2008年 | 37篇 |
2007年 | 85篇 |
2006年 | 39篇 |
2005年 | 33篇 |
2004年 | 25篇 |
2003年 | 27篇 |
2002年 | 37篇 |
2001年 | 31篇 |
2000年 | 24篇 |
1999年 | 29篇 |
1998年 | 72篇 |
1997年 | 82篇 |
1996年 | 103篇 |
1995年 | 63篇 |
1994年 | 58篇 |
1993年 | 54篇 |
1992年 | 20篇 |
1991年 | 15篇 |
1990年 | 25篇 |
1989年 | 43篇 |
1988年 | 39篇 |
1987年 | 39篇 |
1986年 | 50篇 |
1985年 | 45篇 |
1984年 | 10篇 |
1983年 | 15篇 |
1982年 | 15篇 |
1981年 | 10篇 |
1980年 | 13篇 |
1979年 | 13篇 |
1978年 | 14篇 |
1977年 | 10篇 |
1976年 | 14篇 |
1975年 | 15篇 |
1973年 | 4篇 |
排序方式: 共有1566条查询结果,搜索用时 34 毫秒
1.
2.
3.
4.
J K Friel S Penney D W Reid W L Andrews 《JPEN. Journal of parenteral and enteral nutrition》1988,12(4):382-386
To evaluate a pediatric trace element supplement (Ped-El, Pharmacia) 18 metabolic balance studies were completed in 13 infants (mean birth weight 909 +/- 67 g, x +/- SEM; mean gestational age 27.2 +/- 1 weeks) who received total parenteral nutrition. The supplement supplied 40 micrograms/kg/day of zinc resulting in negative retention of 226 micrograms/kg/day. Copper infused at 20 micrograms/kg/day led to a positive retention of 8 micrograms/kg/day and an increase in serum Cu (p less than 0.05) not related to Cu intakes. Manganese infused at 40 micrograms/kg/day was nearly all retained (88 +/- 16% retention). Iron infused at 120 micrograms/kg/day led to a positive retention of 93 micrograms/kg/day. Although plasma ferritin and percent transferrin saturation were elevated, only plasma Fe values were correlated with Fe intake. This trace element supplement does not appear suitable for very low birth weight preterm infants. 相似文献
5.
Leonidas JC; Berdon WE; Valderrama E; Neveling U; Schuval S; Weiss SJ; Hilfer C; Godine L 《Radiology》1996,198(2):377
6.
Serum prolactins in the diagnosis of epilepsy: sensitivity, specificity, and predictive value 总被引:8,自引:0,他引:8
Serum prolactin levels rise after generalized tonic-clonic and partial complex seizures, but not after pseudoepileptic seizures. The criteria for a significant elevation in serum prolactin vary with individual investigators. The prevalence of pseudoseizures in the population studied determines the predictive value of serum prolactin determinations. In populations where most patients have epilepsy, a rise in serum prolactin is highly predictive for true epilepsy, but no increase in serum prolactin is not predictive for pseudoseizures. 相似文献
7.
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
8.
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
9.
10.