全文获取类型
收费全文 | 3539篇 |
免费 | 176篇 |
国内免费 | 72篇 |
专业分类
耳鼻咽喉 | 40篇 |
儿科学 | 137篇 |
妇产科学 | 55篇 |
基础医学 | 482篇 |
口腔科学 | 177篇 |
临床医学 | 355篇 |
内科学 | 731篇 |
皮肤病学 | 78篇 |
神经病学 | 298篇 |
特种医学 | 343篇 |
外科学 | 209篇 |
综合类 | 33篇 |
一般理论 | 1篇 |
预防医学 | 376篇 |
眼科学 | 51篇 |
药学 | 279篇 |
中国医学 | 29篇 |
肿瘤学 | 113篇 |
出版年
2022年 | 32篇 |
2021年 | 63篇 |
2020年 | 51篇 |
2019年 | 73篇 |
2018年 | 84篇 |
2017年 | 49篇 |
2016年 | 57篇 |
2015年 | 65篇 |
2014年 | 95篇 |
2013年 | 154篇 |
2012年 | 190篇 |
2011年 | 196篇 |
2010年 | 147篇 |
2009年 | 147篇 |
2008年 | 159篇 |
2007年 | 203篇 |
2006年 | 136篇 |
2005年 | 135篇 |
2004年 | 108篇 |
2003年 | 108篇 |
2002年 | 90篇 |
2001年 | 70篇 |
2000年 | 71篇 |
1999年 | 60篇 |
1998年 | 80篇 |
1997年 | 89篇 |
1996年 | 107篇 |
1995年 | 68篇 |
1994年 | 65篇 |
1993年 | 58篇 |
1992年 | 42篇 |
1991年 | 35篇 |
1990年 | 53篇 |
1989年 | 56篇 |
1988年 | 60篇 |
1987年 | 47篇 |
1986年 | 63篇 |
1985年 | 61篇 |
1984年 | 23篇 |
1983年 | 28篇 |
1982年 | 25篇 |
1980年 | 18篇 |
1979年 | 29篇 |
1978年 | 26篇 |
1977年 | 23篇 |
1976年 | 23篇 |
1975年 | 20篇 |
1974年 | 14篇 |
1969年 | 18篇 |
1968年 | 17篇 |
排序方式: 共有3787条查询结果,搜索用时 78 毫秒
1.
Selwyn Arlington Headley Nayara Emily Viana Mariana de Mello Zanim Michelazzo Ana Aparecida Correa Xavier Cícero Júlio Silva Costa Felipe Hideki Ogo de Pinho Marcelo Diniz dos Santos 《Transboundary and Emerging Diseases》2020,67(Z2):49-59
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2. 相似文献
2.
3.
4.
5.
Leonidas JC; Berdon WE; Valderrama E; Neveling U; Schuval S; Weiss SJ; Hilfer C; Godine L 《Radiology》1996,198(2):377
6.
The laryngeal mask in failed intubation 总被引:1,自引:0,他引:1
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.