全文获取类型
收费全文 | 9311篇 |
免费 | 474篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 138篇 |
儿科学 | 147篇 |
妇产科学 | 79篇 |
基础医学 | 1295篇 |
口腔科学 | 209篇 |
临床医学 | 603篇 |
内科学 | 2287篇 |
皮肤病学 | 448篇 |
神经病学 | 411篇 |
特种医学 | 290篇 |
外科学 | 1967篇 |
综合类 | 38篇 |
预防医学 | 238篇 |
眼科学 | 75篇 |
药学 | 581篇 |
中国医学 | 12篇 |
肿瘤学 | 1034篇 |
出版年
2023年 | 49篇 |
2022年 | 132篇 |
2021年 | 203篇 |
2020年 | 115篇 |
2019年 | 139篇 |
2018年 | 210篇 |
2017年 | 149篇 |
2016年 | 166篇 |
2015年 | 208篇 |
2014年 | 256篇 |
2013年 | 279篇 |
2012年 | 494篇 |
2011年 | 532篇 |
2010年 | 288篇 |
2009年 | 257篇 |
2008年 | 433篇 |
2007年 | 471篇 |
2006年 | 474篇 |
2005年 | 475篇 |
2004年 | 474篇 |
2003年 | 496篇 |
2002年 | 483篇 |
2001年 | 214篇 |
2000年 | 243篇 |
1999年 | 240篇 |
1998年 | 124篇 |
1997年 | 102篇 |
1996年 | 93篇 |
1995年 | 87篇 |
1994年 | 86篇 |
1993年 | 65篇 |
1992年 | 147篇 |
1991年 | 152篇 |
1990年 | 126篇 |
1989年 | 127篇 |
1988年 | 145篇 |
1987年 | 131篇 |
1986年 | 135篇 |
1985年 | 120篇 |
1984年 | 80篇 |
1983年 | 84篇 |
1982年 | 39篇 |
1979年 | 54篇 |
1978年 | 35篇 |
1977年 | 38篇 |
1974年 | 37篇 |
1973年 | 39篇 |
1972年 | 39篇 |
1971年 | 41篇 |
1968年 | 37篇 |
排序方式: 共有9852条查询结果,搜索用时 18 毫秒
21.
K Naito H Hisazumi A Saka T Nakamura S Kanda I Mikawa S Ejiri T Miyagi T Katsumi K Kitagawa 《Hinyokika kiyo. Acta urologica Japonica》1990,36(4):487-494
To evaluate the effect of UFT, a mixture of ftorafur and uracil in a ratio of 1:4, in preventing postoperative recurrence of bladder cancer, we performed a randomized controlled study with a non-medication group as control. UFT was given orally 400 mg a day for 6 months. Of 111 patients, 56 were given UFT and 55 were followed up without any medication. The non-recurrence rate in the group treated with UFT was 62.8% after 1 year and 36.3% after 2 years of follow up, and that of the control group was 45.7% and 39.5%, respectively. The rate of non-recurrence in the UFT group was significantly higher (p less than 0.05) than that of the control group during the period of follow up for 2 years. The incidence of side effects was 6.8% in UFT patients. These results indicate the clinical usefulness of prophylactic administration of UFT for bladder cancer patients. 相似文献
22.
Roberto Civitelli M.D. Eturo Ogata Louis V. Avioli Gary Stein Samuel Edelstein John A. Eisman Yasuho Nishii Hajime Orimo Jane Lian Takuo Fujita Yasufumi Hayashi Shigeaki Kato Tadashi Kobayashi Hirotoshi Morii Rikushi Morita Toshitaka Nakamura Yoshiki Seino Masataka Shiraki Tatsuo Suda Naoyuki Takahashi Hideaki Takahashi Tastuhiko Tanisawa Akifumi Tokita 《Calcified tissue international》1995,57(6):409-414
23.
Shoji Matsushima Yuko Sakai Yoshiki Hira Masamichi Kato Tsukasa Shigemitsu Yoichi Shiga 《Journal of pineal research》1993,14(3):145-150
Abstract: Light microscopic observations on the superficial pineal gland of Wistar-King rats were made to examine whether or not pineal volume and pinealocyte size, expressed as nuclear density, at daytime or nighttime are affected by long-term exposure to 50 Hz rotating magnetic field (MF) at 5.0 μT. Determinations of pineal volume and pinealocyte size were repeated twice (April and October) during the year. Size of pinealocytes in MF-exposed and sham-exposed rats exhibited, in addition to the difference between peripheral and central regions, regional differences in a proximodistal direction; pinealocytes in the distal and middle-peripheral regions were usually larger than those in the proximal and middle-central regions at daytime or nighttime. In October, distal and proximal pinealocytes showed significant day-night changes in size in sham-exposed rats, but not in MF-exposed animals. The situations in the two groups were almost reversed in April. Significant day-night differences were scarcely found in pinealocyte size in the middle region in the two groups. Throughout the study, pineal volume and pinealocyte size in each region were generally the same between MF-exposed and sham-exposed rats at daytime or nighttime. The results suggest that pinealocytes in the distal and proximal regions, but not those in the middle region, are affected by MF-exposure; day-night differences in sizes of distal and proximal pinealocytes appear in April and disappear in October under the influence of MF. MF may exert an effect on mechanisms controlling day-night rhythms of pinealocyte size in the rat. 相似文献
24.
Kohji Matsushita Kazuo Kitagawa Tomohiro Matsuyama Toshiho Ohtsuki Akihiko Taguchi Kenji Mandai Takuma Mabuchi Yoshiki Yagita Takehiko Yanagihara Masayasu Matsumoto 《Brain research》1996,743(1-2)
The divalent cation zinc has been reported to possess several physiological properties such as blocking apoptotic cell death through an inhibitory effect on Ca2+-Mg2+ endonuclease activity, or modulating the neurotoxicity via glutamate receptor subtypes. In the present study, we investigated the effect of peripherally injected zinc on delayed neuronal death seen in the hippocampus after transient global ischemia, in order to elucidate a possible beneficial role on zinc in ischemic neuronal cell death. Forty-five adult Mongolian gerbils of both sexes underwent transient bilateral clipping of the common carotid arteries for 3 min. In the pretreated animals, ZnCl2 (20 mg/kg) was injected subcutaneously once, 1 h before ischemia (superacute group; n=6) or twice at 24 and 48 h before ischemia (subacute group; n=14). Histological survey was carried out 3 days later by in situ DNA fragmentation method and 4 days later by hematoxylin-eosin staining by semiquantatively counting dead neurons in the CA1 sector. Subacute zinc pre-administration significantly reduced the nuclear damage and subsequent neuronal death; however, superacutely pre-administered zinc did not protect hippocampal neurons against ischemia but it did not aggravate the effect of ischemia, either. The present study suggested that transfer of exogenous zinc into the intracellular space is required for neuroprotection, presumably via the anti-endonuclease activity. 相似文献
25.
Kiyoshi Nakatsuka Yoshiki Nishizawa Satoshi Hagiwara Hidenori Koyama Takami Miki Hironobu Ochi Hirotoshi Morii 《Calcified tissue international》1990,47(6):378-382
Summary Total body bone mineral (TBBM) content in rats was measured by dual photon absorptiometry (DPA). TBBM showed significant increases
over 4 weeks in control groups with significant bone loss over the same time in prednisolone-injected rats on low calcium
feed. Daily injections of calcitonin significantly reduced loss of bone mass. Both prednisolone- and prednisolone-calcitonin-injected
groups showed significantly elevated serum alkaline phosphatase with the prednisolone-calcitonin group also exhibiting elevated
serum calcium and phosphate levels, confirming the impact of the experimental protocol. TBBM measured by DPA in all groups
correlated well (r=0.928,P<0.001 n=20) with the total ash weight suggesting that the method reflects total skeletal mineral content in the small animal.
TBBM measurement by DPA proves well-suited to monitoring bone mineral in a small animal experimental setting. 相似文献
26.
Sadegh Salmassi M. Mitsuo Yokoyama MD John A. Maples and Yoshiki Matsui 《Vox sanguinis》1980,39(5):264-270
Abstract. Paraformaldehyde-fixed platelets from normal donors were used for detection of antibody to platelet by in vitro sensitization (indirect method) utilizing rabbit anti-human IgG heavy chain specific antibody-coated polyacrylamide gels (Immunobeads). The sensitized platelets formed rosettes with Immunobeads and the positive rosette count was over 30%, while control showed less than 8% when normal sera were used. This method was also applicable for detecting antibody-sensitized platelets in vivo (direct method) in patients with autoimmune thrombocytopenia. This method is simple, rapid and reproducible for clinical use. Direct and indirect immunofluorescent antibody tests and a blocking test with anti-human serum also supported the results of Immunobead rosetting technique. 相似文献
27.
Naoko Masuzawa Mitsuo Kishimoto Yoshiki Takahashi 《International journal of gynecological pathology》2003,22(3):285-288
A 57-year-old female presented with an abnormal Pap smear. Colposcopic examination of the cervix revealed white mucosa with erosion and several areas of black pigmentation. After a colposcopically directed biopsy and loop conization, radical hysterectomy and bilateral salpingo-oophorectomy with pelvic and paraaortic lymphadenectomy were performed. Pathological examination disclosed an invasive squamous cell carcinoma admixed with many dendritic melanocytes. Melanin granules were present within the melanocytes and tumor cells. Although similar tumors have been reported in other sites, this is the first report to our knowledge of a pigmented squamous cell carcinoma of the uterine cervix. 相似文献
28.
Attenuation of lung injury in allograft rejection using NF-kappaB decoy transfection-novel strategy for use in lung transplantation. 总被引:5,自引:0,他引:5
29.
Photoaging and oxidative stress 总被引:5,自引:0,他引:5
Chikako Nishigori† Yukari Hattori Yaeno Arima Yoshiki Miyachi 《Experimental dermatology》2003,12(S2):18-21
30.
International discussions concerning rhinomanometry have been held but no numerical comparisons have been reported. In an attempt to make international comparisons between different rhinomanometric results, nasal resistances were measured by active posterior rhinomanometry with a head-out body plethysmograph produced in Canada and by active posterior and anterior methods with a Japanese commercial rhinomanometer, and the results were compared. No significant differences were found between measurements obtained from the two types of equipment. It is believed that this study is the first project of international comparison of rhinomanometry. 相似文献