全文获取类型
收费全文 | 9368篇 |
免费 | 463篇 |
国内免费 | 63篇 |
专业分类
耳鼻咽喉 | 96篇 |
儿科学 | 151篇 |
妇产科学 | 46篇 |
基础医学 | 1135篇 |
口腔科学 | 233篇 |
临床医学 | 554篇 |
内科学 | 2388篇 |
皮肤病学 | 248篇 |
神经病学 | 848篇 |
特种医学 | 391篇 |
外科学 | 1578篇 |
综合类 | 27篇 |
一般理论 | 1篇 |
预防医学 | 211篇 |
眼科学 | 267篇 |
药学 | 577篇 |
中国医学 | 10篇 |
肿瘤学 | 1133篇 |
出版年
2023年 | 62篇 |
2022年 | 53篇 |
2021年 | 244篇 |
2020年 | 136篇 |
2019年 | 178篇 |
2018年 | 203篇 |
2017年 | 173篇 |
2016年 | 224篇 |
2015年 | 211篇 |
2014年 | 278篇 |
2013年 | 306篇 |
2012年 | 593篇 |
2011年 | 598篇 |
2010年 | 361篇 |
2009年 | 314篇 |
2008年 | 539篇 |
2007年 | 554篇 |
2006年 | 543篇 |
2005年 | 496篇 |
2004年 | 514篇 |
2003年 | 483篇 |
2002年 | 442篇 |
2001年 | 187篇 |
2000年 | 172篇 |
1999年 | 209篇 |
1998年 | 111篇 |
1997年 | 83篇 |
1996年 | 98篇 |
1995年 | 71篇 |
1994年 | 73篇 |
1993年 | 78篇 |
1992年 | 149篇 |
1991年 | 130篇 |
1990年 | 119篇 |
1989年 | 102篇 |
1988年 | 106篇 |
1987年 | 87篇 |
1986年 | 68篇 |
1985年 | 89篇 |
1984年 | 46篇 |
1983年 | 40篇 |
1982年 | 26篇 |
1979年 | 29篇 |
1978年 | 32篇 |
1975年 | 26篇 |
1974年 | 22篇 |
1972年 | 23篇 |
1969年 | 28篇 |
1968年 | 21篇 |
1967年 | 27篇 |
排序方式: 共有9894条查询结果,搜索用时 15 毫秒
1.
Hori Hiroki Ohta Asuka Matsui Honami Yano Kanako Morita-Tominaka Miyuki Linn Zayar Masumoto Daisuke Okumura Yosuke Okamura Satoshi Kurihara Kosuke Hayakawa Akira Rikiishi Takeshi Kobayashi Kyoko 《International journal of clinical oncology / Japan Society of Clinical Oncology》2022,27(1):245-252
International Journal of Clinical Oncology - The practice of cancer diagnosis disclosure to children has been changed with the times. The regulations of clinical trials in the 2000s might change... 相似文献
2.
Tasuku Ogita Rosaly Vallejo Manaois Manabu Wakagi Tomoyuki Oki Yuko Takano Ishikawa 《International journal of food sciences and nutrition》2016,67(4):431-440
Two cultivars of Japanese parsley were harvested in different seasons; their antioxidant capacities were evaluated by oxygen radical absorbance capacity (ORAC) methods, and the contents of hydrophilic and lipophilic antioxidants were compared. Japanese parsley possessed potent antioxidant capacities both in hydrophilic and lipophilic extracts when evaluated by ORAC methods. LC/MS/MS analyses revealed that chlorogenic acid and four kinds of quercetin glycosides were major antioxidants in the hydrophilic extract. Lutein was the main contributor to the antioxidant capacity of the lipophilic extract. Antioxidant capacities of the hydrophilic extracts of both cultivars tended to be higher in winter because of the increase in the contents of chlorogenic acid and quercetin glycosides. An obvious trend in the lipophilic antioxidant capacities or lutein contents was not observed irrespective of the cultivar. 相似文献
3.
4.
5.
Regional fractional ventilation mapping in spontaneously breathing mice using hyperpolarized 129Xe MRI 下载免费PDF全文
Hirohiko Imai Hironobu Matsumoto Erika Miyakoshi Shintaro Okumura Hideaki Fujiwara Atsuomi Kimura 《NMR in biomedicine》2015,28(1):24-29
The feasibility of ventilation imaging with hyperpolarized (HP) 129Xe MRI has been investigated for quantitative and regional assessment of ventilation in spontaneously breathing mice. The multiple breath ventilation imaging technique was modified to the protocol of spontaneous inhalation of HP 129Xe delivered continuously from a 129Xe polarizer. A series of 129Xe ventilation images was obtained by varying the number of breaths before the 129Xe lung imaging. The fractional ventilation, r, was successfully evaluated for spontaneously breathing mice. An attempt was made to detect ventilation dysfunction in the emphysematous mouse lung induced by intratracheal administration of porcine pancreatic elastase (PPE). As a result, the distribution of fractional ventilation could be visualized by the r map. Significant dysfunction of ventilation was quantitatively identified in the PPE‐treated group. The whole‐lung r value of 0.34 ± 0.01 for control mice (N = 4) was significantly reduced, to 0.25 ± 0.07, in PPE‐treated mice (N = 4) (p = 0.038). This study is the first application of multiple breath ventilation imaging to spontaneously breathing mice, and shows that this methodology is sensitive to differences in the pulmonary ventilation. This methodology is expected to improve simplicity as well as noninvasiveness when assessing regional ventilation in small rodents. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
6.
7.
8.
CROSSOVER COMPARISON BETWEEN THE DEPRESSOR EFFECTS OF LOW AND HIGH WORK-RATE EXERCISE IN MILD HYPERTENSION 总被引:2,自引:0,他引:2
Eiichiro Tashiro Shin-ichiro Miura Manabu Koga Manabu Sasaguri Munehito Ideishi Masaharu Ikeda Hiroaki Tanaka Munehiro Shindo Kikuo Arakawa 《Clinical and experimental pharmacology & physiology》1993,20(11):689-696
1. The relationship between work-rate and the antihypertensive effect of exercise in hypertensives, and the mechanism of that effect, were investigated by a crossover clinical trial. 2. Ten mild hypertensives were randomly divided into two groups. One group performed low work-rate exercise (LWE) on a cycle ergometer for 10 weeks (blood lactate threshold; ~50% of maximum oxygen consumption [V?O2max]). After a 10 week interval without exercise training, these subjects were then switched to a high work-rate exercise (HWE) regimen (4 mmol/ L of blood lactate; ~75% of V?O2max) for another 10 weeks. In the other group, the order of exercise training was reversed. Since two patients withdrew from the protocol during HWE periods, statistical analysis was performed on the data from the remaining eight patients. There were no order effects observed in any of the data from the two groups. 3. During both LWE and HWE, resting blood pressure (BP) fell significantly after the initiation of exercise therapy (P<0.05). Furthermore, the overall effects of 10 weeks of LWE and HWE on BP were not significantly different. 4. The work-rate at the lactate threshold, which reflects physical fitness, had increased significantly by 16 W (P<0.01) after the LWE period and by 11 W (P<0.01) after the HWE. 5. During the LWE period, changes in haemodynamic and humoral variables were not significant, except for a reduction in plasma norepinephrine at week 10 (P<0.05). In the HWE period, changes in haemodynamic and humoral variables were not significant. 6. Based on these findings, LWE is recommended for mild hypertensives because of its safety. 相似文献
9.
Akihiko Bo Shinichi Imura Hironori Omori Yasuhiro Okumura Masao Ando Hisatoshi Baba Patrick White Al Zarnowski 《Journal of orthopaedic science》1997,2(5):301-312
The fit and fill of the femoral canal are critical to the success of cementless femoral stems in total hip arthroplasty. It
is difficult for conventional stems to provide a good fit and fill for the femora of patients with secondary osteoarthritis.
Based on measurements of 100 femora of these patients, we designed two types of Fukui Medical School (FMS) stems with a proximal
lateral flare that differed in the medial radius. We compared the fit and fill of the FMS stems with those of four conventional
stems, using computer simulation. The mean proximal fit and total fit of the FMS stems were 46% and 53% respectively, a significant
improvement compared with the other stems examined. The mean fill of FMS stems was 82% at the lower end of the lesser trochanter
and 84% at the upper end of the isthmus, values that were significantly higher than those of the other stems. Since September
1995, we have implanted FMS stems in 15 hips with secondary osteoarthritis. Radiographic evaluations showed that the canal
fill of the FMS stems was significantly greater in the proximal femur compared with other stems previously inserted at our
department.
A summary of this paper was presented at the 9th Symposium on Computer-Assisted Radiology; June 1995, Berlin, and at the 8th
International Symposium on Technology in Arthroplasty; September 1995, Puerto Rico. 相似文献
10.