全文获取类型
收费全文 | 191396篇 |
免费 | 1974篇 |
国内免费 | 141篇 |
专业分类
耳鼻咽喉 | 1229篇 |
儿科学 | 7086篇 |
妇产科学 | 3350篇 |
基础医学 | 19133篇 |
口腔科学 | 1877篇 |
临床医学 | 13660篇 |
内科学 | 34896篇 |
皮肤病学 | 953篇 |
神经病学 | 18033篇 |
特种医学 | 9271篇 |
外科学 | 29923篇 |
综合类 | 2352篇 |
一般理论 | 5篇 |
预防医学 | 19344篇 |
眼科学 | 2917篇 |
药学 | 10676篇 |
中国医学 | 684篇 |
肿瘤学 | 18122篇 |
出版年
2024年 | 25篇 |
2023年 | 193篇 |
2022年 | 387篇 |
2021年 | 661篇 |
2020年 | 396篇 |
2019年 | 551篇 |
2018年 | 22387篇 |
2017年 | 17749篇 |
2016年 | 19941篇 |
2015年 | 1465篇 |
2014年 | 1506篇 |
2013年 | 1714篇 |
2012年 | 8459篇 |
2011年 | 22444篇 |
2010年 | 19573篇 |
2009年 | 12215篇 |
2008年 | 20650篇 |
2007年 | 22762篇 |
2006年 | 1604篇 |
2005年 | 3073篇 |
2004年 | 4194篇 |
2003年 | 5023篇 |
2002年 | 3074篇 |
2001年 | 349篇 |
2000年 | 450篇 |
1999年 | 249篇 |
1998年 | 313篇 |
1997年 | 295篇 |
1996年 | 175篇 |
1995年 | 145篇 |
1994年 | 136篇 |
1993年 | 105篇 |
1992年 | 64篇 |
1991年 | 107篇 |
1990年 | 147篇 |
1989年 | 83篇 |
1988年 | 66篇 |
1987年 | 56篇 |
1986年 | 32篇 |
1985年 | 43篇 |
1984年 | 36篇 |
1983年 | 32篇 |
1982年 | 37篇 |
1980年 | 48篇 |
1974年 | 25篇 |
1938年 | 60篇 |
1937年 | 25篇 |
1934年 | 30篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
This study investigates whether tissue recoil or patient intrinsic factors influence the final position of the nipple areola
complex (NAC) after reduction mammoplasty.
The age, pre-operative ptosis, BMI and weight of the tissue resected were recorded as patient intrinsic factors in 37 patients
undergoing reduction mammoplasty. The “spring-back” value was defined as the distance from the sternal notch to a nipple landmark
on the breast meridian with the patient sitting up, minus the same measurement repeated with the patient recumbent to eliminate
the pull of gravity on the breast. Spring back was measured pre-operatively for the nipple and nipple mark then post-operative
for the nipple. The difference in centimeters between the final post-operative distance from the sternal notch to the nipple
and the level intended by the pre-operative nipple mark was termed the “judgment error.” The final position of the post-operative
nipple and the judgment error was compared to the spring-back values and patient intrinsic factors.
Pre-operative ptosis was statistically related to increasing patient BMI and mass of tissue resected per breast. Pre-operative
spring-back values for the nipple increased with increasing ptosis, BMI and decreasing age. Spring-back values were greater
in the lower pole of the breast than in the upper pole. The final position of the nipple was higher than the pre-operative
mark in 65% of cases, lower in 8% and as marked in 27% of cases. The post-operative NAC was, on average, 0.6 cm higher than
planned pre-operatively. The post-operative distance from the sternal notch to the nipple increased with increasing pre-operative
ptosis, mass of breast tissue resected per breast and all three spring-back values. The difference between the level of the
pre-operative mark and the final nipple position showed a weak correlation with post-operative spring-back values.
The parameters of ptosis, BMI, weight of tissue resected per breast and pre-operative nipple spring back reflect body habitus
and breast size. Spring-back values vary between the upper and lower pole of the breast. The final NAC position was higher
than that intended at pre-operative marking in the majority of cases. The surgeon instinctively marks the nipple lower in
patients with greater pre-operative ptosis and in whom a larger resection is anticipated. Judgment error did not relate to
intrinsic factors nor to pre-operative spring-back values; hence, these parameters cannot be applied as predictive tools for
more accurate pre-operative marking of the nipple position. This study suggests that the pre-operative nipple mark should
be placed, with the patient sitting up, at least 23 cm from the sternal notch and 0.6 cm lower than the final position estimated
using the inframammary crease as a landmark.
An invited commentary on this paper is available at . 相似文献
32.
33.
Jamshid Shirani Jagat Narula William C. Eckelman Navneet Narula Vasken Dilsizian 《Journal of nuclear cardiology》2007,14(1):100-110
Conclusions Noninvasive imaging of neurohumoral upregulation in remodeled myocardium suggests that an imaging strategy can be developed
for predicting the rate of remodeling and likelihood of HF development. This should allow a more judicious use of neurohumoral
antagonists especially in subjects who do not have manifest HF.74 In others specific targeted imaging may allow timely selection of individualized treatment strategies and ensure optimization
of therapeutic intervention. Similar to ACE and AII receptors, multiple other targets in the hormonal cascades can identify
the likelihood of adverse and favorable remodeling.74 相似文献
34.
35.
Volker Heinemann 《Breast cancer research and treatment》2003,81(1):43-48
Single-agent chemotherapy of metastatic breast cancer is the treatment of choice in patients with slow tumor progression and asymptomatic disease. In this patient group, the choice of drugs is based more on good tolerability than on efficacy. By contrast, symptomatic or rapidly progressing disease requires the use of highly active regimens where more weight is put on reliable antitumor activity. While anthraycline-based combination regimens have set the standard of effective treatment, the addition of docetaxel (and to a lesser extent paclitaxel) has improved tumor response, but failed to induce a consistent prolongation of survival. Based on retrospective analyses, it is hypothesised that the combined use of anthracyclines and taxanes in first-line therapy may be most beneficial in defined subgroups: after adjuvant chemotherapy, in patients with HER-2 gene amplification, possibly also in patients with rapidly progressing visceral disease. 相似文献
36.
37.
38.
Antegrade interlocking nailing of humeral shaft fractures 总被引:5,自引:0,他引:5
George Petsatodes Dimitrios Karataglis Pericles Papadopoulos John Christoforides John Gigis John Pournaras 《Journal of orthopaedic science》2004,9(3):247-252
The results of 39 humeral shaft fractures (37 patients) treated with antegrade locked nailing using a Russell–Taylor nail were reviewed. There were 30 acute fractures, 6 fractures malaligned in a hanging cast or brace, and 3 pathological fractures. Patient age ranged from 26 to 80 years (average, 59.7 years) and average follow-up was 25.7 months (range, 6–48 months). Fracture union was achieved in 92.3% of our cases, while shoulder function was excellent or good in 87.2% of cases. Antegrade locked nailing offers a dependable solution for the treatment of humeral shaft fractures, especially in polytrauma patients and cases of segmental or pathological fractures. Far less satisfactory results were obtained in comminuted fractures of the proximal third in the humerus, especially in osteoporotic patients, and we therefore advocate caution with the use of intramedullary nailing in this type of fracture. Certain technical aspects such as avoiding nailing the fracture in distraction, properly countersinking the tip of the nail, and achieving adequate fixation stability have been found to be of paramount importance to reduce the incidence of delayed union/non-union rate and to obtain better functional results from the shoulder joint. 相似文献
39.
40.
Daniel M. Herron 《Journal of gastrointestinal surgery》2004,8(4):406-407
Conclusion In the year 2003 there is no “one best bariatric operation” for every severely obese patient. The choice of operation must
be tailored to each individual patient’s needs and wishes. For the superobese patient, the patient diagnosed with intestinal
metaplasia of the stomach, and for those patients who do not wish to undergo the severe dietary restrictions imposed by the
RNY-GB, the BPD-DS is a valuable surgical option. 相似文献