全文获取类型
收费全文 | 12743篇 |
免费 | 973篇 |
国内免费 | 57篇 |
专业分类
耳鼻咽喉 | 82篇 |
儿科学 | 406篇 |
妇产科学 | 187篇 |
基础医学 | 1711篇 |
口腔科学 | 247篇 |
临床医学 | 1219篇 |
内科学 | 2974篇 |
皮肤病学 | 132篇 |
神经病学 | 1099篇 |
特种医学 | 475篇 |
外科学 | 2033篇 |
综合类 | 180篇 |
一般理论 | 10篇 |
预防医学 | 953篇 |
眼科学 | 509篇 |
药学 | 761篇 |
中国医学 | 45篇 |
肿瘤学 | 750篇 |
出版年
2023年 | 66篇 |
2022年 | 83篇 |
2021年 | 186篇 |
2020年 | 103篇 |
2019年 | 190篇 |
2018年 | 192篇 |
2017年 | 136篇 |
2016年 | 159篇 |
2015年 | 192篇 |
2014年 | 295篇 |
2013年 | 532篇 |
2012年 | 734篇 |
2011年 | 808篇 |
2010年 | 441篇 |
2009年 | 438篇 |
2008年 | 673篇 |
2007年 | 768篇 |
2006年 | 756篇 |
2005年 | 779篇 |
2004年 | 738篇 |
2003年 | 741篇 |
2002年 | 740篇 |
2001年 | 120篇 |
2000年 | 122篇 |
1999年 | 132篇 |
1998年 | 173篇 |
1997年 | 140篇 |
1996年 | 134篇 |
1995年 | 119篇 |
1994年 | 105篇 |
1993年 | 102篇 |
1992年 | 108篇 |
1991年 | 81篇 |
1990年 | 67篇 |
1989年 | 77篇 |
1988年 | 65篇 |
1987年 | 73篇 |
1985年 | 74篇 |
1984年 | 90篇 |
1983年 | 88篇 |
1982年 | 128篇 |
1981年 | 121篇 |
1980年 | 93篇 |
1979年 | 65篇 |
1978年 | 79篇 |
1977年 | 81篇 |
1976年 | 64篇 |
1975年 | 70篇 |
1974年 | 67篇 |
1973年 | 62篇 |
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
51.
Alberto Salinas M.D. Harry M. Salinas B.Sc. Edwin Santiago Ph.D. Wilfredo García M.D. Queta Ferro R.D. Mariemma Antor M.Sc. 《Surgery for obesity and related diseases》2009,5(4):455-458
BackgroundSilastic ring vertical gastric bypass (SRVGB) with jejunal interposition is our standard operation for morbidly obese patients. We present the results of 5 years of follow-up in a cohort of patients who underwent SRVGB in 2001.MethodsThe records of all 160 consecutive patients who underwent SRVGB from January to December 2001 were reviewed. Of the 160 procedures, 143 were primary open cases, 14 were revisions from restrictive procedures, and 3 were laparoscopic cases. At 5 years, the body mass index and percentage of excess weight loss was available for 133 patients (83%) at office visits (n = 91, 68.4%), by telephone (n = 40, 30.1%), or by e-mail (n = 2, 1.5%).ResultsOf the 160 patients, 121 were women and 39 were men, with a mean age of 33.15 ± 10.0 years, percentage of ideal body weight of 195.7% ± 40.8%, and body mass index of 44.6 ± 9.3 kg/m2. The mean hospital stay was 3 ± 1 days. One patient (.6%) died of a pulmonary embolus. Early complications included 3 cases (1.87%) of upper gastrointestinal bleeding and 4 gastric leaks (2.5%): 2 (1.36%) from primary cases and 2 (14.29%) from revisional cases. Late complications included 32 patients (20%) with incisional hernias, 20 (12.5%) with anemia, 14 (8.8%) with dumping, 4 (2.5%) with gastrojejunal stricture, 2 (1.25%) with intestinal obstruction, and 2 (1.25%) requiring silastic ring surgical removal. The 5-year follow-up data were available for 133 patients (83%). The mean body mass index in this group was 27 ± 5 kg/m2, with a percentage of excess weight loss of 83% ± 18.3% at 5 years postoperatively.ConclusionThe results of our study have shown that SRVGB is an effective operation for promoting lasting weight loss, with acceptable mortality and complication rates. 相似文献
52.
53.
Frank Baker Ph.D. David Jodrey Ph.D. James Intagliata Ph.D. Harry Straus Ph.D. 《Community mental health journal》1993,29(4):321-331
A cohort of 729 chronically mentally ill patients receiving community support services (CSS) were followed over a nine-month period. Receiving needed community support services was shown to predict change in client functioning as measured by the Global Assessment Scale (GAS) even after the initial values on the GAS, as well as demographic, psychiatric, residential and medication maintenance variables were considered. Adequacy of social support from family, friends and others also contributed to predicting change in global functioning of the CSS patients.Johns Hopkins UniversityPresented at the American Psychological Association Annual Meeting, Washington, D.C., August 16, 1992. 相似文献
54.
55.
T L Yarboro B Harry E Hough K Moyers T Muscarella 《Journal of the National Medical Association》1991,83(5):409-414
Perhaps the most significant link in achieving the nation's immunization objectives is the extent of parental knowledge. Admittedly, this is a weak link. The 1990 federal objectives calling for an official format using common guidelines for completion of immunizations, though well-conceived, has not been used exclusively by health care givers. The lack of accord has permitted the proliferation of many different immunization records that are not only confusing to parents, but also to health care providers at times. A standard national immunization record could be an essential element in strengthening the weak link of parental knowledge of immunizations and stressing the importance of preserving such a record for a lifetime. 相似文献
56.
Eishi Asano Temenuzhka Mihaylova Csaba Juhász Sandeep Sood Harry T Chugani 《Clinical neurophysiology》2007,118(6):1360-1368
OBJECTIVE: To determine how sleep with central spindles alters the spatial distribution of interictal spike frequency in children with intractable focal seizures, and whether such children have spindles arising from the medial temporal region in addition to the frontal-central region. METHODS: Seventeen children (age: 7 months-17 years) were studied using extraoperative electrocorticography (ECoG). RESULTS: Overall spike frequency across the subdural electrodes was greater during sleep with central spindles compared to wakefulness. In 13 children showing at least 1 spike/min in an electrode, the spatial distribution of spike frequency was similar during wakefulness and sleep; in addition, the spike frequency was greater in the seizure onset zones compared to the non-onset areas, regardless of wakefulness or sleep. Spindles were identified in the medial temporal region during sleep with central spindles in all 17 children. CONCLUSION: Overall spike frequency may be increased by sleep with spindles, but the spatial distribution of spike frequency appears similar during wakefulness and sleep in children with intractable focal seizures. SIGNIFICANCE: Both awake and sleep ECoG may be useful to predict seizure onset zones in children with intractable focal epilepsy. Medial temporal spindles are present in some children with focal epilepsy. 相似文献
57.
58.
Andreas Machner Harry Merk Roland Becker Kerstin Rohkohl Heiko Wissel G za Pap 《Acta orthopaedica》2003,74(1):85-88
A proprioceptive deficit is an important determinant of disability in various shoulder disorders, such as instability and osteoarthrosis. In 15 patients with impingement syndrome stage II (Neer 1983), who were treated by arthroscopic subacromial decompression, we measured movement sense by determining threshold levels for the perception of motion of the shoulder. The patients were placed in a specially designed chair allowing continuous passive motion of the shoulder joint, while avoiding cutaneous, auditory and visual stimuli. To assess movement detection thresholds, passive abduction movements of the shoulder were performed at a starting angle of 60°, an amplitude of 10° and an angular velocity of 1.3°/s. Before surgery, all patients had higher threshold levels for the perception of motion in their affected shoulders then in the other side. After decompression, proprioception had improved on the decompressed side, but was unchanged on the other side. 相似文献
59.
60.
Michael C Graves Milan Fiala Lu Anne V Dinglasan Nancy Q Liu James Sayre Francesco Chiappelli Cees van Kooten Harry V Vinters 《Amyotrophic lateral sclerosis and other motor neuron disorders》2004,5(4):213-219
Recent studies have shown inflammatory markers in affected neural tissues of amyotrophic lateral sclerosis (ALS) patients. We examined immunocytochemically spinal cord tissues of six patients with ALS, two with corticospinal tract degeneration secondary to cerebral infarcts and three control subjects without neuropathologic abnormalities. ALS spinal cords had dense macrophage infiltration (one log greater than control spinal cords) involving the white and gray matter, with heaviest infiltration of lateral and ventral columns and, in one patient, prefrontal gyrus and the occipital lobes of the brain. Macrophages in ALS spinal cord showed strong expression of cyclooxygenase-2 (COX-2) (one log greater than control tissues) and inducible nitric oxide synthase. In the gray matter, macrophages surrounded and appeared to phagocytize neurons (NeuN-positive) that appeared to be dying. Vessels showed damage to the tight junction protein ZO-1 in relation to perivascular CD40 receptor-positive macrophages and CD40 ligand-positive T lymphocytes. ALS spinal cords, but not control cords, were sparsely infiltrated with mast cells. In control cases with corticospinal tract degeneration following hemispheric cerebral infarction, macrophage infiltration of the white matter was COX-2-negative and restricted to lateral and anterior corticospinal tracts. Our data suggest that inflammation in ALS spinal cord and cortex is based on innate immune responses by macrophages and mast cells and adaptive immune responses by T cells. 相似文献