全文获取类型
收费全文 | 3929532篇 |
免费 | 293093篇 |
国内免费 | 6743篇 |
专业分类
耳鼻咽喉 | 56435篇 |
儿科学 | 124461篇 |
妇产科学 | 105522篇 |
基础医学 | 565096篇 |
口腔科学 | 112363篇 |
临床医学 | 361098篇 |
内科学 | 750607篇 |
皮肤病学 | 83421篇 |
神经病学 | 319411篇 |
特种医学 | 151304篇 |
外国民族医学 | 1277篇 |
外科学 | 590289篇 |
综合类 | 89533篇 |
现状与发展 | 13篇 |
一般理论 | 1601篇 |
预防医学 | 317300篇 |
眼科学 | 93796篇 |
药学 | 294064篇 |
14篇 | |
中国医学 | 7545篇 |
肿瘤学 | 204218篇 |
出版年
2018年 | 42151篇 |
2017年 | 31979篇 |
2016年 | 35678篇 |
2015年 | 40296篇 |
2014年 | 57637篇 |
2013年 | 87685篇 |
2012年 | 119236篇 |
2011年 | 126767篇 |
2010年 | 75401篇 |
2009年 | 71365篇 |
2008年 | 119349篇 |
2007年 | 127158篇 |
2006年 | 128371篇 |
2005年 | 124771篇 |
2004年 | 120035篇 |
2003年 | 115494篇 |
2002年 | 113125篇 |
2001年 | 175006篇 |
2000年 | 180520篇 |
1999年 | 152750篇 |
1998年 | 45572篇 |
1997年 | 40420篇 |
1996年 | 40004篇 |
1995年 | 38313篇 |
1994年 | 35716篇 |
1993年 | 33533篇 |
1992年 | 121564篇 |
1991年 | 118592篇 |
1990年 | 115259篇 |
1989年 | 111028篇 |
1988年 | 102907篇 |
1987年 | 101056篇 |
1986年 | 95408篇 |
1985年 | 91682篇 |
1984年 | 69236篇 |
1983年 | 59070篇 |
1982年 | 35782篇 |
1981年 | 32029篇 |
1979年 | 64950篇 |
1978年 | 46065篇 |
1977年 | 38657篇 |
1976年 | 36861篇 |
1975年 | 39071篇 |
1974年 | 47643篇 |
1973年 | 45355篇 |
1972年 | 42864篇 |
1971年 | 40110篇 |
1970年 | 37345篇 |
1969年 | 35143篇 |
1968年 | 32280篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
952.
H J Keene 《Journal of dental research》1986,65(6):935-938
We examined the skeletal remains of 1338 early Hawaiians (preserved in the Bishop Museum, Honolulu) to determine total caries and root surface caries prevalence. Specimens from seven islands were represented in the collection. Estimation of age at death was made by a combination of dental developmental staging for younger individuals and occlusal attrition and/or alveolar bone loss in adults. Museum records were also consulted for age estimation of adults which was primarily based on osteological criteria. The material was divided into six age groups. Predentate infants and edentulous adults were not included. A total of 19,425 teeth was examined. Caries lesions were observed in 462 individuals (34.5%) and 1895 teeth (9.8%). Coronal caries lesions in children and adolescents tended to be small and not particularly destructive of tooth structure. Root surface lesions in young adults were also small but increased progressively in size in the older groups, resulting in pulp exposure and coronal amputation. Although coronal caries was apparently not a significant dental health problem in children and young adults (compared with contemporary Hawaiians), root surface caries was an increasingly important source of tooth morbidity and tooth mortality in the older population groups. This age-related caries pattern was similar for all of the islands. 相似文献
953.
H Atlan R Sigal H Hadar R Chisin I Cohen A Lanir M Soudry Y Machtey R Schreiber J Benmair 《Journal of nuclear medicine》1986,27(2):207-215
Thirty-two patients with diversified pathology were examined with a supraconductive NMR imager using spin echo with different TR and TE to obtain T1 and T2 weighted images. They included 20 tumors (12 primary, eight metastasis), six osteomyelitis, three fractures, two osteonecrosis, and one diffuse metabolic (Gaucher) disease. In all cases except for the stress fractures, the bone pathology was clearly visualized in spite of the normal lack of signal from the compact cortical bone. Nuclear magnetic resonance (NMR) imaging proved to be at least as sensitive as radionuclide scintigraphy but much more accurate than all other imaging procedures including computed tomography (CT) and angiography to assess the extension of the lesions, especially in tumors extended to soft tissue. This is due both to easy acquisition of sagittal and coronal sections and to different patterns of pathologic modifications of T1 and T2 which are beginning to be defined. It is hoped that more experience in clinical use of these patterns will help to discriminate between tumor extension and soft-tissue edema. We conclude that while radionuclide scintigraphy will probably remain the most sensitive and easy to perform screening test for bone pathology, NMR imaging, among noninvasive diagnostic procedures, appears to be at least as specific as CT. In addition, where the extension of the lesions is concerned, NMR imaging is much more informative than CT. In pathology of the spine, the easy visualization of the spinal cord should decrease the need for myelography. 相似文献
954.
Metoclopramide, a substituted benzamide derivative, was orally administered to a patient with intractable hiccups. Dysphoria, akathisia, depressed mood with suicidal ideation, insomnia, racing thoughts, and labile affect were seen following the administration of metoclopramide. The episode met criteria for an organic affective syndrome. It is suggested that the mental status of patients undergoing metoclopramide therapy be monitored, since these symptoms have not been previously reported. 相似文献
955.
Horner's syndrome or oculosympathetic paralysis is not an uncommon finding in patients with head and neck neoplasms. While in most cases the syndrome is easily established at the bedside, it can be confirmed and topographically defined as a central, preganglionic, or postganglionic lesion through sequential pharmacologic testing. The importance of such localization lies in differentiating neoplasia vs. a benign condition as the cause of the syndrome. Such variants as congenital Horner's, an alternating Horner's, and a pseudo-Horner's syndrome are discussed in regard to their differential features. 相似文献
956.
Diaper area skin microflora of normal children and children with atopic dermatitis. 总被引:1,自引:1,他引:0 下载免费PDF全文
In vitro studies established that neither cloth nor disposable diapers demonstrably contributed to the growth of Escherichia coli, Proteus vulgaris, Staphylococcus aureus, or Candida albicans when urine was present as a growth medium. In a clinical study of 166 children, the microbial skin flora of children with atopic dermatitis was compared with the flora of children with normal skin to determine the influence of diaper type. No biologically significant differences were detected between groups wearing disposable or cloth diapers in terms of frequency of isolation or log mean recovery of selected skin flora. Repeated isolation of S. aureus correlated with atopic dermatitis. The log mean recovery of S. aureus was higher in the atopic groups. The effects of each diaper type on skin microflora were equivalent in the normal and atopic populations. 相似文献
957.
A. Jaén J. Sunyer X. Basagaña S. Chinn† J. P. Zock J. M. Antó‡ P. Burney† 《Clinical and experimental allergy》2002,32(12):1713-1719
BACKGROUND: The role of atopy in the evolution to chronic obstructive disease remains controversial. AIM: We aimed to assess the association between individual sensitization to common allergens and lung function. METHOD: We analysed data from 12,687 subjects aged 20 to 44 years, from 34 centres in 15 countries participating in the European Community Respiratory Health Survey (ECRHS). Participants performed a blood test, lung function test, methacholine challenge, and answered an administered questionnaire. The relationships between specific IgE, FEV1 and FEV1/FVC ratio were assessed for each study centre stratified by sex, followed by random effects meta-analysis. RESULTS: Asthmatics sensitized to house dust mite had a lower FEV1 (-119 mL in women and -112 mL in men) and FEV1/FVC ratio (-1.95%, and -2.48%) than asthmatics without sensitization. Asthmatics sensitized to cat had a lower FEV1 (statistically significant for women only) and a lower FEV1/FVC ratio. Asthmatic women sensitized to grass had a lower FEV1 and a lower ratio, and those sensitized to Cladosporium had a lower FEV1. A weak association was found with sensitization to cat and to Cladosporium among non-asthmatic women, which disappeared after adjusting for BHR. CONCLUSION: We conclude that atopy was related to a lower lung function, which was only apparent among asthmatics. This relationship was explained by specific sensitization to cat and to house dust mite, the latter being homogeneous across areas. 相似文献
958.
Bone mineral density testing in healthy postmenopausal women. The role of clinical risk factor assessment in determining fracture risk. 总被引:5,自引:0,他引:5
William D Leslie Colleen Metge Elizabeth A Salamon C Kin Yuen 《Journal of clinical densitometry》2002,5(2):117-130
The ease of measurement and the quantitative nature of bone mineral densitometry (BMD) is clinically appealing. Despite BMD's proven capability to stratify fracture risk, data indicate that clinical risk factors provide complementary information on fracture susceptibility that is independent of BMD. Methods to quantify fracture risk using both clinical and BMD variables would have great appeal for clinical decision-making. We describe a procedure for quantifying hip fracture risk (5-yr and remaining lifetime) based on (1) the individual's age alone (base model, assuming average clinical risk factors and bone density), (2) incorporation of multiple patient-specific clinical risk factor data in the base model, and (3) incorporation of both patient-specific clinical risk factor data and BMD results. 相似文献
959.
Comparison of local and general anesthesia in tension-free (Lichtenstein) hernioplasty: a prospective randomized trial 总被引:3,自引:0,他引:3
To compare pulmonary effects, postoperative pain and fatigue, morbidity, patient satisfaction, and cost of different anesthetic
techniques for inguinal hernia repair, 50 patients were randomized to local and general anesthesia groups (LA and GA). All
patients received the same premedications and the same postoperative analgesic regimen. The standardized postoperative analgesic,
intramuscular pyroxicam 20 mg, was given to all patients in the recovery room and an additional 20 mg on the same day was
given as requested by each patient. Pulmonary function studies and arterial blood gas analysis were performed 1 h prior to
the operation and at the postoperative 8th and 24th hours. All patients underwent Lichtenstein's tension-free hernioplasty.
Postoperative pain and fatigue were registered 8 h and 24 h after the operation. A questionnaire was filled out by the patients,
and they were asked to give grades for the general comfort of the anesthesia and the surgical procedure (1=worst, 10=best).
Postoperative pulmonary function tests were significantly poorer in the GA group both on 8th- and 24th-hour measurements (P<0.05). Patients who underwent LA had significantly lower PCO2 and higher PO2 at the postoperative 8th hour (P<0.05). Mean postoperative pain and fatigue scores revealed a significant difference in favor of local anesthesia at only
the 8th hour (P<0.05). There were two complications, one in each group (a hematoma in LA and a urinary retention in GA). Patient satisfaction
grades were not different in the two groups. We conclude that LA in inguinal hernia repair does not adversely affect pulmonary
functions, patients feel less pain, and patient satisfaction is comparable to that with GA.
Electronic Publication 相似文献
960.
P Leprince F Heloire B Eymard P Léger D Duboc A Pavie 《The Journal of heart and lung transplantation》2002,21(7):822-824
A 28-year-old male patient diagnosed with Becker muscular dystrophy (BMD)-associated cardiomyopathy was successfully bridged to transplantation with the Cardiowest total artificial heart. Dramatic improvement of muscular functional status occurred following transplantation. 相似文献