全文获取类型
收费全文 | 7251篇 |
免费 | 512篇 |
国内免费 | 31篇 |
专业分类
耳鼻咽喉 | 112篇 |
儿科学 | 202篇 |
妇产科学 | 133篇 |
基础医学 | 1030篇 |
口腔科学 | 451篇 |
临床医学 | 569篇 |
内科学 | 1490篇 |
皮肤病学 | 199篇 |
神经病学 | 611篇 |
特种医学 | 158篇 |
外科学 | 973篇 |
综合类 | 23篇 |
一般理论 | 4篇 |
预防医学 | 712篇 |
眼科学 | 216篇 |
药学 | 505篇 |
中国医学 | 48篇 |
肿瘤学 | 358篇 |
出版年
2024年 | 12篇 |
2023年 | 60篇 |
2022年 | 125篇 |
2021年 | 221篇 |
2020年 | 157篇 |
2019年 | 193篇 |
2018年 | 247篇 |
2017年 | 184篇 |
2016年 | 203篇 |
2015年 | 231篇 |
2014年 | 304篇 |
2013年 | 360篇 |
2012年 | 571篇 |
2011年 | 560篇 |
2010年 | 316篇 |
2009年 | 224篇 |
2008年 | 415篇 |
2007年 | 392篇 |
2006年 | 386篇 |
2005年 | 359篇 |
2004年 | 331篇 |
2003年 | 322篇 |
2002年 | 235篇 |
2001年 | 139篇 |
2000年 | 144篇 |
1999年 | 129篇 |
1998年 | 42篇 |
1997年 | 29篇 |
1996年 | 35篇 |
1995年 | 41篇 |
1994年 | 31篇 |
1993年 | 27篇 |
1992年 | 78篇 |
1991年 | 73篇 |
1990年 | 72篇 |
1989年 | 48篇 |
1988年 | 65篇 |
1987年 | 59篇 |
1986年 | 52篇 |
1985年 | 50篇 |
1984年 | 30篇 |
1983年 | 22篇 |
1982年 | 12篇 |
1981年 | 12篇 |
1979年 | 23篇 |
1975年 | 16篇 |
1974年 | 14篇 |
1973年 | 16篇 |
1972年 | 15篇 |
1969年 | 13篇 |
排序方式: 共有7794条查询结果,搜索用时 31 毫秒
61.
M Muszkat J O Cardeal C I de Almeida M I Campos C J de Campos 《Arquivos de neuro-psiquiatria》1990,48(2):201-203
Six stroke patients were studied using a dichotic listening CV task, 4 with left hemisphere infarction, 2 with right hemisphere infarction. It was observed a "lesion-effect", a shift of hemisphere prevalence to the side opposite a brain lesion. The authors suggest that the lesion-effect can be explained by the auditory extinction phenomenon at the linguistic level. 相似文献
62.
Low flow veno-venous ECMO: an experimental study 总被引:1,自引:0,他引:1
Calderón M Verdín R Galván J Gonzalez M Cárdenas H Campos R Vidrio H Amezcua J 《The Journal of extra-corporeal technology》1994,26(2):75-78
Clinical use of extracorporeal membrane oxygenation (ECMO) and carbon dioxide removal (ECCO 2R) have become well established techniques for the treatment of severe respiratory failure; however they require full cardiopulmonary bypass, representing major procedures with high morbidity. We theorized the possibility of an efficient low flow veno-venous extracorporeal membrane gas exchange method. Four mongrel 12 kg dogs were submitted to veno-venous extracorporeal membrane gas exchange via a jugular dialysis catheter using a low flow (10 ml/min) roller pump and a membrane oxygenator for a period of four hours. Respiratory rate was set at 4 breaths/min with a FiO 2 of 21% and ventilatory dead space was increased. Adequate gas exchange was obtained (pO 2139, pCO 224, Sat 99.4%), without major hemodynamic changes or hematuria. Our results demonstrate the feasibility of a low flow, less aggressive system. Further research should be considered. 相似文献
63.
Campos Jr D 《Jornal de pediatria》1995,71(5):266-269
The author studied the value of therapeutic test for the diagnosis and treatment of kala-azar in children by comparing two groups of patients. The identification of Leishmania donovani in smears of bone marrow confirmed the diagnosis in all fifty seven patients of the control group. In another group with sixteen children, the diagnosis was based on the successful response to the treatment with meglumine antimonate. In none of the patients of the second group the protozoa was identified and the decision to give the specific treatment was based on epidemiological, clinical, biochemical and hematological criteria for the disease. Statistical analysis was performed by Student t test to compare clinical, biochemical and hematological variables between the groups. None of the differences between the groups was statistically significant, suggesting that the therapeutic test was valid, and all patients who received treatment had kala-azar. 相似文献
64.
Campos GW 《Cadernos de saúde pública / Ministério da Saúde, Funda??o Oswaldo Cruz, Escola Nacional de Saúde Pública》1999,15(1):187-193
There are 80 medical schools in Brazil, of which 14 were selected for this study based on their regional distribution and representative characteristics. A survey in 1995 showed a heavy concentration (86%) of in-house practical training in major university hospitals. Only 14% of the hands-on training of students occurred in primary health or community-based clinics or other services related to the nationwide Unified Health System (SUS). University hospitals have been organized according to the specialized ward model, with extensive fragmentation of health care. This article makes several proposals for improving medical training. Changes in medical care are considered crucial to improvement of physician training. Reforms in medical care in such hospitals would be more important than reformulating the medical school itself. A move towards other health care services is recommended; more time devoted to teaching in primary health care systems and other extramural services is crucial for achieving better physician responsibility and competence. 相似文献
65.
Laparoscopic management of benign solid and cystic lesions of the liver 总被引:20,自引:0,他引:20
Katkhouda N Hurwitz M Gugenheim J Mavor E Mason RJ Waldrep DJ Rivera RT Chandra M Campos GM Offerman S Trussler A Fabiani P Mouiel J 《Annals of surgery》1999,229(4):460-466
OBJECTIVE: The authors present their experience in the laparoscopic management of benign liver disease. The aim of the study is to analyze technical feasibility and evaluate immediate and long-term outcome. SUMMARY BACKGROUND DATA: Indications for the laparoscopic management of varied abdominal conditions have evolved. Although the minimally invasive treatment of liver cysts has been reported, the laparoscopic approach to other liver lesions remains undefined. METHODS: Between September 1990 and October 1997, 43 patients underwent laparoscopic liver surgery. There were two groups of benign lesions: cysts (n = 31) and solid tumors (n = 12). Indications were solitary giant liver cysts (n = 16), polycystic liver disease (n = 9), hydatid cyst (n = 6), focal nodular hyperplasia (n = 3), and adenoma (n = 9). Only solid tumors, hydatid cysts, and patients with polycystic disease and large dominant cysts located in anterior liver segments were included. All giant solitary liver cysts were considered for laparoscopy. Patients with cholangitis, cirrhosis, and significant cardiac disease were excluded. Data were collected prospectively. RESULTS: The procedures were completed laparoscopically in 40 patients. Median size was 4 cm for solid nodules and 14 cm for solitary liver cysts. Conversion occurred in three patients (7%), for bleeding (n = 2) and impingement of a solid tumor on the inferior vena cava (n = 1). The median operative time was 179 minutes. All solitary liver cysts were fenestrated in less than 1 hour. There were no deaths. Complications occurred in 6 cases (14.1%). Two hemorrhagic and two infectious complications were noted after management of hydatid cysts. There were no complications after resection of solid tumors. Three patients received transfusions (7%). The median length of stay was 4.7 days. Median follow-up was 30 months. There was no recurrence of solitary liver or hydatid cysts. One patient with polycystic disease had symptomatic recurrent cysts at 6 months requiring laparotomy. CONCLUSION: Laparoscopic liver surgery can be accomplished safely in selected patients with small benign solid tumors located in the anterior liver segments and giant solitary cysts. The laparoscopic management of polycystic liver disease should be reserved for patients with a limited number of large, anteriorly located cysts. Hydatid disease is best treated through an open approach. 相似文献
66.
The extent of Barrett's esophagus depends on the status of the lower esophageal sphincter and the degree of esophageal acid exposure 总被引:10,自引:0,他引:10
Oberg S DeMeester TR Peters JH Hagen JA Nigro JJ DeMeester SR Theisen J Campos GM Crookes PF 《The Journal of thoracic and cardiovascular surgery》1999,117(3):572-580
OBJECTIVE: The purpose of this study was to assess whether the extent of intestinal metaplasia is related to the severity of the gastroesophageal reflux disease. METHODS: A total of 556 consecutive patients with symptoms suggestive of foregut disease had upper gastrointestinal endoscopy with extensive biopsies from the gastroesophageal junction and the esophagus. All patients had esophageal motility and 24-hour pH monitoring. In 411 patients, cardiac-type mucosa was identified; in 147 patients, the cardiac-type mucosa showed intestinal metaplasia. They were divided into 3 groups based on the extent of intestinal metaplasia commonly seen clinically: long segments (>3 cm), short segments (<3 cm), and limited to the gastroesophageal junction. The duration of symptoms, the status of the lower esophageal sphincter, the degree of esophageal acid exposure, and the time to clear a reflux episode were assessed in each group. RESULTS: The presence of intestinal metaplasia in cardiac-type mucosa was associated with the hallmarks of gastroesophageal reflux disease. The extent of intestinal metaplasia correlated strongly with the degree of esophageal acid exposure (r = 0.711; P <.001) and inversely with the lower esophageal sphincter pressure (r = 0.351; P <.001) and length (r = 0. 259; P =.002). Patients with a long segment of intestinal metaplasia (>3 cm) had longer duration of symptoms (16 years) than those patients with a segment of intestinal metaplasia less than 3 cm (10 years; P =.048) or those patients with intestinal metaplasia limited to the gastroesophageal junction (10 years; P =.01). CONCLUSION: The extent of intestinal metaplasia, that is, Barrett's esophagus, is related to the status of the lower esophageal sphincter and the degree of esophageal acid exposure. 相似文献
67.
The host-plant fidelity, seasonality, and population dynamics of 3 species of Culex (Culex) were examined from monthly samples of mosquito immatures extracted from the leaf axils of Eryngium pandanifolium and Eryngium cabrerae growing sympatrically in the Punta Lara region of Buenos Aires Province, Argentina. Culex hepperi was collected only from E. pandanifolium, and abundance peaks of its larvae and pupae were asynchronous in forest and field habitats. However, the proportion of plants positive for Cx. hepperi, as well as larval densities and developmental success, did not differ between forest and field. Culex renatoi was collected only from E. cabrerae in the field habitat. The monthly numbers of Cx. hepperi and Cx. renatoi were not significantly correlated with the proportion of their host plants that held water. The stage-specific distributions of Cx. hepperi and C. renatoi numbers were highly skewed towards 1st instars and did not differ between species or, for Cx. hepperi, between forest and field habitats. Culex castroi was collected regularly from the axils of both species of Eryngium, but usually in lesser numbers than either Cx. hepperi or Cx. renatoi. Association analyses indicated significant positive associations between Cx. castroi and the other 2 culicine species in host plants. Culex renatoi occurred preferentially in small E. cabrerae, but Cx. castroi did not discriminate plants based on their size. These 3 species of Culex are known only from Eryngium spp. phytotelmata. We suggest that their host-plant specificity is maintained by oviposition preferences, which are more highly selective for Cx. hepperi or Cx. renatoi than for Cx. castroi. 相似文献
68.
Emilio C. Campos Maria Rosa Zanasi 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》1978,205(2):101-111
Zusammenfassung Es wurde nachgewiesen, daß bei konkomitierender Esotropie außer sensorischen Folgen auch senso-motorische Folgezustände vorkommen. Sie lassen sich vor allem mit Prismen nachweisen und werden als fusionsbedingt aufgefaßt (anomale Fusionsbewegungen).Bei 30 Patienten wurden die Eigenschaften dieser Vorgänge untersucht und erklärt. Schließlich wurde der Zusammenhang zwischen den anomalen Fusionsbewegungen und schon früher von anderen Autoren beschriebenen Krankheitsbildern analysiert, die je nach der ihnen zugrundegelegten Auffassung, unter verschiedenen Namen bekannt waren.
Anomalous fusional movements: The sensorimotor aspect of anomalous binocular vision
Summary It has been demonstrated that, besides sensory adaptation phenomena, sensorimotor phenoma may also develop in concomitant esotropia. The existence of the latter entity can be shown particularly by means of prisms and is interpreted as fusional in origin. It is therefore defined as anomalous fusional movements.The features of these anomalous fusional movements were studied in a group of 30 patients, mainly in order to investigate their finality.Correlations were evaluated between anomalous fusional movements and entities previously described by different names according to the interpretation given them by various authors.相似文献
69.
Julio C. U. Coelho M.D. Ph.D. Luiz Clemente M.D. Jorge E. F. Matias M.D. Antonio C. L. Campos M.D. M.S. Julio C. Wiederkehr M.D. M.S. 《World journal of surgery》1992,16(6):1111-1115
The electromyographic activity of the gastrointestinal tract was studied in 28 patients undergoing gastric, biliary, and pancreatic operations with reconstruction of the gastrointestinal tract with a Roux-en-Y limb. The Roux-en-Y limb was constructed 1 to 5 years before the study in 8 patients (chronic Roux-en-Y) and at the operation in which the electrodes were implanted in 20 patients (recent Roux-en-Y). All four phases of the migrating motor complex (MMC) were identified in the gastrointestinal tract, including in the Roux-en-Y limb. The duration of the MMC was 82.4 ± 22.3 min in the patients with chronic Roux-en-Y and 89.0 ± 25.1 min in the patients with recent Roux-en-Y. Food ingestion converted the MMC to the fed pattern in the entire gastrointestinal tract, including the Roux-en-Y limb in 16 (76.2%) of 21 recordings of the patients with chronic Roux-en-Y and in 27 (84.4%) of 32 recordings of the patients with recent Roux-en-Y. The duration of the fed pattern was 170 ± 34 min in the patients with chronic Roux-en-Y and 154 ± 26 min in the patients with recent Roux-en-Y. The findings of this study indicate that the electromyographic activity of the Roux-en-Y limb is normal during both fasting and fed states, even many years after the construction of the Roux-en-Y.
Resumen Se estudió la motilidad electromiográphica del tracto gastrointestinal de 28 pacientes sometidos a operaciones gástricas, biliares y pancreáticas con reconstrucción de tipo Roux-en-Y. El asa de Roux-en-Y fue construida 1–5 años antes del estudio en un grupo de ocho pacientes (Roux-en-Y crónica) y en otro grupo de 20 lose electrodos fueron implantados durante la operación (Roux-en-Y reciente). Se identificaron las cuatro fases del complejo motormigratorio en el tracto gastrointestinal, incluso en el asa de Roux-en-Y. La duración del CMM fue 82.4 ± 22.3 min en los pacientes con Roux-en-Y crónica y 89.0 ± 25.1 min en los pacientes con Roux-en-Y reciente. Con la ingesta de alimento se substituyó el CMM por el patrón postalimentación en la totalidad del tracto gastrointestinal incluso en el asa de Roux-en-Y, en 16 de los 21 registros (76.2%) de los pacientes con Roux-en-Y crónica y en 27 de los 32 registros (84.4%) de los pacientes con Roux-en-Y reciente. La duración del patrón postalimentacón fue 170 ± 34 min en los pacientes con Roux-en-Y crónica y 154 ± 26 min en los pacientes con Roux-en-Y reciente. Los hallazgos en este estudio indican que la actividad electromiográphica del asa de Roux-en-Y es normal durante las fases de ayuno o de alimentación, aún transcurridos muchos años de la confección del Roux-en-Y.
Résumé L'activité électromyographique de l'intestin grêle a été étudiée chez 28 patients ayant eu des interventions portant sur le l'estomac, les voies biliaires ou le pancréas et comportant une reconstruction avec une anse en Y. Chez huit de ces patients, l'intervention initiale pendant laquelle cette anse en Y avait été mopntée, datait de 1 à 5 ans (anse en Y dite chronique). Chez les 20 autres patients, les électrodes pour mesurer l'activité électrique ont été placées pendant l'intervention initiale (anse en Y dite récente). Les quatre phases du complexe moteur migrateur (CMM) ont été identifiées sur l'intestin et sur l'anse en Y. La durée du CMM a été de 82.4 ± 22.3 min chez les patients ayant une anse en Y chronique, et de 89.0 ± 25.1 min chez les patients ayant une anse en Y récente. Pendant l'alimentation, la courbe d'activité dite d'alimentation a remplacé les CMM dans le tube intestinal en entier, y compris l'anse en Y chez 16 des 21 enregistrements (76.2%) des patients ayant une anse en Y chronique et chez 27 des 32 (84.4%) enregistrements des patients ayant une anse en Y récente. La durée des courbes dites d'alimentation a été de 170 ± 34 min chez les patients avec une anse en Y chronique et de 154 ± 26 min chez les patients avec une anse en Y récente. Les résultats de cette étude indiquent que l'activité électromyographique des anses en Y est normale pendant le jeûne et pendant l'alimentation, et ce même plusieurs années après la confection d'une anse en Y.相似文献
70.
Situational factors associated with AIDS risk behavior lapses and coping strategies used by gay men who successfully avoid lapses 总被引:1,自引:1,他引:0
下载免费PDF全文
![点击此处可从《American journal of public health》网站下载免费的PDF全文](/ch/ext_images/free.gif)
J A Kelly S C Kalichman M R Kauth H G Kilgore H V Hood P E Campos S M Rao T L Brasfield J S St Lawrence 《American journal of public health》1991,81(10):1335-1338
While most gay men have reduced behavior practices at high risk for HIV infection, there is growing evidence that many also lapse to unsafe sex. This study examined situational factors related to risk behavior lapses as well as coping strategies used by men who successfully resist lapse urges. A convenience sample of 470 men patronizing gay bars or attending social organization meetings in four cities was surveyed. Forty-five percent of men were classified as "lapsers" (those who had had unprotected anal intercourse in the previous 6 months) and 24% were classified as "resisters" (those who successfully resisted urges to engage in this behavior). All provided information concerning the importance of factors related to the most recent occurrence of either unsafe sex or resisting unsafe urges. Most episodes of unsafe sex occurred outside monogamous relationships and with partners of unknown HIV serostatus, although simply inquiring about partner serostatus was relatively common. Lapsers rated affectionate feelings and wishing to please a partner as well as spontaneity of unsafe sex as the most important situational factors surrounding high-risk behavior. Resisters of unsafe sex urges reported active cognitive self-guidance, experience in safe sex, and recall of both AIDS fears and safety benefits as their most important coping strategies. Gay men who continue high-risk behavior may be overrelying on partner reports of negative serostatus. Lapse prevention approaches tailored to situations that create increased risk vulnerability must be developed. Teaching skills already used by men who successfully resist unsafe sex urges might be one approach. 相似文献