全文获取类型
收费全文 | 1640篇 |
免费 | 80篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 43篇 |
妇产科学 | 53篇 |
基础医学 | 245篇 |
口腔科学 | 82篇 |
临床医学 | 164篇 |
内科学 | 297篇 |
皮肤病学 | 26篇 |
神经病学 | 113篇 |
特种医学 | 34篇 |
外科学 | 152篇 |
综合类 | 26篇 |
预防医学 | 112篇 |
眼科学 | 128篇 |
药学 | 123篇 |
中国医学 | 11篇 |
肿瘤学 | 95篇 |
出版年
2024年 | 4篇 |
2023年 | 20篇 |
2022年 | 79篇 |
2021年 | 99篇 |
2020年 | 63篇 |
2019年 | 57篇 |
2018年 | 71篇 |
2017年 | 53篇 |
2016年 | 73篇 |
2015年 | 65篇 |
2014年 | 85篇 |
2013年 | 102篇 |
2012年 | 151篇 |
2011年 | 156篇 |
2010年 | 85篇 |
2009年 | 74篇 |
2008年 | 92篇 |
2007年 | 98篇 |
2006年 | 64篇 |
2005年 | 56篇 |
2004年 | 41篇 |
2003年 | 43篇 |
2002年 | 29篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1976年 | 1篇 |
1973年 | 3篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1728条查询结果,搜索用时 15 毫秒
1.
2.
Damage control surgery for abdominal trauma. 总被引:5,自引:0,他引:5
OBJECTIVE: To review the physiology, indications, technical aspects, morbidity, and mortality of damage control surgery. DESIGN: Retrospective study of published papers. SETTING: Teaching hospital, United Arab Emirates. INTERVENTIONS: A MEDLINE search on damage control surgery for the years 1981-2001. Further articles were retrieved from the references of the original articles. RESULTS: The indications for damage control surgery are: the need to terminate a laparotomy rapidly in an exsanguinating, hypothermic patient who had developed a coagulopathy and who is about to die on the operating table; inability to control bleeding by direct haemostasis; and inability to close the abdomen without tension because of massive visceral oedema and a tense abdominal wall. The principles of damage control surgery are: Phase I: laparotomy to control haemorrhage by packing; shunting, or balloon tamponade, or both; control of intestinal spillage by resection or ligation of damaged bowel, or both. Phase II: physiological resuscitation to correct hypothermia, metabolic acidosis, and coagulopathy. Phase III: planned reoperation for definitive repair. Damage control surgery is appropriate in a small number of critically ill patients who are likely to require substantial hospital resources; it has a high mortality (mean 45%, range (10%-69%). CONCLUSION: Damage control surgery offers a simple effective alternative to the traditional surgical management of complex or multiple injuries in critically injured patients. Phases I and II can be done at a rural hospital before transfer to a major trauma centre for definitive repair. 相似文献
3.
Zhengang Yang Xiaochen Lu Donita L. Frazier Masoud Panjehpour Mike A. Breider 《Lasers in surgery and medicine》1994,15(4):342-350
Effective antitumor photodynamic therapy (PDT) may be related to damage of vasculature within the tumor. The purpose of this study was to determine if tumor cells secrete factors that stimulate proliferation of human umbilical vein endothelial cells (HUVEC) and result in enhanced sensitivity of HUVEC to aluminum-sulfonated phthalocyanine (AISPc)-PDT. Three human tumor cell lines—pharyngeal squamous carcinoma, colonic carcinoma, and mammary carcinoma—were used in this study. Co-culture of HUVEC and either squamous carcinoma or colonic carcinoma, but not mammary carcinoma, significantly increased HUVEC proliferation and AlSPc-PDT mediated cell damage. In addition, supernatant from squamous carcinoma and colonic carcinoma cultures also stimulated HUVEC proliferation and sensitivity to AISPc-PDT. Both supernatant and cell lysate from squamous carcinoma cells contained angiogenic factors consistent with basic and acidic fibroblast growth factors, as evidenced by Western blot analysis and BALB/c 3T3 fibroblast cell proliferation assays. Collectively, these results suggest that selected tumor cell lines produce angiogenic factors that induce HUVEC proliferation and subsequently enhance sensitivity to AISPc-PDT. © 1994 Wiley-Liss, Inc. 相似文献
4.
Bottini N MacMurray J Peters W Rostamkhani M Comings DE 《Molecular genetics and metabolism》2002,77(3):226-229
The acid phosphatase (ACP1) locus codes for a low molecular weight protein tyrosine phosphatase (LMPTP) that is found ubiquitously in human tissues. The *A allele of the ACP1 gene is associated with lower total enzymatic activity than the *B and *C alleles. An association between the *A allele and extreme values of body-mass-index (BMI) and dyslipidemia has previously been described in several samples of obese subjects from the Italian population. In the present study, we investigated the relationship between ACP1 *A allele genotypes (*A/*A, *A/*B, and *A/*C) and non-*A allele genotypes (*B/*B, *B/*C, and *C/*C) and metabolic variables in 277 Caucasian post-menopausal subjects consisting of 82 non-obese subjects (BMI=29), 60 moderately obese (BMI 30-34) and 135 very obese (BMI>/=35) subjects. ACP1 genotypes were found to be significantly associated with total cholesterol (p=0.002) and triglyceride (p=0.001) levels in the obese and very obese women only. The significantly lower levels of triglycerides in *A carriers in this group suggest a protective effect of the *A allele against hypertriglyceridemia. It has been unclear why some individuals who gain weight develop dyslipidemia and other aspects of the metabolic syndrome while others do not. The present study suggests that those who gain weight and carry the ACP1 *A allele may be partially protected against developing the metabolic syndrome. The confirmation of ACP1 as a modifier gene of the metabolic complications could open the door to the prevention of the lethal complications of obesity. 相似文献
5.
R. S. Verma R. A. Conte M. J. Macera A. S. S. I. Khan S. Hebi A. A. Masoud A. Al Zaman M. Al Bader 《American journal of medical genetics. Part A》1993,46(1):104-108
A newborn infant was referred because of low-set ears, mild downward slant of the palpebral fissues, micrognathia with higharched palate, a flat midface, small mouth, and thin upper lip with cupid bow configuration. To some extent her cry resembled that associated with cri du chat syndrome. Cytogenetic findings with G- and Q-banding alone failed to characterize precisely the complex translocations. By the chromosome in situ suppression (CISS) hybridization technique using whole chromosome specific probes, a complex 4 breakpoint rearrangement involving both arms of a single chromosome 1 with the long arms of chromosome 5 and 11 was disclosed, i.e., 46,XX, der(1),t(1;5) t(1;11) (5qter→5q31::1p31.3→1q44::11q23→11qter;5pter→5q31::1p31.3→1pter;11pter→11q23::1q44→1qter). Gene deregulation and position effect may explain the multiple anomalies in individuals with apparently balanced translocations may shed some light towards unveiling the clinical consequences associated with aberrations which are presumably balanced. © 1993 Wiley-Liss, Inc. 相似文献
6.
Mohammad-naghi Tahmasebi Mohsen Saghari Masoud Moslehi Ali Gholamrezanezhad 《BMC medical physics》2005,5(1):1-6
Background
Scintigraphy has been considered as competitive to MRI, but limited data are available on the accuracy of single photon emission tomography (SPECT) compared with MRI for the assessment of meniscal tears. Our objective was to assess the value of SPECT in comparison to MRI.Methods
Between January 2003 and March 2004, sixteen patients were studied with both modalities and the accuracy rates of SPECT scan results, and MRI findings in the diagnosis of meniscal tears were compared. Arthroscopy was the gold standard.Results
The respective sensitivity rate, specificity rate, and positive and negative predictive accuracies of MRI were 89%, 94%, 93%, and 79% and for SPECT those were 78%, 94%, 94%, and 88%. There was good agreement on the presence or absence of tears between two modalities (κ statistic = 0.699).Conclusion
SPECT and MRI are both valuable imaging techniques. SPECT is a useful alternative when MRI is unavailable or unsuitable and it is beneficial when more possible accuracy is desired (such as when MRI results are either inconclusive or conflict with other clinical data). 相似文献7.
8.
Alamawi S Abutaleb A Qasem L Masoud S Memish Z Al Khairy K Kheir O Bernvil S Hajeer AH 《British journal of biomedical science》2003,60(2):102-104
HIV-1 p24 antigen testing was introduced to increase sensitivity in the early detection of HIV infection in blood donors. Since the introduction of HIV-1 p24 antigen testing in Saudi Arabia, we have failed to detect a single positive case. Over a three-year period, only four indeterminates were detected out of 24,654 blood donors. All four proved negative by confirmatory testing. Based on this experience, we believe that resources would be better directed to pooled nucleic acid testing and that p24 serological testing should be abandoned. 相似文献
9.
Polyorchidism is usually diagnosed incidentally when the patient undergoes imaging or surgery for some other reason. Although we are facing lack of evidence in different steps of diagnostic and therapeutic workup of these patients, this disorder is usually considered benign, not requiring any intervention. We report the case of a man complaining of a palpable mass in his scrotum. We evaluated the patient using ultrasound, MRI and serum tumour marker level measurement. The patient was finally diagnosed with polyorchidism (three testes). For the management, we recommended annual physical examination, US examination and serum tumour marker level measurement. 相似文献
10.
el-Shazley MK Ibrahim AG Masoud GM 《The Journal of the Egyptian Public Health Association》1996,71(3-4):229-241
This study was carried out to determine the risk of some social and biological maternal factors which may contribute to occurrence of anemia among mothers and preschool children. A community based comparative study was chosen for the conduction of this work. The target population were 400 women in the child bearing period, having at least one preschool child (440). Capillary blood samples were taken by finger prick method and hemoglobin level was estimated by Sahly method. According to the cut off level of hemoglobin, women were classified into anemic and non anemic. In addition to that, 440 preschool children belonging to these women were classified according to the cut off level of their hemoglobin into 165 anemic children and 275 non anemic ones. An interview questionnaire was used to collect the data. Analysis of results showed that age of mother (30 years and above), illiteracy, high parity, history of previous abortion, history of previous perinatal mortality, small inter-birth interval and non use of contraceptives are significant risk factors for mothers. However, mother occupation and state of pregnancy has no role in occurrence of anemia among mothers. In addition to that, high parity, history of previous abortion, history of perinatal mortality, short inter-birth interval, non use of contraceptives and pregnancy are maternal risk factors responsible for anemia among preschool children. While, mother age, education and occupation has no role for occurrence of anemia among preschool children. 相似文献