全文获取类型
收费全文 | 10347篇 |
免费 | 808篇 |
国内免费 | 46篇 |
专业分类
耳鼻咽喉 | 119篇 |
儿科学 | 341篇 |
妇产科学 | 286篇 |
基础医学 | 1542篇 |
口腔科学 | 209篇 |
临床医学 | 1040篇 |
内科学 | 2083篇 |
皮肤病学 | 132篇 |
神经病学 | 869篇 |
特种医学 | 257篇 |
外科学 | 1177篇 |
综合类 | 279篇 |
一般理论 | 9篇 |
预防医学 | 1124篇 |
眼科学 | 193篇 |
药学 | 935篇 |
中国医学 | 29篇 |
肿瘤学 | 577篇 |
出版年
2022年 | 108篇 |
2021年 | 199篇 |
2020年 | 108篇 |
2019年 | 146篇 |
2018年 | 173篇 |
2017年 | 129篇 |
2016年 | 176篇 |
2015年 | 182篇 |
2014年 | 209篇 |
2013年 | 441篇 |
2012年 | 598篇 |
2011年 | 637篇 |
2010年 | 352篇 |
2009年 | 332篇 |
2008年 | 545篇 |
2007年 | 580篇 |
2006年 | 556篇 |
2005年 | 538篇 |
2004年 | 517篇 |
2003年 | 479篇 |
2002年 | 521篇 |
2001年 | 262篇 |
2000年 | 212篇 |
1999年 | 209篇 |
1998年 | 113篇 |
1997年 | 122篇 |
1996年 | 116篇 |
1995年 | 100篇 |
1994年 | 84篇 |
1993年 | 78篇 |
1992年 | 165篇 |
1991年 | 141篇 |
1990年 | 123篇 |
1989年 | 116篇 |
1988年 | 126篇 |
1987年 | 128篇 |
1986年 | 117篇 |
1985年 | 101篇 |
1984年 | 97篇 |
1983年 | 93篇 |
1982年 | 77篇 |
1981年 | 88篇 |
1980年 | 77篇 |
1979年 | 76篇 |
1978年 | 61篇 |
1977年 | 55篇 |
1976年 | 67篇 |
1974年 | 62篇 |
1973年 | 54篇 |
1972年 | 59篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Toidi Adekambi Chris C. Ibegbu Stephanie Cagle Ameeta S. Kalokhe Yun F. Wang Yijuan Hu Cheryl L. Day Susan M. Ray Jyothi Rengarajan 《The Journal of clinical investigation》2015,125(5):1827-1838
BACKGROUND. The identification and treatment of individuals with tuberculosis (TB) is a global public health priority. Accurate diagnosis of pulmonary active TB (ATB) disease remains challenging and relies on extensive medical evaluation and detection of Mycobacterium tuberculosis (Mtb) in the patient’s sputum. Further, the response to treatment is monitored by sputum culture conversion, which takes several weeks for results. Here, we sought to identify blood-based host biomarkers associated with ATB and hypothesized that immune activation markers on Mtb-specific CD4+ T cells would be associated with Mtb load in vivo and could thus provide a gauge of Mtb infection.METHODS. Using polychromatic flow cytometry, we evaluated the expression of immune activation markers on Mtb-specific CD4+ T cells from individuals with asymptomatic latent Mtb infection (LTBI) and ATB as well as from ATB patients undergoing anti-TB treatment.RESULTS. Frequencies of Mtb-specific IFN-γ+CD4+ T cells that expressed immune activation markers CD38 and HLA-DR as well as intracellular proliferation marker Ki-67 were substantially higher in subjects with ATB compared with those with LTBI. These markers accurately classified ATB and LTBI status, with cutoff values of 18%, 60%, and 5% for CD38+IFN-γ+, HLA-DR+IFN-γ+, and Ki-67+IFN-γ+, respectively, with 100% specificity and greater than 96% sensitivity. These markers also distinguished individuals with untreated ATB from those who had successfully completed anti-TB treatment and correlated with decreasing mycobacterial loads during treatment.CONCLUSION. We have identified host blood-based biomarkers on Mtb-specific CD4+ T cells that discriminate between ATB and LTBI and provide a set of tools for monitoring treatment response and cure.TRIAL REGISTRATION. Registration is not required for observational studies.FUNDING. This study was funded by Emory University, the NIH, and the Yerkes National Primate Center. 相似文献
2.
3.
4.
We live in a technology-saturated world, evidenced by widespread, global use of the Internet and other forms of technology. Technology offers nearly limitless connectivity, information-sharing, and communication. Unfortunately, with these opportunities come risks, especially for children, and pediatric healthcare providers have a responsibility to be aware and informed of these risks and how to respond. This article provides a breakdown of the broad phenomenon of electronic aggression and offers practice implications for healthcare providers. 相似文献
5.
6.
Anil K Jain Ravindra S Chauhan Ish K Dhammi Aditya V Maheshwari Ruma Ray 《The spine journal》2007,7(2):249-253
BACKGROUND CONTEXT: Pseudoaneurysm of the aorta in association with vertebral tuberculosis is a rare phenomenon. With the resurgence of human immunodeficiency virus (HIV) and associated resistant tuberculosis, this life-threatening complication requires greater awareness. PURPOSE: Our purpose is to report the rare presentation and successful management of tubercular pseudoaneurysm of the aorta in association with vertebral tuberculosis, and to highlight the clinicoradiological features for early and prompt diagnosis of this potentially fatal, but treatable, disease. STUDY DESIGN: A single case report and overview of the disease comprises the design of this study. PATIENT SAMPLE: The patient, already surgically intervened, is a 27-year-old male with increasing abdominal and back pain, upper motor neuron signs, and constitutional signs and symptoms. OUTCOME MEASURES: At 33 months follow-up, there is complete resolution of the signs and symptoms, and the patient is back to his previous vocation. METHODS: The diagnosis was confirmed by magnetic resonance imaging and contrast computed tomography. Endoaneurysmorrhaphy of the pseudoaneurysm along with a complete course of antitubercular treatment was given to the patient, and he has presently been followed up for 33 months. RESULTS: The patient's signs and symptoms have been completely resolved without any recurrence. CONCLUSION: Despite the use of modern chemotherapy and imaging techniques, this disastrous complication still occurs and reinforces the need for early suspicion, diagnosis, surgical resection, and antitubercular therapy along with close postoperative follow-up to prevent recurrence. With the resurgence of HIV (and other immunocompromised states) associated and resistant tuberculosis, we should be more alert than ever to this life-threatening complication. 相似文献
7.
The authors report a case of massive Trichuris trichiura infection, resulting in severe anaemia and congestive cardiac failure in a 9-year-old Iban boy, who was resistant to the usual oral anthelmintic treatment, but promptly responded to mebendazole retention enema. This patient also had an associated Entamoeba histolytica infection. 相似文献
8.
9.
Ray Walker M.D. Debra Minor-Schork R.N. M.S.N. Richard Bloch Ph.D. James Esinhart Ph.D. 《The Psychiatric quarterly》1996,67(3):235-243
Objective. 1. To identify risk factors associated with psychiatric rehospitalization within six months, using global clinical assessments and demographic information and; 2. To determine if risk factors for a hospital in a rural region are similar to those reported for urban hospitals. Method. The setting was a psychiatric unit within a general hospital. All adult admissions for one year were assigned scores on the North Carolina Functional Assessment Scale (NCFAS) and the Global Assessment of Functioning (GAF) scale. Patients were interviewed six months after discharge to determine if they had been rehospitalized and to assign new NCFAS and GAF scores. Results. Significant risk of rehospitalization was predicted by: 1. NCFAS score >90; 2. history of prior hospitalization; 3. nursing home residence; 4. referral from a small community hospital and; 5. non-compliance with outpatient appointments. Conclusions. Global assessments and demographic information collected during an index admission can generate factors to identify patients at risk for rehospitalization within six months. History of prior admissions and non-compliance with outpatient treatment, reported as risk factors in urban settings, were found also to be risk factors in a rural region.He was formerly Assistant Professor, Center for Health Sciences Statistics, East Carolina University School of Medicine. 相似文献
10.
Heterosexual men and homosexual men rated how arousing different sexual fantasies were and how often they had used these fantasies
over the previous year. Within each group, sensual and genital same-orientation fantasies were more arousing than either public-sex
or dominance-submissive fantasies, which in turn were more arousing than aggressive-sex fantasies. For both heterosexual and
homosexual men the extent to which a fantasy was arousing correlated with the person's experience of the activity depicted
in the fantasy. The frequency of use of a fantasy correlated positively with its arousal level but not always subtantially
so. The results are discussed in the context of the mediating role of fantasy in human sexual arousal. 相似文献