全文获取类型
收费全文 | 194140篇 |
免费 | 1218篇 |
国内免费 | 162篇 |
专业分类
耳鼻咽喉 | 1242篇 |
儿科学 | 7046篇 |
妇产科学 | 3321篇 |
基础医学 | 19401篇 |
口腔科学 | 1771篇 |
临床医学 | 13703篇 |
内科学 | 33726篇 |
皮肤病学 | 811篇 |
神经病学 | 17983篇 |
特种医学 | 9675篇 |
外科学 | 31408篇 |
综合类 | 4114篇 |
一般理论 | 31篇 |
预防医学 | 19206篇 |
眼科学 | 2880篇 |
药学 | 11035篇 |
28篇 | |
中国医学 | 679篇 |
肿瘤学 | 17460篇 |
出版年
2023年 | 122篇 |
2022年 | 361篇 |
2021年 | 870篇 |
2020年 | 546篇 |
2019年 | 833篇 |
2018年 | 22952篇 |
2017年 | 17950篇 |
2016年 | 20436篇 |
2015年 | 2232篇 |
2014年 | 2274篇 |
2013年 | 2741篇 |
2012年 | 8356篇 |
2011年 | 21609篇 |
2010年 | 19964篇 |
2009年 | 12388篇 |
2008年 | 20041篇 |
2007年 | 22123篇 |
2006年 | 1155篇 |
2005年 | 2679篇 |
2004年 | 3747篇 |
2003年 | 4495篇 |
2002年 | 2588篇 |
2001年 | 358篇 |
2000年 | 584篇 |
1999年 | 329篇 |
1998年 | 376篇 |
1997年 | 351篇 |
1996年 | 188篇 |
1995年 | 162篇 |
1994年 | 158篇 |
1993年 | 133篇 |
1992年 | 105篇 |
1991年 | 141篇 |
1990年 | 189篇 |
1989年 | 133篇 |
1988年 | 129篇 |
1987年 | 100篇 |
1986年 | 72篇 |
1985年 | 71篇 |
1984年 | 61篇 |
1983年 | 43篇 |
1982年 | 73篇 |
1980年 | 70篇 |
1970年 | 39篇 |
1968年 | 45篇 |
1938年 | 77篇 |
1937年 | 41篇 |
1934年 | 42篇 |
1932年 | 65篇 |
1930年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 23 毫秒
21.
22.
Introduction
Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies. 相似文献23.
Peter Angelos 《World journal of surgery》2009,33(4):609-611
24.
25.
Kentaroh Miyoshi Minoru Naito Tsuyoshi Ueno Shinji Hato Hideo Ino 《General thoracic and cardiovascular surgery》2009,57(11):629-632
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography
(PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was
well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity
for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal
tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant
potential of esophageal submucosal tumors. 相似文献
26.
27.
Megan A. O’Grady Kristina Wilson Jennifer J. Harman 《The journal of primary prevention》2009,30(6):716-731
The purpose of this study was to evaluate a single-session peer-led safer sex intervention, based on the Information-Motivation-Behavioral
Skills theoretical model, for college students residing in campus residence halls. Participants (N = 108) were assigned to either an hour long control or 5-module intervention session. Compared to the control condition,
the intervention increased participants’ information and women’s subjective norms about preventative behavior. Both the control
and intervention sessions increased intentions to perform preventative behaviors (e.g., keep condoms available). These preliminary
results suggest that this intervention is promising for increasing constructs associated with safer sexual behavior and could
easily be implemented by residence hall staff. 相似文献
28.
Lucio Lucchin Amleto D’Amicis Maria Gabriella Gentile Nino Carlo Battistini Maria Antonia Fusco Augusta Palmo Maurizio Muscaritoli Franco Contaldo Emanuele Cereda 《Mediterranean journal of nutrition and metabolism》2009,2(3):171-179
Aim and methods Nutrition, unhealthy lifestyles and cancer appear to be strictly related, but few authors have analysed the interest in dietary
information of cancer patients and their families. This survey was conducted in the Veneto area (Italy) to investigate the
concern of cancer patients and their family members about diet as a health tool before and after diagnosis of cancer.
Results Seven hundred and four questionnaires were collected: 380 from cancer patients and 324 from family members of cancer subjects.
Breast cancer (BC) was the most frequent disease for patients (61.8%) as well as families (26.5%). Generally, the importance
of having precise diet information after diagnosis is recognised by 40.3% of patients, with significant differences between
the various types of cancer: gastric and colon/rectum cancer (GCC) patients were more concerned than BC women about precise
information concerning a diet to follow immediately after diagnosis (p = 0.000, ODs = 3.10, CI 1.68–5.71) or during treatments (p = 0.001, ODs = 2.67, CI 1.46–4.89). The nutritional information is supplied to patients in 34% of cases and to relatives
in 30.3%, often from non-medical sources. In total healthcare workers (family doctor, oncologist, surgeon, dietician) represented
the exclusive source of dietary information for 24.9% of patients and 22.9% of family members. Diet after diagnosis changes
in 69.1% of GCC patients and in 39.2% of BC women. Relatives, particularly women, report difficulties preparing patients’
meals in 30.7% of cases, changes in the eating habits of the entire family in 29.9% and discontent connected with patients
diet in 13.9%. The concern about proper nutrition after diagnosis increases more in GCC subjects (p < 0.025) when compared to BC subjects and in patients with more recent diagnosis (p < 0.041) when compared with patients with diagnosis >5 years ago, while in family members the interest in diet after diagnosis
increases more in women than in men (p < 0.030) without other differences regarding the degree of relationship, type of cancer or diagnosis time. Relatives (92.7%)
have more interest in nutritional education than patients (74.9%). Cancer patients <65 years were more interested in educational
initiatives concerning nutrition (p = 0.000, ODs = 4.46, CI 2.6–7.4) than older patients (>65 years) and female subjects were more concerned than male patients
(p = 0.008, ODs = 2.11, CI 1.2–3.6).
Conclusions The interest in the dietary knowledge and in educational initiatives concerning nutrition is high in cancer patients and their
relatives, although it decreases with the age. The poor attention paid to nutrition of cancer patients by various healthcare
workers deserves consideration, since the psychophysical wellbeing and perhaps also survival of cancer patients can be improved
by correct dietary management, as well as, naturally, by the principal treatments themselves. 相似文献
29.
Henry Cisneros 《AIDS and behavior》2007,11(2):7-8
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference. 相似文献
30.