全文获取类型
收费全文 | 59448篇 |
免费 | 5468篇 |
国内免费 | 1533篇 |
专业分类
耳鼻咽喉 | 435篇 |
儿科学 | 1613篇 |
妇产科学 | 1021篇 |
基础医学 | 2871篇 |
口腔科学 | 1465篇 |
临床医学 | 7719篇 |
内科学 | 8784篇 |
皮肤病学 | 642篇 |
神经病学 | 2433篇 |
特种医学 | 1531篇 |
外国民族医学 | 8篇 |
外科学 | 4569篇 |
综合类 | 8803篇 |
现状与发展 | 2篇 |
一般理论 | 1篇 |
预防医学 | 10896篇 |
眼科学 | 495篇 |
药学 | 6974篇 |
113篇 | |
中国医学 | 3809篇 |
肿瘤学 | 2265篇 |
出版年
2024年 | 339篇 |
2023年 | 1527篇 |
2022年 | 2907篇 |
2021年 | 3573篇 |
2020年 | 3339篇 |
2019年 | 2796篇 |
2018年 | 2743篇 |
2017年 | 2400篇 |
2016年 | 2438篇 |
2015年 | 2280篇 |
2014年 | 4881篇 |
2013年 | 4872篇 |
2012年 | 3984篇 |
2011年 | 4081篇 |
2010年 | 3181篇 |
2009年 | 2852篇 |
2008年 | 2637篇 |
2007年 | 2644篇 |
2006年 | 2033篇 |
2005年 | 1730篇 |
2004年 | 1430篇 |
2003年 | 1210篇 |
2002年 | 879篇 |
2001年 | 808篇 |
2000年 | 613篇 |
1999年 | 586篇 |
1998年 | 465篇 |
1997年 | 399篇 |
1996年 | 353篇 |
1995年 | 312篇 |
1994年 | 301篇 |
1993年 | 230篇 |
1992年 | 239篇 |
1991年 | 202篇 |
1990年 | 159篇 |
1989年 | 140篇 |
1988年 | 112篇 |
1987年 | 102篇 |
1986年 | 95篇 |
1985年 | 110篇 |
1984年 | 99篇 |
1983年 | 62篇 |
1982年 | 57篇 |
1981年 | 52篇 |
1980年 | 55篇 |
1979年 | 25篇 |
1978年 | 38篇 |
1977年 | 25篇 |
1976年 | 18篇 |
1975年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
背景 现有研究表明,抑郁是影响大学生心理健康的重要原因之一。因此,有必要采取有效的方法干预大学生抑郁情绪。目的 探究循经冥想训练干预大学生抑郁情绪的效果。方法 2018年4月,在以循经冥想课题组的名义招募的某大学本科生中,发放抑郁自评量表(SDS),筛选出自愿接受循经冥想训练的60人。根据受试者性别比例,采用随机数字表法随机分为循冥组和静息组。其中循冥组30人进行4周循经冥想训练,在开始循经冥想训练前和循经冥想训练结束后填写SDS并进行E-prime情绪图片评价任务。静息组30人进行静息训练,其余与循经冥想组相同。比较两组前测、后测及前后测差值有无差异。结果 两组前测积极、中性、消极情绪图片评分比较,差异均无统计学意义(P>0.05);两组后测积极、中性、消极情绪图片评分比较,差异均无统计学意义(P>0.05);两组积极、中性、消极情绪图片评分前测与后测差值比较,差异均无统计学意义(P>0.05)。静息组前测与后测积极、中性、消极情绪图片评分比较,差异均无统计学意义(P>0.05)。循冥组后测积极情绪图片评分低于前测、消极情绪图片评分高于前测(P<0.05)。两组前测SDS评分比较,差异无统计学意义(P>0.05)。循冥组后测SDS评分低于静息组,SDS评分前测与后测差值高于静息组(P<0.05)。循冥组和静息组后测SDS评分均低于前测(P<0.05)。结论 循经冥想能降低大学生抑郁水平,可能是由于其能够改变人的情绪认知评价和睡眠质量,使人变得平和。 相似文献
72.
73.
《European journal of surgical oncology》2021,47(12):3105-3112
BackgroundDetails of perioperative outcomes and survival after gastric cancer surgery in prior transplant recipients have received minimal research attention.MethodsWe performed an observational cohort study using the database of 20,147 gastric cancer patients who underwent gastrectomy at a single gastric cancer center in Korea. Forty-one solid organ recipients [kidney (n = 35), liver (n = 5), or heart (n = 1)] were matched with 205 controls using propensity score matching.ResultsOperation time, blood loss, and postoperative pain were similar between groups. Short-term complication rates were similar between transplantation and control groups (22.0% vs. 20.1%, P = 0.777). Transplantation group patients with stage 1 gastric cancer experienced no recurrence, while those with stage 2/3 cancer had significantly higher recurrence risk compared to the controls (P = 0.049). For patients with stage 1 cancer, the transplantation group had a significantly higher rate of non-gastric cancer-related deaths compared to the controls (19.2% vs. 1.4%, P = 0.001). For those with stage 2/3 cancer, significantly lower proportion of the transplantation group received adjuvant chemotherapy compared to the control group (26.7% vs. 80.3%, P < 0.001). The transplantation group had a higher (albeit not statistically significant) rate of gastric cancer-related deaths compared to the controls (40.0% vs. 18.0%, P = 0.087).ConclusionTransplant recipients and non-transplant recipients exhibited similar perioperative and short-term outcomes after gastric cancer surgery. From long-term outcome analyses, we suggest active surveillance for non-gastric cancer-related deaths in patients with early gastric cancer, as well as strict oncologic care in patients with advanced cancer, as effective strategies for transplant recipients. 相似文献
74.
《Obstetrics, Gynaecology and Reproductive Medicine》2020,30(10):315-320
The incidence of obesity in the UK is increasing, meaning more women booking for antenatal care are obese. Obesity poses many additional risks to the mother and fetus during pregnancy, labour and the puerperium. Care of obese women should aim to reduce these risks. This article will discuss the risks associated with obesity in pregnancy and the management of obese women, from preconception through to completion of the postnatal period. 相似文献
75.
There is some evidence suggesting that Parkinson's disease (PD) patients exhibit lower body weight when compared to age-matched healthy subjects. Low body mass index (BMI) is correlated with low bone mineral density, both of which are major risk factors for hip fractures. Possible determinants of weight loss in PD patients include hyposmia, impaired hand-mouth coordination, difficulty chewing, dysphagia, intestinal hypomotility, depression, decreased reward processing of dopaminergic mesolimbic regions, nausea, and anorexia as the side effects of medication, and increased energy requirements due to muscular rigidity and involuntary movements. It is unclear whether PD patients in general, or only a subgroup of those affected, definitely show lower BMI in the advanced stages of the disease. We therefore recommend that the body weight of PD patients be monitored monthly as the disease progresses, and that a patient's nutrition should be supplemented with sufficient amounts of vitamin D and calcium to reduce the risk of hip fractures and strengthen bone density. Because meal times may coincide with unpredictable off periods associated with akinesia and impaired hand-mouth coordination, PD patients also need flexible food schedules that accommodate the associated symptoms of this disease. 相似文献
76.
M. Parikh M.D. J. Duncombe M.B. B.S. G.A. Fielding M.D. 《Surgery for obesity and related diseases》2006,2(5):99-522
BACKGROUND: Many mild-to-moderately obese individuals (body mass index [BMI] 30-35 kg/m(2)) have serious diseases related to their obesity. Nonoperative therapy is ineffective in the long term, yet surgery has never been made widely available to this population. METHODS: Between 1996 and 2004, 93 patients with a BMI of 30-35 kg/m(2) underwent laparoscopic adjustable gastric banding with the LAP-BAND. All patients were referred by their primary physician, entered into a comprehensive bariatric surgery program at one Australian center, and operated on by one surgeon. Data on all patients were collected prospectively and entered into an electronic registry. The study parameters included preoperative age, gender, BMI, presence of co-morbidities, percentage of excess weight loss, and resolution of co-morbidities. RESULTS: The mean age was 44.6 years (range 16-76), mean weight was 98 kg, and the mean BMI was 32.7 kg/m(2) (range 30-34). Of the 93 patients, 42 (45%) had co-morbidities, including asthma, diabetes, hypertension, and sleep apnea. The proportion of patients in follow-up was 79%, 85%, and 89% at 1, 2, and 3 years, respectively. The mean weight was reduced to 71 kg at 1 year, 72 kg at 2 years, and 72 kg at 3 years. The mean BMI was reduced to 27.2 +/- 2.2, 27.3 +/- 3.1, and 27.6 +/- 3.7 kg/m(2), respectively, and the mean percentage of excess weight loss was 57.9% +/- 24.5%, 57.6 +/- 29.3%, and 53.8% +/- 32.8% at 1, 2, and 3 years, respectively. At 3 years, the BMI was 18-24 kg/m(2) in 34%, 25-29 kg/m(2) in 51%, and 30-35 kg/m(2) in 10%. At 3 years, the percentage of excess weight loss was <25% in 10%, 25-50% in 24%, 50-75% in 51%, and >75% in 10%. The co-morbidities improved or completely resolved in most patients. No mortality occurred. CONCLUSION: We are very encouraged by this series of low BMI patients treated with the LAP-BAND. Their weight loss has been good, the complications have been minimal, and the co-morbidities have partially or wholly resolved. With additional study, it is reasonable to expect the weight guidelines for bariatric surgery to be altered to include patients with a BMI of 30-35 kg/m(2). 相似文献
77.
影像学评估在耳蜗植入术中的价值 总被引:2,自引:0,他引:2
目的:评价影像学检查在耳蜗植入术中的价值。方法:37例感音性神经性聋患者术前常规行颞骨HRCT及MRI检查,术后行改良斯氏位X线拍片,其中5例术后行CT复查。结果:CT显示2例Mondini畸形(4耳),2例前庭导水管扩张(4耳),1例迷路骨化(1耳),1例内听道狭窄(2耳)。MRI显示Mondini畸形3例(6耳),前庭导水管扩张2例(4耳),1例并内淋巴囊扩张(2耳),2例迷路纤维化(2耳)。术后改良斯氏位X线拍片显示植入电极形态、位置良好。CT显示1例电极滑脱。结论:CT及MRI对耳蜗植入术术前评估具有重要价值,改良斯氏位X线拍片结合CT对术后评估更有意义。 相似文献
78.
目的:探讨血管生成、细胞增殖指数、DNA倍性在胰腺导管癌发生、发展中的作用及临床意义。方法:对29例胰腺导管癌和7例慢性胰腺炎患者的石蜡包埋标本作苏木精鄄伊红(HE)染色,CD34、Ki67免疫组织化学染色,镜下计算微血管密度(MVD)及Ki67阳性细胞比例,同时用流式细胞仪(FCM)检测细胞核DNA倍性,计算异倍体出现率及S期比例,并结合临床病理资料对各项指标作相关分析。结果:胰腺导管癌和慢性胰腺炎都有较多的新生血管。MVD值在胰腺导管癌高、中、低分化3组之间差异无显著性。按肿瘤直径分为≤1.5cm、1.6~2.9cm、≥3cm3组,此3组间MVD值、Ki67阳性细胞百分率、DNA异倍体出现率及肿瘤周围有无浸润的差异都非常显著(P<0.01)。肿瘤越大,MVD值、Ki67阳性细胞百分率及DNA异倍体出现率越高。结论:胰腺导管癌的发生、发展伴血管生成和DNA合成增加,联合测定MVD、Ki67阳性细胞百分率、DNA倍型可能为胰腺导管癌临床预后预测提供辅助参考指标。 相似文献
79.
邹城市预防艾滋病健康教育效果评价 总被引:6,自引:4,他引:2
目的评价预防艾滋病健康教育与行为干预效果。方法采用问卷方式对社区居民进行预防艾滋病信息的可及性及知信行的调查。结果社区居民艾滋病知晓率为97.41%,熟悉艾滋病传播途径的87.78%,62.78%的认为艾滋病病人或感染者和正常人享有一样的入学/就业权,38.70%的人愿意与感染艾滋病的同事继续共事,60.19%的人愿意与感染艾滋病的家人继续共同生活,最近3次性行为100%使用安全套者为26.48%,82.04%的人有医疗用血安全意识,64.81%的人有医疗器械安全意识。最想获取艾滋病预防措施、传播途径、病理知识、症状表现、治疗方法、检测途径及检测方法、疫情信息,新闻、电视公益广告、专题报道、反映艾滋病病人生活的电影或电视剧、科普材料、大型公益演出人们最喜欢。结论政府重视,多部门合作,组织机构健全,宣传教育广泛,干预措施到位,成效显著。 相似文献
80.
By substituting the saturated vapour phase tension of the pure normal hydrocarbons described by the Clausius-Clapeyron law into the accepted expression of the specific retention volume (Vg,T), a theoretically coherent and relatively simple mathematical evidence of the elution behaviour of the homologous members has been deduced. It gives exponential retention time dependence on carbon number for isothermal, and nearly equidistant (i.e., approximately linear retention-time dependence on carbon number) elution for linear temperature programmed gas chromatographic runs. The final equations are in close correlation with the experimental results. Special emphasis is placed on the fact that a good approximation—not strict physical laws—have been found. 相似文献