全文获取类型
收费全文 | 5426篇 |
免费 | 612篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 111篇 |
妇产科学 | 195篇 |
基础医学 | 594篇 |
口腔科学 | 137篇 |
临床医学 | 1313篇 |
内科学 | 1128篇 |
皮肤病学 | 71篇 |
神经病学 | 342篇 |
特种医学 | 192篇 |
外科学 | 764篇 |
综合类 | 55篇 |
预防医学 | 294篇 |
眼科学 | 111篇 |
药学 | 323篇 |
中国医学 | 7篇 |
肿瘤学 | 398篇 |
出版年
2023年 | 81篇 |
2022年 | 41篇 |
2021年 | 73篇 |
2020年 | 64篇 |
2019年 | 49篇 |
2018年 | 142篇 |
2017年 | 152篇 |
2016年 | 153篇 |
2015年 | 166篇 |
2014年 | 170篇 |
2013年 | 168篇 |
2012年 | 163篇 |
2011年 | 176篇 |
2010年 | 154篇 |
2009年 | 180篇 |
2008年 | 196篇 |
2007年 | 193篇 |
2006年 | 198篇 |
2005年 | 208篇 |
2004年 | 194篇 |
2003年 | 185篇 |
2002年 | 169篇 |
2001年 | 195篇 |
2000年 | 177篇 |
1999年 | 197篇 |
1998年 | 94篇 |
1997年 | 110篇 |
1996年 | 98篇 |
1995年 | 85篇 |
1994年 | 84篇 |
1993年 | 70篇 |
1992年 | 146篇 |
1991年 | 129篇 |
1990年 | 160篇 |
1989年 | 138篇 |
1988年 | 107篇 |
1987年 | 119篇 |
1986年 | 86篇 |
1985年 | 86篇 |
1984年 | 70篇 |
1983年 | 56篇 |
1982年 | 41篇 |
1979年 | 57篇 |
1978年 | 41篇 |
1977年 | 35篇 |
1976年 | 32篇 |
1974年 | 41篇 |
1973年 | 38篇 |
1972年 | 40篇 |
1971年 | 35篇 |
排序方式: 共有6055条查询结果,搜索用时 31 毫秒
1.
2.
Fluid role boundaries: exploring the contribution of the advanced nurse practitioner to multi‐professional palliative care
下载免费PDF全文
![点击此处可从《Journal of clinical nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
3.
Mitsuru Takahashi Hidenobu Takahashi Tetsushi Itoh Masaharu Nomura Akihiko Ogata Sachio Maehara Harubumi Kato 《Annals of thoracic and cardiovascular surgery》2006,12(1):50-52
Postoperative empyema and aspergillosis were diagnosed in a 66-year-old man. Since non-operative therapy was not effective, we performed surgery. On the 8th postoperative day, a covered Ultraflex expandable stent (Boston Scientific, Galway, Ireland) was implanted to make a one-way airway for blocking a major air leak from a bronchopleural fistula causing respiratory distress. His general condition improved gradually, and he was discharged 30 days after stenting. In conclusion, we used a covered Ultraflex expandable stent to make an airway to block an air leak. This may be a new application for this stent. 相似文献
4.
5.
MR compatibility of Guglielmi detachable coils 总被引:6,自引:0,他引:6
6.
N Ogata 《Brain research》1987,403(2):225-233
The action of gamma-aminobutyric acid (GABA) in the supraoptic nucleus was investigated using guinea pig brain slices. GABA produced a membrane depolarization accompanied by a decrease in the input resistance. The action of GABA was concentration-dependent throughout a wide range of concentrations (10(-7)-10(-3) M). In none of the cells examined, a membrane hyperpolarization was observed. The reversal potential for the depolarization induced by GABA was about 25 mV positive to the resting membrane potential. The amplitude of the GABA-induced depolarization was increased to 1.5 X the control by reducing the external Cl- from 134.2 mM to 10.2 mM. The action of GABA was readily antagonized by relatively low concentrations of bicuculline (10(-5) M). The action of GABA in the hippocampus or in the anterior hypothalamus was markedly different from that in the supraoptic nucleus, i.e. GABA produced both depolarizing and hyperpolarizing responses in the hippocampus and consistently a hyperpolarization in the anterior hypothalamus. The depolarizing but not the hyperpolarizing response in the hippocampus was selectively blocked by picrotoxin (2 X 10(-5) M) or by bicuculline (10(-5) M). The depolarizing component was dependent on the external Cl- concentration and had a reversal potential similar to that of the depolarization induced by GABA in the supraoptic nucleus. The hyperpolarizing component was resistant to bicuculline and had a reversal potential about 30 mV negative to the resting membrane potential.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
7.
BEVERLY HAVENS RN MN MPH INGRID SWENSON RN DPH 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1986,15(5):406-411
Seventy-four 8th- and 10th-grade students attending a private girls' school in Hawaii were queried about their perceptions of and preparation for menstruation using a questionnaire administered in a health education class. Eighty percent had already started menstruating. The most frequently cited perceptions by the respondents referred to both the inconveniences and the normalcy of menstruation. Many were first informed about menstruation by their mothers and stated that they also first informed their mothers when they started menstruating. Surprise, fear, and embarrassment were common initial reactions, while strong negative or positive emotions were more rare. Only 35% wanted boys and girls together during class discussion, but 89% stated that boys needed to be informed about menstruation. The most frequent reasons cited for noncoed settings were the girls' concern about their comfort in openly discussing menstruation. Thirty-eight percent thought parents should inform other siblings when they started menstruation, although almost half gave specific conditions the parents should consider. The majority thought the fifth to sixth grades were the best times to introduce menstruation content. 相似文献
8.
Masana Ogata Toyohiro Taguchi 《International archives of occupational and environmental health》1986,58(2):121-129
Summary A new method for the direct determination of hippuric acid (HA) and o-, m- and p-methylhippuric acids (MHAs) in the urine, metabolites of toluene and o-, m- and p-xylenes by high performance liquid chromatography (HPLC) is described. A stainless-steel column packed with silica gel having dinitrophenyl residue and a mixed solution of methanol/water/acetic acid (80/20/0.2) containing tetra-n-butylammonium bromide (0.2% w/v) as mobile phase was used. Concentrations of HA and MHAs were estimated from their peak height at a wave length of 225 nm. Urine can be analyzed directly without solvent extraction or pretreatment to obtain complete separation of HA and o-, m- and p-MHAs. Urine samples from male workers exposed to toluene or xylenes were analyzed for HA or MHAs. The urinary levels of HA and MHAs increased by exposure to toluene and xylenes in proportion to the environmental concentrations of the solvents, although there is a considerable variation in metabolite concentrations. The slope of regression line between toluene and HA and that between m-xylene and m-MHA were similar. The urinary concentrations of HA and MHAs corresponding to 100 ppm (TLV) of toluene was 2.35 g/g creatinine and that of m-MHA corresponding to 100 ppm (TLV) of m-xylene was 2.05 g/g creatinine. The warning levels of the urinary metabolite concentrations of a group of workers and that of an individual worker corresponding to TLV of organic solvent concentration is discussed. 相似文献
9.
Y Moizumi Y Abe M Hata Y Tsuru I Suzuki Y Ogata 《Kyobu geka. The Japanese journal of thoracic surgery》1990,43(13):1052-1055
The centrifugal pump (bio-pump) as a temporary shunt during the operation of the descending thoracic aortic aneurysms was used as effective means of providing adequate circulation to the lower body. But in the acute excessive bleeding, estimates of the flow to the abdominal viscera as well as spinal cord are variable. We employed bio-pump with an interposed soft reservoir under low dose systemic heparinization in 2 cases of the descending thoracic aortic aneurysms. Both cases had been maintained adequate flow and perfusion pressure in the time of acute excessive hemorrhage, and there were no evidence of the organ failures due to microembolism. Furthermore, postoperative hemorrhage by using low dose heparin seemed to be unrisky. Compared with the previous method, bio-pump with an interposed soft reservoir provides adequate circulation to the lower body even if acute excessive bleeding occurred. 相似文献
10.
Roberto Civitelli M.D. Eturo Ogata Louis V. Avioli Gary Stein Samuel Edelstein John A. Eisman Yasuho Nishii Hajime Orimo Jane Lian Takuo Fujita Yasufumi Hayashi Shigeaki Kato Tadashi Kobayashi Hirotoshi Morii Rikushi Morita Toshitaka Nakamura Yoshiki Seino Masataka Shiraki Tatsuo Suda Naoyuki Takahashi Hideaki Takahashi Tastuhiko Tanisawa Akifumi Tokita 《Calcified tissue international》1995,57(6):409-414