全文获取类型
收费全文 | 6720篇 |
免费 | 311篇 |
国内免费 | 9篇 |
专业分类
7040篇 |
出版年
2023年 | 13篇 |
2022年 | 31篇 |
2021年 | 68篇 |
2020年 | 42篇 |
2019年 | 61篇 |
2018年 | 95篇 |
2017年 | 82篇 |
2016年 | 111篇 |
2015年 | 188篇 |
2014年 | 245篇 |
2013年 | 506篇 |
2012年 | 401篇 |
2011年 | 405篇 |
2010年 | 260篇 |
2009年 | 275篇 |
2008年 | 453篇 |
2007年 | 435篇 |
2006年 | 416篇 |
2005年 | 475篇 |
2004年 | 465篇 |
2003年 | 436篇 |
2002年 | 396篇 |
2001年 | 51篇 |
2000年 | 54篇 |
1999年 | 58篇 |
1998年 | 98篇 |
1997年 | 71篇 |
1996年 | 79篇 |
1995年 | 80篇 |
1994年 | 51篇 |
1993年 | 61篇 |
1992年 | 50篇 |
1991年 | 45篇 |
1990年 | 33篇 |
1989年 | 37篇 |
1988年 | 24篇 |
1987年 | 36篇 |
1986年 | 28篇 |
1985年 | 24篇 |
1984年 | 36篇 |
1983年 | 32篇 |
1982年 | 40篇 |
1981年 | 31篇 |
1980年 | 23篇 |
1979年 | 28篇 |
1978年 | 27篇 |
1977年 | 17篇 |
1976年 | 21篇 |
1975年 | 9篇 |
1973年 | 8篇 |
排序方式: 共有7040条查询结果,搜索用时 15 毫秒
31.
Kazuo Imai Norihito Tarumoto Kiyoko Amo Makoto Takahashi Naoya Sakamoto Atsushi Kosaka Yasuyuki Kato Kei Mikita Jun Sakai Takashi Murakami Yutaka Suzuki Shigefumi Maesaki Takuya Maeda 《Parasitology international》2018,67(1):34-37
Cutaneous leishmaniasis (CL) is gaining attention as a public health problem. We present two cases of CL imported from Syria and Venezuela in Japan. We diagnosed them as CL non-invasively by the direct boil loop-mediated isothermal amplification method and an innovative sequencing method using the MinION? sequencer. This report demonstrates that our procedure could be useful for the diagnosis of CL in both clinical and epidemiological settings. 相似文献
32.
33.
Summary The frequency of Y chromatin, visualized as fluorescent bodies in cell nuclei from lymphocytes in blood smears, was signficantly less in newborn males than in three-month-old male infants and adults. The frequency of Y chromatin-positive cells on day 0 was 36.16±9.11% and then increased daily. At one month after birth the frequency was 55.07±9.29%, which was not significantly different from that in adult males (57.08±5.97%). 相似文献
34.
Makoto Tsuchiya 《Journal of experimental marine biology and ecology》1980,47(3):203-222
Seasonal changes in the amount of biodeposit (faeces and pseudofaeces) produced by the mussel Mytilus edulis L., which is one of the representative suspension-feeders in the rocky intertidal and shallow subtidal regions of Mutsu Bay, were studied in the laboratory. The effects of water temperature, light, food concentration, flow rate, body size, age, and spawning on biodeposit production were investigated. More biodeposit was produced in summer than in other seasons. Throughout the year, the amount of biodeposit was positively correlated with body size. Relatively more biodeposit was produced by smaller than by larger individuals. A M. edulis population living in one square meter was estimated to produce 9.20 kg of faeces and 2.71 kg of pseudofaeces per year (dry wt). More biodeposit was produced at water temperatures of 17.6–20.2° C than at 4.5–7.6° C and 25.2–26.0° C. The optimum temperature for biodeposit production was found to be ≈ 20.0 °C. When kept in the dark, M. edulis produced more biodeposit than in the light. When food concentration is increased, more psuedofaeces are produced; the amount of faeces, however, remains constant. With increasing flow rate, the amount o f biodeposit per h increased but the biodeposition rate decreased. Larger amounts of faeces and smaller amounts of pseudofaeces were produced by younger mussels than by older ones of a similar size. Spawning also affected biodeposit production. 相似文献
35.
From the root bark of Hovenia dulcis Thunb. and H. tommentella (Makino) Nakai (Rhamnaceae), three peptide alkaloids, frangulanine, hovenins-A and -B have been isolated. Hovenin-A has been shown to be des-N-methylfrangulanine (II). 相似文献
36.
Furihata Ryuji Kizuki Jun Yamano Yuya Mizoguchi Yasuhide Nakajima Suguru Nagai Kou Kaneko Yoshiyuki Yamada Koju Suzuki Masahiro Uchiyama Makoto 《Sleep and biological rhythms》2020,18(2):155-157
Sleep and Biological Rhythms - A 39-year-old married woman was referred to a psychiatry outpatient clinic for treatment of major depressive disorder (MDD). The dose of zolpidem she had been taking... 相似文献
37.
38.
Makoto Kurano Keiko Yasukawa Hitoshi Ikeda Junken Aoki Yutaka Yatomi 《Free radical research》2013,47(8):892-900
Depending on its redox status, albumin is known to exist as two forms: reduced albumin or human mercaptalbumin (HMA); and oxidised albumin or human nonmercaptalbumin (HNA). The ratio of HNA to HMA is reportedly elevated in several diseases. Since lipid mediators, such as eicosanoids and lysophospholipids, are typically bound to albumin, we examined the possible preferences of lipid mediators for HNA or HMA. We observed that DHA-derived and EPA-derived eicosanoids preferred to be bound to HMA, while the levels of lysophospholipid mediators, such as lysophosphatidic acids and sphingosine 1-phosphate, were higher in the HNA fraction. Considering the bioactivities reported in previous basic studies, these results suggest that proatherosclerotic lipid mediators might generally prefer HNA, while antiatherosclerotic ones might prefer HMA. Oxidative stress affects the redox status of albumin, which might modulate the dynamism of lipid mediators. This pathway might be partly involved in the association between oxidation and atherosclerosis. 相似文献
39.
Qiang Li Kazuhiro Hori Yoshitomo Minagi Takahiro Ono Yong-jin Chen Jyugo Kondo Shigehiro Fujiwara Kenichi Tamine Hirokazu Hayashi Makoto Inoue Yoshinobu Maeda 《PloS one》2013,8(8)
Background
Swallowing dysfunction (also known as dysphagia), which results in a deterioration of nutritional intake, slows rehabilitation and causes aspiration pneumonia, is very common following neurological impairments. Although videofluorographic (VF) examination is widely used for detecting aspiration, an objective and non-invasive method for assessing swallowing function has yet to be established because of a lack of adequate devices and protocols. In this paper, a bend sensor whose resistance is altered by bending was introduced to monitor swallowing-related laryngeal movement.Methods
Six healthy male volunteers were recruited in the present study. Specific time points on the signal waveform produced by the bend sensor were defined to describe laryngeal movement by differential analysis. Additionally, the physiological significance of the obtained waveform was confirmed by analyzing the sequential correlations between the signal waveform from the bend sensor and hyoid bone kinetics simultaneously recorded by VF.Results
Seven time points were successfully defined on the signal waveform to reference laryngeal movement. Each time point was well correlated with certain VF events, with evidence of no significant time lags, and there were positive correlations between waveform time points and matched VF events. Furthermore, obvious similarities were noticed between the duration of each phase on the signal waveform and the duration of the matched hyoid bone activity.Conclusions
The present monitoring system using a bend sensor might be useful for observing the temporal aspects of laryngeal movement during swallowing, and it was well coordinated with hyoid bone movement. 相似文献40.
Ayaka Furukawa Sumire Mitarai Mitsuhiro Takagi Yuuhei Yoshida Makoto Ozawa Akira Taneno Eisaburo Deguchi 《Microbiology and immunology》2020,64(5):387-391
Because broad genetic diversity has recently been detected in Torque teno sus viruses (TTSuV1 and TTSuVk2), the viral genome detection method needs to be improved to understand the prevalence of these viruses. Here, we established single PCR-based detection methods for the TTSuV1 and TTSuVk2a genomes with newly designed primer pairs and applied them to investigate the prevalence of TTSuV1 and TTSuVk2a in Japanese pig populations. The results revealed that 98.2% and 81.7% of the pig farms tested positive for the TTSuV1 and TTSuVk2a genomes, respectively, indicating that both TTSuV1 and TTSuVk2a are widespread in Japan. 相似文献