全文获取类型
收费全文 | 1564篇 |
免费 | 150篇 |
出版年
2023年 | 9篇 |
2022年 | 13篇 |
2021年 | 42篇 |
2020年 | 31篇 |
2019年 | 39篇 |
2018年 | 50篇 |
2017年 | 53篇 |
2016年 | 52篇 |
2015年 | 92篇 |
2014年 | 88篇 |
2013年 | 100篇 |
2012年 | 108篇 |
2011年 | 129篇 |
2010年 | 63篇 |
2009年 | 69篇 |
2008年 | 66篇 |
2007年 | 71篇 |
2006年 | 75篇 |
2005年 | 59篇 |
2004年 | 52篇 |
2003年 | 52篇 |
2002年 | 54篇 |
2001年 | 58篇 |
2000年 | 45篇 |
1999年 | 38篇 |
1998年 | 22篇 |
1997年 | 15篇 |
1996年 | 17篇 |
1995年 | 13篇 |
1994年 | 14篇 |
1993年 | 11篇 |
1992年 | 14篇 |
1991年 | 17篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1968年 | 5篇 |
1966年 | 1篇 |
排序方式: 共有1714条查询结果,搜索用时 15 毫秒
1.
Francisco Gutirrez‐Corchero M. Victoria Arruga Lourdes Sanz Cristina García M. Angeles Hernndez Francisco Campos 《Molecular ecology resources》2002,2(1):75-77
FTA® cards were used for long‐term storage of avian blood samples. Blood DNA was extracted by a simple method and used in PCR for sex identification of adult and nestling Great Grey Shrikes Lanius excubitor. 相似文献
2.
David Gutirrez‐Larruscain Santiago Andrs‐Snchez Enrique Rico María Montserrat Martínez‐Ortega 《植物分类学报:英文版》2019,57(1):42-54
Forty-five populations of Pentanema corresponding to seven species included in the Pentanema conyzae clade have been studied using AFLP fingerprinting. The results show that allopolyploidization could have been involved in the diversification of this group, specifically in species P. langeanum and P. maletii. Molecular data confirm the presence of P. britannicum in the Iberian Peninsula and key steps are provided to identify the species that are morphologically the most challenging. 相似文献
3.
Distinct effects of climate warming on populations of silver fir (Abies alba) across Europe
下载免费PDF全文
![点击此处可从《Journal of Biogeography》网站下载免费的PDF全文](/ch/ext_images/free.gif)
4.
J Yajeya A Colino J Criado-Gutiérrez A Fernández de Molina 《Revista Espanola de Fisiología》1987,43(2):185-189
The commissural component of the stria terminalis (S. T.) was studied in Equi-Thesin (92.7 mg/kg) anesthetized rats after their exposure in the caudothalamic surface of both hemispheres. Two types of connection between right and left S. T. across the anterior commissure are described: A "direct" connection set up by fibres that run through the S. T. and join the contralateral S. T., and another "indirect" component, formed by cell axons that receive excitatory synaptic contacts from fibres running in the S. T. 相似文献
5.
6.
Liquid and lyophilized samples of Lachesis muta venom were stored at different temperatures and for different periods of time, and analyzed by polyacrylamide gel electrophoresis (PAGE) and immunoelectrophoresis. Only slight variations were evident when three pools of freeze-dried venom, that had been kept at -30 degrees C for several months were compared with fresh venom. These results suggest that L. muta venom is not altered drastically when stored under these conditions. 相似文献
7.
O Gutiérrez E René J P Accary T Lehy J P Laigneau J A Chayvialle S Bonfils 《Regulatory peptides》1986,14(2):133-143
The behaviour of gastrin (G) cells and somatostatin (D) cells in endoscopic antral biopsies and that of intraluminal gastrin (ILG) and somatostatin (ILS) release in the gastric juice were investigated in three groups of patients: control subjects, duodenal ulcer (DU) patients and DU patients treated by a superselective vagotomy (SSV). G and D cell densities were correlated in the three groups of subjects. The G/D cell ratio was significantly increased in SSV patients (P less than 0.001) as compared to control and DU patients. No correlation was found between gastrin or somatostatin cell densities and basal intraluminal levels of the two peptides. ILG output was significantly higher in DU patients than in control or SSV patients (P less than 0.001). ILS output was also higher in DU patients than in controls (P less than 0.001) and in SSV patients (P less than 0.05). It was also significantly augmented in SSV (P less than 0.001) as compared to control patients. ILG and ILS concentrations were only correlated in controls. Within each of the three groups of subjects, ILG and ILS release varied in function of the gastric juice pH. Our results emphasize the necessity to consider the intragastric pH as well as the physiological or pathological state to study intraluminal peptides in man. 相似文献
8.
Comparative study of the edema-forming activity of Costa Rican snake venoms and its neutralization by a polyvalent antivenom 总被引:3,自引:0,他引:3
J M Gutiérrez G Rojas B Lomonte J A Gené L Cerdas 《Comp. Biochem. Physiol. C, Comp. Pharmacol. Toxicol.》1986,85(1):171-175
The edema-forming activity of eight Costa Rican crotaline snake venoms and its neutralization by a polyvalent antivenom were studied using the mouse footpad test. All of the venoms induced edema, the highest activity being present in the venoms of Bothrops lateralis and Bothrops picadoi. When experiments were performed with preincubation of venom and antivenom, neutralization of edema was poor. Moreover, it was observed that, with some venoms, edema increased when large doses of antivenom were used. This effect was also observed when some venoms were incubated with coral snake antivenom, suggesting that venoms may release some pharmacologically active component(s) from antivenom, since the latter contains traces of alpha-2 and beta globulins. Based on these findings, an alternative approach to the study of the neutralization of edema was used; in this new method, antivenom was injected i.v. before venom administration, thereby avoiding preincubation. With this technique, a much better neutralization of edema was observed, although with some venoms it was still poor. Venoms contain low molecular weight factors which induce edema, suggesting that lack of immunogenicity of some components may cause a poor neutralization. However, such components are responsible for only a minor portion of the edema induced by crude venoms. It is suggested that experiments in which venom and antivenom are preincubated preincubated in testing the neutralization of edema should be avoided, and that a more adequate approach may be an independent inoculation of venom and antivenom. 相似文献
9.
10.
Recently, pipecolic acid (PA) has been involved in the functioning of the GABAergic system. In the present work we have studied the effect of PA on GABA uptake and release in cerebral cortex slices. PA (100 M) was able to increase the release of [3H]GABA (90%) stimulated by mild depolarization with 15 mM potassium. If during the labeling of the tissue with [3H]GABA, -alanine was present, PA also enhanced the release (42%). However, when nipecotic acid was present instead -alanine, no stimulation of [3H]GABA release by potassium was observed neither in the control nor in the presence of PA. Spontaneous release was not affected by PA in any of the experimental conditions tested. In uptake experiments, only when -alanine was present in the medium PA significantly diminished the uptake (36%) of [3H]GABA. These results suggest that the effect of PA is mostly at the presynaptic level, inhibiting the neuronal GABA uptake and/or enhancing its release. 相似文献