全文获取类型
收费全文 | 51551篇 |
免费 | 3949篇 |
国内免费 | 14篇 |
专业分类
55514篇 |
出版年
2023年 | 247篇 |
2021年 | 398篇 |
2020年 | 349篇 |
2019年 | 357篇 |
2018年 | 1041篇 |
2017年 | 1040篇 |
2016年 | 1120篇 |
2015年 | 973篇 |
2014年 | 1141篇 |
2013年 | 2044篇 |
2012年 | 3319篇 |
2011年 | 3729篇 |
2010年 | 1956篇 |
2009年 | 1307篇 |
2008年 | 3064篇 |
2007年 | 3121篇 |
2006年 | 2940篇 |
2005年 | 2585篇 |
2004年 | 2501篇 |
2003年 | 2331篇 |
2002年 | 2306篇 |
2001年 | 1661篇 |
2000年 | 1900篇 |
1999年 | 1042篇 |
1998年 | 517篇 |
1997年 | 417篇 |
1996年 | 474篇 |
1995年 | 425篇 |
1994年 | 445篇 |
1993年 | 399篇 |
1992年 | 468篇 |
1991年 | 391篇 |
1990年 | 389篇 |
1989年 | 346篇 |
1988年 | 343篇 |
1987年 | 334篇 |
1986年 | 302篇 |
1985年 | 396篇 |
1984年 | 473篇 |
1983年 | 404篇 |
1982年 | 385篇 |
1981年 | 371篇 |
1980年 | 331篇 |
1979年 | 362篇 |
1978年 | 349篇 |
1977年 | 345篇 |
1976年 | 319篇 |
1975年 | 392篇 |
1974年 | 321篇 |
1973年 | 313篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
A Nicák 《Physiologia Bohemoslovaca》1986,35(2):118-126
The author describes changes in the disintegration of erythrocytes by brilliant cresyl blue in correlation to age, in rats aged 21, 42, 90-105, 340-360 and 690-720 days. The erythrocytes were incubated for 4 hours in an isotonic NaCl solution, in Krebs-Ringer solution and in each of these solutions plus brilliant cresyl blue. Disintegration in plain NaCl solution was found to be the greatest in the case of erythrocytes from 690- to 720-day-old rats. In the same solution plus brilliant cresyl blue, the rate of disintegration was very high in 21-day-old, 42-day-old and 690- to 720-day-old animals; at 90-105 days it was lower and at 340-360 days it was the lowest. Disintegration of erythrocytes in plain Krebs-Ringer solution was the lowest at 21 and 42 days; in the other age groups it was slightly higher. On adding brilliant cresyl blue, the rate of disintegration rose significantly in 21-, 42- and 690- to 720-day-old animals; at 90-105 days and 340-360 days it was no different from disintegration in plain Krebs-Ringer solution. It can be seen from the results that the rate of brilliant cresyl blue-induced erythrocyte disintegration is dependent on the age of the animals from which the erythrocytes are taken. 相似文献
3.
4.
5.
6.
In a section of the Liassic southwest of the village of Préjano (Prov. Logroño) Sinemurian Dasyclad algae were found for the first time in the “Bankkalk-Series” of the “Carniolas-Formation” which is not dated up to that time. Six species,Dissocladella lucasi (Cros & Lemoine),Dissocladella iberica nov. sp.,Dissocladella ebroensis nov. sp.,Sestrosphaera liasina Pia,Gyroporella retica (Zanin) andMacroporella nov. sp. aff. sturi Bystricky are described. 相似文献
7.
8.
9.
Georg Söderbom 《Ethnos》2013,78(1-2):95-100
Current debates over the concept of culture are examined, especially with regard to the relationship of culture to bounded collectivities, human nature, and individuality; present‐day views are seen against the background of back‐and‐forth swings in the history of anthropological thought. Recent theorizing about cultural acquisition is also considered. 相似文献
10.