全文获取类型
收费全文 | 2987篇 |
免费 | 263篇 |
国内免费 | 1篇 |
出版年
2017年 | 26篇 |
2016年 | 27篇 |
2015年 | 52篇 |
2014年 | 71篇 |
2013年 | 99篇 |
2012年 | 114篇 |
2011年 | 119篇 |
2010年 | 98篇 |
2009年 | 75篇 |
2008年 | 124篇 |
2007年 | 139篇 |
2006年 | 101篇 |
2005年 | 103篇 |
2004年 | 98篇 |
2003年 | 90篇 |
2002年 | 90篇 |
2001年 | 85篇 |
2000年 | 69篇 |
1999年 | 75篇 |
1998年 | 48篇 |
1997年 | 50篇 |
1996年 | 53篇 |
1995年 | 37篇 |
1994年 | 40篇 |
1993年 | 45篇 |
1992年 | 51篇 |
1991年 | 70篇 |
1990年 | 51篇 |
1989年 | 65篇 |
1988年 | 42篇 |
1987年 | 58篇 |
1986年 | 41篇 |
1985年 | 33篇 |
1984年 | 50篇 |
1983年 | 33篇 |
1982年 | 32篇 |
1980年 | 35篇 |
1979年 | 39篇 |
1978年 | 34篇 |
1977年 | 28篇 |
1976年 | 29篇 |
1975年 | 28篇 |
1974年 | 42篇 |
1972年 | 25篇 |
1965年 | 38篇 |
1963年 | 36篇 |
1961年 | 33篇 |
1960年 | 24篇 |
1959年 | 29篇 |
1958年 | 28篇 |
排序方式: 共有3251条查询结果,搜索用时 31 毫秒
61.
SYNOPSIS. Plasmodium balli sp. nov. is described from Anolis lionotus and A. poecilopus of central Panama.
Large, elongate gametocytes and segmenters containing up to 100 merozoites are produced by P. balli. Proerythrocytes and normoblasts are more commonly parasitized than erythrocytes. Pigment is uncommon, but when present consists of a minute dot. Hypertrophy, distortion and lysis of host cell nuclei may result from parasitization of immature blood cells by gametocytes, while enucleated host cells are common. 相似文献
Large, elongate gametocytes and segmenters containing up to 100 merozoites are produced by P. balli. Proerythrocytes and normoblasts are more commonly parasitized than erythrocytes. Pigment is uncommon, but when present consists of a minute dot. Hypertrophy, distortion and lysis of host cell nuclei may result from parasitization of immature blood cells by gametocytes, while enucleated host cells are common. 相似文献
62.
The Control of Color in Mammals 总被引:1,自引:0,他引:1
SYNOPSIS. Recent advances in the biology of mammalian pigmentationare reviewed.Particular attention is given to emerging informationon the integration of pigmentary events occurring at differentlevels of biological organization within mammalian skin andhair. The structural and functional significance of keratinocytesand melanocytes as components of mammalian epidermal melaninunits is viewed from this perspective. New evidence on the natureof genetic, developmental, endocrine, and radiation influenceson performance of melanocytes and the establishment of pigmentarypatterns is summarized. 相似文献
63.
64.
The fixing-staining mixture consisted of 1 part of 2% aqueous OsO4 and 3 parts of 3% Nal in distilled water. Fresh lungs were cut into 2 mm slices and immersed in this solution for 24 hr at room temperature. Controls were fixed in buffered OsO4 alone. Selective staining of type II alveolar cells was shown by the OsOt-NaI mixture but was absent in the controls. No additional staining of the sections was required, and the selectivity was readily observable in either paraffin or Araldite sections by light microscopy and in Araldite sections by electron microscopy 相似文献
65.
SYNOPSIS Plasmodium gonatodi sp. nov. is described from Gonatodes albogularis fuscus of eastern Panama. It is characterized by elongate gametocytes and polymorphic schizonts containing 12-46 nuclei when apparently mature. Both proerythrocytes and erythrocytes are commonly parasitized, host cells are hypertrophied and distorted, and their nuclei are displaced. Prematuration sexual stages may be irregularly shaped and larger than mature gametocytes.
Plasmodium diploglossi Aragão and Neiva , 1909 is reported from Mabuya mabouya in eastern Panama, and Plasmodium morulum sp. nov. is described from this host. P. morulum usually parasitizes immature erythrocytes, and is characterized by lenticular or oval to round gametocytes, and schizonts with 14-40 nuclei usually arranged in a globular mass. Host cells are slightly hypertrophied and distorted, and their nuclei are usually displaced. Inoculation of infected blood into clean hosts produces numerous schizonts in white cells as well as in the erythrocyte series.
Pigment in both P. gonatodi and P. morulum , if present, consists of a few minute dark dots which do not meet the polarized light test for hemozoin. 相似文献
Plasmodium diploglossi Aragão and Neiva , 1909 is reported from Mabuya mabouya in eastern Panama, and Plasmodium morulum sp. nov. is described from this host. P. morulum usually parasitizes immature erythrocytes, and is characterized by lenticular or oval to round gametocytes, and schizonts with 14-40 nuclei usually arranged in a globular mass. Host cells are slightly hypertrophied and distorted, and their nuclei are usually displaced. Inoculation of infected blood into clean hosts produces numerous schizonts in white cells as well as in the erythrocyte series.
Pigment in both P. gonatodi and P. morulum , if present, consists of a few minute dark dots which do not meet the polarized light test for hemozoin. 相似文献
66.
Partitioning of respiratory flow resistance in man 总被引:9,自引:0,他引:9
67.
68.
69.
70.