全文获取类型
| 收费全文 | 1347篇 |
| 免费 | 97篇 |
| 国内免费 | 1篇 |
专业分类
| 林业 | 44篇 |
| 农学 | 32篇 |
| 基础科学 | 9篇 |
| 149篇 | |
| 综合类 | 129篇 |
| 农作物 | 27篇 |
| 水产渔业 | 92篇 |
| 畜牧兽医 | 897篇 |
| 园艺 | 17篇 |
| 植物保护 | 49篇 |
出版年
| 2023年 | 16篇 |
| 2022年 | 8篇 |
| 2021年 | 34篇 |
| 2020年 | 31篇 |
| 2019年 | 36篇 |
| 2018年 | 36篇 |
| 2017年 | 26篇 |
| 2016年 | 41篇 |
| 2015年 | 33篇 |
| 2014年 | 35篇 |
| 2013年 | 72篇 |
| 2012年 | 42篇 |
| 2011年 | 65篇 |
| 2010年 | 42篇 |
| 2009年 | 43篇 |
| 2008年 | 53篇 |
| 2007年 | 56篇 |
| 2006年 | 52篇 |
| 2005年 | 57篇 |
| 2004年 | 53篇 |
| 2003年 | 47篇 |
| 2002年 | 41篇 |
| 2001年 | 29篇 |
| 2000年 | 28篇 |
| 1999年 | 13篇 |
| 1998年 | 26篇 |
| 1997年 | 27篇 |
| 1996年 | 17篇 |
| 1995年 | 19篇 |
| 1994年 | 9篇 |
| 1993年 | 22篇 |
| 1992年 | 24篇 |
| 1991年 | 30篇 |
| 1990年 | 30篇 |
| 1989年 | 23篇 |
| 1988年 | 27篇 |
| 1987年 | 17篇 |
| 1986年 | 15篇 |
| 1985年 | 15篇 |
| 1984年 | 9篇 |
| 1983年 | 11篇 |
| 1980年 | 8篇 |
| 1979年 | 12篇 |
| 1978年 | 16篇 |
| 1977年 | 9篇 |
| 1976年 | 8篇 |
| 1975年 | 8篇 |
| 1973年 | 14篇 |
| 1970年 | 9篇 |
| 1966年 | 7篇 |
排序方式： 共有1445条查询结果，搜索用时 15 毫秒
1.
2.
Haematological and biochemical investigations were performed on 14 koalas with uncomplicated cystitis, 8 with complicated cystitis, 8 with conjunctivitis, 8 with lymphosarcoma, and 14 with miscellaneous diseases. Changes were limited and inconsistent in individual koalas with uncomplicated cystitis and conjunctivitis. In contrast, individual koalas with complicated cystitis were more likely to have anaemia, leukocytosis due to neutrophilia, hypoproteinaemia due to hypoalbuminaemia, and azotaemia due to elevated urea concentration. Although these changes were non-specific they did allow assessment of prognosis for survival and response to treatment. Koalas with lymphosarcoma were invariably anaemic, leukaemic, azotaemic and hypoalbuminaemic. Elevated enzymes (aspartate transaminase [AST]. lactate dehydrogenase [LD] and gamma glutamyl transferase [GGT]) were more common in koalas with lymphosarcoma. Koalas affected by miscellaneous conditions showed variable changes but once again anaemia, leukocytosis, azotaemia, elevated AST and LD, and hypoalbuminaemia were not uncommon. On the basis of these findings a minimal profile is suggested for the investigation of sick koalas and would include haematocrit, total and differential leukocyte counts, urea, total protein and albumin concentrations and AST, GGT and LD activities. 相似文献
3.
4.
5.
6.
7.
8.
9.
10.
Itacir P. Ubert Cristiano M. Zimmer Kelly Pellizzaro Luiz C. Federizzi Itamar Cristiano Nava 《Euphytica》2017,213(2):41
Avena sativa L. subsp. nudisativa has the ability to produce naked grains. Genetic studies on the naked trait of oat began over a century ago, but the genetic and molecular factors associated with the expression of this trait have not been fully clarified. The objectives of this study were to evaluate the naked trait in two oat populations of recombinant inbred lines (RILs), to determine the number of genes, to estimate the heritability, and to map genomic regions associated with the naked trait in hexaploid oat. Parental lines and RILs of each population were screened for the naked trait from plants grown in the field over a 2 year period. Based on the phenotypic data, the oat RILs were classed as naked, partially naked, partially hulled and hulled. In both populations and years, a great number of RILs showed variable expressivity for the naked trait. The genetic analysis indicated the action of a major gene (N1) with the action of modifying genes controlling the formation of naked grains. The results of the estimate of heritability show that environmental conditions do not have a great influence in determining the naked trait. The quantitative trait loci analysis detected a genomic region with a large effect on the naked trait that explained more than 50% of the phenotypic variation. Further studies are needed to validate the use of these molecular markers to assist breeding programs to select high quality and stable naked oat cultivars. 相似文献