全文获取类型
收费全文 | 171篇 |
免费 | 3篇 |
国内免费 | 14篇 |
专业分类
林业 | 3篇 |
农学 | 17篇 |
基础科学 | 1篇 |
7篇 | |
综合类 | 101篇 |
农作物 | 13篇 |
水产渔业 | 3篇 |
畜牧兽医 | 25篇 |
园艺 | 15篇 |
植物保护 | 3篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 8篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 5篇 |
2014年 | 4篇 |
2013年 | 6篇 |
2012年 | 10篇 |
2011年 | 14篇 |
2010年 | 12篇 |
2009年 | 8篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 7篇 |
2003年 | 1篇 |
2000年 | 5篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 28篇 |
1985年 | 24篇 |
1984年 | 5篇 |
排序方式: 共有188条查询结果,搜索用时 263 毫秒
1.
The effects of Neemgard, an acaricidal and fungicidal formulation obtained from neem (Azadirachta indica) seed kernels, on the phytophagous miteTetranychus cinnabarinus, the predacious mitePhytoseiulus persimilis, and the predatory spiderChiracanthium mildei, were investigated in laboratory experiments. Neemgard was highly toxic toT. cinnabarinus but had no toxic effect onC. mildei orP. persimilis. Another neem formulation—the insecticidal Neemix 45—caused conspicuous repellency, but no mortality, inT. cinnabarinus. 相似文献
2.
3.
如玉45 号是以BAL-22-31 为母本,以山苦瓜-45 为父本配制而成的中熟苦瓜一代杂种。生长势较强,第1 雌花节位第17 节左右,主侧蔓均可结瓜;商品瓜长6 cm 左右,横径3 cm 左右,单瓜质量40 g 左右,老熟瓜可达200 g;果实两头较尖,橄榄形,瓜皮深绿色,纵棱尖瘤,肉质脆嫩,苦味较重,回味甘甜,总皂甙含量较高,适合煲汤和深加工;田间鉴定对枯萎病和白粉病的抗性较强,一般产量4 200 kg·(667 m2)-1 左右,采收期可达6 个月,适宜福州以南龙岩、漳州、泉州、厦门等地栽培。 相似文献
4.
本文报告对我国5种假霜霉的研究结果,其中荨麻假霜霉(Pseudoperonosporaurticae)是在中国的首次记录。标本保存于四川雅安四川农业大学。 相似文献
5.
6.
ZHANG Na YANG Wen-xiang YAN Hong-fei LIU Da-qun CHU Dong MENG Qing-fang ZHANG Ting 《中国农业科学(英文版)》2006,5(12):938-943
Amplified fragment length polymorphism (AFLP) analysis was carried out in Thatcher, near isogenic lines (NILs) carrying different genes conferring resistance against wheat leaf rust, and TcLr45 x Thatcher F2 progenies were used to develop markers for Lr45 gene. Sixty AFLP primer combinations were screened and most of them provided clear amplification products, 31 primer combinations displayed polymorphism of TcLr45 in 23 NILs. Two AFLP markers closely linked to the gene Lr45 were acquired: P-AGG/M-GAG261 bp, which was found closely linked to the Lr45 locus at a distance of 0.6 cM on one side, and P-ACA/M-GGT105 bp, which was found at a distance of 1.3 cM on the other side. The specific bands were cloned and subsequently sequenced. The 261-bp fragment produced by P-AGG/M-GAG showed 86% similarity with the sequence of Vulgare Hart I gene; the 105-bp fragment produced by P-ACA/M-GGT showed 96% similarity with the phosphatidylserine decarboxylase gene of the Triticum monococcum. Both included an open reading frame (ORF). 相似文献
7.
Seventeen cutaneous and oral tumours with light microscopic features of plasmacytomas from 16 dogs were studied. Clinically, most neoplasms were benign, although three recurred after excision and three were locally invasive. Tumours most often arose on the pinnae, digits, gingiva, and inguinal regions near areas of chronic inflammation and exhibited variable degrees of plasmacytic differentiation microscopically. Diagnosis of plasmacytoma was confirmed in paraffin-embedded tissues with a panel of leukocyte differentiation antigen markers that included cross-reactive antibodies for Mb-1 (CD79a), CD3, and vimentin and canine-specific antibodies for CD45RA and CD18. Immunoreactivity for Mb-1 and CD45RA, including staining of multinucleate cells and cells with karyomegaly, confirmed a B-cell origin of neoplasms, while staining for CD3 and CD18 revealed an extensive network of infiltrative T-cells and dendritic cells in tumours suggestive of a directed immune response. These findings (i) demonstrate the value of using a panel of antibodies for leukocyte antigens to differentiate plasmacytomas from other cutaneous and oral round cell tumours, and (ii) suggest that immune recognition and responsiveness within tumours may play a role in the behaviour of plasmacytomas in dogs by affecting tumour cell growth and differentiation. 相似文献
8.
9.
本研究于1977年在雅安市本校农场,就五个光、温反应特性不同品种:DissiD52/37、矮脚南特、矮子占、71—56、IR_8作亲本,采用非限定半双列杂交获得10个杂种F_1,对其高温短日生育期、短日促进率(短日敏感性),高温促进率(感温性)进行了测定。结果(1)短的高温短日生育期在杂种F_1表现呈完全显性或超亲显性;(2)在适温条件下,短日促进率(短日敏感性)高的,在杂种F_1表现为完全显性或超亲显性。并观察到在适温以下低温条件,明显抑制了短日敏感性的表现;(3)在自然日照下,高温促进率低的特性,杂种F_1表现为完全显性,而在短日处理下结果恰相反,即高温促进率高的为完全显性或超亲显性。另外,讨论了水稻品种光、温特性之间的相互制约关系。 相似文献
10.
应用~(14)C示踪技术测定三个籽粒饱满度不同的小麦品种,结果表明:籽粒饱满度与品种的净光合率、光合持续期和同化物在籽粒中的分配率有关;光合作用后30分钟测定,~(14)C同化物的分配,叶片最高,叶鞘其次,麦穗再次,茎中最低;开花期~(14)C同化物在成熟麦穗中的分配,约占引入量的25—32%,灌浆期~(14)C同化物在成熟麦穗中的分配,对籽粒饱满的两个品种,占引入量的50%以上,而籽粒不饱满的品种,分配率还不到30%。 相似文献