全文获取类型
收费全文 | 47421篇 |
免费 | 1920篇 |
国内免费 | 2826篇 |
专业分类
林业 | 5131篇 |
农学 | 4346篇 |
基础科学 | 511篇 |
2706篇 | |
综合类 | 18487篇 |
农作物 | 3356篇 |
水产渔业 | 1753篇 |
畜牧兽医 | 7591篇 |
园艺 | 4246篇 |
植物保护 | 4040篇 |
出版年
2024年 | 142篇 |
2023年 | 463篇 |
2022年 | 843篇 |
2021年 | 1018篇 |
2020年 | 1099篇 |
2019年 | 1276篇 |
2018年 | 923篇 |
2017年 | 1288篇 |
2016年 | 1876篇 |
2015年 | 1639篇 |
2014年 | 2157篇 |
2013年 | 2383篇 |
2012年 | 3190篇 |
2011年 | 3253篇 |
2010年 | 2630篇 |
2009年 | 2639篇 |
2008年 | 2624篇 |
2007年 | 2978篇 |
2006年 | 2350篇 |
2005年 | 2136篇 |
2004年 | 1580篇 |
2003年 | 1375篇 |
2002年 | 1225篇 |
2001年 | 1307篇 |
2000年 | 1104篇 |
1999年 | 1020篇 |
1998年 | 782篇 |
1997年 | 689篇 |
1996年 | 741篇 |
1995年 | 806篇 |
1994年 | 806篇 |
1993年 | 532篇 |
1992年 | 514篇 |
1991年 | 442篇 |
1990年 | 471篇 |
1989年 | 413篇 |
1988年 | 436篇 |
1987年 | 286篇 |
1986年 | 146篇 |
1985年 | 118篇 |
1984年 | 99篇 |
1983年 | 68篇 |
1982年 | 45篇 |
1981年 | 46篇 |
1980年 | 39篇 |
1979年 | 28篇 |
1978年 | 34篇 |
1977年 | 46篇 |
1956年 | 12篇 |
1955年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Transgenic crops having alien genes from different sources are getting popularity. A Rice (Oryza sativa L.) containing gene from Bacillus thuringiensis, a soil bacterium, was assessed to study the potential risks of transgenic plants on environment. The crop was found resistant to target insect pests. Rice variety Basmati-370 transformed with two insecticidal genes, crylAc and cry2A, was grown under field conditions for several years. Data were collected at different stages of the plant growth. Fate of Cry protein in soil, effect of Bt protein on non-target insects, risks of vertical and horizontal gene flow were evaluated. No potential hazard was found at all levels. Bt protein was unstable and degraded significantly in soil within 30 days after harvesting the crop. No harmful effects were found on non-target insects (insects other than order lepidoptera). Maximum gene flow of 0.02% was observed at close spacing and no evidence of horizontal gene transfer to Rhizobium spp. was found. In conclusion, the transgenic rice plants transformed with Bt genes have no harmful effects on the environment. 相似文献
992.
The aims of this study were to investigate the effect of gradual water deficit stress on some phonological and morphological traits and grain yield of desi and kabuli chickpea cultivars. This study was carried out in 2007 and 2008, to evaluate responses of three chickpea cultivars (Hashem and Arman from kabuli and Pirooz from desi type) under well watering (I1: 70mm evaporation from class A pan), gradual water deficit (12 and 13: 70→90→ 110→130 and 70→100→130mm evaporation from class A pan, respectively) and severe water stress (14: 130mm evaporation from class A pan). Result showed that days to flowering and plant height were decreased, as water limitation increased. This reduction was significant under gradual water stress (I2 and I3) and Severe water deficit (I4), compared with control (I1). There were no significant differences in grain filling period and grain yield among I~, I2 and I3 irrigation treatments. No significant differences in days to physiologic maturity and number of sub branches were recorded among irrigation treatments. Interactions of year×cultivar for days to physiologic maturity, grain filling period and grain yield (P≤0.01) and for days to flowering and plant height (P≤0.05) were significant. The superiority of Arman in producing comparatively greater grain yield could be attributed to higher grain filling period of this cultivar in both years. 相似文献
993.
994.
[目的]筛选出长白柳嫩茎离体培养各阶段的培养基。[方法]以长白柳嫩茎基部直接再生形成的丛生芽团为试材,利用"延缓生长"的方法在试管内对长白柳进行种质保存,应用均匀设计法探讨了影响长白柳丛生芽团试管保存的主要因子和水平,筛选最适于长白柳丛生芽团试管保存的培养基。[结果]长白柳最适宜的丛生芽团试管保存培养基为:N-68+根皮苷3.20 mg/L+KT0.70 mg/L,保存43个月生长率仅为0.97%。对保存前后的芽苗生根情况对比结果表明,保存后的芽苗生根速度快,生根率达99.6%以上,较未保存前的生根率99.0%高。[结论]在试管内采取"延缓生长"法保存长白柳丛生芽团是切实可行的新方法。 相似文献
995.
研究旨在克隆苏云金芽胞杆菌(Bacillus thuringiensis,Bt)Q-12的cry1Ac28基因并在原核载体中表达。应用PCR-RFLP法鉴定出Bt Q-12中含有cry1Ac基因,根据已知的cry1Ac全长基因序列设计特异引物,以Bt Q-12基因组DNA为模板扩增cry1Ac全长基因,与大肠杆菌(Escherichia coli)表达载体pEB相连接获得含有cry1Ac全长基因的重组质粒pEB-cry1Ac,经过序列分析表明,该基因编码区为3 537 bp,编码1 178个氨基酸,分子质量为133.3176 ku,pI为4.885,为弱酸性蛋白质,亮氨酸(Leu)、丝氨酸(Ser)、谷氨酸(Glu)三种氨基酸含量最高,分别为8.06%、7.80%、7.72%,该基因在大肠杆菌BL21(DE3)菌株能够正常表达133.3176 ku蛋白。该基因核苷酸序列已在GenBank中登录,登录号为FJ610439,并由Btδ-内毒素基因国际命名委员会正式命名为cry1Ac28。为进一步研究cry1Ac28蛋白功能和活性打下了良好的基础。 相似文献
996.
997.
998.
[目的]以毕赤酵母(Pichia pastoris)X33为宿主菌高效表达黑曲霉(Aspergillus niger)糖化酶,为进一步扩大糖化酶在工业上的应用奠定基础。[方法]利用RT-PCR技术,提取黑曲霉总RNA进行反转录,以得到的cDNA为模板,根据NCBI数据库中A.nigerCBS513.88糖化酶的cDNA序列(glaA)设计引物,通过PCR扩增得到去除天然信号肽的糖化酶成熟肽编码基因glaAm,并将其克隆到pUC19载体中,序列分析表明,glaAm的开放阅读框由1 879个核苷酸组成,编码625个氨基酸。以此片段构建了pFLDα-glaAm重组表达载体,经NsiI线性化后,电击转化毕赤酵母X-33。摇瓶培养中通过添加终浓度为0.5%的甲醇诱导糖化酶的分泌。[结果]SDS-PAGE和Starch-PAGE显示,糖化酶得到正确的分泌表达,且具有较高的生物活性,发酵上清液中酶活最高达到380.78 U/ml(发酵液)。重组糖化酶的最适反应温度和最适pH分别为6065℃和4.0,在pH2.55.5范围内均保持90%以上的酶活力。该酶具有较高的热稳定性,pH4.0条件下,该酶在50℃下稳定;60℃处理60 min,仍能保持90%以上的酶活力;65℃下的半衰期约为44 min。[结论]黑曲霉糖化酶基因在毕赤酵母X33中得到了异源高效表达。 相似文献
999.
1000.
ZHU Wenhua XIE Meng LIN Yuheng YANG Mingyu MA Qiumin TIAN Huiqin QU Guiqin 《东北农业大学学报(英文版)》2011,18(2)
The plasmid pGSA1285 was first modified by substituting its GUS sequence with the Chalcone synthase intron fragment from vector pFGC5941 to get the plant silencing expression vector that contained Kanamycin resistance site and was named as pGSA2285. Using PCR-based amplification, two different restriction sites at both ends of tobacco Bax inhibitor-1 (NtBI-1) gene were created, respectively, which made the construction of ihpRNA gene silencing vector more efficiently. Then, NtBI-1 genes were inserted into Multiple Cloning Site (MCS) of pGSA2285 respectively to form Bax inhibitor-1 ihpRNA gene silencing vector, named as pGSA4285, containing sense and anti-sense BI-1 sequence which was spliced by chalcone synthase intron. Combined PCR identification and enzyme restriction analyses, the results showed that Bax inhibitor-1 ihpRNA gene silencing vector had been constructed and transferred into Agrobacterium tumefaciens EHA105 successfully, which laid a foundation for the further study on the function of BI-1 in plant PCD regulation. 相似文献