全文获取类型
收费全文 | 237篇 |
免费 | 28篇 |
国内免费 | 25篇 |
出版年
2023年 | 9篇 |
2022年 | 10篇 |
2021年 | 3篇 |
2020年 | 13篇 |
2019年 | 15篇 |
2018年 | 13篇 |
2017年 | 12篇 |
2016年 | 11篇 |
2015年 | 12篇 |
2014年 | 4篇 |
2013年 | 21篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 7篇 |
2007年 | 12篇 |
2006年 | 15篇 |
2005年 | 10篇 |
2004年 | 9篇 |
2003年 | 9篇 |
2002年 | 9篇 |
2001年 | 11篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 6篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1980年 | 3篇 |
1971年 | 1篇 |
排序方式: 共有290条查询结果,搜索用时 15 毫秒
1.
2.
几种药用植物精油的抗真菌活性研究 总被引:5,自引:0,他引:5
研究了作用浓度为0:7-4.0μL/mL的南方药用植物香茅(Cymbopogon citratus)、广藿香(Pogostemon cablin(Blanco)Benth)、大叶桉(Eucalyptus robusta Smith)和蛇床(Cnidium monnier(L.)Cusson)的精油对6种植物病原真菌的抑制活性。结果表明,大叶桉、广藿香和香茅精油对串珠镰刀病菌(Fussarium moniliforme)、玉米弯孢霉菌(Curvjlaria lunata)对多种供试植物病原真菌的生长有明显抑制活性,其中,香茅精油在浓度为3.3μL/mL时,能完全抑制大部分供试真菌的生长。但不同精油对于各病原真菌的抑制率有一定差异。本研究为复合植物精油抗真菌农药的开发提供依据。 相似文献
3.
4.
5.
Mostafa Hasanzadeh Mehrnoosh Mohammadifar Maryam Tavakol Norabadi Samaneh Dashtipoor Navazollah Sahebani Hassan Reza Etebarian 《Archives Of Phytopathology And Plant Protection》2013,46(17):2087-2094
Environmental pollution in addition to direct damage on plant growth, with the destruction of biological control agents, causes indirect damage to plants. The aim of this research was to study the effects of different concentrations (0, 500, 1000, 1500 and 2000 ppm) of heavy metals including Ag, Co, Cu, Fe, Hg, Mn, Pb and Zn on the mycelial growth and to assess the fungicidal or fungistatic effects of these salts on five Nematophagus fungi including Trichoderma harzianum (T8), Trichoderma virens (T21), Trichoderma hamatum (T9), Pochonia chlamydosporia var. chlamydosporia and Arthrobotrys oligospora. The results show that Ag, Co, Cu, Fe and Hg could stop the mycelium growth of all fungi, but Mn, Pb and Zn cannot inhibit the growth of these fungi completely. Among the first group, Hg and Cu stopped the growth of fungi even in 500 ppm. Among these metals that inhibit the growth of fungi, Cu has fungistatic effect and others have fungicide effect. The experiment was conducted in vitro condition, using potato dextrose agar (PDA) under complete randomised design with four replications. The data of mycelium growth were recorded at seven days after inoculation at 25 ± 2°C. 相似文献
6.
水分胁迫和杀真菌剂对黄顶菊生长和抗旱性的影响 总被引:1,自引:0,他引:1
利用盆栽试验研究水分胁迫下AM真菌对黄顶菊生长和抗旱性的影响,揭示黄顶菊入侵过程中的微生物学机制。以苯菌灵为杀真菌剂,在土壤相对含水量为120%、80%、40%和20%条件下,分别设灭菌和不灭菌两种处理。结果表明,水分胁迫显著降低了黄顶菊株高、干重和主根长,而对AM真菌侵染率无显著影响。施用苯菌灵显著降低了菌根侵染率、叶片保水力、保护酶活性、可溶性糖和可溶性蛋白含量,提高了MDA含量。不灭菌处理下黄顶菊植株对土壤有效N和有效P的利用率较高,且植株全N、P含量显著高于灭菌处理,菌根贡献率随土壤相对含水量降低而逐渐提高,重度胁迫分别是渍水条件下的1.84和1.88倍。土壤水分状况和AM真菌的交互作用对黄顶菊生物量和生理指标影响显著。AM真菌共生能够促进黄顶菊根系对土壤水分和矿质营养吸收,改善植物代谢活动,提高抗旱性。实验结果为黄顶菊合理防控措施的制定提供了依据,同时作为丛枝菌根的基础性研究也具有重要的意义。 相似文献
7.
Hiroshi Fukui Ryoichi Nemori Koichi Koshimizu Yoshimitsu Yamazaki 《Bioscience, biotechnology, and biochemistry》2013,77(1):181-187
The structures of three new gibberellins A30, A48 and A49 and a new kaurenolide, isolated from seeds of Cucurbita pepo L., were elucidated. The structures of GA39, GA48 and GA49 were shown to be ent-3α,12β-dihydroxygibberell-16-ene-7,19,20-trioic acid (1), ent-2α,3α,10,12α-tetrahydroxy-20-norgibberell-16-ene-7,19-dioic acid 19,10-lactone (5) and the epimer at C–12 of GA48 (8), respectively. The kaurenolide was shown to have the structure: ent-6β,7α,12β-trihydroxykaur-16-en-19-oic acid 19,6-lactone (14). 相似文献
8.
Application of Biofilm-Forming Bacteria on the Enhancement of Organophosphorus Fungicide Degradation
This study aimed to develop technology enhancing the biodegradation efficacy against organophosphorus fungicide with biofilm-forming bacteria in situ. Using the crystal violet staining method, two bacterial strains having biofilm formation capability were isolated and identified as Pseudomonas sp. C7 and Bacillus sp. E5. Compared with the culture of tolclofos-methyl degrader Sphingomonas sp. 224, biofilm formation was improved by co-inoculation with biofilm-forming bacterium Bacillus sp. E5. Evaluated in liquid culture conditions, this two-species mixed consortium was observed to degrade tolclofos-methyl more effectively than Sphingomonas sp. 224 alone, with an approximately 90% degradation efficiency within 48 h of dosing. The improved effectiveness of the consortium biofilm was reflected using soil in situ with an approximately 7% increased degradation ratio over Sphingomonas sp. 224 alone. This is the first report demonstrating improved bioremediation degradation efficacy against tolclofos-methyl exhibited by a consortium biofilm. This work presents a possible effective bioremediation strategy using a specific biofilm composition against pollutants containing organophosphorus compounds in situ. 相似文献
9.
Natarajan Suganthy Shanmugiahthevar Karutha Pandian 《Journal of enzyme inhibition and medicinal chemistry》2013,28(3):702-707
Alzheimer's disease is a progressive neurodegenerative illness accounting for approximately 50% of all types of dementia in elderly people. The only symptomatic treatment proven effective to date is the use of cholinesterase inhibitors to augment surviving cholinergic activity. The purpose of this study is to investigate cholinesterase inhibitory activity of mangroves as an alternative medicine for the treatment of Alzheimer's disease. About nine mangrove plants, which were used as folk medicine in tropical countries, were collected from Parangipettai, Vellar estuary, Tamilnadu, India. Nile Tilapia muscle homogenate was used as source of enzyme. Inhibitory effect of methanolic leaf extract was assessed under in vitro condition by incubating various concentration of the extract with total cholinesterase and butyryl cholinesterase and assessing their residual activities by Ellman's colorimetric method. The results showed that of the nine plants screened Rhizophora lamarckii, Suaeda monica, Avicennia officinalis and Sesuvium portulacastrum showed 50% inhibitory activity to both TChE and BChE at concentrations less than 2 mg/mL when compared to other plant extracts, which was comparable to the standard drug Donepezil. Phytochemical analysis showed the presence of alkaloids in high concentration which might be correlated to its cholinesterase inhibitory activity. 相似文献
10.
Andrea E. Glassmire Casey Philbin Lora A. Richards Christopher S. Jeffrey Joshua S. Snook Lee A. Dyer 《Ecology letters》2019,22(2):332-341
Phytochemical traits are a key component of plant defense theory. Chemical ecology has been biased towards studying effects of individual metabolites even though effective plant defenses are comprised of diverse mixtures of metabolites. We tested the phytochemical landscape hypothesis, positing that trophic interactions are contingent upon their spatial location across a phytochemically diverse landscape. Specifically, intraspecific phytochemical changes associated with vertical strata in forests were hypothesised to affect herbivore communities of the neotropical shrub Piper kelleyi Tepe (Piperaceae). Using a field experiment, we found that phytochemical diversity increased with canopy height, and higher levels of phytochemical diversity located near the canopy were characterised by tradeoffs between photoactive and non‐photoactive biosynthetic pathways. For understory plants closer to the ground, phytochemical diversity increased as direct light transmittance decreased, and these plants were characterised by up to 37% reductions in herbivory. Our results suggest that intraspecific phytochemical diversity structures herbivore communities across the landscape, affecting total herbivory. 相似文献