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1.
INTRODUCTION Soil-borne pathogens, including Pythium spp. and Fusarium spp., cause significant yield losses in horticulture and agriculture crops (Mao et al., 1997). Current practices for controlling plant diseases are based largely on disease resistant crops, cultivation management in fields and application of synthetic pesticides (Elizabeth and Emmert, 1999). Biological control using antagonistic microbes to reduce the use of chemical pesticides in a system of integrated plantdisease … 相似文献
2.
Goswami BK Pandey RK Rathour KS Bhattacharya C Singh L 《Journal of Zhejiang University. Science. B》2006,7(11):873-875
INTRODUCTION Tomato (Lycopersicon esculentum, Mill.), an important vegetable crop is heavily attacked by root knot nematode, Meloidogyne spp. For the manage-ment of root knot nematodes although chemical nematicides were used till 1982, due to their high cost, toxic effect on beneficial soil borne microorganism and carcinogenic effect on human beings alternative approaches are practiced mainly through eco-friendly means like biological control agents, organic amendments, etc. (Singh and … 相似文献
3.
Insulin is one of the most extensively studied protein hormones, and its structure and function have been elucidated in many vertebrate species, ranging from human to fish. Insulin-like peptides (ILPs) also have been found and characterized in different invertebrates, including nematodes, mollusks and insects. However, insect ILPs turned out to be a structurally diverse group encoded by large multi-gene families that are expressed in the brain and other tissues and serve functions different from vertebrate insulin. Recent physiological and genetic studies have revealed that, in different insect species, the conserved insulin signaling pathway plays a key role in the regulation of a variety of fundamental processes, such as metabolism, growth, reproduction and aging. Here, the structures, distributions, conserved signaling pathways, and physiological functions of insect ILPs are reviewed in detail. 相似文献
4.
The quasitriangular structures of biproduct Hopf algebras 总被引：1，自引：0，他引：1
ZHAO Li-hui ZHAO Wen-zheng 《浙江大学学报(A卷英文版)》2007,8(1):149-157
PRELIMINARIES The smash product and the smash coproduct are well known in the context of Hopf algebra (Molnar, 1979; Montgomery, 1993) and remain an active area of study (Zhao et al., 2000; Delvaux, 2004; Zhao and Wang, 2005). Let H be a Hopf algebra over a field k and suppose B is a left H-module algebra and is also a left H-comodule coalgebra. Radford (1985) found necessary and sufficient conditions for the smash product and the smash coproduct on B?H to make it a Hopf algebra, w… 相似文献
5.
Adsorption of ruthenium ions on activated charcoal： influence of temperature on the kinetics of the adsorption process 总被引：1，自引：0，他引：1
Qadeer R 《Journal of Zhejiang University. Science. B》2005,6(5):353-356
INTRODUCTION Time dependence study of metal ions adsorptionon solids provides valuable information on the ad-sorption process and its mechanism. Rate of metalions adsorption process is dependent on a number offactors such as agitation of the solution, the state ofmetal ions in solution, concentration of metal ions andtemperature (Benes and Majer, 1980). Temperature isthe parameter generally ignored in most adsorptionstudies (Bangash and Hanif, 1992; Afzal et al., 1993;Atun and Kil… 相似文献
6.
Darban DA Gowen SR Pembroke B Mahar AN 《Journal of Zhejiang University. Science. B》2005,6(3):155-157
INTRODUCTION Pasteuria penetrans is an obligate, en-dospore-forming bacterial parasite of Meloidogynespp. and has shown potential as a biological controlagent against root-knot nematodes (Chen et al., 1996;Dickson et al., 1994) in pot experiments (Channer andGowen, 1988) and micro-plot experiments (Daudi etal., 1990; Trivino and Gowen, 1996). There are prac-tical and technical problems associated with massproduction of P. penetrans inoculum. In-vivo systems,although proven (Stirling an… 相似文献
7.
INTRODUCTION Fenton process has been well studied recently for its prospective applications in unmanageable wastewater treatment (Legrini et al., 1993; Ollis and Al-Ekabi, 1993; Prousek, 1996). The high effi-ciency of this process is traditionally thought to be due to the generation of hydroxyl radical (HO?, which is of a high oxidation potential (E0 = 2.80 V) and can mineralize the organic compounds com-pletely to water and carbon dioxide. In acidic me-dium, this radical mechanism ca… 相似文献
8.
As one of the greatest Afro-American writers of the 20th century during the period of the Harlem Renaissance, Zora Neale Hurston drew on her own experiences as a feminist Afro-American female to create a story of a female character Janie Crawford in her book There Eyes were Watching God. In the history of literature, it has come to be regarded as a"seminal work in both African-American literature and Woman’s literature."(Louis Gates 1993). The main character Janie Crawford is definitely a typical representative of feminism and feminist movement and as a women who successfully achieved her self-consciousness, she has been commenting and criticizing for a long period of time. This research paper will analyzes how Janie achieves her self-awakening in the man-dominated society through Janie’s childhood and her three periods of completely different marriages. 相似文献
9.
INTRODUCTION Computing shortest paths in directed graphs isa fundamental optimization problem with applica-tions to many areas of computer sciences and op-eration research (Bellman, 1958; Coremen, 1990;Cohen, 1993). Given a digraph G with non-negativeweights on its edges and two vertices s and t of G,the single-pair shortest path problem consists ofdetermining a directed path from s to t with mini-mum total weight. Among the well-known sequential algorithmsfor this problem is the classic… 相似文献
10.
INTRODUCTION With the development of modern industry,mass produced sheet-metal parts have been widelyapplied in mechanical, communication, electronics,and light industries in recent decades. Statisticsshowed that in the US, some 100 000 metal stamp-ings could be found in the average American homein the 1980s (Cheok and Nee, 1998). In Singapore,the manufacturing sector contributes more than25% to the GDP or a Total Gross Value of morethan US$24 billion (Tan, 1993). In China, th… 相似文献
11.
MAHAR Ali Nawaz MUNIR Muhammad ELAWAD Sami GOWEN Simon Richard HAGUE Nigel Graham Meckenzi 《浙江大学学报(A卷英文版)》2004,5(10)
Cells and cell-free solutions of the culture filtrate of the bacterial symbiont, Xenorhabdus nematophila taken from the entomopathogenic nematode Steinernema carpocapsae in aqueous broth suspensions were lethal to larvae of the diamondback moth Plutella xylostella. Their application on leaves of Chinese cabbage indicated that the cells can penetrate into the insects in the absence of the nematode vector. Cell-free solutions containing metabolites were also proved as effective as bacterial cells suspension. The application of aqueous suspensions of cells of X. nematophila or solutions containing its toxic metabolites to the leaves represents a possible new strategy for controlling insect pests on foliage. 相似文献
12.
MAHAR Ali Nawaz MUNIR Muhammad ELAWAD Sami GOWEN Simon Richard HAGUE Nigel Graham Meckenzi 《Journal of Zhejiang University. Science. B》2004,(10)
Cells and cell-free solutions of the culture filtrate of the bacterial symbiont, Xenorhabdus nematophila taken from the entomopathogenic nematode Steinernema carpocapsae in aqueous broth suspensions were lethal to larvae of the diamondback moth Plutella xylostella. Their application on leaves of Chinese cabbage indicated that the cells can penetrate into the insects in the absence of the nematode vector. Cell-free solutions containing metabolites were also proved as effective as bacterial cells suspension. The application of aqueous suspensions of cells of X. nematophila or solutions containing its toxic metabolites to the leaves represents a possible new strategy for controlling insect pests on foliage. 相似文献
13.
Mahar Ali Nawaz Munir Muhammad Elawad Sami Gowen Simon Richard Hague Nigel Graham Meckenzi 《浙江大学学报(A卷英文版)》2004,5(10):1183-1190
Cells and cell-free solutions of the culture filtrate of the bacterial symbiont, Xenorhabdus nematophila taken from the entomopathogenic nematode Steinernema carpocapsae in aqueous broth suspensions were lethal to larvae of the diamondback moth Plutella xylostella. Their application on leaves of Chinese cabbage indicated that the cells can penetrate into the insects in the absence of
the nematode vector. Cell-free solutions containing metabolites were also proved as effective as bacterial cells suspension.
The application of aqueous suspensions of cells of X. nematophila or solutions containing its toxic metabolites to the leaves represents a possible new strategy for controlling insect pests
on foliage. 相似文献
14.
Oil contaminated soil was collected from Huangpu River-Yangtze River estuary wetland, with the aim of isolating oil-degrading microorganisms and evaluating their ability to degrade diesel. Three bacterial strains were discovered and identified by sequencing their 16S rDNA genes, two were Pseudomonas and one was Alcaligcnes. The proper growth conditions of each bacterium were measured and presented for diesel biodegradation. Biodegradation assays revealed that the degradation rates of three bacterial strains were 42.5%, 14.6% and 15.9% in 7 d respectively. They all play an important role on the nalkanes within the range of C16-C25 components of diesel. The results indicated that the oil-degraders can adapt to degrade diesel. The bacterial strains can be used in wetland diesel pollution control. 相似文献
15.
鹅膏菌毒是一类真菌的总称 ,误食野生蘑菇的中毒事件中 ,95%以上由鹅膏菌引起 .国外自六十年代起 ,对其毒素毒理进行了深入的研究 ,而国内则只是在九十年代才开始这方面的工作 .为促进国内鹅膏菌毒素毒理的研究 ,作者概括了国内外各方资料 ,写就本文 .本文概述了鹅膏菌多肽毒素的种类、鹅膏菌毒素中毒反应及病理学症状、机体对鹅膏菌毒素的吸收、鹅膏菌毒素的毒性及毒理以及鹅膏菌毒素在生命科学研究中的应用 ,为国内这方面的研究提供了参考 . 相似文献
16.
从太湖中成功筛选出一株能够同时降解微囊藻毒素-RR(MC-RR)和微囊藻毒素-LR(MC-LR)的土著细菌MC-LTH11.经鉴定,该菌属寡养单胞菌属,并含有mlrA基因.在含有藻毒素粗提物的培养基中,MCLTH11能够在6 d内将初浓度分别为37.13 mg/L的MC-RR和18.49 mg/L的MC-LR完全降解,并且降解速度受到pH值、温度、初始微囊藻毒素浓度和培养基种类的影响.此外,MC-LTH11能够在1 d内完全降解太湖水样中的微囊藻毒素.研究结果表明,寡养单胞菌MC-LTH11具备对微囊藻毒素污染水体的修复能力,并可能是太湖水华爆发后微囊藻毒素降解的重要因素. 相似文献
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18.
Xing CH Zhu MH Cai MZ Liu P Xu GD Wu SH 《Journal of Zhejiang University. Science. B》2008,9(3):261-264
To investigate the Fe2 effects on root tips in rice plant, experiments were carded out using border cells in vitro. The border cells were pre-planted in aeroponic culture and detached from root tips. Most border cells have a long elliptical shape. The number and the viability of border cells in situ reached the maxima of 1600 and 97.5%, respectively, at 20～25 mm root length. This mortality was more pronounced at the first 1～12 h exposure to 250 mg/L Fe2 than at the last 12～36 h. After 36 h, the cell viability exposed to 250 mg/L Fe2 decreased to nought, whereas it was 46.5% at 0 mg/L Fe2 . Increased Fe2 dosage stimulated the death of detached border cells from rice cultivars. After 4 h Fe2 treatment, the cell viabilities were≥80% at 0 and 50 mg/L Fe2 treatment and were <62% at 150, 250 and 350 mg/L Fe2 treatment; The viability of border cells decreased by 10% when the Fe2 concentration increased by 100 mg/L. After 24 h Fe2 treatment, the viabilities of border cells at all the Fe2 levels were <65%; The viability of border cells decreased by 20% when the Fe2 concentration increased by 100 mg/L. The decreased viabilities of border cells indicated that Fe2 dosage and treatment time would cause deadly effect on the border cells. The increased cell death could protect the root tips from toxic harm. Therefore, it may protect root from the damage caused by harmful iron toxicity. 相似文献
19.
大叶黄杨白粉病近年来在河南省南阳市发生严重.对大叶黄杨植株春梢进行叶面喷施生防菌枯草芽孢杆菌Bv10菌株的发酵液,进行白粉病小区生防试验,结果显示:喷施7 d后,枯草芽孢杆菌Bv10发酵液对大叶黄杨白粉病的防治效果达70.37%,低于对照药剂粉锈宁;喷施14 d后,该生防菌的防效降低至25.26%. 相似文献
20.
Xiao-hong Pan Ying-xue Chen Mei-xiang Xiang Geng Xu Jian-an Wang 《Journal of Zhejiang University. Science. B》2010,11(10):754-761
A meta-analysis was performed to address the efficacy and safety of paclitaxel-eluting stent (PES) in ST-segment elevation
myocardial infarction (STEMI) patients. A systematic literature search was conducted to identify all randomized clinical trials
in mortality, recurrent myocardial infarction (rMI), repeat revascularization (RR), and stent thrombosis (ST). A total of
4190 STEMI patients were enrolled in six randomized trials comparing PES with bare-metal stent (BMS). The pooled repeat revascularization
rate was 5.7% in PES group, significantly lower than 10.0% in BMS group with an odds ratio (OR) of 0.56, 95% confidence interval
(CI) [0.44, 0.72] (P<0.00001). No significant difference was found between PES and BMS groups in mortality at one year after the indexing procedure
(3.9% vs. 5.1%, OR 0.88, 95% CI [0.63, 1.21], P=0.42). Similarly, rMI rate did not differ significantly between the two groups (3.4% vs. 4.1%, OR 0.80, 95% CI [0.56, 1.13],
P=0.21). PES was also associated with the comparable pooled rate of definite stent thrombosis with BMS (2.3% vs. 2.4%, OR 0.81,
95% CI [0.52, 1.26], P=0.35). The results show that PES improved clinical outcomes in STEMI patients with a decreased need for repeat revascularization
and no concerns for safety. 相似文献