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排序方式: 共有137条查询结果,搜索用时 171 毫秒
1.
Filip Franeta Sanja Mikić Željko Milovac Bojan Mitrović Dušanka Inđić Slavica Vuković 《国际虫害防治杂志》2019,65(1):23-32
Maize is arguably the most widely grown crop in the world, but it is often associated with one of its major insect pests, the European corn borer (ECB). The damage caused by this species to maize production is generally variable, but in many cases it is economically significant. This review paper provides an overview of the research findings on the natural plant defence mechanisms against ECB larvae published till now. What is resistance and how it is achieved, what is the chemical response of maize plants to insect feeding and how tolerance can be increased. A short introduction in breeding for resistance and a discussion if the mentioned traits can be used in conventional breeding in order to create maize hybrids less affected by ECB are given. 相似文献
2.
Lien VANDE MAELE Marc HEYNDRICKX Dominiek MAES Nele DE PAUW Maxime MAHU Marc VERLINDEN Freddy HAESEBROUCK An MARTEL Frank PASMANS Filip BOYEN 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2016,78(2):325-328
The antibacterial potential of organic acids and essential oil components against Brachyspira
hyodysenteriae, the causative pathogen of swine dysentery, was evaluated. Minimum inhibitory
concentrations (MIC) of 15 compounds were determined at pH 7.2 and pH 6.0, using a broth microdilution assay.
In addition, possible synergism was determined. MIC values for the three tested strains were similar. For
organic acids, MIC values at pH 6.0 were lower than at pH 7.2. B. hyodysenteriae was most
sensitive to cinnamaldehyde and lauric acid, with MIC values <1.5 mM. Most antibacterial effects of binary
combinations were additive, however, for thymol and carvacrol, synergism could be observed. In
vitro results demonstrate the antibacterial action of certain essential oil components and organic
acids against B. hyodysenteriae. 相似文献
3.
In well-aerated culture solutions Ca-montmorillonite at 0.25% concentration markedly accelerated and increased growth, glucose consumption and CO2 evolution by various Streptomyces, Micromonospora and Nocardia species. The montmorillonite was a little more active than Ca-humate and was usually still but somewhat less effective when confined to dialysis tubing. Ca-exchange resin, Na2SiO3 and finely powdered CaCO3 exerted very little or no effect. In many cultures the relation of glucose consumption to biomass formation indicated a more efficient use of the glucose C for cell synthesis in the presence of clay. In other cultures the greater biomass formation was associated with a more rapid and complete utilization of the glucose present. 相似文献
4.
John A. Hargreaves Laura D. Sheely Filip S. To 《Journal of the World Aquaculture Society》2000,31(3):390-402
Abstract.— The toxicity of substances that vary in toxicity through time (daily) as a function of pH are not effectively assessed with static renewal test methods. A control system to simulate diel pH fluctuation in eutrophic aquaculture ponds was established in a flow-through, wet-laboratory setting. Water (100 L/ min) was conditioned in a packed column of 3.81-cm Pall rings prior to distribution to 48 189-L fish tanks. Control system components included a distributed data acquisition and control system, a personal computer, and various pH control devices. pH values greater than that of influent water (pH 8.0) were achieved by additions of concentrated sodium hydroxide solutions; pH values less than that of influent water were achieved by additions of carbon dioxide gas. Two data acquisition and control software strategies were developed to control pH: one from pH 7.4 to 8.0 and the other from pH 8.0 to 9.6. The basic control strategy involved comparison of a projected pH value to a set point. A moving linear regression was used to forecast the pH value that would result following base or gas addition, and the rate of chemical addition was adjusted accordingly. The system has resulted in acceptable pH control (deviation < 0.1 pH unit), indicating the potential utility of a relatively simple control system for evaluation of fish physiological response to the characteristically dynamic environment of eutrophic aquaculture ponds. 相似文献
5.
Seven types of fungal melanins were compared with humic compounds from chernozem and podzol soils and with commercial humic acid. The results indicate some similarities but also distinct differences between the melanins and humic substances in spectral characteristics in the UV and visible regions and in their resistance to thermal degradation. 相似文献
6.
Franklin Prez Filip A.M. Volckaert Jorge Caldern 《Aquaculture (Amsterdam, Netherlands)》2005,250(3-4):586-591
White Spot Syndrome Virus (WSSV) has decimated the shrimp aquaculture around the world. Breeding efforts to generate resistant stocks are necessary but there is a lack of basic information on challenge test strategies focused on genetic selection. Infection routes and developmental stages were evaluated on Penaeus vannamei as a first step in a strategy to select white spot virus (WSSV)-resistant stocks. Mortalities could not be induced before the PL30 stage. The impact of infection by immersion and blended tissue was intermediate on mortalities when compared to the minced tissue treatment on PL30. Blended and minced tissue treatments produced the highest mortalities on PL40 while immersion was intermediate. A general tendency towards higher susceptibility associated with older stages was detected. Additionally, juveniles of 1 g average weight from three local breeding programs were challenged. There were no differences in survival between the programs, although two of them derived their progenies from survivors of strong WSSV events. The implications of these results to the WSSV epidemiological characteristics and breeding programs are discussed. 相似文献
7.
Doolaege EH Raes K De Vos F Verhé R De Smet S 《Plant foods for human nutrition (Dordrecht, Netherlands)》2011,66(2):196-202
The absorption, distribution and elimination of carnosic acid, the main antioxidant found in rosemary was studied, in vivo, in rats. Therefore, carnosic acid was administrated in a single dose, intravenously (20.5 ± 4.2 mg/kg) and orally (64.3 ± 5.8 mg/kg),
to four and nine rats, respectively. Blood samples were collected at different time points, and plasma concentrations of carnosic
acid were determined using LC-MS. Furthermore, total collection of urine and feces was done during 4 h and 24 h for the intravenous
and oral administrations, respectively. After euthanizing the rats, intestinal content, liver and muscle tissue were sampled
to determine carnosic acid concentrations. The bioavailability of carnosic acid, after 360 min, was 40.1%. Traces of carnosic
acid were found in the rats intestinal content, liver and muscle tissue of abdomen and legs. The recovery of carnosic acid
in the feces, 24 h after oral administration, was 15.6 ± 8.2%. Carnosic acid is absorbed into the bloodstream after oral administration
in rats and is therefore bioavailable. It was found that carnosic acid in vivo is present in its free form and that its main elimination route is the fecal route. 相似文献
8.
Tao Yang Xiaoman Xiong Rajesh Mishra Jan Novák Jiří Chaloupek Filip Sanetrnik Jiří Militký 《Fibers and Polymers》2016,17(12):2078-2084
This work deals with the study of acoustic performance of struto nonwovens and their relation to fabric air permeability. In order to achieve the objective of the research, sound absorption coefficient of struto nonwovens was determined via impedance tube method, the average value of sound absorption coefficient (α?) was calculated. Air permeability of struto nonwovens was examined by using FX3300 Textech Air Permeability Tester. Results showed that struto nonwoven exhibited good absorption ability at frequency bands 3000-6400 Hz while it was ineffective for frequency lower than 3000 Hz. Struto nonwovens with high GSM and fabric thickness showed better acoustic performance and lower air permeability. It was observed that α? was inversely proportional to air permeability, with correlation coefficient 0.95. It was concluded that air permeability can be used as a criterion of sound absorption behavior of struto nonwovens. A lower air permeability suggests a better sound absorption performance for struto nonwoven fabrics. 相似文献
9.
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