排序方式： 共有13条查询结果，搜索用时 46 毫秒
1.
The recently registered insecticide, imidacloprid, was applied to three vegetable crops at 20 and 40 g AI ha−1. The persistence of the parent insecticide and its translocation, along with the quantification of the metabolites formed on these crops are presented. The parent insecticide dissipated with a half‐life of 3–5 days and persisted longest on mustard leaves. The detectable limit of the HPLC method was 0.01 µg g−1. The metabolites 1‐(6‐chloropyridin‐3‐yl‐methyl)imidazolidin‐2‐one and 6‐chloronicotinic acid were found to be translocated by day 10 in eggplant, cabbage leaves and mustard leaves but not in cabbage curd. The MRL of imidacloprid is not documented by the FAO/WHO on these crops and comparison of the MPI with the TMRC, calculated on the residue data generated in this study, establishes the safety of the schedule. © 2000 Society of Chemical Industry 相似文献
2.
In this work, we investigated the effects of various feeding treatments on the survival and growth of Huso huso and Acipenser persicus larvae during a 20‐day culture period. Three replicate groups (250 fish/replicate) of first‐feeding larvae were fed according to four main feeding regimes: (1) live food (live nauplii of brine shrimp Artemia urmiana); (2) indirect transition (5–7 days live food followed by gradual transition to formulated diet); (3) direct transition (using different combinations of live and formulated diet from the start feeding onwards); and (4) formulated feed (FD) from the start of feeding. In H. huso larvae, combining live food and manufactured diets (co‐feeding) from the first feeding stage onwards (direct transition) resulted in significantly higher weight gain than the other regimes. Survival was significantly higher in H. huso larvae fed solely live food or the direct transition regimes compared with indirect transition and FD. In A. persicus larvae, growth and survival were higher in the indirect transition feeding regime than in the other regimes. On the basis of the results of this study, we recommend co‐feeding of H. huso immediately from the commencement of exogenous feeding, but co‐feeding of A. persicus should start 7 days after prior feeding with live food. 相似文献
3.
The pure individual stereoisomers of endosulfan, alpha-endosulfan and beta-endosulfan, were applied as emulsifiable concentrates to chickpea crop at the rate of 175 g a.i. ha −1 and 50 g a.i. ha −1, respectively. The dissipation rate of these isomers revealed that alpha-endosulfan interconverted to beta-endosulfan in minor quantities, while it was converted into endosulfan sulfate on chickpea leaves in significant amounts. On application, beta-endosulfan was converted to endosulfan sulfate and alpha-endosulfan in relatively smaller amounts. The study indicates that the beta stereoisomer of endosulfan is more persistent because it is resistant to interconversion and metabolic change. 相似文献
4.
Reyhani Haghighi Sajjad Hosseininaveh Vahid Maali-Amiri Reza Talebi Khalil Irani Solmaz 《Gesunde Pflanzen》2021,73(4):495-507
Gesunde Pflanzen - Pistachio (Pistacia vera L.) is an economically important nut crop that is prone to drought stress since it is mainly produced in arid and semi-arid regions. Considering... 相似文献
5.
Lucelia Tessaro Talita Sarah Mazzoni Robie Allan Bombardelli Arno Juliano Butze Irani Quagio‐Grassiotto 《Aquaculture Research》2019,50(12):3507-3518
The reproductive dynamics of a species is important information to have for the maintenance and reproduction of animals in captivity, for either commercial or conservation purposes. Steindachneridion melanodermatum is an endemic fish that has been reproduced by breeding protocols, but knowledge related to the maturation and reproductive cycle of this species is scarce. The purpose of this research was to observe different parameters related to the reproductive biology of males born in captivity over a 24‐month period to determine the first maturation and reproductive activity of S. melanodermatum males maintained in captivity. Body development changes (weight and length) were observed, and gonadosomatic index (GSI) and plasma sex steroids (testosterone and 17β‐estradiol) were measured monthly. Phases of the reproductive cycle were detected based on macroscopic changes and histological observations of the testes. The obtained data were correlated, demonstrating that the GSI values accompanied testis development and sex steroid peaks. Additionally, immunohistochemistry was performed for the detection of KI‐67, 3β‐HSD and Vasa protein. Our data analysis indicated that the first maturity in males bred in captivity occurred after one year (at 22‐month‐old fish), with a reproductive period occurring from September to November, which is the spring season in the southern hemisphere. 相似文献
6.
Zahra Gorzin Ali Akbar Gorzin Alijan Tabarraei Naser Behnampour Shiva Irani Amir Ghaemi 《Iranian Biomedical Journal》2014,18(1):1-7
Backgrounds: Most of the hepatitis C virus (HCV) infections elicit poor immune responses and 75% to 85% of cases become chronic; therefore, the development of an effective vaccine against HCV is of paramount importance. In this study, we aimed to evaluate co-administration of HCV non-Structural Protein 2 and IL-12 DNA vaccines in C57BL/6 mice. Methods: A plasmid encoding full-length HCV NS2 protein (non-structural protein 2) was generated and used to vaccinate mice. Negative control (an empty expression vector) was also employed to evaluate the background response. To investigate immune responses against vaccine, C57BL/6 mice received three doses of the vaccine with a two-week interval. Cellular immunity was assessed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay for lymphocyte proliferation, lactate dehydrogenase release for cytotoxic T lymphocyte (CTL) activity and cytokine assay. Results: The findings demonstrated that immunization of mice with plasmid expressing HCV NS2 induced CTL response, interferon gamma production, and lymphocyte proliferation compared to negative control. The results also demonstrated that co-administration of IL-12 with the HCV NS2 plasmid induced significantly better immune response in C57BL/6 mice. Conclusion: DNA vaccine encoding HCV NS2 is an effective candidate that can trigger CTL-based immune response against HCV. In addition, the results suggested that combining the DNA vaccine approach with immune stimulatory cytokines may significantly enhance antigen-specific immune responses. Key Words: Hepatitis C virus (HCV), NS2 protein, DNA vaccine, IL-12 相似文献
7.
Extractable residues of endosulfan stereoisomers and its toxic metabolite, endosulfan sulfate, on a vegetable, an oilseed and a pulse crop were determined by gas-liquid chromatography. The study revealed that the alpha isomer degraded faster than the beta isomer. Beta-endosulfan accumulated during the first three days following the treatment. Endosulfan sulfate residues appeared a few days after application and decreased with time. The total endosulfan residues in the seeds from treated mustard ranged from 0.08 to 0.12 mg kg?1 and were at or below the limit of determination (0.02 mg kg?1) in chickpea seeds following harvest. 相似文献
8.
A field trial was conducted to study (i) whether there is interconversion of stereoisomers of hexachlorocyclohexane (HCH) on a plant and (ii) the rate of dissipation of lindane on chickpea in a sub-tropical climate. The lack of formation of the beta and delta isomers on application of pure alpha- or gamma-HCH showed that these stereoisomers of HCH did not interconvert on chickpea. The residues of the alpha and gamma isomers dissipated rapidly on chickpea leaves with half-lives of three and four days respectively. 相似文献
9.
Appraising the Shelf Life of Farmed Cobia,Rachycentron canadum,by Application of a Quality Index Method 
下载免费PDF全文
下载免费PDF全文 Fabíola Helena dos Santos Fogaça Marcondes Agostinho Gonzaga Junior Sidely Gil Alves Vieira Thais Danyelle Santos Araujo Emanuel Airton Farias Irani Alves Ferreira‐Bravo Thiago Fernandes Alves Silva Rodrigo Maciel Calvet Alitiene Lemos Moura Pereira Carlos Prentice‐Hernández 《Journal of the World Aquaculture Society》2017,48(1):70-82
Freshness is the main concern of seafood quality, and the principal method to evaluate seafood freshness is sensory evaluation. The aim of this work was to study the quality changes of cobia, Rachycentron canadum, under ice storage through sensory and physical analysis as well as bacterial counting of specific spoilage organisms (SSOs). In particular, the utilization of a quality index method (QIM) scheme was proposed. Samples stored for 0–30 d were analyzed with the QIM. Ten panelists observed and registered the changes occurring in the fish starting on day zero and ending when the fish were spoiled. After developing the scheme, 11 sensory attributes were described in 23 points, which detailed the appearance of skin, eyes, abdomen, gills, and flesh deterioration. The volatile nitrogen compound measurements and microbiological data of the SSOs determined a shelf‐life of 19 d for the samples. Sensory analysis showed a rejection point at 15.67 d of ice storage. The natural degradation of myofibrillar proteins and collagen was observed during ice storage. In conclusion, a shelf‐life of 15 d was defined for raw cobia stored on ice. 相似文献
10.
The persistence patterns of three synthetic pyrethroids—fenvalerate, tau-fluvalinate, lambda-cyhalothrin—and an organophosphorus insecticide, monocrotophos, on eggplant (Solanum melongena L.) have been evaluated. The extractable residues ranged from 0.05 to 0.45, 0.01 to 0.40, 0.003 to 0.09 and 0.09 to 0.32 μg g?1 for fenvalerate, tau-fluvalinate, lambda-cyhalothrin and monocrotophos, respectively. Fenvalerate was the most persistent among the four, followed by monocrotophos, lambda-cyhalothrin and tau-fluvalinate. The Maximum Residue Limit (MRL) of these pesticides on S. melongena has not yet been documented. The present data may be useful for establishing MRL and assessing the amount of pesticide residues in this vegetable. 相似文献