Potatoes destined for making chips, French fries and other fried products, need to have low sugar content to avoid browning of the finished. Sede de Gobierno de la Universidad Nacional de Rosario In SS, YIELD and WG values were inferior to those corresponding to the other dates of .. de Cs. Médicas - UNR E-mail:[email protected] .. precursor and diagnostic mutagen in the Ames test with the addition of metabolic activation was . IVLaboratório de Biologia Computacional e Sistemas, Instituto Oswaldo + Corresponding author: [email protected] . IU/L. Clinical and laboratory checkups were performed more frequently when hepatitis symptoms . but also acetylhydrazine, the immediate precursor of toxic intermediates, to harmless.
Twenty female whiteflies were used for each bean species. Results and Discussion Adult feeding and oviposition preference When given a choice, significantly more B. The preference for soybean over garden bean in terms of both number of whiteflies attracted and oviposition could be possibly due to differences in physical and chemical characteristics of the leaves of the two bean species.
In general, hairy plant species have been found to be preferred over globrous ones up to a certain level when hairiness begins to interfere with feeding and attachment of eggs to the leaf epidermis.
This premise was supported by Butler and Wilsonwho reported that B. In the present study, B.
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Adult feeding and oviposiiton preferences of Bemisia tabaci on soybean and garden bean Immature development and survivorship Bemisia tabaci developed almost 3 days faster on soybean The reported mean developmental time for B. Generally, developmental time vary greatly with temperature and host plant. In view of this, Coudried et al.
For instance, mean duration in days varied among hosts: Estimates for survivorship of immatures were significantly different, The mechanisms that determine B. Those include plant colour, texture, free metabolites in the sap, quantity of trichomes in the leaves, and nutritional state, among others Van Lenteren and Noldus ; Bentz et al.
The combination of these factors with abiotic agents for adult dispersal wind, for example may determine differential oviposition between plant species in the field Byrne Additionally, whiteflies can show some degree of variability in the preference for host plants depending on the time, season, environmental conditions and agronomic practices Gerling Considering the short developmental time of B.
Adult emergence occurred from 16—20 days after oviposition on G. Development of immature stages of Bemisia tabaci on soybean and garden bean reared in the laboratory Adult longevity and fecundity Adult longevity was recorded as part of the fecundity experiment. Although most females died by day 13 and 17 on garden bean and G. These means were however not too different from the range 10—15 days reported by Gerling et al.
Daily survivorship of Bemisia tabaci on Glycine max and Phaseolus vulgaris in the laboratory Stage-specific survival of Bemisia tabaci on soybean and garden bean in the laboratory A preoviposition period of 1day was recorded in the fecundity experiment which is consistent with that reported by Powell and Bellow for B. Females laid an average of The reason for the difference in fecundity on the two bean species might possibly be attributed to difference in the external physical characteristics of the leaf surface hairiness and the internal chemical characteristics of the leaves pH of leaf sapwith the sap of G.
Longevity of Bemisia tabaci on soybean and garden bean Life table Results from the development and fecundity experiments were used to develop lx-mx life tables for B.
These tables were used to calculate demographic parameters shown in Table 6. The net reproductive rate Ro of B. The reproductive rate on P. The generation time Tc of B.
The recorded value on G. The intrinsic rate of natural increase rm for G. The recorded rm value on P. Fecundity of Bemisia tabaci on soybean and garden bean Table 6. Life table parameters of B. Thus, to compare the population growth of B. Given a stable age distribution, the estimated whitefly population on G. Given these life history parameters, whitefly populations would be expected to build up relatively slowly on P. The relatively poor host attribute of P. This suggests that at the temperature under consideration, E bimaculata could intrinsically control B.
Differences in plant infestation will thus be a combination of host preference for oviposition, host suitability for insect development, and the combination effects of natural enemies and other causes of death. Acknowledgments We would particularly like to thank Prof.
The community-wide and guild-specific effects of pubescence on the folivorous insects of manzanitas Arctostaphylos spp. Nitrogen fertiliser effect on selection, acceptance and suitability of Euphorbia pulcherrima Euphorbiaceae as host plant to Bemisia tabaci Homoptera: Current status of Bemisia tabaci as a plant pest and virus vector in agro- ecosystems worldwide.
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A phylogeographical analysis of the Bemisia tabaci species complex based on mitochondrial DNA markers. Their bionomics, pest status and management. Biological control of Bemisia tabaci using predators and parasitoids. The morphology of whiteflies. Aleyrididae in the United States history, pest status and management.
Recent Research in Developmental Entomology 2: Google Scholar Heinz KM. Predators and parasitoids as biological control agents of Bemisia in greenhouses. Taxonomy, Biology, Control and Management, pp. Pharmacokinetic studies have shown that the serum concentration of hydrazine is significantly higher in slow acetylators than in rapid acetylators, likely due to the high concentration of INH.
The high amount of INH disposed of through this pathway is likely to lead to enhanced hydrolysis to hydrazine because the rate of metabolic conversion of INH to acetylisoniazid is lower in slow than in rapid acetylators Sarma et al. All of these drug disposal processes may support the finding that slow acetylators are prone to INH-induced hepatitis. Few studies have reported the absence of a relationship between acetylation status and hepatitis during TB treatment Singh et al. Here, genotyping of the NAT2 gene was performed by sequencing, overcoming the possible problems of misclassification of the acetylation status.
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Another important aspect to be considered here is that in our study, patients were treated with mg of INH instead of the mg used in the study conducted by Vuilleumier et al. CYP2E1, one of the cytochrome P enzymes, may convert acetylhydrazine into hepatotoxins that affect anti-TB drug-induced hepatotoxicity.
However, a recent study in a Korean population did not confirm those results Cho et al. In the studied population, in contrast with the findings for the Taiwanese population Huang et al. Therefore, further studies with a larger sample size should be performed in the Brazilian population to better evaluate the relationship between the CYP2E1 genotypes and adverse reactions during TB treatment.
Indeed, Roy et al. Recently, Huang et al. In contrast, the presence of the homozygous GSTT1 null polymorphism was similar between the cases and the controls in both studies. However, the same analysis in Spanish TB patients showed an opposite effect; the homozygous GSTT1 null polymorphism was highly associated with anti-TB drug-induced hepatotoxicity and no significant associations were found between the homozygous GSTM1 null polymorphism and hepatotoxicity Leiro et al.
Therefore, further studies should be performed to evaluate the role of these genetic factors in the susceptibility to hepatitis occurrence. To our knowledge, this is the first study in which the four candidate genes, which are known to be involved in the INH metabolic pathway, were evaluated simultaneously as risk factors for anti-TB drug-induced hepatitis in an admixed population. Here, the decision to exclude other variables that are potentially associated with hepatitis was pursued to confirm the association of genetic factors with the key outcome.
Genotyping interindividual variability at the NAT2 locus as an additional laboratory tool to predict anti-TB drug-induced hepatitis and other side effects is an emerging reality and will help not only in the determination of the most suitable dosage for individual patients, but also in the reduction of necessary outpatient visits and hospitalisations.
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