The incidence of dengue in Malaysia has shown an increasing trend since the year 2000. Vector control is the primary approach for dengue control in Malaysia. There is an urgent need for new or modified approaches such...
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The incidence of dengue in Malaysia has shown an increasing trend since the year 2000. Vector control is the primary approach for dengue control in Malaysia. There is an urgent need for new or modified approaches such as the residual spraying on the outer walls that can potentially last long enough to control the Aedes population, particularly in the outbreak-prone areas. In this field study, we conducted outdoor residual spraying (ORS) using a newly formulated polymer-enhanced suspension concentrate (SC-PE) of deltamethrin. The objectives of this study were to evaluate the efficacy of ORS using deltamethrin SC-PE and its effect on wild Aedes populations and to assess its residual bio-efficacy on painted cement walls against the pyrethroid-susceptible strains of laboratory-reared Aedes mosquitoes. Three rounds of spraying in a four-month cycle were conducted between 2014 and 2015 in four residential areas (low-rise and high-rise housing types) in hulu Langat, Selangor. The bio-efficacy of the insecticide was evaluated by assessing its impact on vector population using ovitrap surveillance. Standard WhO wall deposit bioassay was adapted to determine bio-efficacy of deltamethrin, i.e. post 30 min knockdown and post 24 h mortality after exposure. During the treatment period, we observed significant reductions in the population of Ae. albopictus in the sprayed low-rise housing in both semi-indoor and outdoor environments, while in the high-rise housing, there was also a significant decline in Ae. aegypti population in the semi-indoor environment. The evaluation of the residual bio-efficacy of deltamethrin SC-PE against laboratory-reared Aedes mosquitoes showed that the insecticide lasted longer in the high-rise housing compared to the low-rise housing with >80% mortality achieved continuously for 16 weeks. We provide initial evidence on residual efficacy of deltamethrin SC-PE in reducing Aedes population size in the low-rise and high-rise housing. Our results showed tha
This study reports the effects of Oryza sativa AUXIN BINDING PROTEIN57(OsABP57)overexpression towards flooding in ***57 was previously reported to activate plasma membrane h+-*** studies address the ability of transge...
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This study reports the effects of Oryza sativa AUXIN BINDING PROTEIN57(OsABP57)overexpression towards flooding in ***57 was previously reported to activate plasma membrane h+-*** studies address the ability of transgenic OsABP57 overexpression in enduring drought and salinity stresses but none on the *** this study,complete submergence analysis was carried out and several morphophysiological parameters were analyzed such as plant height,root architecture and relative chlorophyll *** showed that there are no differences between OsABP57 overexpression rice compared to MR219 control rice in terms of chlorophyll content and plant height after 1-3 weeks of flooding *** analysis,however,found that transgenic rice OsABP57 produced more adventitious roots compared to MR219 rice under normal condition,which may be due to the role of the gene that encodes for auxin binding *** semi-quantitative polymerase chain reaction(PCR)on Oryza sativa pyruvate decarboxylase(OsPDC)gene after two weeks of flooding treatment showed an increase of expression in OsABP57 transgenic compared to ***,the overexpression of OsABP57 did not show any significant difference in terms of morphophysiological analysis between the transgenic line and MR219,yet,there is an increase of OsPDC gene in the transgenic background which may need further experimental analysis in the future to map the network between auxin and hypoxia core genes.
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