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9 results for “Insecticidal protein”
Fig. 3 in Susceptibility of Spodoptera frugiperda (Lepidoptera: Noctuidae) field populations to the Cry1F Bacillus thuringiensis insecticidal protein
Fig. 3. Mean percentage of mortality and mean percentage of growth inhibition responses of Spodoptera frugiperda for 2012 and 2013 field-collected populations exposed to Cry1F Bacillus thuringiensis toxin.
Fig. 1 in Susceptibility of Spodoptera frugiperda (Lepidoptera: Noctuidae) field populations to the Cry1F Bacillus thuringiensis insecticidal protein
Fig. 1. EC50s estimated by nonlinear regression of growth inhibition fitted to a probit model and the 95% confidence intervals of Spodoptera frugiperda neonates field collected in 2012 and exposed to the Cry1F Bacillus thuringiensis toxin.
Fig. 2 in Susceptibility of Spodoptera frugiperda (Lepidoptera: Noctuidae) field populations to the Cry1F Bacillus thuringiensis insecticidal protein
Fig. 2. EC50s estimated by nonlinear regression of growth inhibition fitted to a probit model and the 95% confidence intervals of Spodoptera frugiperda neonates field collected in 2013 and exposed to the Cry1F Bacillus thuringiensis toxin.
JAK/STAT signaling regulated intestinal regeneration defends insect pests against insecticidal proteins produced by Bacillus thuringiensis
<p><span>A variety of coordinated host-cell responses are activated as defense mechanisms against pore-forming toxins (PFTs). <em>Bacillus thuringiensis</em> (Bt) is a widely used biopesticide whose efficacy and precise application methods limit its use to replace synthetic pesticides in agricultural settings. Here, we analyzed the intestinal defense mechanisms of two lepidopteran insect pests after intoxication with a sublethal dose of Bt PFTs to find out potential target genes for reduction of defense responses using dsRNA to silence their expression. We show that larval intestinal epithelium was initially damaged by the PFTs and that </span><span>larval survival</span><span> was observed after intestinal epithelium regeneration</span><span>. Further analyses showed that the proliferation and differentiation of intestinal stem cells after Bt </span><span>toxins</span><span> treatments were regulated through JNK and JAK/STAT signaling pathways. Repression of intestinal regeneration by treating specific dsRNA led to increased toxicity of Bt PFTs to both <em>Chilo suppressalis </em>and Spodoptera<em> frugiperda</em>. Consequently, a nano-biopesticide was designed to improve pesticidal efficacy based on the combination of dsRNA-nanoparticles with </span><span>Bt</span><span> bacterial strains. This formulation efficiently controlled insect pests suggesting its potential use to reduce the use of synthetic pesticides in agricultural settings for pest control. </span></p>
Palatability of Insecticides and Protein in Sugar Solutions to Argentine Ants
<p>This is the Raw Data and R Markdown statistics for BioRxiv and Pest Management Science Journal.</p> <p>Title: Palatability of Insecticides and Protein in Sugar Solutions to Argentine Ants</p> <p>Summary: </p> <p><span>Invasive ant species like <em><span>Linepithema humile</span></em> cause significant ecological and economic harm, making effective control strategies essential. Insecticide baits are currently the most effective approach for controlling ants. </span><span>Therefore, quantifying how palatable or unpalatable baits, bait additives, or toxicants are, is critical for developing effective control methods.</span><span> </span><span>It has recently been demonstrated that in the comparative evaluation of foods, animals that are aware of both a test food and a comparator food exhibit greatly increased sensitivity when detecting the unpalatability of liquid baits. </span><span>Here, we deploy a newly developed comparative evaluation methodology to examine the palatability to <em>L. humile </em>workers of three toxicants used in invasive ant control: Fipronil, spinosad, and imidacloprid, as well as egg white protein.</span></p> <p><span>Ants showed no significant preference between pure sucrose and sucrose-toxicant solutions, indicating that they either cannot detect the toxicants or that they do not find them distasteful. </span><span>Survival tests confirmed that the toxicant concentrations used were lethal, with a survival rate of 50% or below after 72 hours. However, ants found egg protein additive unpalatable, significantly preferring pure sucrose to a sucrose-egg protein mix.</span></p> <p><span>These findings confirm that three major toxicants are suitable for use in baits, and that reported abandonment or avoidance of toxic baits is not due to the unpalatability of these toxicants. However, the addition of egg protein to sucrose baits, even at ratios which optimise colony growth, is likely counterproductive. Future research should investigate the relative preference of invasive ants for various bait matrixes over naturally available food, ensuring more effective pest management strategies.</span></p>
JAK/STAT signaling regulated intestinal regeneration defends insect pests against insecticidal proteins produced by Bacillus thuringiensis
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Data from: The adsorption features between insecticidal crystal protein and Nano-Mg(OH)2
Nano-Mg(OH)2, with low biological toxicity, is an ideal nano-carrier for insecticidal protein to improve the bioactivity. In this work, the adsorption features of insecticidal protein by nano-Mg(OH)2 have been studied. The adsorption capacity could achieve as high as 136 mg/g, and the adsorption isotherm had been fitted with Freundlich model. Moreover, the adsorption kinetics followed pseudo-first or -second order rate model, and the adsorption was spontaneous and exothermic process. However, the high temperatures are not suitable to adsorption, which implies that the temperature would be a critical factor during the adsorption process. In addition, FT-IR confirmed that the protein was adsorbed on the nano-Mg(OH)2, the Zeta potential analysis suggested that insecticidal protein was loaded onto the nano-Mg(OH)2 not by electrostatic adsorption but might by intermolecular forces, and the circular dichroism (CD) spectroscopy of Cry11Aa protein before and after loading with nano-Mg(OH)2 was changed. The study applied the adsorption information between Cry11Aa and nano-Mg(OH)2, which would be useful in the real appilation of nano-Mg(OH)2 as a nano-carrier.
Data from: The adsorption features between insecticidal crystal protein and Nano-Mg(OH)2
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Data from: Stacked Bt maize and arthropod predators – exposure to insecticidal Cry proteins and potential hazards
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