In a study published in the open access journal BMC Biology, researchers show that its effectiveness against a number of susceptible Lepidopteran species depends on the presence of the normally "friendly" bacteria that colonise their guts. Without these bacteria, the Bt toxin can become impotent in some species.
A team of researchers from the University of Wisconsin studied the effects of wiping out the commensal gut bacteria using antibiotics in six moth and butterfly species. In five of these species, the antibiotic treatment protected the insects against the lethal effects of the toxin, and in four of the five species, replacing the gut bacteria caused the toxin to become effective again. Graduate student Nichole Broderick said, "Our results suggest that Bt may kill some insects by causing otherwise benign gut bacteria to exert pathogenic effects. If the insects don't have these bacteria present, the toxin may be ineffective".
According to the authors, "We've shown that larval enteric bacteria affect susceptibility to Bt, and the extent of this impact varies across butterfly and moth species. This does not exclude other factors, including the insect host, B. thuringiensis strain, and environmental conditions. In some cases these factors may interact, for example, host diet can alter the composition of enteric bacteria".
They conclude, "From a pest management perspective, the ability of a non-specific enteric bacterium to restore B. thuringiensis-induced mortality of some Lepidopteran species may provide opportunities for increasing susceptibility or preventing resistance".
Charlotte Webber | EurekAlert!
Water forms 'spine of hydration' around DNA, group finds
26.05.2017 | Cornell University
How herpesviruses win the footrace against the immune system
26.05.2017 | Helmholtz-Zentrum für Infektionsforschung
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
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Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
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Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
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An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
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26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
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