M. van Alphen results 24
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Within patient horizontal gene transfer dynamics of a blaNDM−7 plasmid among four different bacterial speciesNARA Subscribed
Purpose We describe the case of a 73-year old male who was found to be a carrier of an bla NDM -producing Citrobacter freundii shortly after admission. During his admission, he developed abdominal abscesses and received multiple courses of piperacillin-tazobactam. In the following months, he was found to carry three other carbapenemase-positive species: Klebsiella oxytoca , Raoultella planticola and Serratia marscescens . Resu...
Capturing postural blood pressure dynamics with near-infrared spectroscopy-measured cerebral oxygenationNARA Subscribed
Orthostatic hypotension (OH) is highly prevalent in older adults and associated with dizziness, falls, lower physical and cognitive function, cardiovascular disease, and mortality. OH is currently diagnosed in a clinical setting with single-time point cuff measurements. Continuous blood pressure (BP) devices can measure OH dynamics but cannot be used for daily life monitoring. Near-infrared spectroscopy (NIRS) has potential di...
Purpose Antidepressants like the serotonin reuptake inhibitors (SRIs) are often used concomitantly with tamoxifen (e.g. for treatment of depression). This may lead to an additional prolongation of the QTc-interval, with an increased risk of cardiac side effects. Therefore we investigated whether there is a drug-drug interaction between tamoxifen and SRIs resulting in a prolonged QTc-interval. Methods Electrocardiograms (ECGs)...
W olbachia are endosymbiotic bacteria known to manipulate the reproduction of their hosts. These manipulations are expected to have consequences on the population genetics of the host, such as heterozygosity levels, genetic diversity and gene flow. The parasitoid wasp T etrastichus coeruleus has populations that are infected with parthenogenesis‐inducing Wolbachia and populations that are not infected. We studied the populatio...
Transposon proliferation in an asexual parasitoidNARA Subscribed
The widespread occurrence of sex is one of the most elusive problems in evolutionary biology. Theory predicts that asexual lineages can be driven to extinction by uncontrolled proliferation of vertically transmitted transposable elements (TEs), which accumulate because of the inefficiency of purifying selection in the absence of sex and recombination. To test this prediction, we compared genome‐wide TE load between a sexual li...
Genetic diversity and Wolbachia infection of the Drosophila parasitoid Leptopilina clavipes in western EuropeNARA Subscribed
Wolbachia are maternally transmitted bacteria that alter their arthropod hosts’ reproduction in various ways, including parthenogenesis induction (PI). Wolbachia ‐induced parthenogenesis can have drastic effects on the genetic structure of its host because it potentially reduces populations to clones without genetic exchange. However, Wolbachia ‐induced parthenogenesis does not inevitably result in a reduction of genetic varia...
Mate choice may play an important role in animal speciation. The haplochromine cichlids of Lake Victoria are suitable to test this hypothesis. Diversity in ecology, coloration and anatomy evolved in these fish faster than postzygotic barriers to gene flow, and little is known about how this diversity is maintained. It was tested whether recognizable forms are selection‐maintained morphs or reproductively isolated species by in...
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