Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Transovarial"”.
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Characterization of rickettsial infection dynamics within Dermacentor variabilis and Amblyomma maculatum
… fitness of A. maculatum, but not D. variabilis. Transovarial and transtadial transmission of rickettsiae was most successful for R. amblyommii and R. parkeri in both, A. maculatum and D. variabilis eggs, larvae, and nymphs. Maintenance of rickettsiae in both tick species via transstadial …
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THE MICROBIOME AND THE REPRODUCTIVE ECOLOGY OF Dermacentor variabilis AND Dermacentor andersoni IN WESTERN CANADA
… survival of larvae, larval behaviour, and transovarial transmission of bacteria by D. andersoni and D. variabilis. I also compared the microbiomes of engorged females, their eggs and larvae of the two species using next generation sequencing and quantitative PCR assays. The results showed a …
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The Epizootiology of Nosema Pyrausta (Paillot) in The European Corn Borer, Ostrinia Nubilalis, in Central Illinois
… levels were determined primarily by the transovarial input from the first moth flight, while second generation infection levels were determined by the interaction between horizontal transmission and the first generation input of N. pyrausta. An empirical threshold for horizontal …
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Transcriptional regulation of mosquito oogenesis
… is maintained in natural populations in part by transovarial transmission from infected females to their progeny. Our understanding of the innate immune response in mosquito ovaries is a fundamental step toward understanding the transmission cycle of LACV and other vertically transmitted …
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Molecular analysis of La Crosse virus transcription and replication in host cells
… LAC virus is maintained in nature through transovarial transmission from an infected female mosquito to her progeny. The potential molecular basis of these long-term, persistent, nonpathogenic infections was investigated in this dissertation. LAC virus primes transcription of its mRNA by …
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Overwintering Mechanisms of La Crosse Virus Vectors
… rodents and Aedes mosquitoes in Virginia. Transovarial transmission also occurs in this host-parasite system and has evolved for the virus to persist through winter. The virus perpetuates in diapause induced embryos and infects naive rodents the following spring. As global temperatures …
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Arthropod and vertebrate determinants for horizontal transmission of Rickettsia felis
… flea colonies is predominantly via vertical (transovarial and transstadial) transmission and mechanisms of horizontal transmission are undescribed. Studies are needed to describe both arthropod and vertebrate determinants of R. felis horizontal transmission. Here we describe the development of …
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Secondary Transmission Dynamics of the West Nile Virus in Mosquitoes
… component of this thesis was to investigate transovarial or transovum transmission (TOT) of WNV in Ontario during the 2012 and 2013 epidemic seasons. 89 males from 7 different traps were tested from samples collected in 2012. During the 2013 season individuals across 9 different WNV vector …
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Forest disturbance, mosquito vector ecology and La Crosse virus dynamics in southwestern Virginia
… human LACV risk is likely lowered by decreased transovarial vertical transmission. However, high chipmunk seroprevalence on disturbed sites suggest horizontal transmission with accessory vectors plays a larger role in LACV risk on recently logged sites.
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Bionomics of Ochlerotatus triseriatus Say (Diptera: Culicidae) and Aedes albopictus Skuse (Diptera: Culicidae) in emerging La Crosse virus foci in Virginia
… human case site, indicating the occurrence of transovarial transmission at this site. The supervised landcover classification for Wise County yielded a landcover map with an overall accuracy of 98% based on comparison of output classification with user-defined ground truth data. Posterior …
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Comparative Transmission and Pathogenesis of La Crosse Virus (LACV) Lineages and Evidence for LACV Circulation in Virginia Wildlife
… the Eastern Chipmunk (Tamias striatus) or via transovarial transmission from mother mosquitoes to offspring. Historically, LACV comprised two genetically distinct lineages: lineage I in the Midwest and Appalachian regions and lineage II in the southern region. Lineage I LACV is a growing public …