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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 20 of 70 for “"Oocysts"”.
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Molecular and genetic analysis of Cryptosporidium spp. oocysts : sources and genotypes in the environment
… more is known, presence of any Cryptosporidium oocysts in the environment should be considered a potential public health risk. Cryptosporidium spp. can infect a wide range of animal hosts, and environmental sources may include wildlife, agricultural animals, or human sewage. Transmission of …
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Evaluation of chemical treatments and ozone on the viability of Cryptosporidium parvum oocysts in fruit juices
… as unpasteurized apple cider, with infective oocysts may occur as oocysts are shed in the feces of common ruminants like cattle and deer that graze in and around orchards. Cryptosporidiosis can result in a severe illness for previously healthy individuals and a life-threatening illness in …
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Neospora Caninum: Oocyst Production in Dogs, Infection of Pregnant Cows With Oocysts, and Transmission Between Wild and Domestic Animals
… shed significantly greater numbers of N. caninum oocysts than dogs fed experimentally infected mouse carcasses. As few as 300 oocysts were used to infect calves, and N. caninum was cyclically transmitted between dogs and cattle. These data indicate that a single dog can potentially infect hundreds …
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A Comparative Study of Synergistic Effects in Sequential Inactivation of Cryptosporidium Parvum Oocysts and Bacillus Subtilis Spores With Chemical Disinfectants
… for the control of Cryptosporidium parvum oocysts in drinking water treatment, very limited work has been done on identifying and characterizing the interactions among chemical disinfectants and oocyst components involved in parasite inactivation. Furthermore, no definitive mechanistic …
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Effect of Metabolic Enzymes on Amylopectin Content and Infectivity of Cryptosporidium parvum
… infectivity of Cryptosporidium parvum oocysts/sporozoites in both fresh oocysts and stored oocysts. In addition, glycolytic enzymes and substrates: glucose, glucose-1-phosphate, and glycogen synthase were investigated to determine if they can be used to increase amylopectin stores and …
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Roles of surface interaction on Cryptosporidium parvum oocyst transport in subsurface environment
… surface properties on transport of C. parvum oocysts and microspheres was studied with a radial stagnation point flow (RSPF) cell and 2-dimensional (2-D) micromodels. The quartz or natural organic matter coated quartz surfaces were used as collector in the RSPF cell. The cylindrical silica …
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Cultivation of Eimeria Dispersa in Bobwhite Quail Embryos
The problem. To redescribe the sporulated oocysts of Eimeria dispersa from the Bobwhite quail (Colinus virginianus), to study the endogenous development of E. dispersa in Bobwhite quail embryos, and to examine the cross-transmission properties of this species for turkeys, chickens, and Japanese …
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Effects of Marek's Disease Herpesvirus and Turkey Herpesvirus Upon Immunity to Eimeria Acervulina in Young Chickens
… primary and secondary exposures to E. acervulina oocysts in young chicks infected with either MDHV or HVT. Procedure. Groups of chickens were inoculated with either MDHV or HVT. These chicks received a primary immunizing series of inoculations with E. acervulina oocysts. Individual chick weights …
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Factors affecting Plasmodium falciparum sporozoite formation in Anopheles mosquitoes
… for dissection. Microdissection of single oocysts from the infected midguts and the employment of polymerase chain reaction techniques allowed the products of self- and cross-fertilisation to be distinguished, and the number of genomes per oocyst to be counted. Utilising these methods …
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Characterization of pathogen transport in overland flow
… runoff are each analyzed for infective C. parvum oocysts and infective rotavirus particles using cell-culture infectivity assays. Results show that vegetation reduces the recovery of infective oocysts in surface runoff by an average of 62% and rotavirus particles by an average of 73%, in addition …
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The Life Cycle and Pathogenicity of Isospora Suis in Gnotobiotic and Conventionalized Piglets
… inoculated orally with 2.4 x 10('5) sporulated oocysts. The effects of a "normal" bacterial intestinal flora on the infection was determined by conventionalization of some germfree piglets with a pathogen-free bacterial preparation. Piglets were killed and necropsied at 3, 4, 5, 6, 8, 9, 10, 11, …
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A Cytological Study of the Sporozoites of Eimeria Caviae, a Coccidian Parasite of the Domestic Guinea Pig, Cavia Porcellus
… pathology, and the morphological features of the oocysts of this species are also reported. Procedure. Oocysts of Eimeria caviae, isolated from naturally infected guinea pigs, were excysted in vitro and the sporozoites studied in fresh and stained preparations. Fresh sporozoites were studied in …
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Prevalence of Coccidia in Game-Farm Reared Pheasants in Iowa
… ending June 3, 1973, were examined for coccidian oocysts. The number of oocysts per gm. of feces was determined for each week's sample by using a modified McMaster's helminth egg counting technique, and the proportion of the Eimeria species present in the block was determined by performing …
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Cryptosporidium sp. and Giardia sp. in the St. Lawrence River: Impact on drinking water quality.
… River, and (d) to determine whether C. parvum oocysts aged (or stressed) in raw water are more susceptible than fresh oocysts to chlorine and monochloramine disinfection. Twelve sampling sites were chosen on the St. Lawrence River (between Morrisburg and Lancaster, Ontario), consisting of eight …
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NEW PERSPECTIVES IN LIVESTOCK NUTRITION TO IMPROVE HEALTH AND PERFORMANCE
… (EOC) to inhibit sporulation and thus to prevent oocysts from becoming infectious in Holstein dairy calves (Chapter 7). Therefore, the beneficial effects of yeasts and yeast derived products in horse nutrition have been firstly reviewed (Chapter 3). Then an in vivo trial (Chapter 4) was performed …
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Lifecycle Progression And The Sexual Development Of The Apicomplexan Parasite Cryptosporidium Parvum
… host lifecycle. Ingested meiotic spores called oocysts release invasive sporozoites in gut. Sporozoites infect intestinal enterocytes where parasites multiply asexually followed by sexual differentiation. Parasites have sex and then undergo sporulation in the host to produce mature oocysts. …
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Quantifying uncertainty in pathogen removal, membrane integrity monitoring and health consequences in the treatment of drinking water
… Analysis, to examine uncertainty in removal of oocysts of Cryptosporidium and viruses in membranes used to treat drinking water. In chapter 2, we examined variability and uncertainty in the determination of parameters used in pressure-based direct integrity tests of hollow fiber micro- and …
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Characterizing Cystoisospora canis as a Model of Apicomplexan Tissue Cyst Formation and Reactivation
… of C. canis in beagles and quantified the oocysts shed. We found this isolate had similar infection patterns to other C. canis isolates studied. We were able to superinfect beagles that came with natural infections of Cystoisospora ohioensis-like oocysts indicating that little protection …
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Trace Element Interrelationships and Zinc Status of the Chicken as Affected by Eimeria Acervulina Infection
… of 4 x 10('5) sporulated E. acervulina oocysts on days 0, 3, 6, 9 and 12 of the 14-day assay periods.
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