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A collection of academic publications by faculty and staff, both before and during their time at UPEI.

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8276 - 8300 of 8332
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We study the shuffle quotient operation and introduce equivalence relations it defines with respect to a (regular) language. Corresponding to an arbitrary shuffle decomposition we construct a normalized decomposition that is defined in terms of maximal languages. Using closure properties of the norm...
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We introduce a right congruence relation that is the analogy of the Nerode congruence when catenation is replaced by shuffle. Using this relation we show that for certain subclasses of regular languages the shuffle decomposition problem is decidable. We show that shuffle decomposition is undecidable...
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A cover-automaton A of a finite language L⊆Σ∗ is a finite deterministic automaton (DFA) that accepts all words in L and possibly other words that are longer than any word in L. A minimal deterministic finite cover automaton (DFCA) of a finite language L usually has a smaller size than a minimal...
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A string x is random according to Kolmogorov [10] if, given its length, there is no stringy, sensibly shorter than x, by means of which a universal partial recursive function could produce x. This remarkable definition has been validated in several ways (see [12, 14, 2, 11]) including a topological ...
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A reverse transcription and polymerase chain reaction method was developed and used to detect fecal excretion of enterotropic mouse hepatitis virus (MHV). A nested set of primers for polymerase chain reaction was located in the polymerase region of the MHV genome. The assay was used to follow the ti...
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We have performed a genomic characterization of a kinetoplastid protist living within the amoebozoan Neoparamoeba pemaquidensis. The genome of this "Ichthyobodo-related organism" was found to be unexpectedly large, with at least 11 chromosomes between 1.0 and 3.5 Mbp and a total genome size of at le...
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A combination of 16S rRNA sequencing and random amplified polymorphic DNA (RAPD) analysis was used to evaluate the genetic diversity within Aerococcus viridans var. homari, the causative agent of gaffkemia in lobsters. A collection of 7 A. viridans var. homari strains and 2 avirulent A. viridans-lik...
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The intermediate hosts for Sarcocystis rileyi (Stiles 1893) Minchin 1913 are ducks (Anas spp.), and the striped skunk (Mephitis mephitis) is its definitive host. The structure of sarcocysts from an experimentally infected shoveler duck (Anas cylpeata) fed sporocysts from an experimentally-infected M...
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Hemocytes of the American lobster (Homarus americanus H. Milne Edwards) were classified after examination of Wright-Giemsa stained cytocentrifuge preparations by brightfield light microscopy. Eleven hemocyte types were identified using morphologic criteria. The classification system was then used to...
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Two cases of Amoeba-like infections in cultured warmwater marine fish are described, a systemic infection in pompano T. falcatus from Singapore and a gill infection in Mediterranean (Greece) sea bream S. auratus. All pompano showed marked systemic infection of Amoeba-like parasites in the gills, kid...
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The Canadian lobster industry holds lobsters Homarus americanus in captivity for various periods to supply markets with live product year-round. Mortality during holding results in considerable losses, estimated at 10 to 15 % yr(-1) by the industry. This study examined the prevalence of Anophryoides...
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The concentration of arginine kinase (AK) in the hemolymph of lobsters may aid in the identification of muscle diseases in these animals in the same way that creatine kinase activity in blood plasma does in mammalian species. Both manual and automated analysis methods were developed for measuring AK...
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Potassium chloride (KCl: 330 mg/ml) was assessed as an euthanasia agent in American lobsters (Homarus americanus). Two groups of 10 lobsters (408.2 to 849.9 g) were maintained at 11.9 to 12.1 degrees C ('warm') and 1.5 to 2.5 degrees C ('cold') to evaluate the possible effect of ...
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A tetrazolium-based cytotoxicity assay was modified to determine the anti-protozoal activity of compounds towards the lobster parasite A. haemophila. To obtain reproducible results, A. haemophila maintained in continuous culture were preferable to freshly isolated A. haemophila. It was also found th...
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Recent (1993) landings of American lobsters (Homarus americanus) were valued at $294 million (Can.) in Canada and $213 million (Can.) in the United States. However, post-harvest losses are estimated at $50-75 million (10-15%) annually. The lobster fishery is one of the few remaining viable tradition...
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We have determined the nucleotide sequence of the nuclear gene encoding small-subunit ribosomal ribonucleic acid of the ciliate Anophryoides haemophila, a parasite of the American lobster Homarus americanus. The gene is 1763 bp in length, and has a guanosine-plus-cytosine content of 43.9%. Inferred ...
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Reverse transcriptase (RT) activity has been reported in bivalves affected by haemic neoplasia (HN). Since all retroviruses have RT, detection of RT activity was regarded as evidence for the retroviral etiology of HN. This study investigates the relationship between RT levels and the progress of HN ...
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Infection with bovine herpesvirus type 1 (BHV-1) occurs worldwide and causes serious economic losses due to the deaths of animals, abortions, decreased milk production, and loss of body weight. BHV-1 is frequently found in bovine semen and is transmitted through natural service and artificial insemi...
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Interaction of native proteinaceous antigens during the recognition and the effector phases of an immune response leads to antigenic conformational modifications which may elicit additional specific immune response. Protein cross-linking and conformation restraining formaldehyde and glutaraldehyde h...
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A nested reverse transcriptase PCR (RT-nPCR) was developed for the detection of feline coronavirus (FCoV) RNA in the feces, tissues, and body fluids of infected cats. The RT-nPCR was targeted to the highly conserved 3'-untranslated region of the viral genome and will detect most, if not all, feline ...
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Antibody-induced conformational changes of proteins have been recently frequently suggested to explain a variety of observations. In spite of the fundamental importance of this phenomenon for both in vivo and in vitro antigen-antibody interactions, it is not generally accepted because of the lack of...
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BACKGROUND: The weather may be a barrier to physical activity but objective assessment of this hypothesis is lacking. Therefore we evaluated the effect of temperature, rain or snow, and wind speed on the daily physical activity of adults. METHODS: This report contains data from 25 males (BMI (mean +...
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Activation of T lymphocytes requires the recognition of peptide–major histocompatibility complexes (MHCs) and costimulatory signals provided by antigen-presenting cells (APCs). It has been shown that T-cell activation without costimulation can lead to anergy. In this study, we developed a novel st...
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