Publications by authors named "Philip Silva"

Biogas is produced by a consortium of bacteria and archaea. We studied how the microbiome of poultry litter digestate was affected by time and treatments that enhanced biogas production. The microbiome was analyzed at six, 23, and 42 weeks of incubation.

View Article and Find Full Text PDF

species are a normal flora of animals and humans. However, life-threatening opportunistic infections can be caused by antimicrobial resistant strains. Fecal ( = 42) and feed ( = 8) samples were obtained from a mink farm and cultured for the enumeration and detection of erythromycin-resistant (a macrolide; ERY)- and tetracycline-resistant (TET) enterococci.

View Article and Find Full Text PDF

Nontyphoidal is a leading cause of foodborne illnesses, and concentrated animal production such as commercial mink farming can be a reservoir. The objective of this study was to determine the prevalence, serotypes, antimicrobial resistance, virulence genes and mobile genetic elements, and phylogenetic characterization of from mink fecal ( = 42) and feed ( = 8) samples at a commercial mink farm in the United States. was detected from 11 (26.

View Article and Find Full Text PDF

Antibiotic-resistant infections caused by extended-spectrum β-lactamases (ESBLs) and carbapenemases are increasing worldwide. Bacteria resistant to extended-spectrum cephalosporins and last resort carbapenems have been reported from food animals and their environments. Other concentrated nonfood-producing animals such as mink farming can be a reservoir of bacteria resistant to these critically important antibiotics.

View Article and Find Full Text PDF

Objectives: Doppler velocity measurements are fundamental diagnostic criteria for vascular ultrasound examinations. Insonation angles are kept to 60° or less to minimize error. The purpose of this study was to assess variance of Doppler-detected peak systolic velocity (PSV) measurements in the internal carotid arteries at different angles (45°, 50°, 55°, and 60°) with different beam steering.

View Article and Find Full Text PDF

American mink () is a significant source of global fur production. Except for a few studies from Denmark and Canada reporting antimicrobial resistance in bacteria isolated from clinical cases, studies from the general mink population are scarce and absent in the United States. Mink feces ( = 42) and feed ( = 8) samples obtained from a mink farm were cultured for the enumeration and detection of tetracycline-resistant (TET)- and third-generation cephalosporin-resistant (TGC)-.

View Article and Find Full Text PDF

Objective: To determine the normal depth of the medial femoral sulcus on lateral radiographs of the knee and determine if abnormal deepening of the medial femoral sulcus exists as a radiographic indicator of intra-articular knee abnormalities.

Materials And Methods: A retrospective search was performed over a period of 10 years to identify all individuals with a bone contusion of the anterior medial femoral condyle at MR imaging. Study patients had documented acute knee injuries and radiographs 6 weeks or less prior to their MR.

View Article and Find Full Text PDF

Hypoxia and temperature are two major, interactive environmental variables that affect cardiovascular function in fishes. The purpose of this study was to determine if acclimation to hypoxia increases thermal tolerance by measuring cardiovascular responses to increasing temperature in two groups of channel catfish. The hypoxic group was acclimatized to moderate hypoxia (50% air saturation, a P(O2) of approximately 75 torr) at a temperature of 22° C for seven days.

View Article and Find Full Text PDF

An ion chromatography method with non-suppressed conductivity detection was developed for the simultaneous determination of methylamines (methylamine, dimethylamine, trimethylamine) and trimethylamine-N-oxide in particulate matter air samples. The analytes were well separated by means of cation-exchange chromatography using a 3 mM nitric acid/3.5% acetonitrile (v/v) eluent solution and a Metrosep C 2 250 (250 mm x 4 mm i.

View Article and Find Full Text PDF

Amines in fine particulate matter have been detected and quantified during ambient studies of winter inversions in Logan, UT, using aerosol mass spectrometry. Amine-related compounds account for 0.5-6 microg m(-3) of fine particulate mass during some wintertime periods.

View Article and Find Full Text PDF

In the UK, the National Institute for Clinical Excellence has recommended the use of neuraminidase inhibitors for elderly and at-risk patients who present with influenza-like illness within 36 hours of symptom onset. However, few data exist to enable primary care trusts to evaluate the logistics and costs of prescribing. We sought to determine, during a confirmed influenza outbreak, the proportion of eligible patients who currently present in time to benefit from treatment with a neuraminidase inhibitor, and to develop the findings into a model for evaluating potential prescribing costs.

View Article and Find Full Text PDF

The mechanisms responsible for altering cardioventilatory control in vertebrates in response to chronic hypoxia are not well understood but appear to be mediated through the oxygen-sensitive chemoreceptor pathway. Little is known about the effects of chronic hypoxia on cardioventilatory control in vertebrates other than mammals. The purpose of this study was to determine how cardioventilatory control and the pattern of response is altered in channel catfish (Ictalurus punctatus) by 1 week of moderate hypoxia.

View Article and Find Full Text PDF