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Biomedical subjects

D A Pass

Publications and source records attributed to D A Pass.

44 records · Page 3Linked to original sources
PubMed1971

Wide distribution of Pasteurella haemolytica type 1 over the nasal mucosa of cattle.

Studies on the site of proliferation of Pasteurella haemolytica in the bovine nasal cavity have been carried out.P.haemolytica were isolated from 15 selected major anatomical areas of the nasal cavity in calves with high numbers of P.haemolytica following shipment from Western Canada. When the organisms were present in the nasal cavity of live animals in low numbers, they were isolated from many, but not all, areas. P.haemolytica was isolated post mortem from one or more selected areas of several nasal cavities in spite of negative antemortem cultures. By the direct fluorescent antibody technique, P.haemolytica was demonstrated at the surface of nasal epithelial cells. Organisms were not seen in or between epithelial cells nor in the ducts nor alveoli of glands. The findings were similar when high and low numbers of P.haemolytica were present in the nasal cavity.

Animals↗
PubMed1971

Regional histological variations of the nasal mucosa of cattle.

Aspects of the histology of the nasal mucosa of calves from four to six months of age have been described. The functional significance of the type of epithelium, its thickness, the degree of neutrophil invasion, and its relationship to the numbers of Pasteurella haemolytica in the nasal cavity have been discussed. In addition, the arrangement and depth of glands in the lamina propria and the presence of lymph follicles have been described.

Analysis of Variance↗
PubMedDate not supplied

The influence of dietary calcium and phosphorus on tibial dyschondroplasia in broiler chickens.

The incidence and severity of tibial dyschondroplasia in broiler chickens were increased by feeding rations containing high levels of phosphorus relative to the level of calcium. Tibial dyschondroplasia was not eliminated by feeding a ration containing 1.5% calcium and 0.5% available phosphorus. Before typical dyschondroplasia developed, chickens fed a high level of phosphorus had uniformly thickened growth plates at 2 weeks of age. The majority of this thickening was due to an increase in the zone of proliferation, identical to that which occurs in calcium-deficiency rickets.

Animals↗
PubMedDate not supplied

Chronic rhinitis and sinusitis in budgerigars (Melopsittacus undulatus).

The microscopic lesions in the nasal cavity, nasal bones, and infraorbital sinuses of five budgerigars with chronic upper respiratory tract infection are described. All five had chronic inflammation of the lining of the air spaces within the bones surrounding the nares and infraorbital sinuses.

Animals↗
PubMedDate not supplied

A papova-like virus infection of splendid parakeets (Neophema splendida).

The lesions associated with a papova-like virus infection in two splendid parakeets (Neophema splendida) are described. The most obvious microscopic lesion in both birds was enlargement of renal medullary collecting-duct epithelial cells. The nuclei of these cells were also enlarged, pleomorphic, and often bizarre, and intranuclear and intracytoplasmic virus-like particles (48 nm in diameter) were demonstrated within them. One bird also had a hepatopathy characterized by hepatocyte enlargement and nuclear pleomorphism.

Animals↗