Goodbyes and hellos     

Ian Mason  David Lloyd 《Veterinary dermatology》1996,7(1):1-1

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Effects of season and lower ambient temperature on the structure of the sweat glands in anhidrotic horses     

D M Jenkinson  C Loney  H Y Elder  I Montgomery  D K Mason 《Equine veterinary journal》1989,21(1):59-65

Histological studies of the sweat glands of anhidrotic horses in the Hong Kong summer and under conditions of reduced thermal stress, both natural and controlled, were undertaken to determine if glandular regeneration occurs. Clinical data were collected for comparison with the histological results in each instance. Horses were assigned to one of three categories on the basis of the resulting change in the number of thin glandular profiles in a cooler environment. Group 1, which was classed as normal, had a low initial value, which was maintained. Group 2, typical of mild and moderately affected animals, had a high initial value, which fell markedly after as little as six weeks in the cool environment. Animals in Group 3, classed as severely affected, had a high initial value which remained high even after prolonged exposure to the cool environment. Light microscopical examination of the sweat glands in the heat, and after six weeks in a cool environment, provided a means of predicting the degree of anhidrotic severity and the potential for recovery in a cool climate. This was superior to clinical observation, although a diagnostic test based on glandular function is still required.  相似文献   

FATAL MEDIASTINAL HEMORRHAGE IN A DOG     

Gail D.  Mason  DVM  MA  Christopher R.  Lamb  MA  VetMB  Richard M.  Jakowski  DVM  PhD 《Veterinary radiology & ultrasound》1990,31(4):214-216

Rapidly fatal mediastinal hemorrhage in a previously healthy dog is described. The lesion was manifest radiographically by widening of the dorsal mediastinum. Although the exact origin of hemorrhage was not identified, it is hypothesized that one or more dorsal intercostal arteries were ruptured when the dog ran to an abrupt stop at the end of a long chain.  相似文献   

Salinomycin poisoning in point-of-lay turkeys   总被引：1，自引：0，他引：1  

GL. GRIFFITHS  P. HILLIER  RJ. SUTHERLAND† 《Australian veterinary journal》1989,66(10):326-329

Salinomycin poisoning occurred in a flock of 700 point-of-lay turkeys; 400 birds died over 7 days as a result of consuming feed contaminated with 50 ppm salinomycin. No gross lesions were detected. Histologic evidence of a myopathy was most readily detected in leg muscles of turkeys 5 to 7 d after ingesting salinomycin. Feeding trials were undertaken and individual susceptibility to the drug was found to vary greatly. In affected birds the plasma concentrations of creatine kinase (CK) and aspartate aminotransferase (AST) were found to be in the range of 500,000 to 2,500,000 IU/l and 9000 to 25,000 IU/l, respectively. The marked increase in the plasma activities of these enzymes preceded histological evidence of segmental muscle necrosis.  相似文献   

Epithelium- and mucosa-dependent relaxation and contraction of normal equine trachealis muscle in vitro     

L E Olson  S Z Perkowski  D E Mason  W W Muir 《American journal of veterinary research》1989,50(10):1720-1724

Strips of trachealis muscle were dissected from the mid-cervical portion of the trachea from horses that were free of respiratory tract disease. The epithelium and mucosa were removed from one group of tissues and were left intact in a second group of tissues. Each tissue was suspended in a bath filled with Krebs-bicarbonate solution that was aerated with 5% CO2 in oxygen and maintained at 37 degrees C. Isometric tension was continuously recorded. The contractile response to square-wave electrical stimulations increased as frequency (3, 5, 10, 15, 20, 25, and 30 Hz), voltage (10, 15, 18, and 25 V), and pulse duration (0.2, 0.5, 1.0, 1.5, and 2.0 ms) increased in tissues with the epithelium and mucosa intact. A stimulus of 18 V, 20 Hz, and 0.5 ms induced maximal contraction. Atropine (10(-6) M) abolished the response to 18 V and 0.5 ms at all frequencies. The increase in active isometric tension was concentration dependent when acetylcholine (10(-9) to 10(-4) M) was added to the baths in 0.5-logarithmic increments. Tissues that were contracted in response to acetylcholine (10(-5) M) had a concentration-dependent decrease in active isometric tension when isoproterenol was added to the baths in 0.5-logarithmic increments (10(-9) to 10(-4) M). The contraction and relaxation curves were qualitatively similar, but quantitatively different in tissues with and without the epithelium and mucosa. Removing the epithelium and mucosa increased the contractile response to acetylcholine at bath concentrations of 3.1 x 10(-7) M and 10(-6) M. The presence of epithelium and mucosa enhanced the magnitude of isoproterenol-induced relaxations.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Haematological measurements as an aid to early diagnosis and prognosis of respiratory viral infections in thoroughbred horses     

D K Mason  K L Watkins  J T McNie  C M Luk 《The Veterinary record》1990,126(15):359-363

In late November 1988 large numbers of thoroughbred horses in training in Hong Kong developed a transient pyrexia with, in some cases, the clinical signs of viral respiratory disease. Serial blood samples for haematological examination were taken from 10 of the horses which were stabled in six different blocks. They had developed a high temperature within three days of each other and subsequently seroconverted to equine herpes virus 1 (EHV1). The absolute monocyte count was more than 0.5 x 10(9)/litre in all 10 within the first five days, and nine of them had a high neutrophil/lymphocyte ratio on the first day, which then decreased and reversed within four or five days. Five of the horses had a high plasma viscosity, and a large difference between the viscosity of plasma and serum which in three of them returned to normal within 10 days. In the two and a half months after the initial infection six of nine of the horses, including the five which had a large difference between the viscosity of plasma and serum, developed visible mucopus by endoscopic examination. These haematological and endoscopic changes can be used to detect horses in the acute stages of EHV1 infection and monitor the progress of the disease, before it can be confirmed by isolation of the virus and, or, serology.  相似文献   

Coalescence of two immiscible liquid drops     

Torza S  Mason SG 《Science (New York, N.Y.)》1969,163(3869):813-814

When two immiscible liquid drops suspended in a third immiscible liquid are brought into contact, three equilibrium configurations which depend upon the spreading coefficients are possible. Experiments for a large number of systems, including three phase emulsions, confirm the theory and indicate the mechanisms of reaching equilibrium.  相似文献   

Windows on other minds     

Mason WA 《Science (New York, N.Y.)》1976,194(4268):930-931

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PORCINE MYCOTIC ABORTION CAUSED BY ASPERGILLUS FUMIGATUS     

R. W. Mason 《Australian veterinary journal》1971,47(1):18-19

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Enumeration of lymphocyte subpopulations in bronchoalveolar lavage of monkeys using an immunoenzymatic staining technique     

M J Mason  D E Bice 《Veterinary immunology and immunopathology》1986,13(4):347-355

Percentages of T-helper (OKT4), T-suppressor (OKTB), and B (B1) lymphocytes were determined in peripheral blood and bronchoalveolar lavage (BAL) from six cynomolgus monkeys using an alkaline phosphatase based immunoenzymatic staining technique. The percent of each lymphocyte subset in lung lavage fluids were 40 +/- 9%, 26 +/- 7% and 11 +/- 4% for OKT4, OKT8 and B1, respectively. This cell distribution is similar to that obtained from normal human BAL samples using fluorescence techniques to evaluate binding. Values for peripheral blood lymphocyte subsets were not statistically different from BAL. This immunoenzymatic technique avoids the necessity for cell separation procedures which are used to alleviate problems with alveolar macrophage autofluorescence that can be encountered in fluorescence based assays of BAL samples. This technique also can be used by laboratories interested in lymphocyte characterization, but not equipped for fluorescence microscopy or flow cytometry.  相似文献