CRYPTOSPORIDIUM IN A RED-BELLIED BLACK SNAKE (PSEUDECHIS PORPHYRIACUS)     

R. A. McKENZIE  P. E. GREEN  W. J. HARTLEY  C. C. POLLITT 《Australian veterinary journal》1978,54(7):365-366

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Electron microscopic study of spermatozoa     

WU SH  McKENZIE FF 《Science (New York, N.Y.)》1954,119(3085):212-213

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Volatiles from the 1994 Eruptions of Rabaul: Understanding Large Caldera Systems     

K Roggensack  SN Williams  SJ Schaefer  RA Parnell 《Science (New York, N.Y.)》1996,273(5274):490-493

The 1994 eruption of Rabaul, in Papua New Guinea, involved a small plinian eruption at Vulcan and a vulcanian eruption on the opposite side of the caldera at Tavurvur. Vulcan's ash leachates indicate seawater interaction that is consistent with earlier observations of low sulfur dioxide emissions and the presence of ice crystals in the initial plinian eruption cloud. In contrast, Tavurvur ash leachates indicate no seawater interaction, and later sulfur dioxide emissions remained high despite low-level eruptive activity. Silicic melt inclusions indicate that the andesitic melt contained about 2 weight percent water and negligible carbon dioxide. Mafic melt inclusions in Tavurvur ash have water and carbon dioxide contents that vary systematically over the course of the eruption. The mafic melt inclusions suggest that a mafic dike intruded from below the silicic chamber and provide further evidence that mafic intrusions drive caldera unrest.  相似文献   

X-cell gill disease obliterates the lamellar blood supply in the Antarctic teleost, Pagothenia borchgreviniki (Boulenger 1902)     

C. E. FRANKLIN  J. C. McKENZIE  W. DAVISON  P. W. CAREY 《Journal of fish diseases》1993,16(3):249-254

Abstract Vascular corrosion casting methods were used to elucidate the pathological effects of X-cell disease on the blood supply to the gills of the Antarctic teleost, Pagothenia borchgrevinki (Boulenger, 1902). Afferent and efferent branchial arteries were patent in X-cell diseased fish; however, the blood supply to the lamellae was markedly reduced or obliterated in areas in which there was a predominance of X-cells. The present authors believe that the tissue hyperplasia associated with X-cell disease results in the compression of the lamellar vascular bed which leads eventually to the occlusion of vessels.  相似文献   

Adrenal teratoma in an ox     

PW LADDS  P. RUSSELL†  RA FOSTER 《Australian veterinary journal》1990,67(12):464-465

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BOOK REVIEW     

RA Read 《Australian veterinary journal》1990,67(11):424-424

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Pimelea neo-anglica poisoning of cattle     

G J STORIE  R A McKENZIE  J L NORMAN † 《Australian veterinary journal》1986,63(8):235-235

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Influence of alternative treatment strategies on the output of strongyle eggs in the faeces of horses     

ER HUNT  RA WOODWARD  CG MORRISON 《Australian veterinary journal》1996,74(2):159-161

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AN ABATTOIR SURVEY OF BOVINE URINARY BLADDER PATHOLOGY   总被引：1，自引：0，他引：1  

R. A. McKENZIE 《Australian veterinary journal》1978,54(1):41-41

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Chronic cervical compressive myelopathy in horses: clinical correlations with spinal cord alterations     

JV YOVICH  RA LeCOUTEUR†  DH GOULD† 《Australian veterinary journal》1991,68(10):326-334

Histological examination was performed on the cervical spinal cord from 13 horses with chronic cervical compressive myelopathy of 4 to 29 months duration. Structural alterations were correlated with clinical features. At the level of compression, the spinal cord was grossly deformed. Histological alterations included nerve fibre swelling and degeneration, occasional spheroids, astrocytic gliosis, increased macrophage activity and increased perivascular collagen. Myelin degeneration or loss at the level of the compressive lesion was greatest in the ventral and lateral funiculi and less consistently present in the dorsal funiculi. Asymmetry of lesions in the dorsal funiculi was associated with asymmetry of clinical signs in 5 horses. Histological alterations in areas of Wallerian degeneration were similar to that at the level of spinal cord compression, except that perivascular collagen was not increased. Wallerian degeneration was present cranial to the compressed site in the superficial portions of the lateral funiculi and in the middle of the dorsal funiculi. Caudal to the compressed site it was present in the ventral funiculi adjacent to the ventral median fissure and in the middle of the lateral funiculi. Deformation of the spinal cord did not correlate with the severity or duration of clinical signs but was positively correlated with the amount of perivascular collagen increase. The amount of nerve fibre swelling was not correlated with the severity of clinical signs but was negatively correlated with their duration. A rapid loss of nerve fibres apparently occurred early in the course of compression, since there was a marked decrease in the amount of nerve fibre swelling and Marchi stained degenerating myelin with increasing clinical duration.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献