Fossil grass anthoecia within miocene rhinoceros skeletons: diet in an extinct species     

Voorhies MR  Thomasson JR 《Science (New York, N.Y.)》1979,206(4416):331-333

Silicified anthoecia (fertile le'mmas and paleas) of grasses (Berriochloa communis, Berriochloa primaeva, and Berriohldoa cf. nova) were found in, the oral cavity and rib cage articulated skeletons of Teleoceras major buried in late Clarendonian volcanic ash in. Nebraska The plant fossils, thought to be food residues, help clarify, the enigmatic paleobiological role, of Teleocears, which had hippotamus-like porportions but very high-crowned teeth. Telecoceras was probably amphbious, but siliceous grasses formed a significant portion of its diet.  相似文献   

Igneous systems     

Wones DR 《Science (New York, N.Y.)》1979,206(4416):329

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Cell-mediated immune responses of neonatal calves and adult cattle following inoculation with PPD of Mycobacterium bovis associated with a mycobacterial immunopotentiating glycolipid and oil droplets.     

L F Woodard  H W Renshaw  D Burger  C S McCain  R B Wilson 《American journal of veterinary research》1979,40(5):636-644

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Endotoxin absorption in hay-fed and lactic acidotic sheep.     

T L Huber  M C Peed  R C Wilson  D D Goetsch 《American journal of veterinary research》1979,40(6):792-794

Absorption of endotoxin from the gastrointestinal tract was evaluated in hay-fed and lactic acidotic sheep duodenally infused with 10 mg of Escherichia coli endotoxin, and in lactic acidotic sheep not infused. The effect of abomasal fluid on biological activity of endotoxin was also evaluated. Leukopenia was the criterion used for detecting endotoxemia. Absorption of endotoxin from the gastrointestinal tract was not detected in either hay-fed or lactic acidotic sheep. Endotoxin appeared to maintain its activity after incubation with abomasal fluid, and the presence of endogenous endotoxin in abomasal contents was indicated. The results indicate that endotoxin of alimentary origin may not be involved in the lactic acidosis syndrome in ruminants.  相似文献   

Isoenzyme variation in piroplasms isolated from bovine blood infected with Theileria annulata and T parva.     

T R Melrose  C G Brown 《Research in veterinary science》1979,27(3):379-381

Blood from calves infected with Theileria annulata and T parva was freed from host cell elements and the piroplasms liberated from the red cells by ammonium chloride lysis. Lysates of the purified piroplasms and control host cell material were examined electrophoretically for several enzymes. Zymograms stained for glucose phosphate isomerase showed distinct differences between the host cell enzyme pattern and parasite enzyme patterns. The isoenzyme pattern of T annulata piroplasms differed from the isoenzyme pattern of T parva piroplasms.  相似文献   

A simple technique to differentiate between animals infected with Yersinia enterocolitica IX and those infected with Brucella abortus.     

K R Mittal  I R Tizard 《Research in veterinary science》1979,26(2):248-250

While both Brucella abortus and Yersinia enterocolitica IX have O antigens in common, they differ significantly with respect to motility. Thus Br abortus is always non-motile while Y enterocolitica is motile when grown at room temperature. The presence of yersinia H agglutinins in serum can be shown to be evidence of previous exposure to Y enterocolitica. These agglutinins are not generated by brucella infection. A rapid H agglutination test will serve to provide this differentiation without interference from cross-reacting O antigens.  相似文献   

The susceptibility of chicken kidney and oviduct organ cultures to a vaccine strain of avian infectious bronchitis virus.     

R W Peters  J H Darbyshire  J K Cook 《Research in veterinary science》1979,26(1):38-40

The minimal infectious dose of the H52 strain of infectious bronchitis virus for organ cultures of oviduct and kidney was compared in chickens of different ages. Organ cultures of oviduct were found to be highly susceptible to infection regardless of the age of chicken and no difference in susceptibility could be demonstrated between cultures of the magnum and uterus regions of the mature oviduct. Kidney organ cultures were less susceptible and resistance to infection increased significantly (P less than 0.001) with the age of the chicken from which cultures were prepared.  相似文献   

Reserves of efficiency and quality]     

V S Krivonosov  A M Kravets  R R E?mats 《Veterinariia》1979,(8):17-20

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Serological study on the occurrence of bovine leukosis in Switzerland]     

F Steck  H Kupferschmied  W Leemann  R Kaderli  W Bommeli  P Gafner  H K Sp?rri 《Schweizer Archiv für Tierheilkunde》1979,121(9):439-450

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Virus seeks its disease: a seroepizootiological study of the presence of bovine herpes mammillitis in Switzerland]     

M Engels  A Metzler  R Wyler 《Schweizer Archiv für Tierheilkunde》1979,121(11):565-576

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