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THE GUT FLORA OF THE CHICK. II. THE ESTABLISHMENT OF THE FLORA 总被引:1,自引:1,他引:0
SUMMARY: Viable counts were made in three media of material from the crop, gizzard, duodenum, ileum and caeca of chicks. Groups of birds 2, 4, 7, 10, 13, 16 and 30 days old were studied. The results showed that a balanced gut flora is established one day after feeding. An indication of the actual development of the flora was obtained in chicks 4 hr after feeding. The relationship between the flora at different ages and that in newly-hatched chicks before feeding is discussed. 相似文献
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ZOFIA KIELAN-JAWOROWSKA LEV A. NESSOV 《Lethaia: An International Journal of Palaeontology and Stratigraphy》1990,23(1):1-10
A lower molar of Sulestes sp., a deltatheridiid from the Coniacian of Uzbekistan, is described. The Deltatheroididae new fam. is erected. The Deltatheroididae and Deltatheridiidae are assigned to the order Deltatheroida Kielan-Jaworowska 1982 and it is argued that the Deltatheroida are metatherians, a sister group of Marsupialia. The Deltatheroida have at least an incipient alisphenoid bulla, three premolars sharply differentiated morphologically from four molars, a very large stylar area and the protoconid higher than the metaconid. They differ from known Cretaceous marsupials in having a tendency to lose the last molar, in having a small protocone, a narrow and short talonid, and a hypoconulid and entoconid not approximated. Known deltatheroidan taxa are compared. Relationships of the Deltatheroida and Aegialodontia are discussed. The place of metatherian origin is still not known with certainty. □ Mammalia, Metatheria, Deltatheroida, Marsupialia, Cretaceous, Asia, Paleobiogeography. 相似文献
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LEV M 《Journal of bacteriology》1956,72(5):718-719
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M. LEV 《Journal of applied microbiology》1962,25(1):30-34
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THE GUT FLORA OF THE CHICK. I. THE FLORA OF NEWLY HATCHED CHICKS 总被引:1,自引:1,他引:0
SUMMARY: The presence of a caecal microflora has been demonstrated in newly hatched chicks that had not received food or water. The flora was composed mainly of clostridia, sometimes with Escherichia coli . 相似文献