Penetration of the placental barrier by streptomycin     

A V Golikov  A L Artemova  N S Lod'ianova 《Veterinariia》1969,46(7):75-76

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The thermal method of sterilizing soil infected by the causative agent of anthrax     

Sh Kh Kharisov  Kh Kh Abdullin  L N Ryzhov 《Veterinariia》1969,46(6):99-101

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Infectivity of Marek's disease agent after different treatments used in vaccine production     

Kottaridis SD  Luginbuhl RE  Fredrickson TN 《American journal of veterinary research》1969,30(10):1851-1855

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Toxic action of Granosan     

A N Ardatova  D D Poloz  O V Iakusheva 《Veterinariia》1969,46(1):56-58

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Light and hormones: interchangeability in the induction of nitrate reductase     

Lips SH  Roth-Bejerano N 《Science (New York, N.Y.)》1969,166(3901):109-110

Suitable concentrations of kinetin and gibberellic acid permit induction of nitrate reductase in leaves of tobacco in the dark. Hormone sprays eliminate the need for light induction of the enzyme. The concentration of gibberellic acid required for optimal induction varies according to the concentration of kinetin supplied.  相似文献   

The method of studying female sterility in laboratory animals     

N N Mikha?lov 《Veterinariia》1969,46(8):80-81

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An investigation on commercial farms of factors thought to contribute to egg cracking     

F. B. Leech  N. R. Knowles 《British poultry science》1969,10(2):139-147

An investigation of 52 egg production units showed that in battery units, but not under other systems of husbandry, the proportion of defective eggs produced by birds in their second year was more than twice that of the first year. The proportion of defective eggs was unrelated to the shell thickness (measured by the deformation test on random samples of sound eggs from the same flocks). Damage to eggs during collection and packing was trivial, relative to the proportions of defective eggs found in the nests or cages.  相似文献   

Purifying foot-and-mouth disease virus for electron microscopy     

V L Uziumov  A N Shevardin  M V Kotova  V A Perevozchikov 《Veterinariia》1969,46(1):23-25

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Lymphoproliferative diseases of fowl--high LDH levels associated with lymphoblastic leukemia (JM-V)     

N D Jones  A J Kenyon  C F Helmboldt  M Sevoian 《Avian diseases》1969,13(3):579-584

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The artificial production of translucent streaks on egg shells and various factors influencing their development     

C. Tyler  N. Standen 《British poultry science》1969,10(4):359-369

It is well known that translucent streaks can develop on egg shells due to damage to the surface of the shell. These “artifacts” have been produced under standard conditions and a study of them shows that the rate of development of the translucent areas up to their maximum brightness as measured by a scoring system can be expressed in simple mathematical terms. Having established this it was then possible to show that the rate of development of these translucent areas was (a) inversely related to the time of marking after the egg was laid, (b) directly proportional to external temperature and (c) affected by relative humidity so that a humidity between 10 and 30 per cent gave the maximum rate of development.

Replacing the egg content with water or alcohol gave some interesting results.

It was also found that the translucent streaks were weaker than corresponding opaque areas of the shell. The width of the streak produced under standard conditions varied greatly between the different eggs.

The reasons for these various findings are discussed.  相似文献