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1933; Nature Portfolio; Volume: 132; Issue: 3336 Linguagem: Inglês
10.1038/132580a0
ISSN1476-4687
Resumodark matter of our galaxy may be greater in total mass than that which is luminous.FRANK H. SMITH : Preliminary studies of chromosome rings in Brodiaea lactea.21-24 pairs of chromosomes are present and ring or chain associations of four small, four large or six chromosomes have been observed.CLYDE E. KEELER: Absence of the corpus callosum as a Mendelising character in the house mouse.The investigation is laborious because diagnosis of the condition necessitates sacrificing the animal, but none of the matings gives results which suggest other than that the character is a single MendAlian recessive, apparently not detrimental to the individual.P. A. SMITH : The topology of involutions.EDWIN H. HALL : On supraconductivity and the Hall effect.Experimental work at low temperature suggests that, in supraconducting lead, there is very l1ttle or no tendency for an electric current to move sideways through the metal (Hall effect).The validity of the work is questioned on the grounds that it assumes full penetration of a supraconducting metal by a magnetic flux-which is regarded as unlikely-and that the current observed in a supraconducting metal may be an aggregate of microscopic electric whirls within the metal and not a circumferential persistent current.GEORGE W. PucHER and HuBERT BRAD• FORD VICKERY : The katabolism of the non-volatile organic acids of tobacco leaves during curing.Large losses (up to 100 per cent) of oxalic acid occur during dehydration with alcohol and usual modes of esterification; it should be extracted with ether.Oxalic, malic and monobasic acid content of leaves are little changed by curing ; citric acid increases enormously and polybasic acids decrease very rapidly.HENRY BoRSOOK and GEOFFREY KEIGHI,EY : The energy of urea synthesis.Using a modification of the W arburg technique, increased oxygen consumption accompanied synthesis of urea from ammonium bicarbonate in Ringer's solution.GREGORY PINCUS and PRISCILLA WHITE : On the inheritance of diabetes mellitus.Treating the limited data available statistically and making certain assumptions, they give results in fair agreement with the supposition that the capacity for developing diabetes is inherited as a Mendelian recessive.A. E. NAVEZ: Growth-promoting substance and illumination.Apical parts of Lupinis albus seedlings grown in the light appears to give twice as much growth-promoting substance (auxin) as seedlings grown in the dark.T. CUNLIFFE BARNES and T. L. J AHN : The effect of ice and steam water on Euglena.The average increase in this organism in 10-16 days was 32 per cent in condensed steam water and 105 per cent in ice water.
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