A new human allotype carried by the γG3 subclass: Gm(25)
SummaryThe Gm(25) allotype has been tested on sera from various populations. It is closely related to Gm(5), Gm(10), Gm(11), and Gm(14) in Caucasoids, and to Gm(10) and Gm(11) in Mongoloids, but it distinguishes itself in Negroids where the Gm(5, 10, 11, 14,-25) phenotype is present with a frequency depending on the regions studied. It was demonstrated to be carried by the Fc fragment of γG2 Gm(5, 10, 11, 14). In a Caucasoid family it was possible to demonstrate the transmission of a rare gene, Gm1,10,11,17, 25. Among Old World Monkeys Gm(25) is present in Baboons and absent in Cercopitheci.RésuméL'allotype Gm(25) a été étudié sur des sérums de populations variées. Il est lié aux Gm(5), Gm(10), Gm(11) et Gm(14) chez les Blancs, aux Gm(10) et Gm(11) chez les Jaunes, mais il s'en distingue chez les Noirs où se retrouve le phénotype Gm(5,10,11,14,-25) avec une fréquence variable selon les régions. Il est présent sur le fragment Fc des γG3 Gm(5,10,11, 14). Dans une famille Caucasoide nous démontrons la transmission du rare gène Gm1,10,11,17,25. L'étude sur des Singes de l'Ancien Monde démontre que le Gm(25) est présent chez les Babouins et absent chez les Cercopithèques.
Gm(f)—a Determinant of Human γ‐Globulin
1 Trois sérums qui, apparemment, se comportaient comme un anti‐Gm(b) lorsqu'on les utilisaient pour déterminer des sérums en nombre limité de personnes de race caucasienne, ont été à même d'agglutiner des erythrocytes revêtus d'anticorps anti‐Rhésus qui ne sensibilisaient pas les erythrocytes à l'anti‐Gm(b). Nous proposons d'appeler la spécificité de ces sérums anti‐Gm(f). 2 Le type Gm(b+f‐) est commun dans la race noire. Les caucasiens étudiés sont, à de rares exceptions près, Gm(b+f+) ou Gm(b‐f‐).
Investigations on the rôle of organic matter in plant nutrition
1. As the result of decomposition of green manure in a swamp soil, the coarse fractions (including coarse and fine sand) of the surface layer (first 3 inches) decreased by 11·2 per cent. while the fine ones (silt+clay) increased by 9·8 per cent. in the course of 43 days. The effect was less pronounced in the manured soil maintained at 60 per cent. saturation, while no alteration was to be noticed in the case of the unmanured specimens. 2. Treatment with dilute hydrochloric acid prior to dispersion had no appreciable effect on the estimates of mechanical composition obtained in the different cases. Loss in solution was also comparatively small. 3. The silica-sesquioxide ratio increased slightly as the result of decomposition of green manure in swamp soil. The composition of the fine fractions was also altered, the total percentages of the oxides of iron, aluminium and silicon increasing from 90·5 to 99·3 in the course of 71 days. 4. The practical significance of the above and related observations has been discussed.