Development of amenenic leaf in tobacco

Coefficient de conversion interne du rayonnement de 92 keV du 234Pa

“…1) est tirée l'équation (1) donnant 03B2L1 en fonction du nombre de photons XL, 63 keV, 92 keV émis dans l'angle solide utilisé et-déduits de l'analyse du spectre (fig. 2) aL(29), a(29), «L(63), oc(63) sont les coefficients de conversion L et L + M -f-... des rayonnements électriques de 29 et 63 keV [4], [5], [6], [7] : 03C9 (Ml), W (El) sont les coefficients de fluorescence ,globaux des couches L excités par conversion interne M1 et El. Il faudra évidemment déduire du spectre figure 2, les photons XL, Xk, Compton, de freinage, de la transition UX,-234U.…”

“…Valeurs de ocL ; W utilisées. -Pour ocL(29), les valeurs 10 ou 11 ont été proposées [4], [6]. Nous avons remesuré ce coefficient en effectuant les coïncidences 63-29 keV, 63-X, nous trouvons ocL N 60.…”

Trashy Leaf in Australian-Grown Flue-Cured Tobacco: the Light Factor in the Development of Amenenic Leaf

“…The effects of the three treatments on the relative contents of labile hexose carbohydrate and total nitrogen as affected by leaf position are shown by the curves in Figure 1. The ratios of these quantities are also presented as curing coefficients (Johanson 1954b, and see below). The leaf from L rows has significantly more carbohydrate (average 38 per cent.)…”

“…With cigarette tobacco it is essential that harvested lea:f should have the correct composition if it is satisfactorily to undergo flue-curing. Deficiency of labile hexose carbohydrates relative to nitrogen fractions characterizes amenenic leaf (Johanson 1954b); this leafis succulent, it has less dry matter per unit area than the corresponding non-amenenic leaf, and it is unsuitable for curing. When cured, amenenic leaf loses yellow pigments, has low capacity for moisture, and becomes brown, brittle, and trashy (Johanson 1951).…”