4,194 research outputs found
Inheritance of resistance to Kabatielle eyespot of maize
Des études génétiques portant sur la résistance du maïs-grain (Zea mays) aux attaques de la kabatiellose causée par le Kabatiella zeae ont consisté en des essais de croisements diallèles 8x8. Chez les huit lignées utilisées, l'action additive des gènes semble avoir été déterminante quant à la résistance aux attaques du feuillage. Il y a eu un certain degré de dominance chez quatre groupes de gènes. L'hérédité au sens strict a été évaluée à 75%. La lignée V312 a été la plus résistante à la maladie tandis que les lignées F522, WF9 et L2039 sont apparues sensibles.Genetic studies of resistance to Kabatiella zeae causing eyespot in grain maize (Zea mays) were conducted using an 8 x 8 complete diallel cross. In the eight inbreds used, the additive component appeared to be the most important in determining resistance to eyespot. There appeared to be at least four genes showing some degree of dominance. Narrow-sense heritability was estimated at 75%. Inbred V312 was the most resistant line among the eight lines in this diallel set, whereas F522, WF9 and L2039 appeared to be susceptible
Experimental status of the isoscalar S wave at low energy: pole and scattering length
The experimental results obtained in the last few years on kaon decays
(K and, above all, Ke4 decays) allow a reliable, model independent
determination of low energy scattering in the S0 wave. Using them and,
eventually, other sets of data, it is possible to give a precise
parametrization of the S0 wave as well as to find the scattering length and
effective range parameter. One can also perform an extrapolation to the pole of
the " resonance" []. We obtain the results
and, for the pole, M_\sigma=484\pm17 \mev,\quad\gammav_\sigma/2=
255\pm10 {\rm MeV}.Comment: Plain TeX;4 figures; improved data used; version to appear in Phys.
Rev.
Image transfer through a chaotic channel by intensity correlations
The three-wave mixing processes in a second-order nonlinear medium can be
used for imaging protocols, in which an object field is injected into the
nonlinear medium together with a reference field and an image field is
generated. When the reference field is chaotic, the image field is also chaotic
and does not carry any information about the object. We show that a clear image
of the object be extracted from the chaotic image field by measuring the
spatial intensity correlations between this field and one Fourier component of
the reference. We experimentally verify this imaging protocol in the case of
frequency downconversion.Comment: 17 pages, 7 figure
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