منابع مشابه
Genetics: Nelson and Lederberg
* Th(e work reporte(I in this article( was carried( out und(ler Contract No. AT-(30-1)-1151, United St at4s Atomiic Energy Conimnissioi. S. Wright and Th. Dohzhansky, Genetics, 31, 125-156, 1946. 2 E. Spiess, Evolution, 4, 14-33, 1950. 3 A. B. Da Cunha, Evolution, 5, 395-404, 1951. 4Th. Dobzhansky and 0. Pavlovsky, Evolution, 7, 198-210, 1953. 5 H. Levene, 0. Pavlovsky, and Th. Dobzhansky, Evol...
متن کاملCharacterisations of Nelson Algebras
Nelson algebras arise naturally in algebraic logic as the algebraic models of Nelson’s constructive logic with strong negation. This note gives two characterisations of the variety of Nelson algebras up to term equivalence, together with a characterisation of the finite Nelson algebras up to polynomial equivalence. The results answer a question of Blok and Pigozzi and clarify some earlier work ...
متن کاملNelson–Aalen Estimator
The Nelson–Aalen estimator is a nonparametric estimator which may be used to estimate the cumulative hazard rate function from censored survival data (see Survival Distributions and Their Characteristics). Since no distributional assumptions are needed, one important use of the estimator is to check graphically the fit of parametric models, and this is the reason why it was originally introduce...
متن کاملRelics of the Antarctic tundra
Many viruses have capsids that are icosahedra: 20-sided nearspheres with triangular faces. Chuan Zhang et al. have created icosahedra consisting purely of DNA, which self-assemble from five-pointed molecular tiles. The authors’ previous research with three-pointed tiles showed that triangular faces make extremely stable building blocks. In the present work, they designed fivepointed tiles using...
متن کاملRelics of Double Radio Sources
We have formed a new sample which consists of extended extragalactic radio sources without obvious active galactic nuclei (AGN) in them. Most of these sources appear to be dead double radio sources. These sources with steep spectra (α < -1.8; S ∝ ν) were identified using the 74 (VLSS) and the 1400 MHz (NVSS) surveys and further imaged using the Very Large Array (VLA) and the Giant Meterwave Rad...
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ژورنال
عنوان ژورنال: Royal United Services Institution. Journal
سال: 1901
ISSN: 0035-9289
DOI: 10.1080/03071840109424896