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In this paper, which is an extension of a very recent one, we show, in a first part, that starting from RNA, pore exactly, from the detailed atomic composition of its basic components, the four ribonucleotides UMP, CMP, AMP and GMP, full of Fibonacci numbers, we can derive the "One-Number Model" of the genetic code which was introduced by us some years ago, in 2007. In a second and original part, we consider the opposite way, that is, starting from the "One-Number Model", we can recover, in the detail, the atomic composition of the four ribonucleotides, from which we started, and the "circle is complete".

 
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In this short paper, we present an interesting and welcome connection between two different approaches to the mathematical structure of the standard genetic code, we have considered in the last years. The first one relies on the use of the unique number 23! and the second is based on the atomic composition of the four ribonucleotides UMP, CMP, AMP and GMP, the building-blocks of RNA, where several Fibonacci numbers are seen to occur.

[ Modifié: vendredi 29 mai 2020, 22:48 ]
 
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محاضرات مقياس مخبر السمعي البصري  ماستر السداسي الثاني تخصص سمعي بصري   الدكتور بن دريس أحمد

عزيزي الطالب تجد في الملف المدرج أسفله ملخص عن محاضرات المقياس إضافة للمحاضرات التي قمنا بتقديمها قبل الحجر

وفقك الله 

 
par SALIH HACINI, lundi 11 mai 2020, 14:10
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TD  Halogénation

 
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Chapitre III  Halogénation

Partie III

 
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Chapitre III  Halogénation

Partie I

 
par kheira BOUSMAHA, samedi 9 mai 2020, 22:25
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exercices sur la récursivité

 
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corrigé détaillé de l'exo1 et l'exo2 de la fiche sur la récursivité

 
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Abstract
Feynman–Hibbs corrections in molecular dynamics computer calculations of solid C60 are implemented within the classical effective pair potential approach. The potential model chosen for the site–site interactions is of the Buckingham exp-6 type (Rigby 1986 The Forces Between Molecules (New York: Oxford University Press)), fitted to the Cheng and Klein or the Kitaïgorodsky potential. Structural and thermodynamic properties of the C60 crystal lattice are investigated over a wide range of pressures and temperatures, and data obtained are compared to experimental results and those obtained from a classical approach (Baameur et al 2000 Phys. Status Solidi 220 821). It will be demonstrated that 'quantum corrections' applied in a simple quasi-classical simulations have a great influence upon most calculated properties and increase their accuracy when compared to classical approaches. The observed transition pressure with the distorted lattice and cell contraction compares favourably well with experimental data and equation of state calculations. All measured properties are reported together with the phonon density of states at different pressures.