Cette thèse est consacrée à l’étude de divers problèmes de modélisation en élasticité non linéaire. Les deux premières parties portent sur la justification des modèles bidimensionnels de plaques non linéaires. La motivation est commune, mais les approches, développement asymptotique formel dans un cas, Γ-convergence dans l’autre diffèrent. Le dernier chapitre traite de la modélisation des solid...

In 1994, Dobrynin and Kochetova introduced the concept of degree distance DD(Γ) a connected graph Γ. Let dΓ(S) be Steiner k-distance S⊆V(Γ). The Wiener k-index or k-center indexSWk(Γ) Γ is defined by SWk(Γ)=∑|S|=kS⊆V(Γ)dΓ(S). distanceSDDk(Γ) SDDk(Γ)=∑|S|=kS⊆V(Γ)∑v∈SdegΓ(v)dΓ(S), where degΓ(v) vertex v in this paper, we consider Nordhaus–Gaddum-type results for SWk(Γ) SDDk(Γ). Upper bounds on SW...

background: cytotoxic therapy can lead to prolonged azoospermia or even sterility. in the present study, we investigated the morphological changes of mouse testes after gamma-radiation. methods: after anaesthetizing of nmri mice, testes and their surrounding tissues were irradiated using a cobalt therapy machine. four experimental groups were irradiated with fractionated doses of: 1.5+8, 1.5+12...

Let R be a commutative ring with identity and M an R-module. In this paper, we associate a graph to M, sayΓ(RM), such that when M=R, Γ(RM) coincide with the zero-divisor graph of R. Many well-known results by D.F. Anderson and P.S. Livingston have been generalized for Γ(RM). We Will show that Γ(RM) is connected withdiam Γ(RM)≤ 3 and if Γ(RM) contains a cycle, then Γ(RM)≤4. We will also show tha...

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secreted cytokines of th1 (t-helper)/th2 cells play an important role in the pathogenesis of many diseases. th1 cells secrete predominantly ifn-γ and il-2 which regulate cell-mediated immunity against intracellular pathogens and tumors. in this study, expression of ifn-γ was studied using semiquantitative rt-pcr. in brief, lymphocytes of a healthy donor were stimulated with pha (1μg/106 cell/ml...

background: microtubules (mt) are important components of cell cytoskeleton and play key roles in cell motility mitosis and meiosis. they are also the targets of several anticancer agents which indicating their importance in maintaining cell viability. microtubular reorganization contributing to apoptotic morphology occurs in normal and neoplastic cells undergoing apoptosis induced by cytotoxic...