testosterone is believed to play a significant role in spermatogenesis, but its contribution to the process of spermatogenesis is not completely understood. given that extracellular matrix (ecm) facilitates differentiation of spermatogonial stem cells (sscs) during culture, the present study was conducted to elucidate whether testosterone contribute to the permissive effect of ecm on sscs diffe...

the hosoya index and the merrifield-simmons index are two types of graph invariants used in mathematical chemistry. in this paper, we give some formulas for computed these indices for some classes of corona product and link of two graphs. furthermore, we obtain exact formulas of hosoya and merrifield-simmons indices for the set of bicyclic graphs, caterpillars and dual star.

performance of the fiber optic networks with different physical topologies such as point-to-point, bus, ring and star, with respect to requirements as bit rates, topology structure, bit. error rate (ber) and optical component characteristics including optical amplifiers, filters, sources and detectors, are analyzed and simulated. for this purpose, maximum number of supportable nodes and throug...

in this paper, we first present a new important property for bouligand tangent cone (contingent cone) of a star-shaped set. we then establish optimality conditions for pareto minima and proper ideal efficiencies in nonsmooth vector optimization problems by means of bouligand tangent cone of image set, where the objective is generalized cone convex set-valued map, in general real normed spaces.

introduction: microleakage is a major factor affecting the longevity of adhesive restorations. colored compomer is a new restorative material that was specifically designed for the restoration of primary molars in different colors, but their microleakage is unknown. this study was carried out to compare the microleakage of a colored compomer (twinky star) and a conventional compomer (f2000) wit...

‎in this paper we try to extend geometric concepts in the context of operator valued tensors‎. ‎to this end‎, ‎we aim to replace the field of scalars $ mathbb{r} $ by self-adjoint elements of a commutative $ c^star $-algebra‎, ‎and reach an appropriate generalization of geometrical concepts on manifolds‎. ‎first‎, ‎we put forward the concept of operator-valued tensors and extend semi-riemannian...

the price of oil plays an important role in the global economy and is an important factor influencing the government and commercial sectors. because of increasing importance of oil in financial markets, oil price predictions have always been an important subject for the researchers in economics, and other economic agents. this paper tries to study the behavior of crude oil prices based on smoot...

in order to select of the best nectarine cultivars in meshkinshahr environmental condition, 11 cultivars of nectarines (including: independence, star redgold, stark sunglow, sanking, quata, shabrang e karaj, germez-e-paeez-e-mashad and 4 new imported cultivars including: winberger, vega, orion and gioia) were grafted on misory peach rootstock. cultivars were planted in randomized complete block...

For a simplicial subdivison of a region in kn (k algebraically closed) and r ∈ N, there is a reflexive sheaf K on Pn, such that H 0(K(d)) is essentially the space of piecewise polynomial functions on , of degree at most d, which meet with order of smoothness r along common faces. In [9], Elencwajg and Forster give bounds for the vanishing of the higher cohomology of a bundle E on Pn in terms of...