Editorial v. 12, n. 27, maio/agosto 2010

Editorial CAFVIR 2010

Zhao 27/12

To determine how estrogens are involved in the growth of endometrial cancer with varying degrees of differentiation, we investigated the status of p72, a novel specific coactivator for estrogen receptor α (ERα) activation function-1 (AF-1), AIB1, a steroid receptor coactivator amplified in breast cancer 1, erbB-2, a receptor tyrosine kinase, and ERα in endometrial cancer. Gene expression of ERα...

He 27/12

Interleukin-15 (IL-15) is a pleiotropic cytokine that plays a key role in the regulation of both innate and adaptive immune responses. It promotes the survival, proliferation, activation and maintenance of natural killer and CD8+ T cells. It also stimulates the function of neutrophils, macrophages and dendritic cells, and could therefore be a potential cytokine for cancer immune therapy. The th...

# A 27 INTEGERS 10 ( 2010 ) , 319 - 334 THE DIVISIBILITY OF a n − b n BY POWERS

For given integers a, b and j ≥ 1 we determine the set R a,b of integers n for which an − bn is divisible by nj . For j = 1, 2, this set is usually infinite; we determine explicitly the exceptional cases for which a, b the set R a,b (j = 1, 2) is finite. For j = 2, we use Zsigmondy’s Theorem for this. For j ≥ 3 and gcd(a, b) = 1, R a,b is probably always finite; this seems difficult to prove, h...

$n$-cocoherent rings‎, ‎$n$-cosemihereditary rings and $n$-V-rings

 Let $R$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎A right $R$-module $M$ is called $(n‎, ‎d)$-projective if $Ext^{d+1}_R(M‎, ‎A)=0$ for every $n$-copresented right $R$-module $A$‎. ‎$R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $R$-module is $(n‎, ‎d)$-projective‎. ‎$R$...