background: chromosomal alterations play an important role in carcinogenesis. enhanced chromosomal radiosensitivity is shown for many cancer predisposition conditions including breast cancer. in this study chromosomal radiosensitivity and the frequency of background sister chromnatid exchanges (sce) in lymphocytes of normal individuals and breast cancer patients was compared. materials and meth...

Scattering of the forward-shock synchrotron emission by a relativistic outflow located behind the leading blast-wave may produce an X-ray emission brighter than that coming directly from the forward-shock and may explain four features displayed by Swift X-ray afterglows: flares, plateaus (slow decays), chromatic light-curve breaks, and fast post-plateau decays. For a cold scattering outflow, th...

  Bimorph piezoelectric cantilevered (BPC) actuators have recently received a great deal of attention in a variety of micro-electromechanical systems (MEMS) applications. Dynamic modeling of such actuators needs to be improved in order to enhance the control performance. Previous works have usually taken transv...

In this paper we investigate the extremal relationship between two well-studied graph parameters: order of largest homogeneous set in a G and maximal number distinct degrees appearing an induced subgraph G, denoted respectively by hom⁡(G) f(G). Our main theorem improves estimates due to several earlier researchers shows that if is n-vertex with hom⁡(G)≥n1/2 then f(G)≥(n/hom⁡(G))1−o(1). The boun...

We study the computational power of machines that specify their own acceptance types, and show that they accept exactly the languages that ≤ m -reduce to NP sets. A natural variant accepts exactly the languages that ≤ m -reduce to P sets. We show that these two classes coincide if and only if P = P, where the latter class denotes the sets acceptable via at most one question to #P followed by at...

OBJECTIVE To analyze the compliance with occupational post-exposure protocol for accidents and factors associated with compliance among dental surgeons. METHODS A cross-sectional study was performed in the municipality of Montes Claros, Southeastern Brazil, from 2007 to 2008, with accident reports from needles and sharp instruments among practicing dental surgeons. Variables describing the de...

Objective: In this paper, we have introduced topoisomerase inhibitors, mechanism of action and types of them. DNA topoisomerases are ubiquitous enzymes that catalyze essential enzymes to solve the topological problems accompanying key nuclear processes such as DNA replication, transcription, repair and chromatin assembly by introducing temporary single or double strand breaks in the DNA. Result...