Gas chromatographs equipped with electron capture detectors (ECD) are widely used for the analysis of electron affine substances. Achieving limits of detection in the low pptv-range, electron capture detectors are the most sensitive detectors available for such compounds. Based on their operating principle, they require free electrons at atmospheric pressure, which are usually generated by usin...

background: to reduce traffic injuries in the country, health professionals should have accurate estimates of road traffic deaths. multiple and sometimes inconsistent statistics presented by organizations in charge create high degree of uncertainty for planners and decision makers. to achieve an accurate estimate, several methods are available. of them, capture-recapture method seems to be an a...

antibody detection is the most versatile and commonly used method for measles diagnosis. detection of specific igm antibodies in a single serum specimen collected within the appropriate time after rash onset can provide a good presumptive diagnosis of current or recent measles infection and is the test of choice for rapid diagnosis of measles cases. so, optimal timing for collection of a single...

background: in neutron interaction with matter and reduction of neutron energy due to multiple scatterings to the thermal energy range, increasing the probability of thermal neutron capture by neutron captures makes dose enhancement in the tumors loaded with these materials.   objective: the purpose of this study is to evaluate dose distribution in the presence of  10 b ,  157 gd  and  33 s  ne...

We compared the transcription regulatory interactions inferred from three high-throughput methods. Because these methods use different principles, they have few interactions in common, suggesting they capture distinct facets of the transcription regulatory program. We show that these methods uncover disparate biological phenomena: long-range interactions between telomeres and transcription fact...

The paper presents an integrated approach to building evolving artificial intelligent systems in terms of evolving connectionist systems (ECOS) that capture principles from neural networks, gene interaction networks and evolutionary systems. The ECOS can be used to solve complex problems from computational biology that is illustrated on a simplified gene regulatory network modeling problem. The...

helicobacter pylori (h. pylori) is a gram-negative bacterium that colonizes the human stomach and affects more than half of the global human population. this microorganism shows variations in its geographical distribution and causes chronic gastritis, peptic ulcer, gastric adenocarcinoma and mucosa-associated lymphoid tissue lymphoma. the development of these clinical entities depends on the ba...

soluble forms of nonclassical human leukocyte antigen (hla)-g have recently been suggested as immunomodulatory factors in multiple sclerosis (ms). hla-g inhibits the effecter function of t cells and natural killer (nk) cells. also regulatory t cells (treg) are considered as pivotal players in ms pathogenesis. thus, we aimed to evaluate the presence of hla-g molecules and treg cells in relapsing...

In hindsight, the year 1990 was a crossroads in environmental and regulatory policy generally and in the regulation of food specifically. And two different narratives capture the competing regulatory choices presented at that crossroads. The first, a conventional narrative, finds mounting evidence of what many regard as the dominant avenues of regulatory reform in environmental policymaking: ma...

Regulation of gene expression in eukaryotes involves many complex processes, in which chromatin structure plays an important role. In addition to the epigenetic effects, such as DNA methylation and phosphorylation or histone modifications, gene expression is also controlled by the spatial organization of chromatin. For example, distant regulatory elements (enhancers, insulators) may come into d...