objective(s):  the cholinergic system plays an important role in learning and memory. this study investigated the effects of curcumin (turmeric extract) and the cholinergic system and their interaction on memory retention of passive avoidance learning in adult male wistar rats. materials and methods: at first, an injection cannula was implanted in right ventricles of the animals. one week after...

conclusions the results revealed that the novel multi-epitope dna construct could be an effective candidate in tuberculosis vaccine development, and it is qualified to investigate its potential to induce cd4 and cd8 t- cell immune response in the experimental animal model. results mhc class i-and class ii-predicted epitopes showed a high potential to binding to human hlas alleles, with global b...

background: h-reflex is a valuable electrophysiological technique for assessing nerve conduction through entire length of afferent and efferent pathways, especially nerve roots and proximal segments of peripheral nerves. the aim of this study was to investigate the relation between normal values of flexor carpi radialis (fcr) h-reflex latency, upper limb length and age in normal subjects, and t...

normal 0 false false false en-us x-none ar-sa background: the h-reflex is a useful electrophysiological procedure for evaluating the status of the peripheral nervous system, especially at the proximal segment of the peripheral nerve. the purpose of this study is to investigate the relation between triceps surae h-reflex and m- response latencies and thigh length in normal population, in order t...

In this paper we model the hierarchal nature of memory in order to examine the variance, and in general, all moments of the distribution of time memory access. The existence of an unbounded variance for the memory access time can lead to extremely long wait queues and a particular class of distributions that has this property is the power tailed distribution. We present an analytical model to s...

background and aim: auditory p300 is an event-related potential. cognitive factors like attention are involved in the generation of p300. it seems that normative variation of p300 is necessary for clinical purposes. thus, the current study was designed to establish preliminary normative variation of p300 amplitude and latency at fz and cz sites in adults. methods: this cross-sectional study was...

background: h-reflex is a valuable electrophysiological technique for assessing nerve conduction through entire length of afferent and efferent pathways, especially nerve roots and proximal segments of peripheral nerves. the aim of this study was to investigate the relation between normal values of flexor carpi radialis (fcr) h-reflex latency, upper limb length and age in normal subjects, and t...

background:  optical coherence tomography (oct) is a non-invasive instrument, which can be used to estimate the thickness of the retinal nerve fibre layer (rnfl) and provides an indirect measurement of axonal destruction in multiple sclerosis (ms). the main aim of this study was to find out any correlations between p100 latency in visual evoked potential (vep) and rnfl thickness. methods: the p...

In this paper we review the traversal algorithms for kd-trees for ray tracing. Ordinary traversal algorithms such as sequential, recursive, and those with neighbor-links have different limitations, which led to several new developments within the last decade. We describe algorithms exploiting ray coherence and algorithms designed with specific hardware architecture limitations such as memory la...