Iris recognition has received increasing attentions due to its distinct characteristics in recent years. An efficient approach for iris feature extraction plays a very important role in an iris recognition system. In this paper, we developed a novel method for iris feature extraction utilizing the Intersecting Cortical Model (ICM) network which is a simplified model of Pulse-Coupled Neural Netw...

Iris masks are essential in iris recognition. The purpose of having a good iris mask is to indicate which part of iris texture map is useful and which part is occluded or contains noisy artifacts such as eyelashes, eyelids and specular re ections. The accuracy of the iris mask is extremely important. The performance of the iris recognition system will decrease dramatically when iris mask is ina...

BACKGROUND AND AIM Glutamine is an important energy source for the intestinal epithelium, and its supplementation protects intestinal epithelial cells by induction of glutathione. However, mechanisms of glutathione induction in cells at various stages of differentiation along the crypt to villus axis are not well understood. This study examined induction of glutathione in response to glutamine ...

BACKGROUND & AIMS The surface epithelium of the colon is being replaced constantly with cells derived from the stem cells of the crypt. Although the location of the stem cells is known, there are no markers for these cells. This study tested the hypothesis that colonic stem cells might be isolated and cultured on the basis of specific integrin expression patterns in normal human colonic epithel...

In this study, we examined the olfactory epithelium (OE) of the barfin flounder by transmission electron microscopy. As in the case of the ordinary teleost, the OE of the barfin flounder had 3 types of olfactory receptor cells (ciliated olfactory receptor cell, microvillous olfactory receptor cell and crypt cell), 3 types of supporting cells (ciliated, microvillous and crypt supporting cells) a...

Mucosal blood supply in the rat small intestine was studied by the injection replica scanning electron microscope method. The blood vascular plexus in the villus is originated at the tip of the villus and confluenced near the base of the villus. This supports the classical "fountain pattern" of MALL in the villous microcirculation. The capillary plexus in the crypt is derived at the base of the...

Intestinal stem cells (ISCs) are a group of rare cells located in the intestinal crypts which are responsible for the maintenance of the intestinal homeostasis and intestinal regeneration following injury or inflammation. Lineage tracing experiments in mice have proven that ISCs can repopulate the entire intestinal crypt. It is noteworthy that in such experiments, only a subset of intestinal cr...

The fuzzy commitment scheme is one of most popular biometric cryptosystems that aim at securing cryptographic keys using biometrics. Because of the high recognition accuracy exhibited by the iris, iris-based fuzzy commitment schemes, among other modalities, provide the most practical performance rates. Unfortunately, existing iris-based fuzzy commitment schemes do not incorporate noise masks, g...

Purpose: To demonstrate an approach to the problems of cataract surgery in extensive iridoschisis Methods: Four eyes of 2 patients with extensive iridoschisis had cataract surgery by the same surgeon using the techniques that resembled techniques for phacoemulsification in intraoperative floppy iris syndrome (IFIS). We used low flow parameters on phacoemulsification, used super-cohesive ophthal...