The present research work proposes a new fast fixed-point averaging algorithm on the compact Stiefel manifold based on a mixed retraction/lifting pair. Numerical comparisons between fixed-point algorithms based on the proposed non-associated retraction/lifting map pair and two associated retraction/lifting pairs confirm that the averaging algorithm based on a combination of mixed maps is remark...

Cordless retraction paste material for gingival retraction in implant dentistry has recently become of interest to the clinician. However, few studies have been conducted on the use of retraction pastes and their possible interaction with implant surfaces. This in vitro study evaluated the effect of a cordless retraction paste material, Expasyl® (Acteon), on TiUnite® (Nobel Biocare) implant sur...

Aim Article retraction is a measure taken by journals or authors where there is evidence of research misconduct or error, redundancy, plagiarism or unethical research. Recently, the retraction of scientific publications has been on the rise. In this survey, we aimed to describe the characteristics and distribution of retracted articles and the reasons for retractions. Methods We searched retr...

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We describe three patients with spinocerebellar ataxia (SCA) and marked eyelid retraction: A 33-year-old woman with ataxia, pyramidal signs and eyelid retraction; genetic test confirmed SCA1 (Figure A). A 41-year-old man with ataxia, ophthalmoplegia, neuropathy and eyelid retraction; genetic test confirmed SCA2 (Figure B). A 68-year-old man with ataxia, neuropathy, nystagmus and eyelid retracti...

Aquatic escape responses have typically been described as C-starts. However, another aquatic escape response, head retraction, occurs in several elongate species, but has never been studied in detail. The goals of this study are to describe the head retraction escape response in a phylogenetically diverse sample of species, to trace the evolution of head retraction in anamniote vertebrates, and...

The causative agent of gonorrhea, Neisseria gonorrhoeae, bears retractable filamentous appendages called type IV pili (Tfp). Tfp are used by many pathogenic and nonpathogenic bacteria to carry out a number of vital functions, including DNA uptake, twitching motility (crawling over surfaces), and attachment to host cells. In N. gonorrhoeae, Tfp binding to epithelial cells and the mechanical forc...

this study was performed to determine the prevalence of canine parvovirus (cpv) in dogs referred to veterinary hospital of ahvaz, khouzestan province, iran. fecal samples were collected from 78 diarrheic dogs between 2005 and 2007. the dogs were divided into two age groups (< 6 months and > 6 months), four different breeds (terriers, germanshepherds, doberman pinschers and mixed) and another tw...

between july and august 2009, a total of two hundred crossbreed dogs in three contiguous littoralprovinces of guilan, mazandaran and golestan were sampled. circulating antigens and/or microfilariae ofdirofilaria immitis were found in 25.5% of dogs in the whole studied area. the highest infection rate wasfound in guilan (51.42%), followed by golestan and mazandaran provinces (15.38% and 7.69%, r...

abstract : dens invagination (di) is a developmental abnormality of teeth which frequently results in a complex internal anatomy of the root canal system. di type 3 is an anomaly characterized by infolding of enamel and dentin extending into the root apex. this may present difficulties when forming a diagnosis and treatment plan. many treatment modalities have been presented in case reports for...