فهرست مطالب asma askari

Teeth can be used to determine age in forensic medicine if none of the other techniques of identification are appropriate. The researchers used panoramic radiographs from patients referred to Yazd Shahid Sadoughi Dental School to determine age using pulp/tooth perimeter ratio.

In this diagnostic study, 800 panoramic digital radiographs were examined and the age of the patients was recorded. The pulp/tooth perimeter ratio of the maxillary canine was calculated by using AutoCAD software, and the patient's age was estimated by using a regression equation. Then, a comparison was made between the estimated age and the actual age using this method. The role of sex, tooth placement in each quadrant and decade of age was examined in this ratio. For analysis, linear regression and paired T-test and correlation coefficients according to age and gender were used in SPSS 16 statistical software.

A linear regression model was used to estimate the age using pulp/tooth perimeter ratio. As a result, the Pearson correlation coefficient between age and pulp/tooth perimeter ratio was r = -0/08. We discovered a negative and significant correlation between these two variables with a P= 0.024. Likewise, the correlation coefficient in women was calculated r = -0.087, which with P= 0.037, this correlation is also significant and inverse.

The study showed that estimating age using the pulp/tooth perimeter ratio of the maxillary canine is a reliable method and the pulp/tooth perimeter ratio on the left side is correlated with dental age. Thus, using the pulp/tooth perimeter ratio to estimate age in women is also valid.

The dogs' relationship with their owners has made them one of the most popular pets. They can be a reservoir of many microbial pathogens, so they are important for public health. This study was performed to determine the phylogenetic backgrounds and antimicrobial resistance of E. coli isolates from healthy household dogs and their owners in Kerman province, Iran. Samples were taken regardless of antibiotic usage in the dogs. Based on the history of the animals, 90% of them had not used antibiotics during the few months before the study. 168 E. coli strains belonging to feces of healthy household dogs (n=49), their owners (n=49) and the people without a pet (n=70) were studied; phylogenetic sequences including chuA, yjaA and TspE4.C2 were screened by conventional polymerase chain reaction (PCR). The isolates were investigated phenotypically for antimicrobial resistance against 11 commonly used antibiotics in dogs which were erythromycin, streptomycin, enrofloxacin, oxytetracycline, cefotaxime, ampicillin, trimethoprim-sulfamethoxazole, amoxicillin-clavulanic acid, ceftazidime, ceftriaxone and kanamycin. E. coli isolates were classified into A, D, B1 and B2 phylogroups with the prevalence of 55.9%, 30.3%, 7.1% and 5.3%, respectively. Considerably, antimicrobial resistance to erythromycin and oxytetracycline were predominant while the lowest frequency of antibiotic resistance was detected against ceftriaxone, ceftazidime, amoxicillin-clavulanic acid and kanamycin. This study was performed on apparently healthy dogs so it could determine their carrier role for antibiotic-resistant E. coli strains. This research revealed that healthy household dogs should be considered as the significant reservoir of resistant E. coli isolates especially to erythromycin, oxytetracycline, streptomycin, enrofloxacin, cefotaxime and ampicillin which these resistant strains were mostly belonging to A and D phylogenetic groups.

Intestinal pathotypes of Escherichia coli belong to the companion animals may poses potential risk to public health following zoonotic transmission. Therefore, this study was proposed to determine the virulence genes associated to diarrheagenic E. coli strains isolated from healthy pet dogs and their owners in the southeast of Iran, Kerman province.

Totally 168 E. coli isolates were collected from 49 healthy household dogs and their owners. Seventy isolates were obtained from non-pet owners as control group. Presence or absence of the virulence genes including eae, stx1, stx2, st1, lt1, ipaH, cnf1 and cnf2 were screened by conventional polymerase chain reaction (PCR) and dissemination pattern of the genes were studied among the various hosts.

PCR examinations showed that the most frequent virulence gene was ipaH (6.1%) in dogs followed by eae in dog owners (6.1%) and in controls (8.6%). The most frequent pathotypes in dogs, their owners and controls were EIEC (6.1%), EHEC (4.08%) and EPEC (8.5%), respectively. In one of studied houses, both of dog and its owner harbored E. coli strains with same virulence profile (stx1/eae) and pathotype (EHEC).

These results collectively indicate that healthy household dogs probably are the mild reservoir of potential virulent E. coli strains with possible active transmission to their contact owner. However, even non-pet owners seemed to be a notable source of intestinal pathotypes, especially EPEC, for their environment. Transmission of E. coli pathotypes may occurs by direct contact with the reservoirs or ingestion of contaminated food. These pathotypes are potentially virulent and creates public health hazards. Further studies are needed for better understanding of dissemination mechanisms of E. coli pathotypes among humans and their pets.

Aim: The present study was conducted to detect the occurrence, serogroups, virulence genes and phylogenetic relationship of shiga toxin-producing Escherichia coli (STEC) in human, clave and goat in Kerman (southeast of Iran).
STEC have emerged as the important foodborne zoonotic pathogens causing human gastrointestinal disease and confirming the risk to public health.
A total of 671 fecal samples were collected from diarrheic patients (n=395) and healthy calves (n=156) and goats (n=120) and screened for the presence of stx gene. Furthermore, the prevalence of stx1 and stx2 variants, serotypes (O157, O145, O103, O26, O111, O91, O128, and O45), phylogenetic groups and the presence of ehxA, eae, hylA, iha and saa virulence genes were studied.
Prevalence of STEC in human diarrheic isolates was 1.3% (5 isolates), in claves was 26.3% (41 isolates) and in goats was 27.5% (33 isolates). stx1 gene was the most prevalent variant and detected in 75 isolates. Furthermore, stx1c was the most predominant stx subtype, found in 56 isolates. The ehxA identified in 36 (45.6%) isolates, followed by iha 5 (6.3%), eaeA 4 (5.1%), hlyA 2 (2.5%) and saa 2 (2.5%). Most of the isolates belonged to phylogroup B1. Only two O26 and one O91 isolates were detected in our study.
Our results show that STEC strains were widespread among healthy domestic animals in the southeast of Iran

Latex agglutination test for Kala-azar (KAtex) is an easy, inexpensive, and field-applicable antigen detection test. However, the main drawback of this method is the boiling step applied to remove false positivity of the test. This study was conducted to survey false positivity results of latex agglutination test for KAtex without boiling process in urine of some autoimmune patients.
Ninety-two urine samples from autoimmune patients including systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), scleroderma, autoimmune vasculitis, vitiligo, pemphigus and Wagner cases and 20 urine samples from healthy individuals were collected from Kerman Province in Southeastern Iran in 2010-2011. All urine samples were checked by KAtex after boiling for 5 min false positivity rate of the test was surveyed in different healthy and patients groups while boiling process was removed. Rheumatoid factor (RF) then was checked in sera of all cases to evaluate the relationship between RF and KAtex false positivity.
All samples represented negative results with KAtex when boiling was performed (100% specificity). Then, 20% positivity was evident in healthy cases. False-positive reactivity was more prominent observed in patient groups than healthy individuals, except in vitiligo. However, a significant difference was only observed in RA group (P RA was described as the autoimmune disease in which KAtex false positivity was higher than normal population. RF or its metabolic products may have role in false positivity of KAtex but this finding needs to be confirmed by more reliable and improved experiments. Overall, immune system products should be considered in attempts for modification of KAtex for boiling process removal.

Colibacillosis caused by avian pathogenic Escherichia coli (APEC) is an economic threat to the poultry industry throughout the world. Some of the virulence genes may enhance the ability of E. coli isolates to grow in the tissues of broilers. The APEC strains are assigned to a few distinct phylogenetic groups. The purpose of the present study was to detect the virulence genes and phylogenetic groups of E. coli isolates from colibacillosis cases in Japanese quail in 2014 in Kerman, Iran. In the present study, one hundred and two E. coli isolates were obtained from dead Japanese quails with colibacillosis. E. coli isolates were confirmed by standard biochemical and bacteriological methods. DNA of E. coli isolates was extracted by boiling method. The confirmed E. coli isolates were investigated to detect the phylogenetic groups and virulence genes including sfa/focDE, afaIBC, papEF by PCR methods. E. coli isolates were classified into A (62 isolates), B1 (24 isolates), B2 (12 isolates) and D (four isolates) phylogenetic groups. Among examined isolates nine isolates (8.82%) were positive for papE-F, five isolates (4.90%) for afaIB-C and two isolates (1.96%) for sfa/focD-E genes. Based on our findings, E. coli isolates from colibacillosis of Japanese quail could be assigned to various phylogenetic groups (mostly A and D), and they may contain the adhesion genes in a low prevalence.

Terahertz radiation is non-destructive and hence, in the last two decades it has been of interest to researchers for various applications such as medical imaging. Having an accurate model of the tissue can pave the way for the researches in this field. In the terahertz region, water has high absorption and due to high water content in body tissues, the main mechanism of contrast in terahertz medical imaging in adjacent tissues is the difference in water content. Thus, dielectric models are suitable for modeling body tissues.
In this study, goodness of fit of double-Debye, Cole-Cole and Fitzgerald dielectric models to experimental data of the body tissues was evaluated. For qualitative assessment, the correlation coefficient between simulated values and experimental data was calculated.
Findings: Skin tissue was more compatible with the double-Debye model; breast tissue was more consistent with the Fitzgerald model and other investigated tissues were compatible with the Cole-Cole model.
Cole-Cole model is a general model, which can achieve a correlation of about 0.9 for a wide variety of tissues. Double-Debye and Fitzgerald models are specific models, which have higher accuracy for skin and breast tissues and whose correlation coefficient is about 0.95.