Biološka trajnost i tehnička svojstva toplinski modificirane topolovine

Abstract The aim of this study was to evaluate the effect of brown rot fungus Coniophora puteana activity on physical and mechanical properties as well as biological resistance of heat-treated poplar wood. Two poplar wood species (Populus deltoids and Populus nigra) were heat-treated by thermo-wood (Thermo-D) method. Control and heat-treated specimens were exposed to brown rot fungus C. puteana for 16 weeks. Physical and mechanical characteristics of specimens including density, compression strength parallel to the grain and impact strength were evaluated before and after exposure to fungus. Mass loss of specimens caused by fungal activity (MLF) was also calculated. In addition, the effect of thermal modification on laccase production by C. puteana was assayed. The highest mass loss due to fungal deterioration was observed in control specimens, coinciding with the highest substrate-enzyme interactions and constant decrease in detectable laccase levels. According to the results, thermal modification can be used effectively to protect poplar wood against brown rot fungus attack.Cilj ovog istraživanja bio je procijeniti utjecaj gljive smeđe truleži Coniophora puteana na fizička i mehanička svojstva te na biološku otpornost toplinski modificirane topolovine. Dvije vrste topolovine (Populus deltoids i Populus nigra) toplinski su modificirane postupkom thermo wood (Thermo D). Kontrolni i toplinski modificirani uzorci bili su izloženi 16 tjedana gljivi smeđe truleži C. puteana. Prije i nakon izlaganja gljivama određena su fizička i mehanička svojstva uzoraka uključujući gustoću, čvrstoću na tlak paralelno s vlakancima i čvrstoću na udarac. Također je izračunan gubitak mase uzoraka kao posljedica aktivnosti gljiva (MLF). Osim toga, ispitan je utjecaj toplinske modifikacije na stvaranje lakaze zbog djelovanja gljive C. puteana. Najveći gubitak mase, tj. najveća razgradnja nastala djelovanjem gljive zabilježena je na kontrolnim uzorcima, a to se podudara s najjačim međusobnim djelovanjem supstrata i enzima te s konstantnim smanjenjem detektirane razine lakaze. Prema dobivenim rezultatima, toplinska se modifikacija može učinkovito iskoristiti za zaštitu topolovine od napada gljiva smeđe truleži

The Effect of Job Stress on Nurses' Caring Behaviors and Quality of Life Related to Their Health in Coronavirus Pandemic

Introduction: Stressed people are physically, psychologically, and behaviorally damaged. This study aimed to investigate the effect of job stress on nurses' caring behaviors and quality of life related to their health during Coronavirus pandemic.Methods: The present study is an applied and analytical research conducted cross-sectionally in 2021. The study's statistical population was 740 nurses from the hospitals of Mazandaran University of Medical Sciences. The authors randomly selected a sample of 253 nurses using Cochran's formula. The data collection tool was a standard questionnaire. The structural equation model test analyzed the collected data to measure the research hypotheses using SPSS 22 and Amos 22 softwareResults: The standard coefficient value between stress and caring behavior is -0.47, and the significant value (t-value) is greater than 1.96 (equal to 5.350) at 95% level; therefore, the relationship between these two variables was found significant. Moreover, the standard coefficient value between job stress and quality of work life is -0.55, and the significant value (t-value) is greater than 1.96 (equal to 6.488) at the 95% level, showing a significant relationship between these two variables.Conclusion: Considering the obtained results, it is necessary to develop effective strategies, such as staff participation in decision-making, supervisory support, and reducing work pressure for improving working conditions and reducing nurses’ occupational stress

Effect of Thymus Vulgaris Ethanol Extract, on Serum Total Antioxidant in Experimental Induced Poly Cystic Ovarian Syndrome (PCOs) Rats

Background: Poly cystic ovary syndrome is one of the most common female endocrine disorders. One of the side effects of PCOS is oxidative stress.. Here we investigated antioxidants effects of Thymus vulgaris ethanoli extract on experimental PCOS induced rats by estradiol-valerat (PPA).Methods: Wistar female rat (n=70) were divided into 7 groups including C1: an equal volume of (0.9% NaCl) as placebo; C2: extract (0.6cc/rat/orally/daily); C3: induced PCO by single injection of estradiol-valerate (4mg/rat/IM), and T1: PCOS induced  rats + an equal volume of (0.9% NaCl) as placebo, T2: PCOS induced rats + extract(0.2cc/rat/orally/daily), T3: PCOS induced rats + extract (0.4cc/rat/orally/daily), T4:PCOS induced rats+extract (0.4cc/rat/orally/daily) test groups, were received extract supplement, for 60 consequence days. Animals were kept in standard conditions. In last day of study the blood samples of rats in whole groups were obtained and prepared to biochemical analysis.Results: Total antioxidant capacity level, superoxide dismutase and catalase activity were significantly increased in PCOS treated groups (P<0.03), these parameters in PCOS groups that did not receive extract significantly decreased (P<0.05) in comparison to control. Level of MDA in PCOS groups were significantly increased as compared to control and extract treated groups (P<0.01).Conclusions: Our results disclosed that administration of Thymus vulgaris ethanol extract significantly restitution tissue antioxidants level in PCOS induced rats.

Effect of Thymus Vulgaris Ethanol Extract, on Serum Total Antioxidant in Experimental Induced Poly Cystic Ovarian Syndrome (PCOs) Rats

Background: Poly cystic ovary syndrome is one of the most common female endocrine disorders. One of the side effects of PCOS is oxidative stress.. Here we investigated antioxidants effects of Thymus vulgaris ethanoli extract on experimental PCOS induced rats by estradiol-valerat (PPA).Methods: Wistar female rat (n=70) were divided into 7 groups including C1: an equal volume of (0.9% NaCl) as placebo; C2: extract (0.6cc/rat/orally/daily); C3: induced PCO by single injection of estradiol-valerate (4mg/rat/IM), and T1: PCOS induced  rats + an equal volume of (0.9% NaCl) as placebo, T2: PCOS induced rats + extract(0.2cc/rat/orally/daily), T3: PCOS induced rats + extract (0.4cc/rat/orally/daily), T4:PCOS induced rats+extract (0.4cc/rat/orally/daily) test groups, were received extract supplement, for 60 consequence days. Animals were kept in standard conditions. In last day of study the blood samples of rats in whole groups were obtained and prepared to biochemical analysis.Results: Total antioxidant capacity level, superoxide dismutase and catalase activity were significantly increased in PCOS treated groups (P<0.03), these parameters in PCOS groups that did not receive extract significantly decreased (P<0.05) in comparison to control. Level of MDA in PCOS groups were significantly increased as compared to control and extract treated groups (P<0.01).Conclusions: Our results disclosed that administration of Thymus vulgaris ethanol extract significantly restitution tissue antioxidants level in PCOS induced rats.

Two Iranian families with a novel mutation in GJB2 causing autosomal dominant nonsyndromic hearing loss

Mutations in GJB2 , encoding connexin 26 (Cx26), cause both autosomal dominant and autosomal recessive nonsyndromic hearing loss (ARNSHL) at the DFNA3 and DFNB1 loci, respectively. Most of the over 100 described GJB2 mutations cause ARNSHL. Only a minority has been associated with autosomal dominant hearing loss. In this study, we present two families with autosomal dominant nonsyndromic hearing loss caused by a novel mutation in GJB2 (p.Asp46Asn). Both families were ascertained from the same village in northern Iran consistent with a founder effect. This finding implicates the D46N missense mutation in Cx26 as a common cause of deafness in this part of Iran mandating mutation screening of GJB2 for D46N in all persons with hearing loss who originate from this geographic region. © 2011 Wiley-Liss, Inc.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/83755/1/33209_ftp.pd

The influence of fiber chemical treatment on prevention of biologic deterioration of medium density fiberboard (MDF)

Abstract In this research, the effects of acetylation on the prevention of white-rot and brown-rot fungi deterioration in medium density fiberboard (MDF) were investigated. Sample boards were made from acetylated poplar fibers, which were treated at different times (0, 30, 90 and 270 minutes) to obtain different weight percent gains (WPGs of 0, 4.85, 9.1, and 15.8 %). Totally  twelve samples boards at three replication for every treatment were made.. The results were analyzed based on a complete randomized design (CRD) under a factorial experiment. Results revealed that the acetylation decreased the deterioration effect of white-rot and brown-rot fungi. As it was determined, the weight reduction of acetylated boards with the highest WPG (15.8 %) after 16 weeks were measured as 1.605 % and 16.93 % for white and brown-rot fungi, respectively. It was also determined that the weight loss of the control (untreated boards) samples was measured as 39.96 and 49.31% in the same period. The research results showed that the acetylation enhances biologic resistance in  medium density fiberboard

Seroepidemiological prevalence of brucellosis in livestock breeders of the central rural area of Bushehr province 2003-4

Background: Brucellosis is the most important zoonotic disease. As Brucellosis is endemic in Iran, this study was designed to evaluate seroepidemiological prevalence of brucellosis in livestock breeders of the central rural area of Bushehr province in 2003-2004. Methods: Sera of 397 livestock breeders from the central rural area of Bushehr province were collected and tested for anti-brucella IgG antibody using ELISA method. Results: The prevalence of brucellosis in livestock breeders was 10.8%. Brucella seropositively was found to have a significant association with sheep contact and abortion in domestic animals (p<0.05) but anti-brucella Ig antibody positivity had not a significant association with sex, age, contact with cattle, goats and camel, keeping livestock at home, consumption of milk products and raw milk, history of brucellosis in person and/or family and nonspecific signs such as fever, myalgia, low back pain and artheralgia. Conclusion: The prevalence of brucellosis is high in the central rural area of Bushehr province. The prevalence was much higher among livestock breeders in contact with sheep and also in those who had abortion in their domestic animals