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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: VETERINARY RESEARCH FORUM
- نوع مقاله: Journal Article
- کلمات کلیدی: Mouse,Stress oxidative,Phenylhydrazine,Sperm parameters,Ethyl pyruvate
- چکیده:
- چکیده انگلیسی: The aim of the present study was to assess the protective effect of ethyl pyruvate (EP) on sperm quality parameters, testosterone level and malondialdehyde (MDA) in phenylhydrazine (PHZ) treated mice. For this purpose, 32 NMRI mice with the age range of 8 to 10 weeks, weight average 26.0 ± 2.0 g, were randomly divided into four equal groups. The control group (1) received normal saline (0. 1 mL per day) by intraperitoneal injection (IP). Group 2 (PHZ group) was treated with initial dose of PHZ (8 mg 100 g-1, IP) followed by 6 mg 100 g-1 , IP every 48 hr. Group 3, (Group PHZ+EP) received PHZ (according to the previous prescription) with EP (40 mg kg-1, daily, IP). Ethyl pyruvate group (4) received only EP (40 mg kg-1, daily, IP). Treatment period was 35 days. After euthanasia, sperms from caudal region of epididymis were collected and the total mean sperm count, sperm viability, motility and morphology were determined. Testis tissue MDA and serum testosterone levels of all experimental groups were also evaluated. A considerable reduction in mean percentage of number, natural morphology of sperm, sperm motility and viability and serum testosterone concentration besides DNA injury increment among mice treating with PHZ in comparison with control group were observed. However, in PHZ+EP group the above mentioned parameters were improved. This study showed that PHZ caused induction of toxicity on sperm parameters and reduction of testosterone as well as the increment of MDA level and EP as an antioxidant could reduce destructive effects of PHZ on sperm parameters, testosterone level and lipid peroxidation.
- انتشار مقاله: 24-12-1394
- نویسندگان: Ali Akbar Mozafari,Rasoul Shahrooz,Abbas Ahmadi,Hassan Malekinjad,Karim Mardani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Medicinal plants and By-product
- نوع مقاله: Journal Article
- کلمات کلیدی: Achillea,Iran,morphology,Genetic diversity,Peroxidase
- چکیده:
- چکیده انگلیسی: Fifteen yarrow populations from different species Achillea millefolium L., A. biebersteinii L. and A. nobilis, from different geographical areas of Iran were studied using 24 morphological traits and peroxidase profiles. Comparison of mean values of different phenotypic traits show A. millefolium and A. biebersteinii L. had higher plant height and crown diameter; however, A. nobilis had higher dry matter yield and 1000-grain weight. Clustering pattern, made on the basis of different phenotypic traits, grouped the Achillea populations differently and gave no clear indication of origin or species. The results of peroxidase profiles revealed that the genetic diversity of A. nobilis samples was considerably higher than in A. millefolium and A. biebersteinii. Principal coordinate analysis revealed a clear separation between the different Achillea species. The results demonstrated that the study of genetic diversity and relationships among Achillea species using phenotypic traits and peroxidase profiles provides important information for the collection, conservation and the planning of future breeding programs.
- انتشار مقاله: 09-09-1378
- نویسندگان: Parvin Salehi Shanjani,Valiolah Mozafarian
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Advanced Biological and Biomedical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Climate Change,Growing Season,Man-Kendal,West of Iran
- چکیده:
- چکیده انگلیسی: Objective: An increasing number of studies have reported on shifts in timing and length of the growing season, based on phonological, satellite and climatologically studies. Changes in the timing and length of the growing season (GSL) may not only have far reaching consequences for plant and animal ecosystems, but persistent increases in GSL may lead to long-term increases in carbon storage and changes in vegetation cover which may affect the climate system. With the aim of these study is an investigation the trend of time changes of starts and end season growing length in west of Iran. Methods: This investigation has presented 49 years inputs of temperature from 8 synoptic stations in west of Iran. Homogenize the series using run-test experiment were determined and accomplished in the way of auto regression from rebuilding of missed data by way of man-Kendal test the randomness of data was examined and the series that had change or trend with %5 confidence interval were recognized then with graphically man-Kendal test and moving mean of 5 year, circumstances and the start time of trend or changes were determined and the values of changes were calculated. Results: The results show more changes in series associating with start and end of temperatures.
- انتشار مقاله: 25-12-1393
- نویسندگان: Gholamali Mozafari,Moslem Torki
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Advanced Design and Manufacturing Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Failure,Numerical simulation,Experimental Test,One–Way Valve,Reciprocating Compressor
- چکیده:
- چکیده انگلیسی: Nowadays most of reciprocating compressors have one - way valves that act by difference pressure between behind and front of valves. In this article, experimental and numerical studying of one - way valves in reciprocating compressors was done. In this experimental tests, one – way valve with two different materials for rings; stainless steel with the material number 1.5022 and sign 38si6, and carbon-peek composite, were used. Numerical simulation for one-way valves with identical characteristics of experimental tests was done by CFX 5.7.1 and Ansys workbench 9.1. Experimental tests showed that life of carbon-peek composite ring was more than stainless steel. The most important cause of failure in the stainless steel ring was inappropriate distribution of forces due to the springs below the ring. Another common cause of failure in these valves was the stresses on walls in the location of springs that approved by numerical simulation. Difference in reaction of one - way valves in opening and closeing was another cause of failure because they were different in thermal expansion coefficient, thickness and diameter of carbon-peek composite and stainless steel rings. Appropriate thickness of rings determined by flow equation. The results obtained from numerical simulations have a good agreement with experimental tests.
- انتشار مقاله: 09-08-1397
- نویسندگان: Mostafa Sayahbadkhor,Ali Mozafari,Alireza Naddaf Oskouei
- مشاهده