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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Testis,Goat,Vitamin C,Sperm,Semen
- چکیده: اثر تزریق زیرپوستی ویتامین ث بر ویژگیهای منی بزهای مرخز (٢ تا ٤ سال سن) بررسی شد. بزهای نر به سه گروه چهار تایی تقسیم و به ترتیب، با مقادیر صفر (یک میلیلیتر محلول نمک فیزیولوژیک)، ٢٠ میلیگرم و ٤٠ میلیگرم ویتامین ث به ازای هر کیلوگرم وزن زنده و به طور روزانه بین ٦ ژوئیه ٢٠٠٦ تا ٦ اکتبر ٢٠٠٦ (١٥ تیرماه تا ١٥ مهرماه ١٣٨٥) تزریق شدند. نمونههای خون از سیاهرگ گردن، ماهانه و نمونههای منی هر ١٥ روز یکبار با به کارگیری واژن مصنوعی، گرفته شد. ابعاد بیضه (محیط بیضهها درون اسکروتوم، و طول و عرض آنها) یک روز پیش از اسپرمگیری، اندازهگیری شد. اثر اصلی ویتامین ث و برهمکنش بین ویتامین ث و زمان نمونهبرداری بر اندازههای بیضه معنیدار نبود. اثر برهمکنش ویتامین ث و زمان نمونهبرداری بر غلظت ویتامین ث در پلاسمای خون و مایع منی، و نیز بر میزان جنبایی اسپرم، درصد اسپرم زنده، ناهنجاریهای اسپرم، و شمار کل اسپرم زنده و بهنجار معنیدار بود. ویتامین ث موجب افزایش معنیدار درصد اسپرمهای دارای حرکت پیشرونده شد. مقدار ٤٠ میلیگرم ویتامین ث موجب افزایش میزان جنبایی اسپرمها شد و این اثر تا یک ماه پس از قطع تزریق ویتامین، همچنان دیده شد. درصد اسپرمهای زنده و حرکت کلّی اسپرمها نیز الگوی همانندی را نشان دادند. تأثیر دوزهای ٢٠ و ٤٠ میلیگرم ویتامین ث بر کاهش درصد اسپرمهای نابهنجار یکسان بود. شمار کل اسپرمهای زنده و بهنجار نیز در پی تزریق ویتامین ث افزایش یافت و این اثر تا مدتی پس از قطع تزریق ویتامین ث، پدیدار بود. یافتههای این آزمایش، اهمیت ویتامین ث را برای تولیدمثل بزهای نر نشان میدهد، همچنان که برای دیگر پستانداران نیز گزارش شده است. از سویی، در برخی شرایط ممکن است سنتز ویتامین ث در بدن نشخوارکنندگان برای تولید مثل بهینه، بسنده نباشد.
- چکیده انگلیسی: The effect of subcutaneous injections of vitamin C on the seminal characteristics of Markhoz bucks (2–4-
year-old) was studied. The bucks, trained to serve an artificial vagina, were randomly allotted into three equal groups (n = 4) and received daily either zero (1 mL normal saline; control group), or 20 (VitC20 group) or 40 (VitC40 group) mg per kg body weight vitamin C from July 06, 2006 to Oct. 06, 2006. Blood samples were taken from the jugular vein at monthly inter, als, and semen samples were collected at 15-day intervals. Testicular dimensions in the scrotum (circumference, width, and length) were also determined on the day before semen collection. The ejaculates were evaluated for volume, sperm concentration, pH, motility, and abnormal and live sperm. Testicular measurements were not affected by administration of vitamin C. The interaction between vitamin C and the sampling time was significant (P<0.05) for the concentration of vitamin C in the blood plasma and seminal fluid, sperm motility, sperm viability, sperm abnormality, and the number of live-normal sperm in the ejaculate. Vitamin C increased the levels of vitamin C in blood and seminal plasma. Both doses of vitamin C increased the percentage of progressively motile sperm showing forward motility. VitC40 injection for 90 days increased sperm motility and the effect was still evident up to 30 days after the cessation of injections. The percentage of live sperm and mass motility showed similar trends. Both doses were equally effective in decreasing the percentage of abnormal sperm. The total number of live and normal sperm in the ejaculate increased by vitamin C injections and the effect was still evident after the injections had been discontinued. The present data indicates the importance of vitamin C in the reproduction of male goats, as also shown for several mammalian species. They further show that under certain conditions, the in vivo synthesis of this vitamin in ruminants might not be sufficient for optimum reproduction.- انتشار مقاله: 12-05-1388
- نویسندگان: P. Fazeli,M. J. Zamiri,A. Farshad,B. Khalili
- مشاهده
- جایگاه : پژوهشی
- مجله: Desert
- نوع مقاله: Journal Article
- کلمات کلیدی: Tillage,Inceptisols,Soil Hydraulic Properties,Soil pore size distribution
- چکیده:
- چکیده انگلیسی: The current study was conducted to investigate the effect of tillage methods, residue rates, and forward speeds on the soil-water characteristic curve (SWCC) of Haploustepts soil over the course of one crop year (2014-2015). The treatments consisted of conventional mechanized tillage (CT: moldboard plough+disc) and reduced tillage (RT1: chisel peker+plough and RT2: combined tillage), different surface residues, including three levels of no residue, 40% residue, and 80% residue, and forward speeds at three levels: low (4 km/h), normal (7 km/h), and high (10 km/h). The experimental water retention data were fitted to uni-modal van Genuchten (termed uni-modal vG) and bi-modal Dexter (termed bi-modal Dex) models. No significant impact was observed on different physical parameters, except for parameter n. In the slope at the inflection point of SWCC, 11.8% and 8.9% reductions were observed in CT and RT1 treatments, respectively, compared to RT2. Based on the results, measured under CT tended to be higher than that of other tillage treatments. Residual covers and higher forward speeds tended to increase both and . Changes in PSD were more pronounced in larger (macro) and medium (meso) pore diameter classes. The highest value of structural void ratio as transmission pores was observed in RT2. This finding indicates that with respect to , , , and values, the soil PSD descriptive system is a bi-peak distribution such as H-L; therefore, due to the hierarchical nature of soil structure, van Genuchten equation cannot appropriately describe multi-modal soils inherently.
- انتشار مقاله: 19-03-1399
- نویسندگان: A. Shojaee,B. Khalilimoghaddam,F. Moradi
- مشاهده
- جایگاه : پژوهشی
- مجله: Desert
- نوع مقاله: Journal Article
- کلمات کلیدی: Dust,Efficiency,Wind erosion,Cyclone samplers,Khuzestan
- چکیده:
- چکیده انگلیسی: The objective of this study was to assess the efficiency of three mathematical models (power, exponential and logarithmic functions) for the calculation of the horizontal mass transport (HMT), as compared to the linear spline interpolation for the Cyclone Dust Sampler (CDS) and one with a Cone (CDSC), modified Wilson and Cooke trap (MWAC) and big spring number eight (BSNE). For the purposes of this study, wind erosion was measured at wind velocities of 2–7 ms−1 on a clay loam soil in wind tunnel experiments. The test results showed that the HMT of BSNE, MWAC, CDS, and CDSC samplers, calculated by these equations, fitted well to each other (p<0.01), such that the HMTs of MWAC (HMTM), CDS (HMTS), CDSC (HMTSC), respectively, were 1.10-1.45, 2.28-2.45, 2.48-2.81 times higher than that of BSNE (HMTB), depending on the equation used. The power equation yielded the best adjustments to HMF as a function of the height. Moreover, the relative efficiencies of CDS, CDSC, and MWAC varied between 140-200%, 220-540%, and 410-860%, respectively. Compared to the MWAC sampler, CDS and CDSC samplers showed a rapid drop in relative efficiency with increasing wind speed. These higher efficiencies of the CDS and CDSC relative to BSNE were attributed to its cyclone design. Adding cone to the CDSC sampler increases its efficiency compared to the CDS sampler, protects the settled dust from resuspension.
- انتشار مقاله: 10-02-1396
- نویسندگان: S. Abdoli,B. Khalilimoghadam,M. Rahnama,M. Soleimani
- مشاهده
- جایگاه : پژوهشی
- مجله: Desert
- نوع مقاله: Journal Article
- کلمات کلیدی: AHP,Ahvaz,GIS,Green spaces,Urban soil
- چکیده:
- چکیده انگلیسی: Soil is a vital parameter for planting design in urban green spaces especially in adverse climate conditions. In this study, the utilization of analytic hierarchy process (AHP) in surveying land suitability for urban green space from measured criteria like suitability indices, including physical (i.e. clay, silt, sand, bulk density, penetration resistance), chemical (i.e. electrical conductivity, sodium absorption ratio, organic matter, Olsen phosphorus, water soluble potassium and DTPA-extractable of Fe, Zn, Cu, Mn) and heavy metal (i.e. total Ni, Cd and Pb) properties of soil and topography attributes (i.e. slope degree) data were investigated. The subjective value judgment, in light of questionnaire survey was utilized for pair-wise comparison after standard AHP method in a structure of four criteria (suitability indices) alongside related sub-criteria (19 factors). AHP method and GIS techniques were combined to create suitability map. The outcomes demonstrated that less than 8.86% of the all study region has no restriction and 34.54% has extreme restrictions for green space land use. The southern part of the riverside parks had higher suitability, whereas the northern area had lower suitability. The real limiting variables include soil compaction, soil salinity, and Zn deficiency; albeit direct mild accumulations were for lead in Ahvaz riverside parks. This study delineates the efficacy of AHP and weighted overlay model for the soil suitability investigation of green space in the study territory. In light of the outcomes, bulk density and organic matter are the most vital indices of soil in urban green space.
- انتشار مقاله: 20-05-1395
- نویسندگان: Z. Saeedavi,B. Khalili Moghadam,M. Bagheri Bodaghabadi,N. Rangzan
- مشاهده
- جایگاه : پژوهشی
- مجله: Desert
- نوع مقاله: Journal Article
- کلمات کلیدی: AHP,Ahvaz,GIS,Green spaces,Urban soil
- چکیده:
- چکیده انگلیسی: Soil is a vital parameter for planting design in urban green spaces especially in adverse climate conditions. In this study, the utilization of analytic hierarchy process (AHP) in surveying land suitability for urban green space from measured criteria like suitability indices, including physical (i.e. clay, silt, sand, bulk density, penetration resistance), chemical (i.e. electrical conductivity, sodium absorption ratio, organic matter, Olsen phosphorus, water soluble potassium and DTPA-extractable of Fe, Zn, Cu, Mn) and heavy metal (i.e. total Ni, Cd and Pb) properties of soil and topography attributes (i.e. slope degree) data were investigated. The subjective value judgment, in light of questionnaire survey was utilized for pair-wise comparison after standard AHP method in a structure of four criteria (suitability indices) alongside related sub-criteria (19 factors). AHP method and GIS techniques were combined to create suitability map. The outcomes demonstrated that less than 8.86% of the all study region has no restriction and 34.54% has extreme restrictions for green space land use. The southern part of the riverside parks had higher suitability, whereas the northern area had lower suitability. The real limiting variables include soil compaction, soil salinity, and Zn deficiency; albeit direct mild accumulations were for lead in Ahvaz riverside parks. This study delineates the efficacy of AHP and weighted overlay model for the soil suitability investigation of green space in the study territory. In light of the outcomes, bulk density and organic matter are the most vital indices of soil in urban green space.
- انتشار مقاله: 20-05-1395
- نویسندگان: Z. Saeedavi,B. Khalili Moghadam,M. Bagheri Bodaghabadi,N. Rangzan
- مشاهده