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Seasonal changes in testicular ultrasonogram pixel-intensity and their association with semen characteristics in rams

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Asian pacific Journal of Reproduction 2020年第1期9卷 49-54页

作者： Mohamed Gamal Hedia Mohamed Shehata el-Belely Sayed Taha Ismail amal mahmoud abo el-maaty Department of Theriogenology Faculty of Veterinary MedicineCairo UniversityGizaEgypt Department of Animal Reproduction and AI Veterinary DivisionNational Research CenterDokkiGizaEgypt

Objective:To establish reference values for pixel intensity of testicular ultrasonogram of rams in breeding and non-breeding seasons,and to investigate if the seasonal changes in testicular echogenicity and heterogeneity are associated with semen ***:Five Awassi rams aged 3-5 years old and weighing 45-60 kg were subjected to ultrasonographic scanning of the testes twice monthly for one year(from January 2018 to December 2018),together with semen collection and evaluation of ejaculate volume,sperm motility,sperm concentration,sperm morphology and *** ejaculate volume was determined in a graduated collection tube(scale of 0.1 mL).Mass and individual sperm motility was expressed in percentage of motile spermatozoa under optical microscope equipped with a warm *** concentration was determined by using a Neubauer *** smears stained with eosin-nigrosin were used to determine the percentage of live spermatozoa and sperm cell morphology by using a light ***:The mean testicular pixel intensity was the lowest in winter and increased gradually from breeding season to non-breeding season,reaching its maximum value in summer(Pel intensity was found to have a significant negative correlation with progressive motility(r=-0.605,Pely correlated with the percentage of sperm morphological abnormalities(r=0.666,Pel intensity values of testicular ultrasonogram in rams undergo marked seasonal changes that are associated with fluctuations in photoperiod and ambient *** resulting values of testicular echogenicity(pixel intensity)throughout the year provide useful reference values for predicting the testicular function in Awassi rams.

关键词： Testes Echotexture Pixel intensity Semen Season Rams

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Dust Acoustic Solitary Waves in Saturn F-ring's Region

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Communications in Theoretical Physics 2011年第1期55卷 143-150页

作者： E.K.el-Shewy M.I.abo el maaty H.G.Abdelwahed M.A.elmessary Theoretical Physics Group Faculty of ScienceMansoura University Mathematics and Physics Department Faculty of Engineering Mansoura University

Effect of hot and cold dust charge on the propagation of dust-acoustic waves （DAWs） in unmagnetized plasma having electrons, singly charged ions, hot and cold dust grains has been investigated. The reductive perturbation method is employed to reduce the basic set of fluid equations to the Kortewege-de Vries （KdV） equation. At the critical hot dusty plasma density Nho, the KdV equation is not appropriate for describing the system. Hence, a set of stretched coordinates is considered to derive the modified KdV equation. It is found that the presence of hot and cold dust charge grains not only significantly modifies the basic properties of solitary structure, but also changes the polarity of the solitary profiles. In the vicinity of the critical hot dusty plasma density Nho, neither KdV nor mKdV equation is appropriate for describing the DAWs. Therefore, a further modified KdV （fmKdV） equation is derived, which admits both soliton and double layer solutions.

关键词： dust-acoustic waves hot and cold dust charge double layer solutions

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