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Articles by M. Shakeri
Total Records ( 2 ) for M. Shakeri
  A.R. Jafarian and M. Shakeri
  Different models have been proposed to investigate the effects of various process parameters on shrinkage of plastic parts, which in most cases the effect of each parameter is obtained by changing one factor at a time. In this research, a simple flat model has been used and a simulation code has been developed. Then, through this simulation code, the effects of different process parameters have been investigated. This code was run for a typical thermoplastic (polycarbonate) and finally, a Design Of Experiments (DOE) approach was used to study the effects of multiple variables on shrinkage simultaneously.
  M. Shakeri , H. Roshanfekr , M. Mamoei and Kh. Mirzadeh
  The present research studied the effect of the interval between animal`s death and sperm recovery (0, 24 or 48h) on the quality and freezability of ram spermatozoa from cauda epididymidis. Storage temperature of epididymes (room temperature or 5°C) was also analyzed. Spermatozoa were diluted with Tes-Tris-Fructose solution supplemented with egg yolk (10%) and glycerol (4%) and frozen using a programmable bio-freezer (-20°C min-1). Pre-freeze and post-thaw sperm samples showed viable spermatozoa up to 48h after the animal`s death, although their quality declined significantly as post-mortem storage time increased. Epididymes sperm stored at 5°C showed better motility and a lower percentage of abnormal forms than epididymes stored at room temperature after 24 and 48h. The fertilizing ability of cauda epididymis ram spermatozoa obtained at 0 and 24h after the animal`s death is similar to that of ejaculated spermatozoa. Therefore, a good protocol for post-mortem semen collection in rams when epididymal spermatozoa cannot be collected immediately is to preserve the epididymes at 5°C and process the samples in the first 24h after the animal`s death.
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