نتایج جستجو برای: presence and absence

تعداد نتایج: 16867964  

Journal: :تحقیقات دامپزشکی 0
دکتر پرویز تاجیک

bovine oocytes matured in culture were denuded from cumulus cells with hyaluronidase and by repeat pipetting trough a fine pasture pipete and were inseminated with frozen-thawed spermatozoa in a protein-free bo medium containing 5m m-caffeine, l0 mg heparin/ml and with or without polyvinyl pyrrolidone (pvp) and different concentrations of hyaluronic acid. when oocytes were inseminated in the ab...

Journal: :Postdigital Science and Education 2021

Abstract The literature on space in higher education has arguably been dominated by the concept of ‘learning spaces’. In this paper, I will argue that construct, while appearing student-focused and creative, is ideologically circumscribed an underlying social constructivism. Following Bayne et al. (2014), draw science technology studies to consider topologies, particular regional space, network...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2013
chirravuri venkata subbarao yanamala phanikumar yadav, pulipati king

efflux time measurements are carried out for gravity draining of a liquid from a large cylindrical tank (where the flow is essentially laminar) through single exit pipe in the absence and presence of cetyl pyridinium chloride (cpc) surfactant solutions. the variables considered are initial height of liquid in the tank, dia. of tank, length of the exit pipe and concentration of surfactant. the d...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده شیمی 1389

in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...

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