نتایج جستجو برای: hertwig effect
تعداد نتایج: 1641711 فیلتر نتایج به سال:
abstract the first purpose of this study was to investigate the effect of consciousness-raising (c-r) activities on learning grammatical structures (simple present tense in this case) by iranian guidance school efl learners. the second one was to investigate the effect of gender on learning the simple present tense through c-r activities and tasks. finally, this study aimed to investigate the ...
this is an original study on the effect of a polyisobutylene – polydimethylsiloxane (pibpdms) block copolymer modifier used as an interfacial active agent on the dynamics behaviour of single newtonian drops suspended in a polyisobutylene (pib) newtonian matrix. the results were divided in two sections. the first part included the experiments carried out on the non-modified and 2% block cop...
در اکثر فرآیند های مهندسی شیمی پدیده های انتقال جرم و انتقال حرارت جزو جدایی ناپذیر فرآیند ها می باشند. در این پروژه توسط یک دستگاه آزمایشگاهی به بررسی تجربی همزمان این دو پدیده در فرآیند های مهندسی شیمی و تاثیراتی که بر روی هم و بر روی فرآیند ها می توانند داشته باشند، پرداخته شده است. این دستگاه آزمایشگاهی بر اساس فرضیاتی ساخته و مورد بررسی قرار گرفته است که به قرار زیر می باشد: 1. وجود پدیده...
the hypothesis is that recent and frequent exposure to lexical items leads to a more fluent production of speech in terms of rate of speech. to test the hypothesis , a one- way anova experimental design was carried out. 24 senior student of efl participated in a one-way interview test. data analyses revealed that those who were exposed frequently to the lexical items over a week prior to inte...
the study aims to achieve research and testing of hypotheses survey techniques and questionnaires to collect information used. 61 questions in the questionnaire included 15 questions and 46 open questions according to research in the study population, girls and their mothers as the value of different children investment should be. mothers according to the research community benefits from havi...
چکیده : هدف پژوهش حاضر، تعیین نقش واسطهای اعتماد سازمانی در رابطه ی بین عدالت سازمانی و یادگیری سازمانی به روش تحلیل مسیر میباشد. برای این منظور با استفاده از روش نمونه گیری تصادفی ساده 1?0 نفر از کارکنان اداره ورزش و جوانان استان فارس انتخاب و به پرسشنامه های متشکل از ابعاد یادگیری سازمانی، عدالت سازمانی و اعتماد سازمانی پاسخ دادند. نتایج پژوهش به طور کلی نشان داد که رابطه ی عدالت سازمان...
Purpose. To assess the variability of histological parameters medial zone roach (Rutilus rutilus) liver. establish level effect transformed conditions existence on fish physiological status. determine prospect using monitoring data in ichthyological practice to morphofunctional state fish. Methodology. Primary materials were obtained different parts Southern Bug River, which differ their degree...
Formerly, many embryologists believed that the blastema cells in regenerating amphibian tails and limbs arose from a reserve of undifferentiated cells, but since the work of Hertwig (1927) and Butler (1935) few modern investigators would support this view. Others have suggested that blastema cells are of epidermal origin (Godlewski, 1928; Rose, 1948). However, this idea has largely fallen into ...
ADIATION induced dominant effects on viability in mammals are statistically demonstrable (HERTWIG 1938; RUSSELL 1957; RUSSELL and RUSSELL 1958; Cox and WILLHAM 1962). RUSSELL and RUSSELL 1959) emphasized that these effects may well prove to add up to a greater damage in the population than the lethal effects of mutations in homozygous condition. However, very little is known about the rate at w...
Edematous frog larvm are among the commonest types of abnormalities which can be produced by experimental means. When ova of the twoor four-celled stage are placed in solutions of potassium cyanide, acetone, butyric acid, or ethyl alcohol for from 12 to 24 hours, and then subsequently developed in t ap water, an edema, tous condition of the body frequently, though not always, results. Hertwig 1...
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