The problem of cultural-historical typology is one of the most intriguing issues at the crossroads of psychology and cultural theory. This paper presents a preliminary sketch of the fourlevel-cognitive-development theory to look at this issue from a new perspective. According to the model suggested, three cultural types are marked out: prehistoric and hunter-gatherer culture, early theoretical ...

Background The aim of this study was to establish a cell-free sequential culture system that can support high levels of in vitro embryo development and blastocyst formation from bovine zygotes. To this end, this investigation was carried out to evaluate the effects of glucose, serum and EDTA on bovine zygote in vitro development. MaterialsAndMethods Bovine presumptive zygotes were derived from ...

In this study, three criteria and 10 sub-criteria and 18 indicators based on the ecological, economic and social characteristics of the Alborz province, while reviewing the internal and external resources, and using 30 expert opinions were sought in order to reach a collective consensus. Also to measure their weight, the FAHP fuzzy hierarchy process was used. Then, using weighted linear combina...

Mammalian cell culture media used for the manufacture of therapeutic protein have advanced systematically from serum-containing into animal-free, protein-free and chemically defined formulations over the past decades. Initially driven by patient safety concerns associated with the use of animal-derived medium components, and later by inconsistent cell culture performance due to variability in p...

background: one of the necessities of industrial societies is the application of developed measures/strategies for the prevention of occupational incidents in industrial companies. the present study was conducted with the aim of determining the role of the safety management system on safety culture of an oil and gas exploration and production company. materials and methods: this study was condu...

Innovation is the key to growth, without it, most organization would forever be stuck doing the same old things the same old way. New products, new services and new ways of doing business would never emerge. Entrepreneurship activities brings about business innovation with resultant development in enterprises which also serves as a panacea to economic growth in developing countries. Entreprene...

background: developmental activities especially the establishment of more than 20 industrial units in semnan province caused the officers worries about increased concentration of heavy metals in drinking water supplies and probably increasing of health risk at consumers. the aim of the study was to investigate the effect of semnan province industrial development on the health risk level caused ...