abstract introduction: scientific development is essential for each type of development. the first step for planning is to know present situation. for planning to improve student role in research, we must know how much do they know about research methodology and what kind of attitude they have about it. the aim of this study was to determine isfahan dental students' knowledge and attitude about...

introduction small and medium-sized enterprises (smes) bring a broad range of benefits beyond growth of national income, providing important opportunities for employment, and are a key source of an outlet for entrepreneurial creativity and ideas. however, it is estimated that smes are responsible around 60 percent of carbon dioxide emissions and 70 percent of all pollution globally. therefore, ...

effects of different levels of ascorbic acid consisting of 0, 100, 200, 400, 800 and 1600 mg/kg feed were examined on some immune variables of juvenile great sturgeon (huso huso) weighing 38 g at water temperature 20°c for 16 weeks. significant difference were observed in level of lysozyme in fish treated 400 and 1600 mg compared with control group 8 week post-treatment (p0.05) 16 weeks post-tr...

bitter asafetida (ferula asa-fetidae l.) is a wild plant of the family umbelliferae. the present study was carried out to determine the type of dormancy of the plant’s seed, and find out the most suitable treatment needed for quick germination of seeds. twelve treatments including ga3 (500, 1000, 1500 ppm), kno3 (0.1, 0.2 0.3 molar), rinsing (24, 48, 72 hour),elimination of seed coat (one year-...

abstract introduction: the mineral content of dentin increases with age and its primary structure is altered. these changes may have unknown effects on efficiency of adhesive systems. the aim of this study was to find the effect of aging on dentin bonding agents. methods and materials: fourty eight extracted human premolars were divided into 2 groups under 15 years old & 2 groups over 45 years ...

global concern of protection of the environment has led to researches on the effects of plants, natural extracts and organic materials to help maintain the postharvest quality of horticultural crops. throughout the present study, the effects of such natural products as: mint, thyme, savory, rosemary extracts, s-carvone, and humic acid on postharvest life of cut rose flowers, and the potential o...

a completely randomized design (crd) with three replications was conducted at greenhouse of urmia university in 2013 to study the effect of different methyl jasmonate concentrations (0, 0.1 and 0.5 mm) on the activity of enzymes polyphenol oxidase, phenylalanine ammonia lyase, catalase, ascorbate peroxidase, guaiacol peroxidase and total protein content in basil. activity of the enzymes and tot...

to examine the effect of mixing graminicide herbicides with liquid fertilizer in gorgan region, an experiment was conducted as factorial arranged in complete randomized block design (rcbd) with three replications at the research farm of islamic azad university of gorgan. the first factor was using topic, pumasuper and axial herbicides with the amounts of 0.8, 1, and 0.5 l/ha-1, respectively. th...

beta-2 adrenoceptors in blood vessels are one of the active factors that play a role in regulation of tissue blood flow. in diabetic angiopathy, responsiveness of these receptors is decreased, while that is increased in inflammation. according to these opposite effects, the aim of this study was to investigate the vasodilatory response of knee joint blood vessels to salbutamol (beta-2 adrenocep...

green roofs are a part of efforts to make the cities more sustainable and it is one of the modern solutions for urban problems. the physical development of cities led to loss of the natural environment. therefore, the development of green spaces plays an important role in human life. in order to evaluate the effect of some culture media on yield of “oenothera speciosa rosea” in green roof situa...