I survey the recent literature on the formation of networks. I provide definitions of network games, a number of examples of models from the literature, and discuss some of what is known about the (in)compatibility of overall societal welfare with individual incentives to form and sever links. JEL Classification Numbers: A14, C71, C72

objective(s): recently we reported that the soybean 15-lipoxygenase (slo) inhibitory activity of pyrimido[4,5-b][l,4]benzothiazines largely depends on the orientation of sulfur atom of thiazine core towards feiii-oh in the active site pocket of the enzyme with subsequent oxidation of sulfur to sulfoxide. in this paper the results of a comparative study on the slo inhibitory activities of the me...

budding is a good method of propagation in the persian walnut (juglans regia l.)., however, success of budding is low due to higher root pressure as well as the presence of phenolic compounds in the xylem sap. this study was conducted to compare various budding methods and cut below budding :union: on two and three-year-old persian walnut under field conditions. the experiment was conducted bas...

the role of nickel as catalyst on the conversion of methane and ethylene in a gas phase flow reactor in the absence of oxygen is studied. in this study, nickel in its different forms is used as catalyst. the role of pressure, flow rate, and temperature on the conversion of feed gases is investigated. the experiments have been carried out in the presence and absence of the catalysts to measure t...

introduction: although bacteria producing biofilm are more resistance to antimicrobial agents, biofilm formation can stimulated by sub-minimal inhibitory concentrations (sub-mics) of some antimicrobial agents. therefore, we designed present study to investigate the  in vitro efficacy of several antibiotics (including ceftazidime, piperacillin, ticarcillin, carbenicillin, aztreonam, meropenem, g...

echinoids fauna are common and distributed in the lower miocene deposits of the bagher abad area, northeast isfahan, central iran.there are six echinoid taxa belonging to the echinoidea class that can be described as: clypeaster intermedius, prinocidaris sp. andspines related to: eucidaris zaemays, stylocidaris polyacantha, spatangoid sp. and prinocidaris sp. bivalves, foraminifers,bryozoans, b...

jurassic deposits are well exposed in the bazehowz area, south west of mashhad city, east alborz, iran. it contains plant macrofossilsbelonging to eighteen species of eleven genera of various orders such as equisetales, filicales, bennettitales, cycadales,corystospermales, caytoniales, ginkgoales and pinales. two biozones were recognized in the type section of bazehowz formation.biozone i is an...

the main task of drilling the formation by the bit is done via scraping, crushing and grinding. discharging the fluid from the bit nozzles is done with high pressure which assists to break the rocks. different parameters affect the bit selection and design for each drilling formation, but the most important one is drillability that depends on hardness of the formation. in this paper, the design...

the qom formation, a series of shales, sandstones and carbonate deposits, is the last transgression of the sea in central iran sedimentary basin. foraminifera are one of the most important and numerous fossil groups present in the qom formation. in this study, the micropaleontology of the qom formation in three measured stratigraphic sections in south and west of tafresh (rakin, band-e-ali nagh...