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The incubation experiments using in situ water samples show , however , that in both cases photosynthesis can be enhanced by addition of trace elements ( e.g ., Fe and Cu ) . Clinically , smallpox is a morphologically monomorphous illness that occurs after an incubation period of 12-14 days . After an incubation period of one to two weeks , there is a rapid onset of fever , severe headache and extreme prostration . Viruses are the suspected cause of acute gastroenteritis when vomiting is prominent , when the incubation period is longer than 14 hours , and when the entire illness is over in less than 3 days . In Fe-replete areas ( > 1 nM ) , bacterial production and growth rates in glucose plus Fe treatments were similar to those incubations receiving only glucose . The incubation period for hepatitis B is relatively long ; six weeks to six months may elapse between exposure and the onset of clinical symptoms . P.vivax may have an incubation period of up to 10 months . As virtual reality further insinuates itself into our forms of discourse and modes of representation , and given its similarity to the aesthetic and epistemological incubators of the fascist and pre-fascist periods , we must ask ourselves whether this , too , is an incubation of fascism . Narrowing the focus , consider one of the incubations discussed by two of the authors with respect to film and aesthetics ; namely , the manipulation of film audiences into thinking they themselves were creating images projected from origins that were becoming less and less visible . [ 1 ] Yet the present article purports to underline the importance of epistemological studies for that inquiry , because I believe that the incubations of fascism in Japan cannot be fully understood without taking into account the epistemological schema that staged and arranged Japanese discursive formation and made it possible for Japan to become a totalitarian state similar to its fascist contemporaries . The xTractor buffer in the column lyses the cells during an incubation and mixing step while the TALON resin binds the polyhistidine-tagged proteins . DIN accumulation in the incubation water was detected for all the species , but no significant DIN concentration changes were detected in the control experiments ( seawater alone ) . The incubation period is 3 to 6 days .