The importance of developing artificial media that can be used in the place of serum for maintaining the life of tissues and organs outside the body hardly needs to be emphasized. Many of the studies for which the organ culture technique 1 was developed, as well as others that can be carried on by the simpler methods of tissue culture, depend for their success on the creation of suitable artifi...

The Apicomplexans are obligate intracellular protozoan parasites and the causative agents of severe diseases in humans and animals. Although complete genome sequences are available since many years and for several parasites, they are replete with putative genes of unassigned function. Forward and reverse genetic approaches are limited only to a few Apicomplexans that can either be propagated in...

gradient of acrylamide (10-16.5%, w/v). The modified polypeptides were detected by fluorography. The reaction-centre polypeptides have been identified on the gels of the whole membranes by comparison with purified reaction centres. Iodination of chromatophores from R. capsulata results in heavy labelling of the H-subunit (Fig. la). In contrast, the Hsubunit of R. sphaeroides is only very weakly...