A Biochemical Phylogeny of the Protists by Mark A. Ragan

By Mark A. Ragan

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50-56 Storck and Alexopoulos, 1970 30-60 Storck and 1970 Storck and 1970 Storck and 1970 Storck and 1970 Moniliales Cryptococcaceae Candida spp. ) Cryptococcus Rhodotomla spp. )'' spp. )'' Torulopsis spp. 2 DNA: Structure and Composition 35 TABLE 1 (Continued) GC ratio Organism (%) Trichosporon spp. ) Moniliaceae Aspergiflus spp. ) Paecilomyces spp. ) Penicillium spp. ) Crithidia spp. ) Leishmania spp. ) Schizotrypanum cruzi Trichomonas spp. ) Trypanosoma spp. , 1971 Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970 Mandel, 1967; Tuan and Chang, 1975 Mandel, 1967 Mandel, 1967 Shapiro, 1968 Mandel, 1967 Mandel, 1968 Mandel, 1967; Marzzoco and Colli, 1974 Mandel, 1967 Mandel, 1967 Mandel, 1967 36 4 Nucleic Acids TABLE 1 (Continued) GC ratio (%) Organism Ciliatea Actinosphaerium nucleofilum Blepharisma americanum Colpidium spp.

5 R N A Molecular Weights S e d i m e n t a t i o n coefficients of R N A m o l e c u l e s in g r a d i e n t s of c e s i u m c h l o r i d e o r s u c r o s e h a v e b e e n used t o i n d i c a t e t h e i r m o l e c u l a r w e i g h t s . I n t u r n , t h e s e m o l e c u l a r w e i g h t s h a v e b e e n e x a m i n e d for i n f o r m a t i o n c o n c e r n ing p h y l o g e n y . T h e b a s i s of t h e p h y l o g e n e t i c s i g n i f i c a n c e of m o l e c u l a r w e i g h t s is, h o w e v e r , u n c l e a r .

50 60-68 Chlorella spp. ) 43-79 Chlorogonium elongatum Cladophora sp. Dunaliella spp. ) Hydrodictyon reticulatum 54 47 50 54- 61 Lagerheimia ciliata Polytoma spp. ) Polytomella papillata Rhizoclonium japonic um Scenedesmus spp. ) 60 42--65 41 54 52-■64 Spirogyra sp. , 1967; Biswas and Sarkar, 1970 " Space does not allow even a representative sample of bacteria and actinomycetes to be included in this table. Reported DNA GC ratios for prokaryotes other than those listed here range from 23% for some Mycoplasmatales (Freundt, 1974) to 74% for some Streptomyces spp.

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