. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. "CHROMIDIA" HYPOTHESIS REVIVED 303. Figure 3. Vacuolated cytoplasm of Paratetramitus jugosus; vacuoles may contain either chromatin bodies (c) or bacterial remains (b). A. Swollen vacuole contains coated chromatin body (c); four other vacuoles (v) probably contain bacterial food remnants. Mitochondria (m), not in vacuoles, are distinguish- able from chromatin bodies. The [9(2) + 2] axoneme of two undulipodia (u), here and in B, suggest these organisms are mastigotesfneg. 1120). B. Bacterial spore (S) in one vacuole
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. "CHROMIDIA" HYPOTHESIS REVIVED 303. Figure 3. Vacuolated cytoplasm of Paratetramitus jugosus; vacuoles may contain either chromatin bodies (c) or bacterial remains (b). A. Swollen vacuole contains coated chromatin body (c); four other vacuoles (v) probably contain bacterial food remnants. Mitochondria (m), not in vacuoles, are distinguish- able from chromatin bodies. The [9(2) + 2] axoneme of two undulipodia (u), here and in B, suggest these organisms are mastigotesfneg. 1120). B. Bacterial spore (S) in one vacuole and remains (b) in another with a chromatin body (c) apparently in the process of release (neg. 2155). C. Bacterial remains (b) and mem- brane-coated chromatin body in large peripheral vacuoles (v) (neg. 1261). All bars = 1 nm. other protoctists (such as certain vahlkampfiids and Ara- chniila) produce and release chromidia. That multiple fission, which usually occurs within cysts, can take place entirely independently of encysta- tion was amply demonstrated in Entamocba histolytica by Cleveland and Saunders (10); their "chromatoid bod- ies," thought to be phosphorus reserves, deserve, like ch- romidia, re-evaluation in a modern context. Multiple fission, which has long been known in other protoctists. notably suctorian and chonotrich ciliates (11, 12), was recently seen in large Trichosphaerium-tike marine amoebae which feed on brown algae (, Sargassum: ref. 13). These studies with live amoebae demonstrate that electron microscopy and molecular biology enor- mously aid in the interpretation of live material but can never supplant it. Anoxia may select for rapid propagule production; chromidia formation seems to be more prevalent than standard amoeba promitosis under conditions of low ambient oxygen as suggested by Wherry (4). Observa- tions of live amoebomastigotes, grown under controlled oxygen concentrations, must be further correlated with their fine structure
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
