منابع مشابه
Filaments of Amoeba Proteus
Amoeba proteus has two types of cytoplasmic filaments that are thought to be important in cell motility, cytoplasmic streaming, and changes in cytoplasmic consistency : thin, 50-70 A wide filaments, and short, thick, 160 A wide rods (Pollard and Ito, 1970) . The thin filaments resemble the actin filaments of muscle (Hanson and Lowy, 1963), Acanthamoeba (Weihing and Korn, 1969 ; Pollard et al .,...
متن کاملCytoplasmic Filaments of Amoeba Proteus
The role of filaments in consistency changes and movement in a motile cytoplasmic extract of Amoeba proteus was investigated by correlating light and electron microscopic observations with viscosity measurements. The extract is prepared by the method of Thompson and Wolpert (1963). At 0 degrees C, this extract is nonmotile and similar in structure to ameba cytoplasm, consisting of groundplasm, ...
متن کاملCytoplasmic filaments and cellular wound healing in amoeba proteus
The flexibility and self-healing properties of animal cell surface membranes are well known. These properties have been best exploited in various micrurgical studies on living cells (2, 3), especially in amoebae (7, 20). During nuclear transplantation in amoebae, the hole in the membrane through which a nucleus passes can have a diameter of 20-30 mum, and yet such holes are quickly sealed, alth...
متن کاملOriented thick and thin filaments in amoeba proteus
Actin and myosin filaments as a foundation of contractile systems are well established from ameba to man (3). Wolpert et al. (19) isolated by differential centrifugation from Amoeba proteus a motile fraction composed of filaments which moved upon the addition of ATP. Actin filaments are found in amebas (1, 12, 13) which react with vertebrate heavy meromyosin (HMM), forming arrowhead complexes a...
متن کاملCYTOPLASMIC FILAMENTS OF AMOEBA PROTEUS I. The Role of Filaments in Consistency Changes and Movement
The role of filaments in consistency changes and movement in a motile cytoplasmic extract of Amoeba proteus was investigated by correlating light and electron microscopic observations with viscosity measurements. The extract is prepared by the method of Thompson and Wolpert (1963) . At 0 °C, this extract is nonmotile and similar in structure to ameba cytoplasm, consisting of groundplasm, vesicl...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 1971
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.48.1.216