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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
30/10/2013 |
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Autoria: |
ASAHINA, E.; SHIMADA, K.; HISADA, Y. |
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Título: |
A stable state of frozen protoplasm with invisible intracellular ice crystals obtained by rapid cooling. |
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Ano de publicação: |
1970 |
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Fonte/Imprenta: |
Experimental Cell Research, New York, v. 59, n. 3, p. 349-358, 1970. |
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Idioma: |
Inglês |
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Conteúdo: |
Very rapidly frozen tumor cells can survive intracellular freezing. The cells thus frozen appear to be as translucent as intact unfrozen ones. In the present paper the behavior of rapidly frozen tumor cells is described at various temperatures above ?30°C using MTK sarcoma III, an ascites sarcoma of rat. Translucent frozen tumor cells were obtained by cooling the cells rapidly (cooling rate: 13–30°C/ sec) to temperatures between ?18°C and ?30°C. The results presented in this paper suggest that the frozen cells have many intracellular fine ice crystals which are too small to interfere with the ordinary transmitted light. These cells can survive freezing as long as they remain translucent in apparance, and can resume normal growth in the peritoneal cavity of rat, provided that they are thawed very rapidly (thawing rate: 60–120°C/sec). However such a living state of frozen protoplasm becomes unstable with increasing temperatures, as a result of recrystallization or a further development of fine ice crystals formed within the protoplasm. The recrystallization of ice in rapidly frozen tumor cells proceeds with difficulty at about ?30°C, and very easily at temperatures above ?20°C. |
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Thesagro: |
Protoplasma. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01682naa a2200157 a 4500
001 1829828
005 2013-10-30
008 1970 bl --- 0-- u #d
100 1 $aASAHINA, E.
245 $aA stable state of frozen protoplasm with invisible intracellular ice crystals obtained by rapid cooling.
260 $c1970
520 $aVery rapidly frozen tumor cells can survive intracellular freezing. The cells thus frozen appear to be as translucent as intact unfrozen ones. In the present paper the behavior of rapidly frozen tumor cells is described at various temperatures above ?30°C using MTK sarcoma III, an ascites sarcoma of rat. Translucent frozen tumor cells were obtained by cooling the cells rapidly (cooling rate: 13–30°C/ sec) to temperatures between ?18°C and ?30°C. The results presented in this paper suggest that the frozen cells have many intracellular fine ice crystals which are too small to interfere with the ordinary transmitted light. These cells can survive freezing as long as they remain translucent in apparance, and can resume normal growth in the peritoneal cavity of rat, provided that they are thawed very rapidly (thawing rate: 60–120°C/sec). However such a living state of frozen protoplasm becomes unstable with increasing temperatures, as a result of recrystallization or a further development of fine ice crystals formed within the protoplasm. The recrystallization of ice in rapidly frozen tumor cells proceeds with difficulty at about ?30°C, and very easily at temperatures above ?20°C.
650 $aProtoplasma
700 1 $aSHIMADA, K.
700 1 $aHISADA, Y.
773 $tExperimental Cell Research, New York$gv. 59, n. 3, p. 349-358, 1970.
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| 7. |  | MACHADO, A. de P. S.; PEREIRA, F. de M.; FOGACA, F. H. dos S.; MONTEIRO, F. das C.; CAMARA, J. A. da S.; TEIXEIRA NETO, M. L.; ARAUJO NETO, P. R. de; SOBREIRA, R. dos S.; OLIVEIRA, V. Q. de. Diagnóstico socioeconômico-cultural e ambiental dos municípios do projeto Boa Esperança (Parte final). Teresina: Embrapa Meio-Norte, 2013. 71 p. (Embrapa Meio-Norte. Documentos, 224)| Biblioteca(s): Embrapa Meio-Norte. |
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