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2.
Virology ; 106(1): 155-8, 1980 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-18631715

RESUMO

Electron microscopy of plastids from mesophyll cells of Malva parviflora infected with the Abutilon mosaic virus revealed elongated "chains of pearls" with subunits of 7.5 nm in diameter. Paracrystalline inclusions of the chains of pearls studied by means of cytochemical techniques gave evidence of the presence of DNA.

10.
Planta ; 114(3): 239-50, 1973 Sep.
Artigo em Alemão | MEDLINE | ID: mdl-24458758

RESUMO

The ultrastructure of the "primary" nucleus of the marine green algae Acetabularia (Polyphysa) cliftonii as revealed by the freeze-etching technique is described.The nuclear envelope is perforated by about 3×10(6) pores which appear arranged nearly in rows. The nucleus is covered with a layer of cytoplasm which protects it in the isolated state and resists various manipulations. This cytoplasmic layer is protected by an elementary membrane. The latter appears rough on the cytoplasmic side, and smooth on the side facing the "cell sap". The cytoplasmic layer and the surrounding perinuclear cytoplasm are connected by cytoplasmic ducts. The nucleus appears irregularly shaped owing to many invaginations in the nuclear envelope. Sometimes mitochondria are observed in these cavities.

12.
Planta ; 91(2): 165-8, 1970 Jun.
Artigo em Alemão | MEDLINE | ID: mdl-24500018

RESUMO

The reserve polysaccharides in chloroplasts of several species of Acetabularia have been identified as starch.The starch granules in situ as well as the isolated and purified particles "stain" with Lugol-reagent. They show the characteristic birefringence.Acid hydrolysis and degradation by α-amylase followed by acid hydrolysis showed that the starch is composed only of glucose units.The statements of Vanden Driessche and Bonotto (1967) concerning the inulin character of the reserve polysaccharides in Acetabularia chloroplasts need correction.

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