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  • Cytochrome f  (1)
  • Golgi apparatus  (1)
  • Golgi compartments  (1)
  • 1
    ISSN: 1432-2048
    Keywords: ATP synthase ; Cytochrome f ; Immuno-gold labelling ; Light-harvesting chlorophyll a/b protein ; Ribulose 1,5-bisphosphate carboxylase/oxygenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The proteins ribulose 1,5-bisphosphate carboxylase/oxygenase, ATP synthase, light-harvesting chlorophyll a/b protein, and cytochrome f, have been localized in mesophyll chloroplasts of barley (Hordeum vulgare L.) by electron microscopy of immunogold-labelled sections. The light-harvesting chlorophyll a/b protein and cytochrome f are shown to be present in the grana, both within the stacks and at the margins, and in the stromal membranes. Although the absolute amount of labelling for these proteins is greater in the grana than in the stromal membranes, when expressed as label/membrane length the partitioning appears approximately equal between appressed and non-appressed membranes for both the light-harvesting chlorophyll a/b protein and cytochrome f. ATP synthase is restricted to the non-appressed thylakoid membranes, and ribulose 1,5-bisphosphate carboxylase/oxygenase is uniformly distributed through the stromal contents.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Cell wall (glycoprotein) ; Chlamydomonas ; Glycoprotein, hydroxyproline-rich ; Golgi compartments ; O-Glycosidic linkage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A series of monoclonal antibodies and a polyclonal antiserum have been used to investigate the localisation and pathway of biosynthesis of the cell-wall hydroxyproline-rich glycoprotein 2BII in the alga Chlamydomonas reinhardii. Glyco-protein precursors were detected within the endoplasmic reticulum using a polyclonal antiserum raised to the deglycosylated 2BII. Monoclonal antibodies which are known to recognise different carbohydrate epitopes of 2BII were found to label two distinct regions of the Golgi stack. The immunolabelling results demonstrate that there is compartmentation of protein synthesis and glycosylation steps for these O-glycosidically linked glycoproteins. Newly synthesised glycoproteins are transported from the Golgi apparatus to the cell surface via two distinct routes. They then undergo assembly into a cell wall, the inner wall layer being formed first and probably functionaing as a template within which the outer crystalline wall layers are assembled.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 167 (1992), S. 19-32 
    ISSN: 1615-6102
    Keywords: Scales ; Golgi apparatus ; Vacuole ; Calcium ; Vesicle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The unicellular green algal flagellate,Mesostigma viride, is characterized by an extracellular matrix of multiple layers of scales. These scales are processed within the Golgi apparatus (GA). The GA consists of 11–13 closely stacked cisternae. The cis cisternae are highly fenestrated and grow via vesicles from adjacent transition ER. Medial-trans cisternae are plate-like with swollen peripheries. The calcified basket scales are produced in the peripheries of GA cisternae, usually first observable in the medial zone of the cisternal stack. Cisternal membrane closely conforms to the precise architecture of the developing scale. Antimonate labeling reveals that a population of smooth cytoplasmic vacuoles situated near the GA contains a store of calcium, perhaps used for scale processing. Vesicles carry calcium from these vacuoles to the cisternal loci where basket scale ontogenesis is occurring. The smaller scale types are produced within the central areas of the GA. A discussion concerning membrane flow through the GA is provided.
    Type of Medium: Electronic Resource
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