Abstract:
:The photoreceptor population in Xenopus consists of a green-sensitive rod (lambda(max) = 523 nm), a blue-sensitive rod (lambda(max) = 445 nm) and three classes of cone. The largest cone is red-sensitive (lambda(max) = 611 nm). The intermediate cone is presumed to be blue-sensitive based on physiological criteria, whereas the miniature cone may be UV-sensitive. Horizontal cells (HC) are of two sorts: axon-bearing and axonless. The axon-bearing HC is of the luminosity type and probably contacts all types of photoreceptor. The axonless HC is of the chromaticity type and contacts only intermediate (blue) cones and at least one type of rod. During development dendrites of HCs and bipolar neurons penetrate photoreceptor bases. A progressive maturation of HC and bipolar synapses with rods and cones occurs between tadpoles stages 37/8 and 46. Neighboring rods and cones are joined by gap junctions. During this same period, the outer segments are laid down and photopigments synthesized. A linear relation was found between the quantum capturing ability of the rod and its absolute threshold. Mature rods of the Xenopus retina release glutamate in a calcium-dependent manner. Glutamate release was found to be a linear function of calcium influx through L-type calcium channels. Both types of HC possess ionotropic glutamate receptors of the AMPA subtype.
journal_name
Microsc Res Techjournal_title
Microscopy research and techniqueauthors
Witkovsky Pdoi
10.1002/1097-0029(20000901)50:5<338::AID-JEMT3>3.0keywords:
subject
Has Abstractpub_date
2000-09-01 00:00:00pages
338-46issue
5eissn
1059-910Xissn
1097-0029pii
10.1002/1097-0029(20000901)50:5<338::AID-JEMT3>3.0journal_volume
50pub_type
杂志文章,评审abstract::The ultrastructure of adult human articular cartilage matrix is reexamined in tissue processed according to recently improved cryotechniques [Studer et al. (1995) J. Microsc., 179:321-332]. In truely vitrified tissue, a network of fine cross-banded filaments (10-15 nm in diameter) with a periodicity characteristic of ...
journal_title:Microscopy research and technique
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更新日期:1993-05-01 00:00:00
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更新日期:1992-03-01 00:00:00
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更新日期:2012-04-01 00:00:00
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更新日期:2006-04-01 00:00:00
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journal_title:Microscopy research and technique
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更新日期:2014-09-01 00:00:00
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journal_title:Microscopy research and technique
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更新日期:2012-03-01 00:00:00
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journal_title:Microscopy research and technique
pub_type: 杂志文章
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更新日期:1997-02-15 00:00:00
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更新日期:2009-12-01 00:00:00
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journal_title:Microscopy research and technique
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更新日期:1999-02-15 00:00:00
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journal_title:Microscopy research and technique
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更新日期:2013-01-01 00:00:00
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更新日期:2018-12-01 00:00:00
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journal_title:Microscopy research and technique
pub_type: 杂志文章
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更新日期:2011-04-01 00:00:00
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journal_title:Microscopy research and technique
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更新日期:2020-09-01 00:00:00
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journal_title:Microscopy research and technique
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abstract::Transgenic mice are valuable experimental models of human endocrine diseases. Targeted ablation of specific cell lineages or insertion of genes coding for releasing factors, hormones, growth factors, and oncogenes fused with appropriate promoters, or mutated genes, can induce several pituitary disorders. Various hypos...
journal_title:Microscopy research and technique
pub_type: 杂志文章,评审
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更新日期:1997-10-15 00:00:00
abstract::Morphological studies of the microcirculatory system in the thymus were reviewed in regards to methodology and structural organization of blood and lymphatic vessels. The blood capillaries and postcapillary venules (PCVs) in the thymus are characterized by a double-walled structure. These vessels are surrounded more o...
journal_title:Microscopy research and technique
pub_type: 杂志文章
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更新日期:1997-08-01 00:00:00