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  • Life Sciences (General)  (2)
  • 39-356; 39-357; 72-516F; 74-525A; 74-527; 74-528; 74-529; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg39; Leg72; Leg74; South Atlantic; South Atlantic/CONT RISE; South Atlantic/CREST; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/SLOPE  (1)
  • 04. Solid Earth::04.03. Geodesy::04.03.05. Gravity variations
  • F22
  • J24
  • 1990-1994  (3)
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Year
  • 1
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    Effects of spaceflight in the adductor longus muscle of rats flown in the Soviet Biosatellite COSMOS 2044. A study employing neural cell adhesion molecule (N-CAM) immunocytochemistry and conventional morphological techniques (light and electron microscopy) (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The effects of spaceflight upon the "slow" muscle adductor longus were examined in rats flown in the Soviet Biosatellite COSMOS 2044. The techniques employed included standard methods for light microscopy, neural cell adhesion molecule (N-CAM) immunocytochemistry and electron microscopy. Light microscopic observations revealed myofiber atrophy and segmental necrosis accompanied by cellular infiltrates composed of macrophages, leukocytes and mononuclear cells. Neural cell adhesion molecule immunoreactivity (N-CAM-IR) was seen on the myofiber surface and in regenerating myofibers. Ultrastructural alterations included Z band streaming, disorganization of myofibrillar architecture, sarcoplasmic degradation, extensive segmental necrosis with apparent preservation of the basement membrane, degenerative phenomena of the capillary endothelium and cellular invasion of necrotic areas. Regenerating myofibers were identified by the presence of increased amounts of ribosomal aggregates and chains of polyribosomes associated with myofilaments. The principal electron microscopic changes of the neuromuscular junctions showed axon terminals with a decrease or absence of synaptic vesicles replaced by microtubules and neurofilaments, degeneration of axon terminals, vacant axonal spaces and changes suggestive of axonal sprouting. The present observations suggest that alterations such as myofibrillar disruption and necrosis, muscle regeneration and denervation and synaptic remodeling at the level of the neuromuscular junction may take place during spaceflight.
    Keywords: Life Sciences (General)
    Type: Journal of neuropathology and experimental neurology (ISSN 0022-3069); Volume 51; 4; 415-31
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Glutamine synthetase immunoreactivity is present in oligodendroglia of various regions of the central nervous system (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Glutamine synthetase immunoreactive oligodendrocytes were identified in the cerebral cortex, cerebellum, brain stem, and spinal cord. They were mostly confined to the gray matter, particularly close to neurons and processes. The white matter showed few immunoreactive oligodendroglia. It was suggested that some type of oligodendrocytes, specially those in perineuronal location, might fulfill a functional role more akin to astrocytes than to the normally myelinating oligodendroglia.
    Keywords: Life Sciences (General)
    Type: Glia (ISSN 0894-1491); 3; 5; 335-41
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Sequential variation of carbonate cycles in South Atlantic DSDP locations (1990)
    PANGAEA
    In:  Supplement to: Herbert, Timothy D; d'Hondt, Steven L (1990): Precessional climate cyclicity in Late Cretaceous-Early Tertiary marine sediments: a high resolution chronometer of Cretaceous-Tertiary boundary events. Earth and Planetary Science Letters, 99(3), 263-275, https://doi.org/10.1016/0012-821X(90)90115-E
    Details
    Publication Date: 2024-01-06
    Description: We report well-dated Late Cretaceous and Early Tertiary precessional climatic cycles, recorded by rhythmic carbonate maxima and minima in South Atlantic deep sea sites. Spectral analyses of digitized sediment color, a suitable carbonate proxy, show prominent regularities in the spacing marl-carbonate beds. Magnetostratigraphic dating over a number of magnetic chrons constrains the duration of the cycles, which can be detected over at least 20 Myr of sedimentation at 7 coring locations. Their mean absolute period of 23.5 +/- 4.4kyr agrees closely with the predicted late Cretaceous precessional period of 20.8 kyr. Because they can be matched to a physical forcing mechanism with a known repeat time, the cycles offer a new high-resolution tool to measure rates of climate change before and after the Cretaceous-Tertiary (K/T) boundary. From counts of carbonate cycles, we derive the position of the K/T boundary within C29R at 350 kyr after the base of the reversal. The constancy of cycle thickness (linearly related to sedimentation rate) and amplitude up to the “boundary clay” does not give evidence for climate instability preceding the boundary. Orbital chronometry records a step-function decrease in sediment accumulation rate at the Cretaceous-Tertiary boundary that is consistent with a geologically instantaneous event.
    Keywords: 39-356; 39-357; 72-516F; 74-525A; 74-527; 74-528; 74-529; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg39; Leg72; Leg74; South Atlantic; South Atlantic/CONT RISE; South Atlantic/CREST; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/SLOPE
    Type: Dataset
    Format: application/zip, 7 datasets
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    DATA PANGAEA
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