Synthesis of compounds containing the isoprene unit. A new stereoselective synthesis of all-trans vitamin A and of methyl (2E,4E)-3,7,11-trimethyldodeca-2,4-dienoate

1979 ◽  
pp. 1729 ◽  
Author(s):  
Giuliana Cardillo ◽  
Michele Contento ◽  
Sergio Sandri ◽  
Mauro Panunzio
Keyword(s):  
Vitamin A ◽  
Stereoselective Synthesis ◽  
Isoprene Unit

ChemInform Abstract: The Highly Stereoselective Synthesis of all-trans and I3-cis Vitamin A via Double Elimination Reaction.

1986 ◽  
Vol 17 (28) ◽  
Author(s):  
J. OTERA ◽  
H. MISAWA ◽  
T. MANDAI ◽  
T. ONISHI ◽  
S. SUZUKI ◽  
...  
Keyword(s):  
Vitamin A ◽  
Stereoselective Synthesis ◽  
Elimination Reaction

ChemInform Abstract: SYNTHESIS OF COMPOUNDS CONTAINING THE ISOPRENE UNIT, A NEW SYNTHESIS OF VITAMIN A

1973 ◽  
Vol 4 (35) ◽  
pp. no-no
Author(s):  
GIANFRANCO CAINELLI ◽  
GIULIANA CARDILLO ◽  
MICHELE CONTENTO ◽  
PIERO GRASSELLI ◽  
ACHILLE UMANI RONCHI
Keyword(s):  
Vitamin A ◽  
Isoprene Unit ◽  
New Synthesis

The Morphology of Vacuolated Cells in the Liver Following Administration of Vitamin A.

1973 ◽  
Vol 31 ◽  
pp. 408-409
Author(s):  
Odell T. Minick ◽  
Hidejiro Yokoo ◽  
Fawzia Batti
Keyword(s):  
Electron Microscopy ◽  
Body Weight ◽  
Vitamin A ◽  
Light And Electron Microscopy ◽  
Liver Cells ◽  
Prominent Feature ◽  
Vascular Space ◽  
Vacuolated Cell ◽  
Vacuolated Cells ◽  
Vacuolated Cytoplasm

Vacuolated cells in the liver of young rats were studied by light and electron microscopy following the administration of vitamin A (200 units per gram of body weight). Their characteristics were compared with similar cells found in untreated animals.In rats given vitamin A, cells with vacuolated cytoplasm were a prominent feature. These cells were found mostly in a perisinusoidal location, although some appeared to be in between liver cells (Fig. 1). Electron microscopy confirmed their location in Disse's space adjacent to the sinusoid and in recesses between liver cells. Some appeared to be bordering the lumen of the sinusoid, but careful observation usually revealed a tenuous endothelial process separating the vacuolated cell from the vascular space. In appropriate sections, fenestrations in the thin endothelial processes were noted (Fig. 2, arrow).

The Effect of Vitamin A on the Intermittent Nitrogen Dioxide Gas Exposure in Hamsters

1976 ◽  
Vol 34 ◽  
pp. 176-177
Author(s):  
J.C.S. Kim ◽  
M.G. Jourden ◽  
E.S. Carlisle
Keyword(s):  
Electron Microscopy ◽  
Vitamin A ◽  
Nitrogen Dioxide ◽  
Chronic Exposure ◽  
Light And Electron Microscopy ◽  
Specific Effect ◽  
Deficient Diet ◽  
Intermittent Exposure ◽  
Hypovitaminosis A ◽  
Gas Exposure

Chronic exposure to nitrogen dioxide in rodents has shown that injury reaches a maximum after 24 hours, and a reparative adaptive phase follows (1). Damage occurring in the terminal bronchioles and proximal portions of the alveolar ducts in rats has been extensively studied by both light and electron microscopy (1).The present study was undertaken to compare the response of lung tissue to intermittent exposure to 10 ppm of nitrogen dioxide gas for 4 hours per week, while the hamsters were on a vitamin A deficient diet. Ultrastructural observations made from lung tissues obtained from non-gas exposed, hypovitaminosis A animals and gas exposed animals fed a regular commercially prepared diet have been compared to elucidate the specific effect of vitamin A on nitrogen dioxide gas exposure. The interaction occurring between vitamin A and nitrogen dioxide gas has not previously been investigated.

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