Stereocontrolled synthesis of vitamin A through a double elimination reaction. A novel convergent C10 + C10 route

1986 ◽  
Vol 51 (20) ◽  
pp. 3834-3838 ◽  
Author(s):  
Junzo Otera ◽  
Hiromitsu Misawa ◽  
Takashi Onishi ◽  
Shigeaki Suzuki ◽  
Yoshiji Fujita
Keyword(s):  
Vitamin A ◽  
Elimination Reaction ◽  
Stereocontrolled Synthesis

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

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.

An Evaluation of the Isotopic Iodotriolein Method; its Correlation With Vitamin a Absorption

1958 ◽  
Vol 35 (4) ◽  
pp. 381-386 ◽  
Author(s):  
Sidney M. Fierst ◽  
Saul M. Feldman ◽  
Nathan Solomon ◽  
Abraham Lanosam
Keyword(s):  
Vitamin A

Critical Levels of Mineral Oil Affecting the Absorption of Vitamin A

1952 ◽  
Vol 20 (4) ◽  
pp. 587-594 ◽  
Author(s):  
Frederick Steigmann ◽  
Hans Popper ◽  
Hattie Dyniewicz ◽  
Irene Maxwell
Keyword(s):  
Vitamin A ◽  
Mineral Oil ◽  
Critical Levels

Comparative Absorption of Various Types of Vitamin A Preparations

1950 ◽  
Vol 34 (2) ◽  
pp. 413-424 ◽  
Author(s):  
J.M. Lewis ◽  
Sidney Q. Cohlan
Keyword(s):  
Vitamin A
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