The New Encyclopædia Britannica: The new Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 378
... molecules are taken in either by their direct diffusion through the cell wall or by the formation by the surface membrane of vacuoles that carry some of the environ- mental fluid containing dissolved molecules . Within the cell ...
... molecules are taken in either by their direct diffusion through the cell wall or by the formation by the surface membrane of vacuoles that carry some of the environ- mental fluid containing dissolved molecules . Within the cell ...
Page 600
... MOLECULAR ORBITALS Organic compounds . All dyes and most pigments , whether natural or synthetic , are complex organic ... molecules allows them to penetrate into hair easily . Organic dyes occur widely in the plant and animal king- doms ...
... MOLECULAR ORBITALS Organic compounds . All dyes and most pigments , whether natural or synthetic , are complex organic ... molecules allows them to penetrate into hair easily . Organic dyes occur widely in the plant and animal king- doms ...
Page 773
... molecular cloud becomes stars in one crossing time of the molecular cloud ( about 5,000 , - 000 years ) . Low efficiency of star formation presumably explains why any interstellar gas remains in the Galaxy after 1010 years of evolution ...
... molecular cloud becomes stars in one crossing time of the molecular cloud ( about 5,000 , - 000 years ) . Low efficiency of star formation presumably explains why any interstellar gas remains in the Galaxy after 1010 years of evolution ...
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