The New Encyclopædia Britannica: The new Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 588
... atom . They contain two more hydrogen atoms than do other porphyrins . The various forms differ in mi- nor modifications of side groups attached to the pyrrole groups . In higher plants , chlorophyll is bound to proteins and lipids ...
... atom . They contain two more hydrogen atoms than do other porphyrins . The various forms differ in mi- nor modifications of side groups attached to the pyrrole groups . In higher plants , chlorophyll is bound to proteins and lipids ...
Page 599
... atoms into high energy states from which they decay back to ground state with the emission of photons . This leads to the red light seen in neon tubes and the yellow and blue light seen in sodium and mercury vapour lamps , respectively ...
... atoms into high energy states from which they decay back to ground state with the emission of photons . This leads to the red light seen in neon tubes and the yellow and blue light seen in sodium and mercury vapour lamps , respectively ...
Page 600
... atoms connected by alter- nating single and double bonds ) . The bonding electrons holding the molecule together can be viewed as belonging to the whole molecule . Simple conjugated chains have electronic transitions that absorb ...
... atoms connected by alter- nating single and double bonds ) . The bonding electrons holding the molecule together can be viewed as belonging to the whole molecule . Simple conjugated chains have electronic transitions that absorb ...
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