The New Encyclopaedia Britannica: Suppl, Volume 16Encyclopaedia Britannica, 1997 |
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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 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 ...
Page 601
... atom , often called a dopant , is present in a semiconductor ( which is then designated as doped ) and has a different number of valence electrons from the atom it replaces , extra energy levels can be formed within the band gap . If ...
... atom , often called a dopant , is present in a semiconductor ( which is then designated as doped ) and has a different number of valence electrons from the atom it replaces , extra energy levels can be formed within the band gap . If ...
Contents
CHINA | 36 |
CHINESE LITERATURE | 231 |
CHORDATES CHRISTIANITY | 251 |
Copyright | |
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