Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 43 , Issue 2
Showing 1-30 articles out of 30 articles from the selected issue
Highlight Review
  • Yuichiro Kashiyama, Hitoshi Tamiaki
    2014 Volume 43 Issue 2 Pages 148-156
    Published: February 05, 2014
    Released: February 05, 2014
    [Advance publication] Released: November 27, 2013
    JOURNALS FREE ACCESS
    The phototoxic effects of chlorophylls on the cells of organisms have been debated for decades. The extreme phototoxicity of uncontrolled chlorophylls and the concomitant need for rapid elimination of chlorophylls in cells have again attracted attention since the robust processes of higher plants for their catabolism during senescence have been clarified (e.g., autumnal tints). Recently, another type of chlorophyll catabolism has been identified in aquatic microbes that digest algae. Both of these processes involve the detoxification of chlorophylls: the former degrading them into colorless compounds in multiple steps and the latter rapidly converting them into colored but nonphotosensitive molecules. In this paper, we describe various ways that organisms circumvent the phototoxicity of chlorophylls, emphasizing the costs of the adaptive mechanisms against this risk to biological processes.
    Higher plants are known to catabolize their chlorophylls during senescence (e.g., autumnal tints) by a rather complex, robust catabolic pathway to generate colorless and nonphototoxic molecules. Recently, another type of chlorophyll catabolism has been identified in aquatic microbes that digest algae, where chlorophylls are rapidly converted into colored but nonphotosensitive (hence nonphototoxic) molecules. Focusing on costs paid for the catabolic process and risks entailed by the phototoxicity, the latter represents a rate-emphasizing detoxification of chlorophylls, whereas the former represents a quality-emphasizing one. Fullsize Image
     
  • Jean-Louis H. A. Duprey, James H. R. Tucker
    2014 Volume 43 Issue 2 Pages 157-163
    Published: February 05, 2014
    Released: February 05, 2014
    [Advance publication] Released: November 28, 2013
    JOURNALS FREE ACCESS
    This review summarizes the field of bioorganometallic nucleic acid chemistry, with a specific focus on various synthetic approaches for utilizing organometallic groups, in particular ferrocene, as functional tags for existing nucleic acids or as components for novel nucleic acid analogues.
     
  • Takeaki Iwamoto, Shintaro Ishida
    2014 Volume 43 Issue 2 Pages 164-170
    Published: February 05, 2014
    Released: February 05, 2014
    JOURNALS FREE ACCESS
    In the last decade, several stable silicon compounds with nonclassical inverted geometry around silicon atoms have been synthesized. Their unusual structures, bonding, and reactivity have been investigated extensively by X-ray analysis, spectroscopy, and theoretical calculations. In this highlight review, recent progress on chemistry of silicon compounds with inverted geometry around silicon atoms is summarized.
    In the last decade, several stable silicon compounds with nonclassical inverted geometry around silicon atoms are synthesized. Their unusual structures, bondings, and reactivity are investigated extensively by X-ray analysis, spectroscopy, and theoretical calculations. In this highlight review, recent progress on chemistry of the silicon compounds with inverted geometry around silicon atoms is summarized. Fullsize Image
     
  • Bernd M. Schmidt, Dieter Lentz
    2014 Volume 43 Issue 2 Pages 171-177
    Published: February 05, 2014
    Released: February 05, 2014
    [Advance publication] Released: December 10, 2013
    JOURNALS FREE ACCESS
    This review provides an overview on recent advances in the novel field of electron-poor buckybowls. Whereas buckybowl chemistry has now been studied for more than two decades, only recent developments have drawn attention to this type of compound. The syntheses of these buckybowls and their distinct and characteristic properties are described.
    This review provides an overview on recent advances in the novel field of electron-poor buckybowls. Whereas buckybowl chemistry is now studied for more than two decades, only recent developments have drawn attention to this type of compounds. The syntheses of these buckybowls and their distinct and characteristic properties are described. Fullsize Image
     
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