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Highly sensitive biological and chemical sensors based on reversible fluorescence quenching in a conjugated polymer.
- L. Chen, D. Mcbranch, H. L. Wang, R. Helgeson, F. Wudl, D. Whitten
- Chemistry, BiologyProceedings of the National Academy of Sciences…
- 26 October 1999
It is established that the dramatic quenching results from weak complex formation [polymer(-)/quencher(+)], followed by ultrafast electron transfer from excitations on the entire polymer chain to the quencher, with a time constant of 650 fs.
PHOTOCHEMICAL REACTIONS IN ORGANIZED MONOLAYER ASSEMBLIES. 8. ENVIRONMENTAL EFFECTS ON PHOTOCHEMICAL REACTIONS- CONTRASTS IN THE PHOTOOXIDATION BEHAVIOR OF PROTOPORPHYRIN IX IN SOLUTION, MONOLAYER…
Understanding the dark and light-enhanced bactericidal action of cationic conjugated polyelectrolytes and oligomers.
- Ying Wang, S. Jett, J. Crum, K. Schanze, E. Chi, D. Whitten
- BiologyLangmuir : the ACS journal of surfaces and…
- 15 January 2013
The finding thus show that the antimicrobial polymers and oligomers exert toxicity toward Gram-negative bacteria by disrupting the morphology and structures of cell envelope and cytoplasm, including cellular components such as proteins and DNA, while exert toxicity towards Gram-positive bacteria by binding to and disrupting just the cell wall.
Biocidal activity of a light-absorbing fluorescent conjugated polyelectrolyte.
- Liangde Lu, F. Rininsland, Shannon K Wittenburg, K. Achyuthan, D. Mcbranch, D. Whitten
- Chemistry, BiologyLangmuir : the ACS journal of surfaces and…
- 11 March 2005
It is suggested that a range of conjugated polyelectrolytes in different formulations may provide a useful new class of biocides for both dark and light-activated applications.
Self-sensitized photo-oxidation of protoporphyrin IX and related porphyrins in erythrocyte ghosts and microemulsions: A novel photo-oxidation pathway involving singlet oxygen
Super-helix formation induced by cyanine J-aggregates onto random-coil carboxymethyl amylose as template.
- O. Kim, J. Je, G. Jernigan, L. Buckley, D. Whitten
- BiologyJournal of the American Chemical Society
- 18 January 2006
Binding of the J-aggregates onto the template CMA is sterically controlled by the asymmetric environment of glucose residues so that more twisting power is exerted with increasing DS (of CMA), rendering the cyanine dye/CMA complex a more rigid (a high fluorescence intensity) super-helix.
Mechanisms for the photooxidation of protoporphyrin IX in solution
PHOTOOXIDATION AND SINGLET OXYGEN SENSITIZATION BY PROTOPORPHYRIN IX AND ITS PHOTOOXIDATION PRODUCTS
Protoporphyrin IX and its various ester derivatives have been previously shown to undergo self‐sensitized photooxygenation to yield hydroxyaldehydes (photoprotoporphyrin) and mono‐ and diformyl…
Structural basis for aggregation mode of oligo-p-phenylene ethynylenes with ionic surfactants.
- E. H. Hill, D. Sanchez, Deborah G Evans, D. Whitten
- Chemistry, Materials ScienceLangmuir : the ACS journal of surfaces and…
- 11 December 2013
The structural basis for aggregation effects between molecules based on the p-phenylene ethynylene backbone is revealed, and an understanding of how to influence the aggregation mode of similar compounds is given.