Robert M. Dickson
Georgia Institute of Technology
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Publications 95
Fluorescence from the xanthene dyes rose bengal, erythrosine B, eosin Y, and fluorescein is modulated by reversibly optically populating and depopulating their long-lived triplet states through coillumination with a second, long-wavelength laser. Here we show that repumping the S1 state from the triplet generates strong, ns-lived optically activated delayed fluorescence (OADF), s to ms after primary pulsed excitation has passed. This time-delayed emission upon long-wavelength illumination gener...
#1Yen-Cheng Chen (Emory University)H-Index: 3
#2Chetan Sood (Emory University)H-Index: 4
Last. Robert M. Dickson (Georgia Institute of Technology)H-Index: 38
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Live cell fluorescence imaging is the method of choice for studying dynamic processes, such as nuclear transport, vesicular trafficking, and virus entry and egress. However, endogenous cellular autofluorescence masks a useful fluorescence signal, limiting the ability to reliably visualize low-abundance fluorescent proteins. Here, we employed synchronously amplified fluorescence image recovery (SAFIRe), which optically alters ground versus photophysical dark state populations within fluorescent p...
#1Chen He (Furman University)H-Index: 1
#2Peter M. Goodwin (LANL: Los Alamos National Laboratory)H-Index: 29
Last. Jeffrey T. Petty (Furman University)H-Index: 26
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Silver molecules are chromophores with diverse spectra and rich photophysics, and DNA strands act as ligands that develop specific molecular silver species. For example, C4AC4T*C3GT4 selectively yields a Ag106+ fluorophore with λex/λem = 490/550 nm. This single-stranded DNA coordinates and protects the cluster, and its integrity was challenged by breaking the phosphodiester backbone at the innocuous T*. The resulting C4AC4T and C3GT4 fragments also develop the same Ag106+ fluorophore but only wh...
#1George C. SchatzH-Index: 110
#2Anne B. McCoyH-Index: 33
Last. Timothy S. ZwierH-Index: 43
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#1Daniel P. Mahoney (Georgia Institute of Technology)H-Index: 1
#2Aida A. Demissie (Georgia Institute of Technology)H-Index: 1
Last. Robert M. Dickson (Georgia Institute of Technology)H-Index: 38
view all 3 authors...
Merocyanine 540 fluorescence can be enhanced by optically depopulating dark photoisomer states to regenerate the fluorescence-generating manifold of the all-trans isomer. Here, we utilize a competing modulation route, long-wavelength coexcitation of the trans triplet population to not only modulate fluorescence through enhanced ground-state recovery but also generate optically activated delayed fluorescence (OADF) with longer-wavelength co-illumination. Such OADF (∼580 nm) is directly observed w...
1 CitationsSource
#1Yen-Cheng ChenH-Index: 1
#2Chetan SoodH-Index: 4
Last. Gregory B. MelikyanH-Index: 23
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#1Dustin J. E. Huard (Parker H. Petit Institute for Bioengineering & Bioscience)H-Index: 1
#2Aida Demissie (Parker H. Petit Institute for Bioengineering & Bioscience)H-Index: 1
Last. Raquel L. Lieberman (Parker H. Petit Institute for Bioengineering & Bioscience)H-Index: 1
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Multinuclear silver clusters encapsulated by DNA exhibit size-tunable emission spectra and rich photophysics, but their atomic organization is poorly understood. Herein, we describe the structure of one such hybrid chromophore, a green-emitting Ag8 cluster arranged in a Big Dipper-shape bound to the oligonucleotide A2C4. Three 3′ cytosine metallo-base pairs stabilize a parallel A-form-like duplex with a 5′ adenine-rich pocket, which binds a metallic, trapezoidal-shaped Ag5 moiety via Ag–N bonds ...
7 CitationsSource
#1Jeffrey T. Petty (Furman University)H-Index: 26
#2Mainak Ganguly (Furman University)H-Index: 19
Last. Robert M. Dickson (Georgia Institute of Technology)H-Index: 38
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Silver clusters consisting of ∼10 atoms are readily bound by and encapsulated within DNA strands to yield strong absorption and emission. The coordination environments, however, are poorly understood, so cluster adducts can only be empirically tuned. This work describes the C4AC4TC3G strand that templates a particular cluster adduct. Its sequence has three types of nucleobases with distinct roles—tracts of cytosines that collectively coordinate the cluster, thymine acting as a junction in the ov...
2 CitationsSource
#1Tzu-Hsueh HuangH-Index: 2
#2Yih-Ling TzengH-Index: 20
Last. Robert M. DicksonH-Index: 38
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5 CitationsSource