A5038953017- Spectroscopy and Quantum Chemical Studies
- Photosynthetic Processes and Mechanisms
- Photoreceptor and optogenetics research
- Photochemistry and Electron Transfer Studies
- Carcinogens and Genotoxicity Assessment
- DNA and Nucleic Acid Chemistry
- Microfluidic and Capillary Electrophoresis Applications
- Analytical Chemistry and Chromatography
- Glass properties and applications
- Material Dynamics and Properties
- Electrochemical Analysis and Applications
- DNA Repair Mechanisms
- Advanced Chemical Physics Studies
- Phase-change materials and chalcogenides
- Advanced biosensing and bioanalysis techniques
- Mass Spectrometry Techniques and Applications
- Molecular Junctions and Nanostructures
- Light effects on plants
- Estrogen and related hormone effects
- Synthesis and Biological Evaluation
- Toxic Organic Pollutants Impact
- Molecular spectroscopy and chirality
- Analytical Chemistry and Sensors
- Effects and risks of endocrine disrupting chemicals
- Quantum Dots Synthesis And Properties
Kansas State University
2014-2024
Vilnius University
2015
Gdańsk University of Technology
1978-2013
University of Minnesota
2007-2011
Rutgers, The State University of New Jersey
2011
Western University
2011
Pennsylvania State University
2011
Ames National Laboratory
1998-2010
National Renewable Energy Laboratory
1999-2010
Concordia University
2006-2010
The fabrication and evaluation of the analytical performance integrated microfluidic MEMS modified with electrochemically deposited metal nanoparticles are described in this paper. is a hydride system that comprise two layers, poly-dimethylsiloxane (PDMS) glass, which turn enclose micro channels network set 15 electrodes, respectively. mechanism electrokinetic phenomenon electrochemical detection were applied for performing injection separation, sensing components biochemical mixture,...
We provide a critical assessment of typical phonon spectral densities, J(ω), used to describe linear and nonlinear optical spectra in photosynthetic complexes. Evaluation is based on more careful comparison experiment than has been provided the past. J(ω) describes frequency-dependent coupling system bath an important component calculations excitation energy transfer times. On basis shape experimental obtained for several complexes, we argue that strongly depends pigment-protein complex....
The magnitude and temperature dependence of most the properties amorphous solids are anomalous at very low temperatures (≲ 1 Kelvin). Phonon-assisted tunneling a distribution glassy bistable configurations, or two-level systems, can account for these anomalies. A unified understanding low-temperature is required an state. Persistent nonphotochemical hole burning impurity optical transitions allows glass state to be produced that thermally inaccessible preburn state, probing dynamics on time...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification and quantitation of benzo[a]pyrene-DNA adducts formed in mouse skinEleanor G. Rogan, Prabhakar D. Devanesan, N. V. S. RamaKrishna, Sheila Higginbotham, Padmavathi, Kimberly Chapman, Ercole L. Cavalieri, Hyuk Jeong, Ryszard Jankowiak, Gerald J. SmallCite this: Chem. Res. Toxicol. 1993, 6, 3, 356–363Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransient and persistent hole burning of the reaction center photosystem IIRyszard Jankowiak, Deming Tang, Gerald J. Small, Michael SeibertCite this: Phys. Chem. 1989, 93, 4, 1649–1654Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.org/doi/10.1021/j100341a090https://doi.org/10.1021/j100341a090research-articleACS PublicationsRequest reuse permissionsArticle...
This paper reports expanded analyses of benzo[a]pyrene (BP)−DNA adducts formed in vitro by activation with horseradish peroxidase (HRP) or 3-methylcholanthrene-induced rat liver microsomes and vivo mouse skin. The BP are compared to those BP-7,8-dihydrodiol anti-BP diol epoxide (BPDE). First, HRP produced 61% depurinating adducts: 7-(benzo[a]pyrene-6-yl)guanine (BP-6-N7Gua), BP-6-C8Gua, BP-6-N7Ade, the newly identified BP-6-N3Ade. As a standard, last adduct was synthesized along BP-6-N1Ade...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonexponential hole burning kinetics in organic glassesR. Jankowiak, R. Richert, and H. BaesslerCite this: J. Phys. Chem. 1985, 89, 21, 4569–4574Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Published inissue 1 October 1985https://doi.org/10.1021/j100267a031RIGHTS & PERMISSIONSArticle Views91Altmetric-Citations90LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcited-state structure and energy-transfer dynamics of two different preparations the reaction center photosystem II: a hole-burning studyD. Tang, R. Jankowiak, M. Seibert, C. F. Yocum, G. J. SmallCite this: Phys. Chem. 1990, 94, 17, 6519–6522Publication Date (Print):August 1, 1990Publication History Published online1 May 2002Published inissue 1 August...
One- and two-color pump/probe femtosecond hole-burning data are reported for the isolated B800−850 (LH2) antenna complex of Rhodopseudomonas acidophila (strain 10050). The profiles interpretable in terms essentially monophasic B800→B850 energy transfer with kinetics ranging from 1.6 to 1.1 ps between 19 130 K excitation at or red B800 absorption maximum. zero-phonon hole obtained 4.2 burn frequencies located near this maximum yielded a time 1.8 ps. (4.2 K) also chromatophores ambient...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification and quantitation of benzo[a]pyrene-DNA adducts formed by rat liver microsomes in vitroP. D. Devanesan, N. V. S. RamaKrishna, R. Todorovic, E. G. Rogan, L. Cavalieri, H. Jeong, Jankowiak, J. SmallCite this: Chem. Res. Toxicol. 1992, 5, 2, 302–309Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March...
The cyclic (Cn) light harvesting 2 (LH2 or B800−850) complexes of Rps. acidophila (strain 10 050) and Rb. sphaeroides, isolated under identical conditions, are compared using the title spectroscopies. Thermal broadening shifting data for B850 absorption band reveal a structural change near 150 K both species in glycerol:water solvent used. linear regions thermal above below this temperature shown to be consistent with dephasing via phonon-assisted relaxation between ring's exciton levels,...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification and Quantitation of Dibenzo[a,l]pyrene-DNA Adducts Formed by Rat Liver Microsomes in Vitro: Preponderance Depurinating AdductsK.-M. Li, R. Todorovic, E. G. Rogan, L. Cavalieri, F. Ariese, M. Suh, Jankowiak, J. SmallCite this: Biochemistry 1995, 34, 25, 8043–8049Publication Date (Print):January 27, 1995Publication History Published online1 May 2002Published inissue 27 January...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrimary donor state mode structure and energy transfer in bacterial reaction centersS. G. Johnson, D. Tang, R. Jankowiak, J. M. Hayes, Gerald Small, TiedeCite this: Phys. Chem. 1990, 94, 15, 5849–5855Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 July 1990https://pubs.acs.org/doi/10.1021/j100378a045https://doi.org/10.1021/j100378a045research-articleACS PublicationsRequest reuse...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption spectroscopy of amorphous tetraceneR. Jankowiak, K. D. Rockwitz, and H. BaesslerCite this: J. Phys. Chem. 1983, 87, 4, 552–557Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue 1 February 1983https://pubs.acs.org/doi/10.1021/j100227a008https://doi.org/10.1021/j100227a008research-articleACS PublicationsRequest reuse permissionsArticle Views744Altmetric-Citations68LEARN ABOUT THESE...
Abstract Photosystem I coordinates more than 90 chlorophylls in its core antenna while achieving near perfect quantum efficiency. Low energy (also known as red chlorophylls) residing the are important for transfer dynamics and yield, however, their precise location remained elusive. Here, we construct a chimeric complex Synechocystis PCC 6803 that shows enhanced absorption spectral region. We combine Cryo-EM spectroscopy to determine structure − function relationship this red-shifted...
Nonphotochemical hole burning and pressure-dependent absorption hole-burning results are presented for the isolated (disaggregated) chlorophyll a/b light-harvesting II trimer antenna complex of green plants. Analysis 4.2 K burn-fluence dependent spectra zero-phonon action indicates that three lowest energy states (Qy) lie at 677.1, 678.4 679.8 nm. Their combined intensity is equivalent to Chl a molecules. The inhomogeneous broadening their bands 70 cm-1. It argued these states, separated by...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification and quantitation of 7,12-dimethylbenz[a]anthracene-DNA adducts formed in mouse skinPrabhakar D. Devanesan, N. V. S. RamaKrishna, Padmavathi, Sheila Higginbotham, Eleanor G. Rogan, Ercole L. Cavalieri, Glenn A. Marsch, Ryszard Jankowiak, Gerald J. SmallCite this: Chem. Res. Toxicol. 1993, 6, 3, 364–371Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of metabolic activation the potent carcinogen 7,12-dimethylbenz[a]anthraceneN. V. S. RamaKrishna, P. D. Devanesan, E. G. Rogan, L. Cavalieri, H. Jeong, R. Jankowiak, and J. SmallCite this: Chem. Res. Toxicol. 1992, 5, 2, 220–226Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pubs.acs.org/doi/10.1021/tx00026a011https://doi.org/10.1021/tx00026a011research-articleACS...
Endogenous 5-methylcytosine (MeC) residues are found at all CG dinucleotides of the p53 tumor suppressor gene, including mutational 'hotspots' for smoking induced lung cancer. MeC enhances reactivity its base paired guanine towards carcinogenic diolepoxide metabolites polycyclic aromatic hydrocarbons (PAH) present in cigarette smoke. In study, structural basis these effects was investigated using a series unnatural nucleoside analogs and representative PAH diolepoxide, benzo[a]pyrene (BPDE)....
The Fenna-Matthews-Olson (FMO) trimer (composed of identical subunits) from the green sulfur bacterium Chlorobaculum tepidum is an important protein model system to study exciton dynamics and excitation energy transfer (EET) in photosynthetic complexes. In addition, FMO a popular for excitonic calculations, with many theoretical parameter sets reported describing different linear nonlinear optical spectra. Due fast relaxation within each subunit, intermonomer EET results predominantly lowest...