55 research outputs found
Energy transfer within phycocyanin trimers of Mastigocladus laminosus studied by picosecond time-resolved transient absorption spectroscopy
The transient absorption recovery induced in phycocyanin trimers by picosecond pulses of
variable wavelength (570 — 620 nm) has been recorded and analyzed by applying a least-squares
multi-exponential fit procedure.
The results suggest that in native PC trimers the chromophores exhibit a microheterogeneity
with the effect that the derived apparent lifetimes are functions of excitation and probing wavelength.
It is suggested that, due to strong excitonic coupling between a-84 and Ăź-84
chromophores, the lifetime of the terminal acceptor state is reduced to about 900 ps; the apparent
energy transfer time from chromophore β-155 to a-84 and ß-84 chromophores varies between
20—50 ps depending on the actual chromophore-protein arrangement (microheterogeneity)
Energy transfer in C-phycocyanin in different states of aggregation studied by picosecond time-resolved fluorescence
Picosecond time-resolved polarized emission spectroscopy of biliproteins. Influence of temperature and aggregation
Time-resolved polarized fluorescence of C-phycocyanin and its subunits from Mastigocladus laminosus
Energy transfer in 'native' and chemically modified C-phyocyanin trimers and the constituent subunits
Picosecond time-resolved, polarized fluorescence decay of phycobilisomes and constituent biliproteins isolated from Mastigocladus laminosus
Integration of Multifidelity Multidisciplinary Computer Codes for Design and Analysis of Supersonic Aircraft
This paper documents the development of a conceptual level integrated process for design and analysis of efficient and environmentally acceptable supersonic aircraft. To overcome the technical challenges to achieve this goal, a conceptual design capability which provides users with the ability to examine the integrated solution between all disciplines and facilitates the application of multidiscipline design, analysis, and optimization on a scale greater than previously achieved, is needed. The described capability is both an interactive design environment as well as a high powered optimization system with a unique blend of low, mixed and high-fidelity engineering tools combined together in the software integration framework, ModelCenter. The various modules are described and capabilities of the system are demonstrated. The current limitations and proposed future enhancements are also discussed
Picosecond time-resolved fluorescence of phycobiliproteins
The α- and β-subunits of C-phycocyanin from Mastigocladus laminosus were prepared according to revised procedures. Both subunits are isolated as dimers, which can be dissociated into monomers with detergent mixtures. The fluorescence decay kinetics are similar for the respective monomers and dimers. In no case could they be fitted by only one (α-subunit) or two exponentials (β-subunit) which are predicted by theory for samples with a unique chromophore—protein arrangement containing one and two chromophores, respectively. It is suggested that there exists a heterogeneity among the chromophores of the subunits, which may persist in the highly aggregated complexes present in cyanobacterial antennas
Numerical Construction of LISS Lyapunov Functions under a Small Gain Condition
In the stability analysis of large-scale interconnected systems it is
frequently desirable to be able to determine a decay point of the gain
operator, i.e., a point whose image under the monotone operator is strictly
smaller than the point itself. The set of such decay points plays a crucial
role in checking, in a semi-global fashion, the local input-to-state stability
of an interconnected system and in the numerical construction of a LISS
Lyapunov function. We provide a homotopy algorithm that computes a decay point
of a monotone op- erator. For this purpose we use a fixed point algorithm and
provide a function whose fixed points correspond to decay points of the
monotone operator. The advantage to an earlier algorithm is demonstrated.
Furthermore an example is given which shows how to analyze a given perturbed
interconnected system.Comment: 30 pages, 7 figures, 4 table
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