Exponential indices

The NO dissociation rate constants are summarized in Table HI (50) and are smaller than those seen with NO-metmyoglobin complexes. NP2 and NP3 (A ofr 0.1 s ) release NO approximately 10 times more slowly than NPl and NP4 kofs 2-3 s ) at pH 8.0, and the NO release rate for all nitrophorins decreases as the pH is lowered to 5.0. The NO release curves cannot be fit with a single exponential, indicating two off rates at each pH, as previously noted for both recombinant and insect-derived NPl (46), and which has also been recently reported for recombinant NP2 (145). The biphasic kinetics suggest the presence of slowly interconverting conformations. The values obtained are pH and protein dependent, ranging from 2.6 to 0.05 (Table HI) (50), values that are considerably slower than found for sperm whale metmyoglobin... 

The fluorescence lifetime increases in the order 24,25 ( 26), 28,29,227. In all cases, the fluorescence decays are single exponentials, indicating that no additional species or quenching (besides internal conversion and ISC) deactivation channels exist during the decay. 

The 5Do decay in Eu Y203/ZnO fits well to a single exponential, indicating homogeneous environment around Eu3+ as observed for the core-shell Eu Y203/Al203 nanocomposites. 

It was concluded that the observation of these three exponentials indicated the presence of three kinetically non-interacting, each in itself apparently completely isotropic, monomer populations of PPS or PDS. Lochmuller et al. based-their discussions on the values of the (normalized) amplitudes A. in the triple-exponential monomer decays, and stated that these amplitudes were a direct measure of the three fractions of monomers. 

The fluorescence lifetimes of ER measured in a variety of solvents are summarized in Table 2. The lifetime varies widely from 85 ps in water to 2.05 ns in acetonitrile. In any case the decay follows satisfactorily a single exponential,indicating the absence of any kind of complication in solution. In fact, the... 

The hetero-bischelated complex, [IrCl2,phen) (5,6-mephen)]Cl, displays a non-exponentital luminescence decay curve when excited at 337 nm in ethanol-methanol glass at 77°K (19), Analysis of the decay curves of this complex by a non-linear least squares fit to a function representing the sum of two exponentials indicates that the emission is caused by levels with lifetimes of 65 and 9.5 /msec (20), Both time-resolved spectroscopy and analysis of decay curves as a function of emission wavelength indicate... 

For larger droplets the birefringence is positive and its rise is double-exponential, indicating that two detectable processes are involved in the evolution of the field-induced anisotropy. The relaxation times t/ and of the fast and slow processes are on the order of 10 and 10 /xs, respectively. The creation of the anisotropic structure can, in principle, occur through several possible processes. For the fast relaxation, the most likely possibilities are the following [41] ... 

EXPONENTIALS. An exponential has the form BP, where B is the base and p is the power or exponent. An exponential indicates the number of times the base is used as a factor in multiplication. Eor example, 10 means 10 is to be used as a factor 3 times ... 

The equations and solutions for radioactive decay and shielding attenuation are literally identical in form to equation (1.49) except for a change in variables. The plots of decay and attenuation are negative exponentials indicating a decrease with time and shield thickness, respectively, rather than an increase as was the case with power. 

Upon addition of 1-adamantanol (1-AdOH) as a guest, the fractions of the shorter lifetime forms of 2 and 3 increased, while the fractions of the longer lifetime forms of the hosts decreased (Table 1). These data indicate that the induced-fit conformational change of the chromophore-modified CD occurs in association with the guest accommodation, excluding the chromophore from the inside to the outside of the CD cavity (Fig. 4a). The fact that the fluorescence decay curves of the hosts are still double-exponential indicates that the... 

---