Abstract. Lake eutrophication ecosystems tend to exhibit bistable kinetics with two preferential configurations of oligotrophic and eutrophic states, and perturbations in the environmental parameters can cause regime shifts between two alternative stable states, yielding catastrophic regime shifts. In this article, we study stochastic kinetics of regime shifts in a time-delayed lake eutrophication ecological system, where the environmental parameters are assumed to be disturbed by both input and loss external noises. The dynamical behavior of stochastic delay on the regime shifts between oligotrophic and eutrophic states is analyzed using numerical simulations. Time delays in loss and recycling processes are considered. It is shown from time series and probability distribution that noises and delays can induce regime shifts between two stable states. Theoretical analyses are used to support our numerical simulations. By using the mean first passage time (MFPT) technique, we also discuss the escape time problem between two stable states in time-delayed ecosystems. A detailed study of the MFPT depending on various noise characteristics is performed, and the main results are compared for different cases of time delays.

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Resonance Raman spectra were obtained for formanilide (FA) in acetonitrile solution with 239.5-and 245.9-nm excitation wavelengths in resonance with the S 3 state, and density functional theory (DFT) was used to elucidate the electronic transitions and resonance Raman spectra of FA. The spectra indicate that, in the Franck-Condon region, photodissociation dynamics has a multidimensional character with the motions mainly along the C O stretching υ 8 , the ring C C stretch υ 9 , the NH wag and ring CCH in-plane bend υ 11 , the NH wag and ring CCH in-plane bend υ 12 , ring C C stretch and ring CCH in-plane bend υ 16 , the NH wag and ring CCH in-plane bend υ 17 , the ring CCH in-plane bend υ 18 , and the ring trigonal bend υ 24 . The excited-state dynamics of the S 3 state is discussed, and the results are compared with those previously reported for benzamide (BA) to examine the Nor C-terminal-substituted aromatic effect of the peptide bond.

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