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Digitale Medien

Frequency selection and transient dynamics in single-mode lasers with optical feedback (1992)

Hernández-García, E. ; Abraham, N. B. ; San Miguel, M. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 72 (1992), S. 1225-1236

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Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: It is demonstrated that a closed delayed equation for the phase of the electric field can be used to describe accurately the transient switch on of a laser with external feedback when it can be described by field evolution equations. In contrast, it is shown that several more severe approximations to the dynamics, including an adiabatically evolving potential for one-dimensional relaxation dynamics (which had previously been used to accurately predict the laser linewidths for the steady-state solutions) fail to reliably describe the final state selection during transient switch on of the laser, the delay-induced oscillatory approach to the chosen state, and features of the amplitude and frequency spectra near multiples of the external cavity mode spacing which may be important for the stability and switching dynamics of the steady states that correspond to excitation of different external cavity resonances.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.352331

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Digitale Medien

Elimination of Citrus psorosis virus by somatic embryogenesis from stigma and style cultures (2001)

D'Onghia, A. M. ; Carimi, F. ; De Pasquale, F. ; [weitere]

Oxford, UK : Blackwell Science Ltd

Plant pathology 50 (2001), S. 0

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Details

ISSN: 1365-3059

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Somatic embryogenesis was used to eliminate Citrus psorosis virus (CPsV) from three citrus species (common mandarin, sweet orange and Dweet tangor), all of which regenerated somatic embryos with different embryogenic potential from stigma and style explants. CPsV was detected by double antibody sandwich-indirect-enzyme-linked immunosorbent assay (DASI-ELISA) in explants and embryogenic callus, but was not detected in any of the plants obtained from somatic embryos, even 24 months after regeneration. Loss of juvenile characters (disappearance of thorns) was observed in the first year of growth and was retained in plants propagated by grafting from thornless stems. Somatic embryogenesis appears to be a very promising technique for the production of healthy citrus stocks.