ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Photoluminescence dependence on heterointerface for metalorganic chemical vapor deposition grown GaInNAs/GaAs quantum wells (2002)

Kawaguchi, M. ; Miyamoto, T. ; Gouardes, E. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 80 (2002), S. 962-964

add to mindlist on the mindlist

Details

ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We investigate the effect of the sequence of gas flows at heterointerfaces on optical quality of GaInNAs/GaAs quantum wells grown by metalorganic chemical vapor deposition (MOCVD). We point out that the degradation mechanism of photoluminescence of GaInNAs grown by MOCVD method is categorized in two types. One is the formation of a GaNAs layer at the heterointerface which causes both increase of emission wavelength and degradation of crystal quality. The other is generation of nonradiative centers induced by incorporation of nitrogen (N). The insertion of a GaInAs layer to the GaInNAs/GaAs heterointerface is proposed to overcome these degradation mechanisms. A GaInAs intermediate layer is effective to suppress the GaNAs formation and to reduce the total GaInNAs thickness. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1448656

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Butyl Benzyl Phthalate, an Endocrine Disrupter, Inhibits Pulsatile Luteinizing Hormone Secretion Under an Insulin-Induced Hypoglycaemic State in Ovariectomized Rats (2002)

Kawaguchi, M. ; Funabashi, T. ; Aiba, S. ; [et al.]

Oxford, UK : Blackwell Science, Ltd

Journal of neuroendocrinology 14 (2002), S. 0

add to mindlist on the mindlist

Details

ISSN: 1365-2826

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Butyl benzyl phthalate (BBP) and bisphenol A (BPA), termed endocrine disrupters, are known to mimic oestrogen in their actions, and therefore there is concern about their effect on reproductive functions. Since it is reported that the inhibitory action of oestrogen on the pulsatile secretion of luteinizing hormone (LH) is enhanced under insulin-induced hypoglycaemia, whether this also applies to BBP and BPA was examined in the present study. In adult ovariectomized (OVX) rats, the pulsatile LH secretion 24 h after subcutaneous injection of 10 mg BBP (BBP-treated), 10 mg BPA (BPA-treated) or 100 ng 17β-oestradiol (E2-treated), all of which were dissolved in sesame oil, was not changed significantly compared to that after the injection of sesame oil only. Furthermore, in oil-treated OVX rats, the pulsatile LH secretion immediately after intravenous injection of insulin (1.0 U) was not changed compared to that after saline injection. In BBP-treated OVX rats, the injection of insulin (1.0 U) significantly decreased the number of LH pulses as in E2-treated OVX rats. The injection of insulin did not significantly affect the amplitude of LH pulses in BBP-, BPA- and E2-treated OVX rats. The results indicate that the oestrogenic action of BBP is significantly enhanced by insulin-induced hypoglycaemia and thus the pulsatile LH secretion is inhibited. We suggest that weak oestrogenic endocrine disrupters may become harmful to reproductive functions even in adult female rats, if acting under a low energy state.