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Space-charge-limited injection in n+-i-n+ structures fabricated by a focused ion beam (1995)

Hwang, S. W. ; Lezec, H. J. ; Sakamoto, T. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 67 (1995), S. 3159-3161

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Transport characteristics of n+-i-n+ structures fabricated on a GaAs/AlGaAs HEMT wafer are presented. An insulating strip (i) between two-dimensional electron gases (n+) is created by a single line scan of a focused ion beam. At sufficiently large biases, the current–voltage (I–V) characteristics of the n+-i-n+ structures display highly linear increases of the currents as a function of the biases. The observed I–V's are quantitatively explained by the space-charge-limited injection into the insulating region when the bias is large enough for the flatband condition. The charged defect density and the length of the insulating region are obtained from the I–V characteristics. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.115148

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Chromosome analysis by fluorescence in situ hybridization of callus-derived regenerants in Allium cyaneum R. (1998)

Lee, S. H. ; Ryu, J. A. ; Do, G. S. ; [et al.]

Springer

Plant cell reports 18 (1998), S. 209-213

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ISSN: 1432-203X

Keywords: Key words Somaclonal variation ; Allium cyaneum ; Fluorescence in situ hybridization ; Autotetraploid regenerants

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Investigations were performed to confirm the optimal in vitro culture condition for callus induction and plant regeneration, to observe if somoclonal variation occurs among regenerated plants at the ploidy level and to analyse the chromosomal location of 5S and 18S-26S rRNA gene families using fluorescence in situ hybridization in callus-derived plants of Allium cyaneum. High-est callus initiation was achieved with bulb explants cultured on MS medium supplemented with 2,4-D and BAP at 1 mg l–1 each. A total of 195 plants was obtained when using MS medium supplemented with 1 mg l–1 NAA and 5 mg l–1 BAP; about 92% were diploid having 2n=16; 8% showed a variation in ploidy level. Using digoxigenin-labelled 5S rRNA and biotin-labelled 18S-26S rRNA gene probes, we compared the fluorescence in situ hybridization patterns of autotetraploid plants with the A. cyaneum wild type. The 5S rRNA gene sites were detected on the interstitial region in the short arm of chromosome 4 and on the interstitial region in both arms of chromosome 7. The 18S-26S rRNA gene sites were detected on the terminal region of the short arm, including the satellite of chromosome 5, as well as on a part of chromosome B. The chromosomal location of both rRNA genes in regenerated autotetraploid plants corresponded to those of the wild species.