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  • 1
    Electronic Resource
    Electronic Resource
    Electron field emission from SiC/Si heterostructures synthesized by carbon implantation using a metal vapor vacuum arc ion source (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1926-1928 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A remarkably low turn-on field of about 1 V/μm has been observed in electron field emission from planar SiC/Si heterostructures formed by high dose C implantation into Si using a metal vapor vacuum arc ion source. An implant energy of 35 keV was used to a dose of 1.0×1018 ions/cm2 with subsequent annealing in nitrogen at 1200 °C for 2 h. X-ray photoelectron spectroscopy showed that a thin surface stoichiometric SiC layer, with a thickness of about 150 nm, had been formed. Atomic force microscopy showed that there are densely distributed small protrusions formed on the surface. The formation of a thin surface stoichiometric SiC layer and the formation of densely distributed small protrusions on the surface are believed to be the two factors responsible for the efficient electron field emission.© 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121229
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic domain structures of Co22Ag78 granular films observed by magnetic force microscopy (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2472-2474 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magnetic force microscope (MFM) was used to image the topography and magnetic microstructures of Co22Ag78 granular films. The observed morphology shows isolated nanometer-scale cobalt particles (granules) embedded in the silver matrix. Stripe magnetic domains with much larger size (typically of ∼100 nm wide) than that of cobalt particles are resolved clearly on MFM micrographs for the annealed samples. It is demonstrated that the domain width and the relative magnetic force strength first increases and then decreases with annealing temperature with a maximum at about 600 K. We suggest that the appearance of the stripe domains is attributed to magnetic correlation among many of the isolated single-domain cobalt particles and is dependent on the microstructure of the samples. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121393
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of a Bi4Ti3O12 buffer layer on SrBi2Ta2O9 thin films prepared by the metalorganic decomposition (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3711-3713 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferroelectric SrBi2Ta2O9 thin films have been deposited on the Bi4Ti3O12 buffered Pt/Ti/SiO2/Si substrates using the metalorganic decomposition technique at annealing temperatures ranging from 600 to 750 °C. No pyrochlore phase was found in the SrBi2Ta2O9 thin films although the Bi2Ti2O7 phase appeared in the Bi4Ti3O12 buffer layers. A SrBi2Ta2O9 film with (200) predominant orientation was formed at 650 °C. The effects of the Bi4Ti3O12 buffer layer and post-annealing temperature on the structure, surface morphology, and electrical properties of SrBi2Ta2O9 thin films were analyzed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123229
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: "Structure control and characterization of SrBi2Ta2O9 thin films by a modified annealing method" [Appl. Phys. Lett. 74, 1221 (1999)] (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2151-2151 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124947
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  • 5
    Electronic Resource
    Electronic Resource
    Structure control and characterization of SrBi2Ta2O9 thin films by a modified annealing method (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1221-1223 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SrBi2Ta2O9 (SBT) ferroelectric thin films were prepared by metalorganic decomposition on Pt/Ti/SiO2/Si substrates at annealing temperatures ranging from 600 to 750 °C. The SBT thin films were annealed layer by layer during the spin-coating process using a rapid thermal annealing (RTA) furnace. The relative intensity of (200) peak in x-ray diffraction increased with the increase of the annealing temperature. A (200)-predominant film can be formed at 700 and 750 °C. For the film annealed by RTA furnace at 650 °C, the remanent polarization (2Pr) and coercive field (2Ec) were 19.8 μC/cm2 and 116 kV/cm, respectively. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123505
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  • 6
    Electronic Resource
    Electronic Resource
    Conservation of S-locus for self-incompatibility in Brassica napus (L.) and Brassica oleracea (L.) (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 73-82 
    Details
    ISSN: 1432-2242
    Keywords: Key words Self-incompatibility ; Brassica oleracea ; Brassica napus ; RFLP ; PCR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Self-incompatibility (SI) in Brassica is a sporophytic system, genetically determined by alleles at the S-locus, which prevents self-fertilization and encourages outbreeding. This system occurs naturally in diploid Brassica species but is introduced into amphidiploid Brassica species by interspecific breeding, so that in both cases there is a potential for yield increase due to heterosis and the combination of desirable characteristics from both parental lines. Using a polymerase chain reaction (PCR) based analysis specific for the alleles of the SLG (S-locus glycoprotein gene) located on the S-locus, we genetically mapped the S-locus of B. oleracea for SI using a F2 population from a cross between a rapid-cycling B. oleracea line (CrGC-85) and a cabbage line (86-16-5). The linkage map contained both RFLP (restriction fragment length polymorphism) and RAPD (random amplified polymorphic DNA) markers. Similarly, the S-loci were mapped in B. napus using two different crosses (91-SN-5263×87-DHS-002; 90-DHW-1855-4×87-DHS-002) where the common male parent was self-compatible, while the S-alleles introgressed in the two different SI female parents had not been characterized. The linkage group with the S-locus in B. oleracea showed remarkable homology to the corresponding linkage group in B. napus except that in the latter there was an additional locus present, which might have been introgressed from B. rapa. The S-allele in the rapid-cycling Brassica was identified as the S29 allele, the S-allele of the cabbage was the S 5 allele. These same alleles were present in our two B. napus SI lines, but there was evidence that it might not be the active or major SI allele that caused self-incompatibility in these two B. napus crosses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050534
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  • 7
    Electronic Resource
    Electronic Resource
    A RFLP-based linkage map of mustard [Brassica juncea (L.) Czern. and Coss.] (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 841-851 
    Details
    ISSN: 1432-2242
    Keywords: Key wordsBrassica juncea ; Mustard ; Linkage ; map ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A genetic linkage map of Brassica juncea was constructed based on restriction fragment length polymorphism (RFLP) detected by anonymous cDNA markers from B. napus, using a segregating F1-derived doubled haploid (DH) progeny from a cross between a canola-quality mustard line (J90-4317) and a high-oil-content mustard line (J90-2733). The RFLP probes consisted of 229 cDNA probes from B. napus and a B. napus tandem repeat sequence, RDA2. The map consisted of 343 marker loci arranged in 18 major linkage groups plus five small segments with two to five marker loci, covering a total map distance of 2073 cM. Twenty-four percent of the markers were dominant in nature. Sixty-two percent of the marker loci were duplicated, and the majority were involved in inter-linkage group duplications, illustrating that complex duplications and subsequent rearrangements occurred after allopolyploidy. Deviation from the Mendelian segregation ratio for a DH population was observed for 27% of the markers. Two-thirds of these markers with a skewed segregation were clustered in 6 linkage groups and two unassigned segments. The overall average marker interval of the B. juncea map reported here was 6.6 cM, which would provide a marker density satisfactory for efficient use of the map in breeding applications, such as tagging of important agronomic traits and marker-assisted selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050485
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  • 8
    Electronic Resource
    Electronic Resource
    Characterisation of the radish introgression carrying the Rfo restorer gene for the Ogu-INRA cytoplasmic male sterility in rapeseed (Brassica napus L.) (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 129-134 
    Details
    ISSN: 1432-2242
    Keywords: Key words Brassica napus ; Raphanus sativus ; Restorer gene ; Introgression ; RFLP ; RAPD ; Genetic mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Bulked segregant analysis and comparative mapping were applied to identify molecular markers linked to the Rfo restorer gene used for the Ogu-INRA cytoplasmic male-sterility system in rapeseed. These markers were then used to localise the radish introgression on the B. napus genetic map constructed from the cross ‘Darmor.bzh’ x ’Yudal’. The introgression mapped on the DY15 linkage group. From the comparison of this latter group to the linkage group constructed on a F2 progeny segregating for the radish introgression, it was concluded that the introgression had occurred through homoeologous recombination, that it was not distal and that it had replaced a B. napus region of around 50 cM. A QTL involved in aliphatic seed glucosinolate content was located on the DY15 linkage group at a position corresponding to one end of the introgression. The DNA markers identified in this study are being used in map-based cloning of the Rfo gene and in marker-assisted selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050876
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of the genetic maps of Brassica napus and Brassica oleracea (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 569-582 
    Details
    ISSN: 1432-2242
    Keywords: Key words Brassica napus ; Brassica oleracea ; Genetic maps ; RFLP ; RAPD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The genus Brassica consists of several hundreds of diploid and amphidiploid species. Most of the diploid species have eight, nine or ten pairs of chromosomes, known respectively as the B, C, and A genomes. Genetic maps were constructed for both B. napus and B. oleracea using mostly RFLP and RAPD markers. For the B. napus linkage map, 274 RFLPs, 66 RAPDs, and two STS loci were arranged in 19 major linkage groups and ten smaller unassigned segments, covering a genetic distance of 2125 cM. A genetic map of B. oleracea was constructed using the same set of RFLP probes and RAPD primers. The B. oleracea map consisted of 270 RFLPs, 31 RAPDs, one STS, three SCARs, one phenotypic and four isozyme marker loci, arranged into nine major linkage groups and four smaller unassigned segments, covering a genetic distance of 1606 cM. Comparison of the B. napus and B. oleracea linkage maps showed that eight out of nine B. oleracea linkage groups were conserved in the B. napus map. There were also regions in the B. oleracea map showing homoeologies with more than one linkage group in the B. napus map. These results provided molecular evidence for B. oleracea, or a closely related 2n=18 Brassica species, as the C-genome progenitor, and also reflected on the homoeology between the A and C genomes in B. napus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050453
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  • 10
    Electronic Resource
    Electronic Resource
    Electron microscopic studies onNosema mesnili Paillot (Microsporidia: Nosematidae) infecting the Malpighian tubules ofPieris canidia larva (1995)
    Springer
    Protoplasma 186 (1995), S. 142-148 
    Details
    ISSN: 1615-6102
    Keywords: Pieris canidia ; Nosema mesnili ; Microsporidia ; Lepidoptera ; Pieridae ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ultrastructure of a microsporidiumNosema mesnili found in the Malpighian tubules ofPieris canidia is described. The life cycle includes meronts, sporonts, sporoblasts, and spores, with typical diplokaryon in each stage. The first two stages are amorphous forms with the former having a thinner cell wall. The spore has 11 coils of the polar filament. This protozoan is a chronic pathogen to its insect host and might have potential as a biological control agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281324
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