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  • 1
    Electronic Resource
    Electronic Resource
    Perpendicular media signal and noise analysis by magnetic force microscopy on written transitions (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4673-4673 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have quantitatively analyzed the signal and noise properties of perpendicular media from magnetic force microscopy images of written transitions. Four sets of Pt/CoCrTa multilayer thin films were prepared under different sputtering conditions to yield virgin media domain sizes ranging from 50 to 5000 nm. The magnetic recording transitions on each disk were written in the frequency range from 2 to 30 MHz, which corresponds to recording densities from 20 to 300 kfci. We performed Fourier analysis on the written and unwritten areas of the media to obtain signal and noise spectra. The media noise and signal-to-noise ratios from these spectra are comparable with those from recording head read-back spectra. These spectra are indicative of the exchange coupling existing in the films and correlate with the synthesis conditions for the various media. By analyzing the unwritten areas in the sample disks, we also obtained the average virgin domain sizes for these four kinds of disks.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365522
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  • 2
    Electronic Resource
    Electronic Resource
    Reduced intergranular magnetic coupling in Pd/Co multilayers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3651-3655 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ideal magnetic switching mechanism for many types of data storage, including hard disk recording, is isolated domain coherent rotation. However, in typical Pd/Co multilayers with high coercivity, the dominant switching mechanism is domain wall motion, which causes noise in the readback signal. We have investigated the addition of elements, such as carbon, into Pd/Co multilayers to reduce the coupling between adjacent magnetic domains. This reduction of magnetic coupling reduces the length scale over which incoherent switching occurs. Kelly–Hankel plots and the switching radius ratio have been used to compare interactions and domain sizes of oxidized and carbon segregated Pd/Co multilayers. Both oxidation and carbon segregation reduce the coupling between domains, but the multilayers nevertheless remain more strongly coupled than perpendicular alloy films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361193
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of Fe nanocrystalline in SiO2 by ion implantation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2527-2529 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a novel method, by using an ion implantation and subsequent heat treatment, to prepare Fe nanocrystalline in SiO2. The formation process of Fe granules was monitored by means of conversion electron Mössbauer spectroscopy and the size of which was determined by transmission electron microscopy. The magnetic coercivity of 100 and 70 Oe have been observed at room temperature and 80 K, respectively. A decrease of the coercivity at 80 K is probably caused by the appearance of a multidomain structure in the granules due to reducing the critical radius of single domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108170
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  • 4
    Electronic Resource
    Electronic Resource
    Arsenic doping of GeSi epitaxial layers grown in the dichlorosilane/germane system (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1676-1678 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter we detail the effects of arsine on Ge1−xSix growth rate and doping. We have observed for the first time that the growth process is no longer well described by a simple first-order reaction. The growth-rate data instead are consistent with a second-order reaction, with a substantial change in the activation energy. The electron carrier concentration and mobility have been measured as functions of arsine flow and compared to similar data from silicon growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108448
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  • 5
    Electronic Resource
    Electronic Resource
    Energy transfer in Sr"0"."5"6Ba"0"."4"4Nb"2O"6:Ce AT 633 nm
    Amsterdam : Elsevier
    Optics Communications 64 (1987), S. 81-84 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(87)90374-9
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  • 6
    Electronic Resource
    Electronic Resource
    Time-resolved extended X-ray absorption fine structure
    Amsterdam : Elsevier
    Nuclear Instruments and Methods In Physics Research 205 (1983), S. 375-377 
    Details
    ISSN: 0167-5087
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-5087(83)90213-2
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  • 7
    Electronic Resource
    Electronic Resource
    The inhibitory properties of avian ovoinhibitors against proteolytic enzymes
    Amsterdam : Elsevier
    BBA - Protein Structure 229 (1971), S. 176-185 
    Details
    ISSN: 0005-2795
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2795(71)90331-X
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  • 8
    Electronic Resource
    Electronic Resource
    Production of testosterone from cholesterol using a single-step microbial transformation of Mycobacterium sp (1997)
    Springer
    Journal of industrial microbiology and biotechnology 19 (1997), S. 269-272 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: testosterone; androst-4-en-3,17-dione; cholesterol; Mycobacterium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel single-step microbial transformation process for the production of testosterone (TS) from cholesterol by Mycobacterium sp was investigated. It was found that the supply of reducing power, NADH, from the metabolism of glucose was necessary for the reduction of androst-4-en-3,17-dione (AD) to TS. The cultivation time for the maximum accumulation of TS and the residual glucose increased in parallel with the amount of glucose supplemented in fermentation cultures. After the glucose in the fermentation culture was completely consumed, most of the TS was oxidized to AD. Adding a larger amount of glucose could prevent oxidation of TS to AD. Under optimal fermentation conditions, the maximum molar conversion rate of TS from cholesterol was 51% in a 5-L surface-aerated fermentor after 120 h cultivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900456
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  • 9
    Electronic Resource
    Electronic Resource
    Expression of the creatininase gene from Pseudomonas putidaRS65 in Escherichia coli (2000)
    Springer
    Journal of industrial microbiology and biotechnology 24 (2000), S. 2-6 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: creatininase; creatinine amidohydrolase; Pseudomonas putida; cloning; DNA sequencing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The gene encoding creatininase from Pseudomonas putida RS65 was cloned, sequenced and expressed in Escherichia coli. One plasmid containing a 7.0-kb HindIII insert was selected by its ability to express creatininase activity. After deletion of the adjacent restriction fragments, a 1.1-kb SphI fragment, which contained the full length of the creatininase gene, was subcloned into a pUC18 vector and the nucleotide sequence of the creatininase gene was determined. The gene consists of 771 base pairs and encodes a protein of 257 amino acids. The constitutive creatininase productivity of E. coli DH5α (pCRN741) cultured in broth was about 8.5-fold higher than that of P. putida RS65 cultured in a creatinine-containing medium. The creatininase gene was expressed efficiently in E. coli from its own promoter. Journal of Industrial Microbiology & Biotechnology (2000) 24, 2–6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900753
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  • 10
    Electronic Resource
    Electronic Resource
    Strain improvement ofArthrobacter simplex by protoplast fusion (1996)
    Springer
    Journal of industrial microbiology and biotechnology 16 (1996), S. 257-260 
    Details
    ISSN: 1476-5535
    Keywords: protoplast fusion ; protoplasting ; cholesterol oxidase ; Arthrobacter simplex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Anl-tryptophan auxotroph and milky mutants were derived from an inducible cholesterol oxidase-producing bacterium,Arthrobacter simplex USA18, via UV-mutagenesis. Protoplasts of these mutants and a constitutive cholesterol oxidase producer, strain US3011, were prepared by growing cells in the presence of ampicillin (20μg ml−1) followed by digestion with lysozyme. Protoplast fusion between tested strains with complementary characteristics was achieved in the presence of 20–40% polyethylene glycol 6000. The fusion frequency was about 1.5–1.7×10−3. The cholesterol oxidase activity of four fusants in a cholesterol-containing medium was 20–60% higher than that of parental strains. This study demonstrated that protoplast fusion is applicable to strain improvement ofArthrobacter strains for enzyme production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570030
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