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  • Springer  (38)
  • American Association for the Advancement of Science (AAAS)  (2)
  • 2000-2004  (10)
  • 1995-1999  (30)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Optically-Pumped Far-Infrared Laser Lines of Methanol Isotopomers: 12CH3OH, 12CH3OD, and 12CH2DOH (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 731-737 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OH ; 12CH3OD ; 12CH2DOH ; new far-infrared laser lines ; optically-pumped far-infrared laser ; laser frequencies ; relative intensity ; relative polarization ; pump-frequency offset
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-seven new far-infrared laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically-pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2-m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026408509524
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  • 12
    Electronic Resource
    Electronic Resource
    Laser Lines and Frequency Measurements of Fully Deuterated Isotopomers of Methanol (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 465-473 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OD ; 13CD3OD ; fully deuterated isotopomers ; new laser lines ; far-infrared laser ; frequency measurement ; CO2 laser pump
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fully deuterated isotopomers of methanol (12CD3OD and 13CD3OD) were optically pumped with a CO2 laser. Five new far-infrared laser lines were discovered in 12CD3OD and 25 in 13CD3OD in the range 43.697 to 719.426 μm. The frequencies of these new and some previously reported laser lines, the pump offset, the relative polarization, the relative intensity, and the optimum pressure of operation were measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022511827416
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  • 13
    Electronic Resource
    Electronic Resource
    New Far-Infrared Laser Lines and Frequency Measurements of Acetaldehyde and Vinyl Fluoride (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 719-726 
    Details
    ISSN: 1572-9559
    Keywords: far-infrared laser ; frequency measurement ; acetaldehyde (CH3CHO) ; vinyl fluoride (CH2CHF) ; cw CO2 laser ; new lines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Eight far-infrared laser lines have been obtained by optically pumping acetaldehyde (CH3CHO) and nine by pumping vinyl fluoride (CH2CHF) with a cw CO2 laser. The far-infrared laser structure used a metal-dielectric waveguide cavity. This is the first reported observation of four of the laser lines in acetaldehyde. In this work, we measure the frequency, optimum pressure of operation, relative intensity, relative polarization, and pump offset from CO2 laser-line center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022646225018
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  • 14
    Electronic Resource
    Electronic Resource
    New Optically Pumped FIR Laser Lines and Frequency Measurements from CH3OD (1999)
    Springer
    International journal of infrared and millimeter waves 20 (1999), S. 741-758 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This work reports the discovery of 45 new optically pumped far-infrared (FIR) laser lines from CH3OD in the range 42.6 μm to 207.2 μm. A highly efficient CO2 laser was used as the pump laser for an Optically-pumped Fabry-Perot FIR laser. The frequencies of most of the new lines were measured in the range 1.7 to 6.4 THz. Twenty-eight CO2 lines were used as pump lines; nineteen of these had frequencies lower than those previously used to pump CH3OD in a FIR laser. Sixteen of the new FIR lines had absorption transitions which belong to the OD bending vibrational mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021753613395
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  • 15
    Electronic Resource
    Electronic Resource
    New FIR Laser Lines and Frequency Measurements of CD3OD (1999)
    Springer
    International journal of infrared and millimeter waves 20 (1999), S. 1631-1645 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The isotopomer of methanol, CD3OD, was optically pumped by a cw CO2 laser resulting in 53 new far-infrared (FIR) laser lines. The wavelengths are in the range 42.9 μm to 189.9 μm with the majority below 100 μm. Ten different CO2 lines were used for the first time to pump CD3OD yielding new FIR laser lines. Some of the CO2 pump lines belong to the hot-bands and sequence-bands of CO2 in the 10 μm region. The frequency was measured for 40 FIR laser lines in the range 1.5 THz to 6.9 THz, 32 of which were new laser lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021738704734
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  • 16
    Electronic Resource
    Electronic Resource
    Optical Properties and Dimer Formation in Copper Phthalocyanine-Doped Sol-Gel Matrices (1998)
    Springer
    Journal of sol gel science and technology 11 (1998), S. 241-250 
    Details
    ISSN: 1573-4846
    Keywords: copper phthalocyanine ; dimer ; monomer ; optical absorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dimer formation in sol-gel matrices was studied using optical absorption spectroscopy of copper phthalocyanine tetrasulfonate dopants in silicate and aluminosilicate sol-gel matrices. Changes in the optical absorption spectra of dimers and monomers were correlated with various stages of the sol-gel process. Dimerization is strongly influenced by the chemistry of the pore liquid. The primary factors that control dimerization are the quantity of solvent remaining in the pores, pore solvent alcohol/water ratio, and presence of protons which can be either from the catalyst or from silanol groups on the silicate pore surfaces. Synthesis conditions which cause dye protonation invariably lead to dimerization during the latter stages of drying when the pore liquid becomes water-rich and there is a high dye concentration. These studies also identify chemical conditions which are able to avoid dye protonation and subsequently reduce dimer formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008602111839
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  • 17
    Electronic Resource
    Electronic Resource
    Encapsulation of the ferritin protein in sol-gel derived silica glasses (1996)
    Springer
    Journal of sol gel science and technology 7 (1996), S. 109-116 
    Details
    ISSN: 1573-4846
    Keywords: ferritin ; sol-gel ; magnetism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A significant recent development in sol-gel science has been the encapsulation of biomolecules such as proteins and enzymes in optically transparent silica glasses. This paper reports on the encapsulation of an iron (Fe) storage protein, ferritin, to develop a magnetic silica glass. Native ferritin, which has a nanometer-sized microcrystalline Fe oxide core, was encapsulated in optically transparent silica glasses using the sol-gel process. Fe could be released from ferritin but could not be reconstituted into apoferritin when the protein was trapped in the pores of the glass. Transmission electron microscopy of ferritin-doped aged silica gels indicated that crystallinity of the Fe oxide core was retained upon sol-gel encapsulation. Magnetic measurements on ferritin-doped silica gels indicated the material to be paramagnetic, but not superparamagnetic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401890
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  • 18
    Electronic Resource
    Electronic Resource
    Enzymatic activity of oxalate oxidase and kinetic measurements by optical methods in transparent sol-gel monoliths (1996)
    Springer
    Journal of sol gel science and technology 7 (1996), S. 117-121 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel monoliths ; immobilized enzyme ; oxalate oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Novel synthetic techniques are used for the encapsulation of the enzymes oxalate oxidase and peroxidase in stable, optically transparent porous silica glass matrices. The large enzymes are fully immobilized in the porous glass but small molecules such as oxalate ions pass readily through the pores in the glass. The enzymes catalyze the reactions leading to the formation of a colored dye product. Upon exposure of the doped glass to oxalate solutions, a colored glass is formed. The absorption spectrum of the colored product and the changes of absorbance with time are measured within the glass matrix. The sensitivity and the time-dependence of the response are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401891
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  • 19
    Electronic Resource
    Electronic Resource
    Encapsulation of Proteins in Bulk and Thin Film Sol-Gel Matrices (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 629-634 
    Details
    ISSN: 1573-4846
    Keywords: protein encapsulation ; absorption spectroscopy ; thin films ; cytochrome c
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper considers the nature of the interactions between the sol-gel derived inorganic matrix and a specific biomolecule, cytochrome c. Optical absorption and impedance spectroscopies are used to characterize the influence of synthesis conditions on the protein's stability and conformation within the silica matrix. In some instances, encapsulation within the sol-gel matrix provides stabilization. For example, protein denaturation is reversible and aggregation is prevented. Moreover, the drying process does not negatively affect the protein; it is possible to regenerate the aged gel state by rehydration. The flexibility of the sol-gel process enables high quality cytochrome c-doped SiO2 thin films to be prepared. These films possess the characteristic reactivity and chemical function of cytochrome c in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018316108875
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  • 20
    Electronic Resource
    Electronic Resource
    Spectroscopic Determination of Cholinesterase Activity and Inhibition in Sol-Gel Media (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1067-1070 
    Details
    ISSN: 1573-4846
    Keywords: cholinesterase ; sol-gel ; pesticide ; THA ; enzyme activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Biological activity of cholinesterases can be determined by optically monitoring the enzymatic reaction with indophenyl acetate, (N-4′-acetoxyphenyl)-4-quinone imine. At pH 8.0 cholinesterases hydrolyze this yellow dye to yield a blue reaction product. Cholinesterase inhibitors reduce the rate of this hydrolysis. Thus, by monitoring absorbance of the hydrolysis product at its maximum (630 nm) as a function of time, reaction rates of both cholinesterase activity and cholinesterase inhibition may be quantified spectroscopically. Using this technique, we measured the enzymatic activity of butyrylcholinesterase (BuChE) molecules encapsulated in tetramethyl orthosilicate (TMOS) silicate gel-glass prepared by hydrolysis and condensation. This activity is reduced, in a concentration-dependent manner, by the reversible cholinesterase inhibitors 1,5-bis(4-allyldimethyl-ammoniumphenyl) pentan- 3-one dibromide (BADAPP) and 9-amino-1,2,3,4-tetrahydroacridine (THA; tacrine, Cognex). The gel-glasses are rigid and compact, transparent, and porous enough to allow reagents to diffuse in and out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018350828807
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