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  • Articles  (183)
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  • Analytical Chemistry and Spectroscopy
  • Biology  (183)
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  • Articles  (183)
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  • 1
    Electronic Resource
    Electronic Resource
    An editorial letter of introduction (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 1-1 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010102
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  • 2
    Electronic Resource
    Electronic Resource
    Fluorescence intensity decays of cyclohexane and methylcyclohexane with two-photon excitation from a high repetition rate frequency-doubled dye laser (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 3-8 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: We observed fluorescence emission from cyclohexane (CH) and methylcyclohexane (MCH) using picosecond pulses at 298-300 nm from a frequency-doubled cavity-dumped R6G dye laser. The emission maxima for CH and MCH are 209 and 215 nm, respectively, which agree with previous studies using vacuum ultra-violet (VUV) excitation near 150 nm. The fluorescence intensities depended quadratically on peak laser intensity indicating two-photon excitation. The intensity decays resulting from two-photon excitation were measured using frequency-domain fluorometry and were found to be nearly singly exponential ranging from 0.59 to 0.80 ns. Two-photon induced fluorescence of cyclic and linear alkanes may provide new intrinsic spectroscopic probes of biological molecules. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010103
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  • 3
    Electronic Resource
    Electronic Resource
    FT-IR spectroscopic studies on molecular interactions of cryoprotectant agents with bacteria (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 365-373 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Fourier transform infrared spectroscopy was used to investigate, without any destructive interference, interactions of the cryoprotective agents, glycerol and dimethyl sulfoxide with Bradyrhizobium japonicum. The intracellular spectrum of glycerol, obtained by subtracting the spectrum of control bacteria from that of glycerol-treated bacteria, showed no differences in infrared features compared to that of pure glycerol. This was not the case when dimethyl sulfoxide treatment was used. The intracellular spectrum displayed important modifications compared to that of the pure chemical. Spectral analysis showed that glycerol and dimethyl sulfoxide uptake required only a few minutes. Moreover, the infrared features resulting from the presence of pure glycerol, in bacteria, were still existent for up to 2 or 3 hours after thawing process. The deconvoluted Amide I and Amide II bands of bacterial proteins reflected important changes in secondary structure after treatment of bacteria with dimethyl sulfoxide (increase in β-sheet and loss of random coil content). In contrast to glycerol, the cryoprotective action of dimethyl sulfoxide probably involves interactions with a wide range of intrabacterial species. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010602
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  • 4
    Electronic Resource
    Electronic Resource
    NMR spectroscopy of inclusion complex of sodium diclofenac with β-cyclodextrin in aqueous solution (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 233-239 
    Details
    ISSN: 1075-4261
    Keywords: cyclodextrins ; diclofenac ; inclusion complexes ; chemical shifts ; 1H-NMR spectroscopy ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The interaction between diclofenac (sodium salt of 2-[(2,6-dichlorophenyl)amino]benzeneacetic acid) and β-cyclodextrin in aqueous solution has been investigated by 1H-NMR spectroscopic technique. The technique is based on the shielding of the β-cyclodextrin and drug protons. The spectra showed upfield shifts of the β-cyclodextrin protons in the presence of diclofenac, and the diclofenac protons also shifted upfield in the presence of β-cyclodextrin. The changes in chemical shifts of suitable guest-host protons are consistent with the formation of an inclusion complex diclofenac/β-cyclodextrin. © 1997 John Wiley & Sons, Inc. Biospect 3:233-239, 1997
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    An NMR and vibrational study of 5-bromouridine and its base pairing with guanosine and adenosine (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 241-249 
    Details
    ISSN: 1075-4261
    Keywords: NMR ; vibrational spectroscopy ; 5-bromouridine ; base pairing ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: A multinuclear magnetic resonance and vibrational study on 5-bromouridine and its base pairing with guanosine and adenosine in deuterated dimethyl sulfoxide at different concentrations is reported. A dicarbonylic non-self-associated form is suggested for 5-bromouridine on the basis of the 1H-, 15N-NMR, and Raman data. When guanosine is added in equimolar amounts, a downfield shift of the (N3)H proton of 5-bromouridine and of the (N1)H and NH2 protons of guanosine is observed; these results can be interpreted, according to the Raman ones, considering that only a fraction of guanosine is “wobble base paired” with 5-bromouridine, whereas the remaining part is self-associated. When 5-bromouridine is mixed with adenosine, the proton chemical shift of the aminic NH2 of adenosine increases and the (N3)H iminic of 5-bromouridine moves downfield at a value higher than that observed for the 5-bromouridine-guanosine mixture. This behavior supports the hypothesis that 5-bromouridine interacts more with adenosine than with guanosine, but the results obtained are not able to establish which type of pairing (Watson-Crick or Hoogsteen) is present. Finally, the infrared spectrum of the solid 5-bromouridine: adenosine adduct, for which X-ray measurements of other authors suggested a Hoogsteen pairing, is reported and the observed bands are discussed. © 1997 John Wiley & Sons, Inc. Biospect 3: 241-249, 1997
    Additional Material: 5 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared spectroscopy of human tissue. III. Spectral differences between squamous and columnar tissue and cells from the human cervix (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 253-257 
    Details
    ISSN: 1075-4261
    Keywords: infrared spectroscopy of human tissue ; squamous and glandular cervical epithelium ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Infrared spectra of cervical tissue, obtained by biopsy from the squamous-columnar junction, are reported. The spectral patterns observed for columnar tissue are quite different from those of squamous epithelium. Subsequently, the spectra observed for columnar cells in tissue samples were also detected in the spectra of exfoliated cells, indicating the presence of endocervical cells. The columnar or glandular cells exhibit spectral features similar to those observed for pure cervical mucus. © 1997 John Wiley & Sons, Inc. Biospectroscopy 3: 253-257, 1997
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  • 7
    Electronic Resource
    Electronic Resource
    Predictions of protein secondary structures using factor analysis on Fourier transform infrared spectra: Effect of Fourier self-deconvolution of the amide I and amide II bands (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. 93-106 
    Details
    ISSN: 1075-4261
    Keywords: protein secondary structure ; FTIR spectroscopy ; Fourier self-deconvolution ; factor analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Fourier self-deconvolution (FSD) was performed on protein amide I and II Fourier transform infrared (FTIR) spectra to test if the resultant increased band shape variation would lead to improvements in protein secondary structure prediction with our factor analysis based restricted multiple regression (RMR) methods. FTIR spectra of 23 proteins dissolved in H2O were measured and normalized to a constant amide I peak absorbance. The deconvolved spectra were renormalized by area so that the deconvolved spectra sets had the same area as before. Principal component analysis of the deconvolved spectra sets was carried out, which was followed by a selective multiple linear regression (RMR) analysis of the principal component loadings with regard to the fractional components (FC) of secondary structure. As compared to analyses based on the original spectra set, helix and sheet predictions were not noticeably improved by FSD; but, if a very large number of component spectra (16) were retained in the pool to select which loadings to be used in the RMR optimization, better predictions of turn and “other” resulted. The prediction quality varied depending on the deconvolution parameters used. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: 93-106, 1998
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence for global mobility in the premelting of a polynucleotide from temperature-dependent Raman optical activity (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. 107-111 
    Details
    ISSN: 1075-4261
    Keywords: conformational mobility ; nucleic acid dynamics ; Raman optical activity ; RNA ; temperature dependence ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The backscattered Raman and Raman optical activity (ROA) spectra of poly(rA)-poly(rU) at 20°C and 45°C in buffered aqueous solution between 650 and 1750 cm-1 are reported. Although the intensity of the majority of the Raman bands increase by varying amounts as the temperature is raised in accordance with the well-known hypochromic effect, the reverse effect is found for the ROA signals which we attribute to thermal accessibility of a greater number of distinct conformations leading to cancellation of ROA signals. The difference ROA spectrum obtained by subtracting the spectrum recorded at 45°C from that recorded at 20°C displays a very similar sign pattern to those at both 20°C and 45°C throughout the spectral region examined. This indicates that the same average structure is maintained in this temperature range and that the thermal fluctuations are correlated through the bases, the glycosidic link, the sugar ring, and the phosphate backbone of both strands. These results indicate that ROA may be a useful new probe of the dynamics of nucleic acid in solution. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: 107-111, 1998
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  • 9
    Electronic Resource
    Electronic Resource
    FT-Raman investigation of alkaloids in the liana Ancistrocladus heyneanus (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. 113-120 
    Details
    ISSN: 1075-4261
    Keywords: FT-Raman spectroscopy ; micro-Raman technique ; Ancistrocladus heyneanus ; naphthylisoquinoline alkaloids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The applicability of the micro-FT-Raman technique for studying alkaloids in vitro and for observing alkaloids in plant cells is demonstrated. This technique is examined using fresh plant material of Ancistrocladus heyneanus, a tropical liana known to produce pharmacologically interesting naphthylisoquinoline alkaloids as secondary metabolites. It will be shown that it is possible to localize and identify some of these alkaloids in different parts of the plant by means of Raman microspectroscopic studies. Data on the in situ structure and the spatial distribution can be obtained, which could provide information about the biosynthesis of the alkaloids in the plant. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: 113-120, 1998
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  • 10
    Electronic Resource
    Electronic Resource
    Amphotericin B toxicity as related to the formation of oxidatively modified low-density lipoproteins (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. 135-144 
    Details
    ISSN: 1075-4261
    Keywords: amphotericin B ; low-density lipoprotein ; oxidation ; toxicity ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The effect of amphotericin B on the oxidation and degradation of low- and high-density lipoproteins was investigated by UV-vis spectroscopy, electron microscopy, electrophoresis, and size-exclusion chromatography. Two formulations of the drug were used: the commercial Fungizone and a new, less toxic, liposomal formulation, AmBisome. It was shown that Fungizone strongly enhanced the oxidative deformation of low-density lipoprotein structure while AmBisome did not bind to this lipoprotein fraction and did not affect its oxidation. It was shown that amphotericin B contained in Fungizone extracted cholesterol from low-density lipoproteins which sensitized them to oxidation. Both formulations of amphotericin B studied here did not bind to high-density lipoprotein and did not affect the process of its oxidation. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: 135-144, 1998
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