101
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Chaudhari U, Umansky S, Diem M, Bradley M, Acculto L, Cuozzo G, Madrid A, Cody R, Cosgrove N, Barone J, Lacy C, Kostis J. Effect of mental stress and nitroglycerin on vascular compliance in human volunteers. J Am Coll Cardiol 1998. [DOI: 10.1016/s0735-1097(98)80349-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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102
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Chiriboga L, Xie P, Yee H, Zarou D, Zakim D, Diem M. Infrared spectroscopy of human tissue. IV. Detection of dysplastic and neoplastic changes of human cervical tissue via infrared microscopy. Cell Mol Biol (Noisy-le-grand) 1998; 44:219-29. [PMID: 9551653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Infrared absorption spectra of formalin-fixed, paraffin-embedded human cervical tissue are reported for normal, dysplastic and neoplastic samples. The spectral differences found in this study between these states of the tissues are far less than those observed for single cells by us and others. Nevertheless, we find a direct correspondence between spectral data from tissue sections, obtained from biopsies, and individual exfoliated cells, typically obtained during a pap procedure. We also find that spectra due to dysplastic samples fall about halfway between the spectral features of normal and cancerous samples.
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Affiliation(s)
- L Chiriboga
- InPhoCyte, Inc., White Plains, NY 10601, USA
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103
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Chiriboga L, Xie P, Vigorita V, Zarou D, Zakim D, Diem M. Infrared spectroscopy of human tissue. II. A comparative study of spectra of biopsies of cervical squamous epithelium and of exfoliated cervical cells. ACTA ACUST UNITED AC 1998. [DOI: 10.1002/(sici)1520-6343(1998)4:1<55::aid-bspy6>3.0.co;2-r] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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104
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Chiriboga L, Xie P, Yee H, Vigorita V, Zarou D, Zakim D, Diem M. Infrared spectroscopy of human tissue. I. Differentiation and maturation of epithelial cells in the human cervix. ACTA ACUST UNITED AC 1998. [DOI: 10.1002/(sici)1520-6343(1998)4:1<47::aid-bspy5>3.0.co;2-p] [Citation(s) in RCA: 151] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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105
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Chiriboga L, Xie P, Zhang W, Diem M. Infrared spectroscopy of human tissue. III. Spectral differences between squamous and columnar tissue and cells from the human cervix. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/(sici)1520-6343(1997)3:4<253::aid-bspy1>3.0.co;2-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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106
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Landolt M, Diem M. [What is your diagnosis? Proctalgia fugax]. Praxis (Bern 1994) 1995; 84:1087-1088. [PMID: 7481313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Affiliation(s)
- M Landolt
- Medizinische Klinik, Kantonsspital Zug
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107
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Birke SS, Diem M. Conformational studies of the smallest structural motifs of DNA detectable via vibrational circular dichroism: cytidylyl-(3'-5')-guanosine and guanylyl-(3'-5')-cytidine. Biophys J 1995; 68:1045-9. [PMID: 7756524 PMCID: PMC1281827 DOI: 10.1016/s0006-3495(95)80279-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The infrared absorption and vibrational circular dichroism (VCD) spectra of buffered aqueous solutions of cytidylyl-(3'-5')-guanosine (5'(CG)3') and guanylyl-(3'-5')-cytidine (5'(GC)3') are reported. Under low ionic strength conditions, these dinucleotides exhibit VCD features that can be predicted qualitatively from structural data of (CG)2 and (GC)2 sequences of poly(dG-dC).poly(dG-dC), using the exciton model for infrared VCD intensities.
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Affiliation(s)
- S S Birke
- Department of Chemistry, City University of New York, Hunter College, New York 10021, USA
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108
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Abstract
The observation of circular dichroism (CD) in vibrational transitions in the infrared spectral region offers new possibilities for the determination of peptide solution conformation. Infrared or vibrational CD (VCD) is a particularly sensitive probe for the conformation of various peptide turns. Results of small linear and cyclic peptides containing beta- or gamma-turns are reported.
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Affiliation(s)
- P Xie
- Department of Chemistry, City University of New York, Hunter College, NY 10021, USA
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109
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Abstract
We report observed and computed infrared (vibrational) circular dichroism spectra of a number of polyribonucleic acids in aqueous solutions in the 1600-1750 cm-1 spectral region, in which C = O and some nucleotide base ring stretching vibrations occur. The experimental data are compared with results calculated using different levels of sophistication within the exciton approach. We find that observed band shapes are generally well reproduced by these models, particularly if care is taken to determine the direction of the vibrational dipole transition moments accurately.
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Affiliation(s)
- T Xiang
- Department of Chemistry, City University of New York, Hunter College, New York 10021
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110
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Birke SS, Moses M, Kagalovsky B, Jano D, Gulotta M, Diem M. Infrared CD of deoxy oligonucleotides. Conformational studies of 5'd(GCGC)3', 5'd(CGCG)3', 5'd(CCGG)3', and 5'd(GGCC)3' in low and high salt aqueous solution. Biophys J 1993; 65:1262-71. [PMID: 8241406 PMCID: PMC1225846 DOI: 10.1016/s0006-3495(93)81176-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Infrared (vibrational) circular dichroism (VCD) spectra have been obtained for the self-complementary tetranucleotides, 5'd(CGCG)3', 5'd(GCGC)3', 5'd(CCGG)3', and 5'd(GGCC)3'. In buffered aqueous solution at low salt concentration, these tetramers exhibit spectra associated with right-handed polymers, although the spectra differ significantly for the four species. In high salt solution, a B-->Z transition occurs in 5'd(CGCG)3', while the other tetranucleotides appear only slightly altered. Temperature dependent studies of these oligonucleotides reveal a greater amount of thermal stability for the tetramers in low salt than for the high salt solutions. VCD intensities computed via the exciton formalism are compared with observed results.
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Affiliation(s)
- S S Birke
- Department of Chemistry and Biochemistry, City University of New York, Hunter College, New York 10021
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111
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Abstract
IR vibrational CD (VCD) has been observed for the cyclic pentapeptide cyclo-(-Gly-Pro-Gly-D-Ala-Pro-) in solution in CDBr3. The observed VCD spectra do not resemble the VCD features of any of the previously reported peptide secondary structures, such as alpha-helical, "random coil," or sheet structures, and might be due to the beta-turn contained in this molecule. To shed light onto the origin of the observed spectra, VCD intensity calculations, based on the solution and solid-state structures of cyclo-(-Gly-Pro-Gly-D-Ala-Pro-), have been carried out. In addition, calculated VCD data for pure beta-turns are discussed.
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Affiliation(s)
- H R Wyssbrod
- Environmental Sciences Laboratory, Brooklyn College of CUNY 11210
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112
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Abstract
The infrared vibrational circular dichroism (VCD) spectral features of prototypical peptide secondary structures were reported previously by Yasui and Keiderling [Yasui, S.C., & Keiderling, T.A. (1986) Biopolymers 25, 5]. These results demonstrated that the "random coil" peptide conformation exhibits VCD signals which are approximately mirror-image features of those exhibited by alpha-helical conformers. We report here a comparison of observed VCD spectra with those computed for several secondary structures, using the extended coupled oscillator formalism employed previously to compute VCD spectra of model DNA [Zhong et al. (1990) Biochemistry 29, 7485]. These studies suggest that the so-called random-coil peptide conformation has distinct short-range order and appears to be a left-handed, helical structure.
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Affiliation(s)
- S S Birke
- Department of Chemistry, Hunter College, City University of New York 10021
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113
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Zhong WX, Gulotta M, Goss DJ, Diem M. DNA solution conformation via infrared circular dichroism: experimental and theoretical results for B-family polymers. Biochemistry 1990; 29:7485-91. [PMID: 2223780 DOI: 10.1021/bi00484a018] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Infrared (vibrational) circular dichroism (VCD) has been observed for the DNA models d(CG)5, poly(dG-dC).poly(dG-dC), poly(dG).poly(dC), poly(dA-dT).poly(dA-dT), and poly(dA).poly(dT) in the B-conformation in buffered, aqueous solution. The observed results are quantitatively interpreted in terms of the exciton model for coupled carbonyl stretching vibrational states.
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Affiliation(s)
- W X Zhong
- Department of Chemistry, City University of New York, Hunter College, New York 10021
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114
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Gulotta M, Goss DJ, Diem M. IR vibrational CD in model deoxyoligonucleotides: observation of the B----Z phase transition and extended coupled oscillator intensity calculations. Biopolymers 1989; 28:2047-58. [PMID: 2605309 DOI: 10.1002/bip.360281202] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The first observation of ir vibrational CD (VCD) in small model DNA molecules is reported. The VCD signals in the 1550-1750-cm-1 spectral region, which originate from coupling of carbonyl stretching modes of the nucleic acid bases, are found to be sensitive to the handedness of the polymer helix. The formalism to calculate VCD intensities of polymers is developed from the exciton model derived earlier by Tinoco [(1963) Radiation Res. 20, 133; (1960) J. Chem. Phys. 33, 1332; (1964) J. Am. Chem. Soc. 86, 297] and Schellman and co-workers [(1975) Biopolymers 14, 173; (1969) J. Phys. Chem. 73, 28]. The resulting equations, which are a direct extension of the dimeric case known as the "coupled oscillator," are used in model calculations of the helical polymers.
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115
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Abstract
Infrared vibrational CD (VCD) of a small peptide, L-alanyl-L-alanyl-L-alanine (Ala3), and a peptide model, N-acetyl-L-alanine-N'-methyl-amide (AAMA), in the 1550-1750-cm-1 region has been observed. The "coupled oscillator" VCD feature observed for Ala3 in the amide I region is interpreted in terms of a solution structure stabilized by the electrostatic interaction of the zwitterionic groups. No such interactions are possible in basic aqueous solution of Ala3 nor in AAMA in neutral solution. Thus, the coupled oscillator features are lost in the latter two cases, indicating the absence of a simple stabilized conformation.
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116
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Diem M, Bhatnagar RS, Druyan ME, Renugopalakrishnan V. Solution-phase Raman-spectroscopic studies on synthetic collagen analogs: prolyl-prolyl-glycine and (prolyl-prolyl-glycine). Biopolymers 1984; 23:2955-61. [PMID: 6525410 DOI: 10.1002/bip.360231218] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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117
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Diem M, Oboodi MR, Alva C. Determination of peptide conformation via vibrational coupling: application to diastereoisomeric alanyl dipeptides. Biopolymers 1984; 23:1917-30. [PMID: 6093906 DOI: 10.1002/bip.360231008] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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118
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119
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Thieme V, Berndt B, Diem M. [Delay of surgical management in the primary care of maxillofacial bone fractures]. Stomatol DDR 1981; 31:619-26. [PMID: 6948451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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120
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Abstract
(1) The length of the human ventral spinal roots in the newborn and in the adult were compared with the length of the internodes in these roots. Internodes of fibers of a given caliber were more than twice as long in the adult sacral roots than in the cervical roots. The factors of root elongation corresponded closely to the factors of internode elongation. (2) Internode length was in a statistically significant linear relation with fiber caliber in individual roots. The slope of the regression lines differed among roots, and were steeper caudally. If data from roots having different elongation factors were pooled there was no longer a linear relationship between fiber caliber and internode length. Internode length, therefore, correlated directly and quantitatively with root elongation; it was not directly linked to fiber caliber. (3) The total Schwann cell population per fiber was nearly stable from the newborn to the adult, but the sacral roots had 5 times as many Schwann cells as the cervical roots. Calculations based on the number of internodes and on the length of fetal roots at the onset of myelination showed that the mean "initial length" of the Schwann cell at the onset of myelination was 187 micrometer, the same for all roots. (4) The Schwann cell population per fiber is determined by 2 reciprocal growth phases: elongation of the fetal fiber up to the onset of myelination corresponds to a multiplication of Schwann cells each having a given initial length. Schwann cell populations stabilize after the onset of myelination; from then on the geometry of each internode is determined by its passive elongation. The timing of myelination is critical for determining the ultimate length of the Schwann cell. If myelination does not begin before a fiber system has attained approximately one eighth of its definitive size, the longest internodes of that system will average 1.5 mm and most will remain below 2 mm, regardless of body size.
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121
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Nafie LA, Polavarapu PL, Diem M. Vibrational optical activity in perturbed degenerate modes: Concepts and model calculations in 1‐substituted haloethanes. J Chem Phys 1980. [DOI: 10.1063/1.440735] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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122
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Hudgens BA, Diem M, Burow DF. Spectra and structure of chiral molecules. III.a) Vibrational assignment and normal coordinate analysis of 1‐bromo‐1‐chloro‐1‐fluoroethane and 1‐bromo‐1‐chloro‐1‐fluoroethane?2‐d1. J Chem Phys 1978. [DOI: 10.1063/1.435874] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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123
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Bragin J, Diem M, Guthals D, Chang S. The vibrational spectrum and lattice dynamics of polycrystalline ammonium hydrosulfide. J Chem Phys 1977. [DOI: 10.1063/1.434936] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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124
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125
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Diem M, Diem MJ, Hudgens BA, Fry JL, Burow DF. Raman optical activity in 1-halogeno-2-methylbutanes: observation of conformer dependent circular intensity differentials in carbon–halogen stretching modes. ACTA ACUST UNITED AC 1976. [DOI: 10.1039/c39760001028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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126
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Diem M. Schneeforschung. Naturwissenschaften 1944. [DOI: 10.1007/bf01468408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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