Collect. Czech. Chem. Commun.
1963, 28, 3392-3401
https://doi.org/10.1135/cccc19633392
Nucleic acids components and their analogues. XLII. The infrared spectra of 6-azauracil and its derivatives
M. Horák and J. Gut
Individual author index pages
Other CCCC articles of these authors
- Š. Urban, M. Horák and A. Vítek
Application of a general profile function to mathematic description and to separation of bands in the infrared spectrum of methanesulphonyl chloride
1976, Vol. 41, Issue 12, pp. 3685–3690 [Abstract] - A. Nováček, V. Sedláčková and J. Gut
Reaction of 8-chloro-10-phenylhydrazono-10,11-dihydrodibenzo[b,f]thiepine with aromatic aldehydes
1976, Vol. 41, Issue 3, pp. 785–787 [Abstract] - V. Uchytilová, J. Hájková, P. Fiedler, Z. Györgydeák, J. Škoda and J. Gut
Preparation of 3,5-dioxohexahydro-1,2,4-triazine-1-carboxylic acid (dihydro-6-azaorotic acid) derivatives
1976, Vol. 41, Issue 2, pp. 472–478 [Abstract] - A. Nováček and J. Gut
Reaction of 1-substituted semicarbazide derivatives with benzaldehyde
1975, Vol. 40, Issue 11, pp. 3512–3518 [Abstract] - M. Horák and P. Tvarůžek
Protionization of the hexamethylenetetramine molecule
1975, Vol. 40, Issue 9, pp. 2741–2751 [Abstract] - A. Pískala, J. Gut and F. Šorm
Reaction of 3,5,6-trichloro-1,2,4-triazine with simple nucleophiles
1975, Vol. 40, Issue 9, pp. 2680–2688 [Abstract] - V. Uchytilová, A. Holý, D. Cech and J. Gut
Preparation of 2-pyrimidinone and derivatives
1975, Vol. 40, Issue 8, pp. 2347–2352 [Abstract] - A. Pískala, P. Fiedler, M. Synáčková and J. Gut
Preparation and the tautometric structure of 3-methoxy-1,2,4-triazin-5-one and 5-methoxy-1,2,4-triazin-3-one
1975, Vol. 40, Issue 8, pp. 2326–2339 [Abstract] - M. Horák, S. Hilgard and P. Hobza
Stabilization energy of collision complexes and its semiempirical calculations
1975, Vol. 40, Issue 6, pp. 1801–1810 [Abstract] - A. Nováček and J. Gut
Reaction of 8-chloro-10,11-dihydrodibenzo[b,f]thiepin-10-one with aromatic aldehydes
1975, Vol. 40, Issue 4, pp. 1034–1037 [Abstract] - A. Nováček and J. Gut
The p-benzoquinone oxidation of hexahydro-1,2,4-triazine-3,5-dione
1974, Vol. 39, Issue 12, pp. 3760–3762 [Abstract] - S. Hilgard, M. Horák and A. Vystrčil
Formation and stabilization energy of very weak collision complexes of alcohols and carboxylic acid monomers with non-polar solvents
1974, Vol. 39, Issue 11, pp. 3215–3223 [Abstract] - M. Horák and R. Josefi
Vibrational spectra and conformation of molecules of diphenyl ether and its derivatives at liquid nitrogen temperature
1974, Vol. 39, Issue 11, pp. 3209–3214 [Abstract] - R. Josefi, E. Drahorádová and M. Horák
Rotational isomerism, vibrational and NMR spectra of 3-substituted anisoles
1974, Vol. 39, Issue 6, pp. 1541–1552 [Abstract] - M. Horák and A. Vítek
Computerized assignment of the binary combination/overtone vibrational frequencies to infrared bands of monohalogeno benzenes
1974, Vol. 39, Issue 5, pp. 1107–1117 [Abstract] - J. Farkaš, Z. Flegelová, V. Uchytilová and J. Gut
Preparation of 1-substituted hydrazinoacetic acids
1973, Vol. 38, Issue 5, pp. 1434–1437 [Abstract] - M. Horák and A. Vystrčil
The low-temperature infrared spectrum of the s-trans form of benzalacetone
1973, Vol. 38, Issue 4, pp. 1156–1158 [Abstract] - M. Prystaš, V. Uchytilová and J. Gut
Chemistry of 1,2,4-triazine. IV. Methylation of 2,3,4,5-tetrahydro-1,2,4-triazine-3,5-dione with dimethyl sulfate in neutral media
1973, Vol. 38, Issue 3, pp. 934–937 [Abstract] - A. Nováček and J. Gut
Chemistry of 1,2,4-triazine. III. The reaction of hexahydro-1,2,4-triazine-3,5-dione with primary amines
1973, Vol. 38, Issue 2, pp. 592–594 [Abstract] - V. Uchytilová, P. Fiedler and J. Gut
Chemistry of 1,2,4-triazine. II. Synthesis of substituted 5-amino-1,2,4-triazines
1972, Vol. 37, Issue 7, pp. 2221–2226 [Abstract] - M. Horák, V. Šára and J. Moravec
Determination of thermodynamic functions by means of infrared spectroscopy. II. Axial and equatorial hydrogen bonds
1972, Vol. 37, Issue 6, pp. 1990–1992 [Abstract] - A. Nováček and J. Gut
Preparation and cyanoethylation of some hydrazine derivatives
1971, Vol. 36, Issue 8, pp. 3038–3042 [Abstract] - M. Horák and J. Moravec
Studies of solute-solvent interactions. V. The solvent induced frequency shifts of the ν(C=O) and ν(C≡N) infrared bands
1971, Vol. 36, Issue 8, pp. 2757–2765 [Abstract] - V. Uchytilová and J. Gut
Nucleic acid components and their analogues. CXXXVI. A simple synthesis of 6-azacytosine
1971, Vol. 36, Issue 6, pp. 2383–2385 [Abstract] - V. Uchytilová, P. Fiedler, M. Prystaš and J. Gut
On the chemistry of 1,2,4-triazine I. Synthesis of substituted 1,2,4-triazin-5-ones from α-keto acid amidrazone derivatives
1971, Vol. 36, Issue 5, pp. 1955–1963 [Abstract] - M. Horák and J. Moravec
Studies of solute-solvent interactions. IV. Solvent effects on half-widths and intensities of ν(OH) band in infrared spectra
1971, Vol. 36, Issue 2, pp. 544–550 [Abstract] - C. Garrigou-Lagrange, M. Horák, R. K. Khanna and E. R. Lippincott
Interprétation des spectres de vibration de quelques dérivés du diphényléther d'aprés l'hypothése d'une structure moléculaire non rigide
1970, Vol. 35, Issue 11, pp. 3230–3251 [Abstract] - M. Horák, J. Pitrová, R. Řeřicha and V. Horák
Molecular structure diagnosis with the use of infrared spectroscopy and computer applied to dialkyl sulphides
1970, Vol. 35, Issue 11, pp. 3223–3229 [Abstract] - V. Šára, J. Moravec, V. Horák and M. Horák
Determination of thermodynamic functions by means of infrared spectroscopy. Complex formation in phenol-aliphatic sulfide and phenol-aliphatic sulfoxide systems
1969, Vol. 34, Issue 8, pp. 2390–2397 [Abstract] - J. Beránek and J. Gut
Nucleic acid components and their analogues. CXXVI. Synthesis of substituted 5-amino-2,3-dihydro-1,2,4-triazin-3-one (6-azacytosine) derivatives
1969, Vol. 34, Issue 8, pp. 2306–2315 [Abstract] - J. Knížek, M. Jakoubková, V. Chvalovský and M. Horák
Organosilicon compounds. LXI. Infrared spectra of derivatives of phenylsilane C6H5SiXYZ in the region of 1600-700 cm-1; The effect of substituents X, Y, and Z on the vibrations of the phenyl group
1968, Vol. 33, Issue 11, pp. 3470–3477 [Abstract] - J. Gut, A. Nováček and P. Fiedler
Reaction of six-membered cyclic hydrazides with aromatic aldehydes
1968, Vol. 33, Issue 7, pp. 2087–2096 [Abstract] - R. Řeřicha and M. Horák
Determination of the degree of branching in alkanes by infrared spectroscopy. III. Analytical application
1968, Vol. 33, Issue 2, pp. 496–505 [Abstract] - R. Řeřicha, P. Jarolímek and M. Horák
Determination of the degree of branching in alkanes by infrared spectroscopy. II. Variation of the intensity of the antisymmetrical stretching vibration bands of C-H bonds in CH3 and CH2 groups
1967, Vol. 32, Issue 5, pp. 1903–1912 [Abstract] - M. Bobek, J. Farkaš and J. Gut
Nucleic acids components and their analogues. XCI. An improved synthesis of 6-azauracil and its 5-substituted derivatives
1967, Vol. 32, Issue 3, pp. 1295–1298 [Abstract] - R. Řeřicha and M. Horák
Determination of the degree of branching in alkanes by infrared spectroscopy. I. Resolution of overlapping absorption bands in the 3000-2900 cm-1 region
1967, Vol. 32, Issue 3, pp. 1125–1136 [Abstract] - A. Nováček and J. Gut
Nucleic acids components and their analogues. LXXXVII. The preparation of 1-amino-5,6-dihydrouracil and its derivatives
1967, Vol. 32, Issue 1, pp. 190–197 [Abstract] - J. Gut, D. Hesoun and A. Nováček
Nucleic acids components and their analogues. LXXXIII. Synthesis of 3-amino-2,5-dihydro-1,2,4-triazin-5-one (azaisocytosine) and its N-substituted derivatives
1966, Vol. 31, Issue 5, pp. 2014–2024 [Abstract] - J. Piťha, P. Fiedler and J. Gut
Nucleic acids components and their analogues. LXXXII. The fine structure of 6-azaisocytosine and its derivatives
1966, Vol. 31, Issue 4, pp. 1864–1871 [Abstract] - M. Jakoubková, M. Horák and V. Chvalovský
Organosilicon compounds. XLVI. Infrared spectra of silyl- and silylmethyl-substituted cyclopropane derivatives
1966, Vol. 31, Issue 3, pp. 979–996 [Abstract] - M. Horák, J. Poláková, M. Jakoubková, J. Moravec and J. Plíva
Studies of solute-solvent interactions. III. Solvation of donor-acceptor complexes of phenols with basic solvents
1966, Vol. 31, Issue 2, pp. 622–639 [Abstract] - J. Moravec, P. Kouřím and M. Horák
Vibration spectra of triphenylmethyl methyl ether and its d3 derivative
1965, Vol. 30, Issue 7, pp. 2298–2306 [Abstract] - A. Nováček, D. Hesoun and J. Gut
Nucleic acids components and their analogues. LXI. Acylation of 6-azauracil, uracil and their 5-methyl derivatives
1965, Vol. 30, Issue 6, pp. 1890–1899 [Abstract] - J. Knížek, V. Chvalovský and M. Horák
Organosilicon compounds. XXXVII. C-H stretching vibrations of phenyl groups in the infrared spectra of phenylsilanes C6H5SiXYZ and monosubstituted derivatives of benzene C6H5CXYZ
1964, Vol. 29, Issue 12, pp. 2935–2949 [Abstract] - A. Pískala and J. Gut
Nucleic acids components and their analogues. LII. Isomerisation of 2,4-dimethoxy-1,3,5-triazine
1964, Vol. 29, Issue 11, pp. 2794–2808 [Abstract] - J. Gut, Jiří Jonáš and J. Piťha
Nucleic acid components and their analogues. XLIX. Tautomeric structure of 6-azacytosine and its derivatives
1964, Vol. 29, Issue 6, pp. 1394–1400 [Abstract] - J. Knížek, M. Horák and V. Chvalovský
Organosilicon compounds. XXXI. Spectroscopic behaviour of the vinyl group in silylolefins
1963, Vol. 28, Issue 11, pp. 3079–3087 [Abstract] - J. Gut
Nucleic acids components and their analogues. XXXVII. Acetylation of dihydro-6-azauracil and its N-methyl derivatives
1963, Vol. 28, Issue 9, pp. 2527–2529 [Abstract] - M. Prystaš and J. Gut
Nucleic acids components and their analogues. XXXVIII. Reaction of ethyl nitroacetate with ethyl orthoformate and ureas. Synthesis of 5-nitrouracil and its derivatives
1963, Vol. 28, Issue 9, pp. 2501–2509 [Abstract] - A. Pískala and J. Gut
Nucleic acids components and their analogues. XXXV. A contribution to the reaction of ethyl orthoformate with urea
1963, Vol. 28, Issue 9, pp. 2376–2380 [Abstract] - M. Horák, J. Šmejkal and J. Farkaš
Infrared spectra of compounds containing a cyclopropane ring
1963, Vol. 28, Issue 9, pp. 2280–2294 [Abstract] - A. Pískala and J. Gut
Nucleic acid components and their analogues. XXXIII. New synthesis of 5-azauracil (allantoxaidine), 5-azacytosine (4-amino-2-oxo-1,2-dihydro-1,3,5-triazine) and their methyl derivatives
1963, Vol. 28, Issue 7, pp. 1681–1690 [Abstract] - R. Zahradník, J. Koutecký, Jiří Jonáš and J. Gut
Nucleic acid components and their analogues. XXXI. Electronic structure of uracil, 5-azauracil and 6-azauracil
1963, Vol. 28, Issue 6, pp. 1499–1506 [Abstract] - Jiří Jonáš, M. Horák, A. Pískala and J. Gut
Nucleic acid components and their analogues. XXVI. Ultraviolet and infrared spectra of 5-azauracil and related compounds
1962, Vol. 27, Issue 12, pp. 2754–2760 [Abstract] - M. Prystaš and J. Gut
Nucleic acid components and their analogues. XXV. Note on the preparation of 2,4-dithio-6-azauracil methyl derivatives
1962, Vol. 27, Issue 8, pp. 1898–1904 [Abstract] - Jiří Jonáš and J. Gut
Nucleic acid components and their analogues. XXIV. Ultraviolet spectra and dissociation constants of 6-azauracil thioxo derivatives
1962, Vol. 27, Issue 8, pp. 1886–1897 [Abstract] - J. Škoda, A. Čihák, J. Gut, M. Prystaš, A. Pískala, C. Párkányi and F. Šorm
Nucleic acid components and their analogues. XXIII. Inhibition of growth of Escherichia coli by derivatives of pyrimidine, 5-azauracil, 6-azauracil and some simpler models of these derivatives
1962, Vol. 27, Issue 7, pp. 1736–1743 [Abstract] - M. Prystaš, J. Gut and F. Šorm
Nucleic acid components and their analogues. XXI. Synthesis of 3-methyl-6-azauridine, structure proof and general approach to the synthesis of 6-azauridines
1962, Vol. 27, Issue 7, pp. 1572–1577 [Abstract] - A. Pískala and J. Gut
Nucleic acid components and their analogues. XX. Synthesis of oxonic acid (2,4-dioxo-1,2,3,4-tetrahydro-1,3,5-triazine-6-carboxylic acid) and the acetylation of 2,4-dioxohexahydro-1,3,5-triazines
1962, Vol. 27, Issue 7, pp. 1562–1571 [Abstract] - M. Prystaš and J. Gut
Nucleic acid components and their analogues. XVII. Reaction of uracil and of its aza analogues with ethylene carbonate
1962, Vol. 27, Issue 4, pp. 1054–1056 [Abstract] - Jiří Jonáš and J. Gut
Nucleic acid components and their analogues. XVI. Dissociation constants of uracil, 6-azauracil, 5-azauracil and related compounds
1962, Vol. 27, Issue 3, pp. 716–723 [Abstract] - J. Krupička and J. Gut
Nucleic acids components and their analogues. XV. Polarographic behaviour of 6-azauracil and its derivatives
1962, Vol. 27, Issue 3, pp. 546–553 [Abstract] - M. Horák, J. Smolíková and J. Piťha
Spectroscopic study of the hydrogen bond in substituted 2-nitrophenols
1961, Vol. 26, Issue 11, pp. 2891–2896 [Abstract] - A. Pískala and J. Gut
Nucleic acid components and their analogues. XIII. Synthesis of 5-azauracil (allantoxaidin) and its N-methyl derivatives
1961, Vol. 26, Issue 10, pp. 2519–2529 [Abstract] - Jiří Jonáš and J. Gut
Nucleic acids components and their analogues. XII. Electronic absorption spectra of 6-azauracil and related compounds
1961, Vol. 26, Issue 9, pp. 2155–2163 [Abstract] - M. Horák and J. Gut
Nucleic acids components and their analogues. XI. Infrared spectroscopy of uracil, 8-azauracil and their derivatives in the carbonyl group stretching vibration region
1961, Vol. 26, Issue 6, pp. 1680–1693 [Abstract] - J. Piťha, J. Plešek and M. Horák
Kondensationsreaktionen vom Aldoltypus V. Zur Konfiguration von Derivaten des 2,3-Cyclohexano-(1,3,3)-bicyclononan-2-ol-9-ons
1961, Vol. 26, Issue 4, pp. 1209–1212 [Abstract] - J. Gut, M. Prystaš and Jiří Jonáš
Nucleic acid components and their analogues. X. Methyl derivatives of 6-azauracil thioxo analogues
1961, Vol. 26, Issue 4, pp. 986–997 [Abstract] - J. Gut, M. Prystaš, Jiří Jonáš and F. Šorm
Nucleic acid components and their analogues. IX. N-Methyl derivatives of 6-azauracil and 6-azathymine
1961, Vol. 26, Issue 4, pp. 974–985 [Abstract] - V. Jarolím, K. Hejno, M. Streibl, M. Horák and F. Šorm
Über die Zusammensetzung der Braunkohle II. Über weitere Inhaltsstoffe des Montanwachses
1961, Vol. 26, Issue 2, pp. 459–465 [Abstract] - M. Horák, V. Bažant and V. Chvalovský
Organosiliciumverbindungen XX. Bestimmung der Basizität von siliciumgebundenem Sauerstoff mittels der Infrarot-Spektroskopie
1960, Vol. 25, Issue 11, pp. 2822–2830 [Abstract] - J. Piťha, M. Horák, J. Kovář and K. Bláha
Configuration of nitrogen-containing compounds. XI. The effect of configuration on the infrared spectra of some aminohydroxytetralins
1960, Vol. 25, Issue 11, pp. 2733–2745 [Abstract] - F. Šantavý, M. Maturová, A. Němečková and M. Horák
Beitrag zur Konstitutionsaufklärung des Rhoeadins
1960, Vol. 25, Issue 7, pp. 1901–1913 [Abstract] - M. Horák and J. Plíva
Spectroscopic properties of the geminal dimethyl group on cyclopropane and of the isopropylidene group
1960, Vol. 25, Issue 6, pp. 1679–1682 [Abstract] - J. Piťha and M. Horák
Spectroscopic study of the intramolecular interaction of an aliphatic hydroxyl group and a benzene nucleus
1960, Vol. 25, Issue 6, pp. 1586–1590 [Abstract] - F. Šantavý, M. Horák, M. Maturová and J. Brabenec
Beitrag zur Konstellation des Chelidonins und Erklärung einiger seiner Reaktionen
1960, Vol. 25, Issue 5, pp. 1344–1350 [Abstract] - J. Krupička and J. Gut
Komponenten der Nucleinsäuren und ihre Analoge VI. Polarographische Bestimmung von 6-Azauracil und 6-Azauridin
1960, Vol. 25, Issue 2, pp. 592–595 [Abstract] - M. Holub, V. Herout, M. Horák and F. Šorm
On terpenes. CIV. The constitution of betulenols from oil from the buds of white birch (Betula alba L.)
1959, Vol. 24, Issue 11, pp. 3730–3738 [Abstract] - F. Šantavý, M. Maturová, A. Němečková and M. Horák
Zur konstitution des Rhoeadins
1959, Vol. 24, Issue 10, pp. 3493–3494 [Abstract] - M. Horák, B. Schneider and V. Bažant
Organosilicon compounds. XVI. Molecular spectra of methylphenylsiloxanes
1959, Vol. 24, Issue 10, pp. 3381–3388 [Abstract] - J. Gut, J. Morávek, C. Párkányi, M. Prystaš, J. Škoda and F. Šorm
Nucleic acids components and their analogues. III. Antimicrobial effect of some pyrimidine analogues and related compounds
1959, Vol. 24, Issue 9, pp. 3154–3162 [Abstract] - M. Horák and P. Munk
Spektrale Eigenschaften einiger ungesättigter Ketone
1959, Vol. 24, Issue 9, pp. 3024–3028 [Abstract] - O. Exner and M. Horák
Oximderivate V. Konstitutionsermittlung der Acylderivate des Hydroxylamins durch Infrarotspektroskopie
1959, Vol. 24, Issue 9, pp. 2992–3001 [Abstract] - J. Gut and M. Prystaš
Komponenten der Nucleinsäuren und ihre Analoge II. Synthese einiger 5-substituierter 6-Azauracil-Derivate
1959, Vol. 24, Issue 9, pp. 2986–2991 [Abstract] - I. Ognjanov, V. Herout, M. Horák and F. Šorm
Über Terpene CIII. Über die Konstitution von β-Elemenon aus bulgarischem Geraniumöl
1959, Vol. 24, Issue 7, pp. 2371–2377 [Abstract] - J. Smrt, J. Beránek and M. Horák
N-Hydroxypyrrolidon-(2), ein neuer Pyrrolidonderivat-Typ
1959, Vol. 24, Issue 5, pp. 1672–1676 [Abstract] - M. Horák and J. Fajkoš
Über Steroide XLII. Über die Infrarotspektren und die Nah-konstellation der Steroiden Bromhydrine
1959, Vol. 24, Issue 5, pp. 1515–1519 [Abstract] - L. Dolejš, M. Souček, M. Horák and F. Šorm
On terpenes. XCVII. The constitution of ledol
1959, Vol. 24, Issue 4, pp. 1353–1356 [Abstract] - O. Exner and M. Horák
Infrarotspektroskopie von Carbonsäurederivaten
1959, Vol. 24, Issue 3, pp. 968–977 [Abstract] - J. Sicher, M. Horák and M. Svoboda
Stereochemical studies. XV. The effect of ring size and configuration on the infrared spectra of the 2-aminocyclanols
1959, Vol. 24, Issue 3, pp. 950–957 [Abstract] - L. Dolejš, M. Souček, M. Horák, V. Herout and F. Šorm
On terpenes. XCIV. The structure of lactucin
1958, Vol. 23, Issue 12, pp. 2195–2200 [Abstract] - I. Ognjanov, D. Ivanov, V. Herout, M. Horák, J. Plíva and F. Šorm
On terpenes. LXXXVIII. The structure of germacrone, the crystalline constituent of Bulgarian zdravets oil
1958, Vol. 23, Issue 11, pp. 2033–2045 [Abstract] - J. Gut
Eine einfache Synthese des 6-Azauracils und 6-Azathymins
1958, Vol. 23, Issue 8, pp. 1588–1591 [Abstract] - J. Gut
Über eine einfache Synthese der Trimellith- und Hemimellithsäure
1956, Vol. 21, Issue 6, pp. 1648–1650 [Abstract] - F. Šorm and M. Horák
On steroids. XXII. Synthesis of 16β-hydroxyandrost-4-en-3-one and 16ξ-hydroxy-16ξ-methylandrost-4-en-3-one
1956, Vol. 21, Issue 4, pp. 926–931 [Abstract] - Ö. Kovács, V. Herout, M. Horák and F. Šorm
On terpenes. LXVII. Hydrogenation products of santonin and alantolactone
1956, Vol. 21, Issue 1, pp. 225–239 [Abstract] - F. Šorm, J. Kučera and J. Gut
On terpenes. XXVI. The total synthesis of Se-guaiazulene
1951, Vol. 16, pp. 184–197 [Abstract] - F. Šorm, J. Gut, J. Hlavnička, J. Kučera and L. Šedivý
On terpenes. XXV. The total synthesis of S-guaiazulene
1951, Vol. 16, pp. 168–183 [Abstract] - M. Horák and J. Staněk
2-Methyl 6-styrylpyridin
1950, Vol. 15, pp. 1046–1049 [Abstract] - J. Staněk and M. Horák
A new application of the Perkin reaction
1950, Vol. 15, pp. 1037–1045 [Abstract] - F. Šorm, J. Gut, M. Suchý and D. Reichl
Chloramphenicol analogues I.
1950, Vol. 15, pp. 501–511 [Abstract] - F. Šorm, J. Gut and P. Kaňkovský
On the condensation of ethyl cyanoacetate with some cyclic anhydrides and imides
1950, Vol. 15, pp. 99–106 [Abstract] - M. Horák and J. Staněk
Condensation effect of stannic chloride. I. Preparation of diphenylacetic acid
1949, Vol. 14, pp. 551–554 [Abstract] - R. Lukeš, F. Kastner, J. Gut and T. Herben
Essais d'introduire un nouveau mode de préparation des esters β-cétoadipiques
1947, Vol. 12, pp. 647–654 [Abstract]