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  • 1
    Electronic Resource
    Electronic Resource
    The time course of phosphorylcreatine resynthesis during recovery of the quadriceps muscle in man (1976)
    Springer
    Pflügers Archiv 367 (1976), S. 137-142 
    Details
    ISSN: 1432-2013
    Keywords: Man ; Muscle ; Exercise ; Recovery ; Phosphorylcreatine ; Phosphagen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The time course of phosphorylcreatine (PC) resynthesis in the human m. quadriceps femoris was studied during recovery from exhaustive dynamic exercise and from isometric contraction sustained to fatigue. The immediate postexercise muscle PC content after either form of exercise was 15–16% of the resting muscle content. The time course of PC resynthesis during recovery was biphasic exhibiting a fast and a slow recovery component. The half-time for the fast component was 21–22 s but this accounted for a smaller fraction of the total PC restored during recovery from the isometric contraction than after the dynamic exercise. The half-time for the slow component was in each case more than 170 s. After 2 and 4 min recovery the total amounts of PC resynthesized after the isometric exercise were significantly lower than from the dynamic exercise. Occlusion of the circulation to the quadriceps completely abolished the resynthesis of PC. Restoration of resynthesis occurred only after release of occlusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585149
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  • 2
    Electronic Resource
    Electronic Resource
    Glycolytic intermediates in human muscle after isometric contraction (1981)
    Springer
    Pflügers Archiv 389 (1981), S. 277-282 
    Details
    ISSN: 1432-2013
    Keywords: Lactate ; Glycogenolysis ; Muscle contraction ; Glycogen ; Human muscle ; Recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Isometric contraction of the quadriceps muscle sustained to fatigue with a force of 66% of the maximum voluntary contraction force resulted in a mean glycogen utilization of 80.4 (S.D. 58.4) mmol glucosyl units/kg dry muscle (d.m.) and an accumulation of glycolytic intermediates and glucose corresponding to 82.9 (S.D. 17.5) mmol glucosyl units/kg d.m. Accumulation of hexose phosphates (principally glucose 6-phosphate) accounted for 35.4% (S.D. 4.1) of the total increase and lactate for 59.3% (S.D. 2.8). During a 4 min recovery period glucose 6-[hosphate content showed a linear decrease with a half time of 2.0 min and lactate decreased exponentially with a half time of 2.5 min. The rate of lactate disappearance from the muscle was approximately 4 times as fast as that observed previously after maximal bicycle exercise. This was probably due to a lower lactate concentration in blood after isometric contraction resulting in a larger muscle-blood gradient for lactate. Muscle content of free glucose was increased after contraction and increased further during recovery. It is concluded that the glucose increase is confined to the intracellular pool and is an effect of hexokinase inhibition by accumulated glucose 6-phosphate. Occlusion, of the local circulation after the contraction inhibited the recovery processes for lactate and glucose 6-phosphate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584790
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  • 3
    Electronic Resource
    Electronic Resource
    Lactate content and pH in muscle samples obtained after dynamic exercise (1976)
    Springer
    Pflügers Archiv 367 (1976), S. 143-149 
    Details
    ISSN: 1432-2013
    Keywords: Hydrogen ion ; Lactate ; Pyruvate ; Exertion ; Muscle ; Blood ; Man ; Recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Analyzes were made on muscle samples taken from the lateral part of the m. quadriceps femoris of man (lactate, pyruvate, and pH) on venous blood (lactate, pyruvate) and on capillary blood (pH). Samples were taken at rest, immediately after termination of dynamic exercise and during 20 min recovery from exhaustive dynamic exercise. Muscle pH decreased from 7.08 at rest to 6.60 at exhaustion. Decrease in muscle pH was linearly related to muscle content of lactate + pyruvate. The relationship was slightly different from what has been obtained after isometric exercise and this difference was ascribed to acid-base exchange with the blood during dynamic exercise. Lactate content was highly elevated in muscle after exercise and the concentration was 2–3 times higher than in blood. Pyruvate content was, however, only slightly higher than that at rest. During recovery lactate content of muscle decreased exponentially with respect to time, whereas pyruvate content increased. The half-time of lactate decrease was 9.5 min. From the lactate dehydrogenase equilibrium relative values on NADH/NAD ratio could be calculated. It was found that NADH/NAD was highly increased after exercise and that it had not returned to the basal value after 20 min recovery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585150
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  • 4
    Electronic Resource
    Electronic Resource
    Silicon-29 and carbon-13 n.m.r. studies of organosilicon chemistry. VIISee Ref. 25 for Part VI and Ref. 26 for Part V. - trimethylsilylated silicates (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 426-431 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Silicon-29 n.m.r. was used to study the products from trimethylsilylation of minerals. Chemical shifts are reported for four model compounds, viz. the monomer, dimer, linear trimer (from natrolite) and cyclic tetramer (from laumontite). Information is then obtained from the products of trimethylsilylation of the anhydrous calcium silicates wollastonite and pseudo-wollastonite. In the latter case it is shown that the principal products are the four model compounds, and percentage yields are obtained for these.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090712
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  • 5
    Electronic Resource
    Electronic Resource
    29Si and 13C NMR studies of organosilicon chemistry. VThe previous paper in this series is Ref. 1. - Sugar derivatives (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 635-636 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 29Si spectra have been obtained for four trimethylsilylated hexopyranoside sugars, and the resonance due to the CH2OSiMe3 group at position 5 has been assigned by experiments involving gated decoupling at a single 1H frequency.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270071217
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  • 6
    Electronic Resource
    Electronic Resource
    High-resolution 13C NMR studies of solid 1,4-bis(n-butylamino)anthraquinone (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 784-788 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High-resolution 13C NMR spectra of solid 1,4-bis(n-butylamino)anthraquinone are presented. In spectra measured at 22.6 MHz the effects of two short-range and two long-range residual (13C, 14N) dipolar couplings have been observed. Only the short-range effects are observable in the 50.3 MHz spectra. These typical asymmetric doublets allow the determination of the 14N nuclear quadrupole coupling constant (χ=e2Qq/h=-3.0 MHz), the asymmetry parameter (η=0.3) and the orientation of the electric field gradient tensor of the 14N in the molecular framework.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270221211
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  • 7
    Electronic Resource
    Electronic Resource
    NMR spectra of 1,3-butadienes: VII - the conformation of 2,4-dimethyl-2,4-pentadiene (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 121-125 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton magnetic resonance spectra of 2,4-dimethyl-2,4-pentadiene have been examined for a number of solution conditions and (for a CF2Cl2 solution) over a range of temperatures. Coupling constants for the ethylenic protons were obtained from double resonance (methyl decoupled) spectra. Further double resonance experiments established the sign of 4Jc. It is found that 4Jc = -1·20 Hz and [4Jt] = 0·18 Hz. It is concluded that the compound exists in a single nonplanar conformation with an average dihedral angle (from the s-cis form) φ = 50° ± 15°. Some long range coupling constants involving the methyl group were found to be appreciable in spite of the lack of planarity of the diene chain.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060214
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  • 8
    Electronic Resource
    Electronic Resource
    Peak suppression in Fourier transform n.m.r.: Application of the selective excitation technique to the problem of 13C satellites in 31P resonance (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 58-60 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Selective pulsed excitation was used in a technique to suppress the resonance due to a per-12C-isotopomer so as to overcome dynamic range problems when observing ‘13C satellite’ lines. The technique was used to obtain nuclear spin parameters from the 13C satellites in 31P resonance for the racemic isomer of P,P′-dimethyl-P,P′-diphenyldiphosphine disulphide, [MePhP(:S)]2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090113
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  • 9
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance studies of 1,3-butadienes. IXPart VIII is Ref. 1 but was incorrectly entitled Part VII. The correct Part VII is Ref. 2. - The 1H spectra of isoprene and related compounds (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 483-488 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Full analyses of the five-spin 1H n.m.r. spectra for the diene protons of isoprene, ethylbutadiene and β-myrcene under conditions of decoupling the sidechain α-protons are reported. The data are discussed in terms of spin-spin coupling mechanism and molecular conformation. The fully-coupled spectra of the compounds were also examined and coupling information obtained.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090808
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  • 10
    Electronic Resource
    Electronic Resource
    J. W. Emsley, L. Phillips and V. Wray. Fluorine coupling constants. Pergamon Press (Oxford), 1977. 672 pages. $75.00. £37·50 (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. iii 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270110411
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