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  • 1
    Electronic Resource
    Electronic Resource
    Conformational studies of oxygen-heterocyclic eight-membered rings (1972)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 1389-1390 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00759a077
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  • 2
    Electronic Resource
    Electronic Resource
    Ring inversion in cyclohexanone (1973)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 4423-4424 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00794a050
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  • 3
    Electronic Resource
    Electronic Resource
    Conformations and energy barriers in medium-and large-ring ketones. Evidence from carbon-13 and proton nuclear magnetic resonance (1973)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 7877-7878 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00804a059
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Polycyclic aromatic hydrocarbons in soil and air: statistical analysis and classification by the SIMCA method (1987)
    s.l. : American Chemical Society
    Environmental science & technology 21 (1987), S. 35-44 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00155a003
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  • 5
    Electronic Resource
    Electronic Resource
    Hyperosmotic perfusion of the beating rat heart and the role of the Na+/K+/2CI− co-transporter and the Na+/H+ exchanger (2000)
    Springer
    Basic research in cardiology 95 (2000), S. 19-27 
    Details
    ISSN: 1435-1803
    Keywords: Key words Osmolar Concentration – sodium hydrogen antiporter – sodium chloride potassium co-transporter – electrolyte metabolism –31P magnetic resonance spectroscopy – 5-(N-ethyl-N-isoprophyl) amiloride – 3-methylsulphonyl-4-piperidinobenzoyl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of the present study was to investigate the role of the Na+/K+/2CI− co-transporter and the Na+/H+ exchanger on contractile function and electrolyte regulation during hyperosmotic perfusion of the heart. Langendorff perfused rat hearts were subjected to hyperosmolal perfusion in 10-min intervals. Perfusates were made hyperosmotic by adding mannitol to the buffer (370, 450 and 600 mOsmol/kg H2O). Cardiac contractile function was monitored with a balloon in the left ventricle (LV) coupled to a pressure transducer. Cardiac effluent was sampled repeatedly throughout and after hyperosmotic perfusion and analyzed for content of Na+, K+ and CI−. All three hyperosmotic perfusates initially reduced LV developed pressure (LVDP), but for 370 and 450 mOsmol/kg H2, LVDP recovered to baseline within 4 min of perfusion. With 600 mOsmol/kg H2, LVDP recovered slowly and was 50% below baseline after 10 min of hyperosmotic perfusion. Inhibition of the Na+/H+ exchanger with 5-(N-ethyl-N-isopropyl) amiloride (EIPA) and 3-methyl-sulfonyl-4-piperidinobenzoyl-guanidine methanesulfonate (HOE 694) abolished the recovery of LVDP to the 600 mOsmol/kg H2 perfusate, whereas inhibition of the Na+/K+/2CI− co-transporter had no impact on LVDP. Potassium was taken up by the heart during hyperosmotic perfusion and this uptake was significantly reduced with inhibition of the Na+/H+ exchanger. Intracellular pH was assessed with 31P magnetic resonance spectroscopy and hyperosmolality induced a significant alkalosis that was dependent upon the Na+/H+ exchanger. The rat heart responds to moderate elevations in osmolality with a transient reduction in contractile function, whereas an elevation of 300 mOsmol/kg H2 persistently reduces contractile function. The Na+/H+ exchanger, but not the Na+/K+/2CI− co-transporter, is of importance in contractile recovery and electrolyte regulation during hyperosmotic perfusion in the rat heart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003950070054
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  • 6
    Electronic Resource
    Electronic Resource
    Plasma changes in breast cancer patients during endocrine therapy — lipid measurements and nuclear magnetic resonance (NMR) spectroscopy (1995)
    Springer
    Breast cancer research and treatment 36 (1995), S. 287-297 
    Details
    ISSN: 1573-7217
    Keywords: aromatase inhibitor ; breast cancer ; endocrine therapy ; NMR spectroscopy ; plasma lipids ; tamoxifen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Side-effects following long-term endocrine therapy might have clinical implications. The aim of this study was to study potential methods to detect effects on plasma induced by hormonal therapies. The composite methylene (chemical shift between 1.2-1.4 ppm) and methyl (0.8-0.9 ppm) aliphatic peaks of the1H magnetic resonance spectrum (500 MHz) were analyzed in consecutive plasma samples of 23 cancer patients drawn before and during treatment with hormonally acting drugs. The aliphatic peaks were analyzed for line width at half-height and then averaged. In addition,13C magnetic resonance spectroscopy (125 MHz) analyses were done in selected patients. The blood samples were analyzed for triglyceride, cholesterol, apolipoprotein A1 (apo A1), and apolipoprotein B (apo B) levels. The methylene line width increased significantly after 9 weeks of tamoxifen (41.4 vs. 37.6 Hz). A trend of differences was observed in the saturated part of the13C magnetic resonance spectrum. A significant decrease in total cholesterol (mean decrease, 13%), increases in apo A1 (9%) and in the ratio of apo A1 to apo B (28%), but unchanged total triglycerides were found, indicating a decrease in LDL and increase in HDL lipoproteins in these patients following tamoxifen therapy. During dose escalation with the aromatase inhibitor exemestane, the methylene line width seemed to decrease (31.9 vs. 38.8 Hz, at 12 weeks and baseline, respectively). Significant decreases in total (13%) and HDL (32%) cholesterol, apo A1 (25%), and total triglyceride (16%) levels were found during the same interval. The apo A1/apo B ratio decreased by 25%. For patients on dexamethasone, the proton aliphatic line widths increased one day after the initiation of therapy. The changes in line shape observed during dexamethasone therapy indicated lower levels of triglyceride-rich relative to triglyceride-poor lipoproteins, consistent with results from the lipid analyses. In conclusion, nuclear magnetic resonance spectroscopy might have potential to detect effects on plasma induced by endocrine therapy. The lipid analyses in these patients were in support of the changes in lipid profile as evaluated by nuclear magnetic resonance spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713400
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  • 7
    Electronic Resource
    Electronic Resource
    Detection of dexamethasone in the cornea and lens by NMR spectroscopy (1999)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 237 (1999), S. 415-423 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  · Background: To study the penetration and metabolism of dexamethasone phosphate in the cornea and lens from rabbit following topical administration. · Methods: After topical administration of 0.1, 1 and 10% dexamethasone phosphate solutions, respectively, the cornea and lens were removed and extracted with either perchloric acid (PCA) or with chloroform/methanol to study the lipophilic and hydrophilic metabolites of the drug. The extracts were analyzed with 1H and 19F NMR spectroscopy. · Results: Using 19F NMR spectroscopy, both dexamethasone and dexamethasone phosphate were detected simultaneously in the extract of the cornea and lens obtained from the eyes denuded of the epithelium before the treatment. Using 10 and 1% drug solutions, the signals from dexamethasone were also detectable in the 1H NMR spectra among many endogenous metabolites. · Conclusion: 1H and 19F NMR spectroscopy was shown to be a useful method in the study of penetration and metabolism of dexamethasone in the eye, particularly because both the lipophilic and hydrophilic metabolites of the drug could be detected simultaneously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004170050253
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of trace amounts of polycylic aromatic hydrocarbons in soil (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 328 (1987), S. 569-571 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is described for the determination of polycyclic aromatic hydrocarbons in natural soil. The soil is dried and extracted by ultrasonic agitation with dichloromethane. The extract is purified by liquid-liquid partitioning with dimethylformamide, water and hexane followed by high performance liquid chromatography on a silica column. Quantitative analysis of the purified extract is carried out by combined gas chromatography/mass spectrometry. The method yields reliable results at the ng/g level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468970
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  • 9
    Electronic Resource
    Electronic Resource
    NMR and theoretical investigation of dicylopentadiene derivatives (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 298-303 
    Details
    ISSN: 0749-1581
    Keywords: 1H and 13C NMR ; spectra ; endo-Tricyclo[5.2.1.02,6]decane ; endo-Tricyclo[5.2.1.02,6]decan-2-ol ; 2-endo-Tricyclo[5.2.1.02,6]decanyl acetate ; Conformational composition ; Molecular mechanics and molecular orbital calculations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H and 13C NMR spectra of endo-tricyclo[5.2.1.02,6]deoane (1-H), endo-tricyclo[5.2.1.02,6]decan-2-ol (1-OH) and 2-endo-tricyclo[5.2.1.02,6]decanyl acetate (1-OAc) were assigned by the use of 1H—1H, 1H—13C and 13C—13C correlation spectra. The substituent chemical shifts were similar to those observed for the analogous norbornane derivatives.2 The flip angle of the five-membered ring and the conformational composition were estimated from the vicinal 1H—1H coupling constants. The results were compared with those from molecular mechanics calculations (MMPMI) and semi-empirical molecular orbital calculations (MNDO). The geometries obtained from the NMR data were close to those from the MMPMI calculations, and the calculated and observed energy differences were within ± 2 kJ mol-1 of each other. The endo conformation of the five-membered ring was found to be most stable for both 1-OH and 1-OAc. The MNDO calculation indicated a close to planar five-membered ring to be the most stable. This result could not be accommodated with the NMR data.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260300406
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  • 10
    Electronic Resource
    Electronic Resource
    Algal carotenoids 47For Part 46, see Phytochemistry 31, 1779 (1992).-NMR study of all-trans-peridinin, including complete 1H and 13C NMR assignments (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 1169-1177 
    Details
    ISSN: 0749-1581
    Keywords: Carotenoid ; All-trans-peridinin ; Conformation ; Relative configuration ; 2D COSY ROESY TOCSY ; 1H-detected ; 13C J-couplings NOE ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The allenic C37 skeletal carotenoid all-trans-(3S, 5R, 6R, 3′S, 5′R, 6′S)-peridinin, isolated from Amphidinium carterae by an improved isolation procedure, was subjected to a detailed 1H and 13C NMR spectroscopic analysis. Complete assignments of the 500.13 MHz 1H and 125.76 MHz 13C spectra, including determination of coupling constants and relative stereochemistry, were obtained by ID and 2D techniques. These included 1H—1H chemical shift correlated spectroscopy (2D COSY), phase-sensitive double-quantum COSY, difference 1D NOE experiments, 1D and 2D total correlation spectroscopy (HOHAHA, TOCSY) and 1D and 2D rotating frame nuclear Overhauser spectroscopy (ROESY, CAMELSPIN). The 13C NMR assignments were obtained through editing sequences (DEPT) and heterocorrelated 2D experiments. In particular, the 1H detected multiple bond 1H—13C correlated 2D experiment proved valuable for assignments of all 13 quatenary carbons together with 13 methine carbons in peridinin [C37H47O6(COCH3)]. Detailed analysis of the proton coupling constants supported the conformations and relative stereochemistry of the two end-groups. Spectral simulation of protons in the conjugated chain was necessary in order to ascertain more accurate chemical shifts for some protons in the strongly overlapping olefinic region. Variation in the trans double bond 3J(H, H) coupling was noted along the conjugated chain.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260301205
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