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  • Electronic Resource  (527)
  • 1970-1974  (527)
  • 1973  (527)
  • Analytical Chemistry and Spectroscopy  (485)
  • Life Sciences
  • 1
    Electronic Resource
    Electronic Resource
    Studies on mixed micelles of triton X-100 and phosphatidylcholine using nuclear magnetic resonance techniques (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 165-176 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The addition of the nonionic detergent Triton X-100 to aqueous phosphatidyl-choline dispersions converts the bilayer structures to mixed micellar structures containing Triton X-100. High-resolution nuclear magnetic resonance spectroscopy at 220 MHz was used to follow this conversion, and the general spectral characteristics of the mixed micelles are presented. The results are discussed in terms of the precise change in structure which occurs as Triton is mixed with the phospholipid bilayers, and it is concluded that, above a molar ratio of about 2:1 Triton to phospholipid, most or all of the phospholipid is in mixed micelles. The relevance of these results to the study of enzymes which require substrate in the form of micelles is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010302
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  • 2
    Electronic Resource
    Electronic Resource
    Protein composition of cell and forespore membranes of Bacillus subtilis (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 185-193 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: A sporulation mutant of Bacillus subtilis 168 was isolated and characterized. The mutant, designated SB-23, releases viable forespores at the end of the developmental period. Forespores were isolated on linear Renografin gradients and used as a source of forespore membranes. The protein composition of forespore membranes was found to differ from the protein composition of vegetative cell membranes by discgel electrophoresis. The results are discussed in relationship to morphological and physiological differentiation during bacterial sporulation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010304
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  • 3
    Electronic Resource
    Electronic Resource
    Masthead (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973) 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010401
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  • 4
    Electronic Resource
    Electronic Resource
    The fluid state of lecithin bilayers (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 281-284 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010405
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  • 5
    Electronic Resource
    Electronic Resource
    Synaptic vesicles: Structure of chromaffin granule membranes (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 295-306 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010407
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  • 6
    Electronic Resource
    Electronic Resource
    The membrane as transducer in peptide hormone action (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 356-359 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010413
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of cyclic AMP on membrane permeability (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 380-381 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010416
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  • 8
    Electronic Resource
    Electronic Resource
    A comparison of characteristic temperatures for transport in two unsaturated fatty acid auxotrophs of escherichia coli (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 535-544 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The rate of sugar transport as a function of temperature has been compared in two unsaturated fatty acid auxotrophs. One of these, the parent strain 30E, can β-oxidize the unsaturated fatty acid supplements, whereas the β-oxidation defective progeny strain 30Eβox- cannot. In a previous study, Arrhenius plots for transport of β-glucosides and β-galactosides by strain 30Eβox- revealed striking departures from linearity at both a lower and an upper characteristic temperatures. By electron spin resonance (esr) these temperatures were shown to correlate with the temperatures where the membrane lipids undergo a transition from a totally solid state to a solid-liquid equilibrium and from a solid-liquid equilibrium to a totally liquid state, respectively (1). In the present study with strain 30E we have made the following observations:1Arrhenius plots for transport rate are usually more complex, often revealing three characteristic temperatures. Two of these correlate with the upper and lower characteristic temperatures observed in strain 30Eβox-. The third characteristic temperature falls between the previously described upper and lower ones.2In cells supplemented during growth with elaidate, the third characteristic temperature was identical within experimental limits for both β-glucoside and β-galactoside transport. indicating that it is likely to arise from some interaction in the bulk lipid phase. This conclusion is supported by the fact that the boundary of a change in physical state is also observed at this temperature by electron spin resonance.3In cells supplemented during growth with oleate, two or three characteristic temperatures were observed depending upon the transport system studied. Although glucoside and galactoside transport had the same lower characteristic temperature, these systems had no common upper characteristic temperature.4In cells supplemented during growth with the lipid density label, bromostearic acid, three characteristic temperatures were observed for β-glucoside transport in both strains 30E and 30Eβox-.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010608
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  • 9
    Electronic Resource
    Electronic Resource
    Lipid-protein and lipid-lipid interactions in cytochrome oxidase model membranes (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 269-280 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Two lipid environments are detected in membranous cytochrome oxidase, using spin labeling techniques. This model membrane system consists of closed vesicular membranes formed spontaneously when the membrane protein is isolated with its accompanying phospholipids. The data show both an immobilized component, which is constant in amount, and a fluid component. Based on spectral analysis, the interpretation is that the bound component represents a single layer of lipid immobilized on the surface of the protein between the hydrophobic protein complex and the adjacent fluid bilayer regions. Maximal enzyme activity of this functional protein complex is attained when all of the bound sites are occupied, and above this level additional phospholipid (bilayer) has little or no effect on the enzyme activity.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010404
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamic properties and membrane activity of ion specific antibiotics (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 307-335 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Conformational rearrangements of membrane-active peptide and depsipeptide antibiotics such as enniatin B, valinomycin, and valine-gramicidin A have been studied as a function of solvent polarity employing ultrasonic absorption methods. The results provide information about the number of occupied conformational states and their respective rates of interconversion. The interpretation of the results from kinetic measurements was confirmed by spectroscopic studies.The remarkable differences in the stabilities of the various cation complexes of depsipeptide antibiotics bound to lecithin vesicles as well as in homogeneous solution were related to different conformations of the ligands in these complexes as characterized by spectroscopic techniques. Kinetic studies by relaxation methods led to the elucidation of the mechanism of complex formation. Complexation of cations follows a multistep reaction. For valinomycin the rate-limiting step of cation complexation is a ligand conformational change which occurs during the stepwise substitution of solvent molecules from the cation.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010408
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  • 11
    Electronic Resource
    Electronic Resource
    Purification and properties of the sodium-potassium transport adenosinetriphosphatase from the rectal gland of the spiny dogfish squalus acanthias (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 336-347 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The (Na + K)-activated adenosinetriphosphatase (NaK ATPase) has been purified from Lubrol extracts of membranes from the rectal glands of Squalus acanthias. The specific activity of the purified enzyme is 2 to 3 times that previously reported by others after correction of their specific activities for detergent activation. The yield of the enzyme from the membranes is 70%. The enzyme is highly stable both at 0° and in the frozen state. Ninety-five percent of the enzyme consists of two subunits-the catalytic subunit with a MW of 97,000 and a glycoprotein with a MW of 55,000. At the last stage of purification the enzyme reverts to various membranous forms: the thickness of the membrane is about 80 Å; projections (probably the glycoprotein) of about 40 Å in diameter are seen at regular intervals.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010409
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  • 12
    Electronic Resource
    Electronic Resource
    Adenylate cyclase and cyclic AMP phosphodiesterase of normal and rous sarcoma virus transformed chicken embryo fibroblasts (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 382-384 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Cyclic AMP appears to regulate cell growth. Cyclic AMP levels are high in normal chicken embryo fibroblasts and drop to very low levels when the cells are transformed by the Bryan high-titer strain of Rous sarcoma virus. Cells infected with a temperature-sensitive mutant of the virus have normal levels of cyclic AMP at the nonpermissive (nontransforming temperature), but when the cells are shifted to the permissive (transforming) temperature the cyclic AMP levels rapidly fall to values that are found in transformed cells. Studies on the adenylate cyclase and cyclic AMP phosphodiesterase in normal and transformed chicken embryo fibroblasts have shown that the adenylate cyclase is greatly decreased in the transformed cells whereas the phosphodiesterase is increased. The decrease in adenylate cylcase activity is the result of an increase in the Km of the substrate and a loss of a magnesium ion activator site. The increase in phosphodiesterase activity is the result of an increase in total phosphodiesterase activity and a decrease in the negative cooperativity of plasma membrane bound phosphodiesterase. Thus the fall in cyclic AMP levels that occurs on transformation can be correlated with changes in the activity of adenylate cyclase and cyclic AMP phosphodiesterase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010417
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  • 13
    Electronic Resource
    Electronic Resource
    Fluorescence and circular dichroism studies on human serum low density lipoprotein particles and lipid-depleted derivatives (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 177-184 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The low density liporpotein from human serum, and derivitives prepared free of neutral lipids and total lipids, have been studied by fluorescence and circular dichorism methods. Removal of the neutral lipids had little effect on the tryptophan fluorescence at neutral pH. However, by the criteria of circular dichroism, over the range of 200 nm to 250 nm, there was a reduction in secondary structure of over 75%. Removal of the remaining phospholipids resulted in a qualitatively different structure by both fluorescence and circular dichroism criteria.Neutral lipids were removed from LDL in a step-wise fashion in order to determine the exact amount of neutral lipid required for the native circular dichroism spectrum. The circular dichroism band intensity was constant until approximately 10% of the total cholesterol (as cholesterol ester) remained. The intensity then abruptly dropped as more cholesterol was removed.We concluded that the two spectroscopic methods report on two distinct aspects of LDL structure. The tryptophan fluorescence appears to be sensitive to the presence of phospholipids. The circular dichroism, however, appears to be sensitive to the binding of a small amount of neutral lipid. These findings suggest that a functional and geometric separation of binding sites may exist for these two classes of lipids. Such a distinction is predicted by the icosohedral model of the quaternary structure of LDL. In this model, the phospholipids are located on the surface of the particle, in the holes of an icosohedrally symmetric surface network of protein subunits; the neutral lipids are located in the particle core.Finally, we suggest that functional significance may be attached to our finding that relatively few cholesterol ester molecles are needed to maintain the native secondary structure of LDL. This provides a mechanism whereby the amount of bound neutral lipid could be raised or lowered (for transport and transfer to cells) without affecting the protein in any structurally significant manner.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010303
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  • 14
    Electronic Resource
    Electronic Resource
    Magnetic resonance studies on membrane and model membrane systems (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 255-255 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010310
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  • 15
    Electronic Resource
    Electronic Resource
    Selective solubilization of proteins and phospholipids from red blood cell membranes by nonionic detergents (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 233-248 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Treatment of isolated human erythrocyte membranes with Triton X-100 at ionic strength ⋍0.04 preferentially released all the glycerolipid and glycoprotein species. At low ionic strength, certain nonglycosylated polypeptides were also selectively solubilized. The liberated polypeptides were free of lipids, but some behaved as if associated into specific oligomeric complexes. Each detergent-insoluble ghost residue appeared by electron microscopy to be a filamentous reticulum with adherent lipoid sheets and vesicles. The residues contained most of the membrane sphingolipids and the nonglycosylated proteins. The polypeptide elution profile obtained with nonionic detergents is therefore nearly reciprocal to that previously seen with a variety of agents which perturb proteins. These data afford further evidence that the externally-oriented glycoproteins penetrate the membrane core where they are anchored hydrophobically, whereas the nonglycosylated polypeptides are, in general, bound by polar associations at the inner membrane surface. The filamentous meshwork of inner surface polypeptides may constitute a discrete, self-associated continuum which provides rather than derives structural support from the membrance.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010308
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  • 16
    Electronic Resource
    Electronic Resource
    The differentiation of rat liver endoplasmic reticulum membranes: Apo-cytochrome P450 as a membrane protein (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 471-489 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The proteins of washed microsomal membranes from adult rat liver were solubilized by 2% SDS and electrophoresed on polyacrylamide gels. Confirming earlier reports, a large Coomassie-Blue staining band in the ∼50,000 MW region was identified as cytochrome P450 by four criteria: similar electrophoretic mobility to a purified cytochrome P450 preparation, an increase in this band after in vivo phenobarbital administration, a decrease in this band after in vivo allylisopropylacetamide administration, and direct specific binding of added purified heme to this region of a washed, unfixed gel. Although cyt P450 is not spectrally evident until just at the time of birth of the rats, a large band in this region was detectable in gels of microsomal membrane protein at all times, from three days before birth onward; this band also bound added heme after membrane proteins from fetal rat liver microsomes were electrophoresed on the gels. The conclusion was that apo-cyt P450 is present in microsomal membranes at these times during differentiation, and that, regarding this protein, during differentiation heme is bound to the apo-protein already there, concomitant with a synthesis of more cyt P450 molecules. The process of differentiation of this membrane type is also discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010604
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  • 17
    Electronic Resource
    Electronic Resource
    Correlations between fatty acid distribution in phospholipids and the temperature dependence of membrane physical state (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 523-534 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Cytoplasmic membranes of an unsaturated fatty acid auxotroph of Escherichia coli have been studied using spin labeled hydrocarbon probes. These studies reveal that the membrane lipids undergo changes of state at critical temperatures which reflect the physical properties of the fatty acid supplement supplied to the cells during growth. The critical temperatures observed in spin labeled membranes correlate with characteristic temperatures in membrane functions. Lipid analysis reveals that fatty acid composition and distribution in membrane phospholipids are primary determinants of the temperatures at which changes of state are observed in membrane lipids. Fatty acid composition and distribution can also produce unique interactions between certain spin label probes and their lipid environment.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010607
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  • 18
    Electronic Resource
    Electronic Resource
    Electrochemical interactions at the endothelial surface (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 417-436 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010420
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  • 19
    Electronic Resource
    Electronic Resource
    Masthead (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973) 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010301
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  • 20
    Electronic Resource
    Electronic Resource
    Selective solubilization of proteins from red blood cell membranes by protein perturbants (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 220-232 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Isolated human erythrocyte membranes were exposed to a series of reagents known to modify or perturb proteins; these included sodium hydroxide, lithium diiodosalicylate, acid anhydrides, and organic mercurials. Each reagent liberated the same set of relatively polar polypeptides from the membrane, while the other, more hydrophobic species invariably remained associated with the membrane residue. The selective elution pattern was precisely that seen previously with 6 M guanidine hydrocloride. The released polypeptides, comprising half of the membrane protein mass, contained no carbohydrate; current evidence indicates that all of these components are confined to the cytoplasmic surface of the membrane. The residue contained all the lipids and all the glycoproteins. The latter are accessible to the outer membrane surface and, in at least two cases, seem to extend asymmetrically across the thickness of the membrane. Thus, the distinctive elution behavior which defines these two groups of polypeptides relates both to their chemical composition and their organizational disposition in the membrane.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/jss.400010307
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  • 21
    Electronic Resource
    Electronic Resource
    Isolation and characterization of a protease inhibitor from commercial stem bromelain acetone powder (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 249-254 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Seven closely related protease inhibitors were isolated from commercial bromelain acetone powder in electrophoretically pure form by gel filtration on Sephadex G-75, followed by ion exchange chromatography on DEAE Sephadex at pH 7.55. The inhibitors are proteins of MW 5000-6000, which inhibit competitively the bromelaincatalyzed hydrolysis of CLN (Ki ≈ 10-7 M). This inhibition is optimal at pH 3 to 4,. and it depends upon the ionization of two acidic residues of pK = 4.5 and 5.0. In the acidic pH range the inhibitors are also effective toward papain, ficin and trypsin.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/jss.400010309
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  • 22
    Electronic Resource
    Electronic Resource
    Multiple forms of porcine pancreatic phospholipase A2: Isolation and specificity (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 490-497 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Porcine pancreatic phospholipase A2 was purified from commercial pancreatin by a method involving heat denaturation, trichloroacetic acid precipitation, and DEAE-cellulose chromatography. Assaying the eluate of the chromatography step by a new titrimetric method using vegetable lecithin-albumin emulsion as the substrate, several species of phospholipase A were found. Some of these went undetected when the conventional egg yolk emulsion assay was used. Two phospholipases A2 were isolated in a homogeneous form and shown to have similar chemical and physical properties. Catalytic specificity of the two enzymes differs remarkably toward lecithins in different emulsified states.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010605
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  • 23
    Electronic Resource
    Electronic Resource
    Structural studies on the organization of proteins in mitochondrial membranes using proteolytic enzymes (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 194-207 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Proteolytic enzymes, pronase and trypsin, digest protein in ETP and in SU-particles (devoid of the soluble ATPase) at similar rates and to the same extents for intact and lipid-depleted membranes, showing that lipids do not constitute a barrier to the action of the proteases. The rates and extents of hydrolysis are slightly depressed when membranes are reconstituted from lipid-depleted particles and phospholipids. The hydrolysis rates for the various particles are not greatly enhanced by detergent solubilization nor by other denaturing treatments, indicating that the rates measured in absence of treatments are maximal under the conditions used. The circular dichroism spectra of pronase treated ETP are noticeably altered showing modification of the original conformation. Moreover, enzymic activities of mitochondria and submitochondrial particles are progressively affected by proteases according to their localization at, or near to, a given surface of the membrane. The matrix enzyme, malate dehydrogenase, is not apparently released from mitochondria during the initial incubation period. The results are tentatively discussed in terms of organization of lipids and proteins in the mitochondrial membrane.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010305
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  • 24
    Electronic Resource
    Electronic Resource
    Masthead (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973) 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010601
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  • 25
    Electronic Resource
    Electronic Resource
    Structural requirements for mitochondrial mutagenesis (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 449-460 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Ethidium bromide (3, 8-diamino-5-ethyl-6-phenylphenanthridinium bromide) and euflavine (3, 6-diamino-10-methylacridinium chloride) are superficially similar in structure and ability to intercalate into DNA. However, they exhibit qualitative differences in their ability to bring about a mitochondrial mutation (ρ+ → ρ-) in Saccharomyces cerevisiae. This investigation tried to establish and compare the essential structural prerequisites in three series of planar, heterocyclic dyes: the phenanthridines (P series), the acridines (A series), and molecules with different heteroatoms related to acridines (X series). Compounds capable of bringing about the mutation in the complete absence of growth and energy sources are restricted to di-primary amines in the P series: quaternization of the ring nitrogen, and an aromatic side chain at C-6 also appear essential. Compounds in the A series are mutagenic only with growing cells; quaternization (C1 through C4) is essential. The 10-allyl derivative is unusual; it is highly effective even in buffer supplemented only with an energy source. The results are interpreted in terms of a model that requires interaction of the mutagen with the mitochondrial inner membrane as well as with its DNA.
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    A study of the structure of the T-layer of bacillus brevis (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 498-522 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Additional Material: 10 Ill.
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    URL: http://dx.doi.org/10.1002/jss.400010606
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    Membrane assembly in escherichia coli V. Subcellular localization of phospholipid biosynthesis (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 545-564 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The subcellular distribution of enzymes involved in lipid biosynthesis in E. coli K12 has been studied following various modes of cell disruption and fractionation of the subcellular components. Though most biosynthetic enzymes were found associated with the cytoplasmic membrane fraction regardless of the procédures of disruption or fractionation employed, the enzymes responsible for the synthesis of the major lipid of E. coli (phosphatidylethanolamine) and of its precursor (phosphatidylserine) had no distinct localization in extracts. These findings are discussed in the context of current models for the assembly of bacterial membranes.
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    The β-glucoside system of Escherichia coli III. Properties of A P-HPr: β-Glucoside phosphotransferase extracted from membranes with detergent (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 565-587 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: A P-HPr:β-glucoside phosphotransferase (enzyme IIbgl)The nomenclautre of the enzymes II is that suggested by Lin (1) has been extracted from membranes of a β-glucoside fermenting strain of Escherichia coli K 12 using the nonionic detergent Triton X-100. The extracted enzyme was rendered virtually free of both lipid and detergent by chromatography on DEAE-cellulose. At this stage, the partially purified enzyme had negligible activity, but activity was restored effectively by the addition of (1) nonionic detergents of the Tween or Triton series and (2) crude E. coli phospholipids or an anionic lipid enriched fraction, but not phosphatidylethanolamine. Detergent activators were most effective at or near the critical micelle concentration, but were inhibitory when added at concentrations above the critical micelle concentration.In order to obtain maximal initial rates of phosphotransferase activity, it was necessary to incubate the extracted, partially purified enzyme with detergent activator and HPr prior to the addition of the other assay system components. High detergent concentration inhibited the initial rate of phosphorylation by interfering with an essential step (or steps) that occur during this preliminary incubation. The activation occuring during the preliminary incubation was also highly temperature dependent; a precipitous decrease in activation was detected below 16° when Tween 40 was employed as the detergent activator.Phosphorylation mediated by the membrane associated form of the phosphotransferase was not influenced by the physical state of the lipid components of the membrane. This is in marked contrast to the properties of the phosphorylation reaction mediated by the phosphotransferase in intact cells.
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    Circular dichroism of biological membranes-brain microsomesNumber V in the series “Circular Dichroism of Biological Membranes.” (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 259-268 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The circular dichroism and absorption spectra of particulate and solubilized brain microsomes are reported. The corrected molar ellipticity for the membrane suspension was -1.1 × 10+4, between the values of axonal and oxyntic cell membranes and those for sarcotubular vesicles. No conformational change was detected which correlated unambiguously with the active cation transport function of these microsomes. Divalent cations, however, elicited a significant change in the membranes' ultra structure. Correction of suspension data for the NaI microsomes with and without sonication gave virtually identical values providing optimism for the corrections used and validating the difference in corrected values for ths suspension with and without magnesium. This indicates that, in addition to causing a change in the state of aggregation, 2 mM magnesium ion may reasonably be considered to effect a change in protein conformation.
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    Lateral phase separations in membranes (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 285-294 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Lateral phase separations of phospholipids in both bacterial membranes and model membrane systems (phospholipid bilayers) can be studied using spin labels. Temperature-composition phase diagrams have been determined for binary mixtures of lipids dispersed in excess water by measurements of changes in the fluidity of the membranes as a function of temperature. These results have been used to interpret similar fluidity changes in bacterial membranes. There is evidence that the coexistence of fluid and solid lipid domains facilitates transport through membranes.
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    Lateral diffusion of rhodopsin in the visual receptor membrane (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 354-354 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: If the rhodopsin on one side of an isolated rod outer segment is suddenly bleached, the rhodopsin on the other side can be observed with a microspectrophotometer to diffuse rapidly across the width of the rod. Uniform distribution is approached exponentially with a half-time at 20°C of 23 ± 3 sec in rods isolated from mudpuppy (Necturus maculosus) retina and 35 ± 3 sec in rods isolated from frog (Rana catesbeiana) retina. These rods are 12 and 8 μ in diameter, respectively. Taking the geometry of the rod disk membranes into account, we obtain a lateral diffusion constant for rhodopsin in the disk membrane of (4.0 ± 1.5) × 10-9 cm2/sec for both mudpuppy and frog. No diffusion was observed if rods were first fixed with glutaraldehyde. The diffusion constant increased with temperature with a Q10 between 2 and 4 in the temperature range near 20°C. If the effective diameter of rhodopsin is assumed to be about 50 Å, the Stokes-Einstein relationship implies the effective viscosity for lateral diffusion of rhodopsin is about 2 poise. This value, as well as the Q10, are essentially the same as indicated by the rapid rotational diffusion of rhodopsin previously observed by flash photometry in frog rods.Cone, R. A., Rotational Diffusion of Rhodopsin in the Visual Receptor Membrane, Nature (London) New Biology, 236:39 (1972).
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    An abrupt temperature-dependent change in the energy of activation of hormone-stimulated hepatic adenylyl cyclase (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 368-379 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: 1In the stimulation of rat hepatic adenylyl cyclase by glucagon or epinephrine we observe an abrupt change in the energy of activation at 32°C (seen as an increase in the slope of the Arrhenius plot). The energy of activation for the cyclase reaction above 32°C is about 1.7 times that found below this temperature. Cyclase activity stimulated by fluoride, prostaglandin E1, or 1-propanol, or activity in the absence of added stimulators does not show this change. The structural differences between the hormones suggest that they interact with the cyclase system at different loci. But the mechanism by which they stimulate cyclase activity appears to involve a common, temperature-dependent step.2In the presence of 1-propanol the change at 32°C in the energy of activation of the hormone-stimulated activity is not observed.3In view of the relatively large mole fraction of cholesterol present in the rat liver plasma membrane (which appears to inhibit phase transitions in bulk membrane lipids), it is suggested that this thermal sensitivity resides in protein rather than lipid components or that the cyclase is restricted to cholesterol-poor membrane regions.4The occurrence of anomalous Arrhenius plots of enzyme activities (with abrupt changes of slope) for both membrane-bound and soluble enzymes is reviewed.
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    Cis- and trans- membrane control of cell surface topography (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 410-416 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The topographic distributions of cell surface components can be modified by perturbations from the cell membrane exterior (cis-membrane effect) or by perturbations from the cell interior that are transferred across the membrane (trans-membrane effect). Using the human erythrocyte ghost as a model system, cis-membrane effects on the topography of anionic sites were produced in B+ ghosts with anti-B sera (but not with anti-A), R. communis agglutinin and concanavalin A (but not with D. biflorus agglutinin). Cis-membrane linkage was monitored by the state of aggregation of membrane-bound colloidal iron hydroxide particles which bind almost exclusively to neuraminidase-sensitive N-acetylneuraminic acid residues on the outer surface. Trans-membrane effects were observed when purified antibodies against an inner surface membrane protein, spectrin, were sequestered inside the ghosts. The sequestered antispectrin bound to spectrin at inner membrane surface and caused aggregation of the anionic sites on the outer membrane surface. The trans-membrane effects of antispectrin required intact γG antibodies (Fab would not substitute) and was time- and concentration-dependent.
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    Colicin Ia and Ib binding to Escherichia coli envelopes and partially purified cell walls (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 208-219 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The specific binding of 125 Iodine labelled colicin Ia and Ib to Escherichia coli cell envelopes and partially purified cell walls is demonstrated. Neither partially purified cytoplasmic membranes isolated from a wild type sensitive strain nor envelopes or cell walls prepared from an E. coli mutant known to be defective in the colicin I receptor could bind the colicins. Competition studies suggest that colicins Ia and Ib have a common bacterial receptor which resides in the bacterial cell wall.
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    URL: http://dx.doi.org/10.1002/jss.400010306
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    The salt-extractable fraction of dynein from sea urchin sperm flagella: An analysis by gel electrophoresis and by adenosine triphosphatase activity (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 461-470 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Previous work has shown that the dynein from axonemes of sea urchin sperm consists of two distinct fractions which differ substantially in their extractability by salt. Upon gel electrophoresis of whole demembranated axonemes solubilized with sodium dodecyl sulfate, the dynein fraction shows two closely spaced bands with apparent molecular weights of 520,000 and 460,000; the proteins in these bands are termed the A and B components of the dynein. Similar electrophoresis of the soluble fraction obtained by extracting the axonemes with 0.5 M NaCl shows a single prominent band containing approximately half of the A component of the dynein (A1 component). The residue of extracted axonemes contain the other half of the A component of the dynein (A2 component) and all the B component. Densitometry of the bands indicates that the A1, A2 and B components of the dynein are present in approximately equal molar quantity. Electron microscopic studies show that the A1 component of the dynein constitutes the outer arms on the doublet tubules. Assay of ATPase activity in 0.05 M KCl and l mM ATP indicates about 65% of the total ATPase activity becomes soluble when the A1 component of the dynein is extracted with salt.
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    Erratum (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 588-588 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
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    URL: http://dx.doi.org/10.1002/jss.400010611
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    Preface (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 257-258 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
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    URL: http://dx.doi.org/10.1002/jss.400010402
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    Conformational aspects of rhodopsin and retinal disc membranes (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 348-353 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: We have used two experimental approaches - fluorescence spectroscopy and lectin binding - to obtain information about the structure of rhodopsin and its position in retinal disc membranes. Energy transfer was used as a spectroscopic ruler to deduce proximity relationships in rhodopsin and in disc membranes. Concanavalin A and wheat germ agglutinin served as specific macromolecular probes of the accessibility of the carbohydrate unit of rhodopsin in disc membranes. We infer from these studies that: (1) The rhodopsin molecule is at least 75 Å long and has an elongated shape. (2) There may be distinct hydrophobic and hydrophobic and hydrophilic domains in rhodopsin. (3) The carbohydrate moiety of rhodopsin is on the surface of the disc membrane, probably only on the external face. (4) The disc membrane has an asymmetric structure. (5) The external surface of the disc membrane is closer to site A (a sulfhydryl residue on rhodopsin) than to 11-cis retinal.
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    Biochemical studies on torpedo californica acetylcholine receptorsThis research was supported by USPHS Grant NS-10294 and a grant from the Sloan Foundation. (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 360-367 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Additional Material: 6 Ill.
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    URL: http://dx.doi.org/10.1002/jss.400010414
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    Rhodopsin-lipid interactions (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 355-355 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Purified, lipid-free rhodopsin has been incorporated into bilayers of natural and synthetic phosphatidyl cholines and a natural digalactosyl diglyceride. Successful incorporation and high regenerability of rhodopsin appears to depend on the nature of the hydrocarbon chains and not specifically on the type of polar head group of the lipids.Electron paramagnetic resonance spectra of recombinant membranes containing small amounts of spin labeled phosphatidyl cholines reveals that rhodopsin interacts directly with the hydrocarbon chains of the phospholipids in the bilayer, resulting in a dramatically decreased motional freedom of the chains.In studies of the recombinant membranes using freeze-fracture electron microscopy, the presence of rhodopsin is detected as discrete particles in the plane of fracture. The particle distribution is dependent on the nature of the lipid hydrocarbon chains and whether or not the rhodopsin has been photolyzed.From these studies, it is concluded that the rhodopsin-bilayer structure is stabilized primarily by direct interaction of the hydrocarbon chains with the protein molecule, and that structural parameters in this model system are subject to modulation by visible light.
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    Red cell aggregation by macromolecules: Roles of surface adsorption and electrostatic repulsion (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 385-409 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Aggregation of normal and neuraminidase-treated human red blood cells (RBC) by dextrans of various molecular sizes and concentrations was quantified by microscopic counting and light reflectometry. The influences of variations in the ionic strength and the cationic valency of the dextran solution on RBC aggregation were also investigated. The data on RBC aggregation were correlated with measurements of the zeta potential by cell electrophoresis and the intercellular distance in the rouleaux by electron microscopy. With the use of the classical equations and newly developed knowledge in colloid chemistry, the electrostatic repulsive force between adjacent cell surfaces (Fe) was calculated from the experimental data. The macromolecular bridging force causing RBC aggregation (Fb) has also been derived as a function of dextran concentration. Other forces that cause RBC disaggregation are the mechanical shearing force (Fs) and the RBC membrane bending force (Fm). The net force for RBC aggregation is equal to Fb - Fe - Fm - Fs. This model of aggregation involving force balance at the surface can explain known experimental results on factors influencing cell aggregation. It is proposed that such force balance between cell surfaces may be applicable in other cell or particulate systems and that it may be of fundamental importance in many physiological functions.
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    The surface chemistry of the erythrocyte and thrombocyte membrane (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 437-447 
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    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The electrokinetic procedures used for investigation of the nature and distribution of cellular surface charge groups are outlined. The application of ion binding studies, the action of enzymes, and the effects of specific functional group reagents are illustrated by discussion of the results obtained for erythrocytes and thrombocytes. The human erythrocyte has been shown to be a macropolyanion possessing about 107 charged groups per cell of which more than 60% are the carboxyl group of N-acetylneuraminic acids; some of the remaining groups at least are the α-carboxyl groups of protein-bound amino acids. The electrokinetic constitution of the human blood platelet is more complex and includes sialic acid carboxyl groups and phosphate groups and at least one other species of unidentified anionogenic groups as well as amino groups. Lastly the effects of neutral and charged polymer adsorption on the electrokinetic properties of blood cells are briefly considered.
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    Moseley and the numbering of the elements. B. Jaffe. Science Study Series, Doubleday: New York. $1.95 (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 2 (1973), S. A21 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300020412
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    News and events (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 2 (1973), S. A22 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300020414
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    NMR stereotopic induced shifts in epimeric mixturesContribution No. 377 from the Instituto de Química, UNAM. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 291-293 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton NMR spectra of epimeric mixtures of menthone (1), carvomenthone (2), carquejone (3), 2,5-dimethyl-1,4-cyclohexanedione (4) and piqueridione (5) were studied using the chemical shift reagent Eu(DPM)3. The results allow quantifications of the epimers and some conformational assignments to be made.
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    The effect of solute concentration on the chemical shift of aromatic compounds. Some studies using 1-iodonaphthalene as a model compound (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 321-325 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The change in chemical shift with solute concentration (dilution effect) has been determined for a model compound - 1-iodonaphthalene - in cyclohexane and carbon tetrachloride. The data and assignments for this compound differ from those of previous work. A simple model is proposed to account for dilution shifts in aromatic solutes and their sensitivity to proton position. Solvent shifts are also discussed.
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    URL: http://dx.doi.org/10.1002/mrc.1270050704
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    Der Einfluss des anomer verknüpften Adeninrestes auf die 13C-chemischen Verschiebungen von Pyranosen (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 311-319 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The influence of the anomeric attached adenine residue on the 13C chemical shifts of aldopyranose carbons is discussed for a series of pyranosyl adenines. The anomeric carbons with an axially oriented heterocycle always resonate at higher field than the corresponding ones with an equatorial orientation. This rule can be used for the determination of the pyranose conformation. Substituting the anomeric hydroxyl group by an adenyl residue causes deshielding on C-5 of the pyranose residue.
    Notes: Der Einfluß des anomer verknüpften Adeninrestes auf die 13C-chemischen Verschiebungen von Aldopyranosen wird für eine Reihe von Pyranosyladeninen diskutiert. Anomere Kohlenstoffatome mit axial verknüpftem Heterocyclus absorbieren stets bei höherem Feld als entsprechende mit äquatorial orientiertem Adenin. Diese Regel kann zur Bestimmung der Pyranosekonformation verwendet werden. Wird die anomere Hydroxylgruppe durch einen Adeninrest ersetzt, dann verschiebt sich die Resonanz von C-5 des Pyranoserestes nach tieferem Feld.
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    URL: http://dx.doi.org/10.1002/mrc.1270050703
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  • 48
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    Studies in nuclear magnetic resonance - XII: Complete analysis of the proton spectra of tert-butylcyohexane-3,3,4,4,5,5-d6 and -3,3,5,5-d4 (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 333-338 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Accurate parameters for the two title compounds have been obtained by the aid of a spectral subtraction technique in conjunction with analysis by LAOCN3. It is observed that J1eq, 6eq and J1ax, 2ax are abnormally large and small, respectively, and the significance of these and other coupling constants are discussed in terms of the probable geometry of tert-butylcyclohexane. The tert-butyl group affects the chemical shifts of the 4-protons, indicating that tert-butylcyclohexyl derivatives are poor models for fixed conformers of monosubstituted cyclohexanes. The deuterium isotope effects on proton chemical shifts appear to be influenced by the same factors as proton-proton coupling constants.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050706
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  • 49
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    CIDNP of 13C and 1H nuclei in the reactions of cyclohexadienone carbenesPaper presented at the International Symposium on Chemically Induced Dynamic Polarisation of Nuclei and Electrons, Tallinn, Estonian SSR, 13th to 16th August 1972. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 339-342 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal decomposition of 4-diazo-2,6-di-tert-butyl-2, 5-cyclohexadien-1-one in perhalogenated solvents has been investigated. The decomposition reaction proceeds via a carbene intermediate first to a singlet and then to an effectively triplet free encounter radical pair formed in a halogen abstraction reaction. The polarisation of the stable reaction product is determined by competing processes in the primary cage, intersystem crossing and escape from the cage.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050707
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  • 50
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    Relation between the carbon chemical shifts and the J(CH) spin-spin coupling constants (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 351-352 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050710
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    NMR and chemistry, by J. W. Akitt, Chapman and Hall, London, 1973. pp. ix + 182. £1.90 (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. A6 
    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.1270050712
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  • 52
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    Sur les complexes formés par le trifluorure de bore avec les sulfoxydes, aminoxydes, phosphinoxydes et arsinoxyde: Aspects généraux des spectres de RMN (1H, 11B, 19F et 31P) (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 357-360 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Various complexes (RnMO·BF3) of boron trifluoride with sulphoxides, aminoxides, phosphinoxides and arsinoxides have been prepared and investigated using proton, fluorine (at variable temperature) boron and phosphorus resonance. A comparison with similar adducts containing a co-ordinative O—B bond is presented.
    Notes: Les spectres de résonance magnétique nucléaire (1H, 11B, 19F et 31P) des complexes RnMO·BF3 formés par le trifluorure de bore et des sulfoxydes, aminoxydes, phosphinoxydes et arsinoxydes ont été obtenus. Les paramètres (déplacements et couplages) caractérisant ces spectres sont comparés à ceux de composés similaires renfermant également une liaison de coordination O·B.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050803
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973) 
    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.1270050101
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  • 54
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    Two-frequency spin echo in molecular crystals (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 1-3 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The two-frequency pulse response of a multilevel system in NQR is investigated. Additional spin echo signals are shown to appear. The application of the two-frequency spin echo method to some of the crystals is demonstrated. The method is of great value for the investigation of local fields in crystals.
    Additional Material: 6 Ill.
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  • 55
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    Hammett correlation and chemical shift parameters of the methine proton in some 9-phenyl octahydroxanthenesContribution No. 349 from the Instituto de Química, UNAM. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 5-6 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Hammett σ values for para E (-) Substituents in 9-Phenyl octahydroxanthene outweigh the inductive and resonance effects acting on the methine proton.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050103
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  • 56
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    The proton magnetic resonance spectrum of 4-t-butyl-5, 6-dihydro-4H-pyran (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 7-8 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton magnetic resonance spectrum of 4-t-butyl-5,6-dihydro-4H-pyran has been analyzed with the aid of the paramagnetic shift reagent Eu(fod)3. All hydrogen-hydrogen spin-spin coupling constants are reported and a conformation is suggested which is consistent with these data.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050104
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  • 57
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    The NMR spectra and conformations of cyclic compounds-VIIIFor Part VII, see Ref. 1.. Car-3-ene (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 515-516 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 220 MHz PMR spectrum of car-3-ene (3,7,7-trimethylbicyclo[4,1,0]hept-3-ene) is interpreted and a conformation deduced. In contrast to previous work, which has discussed a highly buckled structure for the 6 membered ring, the present work finds this ring to be essentially planar.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270051104
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    Stéréochimie de β-diols et de leurs dérivés cycliques-VIPartil V: voir Réf. 46. Calcul empirique des déplacements chimiques en série dioxannique. Détermination et discussion des incréments de calcul (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 517-522 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In order to calculate empirically proton chemical shifts in methyl 1,3-dioxans, the basic values for each proton of 1,3-dioxan itself are estimated. Then, using methyl derivatives in the chair conformation, the Δδ primary effects of methyl groups in any position are given. Modifications take place in molecules with butane gauche interactions and these secondary effects are evaluated. Analogous Δδ in both the cyclohexane and dioxane series are related to similar cyclic geometry. The presence of oxygen atoms however, introduces important discrepancies.
    Notes: Afin de calculer empiriquement les déplacements chimiques des protons de dioxannes-1,3 méthylés, nous avons tout d'abord dégagé les valeurs de base du déplacement chimique de chaque proton du dioxanne-1,3. ensuite, en utilisant des dérivés méthylés en conformation chaise, nous avons établi une systématique effets Δδ des groupes méthyles en position quelconque.Pour certaines molécules, présentant notamment des interaction gauches, ces divers effts peuvent être modifiés, et nous avons é ces perturbations. L'analogie de Δδ entre les deux séries dioxannique et cyclohexanique a été rapprochée d'une similitude de gémétrie des cycles. Cependant la présence des atomes d'oxygène introduit des différnces parfois importantes.
    Additional Material: 4 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270051105
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  • 59
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    Solvent effects on the proton magnetic resonance spectra of p-substituted phenyltin chlorides (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 529-532 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A PMR study of solvent effects on some p-substituted phenyltin chlorides (substituents = CH3, (CH3)3C, CH3O) is reported. Co-ordination of solvent molecules to the tin atom leads to an unusual low field shift of the o-ring protons. The results for p-tolytin trichloride have been compared with those for p-tolylsilyl trichloride and discussed. In o-, m- and p-tolyltin trichlorides long range spin-spin couplings between the ring methyl protons and the tin atom have been observed. The order of magnitude is o- 〉 p- 〉 m-methyl protons.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270051107
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    Chemical shifts of aromatic protons in di-n-alkyl ortho-phthalates: Effect of dipolar interactions in a binary system, ester - carbon tetrachloride (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 549-549 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270051111
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973) 
    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.1270051201
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  • 62
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    13C and 1H NMR spectroscopic studies on the structure of N-methyl-3-pyridone and 3-hydroxypyridine13C NMR Spectroscopy, Part IV. For Part III, see Ref. 43. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 551-559 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbon and proton NMR spectra of 3-hydroxypyridine and its O-methyl and N-methyl derivatives have been analysed, and are compared with the spectra of the corresponding 2- and 4-substituted pyridines. It is shown, that contrary to quantum chemical predictions and in agreement with chemical experience, 3-hydroxy-pyridine has a phenolic structure in solution. For the N-methyl derivative, however, carbon and proton NMR data clearly demonstrate that this compound should be formulated as N-methyl-3-pyridone. The general problem of the 3-pyridones is discussed on the basis of calculated π-electron densities, IR and NMR data.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270051202
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    New products (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. A13 
    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.1270050114
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    Dioxidobutane: A comparison between high field and Eu-shifted PMR spectra (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 53-56 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complete analysis of the high field spectrum of the title compound gives well determined parameters in all cases; the value of the CH—CH coupling is in agreement with free rotation around this bond. In contrast, the Eu-shifted spectrum does not allow such a complete analysis because of lack of resolution. Shift dependence on concentration and temperature is reported and discussed.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050112
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  • 65
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    Détermination des Axes Propres et des Valeurs Principales du Tenseur ḡ dans deux Radicaux Libres Nitroxydes par Étude de Monocristaux (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 47-52 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The low temperature phase structure of the nitroxide radical 2,2,6,6-tetramethyl piperidin-1-oxyl (Tanane) is isomorphic of 2,2,6,6-tetramethyl-4-piperidinol-1-oxyl (Tanol). An ESR study of single crystals yielded the principal values and position of principal axes of the ḡ tensor in these two radicals. The major significant differences observed in Tanol are a moderate decrease in the gxx, gyy and gzz values, and a deviation of the principal axes situated in the molecular mirror plane from the N—O bond and π-orbital, respectively (8° ± 2°). The intermolecular hydrogen bond is probably responsible for this fact.
    Notes: La structure de la phase basse température du radical nitroxyde tétraméthyl-2,2,6,6 pipéridine oxyle-1 (Tanane) a été déterminée. Ce radical libre est isomorphe du tétraméthyl-2,2,6,6 pipéridinol-4 oxyle-1 (Tanol). Une étude en résonance paramagnétique électronique de monocristaux a permis de déterminer les valeurs principales et l'orientation des axes propres du tenseur ḡ pour ces deux radicaux. Pour le Tanane, la liaison N—O est une direction propre du tenseur ḡ. Pour le Tanol, il existe un angle de 8° ± 2° entre cette direction propre et la liaison N—O. Il est vraisemblable que, dans le cas du Tanol, la liaison hydrogène intermoléculaire est responsable de la déviation observée pour les axes propres situés dans le plan miroir , ainsi que des plus faibles valeurs mesurées pour gxx, gyy et gzz.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050111
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973) 
    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.1270050201
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    Proton and boron-11 magnetic resonance studies of some potassium tetraarylborates (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 57-59 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton and boron-11 magnetic resonance spectra for several potassium para-substituted tetraarylborate compounds [KB(C6H4-pX)4, where X is H, OCH3, CH3, Br, Cl, F, CF3] have been obtained. The chemical shift between the centers of the AA′ and XX′ multiplets for the ring proton multiplets, relative to a reference chemical shift of 0·39 ppm for potassium tetraphenylborate, correlated with the corresponding Hammett σ values for the para-substituent. Additionally, the boron-11 chemical shifts gave a good correlation with corresponding σ values for the substituents. Electronegativities of para-substituted phenyl rings were calculated and found to be approximately 2·70 for all compounds studied. It was shown that electronic substituent effects do not greatly influence the electron density surrounding the central boron atom in the tetraarylborate ions.
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    Etude comparative des méthyl-borazines par RMN (1973)
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    Organic Magnetic Resonance 5 (1973), S. 585-588 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A comparative study of borazine (0) and six methyl borazines (1 to 6) has been conducted by NMR. It becomes evident that the chemical shift of N—CH3 protons hardly varies between mono-, di- and tri-N-methyl borazines, whereas this parameter undergoes a strong change (in all 0·21 ppm, to high field) when one passes from N-trimethyl borazine (HB—NCH3)3 to hexamethyl borazine (CH3B—NCH3)3 through a gradual substitution on the three boron atoms (3, 4, 5 and 6). Moreover, a systematic variation of the parameter δ has been found between compounds 3, 4 and 5 for the protons which keep precisely the same immediate environment. A qualitative interpretation of this experimental result is proposed in terms of electronic effects general to the hexagonal planar boron/nitrogen ring which characterises these molecules.
    Notes: Une étude comparée du borazine (0) et de six méthyl-borazines (1 à 6) a été effectuée par RMN. Il apparaǐt nettement que le déplacement chimique des protons N—CH3 varie peu entre les mono-, di- et triméthyl-N borazines alors que ce měme paramètre subit une modification importante (au total 0,21 ppm vers les champs forts) quand on passe du triméthyl-N borazine (HB—NCH3)3 à l'hexaméthylborazine (CH3B—NCH3)3 par substitution progressive sur les trois atomes de bore (cycles 3,4, 5 et 6). En outre, une variation systématique du paramètre δ a pu ětre décelée entre les composés 3, 4 et 5 pour les protons qui conservent strictement le měme environnement immédiat. Une interprétation qualitative de ce résultat expérimental est proposée en termes d'effets électroniques généralisés au cycle hexagonal plan bore-azote qui caractérise ces molécules.
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    URL: http://dx.doi.org/10.1002/mrc.1270051207
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    Configurations and conformations in acyclic, unsaturated hydrocarbons. A 13C NMR study (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 147-153 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR (CMR) spectra of a number of di- and trisubstituted ethylenes have been measured. Very consistent values are found for the differential shieldings of allylic carbons in a number of linear, (Z)- and (E)-disubstituted ethylenes. The discrepancies between the several structural elements are explained tentatively by assuming different rotational preferences in the (Z)-isomers, the (E)-isomers, or both. The results obtained for some branched olefins are qualitatively in agreement with conclusions reached in previous 1H NMR (PMR) investigations, with the possible exception of 2,5-diMe-3-hexene.Differential shieldings in trisubstituted ethylenes are larger than in disubstituted ethylenes, probably as a consequence of steric interaction between geminal substituents.It is confirmed, that API's recent relabelling of the isomers of 3-Me-2-hexene was justified. Furthermore, the (E)-configuration is assigned to the high-boiling isomer of 3,4,4-triMe-2-pentene. On the other hand, the high-boiling isomer of 3-Et-4-Me-2-pentene is shown to be the (Z)-isomer. For the isomeric pair of geraniol and nerol, the (E)-configuration is assigned to the former and the (Z)-configuration to the latter, in agreement with our recent PMR investigations.
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    URL: http://dx.doi.org/10.1002/mrc.1270050309
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    An abnormal spin-spin coupling of vinylic-allylic protons generated by a constraint of configuration (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 155-157 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a system where a rigid or frozen conformation constrains an allylic proton to orient nearly perpendicular to the plane of the olefinic bond, the allylic spin coupling may become comparable to, or greater than, the vicinal spin coupling. This anomalous situation is demonstrated in three series of compounds: the adducts of diazoalkanes to 1,2-diazepines, 4-piperidinocycloalk-2-en-1-one oximes and heterobicyclo[3,2,0]hept-3,6-dienes, where the NMR spectra have been well established by decoupling experiments.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050310
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    Position specificity of 13C—31P coupling constants for methyl substituents in phospholes and 2 - PhospholenesPresented at the 164th National Meeting of the American Chemical Society, New York, 30th August 1972, No. ORGN-109. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 161-162 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C - 31P coupling constant is much larger for a 2-methyl substituent (about 20 Hz) than for a 3-methyl substituent (about 5 Hz) in phospholes and 2-phospholenes, and appears useful for assigning structures in these compounds.
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    Déplacements Chimiques Induits par Complexation à l'Europium en Série Δ1-Pyrazoline (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 217-218 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The complex Eu (FOD)3 is shown to be a convenient shift reagent for Δ1-pyrazolines. The five examples described here were chosen to illustrate the usefulness of this method in the attribution of the stereochemistry of polycyclic Δ1-pyrazolines.
    Notes: Le complexe Eu (FOD)3 constitue un bon réactif de déplacement en spectroscopie de RMN de Δ1-pyrazolines. Les 5 exemples décrits ici ont été choisis en série polycyclique pour mettre en évidence l'utilité de cette technique en vue de l'attribution des stéréochimies.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270050504
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    Spectra 0656-0670 (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 1-16 
    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.1270051802
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    Specific rearrangements of 2,4-dimethyl-1-pentene upon electron-impact (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 17-21 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mass spectrometric investigation at 70 eV and at low voltage of specifically deuterated and undeuterated 2,4-dimethyl-1-pentene is reported, in order to illustrate the specificity of the degradation reactions occurring under electron-impact. A mechanism for the skeletal rearrangement of the molecular ion prior to fragmentation is proposed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070104
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    The electron-impact induced fragmentation of substituted 4-styrylquinolinesReported in part at the 3rd Yugoslavian Conference on Pure and Applied Chemistry, Ljubljana, 12th to 17th June 1972. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1-10 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation of 4-styrylquinoline (I), 4-(p-nitrostyryl)-quinoline (II), 4-(p-chlorostyryl)-quinoline (III), 4-(p-hydroxystyryl)-quinoline (IV), 4-(p-methoxystyryl)-quinoline (V), 4-(p-dimethylaminostyryl)-quinoline (VI) and 4-(p-cyanostyryl)-quinoline (VII) under electron-impact in the mass spectrometer is reported. The role and the influence of substituents on the fragmentation scheme is discussed. The loss of the substituents from the molecular ion is correlated with LCAOMO quantities.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070102
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    Elektronenstossinduzierte Fragmentierung von Acetylenverbindungen - V:IV. Mitteil: H. Schwarz und F. Bohlmann, Org. Mass Spectrom.7, 23 (1973). Vergleich der Isomeren Naphthyl- und Phenyl-Pentinen-Alkohole (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 29-35 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The differences found in the fragmentation pattern of the isomeric naphthyl- and phenyl-pentynen-alcohols have been elucidated by the investigation of 2H- and 13C-labelled derivatives. As shown by high resolution mass spectrometry, in the case of the acetylenic compound, the ion [C9H7]⊕ is formed mainly by ketene elimination from the [M - 1]+-ion and from the naphthalenes by elimination of acetylene from the benztropylium-ion. The proposed mechanism of CO- and CHO-elimination given for benzylalcohol cannot be transferred to the compounds investigated.
    Notes: Die Unterschiede im Fragmentierungsschema der isomeren Naphthyl- und Phenylpentinen-aklohole sind durch Untersuchung der 2H- und 13C-markierten Derivate nachgewiesen worden. Wie durch hochauflösende Massenspektrometrie gezeigt werden kann, wird im Falle der Acetylenverbindung IOn [C9H7]⊕ hauptsächlich durch Keten-eliminierung aus dem [M - 1]+-Ion und bei den Naphthalinen durch Abspaltung von Acetylen aus dem Benztropylium-Ion gebidet. Der vorgeschlagene Mechanismus der CO- und CHO-Abspaltung füBenzylalkohol kann nicht auf die untersuchten Verbindungen übertragen werden.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070106
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    Spectrometrie de Masse de Produits Naturels Aromatiques Polychlores (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 119-121 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass spectra of three natural aromatic compounds are reported: 1,4-dimethoxy-2,3,5,6-tetrachlorobenzene (I), 4-methoxy-2,3,5,6-tetrachlorophenol (II) and 1,4-dimethoxy-2-nitro-3,5,6-trichlorobenzene (III). Main fragmentations are explained according to the formation of a quinoid structure (a), which leads under electron-impact to the formation of a chlorocyclopropenone ion (c). Secondary routes giving [CxCl]+ ions are also proposed. Emphasis is given to the variations introduced into the fragmentation by the presence of a nitro group.
    Notes: On discute les spectres de masse de trois produits naturels aromatiques: le diméthoxy-1,4 tétrachloro-2,3,5,6 benzén (I), le méthoxy-4 tétrachloro-2,3,5,6 phénol (II) et le diméthoxy-1,4 nitro-2 trichloro-3,5,6 benzéne (III). Les principlaes fragmentations sont expliqués en fonction de la formation de la structure quinoide (a), qui conduit sous l'impact électronique à la formation de l'ion chlorocyclopropénone (c). On propose également des voies secondaires conduisant à la formation d'ions [Cx]+. On relevé les variations introduites dans la fragmentation par la présence du groupement nitro.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070118
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    Mass spectrometry of the trimethylsilyl derivatives of some cardiac aglycones and monoglycosides (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 141-153 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of the trimethylsilyl (TMS) ethers of digitoxigenin, digoxigenin, digitoxigenin monodigitoxoside, digoxigenin monodigitoxoside and peruvoside were obtained. Ions appearing at m/e 170 and m/e 183 are proposed to be indicative of the enol TMS ether moiety as confirmed by appropriate shifts in the mass spectrum of digitoxigenin derivatized with perdeuterotrimethylsilylating reagent. The TMS ether derivatives of the monoglycosides produced abundant molecular ions and the base peaks in the spectra represent fragments of the sugar portion of the molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070204
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    Kinetic energy release in ionic fragmentations: Use as an ion structure probe (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 185-192 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetic energy released in unimolecular reactions, as measured from the width of the corresponding metastable peak, shows only a small dependence on such parameters as source temperature, ion-source residence time and ion acceleration voltage. Similarly, fragmenting ions generated from different members of an homologous series of molecular ions have been found to release the same kinetic energy and hence do not exhibit a degrees-of-freedom effect analogous to that for metastable abundances. In general, molecular ions formed by electron-impact have been found to release slightly less kinetic energy on fragmentation than the corresponding ions formed via a fragmentation sequence. These observations suggest that kinetic energy release is a useful method of structural characterization of metastable ions; while increase in the average internal energies of the ions sample lead to larger energy releases, this effect is usually small. The use of a very narrow energy resolving (β) slit and a procedure in which the metastable peak width is extrapolated to zero slit width has been found to improve the accuracy of measurement of the kinetic energy release, particularly when the metastable and main beam peak widths are of comparable magnitude.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070208
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    Heterocyclic studies - XXIX:For Part XXXVIII, see Ref. 1. Mass spectra of some 1,2-dihydro-5-trifluoromethyl-pyrimido(5,4-E)AS-triazines (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 225-231 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of five 7-substituted-1,2-dihydro-5-trifluoromethylpyrimido(5,4-e)as-triazine derivatives are recorded. Fragmentation pathways, elucidation of which was assisted by deuterium labelling and accurate mass measurements, are compared with those of corresponding heteroaromatic compounds. Loss of HF initiated the major breakdown pathways, unless a large 7-substituent was present, which then fragmented preferentially.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070212
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    Elektronenstossinduzierte Fragmentierung von Acetylenverbindungen - VI:V. Mitteilung: H. Schwarz und F. Bohlmann, Org. Mass Spectrom. 7, 29 (1973). Struktur und Bildungsenthalpie der Ionen [C11H9]+ und [C9H7]+ (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 395-399 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The appearance potentials for [C11H9]+ from 1, e.g. 2-(chloromethyl)-naphthaline and 1-chloro-phenyl-(5)-penten-(2)-yne-(4), and for [C9H7]+ from indene, phenyl-propyne and phenyl-(5) penten-(2)-yne-(4)-ol-(1), have been correlated with thermochemical data to obtain the enthalpy of formation of the fragment-ions. A comparison between these enthalpies of formation and the values of enthalpy of hypothetical model structures shows that the [C11H9]+ ion is probably best represented as a benztropylium-ion and the [C9H7]+ ion as an ethynyl-tropylium-ion or as a phenylcyclopropenyl-cation. Open chain structures can be eliminated in all cases investigated.
    Notes: Die Erscheinungspotentiale für [C11H9]+ aus 1-bzw, 2-(Chlormethyl)-Naphthalin und 1-Chlor-phenyl-(5)-penten-(2)-in-(4) und für [C9H7]+ aus Inden, Phenylpropin und Phenyl-(5)-penten-(2)-in-(4)ol-(1) werden mit thermochemischen Daten korreliert, um die Bildungsenthalpien der genannten Fragment-Ionen zu erhalten. Ein Vergleich dieser Bildungsenthalpien mit den Enthapiewerten hypothetischer Modellstrukturen ergibt, dass das IOn [C11H9]+ wahrscheinlich am besten als Benztropylium-Ion und das Ion [C11H9]+ enweder als ein Äthinyl-Tropylium-Ion oder als ein Phenylcyclopropenyl-Kation wiedergegeben wird. Offenkettige Strukturen Können in allen untersuchten Fällen ausgeeschlossen werden.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070404
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    The effect of 2,3-substituents upon the mass spectrometric fragmentation of quinoxalines (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 449-457 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric fragmentation of quinoxalines substituted with alkyl and aryl groups in the C-2 and C-3 positions and with groups containing heteroatoms have been studied. Fragmentation mechanisms for the compounds under investigation are proposed and discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070409
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    Massenspektrometrische Fragmentierungen β-Substituierter Adamantanone und Adamantandione (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 485-495 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: High resolution mass measurements and defocused metastable ion detection have been employed in an investigation of the electron-impact-induced fragmentation of a series of β-substituted adamantanones and adamantanediones. Whereas the isomeric bromo-, iodo- and thiocyanato-adamantanones give almost identical spectra, the fragmentation of the fluoro and chloro derivatives is dependent on whether the substituents are ‘axial’ or ‘equatorial’. Hydroxy- and acetoxy-adaman-tanones exhibit rather complex mass spectra. Adamantanediones, substituted in the β-position by various COR- and NR1R2-groups, exhibit characteristic ion peaks which are formed by McLafferty rearrangement and α-cleavage with subsequent elimination of carbon monoxide and allylic bond fission. The mass spectral behaviour of the isomeric hydroxy-carbomethoxy-adamantanones and dihydroxy-adamantanes is determined by the orientation of the functional groups.
    Notes: Durch hoch-und niederauflösende Massenspektrometrie und durch Bestimmung emtastabiler Ionen mittels Defokussierung wurde die elektronenstoß-induzierte Fragmentierung einer Reihe β-substituierter Adamantanone und Adamantandione untersucht. Während die isomeren Brom-, Jod- und Thiocyanato-adamantanone fast identische Spektren liefern, ist das Fragmentierungsverhalten der Fluor- und Chlor-Verbindungen davon abhängig, ob die Substituenten in Bezug auf den die Carbonyl-Gruppe enthaltenden Ring axial oder äquatorial angeordnet sind. Hydroxyund Acetoxy-adamantanone liefern ziemlich komplexe Massenspektren. Adamantandione, die in β-Stellung durch verschiedene COR-bzw. NR1R2-Gruppen substituiert sind, geben charakteristischen Peaks von Ionen, die durch McLafferty-Umlagerung bzw. α-Spaltung und anschließende Eliminierung von Kohlenmonoxid und Allyl-Spaltung gebildet werden Das Fragmentierungsverhalten der isomeren Hydroxycarbomethoxy-adamantanone und Dihydroxy-carbomethoxyadamantane wird durch die Orientierung der funktionellen Gruppen bestimmt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070413
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    Zum Mechanismus massenspektrometrischer Fragmentierungsreaktionen - IXFür VIII. Mitteilung, siehe Lit.1.Sterische Effekte in den Massenspekten der Stereoisomeren von Decalin-2,3-diolen, Decalin-2,4-Diolen und Ihen Dimethyläthern (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 573-587 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of all stereoisomers of decalin-2,3-diol, the corresponding dimethyl ethers and of some deuterated derivatives are discussed. The mass spectra of isomeric decalin-2,3-diols differ only slightly in ion intensities. The mass spectra of the stereoisomeric 2,3-dimethoxy-decalins are nearly identical within the series of transand cisderivatives. A mass spectrometric identification of the stereoisomers of these compounds is therefore diffucult. Stereoselective eliminations from the molecular ion are not observed.The mass spectra -of stereoisomeric decalin-1,4-diols show characteristic differences in the intensities of the[M — H2O]+·-ions, which can be related to the geometry of the molecules in a similiar mode as was the case with cyclohexane-1,4-diols, The sterechemical control of the elimination of H2O from the molecular ions has been confirmed by deuterium labelling.The mass spectra of stereoismeric 1,4-dimethoxy-decalins also differ characteristically in the intensities of the [M — CH3OH]+· ions. Furthermore peak due to the [M — CH2O]+· ions are only observed in the mass spectra of those stereoisomers, which have at least one conformation with a short distance between the two methoxy. The stereospecifity of the CH3OH- and CH2O-eliminationjs has also been determined by deuterium labelling.
    Notes: Die Massenspektren aller Stereoisomeren des Decalin-2,3-diols und des Decalin-1,4-diols sowie ihrer Dimethyläther und einiger spezifisch deuterierter Dervae dieser Verbindungen werden diskutiert. Bei den Decallin-2,3 diolen weden nur geringe quantitative Unterschiede in den Ionenintensitätten gefunden. Die Massenspektren der stereoisomeren 2,3-Dimethoxy-decaline sind innerhalb der cis- und trans-Reihe nahezu glech, so daß eine massenspektrometrische Identifizierung der Stereoisomeren schwerfällt. Stereoselektive Eliminierungsreaktionen in den Molek¨l-Ionen können nicht nachgewiesen werden.In den Massenspektren der Decalin-1,4-diole treten charakteristische Unterschiede in den Intensitäten der Ionen [M — H2O]+· auf, die in übersichtlicher Weise wie bei de Cyclohexan-1,4-diolen mit der Molekülgeometrie der einzelnen Stereoisomeren in Beziehung gesetzt werden können. Die sterischen Kontrolle der H2O-Abspaltung aus den Molekül-Ionen wird durch Deuterium-Markierungen bewisen. Die Massenspektren der Stereoisomeren der 1,4-Dimethoxydecaline zeigen ebenfalls deutliche Unterschiede in den Intensitäten der [M — CH3OH]+·-Ionen. Weiterhin treten Peaks von [M — CH2O]+·-Ionen nur in den Massenspektren derjenigen Isomeren auf, bei denen in irgendeiner der Moleküklonformationen ein kurzer Abstand zwischen den Methoxygruppen errricht werden kann. Die Stereoseletivität der CH3OH- und CH2O-Eliminierungen wird gleichfalls druch Deuterium-Markierungen bewiesen.
    Additional Material: 13 Ill.
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    Preferred electron-impact elimination of two CHO groups from A triapentafulvalenequinone. Formation of a triafulvalene radical cation?The present work is Part 75 of ‘Fulvenes and Thermochromic Ethylenes’. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 907-909 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentations of 1,2-diphenyl- and 1,2-di (phenyl-d5)-4,5-benzotriapentafulvalene-3,6-quinone indicate the preferred elimination of two CHO groups with the formation of triafulvalene radical cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070717
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    Ionisation and appearance potentials in the evaluation of nonbonded interactions - IV: Conformational effects in methyl-substituted 1,3-oxathianes (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 949-954 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ionization and appearance potentials for the molecular and [M — Me]+ ions of several stereoisomeric methyl-1,3-oxathianes were measured. The differences between the ionisation and/or appearance potentials are shown to correlate well with the conformational energy differences in question.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070804
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    The fragmentation of ortho-methoxyphenyl-2-propanone oximes and related compounds-further examples of an ortho-effect (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 985-988 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An [M — 31]+ ion was a prominent fragment in the mass spectra of three ortho-methoxy-phenyl-2-propanone oximes and is shown to be due to the expulsion of a methoxyl radical from the molecular ion as a result of an ortho-effect. In contrast, an [M — 31]+ ion was absent from the spectra of a structurally related ketone and a hydroxylamine, and was not observed in the spectra of meta- and para-methoxyphenyl-2-propanone oximes.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070808
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    Permethylation of barbiturates. Separation and characterization of the reaction products by gas chromatography-mass spectrometry (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 989-1000 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Series of barbiturates (I) has been permethylated with the methylsulfinylmethide carbanion and methyl iodide and the products (II to IV) separated, quantified and characterized by g.c.-m.s. The ratios and fragmentation patterns of II to IV are highly dependent upon the nature of the R-groups. All fragment ions have been confirmed by accurate mass measurements or perdeuteriomethylation.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070809
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    Mass spectra of trimethylsilyl ethers of some Δ5-3β-hydroxy C 19 steroids (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 925-948 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra (20 eV electron energy) of a wide range of %Δ5-3β-hydroxy C19 steroid TMS ethers have been examined with the aid of high-resolution mass measurements, together with deuterium and oxygen-18 labelling data. The validity of many previously proposed fragmentation modes has been confirmed. A number of ions regarded as diagnostic have been shown to be less specific than had been formerly supposed. Several novel fragmentations have been observed and investigated.
    Additional Material: 13 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070803
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    An experimental and indo molecular orbital study of variable response of the p-phenyl substituent to electron demand. Relative conformations of two p-arylacetophenones as neutral molecules and +1 molecular ions (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1179-1187 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The INDO molecular orbital method suggests that the rings of p-phenylacetophenone and 2-fluoro-4′-acetylbiphenyl are more nearly coplanar in the +1 molecular ion than in the neutral molecule. This is indicated by old experimental data for the former and new data for the latter, based on the cleavage to [CH3CO]+.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210071007
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    Electronic Resource
    Echtzeit-Datenerfassungssystem mit minimaler hardware für den Einsatz in der Routine-Massenspektrometrie im organischen Laboratorium (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1215-1225 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A low-cost on-line digital computer system for data acquisition and reduction of mass spectral information from a single focusing mass spectrometer is described. The data system is designed to handle the problems most commonly encountered in routine applications in organic chemistry. By using sophisticated programming concepts a versatile user oriented system is realised on a minimal hardware configuration. Detailed information about data flow and logical structure of the programs is given.
    Notes: Zusammenfassung-Ein Echtzeit-Datenerfassungssystem für den Einsatz bei der Routineanwendung der niedring auflösenden Massenspektrometrie im organischen Laboratiorium wird beschrieben. Das Datensystem ist für die Lösung jener Probleme optimiert, die in der Routine am häufigsten auftreten. Die Verwendung aufwendiger Programme erlaubt die Realisierung eines vielseitigen, benützerfreundichen Systems mit minimaler Hardware-Konfiguration. Datenfluss und logische Struktur der Programme werden eingehend beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071102
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  • 92
    Electronic Resource
    Electronic Resource
    The mass spectra of some N-substituted barbitals and their trimethylsilyl derivatives (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1227-1234 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of N-propyl and N-butyl barbitals show the loss of olefin radical (CnH2n-1) in analogy to structurally similar molecules such as N-alkyl succinimides and 3-alkyl uracils. Trimethylsilylation of the N-substituted barbitals suppresses this fragmentation and loss of olefin via apparent McLafferty rearrangement from the even-electron ion, [M - 15]+, becomes significant. The trimethylsilyl derivatives of N-allyl barbital and N-phenyl barbital show an unusually facile elimination of the appropriate isocyanate from the molecular ion.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071103
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  • 93
    Electronic Resource
    Electronic Resource
    Silylgruppenwanderung und CO2-Eliminierung beim massenspektrometrischen Zerfall von N-Trifluoracetyl-α-aminosäretrimethylsilylestern (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1387-1394 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The molecular ions of N-trifluoroacetyl α-amino acid trimethylsilyl esters exhibit a characteristic elimination of CO2, in contrast to other amino acid derivatives and apparently caused by migration of the ester trimethylsilyl group to the oxygen atom of the N-trifluoroacetyl function. Fragmentation of the [M - CO2]+· ions gives rise to a series of intense peaks, especially for the aliphatic amino acid derivatives. In the case of the isomers leucine and isoleucine, different base peaks are formed for the 20 eV spectra. Amino acids which can easily split off a group in their β-position possibly fragment by synchronous elimination of CO2 and this group. With serine, threonine and cysteine a concurrent ester silyl migration to the oxygen of the β-function is observed, accompanied by the expulsion of CO2.
    Notes: Die Molekü-Ionen der N-Trifluoracetyl-α-amminosäuretrimethylsilyester zeigen im Gegensatz zu anderen Aminosäurederivaten eine charakteristische Abspaltung von CO2, offensichtlich als Folge einer Wanderung der Ester-trimethylsilylgruppe zum Sauerstoff der N-Trifluoracetylfunktion. Durch die weitere Fragmentierung der so gebildeten [M-CO2]+·-Ionen entstehen besonders bei Derivaten der aliphatischen Aminosäuren intensive Bruchstü ke. Bei den Isomeren leucin und Isoleucin führt sie sogar zu unterschiedlichen basispeaks für die 20 eV-Spektren. Aminosäuren mit leicht abspaltbarer gruppe in β-Position scheinen Co2 synochron mit dieser Gruppe zu eliminieren, so daß bei ihnen das [M-CO2]+·-Ion selbst nicht zu beobachten ist. Als Konkurrenzreaktion zur Wanserung der estersilylgruppe zum N-Triffuoracetyl-sauerstoff tritt bei Serin, Threonin und Cystein eine Si-Umlagerung zur β-ständigen funktionellen Gruppe auf. Auch sie verläuft unter gleichzeitiger Abspaltung von CO2.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071212
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  • 94
    Electronic Resource
    Electronic Resource
    Deuterium isotope effects in mass spectrometry. Mechanism of formation of the [C6H6S]+· ion in the decomposition of s-phenyl methylthiocarbamate (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1415-1417 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the [C6H6S]+· fragment ion formed from S-phenyl methylthiocarbamate and undergoing subsequent metastable loss of CS, the hydrogen is not bound to the sulphur atom, as indicated by deuterium isotope effects on competing metastable transitions.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071216
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  • 95
    Electronic Resource
    Electronic Resource
    Mass spectral studies on 7-azabicyclo (2.2.1) heptane systemsNCL Communication No. 1703. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1419-1422 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An attempt has been made to rationalise the major fragmentation modes of a few C2, C3 disubstituted 7-p-toluene sulphonyl and 7-carbobenzyloxy-7-azabicyclo (2.2.1) heptanes.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071217
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  • 96
    Electronic Resource
    Electronic Resource
    Mass spectrometric fragmentations of hexafluoroacetone ketals derived from N-alkenesPresented in part at the American Society for Mass Spectrometry, 19th Annual Conference on Mass Spectrometry and Allied Topics, Atlanta Ga, 2nd to 7th May 1971. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 259-270 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric fragmentation behavior of the cyclic hexafluoroacetone ketals derived from eighteen n-alkenes is discussed with emphasis on locating the original olefinic bond. The major analytically useful fragments result from loss of CF3, loss of an alkyl side chain or loss of an aldehyde moiety from the ring. Influences of geometric isomerism on the spectra are examined by intensity ratios and ratios of competing fragmentations.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070303
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  • 97
    Electronic Resource
    Electronic Resource
    The effect of stereochemistry on the mass spectra of the bis(trimethyl-silyl) esters of maleic and fumaric acids (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 291-293 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of the bis(trimethylsilyl) esters of maleic and fumaric acids provide a simple and particularly striking example of the influence of stereochemistry on the electron-impact-induced fragmentation of organic molecules. The results provide evidence for the structural significance of the m/e 147 ion, which is considerably more intense in the maleate spectrum than in the fumurate spectrum.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070307
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  • 98
    Electronic Resource
    Electronic Resource
    Mass spectrometry of heterocyclic compounds - III.For Part II, see Ref. 1. Electron-impact-induced fragmentation of 1,2-benzisothiazole and some 3-substituted derivatives (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 327-334 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of fifteen 1,2-benzisothiazoles are reported; their fragmentation patterns have been investigated by labelling experiments, high resolution mass measurements and defocused metastable ion detection. The parent compound of the series, 1,2-benzisothiazole, eliminates HCN after partial inter-ring hydrogen scrambling. The extent of scrambling has been determined for normal daughter ions produced at different electron beam energies and also for metastable daughter ions, and is compared with the data reported for benzothiazole. Some 3-substituted derivatives show unusual fragmentation patterns. The mechanisms of these processes are under further investigation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070311
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  • 99
    Electronic Resource
    Electronic Resource
    Advances in linear free energy relationships edited by N. B. Chapman and J. Shorter, Plenum Press, London, 1972. pp. XIV + 486. £10.00, $28.00 (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 365-365 
    Details
    ISSN: 0030-493X
    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/oms.1210070316
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  • 100
    Electronic Resource
    Electronic Resource
    Masthead (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973) 
    Details
    ISSN: 0030-493X
    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/oms.1210070401
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