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  • 11
    Electronic Resource
    Electronic Resource
    Study of the major fragmentation pathways of cypermethrin and related synthetic insecticides using tandem mass spectrometry (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 626-634 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fragmentation pathways of the synthetic pyrethroid cypermethrin and four structurally related insecticides were investigated using a tandem quadrupole mass spectrometer incorporating a hexapole collision cell under positive-ion electron impact ionization conditions. Conventional mass spectrometry using the first quadrupole analyser only and tandem mass spectrometry on selected precursor ions and product ions, and also constant neutral loss scan experiments, were used. Mechanisms and fragmentation pathways are proposed to explain the inherent stability of ions associated with the benzylphenoxy portion of this class of insecticide.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280526
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  • 12
    Electronic Resource
    Electronic Resource
    Fast atom bombardment mass spectra of involatile sulphonated azo dyestuffsThese results were given in part at the British Mass Spectrometry Society Meeting, Cambridge (September 1981). (1982)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 17 (1982), S. 569-574 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fast atom bombardment mass spectra of a range of involatile mono and disazo sulphonated dyestuffs are presented. Excellent spectra are obtained for dyestuffs containing up to five sulphonate groups. The fragmentations are discussed with special reference to the ions formed by cleavage of the azo linkage. The negative ion spectra are shown to be superior to those obtained in the positive ion mode.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210171108
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  • 13
    Electronic Resource
    Electronic Resource
    B. A. Garetz and J. R. Lombardi. Advances in laser spectroscopy, volume 3. J. Wiley & Sons, Ltd. 1986 ISBN 0-471-90990-A £33.50 (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1988), S. 183-183 
    Details
    ISSN: 0887-6134
    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/bms.1200150312
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  • 14
    Electronic Resource
    Electronic Resource
    Mass spectrometric evidence for the formation of silaethene accompanying the fragmentation of a non-ester silicon-containing pyrethroid insecticide (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 617-624 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The non-ester silicon-containing pyrethroid SSI-116 and its carbon analogue (ethofenprox, MTI-500) were investigated using a tandem quadrupole mass spectrometer incorporating a hexapole collision cell under positive-ion electron impact ionization conditions. Conventional mass spectrometry using the first quadrupole analyser only and tandem mass spectrometry on selected precursor ions and product ions, and also constant neutral loss scan experiments, were used. Accurate mass measurements on key ions were made using a high-resolution double-focusing mass spectrometer. Based on the experimental observations, mechanisms have been proposed to explain the major fragmentation pathways of SSI-116 and ethofenprox. The novel expulsion of silaethene, CH2=SiH2, as a neutral species from the silicon-containing insecticide and the formation of an ion at m/z 135, isomeric with the fragment ion, [C9H11O]+, observed in the spectrum of its carbon analogue, have also been rationalized. Minor fragmentation pathways, found only in the silicon-containing analogue, are also discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300413
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  • 15
    Electronic Resource
    Electronic Resource
    Effect of follicle size on bovine oocyte quality and developmental competence following maturation, fertilization, and culture in vitro (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 37 (1994), S. 48-53 
    Details
    ISSN: 1040-452X
    Keywords: Cattle ; IVM ; IVC ; IVF ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The aim of the present series of experiments was to investigate the effect of the size of follicle from which the oocytes originate on their subsequent in vitro developmental ability. Ovarian follicles were isolated and grouped according to size (2-6 mm, 〉6 mm). Primary oocytes were carefully liberated and grouped according to morphology into one of five categories: denuded; expanded; with two or three layers of cumulus; with four or five layers; and with many (six or more) layers. Following in vitro maturation (IVM), fertilization (IVF), and culture (IVC), more oocytes with many layers of cumulus (P 〈 0.01, 70.2%, 73/104 vs. 46.8%, 87/186, respectively) and a higher proportion of blastocysts were obtained from follicles 〉 6 mm compared to 2-6 mm follicles (P 〈 0.01, 65.9%, 60/91 from 〉6 mm follicles vs. 34.3%, 34/99 from 2-6 mm follicles, respectively). Use of follicular fluid (BFF) from follicles of different sizes in the IVM medium did not significantly increase the cleavage rate or blastocyst yield compared to controls. Administration of procine folliclestimulating hormone (pFSH) to donors prior to slaughter was investigated as a possible means of increasing the number of larger sized follicles in the ovaries and, thereby, the quality of the recovered oocytes. It was found that administration of six injections of pFSH beginning 3 days prior to slaughter resulted in a significant increase (P 〈 0.001) in the proportion of follicles 〉6 mm in diameter (31.6%) compared to that in nontreated controls (6.6%) and to animals that received only four injection groups (9.4%). The blastocyst yield from oocytes originating from 〉6 mm follicles, whether from unstimulated or from pFSH-treated animals, was approximately double that of oocytes from 2-6 mm follicles (P 〈 0.01; 42.9%, 24/56 for 〉6 mm follicles vs. 22.8%, 21/92 for 2-6 mm follicles, respectively, for the 6 pFSH group; P 〉 0.05; 62.5%, 5/8 for 〉6 mm follicles vs. 32.8%, 22/67 for 2-6 mm follicles, respectively, for the control). © 1994 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080370107
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  • 16
    Electronic Resource
    Electronic Resource
    Mass spectra of doubly charged ions (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 24 (1989), S. 504-510 
    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 biological molecules, whose molecular mass exceeds 10 kDa, invariably contain multiply charged ions. For example, a survey scan of a small protein will produce singly, doubly and triply protonated molecules, the intensity of the doubly charged species often being greater than that of the singly charged entity. Although the spectra resulting from doubly charged peptides have not previously been studied, collisional activation of such doubly charged species may result in significant additional information pertaining to molecular structure. The techniques employed to study ions originating from multiply charged species were linked scanning of constant B/E and tandem mass spectrometry, namely low collision energy spectra acquired on a BEQQ hybrid instrument. The methodology was applied to model compounds whose tandem mass spectrometry characteristics are well known, e.g. gramicidin S and angiotensin I. The results for the product ions of the [M + 2H]2+ species of the models were obtained which highlight the methodology required for high-mass materials.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210240711
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  • 17
    Electronic Resource
    Electronic Resource
    Normal statistics or not? (1992)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 26 (1992), S. 829-830 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820260611
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  • 18
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    A potent nonpeptide cholecystokinin antagonist selective for peripheral tissues isolated from Aspergillus alliaceus (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-10-11
    Description: A new, competitive, nonpeptide cholecystokinin (CCK) antagonist, asperlicin, was isolated from the fungus Aspergillus alliaceus. The compound has 300 to 400 times the affinity for pancreatic, ileal, and gallbladder CCK receptors than proglumide, a standard agent of this class. Moreover, asperlicin is highly selective for peripheral CCK receptors relative to brain CCK and gastrin receptors. Since asperlicin also exhibits long-lasting CCK antagonist activity in vivo, it should provide a valuable tool for investigating the physiological and pharmacological actions of CCK.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, R S -- Lotti, V J -- Monaghan, R L -- Birnbaum, J -- Stapley, E O -- Goetz, M A -- Albers-Schonberg, G -- Patchett, A A -- Liesch, J M -- Hensens, O D -- New York, N.Y. -- Science. 1985 Oct 11;230(4722):177-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2994227" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aspergillus/*metabolism ; Benzodiazepinones/*isolation & purification/pharmacology ; Chemical Phenomena ; Chemistry ; Cholecystokinin/*antagonists & inhibitors/pharmacology/physiology ; Dose-Response Relationship, Drug ; Gallbladder/drug effects ; Guinea Pigs ; Ileum/drug effects ; Pancreas/drug effects ; Rats ; Receptors, Cell Surface/drug effects ; Receptors, Cholecystokinin
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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