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  • Analytical Chemistry and Spectroscopy  (12)
  • Australia  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Responses of billabong rotifer communities to inundation (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 361-369 
    Details
    ISSN: 1573-5117
    Schlagwort(e): rotifers ; population dynamics ; billabongs ; flooding ; community responses ; Australia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Daily plankton collections were taken from a billabong of the River Murray for two weeks prior to inundation in March 1990, and continued for ten days after flooding. Quantitative responses of the plankton community and the component species were analysed against measured environmental variables and between species. Rotifers and copepod nauplii were the predominant net plankton (〉 53 µm). Significant negative or positive responses to inundation were detected for most common taxa of 63 rotifer species recorded. A four-fold dilution from intrusion of river water masked rapid population increases. Opportunistic responses to inundation appear to be a survival strategy in the highly unpredictable billabong environment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00025861
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  • 2
    Digitale Medien
    Digitale Medien
    Trans-Tasman variation in Australasian Filinia populations (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 455-462 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Rotifera ; Filinia ; Australia ; New Zealand ; taxonomy ; morphology ; trophi SEM
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Morphological comparisons of populations of Filinia from New Zealand and Australia established the presence of an undescribed species in Lake Okaro, N.Z. Filinia novaezealandiae n. sp. is described. SEM micrographs of trophi were used to distinguish closely allied Filinia species. Filinia grandis comb. nov. is redescribed from Australia on the basis of trophi differences from F. pejleri. It is suggested that Filinia species may be more restricted than global records indicate; these records reflect the distribution of authoritative taxonomic references, not necessarily the animals they depict.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00025873
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  • 3
    Digitale Medien
    Digitale Medien
    Collision-induced dissociations of deprotonated peptides. Dipeptides containing methionine or cysteine (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 623-625 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The collisional activation mass spectra of the [M - H]- ions of dipeptides containing Met or Cys show the usual backbone fragmentation allowing the sequence of the peptide to be determined. A methionine residue may be identified by the presence of a pronounced peak resulting from loss of MeSH, while a cysteine residue may be identified by the presence of a peak corresponding to loss of either H2S or (H2S + CO2).
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290070714
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  • 4
    Digitale Medien
    Digitale Medien
    A simple method for differentiating Leu and Ile in peptides. The negative-ion mass spectra of [M — h]- ions of phenylthiohydantoin Leu and Ile (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1241-1243 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Phenylthiohydantoin (PTH) amino acid derivatives are formed during sequential Edman degradation of peptides and proteins. Isomeric Leu and Ile (which differ only in respectively having iso-butyl and sec-butyl chains, and are often difficult to distinguish by conventional mass spectrometric techniques) may be readily identified by the characteristic decompositions of the [M — H]- ions of their PTH derivatives. The Leu spectrum shows major loss of propane, while that of the Ile derivative shows elimination of both methane and ethane. This method may be used routinely with 10 μg quantities of peptide material.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290091305
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  • 5
    Digitale Medien
    Digitale Medien
    A review of the collision-induced dissociations of deprotonated dipeptides and tripeptides. An aid to structure determination (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 169-173 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The structures of underivatized di- and tripeptides may be determined from a consideration of the collision-induced dissociations of their [M - H]- ions. There are three types of fragmentation, viz. (i) the backbone cleavage which provides sequencing information, (ii) α side-chain cleavage irrespective of the position of the amino acid residue, and (iii) cleavages which are characteristic of amino acid residues in specific positions, in particular the N- or C-terminal positions.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290080209
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  • 6
    Digitale Medien
    Digitale Medien
    Characterization of underivatized tetrapeptides by negative-ion fast-atom bombardment mass spectrometry (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 677-685 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The [M — H]- ions derived from tetrapeptides generally show two different collision-induced backbone cleavages which allow the determination of the amino acid sequence of the peptide. The first of these involves the formation of the carboxylate anions of either constituent amino acids or fragment peptides. In the second, amino acids or fragment peptides are eliminated as neutrals. There are a number of residues which undergo characteristic sidechain fragmentations irrespective of their position in the tetrapeptide, e.g. Ser, Thr, Cys, Met, Phe and Tyr. However, there are also some residues which, when situated at the C-terminal end of the peptide, promote pronounced fragmentation at the C-terminal position which occurs to the exclusion of the normal backbone cleavages. We conclude that the data obtained from these negative-ion cleavages are analytically useful, and complement those provided by the cognate positive-ion technique.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290090810
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  • 7
    Digitale Medien
    Digitale Medien
    The oxyisocyanate [ONCO]- and amidoisocyanate [HNNCO]- negative ions (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 151-152 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Ab initio calculations indicate that the ion [ONCO]- is linear, whereas [HNNCO]- is effectively coplanar. The ions may be formed by collisional activation of deprotonated hydroxy and aminocarbamates. The characteristic fragmentations of [ONCO]- and [HNNOO]- are losses of O and NH respectively.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290030509
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  • 8
    Digitale Medien
    Digitale Medien
    Ion chemistry of the methylcarbonate anion (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 338-339 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The ion MeOCO2- fragments upon collisional activation by competitive losses of Me, CH2 and CO2. The loss of formaldehyde involves hydride-ion transfer to form HCO2-. MeOCO2- reacts as a methoxyl-ion donor in a characteristic reaction with sulphur dioxide, i.e. MeOCO2- + SO2→ MeOSO2-+ CO2.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290031004
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  • 9
    Digitale Medien
    Digitale Medien
    The NMR spectra of 1,4-dioxin and 1,4-dithiin partially oriented in a nematic phase (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 433-439 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The PMR spectra of 1,4-dioxin and 1,4-dithiin have been studied in nematic phase liquid crystalline solvents. The ratio of the interproton distances r12 and r13 and the CCH angles have been determined.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270040310
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  • 10
    Digitale Medien
    Digitale Medien
    Mass spectra of some 5- and 6-substituted-2-pyridinecarboxylic acids. Nature of fragmentation step for loss of CO2 (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 555-561 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The fragmentation patterns were obtained by electron-impact on 6-acetamido-, 6-amino-, 6-bromo-, 6-chloro-, 6-methoxy-, 6-methyl-, 6-nitro-, 5-carboxy-, 5-iodo-, 5-methoxy- and 5-nitro-2-pyridinecarboxylic acids, as well as 2- and 3-pyridinecarboxylic acids. Most of these acids lost CO2 [M - 44] as their first major fragmentation. This is in direct contrast to the substituted benzoic acids which show loss of OH [M - 17] or CO2H [M - 45] in their first major fragmentation. Our work suggests that the ring nitrogen may determine which pathway predominates. Figures are presented to illustrate the patterns and metastable ions are indicated when found for the transitions discussed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210040156
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