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  • 1
    Electronic Resource
    Electronic Resource
    The schizogony of eimeria maxima in the chicken (1971)
    Springer
    Parasitology research 38 (1971), S. 77-81 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The early part of the life cycle of Eimeria maxima has been reexamined. The occurrence of a schizont in the deep glands 48 h after oocyst inoculation has been confirmed and the schizont illustrated for the first time. Further observations indicate that three generations of schizonts occur before gametogony. At least three generations are necessary to correlate with the reproduction of this parasite judged by oocyst production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00259487
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  • 2
    Electronic Resource
    Electronic Resource
    The detection of occult coccidial infections by inoculating chickens with corticosteroid drugs (1976)
    Springer
    Parasitology research 48 (1976), S. 287-290 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380404
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  • 3
    Electronic Resource
    Electronic Resource
    An unusual local reaction to an intracellular protozoon parasiteEimeria dispersa (1979)
    Springer
    Parasitology research 60 (1979), S. 193-195 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927975
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of 3-quinuclidinyl benzilate impurity in clidinium bromide by thin-layer chromatography and single ion monitoring after gas chromatography mass spectrometry (1979)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1979), S. 271-275 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple gas chromatographic mass spectrometric determination of the impurity 3-quinuclidinyl benzilate in the anticholinergic agent clidinium bromide (3-hydroxy-1-methylquinuclidinium bromide benzilate) is not feasible because clidinium bromide decomposes to 3-quinuclidinyl benzilate in the injection port of the gas chromatograph; the trimethylsilyl derivative of clidinium bromide also decomposes to the trimethylsilyl derivative of 3-quinuclidinyl benzilate. Therefore, a quantitative thin-layer chromatographic gas chromatographic mass spectrometric method has been developed for determining 3-quinuclidinyl benzilate in clidinium bromide, using β-piperidylethyl benzilate as an internal standard. A band containing only 3-quinuclidinyl benzilate and β-piperidylethyl benzilate can be eluted from the thin-layer chromatographic plate. The samples are analyzed by single ion monitoring of m/z 255 produced by the trimethylsilyl derivatives of 3-quinuclidinyl benzilate and β-piperidylethyl benzilate which are separated by gas chromatography. A level of 0.03% of 3-quinuclidinyl benzilate can be determined with a precision of about 6%; the lower limit of detection of 3-quinuclidinyl benzilate alone is about 1 ng on the thin-layer chromatographic plate. Analysis of a reference standard of clidinium bromide by the thin-layer chromatographic gas chromatographic mass spectrometric procedure showed that it contained no detectable 3-quinuclidinyl benzilate. One commercial bulk sample of clidinium bromide contained about 0.018% of 3-quinuclidinyl benzilate, while a formulated sample of clidinium bromide contained no detectable 3-quinuclidinyl benzilate. Commercial samples of clidinium bromide containing chlordiazepoxide can be analyzed for 3-quinuclidinyl benzilate only with difficulty using this method.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200060702
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  • 5
    Electronic Resource
    Electronic Resource
    Pharmacologically interesting compounds - I: High resolution mass spectra of phenothiazines (1969)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 17-31 
    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 twenty-six commercially available medicinal phenothiazines have been determined at high resolution. In each compound, the side chain attached to the 10-position of the phenothiazine ring contains nitrogen and fission of the C—C bond α to this nitrogen gives in most cases the base peak. Some of the compounds are also substituted at the 2-position and this substituent generally remains intact, though some substituents such as acetyl, propionyl, methoxyl and methylthio can undergo fragmentation. Fragmentations fall into three groups; those which give ions representing a part of the side chain; those which give ions representing the intact phenothiazine ring with part of the side chain attached; those which give ions representing a partially fragmented ring system.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210020103
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  • 6
    Electronic Resource
    Electronic Resource
    High resolution mass spectrometry - V:For part IV, see Ref. 1. Cyclic esters of aliphatic α-hydroxy acids (1969)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 893-900 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The main fragmentation sequences of glycollide and its homologues are initiated by fission of a CO—O bond, leading to the formation of fragment ions of low, m/e, such as [R1CO]+ and [CR1R2CCO]+. When a hydrogen atom is present on a ring carbon atom, 1,3 hydrogen migration occurs to produce [CHR2OH]+. In case where a ring carbon atom carries an alkylchain ≥ C2H5, a McLafferty rearrangement occurs with the adjacent carbonyl group. When both ring carbon atoms are dimethyl substituted, a 1,4 hydrogen migration must be invoked to account for the observed fragmentation sequence.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210020904
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  • 7
    Electronic Resource
    Electronic Resource
    The mass spectra of some 2,1,3-benzothiadiazoline and 2,1,3-benzothiadiazine 2,2-dioxides (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 1313-1319 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Although the behaviour of 1H, 2H-2,1,3-benzothiadiazoline 2,2-dioxide is similar to that of sulphoxides in the mass spectrometer in losing a molecule of SO2, the 1,3-dimethyl derivative loses the radical SO2H. In addition the radical CH3SO2 is lost in a one step process that must involve a methyl migration. The radical SO2H is also lost from 2,1,3-benzothiadiazine 2,2-dioxides methylated in the 3-position and the hydrogen involved is shown to originate from this methyl group by deuterium labelling. The mass spectra of other 2,1,3-benzothiadiazine 2,2-dioxides are also discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210061206
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  • 8
    Electronic Resource
    Electronic Resource
    Fragmentation of reduced dibenzo[b,f][1,4]-diazocines, -oxazocines and -thiazocines on electron-impact (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 65-71 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An investigation of the mass spectral behaviour of the title compounds is reported. Two processes have been studied by deuterium labelling. One, which occurs with all three ring systems, results in the loss of a C7H7 radical, whilst the other, which occurs only in the dibenzothiazocine, leads to the loss of a C6H6N radical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070111
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  • 9
    Electronic Resource
    Electronic Resource
    High resolution mass spectrometry. - II Some substituted benzothiazoles (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 285-294 
    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 nineteen substituted benzothiazoles have been recorded and the identity of the various ions in the mass spectra has been established by high resulution (accurate) mass measurement. Deuterium labelling has been used to elucidate the fragmentation processes of these compounds. The parent compound of the series, benzothiazole, exhibits the loss of hydrogen cyanide and carbon monosulphide from the parent ion as the most important decomposition pathways. The hydrogen atom concerned in the loss of hydrogen cyanide is shown to originate from the 2-position of benzothiazole, while in 2-substituted benzothiazoles, different mechanisms are apparent for the loss of hydrogen cyanide, and these are clarified by deuterium labelling. Some substituted benzothiazoles can lose sulphur from their molecular ions, a process which does not occur in benzothiazole itself. The substituted benzothiazoles undergo many other types of fragmentations, in some cases retaining the substituent, and in other cases losing it prior to collapse of the thiazole ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010211
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  • 10
    Electronic Resource
    Electronic Resource
    High resolution mass spectrometry - I. Some substituted δ-lactones (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 279-284 
    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 some δ-lactones substituted in various positions by methyl groups have been studied both by accurate mass measurements at high resulution and by deuterium labelling. The loss of carbon dioxide has been shown to be important only for a mono-substituted lactone. A fragmentation mode common to all the lactones studied is the elimination of the ring oxygen atom, plus the adjacent carbon atom with its substituents, as a neutral carbonyl molecule such as formaldehyde, acetaldehyde or acetone. Deuterium labelling has uncovered the existence of a rearrangement involving hydrogen transfer in an even-electron ion, and a mechanism involving a six-membered transition state is proposed for this. The bond fissions, common to all the lactones, by which the principal ions in the mass spectra arise, are summarised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010210
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