ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Zur Korrosion verzinkter Eisenwerkstoffe durch natürliche Brauchwässer (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 282-286 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion of galvanized ferrous materials by natural watersLaboratory and field test with galvanized irons do not reveal clear interrelations between water quality and corrosion. Likewise it is not possible on the basis of potential measurements to make any statement with respect to the formation of protective layers. It is for this reason that some doubt may be expressed as to the applicability of the test method according to DIN 50 930, the more so as the formation of ZnCO3 could be shown to take place in some few cases only.
    Notes: Laboratoriums- und Feldversuche mit verzinktem Eisen zeigen keine eindeutigen Zusammenhänge zwischen Wasserbeschaffenheit und Korrosion. Ebenso ist es nicht möglich, aufgrund von Potentialmessungen Aussagen über die Schutzschichtbildung zu machen. Aus diesem Grunde kann auch die Anwendbarkeit der Untersuchungsmethode nach DIN 50 930 in Zweifel gezogen werden, zumal nur in Einzelfällen die Bildung von ZrCO3 eindeutig nachgewiesen werden konnte.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240405
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Characterization of succinimide-type dehydration products of recombinant hirudin variant 1 by electrospray tandem mass spectrometryPresented at the 11th Informal Meeting on Mass Spectrometry, Budapest, 1993. (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1082-1085 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Two congeners Q4 and Q5 inferred in earlier analyses to be cyclic succinimide-type dehydration product; of recombinant hirudin (variant 1) were structurally fully characterized. After isotopic labeling by ring-opening with H218O, the suspected anhydro-positions Asp53 and Asp33 were confirmed by tandem mass spectrometry (MS/MS) sequencing of relevant smaller peplides directly in the enzymatic hydrolysates (V8 protease) using electrospray MS/MS. The chosen strategy proved highly efficient and sensitive.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A conductometric detector for capillary separations (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 722-725 
    Details
    ISSN: 1040-0397
    Keywords: Conductometry ; Detection ; Capillary electrophoresis ; Capillary HPLC ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple electrochemical cell has been constructed for conductometric detection in capillary electrophoresis or HPLC. A platinum ring electrode is chemically deposited at the capillary end and the other electrode, a platinum wire, is immersed, together with the capillary, in a vessel containing the running buffer or the mobile phase used. The cell has been tested on a model system and its operational parameters have been discussed. The measurement is very sensitive (a limit of determination of ca. 3 × 10-9 M for potassium ions) and the detector response is rapid, comparable with that of the UV photometric detector. The dynamic range is wide (at least five concentration decades) but is nonlinear at high concentrations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080804
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Experimentelle Untersuchungen zur Modellierung und Analyse der Heteroazeotrop-Rektifikation (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1287-1287 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306909110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Electron impact mass spectra of substituted 2-OTMS-acetophenones (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1985), S. 432-433 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210200609
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Hydrogen transfer reactions in the formation of “Y + 2” sequence ions from protonated peptides (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1988), S. 217-222 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210230312
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Behaviour of isomeric methyl ethyl and ethyl methyl halosuccinates under electron impact. Elimination of a halogen atom by a multi-step mechanism (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 26 (1991), S. 793-798 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron impact mass spectra of isomeric methyl ethyl and ethyl methyl halosuccinates (X = Cl and Br) are surprisingly different. Only the isomers with the ethyl group remote from the halogen give rise to [M - X]+ ions. A low-energy collision-induced dissociation study of deuterium-labelled analogues of the former isomers indicates that the [M - X]+ ions are mixtures of protonated methyl ethyl maleate (major component, 〉 85%) and fumarate, and the loss of the halogen atom is a multi-step process including at least two specific hydrogen transfers. Migration of a β-hydrogen atom to the carbonyl oxygen within the ethoxycarbouyl group produces a primary radical site in a distonic intermediate which, by subsequent abstraction of a hydrogen atom from C(3), triggers the ejection of X from C(2) with concomitant double bond formation. Whereas in the other isomer an [M - X]+ ion is absent or negligible, a characteristic double loss of C2H4 and CO2 is observed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210260917
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Tandem mass spectrometry in the structural analysis of an oviposition-deterring pheromonePresented at the 10th Informal Meeting on Mass Spectrometry, Padova, 6-8 April 1992. (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 1276-1283 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potential of tandem mass Spectrometry (MS/MS) as a stand-alone technique in the structural analyses of an oviposition-deterring pheromone (ODP, 1) is reviewed. Two facets of the salt-like glycolipid structure of 1 were of major interest in this context: the substitution pattern of the lipid backbone (15-glucosyioxy-8-hydroxypalmitate) and, more specifically, the configurational identity of the sugar portion (glucopyra nose). Throughout this study, trideuterioacetyl derivatives of ODP (1 → pentakis(trideuterioacetyl)-ODP la) and the reference substrates were used. Probing of the sugar moiety by fast atom bombardment (FAB) and both low- and high-energy collision-induced dissociation (CID) of B2-type sugar ions surprisingly failed as a single exception within a larger number of glycosidic substrates subjected to this approach. However, electrospray ionization (ESI) of la with the formation of the sugar ions in the gas phase by ‘first-stage’ CID before mass selection circumvented this difficulty and provided an unambiguous and sensitive probe for sugar stereochemistry. When studying the ODP molecule as a whole, FAB-generated M-like ions such as [M - H]-, [M + Na]+ and [M - H + 2Na]+ were subjected to high-energy CID using a four-sector tandem mass spectrometer. Analyses of simple model substrates such as the 12-trideuterioacetoxystearate anion facilitated the interpretation of the distinct charge-remote fragmentation (CRF) behaviour of la. Whereas all M-like species provided complete records of the lipid portion of la and its oxygenation pattern, only the sodiated cations allowed reliable location of the individual substituents. In these latter species complementary series of ‘sequence ions’ were observed that incorporated either the taurine or the sugar terminus and thus reflected CRF for both alternatives of terminal charge fixation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210271121
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Mechanism of electron impact ionization-induced halogen elimination from 2-methyl-2-bromosuccinatesDedicated to Professor H. Budzikieiwcz on the occasion of his 60th birthday. (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 230-234 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron impact-induced halogen elimination from 2-methyl-2-bromosuccinates occurs only in the one of the two isomeric methyl ethyl esters in which the ethoxycarbonyl group is remote from the halogen, in analogy with the corresponding previously reported halosuccinates. However, the occurrence of debromination in dimethyl 2-methyl-2-bromosuccinate contrasts with the behaviour of dimethyl bromosuccinate, indicating different mechanisms for this process in the two systems. Collision-induced dissociation (CID) and deuterium labelling studies led to the conclusion that a hydrogen transfer from the 2-methyl group to a carbonyl precedes the elimination of Br· from dimethyl 2-methyl-2-bromosuccinate, resulting in a protonated dimethyl itaconate structure for the [M - Br]+ ion. An analogous process is the major route leading to [M - Br]+ ion from 1-methyl-4-ethyl 2-methyl-2-bromosuccinate. In this case deuterium labelling and CID measurements indicated a significant contribution of methyl ethyl citraconate and possibly mesaconate owing to partial operation of a mechanism similar to that reported for 1-methyl-4-ethyl 2-bromosuccinate.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280315
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Tandem mass spectrometric analysis of fixed-charge derivatized oligosaccharidesPresented at the 12th IMSC, Amsterdam, August 1991. (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 29 (1994), S. 713-719 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various derivatives of a set of three isomeric (linear and branched) pentasaccharides (LNF-1, LNF-2 and LNF-3) were prepared and investigated by high-performance tandem mass spectrometry in order to compare their collision-induced dissociation (CID) behaviour. The fast atom bombardment tandem mass spectra of [M + H]+ ions of peracetylated derivatives mainly display fragments containing the non-reducing terminus (B-type ions) and allow a straightforward assignment of sugar sequence and branching together with the identification of some interglycosidic linkages. Permethylated derivatives, which better accommodate the mass range of tandem mass spectrometers in the case of larger oligosaccharides, yield similar results, i.e. predominance of B ions, but the necessary information has to be retrieved from incomplete Bi and Yi ion series. By contrast, CID of permethyl or peracetyl derivatives carrying a preformed charge due to prior reductive amination of the oligosaccharides with trimethyl(p-aminophenyl)ammonium chloride yields exclusively fragment ions comprising the reducing end. In this case, the four distinct series of fragments observed involve charge-remote fragmentation processes. As a consequence, the spectral patterns are not significantly affected by the nature of the sugar O-substituents additionally introduced (i.e. methyl or acetyl).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210291204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...