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  • 1
    Electronic Resource
    Electronic Resource
    Irigermanal and iridogermanal: two new triterpenoids from rhizomes of Iris germanica L (1982)
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 2531-2536 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00134a007
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  • 2
    Electronic Resource
    Electronic Resource
    Cement fixation and screw retention: parameters of passive fit (2004)
    Oxford, UK : Munksgaard International Publishers
    Clinical oral implants research 15 (2004), S. 0 
    Details
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: It is generally assumed that passively fitting superstructures are a prerequisite for long-lasting implant success. In the study presented, the strain development of three-unit implant fixed partial dentures (FPDs) was evaluated at the bone surrounding the implant and on the superstructure using a strain gauge technique. Six groups of three-unit FPDs representing the commonly used techniques of bridge fabrication were investigated with 10 samples each, in order to quantify the influence of impression technique, mode of fabrication and retention mechanism on superstructure fit. Two ITI implants (Straumann, Waldenburg, Switzerland) were anchored in a measurement model according to a real-life patient situation and strain gauges were fixed mesially and distally adjacent to the implants and on the bridge pontics. The developing strains were recorded during cement setting and screw fixation. For statistical analysis, multivariate two sample tests were performed setting the level of significance at P=0.1. None of the investigated bridges revealed a truly passive fit without strains occurring. About 50% of the measured strains were found to be due to impression taking and model fabrication, whereas the remaining 50% were related to laboratory inaccuracies. The two impression techniques used did not reveal any significant differences in terms of precision. Both modes of fixation – i.e. cement and screw retention – provoked equally high stress levels. In the fabrication of screw-retained FPDs, similar results were obtained from the use of burn-out plastic copings and the technique of casting wax moulds to premachined components. Bonding bridge frames onto gold cylinders directly on the implants significantly reduces strain development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0501.2004.01027.x
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  • 3
    Electronic Resource
    Electronic Resource
    Overdenture attachment selection and the loading of implant and denture-bearing area. Part 1: In vivo verification of stereolithographic model (2001)
    Copenhagen : Munksgaard International Publishers
    Clinical oral implants research 12 (2001), S. 0 
    Details
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Preliminary to a study investigating the force transfer from osseointegrated dental implants to the surrounding bone via various types of overdenture attachment, a stereolithographic model (SL-model) was constructed and compared to an in vivo situation in order to confirm the validity of the modeling technique for the planned measurements of implant strain and denture-bearing area loading. The SL-model was generated using the patient’s computer tomographic data and duplicated in a material of known elastic properties. The model was fitted with sensors to measure strains in the peri-implant bone and loading forces within the posterior mandibular bone, i.e. the denture-bearing area of the mandible. Special telescopic copings were constructed to measure implant strain in this model as well as in vivo. Using these copings under identical overdenture loading conditions, the strains measured at the implants in vivo and in vitro were the same and never exceeded a tolerance of two standard deviations or a mean difference of −8.5% of the in vitro value. This indicates that the model was reliable for the measurement of implant strain. Denture-bearing area loading within the alveolar ridge cannot be measured in vivo. Instead, a method of extrapolating in vivo denture-bearing area loading figures from implant strain readings was developed and tested (better than 90% accuracy). These in vivo extrapolated figures were then compared to in vitro readings under otherwise identical loading conditions. The result indicated that the SL-model is reliable for measurements of denture-bearing area loading with an error of 10 to 20%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0501.2001.120610.x
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  • 4
    Electronic Resource
    Electronic Resource
    Overdenture attachment selection and the loading of implant and denture-bearing area. Part 2: A methodical study using five types of attachment (2001)
    Copenhagen : Munksgaard International Publishers
    Clinical oral implants research 12 (2001), S. 0 
    Details
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: In general, an implant is loaded via axial and horizontal forces. Besides this, moment loading can also occur. The aim of this study was to investigate how different prosthetic connectors with overdentures develop force transfer to implant and bone as well as to the denture-bearing alveolar ridge. Five connectors were investigated on a stereolithographic model fabricated according to a real patient situation. The model was fitted with strain gauges on the “bone” distal and medial to the implants and with vertical force transducers in the alveolar “bone” under the denture-bearing area. The parallel-sided rigid telescopic connector developed the highest moment loading of the implant (P〈0.001), which would suggest restraint in the use of this connector. The bar construction also showed somewhat high moments but these may have been at least partly exaggerated by the individual patient situation. Loading results through the non-rigid telescopic copings, single spherical attachments and magnet overdentures demonstrated a low level of implant moment loading which would in part result from horizontal forces caused by denture forward shift during force application. The denture-bearing area loading was different with all attachments (P〈0.001) and was related to the rigidity of the connector and reached the highest values with the non-rigid telescopic coping. The clinical implications of the various findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0501.2001.120613.x
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  • 5
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    "Lost Languages", by P. E. Cleator" (Book Review) (1964)
    Berkeley : Periodicals Archive Online (PAO)
    Romance Philology. 18:1 (1964:Aug.) 124-125 
    Details
    ISSN: 0035-8002
    Topics: Romance Studies
    Notes: Briefer Mention
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3227-1964-018-01-000018
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  • 6
    Electronic Resource
    Electronic Resource
    Diin-Reaktion, XIV. Mono- und bis-heterokondensierte Benzochinone: Benz-, Furo-, Thieno-, Selenopheno-isoindolchinone (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2523-2528 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diyne Reaction, XIV. Mono- and Bis-heterofused Benzoquinones: Benz-, Furo-, Thieno-, Selenopheno-isoindole-quinonesThe synthesis of a new diyne 2.5-dimethyl-1-phenyl-3.4-bis(phenylpropioloyl)pyrrol (4) and its application in the diyne reaction is described. The diyne 4 gives in quantitative yield a rhodium complex (5) on treatment with tris(triphenylphosphine)rhodium chlorid. The complex 5 reacts with tolan to give a heterofused benzoquinone derivative (6) and with chalkogenes to give the bis-heterofused quinone systems furo- (9), thieno- (7), and selenophenoisoindolequinones (8).
    Notes: 2.5-Dimethyl-1-phenyl-3.4-bis-phenylpropioloyl-pyrrol (4), dessen Synthese beschrieben wird, bildet quantitativ einen Rhodiumkomplex 5 mit Tris(triphenylphosphin)-rhodiumchlorid. 5 ergibt bei Umsetzung mit Tolan ein mono-heterokondensiertes Benzochinonderivat (6), mit Chalkogenen die entsprechenden bis-heterokondensierten Furo-(9), Thieno-(7) und Selenopheno-isoindolchinone (8).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050812
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Struktur der isomeren 1-Methyl-3,4- bzw. -4,5- pyrazoldicarbaldehyde (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2127-2132 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Concerning the Structure of the Isomeric 1-Methyl-3,4- and -4,5-pyrazoledicarbaldehydesThe methylation of 3,4- or 4,5-pyrazoledicarbaldehyde leads to the formation of the isomeric 1-methyl-3,4- and -4,5-pyrazoledicarbaldehydes 2a or 2b. The structure of these isomers is proved by oxidation to the known o-dicarboxylic acids 6a or 6b. The physical data of the dicarboxylic acids 6a and 6b are compared to the data in the literature.
    Notes: Durch Methylierung von 3,4- bzw. 4,5-Pyrazoldicarbaldehyd werden die isomeren 1-Methyl-3,4- bzw. -4,5-pyrazoldicarbaldehyde 2a bzw. 2b erhalten. Deren Struktur wird bewiesen durch Oxidation zu den aus der Literatur bekannten o-Dicarbonsäuren 6a bzw. 6b. Die physikalischen Daten von 6a und 6b werden im Vergleich zu den Literatur-Daten diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070701
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  • 8
    Electronic Resource
    Electronic Resource
    Kondensation von Tellurophendicarbaldehyd mit CH-aciden Verbindungen und Diaminen Synthese neuer Tellurophen-Heterocyclen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3886-3890 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensation of Tellurophenedicarbaldehyde with CH-Acidic Compounds and Diamines Synthesis of New Tellurophene Heterocycles2,5-Diphenyl-3,4-telluorophenedicarbaldehyde (1) is condensed with hydrazine to give the telluropheno-pyridazine 2 which decomposes under the influence of light and oxygen to 4,5-dibenzoyl-pyridazine (3). The reaction with o-phenylenediamine leads to the derivative 4. Cyclisation of 1 with acetonedicarboxylic acid ester and 1,3-diphenylacetone affords the 6H-cyclohepta[c]tellurophen-6-ones 5 and 6. Photooxidation of 6 leads to the tropone 7. 1 reacts with thiodiacetic acid ester to form a stable telluropheno-thiepine 8.
    Notes: 2,5-Diphenyl-3,4-tellurophendicarbaldehyd (1) wird mit Hydrazin zum Telluropheno-pyridazin 2 kondensiert. 2 zersetzt sich unter Einwirkung von Licht und Sauerstoff zu 4,5-Dibenzoylpyridazin (3). Die Umsetzung von 1 mit o-Phenylendiamin liefert das Derivat 4. Durch Cyclisierung von 1 mit Acetondicarbonsäureester und 1,3-Diphenylaceton erhält man die 6H-Cyclohepta[c]tellurophen-6-one 5 und 6. Die Photooxidation von 6 liefert das Troponderivat 7. Kondensation mit Thiodiessigsäureester führt zu einem beständigen Telluropheno-thiepin 8.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761091217
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  • 9
    Electronic Resource
    Electronic Resource
    Photochemie des 1,3,5-Tristyrylbenzols (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2452-2463 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of 1,3,5-TristyrylbenzeneDepending on the reaction conditions the irradiation of the title compound 1 yields the cyclophane 5, the pyrene derivative 6, or the polycondensed aromatic system 9. An X-ray analysis was performed for 5, representing a new type of cyclophane in which two benzene rings are bridged again by rings.
    Notes: In Abhängigkeit von den Reaktionsbedingungen erhält man bei der Belichtung der Titelverbindung 1 das Cyclophan 5, das Pyrenderivat 6 oder das polykondensierte aromatische System 9. Für den neuen Cyclophantyp 5, bei dem zwei Benzolringe selbst wieder durch Ringe verbrückt sind, wurde eine Röntgenstrukturanalyse durchgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170716
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  • 10
    Electronic Resource
    Electronic Resource
    Diin-Reaktion, XXXIV. Mono- und bis-heterokondensierte Dibenzothiophenchinone: Benzo-, Furo-, Thiopheno-, Selenopheno-, Telluropheno-, Pyrrolo-dibenzothiophenchinone (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 237-242 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diyne Reaction, XXXIV. Mono- and Bis-heterocondenesed Benzoquinones: Benzo-, Furo-, Thiopheno-, Selenopheno-, Telluropheno-, Pyrrolo-dibenzothiophenchinones1-Benzothiophene-2,3-dicarbaldehyde (1) reacts with 2 moles of ethynylmagnesium bromide to give a diol 2, the oxidation of which leads to the o-diketodiynes 3a, b. With tris(triphenyl-phosphine)rhodium(I) chloride, 3a, b yield the rhodium complexes 4a and b. These reacts with acetylenes to form the mono-heterocondensed benzoquinones 5-8. 4a, b react with chalcogenides and for the first time with tellurium as well as with nitroso-benzene to give the bis-heterocondensed benzoquinones 9-15.
    Notes: 1-Benzothiophen-2,3-dicarbaldehyd (1) gibt mit 2 mol Äthinylmagnesiumbromid ein Diol 2, dessen Oxidation zu o-Diketodiinen 3a, b führt. Mit Tris(triphenylphosphin)rhodium(I)-chlorid entstehen aus 3a, b die Rhodiumkomplexe 4a, b. Deren Umsetzung mit Acetylenen führt zu Mono-heterokondensierten Benzochinonen 5-8. Mit Chalkogenen, erstmalig auch mit Tellur, sowie Nitrosobenzol entstehen Bis-heterokondensierte Benzochinone 9-15.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080130
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