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  • Electronic Resource  (11)
  • Chemistry  (4)
  • crack velocity  (4)
  • DNA repair  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of vanillin and o-vanillin on induction of DNA-repair networks: modulation of mutagenesis in Escherichia coli
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 230 (1990), S. 127-134 
    Details
    ISSN: 0027-5107
    Keywords: Adaptive response ; Antimutagenesis ; Comutagenesis ; DNA repair ; E. coli ; SOS response ; Vanillin ; o-Vanillin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(90)90051-5
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  • 2
    Electronic Resource
    Electronic Resource
    The action of 4-hydroxyaminobiphenyl in Escherichia coli: cytotoxic and mutagenic effects in DNA repair deficient strains
    Amsterdam : Elsevier
    Mutation Research Letters 301 (1993), S. 125-134 
    Details
    ISSN: 0165-7992
    Keywords: 4-Aminobiphenyl ; DNA repair ; E. coli ; ^3^2P-Postlabelling analysis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-7992(93)90035-T
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  • 3
    Electronic Resource
    Electronic Resource
    Inhibitory effect of cadmium and mercury ions on induction of the adaptive response in Escherichia coli
    Amsterdam : Elsevier
    Mutation Research/DNA Repair 254 (1991), S. 45-53 
    Details
    ISSN: 0921-8777
    Keywords: Adaptive response ; Cadmium ; Comutagenesis ; DNA repair ; Escherichia coli ; Mercuric ; Mercury
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-8777(91)90039-R
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Correlations among dynamic stress intensity factor, crack velocity and acceleration in brittle fracture (2000)
    Springer
    International journal of fracture 105 (2000), S. 311-320 
    Details
    ISSN: 1573-2673
    Keywords: Dynamic crack propagation ; stress intensity factor ; crack velocity ; crack acceleration ; caustic method ; high-speed photography ; PMMA.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dynamic fracture in PMMA was studied to determine the correlations among dynamic stress intensity factor K ID, crack velocity $$ \dot a $$ and acceleration ä. Specimen geometry, a single-edge-cracked tensile plate with two circular holes, was employed to obtain the crack acceleration, deceleration and re-acceleration process in a single fracture event. K ID was evaluated using the method of caustics in combination with a Cranz-Schardin high-speed camera and correlated with $$ \dot a $$ and ä. The behaviors of K ID $$ \dot a $$ and ä in a SEN specimen were also examined, and the following correlations were obtained: (1) K ID was an increasing function of $$ \dot a $$ , but their relation was not unique. (2) K ID for a constant velocity $$ \dot a $$ was larger when the crack was decelerated than when it was accelerated. (3) K ID was dependent on both $$ \dot a $$ and ä, and K ID for ä=constant could be uniquely related to $$ \dot a $$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007654002732
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  • 5
    Electronic Resource
    Electronic Resource
    Crack veolcity and acceleration effects on dynamic stress intensity factor in polymers (1997)
    Springer
    International journal of fracture 83 (1997), S. 305-313 
    Details
    ISSN: 1573-2673
    Keywords: dynamic crack propagation ; stress intensity factor ; crack velocity ; a cceleration ; polymers ; PMMA ; expoxy ; caustic method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dynamic crack propagations in PMMA and epoxy specimens were studied using the method of caustics in combination with a Cranz-Schardin type high-speed camera. Single-edge-cracked tensile specimens were fractured under pin-loading conditions so that cracks could experience acceleration, deceleration and re-acceleration stages in one fracture process. The dynamic stress intensity factor K ID, crack velocity a and acceleration a were evaluated in the course of crack propagation to examine the effects of a and a on K ID. Results showed that a and a were important factors in changing the values of K ID, and for constant a the decelerating crack had a larger value of K ID than the accelerating or re-accelerating crack. Also, it was found that K ID could be expressed as two parametric functions of and a for PMMA and epoxy specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007387417517
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  • 6
    Electronic Resource
    Electronic Resource
    Fracture Roughness Evolution During Mode I Dynamic Crack Propagation in Brittle Materials (1998)
    Springer
    International journal of fracture 90 (1998), S. 119-131 
    Details
    ISSN: 1573-2673
    Keywords: Dynamics ; roughness ; stress intensity ; crack velocity ; acceleration ; high speed photography ; caustic method ; photoelastic method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The evolution of roughness RMS during dynamic fracture in thin plates of epoxy (Araldite B) was studied in relation to important fracture parameters such as crack velocity a, acceleration and deceleration ä and mode I stress intensity factors ( KID ). Dual-focus high speed photography was carried out to evaluate values of KID by the caustic ( KID ( C ) ) and photoelastic ( KID ( P ) ) methods simultaneously. A specially designed jig applied successive tensile loadings to specimens which resulted in cyclic change of a and ä. The changes of a, RMS and KID are shown to be qualitatively similar with respect to the value of a. Quantitatively, a typical result showed that the position of the first maximum value of a came 7 mm behind the first loading axis, while that of KID ( P ), RMS and KID, ( C ) appeared on the fracture surface 7 mm, 15 mm, and 25 mm behind the axis, respectively. The agreement between KID ( C ) and KID ( P ) was acceptable except for data around the first loading axis. Discussions are given on the uniqueness problem of a and KID.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007443419107
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic crack propagation and unloading behavior of brittle polymers (1999)
    Springer
    International journal of fracture 96 (1999), S. 347-360 
    Details
    ISSN: 1573-2673
    Keywords: Dynamic crack propagation ; unloading behavior ; stress intensity factor ; crack velocity ; unloading rate ; brittle polymers ; epoxy ; PMMA ; homalite-100 ; caustic method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The method of caustics in combination with a Cranz–Schardin high-speed camera was utilized to study dynamic crack propagation and unloading behavior of epoxy, PMMA and Homalite-100 specimens. Dynamic stress intensity factor K ID and crack velocity $$\dot a$$ were evaluated in the course of crack propagation. Caustic patterns at the loading points were also recorded to estimate load P applied to the specimen. Unloading rate $$\dot P$$ , the time derivative of P, was determined as a function of time t, and its time correlation with K ID or $$\dot a$$ was examined. The findings showed that the change in $$\dot P$$ was qualitatively in accord with the change in K ID or $$\dot a$$ . However, there existed slight differences among the values of t giving the maximum $$\dot P$$ , $$\dot a$$ and K ID, so that their order was $$\dot a$$ , $$\dot P$$ and K ID.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018697630909
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic fracture instability in glassy polymers as studied by ultrasonic fractography (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 25-32 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Ultrasonic fractography studies were performed on poly(methyl methacrylate) of high molecular weight. The transient fracture velocity change at the slow-to-fast transition during discontinuous propagation has been measured precisely. Fast fracture starts with a characteristic velocity which falls in a narrow range between 90 to 150 m/s, nearly independent of the loading speeds and the specimen temperature from -50 to 40°C. Parallel double-cantilever-beam specimens exhibited stick-slip type propagation whose velocity change was also evaluated. In these specimens, the fast fracture abruptly slows down to speeds on the order of 10° m/s. These intermediate velocities have never been obtained in the slow-to-fast transition. Velocity measurements under hydrostatic pressure have shown that fracture velocities decrease significantly with increasing pressure, and that the slow-to-fast transition tends to disappear at a pressure between 5 and 10 MPa. Models have been presented concerning the mechanism of the slow-to-fast transition, crazing and cracking under superposed cyclic stress field, and the relationship between dynamic toughness and fracture velocity in this material.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760270105
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  • 9
    Electronic Resource
    Electronic Resource
    Plate and column efficiencies of continuous rectifying columns for binary mixtures (1971)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 17 (1971), S. 1141-1152 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690170520
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  • 10
    Electronic Resource
    Electronic Resource
    Helix-Coil transition of plasmid dna by adiabatic differential scanning microcalorimetry (1988)
    New York : Wiley-Blackwell
    Biopolymers 27 (1988), S. 1917-1925 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Adiabatic differential scanning microcalorimetry, which provides curves of the heat capacity vs temperature, was carried out for the DNA of plasmid pJL3-TB5 (5277 base pairs in length). The calorimetry curve shows nine peaks ranging from 81 to 96°C in 1 × SSC buffer at a heating rate of 0.25°C, due to the stepwise helix-coil transition of the DNA along the molecular chain. The theoretical melting curve, which can be constructed by calculation from the entire nucleotide sequence of the plasmid DNA by the helix-coil transition theory, is then compared with the calorimetry curve. The two curves resemble each other remarkably well, particularly when a parameter for the methylated adenine residues at GATC sites by Dam methylase is used appropriately. This allows us to assign each peak in the calorimetry curve to the melting of the respective regions of the plasmid DNA sequence. The local stability of the helix-coil transition along the DNA chain is closely related to the functional regions coded by pJL3-TB5, such as genes, transcriptional promoters, and particular sites generated by recombination of two different sequences in vivo and in vitro.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360271206
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