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  • 1
    Call number: S 99.0121(75)
    In: Mitteilungen
    Type of Medium: Series available for loan
    Pages: 151 S.
    ISBN: 3906467368
    Series Statement: Mitteilungen / Institut für Geodäsie und Photogrammetrie 75
    Classification:
    Geodetic Theory and Modeling
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Description / Table of Contents: The weathering of historical buildings and, indeed, of monuments and sculptures of natural stone is a problem that has been encountered for hundreds of years. However, a dramatic increase in deterioration in the structure of our built heritage has been observed during the past century. To understand the complex interaction that the stone in a building suffers with its near environment (the building) and the macro environment (the local climate and atmospheric conditions) requires an interdisciplinary approach and the application of many different theoretical, experimental and empirical resources provided by the geosciences, chemistry, material sciences, biology and construction engineers. The protection of our architectural heritage has both cultural and historical importance, as well as substantial economic and ecological value. Large sums of money are being spent world-wide on measures for the preservation of monuments and historical buildings. Optimization of damage analysis procedures and damage process controls, as well as the development of monitoring and early warning systems for damage prevention, is needed. The past several decades has seen an unprecedented level of research activity in this area, the results of which are often difficult to access. This volume is intended to provide an integrated approach to the study of the deterioration of geomaterials, making the research available to a wide international audience. Natural Stone, Weathering Phenomena, Conservation Strategies and Case Studies comprises thirty chapters divided into six sections: weathering of natural building stones; weathering processes; fabric dependence of physical properties; biodeterioration; quality assessment and conservation of stones; and environmental conditions. Review articles are combined with reports on recent progress in the various research fields, authored by a comprehensive team of international contributors. The volume will be of interest to all those involved in the protection of our built heritage, particularly geoscientists, material scientists, construction engineers, architects and stone conservators.
    Pages: Online-Ressource (VII, 448 Seiten)
    ISBN: 1862391238
    Language: English
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  • 3
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 313-317 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A digital image tracking algorithm based on Fourier-transform cross-correlation has been developed to correct for instrumental drift in scanning tunneling microscope images. A technique was developed to eliminate cumulative tracking errors associated with fractional pixel drift. This tracking algorithm was used to monitor conductance changes associated with different conformations in conjugated molecular switch molecules and to trace the diffusion of individual benzene molecules on Ag{110}. Molecular motions have been tracked for up to 25 h (400 images) of acquisition time. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The acrylamide gelification process is a fast, inexpensive, reproducible, and easily scaled up chemical method for obtaining nanopowders of BaZrO3 that can be used for sintering crucibles and many electronic applications. This method enables the production of 100 g of high-purity powders in one run, using simple laboratory equipment and low-cost raw materials. The gelification process, synthesis temperature, and gas conditions required for obtaining high-quality powders were the subjects of the present study. Fine powders were sintered to full density at 1450°C, making the fabrication of BaZrO3 crucibles possible for many laboratories.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The microsporidial genus, Brachiola, contains three species: the type species Brachiola vesicularum (identified from an AIDS patient) and two species transferred from the genus Nosema, becoming Brachiola connori and Brachiola algerae. A developmental feature of the genus Brachiola is the “thickened” plasmalemma from sporoplasm through sporoblast stage. The sporoplasm has been reported to have a thick plasmalemma at 1-h postextrusion. The purpose of this investigation was to observe B. algerae spores before, during and after germination to determine if the plasmalemma is thick at the point of extrusion and if not, when and how it forms. New understandings regarding the polar filament position inside the spore, places it outside the sporoplasm proper with the sporoplasm limiting membrane imaginations surrounding it. These invaginations, present a possible location for aquaporins. The multilayered interlaced network (MIN), a new organelle (possibly of Golgi origin from the sporoblast), was observed inside the spore and sporoplasm; it formed an attachment to the end of the extruded polar tube and contributed to the thickening of the sporoplasm plasmalemma. A thin “unit limiting membrane”, present on the sporoplasm at the time of extrusion, is connected to the MIN by many cross-connections forming the “thick blistered” surface by 30 min-postextrusion.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Distribution patterns of benthic foraminiferal faunas from ODP Leg 170 Sites 1041 and 1042 show that the Costa Rican convergent margin subsided from coastal to abyssal depth from Middle Miocene to Present. This favours the model of a margin undergoing active subduction erosion. We propose that subduction erosion leads to the removal of material from the base of the forearc wedge and, as a consequence, to progressive subsidence of the forearc. A mean subsidence rate is estimated to be approximately 0.4 mm yr−1.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 61 (2002), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Common carp Cyprinus carpio (n=24) from the upper Danube (wild or feral forms, scaleless varieties) as well as Japanese koi shared the identical mtDNA haplotype (565 bp). In contrast, Amur River carp (n=5) exhibited unique haplotypes, 1–12 bp divergent from the Danubian one. These results support an Asian origin and single introduction or domestication event leading to the present diversity of common carp in Europe, as well as the ornamental Japanese koi.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 212 (2002), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In the present study streptococci of serological group B isolated from canines (n=48) and felines (n=7) were comparatively investigated with group B streptococci from humans and bovines for cultural, biochemical and serological properties for antibiotic resistancies and by molecular analysis. An identification was performed with group B-specific antiserum, biochemical reactions, by PCR amplification and subsequent endonuclease digestion of the 16S rRNA gene and by amplification of species-specific parts of the 16S rDNA the 16S–23S rDNA intergenic spacer region and the CAMP factor gene cfb. Phenotypic similarities of group B streptococci of canine and feline origin with group B streptococci from humans and differences to group B streptococci of bovine origin could be observed in lactose fermentation, serotype patterns, pigmentation, growth properties of the bacteria in fluid medium and soft agar, hemagglutination reactions and in minocycline and tetracycline resistance. A negative hyaluronidase plate test, a hyl B amplicon with a size of 4.6 kb and an insertion sequence 1548 could be observed among canine, feline and human group B streptococci of serotype III. The remaining hyaluronidase positive strains, also including all isolates of bovine origin, had a hyl B gene with a size of 3.3 kb. Further genotypic differences could be observed in the occurrence of the genes lmb and scp B which appeared generally among canine, feline and human group B streptococci, but less pronounced among bovine isolates of this species. According to the presented data group B streptococci of canine and feline origin seemed to be more related to human than to bovine isolates of this species possibly indicating some epidemiological relation.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Bactericidal/permeability-increasing protein (BPI) of neutrophils is a lipopolysaccharide (LPS)-binding antibacterial protein with specificity for Gramnegative bacteria. BPI binding to the bacterial surface rapidly triggers potentially reversible bacterial growth inhibition and alterations of the outer membrane and, later, disruption of the inner membrane and lethal injury. Initial effects include selective OmpR-dependent changes in the synthesis of outer membrane porins (OmpF and OmpC). Because OmpR is a global transcriptional regulator, we have examined its possible role in responses of E. coli to sublethal injury caused by BPI. Early (〈15 min) reversible effects of BPI on bacterial colony-forming ability and outer membrane permeability were virtually identical in isogenic wild-type (wt) and ompR−E. coli. Both strains could repair the outer membrane permeability barrier after Mg2+-induced displacement of bound BPI. However, OmpR was essential for the ability of E. coli to tolerate low doses of BPI and escape the progression of sublethal to lethal damage. Scanning electron microscopy revealed that BPI treatment produced greater membrane perturbations in the ompR− strain, apparent even before lethal injury. These findings suggest that the fate of E. coli exposed to BPI depends on both OmpR-independent mechanisms engaged in outer membrane repair and OmpR- dependent processes that modulate porin synthesis and retard progression of injury from the outer to the inner membrane.
    Type of Medium: Electronic Resource
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