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  • 1
    Online Resource
    Online Resource
    Basel :S. Karger AG,
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (257 pages)
    Edition: 1st ed.
    ISBN: 9783318013108
    Series Statement: Contributions to Microbiology Series ; v.13
    Language: English
    Note: Cover -- Contents -- In Remembrance of Rudolf Virchow (1821-1902) -- Foreword -- General Aspects -- In Memoriam of Rudolf Virchow: A Historical Retrospective Including Aspects of Inflammation, Infection and Neoplasia -- Abstract -- Note of Comment on Rudolf Ludwig Carl Virchow -- Who Was Rudolf Ludwig Carl Virchow? -- Virchow and Tumor Pathology -- Virchow's Theories about the Impact of Infection and Inflammation on Oncogenesis -- Inflammation -- Syphilis and Tuberculosis -- Generalization and 'Infection ' -- The 'Krebsbacillus' -- Discussion -- Acknowledgements -- References -- Aneuploidy and Cancer: From Correlation to Causation -- Abstract -- Cancer Is Not Heritable -- Long Neoplastic Latencies -- Non-Mutagenic Carcinogens Cause Cancer -- Karyotype-Phenotype Variations at Rates that Are Orders Higher than Mutation -- Cancer-Specific Aneuploidies -- Cancers Have Complex Phenotypes -- Nonselective Phenotypes of Cancer Cells -- No Carcinogenic Genes in Cancer -- A New, Chromosomal Evolution Theory of Carcinogenesis -- Testing Specific Predictions of the Chromosomal Theory against Competing Claims by Genetic Theories of Cancer -- Carcinogens Function as Aneuploidogens -- Aneuploidy Is Inherently Variable and Thus Sufficient to Catalyze the Evolution of Cancer-Specific Chromosome Patterns -- Carcinogenesis Independent of Somatic Mutation -- Explanatory Value of the Chromosomal Theory of Cancer -- Cancer Is Not Heritable -- Long Neoplastic Latencies -- High Rates of Karyotype-Phenotype Variations and the Origin of Immortality -- Cancer-Specific Aneuploidies -- Complex Phenotypes -- Nonselective Phenotypes -- Conclusions -- Appendix -- The Achilles Heels of the Mutation-Cancer Theory -- Acknowledgments -- References. , Adult Stem Cell Theory of the Multi-Stage, Multi-Mechanism Theory of Carcinogenesis: Role of Inflammation on the Promotion of Initiated Stem Cells -- Abstract -- 'Initiation', 'Promotion' and 'Progression' Concept of Carcinogenesis -- What Is that 'Initiated' Cell? -- Initiation: Is It the Induction of 'Immortalization' of a Normal,'Mortal' Cell or the Inhibition of 'Mortalization' of a Normal 'Immortal' Adult Stem Cell? -- Characteristics of Adult Stem Cells: Clues to the Stem Cell Hypothesis of Carcinogenesis -- Are There Adult Stem Cell Markers? -- Role of Gap Junctional Intercellular Communication in Normal Growth Control and Its Dysfunction in Carcinogenesis -- Cancer Stem Cells: Something New or a Newly Discovered Old Prediction -- Stem Cells, Oncogenic Viruses, and Cancer -- Inflammation,Tumor Promotion and Carcinogenesis -- Implications of the Stem Cell Theory for Cancer Chemoprevention and Chemotherapy: Cancer as a 'Treatable Chronic Disease' -- Conclusion -- References -- Specific Pathogens -- Helicobacter pylori and Gastric Neoplasia -- Abstract -- Epidemiology of Gastric Carcinoma -- Epidemiology of H. pylori Infection -- Gastric Carcinogenesis Cascade -- Molecular Events during Gastric Carcinogenesis -- Bacterial Factors -- cagA -- vacA -- babA2 -- Host Factors -- Prevention of Gastric Adenocarcinoma by H. pylori Eradication -- MALT Lymphoma -- References -- Schistosomiasis and Neoplasia -- Abstract -- Life Cycle of Schistosoma -- Epidemiology of Schistosomiasis -- Diagnosis of Schistosomiasis -- Schistosomiasis and Bladder Cancer -- Epidemiological Evidence -- Experimental Evidence -- Histopathological Evidence -- Pathogenesis of Bladder Cancer in S. hematobium Chronic Inflammation -- Urinary Tract Infection -- Altered Carcinogen Metabolism -- Disturbed Carcinogen Activation in Schistosomiasis. , Disturbed Carcinogen Inactivation in Schistosomiasis -- Molecular Mechanisms -- Tumor Suppressor Genes -- The p53 Tumor Suppressor Gene -- Retinoblastoma Tumor Suppressor Gene -- Chromosome 9 -- Microsatellite Instability -- Oncogenes -- H-ras -- Bcl-2 Gene -- Schistosomiasis and Colorectal Cancer -- Schistosomiasis and Liver Cancer -- Schistosomiasis and Prostate Cancer -- Schistosomiasis and Cancer of Other Sites -- References -- Relevant Oncogenic Viruses in Veterinary Medicine: Original Pathogens and Animal Models for Human Disease -- Abstract -- Viral Pathogens of Veterinary Importance -- Retroviruses -- Poultry -- Sheep -- Cat -- Cattle -- Fish -- Herpesviruses -- Papillomaviruses -- Mechanisms of Papillomavirus-Induced Oncogenesis -- Cattle -- Horse -- Dog -- Tumor Viruses of Animals as Models of Human Oncogenesis -- Conceptual Work and Pioneering Studies in Oncology -- Tumor Induction by Viral and Cell-Derived Oncogenes and Additional Oncogenic Strategies of Retroviruses -- Importance of Cofactors in Virus-Induced Oncogenesis -- Abortive,Nonlytic Infections Can Promote Cancer Development -- Animal Models for Human Malignancies -- Zoonosis and Host-Species Exchange-Associated Oncogenesis -- Acknowledgements -- References -- Infection, Inflammation and Neoplasia -- The Inflammatory Tumor Microenvironment and Its Impact on Cancer Development -- Abstract -- Tumor Micro-Environment -- The Inflammatory Tumor Micro-Environment -- Acute versus Chronic Inflammation -- Clinical Association between Chronic Inflammation and Cancer -- Experimental Studies Linking Inflammation and Cancer -- Inflammatory Cell-Mediated Modulation of Neoplastic Progression -- Direct Effect on Neoplastic Cells -- Indirect Effect on Neoplastic Cells -- Concluding Remarks and Perspectives -- Acknowledgements -- References. , Co-Opting Macrophage Traits in Cancer Progression: A Consequence of Tumor Cell Fusion? -- Abstract -- Introduction -- Cell Fusion in Normal and Cancerous Tissues -- Putative BMT Tumor Cell Hybrids in Humans -- Gene Expression in Artificial Fusion Hybrids -- Beta1,6-Branched Oligosaccharides and Coarse Vesicles in Human BMT Tumor Hybrids -- Beta1,6-Branched Oligosaccharides and Coarse Vesicles Are Common in Human Cancers -- Conclusions -- Acknowledgements -- References -- Carcinogenesis Driven by Bone Marrow-Derived Stem Cells -- Abstract -- Instruction of Stem Cell Trans-Differentiation -- What Happens if BMDC Trans-Differentiation Is Directed by a Faulty Blueprint -- What Happens if Tumor Tissue Is the Blueprint for BMDC Trans-Differentiation? -- Conclusion -- Acknowledgments -- References -- Chemokine-Directed Metastasis -- Chemokine-Directed Metastasis -- Abstract -- Angiogenesis -- ELR Positive CXC Chemokines Promote Angiogenesis -- The Role of ELR-Positive CXC Chemokines in Tumorigenesis -- In General, Non-ELR Positive CXC Chemokines Are Inhibitors of Angiogenesis -- CXCR3 Appears to Be the Major Receptor for Non-ELR-Positive CXC Chemokine-Mediated Inhibition of Angiogenesis -- Non-ELR Positive CXC Chemokines Attenuate Angiogenesis and Reduce Tumorigenesis -- Evidence that Chemokines Are Involved in Tumor Cell Invasion -- Evidence that Chemokines Regulate the Pattern of Organ-Specific Metastasis of Cancer -- Conclusion -- Acknowledgements -- References -- Involvement of Chemokine Receptors in Organ-Specific Metastasis -- Abstract -- Chemokines -- Chemokines and Metastasis -- Mechanism of Action of CXCR4 in Cancer -- CXCR4 in Breast Cancer -- Conclusion and Future Directions -- References -- Visualization of Tumor Cell Extravasation -- Abstract -- Tumor Cell Extravasation -- Tumor Cell-Endothelial Cell Interactions during Extravasation. , Acknowledgements -- References -- Options for Visualizing Metastatic Disease in the Living Body -- Abstract -- Applications of Whole-Body in vivo Imaging Techniques -- Computed Tomography -- Magnetic Resonance Imaging -- Nuclear Medicine Modalities (PET/SPECT) -- Optical Imaging -- Clinical Imaging of Metastases -- In vivo Imaging of Metastases in Animal Models -- Models of Metastasis Utilizing Implanted Tumor Cells -- Choice of Imaging Techniques for Visualization of Metastasizing Tumor Cells in Animal Models -- Future Outlook -- References -- Outlook and Perspectives -- Infection, Inflammation and Neoplasia: An Interdisciplinary Challenge -- Abstract -- Inflammation, Wound Healing, and Carcinogenesis -- Multifunctionality of Cytokines and Chemokines -- 'Wounds that Never Heal' and Carcinogenesis -- Chemokine-Mediated Cell Function Inhibition - Where, Which and How? -- Cancer and Inflammation: From Epidemiological Perspectives to Molecular Mechanisms -- Infection and Cancer -- Interdisciplinary Challenge -- References -- Author Index -- Subject Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- R -- S -- T -- U -- V -- W.
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  • 2
    Keywords: Forschungsbericht ; Amazonas ; Mündungsgebiet ; Atlantischer Ozean Süd ; Spurenmetall ; Gelöster organischer Stoff ; Stoffeintrag
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (63 Seiten, 3,86 MB) , Illustrationen, Diagramme, Karten
    Series Statement: METEOR-Berichte
    Language: German
    Note: Abweichender Titel: Meteor-Berichte, Cruise 147, Las Palmas - Belém, April 09 - May 21 2018 , Förderkennzeichen: 458/2017/CB/Te Leitstelle CEN, Uni-Hamburg
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  • 3
    ISSN: 1572-977X
    Keywords: cations ; non‐conservative ; nutrients ; primary producers ; tides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sodium, potassium, magnesium, calcium and physico‐chemical parameters were monitored for one year in a mangrove tidal creek near Bragança, North Brazil, to determine their tidally induced and seasonal variations and the main parameters controlling the concentration of these cations. On a daily basis, cation concentrations showed a strong tidal rhythm due to the mixing of estuarine and mangrove waters. Mean concentrations were highest at the end of the dry season (December 1996) and lowest (April 1997) towards the end of the rainy season. Average values over one year were: Na+ = 329± 118mM, K+ = 6.9±2.5 mM, Mg++=37 ±14 mM and Ca++= 6.9±2.4 mM. Dissolved oxygen concentration was higher during the dry season due to enhanced aquatic primary production, with a maximum daily average value of 8.5 mg/L in July 1996, and a minimum value of 4 mg/L in June 1997. Cation concentrations were transformed relating them to the respective average values in ‘standard’ seawater at salinity 35. Although cation concentrations and salinity tightly correlated, this standardization showed that the concentrations of K+, Ca++ and Mg++ did not depend solely on salinity and reflected the seasonal variation in aquatic primary production. It also allowed the discrimination of their sources (marine, riverine and groundwater). Thermodynamic equilibrium calculations indicate that phytoplankton may be regulating the concentration of these cations in the water column indirectly by inducing precipitation through pH increase and directly through metabolic uptake.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Mangroves and salt marshes 3 (1999), S. 185-195 
    ISSN: 1572-977X
    Keywords: groundwater ; hydrology ; primary producers ; tides ; variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During the dry season, dissolved inorganic nutrients and organic carbon (DOC) in a mangrove tidal creek (Bragança, North Brazil) presented a clear tidal signature: silicate, phosphate, ammonium and DOC covaried with salinity, with minima at high tide and maxima at low tide. Hydrodynamical calculations explained most diel variability as dilution of nutrient‐rich groundwater input by estuarine water. Creek nutrients tended to lower concentrations towards the end of the dry season, probably due to changes in groundwater dynamics. Ammonium was about 44% higher in the night than during the day, while silicate, phosphate nitrate + nitrite showed differences 〈 5%, indicating preferential autotrophic uptake of ammonium as nitrogen source. Nitrification and/or nitrogen fixation are probably sources of nitrate + nitrite, which contributed only 12% to the dissolved inorganic nitrogen pool. Dissolved oxygen (7%) and DOC (11%) were lower during the night, suggesting the existence of a labile, algal‐derived DOC pool. There is a loose coupling between aquatic primary production, groundwater dynamics and tidal regime.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2019-09-23
    Description: Increasing concentrations of atmospheric carbon dioxide are projected to lead to an increase in sea surface temperatures, potentially impacting marine ecosystems and biogeochemical cycling. Here we conducted an indoor mesocosm experiment with a natural plankton community taken from the Baltic Sea in summer. We induced a plankton bloom via nutrient addition and followed the dynamics of the different carbon and nitrogen pools for a period of one month at temperatures ranging from 9.5 °C to 17.5 °C, representing a range of ± 4 °C relative to ambient temperature. The uptake of dissolved inorganic carbon (DIC) and the net build-up of both particulate (POC) and dissolved organic carbon (DOC) were all enhanced at higher temperatures and almost doubled over a temperature gradient of 8 °C. Furthermore, elemental ratios of carbon and nitrogen (C:N) in both particulate and dissolved organic matter increased in response to higher temperatures, both reaching very high C:N ratios of 〉30 at +4 °C. Altogether, these observations suggest a pronounced increase in excess carbon fixation in response to elevated temperatures. Most of these findings are contrary to results from similar experiments conducted with plankton populations sampled in spring, revealing large uncertainties in our knowledge of temperature sensitivities of key processes in marine carbon cycling. Since a major difference to previous mesocosm experiments was the dominant phytoplankton species, we hypothesize that species composition might play an important role in the response of biogeochemical cycling to increasing temperatures.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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  • 6
    Publication Date: 2018-12-11
    Description: Oxygen-deficient waters in the ocean, generally referred to as oxygen minimum zones (OMZ), are expected to expand as a consequence of global climate change. Poor oxygenation is promoting microbial loss of inorganic nitrogen (N) and increasing release of sediment-bound phosphate (P) into the water column. These intermediate water masses, nutrient-loaded but with an N deficit relative to the canonical N:P Redfield ratio of 16:1, are transported via coastal upwelling into the euphotic zone. To test the impact of nutrient supply and nutrient stoichiometry on production, partitioning and elemental composition of dissolved (DOC, DON, DOP) and particulate (POC, PON, POP) organic matter, three nutrient enrichment experiments were conducted with natural microbial communities in shipboard mesocosms, during research cruises in the tropical waters of the southeast Pacific and the northeast Atlantic. Maximum accumulation of POC and PON was observed under high N supply conditions, indicating that primary production was controlled by N availability. The stoichiometry of microbial biomass was unaffected by nutrient N:P supply during exponential growth under nutrient saturation, while it was highly variable under conditions of nutrient limitation and closely correlated to the N:P supply ratio, although PON:POP of accumulated biomass generally exceeded the supply ratio. Microbial N:P composition was constrained by a general lower limit of 5:1. Channelling of assimilated P into DOP appears to be the mechanism responsible for the consistent offset of cellular stoichiometry relative to inorganic nutrient supply and nutrient drawdown, as DOP build-up was observed to intensify under decreasing N:P supply. Low nutrient N:P conditions in coastal upwelling areas overlying O2-deficient waters seem to represent a net source for DOP, which may stimulate growth of diazotrophic phytoplankton. These results demonstrate that microbial nutrient assimilation and partitioning of organic matter between the particulate and the dissolved phase are controlled by the N:P ratio of upwelled nutrients, implying substantial consequences for nutrient cycling and organic matter pools in the course of decreasing nutrient N:P stoichiometry.
    Type: Article , PeerReviewed
    Format: text
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  • 7
    Publication Date: 2016-04-29
    Description: The effects of temperature and pCO2 on the development of bacterial communities were investigated in mesocosm experiments with Baltic Sea water, during a diatom bloom in autumn and during a cyanobacterial bloom in summer. We measured prokaryotic cell numbers and activity and used 454 pyrosequencing to compare the development of the bacterial community composition (BCC) and to identify the major bacterial taxa. Organic matter dynamics were assessed to differentiate between direct effects and indirect phytoplankton induced effects. The development of BCC followed well-known bloom dynamics. A principle coordinate analysis (PCoA) of bacterial OTUs (operational taxonomic units) revealed that phytoplankton succession and temperature were the major bacterial community structuring variables whereas only a very weak impact of pCO2 was found. This was corroborate by the trends in bacterial bulk parameters. However, significant effects of pCO2 on the relative abundance of individual dominant OTUs occurred. Our results suggest that increasing pCO2 only slightly affects the development of overall bacterial community composition but impacts specific bacterial groups which might influence also particular organic matter degradation processes.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 8
    Publication Date: 2023-11-29
    Description: Iron is an essential micronutrient often limiting the growth of marine microorganisms in wide areas of the world’s oceans. In high concentrations, iron, by contrast, is potentially toxic and usually leads to irreversible cell encrustation followed by cell death. To counteract both, microorganisms have evolved the strategy of producing organic iron-binding molecules, so called iron-ligands, enabling them to improve the bioavailability and uptake of iron as well as to mitigate its potentially toxic effects. Hydrothermal vents are among the major sources of iron in the oceans. These dynamic habitats host a variety of metabolically highly specialized and versatile microbes that not only have to cope with partially high iron concentrations but may also be able to mediate the availability of inorganic hydrothermal iron by actively producing iron-ligands. However, hardly any information exists to-date describing the impact of increasing iron concentrations on hydrothermal plume microbial communities and their potential to form iron-ligands. We therefore set up microcosm experiments with hydrothermal plume material in artificial seawater along an iron gradient ranging from 0 to 10 mM. We found that the microbial community at low iron concentrations (0.1 to 100 μM) differs significantly from that found in the original non-treated plume sample, allowing a certain group of Epsilonproteobacteria to become dominant (up to 93% of the overall community). The microbial community detected at 10 mM is by contrast more similar to that found in the original plume sample and consists mainly of one gammaproteobacterial group (up to 97% of the overall community). We further analyzed these results in the context of ligand concentrations and structural diversity and found indications for microbially mediated iron-ligand formation. This is the first holistic experimental approach linking studies of hydrothermal vent microbial community composition with the geochemistry involved in organic iron-ligand formation.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
    Publication Date: 2013-06-19
    Description: Reactive iron and organic carbon are intimately associated in soils and sediments. However, to date, the organic compounds involved are uncharacterized on the molecular level. At redox interfaces in peatlands, where the biogeochemical cycles of iron and dissolved organic matter (DOM) are coupled, this issue can readily be studied. We...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 10
    Publication Date: 2021-04-23
    Type: Conference or Workshop Item , NonPeerReviewed
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