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  • 1
    Online Resource
    Online Resource
    Ecological Assessment of Selenium in the Aquatic Environment. (2010)
    Milton :Taylor & Francis Group,
    Details
    Keywords: Selenium -- Environmental aspects -- Congresses. ; Electronic books.
    Description / Table of Contents: Filled with practical guidance on how to conduct selenium risk assessments in the aquatic environment, this book offers the latest information on assessment techniques, gives the current state of contamination in industrialized countries, and raises awareness for developing nations. Written by leading experts, it describes best practices for designing experiments to collect information on aquatic effects and trophic transfer of selenium for risk assessments, presents numerous case studies both US and international, and gives insight as to how current and future ecosystems may or may not be affected.
    Type of Medium: Online Resource
    Pages: 1 online resource (370 pages)
    Edition: 1st ed.
    ISBN: 9781439826782
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=565841
    DDC: 577.6/275
    Language: English
    Note: Front cover -- Contents -- List of Figures -- List of Tables -- Acknowledgments -- About the Editors -- Workshop Participants -- Chapter 1. A Pellston Workshop on Selenium in the Aquatic Environment -- Chapter 2. Executive Summary -- Chapter 3. What You Need to Know about Selenium -- Chapter 4. Environmental Sources, Speciation, and Partitioning of Selenium -- Chapter 5. Bioaccumulation and Trophic Transfer of Selenium -- Chapter 6. Selenium Toxicity to Aquatic Organisms -- Chapter 7. Selenium Risk Characterization -- Appendix A: Selected Case Studies of Ecosystem Contamination by Se -- Appendix B: Commentary: Persistence of Some Fish Populations in High-Se Environments -- Index -- Back cover.
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    GEOMAR EBL
  • 2
    Electronic Resource
    Electronic Resource
    Problems with the use of terracotta clay saucers as phosphorus-diffusing substrata to assess nutrient limitation of epilithic algae (2001)
    Oxford UK : Blackwell Science Ltd
    Freshwater biology 46 (2001), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. We examined the diffusion properties of terracotta clay saucers, of types often used as components in phosphorus-diffusing substrata for investigating nutrient limitation of epilithic algae.2. Laboratory experiments showed that phosphorus diffusion was low and inconsistent (0.06–2.6 mg P day−1) through clay saucers filled with agar containing orthophosphate. Similarly, in situ release of phosphorus from two types of terracotta clay saucers (Australian and Italian) was variable (2–8 mg P day−1; 5–25%) under three flow regimes (0, 0.1 and 0.3 m s−1) over 30 days, with most phosphorus being released during the first day. Clogging of pores by agar appears to prevent the diffusion of phosphorus through the terracotta clay saucers. However, the two types of terracotta clay saucer also irreversibly sorbed large quantities of phosphorus (40–140 mg P).3. Individual saucers can have markedly different physical and chemical properties both within and among terracotta types. Terracotta saucers also contain large quantities of iron, calcium and aluminium that are known binding agents for phosphorus. Variability in saucer composition and diffusion properties makes treatments difficult to replicate and weakens comparisons between studies that have used terracotta with different clay composition and manufacture.4. We recommend that phosphorus-diffusing substrata should not be constructed from terracotta clay components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2001.00698.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Selenium Associations in Estuarine Sediments: Redox Effects (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 275-282 
    Details
    ISSN: 1573-2932
    Keywords: selenium ; sediment ; estuaries ; sequential extraction ; redox potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Selenium (Se) is a contaminant of concern in environments affected by discharges from smelting and coal-burning industries. Experiments have been performed to investigate the phase associations of selenium in contaminated sediments under a range of controlled redox conditions. In this study, Se sediment associations were examined using the BCR sequential extraction technique after stabilisation at different redox states. It was shown that although most of the sediment-bound Se is associated with the operationally-defined "organic/sulfide" fraction, as the measured redox potential of the system is increased, more Se moves into the "exchangeable" and "iron/manganese oxyhydroxide" fractions. In these fractions, contaminants can be expected to be more bioavailable. As the mass of Se absorbed to sediments is typically at least an order of magnitude higher than the mass dissolved in porewaters, significant Se exposure may result from oxidative shifts in Se associations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018337928312
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Selenium associations in estuarine sediments: Redox effects (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 275-282 
    Details
    ISSN: 1573-2932
    Keywords: selenium ; sediment ; estuaries ; sequential extraction ; redox potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Selenium (Se) is a contaminant of concern in environments affected by discharges from smelting and coal-burning industries. Experiments hate been performed to investigate the phase associations of selenium in contaminated sediments under a range of controlled redox conditions. In this study, Se sediment associations were examined using the BCR sequential extraction technique after stabilisation at different redox states. It was shown that although most of the sediment-bound Se is associated with the operationally-defined “organic sulfide” fraction, as the measured redox potential of the system is increased. more Se moves into the “exchangeable” and “iron manganese oxy hydroxide” fractions. In these fractions. contaminants can be expected to be more bioavailable. As the mass of Se absorbed to sediments is typically at least an order of magnitude higher than the mass dissolved in porewaters. significant Se exposure may result from oxidative shifts in Se associations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406867
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Comparison bilaterally of lingual and facial arterial rami in the mandibulo-perimandibular complex: Arterioradiographic models for surgical consideration (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Clinical Anatomy 6 (1993), S. 71-80 
    Details
    ISSN: 0897-3806
    Keywords: mandibular complex ; lingual-facial rami bilaterally ; radioarteriography ; mandibulo-perimandibular surgery ; Life and Medical Sciences ; Miscellaneous Medical
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Anatomic illustrations and arterioradiograms of the facial, submental, lingual and sublingual arteries, and their primary branches in the mandibulo-perimandibular complex are routinely demonstrated unilaterally; illustration and comparison bilaterally have not been documented. The unilateral illustration mode erroneously implies arterioanatomic similarity contralaterally. Mandibulo-perimandibular arteries in 50 stillborn human fetuses and 50 human adult cadavera were assessed. Head and neck arteries of fetal subjects were perfused with a radiopaque perfusant via the ascending thoracic aorta. Then the entire mandibular complex and tongue of each fetus was excised en bloc and radiographed from above the tongue. The radiograms showed 1) that sublingual and submental arteries and their primary rami differ in size, number, arrangement, and distribution unilaterally, as well as bilaterally and 2) that the entire mandibular body complex (including periosteum, cortex, spongiosa, and dentoparadontal structures) receives substantial sources of supply via the facial, submental, and sublingual arteries (extrinsic sources). The facial and lingual arteries and their ramifications in the adult mandibular complex were demonstrated by gross dissection. Comparison between fetal and adult mandibular arterial anatomies showed remarkable similarity. Furthermore, the results of this arterio-anatomic assessment and the results of concurrent, independent, experimental bone surgical studies (Hadidi, Doctoral dissertation, Medical College of Wisconsin, Milwaukee 1985) favor a growing opinion that rami from the facial, submental, and sublingual arteries (extrinsic sources) to the mandibular body are more essential to its need than is commonly believed. © 1993 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ca.980060202
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Topographic, microscopic, radiographic, and computerized morphometric studies of the human adult edentate mandible for oral implantologists (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Clinical Anatomy 4 (1991), S. 327-340 
    Details
    ISSN: 0897-3806
    Keywords: edentate mandible ; skeletal morphology ; radiology ; computerized digital morphometry ; Life and Medical Sciences ; Miscellaneous Medical
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Many edentate human mandibles obtained at random from cadaveric subjects of different ages were cleansed of their soft tissue coverings (macerated) and then divided into groups based upon alveolar process resorption differences. Each mandible was transected at five locations corresponding to prior sites of the molar and premolar teeth. The medial surface area of each section and its cortical and medullary components were accurately measured by computerized digital morphometry. Skeletomorphologic details were examined by gross, microscopic, and radiographic methods. Images made visible by the three methods were compared. Comparison clearly indicated that images of cortical thickness peripherally, trabecular bone density centrally, and the differences in density of canal borders and their locations in many edentate mandibles are very often inadequately portrayed by conventional oral radiographic methods. These inadequacies present a strong caveat to the unwary oral implantologist.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ca.980040503
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Palmar-digital arterial networks in fifty pairs of human fetal hands: Arteriographic models for clinical consideration (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 187 (1990), S. 201-210 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Arterial networks in 50 pairs of human fetal hands, made visible by perfusion with radiopaque media, were compared between right and left hands. The imaged primary arterial networks in the fetal hands were also compared with those in adult human and rhesus monkey hands. It was found that superficial arch configurations and their primary ramifications are bilaterally similar in human fetal hands. The configurations of the primary arterial networks are established very early in prenatal growth and may be maintained into adulthood. The similarities in the arterial network arrangements between fetal human and rhesus monkey hands suggest that the rhesus monkey hand could provide and appropriate model for studies of surgical neurovascular anastomosis.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001870209
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    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Microvascular networks in tympanic membrane, malleus periosteum, and annulus perichondrium of neonatal mongrel dog: A vasculoanatomic model for surgical considerations (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 183 (1988), S. 294-302 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: India-ink-imaged blood-vessel networks in cleared tympanic membranes and adnexa from ten neonatal dogs were examined microscopically and photographed. The major significance of the study lies in documentation of a dual source of arterial supply, a bilaminar relationship of arterial and venous plexuses intrinsic to the tympanic membrane, and a consistent major venous pathway relative to a definite locus (pars flaccida of the membrane). Illustration of all three types of blood pathways (arteries, veins, and capillaries) provides new vasculoanatomic data that are essential to ear surgery, specifically - to myringotomies and myringoplasties. A comparison was made between dog and human tympanic membrane structures and their arterial supplies. Close similarities suggested that dog tympanic membrane might serve as a suitable model for development of innovative surgical procedures and as a model for rehearsal of difficult techniques. The results of this investigation provide a valuable caveat to otologists.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001830403
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    Paper (German National Licenses)
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  • 9
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    Critical zone structure controls concentration-discharge relationships and solute generation in forested tropical montane watersheds (2017)
    Wiley-Blackwell
    Details
    Publication Date: 2017-07-14
    Description: Concentration-discharge (C-Q) relationships are poorly known for tropical watersheds, even though the tropics contribute a disproportionate amount of solutes to the global ocean. The Luquillo Mountains in Puerto Rico offer an ideal environment to examine C-Q relationships across a heterogeneous tropical landscape. We use 10-30 years of weekly stream chemistry data across ten watersheds to examine C-Q relationships for weathering products (SiO 2 (aq), Ca 2+ , Mg 2+ , Na + ) and biologically-controlled solutes (dissolved organic carbon [DOC], dissolved organic nitrogen [DON], NH 4 + , NO 3 - , PO 4 3- , K + , SO 4 2- ). We analyze C-Q relationships using power-law equations and a solute production model, and use Principal Component Analysis to test hypotheses regarding how the structure of the Critical Zone controls solute generation. Volcaniclastic watersheds had higher concentrations of weathering solutes and smaller tributaries were approximately 3-fold more efficient at generating these solutes than larger rivers. Lithology and vegetation explained a significant amount of variation in the theoretical maximum concentrations of weathering solutes ( r 2 = 0.43 - 0.48) and in the C-Q relationships of PO 4 3- ( r 2 = 0.63) and SiO 2 (aq) ( r 2 = 0.47). However, the direction and magnitude of these relationships varied. Across watersheds various forms of N and P displayed variable C-Q relationships, while DOC was consistently enriched with increasing discharge. Results suggest that PO 4 3- may be a useful indicator of watershed function. Relationships between C-Q and landscape characteristics indicate the extent to which the structure and function of the critical zone controls watershed solute fluxes.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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    PAPER CURRENT
  • 10
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    Silicon isotope ratios of ODP Site 177-1089 and sediment core E33-22 (2010)
    PANGAEA
    In:  Supplement to: Ellwood, Michael J; Wille, Martin; Maher, William (2010): Glacial silicic acid concentrations in the Southern Ocean. Science, 330(6007), 1088-1091, https://doi.org/10.1126/science.1194614
    Details
    Publication Date: 2024-02-08
    Description: Reconstruction of nutrient concentrations in the deep Southern Ocean has produced conflicting results. The cadmium/calcium (Cd/Ca) data set suggests little change in nutrient concentrations during the last glacial period, whereas the carbon isotope data set suggests that nutrient concentrations were higher. We determined the silicon isotope composition of sponge spicules from the Atlantic and Pacific sectors of the Southern Ocean and found higher silicic acid concentrations in the Pacific sector during the last glacial period. We propose that this increase results from changes in the stoichiometric uptake of silicic acid relative to nitrate and phosphate by diatoms, thus facilitating a redistribution of nutrients across the Pacific and Southern Oceans. Our results are consistent with the global Cd/Ca data set and support the silicic acid leakage hypothesis.
    Keywords: 177-1089; COMPCORE; Composite Core; DRILL; Drilling/drill rig; E33-22; Joides Resolution; Leg177; Ocean Drilling Program; ODP; South Atlantic Ocean; South Pacific
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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