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  • 2000-2004  (137)
  • 1955-1959  (16)
  • 1935-1939  (11)
  • 1
    Unbekannt
    Matter and consciousness : a contemporary introduction to the philosophy of mind (2000)
    Cambridge, Mass : MIT Press
    Details
    Schlagwort(e): Artificial intelligence. ; Cognition. ; Consciousness. ; Intellect. ; Neurology. ; Philosophy of mind.
    Seiten: xii, 184 p.
    Ausgabe: Rev. ed., 9th printing
    ISBN: 0-585-31122-6
    URL: http://www.netLibrary.com/urlapi.asp?action=summary&v=1&bookid=48565
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    E-Book (Nationallizenzen)
  • 2
    E-Ressource
    E-Ressource
    Interactive knee (2003)
    London :Primal Pictures,
    Details
    Titel: Interactive knee
    Beteiligte Person(en): Aichroth, Paul M.
    Ausgabe: Version 1.1
    Verlag: London :Primal Pictures,
    Erscheinungsjahr: 2003
    Seiten: 1 CD-ROM 12 cm
    Serie: Primal 3D interactive series
    Materialart: Elektronische Ressource
    Sprache: Englisch
    Anmerkung: Systemvoraussetzungen PC: Windows95, 98, 2000 or NT 4.0 Pentium; Min 32 Mb RAM , Systemvoraussetzungen MAC: Mac OS 7.1 or newer; Min 20 Mb RAM; 16 bit colour; 604 processor upwards
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    ZIB Katalog
    Zuse-Institut Berlin get availability status
  • 3
    Digitale Medien
    Digitale Medien
    Production of radioactive ion beams using the in-flight technique (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 380-387 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Reactions with a heavy projectile incident on a light target can be used for the efficient in-flight production of secondary radioactive beams. An overview of this technique is given using data on 17F beams produced via the p(17O, 17F)n and d(16O, 17F)n reactions. With primary 16,17O beam currents of 100 pnA, intensities of up to 2×106 17F/s on target were achieved. Using this beam, the p(17F,α)14O reaction was measured. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150211
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  • 4
    Digitale Medien
    Digitale Medien
    Land-Use History in Ecosystem Restoration: A 40-Year Study in the Prairie-Forest Ecotone (2000)
    Boston, MA, USA : Blackwell Science Inc
    Restoration ecology 8 (2000), S. 0 
    Details
    ISSN: 1526-100X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Land-use history, recent management, and landscape position influence vegetation at the Rockefeller Experimental Tract (RET), a 40-year-old restoration experiment in northeast Kansas. RET is representative of the prairie-forest ecotone, containing native tallgrass prairie and oak-hickory forest, but unique in having tracts of replanted prairie, seeded in 1957, that have undergone long-term restoration treatments: burned, grazed, mowed, or untreated. A land-use history database for RET was compiled using a geographic information system to integrate historic and contemporary sources of information. Restoration management on the reseeded prairie has had a profound effect on forest development: mowing or burning precluded forest establishment (〈3% forest cover), whereas portions of untreated or grazed areas became heavily forested (〉97% forest cover). Forest colonization depends upon biotic and edaphic conditions at the time restoration was initiated: for areas replanted to prairie and managed by grazing, forestation was 6% on land in cultivation prior to replanting, 20% on former pastureland, and 98% on land deforested just before replanting. Patterns of forest colonization were also significantly associated with three landscape positions: near existing forest, along water courses, and along ridge tops. Additionally, land-use history analyses showed that the presence of various prairie and forest species resulted from persistence and not from colonization following restoration. Because of the lasting imprint of historic land use on the landscape, our results indicate that it is essential that restoration studies be evaluated within a site-specific historical context.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1526-100x.2000.80043.x
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  • 5
    Digitale Medien
    Digitale Medien
    Benchmark Dose Risk Assessment for Formaldehyde Using Airflow Modeling and a Single-Compartment, DNA-Protein Cross-Link Dosimetry Model to Estimate Human Equivalent Doses (2003)
    350 Main Street , Malden , MA 02148 , USA , and 9600 Garsington Road , Oxford OX4 2DQ , UK . : Blackwell Publishing Inc.
    Risk analysis 23 (2003), S. 0 
    Details
    ISSN: 1539-6924
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: Formaldehyde induced squamous-cell carcinomas in the nasal passages of F344 rats in two inhalation bioassays at exposure levels of 6 ppm and above. Increases in rates of cell proliferation were measured by T. M. Monticello and colleagues at exposure levels of 0.7 ppm and above in the same tissues from which tumors arose. A risk assessment for formaldehyde was conducted at the CIIT Centers for Health Research, in collaboration with investigators from Toxicological Excellence in Risk Assessment (TERA) and the U.S. Environmental Protection Agency (U.S. EPA) in 1999. Two methods for dose-response assessment were used: a full biologically based modeling approach and a statistically oriented analysis by benchmark dose (BMD) method. This article presents the later approach, the purpose of which is to combine BMD and pharmacokinetic modeling to estimate human cancer risks from formaldehyde exposure. BMD analysis was used to identify points of departure (exposure levels) for low-dose extrapolation in rats for both tumor and the cell proliferation endpoints. The benchmark concentrations for induced cell proliferation were lower than for tumors. These concentrations were extrapolated to humans using two mechanistic models. One model used computational fluid dynamics (CFD) alone to determine rates of delivery of inhaled formaldehyde to the nasal lining. The second model combined the CFD method with a pharmacokinetic model to predict tissue dose with formaldehyde-induced DNA-protein cross-links (DPX) as a dose metric. Both extrapolation methods gave similar results, and the predicted cancer risk in humans at low exposure levels was found to be similar to that from a risk assessment conducted by the U.S. EPA in 1991. Use of the mechanistically based extrapolation models lends greater certainty to these risk estimates than previous approaches and also identifies the uncertainty in the measured dose-response relationship for cell proliferation at low exposure levels, the dose-response relationship for DPX in monkeys, and the choice between linear and nonlinear methods of extrapolation as key remaining sources of uncertainty.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1539-6924.00328
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  • 6
    Digitale Medien
    Digitale Medien
    Propagation of a Long-Lived and Threatened Prairie Plant, Lupinus sulphureus ssp. kincaidii (2003)
    Boston, MA, USA : Blackwell Science Inc
    Restoration ecology 11 (2003), S. 0 
    Details
    ISSN: 1526-100X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Willamette Valley upland prairie in western Oregon, U.S.A. has been severely degraded and fragmented in the past 150 years after European settlement, resulting in vast population reductions of endemic species. Icaricia icarioides fenderi (Fender's blue butterfly) and Lupinus sulphureus ssp. kincaidii (Kincaid's lupine) are federally listed as Endangered and Threatened Species, respectively. Both are Willamette Valley upland prairie endemics, and Kincaid's lupine is the primary host plant for the Fender's blue butterfly. Attempts to grow Kincaid's lupine have been partially successful in a greenhouse situation; however, propagating plants from field-sown seed can be tenuous and plant establishment is unpredictable. Kincaid's lupine seeds were planted in the fall 1997 at two different upland prairie sites, and the cohort was followed through the summer 2000. Based on cohort tables the most vulnerable life stages to mortality are the germinant stage and the first growing year. Mechanical scarification of Kincaid's lupine seeds yielded no significant differences in survivorship, maternal function, plant size, and the percentage of seeds germinated compared with unscarified seeds. Differential seed source performance detected at one planting site suggests that underlying differences in population genetics may affect Kincaid's lupine vigor, fitness, and establishment. Future restoration projects for Kincaid's lupine should focus on upland prairie sites with naturally occurring lupine populations because local ecological conditions are favorable for lupine establishment. Moreover, the addition of new individuals to small Kincaid's lupine colonies will buffer against the effects of inbreeding depression and increase the site carrying capacity for Fender's blue butterfly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1526-100X.2003.00175.x
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  • 7
    Digitale Medien
    Digitale Medien
    Restoration of Hydrastis canadensis: Experimental Test of a Disturbance Hypothesis After Two Growing Seasons (2004)
    Oxford, UK; Malden , USA : Blackwell Science Inc
    Restoration ecology 12 (2004), S. 0 
    Details
    ISSN: 1526-100X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: This paper tests the hypothesis that disturbance simulation is beneficial for restoration of Hydrastis canadensis (goldenseal) 2 years after a disturbance event. This takes into account possible delay in resource allocation to reproduction. At five deciduous woodland sites in Ontario, Canada, three disturbance simulation treatments, fertilization, soil turnover, fertilization + soil turnover, and a control were randomly applied to experimental blocks in 1999. Seeds and mature rhizomes were transplanted into each treatment plot. Seed production and seedlings were recorded in 2001. Transplants were measured and flowers and fruit recorded in 2000 and 2001. Soil turnover and fertilization + soil turnover significantly increased the production of flowers and fruit in the second year after disturbance, contrasting with lack of significance in the first year. The effect on plant size was opposite, with significantly increased cover in the first year but not the second. Soil turnover + fertilization significantly increased seed production. The disturbance treatments did not have a significant effect on number or presence of seedlings possibly due to extraordinary drought conditions. Consideration of second-year results strongly suggests that (1) substrate disturbance, in addition to canopy gaps, is an important factor in woodland herb ecology; (2) certain woodland herbs may be rare due to lack of specific disturbances which were more prevalent in the past; and (3) mature woodlands may require management, involving disturbance simulation, for the protection and restoration of certain rare woodland flora.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1061-2971.2004.00297.x
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  • 8
    Digitale Medien
    Digitale Medien
    Restoration of Hydrastis canadensis by Transplanting with Disturbance Simulation: Results of One Growing Season (2003)
    Boston, MA, USA : Blackwell Science Inc
    Restoration ecology 11 (2003), S. 0 
    Details
    ISSN: 1526-100X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Having evolved in an environment with large, severe, and frequent disturbances, including massive floods, fires, and impacts of extinct and extirpated fauna, woodland herbs may be adapted to such disturbance processes. Present lack of such disturbances may contribute to present rarity. We test the hypothesis that transplanting with disturbance simulation can be used to restore the threatened woodland herb, Hydrastis canadensis (goldenseal). Three disturbance-simulation treatments (soil turnover, fertilization, and both) and a control were randomly applied to 100 blocks in goldenseal habitat, and a single rhizome was transplanted into each treatment. Transplanting was effective with 85% of the transplants surviving, 41% flowering, and 34% fruiting; thus, transplanting may increase area of occupancy. Soil turnover alone and combined with fertilization caused a significant increase in plant size available to support production of fruit. Increased flower and significantly increased fruit production were also characteristic of soil-turned plots. Results support the hypothesis that some woodland herbs are rare due to lack of certain disturbance, call for consideration of soil disturbance as a potentially important and beneficial influence on woodland herbs regardless of light effects, and suggest that transplanting into soil-overturned plots may restore goldenseal. The assumption that undisturbed conditions are optimal may impede effective management of rare woodland flora, highlighting the need for a more flexible approach.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1526-100X.2003.00183.x
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  • 9
    Digitale Medien
    Digitale Medien
    Discoloration of a titanium alloy removable partial denture: A clinical report (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of prosthodontics 10 (2001), S. 0 
    Details
    ISSN: 1532-849X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: With recent advances in dental technology, titanium is currently used for fabrication of crowns, fixed partial dentures, implant frameworks, and removable partial denture frameworks. The use of titanium-aluminum-vanadium (Ti-6Al-4V) alloy assumes that it imparts similar anti-corrosion characteristics to the commercially pure titanium. This clinical report describes a patient who experienced discoloration of a Ti-6Al-4V alloy removable partial denture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1532-849X.2001.00102.x
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  • 10
    Digitale Medien
    Digitale Medien
    Injury-induced ‘switch’ from GTP-regulated to novel GTP-independent isoform of tissue transglutaminase in the rat spinal cord (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 81 (2002), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We recently found that alternative transcripts of tissue transglutaminase (tTG or TG2) were present in hippocampal brain regions of Alzheimer's disease (AD), but not in control, non-demented, age-matched brains. Since antecedent non-severe trauma has been implicated in AD and other neurodegenerative diseases, such as Parkinson's disease (PD) and amyotrophic lateral sclerosis (ALS), we were interested in whether alternative transcripts might be detected in a model of neurotrauma, controlled-contusion spinal cord injury (SCI) in the rat. Implicated in diverse roles from growth and differentiation to apoptotic cell death, only bifunctional tTG, of the nine member TG family, has dual catalytic activities: guanine trinucleotide (GTP) hydrolyzing activity (GTPase), as well as protein cross-linking. These functions imply two physiological functions: programmed cell life and death. These may have profound roles in the nervous system since studies in cultured astrocytes found tTG short (S) mRNA transcripts induced by treatment with injury-related cytokines. In the developing rat spinal cord, tTG activity is concentrated in ventral horn alpha motoneurons, but neither studies of spinal cord tTG gene expression, nor evaluation of the GTP-regulated isoforms in tissues, have been reported. We now report increased tTG protein and gene expression occurring rapidly after SCI. In parallel, novel appearance of a second, short form transcript, in addition to the normal long (L) isoform, occurs by 8 h of injury. Up-regulation of tTG message and activity following neural injury. with appearance of a truncated GTP-unregulated S form, may represent new approaches to drug targets in neurotrauma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1471-4159.2002.00850.x
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