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  • 1
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1984(32)
    Language: Undetermined
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  • 2
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1982(47)
    Language: Undetermined
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  • 3
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1978(27)
    Language: Undetermined
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2864-2866 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report experimental, room temperature data showing real space transfer in a heterostructure which can support the movement of electrons over a barrier in both directions between two channels. Real space transfer occurs between two channels connected in parallel in a three-gate transistor, which has been developed to interrogate the channel populations. Results are presented that demonstrate real space transfer in a heterostructure which features a 2.5:1 mobility ratio between channels. This heterostructure is designed for use in a velocity modulation transistor, which requires reciprocal, gate-assisted transfer between two channels of differing mobilities. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-8469
    Keywords: Ammonia ; Nitrapyrine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Toevoeging van 0.1% ureum of 0.1% NH4Cl verminderde de populatie vanF. oxysporum f. sp.dianthi in een van de twee getoetste gronden. Ammoniak lijkt niet verantwoordelijk voor deze afname, aangezien ammoniak in beide gronden gelijkelijk ontwikkelde na toevoeging van ureum of NH4Cl. Toevoeging van Nitrapyrine tesamen met ureum of NH4Cl aan de ‘actieve’ grond verhoogde de concentratie ammoniak in de grond, maar verlaagde het remmend effect. Toevoeging van nitraat in hoeveelheden die overeenkoment met die welke gemeten worden na volledige omzetting van ureum had geen effect op de populatie vanF. oxysporum f. sp.dianthi. Toevoeging van nitriet in hoeveelheden die overeenkomen met die welke gemeten worden na volledige afbraak van ureum verminderde de populatie wel. In vitro remde nitriet de chlamydosporevorming vanF. oxysporum f. sp.dianthi. Toediening van 0.1% ureum aan de grond gaf een 10 tot 100 maal hogere nitrietaccumulatie in de ‘actieve’ gron dan in de ‘niet-actieve’ grond. Daarom wordt de conclusie getrokken, dat nitriet veeleer dan ammoniak verantwoordelijk is voor de vermindering van de populatie vanF. oxysporum f. sp.dianthi in grond waaraan ammoniak-genererende verbindingen zijn toegevoegd.
    Notes: Abstract Addition of 1 g urea or NH4Cl per kg dry soil (0.1%) reduced the population ofFusarium oxysporum f. sp.dianthi in one of two soils tested. Ammonia does not seem to be the responsible factor since it accumulated similarly in both soils upon addition of NH4Cl or urea. Addition of Nitrapyrine in combination with 0.1% urea or NH4Cl increased ammonia concentrations in soil but decreased the population-declining effect. Addition of nitrate in amounts corresponding to those measured after decomposition of urea in soil had no effect on population development. Addition of nitrite in amounts corresponding to those measured during decomposition of urea in soil decreased the population ofF. oxysporum f. sp.dianthi. In vitro, nitrite inhibited chlamydospore formation. Upon addition of 0.1% urea, nitrite accumulated 10 to 100 times more in the susceptible soil than in the not-susceptible soil. It is concluded that nitrite rather then ammonia is responsible for the decline effect of ammonia-generating compounds on populations ofF. oxysporum f. sp.dianthi in soil.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2015-11-14
    Description: Migratory birds have the potential to transport exotic vectors and pathogens of human and animal health importance across vast distances. We systematically examined birds that recently migrated to the United States from the Neotropics for ticks. We screened both ticks and birds for tick-borne pathogens, including Rickettsia species and Borrelia burgdorferi . Over two spring seasons (2013 and 2014), 3.56% of birds ( n = 3,844) representing 42.35% of the species examined ( n = 85) were infested by ticks. Ground-foraging birds with reduced fuel stores were most commonly infested. Eight tick species were identified, including seven in the genus Amblyomma , of which only Amblyomma maculatum/Amblyomma triste is known to be established in the United States. Most ticks on birds (67%) were neotropical species with ranges in Central and South America. Additionally, a single Ixodes genus tick was detected. A total of 29% of the ticks ( n = 137) and no avian blood samples ( n = 100) were positive for infection with Rickettsia species, including Rickettsia parkeri , an emerging cause of spotted fever in humans in the southern United States, a species in the group of Rickettsia monacensis , and uncharacterized species and endosymbionts of unknown pathogenicity. No avian tick or blood samples tested positive for B. burgdorferi , the etiologic agent of Lyme disease. An extrapolation of our findings suggests that anywhere from 4 to 39 million exotic neotropical ticks are transported to the United States annually on migratory songbirds, with uncertain consequences for human and animal health if the current barriers to their establishment and spread are overcome.
    Print ISSN: 0099-2240
    Electronic ISSN: 1098-5336
    Topics: Biology
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  • 7
    Publication Date: 2011-03-01
    Description: In situ secondary ion mass spectrometry (SIMS) analyses of δ7Li, Li/Ca, and Mg/Ca were performed on five synthetic aragonite samples precipitated from seawater at 25°C at different rates. The compositions of δ7Li in bulk aragonites and experimental fluids were measured by multicollector inductively coupled plasma–mass spectrometry (MC-ICP-MS). Both techniques yielded similar δ7Li in aragonite when SIMS analyses were corrected to calcium carbonate reference materials. Fractionation factors α7Li/6Li range from 0.9895 to 0.9923, which translates to a fractionation between aragonite and fluid from −10.5‰ to −7.7‰. The within-sample δ7Li range determined by SIMS is up to 27‰, exceeding the difference between bulk δ7Li analyses of different aragonite precipitates. Moreover, the centers of aragonite hemispherical bundles (spherulites) are enriched in Li/Ca and Mg/Ca relative to spherulite fibers by up to factors of 2 and 8, respectively. The Li/Ca and Mg/Ca ratios of spherulite fibers increase with aragonite precipitation rate. These results suggest that precipitation rate is a potentially important consideration when using Li isotopes and elemental ratios in natural carbonates as a proxy for seawater composition and temperature.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
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