GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Springer  (82)
  • Blackwell Science Ltd  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Clinical & experimental allergy 32 (2002), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Single exposures to 〉 200 p.p.b. of ozone are capable of enhancing the early-phase lung function response to allergen.Objective The aim of the present study was to compare the effect of single vs. repeated exposures to ozone on early and late-phase allergen responses.Methods Eleven subjects with allergic asthma and 22 subjects with allergic rhinitis underwent single exposures to filtered air, 125 p.p.b. and 250 p.p.b. ozone, as well as repeated exposures to 125 p.p.b. ozone on four consecutive days. Twenty hours after the (final) exposure, subjects inhaled a single dose of allergen and a sputum induction was performed 6–7 h later.Results In the subjects with rhinitis, the mean early-phase response of FEV1 and the number of ≥ 20% reductions were significantly greater after exposure to 250 or 4 × 125 p.p.b. ozone compared with filtered air. In addition, most of the ≥ 15% late-phase responses in FEV1 occurred after exposure to 4 × 125 p.p.b., as well as the strongest effects on sputum parameters. The rise in the number of eosinophils was statistically significant in both groups. Regarding the number of lymphocytes and the concentrations of mast cell tryptase, histamine or LDH, significance was, however, only reached in the asthma group.Conclusion Our data suggest that repeated exposure to ozone, at a peak ambient air level, can enhance both functional and inflammatory responses to inhaled allergen in subjects with pre-existing allergic airway diseases, and that these effects might reach a clinically relevant magnitude.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Clinical & experimental allergy 33 (2003), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  Studies investigating the effect of exposure to indoor allergens and endotoxin on human respiratory health usually take dust samples only at one single point of time and consider them to be representative for the indoor biocontaminant burden during a time period of several years. This singly measured biocontaminant concentration is related to adverse respiratory outcomes such as asthma, wheeze or others.Objective  We analysed two repeated measurements of mite and cat allergens in mattress and living room floor dust as well as endotoxin concentrations in living room floor dust. The repeated samples were taken over a time period of about 6 years. We investigated the repeatability over time of their concentrations by determining correlation coefficients and computing within- and between-home variance components.Methods  Our analysis was based on the population of a study on Indoor Factors and Genetics in Asthma (INGA) being carried out in 1995/96 and followed up in 2000/01. Complete data were available from 152 participants.Results  The measured allergen concentrations were low and a considerable percentage of the values was below the limit of detection. The crude Spearman's rank correlation coefficients between the two measurements taken in 1995/96 and 2000/01 ranged from 0.32 to 0.61 for the dust mites allergens, from 0.21 to 0.44 for cat allergen and from 0.35 to 0.51 for endotoxin. Correlations were higher if measurements were performed on the same floor or the same mattress at both sampling time-points. The within-home variance for all measured biocontaminant concentrations was of about the same order as the between-home variance.Conclusion  For studies like ours with low allergen and endotoxin concentrations, the repeatability of these concentrations over a time period as long as 6 years is low and a single measurement does not accurately reflect the true long-term exposure in the homes.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 53 (2004), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The evaluation of host-plant susceptibility to Erwinia amylovora and of colonization of host-plant tissue by individual strains was facilitated by labelling the pathogen with green fluorescent protein (GFP). Colonization of apple leaves assayed with a fluorescence microscope was associated with visual disease ratings on plants to describe virulence (= aggressiveness) of the fireblight pathogen. Resistance induced with 2,6-dichloro-isonicotinic acid (INA) and benzo(1,2,3-) thiadiazol-7-carbothioic acid-S-methyl ester (BTH, the active component of BION™) restricted colonization by the pathogen to an area adjacent to the inoculation site. Migration in leaves was associated with symptom formation on pear slices and host plants of mutant strains. Non-virulent E. amylovora mutants did not migrate into the leaf veins and strains with intermediate-to-low virulence moved slowly. To compare the migration efficiency of individual wild-type strains in apple and plum cultivars, a blend of five wild-type E. amylovora strains with specific numbers of short-sequence DNA repeats (SSRs) in the common plasmid pEA29 was applied to distinguish them by PCR. Fast-moving strains identified in the GFP assays were dominant, independent of the apple cultivar. When apple shoots, pear slices or leaves of apple plants were coinoculated with streptomycin (Sm)-resistant strains and the corresponding parent strains, Sm-resistant mutants were able to dominate the wild-type strain for tissue colonization.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1436-6215
    Keywords: Fatty liver ; isomeric octadecenoic acids ; oleic acid ; petroselinic acid ; coriander oil ; Fettleber ; Isomere Octadecensäuren ; Ölsäure ; Petroselinsäure ; Korianderöl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung In verschiedenen Studien wird eine günstige Wirkung von Pflanzenölen mit hohem Anteil an einfach ungesättigten Fettsäuren, z.B. Ölsäure (cis-9-Octadecensäure), auf die Gesundheit beschrieben. Kürzlich haben wir gezeigt, daß die Fütterung von Ratten mit Korianderöl, das hohe Anteile eines Positionsisomers der Ölsäure enthält, nämlich Petroselinsäure (cis-6-Octadecensäure), zu einer signifikanten Erniedrigung der Arachidonsäure (allcis-5,8,11,14-Eicosatetraensäure)-Anteile in den zellulären Lipiden führte. Hier berichten wir über histopathologische Befunde an männlichen Wistar-Ratten, denen isokalorische Diäten mit 2 % Maiskeimöl und jeweils 12 % (w/w) Pflanzenöl (ölsäure-reiches oder konventionelles Sonnenblumenöl, Olivenöl, Rapsöl, Korianderöl) und unterschiedlichen Anteilen an isomeren Monoenfettsäuren, d.h. Öl- und Petroselinsäure, verabreicht wurden. Die Tiere der Kontrollgruppe erhielten eine Standarddiät mit 4 % (w/w) Fett. Leber, Herz, Aorta, Magen und Milz wurden anatomisch und histologisch untersucht. Die Lebern der Tiere aller Gruppen, die eine fettreiche Diät erhalten hatten — mit Ausnahme der Korianderöl-Gruppe —, entwickelten eine mäßige, nicht-degenerative Fettinfiltration der Hepatocyten, die in den Periportalfeldern einsetzte. Eine ausgeprägte bis schwere Fettinfiltration wurde dagegen in den Hepatocyten von Tieren gefunden, die mit petroselinsäurereichem Korianderöl gefüttert worden waren. In dieser experimentellen Gruppe enthielten die Lebern Fettzysten und Lipidvesikel unterschiedlicher Größe. Außerdem wurden vergrößerte Kerne in zahlreichen Hepatocyten beobachtet, die keine Fettinfiltration aufwiesen. In Ratten, die mit einer Standarddiät gefüttert worden waren, wurde dagegen keine Fettinfiltration in den Leberzellen gefunden. Die Zellen aller anderen untersuchten Organe und Gewebe, insbesondere Herz und Aorta, zeigten weder nicht-degenerative Fettinfiltrationen noch irgendwelche anderen degenerativen Veränderungen. Unsere Ergebnisse zeigen, daß die Fütterung fettreicher Diäten mit unterschiedlichen C18 cis-Monoenfettsäuren in Abhängigkeit von der Position der Doppelbindung unterschiedliche histopathologische Veränderungen in der Leber von Ratten hervorruft. Während Pflanzenöle mit variierenden Ölsäureanteilen ausschließlich zu mäßigen Fettinfiltrationen in den Hepatocyten führten, wurden in den Lebern der mit petroselinsäurereichem Korianderöl gefütterten Tiere degenerative Veränderungen (Fettzysten) sowie — in einigen Fällen — vergrößerte Zellkerne beobachtet, die auf eine unspezifische Stimulierung der Hepatocyten hindeuten.
    Notes: Summary Beneficial effects on health parameters by ingestion of plant oils having high levels of monounsaturated fatty acids such as oleic (cis-9-octadecenoic) acid have been described in several studies. Recently, we have shown that feeding of coriander oil containing high proportions of a positional isomer of oleic acid, i.e. petroselinic (cis-6-octadecenoic) acid, led to significantly decreasing proportions of arachidonic (allcis-5,8,11,14-eicosatetraenoic) acid in the cellular lipids. Here, we report histopathological findings in male Wistar rats fed isocaloric diets containing 2 % corn oil and 12 % (w/w), each, of different plant oils (high-oleic and conventional sunflower oil, olive oil, rapeseed oil as well as coriander oil) containing varying levels of monounsaturated fatty acids, i.e. oleic or petroselinic acids. One group of animals was fed a standard diet containing 4 % (w/w) of fat as control. Liver, heart, aorta, stomach, and spleen were anatomically and histologically examined. Livers of animals from all the groups that had received high-fat diets — except the coriander oil group — showed moderate non-degenerative fat infiltrations of the hepatocytes beginning in the periportal fields. Marked to severe fat infiltration was observed in hepatocytes of animals fed coriander oil. In this experimental group the livers were found to contain fatty cysts in addition to hepatocytes with mixed-size lipid vesicles. Moreover, enlarged nuclei were observed in numerous hepatocytes without fat infiltration. Fat infiltration was not observed in livers of animals fed a rat standard diet. In the cells of all other organs and tissues studied, in particular heart and aorta, neither non-degenerative fat infiltrations nor other degenerative changes were observed for any group. Our results show that feeding of fat-rich diets containing varying proportions of C18 cis-monoenoic fatty acids induced different histopathological alterations in the livers of rats, depending on position of the double bond. Plant oils containing varying proportions of oleic acid lead exclusively to moderate fat infiltration in the hepatocytes, whereas in the animals fed high-petroselinic coriander oil degenerative alterations (fatty cysts) as well as — in several cases — enlarged nuclei were found that are likely due to a non-specific stimulation of the hepatocytes resulting from the cell degeneration observed.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 14 (1992), S. 200-200 
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 25 (1973), S. 453-460 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Betrachtet werden Wellenmessungen mit Schwimmergeräten an Meßpfählen vor den deutschen Küsten. Die nach Beobachtungsstellen und in Klassen annähernd einheitlicher Windrichtung und -stärke geordneten Wellengrößen unterliegen einer sehr starken Streuung. Dies wird an Beispielen gezeigt, wobei Gründe angegeben werden. 2. Mittelwerte pro „Windklasse“ streuen gleichfalls, weil die Zahl der Beobachtungen pro Klasse in den meisten Fällen zu gering ist. 3. Kritisiert wird eine vonGienapp (1972) verwendete Methode; mit ihr wurden für Windklassen, für die keine Wellenbeobachtungen vorliegen, Wellengrößen durch Ausgleichung und Extrapolation abgeleitet. 4. Schließlich wird vorgeschlagen, nur Messungen bei ausgewählten Wetterlagen auszuwerten bzw. in Zukunft nur bei bestimmten, ausgewählten Windsituationen zu messen.
    Notes: Abstract Wave data, obtained by measurements off the coast of the Federal Republic of Germany scatter very strongly, even within “classes” of uniform wind conditions present at measuring time. The reasons for the considerable scatter are enumerated and discussed. The method used byGienapp (1972) for deriving wave properties from strong winds by extrapolation is criticized. It is proposed to conduct wave measurements only during selected, defined weather situations.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 27 (1975), S. 510-510 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 3 (1998), S. 387-396 
    ISSN: 1434-6036
    Keywords: PACS. 73.23.Ad Ballistic transport - 03.65.Sq Semiclassical theories and applications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the influence of a tunnel barrier on the quantum transport through a circular cavity. Our analysis in terms of classical trajectories shows that the semiclassical approaches developed for ballistic transport can be adapted to deal with the case where tunneling is present. Peaks in the Fourier transform of the energy-dependent transmission and reflection spectra exhibit a nonmonotonic behaviour as a function of the barrier height in the quantum mechanical numerical calculations. Semiclassical analysis provides a simple qualitative explanation of this behaviour, as well as a quantitative agreement with the exact calculations. The experimental relevance of the classical trajectories in mesoscopic and microwave systems is discussed.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 275 (1975), S. 209-214 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on experimental electronic stopping cross sections of elements and compounds for Li ions. They are measured with the Inverted Doppler Shift Attenuation (IDSA) method with an accuracy of the order of 1%. In cases where comparable data from other authors exist, agreement within the limits of error is obtained. Systematic and pronounced deviations up to about 30% from Lindhard's theory are found. It turns out that Bragg's rule is generally not valid for stopping cross sections in the velocity range 1.5 · 108 cm/sec to 4.8 · 108 cm/sec.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 180 (1964), S. 489-515 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The oscilloscopic study of avalanches of high carrier numbersn allows to investigate the influence of the space charge on the carrier amplification aboven≈106. The investigation was made with ether in the range ofE/p from 60 to 200 V/Torr·cm, withpd-values from 6 to 500 Torr·cm and with gap widths of 0,3; 0,9 and 2,7 cm. Betweenn=106 and 108 the number of carriers increases less than exp (α0 x). The space charge field of the positive ions reduces the ionisation effect of the electrons. By comparing the lowering of α(n)/α0 with the theory one can calculate the diffusion radius of avalanches and thus the mean energy of agitation in ether, which had a nearly constant value of 3 to 4 eV. Aboven≈5·106 to 107 the avalanche diameter increases considerably especially at high pressures. This effect is produced by the electrostatic repulsion of the electrons in the head of the avalanche. If the carrier number reachesn≈108 α(n)/α0 increases. This is apparently due to processes (“Nachstrom”) following the development of an avalanche just after its transit time.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...