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  • 1
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    (Table 4) Rates of seropositivity for Toxoplasma gondii antibodies in marine mammals by age category
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Biological sample; BIOS; Direct agglutination test kit for IgG antibodies (DAT, Toxo-Screen DA bioMerieux; Sample amount, subset; Sex; Species; Species, common name; Svalbard; Svalbard_bear; Toxoplasma gondii seropositive rate
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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  • 2
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    (Table 1) Rates of seropositivity for Toxoplasma gondii antibodies in polar bears and marine mammals around Svalbard
    PANGAEA
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    Publication Date: 2023-05-12
    Keywords: Biological sample; BIOS; Direct agglutination test kit for IgG antibodies (DAT, Toxo-Screen DA bioMerieux; Sample amount; Sex; Species; Species, common name; Svalbard; Svalbard_bear; Toxoplasma gondii seropositive rate
    Type: Dataset
    Format: text/tab-separated-values, 80 data points
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  • 3
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    (Table 2) Rates of seropositivity for Toxoplasma gondii antibodies in polar bears (Ursus maritimus) by age and geographic area
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, relative, number of years; Biological sample; BIOS; Direct agglutination test kit for IgG antibodies (DAT, Toxo-Screen DA bioMerieux; Sample amount; Sample amount, subset; Sex; Species; Svalbard; Svalbard_bear; Toxoplasma gondii seropositive rate
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
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  • 4
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    Rates of seropositivity for Toxoplasma gondii antibodies in polar bears and marine mammals around Svalbard (2010)
    PANGAEA
    In:  Supplement to: Jensen, S K; Aars, Jon; Lydersen, Christian; Kovacs, Kit Maureen; Åsbakk, K (2009): The prevalence of Toxoplasma gondii in polar bears and their marine mammal prey: evidence for a marine transmission pathway? Polar Biology, 33(5), 599-606, https://doi.org/10.1007/s00300-009-0735-x
    Details
    Publication Date: 2023-12-13
    Description: Little is known about the prevalence of the parasite Toxoplasma gondii in the arctic marine food chain of Svalbard, Norway. In this study, plasma samples were analyzed for T. gondii antibodies using a direct agglutination test. Antibody prevalence was 45.6% among polar bears (Ursus maritimus), 18.7% among ringed seals (Pusa hispida) and 66.7% among adult bearded seals (Erignathus barbatus) from Svalbard, but no sign of antibodies were found in bearded seal pups, harbour seals (Phoca vitulina), white whales (Delphinapterus leucas) or narwhals (Monodon monoceros) from the same area. Prevalence was significantly higher in male polar bears (52.3%) compared with females (39.3%), likely due to dietary differences between the sexes. Compared to an earlier study, T. gondii prevalence in polar bears has doubled in the past decade. Consistently, an earlier study on ringed seals did not detect T. gondii. The high recent prevalence in polar bears, ringed seals and bearded seals could be caused by an increase in the number or survivorship of oocysts being transported via the North Atlantic Current to Svalbard from southern latitudes. Warmer water temperatures have led to influxes of temperate marine invertebrate filter-feeders that could be vectors for oocysts and warmer water is also likely to favour higher survivorship of oocycts. However, a more diverse than normal array of migratory birds in the Archipelago recently, as well as a marked increase in cruise-ship and other human traffic are also potential sources of T. gondii.
    Keywords: Biological sample; BIOS; International Polar Year (2007-2008); IPY; Svalbard; Svalbard_bear
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of Methane Oxidizing Bacteria in Forest Soil by Monooxygenase PCR Amplification (2000)
    Springer
    Microbial ecology 39 (2000), S. 282 -289 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Atmospheric methane oxidation by a spruce forest soil from Norway at 15°C was found to be maximal at a depth of ca 7 cm. Examination of the kinetics of this methane oxidation revealed an apparent K m of 403.1 nM and a V max of 2.2 nmol g-1 dry weight soil h-1. The low apparent K m suggested the presence of active methane oxidizing bacteria with a high affinity for methane. DNA was extracted from the 5–10 cm horizon, purified, and subjected to PCR amplification with primers directed toward the monooxygenase genes pmoA and amoA, which are essential for methane oxidation. Hybridization analysis of the clone library subsequently constructed revealed that 49% of the 76 cloned PCR fragments were putative methanotroph pmoA sequences and 16% were putative ammonium oxidizing nitrifier amoA sequences. Sequencing of 28 clones identified three major groups showing homology to pmoA from Methylococcus capsulatus,β-subdivision ammonia-oxidizers (amoA), and a new group of monooxygenase pmoA/amoA sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002480000013
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  • 6
    Electronic Resource
    Electronic Resource
    Die Carotinoide der Thiorhodaceae (1963)
    Springer
    Archives of microbiology 46 (1963), S. 117-126 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Isolation and properties of a new carotenoid are described. It was found in Chromatium okenii as the only carotenoid in a remarkably high concentration (50 μg/mg protein) and is characterized by the presence of a conjugated keto-group and a tertiary methoxyl-group. We suggest to name the new carotenoid okenone. Phytofluene, ξ-carotene, neurosporene and lycopene were found only in cells grown in the presence of diphenylamine.
    Notes: Zusammenfassung Es werden Isolierung und Eigenschaften eines neuen Carotinoids beschrieben. Es liegt in Chromatium okenii als einziges Carotinoid vor, ist in relativ sehr hoher Konzentration (50 μg/mg Protein) enthalten und durch eine konjugierte Ketogruppe und eine tertiäre Methoxylgruppe charakterisiert. Es wird der Name “Okenon” vorgeschlagen. Phytofluen, ξ-Carotin, Neurosporin und Lycopin wurden als Begleitcarotinoide lediglich in Zellen nachgewiesen, die in Gegenwart von Diphenylamin gewachsen waren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408204
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  • 7
    Electronic Resource
    Electronic Resource
    Carotenoids of thiorhodaceae (1965)
    Springer
    Archives of microbiology 52 (1965), S. 132-146 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Carotinoid-Zusammensetzung von 25 Thiorhodaceae-Stämmen wurde untersucht. Aus chemischen und biochemischen Gründen können die 17 aufgefundenen Carotinoide in die Spirilloxanthin-, Okenon- und Warmingon-Reihen zusammengefaßt werden. Die meisten der untersuchten Stämme bilden Carotinoide, die nur zu einer dieser Gruppen gehören, von denen die sogenannte normale Spirilloxanthin-Reihe am häufigsten vorkommt. Das Verteilungsmuster der Carotinoide bei phototrophen Bakterien wird kurz dargestellt und der Wert der Carotinoid-Zusammensetzung für die Taxonomie der Schwefel-Purpurbakterien diskutiert.
    Notes: Summary The carotenoid composition of 25 pure isolates of Thiorhodaceae has been studied. The 17 carotenoids encountered can, on the basis of chemical and biochemical considerations, be grouped into the spirilloxanthin, okenone and warmingone series. Most of the isolates examined synthesize carotenoids belonging to one of these groups only—the so-called normal spirilloxanthin series being the most common. The distribution pattern of carotenoids in phototrophic bacteria in general is briefly discussed, and the implications of the carotenoid composition in the taxonomy of the sulphur purple bacteria are evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407723
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  • 8
    Electronic Resource
    Electronic Resource
    Die Carotinoide der Thiorhodaceae (1963)
    Springer
    Archives of microbiology 46 (1963), S. 138-149 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Besides lycopene and rhodopin, Chromatium warmingii contains three new carotenoids, not previously described. One (Pigment 3) with a lycopene chromophore, is presumably a hydroxy-derivative of rhodopin (1,2-dihydro-1-OH-lycopene); the second hydroxyl group is secondary. The two other pigments are keto-carotenoids with a common chromophoric system. The main carotenoid, which accounted for 73% of the total carotenoid content of this organism, has been named warmingone (Pigment 2). Warmingone afforded Pigment 3 on LiAlH4-reduction. A close chemical relationship between the carotenoids present has been established, which in turn suggests their biosynthetic interrelationship.
    Notes: Zusammenfassung Chromatium warmingii enthält außer Lycopin und Rhodopin drei weitere bisher nicht beschriebene Carotinoide. Das eine (Pigment 3) mit Lycopin-Chromophor ist wahrscheinlich ein Hydroxy-Derivat von Rhodopin (1,2-Dihydro-1-OH-Lycopin); die zweite Hydroxylgruppe ist sekundär. Die sehr ähnlichen Spektren der beiden anderen gehören zu dem verschwommenen Typus der Keto-Carotinoide. Das Hauptcarotinoid, das zu 73% der Gesamtcarotinoide enthalten war, wurde Warmingon (Pigment 2) genannt. Warmingon, liefert bei LiAlH4-Reduktion Pigment 3. Die für die vorhandenen Carotinoide nachgewiesenen engen chemischen Beziehungen deuten auf ihre biosynthetische Verwandtchaft hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408206
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  • 9
    Electronic Resource
    Electronic Resource
    A new isolate of the rhodospirillum fulvum group and its photosynthetic pigments (1965)
    Springer
    Archives of microbiology 51 (1965), S. 258-266 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Es wird die Isolierung eines obligat phototrophen Bakteriums beschrieben, welches auf Grund seiner Farbe, Morphologie, Nährstoff-Bedürfnisse und streng anaeroben Lebensweise in die Rhodospirillum fulvum-Gruppe eingeordnet wird. Als einzigen Wachstumsfaktor benötigt der Stamm p-Aminobenzoesäure. Rhsp. fulvum bildet Bacteriochlorophyll a als einzigen chlorophyllartigen Farbstoff. Die Hauptmenge der Carotinoide besteht aus Lycopin (I) und Rhodopin (II); es sind außerdem Spuren von 1,2,1′2′-Tetrahydro-1,1′-dihydroxy-Lycopin (III) nachgewiesen.
    Notes: Summary The present paper reports the isolation of an obligate phototrophic bacterium which belongs to the Rhodospirillum fulvum-group on the basis of its colour, morphology, nutritional requirements and strictly anaerobic nature. p-Aminobenzoic acid was shown to be the only growth factor required. Rhsp. fulvum synthesizes bacteriochlorophyll a as its only chlorophyllous pigments. The carotenoid composition comprises lycopene (I) and rhodopin (II) as the major components; traces of 1,2,1′,2′-tetrahydro-1,1′-dihydroxy-lycopene (III) were also present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408142
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of fluoride, calcium, and phosphate administration on mineralization in rats (1980)
    Springer
    Calcified tissue international 31 (1980), S. 225-230 
    Details
    ISSN: 1432-0827
    Keywords: Fluoride metabolism ; Calcium metabolism ; Mineralization ; Dentin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Seven days before a fluoride injection of 20 mg sodium fluoride per kg body weight, 3-month-old rats grown on a standard pellet diet containing 0.8% calcium and 1.4% phosphate were given a diet of rice with only 0.025% calcium and 0.1% phosphate. Microradiographs of the continuously growing incisors showed a hypermineralized and a subsequent hypomineralized zone. Blood analysis demonstrated a decrease and a subsequent reestablishment of plasma calcium concentration. In some experiments calcium and phosphate were administered to compensate the hypocalcemia which prevented the hypomineralized zone from arising. A delay of calcium and phosphate administration led to formation of a mineralized band within the hypomineralized zone. The results are discussed with reference to calcium homeostasis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407185
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