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  • 1
    Publication Date: 2017-02-20
    Description: Dramatic global amphibian declines have recently led to an increased concern for many species of this animal class. The enigmatic Hula painted frog (Latonia nigriventer), the first amphibian to be declared extinct but unexpectedly rediscovered in 2011, has remained one of the rarest and most poorly understood amphibians worldwide. Gathering basic biological information on this species, along with an understanding of its disease-related threats remains fundamental for developing risk assessments and conservation strategies. Our surveys in recent years confirmed that L. nigriventer is a localised species with elusive habits. The species appears to follow an opportunistic breeding phenology and has a tadpole morphology similar to its well-studied sister group Discoglossus. However, the adults’ extended annual presence in the aquatic habitat is a major difference from species of Discoglossus. We detected the amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd), in northern Israel and on Hula painted frogs but did not observe any signs of chytridiomycosis in this species. Our preliminary data on aspects of the innate immunity of L. nigriventer suggest that the skin mucosome of this species contains antimicrobial peptides and a bacterial community differing from other syntopic frogs (Pelophylax bedriagae). The combined knowledge of both natural history and innate immunity of L. nigriventer provides valuable insights to direct future research and conservation management of this critically endangered frog species.
    Keywords: Amphibia ; antimicrobial peptides ; Anura ; Batrachochytrium dendrobatidis ; habitat ; skin microbiota ; tadpole
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 2
    Publication Date: 2024-01-12
    Description: Dramatic global amphibian declines have recently led to an increased concern for many species of this animal class. The enigmatic Hula painted frog (Latonia nigriventer), the first amphibian to be declared extinct but unexpectedly rediscovered in 2011, has remained one of the rarest and most poorly understood amphibians worldwide. Gathering basic biological information on this species, along with an understanding of its disease-related threats remains fundamental for developing risk assessments and conservation strategies. Our surveys in recent years confirmed that L. nigriventer is a localised species with elusive habits. The species appears to follow an opportunistic breeding phenology and has a tadpole morphology similar to its well-studied sister group Discoglossus. However, the adults\xe2\x80\x99 extended annual presence in the aquatic habitat is a major difference from species of Discoglossus. We detected the amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd), in northern Israel and on Hula painted frogs but did not observe any signs of chytridiomycosis in this species. Our preliminary data on aspects of the innate immunity of L. nigriventer suggest that the skin mucosome of this species contains antimicrobial peptides and a bacterial community differing from other syntopic frogs (Pelophylax bedriagae). The combined knowledge of both natural history and innate immunity of L. nigriventer provides valuable insights to direct future research and conservation management of this critically endangered frog species.
    Keywords: Amphibia ; antimicrobial peptides ; Anura ; Batrachochytrium dendrobatidis ; habitat ; skin microbiota ; tadpole
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Format: application/msword
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 36-38 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Für den Hauptanteil des Mono-bromierungsproduktes des Diallyls mit Bromsuccinimid wird die Konstitution des 3-Bromhexadiens-(1, 4) durch Ozonabbau bewiesen.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0947-3440
    Keywords: 4H-Pyrazoles ; [4 + 2] Cycloaddition with reversed electron demand ; [m]Diaza[n]norbornenes ; High-pressure reactions ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bifunctional 9, 3, 17, and trifunctional 20 dienophiles have been subjected to Diels-Alder reactions with 4H-pyrazoles 8 or 14 with inverse electron demand to form monoadducts 13, 15, 18, and 21 and bisadducts 16, 19, and 26. Acid-catalyzed reactions at 20°C occur according to 14 + 3 → 15 + 16 and 14 + 17 → 18 + 19. By contrast, the solution of barrelene (20) and 8 has to be subjected to 10 kbar and 130°C to give monoadduct 21 and bisadduct 26, In daylight 21 undergoes [2 + 2] cycloaddition to 27. The norbornene derivative 10 reacts with cyclopentadiene to form 13 which is obtained in higher yield by reaction of 10 with hexachlorocyclopenta-diene and subsequent reductive dehalogenation of adduct 12. X-ray analyses of 11 and 13 reveal only small differences in the structural parameters.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 32 (1949), S. 1013-1015 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der bisher unbekannte Muconsäure-dialdehyd und das bisher unbekannt gewesene Octadien-(3,5)-dion-(2,7) werden beschrieben und für die erstere der beiden Verbindungen ein einfaches Darstellungsverfahren angegeben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus γ-[Naphthyl-(2)]-buttersäureäthylester (5) wird durch Friedel-Crafts-Acetylierung, Reformatzky-Reaktion, Dehydratisierung, katalytische Reduktion und Hydrolyse 6-[γ-Carboxy-propyl]-2-[1-carboxy-isopropyl]-naphthalin (2) dargestellt, welches als Schlüsselsubstanz für eine neue Synthese des Diels-Kohlenwasserstoffs (15) dient.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2019-08-28
    Description: Future versions of data relay satellite systems are currently being planned by NASA. Being given consideration for implementation are on-board digital beamforming techniques which will allow multiple users to simultaneously access a single S-band phased array antenna system. To investigate the potential performance of such a system, a laboratory simulator has been developed at NASA's Lewis Research Center. This paper describes the system simulator, and in particular, the requirements, design and performance of a key subsystem, the phased array antenna simulator, which provides realistic inputs to the digital processor including multiple signals, noise, and nonlinearities.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Journal of Satellite Communications (ISSN 0737-2884); 10; 5; p. 293-297.
    Format: text
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  • 8
    Publication Date: 2019-07-13
    Description: Future versions of data relay satellite systems are currently being planned by NASA. Being given consideration for implementation are on-board digital beamforming techniques which will allow multiple users to simultaneously access a single S-band phased array antenna system. To investigate the potential performance of such a system, a laboratory simulator has been developed at NASA's Lewis Research Center. This paper describes the system simulator, and in particular, the requirements, design, and performance of a key subsystem, the phased array antenna simulator, which provides realistic inputs to the digital processor including multiple signals, noise, and nonlinearities.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-105422 , E-6838 , NAS 1.15:105422 , International Conference on Digital Satellite Communications; May 18, 1992 - May 22, 1992; Copenhagen; Denmark
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