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  • Chemistry  (23,861)
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  • 42.75
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  • 2010-2014  (90)
  • 1965-1969  (25,696)
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  • 1
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.5
    Publication Date: 2017-03-16
    Description: Tweestaarten Diplura behoren met de springstaarten Collembola en beentasters Protura tot de Entognatha. Dat zijn kleine ongevleugelde bodemdieren met zes poten, die zich onderscheiden van de insecten door hun verzonken monddelen. Tot nu toe waren twee soorten voor Nederland gemeld, maar voor België 13. Tijdens een onderzoek naar in mierennesten levende organismen werden twee soorten gevonden die nog niet uit Nederland bekend waren. Verder onderzoek zal zeker nog meer nieuwe tweestaarten kunnen opleveren.
    Keywords: Diplura ; Nederland ; Campodea lubbocki ; Campodea plusiochaeta ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 2
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.67
    Publication Date: 2017-03-16
    Description: Larven van kriebelmuggen komen uitsluitend voor in stromend water, waar ze met hun waaiervormige monddelen deeltjes filteren uit het voorbij stromende water. Het zijn goede indicatoren voor zuurstofrijk water. Tot nu toe was niet duidelijk welke soorten precies voorkomen in Nederland en België en de determinatie van kriebelmuggen wordt vaak als lastig beschouwd. Om dit te verhelpen, presenteren we hier determinatietabellen voor alle in Nederland en België voorkomende soorten, zowel voor larven van het laatste stadium als voor poppen.
    Keywords: Diptera ; Simuliidae ; Nederland ; België ; herkenning ; verspreiding ; ecologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 3
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.17
    Publication Date: 2017-03-16
    Description: De catalogus van de Nederlandse kevers uit 2010 geeft het meest recente overzicht van de Nederlandse kevers. Er staan 372 soorten loopkevers op deze lijst. Per soort wordt een overzicht gegeven van de provincies waaruit waarnemingen bekend zijn. Voor elk zogenaamd provincierecord is een collectie-exemplaar aangeduid als bewijsexemplaar. Sinds 2010 is er veel nieuwe informatie over loopkevers bekend geworden. In dit artikel worden de wijzigingen in de lijst toegelicht.
    Keywords: Coleoptera ; Carabidae ; Nederland ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 4
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.1
    Publication Date: 2017-03-16
    Description: Hoe een leek op het gebied van wespen en bijen toch een leuke vondst kan doen. Op zonnige dagen gaat de auteur regelmatig op ‘tuinsafari’. Een tuin waarin rekening wordt gehouden met vogels en insecten, door keuze van beplanting en het ophangen van insectenhotels. De inspanningen leverden op 23 juli 2014 een opvallende wesp op. In een bijna automatische reactie werden snel foto’s gemaakt, in de hoop ze later te kunnen determineren. De wesp vloog daarna weg en werd niet meer gezien. Na determinatie blijkt het reuzenertswesp Leucospis dorsigera te zijn, een nieuwe soort bronswesp voor Nederland.
    Keywords: Hymenoptera ; Chalcidoidea ; Leucospis dorsigera ; Nederland ; herkenning ; biologie ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 5
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.27
    Publication Date: 2017-03-16
    Description: De gewone citroenzweefvlieg Xanthogramma pedissequum is een eenvoudig te herkennen zweefvlieg. Tenminste, dat dachten we tot voor kort. Nu blijkt dat de bijna identieke X. dives en X. stackelbergi ook in Nederland rondvliegen. Gelukkig zijn er enkele kenmerken waarmee deze drie soorten citroenzweefvlieg in het veld redelijk herkenbaar blijken. In dit artikel bespreken we deze kenmerken en geven we informatie over verspreiding en vliegtijden van de drie soorten.
    Keywords: Diptera ; Syrphidae ; Xanthogramma dives ; Xanthogramma stackelbergi ; Nederland ; herkenning ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 6
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.55
    Publication Date: 2017-03-16
    Description: Wespblaaskoppen Leopoldius worden ondanks hun opvallende uiterlijk maar weinig waargenomen. De soorten zijn lastig van elkaar te onderscheiden en bovendien werden tot voor kort variabele kenmerken gebruikt, wat tot veel verwarring heeft geleid. Nu blijkt dat alleen vrouwtjes met zekerheid te herkennen zijn aan de vorm van het klampje. Dit is een lepelvormig uitsteeksel onder het vijfde achterlijfsegment. Het wordt gebruikt bij het afzetten van eieren op een gastheer. Waarschijnlijk zijn limonadewespen de belangrijkste gastheer van Leopoldius. In dit artikel wordt een nieuwe soort voor België en een nieuwe soort voor Luxemburg gemeld. Daarnaast wordt een overzicht geboden van waarnemingen in Nederland, België en Luxemburg en een sleutel tot de Noordwest-Europese soorten.
    Keywords: Diptera ; Conopidae ; Leopoldius ; Nederland ; België ; Luxemburg ; herkenning ; biologie ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 7
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.93
    Publication Date: 2017-03-16
    Description: Ondanks de fors toegenomen aandacht voor watermacrofauna sinds begin jaren 1980 is de schietmot Molanna albicans maar sporadisch aangetroffen. In dit artikel wordt de eerste larvenvondst van M. albicans buiten Drenthe beschreven. Samen met de vindplaatsen in Drenthe is de soort nu van vijf vennen in Nederland bekend. Aanvullend worden de determinatiekenmerken aan de hand van foto’s geïllustreerd.
    Keywords: Trichoptera ; Molannidae ; Molanna albicans ; Nederland ; verspreiding ; biologie ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 8
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.81
    Publication Date: 2017-03-16
    Description: Caddisflies are a species rich insect order. The adults are moth-like, but their wings bear hairs instead of scales. The larvae are aquatic and live in self-constructed cases, made of plant material, sand or debris. The species are used as indicators of water quality, but much is still not known about their biology and ecology. In this paper the preferred substrates and phenology of the larvae of 13 species are described, using the data of a survey of two lowland streams in the east of the Netherlands.
    Keywords: Trichoptera ; ecology ; phenology ; Netherlands ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 9
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.37
    Publication Date: 2017-03-16
    Description: Slakkendodende vliegen danken hun naam aan hun roofzuchtige, parasitaire larven, die het op slakken gemunt hebben. Uit België en Nederland zijn circa 60 soorten uit deze familie bekend, maar er zijn er zeker meer te ontdekken. Dit artikel meldt een nieuwe soort voor de Nederlandse fauna uit het genus Psacadina, dat in beide landen drie soorten telt. De herkenning en het voorkomen van de drie soorten wordt uitgebreid besproken.
    Keywords: Diptera ; Sciomyzidae ; Psacadina ; Nederland ; België ; biologie ; herkenning ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 10
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.33
    Publication Date: 2017-03-16
    Description: Zwarte vliegen behoren tot de muggen, maar door hun korte antennen doen ze oppervlakkig aan vliegen denken. De mannetjes zien er met hun grote kop en grote ogen heel anders uit dan de vrouwtjes, die een kleine kop met kleine ogen hebben. In het voorjaar vormen sommige soorten opvallend grote zwermen op windluwe plekken. Aan de 17 soorten die reeds uit Nederland bekend waren, kan er nu één worden toegevoegd: Bibio venosus.
    Keywords: Diptera ; Bibionidae ; Bibio venosus ; herkenning ; biologie ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 11
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.11
    Publication Date: 2017-03-16
    Description: Astrobunus laevipes is een hooiwagen die via het Rijnbekken recentelijk ons land is binnengekomen. Er waren al vondsten langs de Waal en Nederrijn in Gelderland en het meest oostelijke puntje van de provincie Utrecht. Door gerichte inventarisaties kunnen wij de hooiwagen nu nieuw voor de provincies Zuid-Holland en Noord-Brabant melden. Daarnaast is er van A. laevipes nu ook een waarneming langs de IJssel en enkele westelijker in de provincie Utrecht. Allerlei rivierbegeleidende biotopen langs (uitlopers van) de Nederrijn en Waal worden al door deze opmerkelijke hooiwagen bevolkt, maar de noordelijke uitbreiding via de IJsselvallei lijkt veel trager te verlopen. De Maas lijkt nog niet bereikt.
    Keywords: Opiliones ; Astrobunus leavipes ; Nederland ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 12
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.43
    Publication Date: 2017-03-16
    Description: De familie der sluipvliegen is één der soortenrijkste vliegenfamilies in ons land. De larven ontwikkelen zich inwendig in ongewervelden, veelal vlinderrupsen. De familie is in ons land relatief goed bestudeerd. In dit artikel wordt wederom een soort voor het eerst uit ons land vermeld. Hiermee komt het totaal aantal soorten dat in Nederland ooit vastgesteld is op 334.
    Keywords: Diptera ; Tachinidae ; Pexopsis aprica ; Nederland ; verspreiding ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 13
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.111
    Publication Date: 2017-03-16
    Description: Mariene borstelwormen vormen een ecologisch belangrijke, soortenrijke groep. Van diverse families is niet veel bekend over het voorkomen in Nederland en de bamboewormen (familie Maldanidae) behoren tot de slechtst bekende groepen. Bamboewormen danken hun naam aan de lange en aan het uiteinde verdikte segmenten. In dit artikel wordt een nieuwe bamboeworm voor Nederland besproken en een opsomming gegeven van de nu bekende inheemse soorten.
    Keywords: Polychaeta ; Maldanidae ; Micromaldane ornithochaeta ; Nederland ; herkenning ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 14
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.47
    Publication Date: 2017-03-16
    Description: Slakkendodende vliegen zijn nog relatief slecht onderzocht in ons land, zeker de kleine soorten. De vertegenwoordigers van het genus Anticheta zijn kleine vliegjes, waarvan slechts twee soorten uit ons land bekend waren. Uitgebreider onderzoek, zowel in collecties als in het veld, heeft twee nieuwe soorten voor de fauna aan het licht gebracht: Anticheta nigra en A. obliviosa. Van de eerste soort waren wereldwijd slechts acht exemplaren bekend.
    Keywords: Diptera ; Sciomyzidae ; Anticheta ; Nederland ; herkenning ; biologie ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 15
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.37
    Publication Date: 2017-03-16
    Description: Zelfs in een goed onderzochte insectengroep als de zweefvliegen zijn nog altijd nieuwe soorten voor de Nederlandse fauna te ontdekken. Ook in 2014 was het weer raak, dit keer in het fraaie natuurgebied rond de Drentsche Aa. Het lijkt niet toevallig dat deze aanvulling op de Nederlandse fauna juist hier werd gevonden. Deze vindplaats vult ecologische informatie uit het buitenland aan, waardoor langzamerhand een beeld begint te ontstaan van de levenswijze van deze zeldzame zweefvlieg, waarover tot voor kort weinig bekend was.
    Keywords: Diptera ; Syrphidae ; Cheilosia frontalis ; Nederland ; herkenning ; biologie ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 16
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.75
    Publication Date: 2017-03-16
    Description: De doornkaakzandbij ziet er in het voorjaar een beetje anders uit dan in de zomer. Daarom worden de voorjaarsdieren door sommigen tot een andere soort beschouwd dan de zomerdieren. Uit Nederland zijn slechts drie exemplaren bekend: twee uit het voorjaar en één uit de zomer. Toevallig komen alle exemplaren uit hetzelfde gebied. Of is dit geen toeval?
    Keywords: Hymenoptera ; Apoidea ; Andrenidae ; Andrena trimmerana ; Nederland ; herkenning ; verspreiding ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 17
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.29
    Publication Date: 2017-03-16
    Description: Elfjes behoren tot de vroegste zweefvliegen die in het voorjaar uit de pop kruipen. Rond bloeiende wilgen wemelt het vaak van wilgenelfjes Melangyna lasiophthalma, waardoor het zoeken naar de zeldzamere soorten soms lastig is. Toch zijn de meeste soorten relatief makkelijk van elkaar te onderscheiden. Met de vondst van het Sachalinelfje M. pavlovskyi wordt het echter weer iets lastiger.
    Keywords: Diptera ; Syrphidae ; Melangyna pavlovskyi ; Nederland ; herkenning ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 18
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.19
    Publication Date: 2017-03-16
    Description: Steltmuggen lijken op langpootmuggen en zijn daar nauw aan verwant. Veel soorten zijn groot en karakteristiek gekleurd, maar toch zijn ze in Nederland nog weinig bestudeerd. Dit artikel bewijst dat er nog veel te ontdekken valt: in één jaar tijd zijn drie soorten gevonden die nog niet uit ons land bekend waren: Atypophthalmus inustus, Molophilus niger en Arctoconopa melampodia. Hiermee komt het totaal aantal soorten voor Nederland op 149. De nieuwe meldingen sluiten goed aan op het bekende verspreidingsgebied.
    Keywords: Diptera ; Limoniidae ; Nederland ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 19
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.9
    Publication Date: 2017-03-16
    Description: Jalla dumosa is een in Nederland zeer zeldzame pentatomide, die in 1969 voor het laatst was waargenomen op Terschelling. Na 45 jaren zonder waarnemingen werd ze in 2014 weer in klein aantal waargenomen in de Kooiduinen op Ameland. Rupsen van onder andere de duinparelmoervlinder en de sint-jansvlinder stonden daar op het menu. In deze bijdrage wordt informatie samengevat over de vondsten in Nederland, de biologie en de verspreiding van de soort.
    Keywords: Heteroptera ; Pentatomidae ; Jalla dumosa ; Nederland ; verspreiding ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 20
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.103
    Publication Date: 2017-03-16
    Description: In August 2014 the exotic jellyfish Blackfordia virginica was captured in the harbour of Amsterdam. This is the first confirmed record of this species in the Netherlands, although in October 2013 a possible specimen was filmed and released. This indicates that the species might be established in the Amsterdam area, although repeated introduction with ballast water cannot be ruled out. In September 2014 hydrozoan polyp colonies closely resembling those of B. virginica were collected near IJmuiden in the Noordzeekanaal, a canal connecting Amsterdam with the North Sea at IJmuiden.
    Keywords: Cnidaria ; Hydrozoa ; Blackfordia virginica ; Netherlands ; exotic species ; distribution ; identification ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 21
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.1
    Publication Date: 2017-03-16
    Description: Wie een steen of boomstronk omkeert en voor het eerst een Trogulus opmerkt, zal dit bizarre beest niet direct associëren met een hooiwagen. Met de korte, stevige poten, het afgeplatte achterlijf dat overdekt is met strooisel en zand, en een trage manier van voortbewegen is het een ongewone verschijning. De soorten van dit geslacht zijn bodembewoners die zich voornamelijk voeden met kleine huisjesslakken. Uit ons land waren tot nu toe twee soorten bekend. De identiteit van een van die twee was lang onzeker, maar door nieuwe inzichten is nu duidelijk om welke soort het werkelijk gaat. In Nederland blijkt bovendien nog een derde soort voor te komen, die hier voor het eerst gemeld wordt.
    Keywords: Opiliones ; Trogulidae ; Trogulus ; Nederland ; herkenning ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 22
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.47
    Publication Date: 2017-03-16
    Description: Roofvliegen zijn met 40 Nederlandse soorten een vrij kleine groep, die behoorlijk goed is onderzocht. Het gebeurt dan ook niet vaak dat er een nieuwe soort voor de Nederlandse fauna kan worden opgetekend. De meeste roofvliegen zijn grijze vliegen, zo niet de stamjagers van het genus Choerades. Dit zijn juist vrij opvallend gekleurde vliegen. Zo heeft de rode dennenstamjager Choerades gilvus een rood gekleurd achterlijf. Opmerkelijk genoeg blijkt dat in Nederland juist onder deze opvallende verschijning twee soorten schuilgaan.
    Keywords: Diptera ; Asilidae ; Choerades igneus ; Nederland ; verspreiding ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 23
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.43 (2014) p.23
    Publication Date: 2017-03-16
    Description: Onlangs werd op een braakliggend terrein in Roermond de zaadkever Bruchus brachialis verzameld. Dit is de eerste Nederlandse vondst van deze zuidelijke soort. Een reeks recente waarnemingen uit de ons omringende landen laat zien dat deze soort al enige jaren in een noordwaartse areaaluitbreiding verwikkeld is. Met deze ontdekking komt het aantal Nederlandse Bruchus-soorten op zeven.
    Keywords: Coleoptera ; Chrysomelidae ; Nederland ; herkenning ; biologie ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 24
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.63
    Publication Date: 2017-03-16
    Description: Nieuw gevormd landschap, zoals jonge duinvalleien, opgespoten polders en bedrijventerreinen in ontwikkeling vormen de habitat van gespecialiseerde soorten. Je moet tegen een stootje kunnen om in een dergelijke zandige, schaars begroeide omgeving te overleven. Vooral langdurig warme, droge perioden vormen een probleem voor vochtminnende bodemdieren. De springstaartsoorten die hier overleven zijn warmteminnend en droogteresistent, een bijzondere combinatie voor bodemdieren. Dit geldt ook voor Entomobrya unostrigata, een nieuwe aanwinst voor de fauna van Noordwest-Europa. Er is een aantal populaties van deze soort op de Tweede Maasvlakte gevonden. De dieren zaten hier onder stenen en hout op opgespoten zand.
    Keywords: Collembola ; Entomobryidae ; Entomobrya unostrigata ; Nederland ; herkenning ; verspreiding ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 25
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.71
    Publication Date: 2017-03-16
    Description: De Polychaeta vormen een groep van vrijwel uitsluitend mariene wormen, gekenmerkt door een geleed lichaam met aan de meeste leden een tamelijk groot aantal borstels. Het is een soortenrijke groep; ze spelen een belangrijke rol in de ecologie en diversiteit van vooral zachte, maar ook harde zeebodems. In vergelijking met de kreeftachtigen en weekdieren, eveneens soortenrijke groepen in dezelfde biotoop, zijn borstelwormen minder goed onderzocht. In dit artikel wordt de zeerups Fimbriosthenelais minor nieuw voor ons land gemeld. Met name op stenige en schelprijke bodems zijn nog meer nieuwe borstelwormen voor ons land te verwachten.
    Keywords: Polychaeta ; Sigalionidae ; Fimbriosthenelais minor ; Nederland ; herkenning ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 26
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.42 (2014) p.55
    Publication Date: 2017-03-16
    Description: Het kalkdoorntje is een zeldzame sprinkhanensoort, die vooral bekend is uit Zuid-Limburg en van enkele locaties in het rivierengebied. Over het voorkomen van dit kleine sprinkhaantje binnen de Gelderse Poort was lange tijd weinig bekend. Pas vanaf 2007 worden regelmatig waarnemingen gedaan. Toevallige waarnemingen op, voor de auteur, onverwachte locaties vormden de aanleiding voor een grondige inventarisatie in de jaren 2011-2013. Hieruit komt naar voren dat het kalkdoorntje een ruime verspreiding heeft binnen de Gelderse Poort en een meer diverse biotoopkeuze heeft dan voorheen bekend was.
    Keywords: Orthoptera ; Tetrigidae ; Tetrix tenuicornis ; verspreiding ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 27
    Publication Date: 2021-05-19
    Description: The pearl oyster Pinctada radiata and the cockle Cerastoderma glaucum are among the most abundant bivalve molluscs in southern Tunisian waters. These species are not currently subject to any investigation despite their important economic value in the world. For this reason, their biological parameters, their spatial distribution and their stock assessment were undertaken in the Gulf of Gabes. The reproductive cycle was studied in relation to variations of the environment parameters. The specimens were collected monthly during one year (2007) in sites of El Kraten and El Jorf (Kerkennah Islands) for the first species and sites of Sidi Mansour and El Hicha (North of Sfax and Gabes) for the second. An intraspecific polymorphism biometric trait for P. radiata and C. glaucum was performed using statistical comparison methods and multivariate analysis methods. Results of analyzes showed heterogeneity between populations. For Pinctada radiata, the sex ratio unbalanced, although males dominated among smaller individuals and females were predominant in larger size-classes. Evidence of protrandric hermaphroditism was observed with males maturing earlier than females. Seasonal changes in macroand microscopic properties of the gonads of both sexes showed that this species displayed a clearly defined annual reproductive cycle with a major peak in summer and a minor peak in autumn. The onset of reproduction appears to be triggered by the rising seawater temperature during spring and summer. P. radiata exhibited a short resting phase that occurred simultaneously in both sexes from the end of December until early February. For Cerastoderma glaucum, the overall samples presented a balanced sex ratio, with males dominating among smaller individuals and females predominating in larger size classes. The seasonal changes assessed through macro- and microscopic properties in the gonads of both sexes indicated a clearly defined annual reproductive cycle. Reproductive activity of C. glaucum was greatest from spring to late autumn, with two reproductive peaks (May and November). Gametogenic activity in both sexes was apparently triggered by the rising seawater temperature during spring and summer. These results support previous findings of latitudinal changes in the reproductive behaviour of C. glaucum. Due to the extensive period of gonadal activity, C. glaucum exhibited a short resting phase that occurred simultaneously in both sexes throughout January and February. In terms of stock assessment and spatial distribution of P. radiata, results showed a scattered distribution pattern of the species according to location and depth ranging between 0 and 145 ind.m-². P. radiata was encountered from the intertidal zone to 40 m depth, with a highest population densities recorded at depth range of 2-20 m. The total stock was estimated to be 27584.9 ± 11504.5 million individuals. Oyster distribution seems influenced by the substrate type. This high population of pearl oysters was associated with large cover of seagrass Posidonia oceanica which provides an excellent substratum for attachment. The littoral zone seems not to be the preferred habitat for the proliferation of this immigrant species. Oysters’ size increased steadily with depth, ranging from a mean of 37.98 ± 0.40 mm SH at 0-1 m to 60.98 ± 0.68 mm SH at 20-100 m depth range. Size structure analysis showed that deep water population was dominated by large individuals reaching 96 mm SH. In terms of geographical occupation and stock assessment of C. glaucum, results showed a scattered distribution pattern of the species according to location. The consequence was a remarkable biomass which represented 4736 tons of total fresh weight and high abundance levels reaching over 1982 million individuals estimated in the area of 20122 hectares. In conclusion, this study is the first report of an extraordinary abundance of Pinctada radiata and Cerastoderma glaucum in southern Tunisian waters. It gives more information about their stocks in the colonization area. The data may help to determine future quantitative changes indicating trends in the study area that are exposed to various factors of environmental conditions and human activities.
    Description: Submitted
    Description: ABONDANCE
    Description: BILOGIE
    Description: Pinctada radiata
    Description: Cerastoderma glaucum
    Description: Huitre perlière
    Keywords: Abundance ; Biology ; Shellfish
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Phd thesis
    Format: 170
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  • 28
    Publication Date: 2021-05-19
    Description: Instittuto Nacional de Investigaçao Pesqueira, INIP, luanda , Angola
    Description: Bachelors
    Description: Trabaho de fin cdoursado para obtençâo do grau de licenciatura em Biologica
    Description: Published
    Description: biologia marinha, fitoplâncton, limnologia, algas
    Description: marine biology, phytoplankton, algae,
    Keywords: Phytoplankton ; Nannoplankton ; Biology ; Limnology ; Algae
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Bachelor thesis
    Format: 56
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  • 29
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    Nature Publishing Group (NPG)
    Publication Date: 2014-12-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2014 Dec 18;516(7531):S72. doi: 10.1038/516S72a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25517243" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; China ; Cities ; Periodicals as Topic/statistics & numerical data ; Research/standards/*statistics & numerical data/trends ; Universities/statistics & numerical data
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 30
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    Nature Publishing Group (NPG)
    Publication Date: 2014-12-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2014 Dec 18;516(7531):S69. doi: 10.1038/516S69a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25517242" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; China ; Cities ; Periodicals as Topic/statistics & numerical data ; Physics ; Research/standards/*statistics & numerical data/trends ; Universities/statistics & numerical data
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 31
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2014-01-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brenner, Sydney -- New York, N.Y. -- Science. 2014 Jan 17;343(6168):262. doi: 10.1126/science.1249912.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore, 138673.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24436413" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; England ; History, 20th Century ; History, 21st Century ; Molecular Biology/*history ; *Nobel Prize ; Sequence Analysis, DNA/*history/methods
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 32
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.79
    Publication Date: 2015-12-09
    Description: The relative sensitivities of 309 common invertebrate species in Dutch marine waters are presented for environmental and anthropogenic pressures like organic enrichment, sedimentation and fisheries. The species were furthermore appointed to trophic groups like suspension and deposit feeders. The Dutch Ministry of Infrastructure and the Environment uses these data when calculating the Benthic Ecosystem Quality Index 2 and the Infaunal Trophic Index. These metrics aid in the mandatory monitoring of ecological quality for example for the European Water Framework Directive. The common Dutch species were selected based on their abundance according to, 1. the mwtl dataset including results of on-going monitoring programs issued by the Ministry, 2. the monitoring by volunteer scuba-divers for the anemoon Foundation and 3. the monitoring of fouling plates for the project setl.
    Keywords: macrozoobenthos ; marine ; Netherlands ; environment ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 33
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.43
    Publication Date: 2015-12-09
    Description: Onze fauna verandert en de mariene fauna is daarop geen uitzondering. Zuidelijke soorten koloniseren onze kustwateren en exotische soorten worden door de mens aangevoerd. Voor sommige soorten is niet duidelijk waarom ze hier opduiken. De sterk veranderende kustbiotopen spelen ongetwijfeld eveneens een rol. Een niet-aflatende stroom onverwachte soorten, soms zelfs behorend tot nieuwe genera en zelfs families maken faunistisch onderzoek in de kustwateren verrassend en boeiend. In het kader van een inventarisatie van kreeftachtigen in het Deltagebied werden in de Oosterschelde bij Zierikzee verscheidene kleine monsters genomen van diverse substraten. De monsters van roodwieren bevatten een aantal opmerkelijke soorten. Dit artikel behandelt Uromunna spec., een zeepissebeddensoort van een familie die in ons land nog niet was aangetroffen.
    Keywords: Isopoda ; Munnidae ; Nederland ; Uromunna ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 34
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.31
    Publication Date: 2015-12-09
    Description: This paper describes the discovery of a settled juvenile specimen of the stomatopod Platysquilla eusebia on the Dutch part of the Dogger Bank in the central North Sea. This is the northernmost record in Europe. The species is native to the Mediterranean and to the Atlantic coast from Portugal up to France. Further investigations have to show if the species already forms populations this far north. As the planktonic stages of P. eusebia have already been recorded in prior years, the establishment of the species should not be a problem, providing the circumstances are favourable.
    Keywords: Malacostraca ; Stomatopoda ; Platysquilla eusebia ; distribution ; Netherlands ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 35
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.1
    Publication Date: 2015-12-09
    Description: Met enige regelmaat duiken nieuwe springstaartsoorten op in ons land. Het vinden van een nieuwe soort is soms op toeval gebaseerd. Op een foto van een sprinkhaan was naast de linker voorpoot een klein, donker vlekje te zien. Uitvergroot bleek het om een klein springstaartje te gaan. Het zwart-wit gestreepte patroon liet geen ruimte voor twijfel over de determinatie: Fasciosminthurus quinquefasciatus, een nieuwe springstaart voor de Nederlandse fauna. In dit artikel wordt het genus en de soort voorgesteld, beschrijven we de habitat en geven we informatie over de verspreiding in de rest van Europa.
    Keywords: Collembola ; Bourletiellidae ; Fasciosminthurus quinquefasciatus ; Nederland ; verspreiding ; herkenning ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 36
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.49
    Publication Date: 2015-12-09
    Description: De roodbruine heiderouwzwever Exoprosopa capucina is een fraaie en karakteristieke koffiebruine verschijning op de Nederlandse heideterreinen. Zoals veel wolzwevers is deze te herkennen aan de vleugeltekening en de kleur van de lichaamsbeharing. Echter naarmate de dieren ouder worden verliezen ze deze beharing en wordt de determinatie lastiger. Vermoedelijk heeft het verfomfaaide uiterlijk van een vrouwtje Exoprosopa cleomene er voor gezorgd dat deze ruim 50 jaar onopgemerkt tussen de exemplaren van E. capucina heeft gestaan.
    Keywords: Diptera ; Bombyliidae ; Exoprosopa cleomene ; Nederland ; verspreiding ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 37
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.7
    Publication Date: 2015-12-09
    Description: In de afgelopen jaren werd op verschillende plekken in Nederland een houtzwamkever gevonden die tot nu toe niet officieel gemeld werd: Sulcacis bidentulus. Deze soort valt binnen de zeer eenvormige familie Ciidae op door de kleur van de dekschilden, die duidelijk iets lichter bruin zijn dan de rest van het lichaam. De soort zou zich ontwikkelen in de bleke borstelkurkzwam, die voornamelijk op populieren groeit. Oudere vondsten ontbreken en de ontdekking van deze soort op meerdere locaties duidt op een recente vestiging in ons land. Dit sluit aan bij de geconstateerde uitbreiding in Midden-Europa.
    Keywords: Coleoptera ; Ciidae ; Sulcacis bidentulus ; Nederland ; verspreiding ; biologie ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 38
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.35
    Publication Date: 2015-12-09
    Description: De boomkrekel is een slanke geelbruine krekel, die vooral opvalt door zijn melodieuze zang. Vroeger moest je naar Frankrijk om dit geluid te horen, maar tegenwoordig heerst ook in het rivierengebied bij Nijmegen een mediterrane sfeer. De boomkrekel is in 2004 voor het eerst langs de Waal gevonden en heeft zich daarna uitgebreid. In 2010 en 2011 heeft de Flora- en faunawerkgroep Gelderse Poort met vele vrijwilligers onderzoek gedaan naar de precieze verspreiding. In totaal werd de boomkrekel in 57 kilometerhokken gevonden en de verwachting is dat de soort zich de komende jaren verder zal uitbreiden.
    Keywords: Orthoptera ; Oecanthus pellucens ; Nederland ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 39
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.55
    Publication Date: 2015-12-09
    Description: Hongerwespen behoren tot de grote groep van de sluipwespen. Het zijn slanke wespjes die typisch met hangende pootjes vliegen, waarbij de verbrede achterschenen opvallen. Ze parasiteren bijen en mogelijk ook bepaalde angeldragende wespen en worden daarom vaak bij bijenhotels waargenomen. In het kader van dit artikel zijn de meldingen van Nederlandse hongerwespen kritisch beschouwd. In totaal zijn nu negen soorten uit ons land bekend, waarvan er hier maar liefst zes voor het eerst worden gemeld.
    Keywords: Hymenoptera ; Evanioidea ; Gasteruptiidae ; Nederland ; verspreiding ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 40
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.69
    Publication Date: 2015-12-09
    Description: As most of the sea bottom in the Dutch part of the North Sea consists of sand, marine fauna that live in association with hard substrates are rarely monitored. We report here on the results of a species inventory in June 2011 done by scuba-diving while focusing on a wreck on the Dogger Bank and on rocky bottoms on the Cleaver Bank. This resulted in various new records of species for the Dutch part of the North Sea. This result appeared for a large part linked to the added value of monitoring with scuba-divers. It is therefore concluded that scuba-divers should be used in addition to the more traditional monitoring methods in which dredges and grabs are used, if one aims at getting an accurate view of the biodiversity present in marine regions like the North Sea.
    Keywords: biodiversity ; hard substrata ; Netherlands ; marine ; scuba-diving ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 41
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.59
    Publication Date: 2015-12-09
    Description: Five years after the commissioning of the offshore wind farm Egmond aan Zee, the monopiles and the rocks of the scour protection layers were covered by a wide variety of marine organisms. This paper describes the results of qualitative and quantitative assessments carried out in 2008 and 2011. The assessments were based on video footage, pictures and samples collected by divers at three different wind turbines. The ecological relevance of identified taxa is also discussed.
    Keywords: offshore wind farms ; Netherlands ; biodiversity ; benthic zone ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 42
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.39
    Publication Date: 2015-12-09
    Description: De gouden kegelbij Coelioxys aurolimbata is uit ons land recent alleen bekend uit de zuidelijke helft van Limburg. Vóór 1960 kwam deze parasiet van de lathyrusbij Chalicodoma ericetorum ook in het rivierengebied voor. In juli van dit jaar werd de gouden kegelbij gevangen in Duiven. Mogelijk is dit de voorbode van een herovering van het rivierengebied door deze bedreigde soort.
    Keywords: Hymenoptera ; Apoidea ; Megachilidae ; Nederland ; Coelioxys aurolimbata ; verspreiding ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 43
    Publication Date: 2015-12-09
    Description: During an expedition with scuba-divers to the Dutch part of the Brown Ridge in the central North Sea in June 2013, two colonies of the jewel anemone Corynactis viridis were found on the wreck Anna Graebe. With the jewel anemone both a new species and a new animal order, the Corallimorpharia, are added to the autochthonous fauna of the Netherlands. This species typically occurs in the Mediterranean and along the Atlantic coast from Portugal and the west British Isles up to Shetland. As other records of settled colonies of C. viridis in the North Sea were recently reported from Belgian, German and English waters, it is concluded that the jewel anemone, which used to be known as an occasional visitor, should now be considered autochthonous in the North Sea.
    Keywords: Cnidaria ; Corallimorpharia ; Netherlands ; Corynactis viridis ; distribution ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 44
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.15
    Publication Date: 2015-12-09
    Description: In de bodem van de Noordzee leeft een bijzondere groep van kreeften. Zij brengen hun leven door in een ondergronds gangenstelsel: de molkreeften. Het zijn algemene bewoners van het Friese Front, de Oestergronden en de Klaverbank. In, op en bij deze kreeften leven verschillende andere diersoorten: parasitaire pissebedden, een mosdiertje en twee soorten tweekleppigen. Deze bijdrage gaat in op de ecologie van de molkreeften en hun symbionten.
    Keywords: Decapoda ; Upogebiidae ; Upogebia ; Nederland ; biology ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 45
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.1
    Publication Date: 2015-12-09
    Description: Bryozoa or moss animals constitute a conspicuous and species-rich component of hardsubstrate benthic communities in marine and estuarine habitats. To gain insight into the biodiversity of these habitats, knowledge of bryozoan species is indispensable. Since the last comprehensive publication on Dutch species in 2004 much new information has become available. Particularly from the Dutch part of the Continental Flat of the North Sea, the largest natural area of the Netherlands, many new records have been collected. Other reasons to present an updated review are changes in nomenclature, the arrival of some exotic species and identification issues.
    Keywords: Bryozoa ; Netherlands ; checklist ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 46
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.35
    Publication Date: 2015-12-09
    Description: Heleomyzidae zijn kleine tot middelgrote vliegen. Ze krijgen niet veel aandacht, omdat de meeste soorten een nogal verborgen leven leiden en bovendien niet opvallend gekleurd of getekend zijn. De Nederlandse familienaam, afvalvliegen, is voor de meeste soorten niet echt passend, maar veel soorten van de subfamilie Heteromyzinae, waartoe Tephrochlaena oraria behoort, worden dan wel weer vaker rond afval aangetroffen. Tephrochlaena oraria is echter in meerdere opzichten een buitenbeentje. Met deze soort komt de lijst van Nederlandse Heleomyzidae op 49.
    Keywords: Diptera ; Heleomyzidae ; Tephrochlaena oraria ; Nederland ; verspreiding ; herkenning ; biologie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 47
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.9
    Publication Date: 2015-12-09
    Description: Cucujus cinnaberinus is een recent voor Nederland ontdekte soort. De kever staat op de Habitatrichtlijn, wat onder meer betekent dat hij beschermd is en dat de populatie gemonitord dient te worden. Inventarisatie en monitoring gebeurt in het algemeen door het weghalen van schors van recent gestorven bomen. Hierdoor wordt het leefgebied van de kever echter flink aangetast. Wij voerden een klein onderzoek uit naar de mogelijkheden om C. cinnaberinus te vangen in azijnzuurvallen, zodat de habitat intact gelaten kan worden en de soort toch geïnventariseerd kan worden. Tijdens het voorjaar van 2013 werden vier vallen opgehangen op een locatie waar zich een populatie van deze soort bevindt. Er werden slechts twee individuen verzameld; de vangmethode lijkt dus niet bijzonder geschikt.
    Keywords: Coleoptera ; Cucujidae ; Cucujus cinnaberinus ; methode ; inventarisatie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 48
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.95
    Publication Date: 2015-12-09
    Description: The tanaid Zeuxo holdichi, described in 1990 from Arcachon Bay in southwest France, has since then been recorded from west Portugal to northern Brittany and southwest England. The species is recorded here from the Netherlands, a further northward expansion of the range. It is hypothesised that Z. holdichi may be non-native to Europe.
    Keywords: Crustacea ; Tanaidae ; Zeuxo holdichi ; Netherlands ; distribution ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 49
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.41 (2013) p.49
    Publication Date: 2015-12-09
    Description: This paper reports on observations made during wreck dive expeditions in 2010-2012, in order to investigate the ecological relevance of shipwrecks on the Dutch Continental Shelf (dcs). Shipwrecks are biodiversity hotspots. The number of species recorded on shipwrecks is similar to the number of species found in soft bottoms of the entire dcs. The soft substrates, however, represent a vastly larger habitat on the dcs than the shipwrecks. Amongst many other taxa, juvenile and large Atlantic cod, linear skeleton shrimp, goldsinny wrasses and leopard spotted gobies were found in the shipwreck habitats. The presence of these important species and their absence from many other habitats, illustrate that shipwrecks function as key habitats, nurseries, and refugia that are rare or absent anywhere else in the Netherlands.
    Keywords: shipwrecks ; Netherlands ; biodiversity ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 50
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.23
    Publication Date: 2015-12-09
    Description: Wolzwevers zijn vliegen waarvan de larven parasitair leven bij andere insecten. Wolzwevers van het genus Villa veroorzaken vaak determinatieproblemen. Deze problemen lijken verleden tijd met recent gepubliceerde taxonomische inzichten. Eindelijk konden nu ook de Nederlandse exemplaren van dit genus op naam gebracht worden. Deze bleken te behoren tot vier soorten, waarvan er twee vermoedelijk reeds zijn verdwenen.
    Keywords: Diptera ; Bombyliidae ; Villa hottentotta ; Nederland ; verspreiding ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 51
    Publication Date: 2015-12-09
    Description: Sluipwespen van de groep van de Polysphinctini hebben een bijzondere levenswijze. Het vrouwtje van wesp legt een eitje op het achterlijf van een spin. Wanneer het eitje is uitgekomen brengt de larve haar hele leven op het achterlijf van de spin door. Ze maakt kleine wondjes in de huid en voedt zich met lichaamsvloeistof van de spin. Na verloop van tijd ontwikkelt de larve bulten op de rug, een teken dat ze bijna volgroeid is. Ze zuigt dan de spin leeg, de ‘grote slurp’ genaamd, en verpopt zich in het web. In dit artikel wordt de levenswijze van één van deze soorten, Acrodactyla quadrisculpta, voor het eerst beschreven en geïllustreerd.
    Keywords: Hymenoptera ; Ichneumonidae ; Araneae ; Tetragnathidae ; biologie ; Nederland ; Acrodactyla quadrisculpta ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 52
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.15
    Publication Date: 2015-12-09
    Description: De bladwespgenera Phyllocolpa, Tubpontania, Pontania en Euura hebben gemeenschappelijk dat ze gallen vormen op wilg. Recentelijk is er veel vernieuwend taxonomisch werk verricht aan deze groepen. In dit artikel wordt de Nederlandse situatie samengevat. Uit oudere literatuur waren 18 soorten bekend en in het recent gepubliceerde gallenboek worden nog eens 11 soorten voor het eerst voor ons land vermeld. In dit artikel worden nog acht soorten aan de lijst toegevoegd en twee soorten worden van de lijst afgevoerd. In totaal zijn nu 35 soorten galvormende bladwespen van wilg uit Nederland bekend.
    Keywords: Hymenoptera ; Tenthredinidae ; Nematinae ; Nederland ; verspreiding ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 53
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.15
    Publication Date: 2015-12-09
    Description: Snuitvliegen zijn rare snuiters onder de zweefvliegen. Ze hebben een verlengd gezicht en een lange tong. Hiermee kunnen ze foerageren op bloemen met diepliggende nectar, in tegenstelling tot de meeste andere zweefvliegen. Als genus zijn de vliegen makkelijk herkenbaar, maar de zeer zeldzame soorten tussen de zeer algemene gewone snuitvlieg uithalen was niet altijd even makkelijk. In dit artikel wordt de herontdekking van de rode snuitvlieg beschreven en een tabel gegeven voor de drie Noordwest-Europese soorten.
    Keywords: Diptera ; Syrphidae ; Rhingia rostrata ; Nederland ; verspreiding ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 54
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.89
    Publication Date: 2015-12-09
    Description: De larven van Trichoptera heten kokerjuffers en leven in het water. Veel soorten bouwen een kokertje van zand, takjes of ander materiaal, vandaar de Nederlandse naam. De volwassen dieren lijken wel wat op nachtvlinders en worden schietmotten genoemd. De laatste jaren heeft het onderzoek naar deze dieren een grote vlucht genomen. Enerzijds spelen ze een rol als indicator voor de waterkwaliteit. De larven worden dan ook veel verzameld tijdens macrofaunabemonsteringen door waterschappen. Anderzijds is er een groeiende groep entomologen die schietmotten bestudeert. In dit artikel wordt Ecclisopteryx dalecarlica voorgesteld, een nieuwe soort voor Nederland.
    Keywords: Trichoptera ; Limnephilidae ; Ecclisopteryx dalecarlica ; Nederland ; Belgie ; verspreiding ; herkenning ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 55
    Publication Date: 2021-05-19
    Description: A yield per recruit model has been used to compare the effects of mesh size increment on the yields and revenues of the fisheries of Cameroon under two different cases. Case 1 assumes the commercial fishery to move from the exploitation of three age-groups to two age-groups with no interactions with the artisanal fishery, whereas Case 2 takes into account these interactions. The difference in the percentage increase of yield per recruit between case 1 and case 2 is 61% at current fishing (46% and 18% yield per recruit increment in cases 1 and 2 respectively). The usually accepted long-term yield per recruit increment with increase of age at first capture (with a single non-interacting fisheries) is, in this case, cancelled out. However, the revenues increase by 72% and 63% in cases 1 and 2 respectively. Therefore the economic approach, compared with purely biological analyses, is more convincing. In general, as fisheries always interact, a single-fishery management approach should not be the rule as it is at present; management strategies should consider interactions between different fisheries and be based on their economic performances and not, as said earlier, on purely biological considerations. This is because a biological approach to fisheries management will, at best, be modified by economic factors, or, at worst, be ignored totally in favour of economic policies.
    Description: Published
    Keywords: Biology ; Fisheries ; Biological interaction ; Sciaenidae ; Fisheries development ; Fishery management ; Yield/recruit ; Commercial fisheries ; Artisanal fishing
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 56
    Publication Date: 2021-05-19
    Description: Published
    Description: Chinchard (Trachuurus trecae)
    Description: Biologie
    Keywords: Biology ; Exploitation
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 57
    Publication Date: 2021-05-19
    Description: Published
    Description: langoustes
    Description: marquage
    Description: poisson
    Keywords: Lobsters ; Biology ; Ecology ; Aquatic biology
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 58
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    In:  ???
    Publication Date: 2013
    Description: Simulationen mithilfe des Models 4C zu möglichen Auswirkungen der Klimaänderungen des RCP 8.5 Klimaszenariums auf Wälder in Deutschland Kiefer Fichte Eiche Buche KATASTER-BESCHREIBUNG: Auswirkungen des Klimawandels (Temperatur, Niederschlag, CO2-Gehalt der Atmosphäre) auf die Wälder KATASTER-DETAIL: Delta T (Frühjahr) + und Delta Nied (Frühjahr) -, dann Produktivität der Wälder -; Delta C02 + um 25 - 30 %, dann Produktion der Wälder + um 9 - 20%; Delta T + (an nicht wasserlimitierten Standorten), dann Produktivität der Wälder +; Delta CO2+, dann Wassernutzungseffizienz der Wälder +; Delta T (Sommer) +, dann Waldbrandgefahr +; Delta T (Sommer) + und Delta Nied (Sommer) - (= WaBi -), dann Trockenstress der Wälder + um bis zu 9% und dann Produktivität der Wälder -; Delta T (Sommer) + und Delta Nied (Sommer) -, dann Populationsdichte Kiefern-Großschädlinge +;
    Keywords: Deutschland ; 20. und 21. Jahrhundert ; Boden ; Buche ; Eiche ; Fichte ; Forst ; Kiefer ; Klima ; Niederschlag ; Pflanzenschädling ; Phänologie ; Sturmschaden ; Temperatur ; Trockenheit ; Verdunstung ; Waldbrand ; Waldwachstum ; Wassermangel ; Wind ; Grundwasser ; Modell
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  • 59
    Publication Date: 2013-04-05
    Description: The technological demand to push the gigahertz (10(9) hertz) switching speed limit of today's magnetic memory and logic devices into the terahertz (10(12) hertz) regime underlies the entire field of spin-electronics and integrated multi-functional devices. This challenge is met by all-optical magnetic switching based on coherent spin manipulation. By analogy to femtosecond chemistry and photosynthetic dynamics--in which photoproducts of chemical and biochemical reactions can be influenced by creating suitable superpositions of molecular states--femtosecond-laser-excited coherence between electronic states can switch magnetic order by 'suddenly' breaking the delicate balance between competing phases of correlated materials: for example, manganites exhibiting colossal magneto-resistance suitable for applications. Here we show femtosecond (10(-15) seconds) photo-induced switching from antiferromagnetic to ferromagnetic ordering in Pr0.7Ca0.3MnO3, by observing the establishment (within about 120 femtoseconds) of a huge temperature-dependent magnetization with photo-excitation threshold behaviour absent in the optical reflectivity. The development of ferromagnetic correlations during the femtosecond laser pulse reveals an initial quantum coherent regime of magnetism, distinguished from the picosecond (10(-12) seconds) lattice-heating regime characterized by phase separation without threshold behaviour. Our simulations reproduce the nonlinear femtosecond spin generation and underpin fast quantum spin-flip fluctuations correlated with coherent superpositions of electronic states to initiate local ferromagnetic correlations. These results merge two fields, femtosecond magnetism in metals and band insulators, and non-equilibrium phase transitions of strongly correlated electrons, in which local interactions exceeding the kinetic energy produce a complex balance of competing orders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Tianqi -- Patz, Aaron -- Mouchliadis, Leonidas -- Yan, Jiaqiang -- Lograsso, Thomas A -- Perakis, Ilias E -- Wang, Jigang -- England -- Nature. 2013 Apr 4;496(7443):69-73. doi: 10.1038/nature11934.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23552945" target="_blank"〉PubMed〈/a〉
    Keywords: Biology ; Chemistry ; Circular Dichroism ; Electronics ; Iron/chemistry ; *Magnetic Phenomena ; Magnetics ; Optics and Photonics ; Photosynthesis ; *Quantum Theory ; Temperature ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 60
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    Nature Publishing Group (NPG)
    Publication Date: 2013-12-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McGee, Harold -- England -- Nature. 2013 Dec 19;504(7480):372-4. doi: 10.1038/504372a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24352277" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aspergillus/metabolism ; Beer/microbiology ; Cheese/microbiology ; Chemistry ; *Fermentation ; *Food Technology ; Microbiology ; Saccharomyces cerevisiae/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 61
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    Nature Publishing Group (NPG)
    Publication Date: 2013-09-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2013 Sep 12;501(7466):136.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24032131" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Autobiography as Topic ; Biology ; *Literature, Modern ; Physics ; *Research Personnel ; Self Concept
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 62
    Publication Date: 2013-10-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shechtman, Dan -- England -- Nature. 2013 Oct 17;502(7471):S54-5. doi: 10.1038/502S54a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24132333" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; Developing Countries ; Education/statistics & numerical data ; Entrepreneurship/*economics ; Leadership ; Nobel Prize ; Research ; Technology/*economics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 63
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    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1998
    Description: Planktonic protozoan grazers have the potential to significantly affect the chemistry of particle-associated trace metals. This is due both to the importance of protists as consumers of bacterial-sized particles, and to the unique low-pH, enzyme-rich microenvironment of the grazer food vacuole. This thesis examines the role of protozoan grazers in the marine geochemistry of strongly hydrolyzed, particle-reactive trace metals, in particular Th and Fe. A series of tracer experiments was carried out in model systems in order to determine the effect of grazer-mediated transformations on the chemical speciation and partitioning of radioisotopes C9Fe, 234Th, 51Cr) associated with prey cells. Results indicate that protozoan grazers are equally able to mobilize intracellular and extracellular trace metals. In some cases, protozoan regeneration of trace metals appears to lead to the formation of metal-organic complexes. Protozoan grazing may generate colloidal material that can scavenge trace metals and, via aggregation, lead to an increase in the metal/organic carbon ratio of aggregated particles. Model system experiments were also conducted in order to determine the effect of grazers on mineral phases, specifically colloidal iron oxide (ferrihydrite). Several independent techniques were employed, including size fractionation ors9Fe-labeled colloids, competitive ligand exchange, and iron-limited diatoms as "probes" for bioavailable Fe. Experimental evidence strongly suggests that protozoan grazing can affect the surface chemistry and increase the dissolution rate of iron oxide phases through phagotrophic ingestion. In further work on protozoan-mediated dissolution of colloidal Fe oxides, a novel tracer technique was developed based on the synthesis of colloidal ferrihydrite impregnated with 133Ba as an inert tracer. This technique was shown to be a sensitive, quantitative indicator for the extent of ferrihydrite dissolution/alteration by a variety of mechanisms, including photochemical reduction and ligand-mediated dissolution. In field experiments using this technique, grazing by naturally occuring protistan assemblages was shown to significantly enhance the dissolution rate of colloidal ferrihydrite over that in non-grazing controls. Laboratory and field results indicate that, when integrated temporally over the entire euphotic zone, protozoan grazing may equal or exceed photoreduction as a pathway for the dissolution of iron oxides.
    Description: This work was financially supported by a Department of Defense ONR-NDSEG Graduate Fellowship, Office ofNaval Research AASERT Award (N00014-94-1-0711), and the National Science Foundation EGB Program (OCE-9523910).
    Keywords: Protozoa ; Water chemistry ; Trace elements in water ; Marine zooplankton ; Chemistry
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
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  • 64
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1895
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 65
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1893
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 66
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1890
    Description: Preface -- Specialization and organization, companion principles of all progress. The most important need of american biology, by C.O. Whitman -- Naturalist's occupation: 1. general survey. 2. a special problem, by C.O. Whitman -- Some problems of Annelid morphology, by E.B. Wilson -- Gastraea theory and its successors, by J.P. McMurrich -- Weismann and Maupas on the origin of death, by Edward G. Gardiner -- Evolution and heredity, by Henry Fairfield Osborn -- Relationships of the sea-spiders, by T.H. Morgon -- On caryokinesis, by S. Watase -- Ear of man: its past, present and future, by Howard Ayers -- Study of Ocean temperatures and currents, by William Libbey, Jr.
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 67
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1894
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 68
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    Marine Biological Laboratory (Woods Hole, Mass.) | Biodiversity Heritage Library
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1899
    Description: Evolution of the sporophyte in the higher plants, by Douglas Houghton Campbell -- Nature of the evidence exhibited by fossil plants, and its bearing upon our knowledge of the history of plant life, by D.P. Penhallow -- Influence of inversions of temperature, ascending and descending currents of air, upon distribution, by D.T. MacDougal -- Significance of mycorrhizas, by D.T. MacDougal -- Instinct, by Edward Thorndike -- Associative processes in animals, by Edward Thorndike -- Behavior of unicellular organisms, by Herbert S. Jennings -- Blind-fishes, by Carl H. Eigenmann -- Some governing factors usually neglected in biological investigations, by Alpheus Hyatt -- On the development of color in moths and butterflies, by Alfred Goldsborough Mayer -- Physiology of secretion, by A. Mathews -- Regeneration: old and new interpretations, by T.H. Morgan -- Nuclear division in protozoa, by Gary N. Calkins -- Significance of the spiral type of cleavage and its relation to the process of differentiation, by C.M. Child -- Aims of the quantitative study of variation, by C.B. Davenport -- On the nature of the process of fertilization, by Jacques Loeb
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
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  • 69
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1896-1897
    Description: Variations and mutations of the introduced sparrow. Passer domesticus, by Hermon C. Bumpus -- Cleavage and differentiation, by E.G. Conklin -- Centrosomes of the fertilized egg of Allolobophora foetida, by Katharine Foot -- Methods of palacontological inquiry, by W.B. Scott -- Physiology of excretion, by Arnold Graf -- Some neural terms, by Burt G. Wilder -- Classification of the North American Taxaccae and Coniferae on the basis of the stem structre, by D.P. Penhallow -- Selection of plant types for the general biology ccourse, by James Ellis Humphrey -- Rate of Cell-division and the function of the centrosome, by A.D. Mead -- Coalescence experiments upon the Lepidoptera, by Henry E. Crampton, Jr. -- Some of the functions and features of a biological station, by C.O. Whitman
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 70
    Publication Date: 2023-01-12
    Description: Biological lectures given at the Marine Biological Laboratory in Woods Hole in the summer of 1898
    Description: Publications
    Keywords: Biology ; Publications
    Repository Name: Woods Hole Open Access Server
    Language: English
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  • 71
    Publication Date: 2012
    Description: Analysen zum Auftreten des Kohlschotenrüßlers in Raps der Vergangenheit und Abschätzungen zum Befall in der Zukunft mit Ensembleläufen verschiedener Klimamodelle KATASTER-BESCHREIBUNG: Beschreibung der Biologie (Überwinterungsdauer, Erstauftreten und Aktivität) der Kohlschotenrüßlers (Ceutorhynchus pallidactylus (Mrsh.)) in Raps in Luxemburg, Auswertung historischer Daten für 1961-90 und Vergleich mit Szenarienzeiträumen (2021-50 bzw. 2069-2098), Bandbreite der Simulationen aus 5 Globalen Klimamodellen (GCM) mit A1B und weiter regionalisiert (25x25km) mit 6 regionalen Klimamodellen KATASTER-DETAIL: Für die Zeit 2090-2099 im Vergleich zu 1980-1999 prognostizieren die GCM bei dem Szenario A1B eine Temperaturzunahme um 2.8 °C (Bandbreite 1.7 bis 4.4 °C) Delta T, dann Auftreten des Kohlschotenrüsslers um 3.3 Tage pro Dekade eher
    Keywords: Großherzogtum Luxemburg ; 1961-90 ; Szenarien ; Klima ; Landwirtschaft ; Pflanzenschädling ; Raps
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  • 72
    Publication Date: 2021-05-19
    Description: Se incluyen en el análisis 271 trabajos publicados en diversas revistas científicas y cuyo material básico de estudio fue observado, colectado y analizado en el Caribe colombiano, pero fundamentalmente en el área de influencia directa del INVEMAR. Las contribuciones han sido publicadas en alemán (111), español (109) e inglés (51). Dichos trabajos incluyen investigaciones de carácter descriptivo (175) y analítico (96) e involucran el ambiente terrestre (91) y el acuático (180). Las regiones incluidas en loa estudios son: Parque Tayrona (84), Santa Marta (59), Ciénaga Grande (51) y otras áreas (77); y en cuanto a las ramas de la ciencias: la Biología (212), la Geología (9) y otras áreas (50).
    Description: Two hundred and seventy one works published in different scientific journals are included and whose basic study material was observed, collected and analized in the Colombian Caribbean, but basically in INVEMAR direct influence área. The contributions have been published in Germán (111), Spanish (109)and English (51). These works include research of descriptive character (175) and analitic (96), and involve land (91) and aquatic (180) environments. The regions included in the studies are the following: Tayrona Park (84), Santa Marta (59), Ciénaga Grande (51), and other arcas (77); and concerning the scientific branches: Biology (212), Geology (9) and other arcas (50).
    Description: Published
    Description: Bibliography,
    Keywords: Estuaries ; Geology ; Coastal lagoons ; Biology ; Coastal lagoons ; Estuaries ; Biology ; Geology
    Repository Name: AquaDocs
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  • 73
    Publication Date: 2021-05-19
    Description: Daily topical application of the aqueous ethanolic extract of the marine sea grass, Thalassia testudinum, on mice skin exposed to UVB radiation resulted in a dose dependent recovery of the skin macroscopic alterations over a 6-day period. Maximal effect (90%) occurred at a dose of 240 μg/cm2, with no additional effects at higher doses. Bioassay-guided fractionation of the plant extract resulted in the isolation of thalassiolin B (1). Topical application of 1 (240 μg/cm2) markedly reduces skin UVB-induced damage. In addition, thalassiolin B scavenged 2,2-diphenyl-2-picrylhydrazyl radical with an EC50=100 μg/ml. These results suggest that thalassiolin B is responsible for the skin regenerating effects of the crude extract of T. testudinum
    Description: Published
    Description: Flavonoids, Thalassiolin B, DPPH scavenged, antioxidant activity, Skin regenerating activity, Thalassia testudinum
    Keywords: Chemistry ; Pharmacology ; Chemistry ; Pharmacology
    Repository Name: AquaDocs
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  • 74
    Publication Date: 2021-05-19
    Description: Bioguided fractionation of Agelas cerebrum crude extract resulted in isolation of four bromopyrrole and four bromopyrrole aminoimidazole alkaloids, identified as 5-bromopyrrole-2-carboxylic acid (1), 4-bromopyrrole-2-carboxylic acid (2), 3,4-bromopyrrole-2-carboxylic acid (3), 4,5-bromopyrrole-2-carboxylic acid (4), oroidin (5), bromoageliferin (6), dibromoageliferin (7) and dibromosceptrin (8) on the basis of spectroscopic data analyses (UV, IR, HRMS, 1D and 2D NMR) and comparison with literature data. This is the first report of compounds 2 and 3 in a marine sponge belonging to the Agelas genus and the first evidence of the presence of 1 from a natural source.
    Description: Published
    Description: Agelas cerebrum, bromopyrrole alkaloids, antitumoral, antiprotozoal activity
    Keywords: Chemistry ; Alkaloids ; Sponges ; Alkaloids ; Sponges ; Chemistry
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  • 75
    Publication Date: 2021-05-19
    Description: During a 3 week study, a total of 55 individuals of the redlip blenny (Ophioblennius atlanticus) were observed for at least two 15-minute periods, and several for ten of such periods. The sizes of their territories were estimated, the color pattern of each specimen an intra and interspecific interactions were recorded. The mean territory size of the redlip blenny in the study area appeared to be greater than that of these blennies studied in Curacao and Barbados by NURSALL (1977), the difference reflecting perhaps different methods of identifying the territories or a lower density of O. atlanticus in the Santa Marta área. Territories did not appear to be as consistently defended at the study area as at Barbados/Curacao and our impression ¡s that individuals holding large territories are less likely to defend their borders. It seems possible that light colored individuals are protected by their coloration from attack by dark colored territory owners. In territorial defense the redlip blennies grabbed each other tighthy by the mouth and struggled in this position repeatedly for about 15 seconds. Interspecific antagonism was common in the present study, the redlip blennics defended their territory frequently against Eupomacentrus dorsopunicans or E. partitus.
    Description: Durante un estudio de tres semanas, un total de 5 i individuos del bií'nido Ojih'toblcnnius atlnniicur. fueron observados por lo menos durante dos períodos de 1 í minutos para cada individuo y en algunos casos hasta por 10 de estos periodos. Se estimó el área de sus respectivos territorios y se tomó notí de los patrones de coloración de cada espécimen y de las relaciones intra e interespecificas de ellos. El tamaño promedio del territorio de estos blénidos resultó ser mayor que el de los respectivos territorios estudiados por NURSALL (1977) en Curacao y Barbados. Esta diferencia posiblemente se debe a un método diferente de definir los territorios o refleja una densidad menor de la población de O. aílanticus en Santa Marta, Los territorios del área fueron defendidos con menor intensidad a como lo fueron los de Barbados/ Curacao y es nuestra impresión que individuos ocupando un territorio extenso tienden a defender sus límites en menor grado. El color claro de algunos individuos probablemente los protege de agresiones por parte de individuos de color oscuro. En el acto de defensa territorial intraespecífica, los blénidos se agarran por sus bocas y se sacuden mutuamente durante aproximadamente 15 segundos , pudiéndose repetir esti varias veces. Con frecuencia se observarondefensas de los territorios dirigidas hacia los peces doncella Eupomacentrus dorsopunicnas y E. partitus.
    Description: Published
    Keywords: Fisheries ; Biology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 76
    Publication Date: 2021-05-19
    Description: Sícydium antillarum Grant es un gobiido abundante en las corrientes que bajan de la SierraNevada de Santa Marta (Colombia) al mar. Se estudió la población de la Quebrada Valencia y las postlarvas en las bocas de los ríos Manzanares y Gaira, entre febrero de 1987 y enero de 1988. Se presentan datos morfológicos, merísticos y morfométricos de la especie; la población desovó de mayo a diciembre, con picos máximos en junio y octubre. La proporción hembras: machos fue casi 1:1 de enero a marzo; de abril a diciembre los machos se apoderan de un territorio y se dificulta su captura, principalmente en septiembre y octubre (proporción 9:1). La fecundidad máxima fue de 91067 huevos en una hembra de 109 mm; el 25% de los ejemplares alcanzó la madurez entre 60.0 y 64.9 mm. La relación talla (mm) - peso (gr) fue: Peso = 1.039x10'6 xlongitud total 35232 . El factor de condición sufre un descenso en noviembre, después del mayor pico de desove de la estación lluviosa. Los contenidos estomacales estaban integrados por algas y bacterias; la especie es diurna, encontrándose el 100% de individuos con el estómago lleno a las 15:00 horas. Las postlarvas fueron detectadas cada mes entre agosto y diciembre, al fin del cuarto menguante; adultos y postlarvas son resistentes a condiciones de laboratorio.
    Description: Sicydium antillarum Grant is an abundant gobiidfish ¡n the streams which runfrom the Sierra Nevada de Santa Marta (Colombia) tothe sea. The population living in the Quebrada Valencia was studiedfrom February 1987 to January 1988; postlarvae were observed and collected at the mouths of the Manzanares and Gaira rivers. Morphological, meristic and morphometric data of the species are presented; the population spawned between May and December, with peaks in June and October. Sex ratios between January and March were around 1:1; males defend a territory from April to December and are more difficult to capture (mainly in September and October, when the ratios are about ninefemales per male). The highest numberof eggs (91,067) was found in a female 109 mm in íength. Twenty-five per cent of the specimens reached maturity between 60.0 and 64.9 mm. The equation relating íength (mm) and weigth (gr) is: Weígth = 1.0309xtO*6 xtotal íength 35232 . Condition factor reached a low valué in November.that is after the highest spawning peak of the rainy season. The stomach contents studied were composed of algae and bacteria; all the specimens collected at 15:00 had a full stomach, which indicates that the species is diurnal. Postlarvae were detected monthly from August top December, always related to the waning moon. Adults and postlarvae are very hardy and live well in laboratory conditions.
    Description: Published
    Keywords: Ecology ; Geographical distribution ; Reproductive behaviour ; Feeding behaviour ; Ichthyology ; Biology ; Ecology ; Ichthyology ; Geographical distribution ; Reproductive behaviour ; Feeding behaviour ; Biology ; Morphometry ; Stomach content
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 77
    Publication Date: 2021-05-19
    Description: Se describen 19 especies de peces colectadas en los archipiélagos coralinos de las islas del Rosario y de San Bernardo, las cuales son nuevos registros para el Caribe continental colombiano. Tres de esas especies (Ichthyapus ophioneus, Calamopteryx goslinei y Apogon leptocaulus) no habían sido colectadas antes en el Caribe sur, por lo que estos récords son nuevos para este sector del Mar de las Antillas. Se incluye información sobre aspectos biológicos y ecológicos de las especies.
    Description: 19 species of fishes coliected in the coralline archipelagos of Islas de) Rosario and San Bernardo, which are reponed for the first time for the Colombian continental Car¡bbean, are described. Three of those species (Ichtyapus ophioncus, Calamopteryx goslmei and Apogon leptocaulus) had not been collected before in the southern Caribbean, being therefore new records for this section of the Sea. Biological and ecological information about the 19 species is given as well.
    Description: Published
    Keywords: Fish ; Ecology ; Biology ; Fish ; New records ; Biology ; Ecology
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 78
    Publication Date: 2011
    Description: Verbreitung des Maiszünslers (Ostrinia nubilalis) und des Kartoffelkäfers (Leptinotarsa decemlineata) in der Vergangenheit in Europa (1961-90) und durch Klimawandel induzierte Veränderung der Verbreitung mit dem CLIMAX-Modell KATASTER-BESCHREIBUNG: Drei globale Klimamodelle (HadCM, NCAR-PCM and ECHAM)mit SRES A1B,, A2, B2 und der damit verbundene mittlere Temperaturanstieg (2.6K, 3.0K, 4.5K) dienten als Input für regionale Klimamodelle (12 climate change scenarios). KATASTER-DETAIL: Delta Tmit 〉4.5K (HadCM-high scenario), dann werden 45% der Landfläche in Europa vom Auftreten einer 3. Generation des Kartoffelkäfers betroffen sein und 61% vom Auftreten einer 2. Generation des Maiszünzlers
    Keywords: Europa ; 1961-90 ; Szenarien ; Insekten ; Kartoffeln ; Mais ; Pflanzenschädling ; Modell
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  • 79
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    Nature Publishing Group (NPG)
    Publication Date: 2011-10-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lehn, Jean-Marie -- England -- Nature. 2011 Oct 12;478(7368):S8-9. doi: 10.1038/478S8a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21993827" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; Exobiology ; Hippocratic Oath ; Knowledge ; Motivation ; *Nobel Prize ; *Research Personnel/ethics/psychology/standards
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 80
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    Nature Publishing Group (NPG)
    Publication Date: 2011-04-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Noorden, Richard -- England -- Nature. 2011 Apr 21;472(7343):270-1. doi: 10.1038/472270a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21512544" target="_blank"〉PubMed〈/a〉
    Keywords: *Accidents ; Chemistry ; *Laboratories ; Occupational Health/*statistics & numerical data ; Research Personnel ; Students ; Universities
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 81
    Publication Date: 2021-05-19
    Description: La velocidad de descomposición de tres fenólicos, el p-hidroxibenzoico, el protocatecúico y el gálico, los cuales se diferencian en el número de grupos OH, fue investigada en el suelo. Con el aumento de grupos OH aumenta también la velocidad de descomposición microbial. El ácido gálico se descompone más rápido que el protocatecúico y este a su vez más rápido que el phidroxibenzoico.
    Description: The rate of decomposition of the three phenolics, p-hydroxybenzoic acid, protocatechuic acid and gallic acid, whose difference is the amount of OH-groups, was investigated in the soil. With the increase in OH-groups increases the rate of microbial decomposition. Gallic acid decomposes faster than protocatecuic acid and this again faster than p-hydroxybenzoic acid.
    Description: Published
    Keywords: Chemical decomposition ; OH Groups ; Microbes ; Phenols ; Chemistry ; Phenols ; Chemistry
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.141-143
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  • 82
    Publication Date: 2021-05-19
    Description: El objetivo de esta tesis es caracterizar las poblaciones naturales de Ulva fasciata en el sector comprendido entre los ríos Quibú y Jaimanitas al oeste de La Habana, típico de costas de emersión del Caribe Occidental, con vistas a su posible explotación. El estudio se realizó entre marzo de 1996 y enero del 2001. Los resultados más importantes permitieron comprobar que la especie U. fasciata no se distribuye de forma similar en todo este sector, en la cobertura algal intervienen de manera decisiva, el tipo de sustrato y la disponibilidad de nutrientes en el medio. Los compuestos del nitrógeno y el fósforo en el agua de mar y las diferencias en la amplitud de variación de los mismos, justifican las diferencias en la morfometría, la biomasa en pie y el estado nutricional (C, N, P) de U. fasciata y evidencia el carácter oportunista de la especie. Estas condiciones ambientales son poco variables en el tiempo, este hecho garantiza la presencia de su población, cada año, en este sector. El desarrollo de la población de U. fasciata, se favorece cuando la temperatura superficial del mar oscila entre 24ºC y 26,5ºC, los niveles de radiación global fluctúan entre 13,4 mj.m-2 y 24 mj.m-2 y acontecen precipitaciones moderadas que no exceden los 190 mm de acumulado mensual. La biomasa en pie decrece considerablemente en el verano, coincidiendo con las altas temperaturas superficiales del mar (29ºC-30ºC) y las precipitaciones intensas (〉190 mm acumulado mensual). Aunque la biomasa por unidad de área fluctúa en el tiempo, su ciclo anual tiene un patrón muy similar en todo el sector. U. fasciata tiene un contenido alto de clorofila a y b, carotenoides, proteína, carbohidratos, fibra y cenizas, así como de otros macronutrientes (Ca, Mg y K) y micronutrientes (Fe, Zn, Cr y Mn). La concentración de estos componentes manifiesta variaciones espaciales y temporales de acuerdo a los diferentes niveles de nutrifización del medio. Las concentraciones máximas de componentes en los talos coinciden con las mayores acumulaciones de biomasa en pie y acontecen en las zonas cercanas a los ríos. Esta especie posee bajo contenido de lípidos. Existen niveles altos de bacterias coliformes totales y fecales en U. fasciata, por lo que su calidad higiénico-sanitaria no siempre es buena y debe ser tratada si se desea explotar este recurso para diferentes fines.
    Description: Ulva fasciata, explotación
    Keywords: Algae ; Biology ; Algae ; Biology
    Repository Name: AquaDocs
    Type: Theses and Dissertations
    Format: 150pp.
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  • 83
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    In:  C. R. Biologies 333 (2010) 497–503
    Publication Date: 2010
    Description: Auswirkungung erhöhter Temperatur, ansteigender CO2-und O3-Konzentrationen, Biodervisität der Läusepolulationen Interaktionen zur Umwelt, Ergebnisse des EXAMINE-Projektes sind zusammenfassend dargestellt KATASTER-BESCHREIBUNG: Ergebnisse des EYAMINE-Projektes, Auswertung von 58 Standorten KATASTER-DETAIL: Delta T (〉1°K), ansteigende Biodervisität und Zunahme der Läusearten (2-15) in Prestan (UK) und Rennes (F) von 1976-2003 Dleta T (Temperatur im Janur und Februar 〉 1.3k gegenüber 3.3K in 1960), Auftreten der Grünen Pfirsichblattlaus (Myces persicae) als wichtigster Vektor etwa 3 Wochen eher
    Keywords: Europa ; 1970-2006, Szenarien ; Insekten ; Pflanzenschädling ; Temperatur ; Vegetationsperiode
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  • 84
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    In:  Münster: proPlant GmbH. http://www.proplant.de/data/2010/ 2010_12_Volk-Richthofen-Johnen_Abschlussbericht- Klimawandel-und-Pflanzenschutz_proPlant.pdf
    Publication Date: 2010
    Description: Infektionsrisiko für pilzliche, bakterielle und tierische Schädlinge bei Weizen, Winterraps, Kartoffeln, Zuckerrüben und Mais werden für das Szenario A1B abgeschätzt KATASTER-BESCHREIBUNG: Schwerpunkt auf den 8 bedeutensten Krankheiten bei Weizen, Halmbruch, Mehltau, Septoria-Blattdürre, Gelbrost, Braunrost, DTR-Blattdürre, Septoria nodorum und Fusarium, Simulationen mit proPlant.expert und Einteilung in Trendklassen (1-5) von linearer Trend ansteigend (=1) bis abnehmend (=5) KATASTER-DETAIL: Tmit+ (Wettreg 2006, A1B), dann ansteigendes Risiko für Septoria tritici, Braunrost, Mehltau, Fusarium, für Halmbruch und DTR kein ansteigendes Risiko ermittelt Detaillierte Trendübersicht und Beurteilung für einzelne Kulturen und Regionen in NRW siehe Dokument, Anhang
    Keywords: Nordrhein-Westfalen ; 2001-2050 ; Insekten ; Zuckerrüben ; Kartoffeln ; Infektionskrankheiten ; Landwirtschaft ; Mais ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Temperatur ; Weizen ; Raps ; Modell
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  • 85
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    Nature Publishing Group (NPG)
    Publication Date: 2010-09-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lok, Corie -- England -- Nature. 2010 Sep 2;467(7311):18-21. doi: 10.1038/467018a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20811430" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; Financing, Government/legislation & jurisprudence ; Nanostructures/chemistry ; *Nanotechnology/economics ; *Research Support as Topic
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 86
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    Nature Publishing Group (NPG)
    Publication Date: 2010-10-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Agre, Peter -- England -- Nature. 2010 Oct 14;467(7317):S11. doi: 10.1038/467S11a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20944611" target="_blank"〉PubMed〈/a〉
    Keywords: Aquaporins/metabolism ; Chemistry ; Happiness ; Interdisciplinary Communication ; Mentors ; Neurosciences/trends ; *Nobel Prize ; Peer Review, Research ; Politics ; Public Policy ; Research/standards/trends ; *Research Personnel/psychology/standards
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 87
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    Nature Publishing Group (NPG)
    Publication Date: 2010-10-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crutzen, Paul J -- England -- Nature. 2010 Oct 14;467(7317):S10. doi: 10.1038/467S10a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20944610" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Chemistry ; Human Activities ; Interdisciplinary Communication ; Mentors ; *Nobel Prize ; Ozone/analysis ; Politics ; Public Opinion ; Public Policy ; *Research Personnel
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 88
    Publication Date: 2010-02-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, Edward O -- New York, N.Y. -- Science. 2010 Feb 12;327(5967):775. doi: 10.1126/science.327.5967.775.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20150461" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Ants ; Biology ; *Ecosystem ; *Literature, Modern
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 89
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    Nature Publishing Group (NPG)
    Publication Date: 2010-10-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kroto, Harold W -- England -- Nature. 2010 Oct 14;467(7317):S13. doi: 10.1038/467S13a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20944613" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; Conservation of Energy Resources/methods ; Freedom ; Interdisciplinary Communication ; *Nobel Prize ; Nuclear Fission ; Peer Review, Research ; Private Sector/economics ; Public Opinion ; Research/economics/education ; *Research Personnel/economics/education ; Research Support as Topic/economics/methods
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 90
    Publication Date: 2010-03-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jocelyn -- Regalado, Antonio -- New York, N.Y. -- Science. 2010 Mar 12;327(5971):1308-9. doi: 10.1126/science.327.5971.1308.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20223953" target="_blank"〉PubMed〈/a〉
    Keywords: Biology ; Biotechnology ; Chile ; *Disasters ; *Earthquakes ; Laboratories ; *Research ; Universities
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 91
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 8 (1969) 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 92
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 21-27 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An increase in temperature causes an increase in the amplitudes of intramolecular and intermolecular motions and mainfests itself as an increase in the effective radii of the various atoms, especially hydrogen atoms. If one uses a Lennard-Jones 6-12 potential function to account for nonbonded interactions, this increase in the radius of the hydrogen atom is equivalent to a modification of the coefficient of the repulsive part of the Lennard-Jones potential. Accordingly, this effect of increasing temperature on the helix sense of several polyamino acids is computed by allowing the effective radius of the hydrogen atom to increase. It is found that the preferred sense of several polyamino acid helices changes from right- to left-handed as the temperature is increased. This accounts for recent experimental observations of changes in helix sense with temperature.
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  • 93
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 57-68 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Potentiometric titrations and some complementary optical rotation data are presented for solutions of poly(L- glutamic acid) (PGA) in several H2O-ethanol mixtures. The data allow the determination of the intrinsic pK (pK0), slope of the apparent. pK (pKapp), versus degree of ionization curves and of the enthalpy of ionization as a function of ethanol concentration. The variation of the degree of ionization at which the helix-coil transformation occurs with ethanol and temperature is also determined. Finally free energy, enthalpy, and intropy changes associated with the helix-coil transformation for the uncharged conformers are determined from the titration curves. The effect of the ethanol is to increase the stability of the helical conformation of PGA for both the charged and the uncharged forms of the polymer. The stabilization of the uncharged helix is essentially an entropic effect.
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  • 94
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 91-99 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Infrared spectra of polypeptides were measured in the region of 1800-400 cm-1. For the α-helical form, disordered form, and antiparallel-chain β-form, amide V band- arising from N-H out-of-plane bending models were observed at 610-620, around 650, and 700-705 cm-1, respectively, and amide V′ bands arising from N-D out-of-plane bending modes were observed at 455-465, around 510, and a 515-530 cm-1, respectively. These correlations are useful for conformation diagnoses, particularly for copolyamino-acids or proteins which are not oriented. The nature of low-frequency amide bands are discussed with reference to potential energy distributions calculated for the α-helical form and β form.
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  • 95
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some experimental data are given on the infrared spectra between 3300 and 3500 cm-1 of dilute solutions in carbon tetrachloride of three types of model compounds: CH3-CONH-CH(R1)-CONH(R2), (I); CH3-CON(CH3)-CH(R1)-CONH(R2), (II) and CH3-CONH-CH(R1)-CON(R2)2, (III). In studying the N-H stretching bands, it was found that there are two types of intramolecular hydrogen bonds in these molecules; these result in two different cyclized conformations, C5 and C7, which contain respectively, five and seven atoms in the ring. By using model substances I, II, and III, in which the nitrogen atoms are unequally substituted, it is possible to identify the N-H stretching bands which are to be ascribed to the N-H oscillators included in the two different chelated conformations. It is found also that the stretching frequency of a free N-H oscillator depends upon the substituent on the nitrogen atom. Thus, it is possible to observe, with some of the model compounds I, four different absorption bands located at 3340, 3420, 3440, and 3460 cm-1. The first two are ascribed to the N-H oscillators included in the H—bonds which lock the C7 and C5 conformations; the last two correspond to free N-H which differ with the substituent on the nitrogen atom.
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  • 96
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 153-155 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 97
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 207-213 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Molecular orbital calculations of the extended Hückel type have been used to study the conformations of glycyl and alanyl residues in ground and excited states. The ground-state surfaces show features similar to those obtained with the standard calculational methods in which the total energy is partitioned into components such as torsions, nonbonded and electrostatic interactions. The molecular orbital calculations provide the first independent theoretical check on such calculations. The excited-state surfaces, Uniquely available from the molecular orbital calculations, exhibit a better definition and sharpening of potential minima in the sterically allowed regions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 98
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We derive equations for calculating the number-, weight-, and z-average lengths between single-strand breaks in DNA molecules. Provision is made for the existence of preformed breaks under genetic control: these are assumed to be fixed in number in each molecule, but may be variable in position. Breaks due to random degradation may be superimposed on the pre-existing breaks. An example is given for illustrative purposes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 99
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 223-239 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The conformation in solution of fractionated 30 S and 19 S ribosomal RNA from rabbit reticulocytes has been studied by optical rotatory dispersion, analysis of thermal melting profiles and their derivatives, and spectrophotometric acid-base titration. From a consideration of the limitations of these methods, it has been possible to set limiting values on the degree of base-pairing and the lengths of the double helices: between 60 and 80% of the bases in 19 S and 30 S RNA are estimated to be paired. The paired segments are not shorter than 4 base pairs, and evidence from other sources is available which indicates that they are not longer than 8-16 base pairs. The spread of helix lengths is greater in the 30 S than in 19 S RNA; and other differences are noted. Several distinct populations of double helices, differing in their thermal stability, are present. Estimates are presented from spectrophotometric and titration data for the base compositions of the paired and unpaired regions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 100
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 251-263 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A small perturbation analysis is carried out to determine the stability of a fluid containing two layers of diffusing solutes in a common solvent and acted upon by a uniform gravitational field. It is found that instability can arise even though the unperturbed diffusion does not lead to the formation of a density inversion within the fluid.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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