28 research outputs found
The diversity of odonata and their endophytic ovipositions from the upper oligocene fossillagerstÀtte of rott (Rhineland, Germany)
A commented list of fossil Odonata from the Oligocene outcrop of Rott is given, together with descriptions of new traces of oviposition in plant tissues, very similar to ichnotaxa already known from the early Eocene Laguna del Hunco floras of Patagonia. The joint presences of odonatan larvae and traces of oviposition demonstrate the autochthony of these insects in the palaeolake of Rott, confirming the existence of a diverse and abundant aquatic entomofauna, a situation strikingly different to that in the contemporaneous Oligocene palaeolake of CĂ©reste (France).Fil: Petrulevicius, Julian Fernando. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. DivisiĂłn PaleozoologĂa Invertebrados; ArgentinaFil: Wappler, Torsten. Universitat Bonn; AlemaniaFil: Nel, AndrĂ©. MusĂ©um National d'Histoire Naturelle; FranciaFil: Rust, Jes. Universitat Bonn; Alemani
RelatĂłrio de estĂĄgio em farmĂĄcia comunitĂĄria
RelatĂłrio de estĂĄgio realizado no Ăąmbito do Mestrado Integrado em CiĂȘncias FarmacĂȘuticas, apresentado Ă Faculdade de FarmĂĄcia da Universidade de Coimbr
SynthÚse et caractérisations structurales et magnétiques de quelques nouveaux oxydes mixtes des métaux de transition
No abstractPas de résum
True flies (Insecta: Diptera) from the late Eocene insect limestone (Bembridge Marls) of the Isle of Wight, England, UK
The Diptera fauna from the late Eocene of the Isle of Wight (Bembridge Marls) is studied including redescriptions of formerly described material. The fauna includes the following taxa: Anisopodidae â one species; Bibionidae â 11 species; Ceratopogonidae â one described and two unidentified species; Chironomidae â undetermined species of three subfamilies; Culicidae â four species; Cylindrotomidae â one species; Dixidae â one species; Keroplatidae â one described and four unidentified species; Limoniidae â 31 species; Mycetophilidae â 14 species; Psychodidae â two species; Scatopsidae â two species; Sciaridae â three species; Simuliidae â an unnamed species; Tipulidae â nine species. Diptera Brachycera: Agromyzidae â unidentified species; Anthomyzidae â two species; Asilidae â two species; Bombyliidae â one species; Chloropidae â one species; Dolichopodidae â unidentified species; Empididae â unidentified species; Ephydridae â two species; Heleomyzidae â unidentified species; Lauxaniidae â unidentified species; Otitidae â one species; Phoridae â unidentified species; Rhagionidae â two species; Stratiomyidae â two species; Syrphidae â unidentified species; Tabanidae â one species. Following new taxa are described: Leptotarsus (Longurio) fragmentatus KrzemiĆski, n. sp., Leptotarsus (Longurio) wegiereki KrzemiĆski, n. sp., Tipula (s. lato) anglicana KrzemiĆski, n. sp. (Tipulidae); Cyttaromyia rossi KrzemiĆski, n. sp. (Cylindrotomidae); Gurnardia corami KrzemiĆski, n. gen, n. sp., Pilaria hooleyi KrzemiĆski, n. sp., Pilaria volodii KrzemiĆski, n. sp., Cheilotrichia (Cheilotrichia) duplicata KrzemiĆski, n. sp., Cheilotrichia (Empeda) szwedoi KrzemiĆski, n. sp., Symplecta (Psiloconopa) gurnetensis KrzemiĆski, n. sp., Orimarga (Orimarga) lenae KrzemiĆski, n. sp., Dicranomyia (Dicranomyia) azari KrzemiĆski, n. sp., Dicranomyia (Dicranomyia) fasciata KrzemiĆski, n. sp., Helius (Helius) edmundi KrzemiĆski, n. sp., Helius (Helius) popovi KrzemiĆski, n. sp., Dicranoptycha staryi KrzemiĆski, n. sp. (Limoniidae); Wightipsychoda Azar, n. gen. (Psychodidae); Dilophus andrewrossi Nel, Colomb & Waller, n. sp., Bibiodes massiliensis Nel, Colomb & Waller, n. sp. (Bibionidae); Azana cockerelli Blagoderov, n. sp., Aglaomyia vectis Blagoderov, n. sp., Dziedzickia oligocenica Blagoderov, n. sp., Palaeoempalia saxea Blagoderov, n. sp., Mycomya hoolei Blagoderov, n. sp., Leia gurnardensis Blagoderov, n. sp. (Mycetophilidae); Regmoclemina haennii KrzemiĆski, n. sp. (Scatopsidae); Sylvicola problematica KrzemiĆski, n. sp. (Anisopodidae); Palaeoberidops barkeri Nicholson, n. gen., n. sp. (Stratiomyidae). The Diptera fauna and palaeohabitat of the Insect Bed is discussed
True flies (Insecta: Diptera) from the late Eocene insect limestone (Bembridge Marls) of the Isle of Wight, England, UK
The Diptera fauna from the late Eocene of the Isle of Wight (Bembridge Marls) is studied including redescriptions of formerly described material. The fauna includes the following taxa: Anisopodidae ĂąâŹâ one species; Bibionidae ĂąâŹâ 11 species; Ceratopogonidae ĂąâŹâ one described and two unidentified species; Chironomidae ĂąâŹâ undetermined species of three subfamilies; Culicidae ĂąâŹâ four species; Cylindrotomidae ĂąâŹâ one species; Dixidae ĂąâŹâ one species; Keroplatidae ĂąâŹâ one described and four unidentified species; Limoniidae ĂąâŹâ 31 species; Mycetophilidae ĂąâŹâ 14 species; Psychodidae ĂąâŹâ two species; Scatopsidae ĂąâŹâ two species; Sciaridae ĂąâŹâ three species; Simuliidae ĂąâŹâ an unnamed species; Tipulidae ĂąâŹâ nine species. Diptera Brachycera: Agromyzidae ĂąâŹâ unidentified species; Anthomyzidae ĂąâŹâ two species; Asilidae ĂąâŹâ two species; Bombyliidae ĂąâŹâ one species; Chloropidae ĂąâŹâ one species; Dolichopodidae ĂąâŹâ unidentified species; Empididae ĂąâŹâ unidentified species; Ephydridae ĂąâŹâ two species; Heleomyzidae ĂąâŹâ unidentified species; Lauxaniidae ĂąâŹâ unidentified species; Otitidae ĂąâŹâ one species; Phoridae ĂąâŹâ unidentified species; Rhagionidae ĂąâŹâ two species; Stratiomyidae ĂąâŹâ two species; Syrphidae ĂąâŹâ unidentified species; Tabanidae ĂąâŹâ one species. Following new taxa are described: Leptotarsus (Longurio) fragmentatus KrzemiĂ
âski, n. sp., Leptotarsus (Longurio) wegiereki KrzemiĂ
âski, n. sp., Tipula (s. lato) anglicana KrzemiĂ
âski, n. sp. (Tipulidae); Cyttaromyia rossi KrzemiĂ
âski, n. sp. (Cylindrotomidae); Gurnardia corami KrzemiĂ
âski, n. gen, n. sp., Pilaria hooleyi KrzemiĂ
âski, n. sp., Pilaria volodii KrzemiĂ
âski, n. sp., Cheilotrichia (Cheilotrichia) duplicata KrzemiĂ
âski, n. sp., Cheilotrichia (Empeda) szwedoi KrzemiĂ
âski, n. sp., Symplecta (Psiloconopa) gurnetensis KrzemiĂ
âski, n. sp., Orimarga (Orimarga) lenae KrzemiĂ
âski, n. sp., Dicranomyia (Dicranomyia) azari KrzemiĂ
âski, n. sp., Dicranomyia (Dicranomyia) fasciata KrzemiĂ
âski, n. sp., Helius (Helius) edmundi KrzemiĂ
âski, n. sp., Helius (Helius) popovi KrzemiĂ
âski, n. sp., Dicranoptycha staryi KrzemiĂ
âski, n. sp. (Limoniidae); Wightipsychoda Azar, n. gen. (Psychodidae); Dilophus andrewrossi Nel, Colomb & Waller, n. sp., Bibiodes massiliensis Nel, Colomb & Waller, n. sp. (Bibionidae); Azana cockerelli Blagoderov, n. sp., Aglaomyia vectis Blagoderov, n. sp., Dziedzickia oligocenica Blagoderov, n. sp., Palaeoempalia saxea Blagoderov, n. sp., Mycomya hoolei Blagoderov, n. sp., Leia gurnardensis Blagoderov, n. sp. (Mycetophilidae); Regmoclemina haennii KrzemiĂ
âski, n. sp. (Scatopsidae); Sylvicola problematica KrzemiĂ
âski, n. sp. (Anisopodidae); Palaeoberidops barkeri Nicholson, n. gen., n. sp. (Stratiomyidae). The Diptera fauna and palaeohabitat of the Insect Bed is discussed
A cobalt oxideâpolypyrrole nanocomposite as an efficient and stable electrode material for electrocatalytic water oxidation
International audienceDeveloping electrolyzers operating under neutral or near-neutral conditions with catalysts based only on earth-abundant metals is highly desirable with a view to reduce the cost of hydrogen production from water splitting reaction and avoid the environmental issues related to corrosion usually encountered with alkaline electrolyzers. Herein, we report a highly active and stable anode material for oxygen evolving reaction (OER) in mild-pH conditions based on cobalt oxide-nanoparticles embedded into a poly(pyrrole-alkylammonium) matrix (denoted PPN+-CoOx). Examples of hybrid materials combining metal oxide nanoparticles as OER catalysts within a polymer film are still rare. However, they are very promising to control the formation and the size of metal particles in view to enhance the electrochemically active surface area and thus the electrocatalytic performances. Our strategy consists in electroprecipitating Co0 nanoparticles by reduction of an anionic cobalt oxalate complex into the cationic PPN+ film, the latter being previously deposited onto an electrode surface by electropolymerization. The Co0 nanoparticles within the composite are then partially in-situ oxidized under air exposure into CoO, and then finally fully oxidized into CoOx by successive scans between 0 and 1.2 V vs Ag/AgCl in a borate buffer at pH 9.2. This nanocomposite material is highly structured with around 30 nm-large CoOx nanoparticles well dispersed into the polypyrrole film conferring a high OER electrocatalytic activity at near neutral pH of 9.2 with exceptional values of mass activity and turnover frequency of 3.01 A mg-1 and 0.46 s-1 respectively, at an overpotential of 0.61 V and with a cobalt loading of 1.34 ”g cm-2. These performances place the PPN+-CoOx electrode among the most active anodes described in the literature employing cobalt oxide under mild pH conditions. In addition, when the PPN+-CoOx material is electrodeposited on carbon paper with a higher roughness than a simple carbon electrode, the physisorption of the film on the electrode is considerably enhanced resulting in a stable catalytic current over more than 43 h. Post electrolysis characterizations by SEM and EDX confirm the integrity of the PPN+-CoOx material after long hours of electrocatalysis. This demonstrates the beneficial role of the polypyrrole matrix in the achievement of very stable and highly active anodes for water oxidation