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- Carlsson, Gunilla, 1962-, et al.
(författare)
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Studentcentrerad examination av laborativt arbete
- 2018
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Ingår i: Studentaktiva lärande- och examinationsformer. - Karlstad : Karlstads universitet. - 9789170639647 - 9789170638695 ; , s. 35-48
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Kurser inom teknik- och naturvetenskap innehåller traditionellt en eller flera laborationer. Laborationernas syfte måste på ett tydligt sätt kommuniceras till studenterna. Det är också viktigt att det finne en synlig koppling mellan kursens lärandemål och laborationerna.För att få svar på hur studenterna upplever laborationernas syfte och mål i kemikurser, samt hur laborationerna kan bidra till studenternas lärande, har studenter besvarat enkäter och deltagit i samtal. Blan annat framkom att när studenterna fick samtala om sina beräkningar och resultat kunde de i diskussionen bekräfta sin kunskap. Många menade att också att diskussionerna bidrog till lärande.Det är viktigt att universitetslärare sätter studenternas lärande i centrum. Om vi kan förstå hur olika undervisnings- och examinationsformer bidrar till studenternas lärande får vi möjlighet att designa våra kurser på bästa sätt.
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- Carlsson, Gunilla, 1962-, et al.
(författare)
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Studentcentrerad examination av laborativt arbete i kemi
- 2018
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Ingår i: Bidrag från 6:e Utvecklingskonferensen för Sveriges ingenjörsutbildningar. - Göteborg, Sverige. - 9789188041111 ; , s. 126-129-
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Konferensbidrag (refereegranskat)abstract
- Kurser inom teknik- och naturvetenskap innehåller av tradition ofta en eller flera laborationer. När en universitetslärare designar en kurs finns ett tydligt syfte med varje laboration och koppling till lärandemål. Men hur upplever studenterna laborationernas syfte och mål i våra kurser och hur kan de bidra till studenternas lärande? För att få svar har studenter svarat på enkäter och deltagit i samtal om hur laborationer bidrar till deras lärande på kurser. Från enkäter och samtal framkom att när studenterna fick samtala om sina beräkningar och resultat kunde de i diskussionen bekräfta sin kunskap. Många menade också att diskussionerna bidrog till inlärning. Ett annat sätt som visade sig bidra till ökat lärande var när studenterna rättade varandras protokoll.
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- Nilsson, Thomas, 1955-, et al.
(författare)
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Microbial metabolism of oxochlorates : A bioenergetic perspective
- 2013
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Ingår i: Biochimica et Biophysica Acta - Bioenergetics. - : Elsevier. - 0005-2728 .- 1879-2650. ; 1827:2, s. 189-197
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Forskningsöversikt (refereegranskat)abstract
- The microbial metabolism of oxochlorates is part of the biogeochemical cycle of chlorine. Organisms capable of growth using perchlorate or chlorate as respiratory electron acceptors are also interesting for applications in biotreatment of oxochlorate-containing effluents or bioremediation of contaminated areas. In this review, we discuss the reactions of oxochlorate respiration, the corresponding enzymes, and the relation to respiratory electron transport that can contribute to a proton gradient across the cell membrane. Enzymes specific for oxochlorate respiration are oxochlorate reductases and chlorite dismutase. The former belong to DMSO reductase family of molybdenum-containing enzymes. The heme protein chlorite dismutase, which decomposes chlorite into chloride and molecular oxygen, is only distantly related to other proteins with known functions. Pathways for electron transport may be different in perchlorate and chlorate reducers, but appear in both cases to be similar to pathways found in other respiratory systems.
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- Smedja Bäcklund, Anna, 1963-
(författare)
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c Cytochromes as Electron Carriers in Microbial Chlorate Respiration
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Microbial respiration of oxochlorates is important for the biotreatment of effluents from industries where oxochlorates are produced or handled. Several bacterial species are capable to use perchlorate and/or chlorate as an alternative electron acceptor in absence of oxygen. The present study deals with the electron transport from the membrane-bound components to the periplasmic chlorate reductase, in the gram-negative bacterium Ideonella dechloratans. Both chlorate reductase and the terminal oxidase of I. dechloratans were found to utilize soluble c cytochromes as electron donors. For further investigation, two major heme-containing components were purified and characterized. The most abundant was a 9 kDa c-type cytochrome (class I), denoted cytochrome c-Id1. This protein was shown to serve as electron donor for both chlorate reductase, and for a terminal oxidase. The other major component was a 55 kDa homotetrameric cytochrome c', (class II). A function for this cytochrome could not be demonstrated but it does not appear to serve as electron donor to chlorate reductase. A gene predicted to encode a soluble c cytochrome was found in close proximity to the gene cluster for chlorate reduction. The predicted sequence did not match any of the cytochromes discussed above. The gene was cloned and expressed heterologously, and the resulting protein was investigated as a candidate electron donor for chlorate reductase. Electron transfer from this protein could not be demonstrated, suggesting that the gene product does not serve as immediate electron donor for chlorate reductase.
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- Smedja Bäcklund, Anna, 1963-
(författare)
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Electron transport in microbial chlorate respiration
- 2009
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Several bacterial species are capable to use perchlorate and/or chlorate as an alternative electron acceptor in absence of oxygen. Microbial respiration of oxochlorates is important for biotreatment of effluent from industries where oxochlorates are produced or handled. One of these species, the Gram-negative Ideonella dechloratans, is able to reduce chlorate but not perchlorate. Two soluble enzymes, chlorate reductase and chlorite dismutase, participate in the conversion of chlorate into chloride and molecular oxygen. The present study deals with the electron transport from the membrane-bound components to the periplasmic chlorate reductase. Soluble c cytochromes were investigated for their ability to serve as electron donors to chlorate reductase. The results show that a 6 kDa c cytochrome serves as electron donor for chlorate reductase. This cytochrome also serves as electron donor for a terminal oxidase in the reduction of oxygen that is produced in the course of chlorate respiration. A gene encoding a soluble c cytochrome was found in close proximity to the gene cluster for chlorate reduction. This gene was cloned and expressed heterologously, and the resulting protein was investigated as a candidate electron donor for chlorate reductase. Electron transfer from this protein could not be demonstrated, suggesting that the gene product does not serve as immediate electron donor for chlorate reductase.
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