238 research outputs found
The Swedish Public Lending Right PLR
No full texterspective [80][upps-01.gif] This is a thesis on the Swedish Public Lending Right PLR, from a historical perspective. Some of the questions which are investigated in this thesis are: why did the State decide to introduce a PLR and why did it take about 20 years to make the decision? The question why the PLR was not introduced on a copyright basis is also discussed. The focus of this study is during the period of 1934-1956 and it is a literature-study. Mainly there are four reports made by different committees that have been examined. The answer to why it took about 20 years was that the question of a PLR was complicated since it involved two different political areas: the cultural and the legal. The explanation to why a PLR was introduced was because the State could afford it. It was also introduced because the arguments proclaimed by the Swedish Author Association, {Sveriges Författareförening, of how the libraries had a damaging effect of the authors finances, also became the opinion of the State. The Swedish government never took the alternative, to let the borrowers pay for the PLR, into consideration. No legal adjustment in the copyright law took place though. That was probably because it would lead to difficulties, since the government wanted to make a difference between which author that should receive a PLR or not. Chiefly the State wanted to support Swedish authors who wrote fiction.Uppsatsnivå:
Modification of a photosynthetic light-response (PLR) model for modeling the vertical gradient in the response of crown PLR curves
No full textThe photosynthetic light-response (PLR) curve is a mathematical description of a single biochemical process that has been widely applied in many ecophysiological models. For trees, the heterogeneity of PLR curves within the crown is significant but rarely modeled by mathematical techniques. This paper establishes a modified model for estimating crown PLR curves based on PLR functions by linking the parameters of the PLR functions to leaf nitrogen (N), specific leaf area (SLA) and relative depth into the crown (RDINC). The modified models were assessed by considering the goodness of fit (adjusted coefficient of determination, Ra2; root mean square error, RMSE; and Akaike information criterion, AIC) and model structure. Significant correlations were observed between the parameters of PLR functions and N, SLA and RDINC. The optimal modified PLR model, by linking RDINC into a modified Mitscherlich function, fit well due to its simple and easily understood structure. Therefore, it is feasible to simultaneously estimate the multilayered and varied PLR curves of the tree crown.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
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Assessment of the use of CAL to replace remedial biochemical calculation tutorials
No full textA number of students at the early stages of our courses have problems with the correct use of units and basic concentration calculations. These problems are easily addressed by remedial tutorials. A PC Computer Assisted Learning (PCCAL) package from Bath University (UK) on "Basic calculations" was loaded onto the Erasmus Darwin network. The programs were used initially with a small group of second year part-time Bachelor of Science Biomedical students (11 students) to assess if the package could replace previously used remedial tutorial time. The part-time students received one introductory tutorial on how to access the programs and their content. In addition, they also undertook a short pre-program test. For the following three weeks the students used the PCCAL program in the Erasmus Darwin computer resource room (ED290) in place of the remedial tutorial. At the end of the tutorial sessions the students were again subjected to a short post-program test and a verbal feedback session. All the students showed an improved score on the test taken after using the computer programs. In the verbal feed back session the students enjoyed the fact that they could work at their own pace on the packages and that the material got progressively harder. It was decided to test the programs' effectiveness with a larger group of students and to link the assessment of the packages to a pre- and post-computer session multiple-choice question (MCQ) test
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The mobilization of storage proteins in germinating Vicia faba
No full textProteolysis in germinating Vicia faba has been investigated in two ways. Firstly, by isolating and characterising two protease enzymes and secondly, by examining the reserve proteins present in seeds at different times during germination.
One of the enzymes was a proteinase with an apparent molecular weight of 12,000 daltons, the other an aminopeptidase with a molecular weight of 50,000 daltons, both molecular weights estimated by gel filtration. The enzymes were inhibited by N-ethylmaleimide, iodoacetamide and p-chloromercuri- benzene sulphonic acid, whilst their activity was stimulated by reducing agents, indicating the presence of a thiol group at their active sites. The proteinase had a pH optima of 5.4 and was active on the storage proteins legumin and vicilin isolated from days O, 4, 7 and 11 germinated seeds, as well as the nitrophenol esters of asparagine and glycine. The peptidase had a pH optima of 7.4 and showed no activity on the storage proteins legumin and vicilin, but was active on a variety of di- and tri-peptides, prefering glycine as the N-terminal residue next to a hydrophobic amino acid containing an aromatic residue. Antibodies raised to the peptidase in rabbits were used to show that there is an antigenically similar enzyme in cotyledons of Pisum sativum, Vigna radiata, Phaseolusvulgaris and another variety of Vicia faba. Green Windsor, but not in cereal seeds.
Legumin and vicilin were isolated from seeds at various stages of germination and checked for purity by Zonal isoelectric precipitation electrophoresis, a method developed during this study. Using PAGE, SDS-PAGE and lEF in dissociating and reducing conditions, the storage proteins were shown to alter in composition as germination proceeded. Larger subunits disappeared whilst smaller subunits accumulated. These changes were more apparent in vicilin than legumin
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The use of Information and Communication Technology (ICT) in molecular science student centred learning: a developmental approach
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Transglutaminase treatment of wool fabrics leads to resistance to detergent damage
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