| 1. |
- Andersson, Annica
(author)
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Ethnomathematics - A Way to Achieve Goals in Mathematic Education?
- 2008
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Conference paper (other academic/artistic)abstract
- ETHNOMATHEMATICS: A WAY TO ACHIEVE GOALS IN MATHEMATIC EDUCATION? Annica Andersson School of Teachers Education, Malmö University. In the Swedish curriculum for the upper secondary social science programs mathematical education is a paragraph stating “the students shall deepen their insight into how mathematics has been influenced by people from many different cultures, and how mathematics has developed and still continues to develop” (Skolverket, 2000). How do we achieve this goal in mathematics education? I asked myself if ethnomathematics, defined by D’Ambrosio (1985) as the mathematics you find in different identified culture groups e.g. aboriginal peoples mathematics, and Bishops (1991) and Bartons (1996) definitions of the ethnomathematic phenomena could be a way to achieve the described goal. The study reported (Andersson,in p.) is placed in the field of action research. The 16 participating students were in year two in an international social science program. The teaching sequence reported contains of two parts. The first part was an introduction to ethnomathematics and discussions about indigenous people and global issues. The second part took place at the exhibition “Dreamtime, Aboriginal Art from the Ebes Collection”. The students got the opportunity to analyse the Australian aboriginals’ maps as art. It was my intension to show the students examples of ethnomathematics and thereby other expressions of mathematics than they were used to. The students reflected over the question: What kind of mathematics do you think lay behind the different works of art? The students counted for geometry, functions and arithmetical progressions. Some students chose to discus what mathematics and mathematical post constructions in art is. None of the students accounted for answers similar to the problems in their textbooks (e.g. How much did it cost to make the picture?)After the teaching sequence I came to the conclusion that ethnomathematics can be a way to achieve the above described goal and maybe also a way to bring global issues into the mathematical classroom. My personal experience of the teaching sequence was students more interested in mathematics education and more engaged in the classroom than usual. It would be a challenge in the future to investigate if and how students’ motivation and results in mathematics education can be affected by using ethnomathematics as a discourse. REFERENCES Andersson, Annica (in press). A Cultural Visit in Mathematics Education. In proceedings from MACAS 2 – The Second International Symposium of Mathematics and its Connections to the Arts and Sciences. Odense, Denmark Barton, Bill (1996). Anthropological Perspectives on Mathematics and Mathematics Education. In A.J. Bishop, International Handbook of Mathematics Education (pp.1035-1054). Dordrecht: Kluwer Academic Publishers. Bishop, Alan J (1991). Mathematical Enculturation. A cultural perspective on Mathematics education. Dordrecht: Kluwer Academic Publishers. D’Ambrosio, Ubiritan (1985). Socio-cultural bases for Mathematics Education. Unicamp, Campinas, Brazil.
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| 2. |
- Andersson, Annica, et al.
(author)
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Mathematics education giving meaning to Social Science students : A case from Sweden
- 2009
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Conference paper (peer-reviewed)abstract
- Compulsory mathematics for social science students is problematic. We discuss the case of a group of students in Sweden who met a mathematics course inspired on the ideas of critical mathematics education and ethnomathematics. The evidence collected about students’ experiences on this course indicate that opening a space for agency and linking mathematics to their foregrounds can be the basis for a more meaningful mathematical experience. Such as experience has the potential of contributing to the process of students’ subjectification.
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| 3. |
- Andersson, Malin E, 1978, et al.
(author)
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Kinesin gene variability may affect tau phosphorylation in early Alzheimer's disease.
- 2007
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In: International journal of molecular medicine. - 1107-3756 .- 1791-244X. ; 20:2, s. 233-9
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Journal article (peer-reviewed)abstract
- Kinesin is a microtubule-associated motor protein that transports Alzheimer-associated amyloid precursor protein (APP) in neurons. In animal models, impaired kinesin-mediated APP transport seems to enhance formation of the neurotoxic 42 amino acid fragment of beta-amyloid (A beta 42). In man, one study suggests that a polymorphism (rs8702, 56,836G>C) in the kinesin light chain 1 gene (KNS2) may affect the risk of Alzheimer's disease (AD). To further assess KNS2 as a susceptibility gene for AD we analyzed 802 patients with sporadic AD and 286 controls, 134 longitudinally followed patients with mild cognitive impairment (MCI) and 39 cognitively stable controls for the rs8702 polymorphism. The rs8702 polymorphism did not influence risk of AD (p=0.46). However, rs8702 interacted with APOE epsilon 4 carrier status in AD (p=0.006) and influenced cerebrospinal fluid levels of hyperphosphorylated tau in MCI patients who converted to AD during follow-up (p=0.018). These findings support earlier indications that genetic variability in the KNS2 gene may play a role during early stages of AD pathogenesis.
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| 4. |
- Crispin, Xavier, 1972-, et al.
(author)
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The origin of the high conductivity of poly(3,4-ethylenedioxythiophene)- poly(styrenesulfonate) (PEDOT-PSS) plastic electrodes
- 2006
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In: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 18:18, s. 4354-4360
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Journal article (peer-reviewed)abstract
- The development of printed and flexible (opto)electronics requires specific materials for the device's electrodes. Those materials must satisfy a combination of properties. They must be electrically conducting, transparent, printable, and flexible. The conducting polymer poly(3,4-ethylenedioxythiophene) - poly-(styrenesulfonate) (PEDOT-PSS) is known as a promising candidate. Its conductivity can be increased by 3 orders of magnitude by the secondary dopant diethylene glycol (DEG). This "secondary doping" phenomenon is clarified in a combined photoelectron spectroscopy and scanning probe microscopy investigation. PEDOT-PSS appears to form a three-dimensional conducting network explaining the improvement of its electrical property upon addition of DEG. Polymer light emitting diodes are successfully fabricated using the transparent plastic PEDOT-PSS electrodes instead of the traditionally used indium tin oxide. © 2006 American Chemical Society.
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| 6. |
- Landberg, Rikard, et al.
(author)
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Comparison of GC and colorimetry for the determination of alkylresorcinol homologues in cereal grains and products
- 2009
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In: Food Chemistry. - : Elsevier BV. - 0308-8146 .- 1873-7072. ; 113, s. 1363-1369
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Journal article (peer-reviewed)abstract
- Cereal alkylresorcinols (ARs), a group of phenolic lipids mainly found in the outer parts of wheat and rye kernels, are Currently being studied for possible use as biomarkers of intake of whole grain wheat and rye foods. Several different techniques have been used for quantitative AR analysis over the years, but With limited attempts to compare them. In this present Study, two commonly used methods, gas chromatography and colorimetry, were evaluated and compared. Gas chromatographic and the colorimetric methods showed good agreement. The GC-method provides the total amount of AR and relative homologue composition, whereas the colorimetric method, which is based on azo-coupling of a Fast Blue salt to the hydroxyl group(s) in the alkylresorcinol molecule, only provides the total amount, but is much faster and does only requires a UV-spectrophotometer. (C) 2008 Elsevier Ltd. All rights reserved.
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| 7. |
- Onell, Annica, et al.
(author)
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Kinetic determinations of molecular interactions using Biacore : minimum data requirements for efficient experimental design
- 2005
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In: Journal of Molecular Recognition. - : Wiley. - 0952-3499 .- 1099-1352. ; 18:4, s. 307-17
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Journal article (peer-reviewed)abstract
- Reliable kinetic estimates can be obtained from significantly less data than is commonly used today, particularly in the characterization of 1:1 interactions involving low molecular weight compounds and proteins. We have designed a rational and cost-effective strategy to determine kinetic constants using Biacore's surface plasmon resonance-based biosensors and show that the number of measurements necessary for accurate kinetic determinations can be greatly reduced, increasing sample throughput and saving sample material. Simulated and measured data for a range of possible 1:1 interactants were studied to find the minimum requirements of a data set for kinetic analysis. The results showed that kinetic constants in the region 10(4) < k(a) < 10(7) M(-1) s(-1) (association) and 10(-4) < k(d) < 10(-1) s(-1) (dissociation) could easily be determined in a 1:1 interaction model. Owing to the information-dense nature of Biacore data, only two sample concentrations were necessary to reliably determine the kinetics. A standard sample concentration series consisting of 10-fold dilutions between approximately 10 microM and approximately 1 nM consistently provided at least two concentrations with sufficient information about the interaction in this region. Determinations of the constants became increasingly unreliable outside this region. If the rate constants prove to be outside the specified region or the data fits poorly to the 1:1-MTL model, more experiments are required. General recommendations for the design of a cost-effective assay to deliver reliable kinetic measurements are provided.
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| 8. |
- Sjölander, Annica, 1969, et al.
(author)
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Alzheimer's disease: No effect of the CDK5 gene on CSF biomarkers, neuropathology or disease risk
- 2009
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In: Molecular Medicine Reports. - : Spandidos Publications. - 1791-3004 .- 1791-2997. ; 2:6, s. 989-992
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Journal article (peer-reviewed)abstract
- Cyclin-dependent kinase 5 (cdk5) has been identified as one of the kinases that phosphorylates tau at several Alzheimer's disease (AD)-associated sites. Cdk5 is predominantly expressed in neurons, and has higher activity in AD brains than in non-demented brains. To investigate the effect of the CDK5 gene on AD, we analyzed an SNP of the CDK5 gene (rs2069456) in 347 patients with AD and in 157 controls. CDK5 genetic data was investigated in subgroups in relation to biochemical and neuropathological markers for AD. We found no significant differences in genotype or allele distributions between AD patients and controls. None of the CDK5 gene variants influenced biomarkers for AD.
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