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- Göransson, Anna-Lena, et al.
(author)
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Dissecting the Aggregation Events of Alzheimer’s disease Associated Aβ peptide Variants by the Combined use of Different Fluorescent Probes
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Other publication (other academic/artistic)abstract
- The formation of soluble prefibrillar oligomeric species of the amyloid β peptide (Aβ) has been implicated as a causative agent in the development of Alzheimer’s disease (AD). It is therefore important to characterize the properties of these aggregates, which precede the formation of amyloid fibrils. We studied the in vitro aggregation process of two Aβ40 peptide variants through the combined use of four different fluorescent probes and transmission electron microscopy. Previous studies have shown that these two studied Aβ40 variants exhibit different levels of neurodegeneration when expressed in the central nervous system of Drosophila melanogaster. In the present study, we demonstrate distinct differences in aggregate morphology and their binding properties to different fluorescent probes during in vitro fibrillation of these Aβ peptides. Our results indicate a potential link between the observed neurodegenerative properties and the biophysical properties of distinct aggregated Aβ species.
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| 2. |
- Allard, Christina, et al.
(author)
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Rasbiologiskt språkbruk i statens rättsprocess mot sameby : DN Debatt 2015-06-11
- 2015
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Other publication (pop. science, debate, etc.)abstract
- Statens hantering av forskningsresultat i rättsprocessen med Girjas sameby utgör ett hot mot Sverige som rättsstat och kunskapsnation. Åratal av svensk och internationell forskning underkänns och man använder ett språkbruk som skulle kunna vara hämtat från rasbiologins tid. Nu måste staten ta sitt ansvar och börja agera som en demokratisk rättsstat, skriver 59 forskare.
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| 3. |
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| 4. |
- Lord, Anna, 1979-, et al.
(author)
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Arctic Aβ selectively increases diffuse deposition of wild type Aβ in APP transgenic mice with the Swedish mutation
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Other publication (other academic/artistic)abstract
- Studies of familial Alzheimer´s disease (AD) suggest that misfolding and aggregation of amyloid-β (Aβ) peptides initiate the pathogenesis, which causes dementia. The Arctic amyloid precursor protein (APP) mutation results in AD, and Arctic Aβ is more prone to form Aβ protofibrils. Here we show that the number of diffuse Aβ deposits, but not amyloid plaques, is increased if tg-ArcSwe mice synthesizing a low level of Arctic Aβ are crossed with plaque-depositing tg-Swe mice. The diffuse deposits in bitransgenic mice, which contain mainly wild type Aβ42, accumulate in regions both with and without transgene expression. The selective increase of a single type of parenchymal Aβ deposit suggest that different pathways of Aβ aggregation lead to the formation of diffuse and compact Aβ deposits in the brain. The raise in diffuse deposits is most likely due to direct physical interactions between Arctic and wild type Aβ42, and not to altered APP processing in young bitransgenic mice. A mixture of Arctic and wild type Aβ42 facilitates the formation of prefibrillar and fibrillar Aβ assemblies, but inhibits the further elongation of Aβ fibrils in vitro. Our findings might have implications to the pathogenesis of patients who are heterozygous for the Arctic mutation. It also further illustrates how Aβ neuropathology can be manipulated in vivo in a manner reminiscent to prion disorders.
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| 5. |
- Maranon, Antonio, et al.
(author)
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Option framing and Markov chain: A descriptive approach in a state-space modeling of customer behavior
- 2015
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Other publication (other academic/artistic)abstract
- In the field of marketing, option framing is a product or service configuration where the consumers customize the package they wish to procure either by adding options to a base model, an initial configuration with a minimum number of essential features, or by subtracting options from a fully-loaded model, a product or service configuration with both essential and all of the optional features. Additive framing is selecting features to augment the base model, while subtractive framing is deselecting features from the fully-loaded model. A focal issue for companies that could possibly offer such products or services with option framing is finding out which process, additive or subtractive framing, is bound to give a final configuration with more features. The scenarios of option framing can be described by a finite Markov chain process. The Markov chain attempts to capture the decision process of the two types of framing through the estimated probabilities of movement from one phase to the other. In each of the decision phases, the key measure is the number of features in the configuration and the transition probabilities. The option framing is used on an actual study, where the empirical results verify the theories favoring subtractive framing, such as differential loss aversion and anchoring-adjustment theories. Separate Markov chains are evaluated for additive and subtractive framing, with the final configurations of the product or service package, along with the corresponding number of options, as main results.
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| 9. |
- Ahlinder, Jon, et al.
(author)
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Oligotyping reveals divergent responses of predation resistant bacteria to aquatic productivity and plankton composition
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Other publication (other academic/artistic)abstract
- Predation-resistance has been suggested to be a key for persistence of pathogenic bacteria in aquatic environments. Little is known about driving factors for different types of protozoa resistant bacteria (PRB). We studied if presence of PRB is linked to specific plankton taxa, the aquatic nutrient state, or predation pressure on bacteria. Nineteen freshwater systems were sampled and analyzed for PRB, plankton composition and physicochemical variables. Three PRB genera were identified; Pseudomonas, Mycobacterium and Rickettsia. Use of minimum entropy decomposition algorithm and phylogenetic analysis showed that different nodes (representing OTUs of high taxonomic resolution) matched to environmental isolates of the three genera. Links between the PRB genera and specific plankton taxa were found, but showed different relationships depending on if 18S rRNA OTU or microscopy data were used in the analysis. Mycobacterium spp. was negatively correlated to aquatic nutrient state, while Pseudomonas showed the opposite pattern. Rickettsia spp. was positively related to predation pressure on bacteria. Both Mycobacterium and Rickettsia were more abundant in systems with high eukaryotic diversity, while Pseudomonas occurred abundantly in waters with low prokaryotic diversity. The different drivers may be explained by varying ecological strategies, where Mycobacterium and Rickettsia are slow growing and have an intracellular life style, while Pseudomonas is fast growing and opportunistic. Here we give an insight to the possibilities of newly advanced methods such as sequencing and oligotyping to link potential pathogens with biomarkers. This as a tool to assist predictions of the occurrence and persistence of environmental pathogens.
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