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Search Results: 1 - 10 of 4099 matches for " Lars Ramberg "
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Diversity, dispersal and disturbance: cladoceran species composition in the Okavango Delta
Markus Lindholm,Dag O. Hessen,Lars Ramberg
African Zoology , 2011,
Abstract: Communities exposed to intermediate disturbances have been shown to be more diverse than more stable or unstable systems. We recorded the diversity pattern of zooplankton in the Okavango Delta, Botswana, a system which include water bodies with different stability with regard to water levels and wet–dry phases, from permanent rivers and lagoons to seasonal floodplains and temporary water-filled rain ponds. The yearly flood pulse caused a gradual shift in aquatic parameters on seasonal floodplains, which promoted zooplankton diversity. Species composition differed between temporal and permanent habitats, but highest diversity was recorded on floodplains. Diversity on floodplains showed a distinct seasonal trend, being low during increasing flood, to highly diverse during high water periods. Density and hatching sequence of major cladoceran species suggested that the bank of resting eggs in the soil is the major source of species occurrence during flooding. We propose that seasonal floodplains, which have significant higher diversity and abundance, serve as source areas for the cladoceran diversity in the Okavango Delta. From these habitats ephippia are dispersed into the other four habitats. The dominant vectors for such dispersal are probably wind and mammals.
The CCAAT/enhancer binding protein (C/EBP) δ is differently regulated by fibrillar and oligomeric forms of the Alzheimer amyloid-β peptide
Veronica Ramberg, Linda M Tracy, Malin Samuelsson, Lars NG Nilsson, Kerstin Iverfeldt
Journal of Neuroinflammation , 2011, DOI: 10.1186/1742-2094-8-34
Abstract: Here we have investigated the effects of Aβ on expression of C/EBP family members with a focus on C/EBPδ in rat primary astro-microglial cultures and in a transgenic mouse model with high levels of fibrillar Aβ deposits (tg-ArcSwe) by western blot analysis. Effects on DNA binding activity were analyzed by electrophoretic mobility shift assay. Cross-talk between C/EBPδ and NF-κB was investigated by analyzing binding to a κB site using a biotin streptavidin-agarose pull-down assay.We show that exposure to fibril-enriched, but not oligomer-enriched, preparations of Aβ inhibit up-regulation of C/EBPδ expression in interleukin-1β-activated glial cultures. Furthermore, we observed that, in aged transgenic mice, C/EBPα was significantly down-regulated and C/EBPβ was significantly up-regulated. C/EBPδ, on the other hand, was selectively down-regulated in the forebrain, a part of the brain showing high levels of fibrillar Aβ deposits. In contrast, no difference in expression levels of C/EBPδ between wild type and transgenic mice was detected in the relatively spared hindbrain. Finally, we show that interleukin-1β-induced C/EBPδ DNA binding activity to both C/EBP and κB sites is abolished after exposure to Aβ.These data suggest that both expression and function of C/EBPδ are dysregulated in Alzheimer's disease. C/EBPδ seems to be differently regulated in response to different conformations of Aβ. We propose that Aβ induces an imbalance between NF-κB and C/EBP transcription factors that may result in abnormal responses to inflammatory stimuli.Alzheimer's disease (AD) is a neurodegenerative disorder and is the most common cause of dementia among the elderly. Accumulation of amyloid-β (Aβ) peptides in the brain is considered to be a key step in the pathogenesis of the disease and leads to formation of amyloid plaques in brain parenchyma. The Aβ peptides can be truncated at both the C- and N-terminal ends, and also undergo posttranslational modifications. Although Aβ1-40 (40 amin
Pragmatism, Belief, and Reduction: Stereoformulas and Atomic Models in Early Stereochemistry
Peter J. Ramberg
Hyle : International Journal for Philosophy of Chemistry , 2000,
Abstract: In this paper I explore the character and role of stereoformulas and models of the atom that appeared in the early history of stereochemistry, including those of Jacobus Henricus van't Hoff, Aemilius Wunderlich, Johannes Wislicenus, Victor Meyer, Arthur Hantzsch, Alfred Werner, and Hermann Sachse. I argue that stereochemists constructed and used stereoformulas in a pragmatic way that ignored the physical implications of the spatial distribution of valence, and that the models of the atom were created to reconcile the physically curious concept of valence with known physical laws. Although such models were explanatory at a deeper level, they had little impact on the theory and practice of chemistry, and were not serious attempts to reduce chemical theory to physical laws.
Crawford, Elisabeth: "Arrhenius: From Ionic Theory to the Greenhouse Effect" (Canton 1996); and Diana Barkan: "Walther Nernst and the Transition to Modern Physical Science" (Cambridge 1999) (book review)
Peter J. Ramberg
Hyle : International Journal for Philosophy of Chemistry , 2000,
Abstract: book review of Crawford, Elisabeth: "Arrhenius: From Ionic Theory to the Greenhouse Effect" (Canton 1996); and Diana Barkan: "Walther Nernst and the Transition to Modern Physical Science" (Cambridge 1999)
Methods and Styles in the Development of Chemisty by Joseph S. Fruton
Peter J. Ramberg
Aestimatio : Critical Reviews in the History of Science , 2005,
Abstract:
Curando mentes, tratando cérebros: Psiquiatria entre biologia e subjetividade
Bj?rn Ramberg
Revista Redescri??es : Revista on-line do GT de Pragmatismo e Filosofia Norte-Americana , 2009,
Abstract:
ILCWS08 Test Beam Summary
Erik J. Ramberg
Physics , 2009,
Abstract: A summary is given of the high energy test beam facilities around the world. Attention is placed on the capabilities and availability of each. A short description is given of what kind of additional facilities are required in the future to support ILC detector research.
Differences in the Defense Mechanism Technique modified (DMTm) between Depressive and Somatoform Disorder Patients  [PDF]
Lars Olsson
Open Journal of Depression (OJD) , 2015, DOI: 10.4236/ojd.2015.41001
Abstract: Differences in the Defense Mechanism Technique modified (DMTm), a percept-genetic tachistoscopic technique, between 56 patients with a main diagnosis of mild, moderate or severe unipolar depression and 42 with a main diagnosis of somatoform disorder were studied. As expected, the affect defenses of inhibition, introaggression and barrier isolation—all through their specified motive related to the depressive position of the affect positions model of the Andersson developmental and psychodynamic model of the mind—appeared more often with the depressive than the somatoform patients. Repression scored at the place of the threatening person in the DMTm pictures (Pp-repression) was more often found with the depressive patients, projected introaggression and no Pp-repression but repression scored at the place of the non-threatening person (H-repression) with the somatoform. In total less than four scorings of affect anxiety and affect defense, seen to indicate alexithymia, characterized the somatoform patients and those with mild depression. Denial through reversal II 3 and denial through reversal IV were common with the somatoform patients and those with severe depression. Denial was uncommon with mild depression. Denial, denial through reversal II 3 and denial through reversal IV increased the more severe the depression. The findings were interpreted according to the Andersson model.
On the Nature of Suicide—Suicide as a Multipurpose Behaviour Nested in the Human Mind—An Alternative View!  [PDF]
Lars Jacobsson
Open Journal of Psychiatry (OJPsych) , 2018, DOI: 10.4236/ojpsych.2018.82013
Abstract: Suicide is a universal human phenomenon and seems to be a multipurpose behaviour which occurs in a number of different situations that not necessarily have to do with mental distress/disorder. It might as well be a kind of defence of a threatened self-image or revenge or punishment or weapon in a struggle for something more important than the own life. Is there a suicidal virus or meme nested in the human mind? Maybe it is the mere idea of suicide as an alternative way of dealing with a number of human dilemmas that should be the focus of our suicide preventive efforts? Suicide ideas are common in most populations, but ideas are just ideas. It is when the ideas—the suicidal thoughts—are converted to actions that they become dangerous. The focus for our suicide preventive work should be to counteract a destructive use of suicidal ideation. So, the crucial question is thus: how do we do that?
Culex quinquefasciatus (Diptera: Culicidae) as a potential West Nile virus vector in Tucson, Arizona: Blood meal analysis indicates feeding on both humans and birds
Margaret Zinser,Frank Ramberg,Elizabeth Willott
Journal of Insect Science , 2004,
Abstract: Most reports from the United States suggest Culex quinquefasciatus mosquitoes feed minimally on humans. Given the abundance of C. quinquefasciatus in residential Tucson and parts of metropolitan Phoenix, and the arrival of West Nile virus to this area, discovering the blood meal hosts of the local population is important. Using a sandwich ELISA technique, the local C. quinquefasciatus were found to feed on both humans and birds. This suggests they should be considered potential West Nile virus vectors.
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