Wahrheit oder Lüge? Spielerisch zum Leistungsnachweis

Zeitgemässe Hochschullehre verlangt nach zeitgemässen Prüfungsformen. Mit der «Toolbox Assessment » erhalten die Lehrenden der Universität Bern ein praktisches Hilfsmittel, um für ihre Studierenden die beste Methode zu finden.

An automated method for mapping physical soil and water conservation structures on cultivated land using GIS and remote sensing techniques

An efficient and reliable automated model that can map physical Soil and Water Conservation (SWC) structures on cultivated land was developed using very high spatial resolution imagery obtained from Google Earth and ArcGIS, ERDAS IMAGINE, and SDC Morphology Toolbox for MATLAB and statistical techniques. The model was developed using the following procedures: (1) a high-pass spatial filter algorithm was applied to detect linear features, (2) morphological processing was used to remove unwanted linear features, (3) the raster format was vectorized, (4) the vectorized linear features were split per hectare (ha) and each line was then classified according to its compass direction, and (5) the sum of all vector lengths per class of direction per ha was calculated. Finally, the direction class with the greatest length was selected from each ha to predict the physical SWC structures. The model was calibrated and validated on the Ethiopian Highlands. The model correctly mapped 80% of the existing structures. The developed model was then tested at different sites with different topography. The results show that the developed model is feasible for automated mapping of physical SWC structures. Therefore, the model is useful for predicting and mapping physical SWC structures areas across diverse areas.

Electrostatic sampling of trace DNA from clothing.

During acts of physical aggression, offenders frequently come into contact with clothes of the victim, thereby leaving traces of DNA-bearing biological material on the garments. Since tape-lifting and swabbing, the currently established methods for non-destructive trace DNA sampling from clothing, both have their shortcomings in collection efficiency and handling, we thought about a new collection method for these challenging samples. Testing two readily available electrostatic devices for their potential to sample biological material from garments made of different fabrics, we found one of them, the electrostatic dust print lifter (DPL), to perform comparable to well-established sampling with wet cotton swabs. In simulated aggression scenarios, we had the same success rate for the establishment of single aggressor profiles, suitable for database submission, with both the DPL and wet swabbing. However, we lost a substantial amount of information with electrostatic sampling, since almost no mixed aggressor-victim profiles suitable for database entry could be established, compared to conventional swabbing. This study serves as a proof of principle for electrostatic DNA sampling from items of clothing. The technique still requires optimization before it might be used in real casework. But we are confident that in the future it could be an efficient and convenient contribution to the toolbox of forensic practitioners.

Compilation of scientific results of the OASIS project

Seamounts are of great interest to science, industry and conservation because of their potential role as 'stirring rods' of the oceans, their enhanced productivity, their high local biodiversity, and the growing exploitation of their natural resources. This is accompanied by rising concern about the threats to seamount ecosystems, e.g. through over-fishing and the impact of trawling. OASIS described the functioning characteristics of seamount ecosystems. OASIS' integrated hydrographic, biogeochemical and biological information. Based on two case studies. The scientific results, condensed in conceptual and mass balanced ecosystem models, were applied to outline a model management plan as well as site-specific management plans for the seamounts investigated. OASIS addressed five main objectives: Objective 1: To identify and describe the physical forcing mechanisms effecting seamount systems Objective 2: To assess the origin, quality and dynamics of particulate organic material within the water column and surface sediment at seamounts. Objective 3: To describe aspects of the biodiversity and the ecology of seamount biota, to assess their dynamics and the maintenance of their production. Objective 4: Modelling the trophic ecology of seamount ecosystems. Objective 5: Application of scientific knowledge to practical conservation.

De los Códigos a los Repertorios : Algunos atavismos persistentes acerca de la cultura y una propuesta de reformulación

Los debates antropológicos en torno del concepto de cultura han suscitado una serie de refinamientos que supusieron una revitalización y una reconstrucción de esta noción central para las ciencias sociales. Sin embargo, en virtud del peso sedimentado de una doble tradición de raigambre gramática y jurídica, varios de los atributos puestos en cuestión por la crítica antropológica persisten en la ubicua noción de "código", que reintroduce de contrabando una versión anacrónica del concepto de cultura con efectos deletéreos para la investigación en ciencias sociales. Sobre esa base, el presente texto busca mostrar en qué circunstancias, por qué causas y de qué manera esta pervivencia del concepto clásico de cultura subsiste en la antropología contemporánea, al tiempo que propone el reemplazo de esta atávica noción de código por medio de un aparato conceptual y un léxico analítico-descriptivo que busca hacer justicia a los resultados acumulados de tres décadas de debate

De los Códigos a los Repertorios : Algunos atavismos persistentes acerca de la cultura y una propuesta de reformulación

Los debates antropológicos en torno del concepto de cultura han suscitado una serie de refinamientos que supusieron una revitalización y una reconstrucción de esta noción central para las ciencias sociales. Sin embargo, en virtud del peso sedimentado de una doble tradición de raigambre gramática y jurídica, varios de los atributos puestos en cuestión por la crítica antropológica persisten en la ubicua noción de "código", que reintroduce de contrabando una versión anacrónica del concepto de cultura con efectos deletéreos para la investigación en ciencias sociales. Sobre esa base, el presente texto busca mostrar en qué circunstancias, por qué causas y de qué manera esta pervivencia del concepto clásico de cultura subsiste en la antropología contemporánea, al tiempo que propone el reemplazo de esta atávica noción de código por medio de un aparato conceptual y un léxico analítico-descriptivo que busca hacer justicia a los resultados acumulados de tres décadas de debate

De los Códigos a los Repertorios : Algunos atavismos persistentes acerca de la cultura y una propuesta de reformulación

Los debates antropológicos en torno del concepto de cultura han suscitado una serie de refinamientos que supusieron una revitalización y una reconstrucción de esta noción central para las ciencias sociales. Sin embargo, en virtud del peso sedimentado de una doble tradición de raigambre gramática y jurídica, varios de los atributos puestos en cuestión por la crítica antropológica persisten en la ubicua noción de "código", que reintroduce de contrabando una versión anacrónica del concepto de cultura con efectos deletéreos para la investigación en ciencias sociales. Sobre esa base, el presente texto busca mostrar en qué circunstancias, por qué causas y de qué manera esta pervivencia del concepto clásico de cultura subsiste en la antropología contemporánea, al tiempo que propone el reemplazo de esta atávica noción de código por medio de un aparato conceptual y un léxico analítico-descriptivo que busca hacer justicia a los resultados acumulados de tres décadas de debate

Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments

The Wilkes and Aurora basins are large, low-lying sub-glacial basins that may cause areas of weakness in the overlying East Antarctic ice sheet. Previous work based on ice-rafted debris (IRD) provenance analyses found evidence for massive iceberg discharges from these areas during the late Miocene and Pliocene. Here we characterize the sediments shed from the inferred areas of weakness along this margin (94°E to 165°E) by measuring40Ar/39Ar ages of 292 individual detrital hornblende grains from eight marine sediment core locations off East Antarctica and Nd isotopic compositions of the bulk fine fraction from the same sediments. We further expand the toolbox for Antarctic IRD provenance analyses by exploring the application of 40Ar/39Ar ages of detrital biotites; biotite as an IRD tracer eliminates lithological biases imposed by only analyzing hornblendes and allows for characterization of samples with low IRD concentrations. Our data quadruples the number of detrital 40Ar/39Ar ages from this margin of East Antarctica and leads to the following conclusions: (1) Four main sectors between the Ross Sea and Prydz Bay, separated by ice drainage divides, are distinguishable based upon the combination of 40Ar/39Ar ages of detrital hornblende and biotite grains and the e-Nd of the bulk fine fraction; (2) 40Ar/39Ar biotite ages can be used as a robust provenance tracer for this part of East Antarctica; and (3) sediments shed from the coastal areas of the Aurora and Wilkes sub-glacial basins can be clearly distinguished from one another based upon their isotopic fingerprints.