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Professor Kontaktinformation E-post: helena [dot] alexanderson [at] mgeo [dot] lu [dot] seOrganisation Miljö- och geovetenskapliga institutionen (MGeo) Hämtställe: 16 WebbplatsHelena Alexandersons profil i Lunds universitets forskningsportalSom kvartärgeolog är mitt huvudsakliga intresse att få veta mer om vad som hänt under kvartärtidens istider och mellanistider, att förstå samspel mellan is, ha
https://www.geologi.lu.se/helena-alexanderson - 2026-07-22
The present study focuses on fragmented deglycosylated pyranose dehydrogenase (fdgPDH) from Agaricus meleagris recombinantly expressed in Pichia pastoris. Fragmented deglycosylated PDH is formed from the deglycosylated enzyme (dgPDH) when it spontaneously loses a C-terminal fragment when stored in a buffer solution at 4 degrees C. The remaining larger fragment has a molecular weight of similar to
We evaluated the relation between serum FGF23 and bone mineral density (BMD) in a community-based cohort of elderly men. There was a weak correlation between FGF23 and BMD, which was primarily dependent on body weight. FGF23 is a hormonal factor produced in bone and regulates serum levels of phosphate (Pi) and vitamin D. FGF23 over-expression is associated with skeletal abnormalities, including ri
Weathering of soil minerals is important for the recovery from acidification and for the sustainability of forestry. However, there is still substantial uncertainty about its absolute rate. This study presents a harmonized comparison of field weathering rates estimated with the mechanistic model PROFILE and the depletion method for 16 intensively sampled soil profiles across Sweden representing di
The widespread use of artificial nestboxes has led to significant advances in our knowledge of the ecology, behaviour and physiology of cavity nesting birds, especially small passerines Nestboxes have made it easier to perform routine monitoring and experimental manipulation of eggs or nestlings, and also repeatedly to capture, identify and manipulate the parents However, when comparing results ac
Human calcitonin (hCT) is a peptide hormone with therapeutic potential for bone-related disorders, yet its clinical application is hindered by a strong propensity to form amyloid fibrils. Strategies that effectively suppress hCT aggregation are therefore essential for enabling its reintroduction into pharmaceutical development. In our previous work, heme emerged as a potent inhibitor of hCT fibril
Populärvetenskaplig sammanfattning: Vinderosion på jordbruksmark har länge varit ett välkänt faktum trots att någon utförligare undersökning om dess omfattning och skadeverkan inte tidigare genomförts. Mot bakgrund av detta har därför ett nordeuropeiskt projekt, WEELS (Wind Erosion on European Light Soils), dragits i gång som syftar till kartlägga vinderosionen på sandig jordbruksmark i norra Euro
Gross primary production (GPP) of the vegetation is the largest carbon exchange process of the global carbon cycle. Currently, within satellite-based remote sensing, GPP is generally modelled using linear light use efficiency models where GPP is related to photosynthetically active radiation absorbed by the green vegetation (APAR). These models work well on moderate to low spatiotemporal averaging
III-V semiconductors are a profound part of the optoelectronics industry and new developments in alloy compositions and architectures are constantly emerging. Lowdimensional semiconductors, such as nanowires (NWs) have shown to have improved characteristics in certain areas such as enhanced light absorption and can furthermore be integrated on Silicon (Si) plattforms and are thus predicted to be a
En sedimenttransekt bestående av tio punkter borrades med hjälp av en ryssborr i alkärret vid Kalvöviken på Biskopsmålahalvön i centrala Blekinge. I huvudpunkten togs tre parallella 1 m långa borrkärnor. Sedimentprov togs ur borrkärnorna och undersöktes med hjälp av glödförlust, mineralmagnetiska-, makrofossil-, pollen- och strukturanalyser. Kronologin fastställdes genom två kol-14-dateringar kompA sediment transect based on ten corings were performed with a Russian peat corer in the aldercarr at Kalvöviken on the Biskopsmåla Peninsula in central Blekinge. Three parallel sediment cores were collected at the master coring point. These cores were subsampled and studied by means of loss of ignition (LOI), mineral magnetic measurements, macrofossil analysis, pollen analysis and structural anal
Every year about 15 million people are injured in traffic, 500,000 of these fatally. Developing countries are badly affected. During the worst years of the war in Nicaragua, more people died in traffic accidents than as a direct result of the war. Transport system and infrastructure have developed rapidly in developing countries, while little has been achieved in preventing accidents or lessening
While several scholars do not consider the anointing of (the feet of) Jesus in Bethany described in the Gospel of John to carry any messianic connotations, some claim that a royal messianic notion is behind the anointing. The hypothesis of this paper is that the anointing is indeed to be understood as messianic, but that it is insufficient to consider only one Christological motif to be in the bac
EF-hand proteins are central in many cellular processes being the main group of Ca2+-sensing and buffering proteins in the cell. In the work presented in this thesis we study ligand interactions of three EF-hand proteins; calmodulin, calbindin D28k and secretagogin. We have developed a screening method using proteins arrays and validation of targets with surface plasmon resonance. With have applie
Flexible manufacturing puts high demands on industrial automation in terms of affordable and competitive solutions and is of key importance for short-lot production typically found in small and medium sized enterprises, situations where today manual labour is extensively used despite environmental issues and harsh working conditions. Key factors in the successful introduction of new robot automati
One of the common tools for studying the deformation behavior of the microstructure in polycrystalline materials is crystal plasticity models. These are used to describe texture evolution and hardening due to crystallographic slip. A drawback when using crystal plasticity models is that the calculation of the slip requires solving a set of stiff differential equations for each grain in the microst
Bacterioplankton respiration (BR) may represent the largest single sink of organic carbon in the biosphere and constitutes an important driver of atmospheric carbon dioxide (CO2) emissions from freshwaters. Complete understanding of BR is precluded by the fact that most studies need to assume a respiratory quotient (RQ; mole of CO2 produced per mole of O-2 consumed) to calculate rates of BR. Many
