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A new and improved Holocene tephra stratigraphy and tephrochronological framework for eastern and northern Iceland is presented. Investigations of a sediment sequence from Lake Lögurinn have revealed a comprehensive tephra record spanning the last 10.200 years. A total of 157 tephra layers have been identified, whereof 149 tephra layers have been correlated to its source volcanic system using geoc
Background Colic affects at least 10% of newborns and parents seek help. The aim of this study was to present why infants whose parents sought help for colic, where not included in two colic trials and to describe the use and perceived effect of simethicone and probiotics amongst those infants who were included. Method A quantitative, descriptive sub-study based on unpublished data collected in
This article reports a comprehensive review of the research conducted regarding occupational balance. A scoping study method was used to explore and describe current research about occupational balance and to identify research gaps. Twenty-two articles published between 2009 and 2014 met the inclusion criteria. The articles reported studies conducted in eight countries on four continents, but the
Semi-arid regions play an increasingly important role as a sink within the global carbon (C) cycle and is the main biome driving inter-annual variability in carbon dioxide (CO2) uptake by terrestrial ecosystems. This indicates the need for detailed studies of spatiotemporal variability in C cycling for semi-arid ecosystems. We have synthesized data on the land-atmosphere exchange of CO2 measured w
In this study the effect of the dispersed state of soy phosphatidylcholine on emulsification is investigated. The emulsifier is either dispersed in the aqueous phase (coarsely, as small vesicles, as large vesicles), or it is dispersed in the oil phase. Oil-in-water emulsions are prepared with the emulsifier present in the different dispersed states. High-pressure homogenization is used for the emu
Familial osteochondritis dissecans (FOCD) is an inherited skeletal defect characterized by the development of large cartilage lesions in multiple joints, short stature, and early onset of severe osteoarthritis. It is associated with a heterozygous mutation in the ACAN gene, resulting in a Val-Met replacement in the C-type lectin domain of aggrecan. To understand the cellular pathogenesis of this c
Articular cartilage consists of chondrocytes and two major components, a collagen-rich framework and highly abundant proteoglycans. Most prior studies defining the zonal distribution of cartilage have extracted proteins with guanidine-HCl. However, an unextracted collagen-rich residual is left after extraction. In addition, the high abundance of anionic polysaccharide molecules extracted from cart
The determination of proteins utilising a polymer-based restricted access support material with ion exchange properties (IERAM) is outlined. Solid phase extraction coupled on-line with a microbore reversed phase HPLC system for the quantitation of small marker proteins is demonstrated. The cation-exchange restricted access packings were characterised with respect to their adsorption and desorption
The development of high-speed flow immunoassay techniques is described. The principles are based on heterogeneous flow immunoassay interactions. High sample throughput can be used for screening small analytes in a number of biological matrices originating from samples of water from environmentally polluted areas, or biological fluids such as urine and plasma. The immunochemical detection principle
Protein identification through peptide mass mapping by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has become a standard technique, used in many laboratories around the world. The traditional methodology often includes long incubations (6-24 h) and extensive manual steps. In an effort to address this, an integrated microanalytical platform has been d
An integrated protein microcharacterization/identification platform has been developed. The system has been designed to allow a high flexibility in order to tackle challenging analytical problems. The platform comprises a cooled microautosampler, an integrated system for microcolumn HPLC, and a capillary reversed-phase column that is interfaced to matrix-assisted laser desorption ionization time-o
This work presents a simple method for obtaining homogeneous sample surfaces in matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOFMS) for the automated analysis of peptides and proteins. The sample preparation method is based on applying the sample/matrix mixture onto a pre-deposited highly diluted matrix spot. The pre-deposited crystals act as seeds for the ne
This paper presents a picoliter sample preparation technique utilizing the flow-through principle, allowing on-line coupling of chromatographic systems to be made. The work was performed in order to investigate the characteristics and the physicochemical properties of the sample preparation using typical mobile phase conditions from μ-CLC (column liquid chromatography) separations. The device pres
Antibodies were characterised using fluorescence polarisation, a homogeneous assay technique in which all reagents are in solution. Kinetic studies on the association and dissociation of the immunocomplex were performed. A competitive assay was used and the sensitivities, operational linearities, as well as the specificities of the immunoassays were experimentally determined for various antibody p
This paper describes a heterogeneous competitive flow immunoassay with a high sample throughput which can be used for the screening of smaller analytes in various samples. The method is based on off-line incubation of the analyte (Ag), a fluorescent labelled tracer (Ag*) and the corresponding antibody (Ab). The separation of bound (Ab-Ag*) and free tracer (Ag*) is based on a size exclusion and rev
A flow immunodetection system with high sample throughput capacity is described for the screening of various analytes. The immunochemical detection principle is based on the chromatographic separation of the formed immunocomplex (AbAg or AbAg*) and the free antigen (Ag) by a restricted access (RA) column, utilising size-exclusion and reversed-phase mechanism. A fluorescein labelled analyte (Ag*) w
Two immunoassay formats, magnetic particles-based assay (Atrazine RaPID assay and Atrazine High-Sensitivity RaPID assay) and microtiter plate based assay (Department of Entomology and Environmental Toxicology, University of California in Davis) were evaluated for the determination of atrazine in sea water samples. The results obtained were compared and validated with those obtained by using on-lin
A coupled-column liquid chromatographic system using solid phase extraction pre-columns for the seven chlorotriazines, atrazine, desethylatrazine, desisopropylatrazine (DIA), propazine, simazine, desethylterbuthylazine and terbuthylazine, using photodiode-array detection (PDAD) was developed. Restricted access (RA), was investigated as a pre- column material, making use of non-adsorptive size excl
The characterization and analytical performance of a tyrosinase graphite-epoxy electrode for the detection of phenolic compounds are described. The biocomposite configuration is based on the entrapment of commercially available tyrosinase in a graphite-epoxy matrix, and the mixing of the resulting conductive epoxy resin with a hardener. The enzyme electrode is mounted as a working electrode in an
