Search results

Filter

Filetype

Your search for "*" yielded 533485 hits

Klimatförändringen, ekosystem och arter

Den pågående klimatförändringen påverkar redan jordens arter och ekosystem på land, i sjöar, vid kusterna och i haven. Den påverkar enskilda arters utbredning och beteende, vilket i sin tur leder till förändringar i den biologiska mångfalden. Även om andra hot mot den biologiska mångfalden hittills dominerat, kommer effekterna på arter och ekosystem att öka med tilltagande klimatförändring med svå

Impact of Excess Lead Iodide on the Recombination Kinetics in Metal Halide Perovskites

Fundmental comprehension of light-induced processes in perovskites are still scarce. One active debate surrounds the influence of excess lead iodide (PbI2) on device performance, as well as optoelectronic properties, where both beneficial and detrimental traits have been reported. Here, we study its impact on charge carrier recombination kinetics by simultaneously acquiring the photoluminescence q

Modulation of the measuring range of a radioimmunoassay using an organic water two phase system

A commercially available radioimmunoassay (RIA) kit was used to study the effects of organic solvents on antigen-antibody interactions. The RIA analysis was carried out in aqueous-organic two phase systems. After exposure to hydrophobic organic solvents the antibodies retained full binding capacity, while less hydrophobic solvents caused partial inactivation of the antibodies. A practical analysis

Effects of subzero temperatures on the kinetics of protease catalyzed dipeptide synthesis in organic media

A depeptide synthesis was drastically influenced by the reaction temperature, in the range from −30° to 25°C. This article shows the kinetic reasons of this effect. α‐Chymotrypsin was immobilized on celite and used in four different water‐miscible solvents containing small amounts of water‐miscible solvents containing small amounts of water. The reaction studied was the aminolysis of N‐acetyl‐L‐ph

A differential scanning calorimetric study of chymotrypsin in the presence of added polymers

Scanning calorimetry measurements of different amounts of chymotrypsin in water alone gave a temperature of denaturation (Td) value of 54°C. However, when high‐molecular‐weight poly(ethylene glycol) was added to aqueous solutions of chymotrypsin, the thermostability of the enzyme was enhanced. For example, the addition of 20% (w/w) of poly(ethylene glycol) of molecular weight of 100,000 increased

Oxidation of trans- and cis-1,2-cyclohexanediol by Gluconobacter oxydans - Preparation of (R)- and (S)-2-hydroxycyclohexanone

The enzymatic oxidation of 1,2-cyclohexanediol and related substrates by Gluconobacter oxydans (ATCC 621) was investigated. At low pH, membrane-bound enzymes were active and at high pH, NAD-dependent, soluble enzymes showed activity. Whole bacterial cells were used to catalyze some bioconversions. Racemic trans-1,2-cyclohexanediol was oxidized at pH 3.5 to give (R)-2-hydroxycyclohexanone (96% e.e.

Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses

Passivity determines corrosion resistance and stability of highly-alloyed stainless steels, and passivity breakdown is commonly believed to occur at a fixed potential due to formation and dissolution of Cr(VI) species. In this work, the study of a 25Cr–7Ni super duplex stainless steel in 1 M NaCl solution revealed that the passivity breakdown is a continuous degradation progress of the passive fil

Nanoscale imaging of electric pathways in epitaxial graphene nanoribbons

Graphene nanoribbons (GNRs) are considered as major building blocks in future carbon-based electronics. The electronic performance of graphene nanostructures is essentially influenced and determined by their edge termination and their supporting substrate. In particular, semi-conducting, as well as metallic GNRs, can be fabricated by choosing the proper template which is favorable for device archi

Another Primordial Day : the paleo metal diaries

This book contains lavish tales of long dead creatures and reading it may trigger an unexpected consuming impulse for a whole new set of bizarre knowledge and cause a severe addiction to heavy music.

Shielding effects and residual stresses at cleavage due to pre-existing dislocations

The motion of pre-existing edge dislocations in an infinite linear elastic body is studied at initiation of crack growth and at quasi-static steady-state crack growth. Dislocation nucleation is assumed not to occur. Thus, the study concerns only dislocations that are present in the virgin material. A dislocation is assumed to glide if its driving force exceeds a critical value. Changes in dislocat

Surface Classification with Millimeter-Wave Radar Using Temporal Features and Machine Learning

Classification of surfaces using millimeter-wave radar commonly considers the use of polarization-based methods for road condition monitoring. When a surface consists of larger structures, one is instead often interested in monitoring the surface topography, which is typically not resolvable by the limited radar bandwidth. To alleviate this problem, we here consider several phase coherent radar me

Calcium Antagonistic Properties of the Sesquiterpene T‐Cadinol : A Comparison with Nimodipine in the Isolated Rat Aorta

Abstract: (+)‐T‐Cadinol is a sesquiterpene with smooth muscle relaxing properties. In the isolated rat aorta, T‐cadinol relaxed contractions induced by 60 mM K+ in a concentration‐dependent fashion. The dihydropyridine calcium antagonist nimodipine was approximately 4,000 times more potent than T‐cadinol. While both drugs nearly abolished the K+‐induced contractions, they only partially relaxed co

"Give Us Back Sweden!" A Feminist Reading of the (Re)Interpretations of the Folkhem Conceptual Metaphor in Swedish Radical Right Populist Discourse

The present analysis investigates the discursive redefinitions of the folkhem conceptual metaphor, which accommodates centrally located heteronormative masculinities at the intersection of gender, class, and race. It focuses on recent reinterpretations of this conceptual metaphor as heralded by the main Swedish radical right populist party, the Sweden Democrats (SD), and its leader, Jimmie Åkesson

Integration or isolation? Mapping out the position of radical right media in the public sphere

The study explores the validity of the media visibility thesis in a cross-country comparative framework, concentrating on the position of media outlets sympathetic or affiliated to the populist radical right parties in the public spheres in Hungary and Romania. The visibility of such media outlets in the public sphere is considered crucial in the context of discursive opportunities for political m

Has the Swedish business sector become more entrepreneurial than the US business sector?

Recent studies document a 30-year decline in various measures of entrepreneurship in the U.S. Using detailed Swedish employer-employee data over the period from 1990 to 2013, we find young firms to be more prominent in the Swedish business sector than in the U.S. business sector. Young Swedish firms, aged five years or less, account for more than half of all firms during this period. We also obser

Genome-wide mapping of bivalent histone modifications in hepatic stem/progenitor cells

The “bivalent domain,” a distinctive histone modification signature, is characterized by repressive trimethylation of histone H3 at lysine 27 (H3K27me3) and active trimethylation of histone H3 at lysine 4 (H3K4me3) marks. Maintenance and dynamic resolution of these histone marks play important roles in regulating differentiation processes in various stem cell systems. However, little is known reg