Search results

Filter

Filetype

Your search for "*" yielded 534488 hits

The fundamental definition of "radial velocity''

Accuracy levels of metres per second require the fundamental concept of``radial velocity'' for stars and other distant objects to be examined,both as a physical velocity, and as measured by spectroscopic andastrometric techniques. Already in a classical (non-relativistic)framework the line-of-sight velocity component is an ambiguous concept,depending on whether, e.g., the time of light emission (a

Exporting may not always boost firm productivity

A large empirical literature suggests the performance characteristics of firms that export are different from firms that do not. Specifically, exporters tend to be larger, more productive and pay higher wages than non-exporters. This paper reports on an econometric analysis of the characteristics of exporters and nonexporters in Swedish manufacturing industry. We use matching and difference-in-dif

Comparison of the helix-coil transition of a titrating polypeptide in aqueous solutions and at the air-water interface

The transition from a-helix to random coil of the titrating polyamino acid Co-poly-L-(lysine, phenylalanine), (p-(Lys,Phe)), has been investigated as a function of pH and ionic strength in aqueous solution and at the air water interface by means of circular dichroism (CD) spectroscopy and the Langmuir surface film balance technique. The results strongly suggest that the helix-coil transition for p

When computers became of interest in politics

Technical progress was for a long time uncontroversial in the Scandinavian left and labor movements. World events like the American war in Vietnam and a new zeitgeist changed this at the end of the sixties and politically aware computer enthusiasts started seeing computers in a new light. Three themes were central in the Swedish discussion: the IBM hegemony, computers, personal privacy, and the th

ANTIMICROBIAL ACTIVITIES OF HISTIDINE-RICH GLYCOPROTEIN AND CATIONIC PEPTIDES

In an environment full of potential pathogens it is of importance for organisms to mount a fast and effective defence. Antimicrobial peptides are ancient and integral effector molecules of the innate immune system. They are found in all kinds of species from bacteria to plants and animals, indicating their importance during evolution. They possess a broad-spectrum antimicrobial activity and some p

The usage of Stromgren photometry in studies of local group dwarf spheroidal galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients

Aims. In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. identify red giant branch stars that are members in a dwarf spheroidal galaxy; 2. derive age-independent metallicities for the same stars and quantify the associated errors. Methods. Stromgren uvby photometry in a 11 x 22 arcmin field centered on the Draco dwarf spheroidal galaxy was obtained using the

Measurement of deeply virtual Compton scattering at HERA

A measurement is presented of elastic deeply virtual Compton scattering gamma* p -> gamma p made using e(+) p collision data corresponding to a luminosity of 46.5 pb(-1), taken with the H1 detector at HERA. The cross section is measured as a function of the photon virtuality, Q(2), the invariant mass of the gamma* p system, W, and for the first time, differentially in the squared momentum transfer

Word length, sentence length and frequency : Zipf's law revisited

This paper examines data from English, Swedish and German in order to find a theoretical distribution that describes the observed relation between word length and frequency. In Swedish and English, most word tokens consist of three letters only, while shorter or longer words occur less frequently. We found that the equation with the general form fexp = a * Lb * cL (a variant of the so-called gamma

The chronology of tooth development in wild boar - A guide to age determination of linear enamel hypoplasia in prehistoric and medieval pigs

Linear enamel hypoplasia (LEH) is transverse lines or bands on the enamel of teeth caused by developmental stress during the formation of the tooth crown. LEH has shown to be useful as a stress marker in studies of health conditions in past populations of pigs. The chronology of LEH and the age at which animals of past populations where afflicted by metabolic stress can be determined based on toot

Domain-structure analysis of recombinant rat hormone-sensitive lipase

Hormone-sensitive lipase (HSL) plays a key role in lipid metabolism and overall energy homoeostasis, by controlling the release of fatty acids from stored triglycerides in adipose tissue. Lipases and esterases form a protein superfamily with a common structural fold, called the alpha/beta-hydrolase fold, and a catalytic triad of serine, aspartic or glutamic acid and histidine. Previous alignments

Does particle decay cause wave function collapse: an experimental test

We describe an experimental test of whether particle decay causes wave function collapse. The test uses interference between two well separated, but coherent, sources of vector mesons. The short-lived mesons decay before their wave functions can overlap, so any interference must involve identical final states. Unlike previous tests of non-locality, the interference involves continuous variables, m

Also with a restrictive transfusion policy, screening with second-generation anti-hepatitis C virus enzyme-linked immunosorbent assay would have reduced post-transfusion hepatitis C after open-heart surgery

The incidence of post-transfusion hepatitis non-A, non-B (PTH-NANB) was prospectively assessed among open-heart surgery patients from the southeast region of Sweden before the introduction of antihepatitis C virus (HCV) blood donor screening. Blood samples for alanine aminotransferase analysis were drawn before and 2, 3, and 4 months after transfusion. Surgery was performed in four centres. Of 190

Cytotoxicity and apoptotic effects of microcystin-LR and anatoxin-a in mouse lymphocytes

There is an increasing amount of knowledge on the cytotoxic properties of cyanotoxins, but relatively little is known regarding their fine specificity and mechanisms of action. In this study, we investigated the influence of microcystin-LR and AnTx-a on mouse B- and T-lymphocyte subpopulations in vitro. Cyanotoxins significantly decreased the cell viability after 4 and 24 h, compared to the untrea

Alpha-1-microglobulin, heme-binding protein, reductase and antioxidant

Popular Abstract in Swedish Alla levande organismer består av celler som tillsammans med molekyler generellt kallade extracellulär matrix bildar en vävnad. Celler innehåller fyra huvudgrupper av byggstenar: socker, fettsyror, aminosyror och nukleotider, vilka i tur och ordning bildar kolhydrater, fetter, proteiner och nukleinsyror. I vävnaderna pågår en ständig omsättning av byggstenarna och molekThis thesis describes structural and functional studies of alpha-1-microglobulin (a1m), a 26 kDa plasma and tissue protein that is evolutionarily well-conserved and belongs to the lipocalin superfamily. The lipocalins are polypeptides of 160-190-amino acids that are folded into an 8-stranded beta-barrel forming a pocket with a hydrophobic interior. a1m carries heterogeneous yellow-brown chromophor

Effective pair-gap of weakly-bound neutrons in deformed nuclei

The dependence of effective pair gap on weakly bound neutron orbits is studied in deformed nuclei in comparison with that in spherical nuclei, solving the Hartree-Fock-Bogoliubov equation in a simplified model in coordinate space with the correct asymptotic boundary conditions. In spherical nuclei the effective pair gap of s1/2 neutrons decreases to zero in the limit that the corresponding Hartree