Search results for "RFS"
showing 10 items of 49 documents
Astrometric detection of a low-mass companion orbiting the star AB Doradus
1997
International audience; We report submilliarcsecond-precise astrometric measurements for the late-type star AB Doradus via a combination of VLBI (very long baseline interferometry) and HIPPARCOS data. Our astrometric analysis results in the precise determination of the kinematics of this star, which reveals an orbital motion readily explained as caused by gravitational interaction with a low-mass companion. From the portion of the reÑex orbit covered by our data and using a revised mass of the primary star (0.76 M _) derived from our new value of the parallax (66.3 mas \ n \ 67.2 mas), we Ðnd the dynamical mass of the newly discovered companion to be between 0.08 and 0.11 If accurate photom…
Prevalence of antibodies to human papillomaviruses in the general population of the Czech Republic.
1998
Sera from 450 individuals between the age of 1 and 80 years, representing the general population of the Czech Republic, were tested for the presence of antibodies to human-papillomavirus(HPV)-derived antigens. The following antigens were used: (i) HPV1 virions; (ii) HPV16, -18 and -33-virus-like particles (VLP); (iii) peptides derived from L2 open reading frames (ORFs) of HPV16 and HPV6/11; (iv) peptides derived from HPV16 E2, E4 and E7 ORFs of HPV16. The prevalence of antibodies reactive with the capsid-derived antigens was age-dependent, while no clear age dependence was observed in the distribution of antibodies to peptides derived from HPV16 early proteins. In individual sera, high corr…
Latvijas Vēstures Institūta Žurnāls. 2015, Nr. 4 (97)
2015
Valsts kultūrkapitāla fonds
Valdorfa pedagoģija darbā ar apdāvinātiem bērniem
2022
Neraugoties uz to, ka termini “Valdorfpedagoģija” un “apdāvinātība”, vēl nav definēti Izglītības likumā, tomēr šie izglītības procesi tiek pētīti jau sen – filozofijas, psiholoģijas un pedagoģijas teorijās, un izmantoti skolu praksē. Apdāvinātības un Valdorfpedagoģijas loma Izglītības nozarē ir nozīmīga, jo par ģenialitāti, talantiem, mācību disciplīnu un akadēmiskiem sasniegumiem tiek pētīts daudz, un tie ir noteicošie faktori izglītības kvalitātes uzlabošanai un pedagogu profesionālās kompetences paaugstināšanai darbā ar apdāvinātiem skolēniem. Izglītības sistēma ir jāveido tā, lai sniegtu atbilstošu un iekļaujošu izglītību visiem bērniem, taču daļai bērnu vienmēr būs speciālas mācīšanās …
MILES extended: Stellar population synthesis models from the optical to the infrared
2016
We present the first single-burst stellar population models which covers the optical and the infrared wavelength range between 3500 and 50000 Angstrom and which are exclusively based on empirical stellar spectra. To obtain these joint models, we combined the extended MILES models in the optical with our new infrared models that are based on the IRTF (Infrared Telescope Facility) library. The latter are available only for a limited range in terms of both age and metallicity. Our combined single-burst stellar population models were calculated for ages larger than 1 Gyr, for metallicities between [Fe/H] = -0.40 and 0.26, for initial mass functions of various types and slopes, and on the basis …
Two heterologously expressed Planobispora rosea proteins cooperatively induce Streptomyces lividans thiostrepton uptake and storage from the extracel…
2010
Abstract Background A bacterial artificial chromosomal library of Planobispora rosea, a genetically intractable actinomycete strain, was constructed using Escherichia coli-Streptomyces artificial chromosome (ESAC) and screened for the presence of genes known to be involved in the biosynthesis of antibiotics. Results One clone with a 40 kb insert showed antimicrobial activity against Gram positive bacteria. Insert sequence analysis and subcloning experiments revealed that the bioactivity was due to a 3.5 kb DNA fragment containing two open reading frames. These orfs encode two proteins with high similarity to a putative membrane protein of Streptomyces coelicolor and to the nogalamycin resis…
Comparative analysis of two genomic regions among four strains of Buchnera aphidicola, primary endosymbiont of aphids
2004
Preliminary analysis of two selected genomic regions of Buchnera aphidicola BCc, the primary endosymbiont of the cedar aphid Cinara cedri, has revealed a number of interesting features when compared with the corresponding homologous regions of the three B. aphidicola genomes previously sequenced, that are associated with different aphid species. Both regions exhibit a significant reduction in length and gene number in B. aphidicola BCc, as it could be expected since it possess the smallest bacterial genome. However, the observed genome reduction is not even in both regions, as it appears to be dependent on the nature of their gene content. The region fpr-trxA, that contains mainly metabolic…
Definition of the single integration site of the pathogenicity locus in Clostridium difficile.
1996
We determined the nucleotide sequence 3.8 kb upstream and 5.2 kb downstream of the toxin genes A and B of Clostridium difficile. Nine ORFs were discovered. Based on PCR-directed approaches, two were attributed to the pathogenicity locus (PaLoc). The other seven were found in every C. difficile isolate obtained from the human gastrointestinal tract, respectless of their toxinogenicity. The ORFs cdu1 and cdu2/2' upstream of the PaLoc displayed similarity to repressors of Gram-positive bacteria (cdu1), and to an Na+/H+ antiporter described for Enterococcus hirae (cdu2/2'). Downstream of the locus a putative ABC transporter (cdd2-4) was identified. With a set of three paired primers used in pol…
Statistical analysis of yeast genomic downstream sequences reveals putative polyadenylation signals
2000
The study of a few genes has permitted the identification of three elements that constitute a yeast polyadenylation signal: the efficiency element (EE), the positioning element and the actual site for cleavage and polyadenylation. In this paper we perform an analysis of oligonucleotide composition on the sequences located downstream of the stop codon of all yeast genes. Several oligonucleotide families appear over-represented with a high significance (referred to herein as"words"). The family with the highest over-representation includes the oligonucleotides shown experimentally to play a role as EEs. The word with the highest score is TATATA, followed, among others, by a series of singl…
Interneta mediju “Delfi” un “Tvnet” “Facebook” komentāru sadaļas vide un šo interneta mediju loma tās rediģēšanā un apsekošanā: kara Ukrainā gadījums
2022
Bakalaura darba mērķis ir izpētīt interneta mediju “Delfi” un “Tvnet” “Facebook” komentāru sadaļu vidi, noskaidrojot, ar kādiem paņēmieniem interneta mediju “Delfi” un “Tvnet” darbinieki apseko sava medija “Facebook” komentāru sadaļu laika posmā no 2022. gada 24. februārim līdz 2022. gada 10. martam. Mērķa sasniegšanai ir izvirzīti trīs pētnieciskie jautājumi, uz kuriem atbildes tiks atrastas, pielietojot teorētisko bāzi, kurā tiks izpētīta masu komunikācijas teorija, sociālo mediju darbības pamatprincipi un ietekme uz tradicionālo žurnālistiku, masu mediju auditorija un komentāru vide, vārda brīvība likumā un tās pielietojums žurnālistikā, kā arī empīriskajā daļā tiks veikta mediju “Delfi”…