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1.
Veronika Karnowski Larissa Leonhard Anna Sophie Kümpel 《Communication Research Reports》2018,35(2):91-100
Social media have become an integral part of online news use, affecting how individuals find, consume, and share news. By applying the Theory of Reasoned Action (TRA), this study investigates the effects of motives, attitude, and intention on news-sharing behavior among German social media users (n = 333). Findings show that news-sharing attitude and subjective norms have a positive effect on news-sharing intention, which in turn has a positive effect on actual news-sharing behavior. Taken together, we see that a new media behavior in the early phases of its societal diffusion—like social media news sharing in Germany in 2015—can mainly be explained by a rational choice logic and is rooted in the motives of socializing and information seeking. This finding thus reflects the double nature of social media as a means for both information retrieval and social grooming. 相似文献
2.
Schmolke H Demming S Edlich A Magdanz V Büttgenbach S Franco-Lara E Krull R Klages CP 《Biomicrofluidics》2010,4(4):44113
Polyelectrolyte multilayers (PEMs) based on the combinations poly(diallyldimethylammonium chloride)∕poly(acrylic acid) (PDADMAC∕PAA) and poly(allylamine hydrochloride)∕PAA (PAH∕PAA) were adsorbed on poly(dimethylsiloxane) (PDMS) and tested for nonspecific surface attachment of hydrophobic yeast cells using a parallel plate flow chamber. A custom-made graft copolymer containing poly(ethylene glycol) (PEG) side chains (PAA-g-PEG) was additionally adsorbed on the PEMs as a terminal layer. A suitable PEM modification effectively decreased the adhesion strength of Saccharomyces cerevisiae DSM 2155 to the channel walls. However, a further decrease in initial cell attachment and adhesion strength was observed after adsorption of PAA-g-PEG copolymer onto PEMs from aqueous solution. The results demonstrate that a facile layer-by-layer surface functionalization from aqueous solutions can be successfully applied to reduce cell adhesion strength of S. cerevisiae by at least two orders of magnitude compared to bare PDMS. Therefore, this method is potentially suitable to promote planktonic growth inside capped PDMS-based microfluidic devices if the PEM deposition is completed by a dynamic flow-through process. 相似文献
3.
David Hradil Tom&#x; Grygar Janka Hradilov Petr Bezdi
ka Veronika Gr&#x;nwaldov Igor Foga&#x; Costanza Miliani 《Journal of Cultural Heritage》2007,8(4):377-386
The work is focused on identification of lead tin yellow types I and II, Naples yellow, and also on discrimination of a less common, distinct yellow pigment, the ternary Pb-Sb-Sn oxide.The knowledge about all those Pb-based yellows was in fact forgotten after introduction of modern synthetic yellows in 19th century. As late as in the last decade of the 20th century, the existence of Pb-Sb-Sn yellow and its production have been rediscovered, and only then it has been identified in colour layer of artworks.Pb-Sb-Sn yellow has recently been identified in colour layer of 17th century Italian paintings by Sandalinas and Ruiz-Moreno [C. Sandalinas, S. Ruiz-Moreno, Lead tin-antimony yellow, historical manufacture, molecular characterization and identification in seventeenth-century Italian paintings, Stud. Conserv. 49 (2003) 41–52], and here we report the finding of this pigment in Mid-European painting of the 18th and 19th centuries. Lead tin yellows, lead antimony yellow (Naples yellow), and lead antimony tin yellow were synthesized in laboratory following historical recipes, their colour was analyzed, and their structure was confirmed to provide a basis for their routine identification in microsamples of artworks by X-ray microdiffraction. Unequivocal identification of Pb-based yellows could help in authentication of traditional European paintings, because their use was temporally and also geographically specific. Combination of elemental microanalysis (X-ray fluorescence electron microanalysis) and X-ray powder microdiffraction were found very efficient in the microanalysis of colour layers of artworks with Pb-based yellows and their unequivocal identification. 相似文献
4.
Teresa K. Naab Veronika Karnowski Daniela Schlütz 《Communication methods and measures》2019,13(2):126-147
Quantifying the ubiquitous, ephemeral, and highly diverse patterns of mobile social media (MSM) use is a challenge for communication research. Most researchers employ retrospective survey measurement, thus depending on the accuracy of users’ memories and generalizations. Alternatively, some researchers rely on in-situ measurement, being less dependent on users’ memories and generalizations, but requiring random situation samples. To assess differences and similarities between these two measurement approaches we analyzed whether characteristics (duration and frequency of a usage episode, habit, elaboration, and gratifications) of MSM use (regarding Facebook, WhatsApp, and YouTube) vary between retrospective survey and mobile experience sampling measurement. We observe a consistent pattern of higher estimates in retrospect as compared to individual averages of in-situ reports. The absolute magnitude of these differences varies considerably between platforms and characteristics studied. Nonetheless, for most constructs and platforms we find low significant positive correlations between retrospective and aggregated in-situ values. 相似文献
5.
Veronika Honkasalo 《Sex education》2018,18(5):541-554
In Finland, Young people’s sexuality education has not been examined from a multicultural perspective, with the exception of a few policy-oriented papers. This paper examines how cultural diversity is addressed in chapters on sexuality and sexuality education in Finnish health education textbooks. The analysis is based on material contained in textbooks used in grades 7–9 and upper secondary schools. Findings suggest that cultural diversity is included in textbooks in one of two ways: either to demonstrate the uniqueness of liberal, emancipated and progressive ‘Finnish’ sexuality; or as a way of distancing Finland and Finnish values from the rest of the world. In these textbooks, culture is understood as belonging to non-Finnish ‘others’ and a culture that itself as not being Finnish. This somewhat tendentious treatment of cultural diversity leaves teachers with limited tools with which to promote anti-discriminatory education. The textbooks also overlook the diverse backgrounds of young people growing up in Finland today. 相似文献
6.
Markéta ?kereňová Veronika Mikulová Otakar ?apoun Tomá? Zima 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2016,26(1):103-113
Introduction
Nowadays, on-a-chip capillary electrophoresis is a routine method for the detection of PCR fragments. The Agilent 2100 Bioanalyzer was one of the first commercial devices in this field. Our project was designed to study the characteristics of Agilent DNA 1000 kit in PCR fragment analysis as a part of circulating tumour cell (CTC) detection technique. Despite the common use of this kit a complex analysis of the results from a long-term project is still missing.Materials and methods
A commercially available Agilent DNA 1000 kit was used as a final step in the CTC detection (AdnaTest) for the determination of the presence of PCR fragments generated by Multiplex PCR. Data from 30 prostate cancer patients obtained during two years of research were analyzed to determine the trueness and precision of the PCR fragment size determination. Additional experiments were performed to demonstrate the precision (repeatability, reproducibility) and robustness of PCR fragment concentration determination.Results
The trueness and precision of the size determination was below 3% and 2% respectively. The repeatability of the concentration determination was below 15%. The difference in concentration determination increases when Multiplex-PCR/storage step is added between the two measurements of one sample.Conclusions
The characteristics established in our study are in concordance with the manufacturer’s specifications established for a ladder as a sample. However, the concentration determination may vary depending on chip preparation, sample storage and concentration. The 15% variation of concentration determination repeatability was shown to be partly proportional and can be suppressed by proper normalization.Key words: lab-on-a-chip devices, capillary electrophoresis, multiplex PCR, circulating tumour cells, Agilent DNA 1000 kit 相似文献7.
8.
Franziska Veronika Trede 《高等教育研究与发展》2010,29(4):373-387
The diversity of fieldwork education models and practices ranges from mandatory to voluntary, from graded to ungraded, from paid to unpaid spectrums and they vary in length from less than a week to up to one year. Colleagues who work in the same university but in different schools, faculties or campuses are often so busy working within their discipline‐specific arena that there seems to be little opportunity to learn from and collaborate with other disciplines about fieldwork education programs. This paper provides a report on a project that trialled and evaluated an online debate with university staff about fieldwork education issues. The aims were to establish a sustainable university‐wide fieldwork education discourse, to break down profession‐specific silos, to inform the development of university‐wide fieldwork education benchmarks and to foster fieldwork education leadership through online debates. The findings demonstrate that, collectively, participants shared a wealth of experience and wisdom that remained largely untapped at a university‐wide level. Participants’ evaluation highlighted the perceived value of creating a communicative space for a fieldwork education discourse and it exposed aspects of the online environment and time constraints as its biggest barrier. 相似文献
9.
Veronika Licher 《Publishing Research Quarterly》2009,25(1):24-29
A brief review is presented of the Trade book publishing industry in Germany with a focus on bestsellers, authors and titles,
acquisitions and mergers of publishers as well as booksellers and distributors. The data for the Leipzig Book Fair and Frankfurt
Book Fair is presented. The article concludes with a review of awards and prizes presented to authors in 2008. 相似文献
10.
Dipl.-Päd. Nils Berkemeyer Dipl.-Päd. Veronika Manitius Dipl.-Psych. Kathrin Müthing Univ.-Prof. Dr. Wilfried Bos 《Zeitschrift für Erziehungswissenschaft》2009,12(4):667-689
Accompanied by the increasing relevance of school networks, there are a lot of reports available in national and international research regarding this topic. However, a compact summary of those studies and their findings is missing by now. Therefore, this article synthesizes the current research on school networks. Starting with the introduction of theoretical concepts for a better understanding of academic innovation networks, the article examines the empirical findings concerning those networks. This examination is conducted separately for German language and English language research. According to the presented findings, a consistent positive effect of school networks can be traced. The article concludes with a discussion of future research potentials concerning networks. Concrete suggestions for methodical and theoretical designs regarding network research are submitted. 相似文献