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- Hu, J., et al.
(författare)
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Detection of clenbuterol hydrochloride residuals in pork liver using a customized surface plasmon resonance bioanalyzer
- 2015
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 10:3
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Tidskriftsartikel (refereegranskat)abstract
- A surface plasmon resonance (SPR) immunoassay with an immobilization of self-assembled molecular identification membrane for the detection of residual Clenbuterol Hydrochloride (CLB) in pork liver was systematically investigated and experimentally validated for its high performance. SPR immunoassay with a regular competitive inhibition assay cannot be directly verified to detect CLB residuals. In this study, the binding of Au film with mercaptopropionic acid was investigated using the known form of the strong S-Au covalent bonds formed by the chemical radical of the mercaptopropionic acid and the Au film. After that, the immunoglobulin IgG of swine (SwIgG-CLB) was bonded with the mercaptopropionic acid by covalent -CO-NH- amide bonding. The modified comprehensive analysis of how the membrane structure works was introduced together with the customized SPR bioanalyzer. In order to evaluate the performance of this biomembrane structure, the concentrations of CLBcontained solutions of 0 ng•mL-1, 10 ng•mL-1, 20 ng•mL-1, 33.3 ng•mL-1, and 40 ng•mL-1 were prepared by adding CLB reagents into the solutions of CLB antibody (Clenbuterol Hydrochloride Antibody, CLB-Ab), successively and then the response unit (RU) was measured individually. Using the data collected from the linear CCD array, the fitting curve was established with the R-Square value of 0.9929. Correspondingly, the recovery rate ranged from 88.48% to 103.21% was experimented and the limit of detection of CLB in 1.26 ng•mL-1 was obtained efficiently. It was concluded that the detection method associated with biomembrane properties is expected to contribute much to the determination of residual CLB in pork liver quantitatively by using the customized SPR bioanalyzer. © 2015 Hu et al.
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- Kaatari, Henrik, PhD, 1982-, et al.
(författare)
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Exploring the effects of target-language extramural activities on students’ written production
- 2023
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Ingår i: Journal of second language writing. - : Elsevier. - 1060-3743 .- 1873-1422. ; 62
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Tidskriftsartikel (refereegranskat)abstract
- Frequent engagement in English extramural activities (i.e., activities that take place outside the classroom) has been found to have a positive impact on EFL learners’ vocabulary knowledge and reading comprehension. In the present study, we aim to extend our knowledge of the possible impact of extramural activities into the realm of second-language writing. Specifically, we investigate the relationship among a number of English extramural activities and two aspects of writing development: lexical diversity and noun phrase complexity. The data are drawn from the Swedish Learner English Corpus (SLEC) which includes texts produced by Swedish secondary school students. The corpus also includes information on how many hours per week students (i) engage in conversations in English, (ii) communicate in English while playing computer/video games, (iii) read in English, (iv) spend time on social media with English content, (v) and watch TV shows or movies in English. The results show that reading in English leads to higher frequency of adjectival modification, whereas conversing in English and watching TV programs positively impact lexical diversity. The results of the study have implications for discussions about the role of L2 classroom instruction vis-à-vis learners’ extramural activities.
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- Kaatari, Henrik, PhD, 1982-, et al.
(författare)
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Introducing the Swedish Learner English Corpus : a corpus that enables investigations of the impact of extramural activities on L2 writing
- 2024
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Ingår i: Corpora. - : Edinburgh University Press. - 1749-5032 .- 1755-1676. ; 19:1, s. 17-30
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Tidskriftsartikel (refereegranskat)abstract
- This paper introduces the Swedish Learner English Corpus (slec), which consists of argumentative texts in English that are written by Swedish junior and senior high school students. slec includes rich metadata, enabling empirical studies of various extra-linguistic variables. Most noteworthy is the inclusion of detailed information on students’ extramural English activities (ee), such as reading, watching, conversing, gaming and engaging in social media in English. In addition, a sub-set of texts from slec have been assessed for proficiency using the Common European Framework of Reference for Languages (cefr). This paper provides an overview of the corpus compilation process, the metadata, and the available versions of slec. Researchers, teachers and students can access this resource to investigate various aspects of second language use and development, such as the impact of extramural language activities on linguistic complexity.
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- Wang, Y., et al.
(författare)
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Let's say : Phraseological patterns of SAY in academic ELF communication
- 2021
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Ingår i: Journal of English for Academic Purposes. - : Elsevier. - 1475-1585 .- 1878-1497. ; 54
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Tidskriftsartikel (refereegranskat)abstract
- Formulaic sequences (e.g., on the other hand, for example, as can be seen) are prevalent in academic discourse. Apart from their various functions, research in the field has uncovered a range of contextual and individual factors associated with the use of formulaic sequences, including genre, discipline, and the user's L1 as well as expertise level. However, most previous studies focus on written discourse and employ a frequency-based approach (e.g., lexical bundles, n-grams). The inherent limitations of the approach are of particular relevance to ELF communication, which involves a high degree of flexibility adaptability. The present study aims to explore features of formulaicity in spoken ELF academic discourse. Through a close examination of the phraseological patterns of one verb SAY in a one-million-word corpus of spoken ELF communication in academic settings, the present study is able to overcome some of the limitations of the frequency approach, thereby shedding further light on formulaicity in language use characterising this particular community and its relationship with factors such as event type, discipline, and individual preference.
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