The Effect of Structural Differences in English on L2 Acquisition

2018 ◽  
Vol 84 ◽  
pp. 75-91
Author(s):  
Bokyeong Kim
Author(s):  
T. J. Headley

Oxide phases having the hollandite structure have been identified in multiphase ceramic waste forms being developed for radioactive waste disposal. High resolution studies of phases in the waste forms described in Ref. [2] were initiated to examine them for fine scale structural differences compared to natural mineral analogs. Two hollandites were studied: a (Ba,Cs,K)-titan-ate with minor elements in solution that is produced in the waste forms, and a synthesized BaAl2Ti6O16 phase containing ∼ 4.7 wt% Cs2O. Both materials were consolidated by hot pressing at temperatures above 1100°C. Samples for high resolution microscopy were prepared both by ion-milling (7kV argon ions) and by crushing and dispersing the fragments on holey carbon substrates. The high resolution studies were performed in a JEM 200CX/SEG operating at 200kV.


2019 ◽  
Vol 62 (6) ◽  
pp. 1775-1786 ◽  
Author(s):  
Lucía I. Méndez ◽  
Gabriela Simon-Cereijido

Purpose This study investigated the nature of the association of lexical–grammatical abilities within and across languages in Latino dual language learners (DLLs) with specific language impairment (SLI) using language-specific and bilingual measures. Method Seventy-four Spanish/English–speaking preschoolers with SLI from preschools serving low-income households participated in the study. Participants had stronger skills in Spanish (first language [L1]) and were in the initial stages of learning English (second language [L2]). The children's lexical, semantic, and grammar abilities were assessed using normative and researcher-developed tools in English and Spanish. Hierarchical linear regressions of cross-sectional data were conducted using measures of sentence repetition tasks, language-specific vocabulary, and conceptual bilingual lexical and semantic abilities in Spanish and English. Results Results indicate that language-specific vocabulary abilities support the development of grammar in L1 and L2 in this population. L1 vocabulary also contributes to L2 grammar above and beyond the contribution of L2 vocabulary skills. However, the cross-linguistic association between vocabulary in L2 and grammar skills in the stronger or more proficient language (L1) is not observed. In addition, conceptual vocabulary significantly supported grammar in L2, whereas bilingual semantic skills supported L1 grammar. Conclusions Our findings reveal that the same language-specific vocabulary abilities drive grammar development in L1 and L2 in DLLs with SLI. In the early stages of L2 acquisition, vocabulary skills in L1 also seem to contribute to grammar skills in L2 in this population. Thus, it is critical to support vocabulary development in both L1 and L2 in DLLs with SLI, particularly in the beginning stages of L2 acquisition. Clinical and educational implications are discussed.


1969 ◽  
Vol 62 (1_Suppl) ◽  
pp. S13-S30 ◽  
Author(s):  
W. R. Butt

ABSTRACT Several chemical differences between FSH, LH and HCG have been reported: thus LH and HCG are richer in proline than FSH and FSH and HCG contain more N-acetyl neuraminic acid than LH. Sub-units of LH are formed by treatment with urea, guanidine or acid. HCG also may contain two sub-units. The sub-units from LH are biologically inert but retain their immunological activity: biological activity is restored when the sub-units are incubated together. There is much evidence from chemical and enzymic reactions that antigenic groups are distinct from those parts of the molecule essential for biological activity. N-acetyl neuraminic acid and probably other carbohydrates in FSH and HCG are not involved in immunological activity but are necessary for biological activity. Histidine, methionine and possibly cysteine appear to be essential for biological but not immunological activity of FSH, while tryptophan and possibly tyrosine are not essential for either. A few highly specific antisera to gonadotrophins have been prepared in rabbits and guinea pigs to crude antigens: there is no evidence that purified antigens are more likely to produce specific antisera. Differences in the immunological reactivities of urinary compared with pituitary gonadotrophins have been observed both by radioimmunoassay and by the complement fixation technique. The latter may be particularly useful for detecting structural differences in the hormones.


2020 ◽  
Author(s):  
Jelena O'Reilly ◽  
Eva Jakupčević

Although the second language (L2) acquisition of morphology by late L2 learners has been a popular research area over the past decades, comparatively little is known about the acquisition and development of morphology in children who learn English as a foreign language (EFL). Therefore, the current study presents the findings from a longitudinal oral production study with 9/10-year-old L1 Croatian EFL students who were followed up at the age of 11/12. Our results are largely in line with the limited research so far in this area: young EFL learners have few issues using the be copula and, eventually, the irregular past simple forms, but had considerable problems with accurately supplying the 3rd person singular -s at both data collection points. We also observed a be + base form structure, especially at the earlier stage, which appears to be an emergent past simple construction.


2002 ◽  
Vol 93 (1) ◽  
pp. 21-27
Author(s):  
Á. Cziráki ◽  
I. Gerocs ◽  
L. K. Varga ◽  
I. Bakonyi ◽  
U. Falke ◽  
...  

2008 ◽  
Vol 155 ◽  
pp. 23-52
Author(s):  
Elma Nap-Kolhoff ◽  
Peter Broeder

Abstract This study compares pronominal possessive constructions in Dutch first language (L1) acquisition, second language (L2) acquisition by young children, and untutored L2 acquisition by adults. The L2 learners all have Turkish as L1. In longitudinal spontaneous speech data for four L1 learners, seven child L2 learners, and two adult learners, remarkable differences and similarities between the three learner groups were found. In some respects, the child L2 learners develop in a way that is similar to child L1 learners, for instance in the kind of overgeneralisations that they make. However, the child L2 learners also behave like adult L2 learners; i.e., in the pace of the acquisition process, the frequency and persistence of non-target constructions, and the difficulty in acquiring reduced pronouns. The similarities between the child and adult L2 learners are remarkable, because the child L2 learners were only two years old when they started learning Dutch. L2 acquisition before the age of three is often considered to be similar to L1 acquisition. The findings might be attributable to the relatively small amount of Dutch language input the L2 children received.


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