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Filtration through standard filter papers may introduce a serious error in total and non-protein nitrogen determinations particularly when the procedure involves repeated filtration prior to analysis. Evidence is presented which indicates that some, if not all, of the soluble nitrogen in filter paper is present as ammonia or ammonium salts. This error can be completely eliminated by the use of small sintered glass filters. 相似文献
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Teachers are always searching for fresh ideas that address children's growth needs. Ideas that provide learning opportunities
which are developmentally appropriate are particularly welcomed. using play as a medium for facilitating literacy growth is
one such opportunity. We know from current theory, research and practice that sociodramatic play contributes to children's
learning. Its importance in the development of literacy skills has also been investigated and affirmed.
See Christie, 1991; Dodge & Frost, 1986; Fisher, 1991; Isenberg & Jacob, 1985; Morrow, 1989, 1990; Morrow & Rand, 1991; Pellegrini,
1980; Rogers & Sawyers, 1988; Schickendanz, 1986; Woodard, 1984. 相似文献
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Scott A. Myers James P. Baker Heather Barone Stephen M. Kromka Sara Pitts 《Communication Research Reports》2018,35(2):131-140
Guided by rhetorical/relational goal theory, the purpose of this study was to examine whether students’ impressions of their instructors’ credibility, attraction, and homophily are influenced by four specific rhetorical and relational communication behaviors that instructors use when communicating with their students in the classroom. Participants were 193 undergraduate students enrolled in a variety of introductory communication courses at a large mid-Atlantic university. Using a series of multiple regression analyses, it was found that (a) clarity emerged as the sole indicator of instructor competence, trustworthiness, and task attraction; (b) clarity and confirmation emerged as indicators of goodwill; and (c) humor and confirmation emerged as indicators of social attraction and attitude homophily. 相似文献