Abstract: The purpose of this paper was to examine views of
secondary school science teachers about purposes to use practical
works in school science. The instrument to survey consisted eighteen
items, which were categorized into four components as follows:
‘Scientific inquiry’, ‘Scientific knowledge’, ‘Science-related attitude’,
and ‘STS (science-technology-society)’. Subjects were 152 secondary
school science teachers (male 70 and female 82; middle school 50 and
high school 102), who are teaching in 42 schools of 8 provinces. On
the survey, science teachers were asked to answer on 5-point Lickert
scale (from 1 to 5) how they thought of using practical works on
purposes with domains of science objectives in school. They had
positive views about using practical works for improving scientific
inquiry process skills, science-related attitudes, and perceptions about
STS literacy, and acquiring scientific knowledge. They would have the
most willingness of using practical works for ‘Scientific Inquiry’
among domains of science objectives in school.
Abstract: Ambrosia trifida L. is designated as invasive alien
species by the Act on the Conservation and Use of Biodiversity by the
Ministry of Environment, Korea. The purpose of present paper was to
investigate the inhibitory effects of aqueous extracts of A.trifida on the
development of root hairs of Triticum aestivum L., and Allium
tuberosum Rottler ex Spreng and the electrophoretic protein patterns of
their radicles. The development of root hairs was inhibited by
increasing of aqueous extract concentrations. Through SDS-PAGE,
the electrophoretic protein bands of extracted proteins from their
radicles were appeared in controls, but protein bands of specific
molecular weight disappeared or weakened in treatments. In
conclusion, inhibitory effects of A. trifida made two receptor species
changed morphologically, and at the molecular level in early growth
stage.
Abstract: The purpose of present paper was to investigate
perceptions of Korean secondary school students about social issues
related to biological sciences. Twenty issues were selected based on
topics of articles in the newspaper from 2005 to 2010. The issues were
categorized into biotechnology, health-disease and environment
domains. Subjects were 541 high school students (male 253 and
female 288). On the survey, students were asked to answer on 5-point
Lickert scales how they thought of the effect of biological phenomena
or events related to biological issues on the individual life and the
society. They perceived that the biological issues would be more
effectible on the society than on the individual life. Female students
had a little more perceptions than males.