Hydrodistillation and antimicrobial properties of lemongrass oil (Cymbopogon citratus,Stapf): An undergraduate laboratory exercise bridging chemistry and microbiology

A traditional classroom usually focuses on concepts from a specific discipline. However, solving complex real‐world problems requires integration and application of knowledge from various fields. Here, we describe a 4‐hr undergraduate‐level laboratory exercise that utilizes concepts of extraction and biological property, bridging between chemistry and microbiology courses. In the first half of this exercise, students performed hydrodistillation to extract essential oil from a locally available herb, lemongrass (Cymbopogon citratus, Stapf). In the second half, students investigated the potential antimicrobial activity of the extracted oil against various microorganisms using the Kirby–Bauer disk diffusion method. Students also developed their own experimental questions based on the extracted oil and the antimicrobial testing technique. Self‐assessment questionnaire shows students’ appreciation of the experiments and substantial learning gains in the extraction process, properties of the extracts, and antimicrobial activity testing. This laboratory exercise prompts students to formulate their own experimental questions and engages students in interdisciplinary experimentation.     

Student‐centered integrated anatomy resource sessions at Alfaisal University

Alfaisal University is a new medical school in Riyadh, Kingdom of Saudi Arabia that matriculates eligible students directly from high school and requires them to participate in a hybrid problem‐based learning (PBL) curriculum. PBL is a well‐established student‐centered approach, and the authors have sought to examine if a student‐centered, integrated approach to learn human structures leads to positive perceptions of learning outcomes. Ten students were divided into four groups to rotate through wet and dry laboratory stations (integrated resource sessions, IRSs) that engaged them in imaging techniques, embryology, histology, gross anatomy (dissections and prosections), surface anatomy, and self‐directed learning questions. All IRSs were primarily directed by students. During two second‐semester organ system blocks, forty students responded to a structured questionnaire designed to poll students' perceptions of changes in their knowledge, skills, and attitudes as a result of IRS. The majority (60%) of students felt that the student‐centered approach to learning enhanced their medical knowledge. Most students also felt that the IRS approach was advantageous for formulating clear learning objectives (55%) and in preparing for examinations (65%). Despite their positive feelings toward IRS, students did not view this learning approach as an adequate replacement for the knowledge gained from lectures and textbooks. Students' performance on objective structured practical examinations improved significantly for the two curricular blocks that included IRS compared with earlier non‐IRS blocks. A student‐centered approach to teach human structure in a hybrid PBL curriculum may enhance understanding of the basic sciences in first‐year medical students. Anat Sci Educ 3:272–275, 2010. © 2010 American Association of Anatomists.     

A Multilevel Analysis of Learning Environments and Student Attitudes

An investigation of relationships between students’ attitudes towards chemistry and their perceived laboratory environments was carried out using a sample of 1592 final year secondary school students in 56 chemistry classes in 28 randomly selected co‐educational government schools. This study is distinctive in that it marks the beginning of science classroom environment research in Singapore and because it pioneers the use of the Hierarchical Linear Model (HLM) in learning environment research. The Chemistry Laboratory Environment Inventory (CLEI), a modified version of the Science Laboratory Environment Inventory, was used to assess students’ perceptions of the learning environment in chemistry laboratory classes. Students’ chemistry‐related attitudes were assessed using the Questionnaire on Chemistry‐related Attitudes (QOCRA), which is based on the Test of Science‐related Attitudes. Environment‐attitude relationships were examined using conventional multiple regression analysis and the more rigorous HLM. Positive associations emerged between the nature of the chemistry laboratory classroom environment and the students’ attitudinal outcomes     

Using a student‐centred learning approach to teach a discrete information technology course: the effects on Malaysian pre‐service teachers’ attitudes toward information technology

The purpose of this study was to measure pre‐service teachers’ attitudes toward information technology (IT) after completing a discrete IT course taught in a student centred‐learning (SCL) environment during laboratory sessions. Evidence from this study suggests that there was a positive shift in the participants’ attitudes toward IT. Pre‐test results showed that IT‐competent participants who regarded IT as useful had more confidence and less aversion toward IT. Post‐test results showed increased mean scores on all three dependent variables with no differences between IT‐competent and low IT‐competent participants. The results were supported by interviews which indicate that after completing the IT course, participants were more independent, more creative and possessed collaborative learning skills. The results suggest that infusing SCL into a discrete IT course can help promote and enhance positive attitudes toward IT and enable students to be active participants in their own learning process.     

Developing students' ability to ask more and better questions resulting from inquiry‐type chemistry laboratories

This study focuses on the ability of high‐school chemistry students, who learn chemistry through the inquiry approach, to ask meaningful and scientifically sound questions. We investigated (a) the ability of students to ask questions related to their observations and findings in an inquiry‐type experiment (a practical test) and (b) the ability of students to ask questions after critically reading a scientific article. The student population consisted of two groups: an inquiry‐laboratory group (experimental group) and a traditional laboratory‐type group (control group). The three common features investigated were (a) the number of questions that were asked by each of the students, (b) the cognitive level of the questions, and (c) the nature of the questions that were chosen by the students, for the purpose of further investigation. Importantly, it was found that students in the inquiry group who had experience in asking questions in the chemistry laboratory outperformed the control grouping in their ability to ask more and better questions. © 2005 Wiley Periodicals, Inc. J Res Sci Teach 42: 791–806, 2005     

The use of wikis in a science inquiry-based project in a primary school

This study explored the use of wikis in a science inquiry-based project conducted with Primary 6 students (aged 11–12). It used an online wiki-based platform called PBworks and addressed the following research questions: (1) What are students’ attitudes toward learning with wikis? (2) What are students’ interactions in online group collaboration with wikis? (3) What have students learned with wikis in a science inquiry-based project in a primary school context? Analyses of the quantitative and qualitative data showed that with respect to the first research question, the students held positive attitudes toward the platform at the end of the study. With respect to the second research question, the students actively engaged in various forms of learning-related interactions using the platform that extended to more meaningful offline interactions. With respect to the third research question, the students developed Internet search skills, collaborative problem solving competencies, and critical inquiry abilities. It is concluded that a well-planned wiki-based learning experience, framed within an inquiry project-based approach facilitated by students’ online collaborative knowledge construction, is conducive to the learning and teaching of science inquiry-based projects in primary school.     

Students' thinking in a chemistry laboratory

Despite the almost mandatory inclusion of a laboratory component in the school curriculum very little has been reported about the effects of laboratory instruction upon student learning and attitudes. The present study was undertaken to investigate the thinking of students in a chemistry laboratory. An interpretive research method was adopted in collecting and analysing data gathered from observations, general interviews and stimulated recall interviews. Four high school students were studied during their participation in a week-long university summer school program. This study reports how the four students responded differently to the same laboratory experience. Specializations: chemistry and biochemistry education, thinking in science and industry. Specializations: science education, teacher learning and preparation, teaching thinking.     

Using computer animation and illustration activities to improve high school students' achievement in molecular genetics

Our main goal in this study was to determine whether the use of computer animation and illustration activities in high school can contribute to student achievement in molecular genetics. Three comparable groups of eleventh‐ and twelfth‐grade students participated: the control group (116 students) was taught in the traditional lecture format, whereas the experimental groups received instructions that integrated a computer animation (61 students) or illustration (71 students) activities. We used three research instruments: a multiple‐choice questionnaire; an open‐ended, written questionnaire; and personal interviews. Five of the multiple‐choice questions were also given to students before they received their genetics instruction (pretest). We found that students who participate in the experimental groups improved their knowledge in molecular genetics compared with the control group. However, the open‐ended questions revealed that the computer animation activity was significantly more effective than the illustration activity. On the basis of these findings, we conclude that it is advisable to use computer animations in molecular genetics, especially when teaching about dynamic processes; however, engaging students in illustration activities can still improve their achievement in comparison to traditional instruction. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 45: 273–292, 2008     

An Application of Context- and Problem-Based Learning (C-PBL) into Teaching Thermodynamics

This study aims to investigate the applicability of context- and problem-based learning (C-PBL) into teaching thermodynamics and to examine its influence on the students’ achievements in chemistry, retention of knowledge, students’ attitudes, motivation and interest towards chemistry. The embedded mixed method design was utilized with a group of 13 chemistry students in a 2-year program of “Medical Laboratory and Techniques” at a state university in an underdeveloped city at the southeastern region of Turkey. The research data were collected via questionnaires regarding the students’ attitudes, motivation and interest in chemistry, an achievement test on “thermodynamics” and interviews utilized to find out the applicability of C-PBL into thermodynamics. The findings demonstrated that C-PBL led a statistically significant increase in the students’ achievement in thermodynamics and their interest in chemistry, while no statistically significant difference was observed in the students’ attitudes and motivation towards chemistry before and after the intervention. The interviews revealed that C-PBL developed not only the students’ communication skills but also their skills in using time effectively, making presentations, reporting research results and using technology. It was also found to increase their self-confidence together with the positive attitudes towards C-PBL and being able to associate chemistry with daily life. In light of these findings, it could be stated that it will be beneficial to increase the use of C-PBL in teaching chemistry.     

Effects of active‐learning experiences on achievement,attitudes, and behaviors in high school biology

Active‐learning labs for two topics in high school biology were developed through the collaboration of high school teachers and university faculty and staff and were administered to 408 high school students in six classrooms. The content of instruction and testing was guided by State of Texas science objectives. Detailed teacher records describing daily classroom activities were used to operationalize two types of instruction: active learning, which used the labs; and traditional, which used the teaching resources ordinarily available to the teacher. Teacher records indicated that they used less independent work and fewer worksheets, and more collaborative and lab‐based activities, with active‐learning labs compared to traditional instruction. In‐class test data show that students gained significantly more content knowledge and knowledge of process skills using the labs compared to traditional instruction. Questionnaire data revealed that students perceived greater learning gains after completing the labs compared to covering the same content through traditional methods. An independent questionnaire administered to a larger sample of teachers who used the lab‐based curriculum indicated that they perceived changing their behaviors as intended by the student‐centered principles of the labs. The major implication of this study is that active‐learning–based laboratory units designed and developed collaboratively by high school teachers and university faculty, and then used by high school teachers in their classrooms, can lead to increased use of student‐centered instructional practices as well as enhanced content knowledge and process learning for students. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 44: 960–979, 2007     

Students’ Attitudes Toward Chemistry Lessons: The Interaction Effect between Grade Level and Gender

The purpose of this quantitative study was to examine the interaction effect between grade level and gender with respect to students' attitudes toward chemistry lessons taught in secondary schools. The sample consisted of 954 chemistry students in grades Secondary 4–7 (approximately 16–19 years of age) in Hong Kong. Students' attitudes were surveyed using an attitude toward chemistry lessons scale (ATCLS), and subscale scores were produced on four dimensions: liking for chemistry theory lessons; liking for chemistry laboratory work; evaluative beliefs about school chemistry; and behavioral tendencies to learn chemistry. When the ATCLS data were subjected to two-way MANOVA, the interaction effect between grade level and gender on students' attitudes toward chemistry lessons was statistically significant. The interaction effect was attributable to scores on the theory lessons subscale and laboratory work subscale. Male students in Secondary 4 and 5 liked chemistry theory lessons more than their female counterparts. However, male students' liking for chemistry laboratory work declined when they progressed from Secondary 4 to Secondary 7; no such a significant decline in attitude toward chemistry laboratory work was found in females. Overall, both males and females were just marginally positive about chemistry lessons during the years of secondary schooling. Implications of these findings for curriculum design are discussed.     

A Conflict in Your Head: An exploration of trainee science teachers’ subject matter knowledge development and its impact on teacher self‐confidence

Teachers’ subject matter knowledge (SMK) is one factor contributing to teaching ‘successfully’, as this provides a basis from which pedagogical content knowledge develops. UK‐based trainee science teachers teach all sciences to age 14 and often up to age 16. Trainees have specialist science knowledge in chemistry, physics, or biology from their degrees. Other sciences may not have been studied since school. Thus, trainee science teachers often teach ‘outside specialism’. The extent to which teaching within and outside specialism influences successful teaching, ensuring learning objectives are achieved, was investigated. The sources seventy‐one trainees use for preparing within and outside specialism science lessons for 11–14‐year‐olds and 14–16‐year‐olds and effects on teacher self‐confidence of working in these two domains were probed by questionnaire and interview. All trainees responded to open and closed questions, and Likert‐scale statements exploring preferences for teaching, self‐confidence, handling subject‐related questions within and outside specialism, and attitudes towards learning new SMK. A subgroup of 12 trainees participated in individual semi‐structured interviews. The results are counter‐intuitive: trainees teach more successful lessons outside their specialism, particularly in the early stages. This relates to using a richer range of SMK sources, including, crucially, advice from experienced colleagues. Within specialism, trainees report an inability to select appropriate knowledge and/or strategies and a sense of conflict in teaching inaccurate information. Some ‘anxious’ trainees rely heavily on extant materials for outside specialism teaching. ‘Super‐confident’ trainees able to teach any science focus on selection of appropriate instructional strategies and realise early on the need to transform SMK.     

Epistemological Beliefs and Valuing School: Considerations for College Admissions and Retention

We examine the relationship between high school students' beliefs about the nature of knowledge, or epistemological beliefs, and their attitudes toward education. High school students completed an epistemological questionnaire assessing their beliefs in fixed ability to learn, simple knowledge, quick learning, and certain knowledge. Then they answered open-ended questions on a hypothetical character named Billy. They were to advise Billy if he should go on to college even though his grades were poor and his parents had no money. Finally, they completed questions about their own feelings toward high school and their expectations of the demands of college. Attitudes toward school were then regressed on epistemological belief factor scores. The less students believed in fixed ability to learn and quick learning, the more likely they were to encourage Billy to go to college and to appreciate the role of school in furthering their education, gaining employment, and living everyday life.     

Teacher and school characteristics and their influence on curriculum implementation

Reform‐based curriculum materials have been suggested as a mechanism to make inquiry‐based instruction more prevalent in secondary science classrooms, specifically when accompanied by comprehensive professional development (Loucks‐Horsley, Hewson, Love, & Stiles, 1998 ; Powell & Anderson, 2002 ). This research examines the implementation of a reform‐based high school chemistry curriculum in a large, urban school district. We explicitly consider the role of the teachers' knowledge and beliefs in their implementation of the reform‐based chemistry curriculum, as well as school level factors. Qualitative and quantitative data were collected in the form of beliefs interviews and classroom observations from 27 high school chemistry teachers. Analysis of the data revealed that implementation of the curriculum was strongly influenced by the teachers' beliefs about teaching and learning, and the presence of a supportive network at their school sites. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 44: 883–907, 2007     

The Interaction Between Methods of Instruction and Individual Learning Style

Individual learning differences under competitive and co‐operative methods of instruction were investigated. It was hypothesised that: (a) students would learn more when the method was matched to the student's preference and that (b) the co‐operative (and tutorial) methods would promote more favourable attitudes toward peer students. One hundred and thirty‐two female students participated in the experiment. In the first part of the experiment they were asked to state their preferences and in the second part, half of the students received their preferred method of instruction. Both hypotheses were confirmed. In addition, it was found that students who preferred competition had better initial knowledge of the material, learned more during the learning experience and held somewhat less favourable attitudes toward their peers. The analysis of the results suggests that the interaction between goal, individual, subject‐matter and learning methods needs to be taken into account when determining an optimal method of instruction.     

The affective domain of junior high school students in an audio‐tutorial biology setting

The learning unit, ‘The Cell’, was implemented in a ninth grade junior high school biology course using an individualized audio‐tutorial (IAT) method of instruction. Students’ learning environment their attitudes toward the method and toward science and the understanding of the process of science were investigated. The sample consisted of 105 students in the experimental group and 65 in the control group which was instructed in a traditional lecture‐laboratory method. Data were treated by analysis of covariance and the t‐test results indicate that aspects of the learning environment, such as cooperation and cohesiveness did not diminish in the IAT group, and that factors such as cliqueness, favouritism and competition did not increase. While students expressed favourable attitudes toward some aspects of the IAT method (performing experiments individually, development of independent thinking, self‐examination, rate of learning and self‐achievement), no changes occurred in their attitudes toward science and their understanding the processes of science as a result of being instructed in an IAT setting. Regarding differences between girls and boys, girls expressed more favourable attitudes than boys toward the individualized aspects of the IAT method.     

Eliciting Metacognitive Experiences and Reflection in a Year 11 Chemistry Classroom: An Activity Theory Perspective

Concerns regarding students’ learning and reasoning in chemistry classrooms are well documented. Students’ reasoning in chemistry should be characterized by conscious consideration of chemical phenomenon from laboratory work at macroscopic, molecular/sub-micro and symbolic levels. Further, students should develop metacognition in relation to such ways of reasoning about chemistry phenomena. Classroom change eliciting metacognitive experiences and metacognitive reflection is necessary to shift entrenched views of teaching and learning in students. In this study, Activity Theory is used as the framework for interpreting changes to the rules/customs and tools of the activity systems of two different classes of students taught by the same teacher, Frances, who was teaching chemical equilibrium to those classes in consecutive years. An interpretive methodology involving multiple data sources was employed. Frances explicitly changed her pedagogy in the second year to direct students attention to increasingly consider chemical phenomena at the molecular/sub-micro level. Additionally, she asked students not to use the textbook until toward the end of the equilibrium unit and sought to engage them in using their prior knowledge of chemistry to understand their observations from experiments. Frances’ changed pedagogy elicited metacognitive experiences and reflection in students and challenged them to reconsider their metacognitive beliefs about learning chemistry and how it might be achieved. While teacher change is essential for science education reform, students are not passive players in change efforts and they need to be convinced of the viability of teacher pedagogical change in the context of their goals, intentions, and beliefs.     

Constraints on Conceptual Change: How Elementary Teachers’ Attitudes and Understanding of Conceptual Change Relate to Changes in Students’ Conceptions

Like their students, teachers may hold a variety of naïve conceptions that have been hypothesized to limit their ability to support students’ learning. This study examines whether changes in elementary students’ conceptions are related to their teachers’ content knowledge, attitudes, and understanding of conceptual change. The study takes place in the context of the adoption of a new unit on seasonal change in which students build and use sundials to observe seasonal differences in the apparent motion of the Sun across the sky. A mixed-method approach is used. Data sources include pre- and post-tests for students and teacher interviews and questionnaires. Results indicate that changes in students’ conceptions may be related to their teachers’ knowledge of the content, attitudes toward science, and understanding of conceptual change. One teacher had low attitude toward science and limited knowledge of conceptual change. After instruction, her students’ responses became less accurate but more homogeneous than before instruction. The other teacher had high attitude and moderate knowledge of conceptual change. Her students showed gains from pre- to post-test, including responses that were more scientifically accurate than the teachers’ initial answers.