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Simeen Sattar – Journal of Chemical Education, 2024
Lakes are artists' pigments made from colorants bound to an inert substrate, usually hydrated aluminum oxide. Before the late 19th century, lakes were made from natural pigments extracted from plants and insects, extracted either directly from the dyestuff or indirectly from waste materials generated in the manufacture of dyed textiles. The first…
Descriptors: Color, Science Experiments, Laboratory Experiments, Science Education
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Bo Ding; Ju Wang; Yaxin Mao; Tian Meng; Yumei Luo; Xiaomei Xu; Zhanqing Lv; Mian Zhou; Qiuying Yang – Biochemistry and Molecular Biology Education, 2024
Fluorescence-related experimental techniques play an important role in biochemistry, molecular biology, and cell biology. However, fluorescence-related experiments are rarely included in the laboratory courses of most Chinese universities. This is mainly due to the conflict between large class size (50-60 students in one room) and funding/space…
Descriptors: Science Education, Science Laboratories, Laboratory Training, Laboratory Procedures
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Qiu-ting Huang; Yi-dan Zuo; Zhu Zhu; Liu Yang; Zhong-qun Tian; Guo-kun Liu – Journal of Chemical Education, 2024
Nitrate is a crucial parameter for assessing water quality, owing to its dual function in ecological systems. These functions can be beneficial or detrimental depending on whether nitrate concentrations are low or high, respectively. The ultraviolet spectrophotometric method (standard as 4500-NO[subscript 3]--B) is a classic method for determining…
Descriptors: Organic Chemistry, Scientific Concepts, Laboratory Experiments, Laboratory Procedures
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Yildiz, Emre; Arici, Nesrin Ürün – Turkish Online Journal of Educational Technology - TOJET, 2021
The study aimed to determine the effects of students teams achievement divisions (STAD) and reading-writing-application (RWA) methods on teacher candidates' academic achievements, laboratory attitudes, cooperative work, laboratory safety and scientific process skills in science teaching laboratory practice-I courses. In the research, a…
Descriptors: Cooperative Learning, Laboratory Experiments, Laboratory Procedures, Laboratory Safety
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Karunanayake, Akila G.; Dewage, Narada Bombuwala; Todd, Olivia Adele; Essandoh, Matthew; Anderson, Renel; Mlsna, Todd; Mlsna, Deb – Journal of Chemical Education, 2016
Adsorption studies of salicylic acid (SA) and 4-nitroaniline (4NA) from aqueous solutions were performed with magnetic biochar (MBC) in order to train students in analytical techniques such as standard calibration curves, UV-vis spectrophotometry, and chemical separations within the context of wastewater purification. Analysis of samples purified…
Descriptors: Undergraduate Students, Science Education, Chemistry, Scientific Concepts
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Elias, Ryan J.; Hopfer, Helene; Hofstaedter, Amanda N.; Hayes, John E. – Journal of Food Science Education, 2017
The human nose is a very sensitive detector and is able to detect potent aroma compounds down to low ng/L levels. These levels are often below detection limits of analytical instrumentation. The following laboratory exercise is designed to compare instrumental and human methods for the detection of volatile odor active compounds. Reference…
Descriptors: Olfactory Perception, Human Body, Science Laboratories, Laboratory Procedures
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Novo, M. Teresa; Casanoves, Marina; Garcia-Vallvé, Santi; Pujadas, Gerard; Mulero, Miquel; Valls, Cristina – Journal of Biological Education, 2016
We present a practical activity focusing on two main goals: to give learners the opportunity to experience how the scientific method works and to increase their knowledge about enzymes in everyday situations. The exercise consists of determining the amylase activity of commercial detergents. The methodology is based on a qualitative assay using a…
Descriptors: Foreign Countries, Preservice Teachers, Preservice Teacher Education, Science Education
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Landis, Arthur M.; Davies, Malonne I.; Landis, Linda – Journal of Chemical Education, 2009
Cleaning erasers are used to support methanol-fueled flame tests. This safe demonstration technique requires only small quantities of materials, provides clean colors for up to 45 seconds, and can be used in the classroom or the auditorium. (Contains 1 note.)
Descriptors: Chemistry, Science Education, Laboratory Experiments, Laboratory Procedures
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Corotto, Frank; Ceballos, Darrel; Lee, Adam; Vinson, Lindsey – American Biology Teacher, 2010
Students commonly test the effects of chemical agents on the heart rate of the crustacean "Daphnia" magna, but the procedure has never been optimized. We determined the effects of three concentrations of ethanol, nicotine, and caffeine and of a control solution on heart rate in "Daphnia." Ethanol at 5% and 10% (v/v) reduced mean heart rate to…
Descriptors: Control Groups, Metabolism, Science Instruction, Science Education
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Hack, William Nathan; Baird, William H. – Physics Teacher, 2012
The speed of sound is a physical property that can be measured easily in the lab. However, finding an inexpensive and intuitive way for students to determine this speed has been more involved. The introduction of affordable consumer-grade high-speed cameras (such as the Exilim EX-FC100) makes conceptually simple experiments feasible. Since the…
Descriptors: Video Technology, Photography, Motion, Physics
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Mazzola, Carmen; Medalie, Julie; Scherma, Maria; Panlilio, Leigh V.; Solinas, Marcello; Tanda, Gianluigi; Drago, Filippo; Cadet, Jean Lud; Goldberg, Steven R.; Yasar, Sevil – Learning & Memory, 2009
Inhibitors of fatty acid amide hydrolase (FAAH) increase endogenous levels of anandamide (a cannabinoid CB[subscript 1]-receptor ligand) and oleoylethanolamide and palmitoylethanolamide (OEA and PEA, ligands for alpha-type peroxisome proliferator-activated nuclear receptors, PPAR-alpha) when and where they are naturally released in the brain.…
Descriptors: Memory, Inhibition, Drug Use, Brain
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Peihong Liang; Adhyaru, Bhavin; Pearson, Wright L.; Williams, Kathryn R. – Journal of Chemical Education, 2006
The experiment used [to the third power]H-labeled estradiol to determine the binding constant of estradiol to bovine serum albumin. Estradiol must complex with serum proteins for the transport in the blood stream because of its low solubility in aqueous systems and estradiol-protein binding constant, where K[subscript B] is important to understand…
Descriptors: Chemistry, Physiology, Biochemistry, Laboratory Procedures
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Hoffman, A. B.; Hoffman, A. J. – Journal of Chemical Education, 1974
Descriptors: Chemistry, College Science, Instruction, Laboratory Experiments
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Ball, David B.; Miller, Randy M. – Journal of Chemical Education, 2004
A series of sophisticated, combined laboratory experiments are developed involving the use of various spectroscopic and other techniques in the conformational analysis of cyclohexane mechanisms. The multi-system approach enables the students to transcend the one-dimensional procedure, and develops their synthetic and diagnostic skills.
Descriptors: Laboratory Experiments, Science Education, Chemistry, Students
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Kirksey, H. Graden – Journal of Chemical Education, 1974
Descriptors: Chemistry, College Science, Instruction, Laboratory Experiments
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