In this activity, students formulate their own inorganic sunscreen at two SPF values using zinc oxide. The aim is to learn more about the composition of sunscreens, while also exploring key concepts such as concentration, solubility, polarity and emulsions. This activity will take approximately 50 minutes. Materials Using UV beads, which contain pigments which react with ultraviolet light from the sun, they carry out a simple comparative test.

Ultraviolet Detecting Beads - 250 Beads Per Pack 1 X Ultraviolet Detecting Beads - 250 Beads Per Pack

Experiment by submerging coloured beads in water of different temperatures (lukewarm, hot and ice cold). How does temperature affect the rate at which the beads (or pigment molecules) revert to being colour-free? Multiple Perspectives extension) Conclude the lesson by showing the Using Lasers to Detect Skin Cancer video clip (2:13 minutes) on laser skin treatment with Dr. Anita Jansen, professor of biomedical engineering at Vanderbilt University. Students can devise their own investigations and create new hypotheses by expanding on the previous procedure to test other sunscreens. For example:We're delighted that the Stanford SOLAR (Solar On-Line Activity Resource) Center, in conjunction with NASA and the Learning Technologies Channel, have incorporated our UV Detecting Beads in their UV light lesson plans. If you're interested in lessons that really GLOW with hands-on activities, you'll want to take a look at these free resources: This article is a great example of a cross-curricular project that offers learning in an active way. The activities provide the perfect mix of discussion, analysis and experiment on the topic of sunscreens and their UV protection – something that is highly relevant to teenagers. Compare two store-bought sunscreens (choose among sunscreens of activity 1), one of SPF 15 and the other of SPF 30, keeping the brand and sunscreen type the same. Marieb, Elaine N. Essentials of Human Anatomy and Physiology. Seventh edition. San Francisco, CA: Benjamin Cummings, 2003.

UV Beads - Steve Spangler Science Teach Sun Safety with UV Beads - Steve Spangler Science

Medical technologies include prevention and rehabilitation, vaccines and pharmaceuticals, medical and surgical procedures, genetic engineering, and the systems within which health is protected and maintained.Supreme Top Quality 100% Natural Bumble Bee Jasper Pear Shape Cabochon Loose Gemstone Pair,For Making Jewelry 35.00 Ct 28X18X4 MM UV-422 Place on a tray: control and experiment bags from Part A and one of each of the materials from the front bench (clear plastic, opaque plastic, sunglasses, glass plate, foil and cloth). Take the tray outside to an area of direct sunlight. Though ultraviolet (UV) light can be detected with electronic devices, a simple and colorful way to detect ultraviolet (UV) light is with UV-sensitive beads. UV beads change color when they are exposed to sunlight or to another ultraviolet (UV) light source, but they remain white or off-white when indoors. Because lightbulbs in homes and businesses do not produce ultraviolet light, the UV beads are colorless when kept indoors. But if you take them outside on a sunny day, UV light from the Sun turns them a variety of colors, including red, orange, yellow, blue, and purple. Some people even make bracelets from the beads so they know when they are exposed to UV light.

Reaction and Activation Enthalpy - STEM Learning Rates of Reaction and Activation Enthalpy - STEM Learning

Students can use these UV Beads in experiments to support mathematical representations of UV light versus white light. UV-sensitive beads are typically constructed of two large planar conjugated molecules. Before exposure to UV light, these molecules are not bonded and appear colorless. Upon exposure to UV light, the two molecules bond to form a larger complex that absorbs a certain wavelength of light, resulting in a visible color. The longer the conjugated molecule, the longer the wavelength of light absorbed; thus, different colors of beads can be produced by using different molecules in the manufacture of the beads. When placed in the dark, the beads return to their colorless appearance, indicating that this is a reversible reaction in the absence of the UV light.In class, have students write journal entries to answer the following question: What are your initial ideas about how to answer these two questions? What is the purpose of an experimental control? Give one specific example of a control used in this experiment. Move the UV beads into a dark container so that they are not exposed to light. Add four new, unexposed beads to the petri dish. Martin, M. Cutadapt removes adapter sequences from high-throughput sequencing reads. EMBnet J. 17, 5–7 (2011). Students can use this tool to develop and use a model to describe how waves are reflected, absorbed, or transmitted through various materials.