S 1 Microscope IDL Project Example images Fabric

S 1 Microscope IDL Project

Example images Fabric Font 10 print Daphnia

Get departments involved! • Technical – Design & Build • Biology/Physics – Viewing Daphnia, Waterbears, measure heart rates, measure focal lengths • Art – Piece based on science photos. Display piece for 1 st floor landing? • Computing – Animation of waterbears / Daphnia • HE – Study fabrics warp & weave. • Literacy – Imaginative writing on microscope, pictures and artwork. • Numeracy – Work on scales and magnifications

Biology Investigation: How does Caffeine/Ethanol affect the heart rate of Daphnia? Use your microscope and phone camera to video the Daphnia. Count the number of heart beats in one minute (use slo-mo if you can). Add caffeine or ethanol solution and repeat.

Example worksheet Daphnia Heart Rate: A Daphnia is a tiny crustacean (related to shrimp) that has a clear outside skeleton (carapace) and jointed legs. Like other arthropods, its heart is on its back. The environment challenges each living thing to respond. It includes the air, the water, heat and light, and the chemicals which enter our bodies. Because Daphnia are ECTOTHERMS (cold-blooded), their body temperature changes with the surrounding environment. Since chemical reactions are speeded up in warmer temps, what would you predict the effect of temperature changes would be on their rate of metabolism (and heart rate)? I PREDICT THAT: _________________

Daphnia example Chemicals which enter their bodies can also change their heart rate by interfering with the chemicals that nerves use to transmit signals. Chemicals that speed up heart rate are known as stimulants, whereas chemicals that slow down the heart rate are known as depressants. MATERIALS 4 Daphnia in culture liquid (per table) Transfer pipette A clean depression slide Compound microscope A small container for “used” Daphnia 1% ethanol in a dropper bottle

Physics Example:

Physics. Example: • The focal length is measured with a ruler between the centre of the lens and the sharp image. The focal length of the lens is very short – 7 mm. • Place a bright light bulb far away from the lens – at least 1 m. Move the lens back and forth until a sharp image is seen on the screen. The image will be very small and also upside down. This technique should be practiced first with a large lens. The phone camera focuses in a similar fashion. • Attention should also be drawn to the magnifying properties of the large lens (and by similarity the microscope lens). If the object is less than one focal length away from the lens it will be magnified. Get pupils to magnify their jotter.

Chemistry Example: Growing Copper Sulphate Crystals • Make a saturated solution by dissolving copper sulphate to very hot water. • Filter out the undissolved copper sulphate. • Crystal will form while the solution cools. The quicker the cooling the smaller the crystals formed. • View under microscope using video of even better use slo mo. • May work better/quicker using a microscope slide rather than evaporating basin.