the Daphnia increases. Equipment: * Culture of water flea – Daphnia * Caffeine of 5 different concentrations * Microscope * Counter * Cavity Slide * Pipettes * Stop clock * Distilled water * Test tubes * Petri dish Method: 1. Remove one Daphnia and place it in the cavity slide 2. Remove the pond water and replace it with distilled water 3. Leave it for 5 minutes to acclimatize‚ then observe the heart rate under the microscope for 30 seconds
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The Effects of Temperature‚ Acetylcholine‚ and Adrenaline on the Heart Rate of Daphnia magna Hieu Duong 6 April 2011 Introduction The heart is a muscular organ that constantly pumps blood throughout the human body. The continuous flow of blood creates a system for vital organs within the body to gain oxygen and nutrients. The timely delivery of oxygen to the body’s organs is very crucial. Brain cells‚ for example‚ will die within minutes if the flow of oxygen is obstructed. For the
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Effect of Sugar on Bean Plant Growth Abstract The objective: My project was to determine if bean plants grew stronger and healthier by the addition of the right amount of sugar to their watering. I believe that plants that receive 50 grams of sugar per liter of water would help bean plants grow to be stronger‚ healthier and larger because they would get energy from the sugar. Methods/Materials 36 bean plants were grown in potting soil. The same amount of soil was used in each pot and it had no added
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How far did the Two World Wars attribute to arresting the spread of disease between the 1880s and 1950s? – An essay by Danial Rizvi 11V During the Franco-Prussian War‚ a German doctor‚ Robert Koch‚ became interested in the work of Louis Pasteur. Pasteur was a French doctor whose work on immunization had attracted Koch to get immersed in it. This stirred their rivalry‚ which was flamed by the passion of their patriotic goals. Koch was as hard working and skilled in experimenting as Pasteur. When
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Chemotherapeutic Agents of Control: Introduction: Chemotherapeutic agents are chemical substances used to treat various forms of infectious diseases. The chemotherapeutic agent works by stopping the bacteria from reproducing. There are two different kinds of chemotherapeutic agents. The first kind is an antibiotic‚ which slow down the growth of microorganisms. The second kind of chemotherapeutic agent is synthetic drugs. Synthetic drugs are artificially made in a laboratory. Chemotherapy
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identities of unknown bacteria. Bacteria have three different shapes; cocci‚ bacilli‚ and spirilla. Since bacteria pretty much have the same reflective index as water‚ a bacteria cell must be dyed so that these shapes can be seen. Materials: Petri dish Dropper Cleansing solution Slides Bibulous paper Inoculation loop Crystal violet dye‚ Iodine Acetone Safranin Water from the sink Microscope Clothes pin Bunsen burner Methods: 1. Obtain your slide and draw two circles where your
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who desperately wish to have children. One of these advances is In Vitro Fertilization‚ also known as IVF. IVF‚ or‚ in vitro meaning‚ “in glass” fertilization is the process by which eggs and sperm are combined outside the woman’s body in a glass petri dish and then later transferred back into the uterus in hope of achieving a pregnancy. This amazing technology has been around since the late 1970’s and the first child was born through IVF in 1978. My husband and I were faced with infertility due to
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Fish are trichromatic which means they can see all three of the most important primary colors which are Red‚ Blue and Green which can make many millions of shades of colors. Guppies which are a certain type of small fish mostly Found in trinidad and Barbados where they often do something such as penny pecking which is pecking at an object floating atop of the water as if it is a food and they make the fish peck at the object more depending on its color. Guppies color perception is based on the rods
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Germination in plants is the process in which dormant seed begins to grow and sprout under certain growing conditions. The English pea‚ also known as the garden pea‚ is a member of the legume family and is known to grow roughly three to four inches long. Research shows that it only takes approximately 1 week for the seed to start to germinate. There are many things that can affect‚ the growth of the pea seed such as; temperature‚ moisture‚ planting depth and sunlight. The pea grows best in temperatures
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Planaria Regeneration in Ideal Temperatures vs. Cold Temperatures Christina Malfas Abstract Planaria are flatworms that live in quiet freshwater bodies. They live in a narrow range of temperatures‚ from 22-24°C. They regenerate asexually‚ specifically through a process called epimorphosis‚ in which they completely regenerate one half of their bodies after splitting themselves in two. The diffusion gradient model assumes that cells in an organism “know” their orientation on that organism due
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