ABSTRACT In this experiment daphnia magna a semitransparent fresh water crustacean‚ are used to study the effects of water‚ alcohol and caffeine on heart rate. Daphnia was placed on a clean deep well slide. This was placed under the microscope and brought into focus on the best objective and light contrast. The heart rate was observed and counted within 15seconds and recorded on a table. Introduction Daphnia magna is a fresh water ectothermic crustacean commonly referred to as water
Premium Heart rate Heart Attention-deficit hyperactivity disorder
Background Research Scanning Tunneling Microscope; or STM‚ allows scientists to image or display crystalline material surfaces down to an atomic level. Basically; it shows the formation of surface atoms on conducting and semi-conducting materials such as metals‚ or metalloids. First invented by Gerd Binnig and Heinrich Rohrer in 1981; the Scanning Tunneling Microscope used quantum tunneling to extract atomically resolved images to understand the morphology of crystalline surfaces including both
Premium Electron Sodium hydroxide Chemistry
BIOLOGY 1406 REVIEW FOR EXAM II Chapter 6: A Tour of the Cell I. The microscope A. Differences between light microscope‚ scanning and transmission electron microscope B. Relationship between magnification‚ resolution and contrast II. Compare and contrast prokaryotic and eukaryotic cells III. Know parts of the cells‚ their structure and function A. The nucleus B. Ribosomes C. Endomembrane system 1. Nuclear envelope 2. Endoplasmic reticulum (ER) a. Rough ER-has
Premium Cell Cell membrane Signal transduction
atmosphere is immediately attracted to it’s surface and begins it’s diffusion into the glass. The process of hydration continues until the fresh obsidian surface contains 3.5 percent of water‚ the saturation point of the process. To be observed under a microscope‚ the results of the hydration must be identified into thin sections out normal to the surface. A diffusion front can be recognized by a change of the inner edge of the hydration rind‚ which is refractive index. These rinds of hydration are more
Premium Dew point Archaeology Relative humidity
Honors Biology Study Guide Cells‚ organelles and Microscopes 1) * Ocular-Contains a magnifying lens that focuses the image from the objective into your eye. * Body tube- tube that holds eyepiece and connects the objectives. * Turret- part that holds two or more objective lenses and can be rotated to easily change power. * Objectives- increases the magnification used for viewing. * Stage-Supports dish in correct location to lens. * Stage clips- holds down the dish containing
Free Photosynthesis Cellular respiration Adenosine triphosphate
discovered that she and other human beings were not alone in the world. She described her different views of the world by either using a microscope‚ to see a world too small to see with the naked eye‚ or binoculars‚ to see a world that appears to be sightly never ending. Dillard recalls as a child obbessing over watching the algae in her “child’s microscope set”. She was so dedicated to the point wear she made it possible that she could’ve become ultimately blind because she switched her “dim”
Premium Eye World
What theory states that all living things are composed of cells? Cell theory What type of microscope would be best for studying the detailed structure of the surface of a plasma membrane? Scanning electron microscope The two basic types of cells are ______ and ______. Prokaryotic . . . eukaryotic When using a light microscope to view a cell you obtained from scraping under your fingernails‚ you notice that the cell lacks a nucleus; therefore‚ you conclude that the cell must be a type
Premium Eukaryote Organelle DNA
Experiment 12 Experiment 13 Experiment 14 Experiment 15 Experiment 16 Experiment 17 Experiment 18 Experiment 19 Experiment 20 General Information Practical Work Assessment Guide Table of Summary of Experiments Determination of osmotic potential Use of microscope‚ magnification‚ and measurement of cell size Observation of cells (a) animal cell: cheek cell (b) plant cell: leaf epidermis cell Enzyme activity Separation of photosynthetic pigments using paper chromatography Examining slides of transverse sections
Premium Liver Red blood cell Leaf
stomata using the microscope. (3) Calculating stomata density. Equipment: Eyepiece graticule Microscope Stage micrometer Dicotyledonous leaf ? ivy Clear nail polish Glass slide Clear tape Method 1 Place the graticule scale into the eyepiece of the microscope. This is done by unscrewing the top lens and dropping the scale into the lens body. Then screw the top lens back on. Put the stage micrometer on the stage and hold in place by the clips. Look through the microscope and focus at x40
Premium Leaf Plant physiology Arithmetic mean
lower‚ this would make my results inaccurate. I need to try and limit the human error in the experiment as the daphnia heartbeat is very quick so it will be hard to be completely accurate so we are using the blind method. We need to use the same microscope throughout testing as others may have different strength lenses. I am also going to keep the species of daphnia the same‚ as different species may react differently to the caffeine. I will use the same type of caffeine and record the amount of time
Premium Heart rate