less chance of artifacts because nothing has been done to the specimen. There is less contrast if unstained, but when stained to enhance the contrast, the specimen will eventually die. 9) Based on your observations, what structures do Elodeaand Parameciumshare? What structures are not found in both organisms? 10) What is a stage micrometer? How is it different from an ocular reticle? How are they used together? What is the purpose of an ocular reticle? Then fill in the chart below: A stage micrometer is an accurate scale used to calibrate microscope eyepiece reticles. An ocular reticle is found in the ocular and is a ruler in reticle units that is used to measure objects, the difference between a stage micrometer and an ocular reticle is that the stage micrometer is in millimeters and is used to calibrate the ocular reticle. The reason for the ocular reticle is to measure the length of some component of the object being observed.
4X 10X 40X Reticle unts/0.1mm 4 r.u./0.1 mm 10 r.u./0.1 mm 40 r.u/0.1 mm mm/r.u. 0.025 mm/r.u. 0.01 mm/r.u. 0.0025 mm/r.u. µm/r.u. 25 µm/r.u. 10 µm/r.u. 2.5 µm/r.u.
- Spring '08
- Biology, Elodea Cells, ocular reticle