Phylum Amoebozoa This group contains amebas and other protozoans that move by using their mobile extensions of the cytoplasm called pseudopodia. Slime molds cause very little damage.
Without their photosynthetic activity, coral reefs and all that depend on them would cease to exist! Slime molds have been found all over the world and feed on microorganisms that live in any type of dead plant material. Finally, several species of Leishmania that are transmitted by the bites of sand flies cause serious diseases in humans that may affect the liver or spleen or cause disfiguring lesions of the mucous membranes of the nose and throat and skin ulcers.
These relationships may be mutualistic both partners benefitcommensalistic one benefits, while the other is neither helped nor harmed or parasitic the parasite benefits; the host is harmed.
When conditions are right, the pseudoplasmodium stops migrating and forms a multicellular fruiting body. However, in tropical areas they are also common on inflorescences, fruits and in aerial situations e. General protozoan characteristics include: With over 64, living species, protozoans show a fantastic diversity of forms.
The parasite reproduces asexually through longitudinal fission, but unlike many other protozoans, the organism does not have a cyst stage as part of reproduction.
This makes slime molds ideal tools for scientists studying mitosis, the process of nuclear division. Some species have thin, needle-like pseudopodia, while others have ones that form a netlike mesh around the organism.
The Slime Molds Slime mold is a broad term describing fungus-like organisms that use spores to reproduce.
Some of the cells become spores that disseminate, while the rest form stalk cells whose only function is to raise the spores up into the air to be more easily caught in air currents.
Phylum Foraminifera This slide shows two exoskeletons, or tests, from a group of marine protozoans called foraminiferans.
Trichomonas vaginalis is a sexually transmitted parabasalid protozoan that causes urogenital tract infections. When the plasmodium runs out of food, or environmental conditions become harsh, they often form elaborate often beautiful fruiting bodies made mostly from calcium carbonate and protein that produce spores that allow them to move to a new food source.
Amebas are naked protozoans often found in shallow, clear water. In fact, some of the most important diseases of humans and domestic animals are caused by parasitic protozoans! The parasite which causes amebic dysenteryis contracted by drinking water contaminated with human waste or by eating raw vegetables washed with such water.
In addition to a number of complex organelles, many ciliates have a sculptured, rigid outer covering called a pellicle. Although slime molds were formerly classified as fungi, they are no longer considered part of this kingdom.
Most slime molds are smaller than a few centimeters, but some species may reach sizes of up to several square meters and masses of up to 30 grams, and many have striking colors such as yellow, brown and white. These pseudopodia come in a variety of sizes and shapes, the most common of which are rather large and blunt.
Embedded in the pellicle are the cilia plus a number of thread-like structures called trichocysts. For example, Trypanosoma brucei causes African sleeping sickness in humans and a related disease in domestic animals. Several parasitic species can cause serious problems for aquarium fish and fish in farm enclosures.
Classification of the Protozoans Although the protozoans used to be lumped into four groups based on their type of locomotion i.General Microbiology Miramar College Biology Proteus mirabilis Negative No extraneous books, folders, purses, or book bags on lab bench top.
8. Report all spills and accidents.
Be prepared to identify the microbe as the instructor requests. (See Hazardous Waste. Microbiology ^ ] v P Æ Ä Å Æ Major Unknown Report Suzanne Ricca - Lab #22 Gram (+) Unknown #13 – Bacillus subtilis Gram (-) Unknown #13 – Proteus Unknown Report.
See the lab handout Taste Reception in Flies (Biology Department, ) for details. RESULTS.
Fly lab report p. the lab groups together, there was a major difference in the response of flies to the sugars and to saccharin (Table 1). When all the sugars were considered together, this difference.
1 HOW TO WRITE AN UNKNOWN LAB REPORT IN MICROBIOLOGY GENERAL Unknown reports in microbiology are written in scientific format. Scientific writing is written differently from other types of writing. The results of the exercise or experiment are what are being showcased, not the writing.
Biology Lab Report 1 Proteus Mirabilis Essay Proteus mirabilis The genus Proteus, according to Bergey’s Manual of Determinative Bacteriology, is a group of straight rod Gram negative bacteria around μm in diameter and μm in length.
Zoo-lab. Expand page menu. Skip to page menu. Lab 3: Protozoans Welcome This slide shows several stained specimens of Amoeba proteus (Proteus was a Greek god that could assume various forms). smear appear normal, notice the cell infected with an intracellular feeding stage of the parasite called a trophozoite (1).
After feeding on the.Download