In 2003, the FDA approved generic gabapentin, and it's now made by several drug companies. An extended-release form of gabapentin is available under the brand name Horizant. In 2004, the drug maker Pfizer settled charges for marketing Neurontin for unapproved uses, and agreed to pay $430 million.
Although most diatoms are autotrophic, some heterotrophic or symbiotic species can be found in particular habitats. The living matter of each diatom is enclosed in a shell of silica that it secretes. These shells are marked by minute pores or depressions that allow the living organism access to its environment.iatom (dÄªËÉtÅmË, âtÅmË) [ key ], unicellular organism of the kingdom Protista, characterized by a silica shell of often intricate and beautiful sculpturing. Most diatoms exist singly, although some join to form colonies.
Prepare wet mount of diatoms 2. Observe the organisms and describe their form. Are they centric, pennate or both? The organisms are both centric and pennate. 3. Detect locomotion. What is the body form of motile diatoms? Centric diatoms 4. Observe a single centric form on high power and note the intricate geometric pattern of the cell wall. Can you detect the two halves? 5. Look for chloroplasts. 6. Observe diatomaceous earth and identify pennate and centric forms. Results: Figure 2: Diatoms Lab Study A: Brown algae Procedure: Observe examples of brown algae on demonstration.