17.Susan+Maimoun

7/2/2012 > > **Robert Hooke.** > > __Who was he?__ > > Robert Hooke was the most important scientist of the 17th century, he was the first scientist to use a compound microscope. > > __What was his job?__ > > Robert Hooke was a scientist that covered all aspects. Such as biology, physics, astronomy, geology, chemistry and medicine. He also was an inventer. > > __What did he contribute to the__ cell __theory?__ > > Robert Hooke __discovered__ cell division and. He did this by placing a cork slice beneath a compound microscope and found a cell structure. This was shown by the boxes of cells that seperated from one another. > > __Why was his contribution so important?__ > > His contribution was so important because he lead other scientist into using the compound microscope thus, being able to further examine whatever it is their studying. > > **Robert Brown.** > > __Who was he?__ > > Robert Brown was a __Scottish__ Botanist, which was the study of plants. > > __What was his__ job__?__ Robert Hooke's job had involved being a physicist and he was known as a inventor within the 17th century.
 * __Robert Hooke and Robert Brown.__**
 * Who were they?
 * What was their __job__?
 * What did they contribute to __cell__ theory?
 * Why was their contribution so important?

Robert hooke contributed to the sell theory the fact that there was the first to discover that there was a nucleus within the cell.
 * __What did he contribute to the sell theory ?__

his contribution was important because scientists then began to understand that animal cells wernt different from human cells.
 * __Why was his contribution so important?__

__**Different Digestive System**__ The difference between the cows digestive system and the dogs digestive system is that the dogs digestive system has one __simple__ stomach and is known as a Monogastrics and the cow is a ruminant which means that they have a complexed four chambered stomach.

1. what are radioisotopes used for in medicine? Radioisotopes are used in medicine for:
 * Nuclear medicine
 * Radioactivity therapy
 * Biochemical analysis
 * Diagnostic radiopharmaceuticals
 * Therapeutic radiopharmaceuticals

2. Provide 3 examples of a radioisotope and list where it is used. + Thallium- The sulphate was widely used as a rodenticide and ant killer. It is odourless and tasteless, giving no warning of its presence. The electrical conductivity of thallium sulphide changes with exposure to infrared light, and so it is used in photocells +Technitium- Technetium-99 is used in many medical radioactive isotope tests. Mild carbon steels may be effectively protected by minute quantities of technetium, but this corrosion protection is limited to closed systems because of technetium's radioactivity. +Iridium- is used for hardening platinum. It is used in crucibles and other __applications__ requiring __high__ temperatures.

3.choose one example and describe the process. Chemo therapy.
 * Chemotherapy enters the bloodstream and damages dividing cells. Cells in the process of dividing are more at risk of being damaged by chemotherapy. Chemotherapy kills the cell by damaging the part of the control centre inside each cell that makes cells divide. Or it may interrupt the chemical processes involved in cell division// . //

4.List the pros and cons of using radioisotopes in medecine.

=
Pros: Kills cells and cell division of some chronic diseases, such as several types of cancer. One of the best kinds of treatments in medicine, known as the most successful. Has improved over the years to cure chronic diseases.===== Cons: Kills good cells and cells division in the body. When cancer patients recieve treatment, they become very ill. Coming into High levels can cause damage.

__ Mosquito Fish __

1. What is the scientific name? //Gambusia Affinis// //2. diagram of the Mosquito fish.// //3.why was the mosquito fish introduced ?// //The mosquito fish was introduced to control the mosquitos in Maryland.// //4. what are some of the mosquito fish's addaptions?// //Some of the addaptions that a mosquito fish has are thermal addaptions and a resistance to certain pollutants.//