... clone. The growth of a tumor in the body of an individual is, in effect, the formation of a clone of malignant cells. Humans have learned from nature and started their cloning saga also. In one method of artificial cloning used in plant breeding, cells are cut from a plant and placed in a flask with a nutrient medium. The cells grow and divide, forming embryonic tissues that are transferred to soil, where they produce complete plants. Grafting is another method of cloning used in Horticulture. Matching cuts are made in the stems of two plants, which are then fitted together so that their transport systems are in contact. The wounded area heals, and the two stems be ...

... combustion (Hodges 526). Smog has been a problem in coal-burning areas for several centuries. Smog finally decreased when coal combustion was replaced by oil and gas combustion. is caused by a number of different types of pollutants. The first type, particulate matter, consists of solid and liquid aerosols suspended in the atmosphere. These arise from the burning of coal and from industrial processes. Atmospheric particles can scatter and absorb sunlight which reduces visibility. Particles also reduce visibility by attenuating the light from objects and illuminating the air causing the contrast between the objects and their backgrounds to reduce. Not only does i ...

... synthesised by the ribosomes, slide through tiny holes in its membrane into the cisternae, where they remain until they are sent elsewhere in the cytoplasm, or to the cell edge where they are secreted or incorporated into the cell membrane. The membranes of the ER usually form a tightly packed and flattened sac-like structures, that form inter-connected compartments within the cytoplasm. The internal space formed by the membrane sheets is known as the ER lumen. In most cells the ER lumen forms a single internal compartment. The membranes of other organelles are not connected to the ER and appear to form separate distinct compartments within the cytoplasm. The E ...

... to combat the difficulty of treating schizophrenia, several techniques have been devised; psychoanalytic therapy, behavioural therapy, family therapy and most predominantly, drug therapies. Drug therapy is the primary form of treatment implemented at the onset of schizophrenia. The drug clozapine is very effective for many patients who do not respond to initial drug treatment programs and treats both the positive and negative symptoms of schizophrenia (Advokat et al., 1999; Robinson et al., 1999). Moreover, a reduction in negative symptoms has also been noted to occur as individuals are treated with amisulpride and (Danion et al., 1999). The use of newer dru ...

... or resist, any motion of the other surface. For example, there is a friction between a wood floor surface and the surface of a rubber ball when it is rolled across the floor. The floor surface resists the motion of the rubber ball surface. This resistance or friction will slow down the moving object and eventually bring it to a stop. Friction exists between any two surfaces that touch, slide, or roll on one another. Any change in an object’s speed is called acceleration. An increase in speed is called positive acceleration, while a decrease in speed is called negative acceleration, or deceleration. Acceleration can also mean a change in direction as well as i ...

... Billions of people have an on-ramp to the Information Superhighway, and more are finding one every day. The Internet transcends geographical locations, and is the first example of a true global village. Unfortunately for regular users of the Internet, much like the real world, criminals exist on the Internet as well. "Hackers," the computer wizards who use their knowledge for evil, are rampant on the Internet. Sometimes they do seemingly harmless acts, such as just going into a computer system and observing, but at other times, they steal, destroy or alter data. On some occasions, these cyber-felons perform even more malicious acts, such as infecting systems with "v ...

... camera. ROV's have been used for the last thirty years. They have been doing tasks that divers can't, do to Economical and safety reasons. A Submersible is a piece of machinery designed to do an underwater function. Submersible's and rov's are important to Marine biologists so they can study underwater creatures. Geologists can use them to find out more about the evolution of the Earth by studying the ocean floor. The ocean holds some minerals that are becoming scarce on the Earth's surface. If we can set up mining stations under the water it would also provide many jobs. Undersea manufacturing plants would be practical if located close to materials ...

... in this group too. Their are an estimated 3,000 cockroach species in the world. About 55 live in the U.S., and only 4 species ar common household pets. German cockroaches or Croton bugs, are common in the U.S. especially in the northern states. They commonly enter the house in bags or boxes from grocery stores. They tend to cluster in warm moist places around hot water pipes. They stay hidden when they are not eating. Eat Crickets will eat holes in paper or in garments especially those soiled with persperation. They also eat young roots and seedlings, peanuts, garden crops, grain, clothing, and sometimes other insects and even each other. Grasshoppers ar ...

... because of Dr. Percivals' interest in discovering life on mars. Lowell observatory was the first observatory in Arizona. It is a great family attraction with its location being in the popular Tourist City of Flagstaff; the observatory looks over the city. You are guided through a tour and experiments, and also are allowed to use the telescopes they have located on Mars Hill. There are a total of nine telescopes, eight which are at the observatory, of these many of them are historic, such as the 24" Clark Refractor that is 102 years old. The Pluto telescope dome and John Vickers McAllister telescope dome, which is 16" long, are also telescopes y ...

... up in two words; stellar fusion. Therefore one can begin to understand the stars by understanding what fusion is, how it affects the life of a star, and what happens to a star when fusion can no longer occur. The first question one must ask is, "What is fusion?" One simple way of explaining it is taking two balls of clay and mashing them into one, creating a new, larger particle from the two. Now replace those balls of clay with sub-atomic particles, and when they meld, release an enormous amount of energy. This is fusion. There is currently three known variations of fusion: the proton-proton reaction (Figure 1.1), the carbon cycle (Figure 1.2), and the tr ...