... 1989). These threadlike polymorphic viruses are highly variable in length apparently owing to concatemerization. However, the average length of an infectious virion appears to be 920 nm. The virions are 80 nm in diameter with a helical nucleocapsid, a membrane made of 10 nm projections, and host cell membrane. They contain a unique single-stranded molecule of noninfectious (negative sense ) RNA. The virus is composed of 7 polypeptides, a nucleoprotein, a glycoprotein, a polymerase and 4 other undesignated proteins. Proteins are produced from polyadenylated monocistronic mRNA species transcribed from virus RNA. Th ...

... These slow climate changes are caused mostly because of CO2 emissions. Experts now are trying to find new ways to cut back on CO2 emissions and not relying that much on forests around the world. A climate change not only threatens to destroy forests, but as these forests die back they will trigger the release of vast quantities of carbon dioxide stored in vegetation and forest soils. This will add further to the climate change problem. Experts hope that this new way to cut back on these CO2 emissions will not be costly and time consuming. Dry air is made up of about 78 percent nitrogen and 21 percent oxyg ...

... can be assessed by making the appropriate measurements and analyzing the data in a way that shows the connections and their magnitudes. Human population can be closely estimated and the consequences of their activities can be measured. For example, the volume of carbon dioxide, methane and nitrous oxide emissions is an indicator of human's energy and resource consumption. An examination of population size, atmospheric concentrations of these gases and global temperature relative to time and with respect to each other is presented here to demonstrate the relations among these factors. POPULATION GROWTH Many of ...

... easily performed with available instruments and chemicals. Test results may be an instrument reading, and observation of a physical property, or a chemical reaction. Reactions used in qualitative analysis may attempt to cause a characteristic color, odor, precipitate, or gas appear. Identification of an unknown substance is accomplished when a known one is found with identical properties. If none is found, the uknown substance must be a newly identified chemical. Tests should not use up excessive amounts of a material to be identified. Most chemical methods of qualitative analysis require a very small amount ...

... Genetic engineering resulted not from the belief that nature should be manipulated and perfected by humanity. Rather, its principle aim is, as of any other technology, to improve the quality of life for the people of this planet. Therefore, it is necessary to weigh the benefits and consequences of this relatively recent breakthrough and determine in which ways it can be used to humanity's best advantage. This speech will investigate the ways in which genetic engineering affects two important areas in today's society. The first one will be the improvement of the world's agricultural techniques. With an ever-in ...

... energy in a great surplus. It also has no environmental problems and causes no pollutions whatsoever. The problems with fusion are the molecules of hydrogen that are supposed to be fused, electro-statically repel each other at a great force. The only way to create the conditions where the it is possible to force these atoms together and override their repulsion is through enormous heat, this method is called thermonuclear. Even though fusion reasearch still needs a lot of time, there has been some progress in discovering how we can use this. The two fusion reactions that are the most promising both invol ...

... of a manic one. During a depressive episode, the person is sad, irritable, has low self-esteem, negative thoughts, and loss of interest in usual activities. They feel like they’re worthless and hopeless. They also have negative thoughts towards the past and future. Many people go through guilt, crying, or having suicidal thoughts. Unlike a manic episode, the person has lack of energy, and either an appetite loss or gain. Manic depression is a recurrent illness, so a person usually has more than one episode. These episodes can last from weeks to months. They occur whenever and have no certain pattern. Som ...

... a homogenous mixture of two or more substances in a single physical state. Solutions are all around you. All solutions share several important properties. The particles in a solution are very small. In fact, they are atoms, molecules, or ions, which is why you cannot see them. The particles in a solution are evenly disturbed, or intermingled informally on a molecular level. A small sample of one part of a solution. The particles in a solution will not separate no matter how long the solution is allowed to stand under constant conditions. In a solution, one substance is usually considered to be dissolved, or ...

... the population, and the least prevalence among North American Indians, with just half a percent being affected. Psoriasis seems to affect both males and females equally. There are two types of the disease. Type I generally occurs during adolescence, with an average age of onset of sixteen years for females and twenty-two years for males. Type II affects people over sixty years of age. There are several immunological abnormalities associated with psoriasis. Early psoriatic changes occur in advancing lesions before the accumulation of inflammatory cells. These changes are mediated by activated CD4+ T l ...

... is a force between two surfaces that works against movement. One surface tends to work against, 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 positiv ...