Air pollution Essay Example | Topics and Well Written Essays - 1500 words

Air pollution - Essay Example This paper will discuss air pollution and its various aspects. According to Lbl.gov, there are various major  kinds  of pollution, which produce renowned  effects on the well-being and health  of individuals and the environment as a whole. These pollution types include the discharge of such toxic gases as chemical vapors, carbon monoxide, sulfur dioxide and nitrogen oxides. Once these gases get into the environment, they can become involved in advanced chemical reactions leading to the formation of  acid rain and  smog. Other serious implications include the development of holes in the ozone layer as well as greenhouse effect. The other type of air pollution, which results from fuel combustion for energy, involves the discharge of  particles  (particulate matter) into the air. These particles are tiny pieces of matter, which measures roughly 0001 inches. An excellent case in point of this  kind of particulate matter is diesel smoke. This kind of pollution is also kn own as black carbon pollution. Smoke from burning fuels in industries, homes, and automobiles, is a main source of air pollution. It is also believed that burning charcoal and wood in barbeques and fireplaces can as well discharge into the air significant amounts of soot. Liu explains that the common sources of air pollution include industrial facilities, motor vehicles emissions, household combustion devices, forest fires, mold spores, and pollen among others. According to him, these sources fall into two main categories, namely natural and human sources (15). The natural sources of air pollution include volcanic activity that lead to the production of ash particulates, chlorine, sulfur, carbon monoxide and smoke from wildfires; and dust from natural sources that are usually large areas with no or little vegetation (Chapman and Rob 23). Human sources of air pollution result from human activities that contribute to air pollution. One of the main sources of air pollution that results from human activity is from manufacturing facilities, waste incinerators, and power plants and other forms of fuel-burning heating devices (Gurjar 33). Aircraft, motor vehicles, sound equipments, and marine vessels are the other sources of air pollution from human activities. Military activities such as toxic gases, nuclear weapons, and germ warfare can be the other source of air pollution. Controlled burn practices and chemicals used in forestry management and agriculture are the other sources of air pollution resulting from human activity (Colls 27). Pollutants are the substances that cause air pollution. Pollutants that are of major public health and environment concern include ozone, sulfur dioxide, particulate matter, nitrogen dioxide, and carbon dioxide (Liu 18). Pollutants are classified into two main categories: primary and secondary. Primary pollutants are those that are emitted directly from a process such as sulfur dioxide from manufacturing facilities, the carbon monoxi de from the motor vehicle, or ash from volcanic eruption (Gurjar 36). Example of primary pollutants include carbon dioxide, nitrogen oxides, volatile organic compounds, ammonia, radioactive pollutants,

Enzymes Essay Example | Topics and Well Written Essays - 3000 words

Enzymes - Essay Example Then we will utilize acquired information to examine a given experiment. type of organic molecule that contained gene makeup in biological existence (pg. 50, Barrick, Scientific American). DNA seemed to be an evolved trend later down the centuries. DNA now possesses all information concerning the constructs of the human body, including the structure of enzymes. Enzymes In comparison to DNA, RNA differs in nucleic acid component such as To understand the process of creating enzyme RNA proliferation, we have to explore how they are produced and pinpoint theirpurpose in modern cells. The process commences when RNA polymerase, an enzyme, attaches to DNA strands and copies portions of it. RNA polymerase unwinds and opens the double stranded DNA and reads the nucleotides and matched them up with composite nucleotides that fit. After transcription is done, the messenger RNA (mRNA) is released and capped on each side of the strand to prevent the enzymes outside the nucleus from disintegrating it. These mRNA are photocopies of the DNA. Now when the strand reaches outside, it is quickly read by ribosomes. Ribosomes are composed of ribosomal RNA (rRNA) that essentially deals with the synthesis of proteins. The ribosomes read the nucleotides assembled in sets of three called codons. Each codon sequence has a specific amino acid it pairs up with. Each amino acid is distributed tRNA or transfer RNA. After each codon is translated, the appropriated amino acid are assembled in the order of the codons on the mRNA and fused to together through the process of dehydration synthesis. Then that protein will leave the ribosome while the mRNA disintegrates for its extended exposure to the catalytic enzymes outside the nucleus. The components of the disintegrated mRNA are recycled. That protein can be an enzyme fit for meta bolic activity. For a catalytic activity, the molecules at the beginning of the process are called substrates, and the enzyme breaks them down into different molecules, the products. Almost all processes in the cell need enzymes in order to occur at significant rates. Since enzymes are extremely selective for their substrates and speed up only a few reactions from among many possibilities, the set of enzymes made in a cell determines which metabolic pathways occur in that cell. Enzymes work by lowering the activation energy for a reaction, thus dramatically increasing the