What Happened to the Mayan's Essay Example | Topics and Well Written Essays - 500 words

What Happened to the Mayan's - Essay Example Maya civilization reached its civilization peak around 750 A.D. After two hundred years, Maya civilization disappeared and collapsed in a mysterious manner. Several theories got made to explain the collapsing of the civilization. Some people believed that the ritual warfare between the Mayans and their neighbors caused their downfall (Childress, 1992). The Mayans flee their homes for survival due to lack of food and the raging war. This also led to another theory of corrupted and faulty officials in their system of power. Others believed that the downfall was as a result of deterioration of their agricultural system. The mystery gets well elaborated by this theory. Mayans relied heavily on agricultural activities. They believed that their ever increasing population resulted to high demand of food and shelter. The worn out soil was not able to support the demanding population. Hence, people got forced to leave their homes in pursuit of greener pasture. Apart from soil deterioration, the region experienced a massive drought (Scholl, 2009). A direct proof of showing that Maya areas experienced a massive drought during the ninth century got discovered at Yucatan region in Mexico. A team of researchers from the University of Florida conducted research at Lake Chichancanab and found reliable evidence to proof Gill’s theory. The scientists got concerned in past climates, and carried their research by extracting mud from the bed of the lake. Shells and seeds got removed from the mud and taken to laboratory for further analysis (Scholl, 2009). The findings in the laboratory indicated that Maya experienced a massive drought during the ninth century. Hence, it provided the much needed evidence in Gill’s theory of drought in

Anesthetic Management of the Patient with Aortic Stenosis Essay

Anesthetic Management of the Patient with Aortic Stenosis - Essay Example Surgery is indicated in many of the cases in order to repair or replace the diseased valve. Therefore, it is the purpose of this paper to investigate the current anesthetic management of this disease, from preoperative to postoperative care. This paper will describe the basic anatomy and physiology of the heart, in particular, the aortic valve. The pathophysiological changes in the aortic valve and the heart will also be discussed. The heart is a hollow muscular organ that is somewhat pyramid-shaped and lies within the inferior mediastinum (3). It is covered by a fibroserous sac called the pericardium, within which pericardial fluid fills the space between the serous and fibrous layers. The pericardial fluid acts as a lubricant to prevent friction during the contraction of the heart. The pericardium is not very distensible, and therefore it strongly resists a large, rapid increase in cardiac size. Hence, the pericardium also prevents sudden overdistention of the chambers of the heart (4). The heart is divided by a vertical septa into four chambers: the right and left atria, which occupy the upper chambers and the right and left ventricles, which occupy the lower chambers. ... Although most myocardial cells are able to perform both these functions, the vast majority is predominantly contractile cells (myocytes) and a small number are specifically designed as electrical cells. The latter, collectively known as the conducting system of the heart, are not nervous tissue but modified myocytes lacking in myofibril components. They have the ability to generate electrical impulses which are then conducted to the myocytes, leading to contraction by a process known as excitation-contraction coupling (5). In order to produce a synchronized contraction, there must be a normal spread of electrical activity within the heart. Depolarization is initiated in the sinoatrial node (SA) node hence it is known as the pacemaker of the heart. It sets the contractions of the heart at a rate of 60-100 beats per minute. From the SA node, the electrical impulse travels to the atrioventricular (AV) node and then propagates through the Bundle of His. From the top of the septum, the wa ve of depolarization spreads in the rapidly conducting Purkinje fibers to all parts of the ventricles (6). Between the atria, ventricles and great blood vessels arising from the heart (aorta and pulmonary artery) are valves, which are made up of cusps or leaflets to prevent backflow of blood, ensuring a one-way conduit of blood through the chambers and to the pulmonary and systemic circulation. There are four valves: two semilunar valves (aortic and pulmonary valves) and two atrioventricular valves (tricuspid and mitral valves). All of these valves have 3 cusps except the mitral valve which has two cusps. Unoxygenated blood from the superior and inferior vena cava and coronary

Marketing Research Essay Example | Topics and Well Written Essays - 2250 words

Marketing Research - Essay Example The Market Research Society of UK gives the definition as: 'the collection and analysis of data from a sample of individuals or organizations relating to their characteristics, behavior, attitudes, opinions or possessions. It includes all forms of marketing and social research such as consumer and industrial surveys, psychological investigations, observational and panel studies (MRS, 1994) 1. Exploratory Design: This is used to discover the general nature of a problem and variables associated with it. It helps in formulating of relevant hypotheses. This uses primary techniques like focus groups, in-depth interviews and observational studies and also uses secondary data, non-probability samples, case analysis and subjective analysis of the resultant data. They are generally qualitative in nature. 2. Descriptive Design: They focus on the accurate description of the variables under consideration. They use questionnaires and surveys. They are used for determining consumer profile and their product usage studies, price and attitude surveys, sales analysis, media research etc. They are quantitative in nature. 3. Causal Designs: They try to establish the nature of relationship between two or more variables under investigation. The direction of the Causal link is very important. The example of their uses may be measuring the effectiveness of advertisement in terms of sales or study of price elasticity of demand etc. Marketing Research Process: The Marketing Research Process can be divided in the following stages: 1. Define the Problem: The first and most crucial stage of the process is defining the problem and providing the necessary information to the Research team which will help them prepare a proper design plan. This stage helps the organization to assess its current position, to define its information needs and to prepare it to make informed decisions about its future. The information provided helps the market researchers with in-depth understanding of the situation. It is important for the market researcher to interview the staff commissioning the study and any other persons who can shed some light on the situation. This helps in forming the Market Research questions, which will lead to forming sub questions. The success of the research depends solely on understanding the problem and defining the questions and sub-questions for which answers are sought by the research. For our case of Hobbit's Choice the basic problem identified is the feasibility of a fine, upscale restaurant featuring the finest entrees, drinks, and desserts in an elegant atmosphere. 2. Decide Research Plan: At this stage the researchers decide in which category his research should fall into. In our case the Hobbit's choice, we have to first find out whether the research will fall into Qualitative or Quantitiative category. In Quantitative category the research is designed to elicit

Current Event -Values, Attitudes & Perceptions Essay

Current Event -Values, Attitudes & Perceptions - Essay Example Current Event on Values, Attitudes & Perceptions: The Definition of Workplace Values Summary The article entitled The Definition of Workplace Values written by Juarez on January 18, 2011 and published by Demand Media, Inc. aimed to determine the factors that define values, attitudes and perceptions in the workplace. As initially averred, these factors are ultimately grounded from cultural orientations that have been specifically examined by Dr. Geert Hofstede who founded five specific patterns in cultural dimensions, to wit: power distance, individualism, gender, avoidance and traditions. Background The author based the contents of the article from Hofstede’s Cultures and Organizations that examined the five dimensions of culture, found to be instrumental in determining expressions and manifestations of values and attitudes in organizational setting. The author aimed to write a concise abstract of each dimension as applicable in the workplace. The study of organizational behav ior manifests the inclusion of diversity in culture to provide a more comprehensive understanding of why and how people behave the way they do. Findings The author clearly averred that â€Å"different cultures have different workplace values along five cultural dimensions, which help us define our own workplace values† (Juarez, 2011, par. 1).