Identification and analysis of DNA repair mechanisms Thesis

Identification and analysis of DNA repair mechanisms - Thesis Example In both of these cases, DNA repair systems involve the use of the Mre11/Rad50/NBS1 complex. This project aims to identify and examine what DNA repair systems are present in the cells of Schizosaccharomyces pombe and how these contribute to resistance to treatment with nucleoside analogues. This information should help to provide further insight into the way in which human cells are able to develop resistance to this form of treatment, and perhaps provide some indication of a method to prevent this. Table of Contents Abstract 2 Introduction 4 DNA repair and cancer 6 DNA replication 7 DNA repair 9 MRN Complex 11 Topoisomerase inhibitors 13 Nucleoside analogues 15 Involvement of DNA repair 17 Project System 20 Aims and Objectives 21 References 22 Introduction In everyday life, cells are exposed to external and internal agents that cause thousands of DNA mutations per day. These mutations range from being small, such as affecting a single nucleotide, to large mutations where accurate rep air can be difficult. For the accurate propagation of the genetic information within cells, it is essential that the body has mechanisms of repairing damage in a reliable manner. However, while many methods for DNA repair exist, these are not always successful and mutations can accumulate, resulting in the development of cancer (Helleday et al., 2007). Understanding these processes, why they occur the way that they do and what can be done to influence these is crucial for knowing the way that cancer occurs, and determining methods of treating it effectively. In our modern society, cancer has remained one of the most well studied diseases and perhaps one of the least understood. The fundamental aspects of cancer are damage in the DNA of a cell that results in a lack of control over cell growth and replication, as well reducing the likelihood that cells will enter apoptosis. These cells are able to proliferate well beyond the normal constraints of the tissue that they are in (Loeb and Loeb, 2000). With high levels of replication and low cell death, abnormal cells build up within the body and interfere with body functions. The exact mechanisms that causes these mutations to occur, and allows the cells to break free of the cell control pathway are the focus of much current research into cancer, as understanding these pathways may help to develop treatment or prevent cells from entering this state. Cancer is a disease where mutations in DNA accumulate to the point that traditional controls over cell behaviour can be bypassed, often involving the accumulation of mutations in genes responsible for the birth or death of the cell, as well as controls over the cell cycle (Lengauer et al., 1998). Research indicates that the tumours developed as the result of cancer are heterogeneous (Loeb et al., 2003). Because of this, cancer needs to be thought of as a collection of disease rather than a single disease (Huang et al., 2006). This is an important factor when studying can cer, as it explains why some mechanisms are prevalent in some forms of cancer, but not others. Genetic instability is thought to be one of the driving factors of the development of tumours and this in turn is driven by DNA damage and errors in the replication machinery. However, spontaneous mutation is only one aspect of the puzzle, and the prevalence of cancer development and succession of mutations

How life is influenced by science Essay Example | Topics and Well Written Essays - 250 words

How life is influenced by science - Essay Example Landis confessed of using other drugs but not testosterone in 2010. He was also found out to be guilty of illegal blood transfusion. Floyd was then stripped of his title as the world champion of 2006. Testosterone is a steroid hormone; it is the principle male sex hormone and anabolic hormone. This hormone plays a major role in the development of male reproductive tissues, bone mass and body growth . Its anabolic effects are growth of muscle mass and strength and the simulation of bone maturation and linear growth. Testosterone levels in the body should not exceed the normal level, this is the basis of the testosterone test (Webmed). This test tends to find out the reason for higher performance than usual especially to the athletes who are suspected to be using synthetic testosterone. This was the test performed on Floyd to confirm the allegations. At the end of the day we learn that science has a great potential of being used and at the same time revealing whether it is being misused or not. It is better if we make good use of scientific facts for the betterment of the sports but without taking the advantage of it to pretend to be what we are

Research method information system security management Essay

Research method information system security management - Essay Example Thus, the hypothesis made by Galton was positive, logical, and even refutable, but not strictly scientifically testable. 2. a. The hypothesis can be tested with the help of tomography, scanning the active parts of the brain, when individuals look at various colors. It is also known that colors have more than hundred of shadows. Males and females may be asked to sort cards of different shadows of colors. The experiments afford an objective and public demonstration. c. The hypothesis may be tested with the help of correlational method, and it can be refuted by another scientist. However, the statistics won’t show the real picture in this case, while there is a great amount of variables. So in fact, the hypothesis cannot be called really testable. 3. a. The best way is empirical, simply to see the instructor. Authority – I was told that the instructor is male; his personal documents show that he is male. Rational – the name Jason Daniels points to the fact that the instructor should be male. c. Empirical method is to ask the student about his/her age. You can also consult the papers or ask the teacher – authority. The first method is quicker; the second one can turn out to be more reliable. e. If you do not believe the authorities, who have informed you that Tommy won’t be permitted to ride the roller coaster, the empirical experience (the failure to do it) will certainly convince you of the truth of this statement. f. First we use rational method and count. If you cannot count yet, you may ask the seller or somebody, who can count, thus turning to the authority. Then you may check it empirically and try to by 4 CD’s, thus you will get the best demonstration. 6. The fact that buttered bread always lands butter side down is well known. However, it can be checked empirically. For the purity of the experiment it is preferable to take several slices of

Research Method Essay Example | Topics and Well Written Essays - 3000 words

Research Method - Essay Example Bank of Muscat pays special consideration to the employee welfare and it undertakes a number of training programs in order to build employee skills and to increase competence within its workforce. And this has been the core reason for selecting Bank Muscat as the organization to be researched. As a part of the study the factors that affect the effectiveness of the internal environment of a business setting a number of options of study were available to be analyzed. Out of the variety of the topics which included Performance Appraisal, Leadership Effectiveness and Team Building, the Impact of training on Employee performance was chosen as the topic of the research. The dissertation proposed basically focuses on the extent to which training the employees pays off in the context of the Job satisfaction, Employee Efficiency, Customer Satisfaction and ultimately Organizational performance. The theme of the dissertation would be analyzed on the basis of a research conducted over the internal environment of Bank Muscat. The findings of the research would then be utilized to test the theories developed in the past and to modify them so as to improve their application to the current business scenarios. Moreover the research would serve the purpose of key decision making to managers and would help in improving the understanding of key Human Resource Management concepts. The basic purpose of undertaking the dissertation is to analyze the effect of training on employee’s performance and ultimately on the organization’s success. The outcome of the research will be used deduce the extent of training that is being provided to the employees at Bank Muscat and its degree of effectiveness as perceived by them. The dissertation will also be used to find out the significance of maintaining the internal environment for an organization. Since the dawn

Macroeconomics problems Essay Example | Topics and Well Written Essays - 2000 words

Macroeconomics problems - Essay Example b) Assume the exchange rate changes. Now, ‘1 euro=$1.20’. Showing all work, what does Wanda pay for the wine? What does Pierre pay for the computer? In this case, there is a change in the individual rates of exchange between the euro and the dollar. Currently, ‘1 euro=$1.20’ hence Wanda will spend (1000*1.20) 1200 dollars on a bottle of French wine. On the other hand, Pierre will spend (2000/1.20) 1,666.67 Euros on the purchase of an American computer. c) Which currency appreciated? Explain. Taking a closer look at the two currencies, it is evident that the Euro appreciated against the dollar. According to macroeconomic theory, appreciation of a currency refers to the increase in the value of one international currency against the other in the sense that the appreciating currency is able to purchase more of the other currency (Krugman & Wells 100). In the above mentioned case, the dollar and the Euro are international currency that had an initial exchange ra te of ‘1 euro=$1.08.’ However, there was a change in the exchange rates and the current rate stands at ‘1 euro=1.20.’ This means that the dollar has to fetch more additional units to purchase a single unit of a Euro. This is evident in the case of an American purchasing a bottle of wine and has to pay an initial price of 1080 dollars. Since the euro has appreciated, the American will have to pay a higher price of 1200 for the same bottle of French wine. Consumers using the Euro have a higher purchasing power compared to those using the dollar. SECTION TWO: a) In this section, you will set up a balance of payments table. Please read chapter 26. A BOP has three accounts. You will need to place each item in its proper account and have a dollar value for the total of each account. The table will be in billions. Please indicate, plus or minus, for each number. Credits ‘000,000 ($) Debits ‘000,000 ($) A. Current Account (1) Exports (2) Imports (3) Net Transfers (4) Net Interest Income Balance B. Capital Account (5) Foreign Investments in the U.S. (6) U.S. Investments Abroad Balance (7) Statistical Discrepancies Overall Balance C. Official Reserve Account +2,421 +150 +220 +1150 +250 +30 -2,971 -180 -900 -40 -30 b) What does the official settlements number indicate? Be precise in explaining this. Based on the above table, the official settlements number is -30 and this indicates that the US has an increase in its foreign reserves and that there is also a decrease in the dollar reserves held by foreign central banks (Krugman & Wells 113). The decrease in dollar reserves among foreign central banks count as debits in the Balance Of Payments account. SECTION THREE: a) Under what conditions would the Fed sell government securities? The Fed would sell government securities under conditions such as inflation, employment and national output. Under such cases, the Fed does not have control but can only influence such conditions to its fav or. The Fed can create an effect on such conditions by increasing or reducing the short term rate interest especially through open market operations. Some of the government securities used during open market operations includes treasury bills, bonds and notes (Krugman & Wells 119). The control of money supply offers tangible solutions to the conditions mentioned above. When the Fed is targeting to increase the supply of money in the economy, there will be the purchase of securities. On the

LISTENING JOURNAL COMPOSERS MUSIC HISTORY I Assignment

LISTENING JOURNAL COMPOSERS MUSIC HISTORY I - Assignment Example Johann Sebastian Bach studied orthodox Lutheranism, Latin, Greek, mathematics, history, world geography and German literature. When Johann Sebastian Bach was nine years old he had an encounter with Johann Pachelbel. Johann Sebastian Bach received training on playing the organ at St. Michaels Church. Johann Sebastain Bach went on to play at the Court of the Duke of Weimar. He became master of concerts there. The first work that is to be studied is BWV1052 . In Bachs Harpsichord concierto, the harpsichord is the center piece in the orchestra. The harpsichord transcription was accomplished by adapting the ripieno string parts in order to make this piece emotionally stirring and vibrant. Chords are added in order to give fullness to this composition and there are left hand figurative adaptations in the harpsichord. In the primary and tertiary movement, the left hand of the harpsichordist imitates the ripieno continuo and the right hand of the harpsichordist plays melodically, as if to imitate a violin type sound. The primary and tertiary movements have a similar melodic foundation. The movements occurs in four sections, the commencement demonstrates the them in D minor, which is consequent to the emergence of F major. The second movement follows the leading A minor which is commuted to a C major. The third section resonates to the passive G minor and its accompanying major B flat major. The fourth section gives a recompilation of the prec eding three themes. This is a harpsichord concierto which was originally adapted from a piece made for an oboe. BWV 1053 in E major is a modification of Johann Sebastian Bachs work, the ripieno parts are much less pronounced than in BWV 1052 in D minor and they are given to the tutti venues. The lower tones of the harpsichord are more pronounced in BWV 1053 in E major than they are in BWV1052 in D minor. This adaptation enabled the harpsichord to be the centerpiece of

A reflection on the care of a critically ill patient Essay

A reflection on the care of a critically ill patient - Essay Example Physicians are expected to make proper clinical assessments to determine whether failures are reversible or irreversible to determine the kind of decision to make. Such assessments are useful on determining whether to withdraw treatment, the kind of therapy to apply and many others. There are a lot of controversies that surround the aspects of managing MOF. This is due to the reason that there is no known treatment cause to be taken on patients with the complication. The field lacks proper research and controlled studies that will aid in giving proper care. Instead, the current methodologies in the treatment and care of MOF patients suggest the application of different immunotherapy patients which are often full of mistakes and inapplicable in some cases. Many players in this field also rely on information from laboratories and at times, many have accepted the use of unproved interventions to control the complication. Further, the field of MOF management lacks definitive diagnostic p recisions and this has been a major discouraging factor (Jevon $ Ewens 2007). All the above problems experienced in this field greatly contribute to the current lack of principled and well-defined rules to follow during patient management. This has made it difficult for physicians to realize what should happen when certain situations come up. This is one of the problems that one can identify when working with others in the area. Mostly, individuals apply what they think is right at certain times and expects families to consent to their determinations. Further, complications such as systematic inflammatory response syndrome (SIRS) and multiple organ dysfunctions (MOD) presents complications that are difficult to identify and this has further worsened the situation in ICUs dealing with critically ill patients (Jevon $ Ewens 2007). Despite the above challenges, there have been multiple developments made concerning the issue of MOF. Further research has been able to make progress in det ermining the physiology of SIRS; the leading cause of multiple organ failure. Major pathophysiological mechanisms that are within the inflammatory conditions of MOF have been developed with better definitions of sepsis, SIRS and MODS. Health practitioners have made progress in ensuring the prevention of organ failure by ensuring optimum circulation and faster correction of hypoxia of tissues experienced by patients in high-risks. All these developments have been important in ensuring effective care to the patient. Application of the knowledge from the pathophysiology of SIRS, sepsis and MODS helps in the determination of the best methods as regards the care of patients. This paper will reflect on the self experience of taking care of a patient with a multiple organ failure. It will define the best methodologies for application under certain situations that can complicate the process of care to the patient. My experience as regards this issue is of a 57-yr old man who was found colla psed by his wife. Examination of the man recorded some existence of SIRS, the main observation being spontaneous breathing. Initial management was immediate intubation within the ambulance fifteen minutes after the arrival. He was admitted on hospital where a follow up of examinations were done to ascertain the cause and extent of the complication. A scan of the head was done which showed normal functioning at first instances. However, extensive coronary calcification was noted on the