Effect of Concentration on Osmosis Essay -- GCSE Biology Osmosis Cours

Effect of Concentration on Osmosis Aim To find out how the concentration of sucrose solution affects the mass of the potato chip left in the solution for one day. Prediction I predict that when the sucrose concentration is low the potato chip will gain mass. This is because there will be a higher sucrose concentration in the potato chip so water will go into the potato from the solution. I predict that when there is a high concentration of sucrose the potato will lose mass. This is because there is a higher concentration of sucrose solution in the solution compared to that in the potato chip so water from the potato will go into the solution to even it out. Osmosis is "the movement of a solvent through a selectively permeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane" Osmosis is the movement of water from high water concentration to lower water concentration through a selectively permeable membrane. Selectively permeable membranesare very thin layers of material (cell membranes are selectively-permeable), which allow some molecules to pass through them but prevent other molecules from passing through. Cell membranes will allow small molecules like Oxygen, water, Carbon Dioxide, Ammonia, Glucose, amino-acids, etc. to pass through. Cell membranes will not allow larger molecules like Sucrose, Starch, protein, etc. to pass through. In my experiment I will have a test tube with a potato chip in. The outside wall of the potato chip is selectively permeable so it lets water pass through it but not bigger molecules such as sucrose. In the test tubes I will put different concentrations of sucrose solution. When the concentration of the solution is lower than that in the potato, water will pass through the selectively permeable wall into the potato. Potato cells Sucrose solution The mass of the potato chip increases Sucrose molecule Water molecule When the sucrose solution is stronger outside if the potato chip water will move out from the potato chip into the solution. When the concentration is the same on both sides of the selectively permeable wall nothing passes through it and the mass will stay the same. Plan Apparatus Five test tubes Labels Ruler Scales Tissue... ...hips in each test tube. This would make it more accurate as when I had two in a test tube if one of them was a long way out it made the graph not follow the line well when I plotted the averages. There was one anomalous result at 0.5 mol. I think this was because we patted them dry when we got them out of the test tubes as we did not want to weigh there water on the outside of the potato but I think that we may not have dried them all equally so this anomalous result may have been due to it having water left on the outside of it. Also the potato itself was not from the same part of the potato and was not exactly the same size, although I did try to cut them to 36mm each. I could also try the same experiment but with different volumes of cell tissues and see if the percentage change differed with a bigger and smaller surface area. I could now investigate the smaller range near to 0.25 to see the sucrose concentration equivalent to the potato. Finally, I could extend the experiment to a more exact level by looking at the potato cylinders under a microscope, then I would be able to see the cells in greater detail and draw some more observational results.

Reflection on mental health nursing Essay

This is a reflective essay based on my attendance at a multidisciplinary team (MDT) meeting whilst on my two-week placement at a local mental health day hospital. The aim of this essay is to discuss the importance of the multidisciplinary team within the mental health environment and discuss factors that can influence the success or failure of multidisciplinary teams. Mental health teams generally comprise of psychiatrists, clinical psychologists, nurses, occupational therapists and social workers, but other therapists such as family therapists, psychotherapists and counsellors might also become involved in the care of the patient (Perkins & Repper 1998). Multidiscipline involvement is important within mental health nursing as people with mental health problems have multiple needs, so a variety of expertise is required to meet the needs of these people (Darby et al 1999). Multidisciplinary mental health teams can been defined as: â€Å"A group of practitioners with different professional training, employed by more than one agency, who meet regularly to coordinate their work providing services to one or more clients in a defined area† (Ovretveit,1993: 9 cited in Onyett 2003) The advantage of a multidisciplinary team approach is that all professionals work together by collecting the facts and by bringing information together, to obtain as complete a view as possible of the problems of each individual patient. In doing this they are able to make sure that the proper range of treatments are used in a properly planned way (Onyett 2003). One of the disadvantages of a multidisciplinary team is that problems can be encountered when different professionals work together, there can be unclear goals, lack of direction and poor leadership (Darby et al 1999). In order to structure this reflection I have chosen Gibbs (1988) as the model to help with my reflective process. This model comprises of a process that helps the individual look at a situation and think about their thoughts and  feelings at the time of the incident. Reflective skills help us to think about what could have been done, so that if a similar situation occurs again the experience gained can be used to deal with the situation in a professional manner (Burns et al 1997). To enable me to use this situation for my reflection the patient will be referred to as â€Å"Kate†. This is in order that her real name is protected and that confidentially maintained in line with the NMC (2002) Code of Professional Conduct. Description Kate is a 66-year-old lady, retired from her job as a nurse 10 years ago. She has lived alone since the death of her husband 7 years ago, and has one very supportive son who lives locally and visits 2-3 times a week. Kate was referred to the hospital by her doctor after presenting with an 18-month history of memory problems and it was decided that she should attend the day hospital for a period of six weeks to be assessed and to be involved in therapeutic activities whilst there. Whilst attending the day hospital she was observed, and found to be repetitive with obvious evidence of fabrication, very disorientated, with poor concentration and very poor short-term memory. The consultant asked the mental health nurses to assess Kate and tests indicated that she may be suffering from a moderate degree of dementia. Dementia is a mental disorder caused by structural changes in the brain and affects around ten per cent of people aged over sixty-five (Newell & Gournay 2000). An MDT meeting was then arranged to discuss the package of care needed for this lady, to enable her to continue living safely in her own home. The Consultant chaired the meeting by bringing the team to the attention of Kate’s medical history and the problems herself and son had been experiencing. He felt she would benefit from medication to help her memory problems. The community psychiatric nurse (CPN) then discussed to the team the concerns of Kates son, he had informed her that Kate is wandering at inappropriate times of day and rarely remembering to eat, she is also regularly forgetting to turn off the taps and gas appliances in the house. He is very concerned for the safety of his mother. The occupational therapist suggested she visit to assess Kate’s safety in her home concerning these issues. The social worker discussed the possibility of home carers but the mental health nurse who knows Kate well, tells of her concerns that Kate is never at home. The social worker suggested a case meeting involving the son who could possibly ensure that his mother takes her medication regularly and to try and ensure that she remains at home until the carers arrive. It was agreed that if this did not work or was unsuitable for Kate or her son, any problems identified could be discussed and resolved at a future MDT meeting. Feelings I felt very comfortable and very accepted within the MDT meeting. The atmosphere was friendly and relaxed and everybody there seemed to have something to contribute. Everyone was encouraged to participate and I felt that I could have contributed to the discussion if I had known the patient better. I feel they would have listened to my ideas and not dismissed them due to me being a student. Everybody communicated well with each other and had the best interests of Kate in mind and so discussions were made until the best outcome was achieved for her. This demonstrates the benefit and importance of communication within a team and how all contributions within meetings should be valued (Perkins & Repper 1998). Evaluation There are many positive aspects of this particular MDT they all worked well together as a team with the same goal in mind. The team discussed all the different options available and all the problems that might arise and looked  to the future to discuss further meetings to assess if the package of care put into place was suitable. I found it very interesting to see a MDT in action and witness the teamwork between different disciplines. With the help and support provided by her son and the MDT Kate will hopefully be able to remain living in her own home, safely for as long as possible. The disappointing aspect of this case is that if Kate is never at home when the CPN, and carers arrive this can have a negative impact on the package of care put in place, and residential care may need to be considered at a later date. Analysis This particular mental health team worked extremely well together, the consultant chaired the meeting and was the leader of the meeting. Onyett (2003) suggests that the presence of a clear team leader is associated with team effectiveness. The NMC (2002) states than nurses should work in a collaborative manner with healthcare professionals and others involved in providing the care for the patient, and recognise and respect their particular contributions within the care team. The case of Kate is evidence of a multidisciplinary team and health professionals working together and breaking down barriers to provide the correct package of care for this individual. Kate’s illness not only affects her but also members of her family who are trying their best to support her, Darby et al (1999) states that theses difficulties can have a profound impact not only on the life of the individual who experiences them, but also on the lives of those around them. The MDT were fully aware of this and so arranged a case meeting with the son so that all the different options could be discussed. Kate wanders off alone unaware of the time of day or night. Whilst someone  with dementia wandering off and getting lost on a cold night is clearly in danger, little can be done to make a person stay indoors against their wishes. Perkins & Repper (1998) discusses the difficult balance between the wishes, demands and rights of the individual to live as they wish and professional codes of conduct which impose upon the health professionals a â€Å"duty of care† to ensure the safety of the individual. Conclusion It can be seen from this MDT meeting that clear leadership and good communication between members of the team is vital to ensure they come together with a clear understanding of the outcomes to be achieved and equally equipped with all the information available to overcome patients’ individual problems. Team working forms the basis of mental health nursing and can influence the success or failure of the care and treatment the patient receives. This effective team has the potential to achieve positive outcomes for both Kate and her son now and in the future if needed. Action plan If I find myself in this type of situation again, I would be more confident in participating in the MDT meeting. I have learnt from this situation that good teamwork and communication between each other is vital to the outcome of the package of care decided. This reflection has highlighted the need to increase my knowledge and understanding of the multidisciplinary team and the importance of the outcomes of these meetings and how they can affect the patients and family’s quality of life, which will help me to think very carefully about the decisions I make concerning patients care in the future. I will address this learning need by working closely with my mentor and other multidisciplinary team members and by reading relevant literature. As a student I am aware that there is a lot more to learn and with more time and experience and with the help of my mentors I will be able to increase my knowledge and understanding of how different disciplines work together. References Burns, S. Bulman, C. Palmer, A. (1997) Reflective Practice in Nursing – The growth of the professional practitioner. London: Blackwell Science. Darby, S. Marr, J. Crump, A Scurfield, M (1999) Older People, Nursing & Mental Health. Oxford: Buterworth-Heinemann. Gibbs, G (1988) Learning by Doing, A guide to teaching and learning methods. Cheltenham: The Geography Discipline Network. (GDN). Newell, R. Gournay, K (2000) Mental Health Nursing – An evidence based approach. London: Churchill Livingstone. Nursing and Midwifery Council (2002) Code of Professional Conduct: London Onyett, S. (2003) Teamworking in Mental Health. Bristol: Palgrave Macmillan. Perkins, R. Repper, J. (1998) Dilemmas in Community Mental Health. Oxon: Radcliff Medical Press Ltd.

Mitchell’s Gone With the Wind

Margaret Mitchell’s celebrated novel Gone With the Wind weaves a wonderful love story that happened in the eve of the American Civil War. Almost everyone has known the two lovebirds named Scarlett O’Hara and Rhett Butler, whose tempestuous love affair and memorable lines popularized in the film version of the novel. The Civil War background, the pathos of the South’s defeat, the poverty and suffering (with its clear parallels to the 1930s depression) and eventual economic triumph of Scarlett, so cheering to readers with little to feel cheerful about, and then the â€Å"realistic† ending with its bitter-sweet parting of Rhett and Scarlett, contained more excitement than a dozen lesser novels. All readers are enthralled about the details of how the Southern life runs, the humor, the dozens of colorful minor characters all presented in competent and flowery prose. Definitely, it is a must-read novel for love story fanatics who don’t mind to get a strong dose of American history to go along with the love affair of the main characters. Actually, Gone with the Wind is not solely a love story because it is considered as a coming-of-age story of Scarlett O’Hara. At the novel’s opening in 1861, Scarlett O’Hara is a sixteen-year-old Southern belle, when it concludes in 1873 she is a twenty eight year-old woman. Millichap (1994) recounted that in the twelve year span of the novel, Scarlett â€Å"experiences Secession, Civil War, and Reconstruction, as well as romance, love, marriage, and motherhood. Scarlett lives through the adolescent trauma of American culture, which is matched by a traumatic personal history as much or more tumultuous†. She was fuelled by her own life and that’s why â€Å"Mitchell created one of the most arresting tales of troubled adolescence in American literature and in so doing created a novel which will continue to captivate teenagers and fascinate their teachers well into the next century†. The relevance of this novel in American history is that Scarlett is caught up in the historic period like the Secession, Civil War, and Reconstruction that we all studied in our history class. When the Southwest was defeated during the Civil War, the huge plantations were destroyed and the slaves were freed. This prompted plantation owners to suffer greatly from their downfall. The American Civil War also interrupted cotton supplies that had disastrous effects in the United States. The Great Hunger of the 1840s was a time of agrarian crisis and industrial slump. We can all experience these parts of American history as readers go through the life of Scarlett O’Hara. By reading the novel, we can see the events that transpired during these periods through the eyes of a woman struggling to redeem herself from all the difficulties brought about by the events that happened. In this way, readers can learn about American history when reading the novel as these were intertwined with the life of the heroine in the Mitchell’s novel. For younger readers, Scarlett O’Hara’s development from teenaged girl to mature woman proves as fascinating now as it did when the book was first published in 1936 or when the movie first appeared in 1939. The particular, indeed peculiar energy of the story proceeds from Mitchell’s own girlhood, adolescence, and young adult life. During these years she heard the family legends of the Civil War era into which she projected her own development toward womanhood. The novel combines Mitchell’s family and personal romances with historical facts to create powerful and popular fiction. Also, it was a great hit during the time of its publication because many people can relate it to the Great Depression that happened in the 1920s. As Beye (1993) writes: Gone With the Wind was published in the depths of the Great Depression. The years of the Depression were followed by the Second World War. It is not hard to see how it spoke to an American audience of that period. The economic and social disaster that the Civil War brought to the white aristocracy of the old South is a good metaphor for the economic and social dislocation that millions of ordinary Americans experienced between 1936 and 1946. Suddenly vast numbers of people were devastated by hunger, homelessness, and joblessness. Often, however, they were also freed from middle class gentility; women especially were freed from propriety; classes were mixed up; immigrant groups became richer and freer in the experience of America; war made women independent of men as never before. Reading the book was an awe-inspiring experience, although there are parts that can be dragging. All in all, the love story was quite enthralling indeed and readers can both enjoy the plot of the story and take a slice of American history without a sweat. Works Cited Beye, Charles Rowan. â€Å"Gone with the Wind, and Good Riddance, Southwest Review 78.3 (Summer 1993): 366-80. Millichap, Joseph R. â€Å"Margaret Mitchell: Overview†, in Berger, Laura Standley (Ed.), Twentieth-Century Young Adult Writers, 1st ed. Detroit: St. James Press, 1994. Mitchell, Margaret. Gone With the Wind.

Civil Engineering- Retaining walls Essay Example | Topics and Well Written Essays - 250 words

Civil Engineering- Retaining walls - Essay Example This force translates into moment by multiplying it by the moment distance, M of each section (Craig 166). M is the distance from the ‘toe’ of the wall to the centre of gravity of each section. Centre of mass acts at â…” of distance from the apex to base or â…“ of distance from the base to apex, for triangular sections. Centre of mass acts at the centre of section, for rectangular sections. Summation of the individual sections’ resisting moments gives the overall resisting moment. The force, Pa, acts at a distance â…“ H since the effective pressure region is triangular. The resulting moment is Pa multiplied by â…“ H. the factor of safety Fsot is the ratio of moment due to resistance to the moment due to net active thrust. The sliding resistance is the ratio of (the reaction force of the wall multiplied by the coefficient of sliding, 0.44) to the driving force offered by the soil to the wall (Craig 189). The reaction of the wall is the summation of the wall’s section forces, in his case 23.3 k. In question 2, the angle Ï• is 26o, and c is still zero; therefore, the wall exerts a triangular pressure distribution region. Given both the active and passive pressure co-efficient, Ka and Kp respectively, calculate Pa and Pp. The passive pressure is due to the resistance of soil to lateral forces. Ka and consequently, Pa are calculated as in problem 1 while Kp = [(1+ sin Ï•)/ (1 - sin Ï•)]. Pp = Â ½KpÃŽ ³ H2– 2c (√Ka) (H) but this reduces to Pp = Â ½KaÃŽ ³ H2 since c is zero (Craig 166). The factor of safety, Fsot, as in problem one is the ratio of the summation of resistance moment by the wall to moments due to active thrust of the soil. The factor of safety due to sliding limit is the summation of wall section’s reaction force multiplied by sliding coefficient, 0.45 divided by the thrust force of the soil to the

Econometrics assignment Example | Topics and Well Written Essays - 1250 words

Econometrics - Assignment Example In this case, the cumulative probability is 0.7049. This implies that the coefficient is at least -20 (100 - 70.5) = 29.5% of the time. We now test the probability that the obtained t-score with 11982 degrees of freedom is greater than 0.5385. Using the t-tables, we obtain the one-tailed p-value as 0.2951. Since this value is greater than the default level of significance (0.05) for the test, we fail to reject the null hypothesis. We establish that the value of the coefficient is not greater than -20 at the 5% level of significance. From the equations, we now determine whether students whose home language is not English are more or less likely to read fiction compared to those who read fiction at home. Firstly, we realize that the introduction of the variable â€Å"fiction† in the second model improves the value of R2 from 0.02 to 0.204. This indicates that the variable alone accounts for (0.204 – 0.02) = 18.4% of the variability in the reading scores. We take the â€Å"odds ratio† approach. We apply the formula: Again, nearly everyone in the sample who does not speak English at home reads fiction. The ratio of fiction readers from the two categorizations is 1:1, implying neither of the groups commands higher fiction reading likelihoods than the other. In the variable â€Å"fiction† were to be split into constituent components based on the likert scale rankings earlier used, such that â€Å"fict5† indicates â€Å"I like reading fiction very much† and so on, we would have to change the variable responses from scale to dummies. We assume that if an individual who, say responding to â€Å"fict5† mentions that they â€Å"do not like reading fiction very much† will be accorded 0 for the response, and 1 for â€Å"I like reading fiction very much†. The variable â€Å"fict3† is the transition between responses that affirm or disaffirm the proposal/ question. This is highlighted by the fact that the scale used has 5 points, providing for

Corporate Communication Strategy-Toyota case Essay

Corporate Communication Strategy-Toyota case - Essay Example The unintended acceleration was attributed to floor mat issues, brakes and sticky gas pedal. The company has since recalled nearly 8 million cars of different models that were deemed to have potential problems with gas pedal mechanism which could lead to unintended acceleration (McKenzie & Scott, 2010). 2. Environmental scanning of the company Toyota has enjoyed an unblemished reputation within the auto industry. In the fast transforming business dynamics, the various environmental factors become crucial paradigms to maintain competitive advantage within the industry. PESTLE and SWOT analysis become vital tools for firms to identify and evaluate elements that can help them compete and succeed in the highly competitive business environment (Burnes, 2009). They promote the wider understanding of socio-political environment within which the firms operate. They were conducted to understand Toyota’s market position prior to the crisis and how it was impacted in post crisis period. (Refer to Appendix A) 2a. PESTLE analysis for America In the current environment of rapid globalization, practice of international businesses is considerably impacted by the different political, economic and legal systems of nations (Hills, 2004). The businesses therefore need to become more flexible and adapt to the changing technologies and work environments. PESTLE analysis of Toyota has been conducted for America because the case focuses on the Toyota’s American market and the performance and quality of its various models in America. PESTLE has emerged as critical issues that need to be incorporated within the business strategy when firms expand across globe. 2a.1 Political environment America is one of the largest democratic states of the world. The public is hugely empowered with information and the socio-political environment promotes proactive participation of people in issues which affect them. Thus, businesses need to be more accountable in their actions and take in to account the expectations of the people at large. The sticky pedal case of Toyota had drawn more public attention towards the firm undermining it’s hitherto brand reputation of quality, dependability and value. 2a.2 Economic It is a very important factor because the market is driven by the demand and supply that is mainly dependent on the buying capacity of the consumers. It has big market in America. Despite the current environment of recession, the networking solutions have become the critical part of industrial success and therefore, an intrinsic part of business strategy. Toyota therefore has huge economic stake in the American market and needed to restore public trust by responding favourably to the crisis situation. 2a.3 Socio-cultural paradigm There is huge socio-cultural diversity amongst the masses. With multi-cultural society, the demographic factors are vital ingredients that have huge cascading effect on the market. The demographic changes vis-a-vis population s ize, age distribution, gender ratio, income group etc. have immense influence on the changing consumer preferences and consequently on the profitability of the firm. Kotler et al (2007) emphasize that in the fast changing global business, demographic compulsions have significant impact on market position and therefore, they need to become intrinsic part of the market strategy of the

Read short story Essay Example | Topics and Well Written Essays - 250 words

Read short story - Essay Example This side of the valley is symbolic of life and has a seemly association with Jig, while Hemingway links it to her desires to settle down permanently, have the child, and be in a loving relationship. However, the valley’s other side is the opposite. It is sterile, barren, bleak, and a desert landscape that has no life or animation present (Hemingway 12). This side of the valley is representative of abortion and its unwanted and deadly consequences. It is also, perhaps, symbolic of the meaningless and empty nature of the earlier relationships between the couple. In the story, it is as if the author takes the two characters and places them in a landscape, which seems to exemplify the decisions they will have to make, as well as, the major differences that stand between the two of them as individuals. The author deftly and subtly utilizes more than one aspect of the setting in the story to show significant things about what it means, which, in this case, is the valley and its two contrasting