To determine the water potential of a potato tuber cell using varying salt solution.
Aim To determine the water potential of a potato tuber cell using varying salt solution. Introduction Osmosis is the diffusion of water molecules from a region where it has higher water potential to a region where it has lower water potential through a partially permeable membrane1. As osmosis is a type of diffusion the same things that affect diffusion have an effect on osmosis some of theses things are: * The concentration gradient - the more the difference in molecules on one side of the membrane compared to the other, the greater the number of molecules passing through the membrane and therefore the faster the rate of diffusion2. * The surface area - the larger the area the quicker the rate of diffusion * The size of the diffusing particles - the smaller the particle the quicker the rate and polar molecules diffuse faster than non-polar ones3. * The temperature - the higher the temperature the more kinetic energy the particles have and so the faster they move. From the diagram4 we can see the process of osmosis in a simple expression. On the right side there is pure water, which has the maximum water potential of 0. Water potential is the pressure created by water. As you can see from the diagram the pure water is pushing its way through the semi permeable membrane at a high pressure. This is its water potential. Water potential is measured in kilopascals (kPa)
Personal Responce to Hamlet
Essay One - Question 1 Personal response to Hamlet and its enduring power of Shakespeare's Characterization Shakespeare's characterization of the characters allows the exploration of ideals that are relevant to all human beings regards of context. In "Hamlet" Shakespeare uses the characterization of Hamlet to examine the human quest for answers about death, duty and the opposing forces of moral integrity and the need to avenge his father. This essay will bring characterization to the forefront in response to how it has shaped the play of "Hamlet". A great deal of characterization of Hamlet is presented through the use of soliloquies. In his soliloquies, Hamlet shows his true feelings of dejection and disillusionment. The soliloquy starts with a supposition, "O that this too too sullied flesh would melt, thaw, and resolve itself into a dew". Hamlet is clearly seen as an escapist as he wants to run away from his duties and responsibilities. Here, he again gives the audience the impression that he is aware of his flaw. His wish to commit suicide is expressed clearly, but he knows he can't do so as it goes against the laws of God. "That the Everlasting had not fixed his cannon 'gainst self-slaughter." Life has become a very futile exercise for him, where nothing seems to be holding his interest anymore. It has becomes very colorless and meaningless. We notice all this when he
The Weakness of the Directory was the main reasons for Napoleons rise to Power. How far do you agree?
The Weakness of the Directory was the main reasons for Napoleon's rise to Power. How far do you agree? On 10th November 1799 the Coup of Brumaire brought about a leader who would bring France's power to the forefront of Europe, a nation feared by all others. The coup was the final of a series of coups between 1797 and 1799. This shows that the Directory was extremely weak which caused Napoleon to rise to power, however there were other reasons as well, such as Napoleon's political connections, his success in wars and his own personal strengths, and the opportunities he creates for himself. The revolution in France was by no means a quick process, taking over ten years before stability was finally regained and Napoleon came to power. During the ten years there were many different types of government all with different ideas, however not one of the governments really affected the peasants, thus the people of France became fed up. Fed up of paying taxes to sort out the massive financial chaos, fed up of paying for pointless wars and so people just didn't care enough to stop Napoleon rising to power, despite warnings about him from Benjamin Constant, who believed he was to self-centred, which through policies in the Napoleonic Code actually turn out to be true. The revolution also created a whole in the army due to many of the military generals who were loyal to the king,
Explain how economists model how an increase in government expenditure can lead to a greater increase in national income.
Explain how economists model how an increase in government expenditure can lead to a greater increase in national income. Ans. National income is the total amount of wealth that accrues to the permanent residents of a country as a result of the production of goods and services within a country during the course of a year. It is important to measure national income because it shows whether the standard of living in a country is rising or falling and it can be used as a means of comparison between other countries. It is also useful to measure income against past income in the same country to see whether the economy is growing or declining. An increase in government expenditure is an injection in the circular flow on income. An injection is an addition to the circular flow of income. The diagram above illustrates some of the injections and leakages in the economy. It is however very important to find out exactly what will be the effect on the economy from an increase in injections. Economists do this by calculating the multiplier effect of the increase in the government expenditure on the economy. The multiplier indicates how many times that the injection of original spending circulates through a local economy. As a result of re-spending, it benefits the local people. The formula for calculating the multiplier effect is 1/(1-MPC). When there is an increase in the
Explain how twin and adoption studies attempt to distinguish genetic and environmental factors underlying the onset of schizophrenia within families. Review the studies and discuss two limitations of this.
Psychology Essay Explain how twin and adoption studies attempt to distinguish genetic and environmental factors underlying the onset of schizophrenia within families. Review the studies and discuss two limitations of this. Schizophrenia is the label applied to a group of disorders characterised by severe personality disorganisation, distortion of reality, and an inability to function in daily life. Symptoms are mainly disturbances of thought processes, but also extend to disturbances of emotion and behaviour. There are two symptom categories - acute schizophrenia characterised by positive symptoms, such as hallucinations and delusions; and chronic schizophrenia, characterised by negative symptoms such as apathy and withdrawal. However, DSM-IV has now moved away from these definitions and classified schizophrenia into three main sub-types: paranoid, disorganised and catatonic. Understanding Schizophrenia More research has, probably, been devoted to trying to understand the nature of schizophrenia than any other mental disorder. Somatogenic approaches have focused on the role of genetic mechanisms influencing the propensity to develop schizophrenia, while psychogenic approaches emphasise the effect of adverse childhood experiences, particularly abnormalities in family interaction in the aetiology of the disorder. Twin studies Twin studies offer a
Compare and contrast the Functionalist and Marxist views of society.
Compare and contrast the Functionalist and Marxist views of society. Sociology has been classified as the last in a long line of emerging scientific disciplines which people have developed and explored in order to make sense of their world. Early theories such as the positivist approach of Comte, the functionalist views of Emile Durkheim and the conflict perspectives of Karl Marx have offered a view of why human beings behave as they do and how they fit together in society. Each theory has to some extent been shaped or influenced by the approach of others and many sociological explanations have comparisons or contrast that can be made. Browne once said "sociological perspectives centre on how much freedom or control the individual had to influence society" He goes on to comment on the two main approaches "structuralism is concerned with the overall structure of society and the way social institutions act as a constraint, or limit and control individual behaviour". Structuralism offers a view of the individual being controlled by the society they live in, Marx and Durkheim are similar in that they can both be described as structuralists, however their individual ideas are somewhat different. Functionalism was developed by Emile Durkheim, he believed like Comte that sociology should be viewed as a precise science and that society should be studied objectively. Durkheim
You have been stranded on a desert island. Describe your first 24 hours alone on the island.
Hannah Greenslade Y10 Coursework Assignment 2 5/11/01 Option 3 Task; You have been stranded on a desert island. Describe your first 24 hours alone on the island. The first thing that hit me was the smell. Even before I opened my eyes, I knew where I was. The tantalizing scent of washed-up waves and bananas all rolled into one. I felt the millions of grains of sand, hot against my fingers and the cool breeze against my face, - a relief from the sweltering sun. I heard the sea crawling onto the sand and, further away, the same monster dashing against the rocks. As I opened my mouth to take in a gulp of air, I tasted salt in my throat. Not the same taste as on Brighton Pier, when you look over into the sea, but a fresh, clean one, as if taking in pure oxygen. Only then, when my four other senses had taken in their share of my surroundings, did I allow myself to open my eyes. I was amazed at how easily fantasy and reality intertwined at that moment. It was like continuing a dream after waking up. As I lifted my eyelids, as the barrier between my imagination and actuality was removed, the accuracy of my prediction astounded me. As I sat up and looked around, I realized that I must have been asleep for a long time, as my sopping wet clothes were completely dry. I could just see the island on which I had been staying, a strip of land on the contrasting horizon. The rubber
Tennessee Williams wrote in a letter that It (Streetcar) is a tragedy with the classic aim of producing a catharsis of pity and terror and in order to do that, Blanche must finally have the understanding and compass
Tennessee Williams wrote in a letter that "It ('Streetcar') is a tragedy with the classic aim of producing a catharsis of pity and terror and in order to do that, Blanche must finally have the understanding and compassion of the audience. This without creating a black-dyed villain in Stanley. It is a thing (misunderstanding) not a person (Stanley) that destroys her in the end." In your opinion, to what extent has Williams succeeded in his aims. Although there are many different viewpoints on a conventional tragic heroine, Aristotle made his views clear that a hero must fall from fortune and power, due to a tragic flaw, allowing an audience to feel catharsis at the end of the play. It can be argued that Stanley causes Blanche's downfall, however, it is clear that Blanche had brought this upon herself by creating a conflict between them and ensures her own downfall by other means such as her promiscuity and flux into fantasies. Williams makes it clear that a misunderstanding destroys Blanche in the end. This misjudgement can be seen in her aggressive teasing of Stanley and her uncomfortable belonging in multi-cultural New Orleans. From the beginning of the play, Williams makes it clear that 'the Kowalski and the DuBois have different notions' with Blanche withholding the Southern Belle attitude of 'Belle Reve'. However, it is clear that Blanche cannot cope with the stark
Was Nicholas II responsible for his own downfall?
Was Nicholas II responsible for his own downfall? Nicholas II acted as an autocratic monarch rather than a constitutional leader, and this was a factor in his eventual downfall and abdication. Other factors included, him leaving Russia in the incapable hand of his wife, Alexandra, who herself was greatly influenced by Rasputin. The 'Holy Man' Rasputin was becoming more and more popular with Alexandra for helping their only son, Alexis's with his haemophilia, and his strange but powerful brand of spirituality certainly affected both Alexandra and Nicholas. It could be argued that Nicholas was himself responsible for allowing the power of Rasputin to extend so far and to influence his political decisions. Historians are in agreement that Nicholas lacked the necessary skills and qualities to rule a rapidly changing country. There were however factors outside of Nicholas' control, including his son's illness, that he could not be held directly responsible for. Indeed Russia was a huge country which was very hard to govern even for the most competent Tsar. One of the first factors which Nicholas was responsible for was his weak character and the fact that he allowed Alexandra to be so dominant. She encouraged him to hold on to his absolute power when a change in his style of leadership may have been a more politically useful tactic. A very significant contributing
Catholic discrimination in Northern Ireland in terms of Housing and Employment
There has been a long history of violence, prejudice, and discrimination between Catholics and Protestants in Northern Ireland, particularly highlighted throughout the 1960s, when Catholics were discriminated against by the Protestant Stormont Government in both employment and housing. Hence, in order to understand in what ways and how much it occurred, both these areas must be investigated. Firstly, one must look at how the Catholics were discriminated against in terms of employment, and to what extent this occurred. In the public sector, Catholics suffered great difficulties being employed, as there appears to have been some bias towards employing Protestants, especially in senior levels of the civil service. For example, in a report by the Cameron Commission in 1969, it is stated, "[As of October 1968] In County Fermanagh, no senior council posts, (and relatively few others) were held by Catholics" and according to the Sunday Times, in the same county, in 1961 "322 of the [370] posts, including the top ones, were filled with Protestants. This shows how during the 1960s, the Catholics in Fermanagh did not have many jobs at a high level in the public sector. This is particularly interesting because the majority of people in Fermanagh were Catholics, hence highlighting the extent of their discrimination. The Sunday Times also wrote that in Derry "of 177 salaried employees,
