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)
Investigating how language has changed in children's literature; in relation to interaction between children and characters of authority in a boarding school setting.
Contents Contents Page Number Introduction 3 Hypothesis 3 Methodology 3 Initial description of 'The Doctor' 4 Initial description of 'Miss Loy' 4 Initial description of 'Miss Potts' 4 Initial description of 'Albus Dumbledore' 4 Discourse 5 Grammar 5 Semantics 7 Phonology 8 Graphology 9 Speech extract from Tom Brown's School Days 0 Speech extract from School Girl Chums 1 Speech extract from Malory Towers 1 Speech extract from Harry Potter and the Philosophers Stone 2 Comparison between extracts involving exchanges between lead characters, and characters of authority 2 Conclusion 5 References 6 List of Tables Table Number Name of Table Page Number Books chosen for comparison 3 2 Acknowledged frameworks 3 List of Figures Figure Number Name of Figure Page Number Comparison of sentence type in initial description of character 5 2 Number of adjectives in the initial description of character 7 3 Word count demonstrating conversation dominance 3 4 Number of adjectives in the speech exchange 4 Introduction Stories of children at boarding schools have always been a popular genre choice amongst both young and young adult readers. They emulate scenarios that children can identify with, more specifically the relationships between the students and their teachers/head teachers. As a result the language used
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 Importance of Being Earnest - 'We live, as I hope you know, Mr Worthing, in an age of ideals' what are these ideals in the context of the play in Act One, and how does Wilde present them to the audience?
'We live, as I hope you know, Mr Worthing, in an age of ideals' what are these ideals in the context of the play in Act One, and how does Wilde present them to the audience? In 'The Importance of Being Earnest', ideals are a dominant theme, and to that end are critical in determining the actions of the characters. Wilde is typically subtle in his presentation of these ideals, and consequently many of them come to be used as a means for satirising the society depicted. It is important to establish from the outset that Wilde's presentation of ideals utilizes the different characters as bastions for the various ideals, and in doing that subjects them to scrutiny when ridiculing their respective characterizations. One of the most important ideals presented is fittingly one of the first to become apparent; that being the division of the classes and the social status that they entail. On line 1 of the play, Algernon asks Lane, after playing the piano in the adjoining room: 'Did you hear what I was playing. Lane?' Lane's response: 'I didn't think it polite to listen, sir' is indicative of various aspects of his position. Firstly, his butlership requires that he should abstain from partaking in any activity considered to be distracting to his duties, of which listening to the piano would be one. Secondly, his position in society, that of one of the lower classes, demands utter
paper cones investigation
Investigation Report Aim Theory When an object is dropped in air, it accelerates. If it is allowed to drop far enough then it can reach its terminal velocity. This is the maximum velocity of the object during its fall and occurs when the upward force of air resistance acting on the object equals the weight of the object. So at terminal velocity... (P.31, Complete Physics, 1999, Pople, Oxford University Press, ISBN 0-19-914734-5) (P.33, Physics 1, 2000, Cambridge University Press, ISBN 0-521-78718-1) Looking for a formula for air resistance... F = force of air resistance ? = density of air = 1.2kgm-3 c = coefficient of drag for the object / dimensionless A = cross-sectional area of object hitting the air / m2 v = velocity of the object / ms-1 (http://damonrinard.com/aero/formulas.htm) Looking for a formula for the weight of an object... W = m.g W = weight / N m = mass / kg g = acceleration due to gravity, 9.81Nkg-1 (P.55, Physics, 1991, Robert Hutchings, Nelson, ISBN 0-17-438510-2) So putting these formulae together... From the Physics AS course, v = velocity x = displacement t = time so References to the specification Forces and Motion 2821 Forces, Fields and Energy 2824 Aim of your investigation The aim of this work is to investigate the relationship between the time taken for a paper cone to fall and the mass of the cone. Variables
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
Experiment to determine the ethanol content of wine
Experiment to Determine Ethanol Content of Wine The purpose of this experiment is to determine the ethanol content of each of the wines and compare the value determined to the value quoted on the label. These results can then be used to conclude which region is more accurate in quoting the value of the ethanol content of the wine. This experiment takes advantage of the fact that ethanol is less dense than water in solution. The density of ethanol at 20°C is 0.789 g/cm3 while the density of water at the same temperature is 0.998 g/cm3. It then follows that different solutions of ethanol and water will have different densities also, because the relative volume of ethanol increases and water decreases so the density of higher percentage ethanol solutions will be less than the density of lower percentage ethanol solutions. This occurs because water molecules are much smaller than ethanol molecule, meaning more water molecules can "pack" into a smaller volume than ethanol molecules, meaning there is more mass per unit volume of water compared to ethanol, meaning it has a higher density. In this experiment, solutions of ethanol in water were made up, going from 0% to 20%. These were then weighed, and the density of the ethanol was calculated. From this, a graph of percentage ethanol solution against density was made. This graphs later compared to the density of the wine, so
