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
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 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
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
How does Shakespeare challenge the conventional role of women within the patriarchal society of Much Ado About Nothing.
How does Shakespeare challenge the conventional role of women within the patriarchal society of 'Much Ado About Nothing'. 'Much Ado About Nothing' is set in a patriarchal society in the late 16th century. In a patriarchal society, men are the dominating sex and women are the oppressed ones. The title of the play also plays a part in showing how things are overly based on sexual relationships between men and women. The play takes place over a course of three days. As so much happens during these three days, the events take place rapidly and can create confusion and misunderstanding. 'Much Ado About Nothing' is a play of wit, deception and slander. It is full of darkness just as much as it is full of light. For Beatrice, a pre-occupation with death arises from her entrapment within a court whose practices she does not admire. She constantly tries to oppose the views of her society with which she doesn't agree. The treatment of gender issues in 'Much Ado About Nothing' would have been central to its impact on Elizabethan audiences. Women, stereotypically, were expected to be silent, gentle, passive and submissive. Independent women were regarded with suspicion and interest. In the first three scenes, the male characters continually criticise the females. Benedick voices the traditional patriarchal ideology through his constant criticism of women's actions and sexual
Does General Haig deserve the title Butcher of the Somme?
Does General Haig deserve the title 'Butcher of the Somme'? In this essay I will discus whether General Haig deserves to be remembered as 'the butcher of the Somme'. General Haig's title of 'the butcher of the Somme' originated after the First World War, when, due to large number of casualties Britain suffered from the war and mostly the Somme. The people of Britain wanted someone to blame. This was a coping mechanism in which people could deal with the loss of the 'lost generation'. Arguably Haig does deserve his nickname. This is because Haig sent thousands of men to their deaths continuously after his war efforts seemed not to be working. For instance 60,000 soldiers died in the first day alone in the battle of the Somme. The reason that so many people died was that Haig ordered his men to walk across no-mans land. They were easy targets for the German machine guns. However Haig assisted Britain in winning the war and although he did so with tremendous loss of life, these men did not die pointlessly. They died to protect their families and everyone else on the home front, and they died to prevent Britain from becoming a German Nation. Haig was also faced with an almost impossible task of winning the war in the quickest means possible. Haig was under constant pressure from the government to have a large victory to boost morale. This factor as well as the fact that
Preparation of propanone from propan-2-ol
Date: 11/10/2011 Exp. No.: 23 Title: Preparation of propanone from propan-2-ol Aim: The aim of this experiment is to prepare propanone by oxidizing propan-2-ol with acidified potassium dichromate solution. Introduction: Ketones and aldehydes are important series in preparation of other compounds and they are commonly prepared by oxidizing alcohol which is done in this experiment. The experiment is an oxidation reaction where a secondary alcohol (propan-2-ol) is oxidized by acidified potassium dichromate. The reaction does not need to be heated but should be placed in an iced water bath as the reaction is highly exothermic. The product is propanone and no catalyst is needed for the reaction. The propanone is serparated from the reaction mixture by simple distillation and is purified using anhydrous cacium chloride. The equation of this reaction is as follow: Chromic acid is produced in situ by adding potassium dichromate (VI) with sulphuric acid and water. K2Cr2O7 + H2O + 2H2SO4 ? 2 H2CrO4 + 2 NaHSO4 The term chromic acid is usually used for a mixture made by adding concentrated sulfuric acid to a dichromate, which may contain a variety of compounds, including solid chromium trioxide. Chromic acid features chromium in an oxidation state of +6. It is a strong and corrosive oxidising agent. Apparatus and chemicals: Apparatus: Quick-fit distillation setup,
