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
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
Comment supprimer le dopage dans le sport franais?
Comment supprimer le dopage dans le sport français? Le dopage évoque le mauvais côté du sport. Au top niveau, il y a des sportifs qui pensent ne pas pouvoir s'améliorer sans utiliser de produits dopants. A mon avis, ce sont de véritables tricheurs et ce n'est pas bon pour le sport. J'écris au sujet des tricheurs au top niveau mais aussi au sujet des amateurs qui veulent gagner même s'il faut se doper. Je propose de considérer tour à tour l'étendue du problème, les effets du dopage et les solutions éventuelles. Mais tout d'abord il est nécessaire d'examiner ce que signifie le terme 'dopage'. Il est difficile de définir le dopage parce que la frontière entre l'aide à la préparation des sportifs et le dopage est parfois ténue. Le président du Comité international olympique a spécifié " le dopage est quand la vie du sportif est en danger " mais un ministre australien a réagi en se référant à la définition plus orthodoxe: " ...avoir recours à des procédés ou substances interdits par les textes. " J'entends prêter ce dernier sens au terme 'dopage' dans ma discussion. C'est lors du Tour de France de 1998 que le dopage a été le plus médiatisé. De nombreux reportages à l'époque ont révélé que les équipes Festina et TVM l'auraient même institutionnalisé. Un sondage de 1997 montrait que 92% des français considéraient le dopage dans le
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,
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
Estructura de las grandes disqueras.
Las Disqueras (internacionales): Estructura de las grandes disqueras: La producción musical es una actividad sumamente compleja. Hay que componer las canciones, tocarlas, grabarlas, mezclarlas y masterizarlas, promover el disco, hacerle publicidad y, por último, hay que venderlo. Para poder hacer todo esto de manera eficiente las compañías discográficas están estructuradas en diversas divisiones y departamentos. Las grandes corporaciones del mundo del entretenimiento (Sony, Universal, EMI, AOL- Time Warner y Bertelsmann Music Group) poseen, cada una, un conglomerado de empresas subsidiarias y asociadas, muchas las cuales son sellos disqueros que, a su vez, tienen a otros sellos de menor envergadura asociados a ellos, etc. Esta cadena puede llegar a ser realmente larga, pero en términos de estructura organizacional son los grandes sellos disqueros lo que se encargan de mercadear y vender los discos de los sellos más pequeños. Las grandes corporaciones del entretenimiento están organizadas como cualquier otra corporación: tienen un CEO, un COO, un CFO etc. Luego, cada gran sello disquero que pertenezca a la corporación, tiene un presidente. Por ejemplo, en AOL- Time Warner hay un presidente para Warner Brothers Records, otro para Reprise Records, otro para Atlantic Records etc. Debajo de los presidentes de las disqueras se encuentran los vicepresidentes,
Outline the development of attachments
Developmental Psychology - Key Assessment Task a) Outline the development of attachments An attachment is a powerful bond between an infant and its caregiver. Infants form attachments because they are helpless at birth and so need caregivers to provide for and protect them. There are many long term effects of attachments, for example an attachment gives a foundation for emotional relationships e.g. the infant is learning how to form an emotional or "love" relationship. Schaffer and Emerson believed that infants form attachments by three stages, this argument was based on a large scale study of 60 infants in a working class area of Glasgow over 2 years. The first stage of attachment Schaffer and Emerson believed a child to go through happens when they are 0-6 weeks old, this is known as the Asocial Stage and involves the infant smiling and crying but not directing these emotions at individuals. The second stage of attachment is known as Indiscriminate Attachment and happens when the infant is 6 weeks to 7 months old; this involves the child seeking attention from different individuals. The last stage of attachment is Specific Attachments and happens when the infant is 7-11 months old, this stage shows a strong attachment to one individual, with good attachment to others following afterwards. b) Describe the procedures and findings of one study of individual difference in
The comparison of antibacterial properties of herbal products and standard antibiotics
The comparison of antibacterial properties of herbal products and standard antibiotics Introduction: This is As biology coursework, studying the area of microbiology the main investigation contains the comparison of antibacterial properties of herbal products and standard antibiotics. Aim: The aim is to investigate the effect of herbal products against standard antibiotics on bacteria growth. To examine the extent to which the herbal products (tea tree oil and peppermint oil) and the standard antibiotics (penicillin and streptomycin), reduce bacteria growth of E.coli and M.luteus. This will be discovered by measuring the growth of bacteria on the agar plates and comparing the results. Background information: The proposed aim surrounds the study of bacteria growth and various other products, which can have an affect on the growth rate; it is therefore necessary to look deeper into the topic criteria to get a wider understanding and to help design an appropriate hypothesis. From self-knowledge antibiotics are chemicals produced by microorganisms, which are designed to inhibit and destroy specific pathogens when used at low temperatures. Antibiotics release chemicals, which inhibit bacterial growth and work on a specific action site. The first founded antibiotic was penicillin discovered accidentally by Alexander Fleming in 1928 from a mold culture. It can be
Outline and evaluate one Social Learning Theory explanation of personality development
Outline and evaluate one Social Learning Theory explanation of personality development Bandura believed that an individual's personality was developed as a result of interaction between the individual and their environment. He called this interaction reciprocal determinism, and suggested that people play an active role in determining their behaviour in an environment: they will behave in a certain way that is appropriate for the setting that they are in, but their behaviour may also change that setting. This, according to Bandura's social-cognitive theory, occurs by means of a process of observation and imitation, known as modelling. Modelling is spontaneous and requires no deliberate effort on the part of the learner or the model (the person whose behaviour is to be observed and imitated), and reinforcement is not necessary for such learning to occur. This means that the study explains what the Behaviourist explanation of behaviour could not: the ability to produce or reproduce behaviour without reinforcement. However, although unnecessary, reinforcement will affect the performance of the behaviour; this is known as vicarious reinforcement. Bandura's theory incorporates cognitive factors into its explanation, and for a model's behaviour to be imitated, there must be some internal mental representation of the model. There are five steps to the modelling process. The first
