Investigating the concentration of the solutions inside the vacuole of a potato cell. :: essays research papers

Osmosis Investigation We are trying to find out what the concentration of the solutions is inside the vacuole of a potato cell. We will investigate how the mass of the potato chips change in different sucrose solution concentrations. We will use osmosis to do this. I will be measuring and controlling many different variables, these include; - The dependent Variable – Weight of potato chip Independent Variable – Concentration of sucrose Control Variables consist of; - 1.  Ã‚  Ã‚  Ã‚  Ã‚  Temperature 2.  Ã‚  Ã‚  Ã‚  Ã‚  Surface area of potato 3.  Ã‚  Ã‚  Ã‚  Ã‚  Volume of sucrose solution 4.  Ã‚  Ã‚  Ã‚  Ã‚  Same time for each potato chip submerged in solution 5.  Ã‚  Ã‚  Ã‚  Ã‚  Potato chips all from same potato The effects on the dependent variables all differ; here is how the main variables in my experiment work out. Variable  Ã‚  Ã‚  Ã‚  Ã‚   Effect on Dependent Variable Surface area of potato chip  Ã‚  Ã‚  Ã‚  Ã‚  The greater the surface area the more water it will be able to absorb Same chip from the same potato  Ã‚  Ã‚  Ã‚  Ã‚  The genetic make-up will be the same and therefore the partly permemble membrane will be similar Time left in the solution  Ã‚  Ã‚  Ã‚  Ã‚  The longer spent in solution the more that is absorbed Coating on the potato chips  Ã‚  Ã‚  Ã‚  Ã‚  If not rinsed off and dried after a certain period of time the chips will form a coat of sugar thus decreasing surface area Quantitative prediction I predict that the effect of changing the sucrose concentration will be that as the concentration of the sucrose solution increases, first of all the mass of the chip will increase, and then the change in mass will gradually decrease until mass is lost and this mass loss will gradually increase in amount. Because when the sucrose concentration is low, the concentration of water outside the cells of the potato chips will be greater than that inside, and therefore water will osmosis into the cells of the chip which will gain mass. As the concentration of sucrose increases the concentration of water outside the call will eventually become less than inside the cells of the chip and mass will be lost.   Ã‚  Ã‚  Ã‚  Ã‚  Dependent   Ã‚  Ã‚  Ã‚  Ã‚  Variable   Ã‚  Ã‚  Ã‚  Ã‚   Inside the cells Outside the cells Dilute solution  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Concentrated solution   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚   Higher water concentration Low water concentration Key: = Sucrose particle = water molecule = osmosis = partially permeable membrane In the higher sucrose concentration solution, the net movement of water (osmosis) is to the outside of the cell, and the chip will lose mass, the cells will become plasmolysed. The chip in a low concentration of sucrose solution, is the opposite of the diagram above, in that the water osmoses into the cells of the chip, mass it gained, through osmosis of water into the plant cells, the cells will become turgid.

Othello By William Shakespeare †What is the dramatic significants of the first scene? Essay

Q. What is the dramatic significants of the first scene? A. During his reign as literature king Shakespeare wrote the play Othello. The play is based mainly on the conflict between Italy and Cyprus in the early 1600’s; Shakespeares characters also reflect this troubled time. Act one Scene gives the reader their first glimpse as to what the play might represent. The scene starts in the middle of an argument between Iago and Rodergio somewhere in Venice. They are arguing about Othello marriage to Desdemona (the daughter of Brabantio a important Venetian senator.) Roderigo questions Iago about his lack of knowledge surrounding this event. From the language used we know that Iago has taken money from Rodreigo to keep track on Desdemona as Roderigo is secretly in love with her. Iago has failed by not knowing about Othellos secret wedding to Desdemona. â€Å"That thou, Iago, who hast had my purse as if the strings were thine shouldst know of this.† The fact that this scene begins mid way through an argument is very significant as this would of grabbed an audiences attention in the early 1600’s as there were no microphone and no proper way of showing the audience that the play has begun. In starting this way the play has interested the audience and left them with the question, what is this argument about? Iago is what was known as during the time of Elizabethan theatre a Machiavliel villain. This means the audiences know this character is untrustworthy; he is only really out for himself. Iago wants Power and money. Through out this scene money terminology is used to a great affect. This shows that money and status was very important at this time. â€Å"By debitor and creditor; this counter caster, he, in good time, must be a lieuitenant be,† Iago is a very bitter man he wants to take his own revenge upon Othello even if this means Othello will truly suffer the consequences as he was not given the top job, which he believes he deserves. However Othello gave the job to Michael Cassio who we not yet been introduced too. Iago makes cruel comments about Michael Cassio stating he is all talk and no action on the battlefield this is highly insulting. Iago is also very cruel when talking with Roderigo about Othello he is very racist and patronizing Othellos name is never used throughout this scene he is referred to as â€Å"The Moor.† I believe this to be very rude and pure jealousy on Iagos part. However this does not really matter at this moment as Othello is highly regarded within this society. Within this scene Iago clearly shows he is not someone to be trusted. He is very ironic with that the fact that he shows Roderigo and the audience he is who he is and no one can change that about him. At this point the audience sense the Irony of this particular line. He is admitting he cannot be trusted. â€Å"I am not what I am† Iago decides that one of the ways in which to seek his revenge upon Othello is by telling Brabantio (Desdemonas father) about her secret wedding to Othello. However Iago is very cunning as he talks Roderigo into calling upon Desdemona father and telling him the truth, as obviously he doesn’t want this crime to be traced back to him this plan makes perfect sense. â€Å"Call up her father, Rouse him, make him after his poison his delight.† Brabantio then enters this scene he asks about what is all the noise about as this scene takes place in the middle of the night. Brabantio is obviously worried as Iago calls out and say thieves are at Brabantios this creates a lot of fuss. Iago tells him that someone close is plotting against him (Othello) and that he should be more aware. Iago wants to be seen as a hero. Roderigo then takes the lead, as Iago does not want to get into trouble as he has still got to go back to Othello. Roderigo breaks the news to Brabantio. The language here shows that Roderigo is trying to break this news gently but the truth is he does not care about the consequences. â€Å"The worser welcome, I have charged thee not to haunt about my doors; in honest plainness thou hast heard me say etc Upon malicious bravery dost thou come to start my quiet.† Branbantio cannot believe what he is hearing he is in shock as he regards Othello highly. This clearly shows Othello has a very high status. Roderigo swears it is true and Iago backs this up showing his character to be a liar. Brabantio is forced to believe them making him insanely jealous and totally nieve. Iago then explains that Desdemonas happiness is important to him; once again Iago seems like our unlikely hero. Brabantio decides that he must go and find Othello to confront him. At the end of this Roderigo and Iago are once again left alone this is very significant to the scene as it shows that this scene had begun and ended in a very similar way. Roderigo finally reminds Iago of their deal the only thing they want is revenge on Othello. They strongly believe he deserves it, however as an audience we cannot make this judgement, as we have never met him. The only thing we as an audience can go off if what other characters have said about him. We believe Othello to be noble and brave not cunning and kneiving. Iago finally leaves to go back to Othello. This shows Iago is a plotter by going between these two characters, we do not know where his loyalty lies. Finally Brabantio returns and goes to find Othello he is angry and upset. Roderigo decides to go and find Othello too. This scene ends on a semi tense cliffhanger. This scene leaves the audience wondering what may lie ahead. The dramatic significants within this scene shows dramatic irony mainly focusing on Iago. This villain needs to be stopped, but how? Is the question still to be answered.   

Area 51 Essay

Area 51 Essay Area 51 Essay Dennis Roak Mr. Heywood Synopsis of Area 51 26th March 2014 The creation of Area 51 began in April of 1955, when a Lockheed test pilot, Tony LeVier, searched for a remote site to test the U-2. Grooms Lake is there has been speculation in the media for the last fifty year about paranormal activity at Area 51 near Roswell, New Mexico. The Roswell incident has brought about conspiracy theories that have reached the highest levels of government. The truth about the alleged UFO sightings and alien spaceship crashes around Roswell has been a continued argument that has grown to legendary proportions over the years. The government has categorically denied any military activity in the area. However, documentation and photographs have proven that the military is hiding something at the Roswell site. To create a greater mystery, the UFO enthusiasts have flooded the media with partial truths that have often been proven to be downright lies. The video of the extraterrestrial beings and their ships has been proven to be a hoax. Therefore, it can be asked what is the truth about the paranormal activities at Area 51? Roswell Army airfield was notified. Major Jesse Marcel investigated the report and took pieces of the disk to his home to reconstruct it. The Roswell case was closed at that time. However, documents have been found dated November 1952, that were addressed to President Dwight Eisenhower from Rear Admiral Rosco H. Hillinkoctler. The document was reported to be a

Definition and Examples of Modality in Grammar

Definition and Examples of Modality in Grammar In grammar and semantics, modality refers to linguistic devices that indicate the degree to which an observation is possible, probable, likely, certain, permitted, or prohibited. In English, these notions are commonly (though not exclusively) expressed by modal auxiliaries, such as can, might, should, and will. They are sometimes combined with not. Martin J. Endley suggests that the simplest way to explain  modality  is  to say that it has to do with the stance the speaker adopts toward some situation expressed in an utterance...[M]odality reflects the speakers attitude toward the situation being described (Linguistic Perspectives on English Grammar, 2010). Deborah Cameron illustrates with an example: [Modality] is what makes the difference between a factual assertion like  unicorns never existed, and a more guarded view, such as  it seems unlikely that unicorns could ever have existed- or a bolder claim like  the existence of unicorns must always have been a myth.  Modality, then, is a resource  speakers  and writers use when they are staking claims to knowledge: it allows them to formulate different kinds of claims (e.g., assertions, opinions, hypotheses, speculations) and indicate how committed they are to those claims. (The Teachers Guide to Grammar, Oxford University Press, 2007) Indicating Modality Grammatically Just as tense indicates a time aspect of a verb, words that are used to show modality indicate the mood of the sentence- that is, how factual or assertive the statement is- and it can be done in any number of ways, including with adjectives. Martin J. Endley in Linguistic Perspectives on English Grammar  explains: Thus, a situation might be described as  possible, probable, necessary, or  certain. The  noun  counterparts of these adjectives also express modality so that a situation can be described as a  possibility, a  probability, a  necessity, or a  certainty. Moreover, it is possible to use ordinary  lexical verbs  to convey modality....And think  about the difference between saying that you  know  something and saying that you  believe  something. Such differences are essentially a matter of modality. Finally, English also contains certain semi-fixed lexical phrases (e.g.,  rumor has it) that are, basically, modal expressions.  (IAP, 2010) Other terms that express modality are marginal modals, such as need, ought to, dare, or used to. In Depth: Types of Modality The range of possibilities expressed when using modality is a broad spectrum, ranging from not very likely to very likely; to express these different levels, modality comes with named gradations, as explained by authors  Gà ¼nter Radden and Renà © Dirven, in Cognitive English Grammar:   Modality is concerned with the speakers assessment of, or attitude towards, the potentiality of a state of affairs. Modality, therefore, relates to different worlds. Assessments of potentiality, as in You must be right, relate to the world of knowledge and reasoning. This type of modality is known as epistemic modality. Modal attitudes apply to the world of things and social interaction. This type of modality is known as root modality. Root modality comprises three subtypes: deontic modality, intrinsic modality and disposition modality. Deontic modality is concerned with the speakers directive attitude towards an action to be carried out, as in the obligation You must go now. Intrinsic modality is concerned with potentialities arising from intrinsic qualities of a thing or circumstances, as in The meeting can be canceled, i.e. it is possible for the meeting to be canceled. Disposition modality is concerned with a things or a persons intrinsic potential of being actualised; in particu lar abilities. Thus, when you have the ability to play the guitar you will potentially do so....Modal verbs have a special status among modal expressions: they ground a situation in potential reality. (John Benjamins, 2007)

Crude Oil Alternatives and The Future of the Transportation industry Research Paper

Crude Oil Alternatives and The Future of the Transportation industry (Trucking, Rail and Air) - Research Paper Example Historically transport has depended on animal power and then fossil fuels. The use of fossil fuels has been the human tradition for more than a century and a half now so there is little surprise that calls for change are gathering lingering discontent. The move to alternative energy systems may be slow but it is certainly steady. A number of avenues have been explored in regards to generating energy for the transportation industry. Ideas have ranged from the use of solar panels to the use of batteries in vehicles to power motion. These technologies can be seen as replacing the current transportation infrastructure altogether. However, certain other technologies such as the use of hydrogen will mean that the transportation infrastructure and principles will change but will not be replaced altogether. Another option is the merger between existing systems and newly introduced alternative technologies to create hybrid systems. These hybrid systems are currently the most viable option for changes in the transport industry. At this point in time, the transportation industry depends on one thing – an engine. All kinds of vehicles possess an engine to provide driving energy whether you talk of road vehicles, aquatic vehicles, air vehicles or space vehicles. The engine is fundamentally driven using materials that combust and in doing so provide energy. This applies equally across the board to all forms of conventionally powered vehicles. As far as changes to road vehicles are concerned, the industry has taken a large shift. In the early years of alternative energy development, the center focus remained the development of vehicles that utilized hydrogen as a fuel. This move was widely researched by leading manufacturers such as General Motors (GM), Ford, Honda, Toyota and BMW but a sustainable solution could not be found (BMW). One primary cause for the failure of this system was the need to replace the existing apparatus for fuelling while keeping costs to a mini mum. The oil based road vehicle took decades to come to a discernible form. Furthermore, a number of auxiliaries supports the oil based road vehicle in its operation. These include things such as manufacturing expertise, fuelling systems, maintenance systems etc. It was never practicable enough to realize a change in a few short years that would somehow replace the existing setup (Ghirardi, Togasaki and Seibert). Instead, the industry looked to other alternatives such as using the current hybrid systems. A hybrid system is essentially a combination of a conventional gasoline engine with a battery powered motor. The motor tends to operate in the lower driving speeds while the gasoline engine kicks in when more power is required. The road to change for road vehicles is expected to be the optimal path followed by other modes of transportation such as rail and air travel. Current attempts at alternative energy in air travel are looking at liquid hydrogen as the fuel of choice (Robertson ). However, rail transport alternative energy development is more advanced as hybrid solutions are being looked into. The rising costs of oil around the world are forcing manufacturers, retailers and operators to look for alternatives although the changes are not highly radical. In a few short years the price of crude oil has increased many fold. This trend is expected to continue as oil rich countries will control production

What is Sodium Potassium Pump Coursework Example | Topics and Well Written Essays - 250 words

What is Sodium Potassium Pump - Coursework Example In doing this, the enzyme performs fundamental functions that help maintain the life of the cell. The functions include regulating cellular volume by permitting the flow of both potassium and sodium in and out of the cell. The enzyme also maintains the resting potential of the cell and the transportation within the cells. Sodium-potassium pump regulates the cell volume through by pumping sodium out of the cell and potassium into the cell. The failure of such a vital function would cause swellings of the cells. By enhancing the flow of the two minerals in an out of the cell, the enzyme helps maintain the cells osmolarity, which is the totality of the concentration of organic compounds, proteins and ion species in the cell (Mary 33). Additionally, by pumping sodium out of the cells, the enzymes provide adequate force for other membrane transport proteins. This helps in the transportation of amino acids, glucose and other nutrients into the cells. In doing this, the transport proteins exploit the sodium gradient created by the sodium-potassium

Microsoft and Antitrust Essay Example | Topics and Well Written Essays - 500 words

Microsoft and Antitrust - Essay Example I therefore agree that Microsoft attempt is one of gaining monopoly power in the software industry. The windows operating system and the internet explorer browser are completely different products that should not be bundled together (Evans, 2002). Microsoft decision is thus one that denies fair competition from other browsers and their restrictive licensing is monopoly intended. In a pure monopoly one firm has the complete control in the production of their products because of barriers of entries for other businesses. There is therefore no competition in the industry and the pricing is not based on the forces of demand and supply. I am against monopoly structure because it promotes inefficiencies and discourages competition. Consequently, monopoly products are of low quality and are highly priced hence encouraging consumer exploitation. In a monopoly, prices and quantity demanded is set at the point of intersection of the marginal revenue and marginal revenue curve. If the marginal cost cuts the marginal revenue curve from the lowest point possible, it means that the firm is operating at optimal capacity and there is no room for expansion and it is at this point that the profit is maximized (Fellner, 1949). Since the demand curve is downward sloping, a reduction in price is accompanied by a corresponding increase in the quantity sold. The firm is therefore the price marker and therefore records high economic profits. Monopoly also deprives consumers their sovereignty of choice, as there are no substitutes for the company’s products. Failure or conditions that can halt the production of a company’s products will therefore result in acute shortages. Monopoly pricing coupled with artificial shortages to the society will result into dead weight loss to the society (2009). The locative inefficiencies in monopoly lead to loss by the society. Moreover, monopolies have been