Lab report Essay Example for Free

Lab report Essay Osmosis is a process that occurs at a cellular level that entails the spontaneous net movement of water through a semi-permeable membrane from a region of low solute concentration to an area of high solute concentration in order to equalize the level of water in each region. Involved in this process are hypotonic, hypertonic and isotonic solutions. A hypotonic solution is one with a lower osmotic pressure, indicating that the net movement of water moves into the said solution whereas a hypertonic solution is one with a higher osmotic pressure, thus the net movement of water will be leaving the hypertonic solution. Lastly, an isotonic solution entails no net movement of water across a semi-permeable membrane as the two substances involved display osmotic equilibrium. AIM To observe the effect of solutions different levels of NaCl concentration on potatoes, considering the process of osmosis METHOD (see ‘Potato Osmosis’ – exercise document) Generally rigid in structure although slightly bendy Pale yellow in colour Moist All strips appear the same/similar in structure and size at this point Observations – Post-Extraction Strips immersed in 1. 0M NaCl Solution are very soggy, soft and appear shrunken Strips immersed in 100% H2O are very rigid, swollen, turgid and appear larger/longer they are slightly bent and cannot be straightened due to their rigidity Strips become progressively soggier as the solutions they are immersed in are higher in concentration of NaCl (Fig. 2) Potato strips from the same potato arranged in  descending order of concentration to demonstrate the differences in structure post-extraction. Thus, we can state that there appears to be a negative correlation between NaCl concentration and the mass and length of the potato strips, clearly evident in the above graph which shows an exponential decrease in both mass and length. This can also be initially seen in the post-extraction observations  where it is evident that the potato strips immersed in lower NaCl concentration were far more turgid than those immersed in 100% NaCl solution which were flacid and fragile (see strip-comparison in Fig. 2). This occurrence can be explained through the process of osmosis. As mentioned in the introduction, a hypertonic solution is one with higher osmotic pressure meaning that the net movement of water leaves the solution. This would explain the physical changes – the increase in mass and length as well as the increase in turgidity in the potato strips immersed in 100% H2O solutions or low NaCl-concentration solutions. Since the solution it is submerged in is higher in concentration in water molecules, or hypertonic, the water molecules will diffuse into the area of lower H2O-concentration (the potato strip) in order to achieve equilibrium. Alternatively, the decrease in mass and length in the potato strips submerged in highly concentrated NaCl solutions can be explained by its immersion in a hypotonic solution. Hypertonic solutions, as mentioned Potato Osmosis Biology SL ATh before, are described as those with lower osmotic pressure, indicating that the net movement of water moves into the solution. Therefore, as NaCl solution is less concentrated in H2O molecules than the potato strips, the decrease in mass and length and loss of turgidity results from the net movement of water leaving the potato strips, which is higher in osmotic pressure, and diffusing into the solution. Nevertheless, there are several possible sources of error that could have greatly or negligibly affected the outcome of the experiment. First, we must note the varying external factors resulting from an uncontrolled environment – the biology classroom. Primarily, these would include varying temperatures and humidity which could potentially affect the rate of osmosis as increased temperature results in increased diffusion while increased humidity results in an increased number of water molecules. Secondly, we must note the human errors involved, for example, miscalculations in experimental preparations. These would include the miscalculation of solutions leading to an inaccurate concentration of NaCl as well as the possibility of impurities in the NaCl concoction in the first place while imprecise cutting of the potato strips could’ve affected the surface area and thus the rate of osmosis. This leads us to the errors resulting from variances in the substances used. As already discussed previously, differences in surface area of each potato strip caused by imprecise cutting as well as the marks (lines and notches) imprinted would’ve affected the rate of osmosis while the concentration gradient between each potato strip is likely to differ as well. This stems from the differences in water content of each potato, as, for example, a potato with high water concentration in highly concentrated NaCl solution would have a faster rate of erosion. Further affecting factors could include barriers to diffusion such as the size of pores which would also determine the rate of osmosis. All the mentioned errors above hold the possibility of skewing the data. Subsequently, such errors could have an effect on the reliability of the results. The level of accuracy which has been used throughout this investigation would come into question as a combination of these errors would not permit such precision. Values of percentage change have been taken at two decimal places corresponding with the actual values of mass and length, however, this could be seen as far too precise. A better option would have been to take percentage change as whole numbers or at one decimal place. Nevertheless, we attempted to reduce the potential errors through several measures. With surface area, a cork borer was used in order to uniform the size of the potato strips while the varying concentration gradients were controlled through the completion of several trials (three trials with three potatoes) in order to limit error. Furthermore, to control the effects of the external environment, foil was secured over the beaker containing the submerged potato strips. However, if we refer to the graph, we can see the minimum and maximum spread for each data-point is generally close-set while the R2 value, which calculates the spread of the datapoints from the line of best fit, are both relatively high – both around 0. 9. This demonstrable trend indicates a limiting of the amount of error, and thus fairly reliable results despite possible errors. Overall, the results  ultimately seem reliable although it might’ve been even more reliable by reducing the level of precision (decimal places) when recording it. Ultimately, potential improvements will stem from attempting to reduce the amount of error in this investigation, particularly involving controlling the external environment and the miscalculations. To control the external affecting factors, the solution containing the potato strips can be kept overnight instead in a controlled environment with consistent temperatures and humidity. Limiting the human error would be difficult and time-consuming as this would involve Potato Osmosis Biology SL ATh highly-precise instruments or even more focus dedication from the experimenter during preparation. Finally, nothing can be done to uniform the response of the materials used, thus the completion of even more trials limits the potential error and allows the formation of generalizations. Despite the improvements proposed, those relating to limiting human error and completing more trials may prove to be futile as they are not only time-consuming, but the demonstrable trends resulting from this experiment indicate that no further improvements are necessary to reach the desired conclusion. Having established that there is no real need to pursue drastic improvements for the initial experiment, we can now proceed to discuss possible extensions to the investigation. While we already know the results of osmosis on a potato, we may now wish to better understand it. This can be done by recording the progress of the potato’s transformation either (a) over a period of time (perhaps 24 hours) or (b) until it has reached the point of equilibrium. The mapping of this progress would involve the periodic removal of the samples in order to measure its mass and length, after which it can be compiled into a graph to chart the transformation under osmosis. Alternatively, we could compare the progress of a potato to another type of vegetable or fruit in order to ascertain water content of each. Lastly, the submerged potato strips may be subjected to different kinds of environment, particularly, varying humidity and temperature, without the protection of a foil cap. This would reveal how much of an impact environmental factors would have on the osmotic process and how would the effects manifest. In relation to the question of the sailor, this could represent the life-span one would expect when trapped in certain climates.

Submission or Revolt in Charlotte Brontes Jane Eyre :: free essay writer

Jane Eyre: Submission or Revolt The single greatest conflict of Charlotte Brontà «'s Jane Eyre is Jane's struggle between submission and revolt. At times it is difficult for her to know which of those two actions to choose-- she is a spirited woman who cannot accept oppression but sometimes has no choice but to submit. As a little girl she had no knowledge that there was a medium between the two. Eventually she learns moderation and she doesn't need to choose submission or revolt; she comes into her own money by the end and escapes from the oppression she suffered as a child. Jane's oppression begins at Gateshead Hall while living with her Aunt Reed and cousins. For most of her time there, she chooses submission to all their cruelties because she has no choice really. She is a little child with no money and not living relatives that she knows about. John Reed is terrible to her; he teases Jane cruelly and tries to harm her. Jane sees "in him a tyrant: a murderer" in the instance when he yells at her for reading his books and then throws the book at her, drawing blood (13). This is when Jane decides not to remain passive and submit to these cruelties, but to revolt fully against him. She insults him back and physically fights with him. As a result of this, however, Jane is forced to submit to even greater oppression by Mrs. Reed; she is locked in the red-room like an animal. She tries to revolt, but she is unable to accomplish anything at all while locked in the room, except for becoming ill with fear of the room. Before Jane leaves Gateshead for Lowood Institution, she chooses to verbally revolt against Mrs. Reed, as she was unable to before. She tells Mrs. Reed that she is "bad, hard-hearted" and "deceitful" and renounces her as a relation (39). Soon after, Jane is off to Lowood school where more adults tell her what to do. Jane is not as oppressed at Lowood school, but she still is not allowed to do as she pleases, especially not at first. The teachers treat her well, especially Miss Temple, one of her closest friends there. However, after she has been there a few weeks, Mr. Brocklehurst puts her in front of the class and denounces her as a liar. Helen Burns entreats Jane not to let it get her down because Brocklehurst "is not a god" and is disliked by everyone (71).

Diploma of management

â€Å"Smart† Goals Kebab's R Us is a company always striving to improve and gain a higher and greater market share. With our dedicated staff we were able to achieve all our major goals that were set out last year. These goals were to increase the number of kebabs sold throughout all caravans, to update 20% of caravans by replacing it with a new caravan and brand new catering equipment that was more efficient, to reduce our greenhouse gas emissions, to create a ‘mini sub kebab' that could be catered for functions, to improve profits from $1 1. Million to $12 million in the financial year ending 2014, to place leadership programs in place to help employees to be trained to become caravan managers and to stay injury free. Results over the last year have been quite positive, meeting all target goals have been a credit to all staff. Hard work and dedication had paid off once the yearly report came in which backed it up with evident numbers. Falling Just short of the profit ma rgin at $1 1. 9 million is still a satisfactory result. These achieved goals are a credit to all staff and also to the senior management team for applying the S. M. A.R. T goals principle to reach each. The teeters of SMART each represent a meaning these are; S- Specific M- Measurable A- Accountable R- Realistic T- Time Bound Major goals for next year will be similar in terms of growth and profit. Important objectives of not losing any customers, providing kebabs of the highest quality possible, to reach those customers or to cater for a wider community. To update a further 20% of caravans by replacing it with a new caravan and brand new equipment that will be more efficient lowering greenhouse gas emissions. Improving turnover to $40 million from last year's $38. Million whilst also improving profits to $13 million. To introduce a commission scheme of selling a min of 250 kebabs a day to caravan operators which would result in bonuses and to promote those already trained personal i nto the 20 caravans that's planned to hit the roads. Further improvement training to all personal of customer service which is federal government funded. Hiring 40 new staff to fill into the new caravan positions that are going to be opening, surveying customers to help us improve our service and also to yet again remaining injury free.Having similar target goals from last year ensures a greater chance to achieve these goals through the usage of SMART. Major goal NO. I Specific – Update a further 20% of vehicles including company cars and caravans from the start of the new financial year in 1/7/14-30/6/15. To achieve this goal Kebab's R Us will use clearly defined processes and guidelines that were also used from the previous year to achieve the same goal. Location of vehicles that are being upgraded is the Queensland region. Requirements of this goal are enforced by government legislation and also to have a better looking image.Measurable- This goal is measurable as we need to have 20 vehicles updated in one year. Every quarter the aim is to have 5 vehicles upgraded. A project manager with a team is in hare of this changeover and upgrade in which they closely monitor it. Every quarterly the project manager attends a senior management meeting to discuss progress. Accountable- Everyone working in the changeover and management team is all liable to work in conjunction with each to achieve this goal. Realistic- The same goal was set out last year and it was achieved so it makes it a realistic proposition this year.Time Bound- The time frame for this goal will start from the 1/7/14-30/6/15, in this timeshare 20 vehicles must be updated to accomplish this goal. Major goal NO. 2 Specific- Improving turnover to $40 million from last year's $38. Million in the financial year starting on 1/7/14 till the end of that financial year in 30/6/15. To achieve this goal Kebab's R Us will use clearly defined processes and guidelines which will set the foundation to hit t he ground running with changes in certain areas which will help the growth of the company.Located nationwide this goal is every employees aim. Requirement for this goal is to improve our market share and our share prices. Measurable- This goal is measurable as the company needs to grow by only $1. 9 million in the next financial year. The lowly some is still good considering a few years back of poor results. The finance team along with senior management is responsible to monitor and innovate new ways of increasing funds. Every month a meeting will be held to monitor and discuss changes to this goal.Accountable- The recruiting team regional managers which is led by the HRS officer. Realistic- This goal is realistic as new caravans rolling out every quarter new positions will open up therefore creating the chance to hire 10 new casuals every quarter to achieve this goal. Time Bound-The time frame for this goal will start from the 117/14-30/6115. The first intake of 10 new employees is expected on the 1/10/14 followed by the next quarter at 1/111 5 in conjunction of the new caravans becoming available.

Effective Communication For The Nursing Profession

A Reflective Essay on Effective Communication Skills in the Nursing Profession. Name: Carmela Alitin Student Number: n9713271 Unit: PYB007 Communication for Health Professionals Tutor: Aleana Green Tutorial: Thursdays 11am-1pm, Z-607 Word Count: 1,380 A Reflective Essay on Effective Communication Skills in the Nursing Profession â€Å"Effective communication is integral in every profession, but in nursing, it could mean the difference between life and death,† (E.S Alitin, personal communication, 31 March, 2016). Effective communication is a skill that must be adopted as it is a means in achieving optimal outcome in all professions. To demonstrate this, I recently had the opportunity to interview a professional in nursing to discuss the important role of effective communication and how this may help me for my future profession as a lawyer. Using the 4 R’s model, the following essay will present this topic, highlighting the influence of communication in developing respectful relationships with both patients and colleagues in the workplace. Reporting and Responding to the Interview The interview was conducted with a registered nurse with more than 10 years’ experience. Her current role is working in the Medical Assessment and Planning Unit, in particular, the palliative care area. On a regular basis, her role involves providing safe and quality care to her patients, and more specifically end of life care. In doing so, two predominant skills of communicationShow MoreRelatedNursing and Social Responsibility1468 Words   |  6 Pagesthe values of professions in general and nursing in particular† and that â€Å"the underlying constructs of social responsibility, communication and teamwork are woven into the fabric of nursing s history and its code of ethics†(Kelley,2008). 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