A microscope: An overview

A microscope: An overview 1. Introduction A microscope is an instrument used to investigate tiny objects which cannot be seen by naked eyes. There exist three types of microscopes which are optical microscopes, electron microscopes, and scanning probe microscopes. (1) Six types of microscopes talked in this report are reflected and transmitted light microscope, scanning electron microscopes (SEM), transmission electron microscopes (TEM), focused ion beam (FIB), and atomic force microscope (AFM). 1.1 Reflected light microscopes Reflected light microscope is a type of microscope using visible light and a system of lenses to magnify images of small samples. It is used to examine opaque specimens which will not transmit light and other materials such as ceramics.The reflected light travels through the objective lens, which in this arrangement acts as both a condenser and an objective, and strikes the specimen.It is then reflected off the specimen back up through the objective lens, the head, the eyepieces, and finally to the eye.(2) 1.2 Transmitted light microscope Transmitted light microscope is a type of microscope where the light transmits from a source on the opposite side of the specimen from the objective. Usually the light is passed through a condenser to focus it on the specimen to get very high illumination. (3)After the light passes through the specimen, the image of the specimen goes through the objective lens and to the oculars where the enlarged image is viewed. 1.3 Scanning electron microscope The scanning electron microscope (SEM) is one kind of electron microscope. The SEM utilizes a very fine probing beam of electrons scanning over the specimen to emit a variety of radiations. The signal which is proportional to the amount of radiation leaves an individual point of the sample at any time. The signal obtained from one point will display the information of that point. In practice, the points follow one another with very high speed so that the image of each point becomes an image of a line, and the line move down the screen so rapidly that the naked eye sees a complete image on the computer. SEMs are patterned after reflecting light microscopes and will yield similar information 1.4 Transmission electron microscope A transmission electron microscope (TEM) works much like a slide projector. A projector shines a beam of light through the slide, as the light passes through it is affected by the structures and objects on the slide. These effects result in only certain parts of the light beam being transmitted through certain parts of the slide. This transmitted beam is then projected onto the viewing screen, forming an enlarged image of the slide. TEMs work the same way except that they shine a beam of electrons through the specimen. Whatever part is transmitted is projected onto a screen for the user to see. TEMs are patterned after transmission light microscopes and will yield similar information. 1.5 Focused ion beam A focused ion beam system (FIB) is a relatively new tool that has a high degree of analogy with a focused electron beam system such as a scanning electron microscope or a transmission electron microscope. In SEM and TEM the electron beam is directed towards the sample generating signals that are used to create high magnification images of the sample. The major difference with a focused ion beam system is the use of a different particle to create the primary beam that interacts with the sample. A highly focused ion beam is used instead of electrons in FIB. As the beam scans the surface of the sample, a highly magnified image is created, which allows the system operator to view the samples microscopic features clearly. 1.6 Atomic force microscope The AFM is one of the foremost tools for imaging, measuring and manipulating matter at the nanoscale. The information is gathered by feeling the surface with a mechanical probe. To achieve atomic scale resolution, a sharp stylus (radius ~1-2 nm) attached to a cantilever is used in the AFM to scan an object point by point and contouring it while a constant small force is applied to the stylus. Piezoelectric elements that facilitate tiny but accurate and precise movements enable the very precise scanning. (4) 2. Study of comparison among six kinds of microscopes 2.1 Optical microscopes Optical microscopes, which use visible wavelengths of light, are the simplest and most used. Both transmitted light microscopy and reflected light microscopy need low energy and the microscope itself is much cheaper and smaller than electron microscopes. Compared to electron microscopes, the optical microscopes have another advantage that the image obtained from them is in color. Comparing to reflected light microscope, the transmitted light microscope only works on light transparent specimens but not metal, ceramics and some polymers such as rubber. However sample preparation of transmitted light microscope is relatively complicated. As it requires sample thin enough for the light to go through. This can be done by using a microtome to slice at lower temperature; as well the distortion of the section due to the sample preparation is a problem for observing. (5) 2.2 SEM The SEM has allowed researchers to examine a much bigger variety of specimens no matter it is bulk or thin layer. The scanning electron microscope has many advantages over optical microscopes.The SEM has a large depth of field, which allows more of a specimen to be in focus at one time.The SEM has much higher resolution (~1-5nm). (5)Because the SEM uses electromagnets rather than lenses, much more control in the degree of magnification can be done.All of these advantages, as well as the actual strikingly clear images, make the scanning electron microscope one of the most useful instruments in research today. However, materials that can be examined in the SEM must be vacuum compatible, clean and electrically conducting such as metal. But for non-conducting materials such as ceramic and polymers, gold or carbon coating on the surface of the sample is essential. 2.3 TEM TEM is a technology using a high energy (80-200kV) beam of electrons to transmit through an ultra thin specimen (50-200nm). High resolution (~0.2nm) is the most significant advantage of TEM. (5) However, there are a number of drawbacks to the TEM technique. Many materials require extensive sample preparation to produce a sample thin enough to be electron transparent, which makes TEM analysis a relatively time consuming process. The structure of the sample may be changed during the preparation process. Also the field of view is relatively small, which leads to the region analyzed may not be characteristic of the whole sample. There is potential that the sample may be damaged by the electron beam, particularly in the case of biological materials. 2.4 FIB FIB is usually used to examine metal surfaces. If the sample is non-conductive, a low energy electron flood gun can be used to provide charge neutralization. FIB is inherently destructive to the specimen because when the high-energy gallium ions strike the sample, they will sputter atoms from the surface. Ga atoms will also be implanted into the top few nanometers of the surface making the surface amorphous. (6) These limitations produce noticeable effects when using techniques such as high-resolution lattice imaging TEM or electron energy loss spectroscopy. 2.5 AFM The AFM is a very high-resolution type of scanning probe microscope, with demonstrated resolution of fractions of 1 nm. (4) AFM provides a true three-dimensional surface profile. Additionally, samples viewed by AFM do not require any special treatments such as coating. Most AFM modes can work perfectly in air or even a liquid environment without a need of vacuum. This makes it possible to study not only metal, ceramic, polymer but also biological macromolecules and even living organisms. In principle, AFM can provide higher resolution than SEM. It has been shown to give true atomic resolution in ultra-high vacuum and in liquid environments. High resolution AFM is comparable in resolution to TEM. A disadvantage of AFM compared with the scanning electron microscope (SEM) is the image size. The AFM can only image a maximum height on the order of 10-20 micrometers and a maximum scanning area of around 150 by 150 micrometers. (4) Another inconvenience is that the AFM could not scan images as fast as an SEM, requiring several minutes for a typical scan, while a SEM is capable of scanning at near real-time after the chamber is evacuated. The relatively slow rate of scanning during AFM imaging often leads to thermal drift in the image making the AFM microscope less suited for measuring accurate distances between topographical features on the image. (4) 2.6 Competition 3. Example of applications 3.1 Reflected light microscope Normally, reflected light microscope is used to image metal, ceramic and rubber. Thats the reason why it is also called metallurgical microscope. Nowadays it becomes a fast growing interest; especially in regard to its increasing usefulness in the fluorescence microscopy as well as the rapidly growing semiconductor industry had also led to an increase in the use of reflected light microscopes. (7) 3.2 Transmitted light microscope Polymers can commonly be looked at under the transmitted light microscope, because most of them are transparent or translucent. It can also analyze cell slices obtained from organism. Most of the lab can afford a transmitted light microscope since it is relatively cheap. 3.3 SEM About any scientific field can use an SEM as a research tool. It can be used to look at the crystalline structures of chemical compounds and how their bonds form. A scanning electron microscope is especially useful for looking at the surfaces of materials at an atomic level. 3.4 TEM TEM can do diffraction analysis of small areas by selected area diffraction. High resolution x-ray microanalysis and analysis of crystal defects such as dislocations, stacking faults using diffraction contrast can also be done by using TEM. Another important application is it can image lattice of crystalline materials. (8) 3.5 FIB FIB can be used as Ion beam imaging. The FIB also offers the ability to perform nanopatterning and micromachining respectively, and by instructing the machine to add or remove pertinent features, operator can design and prototype a new micro or nanostructure, modify integrated circuits and cross section specific features to allow failure analysis even in the 3D (TEM sample preparation). FIB is also used for Secondary ion mass spectrometry (SIMS). (7) The ejected secondary ions are collected and analyzed after the surface of the specimen has been sputtered with a primary focused ion beam. 3.6 AFM The atomic force microscope (AFM) is one of the most powerful tools for determining the surface topography of native biomolecules at subnanometer resolution. AFM allows biomolecules to be imaged not only under physiological conditions, but also while biological processes are at work. The AFM can also provide insight into the binding properties of biological systems. 4. Summary Characteristics of six different types of microscopes are compared in this article, including sample preparation and technique limitations. Each one has its advantage and disadvantage, so it is necessary to consider comprehensively before choosing, for example, the type of the material, needed information, vacuum compatible, conductivity and sample preparation, etc. References Microscopy and Analysis. [Online] http://www.microscopy-analysis.com/. Reflected Light Microscopes. [Online] http://reflectedlightmicroscopes.com/. Wikipidia. Optical microscope. [Online] http://en.wikipedia.org/wiki/optical Microscope. W. Richard Bowen, Nidal Hilal. Atomic force microscopy in process engineering : introduction to AFM for improved processes and products. 2009. Geoff West, John Bates, David Ross, D Grandy, J Perkins. MPP242 Microscopy Handouts. Loughborough: The department of materials, 2009. Peter J. Goodhew, Richard Beanland, John Humphreys. Electron microscopy and analysis. s.l.: Taylor Francis Ltd, 2000. The Royal Microscope socieity. [Online] http://www.rms.org.uk/. Brent Fultz, James Howe. Transmission electron microscopy and diffractometry of materials . 2008.

If You Want to View Paradise :: Personal Narrative Cane Fields Papers

If You Want to View Paradise When the sugar cane burned a thick pillar of black smoke twisted and grew up from the fields. The beanstalk of cloud was seen from anywhere on the island and for an afternoon everyone stopped their chores, their cars, their machines to exhale at the desecrating monster. The fire lifted soil, plant debris, worker's gloves and t-shirts forgotten in the fields, insects and rats, children forgotten in the fields, all charred to ash, into the air, stirred it up and threw it back to earth to be interpreted by a more creative voodoo. Cane ash cycloned up in the pillar and blew onto nearby communities with the tradewinds. Curled black ash rained down on my brother and me playing basketball in the driveway. The ash, light, tossed in the wind, collected curled in corners like loose pubic hair. The farmers burned the cane purposefully. They followed the flame, directing it to burn row after row. Late into the night they followed the fire in a semi-circle on the upwind side wearing Hula Bowl t-shirts around their faces like bandits to filter the smoke. Train robbers trying to control the steam locomotive with shovels. Trains have a tendency to run away. The fire husked the cane for them and though it burned a portion of the precious sugar it also burned the glass hairs along the stalk that itched skin and throats for days. The cane fields spread in rows like radio waves echoing out from the base of the Waianai mountain range. On these mountains, closer the peaks at the topmost corner, was a preserve, a deathbed for the last pristine area on the island. Here the rarities mingled in an elite cocktail party for the terminally ill. The Ohia Lehua rooted shallow on the cliffsides, its wood trunk dry like beach wood and its blossoms a blood red exploding out like firecrackers from light green dime shaped leaves. Ala ala wai nui crawled out of holes in boulders. It is called a succulent, its leaves absorb water and are thick and peach fuzzed for it. It is strong enough to break rocks but can not conquer a field of pili grass. The Manono's leaves come out two at a time, opposite each other on the same node. They look like cho cho lips, fat lips, puckering up. They are not plants that grow together supporting and encouraging one another to grow.

The Witch Of Blackbied Pond :: essays research papers

The Witch of Blackbird Pond   Ã‚  Ã‚  Ã‚  Ã‚  Kit Tyler, the main character of Elizabeth George Spear's book, The Witch of Blackbird Pond, must leave her carefree life in tropical Barbados, and go and live in Connecticut. She learns that playing is what is to life, but hard work. She learns that if people do not know you, that they pre judge you. She also learns that if you don't live up to the Puritan life style, that they will look down at you. Kit must learn to cope, and learn from all these changes in her life.   Ã‚  Ã‚  Ã‚  Ã‚  First of all her grandfather dies, which leaves her as an orphan. She byes a ticket to Connecticut, where the last of her relatives live. When she arrives she is hit with a new way of life. In Barbados, slaves did the work, so Kit never worked before. She comes dressed in a Silk dress, which at that time was unacceptable in Connecticut. When she arrives at her relative's house, she is amazed how small in was compared to the house she lived in on Barbados.   Ã‚  Ã‚  Ã‚  Ã‚  Secondly, she goes to church. In Barbados her grandfather never stressed church as being important, so this was a new experience. When they started to sit down, the family separated into two groups, the men would go to the left, while the women sat to the right of the aisles. Then the Priest would talk about that Sunday's lesson. Then they went home, and had Sunday's dinner. Then her uncle would read out of the Bible. Then they would go to bed.   Ã‚  Ã‚  Ã‚  Ã‚  Thirdly, the people never like people that never followed the rules. One day when Kit was working in the field, see was told a story of an old Quaker woman that lived by Blackbird Pond. A Quaker was people that didn't come to Sunday services like the Puritans stated, and wouldn't follow the Puritans' way of life. They said that this old Quaker was a witch, and had cast spells on the city. Kit didn't believe the stories, and one time after she finished her work, went to visit the old woman. When see arrived, she saw a poor old women in a tiny little house, and then Kit started to help her. When the children of the town got sick, the town people went to get to old women, and make her stand trial for supposedly casting a spell.

Darkness from Within: Analyzing Hawthorne’s Essay

Nathaniel Hawthorne’s â€Å"Young Goodman Brown† is a chilling exploration of how a man could project upon others his own darkness. Through a pact with the Devil, Goodman Brown becomes obsessed with the supposed sins of the townspeople. Hawthorne utilized many symbolisms to depict how Goodman Brown transformed into â€Å"a stern, a sad, a darkly meditative, a distrustful, if not a desperate man did he become† (91). To use a word descriptive of many people today, Goodman Brown became a cynic. So when he died, the townspeople â€Å"carved no hopeful verse upon his tombstone, for his dying hour was gloom† (92). At the start of the story, Goodman Brown was a naive young man who has just been married. He has a dream in which he sees all the best people in the village, including his wife. Presumably, in his experience with sex in his newly-married state, the sexuality — the human quality — of everyone, including his wife, his parents, his minister, and his teachers, dawns on him in a traumatic way in that he has always been taught by his Puritan teachers that the flesh is sinful. However, Goodman Brown had seen both the best and the worst in human nature. In this process, Goodman loses his â€Å"faith† and his love and chooses to believe the worst. The story did not tell everything as easy because readers are enjoined to assume that Goodman Brown’s former innocence had been derived from ignorance, as knowledge comes to him with so much intensity that he is not able to excuse himself for the ignorance that he had. And he blames everyone else because none of them told him these things before. In short, he wants to have had divine knowledge, and he thus challenges the way of things in every respect. Just by being human, people he sees through his loveless eyes transform into witches. Those who have this loveless view of others have already, ironically, partaken of the devil’s baptism. Like Brown, they forever after will be â€Å"more conscious of the secret guilt of others, both in deed and thought, than they could now be of their own† (91). Reading â€Å"Young Goodman Brown† is a good motivation for examining point of view — the way we see other people. The result is a reversal of roles between good and evil, which is like the reversal that occurred after the hysteria of 1692 whereby the â€Å"witches† were perceived as martyrs and the accusers and condemners were seen as persecutors. Hawthorne is interested in what people’s points of view and judgment tell us about them, so the focus in the discussion of witchcraft is primarily on those who see witchcraft in others. The story is rich in symbolisms thst make up what it lacks in physical descriptions, which contributes to its reader’s puzzlement that more often becomes fear. In the story, we only know that Faith has a â€Å"pretty head† (83); that Goodman Brown is young; that Goody Cloyse is â€Å"a female figure† (85) who cackles; that Martha Carrier is â€Å"a rampant hag† (90); that the crowd in the forest is â€Å"a grave and dark-clad company† (89). The reason why Hawthorne avoids particulars in this story is because the unreality and vagueness increase the nightmarish atmosphere of the story. For instance, why is Faith’s â€Å"pink ribbons† is mentioned five times in all? What is the meaning of the appearance of the ribbons in the woods? It would seem to be a concrete evidence that something bad occurred to her. Fogle (1964, p. 18) suggested otherwise: â€Å"If Goodman Brown is dreaming the ribbon may be taken as part and parcel of his dream. . . This pink ribbon appears in his wife’s hair once more as she meets his on his return to Salem the next morning†. For me, what’s more frightening in Hawthorne’s â€Å"Young Goodman Brown† is not the devil, the witchcraft or even Brown’s solitary walk through the forest at dusk, but it is the contrast between Brown’s innocence and the evil that he comes to learn is hidden in his very own community. Works Cited Fogle, Robert Harter. Hawthorne’s Fiction: The Light and Dark (Norman: Univ. of Oklahoma Press, 1964). Hawthorne, Nathaniel. â€Å"Young Goodman Brown†

The Return: Midnight Chapter 43

â€Å"Elena?†Stefan said quietly. â€Å"Could you ask me to come in? You have to invite me in if you want to – to talk – â€Å" Invite him in? He was already in – inside her heart. She had told the Guardians that everyone would have to accept Stefan as her boyfriend of almost a year. It didn't matter. In a low voice she said, â€Å"Come in, Stefan.† â€Å"The window's locked from your side, Elena.† Numbly, Elena unlocked the window. The next moment she was encompassed by warm, strong arms in a desperate, fervent embrace. But the moment after that, the arms dropped, leaving her frozen and lonely. â€Å"Stefan? What's wrong?†Her eyes had adapted and by the starlight through the window she could see him hesitating before her. â€Å"I can't – It isn't – It's not me you want,†he said in a rush that sounded as if it came through a constricted throat. â€Å"But I wanted you to know that – that Meredith and Matt are holding Bonnie. Comforting her, I mean. They're al okay and so is Mrs. Flowers. And I thought that you – â€Å" â€Å"They put me to sleep! They said they wouldn't put me to sleep!† â€Å"You fel asleep, lo – Elena. While we were waiting for them to send us home. We al watched over you: Bonnie, Sage, and I.†He was Stillspeaking in that formal, unusual tone. â€Å"But I thought – Well, that you might want to talk tonight, too. Before I – I left.†He put a finger up to stop his lip from shaking. â€Å"You swore you wouldn't leave me!†Elena cried. â€Å"You promised, not for any reason, not for any length of time, no matter how noble the cause!† â€Å"But – Elena – that was before I understood†¦Ã¢â‚¬  â€Å"You Stilldon't understand! Do you know – â€Å" His hand flew to cover her mouth and he put his lips to her ear. â€Å"Lo – Elena. We're in your house. Your aunt – â€Å" Elena felt her eyes widen, although of course subconsciously she had known this al along. The air of familiarity. This bed – it was her bed, and the spread was her beloved gold and white bedspread. The obstacles she'd known how to avoid in the dark – the tapping at her window†¦she was home. Like a climber who has negotiated an impossible-seeming section of rock, and almost fal en, Elena felt a tremendous rush of adrenaline. And it was this – or, perhaps, simply the power of the love that flooded through her – that achieved what she had been so clumsily trying to reach. She felt her soul expand and come out of her body. And meet Stefan's. She was appal ed by the hastily swept-away desolation in his spirit, and humbled by the surge of love that flooded every part of him at the touch of her mind. Oh, Stefan. Just – say that – that you can forgive me, that's all. If you forgive me I can live. Maybe you can even be happy with me again – if you just give it a little time. I'm already happy with you. But we have all the time in the world, Stefan reassured her. But she caught the shadow of a dark thought whisked quickly out of the way. He had al the time in the world. She, however†¦ Elena had to choke back a laugh but then clutched at Stefan suddenly. My backpack – did they take it? Where is it? Right beside your nightstand. I can reach it. Do you want it? He reached in the darkness and pul ed up something heavy and rough and none too pleasant-smel ing. Elena thrust one frantic hand inside it while Stillholding on to Stefan with the other. Yes! Oh, Stefan, it's here! He was beginning to suspect – but he only knew when she drew out the bottle labeled Evian Water and held it to her cheek. It was icy cold, although the night was mild and humid. And as it effervesced violently, it glowed in a way that no ordinary water did. I didn't mean to do it, she told Stefan, suddenly worried that he might not like to associate with a thief. At least – not at first. Sage said to get the water from the Fountain of Eternal Youth and Life into bottles. I dug up a big bottle and this little one, and somehow I stashed the smaller one in my backpack – I'd've put the big one in, too, but it didn't fit. And I didn't even think about the little one again until after they took away my Wings and my telepathy. And a good thing, Stefan thought. If they had caught you – oh, my lovely love! His arms squeezed the breath from Elena's lungs. So that's why you were suddenly so eager to leave! â€Å"They took almost everything else supernatural about me,†Elena whispered, placing her lips close to Stefan's ear. â€Å"I have to live with that, and if they'd given me a chance I'd have agreed – for the sake of Fel ‘s Church – if I'd been logical – â€Å"She broke off as she suddenly realized that she had been literal y out of her mind. She'd been worse than a thief. She'd tried to use a lethal attack on a group of – mostly – innocent people. And the worst thing was that a part of her knew that Damon would have understood her madness, while she wasn't sure Stefan ever could. â€Å"But you don't have to change me into – you know,†she began whispering frenetical y again. â€Å"A sip or two of this and I can be with you forever. Forever and – for – forever – Stefan – â€Å"She stopped, trying to get her breath and her mental balance. His hand closed over hers on the cap. â€Å"Elena.† â€Å"I'm not crying. It's because I'm happy. Forever and ever, Stefan. We can be together, just†¦just us two†¦forever.† â€Å"Elena, love.†His hand kept hers from twisting open the bottle. â€Å"It – isn't what you want?† With his other arm, Stefan pul ed her tightly to him. Her head fel forward onto his shoulder and he rested his chin on her hair. â€Å"It's what I want more than anything. I'm†¦dazed, I guess. I have been ever since – â€Å"He stopped and tried again. â€Å"If we have al the time in the world, we have tomorrow,†he said in a voice muffled by hair. â€Å"And tomorrow is time enough for you to start to think it through. There's enough in that bottle for maybe four or five people. You're the one who's going to have to decide who drinks it, love. But not tonight. Tonight is for†¦Ã¢â‚¬  With a sudden rush of joy Elena understood. â€Å"You're talking about – Damon.†Amazing how difficult it was to simply say his name. It almost seemed a violation, and yet†¦ When he could talk – like this – for a moment to me, he told me what he wanted, she sent. Stefan stirred a little in the darkness, but said nothing. Stefan, he only asked for one thing before he†¦went. It was not to be forgotten. That's all. And we're the ones who remember the most. Us and Bonnie. Aloud she added, â€Å"I wil never forget him. And I wil never let anyone else who knew him forget him – for as long as I live.† She knew she'd spoken too loudly, but Stefan didn't try to quiet her. He gave one quick shudder and then held her tightly again, his face buried in her hair. I remember, he sent to her, when Katherine asked him to join her – when we three were in Honoria Fell's crypt. I remember what he said to her. Do you? Elena felt their souls intertwine as they both saw the scene through the other's eyes. Of course, I remember too. Stefan sighed, half-laughing. I remember trying to take care of him later in Florence. He wouldn't behave, wouldn't even Influence the girls he fed on. Another sigh. I think he wanted to get caught at that point. He couldn't even look me in the face and talk about you. I made Bonnie send for you. I made sure she got both of you out here, Elena told him. Her tears had begun to flow again, but slowly – gently. Her eyes were shut and she felt a faint smile come to her lips. Do you know – Stefan's mental voice was startled, astonished – I remember something else! From when I was very young, maybe three or four years old. My father had a terrible temper, especially right after my mother died. And back then, when I was little, and my father was furious and drunk, Damon would deliberately get in between us. He'd say something obnoxious and – well, my father would end up beating him instead of me. I don't know how I could have forgotten about that. I do, Elena thought, remembering how frightened she had been of Damon when he'd first turned human – even though he'd put himself in between her and the vampires who wanted to Discipline her in the Dark Dimension. He had a gift for knowing exactly what to say – how to look – what to do – to get under anyone's skin. She could feel Stefan chuckle faintly, wryly. A gift, was it? Well, I certainly couldn't do it, and I can manage most people, Elena replied softly. Not him, though. Never him. Stefan added, But he was almost always kinder to weak people than to strong ones. He always did have that soft spot for Bonnie†¦ He broke off, as if frightened he'd ventured too near something sacred. But Elena had her bearings now. She was glad, so glad, that in the end Damon had died to save Bonnie. Elena herself needed no more proof of his feelings about her. She would always love Damon, and she would never al ow anything to diminish that love. And, somehow, it seemed fitting that she and Stefan should sit in her old bedroom and speak of what they remembered of Damon in hushed tones. She planned on taking the same thing up with the others tomorrow. When she final y fel asleep in Stefan's arms, it was hours after midnight.

Healthy Living

Ms. Black Anat-6 21 March 15, 2013 Healthy Living Many factors affect your health. Some you cannot control, such as your genetic makeup or your age, but you can make changes to your lifestyle. This book includes a population health approach and focuses on the various environments and settings which influence healthy living, such as nutrition, personal care and hygiene, physical fitness home environments.Both physical activity and healthy eating are essential to good health throughout life, to increase resiliency and to protect against disease and disability. They are needed to lower the risk of chronic diseases and promote optimal health. In children, sufficient levels of physical activity and healthy eating are essential for healthy growth and development. Firstly, by choosing healthy eating habit, people will gain many rewards. To have good nutrition, people should reduce the amount of fat and in particular, the amount of saturated fat.People should increase the intake of fibre-ric h, starchy foods, such as bread, potatoes, pasta and rice by half as much again, reduce the average salt intake by around one-third, and increase the amount of fish eaten to at least two portions each week, one of which should be an oily fish. Besides that, practicing good personal hygiene is smart for two reasons. First, it helps to prevent people from catching and spreading illness and disease. Second, it helps people feel good about themselves and their body.Then, being physically fitness not only helps people live healthy in lives, it also helps people live longer. The best way to keep physical activity and exercise a permanent part of one’s life is to make it fun and enjoyable. Finally, all of the issues that evolve out of the interaction between people and the environment fall under the umbrella of environment health. This book discusses the many different risks that threaten the environment as well as ways to protect the environment and those who live in it.

Avatar movie Review Example | Topics and Well Written Essays - 750 words

Avatar - Movie Review Example Anthropology is the scientific research of human beings and their ancestors. â€Å"When his twin brother is killed, disabled ex-Marine Jake Sully is recruited to aid a mining expedition on the distant jungle moon of Pandora as only his DNA will bond with the alien hybrid body, known as an Avatar, which allows humans to breathe the toxic air.The initial impression one gets about the Na’vi aside from their alien trappings, is that they are a primitive race. Primitive is a relativistic term and here it is used to mean that they are technologically backwards compared to the humans who come to Pandora. The Na’vi subsequently faced with the challenge that comes when a tribal community comes into contact with a more technologically advanced civilization. The humans who come to Pandora are there to mine the local minerals to be used back on their home planet. This begs the question, ‘what happened to their home planet?† The Na’vi cultural practices resemble those of other pre technology civilizations. They live in small villages spread throughout the planet. They have developed a form of religion, a system of government and have learned hunting as a source of sustenance. They also have their own language used for communicating with one another, and with the local wildlife using their body language combined with high pitched shouts and clicks.The language is more intuitive more than descriptive. For example when they say â€Å"I see you,† it mostly means that they see into you rather than a visual interpretation of the observed object or individual. Their language is also accompanied with hand signals and movements to emphasize emotions and ideas communicated (Chris, 2012). As history has attested time and time again, when a more technologically advanced civilization comes into contact with what they perceive to be a primitive society, the humans take it upon themselves to â€Å"civilize† the Na’vi. Motive aside, th e impression that what the humans have in terms of technological advancements is I think misguided. The Na’vi are not the one who have bled their home planet dry, and have then travelled halfway across the galaxy in search of the aptly named mineral unobtainium. In the aim of civilizing the natives, the human open school, teach the Na’vi their language, they also try to trade their medicine and food with the Na’vi with the aim of obtaining the unobtainium (Chris, 2012). The Na’vi on the other hand feel that the humans are misguided, and also unsuccessfully try to teach them their way of life until the arrival of Jake Sully. There is a mutual sense of ethnocentrism within the two communities, and whether it is justified is a matter of opinion. The humans feel that their way of life is superior to the Na’vi while the Na’vi feel that their way of life is the only way to live harmoniously with their environment. The Na’vi live in the jung les of Pandora, their main food source is the jungle. They are hunters and gatherers. They also domesticate the local wildlife and use it as a means of transport. They also use the animals to hunt and defend themselves. As with most hunter gatherer communities, prowess in hunting is highly valued and strength greatly affects the individual’s status within the community. They have a sense of brotherhood and oneness with their prey since it is part of them, part of the jungle and thus part of Eywa. They do not needlessly kill their prey and only hunt what they eat. They even go out of their way to reduce instances of confrontation between themselves and the hostile wildlife in the jungle. This