Old Yeller Essays - Rabies, English-language Films, Films

Old Yeller OLD YELLER This was one of my favorite books during my childhood days. The book is a classic, and Disney later made it into a motion picture. the storys climax develops quickly by telling stories and adventures of a boy named Travis and his old stray yellow dog named Yeller.At the introduction of the book Travis is plowing corn in the garden when an old yellow darts bye and causes the mule to jump. He chases the dog out of the garden and curses at him. Then a few days later the stray dog ate some of the deer meat that was very important for the familys survival. Travis was very angered and threatened to kill the mischievious yellow dog, but his younger brother, Arliss, would not allow this. There are many more adventures that the book tells of Old Yeller throughout the story and I am going to put a heavy emphasis on the three that I enjoyed the most. First of all Travis and his brother Arliss were out in the forest with their mother and were cutting wood. This was going to be used to mend a fence that had broke in the yard. While Arliss was off on his own exploring that day he ran across a small bear cub and began to play with it. Travis yelled at him to turn the cub loose. Arliss could see the mother bear coming, but he was too frightened to turn the cub loose. Travis and his mother ran down the hill to assist Arliss, but they knew that they were going to be too late. All of the sudden Old Yeller came like a flash and attacked the bear from her side. The bear turned quickly to fight the dog off. Travis hoisted Arliss up and threw him to their mother. Travis then began to run and shout at the two fighting animals. The bear tucked its tail and left. Old Yeller had saved the life of Arliss and they were all very appreciative of what Yeller had done. One of the next highlights in the book is when Old Yeller knocks down Rose, the milk cow. Travis and Old Yeller were out in the woods looking for Rose because she had been gone for three days without a trace. Rose had been expecting to give birth at any time and went off by herself to do this. Travis finally located Rose and she had already given birth to the calf. Travis chased after the calf to lift it up. While attempting to do this Rose charged towards him. It was at that time that Travis began to realize what a great dog he really had. Old Yeller dashed and knocked down Rose then as she charged time and again at Yeller the dog tripped her up several times. Later on that day while Travis was milking Rose she kept kicking the milk bucket over and would not allow Travis to milk her. In order to put a stop to this incident Travis called over Old Yeller to keep Rose in line. Old Yeller stood directly in front of Rose and thrashed forward staring at her. The heifer was so frightened that she did not even try to budge. The final adventure of Old Yeller that I would like to portray is very tragic and sad. It begins with Rose contracting a disease called hydrophobia. This is an extremely fatal disease which brings fourth foaming at the mouth of the animal. Rose, the cow, is killed and then burned so that no other animals would eat her and spread the disease. Mama and her daughter Lisbeth were burning the cow when a gray wolf tried to ambush them. Old Yeller came to their rescue like a bolt of lightning and wrestled with the wolf. Both animals were biting and clawing at each other. Travis then retrieved his rifle, took aim, and shot the wolf. The wolf also had hydrophobia so that meant that Old Yeller had the chance of obtaining the sickness as well. After this incident they were forced to lock Old Yeller up in a woodshed for a few weeks while keeping an eye on him to make sure that he did not become ill.

The Diffusion of a Cell

The Diffusion of a Cell Summary The primary goal of this research was to evaluate the effects of cholesterol on diffusion properties. Scholars use multiple methods to show the movement of the cholesterol particle to diffusion point. The use of solvents and fluorescence microscopy aimed to show the biophysical mechanism in the diffusion process.Advertising We will write a custom essay sample on The Diffusion of a Cell specifically for you for only $16.05 $11/page Learn More Cholesterol is an important player in the lipid composition comprising the cell membrane. Alteration in cell membrane and cholesterol concentration affect receptor protein as well as the cell. By changing many proteins, cholesterol favors the inactive conformation of the photoreceptor rhodopsin. Cholesterol has a few other purposes such as the functioning of the nicotinic acetylcholine receptors. The objective of this study was to showcase the importance of diffusion to the cell growth, survival, motility adhesio n, and proliferation. Cholesterol plays a key role, and its depletion may lead to a decrease in integrin that affects the functionality of the cell. The research divulged the underlying biophysical system behind cholesterol’s impacts on the diffusion of ever-present group of receptors known as integrins. General Comments The biophysical mechanism process in cholesterol may not have been well known. Nevertheless, by use of live cell imaging and with the help of a combination of solvents one can identify the working behind the process. The goal of this research was to show the effects of cholesterol on living cells. Besides, the study aimed at showing the influence of cholesterol on human body that comprises numerous cells (Geffen 146). The study achieved this goal through the use of Single Particle Tracking that entails observing the diffusion of a particle in the cell. The researchers used photobleaching and enhanced the particles using fluorescence. The research also focused on restoration of cholesterol-depleted cells with exogenous Cholesterol. The study signified the ability of epicholestrol to substitute cholesterol (Finegold 106). The rate of diffusion is measured using Single Particle Tracking (SPT) after photobleaching. The materials and method utilized in the research included a cell culture and bleaching solvents. The method used involved cholesterol depletion, restoration, and substitution. The researchers exposed the cell to the heat as a way to get sufficient results. The cells were first washed in a serum-free medium to remove cyclodextrin (Wilson and Hunt 88). There was also extraction of lipid to measure the quantity of cholesterol. Imaging was done using a PhotonMax camera to assist in the Single Particle Tracking. The images showed total cellular and membrane cholesterol concentration as measured by liquid chromatography-mass spectrometry.Advertising Looking for essay on biology? Let's see if we can help you! Get your first pap er with 15% OFF Learn More The study signified the importance of imaging process in â€Å"generating reliable average diffusion coefficients† (Dudek 67).  The study’s findings showed that a complete recovery of membrane cholesterol cannot be achieved despite a high total cellular cholesterol concentration. The Single Particle Tracking approach demonstrated the dynamics of integrin under different conditions. It showed a decrease in the amount of mobile integrin after cholesterol depletion and increase after cholesterol restoration. It may be argued that this experiment showed the effect of the single dot in the diffusion measurements as showed by STP. The integrins bound to ligand-coated quantum dots display the effects of diffusion. The study proved that integrin distribution is confined to cholesterol zones. According to the study, cholesterol depletion influences integrin diffusion coefficient. The instantaneous distribution varies significantly at different times in the confinement regions. The conclusion is that cholesterol regulates integrin diffusion by changing the physical properties of the membrane. Epicholestrol yielded similar integrin diffusion properties as those measured after restoration. The research verified that there is no difference in the average diffusion coefficient of mobile integrins inside or outside the confined zones after restoration. Criticism The rate of diffusion of a cell allows it to grow and multiply where necessary. The research shows the distribution in cells and their membrane. Lipids make up a great part of the cell and cholesterol is a major component of lipids. By measuring the rate of diffusion through the membrane of a cell, one can identify the absorption rate. Such an experiment can shed light on nutrient uptake in living cells that affects cell growth (Barrett and Donowitz 157). The methods used in this research will go a long way towards facilitating the establishment of different diagnostic and treatment procedures. They will enable doctors to establish appropriate diagnosis of patients in troubling cases. In nutrition, the levels of cholesterol in a particular diet are necessary, and the rate of diffusion in cells can determine how much cholesterol a diet requires. The experiment recognized and identified the effects of other biophysical processes that may be attributed to diffusion (Starr et al. 89). In future, the research can be used in understanding cell metabolism and development in cancer research.Advertising We will write a custom essay sample on The Diffusion of a Cell specifically for you for only $16.05 $11/page Learn More The research also brought out the aspect of diffusion rate of integrin and cholesterol. Besides, it pointed out other ways in which cell metabolism can be evaluated using Single Particle Tracking method. The research was well carried out, and the cells were treated to prevent contamination. The results were conclusive and supported using scholarly and peer-reviewed articles. The imaging process was clear and precise. The future research should focus on nutrition and cell biology in a deeper sense. Barrett, Kim, and M. Donowitz. Gastrointestinal Transport, San Diego: Academic Press, 2010. Print. Dudek, Ronald. High-Yield, Cell Molecular Biology, Philadelphia: Lippincott Williams Wilkins, 2006. Print. Finegold, Leonard. Cholesterol in Membrane Models, Boca Raton, Fla.: CRC Press, 2007. Print. Geffen, Amit. Cellular and Bimolecular Mechanics and Mechanobiology, Berlin: Springer, 2011. Print. Starr, Cecie, Ralph Taggart, Christine Evers and Lisa Starr. Biology: The Unity and Diversity of Life. Australia: Brooks Cole, 2012. Print. Wilson, John, and T. Hunt. Molecular Biology of the Cell, New York: Garland Pub., 2011. Print.Advertising Looking for essay on biology? Let's see if we can help you! Get your first paper with 15% OFF Learn More

Using Cell Phone While Driving Assignment Example | Topics and Well Written Essays - 1250 words

Using Cell Phone While Driving - Assignment Example Thus, when drivers are seen dialing or talking on the cell phone while driving, people especially their passengers cannot be comfortable just sitting in their seats but are more than irritated and react. When cell phone use is mixed with driving, people support the idea of giving penalties to motorists who are ignoring the law of its prohibition while their wheels are in motion. This is deemed necessary especially for younger age drivers as they are the group who most uses cell phones while driving either at night or during the day (Vivoda, et al. 1). In Virginia, when a teen is caught speeding with a cell phone on her hand, she could be fined an additional of $50. In New Jersey, She is fined $ 100 to 250 (Rusell, Michael 1). To the careful drivers and concerned citizens, additional fines are just and necessary to remind drivers to get rid of the cell phone while driving for them to concentrate on the road. Doing two things well at the same time is impossible as claimed by Douglas Al exander, a transport secretary (Topsfield, James 3). Divided attention may distract the driver’s ability to recognize or react appropriately to any number situations which could happen on the road such as the crossing of pedestrians from elsewhere, speeding, or the change of traffic lights and the likes. In addition, fines may tell the driver that the consequence of his negligence use of the cell phone on the road is too great to ignore. Penalties are said to reduce this form of offense. Although this may be true, there are still many motorists who violate the law of cell phone use. Many believe that the fine is not enough to have teeth on violators. They could easily pay the amount and be freed of the offense.