Irrigation as a Tool for Frost and Freeze Protection Essay -- Agricult

For years now farmers and researchers have understood the value of applying water to crops during periods when the temperature drops below 32oF (0oC). The temperature of 32oF is the freezing point of water and is the temperature at which crops start to become damaged due to the formation of ice crystals in their tissue cells. The point that this starts to occur is considered the crops critical temperature. The critical temperature usually is slightly lower than the freezing point of water and depends on the duration at the temperature. For example, in citrus the critical temperature at four hours is 28oF. This means that a citrus tree can stand a temperature of 28oF for four hours before sustaining damage. After four hours the damage is proportional to the time that the temperature remains below the critical temperature. Temperatures below 28oF for a short period of time (one or two hours) will cause only minimal damage. Temperatures over 28oF can be tolerated for extended periods of time with only minor damage (partial leaf burn, partial defoliation, etc., but no wood damage). Other factors such as stage of growth (if the plant is in early stages of growth or mature), fruit set (whether the crop is still on the plant or not), dormancy (whether the plant is actively growing or is dormant), plant water content (whether the plant is under water stress or not) and overall plant health will influence the critical temperature for a specific crop. There are three ways that water can transfer heat for freeze protection. The first way is through radiation. Water pumped from wells will be introduced into the field at a much higher temperature than the surrounding air temperature (in Florida the temperature for water coming from a well is... ...rmittent coverage. References Hochmuth, G.J., S.J. Lacascio, S.R. Kostewicz, and F.G. Martin. 1993. Irrigation Method and Rowcover Use for Strawberry Freeze Protection. J. Amer. Soc. Hort. Sci. 188(5):575-579. Miller, F. 1977. College Physics. Harcourt Brace Jovanovich, Inc. New York. Parsons, L.R., and T.A. Wheaton, 1987. Microsprinkler Irrigation for Freeze Protection: Evaporative Cooling and Extent of Protection in an Advective Freeze. J. Amer. Soc. Hort. Sci. 112(6):879- 902. Parsons, L.R., T.A. Wheaton, N.D. Faryna, and J.L. Jackson. 1991. Elevated Microsprinklers Improve Protection of Citrus Trees in an Advective Freeze. Hortscience. 26(9):1149-1151. Rieger, M., F.S. Davies, and L.K. Jackson. 1986. Microsprinkler Irrigation and Microclimate of Young Orange Trees During Freeze Conditions. Hortscience. 21(6):1372-1374.

Personal Ethics Essay

When faced with a decision which requires an ethical framework, my usual pattern of decision making follows a pattern of reflection and introspection. The introspective element is both cerebral, that is: based in a rational analysis of the issue or matter at hand, and also intuitive, of which is to some degree an assessment of the emotional components of the decision at hand. However, intuitive introspection, at least in my opinion, transcends the boundaries of rationality as we understand it, and it even transcends our understanding of emotional responses, so intuition, although critical to my own decision making process is a slightly difficult aspect to illuminate. I once read the following paradigm somewhere. The origin of the paradigm is lost to my present memory, but the paradigm was this: whenever you are faced with a truly perplexing â€Å"yes or no† or â€Å"do or don’t† or â€Å"either or† decision, and you really can’t seem to make up your mind, flip a coin and assign â€Å"heads† to one outcome, and â€Å"tails† to the other. Now, when the result of the coin flip is shown, assess your feeling about the result and you will see what you wanted to do all along. In other words, say your choice is between going to a movie or playing a video game with your friends online. You can’t make up your mind which would be abetter choice, so you flip the coin, assigning â€Å"heads† to going to the movie, and â€Å"tails† to playing video games, vowing to abide by the result. Now, let’s assume the result of the coin flip is â€Å"tails† — staying home to play video games — and you feel excited, pleased and happy right away without thinking. Then staying in is what you wanted all along. If the coin-flip result of â€Å"tails† — staying home to play video games — made you want to flip the coin again for a different result, then you would know the same thing, that what you actually wanted to do was stay home and not go out to the movie. That is not to say that I make my decisions, trivial or profound, based on a coin flip! What I am driving at is that we often have intuitive feelings that lurk below the level of our rational consciousness and we can access this intuition in some cases when making decisions. As someone who has little faith in absolute ethical systems, or in a morality which is based on abstract philosophy, I like to include my own feelings, as well as my rational understanding of ethical concepts when I am faced with decisions. The underlying principles which inform the way I live my life are also drawn from the aforementioned notion of intuition or deep-introspection. For example, if I refuse a certain job offer, or even the offer of friendship on specific occasions this may have less to do with something which could be expressed in a linear fashion: the job was too demeaning, or that person had the wrong hair-style or hobby, but with something that might be more difficult to articulate clearly, but which is much more crucial than any superficial notions that might be viewed by some as important gauges or cues. In short, I don’t have any kind of â€Å"maxim† or concrete set of principles — edicts, I believe they are called — but rather a sense of personal disposition and emotional bearing. For example, I don’t like to hurt people’s feelings; viscerally: I just do not like to witness their pain so I avoid doing so when I can manage it. On the other hand, I take a rather dim view of altruism or the notion of helping people or giving them charity. I feel awkward placing myself in a position where I am apt to start pitying or feeling sorry for people; I myself dislike being pitied or felt sorry for, so I guess I assume it is the same for others. I tend to adopt the pursuit of happiness and personal joy (not to be confused with hedonism) as key aspects of my world view. That is, I am, at heart, an optimist who dislikes â€Å"whining† and cynicism and the pursuit of superficial self-gratification at the expense of others. That certainly does not mean that I advocate â€Å"selflessness† — whatever that term may indicate as a way of life, but rather, that I view joy, success, and fulfillment at least to some degree to be communal in nature. It is necessary that all acknowledge that everyone is a part of the human experience, no matter who or what they are. there are no exceptions. In my work, I try very hard to be both competent and respectful of those who I work with and for — but I often find it difficult to refrain from voicing my opinions, especially when I believe there is a possibility that my input may be helpful. I realize that work is a primary form of self-expression and self-fulfillment in life. My idea is that most people either love their jobs and derive a large part of their self-identity and worldly power through their jobs, or they hate their jobs and are constricted, limited, and oppressed by them. So, to my mind, it is crucial that you endeavor as much as possible to find a job that puts you in the former rather than the latter category because so much of life keys off of one’s work. One thing that I am convinced about is that everyone should bring the same emotional involvement and enthusiasm to their jobs as they very often bring to their hobbies, just as I believe most people should try to bring the same level of integrity and competence to their personal relationships as is usually required by their jobs. Obviously, I would not advocate the pursuit of money as a reliable indicator of whether or not a job is the right or wrong job. It is much more important that a job facilitate one’s sense of self-esteem and emotional security than whether or not the financial rewards are above and beyond â€Å"fair. † That said, a fair salary is always indicated because without it, maintaining self-respect and self-esteem is made more difficult. While there is no single â€Å"litmus test† for whether or not one’s work is the right work for them, the emotional and intuitive aspects of decision making can help as much in assessing a job’s strengths and weaknesses as a cold rational evaluation of the facts.

Diabetes Mellitus Essay Example

Diabetes Mellitus Essay Example Diabetes Mellitus Paper Diabetes Mellitus Paper The Type 2 diabetes mellitus (also known as ‘adult-onset diabetes’ or ‘non-insulin diabetes’) is a chronic condition characterized by a rise in level of glucose (sugar) in blood, due to the abnormal manner of metabolism of insulin by the body, and body becomes less resistant to the effect of insulin (a hormone produced by the pancreas that regulates the level of sugar in the body). The condition develops widespread symptoms and if untreated can make the person die. Type 2 diabetes is the most common form of diabetes, the other form being gestational diabetes and type 1 diabetes. One of the most preventable forms of diabetes is type 2 diabetes mellitus, but the disorder is still in rise due to sedentary lifestyle and dietary changes followed by the you and me. It is important to remember that there is no cure or hope for it, for the disorder, and lifestyle, dietary and medical changes may be required for the rest of somebody’s life. The condition more often occurs in adults, but recently there has also been a rise in the children. About 8 to 45 % of all new diabetes cases found in children are from the pediatric age groups (Silvio E. Inzucchi, 2007, Kevin Peterson, 2007, Eric Felner, 2008). Exact cause for type 2 diabetes is not understood by many, but it may usually be a decrease in the insulin secretion, resistance to insulin secretion, improper manner of the body of using insulin, or a combination of several factors, may play a role in the development of the disorder. When the glucose is consumed in the diet, it is absorbed into the bloodstream, and once the sugar enters the blood, insulin helps to control the level. It controls the manner in which the cell would be utilizing glucose for metabolism. Insulin helps to decrease the level of the glucose and increasing storage as glycogen in the liver and the muscle cells. Once the level of glucose in the blood drops, the insulin level also decreases. From the liver, the glucose may be transported to other parts of the blood, once the insulin level decreases. In individuals suffering from diabetes type 2, the insulin may be defective in quality or the cells may be resistant to the action of insulin, leading to improper usage by the cells and a rise in the blood. Besides, in diabetes, the muscle and the fat tissues tend to react abnormally to the insulin (Silvio E. Inzucchi, 2007, Mayo, 2007, Elizabeth H. Holt, 2008). In the general population of US, about 7 % are affected with Type 2 diabetes. More than 15 % of the elderly population is affected with diabetes type 2. Hispanics, Native Americans and African-Americans are at a higher risk of developing diabetes type 2. The incidences of the disease may be two to three times than that of White people. In actual sense, several of these populations are resistant to diabetes in their homeland. However, once they have migrated to the US, the inability to adapt to the US diet and lifestyle increases them to develop the disease. Diabetes type 2 is a disorder that tends to occur more often in families. Having an affected mother or father increases the risk of developing the disorder (Silvio E. Inzucchi, 2007, Preeti Kishore, 2008, Elizabeth H. Holt, 2008). There may be several risk factors for developing diabetes including:- Having a close family member or relative suffer from the disorder Having a twin identical twin – 100 % risk (higher risk than a non-identical twin) Elderly age group (especially people crossing 65 years) Obesity or overweight Sedentary lifestyle Lack of exercise Those with high waist to hip ratios History of gestational diabetes Having babies weighing greater than 9 pounds Presence of heart disease High cholesterol levels in the blood History of polycystic ovarian disease History of an impaired glucose tolerance test result Hypertension Certain races or ethnic groups History of prediabetes (Silvio E. Inzucchi, 2007, Preeti Kishore, 2008, Elizabeth H. Holt, 2008, Mayo, 2008) Method(s) of diagnosis Diagnosis of diabetes type 2 is made based on that person’s history, symptoms, signs, physical examination, urine sugar tests, blood sugar tests, oral glucose tolerance tests, hemoglobin A1C tests, and other tests. A fasting blood sugar of above 125 mg/dl and a random blood sugar of 200 mg/dl of blood are diagnostic of diabetes mellitus. If the glucose level is above 200 mg/dl of blood after two hours of glucose tolerance test, it is suggestive of diabetes. HBAIC tests are also very useful not only to determine the past levels of glucose over the last 3 to 6 months, but also to monitor the condition (Elizabeth H. Holt, 2008, Mayo, 2007, Silvio E. Inzucchi, 2007). Symptoms and complications of the disorder An individual who develops type 2 diabetes can have a range of signs, problems and symptoms. These usually develop due to the increased levels of glucose present in the blood or due to complications. Some symptoms of type 2 diabetes include blurriness of the vision, polyphagia, polydipsia, tiredness, hunger, polyuria, weight loss, loss of appetite, drowsiness, nausea, poor tolerance to exercise or increased physical activity, dehydration, frequent infection, mental confusions, seizures, etc. Bladder, vaginal and skin infections are frequent in diabetic individuals or wounds take very long to heal. To get rid of the excess sugar in the blood, the body eliminates the sugar in the urine once it reaches the level of 180 mg per dl of blood. To get rid of the excess sugar in the blood, water is lost, leading to polyuria. The individual would have to consume high amounts of water in order to meet this water shortage. As there is loss of calories through urine, the individual tends to lose weight. Hence, hunger is a common. Due to the excessive present of sugar in the blood, the fluids tend to accumulate and even in the tissues of the eyeball, there is high intra-ocular pressure leading to blurring of vision. In certain cases, especially when high amounts of glucose is lost in the urine, there would be a drop in the blood glucose level leading to hypoglycemia leading to several symptoms such as tiredness, fainting, breathlessness, etc. Acanthosis nigricans is a condition characterized by the formation of dark shiny patches on skin folds (Elizabeth H. Holt, 2008, Mayo, 2007, Preeti Kishore, 2008, Eric Felner, 2008, Kevin Peterson, 2007). People affected with type 2 diabetes can develop several symptoms especially during the later stages of the disease. Several organs including the heart, lungs, brain, blood vessels, eyes, kidneys, etc are troubled. The blood sugar levels may often drop especially during periods of stress leading to a condition known as ‘hypoglycemia’. Diabetic hyperosmolar coma is a condition characterized by a rise in the blood glucose level resulting in confusion, seizures, seizures, sweating and drowsiness, etc. In individuals who tend to fast more, fat is broken down excessively resulting in the production of toxic substances ‘ketones’. The individual may develop several symptoms such as nausea, vomiting, fever, stomach pain, sickly ketone odor, etc. This condition is known as ‘diabetic ketoacidosis’. The heart and the blood vessels are also affected resulting in coronary heart disease, angina, stroke, hypertension, etc. Risk of stroke increases several fold in individuals suffering from diabetes. The blood vessels that supply the nerve endings are also affected resulting in nerve disorders. The individual would have tingling, burning sensations, numbness, etc, in various parts of the body including the fingers, toes, etc. Besides, the nerves of the autonomic nervous system may also be involved. Kidney damage may also occur resulting in kidney failure. The blood vessels of the eye may also be involved resulting in blindness. The bone density decreases leading to osteoporosis (Mayo, 2007, Preeti Kishore, 2008, Elizabeth H. Holt, 2008). Treatment of the disorder There are several modes which are required to help treat the condition. However, currently no cure is available for diabetes. Some measures include:- Monitoring glucose levels to ensure that the sugar levels are within control. Lifestyle changes including those involving diet (avoid sugars), physically active, keeping away from alcohol and tobacco, and managing stress more effectively. Insulin therapy to help control the level of sugar in the body. It is given in the form of injections. The individual can use subcutaneous injections or an insulin pump. Several forms of insulin fast-acting, slow-acting, intermediate forms or combinations are available which can help to control the blood glucose levels as and when required. Oral hypoglycemic agents are required because insulin may not be very effective in type 2 diabetics. The two groups of drugs which are utilized include sulfonylureas and biguanides. Sulfonylureas encourage the pancreas to produce greater amounts of insulin, whereas biguanides improve the reaction of the cells and tissues towards insulin. Insulin can also delivered in the form of nasal sprays. Foot care is every essential for diabetics as a small wound can result in gangrene and leg amputations (Silvio E. Inzucchi, 2007, Kevin Peterson, 2007, Eric Felner, 2008, Mayo, 2007, Preeti Kishore, 2008). Methods of prevention There are several means which can help to prevent the diabetes. The measures should especially be followed when the risk of the diabetes are high. The individual should consume healthy food, rich in proteins, vitamins and minerals. The intake of fats and carbohydrates should be controlled. Physical activity may be required for about 30 minutes everyday. Individuals who are overweight or obese should consider losing weight. A weight loss of 5 kilograms should significantly help reduce the risk of developing diabetes. Oral hypoglycemic agents have also been administered in individuals with high risk of developing the disease, and studies have shown that it helps to prevent the disease to certain extents (Eric Felner, 2008, Mayo, 2007). Directions for future research Current field of research is the introduction of insulin-producing cells in various organs of the body so that the level of insulin can be improved and help control diabetes. However, immune cells can destroy these transplanted cells and hence require immune-suppression. Newer techniques are aiming to prevent the need for immune-suppression (Preeti Kishore, 2008). Several research studies are trying to determine the cause for the higher incidences of diabetes in the pediatric population. They are also defining effective ways of reducing the risk for type 2 diabetes in these populations (Kevin Peterson, 2007). Conclusion Diabetes type 2 seems to be a disease which has affected mankind from a long time, and today it is affecting the even our children. Modern and westernized lifestyles are only increasing the chances of developing the disease, and science cannot help lower the incidence of it. Studies should concentrate on increasing the preventive aspects of the disease. Today diabetes groups are concentrating heavily on developing newer drugs and insulin introduction methods to treat the disease. However, it is important to note that preventive methods can be utilized effectively, even in the high risk groups. Felner, E. and F. Kaufman. â€Å"Type 2 Diabetes in Children. † The Hormone Foundation July (2008). (Journal) Holt, Elizabeth H. â€Å"Diabetes. † 17 June 2008. Medline Plus. 6 December 2008 nlm. nih. gov/medlineplus/ency/article/001214. htm (Web site) Holt, Elizabeth H. â€Å"Type 2 Diabetes. † 17 June 2008. Medline Plus. 6 December 2008 nlm. nih. gov/medlineplus/ency/article/000313. htm (Web site) Inzucchi , Silvio E, and Robert S. Sherwin. Goldman: Cecil Medicine. Philadelphia: Saunders, 2007. (Textbook) Kishore, Preeti. â€Å"Diabetes Mellitus. † June 2008. Merck Manual. 6 December 2008 merck. com/mmhe/sec13/ch165/ch165a. html (Web site) Mayo Clinic Staff. â€Å"Type 2 Diabetes Introduction. † 24 October 2008. Mayo Clinic. 6 December 2008 mayoclinic. com/health/type-2-diabetes/DS00585 (Web site) Mayo Clinic Staff. â€Å"Type 2 Diabetes Symptoms. † 24 October 2008. Mayo Clinic. 6 December 2008 mayoclinic. com/health/type-2-diabetes/DS00585/DSECTION=symptoms (Web site) Mayo Clinic Staff. â€Å"Type 2 Diabetes – Test and Diagnosis. † 24 October 2008. Mayo Clinic. 6 December 2008 mayoclinic. com/health/type-2-diabetes/DS00585/DSECTION=tests-and-diagnosis (Web site) Mayo Clinic Staff. â€Å"Type 2 Diabetes – Treatment and Drugs. † 24 October 2008. Mayo Clinic. 6 December 2008 mayoclinic. com/health/type-2-diabetes/DS00585/DSECTION=treatments-and-drugs (Web site) Peterson, Kevin. â€Å"Management of Type 2 Diabetes in Youth: An Update. † American Family Physician 76. 5 (2007): 658-664. (Journal)