IS cyber bullying an increasing problem for young people in Australia Essay

IS cyber bullying an increasing problem for young people in Australia - Essay Example Ken Rigby explained that this so-called cyber-bullying may be considered as an extension of traditional covert forms of bullying and that this time this is achieved through the use of computers, the Internet and other electronic technology. (p. 112) It is important to underscore that even with the technological context, bullying is still the same: it occurs when a child is subjected to a steady stream of offensive and threatening acts and messages causing stress and fear and without any power to stop it. The physical separation of the bully from his victim is no longer significant particularly in terms of the frequency, scope and depth of harm being given by bullies and experienced by the victims. In a study conducted by Campbell in 2005, it was revealed that approximately 14 per cent of Australian children have been bullied, receiving distressing messages through emails, mobile phones, websites, internet forums and chat rooms. This figures are significant especially amidst the current trends characterized by the increasing rate of cyber bullying and the dangerous effects of this form of aggression as experienced by children across the globe. That is why as in other parts of the world, cyber bullying has become an issue of primary importance in Australia, particularly requiring immediate action from authorities. Mobile phones suddenly became an indispensable accessory for children students as the gadget start to offer multimedia features besides the basic calling functionality. Text messaging also contributed to its appeal among the young. This is the reason why it proved to be a tool in perpetuating bullying as bullies send text messages and mobile phone photos and videos that can be uploaded to the internet for public consumption either to offend, humiliate and hurt other children. According to Eli Cohen, when used for bullying this

Fast Food the Unhealthy Road Taken Essay Example | Topics and Well Written Essays - 2000 words

Fast Food the Unhealthy Road Taken - Essay Example This is a clear indication that most people  consume  fast foods (Knechtges 2011). Currently, it is true that most people are  busy  due to  commitment  with many responsibilities. As a result, time spent while cooking food has reduced drastically. Therefore, the only option that is convenient  to the majority is the use of fast foods. This has enabled t fast food industry to be successful in recent years. Moreover, the industry’s ability to deliver a consistent quality of food in a large geographical area, and at a fair price has contributed significantly to its growth. Frequent users, of fast foods state that they  like  taking them because of  limited  time that does not  allow  them to  move long distances in search for alternatives. However, one of the most  essential  issues that most people forget concerning fast foods is their lack of  nutrition  value. Considering there are families, who depend entirely  on fast foods throughout t he day without worrying about the nutritional value or the long-term impacts of fast foods on an  individual’s health. One of the main  impacts  related with fast foods is that it makes one  overweight  i.e. obese. This is so because fast foods have  low  fiber concentration, high concentration of carbohydrates, and high level of fat  concentration. These are the elements or characteristics making people consuming fast foods to put on weight.  According to research, it is clear that, most countries where  fast  foods  are highly consumed, majority  of  the population are overweight or obese.  In addition,  most of the  young population  ends up becoming obese or overweight. Over time, obesity or overweight leads to other health problems especially of the heart.... This essay approves that people who prefer to go for a high proportion that may not be healthy instead of considering a healthy and reasonable amount end up endangering their lives. Recently, there has been negative publicity about fast foods. As a result, people have come up with alternatives to solve negative issues associated with fast foods. In addition, the fast foods restaurants have incorporated fruit juice, fruits, and salads alongside the meals or foods sold in their restaurants. A majority of health foundations has approved this because their intention is to ensure that customers consume a balanced and nutritious diet. However, despite attempts to offer a balanced diet, prices charged are high compared to those charged for the unhealthy options such as fast foods. As a result, majority of customers does not consider buying them, but instead prefer the unhealthy option. In most cases, due to the addictive nature of unhealthy foods, young children are enticed to make unhealth y choices. This report makes a conclusion that regular consumption of fast foods leads to significant health hazards. Although people are aware of this fact, incorporating change in their eating habits is not an easy task. Consequently, it is essential to commence change; it is essential to start with basic changes such as a reduction of the frequency of fast food consumption. Instead, people should focus on consumption of home cooked foods that have plenty of vegetables, fruits, and fresh foods. This way, cases of obesity or overweight will reduce. In cases of children, parents should encourage them to take fruits instead of fast foods thus reducing chances of overweight by the under age population.

Child Abuse and Neglect (CAN) Research Proposal

Child Abuse and Neglect (CAN) Research Proposal SYNOPSIS Child abuse and neglect (CAN) is a serious public health problem and occurs in varying proportions or magnitudes, resulting from burden imposed on children by parents or adults. Most adults often impose their wishes on children without any recourse on their feelings. This flagrant (deliberate) imposition more often than not instilled so much fear in the minds of thechildren(such as fear of early marriage, child labour, allegation of witchcraft and so on). Statistics indicate that, there were an estimated 896,000 substantiated cases of CAN in the United States (US) in 2004. Cases involving approximately 4.5 million children were referred to Child Protective Services throughout the country each year for investigation into allegations of abuse and neglect. Of these reported cases 30 per cent concluded were abuse and neglect of children (U.S. Department of Health and Human Services, 2008). Studies conducted by World Health Organization and International Society for Prevention of Child Ab use and Neglect (2006) showed that CAN has been and continues to be a major public health problem in the United States, Africa including Nigeria. Similarly, a study in Bauchi State showed that 59.8 per cent of schoolgirls were neglected from being enrolled in school (Targeted States High Impact Project- TSHIP, 2012). From the foregoing statistics, there is evidence of CAN, but the prevalence or extent may not have been determined. Child is a valuable asset to a good parent that needs to be protected. The Child Right Act (CRA) in UNICEF-Nigeria (2011)defined a child as a person below the age of 18 years. In this study, a child is a person between the ages of 10-20 years. These children at this age may be vulnerable to CAN because they may not have known their rights, of which these rights are supposed to be protected by parents and caregivers, but, unfortunately, mostabuse and neglect of children is carried out by people the children know and trust, such as parents, foster parents or parents’ partners, schoolmates, teachers, caregivers and employers. Following from above, children who fall victims are mostly abused by people they know and these CAN is either overtly or covertly. Such cases may not even be reported. This worrisome and unprecedented trend is more profound in developing nations of Asia and Africa including sub-Saharan Africa (UNICEF, 2009). Abuse, is a multi-dimensional phenomenon that encompasses a broad range of behaviours, events, and circumstances, unlike random acts of violence or exploitation (National Academies of Sciences (NAS, 2009). NAS described child abuse as all intentional actions that cause harm or create a serious risk or harm (whether or not harm is intended) to a child by a caregiver or other person who stands in a trusted relationship to the child. Child abuse is of different forms, namely: physical, sexual and psychological (emotional and/or verbal aggression. Therefore, physical, emotional and sexual abuse will be examined in this study. Another core concept in this study is child neglect. Child neglect means failure of caregiver to provide for a child’s basic needs. Child neglect manifests in various forms, namely: physical, emotional, educational and medical neglects, which will be examine. Demographic factors may be implicated in the perpetration of CAN. Demographic is the attributes or characteristics that define vividly the children’s population in Bauchi State in relation to abuse and neglect which may be use to predict an occurrence of certain behaviour. In this study, predictors refer to potential attributes or characteristics that can be used to foretell the occurrence of child abuse and neglect by means of special knowledge or inference. Examples of predictors in any given population may include: Age, gender, religious affiliation, marital status, location, family income/economic status, educational attainment and occupation. The current study uses the term â€Å"predictors† to describe potential variables contributing to child abuse occurrence, but makes no assumption as to the causal role of these variables. The respondents of this study are the children(secondary school ), whom acts are perpetrated by the parents. The reason for using children is that, parents may be reluctant to admit abuse or neglect. More so, children at the secondary school age are at the receiving end; they experience it, feel the impact and above all suffer the consequences of CAN. However, parents may be part of those who will provide information on the quantitative data. Prevention refers to actions that make something impossible or very difficult to happen. In this study, prevention refers to the systematic, coordinate actions taken by health personnel, social workers and others to reduce, delay or eliminate child abuse and neglect in society especially in Bauchi state, Nigeria. There are majors for preventing child abuse and neglect. Masures may be a plan that is intended to achieve a particular purpose .These may include: Primary, secondary and tertiary prevention measures, which will be examined in this study. This study will anchor on three theories; Developmental-ecological Model (DEM), Caregiver Stress Theory (CST) and Cumulative Risk Model (CRM). In Nigeria, Child Rights Act 2003 (CRA) incorporates all the rights and responsibilities of children; consolidate against physical, mental or emotional injury, abuse or neglect, maltreatment, torture among others. Regrettably, parents in Bauchi State sent children to hawk, farm for longer period of the day, girls are given out for early marriage, and children are treated with herbs when they fall sick instead of going to the health facilities for proper diagnosis and treatment. Parents regard these as means or acceptable ways of instilling discipline in children. Literature reveals that there is child abuse and neglect in Nigeria including Bauchi State. However, the prevalence or extent has not been ascertained. This is supposedly the situation in Nigeria and Bauchi state in particular. The question, therefore, arises and that is: what is the prevalence of child abuse in Bauchi state. This prompted the researcher to investigate the demographic predictors of CAN by parents and prevention measures in Bauchi State. The purpose of this study is to investigate demographic predictors of CAN and formulate preventive measures against its occurrence. Eleven objectives and eleven corresponding research questions and eight hypotheses where postulated to guide the study. The study will be of great benefit to Lawmakers, parents, public health educators, in-school and out- of-school children (youths) and the public in general. The result may likely reveal that girls suffer CAN than boys. This result will benefit social welfare workers, government and health educators. This will provide adequate knowledge and information to the government; social welfare workers and health workers on how to protect children against CAN in Bauchi State. The study will be conducted in Bauchi state, Nigeria. The study will cover demographic predictors of CAN and prevention measures against child abuse and neglect by parents in Bauchi State. The study is also delimited to forms of child abuse and neglect. These will be studied along side Predictors such as age, gender, religious affiliation, academic level, location, marital status parity and occupation and also be delimited to three theories Developmental-ecological Model (DEM), Caregiver Stress Theory (CST) and Cumulative Risk Model (CRM). The Literature will be reviewed under the following headings, Conceptual Framework;Theoretical Framework; Empirical Studies; and Summary of Review of Related Literature. The study will employ the descriptive survey design. Nworgu (2006); described this design as that permits the description of conditions as they exist in their natural setting. Adalio (2010) used descriptive survey design to conduct a study on demographic predictors of corporal punishment endorsement University of Florida. The descriptive survey research design, therefore, is most appropriate for this study. The successful applications of the design by the aforementioned investigator in her study suggested a possible success for use in this study. Bauchi state was created in 1976 out of the defunct North East state. Bauchi states have twenty Local Government Areas (LGA’s) and have six Emirates. The state spans two vegetation zones namely the Sudan Savannah and Sahel savannah. This made the state to be predominantly farmers. In addition, Bauchi state is endowed with a range of tourist attraction (Yankari game reserve and Sumu wildlife park) that captures and satiates the pleasure and sensibilities of visitors, therefore the â€Å"motto† : â€Å"Pearl of tourism† The population of the state is projected at 4.5million. Like all other ethnic groups in Nigeria, the state operates strong form of social organizations. These organizations (ethnic groups) have cultural similarities and share similar social occupational practice, festivals, naming ceremonies and a high degree of ethnic interaction especially in marriage. Culture and poverty play a key role in CAN in Bauchi state, because most parents give out their daughters in marriage as early as nine years, on the assumption that it prevents sexual promiscuity. The children more often than not, may not know their rights such as right to education, right to life, or even right to be protected. Even if they know their rights, they may not be able to stand for it for the fear of parental punishment. Besides, they still depend on their parents for the provision of their basic needs. This, therefore, makes them vulnerable to CAN in Bauchi State. The population for the study will consist of secondary school children students in Bauchi State which is estimated at 550,421(public and private). The sample size for this study will consists of one thousand five hundred and eleven (1511) secondary school students in Bauchi State Nigeria. This is in line with the suggestion of Cohen, Manion and Morrison (2011), that when a population size is five hundred (500,000.) and above at (95%) confidence level at (5% interval), the sample size should be six hundred and sixty three (663) and above will be the sample (see Appendix II). The multi-stage sampling procedure will be employed to draw up the sample size for the study (see appendix IV). The instrument for data collection will be the researcher structured questionnaire called Demographic Predictors of Child Abuse and Neglect Questionnaire (DePCANQ). The questionnaire will consist of 75 items consisting of four sections: A,B,C, and D, The validity of the instrument will be established by giving the draft instrument, the specific objectives and research questions to five experts, three from Department of Health and Physical Education and one each from Department of Sociology and Science Education (measurement and Evaluation Unit), all of the University of Nigeria, Nsukka. They will be requested to determine the suitability of the items and also to determine whether the items are in line with the purpose, and check for appropriateness of the items in terms of language used, objectives, research questions and hypotheses of the study. The experts’ corrections, inputs, and suggestions will be used to produce the final instrument that will be used for the study. To establish the reliability of the instrument, split half method will be used. Frankfort-Nachmias and Nachmias (2006) explained split half as a method of assessing the reliability of an instrument by dividing the items into two equal parts and correlating the scores in one part with scores in the other. In this study, twenty (20) copies of questionnaire will be administered to twenty (20) respondents in Dengi, Kanam LGA Plateau state who will not be included in the study but who have the same characteristics with the study population. The reason for using split half is to estimate the internal consistency and to exclude some error arising from psychological disposition, fatigue, and health (Gall, Borg, 2007). The reliability of the instrument for section B will be established through the use of Cronbach Alpha technique, since the items of the instrument are polychotomously scored (Nwogu, 2006). The results of the reliability estimates will be shown in the appropriate Appendix. Cronbach Alpha K-R-20 according to Mohsen and Reg (2011) can be used to determine internal consistencies of the instrument. Reliability correlation coefficient of 0.70 and above will be accepted for the instrument. Ellen (2011) explained that if the correlation coefficient attains 0.70 and above, the instrument should be considered reliable for the study. But if the correlation coefficient obtained is not up to 0.70 and above, the instrument will be revalidated to make it reliable for the study. In order to gain access to the respondents, a letter of introduction will be obtained from the Head, Department of health and Physical Education, University of Nigeria, Nsukka, and will be presented to the respective school principals who will introduce the research to the heads of department, and class teachers (see Appendix). The researcher will administer copies of the questionnaire to the respondents with the help of two assistants. The two assistants will be briefed on the modalities of completing the instrument (DPCANQ). The research and the two assistants will supervise the respondents to ensure that there will be no exchange of ideas during the process of completing the questionnaire. The completed copes of the questionnaire will be collected on the spot to ensure high return rate. Research question 1 and 2 will be answered using frequencies and percentages while research 3-11 will be answered using mean and standard deviation. The entire hypothesis (1-8) will be analyzed using ANOVA statistic at .05 level of significance

Anthrax :: essays research papers

1. The anthrax bacillus is considered the first "germ" proved to cause human disease. In 2001, Anthrax was deliberately spread through the postal system by sending letters with powder containing anthrax. This caused 22 cases of anthrax infection. 2. Anthrax is a serious disease caused by Bacillus anthracis, a bacterium that forms spores. There are three types of anthrax: skin (cutaneous) lungs (inhalation) digestive (gastrointestinal) 3. Anthrax is not known to spread from one person to another. Humans can become infected with anthrax by handling products from infected animals or by breathing in anthrax spores from infected animal products (like wool, for example). People also can become infected with digestive anthrax by eating undercooked meat from infected animals. 4. The symptoms (warning signs) of anthrax are different depending on the type of the disease: Cutaneous: The first symptom is a small sore that develops into a blister. The blister then develops into a skin ulcer with a black area in the center. Gastrointestinal: The first symptoms are nausea, loss of appetite, bloody diarrhea, and fever, followed by bad stomach pain. Inhalation: The first symptoms of inhalation anthrax are like cold or flu symptoms and can include a sore throat, mild fever and muscle aches. Later symptoms include cough, chest discomfort, shortness of breath, tiredness and muscle aches. 5. Antibiotics are used to treat all three types of anthrax. Early identification and treatment are important. Treatment is usually a 60-day course of antibiotics. Success depends on the type of anthrax and how soon treatment begins. 6. Vaccination. There is a vaccine to prevent anthrax, but it is not yet available for the general public. 7. Those who are often exposed to animals, or those in developing countries, especially those without strong veterinary public health programs. 8. The bacterium's destructive properties are due largely to toxins, which consist of three proteins: protective antigen, edema factor, and lethal factor. Protective antigen (PA) binds to select cells of an infected person or animal and forms a channel that permits edema factor and lethal factor to enter those cells. Edema factor (EF), once inside the cell, causes fluid to accumulate at the site of infection. EF can contribute to a fatal buildup of fluid in the cavity surrounding the lungs. It also can inhibit some of the body's immune functions.

Children’s development of emotional self-regulation Essay

The early years of a child’s life are the most important in terms of their general well-being, their emotional and social development, and their physical, intellectual and emotional growth. Children develop at different paces and a very high proportion of what they learn takes place in the first five to seven years of life. What happens in the home is extremely important to development in early childhood. There is also a growing perception that this is a time when children are most open to high quality care and learning experiences. Children’s development of emotional self-regulation is important for many aspects of their health and wellbeing, including their ability to tolerate frustration, curbs aggressive impulses, delay gratification, and express emotions in socially acceptable ways. Children who are able to regulate their own emotions are better able to interact with their peers, whereas poor emotion regulation in preschool-aged children has been related to higher levels of externalizing behaviors. Children’s deficits in the ability to self-regulate their own behavior have been linked to rapid weight gain and obesity in middle childhood. Children who are good in self-regulation will have better relationships with their teachers and classmates. Read more:Â  Personal factors that affect child development essay You will also do better academically. You will have the motivation to enjoy school and the people around you. You will be confident in the way you talk and act in front of people. This skill will help you to grow up with the proper manners and attitude towards other people. You will gain more knowledge in interaction and conversing with different types of people. Parents play an important role in children’s development of self-regulation of emotions in the early years. At birth, infants lack control over their emotional arousal. Instead, infants’ emotional arousal is regulated by their own biological needs and how parents respond to those needs. Parents comfort infants when they express negative emotions as well as arouse positive emotions in their infants through play and other stimulating interactions. For example, if a one-month-old baby experiences an aversive stimulus, the infant’s crying signals to the parent that he or she is upset. Parents’ actions such as calming or soothing the infant serve to regulate the child’s emotions. Therefore, young infants rely heavily on their parents to regulate their emotions. As children age, they require less assistance in regulating emotions. For example, a four-year-old might self-sooth in response to an aversive stimulus instead of immediately crying. Throughout the first year of life, infants gradually increase their ability to control their own emotional states and they begin to self-regulate emotions before the second half-year of life. Individual differences in children’s abilities to regulate their emotions are apparent by this time, and whether they intend to or not, parents substantially influence these individual differences. Parents can help their infants and toddlers regulate their emotions by learning to say no from the very start! No means no. If there is one thing I cannot stand and I see very often is when a parent cannot say no to their children. Stop being so damn afraid of your child, let them throw a tantrum, they’ll get over it! I cannot express that enough. Discipline is the system in which parents guide and teach their children. This word is often confused with the term punishment. The purpose of discipline is to teach children the difference between right and wrong, to incorporate a sense of limits and appropriate behavior. Teaching discipline is a challenging task for parents and caregivers and not one that is taught overnight. It takes many years for most children to be able to achieve self-control. Also, as children grow and develop, so do the types of things that they must be taught. The method of discipline must grow and change with the child. Caregivers need to be flexible because of changes in children and their environment as children mature and grow. Time out is a very effective form of mild punishment. Time-out literally means time-out from all the things the child enjoys, for example – rewards, parent’s attention, reinforcement, toys, music and all other interesting activities. Time-out has two major goals. The immediate goal is the stop the problem behavior as quickly as possible and the long-term goal is to help the child learn self-discipline. The good thing about time-out is that it does not emotionally harm the child and it models calm and good behavior on the parent’s part. Time-out works best with children age two to twelve. This method should be considered with certain types of behaviors including impulsive, aggressive, hostile and emotional behaviors. Time-out does not work to get a child to begin doing a behavior, but it is very effective in stopping bad behaviors. Time-out can be used initially with one or two target behaviors and once the parent and child get used to the technique it can be expanded to more problem behaviors. The child should be placed in time-out for one minute for every year of life. For example a 5 year old would sit in time out for five minutes. You should use a small portable timer to remind the child when the time-out is over. Once the timer rings parents and or caregivers should ask the child why they went to time-out. Once they produce the answer the parent drops the issue and goes about their daily activities as usual. Time-out is not designed to make a child feel bad or humiliated it should be used to instill that when they act a certain way they will be disciplined for it and take those minutes in time-out to help them realize for themselves that what they did was wrong. Scolding is another common form of mild punishment that should be used by parents. When scolding a child for bad behavior it is important to move close to the child, maintaining good eye contact, being stern, and expressing your feelings while naming the undesirable behavior. It is important to be brief and calm, showing disapproval for the behavior not the child. Another type of mild punishment is natural consequences. Some examples include not wearing an appropriate outfit to school and getting sent to the principal’s office or being careless in not packing a lunch and being hungry at lunchtime. Logical consequences occur for behaviors that do not have natural consequences. Some examples include not eating all of your dinner and then not having any dessert; or riding the bicycle in the street and having the bike taken away for three days or in the case of my 8 years old daughter, rushing through her homework just so she can play on her iPad or watch TV. I, in return take away her iPad and TV privilege’s until she realizes that taking her time and doing her homework without rushing through it, rewards her with her favorite activities such as playing on her iPad, watching TV, etc. Self-regulation in early development is influenced by a child’s relationships with the important adults in her life. As parents and caregivers, providing the experiences, support, and encouragement that help very young children learn to self-regulate is a critical element in quality care.

Project on chemistry: study of digestion of starch by salivary amylase

Objectives of the Project ReportThe main objective of this chemistry project report is â€Å"To Study the digestion of starch by salivary amylase and effect of temperature and pH on it† and To study digestion of starch by saliva. To study the effect of temperature on the digestion of starch by saliva. To study the effect of pH on the salivary digestion of starch.IntroductionEvery health book insists on the chewing of food. The act of chewing stimulates the excretion of saliva. Saliva mixes up with the food and helps its digestion. That is, the enzyme ptyalin or amylase present in human saliva hydrolyse the big molecules of food into many molecules. For example starch into mono-saccharides maltose and glucose; proteins into amino acids and fats into fatty acids and glycerol. Thus saliva not only helps in digestion of food but convert it into energy generating substances.Further, enzymes and their activity are very sensitive to temperature and pH. Even a slight variation in thes e two factors, can disrupt the action of enzymes. In other words, digestion of food by salivary amylase is also effected by pH and temperature and can be verified experimentally. For example, hydrolysis of starch can be verified by testing it with iodine solution. Starch forms blue coloured complex with iodine. If no starch is present in a system it will not give blue colour with iodine.Requirements for Chemistry Project ReportThe requirements for experiment of Chemistry Project Report are as under:Test tubes Test tube stand One dropper Beaker Stop watch Starch and Iodine solution Thermometer Dil. HCl and Dil NaOH solution.Chemistry Experiment ProcedureProcedure for Chemistry Experiment is:1) Collection of Saliva – Rinse mouth throughly with cold water and ensure that it does not contain any food particles. Now take about 20ml of lupe warm water in the mouth and gangle for about three minutes so that saliva mixes up well with it. Spit this into a beaker. Filter, if there is a ny suspended impurity clear filtrate is saliva solution and contains enzyme ptyalin.2) Preparation of starch solution – Take about 0.5g of starch in a 100ml beaker and add enough water to make a paste. Dilute the paste by adding 50ml water and boil for about 5 min.3) Digestion of starch- (a) take 5ml of the starch solution in a test tube. Add 2 ml of saliva solution into it. Mix the solutions well by shaking the tube carefully and start a step watch. (b) After one minute take out two drops of the mixture solution from the test tube with the help of a dropper and transfer it into another test tube containing about one ml of 1% iodine solution. Note the colour produced, if any. (c) Repeat this test after every one minute taking two drops of the mixture solution and fresh 1% iodine solution continue until the test shows no blue colour. Record the time and blue colour intensity.Time Passed after mixing |  Colour Intensity1 Min. –  Deep Blue 2 Min. –  Blue 3 Mi n. –  Light Blue 4 Min. –  No BlueAbsence of blue colour on addition to iodine solution means absence of starch in the mixture solution. That is whole of the starch has got digested or hydrolysed.Procedure: Effect of temperature on the digestion of starch by saliva. Take  three test tubes and label these 1, 2, 3.Take 5ml of the starch solution, 2ml of the saliva solution and 5 ml of water in each test tube. Place test tube No. 1 in water at room temperature, test tube No.2 in a beaker containing water at 500 C and test tube No.3 in boiling water. After 5 minutes, observe the colour change on mixing two drops of the mixture of every tube with one ml of 1% iodine solution. Note the intensity of blue coloured form.ConclusionStarch get hydrolysed by saliva amylase.Procedure: To study the effect of pH on the salivary digestion of starch Take three test tubes and label these 1, 2, 3.Add 5ml of the starch solution, 2ml of the saliva solution in each test tube. Now add 2 ml of water inn test tube No. 1, 2 ml of dil HCl in test tube No. 2 and 2ml of dil NaOH solution in test tube No. 3 and shake carefully. Keep the three test tubes in water at room temperature for about 10 minutes. Add two drops of the solution of each test tube with 1% iodine solution and observe the colour change.ConclusionTemperature effects the digestion of starch by saliva with increase in temp salivary analyse get inactivated and process of digestion do not take place.

Hurricanes Essays (607 words) - Vortices, Tropical Cyclone, Eye

Hurricanes Essays (607 words) - Vortices, Tropical Cyclone, Eye Hurricanes Hurricanes get their start over the warm tropical waters of the North Atlantic Ocean near the equator. Most hurricanes appear in late summer or early fall, when sea temperatures are at their highest. The warm waters heats the air above it, and the updrafts of warm, moist air begin to rise. Day after day the fluffy cumuli form atop the updrafts. But the cloud tops rarely rise higher than about 6,000 feet. At that height in the tropics, there is usually a layer of warm, dry air that acts like an invisible ceiling or lid. Once in a while, something happens in the upper air that destroys this lid. Scientist don not know how this happens. But when it does, it's the first step in the birth of a hurricane. With the lid off, the warm, moist air rises higher and higher. Heat energy, released as the water vapor in the air condenses. As it condenses it drives the upper drafts to heights of 50,000 to 60,000 feet. The cumuli become towering thunderheads. From outside the storm area, air moves in over the sea surface to replace the air soaring upwards in the thunderheads. The air begins swirling around the storm center, for the same reason that the air swirls around a tornado center. As this air swirls in over the sea surface, it soaks up more and more water vapour. At the storm center, this new supply of water vapor gets pulled into the thunderhead updrafts, releasing still more energy as the water vapor condenses. This makes the updrafts rise faster, pulling in even larger amounts of air and water vapor from the storm's edges. And as the updrafts speed up, air swirls faster and faster around the storm center. The storm clouds, moving with the swirling air, form a coil. In a few days the hurricane will have grown greatly in size and power. The swirling shape of the winds of the hurricane is shaped like a dough-nut. At the center of this giant dough-nut is a cloudless, hole usually having a radius of 10 miles. Through it, the blue waters of the ocean can be seen. The hurrica ne's wind speed near the center of the hurricane ranges from 75 miles to 150 miles per hour. The winds of a forming hurricane tend to pull away from the center as the wind speed increases. When the winds move fast enough, the hole developes. This hole is the mark of a full-fledge hurricane. The hole in the center of the hurricane is called the eye of the hurricane. Within the eye, all is calm and peaceful. But in the cloud wall surrounding the eye, things are very different. Although hurricane winds do not blow as fast as tornado winds, a hurricane is far more destructive. That's because tornado winds cover only a small area, usually less than a mile across. A hurricane's winds may cover an area 60 miles wide out from the center of the eye. Another reason is tornadoes rarely last as long as an hour, or travel more than 100 miles. However , a hurricane may rage for a week or more (example: Hurricane Dorthy) In that time, it may travel tens of thousands of miles over the sea and land. At sea, hurricane winds whip up giant waves up to 20 feet high. Such waves can tear freighters and other oceangoing ships in half. Over land, hurricane winds can uproot trees, blow down telephone lines and power lines, and tear chimneys off rooftops. The air is filled with deadly flying fragments of brick, wood, and glass.