The cause and effect of migration free essay sample

The cause and effect of migration Every year, large numbers of people migrate from one country to another for various reasons. Many of them are willing to abandon their careers and homes in own countries and start a totally different life in a new place. However, the great flow of immigration has brought some effects to both the sending country and host country.This essay will briefly review the cause of human migration and some effects on the different types of countries. There are many reasons to explain the migration phenomenon. Taken together, most of them can be divided into two partspull factors and push factors.ï ¼Ë†from Natasha C. Parkins) The pull factors are aspects that attract people to a new country.For example, the change of concepts makes people realize the real importance of life.Many people shift their sight from making money to getting a healthy and free life. We will write a custom essay sample on The cause and effect of migration or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Most wealthy people from some developing countries start to seek for a new society with fresh air, beautiful scenery and peaceful atmosphere. That is to say, excellent surroundings, as a pull factor, plays a vital role in the reason for migration. In addition,well-paid job opportunities are also attracting those people who are eager for creating a fulfilling life to their families. The push factors are conditions that drive people away from their countries. For instance, some countries focus too much on the development of industry and economic which made the environment become seriously polluted. This factor has pushed the native who has the ability to emigrant to a clean country for the consideration of health. The reasons of migration can be understood by all of us. However, it has caused some effects to both sending country and host country. The results of immigration can be divided as following. Immigration depletes a country`s intellectual capital and energy. As we know, most immigrants are the well-educated group in their countries. However, they bring their knowledge and wealth to another country which exactly undermines their own countries` benefit. For example, some intellectual scientists in China migrated to the United States for further study. As their new  identities-American citizens, they got the Nobel Prize for the US after hard working. As a matter of fact, the outflow of talent made China have nobody to win the Nobel Prize in the science field even though some foreign citizens of Chinese origin had won it. The migration has also brought large amounts of influence to the host country. Firstly, the excessive labor force made the competition of jobs become more fierce. Secondly,the security of the host country faces an acid test because of the superabundant immigration. Last but not the least, the burden of government in the host country has increased rapidly. To sum up, the effects of migration mainly include pull factors and push factors. The major pull factors are the opportunities of seeking jobs and the wonderful pursuits of human beings who want to lead a fulfilling life. The primary push factors are the poor conditions of the environment and some limited policies of their own countries. Furthermore, migration also brings some effects to the both types of countries. It made the sending country lack labor force and intellectual talents and it also made the host country rise in population which even threatens the national security.

DEET Chemistry (Dimethyltoluamide)

DEET Chemistry (Dimethyltoluamide) If you live in an area with biting insects you have almost certainly encountered an insect repellent that uses DEET as its active ingredient. The chemical formula for DEET is N,N-diethyl-3-methyl-benzamide (N,N-dimethyl-m-toluamide). DEET was patented by the U.S. Army in 1946 for use in areas with heavy biting insect infestation. It is a broad-spectrum repellent that is effective against mosquitoes, flies, fleas, chiggers, and ticks. DEET has a good safety record and is less toxic to birds and other mammals than many other insect repellents, but all DEET products should be handled with care. DEET Safety DEET is absorbed through the skin, so it is important to use as low a concentration as is effective (10% or less for children) and as small an amount as is necessary. Up to a certain point, protection against insects increases with higher DEET concentration, but even low concentrations will protect against most bites. Some people experience irritation or an allergic reaction to DEET-containing products. DEET is toxic and potentially fatal if swallowed, so care should be taken to avoid applying repellent to hands or face or anything a child might put in the mouth. DEET should not be applied to areas with cuts or sores or around the eyes, since permanent eye damage can result from contact. High doses or long-term exposure to DEET have been associated with neurological damage. DEET can damage some plastics and synthetic fabrics, such as nylon and acetate, so be careful not to damage clothing or camping equipment. How DEET Works Biting insects use chemical, visual, and thermal cues to locate hosts. DEET is believed to work by blocking the chemical receptors for carbon dioxide and lactic acid, two of the substances released by our bodies that serve as attractants. Although DEET helps keep insects from locating people, there is probably more involved in DEETs effectiveness, since mosquitoes wont bite DEET-treated skin. However, skin only a few centimeters away from DEET is susceptible to bites. Recommendations for Using DEET Despite its hazards, DEET remains one of the safest and most effective insect repellents available. Here are some tips for using DEET safely: Reduce your need for repellent. Avoid behaviors that will attract biting insects (e.g., avoid strenuous exercise or eating lots of high sodium or potassium foods prior to going outdoors, which increase carbon dioxide release).Avoid applying chemicals that attract biting insects (e.g., floral-scented perfumes, scented sunscreens, dryer-sheet-scented clothes).Where possible, apply DEET-containing repellent to clothes rather than to skin.Apply DEET in a well-ventilated area.Avoid applying DEET to hands, the face, or any injured or sensitive skin.Avoid behaviors that will lessen the duration of DEET effectiveness (e.g., perspiration, rain, mixing with sunscreens).When you come indoors, wash off DEET-containing products using warm, soapy water.