Essays on DDE

Introduction

Malaria is major life threatening disease, transmitted through mosquitoes and caused by parasites. Plasmodium virus causes malaria in humans. A recent study and WHO Statistics revealed that around 625,000 individuals died because of Malaria in the year 2012. Malaria has affected more than 200 million people in over 75 countries in the past 50 years. The sub-Saharan Africa covering to about 50% of malarial cases alone. DDT (dichlorodiphenyltrichloroethane) was introduced in the year 1874. The insecticidal properties of DDT was discovered in the year 1935 and has been used worldwide ever since. Many early studies had revealed the ...

Introduction

Teratogen is broadly defined as an environmental agent capable of causing abnormal prenatal variation in form or function. In other words, it can be any environmental factor that can produce a permanent abnormality in structure or function of an embryo or fetus or restriction of growth of an infant (Gilbert-Barness, 2010). In prenatal life, exposure to teratogens may even lead to death of the embryo or fetus. It is estimated that approximately 15% of all congenital structural abnormalities observed in a child are due to exposure to some kind of teratogens during the prenatal life (Brent, 2001). A larger number of ...

Windows objects and the file system:

Windows objects are objects that can be identified, accessed and classified by a unique name. A file system is a data store type that is normally used to store, update and retrieve a given set of files. Computers use specific types of file systems to organize and store data on various media, such as hard drive, CDs, DVDs and flash drives. An example is NTFS used by windows 7. A file system can therefore be viewed as an index to the physical location of every bit of information on a media.

Sessions:

A session is a conversation or a dialogue between communicating devices, or between a ...

1.0 Introduction Dichlorodiphenyltrichloroethane (DDT) was first synthesized in 1874 and its insecticidal properties were discovered around 1939. It belongs to a group of chemicals referred to as organochlorine or chlorinated hydrocarbon. The chemical has since been used as an insecticide for a long time. It is crystalline, colorless, has a weak odor and, like other organochlorines, it’s hydrophobic with good solubility in most organic solvents, fats, and oils (lipophilic). The bio-magnification of DDT is attributed to its lipophilic property. It was widely used successfully used in the control typhus and malaria during the second half of the Second World War. ...