DDT stands for dichloro-diphenyl-trichloroethane. The first kind of synthetic/artificial insecticides came into use in the 1940s. The earlier usage of DDT include: a) Killing of malarial vectors, b) Combatting Typhus and other insect borne human diseases, c) As a pest control in crops d) as a pest control in garden, live stock production and even at homes.
The negative impact of DDT could be felt for the first time when the pests that were earlier killed by use of DDT have now become pesticides resistant. In the 1950s in USA, the regulatory measures were adopted to reduce the usage of DDTs as its effects as a pesticides were no more long significant and also it was creating detrimental physical and psychological impacts on the human and environment.
It was in 1972 that the U.S. Environmental Protection Agency cancelled the order for banning the usage of DDT based on the adverse impact it produced on the environment, human and other life forms. Since then continuous studies are being conducted to analyse the impact of DDTs. In some later years it was established that DDT is the cause of producing tumors in liver.
Some of the common negative impacts produced by DDT as per the U.S. Department of Agriculture :
a) The non destructive nature – DDT can not be destroyed and thus it remains persistent in the atmosphere
b) It attacks the tissues of living organisms especially the animals and humans ( fatty tissue)
c) It can penetrate the atmosphere to deeper extent.
Now as per the current stuation, The use of DDT is controlled and other alternatives of pest control organisms is being deduced. As per the treaty of Stockholm Convention on POPs (Persistent organic pollutants) , usage of DDT for malarial control is justified but it puts a restrictive use of DDT as pesticides in other areas.
Answer:
A tear in right rib muscles has caused the muscles to spasm it would prevent inspiration.
Reason:
As it is cleared that during inspiration, the intercostal muscles contract, the ribs move upward. the diaphragm flattens and move downward. As a result the chest cavity become open and air move into it. However if the muscles of rib tears then rib will not raise. As a result there will be difficulty in inspiration/
Answer:
The cell membrane acts as a barrier that protects the cell from the external environment and it regulates the movement of the particles or substances in and out of the cell.
Answer:
all functions
Explanation:
To survive, unicellular cells must carry out all functions.
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An appropriate nursing task in the situation would be
nutritional intervention to help the patient adopt healthy eating practices. A
proper nutritional balance is vital during cancer care. A Nurse should offer
nutritional therapy to help maintain the strength of the patient and alleviate
the side effects of chemotherapy. Such nutritional therapy is essential to
maximize quality of life, preserve body mass, and prevent nutritional deficiencies.
