Search This website

Loading...

06/09/2009

American scientists have for the first time shown how exposure to diesel fumes causes cancer

American scientists have for the first time shown how exposure to diesel fumes causes cancer.

Qinghua Sun, an assistant professor of Environmental Health Sciences at Ohio State University, says that diesel exhaust has the ability to induce the growth of new blood vessels that serve as a food supply for solid tumours.

The researchers found that in both healthy and diseased animals.

According to them, more new blood vessels sprouted in mice exposed to diesel exhaust than did in mice exposed to clean, filtered air.

They say that this finding indicates that previous illness is not required to make humans susceptible to the damaging effects of the diesel exhaust.

The researchers say that inhaled diesel particles are very tiny in size, which is why they can penetrate the human circulatory system, organs, and tissues.

This suggests that diesel fumes can cause damage just about anywhere in the body, they add.

Diesel exhaust exposure levels in the study were designed to mimic the exposure people might experience while living in urban areas and commuting in heavy traffic.

The levels were lower than or similar to those typically experienced by workers who use diesel-powered equipment, who tend to work in mines, on bridges and tunnels, along railroads, at loading docks, on farms and in vehicle maintenance garages, according to the U.S. Department of Labour.

“The message from our study is that exposure to diesel exhaust for just a short time period of two months could give even normal tissue the potential to develop a tumour,” said Qinghua Sun, senior author of the study.

“We need to raise public awareness so people give more thought to how they drive and how they live so they can pursue ways to protect themselves and improve their health. And we still have a lot of work to do to improve diesel engines so they generate fewer particles and exhaust that can be released into the ambient air,” Sun added.

A research article on the study, supported by Health Effects Institute awards and grants from the National Institutes of Health, has been published in the online edition of the journal Toxicology Letters. (ANI)

No comments:

Post a Comment

Note: only a member of this blog may post a comment.

PME Due Date

Master Circular No. 25



Copy of Railway Board’s letter No. 69/H/3/11 dated 06.12.1974



Subject: Implementation of the Recommendations of the Visual Sub-Committee.



6. Periodical re-examination of serving Railway Employees:



6.l. In order to ensure the continued ability of Railway employees in Classes A l, A 2, A 3, B l and B 2 to discharge their duties with safety, they will be required to appear for re-examination at the following stated intervals throughout their service as indicated below:



6.1.1. Classes A l, A 2 and A 3 —At the termination of every period of three years, calculated from the date of appointment until they attain the age of 45 years, and thereafter annually until the conclusion of their service.



Note: (l) The staff in categories A l, A 2 and A 3 should be sent for special medical examination in the interest of safety under the following circumstances unless they have been under the treatment of a Railway Medical Officer.



(a) Having undergone any treatment or operation for eye trouble irrespective of the duration of sickness.



(b) Absence from duty for a period in excess of 90 days.



(2) If any employee in medical category A has been periodically medically examined at any time within one year prior to his attaining the age of 45, his next medical examination should be held one year from the due date of the last medical examination and subsequent medical examination annually thereafter.



If, however, such an employee has been medically examined, at any time earlier, than one year prior to his attaining the age of 45, his next medical examination should be held on the date he attains the age of 45 and subsequent medical examination annually thereafter.




Ammendment: It was ammended in 1993 as below



Age Group PME Due



Age 00-45 every 4yrs



Age 45-55 every 2yrs



Age 55-60 every year
Details:-
As per Rly Bd's Guideline of Medical Exam issued vide LNo. 88/H/5/12 dated 24-01-1993

a) PME would be done at the termination of every period of 4 years from date of appointment / Initial medical Exam till the date of attainment of age of 45 years, every 2 years upto 55 years & there after annual till retirement.
b) Employees who has been periodically examined at any time within 2years prior to his attaining the age of 45years would be examined after 2years from the date of last PME & subsequent PME for every 2years upto 55years age.Of

NRMU 4 you
SMLokhande





6.1.2. Classes B-1 and B-2—On attaining the age of 45 years, and thereafter at the termination of every period of five years.