Physical contact with arsenic can cause, initially, the skin to thicken and, with prolonged contact, blood flow to the heart to become decreased.

By far the most common form of the condition is caused by iron deficiency. Any scarring will improve with time. However, if left untreated, the infection can spread and cause blood poisoning, which is fatal in one in 20 cases.
Do anti-coagulants have any side-effects? Species 'vital' to economics "We must guard against giving developing nations the impression that the developed world expects them to carry our share of the burden," he said.
If iron depletion is very severe blood transfusions may be necessary.
There are several widely-used drugs which stop clots forming.
Some medicines will also make it worse, including some contraceptive pills and steroids.
However, these treatments take up to an hour to reach the bloodstream, and true anaphylactic shock requires immediate treatment with adrenaline injection.
The process takes half an hour.
Acne can be extremely distressing and it is important to seek help if you are anxious or depressed about it. What causes Alzheimer's?
They can also suffer damage to the oesophagus.
Eventually the stiffness and deformity become irreversible. This produces severe food-poisoning type symptoms, leading to fever and blood poisoning. "Contributing factors were the long-term trend toward warmer temperatures as well as a moderate El Nino in the Pacific," said Jay Lawrimore of Noaa's National Climatic Data Center.
Around five per cent of women and one per cent of men aged 25-40 continue to have acne after adolescence.
The common APTT ratio is between 1. If these symptoms occur, it may be too late to stop drinking.
Combined treatment with warfarin and aspirin has been recommend in the UK for prevention of heart attacks in people at risk though this may increase the risk of a  haemorrhage.
The condition also affects one in six women over the age of 85.
Stopping smoking a day or two before operation is of little help.
BBC Environment Correspondent Alex Kirby looks at the current state of play. Peripheral vision is retained.