The toxicity of a chemical refers to its ability to damage an organ system (kidneys, liver), disrupt a biochemical process (e.g., the blood-forming process) or disturb an enzyme system at some site remote from the site of contact. Toxicity is a property of each chemical that is determined by molecular structure. Any substance can be harmful to living things. But, just as there are degrees of being harmful, there are also degrees of being safe. The biological effects (beneficial, indifferent or toxic) of all chemicals are dependent on a number of factors.
For every chemical, there are conditions in which it can cause harm and, conversely, for every chemical, there are conditions in which it does not. A complex relationship exists between a biologically active chemical and the effect it produces that involves consideration of dose (the amount of a substance to which one is exposed), time (how often, and for how long during a specific time, the exposure occurs), the route of exposure (inhalation, ingestion, absorption through skin or eyes), and many other factors such as gender, reproductive status, age, general health and nutrition, lifestyle factors, previous sensitization, genetic disposition, and exposure to other chemicals.
The most important factor is the dose-time relationship. The dose-time relationship forms the basis for distinguishing between two types of toxicity: acute toxicity and chronic toxicity. The acute toxicity of a chemical refers to its ability to inflict systemic damage as a result (in most cases) of a one-time exposure to relative large amounts of the chemical. In most cases, the exposure is sudden and results in an emergency situation.
Chronic toxicity refers to a chemical's ability to inflict systemic damage as a result of repeated exposures, over a prolonged time period, to relatively low levels of the chemical.
Whether they are bought from the chemist or the supermarket, and whether or not they feature the mention “hypoallergenic,” “paraben free” or “dermatologically tested,” many cosmetics contain chemical and allergen substances, preservatives and especially endocrine disruptors, which can have an effect on the hormonal system.
Potentially, these chemical substances are dangerous, particularly for pregnant women and young children. Some doctors are even saying they carry a cancer risk.
So what are the real risks? Why are some pharmaceutical companies still using these substances? insiders investigates.
A natural start to life
Augusta is four months old. For Bozena, her mother, there is no question of her using any products containing these chemicals.
For example, the body lotion she uses is an oil and calcium liniment; a mixture based on olive oil, 100 percent natural.
“Companies tend to add a lot of useless products, like preservatives, containing lots of endocrine disruptors, and I think that not only are they unnecessary, they are harmful to health, for adults and even more so for young babies,” said Bozena.
Bozena is one of the small majority of mothers who actually read the labels on cosmetics.
Drugs have fatal symptoms and effects on humans and this guy tasted a piece of the same. Watch him act like a zombie as the police try to bring him down.
The first step in treating chemical poisoning is preventing its occurrence. Most cases of chemical poisoning are due to such incidents as accidental ingestion of household chemicals by small children. These are highly preventable by taking safety steps, such as childproofing the home and keeping chemicals and medications out of the reach of small children. It is also important to follow all manufacturers' instructions for the safe use of household chemicals, such as pesticides, to avoid accidental chemical poisoning.
The treatment plan for chemical poisoning varies widely, depending on the toxin or toxicant involved, the length of exposure, the severity of symptoms, person's age and medical history, and other factors.
Treatment of a very mild case of chemical poisoning may involve simply observing a person until all potential effects of a chemical have worn off. On the other end of the scale, rigorous treatment in an emergency care and intensive care setting is required for many cases.
In some cases, it may be possible to reverse the effects of a chemical poisoning, such as with the use of antivenom for a snakebite. Another example is the use of the medication naloxone (Narcan) to reverse the respiratory depression effects of a narcotic overdose. Amyl nitrite is a substance that can reverse the effects of cyanide poisoning.
These types of antidotes must be used within a certain time frame before irreversible damage occurs. In addition, many chemicals do not have antidotes to poisoning.
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This video puts the complexity of solar energy and solar cells into plain English.
Dear friend, in this video we are going to discuss about the herbal treatment for shoulder pain. Orthoxil Plus capsules and oil together are the best herbal treatment for shoulder and neck pain problem in men and women.
On the Occasion of World Diabetes Day, Dr. P N Gupta, Sr. Consultant, Nephrology & Transplant Physician, Paras Hospital, Gurgaon is talking about certain facts related to Kidneys and diabetes.
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This video displays the effects of the Atomic Bomb.
Bringing the Axe effect to the stone age.
Canadian inventor John Hutchison is credited with the discovery of a highly-anomalous electromagnetic effect which causes the jellification of metals, spontaneous levitation of common substances, and other effects resulting from what is believed to be a very complex scalar-wave interaction between electromagnetic fields and matter.