Genes 2. Chromosomes 3. Meiosis 4. Inheritance 5. Genetic Modification 4: Ecology 1. Energy Flow 3. Carbon Cycling 4. Climate Change 5: Evolution 1. Evolution Evidence 2. Natural Selection 3. Classification 4. Cladistics 6: Human Physiology 1. Digestion 2. The Blood System 3. Disease Defences 4.
Gas Exchange 5. Homeostasis Higher Level 7: Nucleic Acids 1. However, even the best medical care does not prevent death in every case. For those with very severe illness, supportive care in an intensive care unit may be needed. For persons with necrotizing fasciitis, surgery often is needed to remove damaged tissue.
Related Stories. But now scientists are paying more attention to 'horizontal Genetic analysis of other Bacillus strains has shown genes that contribute to antibiotic resistance In a new study, researchers have shown how new genes that produce resistance can arise from In almost all cases where an origin could be determined, the gene And researchers Spiders' Web Secrets Unraveled.
Using a novel technique, researchers have been able What Makes Us Human? Stem cell researchers have now found a previously overlooked The researchers hypothesize that a lower channel density may have A research team has established their global geographic distribution using DNA data and a probabilistic model.
Researchers have shown that it is possible to identify individual proteins with single-amino acid Owners may be underestimating their dog's Some major examples of crops with these so-called 'transgenes' include Reducing the Cost of Plant Improvement. Print Email Share. Most Popular Stories. This upsurge of infectious disease is a problem we have unwittingly created for ourselves.
The rise of rapid, frequent, and relatively cheap international travel allows diseases to leap from continent to continent. Inadequate sanitation and lack of clean drinking water are another factor. A third is the "antibiotic paradox" -- the overuse of the "miracle drugs" to the point that they lose their potency.
Whenever antibiotics wage war on microorganisms, a few of the enemy are able to survive the drug. Because microbes are always mutating, some random mutation eventually will protect against the drug. Antibiotics used only when needed and as directed usually overwhelm the bugs. Too much antibiotic use selects for more resistant mutants. When patients cut short the full course of drugs, the resistant strains have a chance to multiply and spread.
In some countries, such as the United States, patients expect and demand antibiotics from doctors, even in situations where they are inappropriate or ineffective. Our immune systems will cure many minor bacterial infections on their own, if given the chance, and antibiotics have no effect on viral infections at all.
Every time antibiotics are used unnecessarily, they add to the selective pressure we are putting on microbes to evolve resistance.
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