ScienceDaily: Top Environment News |
- Scientists show how antibiotics enable pathogenic gut infections
- Increased greenhouse gases and aerosols have similar effects on rainfall
- Spread of crop pests threatens global food security as Earth warms
- Drug-Resistant TB's Surprising Family Tree
- Mycobacterium tuberculosis: Our African follower for over 70,000 years
| Scientists show how antibiotics enable pathogenic gut infections Posted: 01 Sep 2013 12:41 PM PDT A new study could help pinpoint ways to counter the effects of the antibiotics-driven depletion of friendly, gut-dwelling bacteria. In the first 24 hours after administration of oral antibiotics, a spike in carbohydrate availability takes place in the gut, the study says. This transient nutrient surplus, combined with the reduction of friendly gut-dwelling bacteria due to antibiotics, permits at least two potentially deadly pathogens to get a toehold in that otherwise more forbidding environment.  |
| Increased greenhouse gases and aerosols have similar effects on rainfall Posted: 01 Sep 2013 12:40 PM PDT Although greenhouse gases and aerosols have very distinct properties, their effects on spatial patterns of rainfall change are surprisingly similar, according to new research.  |
| Spread of crop pests threatens global food security as Earth warms Posted: 01 Sep 2013 12:40 PM PDT A new study has revealed that global warming is resulting in the spread of crop pests towards the North and South Poles at a rate of nearly 3 km a year. The study shows a strong relationship between increased global temperatures over the past 50 years and expansion in the range of crop pests.  |
| Drug-Resistant TB's Surprising Family Tree Posted: 01 Sep 2013 12:40 PM PDT A new method of analyzing whole genome sequences of TB, applied to a massive set of strains of the bacteria collected from clinics around the world, has revealed 39 new genes associated with elevated drug resistance.  |
| Mycobacterium tuberculosis: Our African follower for over 70,000 years Posted: 01 Sep 2013 12:40 PM PDT One of the deadliest infectious diseases of humankind emerged in Africa 70,000 years ago, a new genetic analysis of 259 Tuberculosis bacterial strains has shown. According to the study, TB bacteria migrated out of Africa hand-in-hand with the first anatomically modern humans. Today's deadly features of TB may be a result of the common migratory path and changes in human live-styles. These evolutionary findings may impact the future developments of new drugs and vaccines.  |
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