ScienceDaily: Top Environment News

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• Nature can, selectively, buffer human-caused global warming, say scientists
• Three native aromatics indicated for use in Mediterranean extensive green roofs
• Well-watered citrus tested in cold-acclimating temperatures
• Gardening provides high-to-moderate physical activity for children
• Nitrogen management studied in greenhouse pepper production
• Protocol developed to harvest mouse cell lines for melanoma research

Nature can, selectively, buffer human-caused global warming, say scientists Posted: 02 Feb 2014 08:10 AM PST Can naturally occurring processes selectively buffer the full brunt of global warming caused by greenhouse gas emissions resulting from human activities? Yes, says a group of researchers in a new study.

Three native aromatics indicated for use in Mediterranean extensive green roofs Posted: 31 Jan 2014 10:08 AM PST Scientists investigated native aromatic xyrophytes for use in extensive green roofs in semiarid Mediterranean regions using locally produced grape marc compost as a substrate component. Aromatics Artemisia absinthium, Helichrysumitalicum, and H. orientale were found suitable for growth in extensive Mediterranean green roofs under limited irrigation and substrate depth (7.5 cm).

Well-watered citrus tested in cold-acclimating temperatures Posted: 31 Jan 2014 10:08 AM PST Researchers studied well-watered citrus to determine changes in water relations during cold acclimation, independent of drought stress. Potted sweet orange and Satsuma mandarin trees were exposed to progressively lower, non-freezing temperatures to promote cold acclimation. Results indicated that water relations of citrus during cold acclimation vary from those known to occur as a result of drought stress. The results could challenge traditional measures of plant water status in irrigation scheduling during winter.

Gardening provides high-to-moderate physical activity for children Posted: 31 Jan 2014 10:08 AM PST The metabolic cost of 10 gardening tasks was measured in children to determine associated exercise intensities. The children performed the tasks while wearing a portable telemetric calorimeter and a heart rate monitor to measure oxygen uptake and heart rate. Results showed digging and raking to be high-intensity, while the other activities were determined to be moderate-intensity. The data can facilitate the development of garden-based exercise programs for children that promote health and physically active lifestyles.

Nitrogen management studied in greenhouse pepper production Posted: 31 Jan 2014 10:08 AM PST Bell pepper was used in a study designed to reduce environmental pollution by increasing nitrogen use efficiency. Nitrogen was applied at four different concentrations to two pepper cultivars. Results showed that nitrogen treatments had no significant negative impacts on fruit physical or chemical quality, including sugar content and acidity. Reduced nitrogen applications did not affect nutritional components of the peppers such as beta-carotene and lycopene content, nor did they reduce antioxidant activity.

Protocol developed to harvest mouse cell lines for melanoma research Posted: 31 Jan 2014 10:06 AM PST Researchers have developed a protocol that permits cells harvested from melanoma tumors in mice to grow readily in cell culture.

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