News tagged with leave

Warning: Your open-plan office can make you ill

Don't blame other commuters if you catch a cold this winter: blame the people who designed your office. According to a study published in the current issue of Ergonomics, workplace layout has a surprising effect on rates ...

Feb 25, 2014
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Gap between maternity policies revealed

Mothers who exclusively breastfeed their child spend 6.6 hours a week longer milk feeding than mothers who partially breastfeed or formula feed, which has important implications for health policies and programs, ...

Aug 19, 2013
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Report: Family and medical leave law working

(AP)—The Labor Department says just 16 percent of eligible workers took time off last year under the Family and Medical Leave Act to recover from an illness, care for a new child or tend to a sick relative.

Feb 05, 2013
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Sex differences in return to work for cancer survivors

(HealthDay)—Significant differences have been identified in the return-to-work (RTW) process for male and female cancer survivors, according to research published online Jan. 28 in the Journal of Clinical On ...

Feb 01, 2013
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Spine education seems ineffective in pain prevention

(HealthDay)—Educational interventions, mainly focused on a biomechanical/biomedical model, do not seem to be effective in preventing low back pain, according to a review published in the December issue ...

Dec 10, 2012
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Leaf

In botany, a leaf is an above-ground plant organ specialized for photosynthesis. For this purpose, a leaf is typically flat (laminar) and thin. There is continued debate about whether the flatness of leaves evolved to expose the chloroplasts to more light or to increase the absorption of carbon dioxide. In either case, the adaption was made at the expense of water loss. In the Devonian period, when carbon dioxide concentration was at several times its present value, plants did not have leaves or flat stems. Many bryophytes have flat, photosynthetic organs, but these are not true leaves. Neither are the microphylls of lycophytes. The leaves of ferns, gymnosperms, and angiosperms are variously referred to as macrophyll, megaphylls, or euphylls.

Leaves are also the sites in most plants where transpiration and guttation take place. Leaves can store food and water, and are modified in some plants for other purposes. The comparable structures of ferns are correctly referred to as fronds. Furthermore, leaves are prominent in the human diet as leaf vegetables.

This text uses material from Wikipedia licensed under CC BY-SA