| organic tracers from asphalt in propolis produced by urban honey bees, apis mellifera linn. | propolis is a gummy material produced by honey bees to protect their hives and currently has drawn the attention of researchers due to its broad clinical use. it has been reported, based only on observations, that honey bees also collect other non-vegetation substances such as paint or asphalt/tar to make propolis. therefore, propolis samples were collected from bee hives in riyadh and al-bahah, a natural area, saudi arabia to determine their compositional characteristics and possible sources of ... | 2015 | 26075382 |