Raman spectroscopy of coloured resins used in antiquity: dragon's blood and related substances.

Dragon's blood is a deep red resin which has been used for centuries by many cultures and much prized for it's rarity, depth of colour and alchemical associations. The original source of dragon's blood resin is believed to be Dracaena cinnabari from Socotra in Africa, but since mediaeval times there have been several alternatives from different geographical locations from the Canary Islands to the East Indies. Here, the Raman spectra of dragon's blood resins from Dracaena draco Liliacae trees growing in several different locations bordering the Mediterranean and Middle East are compared with the resins from alternative botanical sources such as Daemonorops draco, Dracaena cinnabari and Eucalyptus terminalis, which all generically come under the description of dragon's blood. Key vibrational spectroscopic marker bands are identified in the Raman spectra of the resins, which are suggested for adoption as a protocol for the identification of the botanical and possible geographical sources of modern dragon's blood resins. The Raman spectra of materials, which are falsely attributed to dragon's blood resin are also shown for comparison and identification purposes. Changes in the Raman spectra of genuine dragon's blood resin specimens arising from simple processing treatment during the preparation of the resins for sale are also identified, which suggests a possible attribution characteristic for unknown samples.

Benefits and barriers associated with participation in food programs in three low-income Ontario communities.

Our objective was to identify the benefits and barriers associated with participation in food programs. We did a content analysis of focus groups with parents (n=21), teachers (n=10), project staff (n=21), and children (n=17) in three low-income Ontario communities. The key benefits identified by the three adult groups were hunger alleviation and social contact opportunities for both parents and children. Parents also benefited from volunteering with and/or participating in food programs because neighbourhood support networks developed. Teachers reported that children who attended breakfast programs became more attentive in school. The food programs also provided an opportunity for nutrition education. Offering food as part of all community programs (not just those designed to increase food availability) encouraged participation and increased attendance. Children thought that attending food programs kept them healthy, and helped them work harder in school. Parents' pride was the main barrier to participation in programs; however, parents who were actively involved in program delivery did not feel stigmatized accepting food. To encourage participation, nutrition professionals should collaborate with local residents to develop and implement community-based food programs.