Get a taste of what’s on offer when you register with Media Club South Africa, with our weekly photo essay featuring the best photography from the site’s free image library.The image library is a free public service provided by Brand South Africa – there’s no catch. To view the library, and download photos in high resolution, all you need to do is register with the site. Registration is quick and easy, and gives you immediate access to the photos.But remember you can only republish images if you credit Media Club South Africa, including a hyperlink to the site if they’re published on the web. If you don’t credit the site you are liable for financial damages as set out in the image library terms and conditions of use.Here are our top 10 photos of the week, featuring images from the People section of the library.ABOVE: Dance group competing in a cultural festival in Joubert Park, Johannesburg, Gauteng province.Photo: Chris Kirchhoff Find this photo in the image library at People 2. (Register and log in first.)ABOVE: Samuel Kalule, Peter Kanyerere and an unnamed friend sell their crafts at Camps Bay beach in Cape Town, Western Cape province.Photo: Jeffrey Barbee Find this photo at People 4.ABOVE: On the road past rural homesteads to Qholora Bay in the Eastern Cape province stand golfers Welcome Tolbadi (left, 18 handicap) and Dickson Mboyi (10 handicap) on their way to the Qholora Bay Golf Course for a round of golf.Photo: Rodger BoschFind this photo at People 14.LEFT: Women on their way home from work, at the Noord Street taxi rank in Joburg, Gauteng province.Photo: Chris Kirchhoff Find this photo at People 1. ABOVE: Snompi Mnyoni uses red mud to protect her skin from the sun, in the Central Drankensberg, KwaZulu-Natal province.Photo: Graeme Williams Find this photo at People 14.LEFT: A mother comforts her daughter at the HIV/Aids clinic at Helen Joseph Hospital in Johannesburg, Gauteng province. Photo: Chris Kirchhoff Find this photo at People 1.ABOVE: A motorcyclist on Camps Bay Drive in Cape Town, Western Cape province.Photo: Jeffrey Barbee Find this photo at People 4.ABOVE: Ntsiki Biyela, winemaker at Stellakaya Cellars in Stellenbosch in the Western Cape, among barrels of maturing wine. Biyela is South Africa’s first black female winemaker. See Black, female and making great wine.Photo: Rodger Bosch Find this photo at People 7.ABOVE: People walking their dogs on the Sea Point promenade in Cape Town, Western Cape province.Photo: Jeffrey Barbee Find this photo at People 4.LEFT: A rickshaw driver in Durban, KwaZulu-Natal province.Photo: Graeme Williams Find this photo at People 6.To download these and some 2 000 other free high-resolution photos, register with Media Club South Africa. And don’t forget to read the image library terms and conditions of use. For more information, email us at [email protected]
Brittle stars are included within a whole range of species, which contribute to knowledge in the medically important area of tissue regeneration. All brittle stars regenerate lose limbs, but the rate at which this occurs is highly variable and species-specific. One of the slowest rates of arm regeneration reported so far is that of the Antarctic Ophionotus victoriae. Additionally, O. victoriae also has an unusual delay in the onset of regeneration of about 5 months. Both processes are of interest for the areas of regeneration biology and adaptation to cold environments. One method of understanding the details of regeneration events in brittle stars is to characterise the genes involved. In the largest transcriptome study of any ophiuroid to date, we describe the results of mRNA pyrosequencing from pooled samples of regenerating arms of O. victoriae. The sequencing reads resulted in 18,000 assembled contiguous sequences of which 19% were putatively annotated by blast sequence similarity searching. We focus on the identification of major gene families and pathways with potential relevance to the regenerative processes including the Wnt/β-catenin pathway, Hox genes, the SOX gene family and the TGF beta signalling pathways. These data significantly increase the amount of ophiuroid sequences publicly available and provide candidate transcripts for the further investigation of the unusual regenerative process in this Antarctic ophiuroid.