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2011-NMMU-Research-Report - Research Management - Nelson ...

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Profiled below are five postdoctoral fellows:<br />

Dr Craig Tambling<br />

Dr Craig Tambling is a NRF funded postdoctoral fellow currently<br />

working in the Centre for African Conservation Ecology (ACE), based<br />

in the Zoology Department. He is predominantly based in the Addo<br />

Elephant National Park, continuing long-term predator-prey research<br />

in collaboration with the SANParks. Dr Tambling’s past research<br />

has revealed that buffalo have altered their behaviour to increase<br />

their ability to defend juveniles within herds. The Addo buffalo have<br />

amalgamated into larger breeding herds and now use open landscapes<br />

during dangerous times when lions are known to be most active. As a<br />

consequence lion predation on buffalo has declined significantly since<br />

the lion reintroduction in 2003.<br />

Dr Tambling’s current research projects include investigating the<br />

impact that large predators have on prey species; and models for<br />

large carnivore reintroductions into small-medium sized reserves.<br />

Dr Tambling is also involved in collaborative research with the<br />

Endangered Wildlife Trust (EWT) cheetah metapopulation project<br />

and with researchers from North Carolina State University (USA),<br />

and Queens University in Belfast (Nothern Ireland) investigating<br />

cheetah foraging ecology. He also collaborates with researchers<br />

from George Mason University in Virginia (USA) and Lincoln Park<br />

Zoo in Chicago (USA), investigating the temporal responses of prey<br />

species to predator presence.<br />

Dr Surekha Krishnan<br />

Dr Surekha Krishnan with Ms Esther Akinlabi.<br />

53<br />

During her tenure, Dr Surekha Krishnan was mainly involved in two<br />

projects related to friction stir processing (FSP) / welding (FSW).<br />

The first focused on investigating the cryogenic treatment to<br />

improve wear properties of AISA H13 tool steel. This study aimed<br />

at comparing the wear behaviour of AISI H13 tool steel and Bohler<br />

K390 P/M steel (9% v) before and after cryogenic treatment. The<br />

second project focused on the improvement of corrosion resistance<br />

of pure copper for intrauterine devices.<br />

Copper-containing IUDs are increasingly being used as an effective<br />

contraceptive. However, there appears to be several problems with<br />

coarse grained copper, such as the side effects from burst release of<br />

cupric ion during the first one to two months of implantation, low<br />

transfer efficiency of cupric ion from copper element and corrosion<br />

breakage. Despite great efforts to solve these problems, the burst<br />

release of cupric ion in the uterine environment is still an issue for<br />

immediate attention. This project aimed to produce fine grained<br />

copper with better bio-compatibility. Besides her involvement in the<br />

above projects, Dr Krishnan also gave expertise technical guidance<br />

to Doctoral student, Esther Akinlabi (who graduated in April <strong>2011</strong>)<br />

and Masters student, Victor Ngea. She also published two articles<br />

on FSW.

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