1. Van Heerden, E, and Litthauer, D. “Selective esterification of fatty acids by lipase.” 12^th Congress of the South African Biochemical Society. January 24-26, 1994. Stellenbosch.
2. Van Heerden, E, and Litthauer, D. “Optimisation of reaction conditions for selective ester formation by lipase using a factorial design.´ 13^th Congress of the South African Biochemical Society. April 3-6, 1995. Bloemfontein.
3. Van Heerden, E, and Litthauer, D. “Purification and Characterisation of the lipase from Aspergillus niger.´ 15^th Congress of the South African Biochemical and Molecular Biology and 2^nd Congress of the Federation of African Societies for Biochemical and Molecular Biology. 30 September–3 October 1998. Potchefstroom.
4. Van Heerden, E, Litthauer, D, and Verger, R. “Surface kinetics of the lipase from Aspergillus niger.´ 15^th Congress of the South African Biochemical and Molecular Biology and 2^nd Congress of the Federation of African Societies for Biochemical and Molecular Biology. 30 September–3 October 1998. Potchefstroom.
5. Bragg, RR, Albertyn, J, and Van Heerden, E (14 October 1999). The use of Metofin for the control of infectious coryza in vaccinated chickens. The Southern African branch of the World’s Poultry Science association, 18^th scientific day, University of Pretoria, South Africa.
6. Paulse, E, Greyling, J, Van Heerden, E, Albertyn, J, and Bragg, RR (24 - 28 January 2000). Serological characterisation of Haemophilus paragallinarum from South America, BioY2K Combined Millenium Meeting, Grahamstown, South Africa.
7. Mashope, BK, Barnard, TG, Lomniczi, B, Van Heerden, E, Bragg, RR, and Albertyn, J (24-28 January 2000). An epidemiological survey of Newcastle Disease Virus in South Africa, BioY2K Combined Millenium Meeting, Grahamstown, South Africa.
8. Van Zyl, AE, Carlisle, E, Van Heerden, E, Bragg, RR, and Albertyn, J (24-28 January 2000). Structural analysis of the plasmid encoding NAD- independence in Haemophilus paragallinarum, BioY2K Combined Millenium Meeting, Grahamstown, South Africa.
9. Taole, M, Van Heerden, E, Albertyn, J, and Bragg, RR (24 - 28 January 2000). The effects of NAD-independence on the virulence of Haemophilus paragallinarum. BioY2K Combined Millenium Meeting, Grahamstown, South Africa.
10. Nel, S, Van Heerden, E, and Litthauer, D (24-28 January 2000). An investigation into the stability of the pure lipase from Aspergillus niger, BioY2K Combined Millenium Meeting, Grahamstown, South Africa.
11. Nel, S, Van Heerden, E, Bragg, RR, and Albertyn, J. (2 - 5 April 2002) Cloning of Xyn A gene of thermomyces langinosus and expression in Saccharomyces cerevisiae. 12th Bienniel Congress of the South African Society of Microbiology, Bloemfontein.
12. Nel, S, Van Heerden, E, Albertyn, J, and Bragg, RR. Cloning, Expression and characterisation of a xylanase to improve the feed conversion in chickens. Annual conference of the South African parrot Breeders Society – Potchefstroom. January 2002.
13. Bragg, RR, Paulse, EW Van Heerden, E, and Albertyn, J. Further evidence of the need for local vaccines for the control of infectious coryza. Annual conference of the South African parrot Breeders Society – Potchefstroom. January 2002.
14. Van Zyl, AE, Albertyn, J, Bragg, RR, and Van Heerden, E. Isolation and characterisation of a plasmid conferring NAD independence in Haemophilus paragallinarum. Annual conference of the South African parrot Breeders Society – Potchefstroom. January 2002.
15. Jansen van Rensburg, PJA, Van Heerden, E, Albertyn, J, Bragg, RR. Development of a transport medium for Haemophilus paragallinarum. Annual conference of the South African parrot Breeders Society – Potchefstroom. January 2002.
16. Taole, M, Van Heerden, E, Albertyn, J, Bragg, RR. Virulence of NAD independent Haemophilus paragallinarum. Annual conference of the South African parrot Breeders Society – Potchefstroom. January 2002.
17. Opperman, DJ, Van Heerden, E, Litthauer, D, and Kieft, T. Isolation, purification and characterisation of themostable chromate reductase from Themus multireducens. 18th Congress South African Society for Biochemistry and Molecular Biology,Pretoria. 6-9 July 2003.
18. Barnard, TG, Litthauer, D, Van Heerden, E, and Knoessen, S. Isolation, partial purification and characterisation of two thermophillic lipases from South African Gold mine isolates. 18^th Congress South African Society for Biochemistry and Molecular Biology,Pretoria. 6-9 July 2003.
19. Botes, E, Van Heerden, E, and Litthauer, D. Isolation and characterisation of Arsenate Reducing Bacteria from a South African Mine. 18^th Congress South African Society for Biochemistry and Molecular Biology,Pretoria. 6-9 July 2003.
20. Moller, C, Van Heerden, E, Litthauer, D, and Kieft, T. Isolation, purification and characterisation of thermostable Iron reductase from Thermus multireducens. 18^th Congress South African Society for Biochemistry and Molecular Biology,Pretoria. 6-9 July 2003.
21. Van Heerden, E, Litthauer, D, Davis, K, Phelps, TJ, Kieft, TL, Onstott, TC, and Pfiffner, SM. Hands-on research and educational workshop for United States and South African Undergraduates. 18^th Congress South African Society for Biochemistry and Molecular Biology,Pretoria. 6-9 July 2003. (presented by J van Marwijk).
22. South African Ultradeep Mines-Long term sites for interdisciplinary studies into the extreme environment of the deep subsurface. TC Onstott, L Lin, B Mislowac and M Davidson ¹, S Pfiffner ², E van Heerden and D Litthauer ³, T Phelps ⁴, D Moser, J Fredrickson, T Gihring and F Brockman ⁵, T Kieft and S McCuddy ⁶, D Boone and A Bonin ⁷, L Pratt and E Boice ⁸, B Sherwood Lollar, J Ward, G Slater ⁹, J Lippmann ¹⁰, G Southam and M Lengke ¹¹, E Trimarco and D Balkwil ¹², C Ralston and W Seymoor ¹³, B Bellamey ¹⁴, A van Heerden ¹⁵, D Nel and N Spoelstra ¹⁶, G Gilchrest and D Kershaw ¹⁷, R Wilson ¹⁸. July 2004. GeosciENCE aFRICA – JOHANNESBURG
23. C Möller*, E van Heerden, D Litthauer and T Kieft. Thermophilic ferric reductases from Thermus scotoductus. In: Abstracts of the SASBMB XIX^th Conference, 16-20 January 2005, Stellenbosch, South Africa.
24. Botes, E, Van Heerden, E, and Litthauer, D. Arsenate Resistance in Bacteria Isolated from an Antimony Mine in South Africa. In: Abstracts of the SASBMB XIX^th Conference, 16-20 January 2005, Stellenbosch, South Africa.
25. Barnard, TG, Litthauer, DL, and Van Heerden, E. Cloning, purification and characterisation of a lipase from Geobacillus thermoleovorans. In: Abstracts of the SASBMB XIX^th Conference, 16-20 January 2005, Stellenbosch, South Africa.
26. Forster, M, Piater, LA and Van Heerden, E. (2005) Innovative screening of the subsurface genome. In: Abstracts of the SASBMB XIX^th Conference, 16-20 January 2005, Stellenbosch, South Africa.
27. Bester, PA, Piater, LA, Van Heerden, E, and Onstott, TC. (2005) The microbial diversity, chemical and physical properties in fissure water of the deep terrestrial subsurface of the Witwatersrand Basin, South Africa. In: Abstracts of the SASBMB XIX^th Conference, 16-20 January 2005, Stellenbosch, South Africa.
28. Nthangeni, MB, Tlou, MG, Van Heerden, E, Esterhuyse, E, and Litthauer, D. Structure-function relationships of novel and chimeric Family VII bacterial carboxylesterases. In: Abstracts of the SASBMB XIX^th Conference, 16-20 January 2005, Stellenbosch, South Africa.
29. Opperman, DJ, Van Heerden, E*. and Onstott, TC. (2006). Chromate reduction by Thermus scotoductus strain SA-01. Abstracts of the SASM XIX^th Conference, 9-12 April 2006, Twsane, South Africa.
30. Bester, PA, Piater, LA*, Van Heerden, E, and Onstott, TC. (2006) The microbial diversity, chemical and physical properties in fissure water of the deep terrestrial subsurface of the Witwatersrand Basin, South Africa.. Abstracts of the SASM XIX^th Conference, 9-12 April 2006, Twsane, South Africa.
31. Raji, AI*, Möller, C, Litthauer, L, Van Heerden, E, and Piater, LA. (2006) Bacterial Biofilm Diversity of Deep Mines in South Africa. In: Lecture Abstracts of the SASBMB XX^th Conference, 3 –6 July 2006, Pietermaritzburg, South Africa, L65.
32. Visser, DF*, Hennessy, F, Chhiba, VP, Lakay, FM, Jordaan, J, Louw, M, Joubert, L, Van Heerden, E, Piater, LA, Möller, C, Litthauer, L, and Brady, D. (2006) Screening for novel enzyme activities in deep terrestrial environments: application of metagenomics and high throughput screening for novel enzyme isolation. In: Lecture Abstracts of the SASBMB XX^th Conference, 3–6 July 2006, Pietermaritzburg, South Africa, L36.
33. Tlou, MG,* Piater, LA, Van Heerden, E. (2006) Quantitative gene analysis of a constitutive and inducible lipase enzymes expressed in Geobacillus thermoleovornas GE-7. In: Abstracts of the SASBMB XX^th Conference, 3–6 July 2006, Pietermaritzburg, South Africa, P129.
34. Bester, PA, Piater, LA*, Van Heerden, E, and Onstott, TC. (2006) The microbial diversity, chemical and physical properties in fissure water of the deep terrestrial subsurface of the Witwatersrand Basin, South Africa. In: Abstracts of the 14^th Biennial Congress of the South African Society for Microbiology, 9-12 April 2006, Pretoria, South Africa, P173.
35. Hennessy, F*, Visser, DF, Chhiba, VP, Lakay, FM, Van Heerden, E, Piater, LA, Möller, C, Litthauer, L, and Brady, D. (2006) Identification of novel open reading frames from metagenomic libraries generated from extremophilic organisms: application of metagenomics and high throughput screening for novel enzyme isolation. In: Abstracts of the SASBMB XX^th Conference, 3 –6 July 2006, Pietermaritzburg, South Africa, P23.
36. Fuku, S,* Piater, LA, Van Heerden, E. (2006) Biological synthesis of Gold Nanoparticles. In: Abstracts of the SASBMB XX^th Conference, 3-6 July 2006, Pietermaritzburg, South Africa. .
37. Ojo, AO, Van Heerden, E, and Piater, LA*. Extremophiles from copper bioreactors and subsequent characterisation of copper resistance genes. Bio-08, January 21–25, 2008, Grahamstown, South Africa.
38. Abbia, NS, Van Heerden, E, Piater, LA, and Litthauer, D*. Improving cloning strategies for accessing extreme bacterial genomes. Bio-08, January 21–25, 2008, Grahamstown, South Africa.
39. Amelie Dukunde, Derek Litthauer, Esta van Heerden and Jacobus Albertyn. Improving Heterologous Protein Expression with Thermophilic, Bacterial Chaperones. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
40. 2.40 Elizabeth Ojo, Esta van Heerden and Lizelle Anne Piater. Investigation of the Copper Resistance Menhanism(s) in Acidophilic Bacteria. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
41. Errol Duncan Cason, Lizelle Anne Piater, and Esta van Heerden. Thermophilic microbial interaction and reduction of uranium(VI) by Thermus scotoductus SA-01. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
42. Godfrey Tlou, Lizelle Anne Piater, and Esta van Heerden. Geobacillus thermoleovorans GE-7 Lipase Production Profile – Two Lipase Activity Peaks, One Enzyme? SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
43. Jacqueline van Marwijk, Diederik Johannes Opperman, Mariekie Gericke, Esta van Heerden . Purification of a gold(III) reducing and nanoparticle producing protein from Thermus scotoductus SA-01. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
44. Mariana Erasmus, Jacobus Albertyn, José Berenguer, and Esta van Heerden. Characterisation and Expression of a Protein Involved in Gold Nanoparticle Formations by Thermus scotoductus SA-01. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
45. Suzanne Litthauer, Derek Litthauer, Jacobus Albertyn, and Esta van Heerden. Identification of Old Yellow Enzyme Homologues from Subsurface Thermophilic Cultures. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)
46. Walter Müller, Lizelle Anne Piater, Jacobus Albertyn, Esta van Heerden, and Martha Smit. Cytochrome P450 Monooxygenases from the Genus Thermus. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17- 20 January 2010. (Poster)
47. Wilmarí Meyer, Lizelle Anne Piater, Esta van Heerden, and Jacobus Albertyn. Isolation and Characterisation of Cyanide Degrading Microorganisms. SASBMB 2010 - 22^nd Congress of the South African Society for Biochemistry and Molecular Biology. Bloemfontein, South Africa. 17-20 January 2010. (Poster)2.48 Errol Duncan Cason and Esta van Heerden. (2012). Isolation and functional screening of anaerobic diesel oil degrading micro-organisms. 29 Jan–1 Feb 2012, Champagne Sports Resort, Drakensberg, South Africa. SASBMB/FASBMB Congress.
48. Mariana Erasmus, F Otto, TC Onstott, B Sherwood Lollar, F Colwell, TJ Phelps, MF DeFlaun, T Surridge and E van Heerden. (2012). The Impact of C)2 Sequestration in South Africa and the Reactivity of the Deep Subsurface Biome: a South African First.. 29 Jan–1 Feb 2012, Champagne Sports Resort, Drakensberg, South Africa. SASBMB/FASBMB Congress.
49. N Tlalajoe, D Mendoza, E Cason, E van Heerden, and DJ Opperman. 2012. Isolation and Characterisation of new Nitrilase from Cyanide imparted Bacillus sp. B4H3. 29 Jan–1 Feb 2012, Champagne Sports Resort, Drakensberg, South Africa. SASBMB/FASBMB Congress.
50. Maleke, P, Williams, E Botes, E van Heerden. 2012. Hexavalent Uranium Reduction by site-specific Bacteria in a Continuous Up-flow Bio-reactor. 29 Jan–1 Feb 2012, Champagne Sports Resort, Drakensberg, South Africa. SASBMB/FASBMB Congress.
51. Castillo, J, Ojo, AO, Posthumus, JJ, Gobber, R, Kuloyo, OO, and Van Heerden, E. 6-9 July 2014. Assessment microbial diversity in contamined soil with diesel (South Africa): Role of natural attenuation processes. Poster presented at the 24^th Biennial Congress of the South African Society of Biochemistry and Molecular Biology, Worcester, South Africa.
52. Diedericks, V, Cason, ED, and Van Heerden, E. 6-9 July 2014. Optimising conditions of upscale bioreactors for microbial hexavalent chromium reduction – identification of biomes. Poster presented at the 24^th Biennial Congress of the South African Society of Biochemistry and Molecular Biology, Worcester, South Africa.
53. Kuloyo, O, Linage-Alvarez, B, Ojo, A, Castillo, J, and Van Heerden, E. 6-9 July 2014. The search for Candidatus Desulforudis audaxviator yields additional sulphate reducing bacteria from a South African gold mine (2.8kmbls). Poster presented at the 24^th Biennial Congress of the South African Society of Biochemistry and Molecular Biology, Worcester, South Africa.
54. Maleke, M, Williams, PJ, Castillo, J, Ojo, A, DeFlaun, MF, and Van Heerden, E. 6-9 July 2014. Bioremediation of increasing levels of U(VI) based on the biostimulation of an indigenous bacterial community. Poster presented at the 24^th Biennial Congress of the South African Society of Biochemistry and Molecular Biology, Worcester, South Africa.
55. Moloantoa, KM, Castillo, J, Wan, M, Peiffer, S, and Van Heerden, E. 6-9 July 2014. Speciation of polysulfides generated by lepidocrocite reduction in the presence of sulphate reducing bacteria. Poster presented at the 24^th Biennial Congress of the South African Society of Biochemistry and Molecular Biology, Worcester, South Africa.

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