Prof. Peter Twumasi

Associate Professor

Dept: Biochemistry and Biotechnology
Dept. Of Biochemistry And Biotechnology,
Faculty of Biosciences
College of Science
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Research Areas/Interests

Whilst in the Wageningen University, he developed an Apoptotic Model in Zinnia Plant Cell Culture System which is today considered the best model for ...~more

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Publications

    Published peer reviewed papers

    1.  Gowans L.J.J., Busch T.D., Mossey P.A., Eshete M.A., Adeyemo W.L., Aregbesola B., Donkor P., Arthur F.K.N., Agbenorku P., Olutayo J., Twumasi P., Braimah R., Oti A.A., Plange-Rhule G., Obiri-Yeboah S., Abate F., Hoyte-Williams P.E., Hailu T., Murray J.C. and Butali A. (2017). The prevalence, penetrance, and expressivity of etiologic IRF6 variants in orofacial clefts patients from sub-Saharan Africa. Molecular Genetics & Genomic Medicine 5(2): 164-171. doi: 10.1002/mgg3.273; Online ISSN: 2324-9269.
    2. Mensah J. K. M. and Twumasi P. (2016). Use of pineapple waste for single cell protein (SCP) production and the effect of substrate concentration on the yield. Journal of Food Process Engineering, DOI 10.1111/jfpe.12478.
    3. Gowans, L. J., Adeyemo, W. L., Eshete, M., Mossey, P. A., Busch, T., Aregbesola, B., Donkor, P., Arthur, F. K., Bello, S. A., Martinez, A., Li, M., Augustine-Akpan, E. A., Deressa, W., Twumasi, P., Olutayo, J., Deribew, M., Agbenorku, P., Oti, A. A., Braimah, R., Plange-Rhule, G., Gesses, M., Obiri-Yeboah, S., Oseni, G. O., Olaitan, P. B., Abdur-Rahman, L., Abate, F., Hailu, T., Gravem, P., Ogunlewe, M. O., Buxo, C. J., Marazita, M. L., Adeyemo, A. A., Murray and J. C., Butali, A. (2016). Association Studies and Direct DNA Sequencing Implicate Genetic Susceptibility Loci in the Etiology of Nonsyndromic Orofacial Clefts in Sub-Saharan African Populations. Journal of Dental Research, 95(11):1245-1256.
    4. Twumasi P., Tandoh M.A., Borbi M.A., Ajoke A.R., Owusu-Tenkorang E., Okoro R. and Dumevi R.M. (2016). Assessment of the levels of cadmium and lead in soil and vegetable samples from selected dumpsites in the Kumasi Metropolis of Ghana. African Journal of Agricultural Research, 11(18):1608-1616.
    5. Twumasi P., Prasad R., Nyako M. O., Amoako T. N. E. and Talukdar S. (2014). Assessing microbiological contamination of drinking water from Barekese Water Treatment Plant in the Kumasi Metropolis using PCR and microbial culturing techniques. Ghana Journal of Chemistry, 2(1): 46-57.
    6. Twumasi P., Acquah E.W., Quain M.D. and Parkes E.Y. (2014). Use of simple sequence repeat (SSR) markers to establish genetic relationships among cassava cultivars released by different research groups in Ghanaian. J. Gen. Mol. Bio. 6(3):29-36.
    7. Twumasi, P., Nsiah, K. and Osei, E.Y. (2014). Treatment of lead-poisoned rats through oral administration of palm oil extracts. African Journal of Biochemistry Research, 8(2):43-51.
    8. Twumasi, P., Ohene-Mensah, G. and Moses, E. (2014). The rot fungus Botryodiplodia theobromae strains cross infect cocoa, mango, banana and yam with significant tissue damage and economic losses. African Journal of Agricultural Research. 9(6): 613-619.
    9. Twumasi, P. (2014). GM Foods: Understanding the science and the Ghanaian Society. Daily Graphic, Ed(s) 4 February 2014 (p.10), 6 February 2014 (p.36), 8 February 2014 (p.32). (graphic.com.gh/features/opinion/16924-gm-foods-understanding-the-science-and-the-ghanaian-society.html).
    10. Twumasi, P., Moses, E. and Ohene-Mensah, G. (2013). Molecular characterization of cocoa, mango, banana and yam isolates of Botryodiplodia theobromae in Ghana. of the Ghana Science Association, 15(1):42-52. [ISSN: 0855-3823].
    11. De-Heer, N. E., Twumasi, P., Tandoh, M. A., Ankar-Brewoo and Oduro, I.G. (2013). Formulation and sensory evaluation of herb tea from Moringa oleifera, Hibiscus sabdariffa and Cymbopogon citratus. of the Ghana Science Association, 15(1):53-62. [ISSN: 0855-3823].
    12. Twumasi, P., P, Nsiah, K. (2013). Comparative Study on Diagnosis of Urinary tract infection among adolescents in the Kumasi Metropolis using dipstick, culture and PCR methods. J. of the Ghana Science Association, 15(1):63-70. [ISSN: 0855-3823].
    13. Darko, S.N., Nsiah, K and Twumasi, P. (2013). Prevalence of papc and usp virulence factors in uropathogenic Escherichia coli causing asymptomatic urinary tract infections in adolescents. British Microbiology Research Journal, 3(3): 423-430.
    14.  14. Fletcher, E.K.A. Amoako, T.N.E. and Twumasi, P. (2011). Effect of 2,4-D, explants type and cultivar on the callogenesis expression of cassava (Manihot esculenta Crantz) in Ghana. African Journal of Biotechnology. 10(46), pp. 9396-9401.
    15. Acquah, E.W., Quain, M. D. and Twumasi, (2011). Genetic relationships between some released and elite Ghanaian cassava cultivars based on distance matrices. African Journal of Biotechnology 10(6): pp. 913-921.
    16. Twumasi, P., Schel, J.H.N. and van Ieperen, W. (2010). Osmotic potential of Zinnia elegans plant material affects the yield and morphology of tracheary elements produced in vitro. African Journal of Biotechnology 9(51): pp. 8712-8721.
    17. Mensah, F.O., Twumasi, P., Amenawonyo, X.K., Larbie, C. and Baffo Jnr, A.K. (2010). Pica practice among pregnant women in the Kumasi metropolis of Ghana. Pica practice among pregnant women in the Kumasi metropolis of Ghana. Royal Society of Tropical Medicine 2(4): 282-286.
    18. Twumasi, P., Iakimova, E. T., Gian, T., van Ieperen, W., Schen, J. H. N., Emons, A.M.C., van Kooten, O. and Woltering, E.J. (2010). Caspase inhibitors affect the kinetics and dimensions of tracheary elements in xylogenic Zinnia (Zinnia elegans) cell cultures. BMC Plant Biol. 10:162.
    19. Twumasi, P., Schel, J. H., van Ieperen, W., Woltering, E., van Kooten, O. and Emons, A. M. (2009). Establishing in vitro Zinnia elegans cell suspension culture with high tracheary element differentiation. Cell Biol Int. 33(4): 524-533.
    20. Twumasi, P., Schel, J. H. N. and van Ieperen, W. (2009). Differential effects of temperature on stem length and xylem vessel length distribution in Zinnia elegans. Journal of Horticultural Science and Biotechnology 84 (5) 531-535.
    21. Twumasi, P., van Ieperen, W., Woltering, E.J., Emons, A.M.C., Schel, J.H.N., van Meeteren, U., van Marwijk, D. (2005). Effects of water stress during growth of xylem anatomy, xylem functioning and vase life in three Zinnia elegans Acta Horticulturae 669:303 - 312.
    22.  Part of MSc results published in: Limpens E, Franken C, Smit P, Willemse J, Bisseling T, Geurts R. (2003). LysM domain receptor kinases regulating rhizobial Nod factor-induced infection. Science 302:630-633. [Peter Twumasi in Acknowledgement].
    23. Twumasi, P., Nkansah, A.N., Fei-Baffoe, B., Yeboah, K.Y., Addo, E.O.K. and Adom-Appau, I. (2013). Managing Fire Outbreaks in Ghana. Onesal Multimedia, Accra. [ISBN 978-9988-1-8531-2].
    24. Prasad, R., Kumar, A., Upadhyaya, C. P., Prasad, K. S., Twumasi, P., Bagde, U. S. and Varma, A. (2012). Biotechnology: A Global Scenario. In: Environment and Biotechnology (Prasad R and Kumar A) LAP LAMBERT Academic Publishing, Germany. pp.1-22. [ISBN 978-3-659-15457-7].
    25. Twumasi, P. (2007), Hydraulic properties of Zinnia elegans: from cellular development in vitro to performance in planta. In Thesis: Wageningen University and Research Centre. [S.l.] : [s.n.], - p. 160.  Promotor(en): Emons, Prof dr A.M.C.; Kooten, Prof dr O. van, co-promotor(en): Ieperen, Dr ir W. van; Schel, Dr J.H.N.
    26. Twumasi, P. (2003): The Medicago truncatula Genome as reference for Legume Crops. In Thesis: MSc Biotechnology Degree Programmme, Wageningen University. The Netherlands. Supervisors: Prof. Dr. Ton Bisseling; Co-supervisors: Dr. Rene Guerts; Dr. Olga Kulikova (Molecular Biology Lab, Wageningen University, The Netherlands).
    27. Twumasi, P. (1999): Production of wine from banana juice. In Thesis: B.Sc. Biochemistry Degree Programme, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana. Supervisor: Dr K.B. Egyankor.

     

    Meetings, Conference Proceedings, Abstracts and Workshops

    1. Twumasi, P. (2016). Introduction to Biotechnology. In: Proceedings of Open Forum for Agricultural Biotechnology (OFAB)/Alliance for Science (AFS) Workshop on Biotech Communication, College of Science Auditorium, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi. September 30, 2016. (Conference paper).
    2. Twumasi, P. (2016). Efficient waste and sanitation management for sustainable development: The role of science, technology and innovation. In: Proceedings of 15th Biennial Workshop of Ghana Science Association (GSA), Erata Hotel, East Legon, Accra. August 3, 2016. (Attendance).
    3. Twumasi, P. (2016). Funding of Science and Technology Research in Ghana. In: 3rd Proceedings of College of Science Research Retreat. Pempamsie Hotel and Conference Centre, Cape Coast, Ghana. July 14-17, 2016. (Conference paper).
    4. Twumasi, P. (2016). Borlaug Fellowship Workshop on Advances in Biotechnology and International Policy Landscape. International Centre for Innovative Lerning (ICIL) Building, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi. March 3, 2016. (Attendance).
    5. Twumasi, P. (2016). Fly Neuroscience Workshop: Drosophila as a Tool for Understanding Brain and Behaviour, organized by The Department of Biochemistry and Biotechnology in collaboration with FLiACT delegates from Europe. Ibis Tek Boardroom, College of Science, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi. December 14-18, 2015. (Attendance).
    6. Gowans LJJ, Busch T, Eshete M, Adeyemo W, Aregbesola B, Donkor P, Arthur FNK, James O, Twumasi P, Braimah R, Agbenorku P, Plange-Rhule G, Obiri-Yeboah S, Abate F, Hailu T, Murray JC and Butali A (2016). The complex penetrance and expressivity of IRF6 gene in the aetiology of syndromic and nonsyndromic human orofacial clefts in the African population. In: Proceedings of 7th International Conference on birth defects and disabilities in the developing world. Dar es Salaam, Tanzania. September 21-24, 2015. (Conference paper).
    7. Twumasi, P. (2015). Sustainable development of Tertiary Institutions in Ghana amidst Economic and Security Challenges. In: Proceedings of 5th KNUST Summer School, College of Science Auditorium, organized by Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. August 17-20, 2015. (Attendance).
    8. Jallow , E. A, Twumasi, P., Mills Robertson, F.C. and Dumevi, R (2015). Assessment of aflatoxin contents of rice, maize, groundnuts and beans collected from the Kumasi Central Market using HPLC, microbial culturing and molecular markers. In: Proceedings of 29th Biennial Conference of Ghana Science Association (GSA), University for Development Studies, Tamale, Ghana. 3-4 August, 2015. (Conference paper).
    9. Twumasi, P. (2014). Workshop on the Cartegena Protocol on Biosafety and Related Obligations: Improving and awareness of National Biotechnology and Biosafety Policy Document, organized by the Biotechnology and Nuclear Agricultural Research Institute (GAEC-BNARI), National Biosafety Committee (NBC) and CSIR-Crops Research Institute. Biotechnology Complex Building, CSIR-Crop Research Institute, Fumesua, Kumasi. September 18, 2014. (Participant).
    10. Twumasi, P. (2014). Advancing Science and Technology through effective communication. In: Proceedings of 4th KNUST Summer School, College of Science Auditorium, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana. August 18-22, 2014. (Attendance).
    11. Twumasi, P. (2014). Principles and practices of traditional breeding and genetic modification for GMOs. In: Proceedings of 14th Biennial Workshop of Ghana Science Association (GSA), Auditorium 900, University of Cape Coast (UCC), Cape Coast, Ghana. August 7, 2014. (Conference paper).
    12. Twumasi, P. (2014). Introduction to Biotechnology. In: Workshop on Stakeholders sensitization/Awareness creation on biotechnology in Ghana. Organized by the United States of American Embassy in Accra, Ghana. Biotechnology Complex, CSIR-Crop Research Institute, Fumesua, Kumasi. June 17, 2014. (Conference paper).
    13. Twumasi, P. (2014). Genetically modified food: opportunities and imaginary risk. In: Proceedings of Ghana Biotech Mass Media Outreach Program, organized by United States of American Embassy in Accra, Ghana. Nobewom (Ashanti Region), and Techiman and Sunyani (Brong Ahafo Region). June 2-4, 2014. (Conference paper).
    14. Twumasi, P. (2014). Radio programmes on Ghana Biotech Mass Media Outreach Program, Garden City Radio and Metro FM, Kumasi, Ashanti Region, Ghana. United States of American Embassy, Accra, Ghana. June 2-4, 2014. (Conference paper).
    15. Twumasi, P (2014). Workshop on academic mentorship by the Office of the Vice Chancellor. University of Science and Technology (KNUST), College of Science Auditorium, Kumasi. 2nd April, 2014. (Attendance).
    16. Twumasi, P. Science and Technology: Turning Research into Solutions. In: Proceedings of Third One-Day Research and Poster Presentations of Ghana Science Association, Kumasi Branch. April 10, 2014. (Conference paper).
    17. Twumasi, P., Akromah, R., Tetteh, A. and Antwi (2013). Some of the ongoing Biotech projects in Ghana: KNUST in focus. In: Proceedings of South Africa-Ghana Joint Research and Development Symposium on Biotechnology and ICT. La Palm Royal Beach Hotel, Accra. 21-22 November, 2013. (Conference paper).
    18. Twumasi, P., Makafui, B. and Opoku-Kusi Jr., G. (2013). Heavy metallic and microbial concentration of vegetable crops grown on refuse dumpsites in the Kumasi Metropolis. In: Proceedings of 28th Biennial Conference of Ghana Science Association (GSA), University of Ghana, Legon, Accra, Ghana. 14-19 July 2013 (Conference paper).
    19. Twumasi, P., Oppong, A. A., Amoah-Antwi, C. and Opoku-Kusi Jr, G. (2013). Assessment of nosocomial infections and antibiotic resistance levels in two hospitals in the Kumasi Metropolis. In: Proceedings of 28th Biennial Conference of Ghana Science Association (GSA), University of Ghana, Legon, Accra, Ghana. 14-19 July 2013 (Conference paper).
    20. Twumasi, P., Dy-yakah, C. D., Okyere, M., Afful, B. and Opoku-Kusi Jr, G. (2013). Assessing the prevalence of urinary tract infection in school children in the Kumasi Metropolis using classical microbial culturing technique and PCR. In: Proceedings of 28th Biennial Conference of Ghana Science Association (GSA), University of Ghana, Legon, Accra, Ghana. 14-19 July 2013 (Conference paper).
    21. Twumasi, P., Yeboah, E. and Nsiah, K. (2013). Treatment of lead-poisoned rats through oral administration of different palm oil extracts. 28th Biennial Conference of Ghana Science Association (GSA), University of Ghana, Legon, Accra, Ghana. 14-19 July 2013 (Conference paper).
    22. Twumasi, P. (2013). Harnessing Indigenous Scientific and Technological Knowledge for Development. In: Proceedings of Second One-Day Research and Poster Presentations of Ghana Science Association, Kumasi Branch. April 10, 2013. (Conference paper).
    23. Darko, S., Twumasi, P. and Nsiah, K. Comparative Diagnosis and prevalence determination of urinary tract infection by Escherichia coli using dipstick, culture and PCR in an adolescent population. 5th Annual Conference of Ghana Biomedical Convention, Noghuchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana. 30 July-1 August 2012. (Conference paper).
    24. Twumasi, P., Towards the sustainability of Agriculture in the light of the Oil Find in Ghana: The Way Forward. In: Proceedings of 13th Biennial Workshop of the Ghana Science Association held at Cocoa Research Institute of Ghana (CRIG), Akim-Tafo. August 1, 2012. (Attendance).
    25. Dwamena A. K., Oppong, R. F. and Twumasi, P. Paternity profiling of children from selected families at Bomso in the Kumasi metropolis using ABO blood grouping system and DNA fingerprinting. In: Proceedings of 5th Annual Conference of Ghana Biomedical Convention, Noghuchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana. 30 July-1 August 2012. (Conference paper).
    26. Oppong, R.F., Okoro, R. and Twumasi, P. Heavy metallic and microbial contamination of vegetables cultivated on refuse dumpsites in Kumasi. In: Proceedings of 5th Annual Conference of Ghana Biomedical Convention, Noghuchi Memorial Institute for Medical Research, University of Ghana, Legon, Accra, Ghana. 30 July-1 August 2012. (Conference paper).
    27. Twumasi, P. DRUSSA Research uptake implementation planning event held at Centre for Business Development Conference Room at the Commercial Area, KNUST, Kumasi. November 15, 2012. (Attendance).
    28. Twumasi, P. (2012). Science and technology research. In: Proceedings of First One-Day Research and Poster Presentations of Ghana Science Association, Kumasi Branch. April 10, 2012. (Conference paper).
    29. Twumasi, P. Bioinformatics of next-generation sequence for plant breeding and medical data analysis, College of Science Auditorium, KNUST, Kumasi. March 14, 2012. (Attendance).
    30. Twumasi, P., Biochemistry, its relevance and career opportunities, Ghana Biochemistry Students Association (GBSA), KNUST, Kumasi. October 5, 2011. (Conference paper)
    31. Twumasi, P. What can I do after school? Biochemistry and Food Science Christian Fellowship-KNUST, Kumasi. October 14, 2011. (Conference Paper).
    32. Twumasi, P., Mensah, F. O., Nsiah, K., Arthur, F.K.N and Firempong, C. Health talk on Hepatitis B Virus, hypertension, diabetes, nutrition and health, and urinalysis and urinary tract infections (Resource Person) for Teachers of the Tafo Sub-Metro of Ghana Education Service, Tafo Methodist, Kumasi.  November 25, 2011. (Conference Paper).
    33. Twumasi, P., Mensah, F. O., Nsiah, K., Arthur, F.K.N and Firempong, C. Health talk on Hepatitis B Virus, hypertension, diabetes, nutrition and health, and urinalysis and urinary tract infections (Resource Person) for Teachers of the Asokwa Sub-Metro of Ghana Education Service, Ahensan Methodist Church in Asokwa Sub-Metro, Kumasi. November 25, 2011. (Conference Paper).
    34. Twumasi, P, Mensah, F. O., Nsiah, K., Arthur, F.K.N and Firempong, C. Health talk on Hepatitis B Virus, hypertension, diabetes, nutrition and health, and urinalysis and urinary tract infections (Resource Person) for Teachers of the Subin Sub-Metro of Ghana Education Service, Nat Hall, Subin Sub-Metro, Kumasi. November 18, 2011. (Conference Paper).
    35. Twumasi, P., Mensah, F. O., Nsiah, K., Arthur, F.K.N and Firempong, C. Health talk on Hepatitis B Virus, hypertension, diabetes, nutrition and health, and urinalysis and urinary tract infections (Resource Person) for Teachers of the Bantama Sub-Metro of Ghana Education Service, State Boys, Bantama Sub-Metro, Kumasi. October 28, 2011. (Conference Paper).
    36. Twumasi, P., What can I do after School? Biochemistry and Food Science Christian Fellowship, Department of Biochemistry and Biotechnology, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. October 14, 2011 (Conference paper).
    37. Twumasi, P., Sourcing for funding for postgraduate research in Ghana and beyond. Second GRASAG-KNUST Postgraduate Research Conference, Great hall, KNUST, Kumasi. March 2011. (Conference paper).
    38. Twumasi, P., Biochemistry; its relevance and career opportunities. Department of Biochemistry and Biotechnology, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. October 5, 2011 (Conference paper).
    39. Twumasi, P., Life is born out of death: the interplay of apoptosis, cellulose biosynthesis and xylogenesis. Amity Institute of Microbial Technology, Amity University, Uttar Pradesh, India. June 5 – September 5, 2011 (Conference Paper).
    40. Twumasi, P., Kwame Nkrumah University of Science and Technology (KNUST): Ghana’s Premier University. Amity Institute of Microbial Technology, Amity University, Uttar Pradesh, India. August 29, 2011 (Conference Paper).
    41. Twumasi, P., Molecular Genetics and Forensic Science. Amity Institute of Microbial Technology, Amity University, Uttar Pradesh, India. June 5 – September 5, 2011 (Conference Paper).
    42. Twumasi, P., Stewardship awareness creation workshop for NARS, Universities and MDAs (SABIMA). Miklin Hotel at Shiashi in Accra, Ghana September 22 -23, 2010 (Conference Paper).
    43. Twumasi, P., Enlightening our generation. Kumasi Academy Senior High School, Kumasi. March 2010. (Conference paper).
    44. Twumasi, P. Open Educational Resource (OER) Workshop held at Conference Room, faculty of Pharmacy and Pharmaceutical Sciences, KNUST, Kumasi. October 8, 2010. (Attendance).
    45. Twumasi, P., Empowerment: self-empowered, physical, social and spiritual growth. Womens’s Commission-KNUST, Law Auditorium, KNUST. Kumasi, Ghana. September 4, 2010 (Conference paper).
    46. Twumasi, P. Two-Day Orientation workshop for New Staff of KNUST organized by Quality Assurance and Planning Units (QAPU) and the Human Resource Division. Academic Board Conference Room, Great Hall of KNUST, Kumasi. October 18-19, 2010. (Attendance).
    47. Twumasi, P., Dzandu C. K., Amoako, T.N.E. (2009). Evaluation of the seroprevalence of Hepatitis B virus in two communities in Kumasi. Abstract: EMBO Conference proceedings, 29 August – 1 September 2009. Amsterdam, The Netherlands. (Conference paper).
    48. Twumasi, P., Ohene-Nyako, M. and Amoako, T.N.E. (2009). Detection of waterborne pathogens using polymerase chain reaction and culture analysis. Abstract: 26th Biennial Conference of the Ghana Science Association. 4 – 9 August 2009. Cape Coast, Ghana. (Conference paper).
    49. Twumasi,, Xenyo, A.A. and Amoako, T.N.E. (2009). Detection of hepatitis B virus in human serum using immunoassay and PCR. Abstract: 26th Biennial Conference of the Ghana Science Association. 4 – 9 August 2009. Cape Coast, Ghana. (Conference paper).
    50. Twumasi, P. The Impact of role model on the lives of children, Anyinasuso Junior High School, Anyinasuso-Tepa, December 2009. (Conference paper).
    51. Twumasi, P. IFS Proposal Writing Meeting organized by CREPA, IFS and KNUST. NODA Hotel, Kumasi. October 27-30, 2008. (Attendance).
    52. Twumasi, P. (2009). Sourcing for funding for Postgraduate Research in Ghana and beyond. Presented at GRASAG Research Conference in Ghana, March, 2009. (Conference paper).
    53. Twumasi, P. and Amankwaah, E. 3-Day Workshop on Examination/Registration Software and Online Systems by ICT-KNUST, ICT Centre, Great Hall of KNUST, Kumasi. March 18-20, 2009. (Attendance)
    54. Twumasi, Zinnia elegans: a model system for studying cell differentiation and cellulose synthesis. Presented at seminar organized by KCCR-Kumasi, KCCR, KNUST, Kumasi, Ghana, March 2008. (Conference paper).
    55. Twumasi, P. Workshop for Examination Invigilators by College of Science, KNUST, Kumasi, Ghana. November 23, 2007. (Attendance).
    56. Twumasi, P. Potential areas of research collaboration and funding, Rothamsted Research Group in collaboration with Royal Society network Scheme (UK) Conference, Kumasi Centre for Research and Tropical Medicine (KCCR), KNUST, Kumasi, Ghana. May 28, 2008. (Conference paper).
    57. Twumasi, P.; Ieperen, W. van; Kooten, O. van; Emons, A.M.C.; Schel, J.H.N.; and Woltering, E.J., J. Effects of water stress on xylem anatomy, xylem functioning and vase life during growth of two Zinnia elegans cv's. Presented in Fl., USA. August 2004. (Conference paper).
    58. Twumasi, P.; Woltering, E.J.; Ieperen, W. van; Emons, A.M.C. Manipulation of programmed cell death in xylogenic Zinnia elegans suspension cell cultures influences the kinetics and dimensions of tracheary elements produced. In: Plant Biology 2006: Joint meeting of the American Society of Plant Biologists and the Canadian Society of Plant Physiologists, Boston, Massachusetts, USA, 5 -9 August 2006. - Plant Biology Boston MA USA: American Society of Plant Biologists. (Conference paper).
    59. Twumasi, P.; Woltering, E.J.; Ieperen, W. van; and Emons, A.M.C. Manipulation of programmed cell death in xylogenic Zinnia elegans suspension cell cultures influences the kinetics and dimensions of tracheary elements produced. Presented in Boston MA, USA, 2006. (Conference paper).
    60. Twumasi, P.; Ieperen, W. van; Kooten, O. van; Emons, A.M.C.; Schel, J.H.N.; Woltering, E.J.; Ernst, J. (2004). Effects of water stress on xylem anatomy, xylem functioning and vase life during growth of two Zinnia elegans cv's. In: Plant Biology 2004, Annual Meeting, ASPB, Lake Buena Vista, USA, 2004. - Lake Buena Vista, Fl. USA. (Conference paper).
    61. Twumasi, P. van Ieperen, W.; Woltering, E.; Emons, A.M.C.; Schel, J.H.N.; Snel, J.; van Meeteren, U.; and van Marwijk, D. Effect of growing conditions on the vase life of Zinnia elegans cut flowers. 8th International Symposium on Postharvest Physiology of Ornamentals (in conjunction with QualiFlor 2003). Presented in The Netherlands, August 2003. (Conference paper).

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