Assistant Professor | Assistant Professor

Address: Dept. of Botany & Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia | Phone: +11-4675807

المنشورات و المؤلفات

An overview of wetlands of Saudi Arabia: Values, threats, and perspectives
The wetlands of Saudi Arabia are located in a water-stressed region that is highly vulnerable to climate and other global changes. Sebkhas, mudflats, mangroves, and wadis are the dominant wetlands in the arid regions of North Africa and the Arabian...
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Neuroprotective Activity of Garcinia pedunculata Roxb. ex Buch.-Ham. Fruit Extract Against Aluminium Chloride Induced Neurotoxicity in Mice.
Aluminium chloride (AlCl3) is a known potent environmental neurotoxin causing progressive neurodegenerative changes in brain. The present study was aimed to evaluate the neuroprotective activity of aqueous extract of fruit rind of Garcinia...
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Endemics and endangered species in the biodiversity hotspot of the Shada Mountains, Saudi Arabia
Shada Mountains in Saudi Arabia, separated by Maleel Wadi into twin mountains (i.e., Shada Alalah and Shada Asfal), are rich in biodiversity. We investigated the diversity of endemic and endangered species of the mountains based on the data...
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Development of quality standards of medicinal mistletoe – Helicanthes elastica (Desr.) Danser employing Pharmacopoeial procedures
Helicanthes elastica (Desr.) Danser (Loranthaceae), commonly known as Indian mango mistletoe, is a parasitic shrub found widely growing on mango trees in southern India. Development of monographic quality standards is need of the hour for...
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Schuster, A., Burghardt, M., Alfarhan, A., Bueno, A., Hedrich, R., Leide, J., Thomas, J. and Riederer, M. 2016 Effectiveness of cuticular transpiration barriers in a desert plant http://aobpla.oxfordjournals.org/content/early/2016/05/05/aobpla.plw02
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Sunil Kumar, K.N.; Rajakrishnan, R Thomas, J. and Aadinaath Reddy, G. 2016. Hepatoprotective effect of Helicanthus elastica. Bangladesh J Pharmacol 11: 525-530.
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K.N. Sunil Kumar, K.R. Maruthi, A.H. Alfarhan, R. Rajakrishnan, Jacob Thomas. 2016. Molecular fingerprinting of Helicanthus elastica (Desr.) Danser growing on five different hosts by RAPD. Saudi J. Bio. Sci. 23, 335–340
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Thomas, J.; El-Sheikh, M.A.; Alfarhan, A.H.;,Alata, A.A., Sivadasan,M.; Basahi, M., Al-Obaid, S.; Rajakrishnan, R 2016. Impact of alien invasive species on habitats and species richness in Saudi Arabia. Journal of Arid Environments 127: 53-65.
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Hussain, S., Aldryhim, Y., Al-Dhafer, H., Halbert, S.E. & Thomas, J. 2015. New aphid records for Saudi Arabia (Hemiptera: Aphidoidea). Zoology in the Middle East. 61(4): 368-371. (dx.doi.org/10.1080/09397140.2015.1101927. ISI Journal).
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Thomas, J., Basahi, R. Al-Ansari , A.E. Sivadasan, M. El-Sheikh, M.A. Alfarhan, A;H. Al-Atar, A, A. 2015. Additions to the Flora of Saudi Arabia: Two New Generic Records from the Southern Tihama of Saudi Arabia. National Academy Science Letters I
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Mark van Kleunen,…………, Jacob Thomas, Mauricio Velayo, Jan J.Wieringa & Petr Pysˇek. 2015. Global exchange and accumulation of non-native plants. Nature 525 (7567): 100-103. (ISI Journal).
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Al-Rehaily, A., Thomas, J.,Yusuf, M., Sivadasan, M. Alfarhan, A.H., El-Sheikh, M.A., Alatar, A. 2015. Taxonomy and distribution of two newly recorded genera in Saudi Arabia. Kuwait J. Sci. 42 (3) pp. 158-169. (ISI Journal).
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Abdulrahman A. Alatar, Mohamed A. El-Sheikh, Jacob Thomas, Ahmad K. Hegazy, Hosam A. El Adawy 2015. Vegetation, Floristic Diversity,and Size-Classes of Acacia gerrardii in an Arid Wadi Ecosystem Arid Land Research and Management. 29:335–359. ISI Journ
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Abduljaleel, V.; Sivadasan, M.; Alfarhan, A.H.; Thomas, J. & Alatar, A.A. 2014. Revision of Amorphophallus Blume ex Decne. Sect. Amorphophallus (Araceae) in India. Bangladesh J. Plant Taxon. 21(2): 105-120. (ISI Journal).
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Thomas, J. Sivadasan M., Al-Ansari, A.M.; Ahmed Alfarhan, Mohamed El-Sheikh, Mohamed Basahi.2014. New generic and species records for the flora of Saudi Arabia. Saudi Journal of Biological Sciences, 21: 457-464. (ISI Journal).
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Hegazy, A.K.; A. A. Alatar, Thomas, J., M. Faisal, A. H. Alfarhan and K. Krzywinski. 2014. Compatibility and complementarity of indigenous and scientific knowledge of wild plants in the highlands of southwest Saudi Arabia. Journal of Forestry Research
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Alaklabi1, A.; Arif, I.A.; Bafeel, S.O.; Alfarhan, A.H.; Ahamed, A.; Thomas, J. and Bakir, M. A. 2014. Nucleotide based validation of the endangered plant Diospyros mespiliformis (Ebenaceae) by evaluating short sequence region of plastid rbcL gene.
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El-Sheikh, M.A.; Thomas, J.; Alatar, A.A.; Hegazy, A.K.; Abbady, G.A. Alfarhan, A.H.; Okla, M.I. 2013. Vegetation of Thumamah Nature Park: a managed arid land site in Saudi Arabia. Rend. Fis. Acc. Lincei, 24:349–367. (ISI Journal).
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Al-Qurainy, F.; Gaafar, A.Z; Khan, S., M. Nadeem, M.; Tarroum, M.; Alaklabi, A. and Thomas, J. 2013. Antibacterial activity of leaf extract of Breonadia salicina (Rubiaceae), an endangered medicinal plant of Saudi Arabia. Genetics and Molecular Resea
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Raj, M. S.K., Sivadasan, M.; Veldkamp, J.F.; Alfarhan, A.H. & Thomas, J. 2013. Nanooravia, a new genus of subtribe Dimeriinae (Poaceae – Panicoideae – Andropogoneae) from India. Nordic J. Botany. 31 (2): 161-165 (ISI journal).
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Thomas, J., El-Sheikh, M. A., Alatar, A. A., Alfarhan, A. H. and Sivadasan, M. 2013. Distribution and abundance of Astragalus L., in some of the peripheral populations in the central region of Saudi Arabia. Pakistan Journal of Botany 45(2): 525-534. (
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Jaleel, V. A., Sivadasan, M., Alfarhan, A.H., Thomas, J. & Alatar, A. A. 2012. A Taxonomic Revision of Amorphophallus Blume ex Decne. Sect. Conophallus (Schott) Engl. (Araceae) in India. Bangladesh J. of plant taxonomy 19(2): 135-153. (ISI journal).
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Alatar, A.A., Mohamed El-Sheikh, M. A. & Thomas, J. (2012), Vegetation analysis of Wadi Al-Jufayr, a hyper arid region in Central Saudi Arabia, Saudi Journal of Biological Sciences 19 (3): 357–368 (ISI Journal).
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Bafeel, S.O.; Alaklabi, A.; Arif, I.A.; Khan, H.A.; Alfarhan, A.H.; Ahamad, A.; Thomas, J.; Bakir, M.A. (2012). Ribulose-1, 5-biphosphate carboxylase (rbcL) gene sequence and random amplification of polymorphic DNA (RAPD) profile of regionally endang
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Shanavaskhan, A. E., M. Sivadasan, Ahmed H. Alfarhan & Thomas, J. (2012). Ethnomedicinal aspects of angiospermic epiphytes and parasites of Kerala, India. Indian Journal of Traditional Knowledge. 11(2): 250-258 (ISI journal).
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Alaklabi, A.; Arif, I.; Bafeel, S.; Khan, H. Alfarhan, A.; Ahamad, A.; Thomas, J. and Bakir. M. (2012). Characterization of regionally endangered tree species Mimusops laurifolia (Forssk.) Friis by rbcL gene sequence and RAPD profile, International Jo
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Sujanapal, P., M. K. Ratheesh Narayanan, N. Anil Kumar, M. Sivadasan, Alfarhan, A.H. & Thomas, J. (2012). Miliusa gokhalae, a New Species of Annonaceae from India with Notes on Interrelationships, Population structure and Conservation status. Phytotax
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Yahya, M.; Al-Turki, T.A. and Thomas, J. (2012). Odyssea mucronata (Forssk.) Stapf, Sesbania sericea (Willd.) Link. and Sesamum alatum Thonn – new discoveries for the flora of Saudi Arabia. Turkish J. of Botany, 36: 39-48 (ISI Journal)
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Arif I.A.; Bakir, M.A.; Khan, H.A.; Alfarhan, A,H.; Al Homaidan, A.A.; Ahamed A, Bafeel SO; Thomas, J. (2011). Comparative evaluation of PCR success with universal primers of maturase K (matK) and ribulose-1,5-bisphosphate carboxylase oxygenase large subu
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Jaleel, V. Abdul, M. Sivadasan, Ahmed H. Alfarhan, Thomas, J. & A. A. Alatar. (2011). Revision of Amorphophallus Blume ex Decne. Sect. Rhaphiophallus (Schott) Engler (Araceae) in India. Bangladesh Journal of Plant Taxonomy 18(1): 1-26. (ISI Journal)
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Basahi, M.A.; Thomas, J.; Al-Turki, T.A.; Alfarhan, A.H; Al-Atar, A.A. and Sivadasan, M. (2010) Current status and conservation efforts of Centaurothamnus maximus Wagenitz & Dittrich (Asteraceae), an endemic, endangered species from Arabian Peninsula, Pla
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Thomas, J.; Alfarhan, A.H.; Samraoui, B.; Sivadasan, M.; Bukhari, N.; Al-Atar, A.A. (2010) Floristic composition of the Farasan Archipelago in SE Red Sea and its affinities to phytogeographical regions. Arab Gulf Journal of Scientific Research 28(2):
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Al-Turki, T.A. and Thomas, J. (2010). An account on the floral dimorphism and ecology of the genus Moltkiopsis I.M. Johnst. (Boraginaceae) in Saudi Arabia. Turkish J. of Botany 34: 367-377. (ISI Journal)
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Alfarhan, A.H.; Sivadasan, M.; Thomas, J. & Samraoui, B. (110–114) Proposals to delete Articles 18.5, 18.6 and 19.7, replacing them with three Notes, and to provide consequent changes to App. IIB and to Articles 10.6, 11.1, 18.1, and 19.4. TAXON 59 (
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Alfarhan, A.H. Sivadasan, M. & Thomas, J. (2009). Proposal to conserve the name Loxsoma (Loxsomataceae) with that spelling. Taxon 58(4): 1370-1371. (ISI Journal)
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Harfi, H.A.; Alfarhan, A.H.; Al-Rasheid, K. and Thomas, J.(2009). Allergenic pollens of Saudi Arabian flora, Center of Excellence in Biodiversity Research, King Saud University.
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Thomas, J.; Alfarhan, A.H.; Akram. A. ; Miller, A.G.; & Othman, L. (2008) An account on the eastern limits of Afro-Arabian plants. Basic and applied dry land research, 2: 12-22.
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Alfarhan, A.H.; Aldjain, I.M.N. ; Thomas, J.; Miller, A.G.; Othman L. & Akram A. (2009). Botanic Garden in the Arabian Peninsula, Sibbaldia, The Journal of Botanic Garden Horticulture, No. 6: 189-203
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Varghese, M.; Yadav, S.S. & Thomas, J. (2006). Taxonomic status of some of the Tribulus species in the Indian Subcontinent, Saudi Journal of Biological Sciences, Saudi Journal of Biological Sciences, 13(1): 165-170.
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Thomas, J.; Yadav, S.S. & Varghese, M. (2005). Phytogeographic studies on the western Satpuda Mountains of Khandesh region in Maharashtra. Indian Forester 12: 213-230.
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Thomas, J.; Yadav, S.S.; Varghese, M. & Garud, B.D. (2004). Floristic Diversity of Satpuda Mountains in the Western Khandesh Region of Maharashtra, Plant Archives, Vol. 4(2): 209-222.
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A.H.Alfarhan, T.Al-Turki, Thomas, J. & R.A. Basahy (2002). Annotated list to the flora of Farasan Archipelago, Southern Red Sea, Saudi Arabia, Taeckholmia, 22(1): 1-33.
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A.H. Alfarhan & Thomas, J. (1999-2001) Key to flowering plant families in Saudi Arabia, Tamaricaceae, Flacourtiaceae, Buddlejaceae, Convolvulaceae, Lemnaceae, Cuscutaceae, Caprifoliaceae, Flora of the Kingdom of Saudi Arabia, Vols. I & II (1999-2001).
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A. H. Alfarhan, S. A. Chaudhary & Thomas, J. (1998) Notes on the Flora of Saudi Arabia. Journal of the College of Science, King Saud University. 10(1): 31-40.
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Noteworthy records on the Flora of Saudi Arabia. Journal of the Kuwait University. 24(1):123-130. (ISI Journal)
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Review of the genus Tribulus in Saudi Arabia, Arab Gulf Journal of Sci. Res. 14(2): 415-443 (ISI Journal)
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The Identification of flowering plant-families in Saudi Arabia . Saudi biological society. 225p.
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