1. Sayed, O.H. and Y.S. Masrahi, 2023. Climatology and phytogeography of Saudi Arabia. A review. Arid Land Res. Manage., 37: 311-368.
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2. Sayed, O.H., Y.S. Masrahi and M. Remesh, 2020. Environmental impact of desert dam reservoir in arid habitat. Asian J. Plant Sci., 19: 191-199.
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3. Sayed, O.H., Y.S. Masrahi, M. Remesh and B.S. Al-Ammari, 2019. Coffee production in southern Saudi Arabian highlands: Current status and water conservation. Saudi J. Biol. Sci., 10.1016/j.sjbs.2019.03.002.
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4. Sayed, O.H., 2019. Critical treatise on university ranking systems. Open J. Social Sci., 7: 39-51.
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5. Remesh, M., Y.S. Masrahi and O.H. Sayed, 2019. First report of Phragmites australis (Poaceae) in the Southwest of Saudi Arabia. Saudi J. Biol. Sco. (In Press). .
6. Sayed, O.H. and Y.S. Masrahi, 2018. Chlorophyll fluorescence: Theory and applications. A review. J. Jazan Univ., Vol. 5. .
7. Remash, M., Y.S. Masrahi and O.H. Sayed, 2018. Phragmites australis (Poaceae): New addition to flora of Southwestern Saudi Arabia. Saudi J. Biol. Sci., 10.1016/j.sjbs.2018.11.001.
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8. Masrahi, Y.S., M. Remesh and O.H. Sayed, 2017. Enumeration of the Flora of Wadi Lajab Saudi Arabia. Ecol. Environ. Conserv., 23: 99-106.
9. Masrahi, Y.S. and O.H. Sayed, 2017. Invasive Opuntia stricta: Case study in Southwestern Saudi Arabia. Ecol. Environ. Conserv., 23: 195-201.
10. Thomas, J., M.A. El-Sheikh, A.H. Alfarhan, A.A. Alatar and M. Sivadasan et al., 2016. Impact of alien invasive species on habitats and species richness in Saudi Arabia. J. Arid Environ., 127: 53-65.
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11. Sayed, O.H. and Y.S. Masrahi, 2016. Dictionary of Plant Names. Okaz Press, Jeddah.
12. Masrahi, Y.S., T.A. Al-Turki and O.H. Sayed, 2016. Comparative ecophysiology and photoprotection in two stem succulent Euphorbia species in arid habitat. Ecol. Balkanica, 8: 77-84.
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13. Masrahi, Y.S., T.A. Al-Turki and O.H. Sayed, 2015. Photosynthetic adaptation and survival strategy of Duvalia velutina in an extremely arid environment. Photosynthetica, 53: 555-561.
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14. Elhaes, H., A. Al-Hossain, O. Sayed and M. Ibrahim, 2015. Modeling the effect of salinity on soil organic matter. Quant. Matter, 4: 94-97.
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15. Al-Robaie, A.A., Z.I. Al-Fifi, O.H. Sayed and F.S. Abo-Zina, 2015. Cell Biology. Okaz Press, Riyadh.
16. Al-Turki, T.A., Y.S. Masrahi and O.H. Sayed, 2014. Photosynthetic adaptation of Euphorbia fractiflexa (Euphorbiaceae) and survival in arid regions of the Arabian Peninsula. J. Plant Interact., 9: 107-111.
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17. Al-Turki, T.A., O.H. Sayed and Y.S. Masrahi, 2014. Physiotypic plasticity and survival of arido-active Euphorbia triaculeata (Euphorbiaceae) in its natural habitat. Ecol. Balkanica, 6: 35-41.
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18. Masrahi, Y.S., T.A. Al-Turki and O.H. Sayed, 2012. Geographical distribution and chorology of grasses in the Arabian Peninsula. Flora-Morphol. Distrib. Funct. Ecol. Plants, 207: 250-256.
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19. Masrahi, Y.S., T.A. Al-Turki and O.H. Sayed, 2012. Crassulacean acid metabolism permutation and survival of Caralluma species (Apocynaceae) in arid habitats. Ecol. Balkanica, 4: 63-71.
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20. Masrahi, Y.S., M.N. Al-Yemeni, T.A. Al-Turki and O.H. Sayed, 2012. Structural and functional adaptations of the stem succulent Cralluma acutangula to its natural habitat. Kuwait J. Sci. Eng., 39: 155-169.
21. Masrahi, Y.S., M.N. Al-Yemeni and O.H. Sayed, 2012. Nurse association of the stem succulent Caralluma acutangula in its natural habitat. Ekologia, 31: 46-53.
22. Masrahi, Y.S., T.A. Al-Turki and O.H. Sayed, 2011. Wolffiella hyalina (Delile) Monod (Lemnaceae)-a new record for the flora of Saudi Arabia. Feddes Repertorium, 121: 189-193.
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23. Masrahi, Y.S., M.N. Al-Yemeni, T.A. Al-Turki and O.H. Sayed, 2011. Ecophysiological mechanisms of succulent survival in natural conditions: Photosynthetic carbon fixation in Caralluma acutangula (Decne. Ne.Br.) (Asclepiadaceae). Polish J. Ecol., 59: 381-389.
24. Masrahi, Y.S., A.A. Al-Huqail, T.A. Al-Turki and O.H. Sayed, 2011. Differential altitudinal distribution and diversity of plants with different photosynthetic pathways in arid Southern Saudi Arabia. Aust. J. Basic Applied Sci., 5: 36-43.
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25. Sayed, O.H., 2003. Chlorophyll fluorescence as a tool in cereal crop research. Photosynthetica, 41: 321-330.
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26. Sayed, O.H., 2001. Crassulacean acid metabolism 1975-2000, a check list. Photosynthetica, 39: 339-352.
27. Sayed, O.H., 2001. Aridity and Plant Survival in Desert Environments. In: Ecology of Desert Environments, Prakash, I. (Ed.)., Scientific Publishers, Judhpur, India, pp: 78-103.
28. Sayed, O.H., 2000. Introductory Botany. Engineering Bureau Pubs., Cairo, Page: 125.
29. Sayed, O.H. and M.K. Mohamed, 2000. Altitudinal changes in photosynthetic pathways of floristic elements in Southern Sinai, Egypt. Photosynthetica, 38: 367-372.
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30. Sayed, O.H. and A.M. El-Shahed, 2000. Growth, photosynthesis and circadian patterns in Chlorella vulgaris (Chlorococcales, Chlorophyta) in response to growth temperature. Cryptogamie Algol., 21: 283-290.
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31. Al-Bayoumi, A., Y. Saleh and O.H. Sayed, 2000. Fundamentals of Botany. El-Dar El-Arabia, Cairo, Page: 541.
32. Sayed, O.H., 1998. Phenomorphology and ecophysiology of desert succulents in eastern Arabia. J. Arid Environ., 40: 177-189.
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33. Sayed, O.H., 1998. Analysis of photosynthetic responses and adaptation to nitrogen starvation in Chlorella using in vivo chlorophyll fluorescence. Photosynthetica, 35: 611-619.
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34. Sayed, O.H., 1997. Appraisal into phytochemistry and taxonomy of an old plant collection from the Middle East. Qatar Univ. Sci. J., 17: 121-126.
35. Sayed, O.H., 1996. Adaptational responses of Zygophyllum qatarense Hadidi to stress conditions in a desert environment. J. Arid Environ., 32: 445-452.
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36. Sayed, O.H. and M.J. Emes, 1996. Control of photosynthetic electron transport in isolated wheat thylakoids. Photosynthetica, 32: 513-520.
37. Al-Bayoumi, A., Y. Saleh, O.H. Sayed and A. Turki, 1996. Plant Biology. University Press, Doha, Qatar Page: 522.
38. Sayed, O.H., 1995. Effects of temperature on growth, morphology and photosynthesis in wheat. Biol. Plantarum, Vol. 37. 10.1007/BF02912997.
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39. Sayed, O.H., 1995. Effect of the expected sea level rise on Avicennia marina L. A case study in Qatar. Qatar Univ. Sci. J., 15: 91-94.
40. Sayed, O.H., M.J. Earnshaw and M.J. Emes, 1994. Characterization of the heat‐induced stimulation of Photosystem‐I‐mediated electron transport. Acta Bot. Neerlandica, 43: 137-143.
41. Sayed, O.H., M.J. Earnshaw and M. Cooper, 1994. Growth, water relations and CAM induction in Sedum album in response to water stress. Biol. Plantarum, Vol. 36. 10.1007/BF02920936.
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42. Sayed, O.H., 1994. Edaphic gradients and species attributes influencing the distribution of flora in littoral salt marshes of Qatar. Qatar Univ. Sci. J., 14: 257-262.
43. Sayed, O.H., 1994. Condition and trend of a depression-type habitat in rainfed desert rangelands of Qatar in response to fertilizer application. Qatar Univ. Sci. J., 14: 289-292.
44. Sayed, O.H. and S. Wilson, 1994. Nature of the Aflatoxin B₁-induced inhibition of photosynthesis in Chlorella fusca (Chlorococcales, Chlorophyta). Qatar Univ. Sci. J., 14: 66-70.
45. Sayed, O.H. and A.K. Hegazy, 1994. Growth-specific phytomass allocation in Mesembryanthemum nodiflorum as influenced by CAM induction in the field. J. Arid Environ., 27: 325-329.
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46. Sayed, O.H., 1993. Ecophysiological characteristics, distribution and nutritional value of desert range plants in Qatar. Qatar Univ. Sci. J., 13: 243-246.
47. Sayed, O.H., 1992. Photosynthetic acclimation to high temperatures in wheat. Acta Bot. Neerlandica, 41: 299-304.
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48. Sayed, O.H. and E.M. Fadl-Allah, 1992. Influence of aflatoxin B1 on growth, photosynthetic oxygen evolution and regreening of Chlorella fusca (Chorococcales, Chlorophyta). Cryptogamie Algol., 13: 45-48.
49. Sayed, O.H. and A.K. Hegazy, 1992. Inhibition of secondary carotenoid biosynthesis during degreening of Chlorella fusca (Chlorococcales, Chlorophyta) and implications for growth and survival. Cryptogamie Algol., 13: 181-186.
50. Sayed, O.H., 1991. Phenylpyridazinone herbicides as inhibitor of photosynthetic electron transport in isolated wheat chloroplasts. Bull. Sci., Assiut Univ., 20: 1-8.
51. Sayed, O.H., 1991. Conformational changes in isolated wheat thylakoids aging in vitro as reflected by changes in photosynthetic electron transport. Bull. Sci., Assiut Univ., 20: 105-112.
52. Sayed, O.H. and A.K. Hegazy, 1991. Life table analysis and ecophysiology of Mesembryanthemum nodiflorum in its natural environment. Acta Oecol., 12: 753-760.
53. Fadl-Allah, E.M. and O.H. Sayed, 1991. Proline accumulation and osmoregulation in Aspergillus melleus. Bull. Facul. Sci., 20: 207-221.
54. Sayed, O.H. and M.M. Tantawy, 1990. Action of the phenyl-pyridazinone herbicides BASF 33650 and BASF 44521 on the green and orange cells of Chlorella fusca. J. Pest Control Environ. Sci., 2: 127-137.
55. Sayed, O.H., M.J. Emes, M.J. Earnshaw and R.D. Butler, 1989. Photosynthetic responses of different varieties of wheat to high temperature. I. Effect of growth temperature on development and photosynthetic performance. J. Exp. Bot., 40: 625-631.
56. Sayed, O.H., M.J. Earnshaw and M.J. Emes, 1989. Photosynthetic responses of different varieties of wheat to high temperature II. Effect of heat stress on photosynthetic electron transport. J. Exp. Bot., 40: 633-638.
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57. Sayed, O.H., M.J. Emes, R.D. Butler and M.J. Earnshaw, 1986. High temperature induced changes in chloroplast ultrastructure, leaf fluorescence,and photosynthesis photosynthesis in wheat varieties. Biochem. Soc. Trans., 14: 59-59.
58. Ahmed, A.M., M.D. Heikal and O.S. Hindawy, 1983. Side effects of benomyl (Fungicide) treatments on sunflower, cotton and cowpea plants. Phyton, 23: 185-195.
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