Publications

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1984
Wahby, H., M. Quenemoen, and M. Helal, EGYPT WATER USE AND MANAGEMENT PROJECT, , 1984. Abstract
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Wahby, H., G. Quenemoen, M. Helal, and others, A procedure for evaluating the cost of lifting water for irrigation in Egypt, : Colorado State University. Libraries, 1984. Abstract
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1990
Hassan, A. A., U. A. Obaji, M. S. Wafi, N. E. Quuronfilan, H. H. Al-Masry, M. A. Al-Rays, and others, "Evaluation of domestic and wild Cucumis melo germplasm for resistance to the stunting disorder in United Arab Emirates.", Egyptian Journal of Horticulture, vol. 17, no. 2, pp. 181–199, 1990. Abstract
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Hassan, A. A., H. H. Al-Masry, U. A. Obajic, M. S. Wafi, N. E. Quronfilan, and M. A. Al-Rays, "Evaluation of domestic and wild Cucumis melo germplasm for resistance to the yellow stunting disorder in United Arab Emirates", Egyptian Journal of Horticulture (Egypt), 1990. Abstract
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1991
Hassan, A. A., N. E. Quronfilah, U. A. Obaji, M. A. Al-Rays, and M. S. Wafi, "Evaluation of domestic and wild citrullus germplasm for resistance to the yellow stunting disorder in the United Arab Emirates", Egyptian Journal of Horticulture (Egypt), 1991. Abstract
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Hassan, A. A., M. S. Wafi, N. E. Quronfilah, U. A. Obaji, M. A. Al-Rayis, and F. Al-Izabi, "Evaluation of wild and domestic lycopersicon accessions for tomato yellow leaf curl virus", Egyptian Journal of Horticulture (Egypt), 1991. Abstract
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Hassan, A. A., M. S. Wafi, N. E. Quronfilah, U. A. Obaji, M. A. AI-Rayis, and F. Al-lzabi, "Evaluation of wild and domestic Lycopersicon accessions to tomato yellow leaf curl virus resistance", Egyptian Journal of Horticulture, vol. 18, pp. 23–43, 1991. Abstract
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Hassan, A. A., M. S. Wafi, N. E. Quronfilah, U. A. Obaji, M. A. Al-Rayis, and F. Al-Izabi, "Screening for tomato yellow leaf curl virus resistance in wild and domestic Lycopersicon accessions", Tomato Genet Coop Rep, vol. 41, pp. 19–21, 1991. Abstract
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Hassan, A. A., N. E. Quronfilah, U. A. Obaji, M. A. Al-Rays, and M. S. Wafi, "Screening of domestic and wild Citrullus germplasm for resistance to the yellow stunting disorder in the United Arab Emirates", Cucurbit Genetics Coop. Rept, vol. 14, pp. 98–101, 1991. Abstract
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Hassan, A. A., H. H. Al-Masri, U. A. Obaji, M. S. Wafi, N. E. Quronfilah, and M. A. Al-Rays, "Screening of domestic and wild Cucumis melo germplasm for resistance to the Yellow-stunting disorder in the United Arab Emirates", Cucurbit Genetics Cooperative Report, vol. 14, pp. 56–58, 1991. Abstract
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1996
1997
Qudrat-Ullah, H., M. M. Saleh, and E. A. Bahaa, "Fish Bank ILE An interactive learning laboratory to improve understanding of The Tragedy of Commons a common behaviour of complex dynamic systems", Proceedings of 15th International System Dynamics Conference Istanbul Turkey, 1997. Abstract
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1999
Qiu, S. G., S. Krishnan, N. el-Guendy, and V. M. Rangnekar, "Negative regulation of Par-4 by oncogenic Ras is essential for cellular transformation.", Oncogene, vol. 18, issue 50, pp. 7115-23, 1999 Nov 25. Abstract

Oncogenic variants of the cellular Ras protein are often associated with different types of human cancers. However, the mechanisms by which oncogenic Ras induces transformation are not fully established. Expression of the transcriptional repressor Par-4 was down-regulated by oncogenic Ras via the Raf-MEK-ERK pathway. Restoration of Par-4 levels by abrogation of the Raf-MEK-ERK pathway with the MEK-inhibitor PD98059 or by ectopic Par-4, that acted to inhibit ERK expression and activation, was sufficient to suppress oncogenic Ras-induced transformation. These findings identify Par-4 as a novel target that has to be down-modulated by oncogenic Ras for successful transformation.

Nalca, A., S. G. Qiu, N. el-Guendy, S. Krishnan, and V. M. Rangnekar, "Oncogenic Ras sensitizes cells to apoptosis by Par-4.", The Journal of biological chemistry, vol. 274, issue 42, pp. 29976-83, 1999 Oct 15. Abstract

Certain mutations in the mammalian ras gene are oncogenic and are often detected in human cancers. Oncogenic Ras induces the transcription activity of NF-kappaB that confers cell survival. Oncogenic Ras also down-modulates the expression of Par-4, a transcriptional repressor protein, that is essential but not sufficient on its own to induce apoptosis. Here we show that reintroduction of Par-4 by transient transfection leads to apoptosis in cells expressing oncogenic Ras but not in those that lack oncogenic Ras expression. Par-4 abrogates oncogenic Ras-inducible NF-kappaB transcription activity but does not interfere with cytoplasmic activation, or the DNA binding activity, of NF-kappaB. Because abrogation of NF-kappaB transcription activity is sufficient to cause apoptosis in cells expressing oncogenic Ras, our findings identify Par-4 as a novel example of a pro-apoptotic protein that selectively inhibits oncogenic Ras-dependent NF-kappaB function at the transcription level and suggest a mechanism by which Par-4 expression may selectively induce apoptosis in oncogenic Ras-expressing cells.

2000
Wang, L. - Q., N. Nakamura, M. R. Meselhy, M. Hattori, W. - M. ZHAO, K. - F. CHENG, R. - Z. YANG, and G. - W. QIN, "Four mono-tetrahydrofuran ring acetogenins, montanacins BE, from Annona montana", Chemical and pharmaceutical bulletin, vol. 48, issue 8: The Pharmaceutical Society of Japan, pp. 1109-1113, 2000. Abstract
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Wang, L. - Q., M. R. Meselhy, Y. Li, G. - W. QIN, and M. Hattori, "Human intestinal bacteria capable of transforming secoisolariciresinol diglucoside to mammalian lignans, enterodiol and enterolactone", Chemical and pharmaceutical bulletin, vol. 48, issue 11: The Pharmaceutical Society of Japan, pp. 1606-1610, 2000. Abstract
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2001
Wang, L. - Q., M. R. Meselhy, Y. Li, N. Nakamura, B. - S. MIN, G. - W. QIN, and M. Hattori, "The heterocyclic ring fission and dehydroxylation of catechins and related compounds by Eubacterium sp. strain SDG-2, a human intestinal bacterium", Chemical and pharmaceutical bulletin, vol. 49, issue 12: The Pharmaceutical Society of Japan, pp. 1640-1643, 2001. Abstract
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Osama Abdel-Ghaffar, and A. A. Qurtam, "Parasitological, hematological and biochemical assessment of the efficacy of Ro 15-5458 against the Egyptian strain of Schistosoma mansoni in mice.", Journal of Egyptian German Society of Zoology, vol. 36, issue A, pp. 571-603, 2001.
Shahba, M. A., Y. Qian, H. G. Hughes, and D. Christensen, "Cold Hardiness and soluble carbohydrates in saltgrass [Distichlis spicata (L.) Green]. 98th ASHS annual conference, Sacramento, CA, July 2001.", 98th ASHS annual conference, Sacramento, CA, July 2001., July, 2001.
2002
Hifny, Y., S. Qurany, S. Hamid, M. Rashwan, M. Atiyya, A. Ragheb, and G. Khallaaf, "ARABTALK: An implementation for arabic text to speech system", http://www. nemlar. org/ARAB-TALKRDI. doc Accessed December, vol. 14, pp. 2006, 2002. Abstract
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El-Zorkany, B. K., H. H. Ahmed, and N. K. Qenawy, "Clinical Risk factors for type I osteoporosis among postmenopausal Egyptian women", The Egyptian Rheumatologist , vol. 24, issue 2, pp. 283-294, 2002.
2003
Shahba, M. A., Y. L. Qian, H. G. Hughes, D. Christensen, and A. J. Koski, "Cold Hardiness of Saltgrass Accessions", Crop ScienceCrop Science, vol. 43, issue 6: John Wiley & Sons, Ltd, pp. 2142 - 2147, 2003. AbstractWebsite

Freezing tolerance is an environmental adaptation that significantly influences plant geographical distribution. Since differences in winter survival among saltgrass ecotypes have been observed in the field at Fort Collins, CO, the objective of this study was to determine the relative freezing tolerance, seasonal changes in the freezing tolerance, and winter survival of six accessions of saltgrass [Distichlis spicata var. stricta (L.) Greene]. Saltgrass accessions A65 and A29 were originally collected from Denver, CO, while C66 was from Humbolt Sink, NV, 32 from Wanship, UT, 55 from Hereford and 48 from Farmingdale, SD. These accessions were established in a field nursery at Fort Collins, CO. Rhizomes were sampled at monthly intervals from October 1999 through April 2000 and from October 2000 through April 2001 and subjected to laboratory freezing tests. Cold hardiness of the saltgrass accessions increased gradually during the fall with maximum hardiness occurring at midwinter. During midwinter, freezing tolerance was significantly different among accessions. Ranking of accessions for subfreezing temperature resulting in 50% mortality [LT50 (°C)] during January 2000 was A29 = 48 (?20.0) < 55 (?17.0) ≤ 32 (?15.5) ≤ A65 = C66 (?14.0). In January 2001, they were ranked with 48 = 55 (?26.0) < A65 = 32 (?23.0) < A29 (?20.0) = C66 (?18.5). In December and January sampling dates of the first season, accessions A29, 48, and 55 exhibited the highest relative regrowth when exposed to temperatures ≈ ?20.0°C. In midwinter of the second season, accession 55 showed the highest regrowth after being subjected to temperatures ≈ ?25.0°C. Accession C66 had the lowest regrowth potential after freezing treatments in both seasons. Winter survival in the field correlated negatively with LT50 value, with accessions 48, A29, and 55 demonstrating greater winter survival while C66 had the lowest percentage survival. The difference in freezing tolerance among accessions is in part associated with their origin-inherited adaptation. This information is useful for defining the potential adaptation range of saltgrass and in saltgrass breeding projects to select and develop freezing tolerant saltgrass.

Shahba, M. A., Y. L. Qian, H. G. Hughes, A. J. Koski, and D. Christensen, "Relationships of Soluble Carbohydrates and Freeze Tolerance in Saltgrass", Crop ScienceCrop Science, vol. 43, issue 6: John Wiley & Sons, Ltd, pp. 2148 - 2153, 2003. AbstractWebsite

Information is lacking regarding the changes of endogenous soluble carbohydrates of saltgrass [Distichlis spicata (L.) Greene] during cold acclimation. The objective of this study was to quantify soluble carbohydrates and their relationships to freezing tolerance in six saltgrass accessions (A65, A29, C66, 32, 55, and 48). The study was performed at monthly intervals under natural acclimation in two consecutive winter seasons (October 1999?April 2000 and October 2000?April 2001) at Fort Collins, CO. Concurrent with LT50 (subfreezing temperature resulting in 50% mortality) assessment, soluble carbohydrates, including sucrose, fructose, glucose, raffinose, and stachyose were measured by gas chromatography (GC). Results indicated significant differences among accessions and sampling dates in LT50 and carbohydrate content. Sucrose was the predominant sugar, but did not show a clear seasonal trend and had no correlation with freezing tolerance. Fructose, glucose, raffinose, and stachyose exhibited clear seasonal changes, reaching highest concentrations during midwinter. In December of both seasons, higher concentration of fructose and glucose were observed in 48 and 55 as compared with other accessions. Accession A29 had the highest concentration of raffinose in December and January in both seasons. A29 also had the highest stachyose content in midwinter of 1999-2000. Higher fructose, glucose, or raffinose concentrations were frequently observed in accessions of 48, 55, and A29, which coincided with their lower LT50 as compared with the other accessions. In contrast, C66 had the lowest sugar concentrations, which related to its sensitivity to low temperatures. These results indicate that fructose, glucose, raffinose, and stachyose may play important roles in saltgrass freezing tolerance.

2004
Atiyya, M., K. Choukri, C. Galinsky, S. Hamid, Y. Hifny, G. Khallaaf, S. Qurany, A. Raghed, and M. Rashwan, "Newsletter January-March 2004", Newsletter, 2004. Abstract
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Qian, Y. L., R. F. Follett, S. Wilhelm, A. J. Koski, and M. A. Shahba, "Carbon Isotope Discrimination of Three Kentucky Bluegrass Cultivars with Contrasting Salinity Tolerance", Agronomy JournalAgronomy Journal, vol. 96, issue 2: John Wiley & Sons, Ltd, pp. 571 - 575, 2004. AbstractWebsite

We evaluated leaf C isotope discrimination as affected by salinity among three Kentucky bluegrass (Poa pratensis L.) cultivars that differ in their salt tolerance. ?Moonlight?, ?NorthStar?, and ?P-105? Kentucky bluegrass (KBG) were grown in solution culture and exposed to salinity levels of 2.0, 5.0, 8.0, 11.0, and 14.0 dS m?1 for 12 wk. All cultivars exhibited increased leaf firing with increasing salinity. However, Moonlight and NorthStar exhibited less leaf firing than P105 at all salinity levels. The salinity levels that caused 25% shoot growth reduction were 4.9 dS m?1 for NorthStar and Moonlight and 4.1 dS m?1 for P105, indicating that Moonlight and NorthStar have better salinity tolerance than P105. When salinity level was in the range of 2.0 to 8.0 dS m?1, Moonlight produced 1.9-fold more root mass than NorthStar, and NorthStar exhibited 3.9-fold more root mass than P105. When salinity exceeded 8.0 dS m?1, NorthStar had similar root mass as Moonlight, and both showed greater root mass than P105. Cultivar P105 had a higher C isotope discrimination (?) than Moonlight and NorthStar under nonsaline conditions (<2 dS m?1) but a lower ? than Moonlight and NorthStar at 11.0 dS m?1 salinity. The great reduction in ? of P105 as salinity increased suggests that salinity induced a greater degree of stomatal resistance that provided less opportunity for discrimination against the heavier isotope. Carbon isotope discrimination may serve as a useful selection criterion in breeding efforts to develop salt tolerant KBG.