ahmed ahmed - Academia.edu (original) (raw)

Papers by ahmed ahmed

Journal of Food Biochemistry, 1978

Reproducible determinations of cell wall uronic acid content are obtained by first dissolving wal... more Reproducible determinations of cell wall uronic acid content are obtained by first dissolving wall samples in sulfuric acid and then performing assays on aliquots of the cell wall solution. The colorimetric assay utilizing m-hydroxydiphenyl is recommended because of its low background readings in the presence of large quantities of neutral sugars.

Lipids, 1984

The effect of supplementation with cod-liver oil containing eicosapentaenoic acid (EPA), 20∶5ω3, ... more The effect of supplementation with cod-liver oil containing eicosapentaenoic acid (EPA), 20∶5ω3, on bleeding times, thrombin-induced platelet aggregation, platelet protein, platelet cholesterol, and the level and fatty acid composition of individual phospholipids in the platelets of human subjects was determined. Measurement of these parameters was conducted before the subjects received the supplement (day 0), after they received the supplement for 14 days (day 14), and 14 days after the supplement was terminated (day 28) so as to monitor recovery. The mean bleeding times exhibited a marked increase (by 81%) with supplementation and returned to near basal (day 0) values within 14 days after the supplement was terminated. Cod-liver oil supplementation significantly reduced thrombin-induced platelet aggregation with a partial recovery being exhibited by day 28. The content of phospholipid, cholesterol and protein (μg/109 platelets) was not significantly different (P>0.05) when isolated from the subjects at day 0, 14 and 28, as neither were the composition of individual phospholipids [phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylinositol (PI) and sphingomyelin (SPH)] given as % of total phospholipid. However, the fatty acid compositions of all platelet phospholipids were altered significantly by the fish oil supplement. In PC, EPA rose from 0.3 to 2.9% of total fatty acids and docosahexaenoate from 0.7 to 1.8% concomitant with a drop in arachidonate (from 14.1 to 9.6%) and linoleate (from 10.2 to 7.9%); these levels approached basal levels 14 days after supplementation was terminated. The highest percentage of EPA with supplementation was found in PE (4.3%), while the arachidonate fell from 38.8 to 30.5%, with low percentages of EPA occurring in PS (0.7%) and PI (0.5%). The level of 24∶1 in SPH increased significantly (from 17.8 to 24.8) with supplementation and reverted to basal values by day 28. These results suggest a close relationship of the observed fatty acid changes in individual platelet phospholipids to the altered hematological parameters and platelet-vessel wall interactions produced by cod-liver oil supplementation.

American Journal of Veterinary Research, 2001

Objectives: to investigate classification and possible causes of dulaa disorders and effect of su... more Objectives: to investigate classification and possible causes of dulaa disorders and effect of surgical removal on male sexual desire. Animals: Twenty six male camels (age=6-13years) with dulaa injuries were admitted to the Veterinary Teaching Hospital, Qassim University, Saudi Arabia. Sixteen camels showed signs of protruding, fluctuating and edematous dulaas. Other ten camels showed signs of completely entrapped dulaas. Procedures: Under deep sedation and local infiltration anesthesia, injured dulaa was surgically amputated. Entrapped dulaa was gently pulled out before performing surgery. Results: Amputated protruded dulaa had ulcers, edema and hematoma. Entrapped dulaa had ulcers, impaction with food, fibrosis and penetrating wounds. None of the operated males showed reducing sexual desire 4 weeks after the operation. Conclusions and Clinical Relevance: It was concluded that injured dulaa was either protruded or entrapped. Sharpness of canine teeth may play a role of having dulaa injury in camels, so it is recommended to perform teeth rasping annually just before the reproductive season. Amputation of dulaa had no effect on male sexual desire in dromedary camels.

IEEE Transactions on Dependable and Secure Computing, 2007

Abstract—In this paper, we introduce a new form of behavioral biometrics based on mouse dynamics,... more Abstract—In this paper, we introduce a new form of behavioral biometrics based on mouse dynamics, 1 which can be used in different security applications. We develop a technique that can be used to model the behavioral characteristics from the captured data using artificial ...

In this paper we introduce the idea of using behavioral biometrics in intrusion detection applica... more In this paper we introduce the idea of using behavioral biometrics in intrusion detection applications. We present a new biometrics-based technique, which can be used to detect intrusion without the need for any special hardware implementation and without forcing the user to perform any special actions. The technique is based on using "keystroke dynamics" and "mouse dynamics" biometrics.

Journal of Food Biochemistry, 1978

Reproducible determinations of cell wall uronic acid content are obtained by first dissolving wal... more Reproducible determinations of cell wall uronic acid content are obtained by first dissolving wall samples in sulfuric acid and then performing assays on aliquots of the cell wall solution. The colorimetric assay utilizing m-hydroxydiphenyl is recommended because of its low background readings in the presence of large quantities of neutral sugars.

Lipids, 1984

The effect of supplementation with cod-liver oil containing eicosapentaenoic acid (EPA), 20∶5ω3, ... more The effect of supplementation with cod-liver oil containing eicosapentaenoic acid (EPA), 20∶5ω3, on bleeding times, thrombin-induced platelet aggregation, platelet protein, platelet cholesterol, and the level and fatty acid composition of individual phospholipids in the platelets of human subjects was determined. Measurement of these parameters was conducted before the subjects received the supplement (day 0), after they received the supplement for 14 days (day 14), and 14 days after the supplement was terminated (day 28) so as to monitor recovery. The mean bleeding times exhibited a marked increase (by 81%) with supplementation and returned to near basal (day 0) values within 14 days after the supplement was terminated. Cod-liver oil supplementation significantly reduced thrombin-induced platelet aggregation with a partial recovery being exhibited by day 28. The content of phospholipid, cholesterol and protein (μg/109 platelets) was not significantly different (P>0.05) when isolated from the subjects at day 0, 14 and 28, as neither were the composition of individual phospholipids [phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylinositol (PI) and sphingomyelin (SPH)] given as % of total phospholipid. However, the fatty acid compositions of all platelet phospholipids were altered significantly by the fish oil supplement. In PC, EPA rose from 0.3 to 2.9% of total fatty acids and docosahexaenoate from 0.7 to 1.8% concomitant with a drop in arachidonate (from 14.1 to 9.6%) and linoleate (from 10.2 to 7.9%); these levels approached basal levels 14 days after supplementation was terminated. The highest percentage of EPA with supplementation was found in PE (4.3%), while the arachidonate fell from 38.8 to 30.5%, with low percentages of EPA occurring in PS (0.7%) and PI (0.5%). The level of 24∶1 in SPH increased significantly (from 17.8 to 24.8) with supplementation and reverted to basal values by day 28. These results suggest a close relationship of the observed fatty acid changes in individual platelet phospholipids to the altered hematological parameters and platelet-vessel wall interactions produced by cod-liver oil supplementation.

American Journal of Veterinary Research, 2001

Objectives: to investigate classification and possible causes of dulaa disorders and effect of su... more Objectives: to investigate classification and possible causes of dulaa disorders and effect of surgical removal on male sexual desire. Animals: Twenty six male camels (age=6-13years) with dulaa injuries were admitted to the Veterinary Teaching Hospital, Qassim University, Saudi Arabia. Sixteen camels showed signs of protruding, fluctuating and edematous dulaas. Other ten camels showed signs of completely entrapped dulaas. Procedures: Under deep sedation and local infiltration anesthesia, injured dulaa was surgically amputated. Entrapped dulaa was gently pulled out before performing surgery. Results: Amputated protruded dulaa had ulcers, edema and hematoma. Entrapped dulaa had ulcers, impaction with food, fibrosis and penetrating wounds. None of the operated males showed reducing sexual desire 4 weeks after the operation. Conclusions and Clinical Relevance: It was concluded that injured dulaa was either protruded or entrapped. Sharpness of canine teeth may play a role of having dulaa injury in camels, so it is recommended to perform teeth rasping annually just before the reproductive season. Amputation of dulaa had no effect on male sexual desire in dromedary camels.

IEEE Transactions on Dependable and Secure Computing, 2007

Abstract—In this paper, we introduce a new form of behavioral biometrics based on mouse dynamics,... more Abstract—In this paper, we introduce a new form of behavioral biometrics based on mouse dynamics, 1 which can be used in different security applications. We develop a technique that can be used to model the behavioral characteristics from the captured data using artificial ...

In this paper we introduce the idea of using behavioral biometrics in intrusion detection applica... more In this paper we introduce the idea of using behavioral biometrics in intrusion detection applications. We present a new biometrics-based technique, which can be used to detect intrusion without the need for any special hardware implementation and without forcing the user to perform any special actions. The technique is based on using "keystroke dynamics" and "mouse dynamics" biometrics.