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Al Bayari J, Taha S, Suliman A, Osaili TM. The role of food handlers’ religious and organizational commitment in food hygiene practices: A structural modeling approach. Food Control 2023. [DOI: 10.1016/j.foodcont.2023.109732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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Olaimat AN, Taha S, Osaili TM, Aolymat I, Alzyoud JA, Al-Holy MA, Herzallah S, Al-Nabulsi ZA, Abu-Ghoush LM, Olaimat TM, Ayyash M, Holley RA. The Role of Communication and Commitment in COVID-19 Knowledge, Attitudes, and Behaviors Among University Students in Jordan: Interaction and Analysis. J Allied Health 2023; 52:149-159. [PMID: 37269034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 03/16/2022] [Indexed: 06/04/2023]
Abstract
INTRODUCTION Several fields, such as public health, economy, and science, have been adversely affected by the COVID-19 pandemic. The objectives of the present study were to investigate knowledge, attitudes, communication, commitment, and behavioral practices of Jordan university students; and using structural equation modelling (SEM) to investigate the relationship among COVID-19 knowledge, attitude, communication, commitment and behavioral practices of students. METHODS In this cross-sectional study, the primary data were collected from 1,095 students comprising 298 males (27.21%) and 797 females (72.79%) from three major universities in Jordan using an online-based questionnaire. RESULTS It was found that scores of knowledge, attitudes, communication, commitment, and behavioral practices of students about COVID-19 were 81.4, 79.3, 70.0, 72.6, and 67.4%, respectively. The results also showed that significant association the variables of knowledge and attitudes as well as the commitment and communication are partial mediators in this relationship. Further, a clear positive relationship was observed between the communication, commitment, and behavioral practices of students. CONCLUSIONS This study confirms the importance of communication and commitment to generate proactive behavioral practices.
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Affiliation(s)
- Amin N Olaimat
- The Hashemite University, PO Box 330127, Zarqa 13133, Jordan. Tel +962 5 390 3333 Ext. 5599.
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Osaili TM, Al-Nabulsi AA, Hasan F, Olaimat AN, Taha S, Ayyash M, Nazzal DS, Savvaidis IN, Obaid RS, Holley R. Antimicrobial effects of chitosan and garlic against Salmonella spp., Escherichia coli O157:H7, and Listeria monocytogenes in hummus during storage at various temperatures. J Food Sci 2022; 87:833-844. [PMID: 35028936 DOI: 10.1111/1750-3841.16025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 11/29/2021] [Accepted: 12/02/2021] [Indexed: 11/27/2022]
Abstract
The study aimed to evaluate the antimicrobial activity of 0.5 or 1% (w/w) chitosan and 1% (w/w) garlic against Salmonella spp., Escherichia coli O157:H7 and Listeria monocytogenes in hummus dip stored at 4, 10, or 25°C for 28, 21, or 7 days, respectively. In hummus without garlic, at all storage temperatures and storage periods, 0.5% chitosan decreased Salmonella spp., E. coli O157:H7, and L. monocytogenes by 0.9-2.3, 0.6-2.3, and 0.9-1.3 log CFU/g, respectively. In comparison, 1% chitosan decreased the numbers by 1.6-2.9, 1.4-2.7, and 1.3-1.8 log CFU/g, respectively. In hummus with 1% garlic, 0.5% chitosan decreased Salmonella spp., E. coli O157:H7, and L. monocytogenes by 0.7-2.5, 0.6-2.2, and 1.0-1.5 log CFU/g, respectively. Furthermore, 1% chitosan decreased the numbers by 1.6-2.8, 1.2-2.7, and 1.5-1.6 log CFU/g, respectively. With few exceptions, adding 1% garlic to hummus did not result in any significant reduction (at p < 0.05) in microbial numbers. The greatest decreases of Salmonella spp., E. coli O157:H7, and L. monocytogenes were 3.1, 3.6, and 2.9 log CFU/g with 1% chitosan held at 4°C for 28 days. The highest overall acceptability was for hummus with 0.5% chitosan + 1% garlic. Commercial use of chitosan is expected to help producers improve hummus safety. PRACTICAL APPLICATION: Hummus is consumed worldwide as a dip due to its taste and health benefits. Microbial safety of hummus can be enhanced by incorporating chitosan, derived from the natural polymer chitin, into the formulation. This enhanced recipe would be a bonus for producers and consumers alike.
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Affiliation(s)
- Tareq M Osaili
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, UAE.,Sharjah Institute for Medical Research, University of Sharjah, Sharjah, UAE.,Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Fayeza Hasan
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah, UAE
| | - Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Sadi Taha
- School of Business Administration, Al Dar University College, Dubai, UAE
| | - Mutamed Ayyash
- Department of Food, Nutrition and Health, College of Food and Agriculture, United Arab Emirates University (UAEU), Al Ain, UAE
| | - Dima S Nazzal
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Ioannis N Savvaidis
- Department of Environmental Health Sciences, College of Health Sciences, University of Sharjah, Sharjah, UAE.,Department of Chemistry, School of Natural Sciences, University of Ioannina, Ioannina, Greece
| | - Reyad S Obaid
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, UAE.,Sharjah Institute for Medical Research, University of Sharjah, Sharjah, UAE
| | - Richard Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
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Taha S, Osaili TM, Vij M, Vij A, Alhogaraty E, AL-Utaibi G, Albloush A, Nassoura A, Bohra OP, Altaher S. Measuring management practices impact on hygiene practices of food handlers: The mediating role of commitment and training perception. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Taha S, Kelany SH, D"ascenzo F, Hasan-Ali H, Ghzally Y, Abdel-Ghany M. RV function by cardiac magnetic resonance and its relationship with neutrophil/lymphocyte ratio in patients with acute inferior STEMI undergoing PPCI. Eur Heart J Cardiovasc Imaging 2021. [DOI: 10.1093/ehjci/jeab090.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Although acute inferior myocardial infarction (MI) is usually regarded as being lower risk compared with acute anterior MI, right ventricular (RV) myocardial involvement (RVMI) carries an increased risk of cardiovascular (CV) morbidity and mortality in patients with inferior MI.Cardiac Magnetic resonance (CMR) is ideal for assessing the RV because it allows a comprehensive assessment of cardiovascular morphology and physiology without most of the limitations that hinder alternative imaging modalities.
Objectives
To evaluate the sensitivity of other parameters;the neutrophil/ lymphocyte ratio (NLR) and RV function using 2D speckle tracking echo compared to (CMR) among patients with inferior STEMI undergoing primary percutaneous coronary intervention (PPCI).
Methodology
40 Patients with inferior MI who had PPCI were included in the study; two groups were highlighted according to the CMR derived RVEF RV dysfunction (RVD and non-RVD). NLR and 2D speckle tracking echo were done in comparison to RVEF.
Results
out of the 40 patients, 18 (45%) patients had RVD. ST segment elevation in the right leads was significantly higher (P-value =0.03) in patients with RV dysfunction (55.6%) in comparison with patients (22.7%) who had no RV dysfunction.When comparing groups according to the complications, heart block was significantly higher in patients with RV dysfunction (P-value= 0.008) as it occurred in 5 (27.8%) patients.Echocardiography was done for all patients, and it was found that fractional area change (FAC) in the RV dysfunction group appeared to be significantly reduced compared to the group without RV dysfunction (P-value =0.03). RV longitudinal strain (LS) by speckle tracking echo was reduced with an average of -19.5 ±3.9 % in the RV dysfunction group P value 0.008.Both CMR- derived RV SV, and EF were lower among the RV dysfunction group, (26.8 ± 15.8) ml and (35.4 ± 6.9) % respectively, with large RV systolic volume, with the highly statistically significant difference in comparison to the other group (p value = 0.000). Mean N/L ratio was higher (7.3 ± 5.2 (10^3/uL)) in the group with RV dysfunction compared to (6.4 ± 4.1(10^3/uL)) in the group with non RV dysfunction group. N/L ratio for predicting RV dysfunction by CMR had a cutoff value of >7.7 with low sensitivity (38.89%) and high specificity (77.27 %), while LS for predicting RV dysfunction by CMR had both high sensitivity (83.33%) and high specificity (63.64%) with P-value =0.005.
Conclusion
Our results showed that RV dysfunction in inferior MI is better detected using cardiac magnetic resonance imaging. In inferior STEMI patients who underwent primary PCI, NLR has low sensitivity but high specificity for predicting RVD when measured by cardiac MRI.
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Affiliation(s)
- S Taha
- Assuit Faculty of Medicine, Assuit, Egypt
| | - SH Kelany
- Assuit Faculty of Medicine, Assuit, Egypt
| | - F D"ascenzo
- Hospital "Città della Salute e della Scienza di Torino", Cardiologia 1, Turin, Italy
| | | | - Y Ghzally
- Assuit Faculty of Medicine, Assuit, Egypt
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Saeed BQ, Osaili TM, Taha S. Foodborne diseases risk factors associated with food safety knowledge and practices of women in Sharjah-United Arab Emirate. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108024] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Taha S, Osaili TM, Vij A, Albloush A, Nassoura A. Structural modelling of relationships between food safety knowledge, attitude, commitment and behavior of food handlers in restaurants in Jebel Ali Free Zone, Dubai, UAE. Food Control 2020. [DOI: 10.1016/j.foodcont.2020.107431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Al Jawad H, Rabiller-Baudry M, Loulergue P, Bejjani C, Lejeune A, Mawlawi H, Nasser G, Taha S. On the impact of ethanol on the rejection and transfer mechanism during ultrafiltration of a charged macromolecule in water/ethanol. Environ Technol 2020; 41:1950-1979. [PMID: 30481129 DOI: 10.1080/09593330.2018.1552724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
Ultrafiltration (UF) is a sustainable membrane separation technique. It could be useful for the concentration/purification of bio-sourced molecules that are extracted either by pure ethanol or by water/ethanol mixtures. Nevertheless, the process optimization requires an in-depth understanding of the transfer mechanisms of solute through membranes, especially for charged solutes, that are nowadays not sufficiently documented. Previous studies achieved in aqueous media have shown that the rejection of charged solutes by an UF membrane involves at least three mechanisms: convection, diffusion and electrostatic interactions. The present study aims at a systematic analysis of the transfer mechanisms of a model protein (lysozyme) in water/ethanol mixtures (100/0-70/30 v/v) during UF by a zirconia inorganic membrane. The influence of the pH varying in the 4-9 range and of the ionic strength (I) is also discussed. The ionic strength I can be adjusted by addition of an indifferent electrolyte (NaCl) only aiming at the screening of the electrostatic interactions or by addition of a selectively adsorbed electrolyte(KH2PO4) that is able to change the isoelectric pH of the protein and thus to modulate the electrostatic interactions in a different way when compared to NaCl. Of course, both salts have an impact on the protein rejection in UF. The results are analysed using the CDE model previously developed in our group to explain the behaviour of a single protein during UF in water and accounting for convection, diffusion and electrophoretic migration. The applicability of the CDE model in water/ethanol mixtures up to 70/30 v/v is finally shown.
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Affiliation(s)
- H Al Jawad
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), Rennes, France
- Université Libanaise, Laboratoire de Biotechnologie Appliquée: Biomolécules, Biothérapies et Bioprocédés du Centre AZM pour la Recherche en Biotechnologie et ses Applications, Beyrouth, Lebanon
| | - M Rabiller-Baudry
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), Rennes, France
| | - P Loulergue
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), Rennes, France
| | - C Bejjani
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), Rennes, France
- Faculté d'Agronomie et Médecine Vétérinaire, département Sciences et Technologies Agroalimentaires, Université Libanaise, Dekwaneh, Lebanon
| | - A Lejeune
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), Rennes, France
| | - H Mawlawi
- Université Libanaise, Laboratoire de Biotechnologie Appliquée: Biomolécules, Biothérapies et Bioprocédés du Centre AZM pour la Recherche en Biotechnologie et ses Applications, Beyrouth, Lebanon
| | - G Nasser
- Faculté d'Agronomie et Médecine Vétérinaire, département Sciences et Technologies Agroalimentaires, Université Libanaise, Dekwaneh, Lebanon
| | - S Taha
- Université Libanaise, Laboratoire de Biotechnologie Appliquée: Biomolécules, Biothérapies et Bioprocédés du Centre AZM pour la Recherche en Biotechnologie et ses Applications, Beyrouth, Lebanon
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ElSaeedy HI, Al Ahmari AAS, Abd El-Rahman KF, Taha S. Effect of Nano-Silica on The Thermo-Physical Properties of the Thermal Eutectic (Na0.6K0.4)NO3 System. EES 2020; 3:p59. [DOI: 10.22158/ees.v3n1p59] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Here, we investigate the effect of adding nano-silica particles on the thermo-physical properties of the (Na0.6K0.4)NO3 based thermal energy storage systems. Five different systems tagged as M00, M01, M02, M03 and M04, with different nano-silica percentage of 0, 1, 2, 3, and 4 wt%, respectively, were prepared. Various experimental techniques were employed to study the thermo-physical properties of the systems during (solid-solid) phase P1, (solid-liquid) phase P2 and (liquid-solid) phase P3, and to clarify the effect of nano-silica on the thermal energy storage efficiency during both charging and discharging processes. According to the Differential Scanning Calorimeter (DSC) thermal analysis, it was found that the system M02 whose nano-silica addition rate of 2 wt%, has the most favorable thermal characteristics (i.e., highest specific heat and lowest enthalpy change). Moreover, the addition of 2 wt% represents the optimum distribution of nano-silica inside the principal base system M00. This leads to an improvement in the porosity of the system due to the degree of homogeneity caused by the thermophoresis effect distribution, the high surface area of the nano-silica with the activity of the M00 matrix alongside the degree of the alkalinity of nano-silica. Besides, the electric conductivity measurements showed that the 2wt% percentage is the optimum one for thermal energy storage systems.
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Taha S, Osaili TM, Saddal NK, Al-Nabulsi AA, Ayyash MM, Obaid RS. Food safety knowledge among food handlers in food service establishments in United Arab Emirates. Food Control 2020. [DOI: 10.1016/j.foodcont.2019.106968] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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ALHAQAS G, Ahmed F, Taha S, Akl A, Abdullah S. SAT-027 CISPLATIN NEPHROTOXICITY IN A PATIENT WITH CERVICAL CANCER WITH ACQUIRED TYPE 2 RENAL TUBULAR ACIDOSIS: REVIEW OF LITERATURE AND CASE REPORT. Kidney Int Rep 2020. [DOI: 10.1016/j.ekir.2020.02.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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12
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Taha S, Wilkins S, Juusola K, Osaili TM. Food Safety Performance in Food Manufacturing Facilities: The Influence of Management Practices on Food Handler Commitment. J Food Prot 2020; 83:60-67. [PMID: 31841360 DOI: 10.4315/0362-028x.jfp-19-126] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The purpose of the study was to investigate the influence of management practices on food handler commitment and, ultimately, food safety performance in food manufacturing facilities. Two focus groups, one with six food handlers and the other with six food safety professionals, were used to develop a conceptual model that measured the effect of management practices on food handler commitment and organizational performance. The fitness of the structural model was measured via a survey with 945 respondents from 189 food manufacturing facilities and official food inspectors in the Emirate of Dubai, United Arab Emirates. The study found that training, communication, employee involvement, and organizational management support positively and significantly influenced employee commitment, and employee commitment positively and significantly influenced facilities' food safety performance. These results indicate food handler commitment is a critical factor in the relationship between all of the studied management practices and facilities' food safety performance. The study may have implications for food safety inspectors, enforcement officers, training agencies, and food manufacturing managements to consider human aspects in their work.
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Affiliation(s)
- Sadi Taha
- Faculty of Business and Law, The British University in Dubai, Dubai, United Arab Emirates.,Department of Hospitality Management, School of Business Administration, Al Dar University College, Dubai, United Arab Emirates
| | - Stephen Wilkins
- Faculty of Business and Law, The British University in Dubai, Dubai, United Arab Emirates
| | - Katariina Juusola
- Department of International Management, MODUL University Dubai, Dubai, United Arab Emirates
| | - Tareq M Osaili
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates and.,Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid 22110, Jordon
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Babai A, Elsayed L, Mohammed I, Elseed M, Hamed A, Alturabi E, Eltazi I, Taha S. Exploring the molecular basis of hereditary spinocerebellar degeneration in a large Sudanese family. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.1578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Taha S, Gabr A, El-Badawy S. Regression and Neural Network Models for California Bearing Ratio Prediction of Typical Granular Materials in Egypt. Arab J Sci Eng 2019. [DOI: 10.1007/s13369-019-03803-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ramia NE, El Kheir SM, Taha S, Mangavel C, Revol-Junelles AM, Borges F. Multilocus sequence typing of Carnobacterium maltaromaticum strains associated with fish disease and dairy products. J Appl Microbiol 2018; 126:377-387. [PMID: 30307684 DOI: 10.1111/jam.14127] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/18/2018] [Accepted: 09/28/2018] [Indexed: 01/15/2023]
Abstract
AIMS Carnobacterium maltaromaticum is a lactic acid bacterium of technological interest in the field of dairy ripening and food bioprotection and is generally recognized as safe in the United States. As it is associated with fish infections, the European Food Safety Agency did not include this species in the qualified presumption safety list of micro-organisms. This implies that the risk assessment for the species has to be performed at the strain level. METHODS AND RESULTS Multilocus sequence typing (MLST) is a tool that (i) potentially allows to discriminate strains isolated from diseased fish from apathogenic strains and (ii) to assess the genetic relatedness between both groups of strains. In this study, we characterized by MLST 21 C. maltaromaticum strains including 16 strains isolated from diseased fish and 5 apathogenic dairy strains isolated from cheese. The resulting population structure was investigated by integrating these new data to the previously published population structure (available at http://pubmlst.org), which represents an overall of 71 strains. CONCLUSIONS This analysis revealed that none of the strains isolated from diseased fish is assigned to a clonal complex containing cheese isolates, and that 11 strains exhibit singleton genotypes suggesting that the population of diseased fish isolates is not clonal. SIGNIFICANCE AND IMPACT OF THE STUDY This study thus provides a population structure of C. maltaromaticum that could serve in the future as a reference that could contribute to the risk assessment of C. maltaromaticum strains intended to be used in the food chain.
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Affiliation(s)
- N E Ramia
- Université de Lorraine, LIBio, Nancy, France.,Laboratoire de Biotechnologies Appliquées, EDST, Université Libanaise, Tripoli, Lebanon
| | - S M El Kheir
- Université de Lorraine, LIBio, Nancy, France.,Laboratoire de Biotechnologies Appliquées, EDST, Université Libanaise, Tripoli, Lebanon
| | - S Taha
- Laboratoire de Biotechnologies Appliquées, EDST, Université Libanaise, Tripoli, Lebanon
| | - C Mangavel
- Université de Lorraine, LIBio, Nancy, France
| | | | - F Borges
- Université de Lorraine, LIBio, Nancy, France
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Rabia M, Mohamed HSH, Shaban M, Taha S. Preparation of polyaniline/PbS core-shell nano/microcomposite and its application for photocatalytic H 2 electrogeneration from H 2O. Sci Rep 2018; 8:1107. [PMID: 29348558 PMCID: PMC5773669 DOI: 10.1038/s41598-018-19326-w] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 12/28/2017] [Indexed: 11/09/2022] Open
Abstract
Lead sulfide (PbS) and polyaniline (PANI) nano/microparticles were prepared. Then, PANI/PbS core-shell nano/microcomposites (I, II, and III) were prepared by oxidative polymerization of different aniline concentrations (0.01, 0.03, and 0.05 M), respectively, in the presence of 0.05 M PbS. FT-IR, XRD, SEM, HR-TEM, and UV-Vis analyses were carried out to characterize the samples. From the FT-IR data, there are redshifts in PbS and PANI nano/microparticles bands in comparison with PANI/PbS nano/microcomposites. The average crystallite sizes of PANI/PbS core-shell nano/microcomposites (I, II, and III) from XRD analyses were 46.5, 55, and 42.16 nm, respectively. From the optical analyses, nano/microcomposite (II) has the optimum optical properties with two band gaps values of 1.41 and 2.79 eV. Then, the nano/microcomposite (II) membrane electrode supported on ITO glass was prepared and applied on the photoelectrochemical (PEC) H2 generation from H2O. The characteristics current-voltage and current-time behaviors were measured at different wavelengths from 390 to 636 nm. Also, the incident photon-to-current conversion efficiency (IPCE) under monochromatic illumination condition was calculated. The optimum values for IPCE were 36.5 and 35.2% at 390 and 405 nm, respectively. Finally, a simple mechanism for PEC H2 generation from H2O using the nano/microcomposite (II) membrane electrode was mentioned.
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Affiliation(s)
- Mohamed Rabia
- Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62514, Egypt.,Polymer Research Laboratory, Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62514, Egypt
| | - H S H Mohamed
- Physics Department, Faculty of Science, Fayoum University, EL-Fayoum, Egypt
| | - Mohamed Shaban
- Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62514, Egypt.
| | - S Taha
- Physics Department, Faculty of Science, Fayoum University, EL-Fayoum, Egypt
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Taleb A, Kandilian R, Touchard R, Montalescot V, Rinaldi T, Taha S, Takache H, Marchal L, Legrand J, Pruvost J. Screening of freshwater and seawater microalgae strains in fully controlled photobioreactors for biodiesel production. Bioresour Technol 2016; 218:480-90. [PMID: 27394994 DOI: 10.1016/j.biortech.2016.06.086] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 06/21/2016] [Accepted: 06/22/2016] [Indexed: 05/18/2023]
Abstract
Strain selection is one of the primary hurdles facing cost-effective microalgal biodiesel production. Indeed, the strain used affects both upstream and downstream biodiesel production processes. This study presents a screening procedure that considers the most significant criteria in microalgal biodiesel production including TAG production and wet extraction and recovery of TAGs. Fourteen freshwater and seawater strains were investigated. Large variation was observed between the strains in all the screening criteria. The overall screening procedure ultimately led to the identification of Parachlorella kessleri UTEX2229 and Nannochloropsis gaditana CCMP527 as the best freshwater and seawater strains, respectively. They featured the largest areal TAG productivity equal to 2.7×10(-3) and 2.3×10(-3)kgm(-2)d(-1), respectively. These two strains also displayed encouraging cell fragility in a high pressure bead milling process with 69% and 98% cell disruption at 1750bar making them remarkable strains for TAG extraction in wet environment.
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Affiliation(s)
- A Taleb
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France; AZM Center for Biotechnology Research and Its Applications, Laboratory of Applied Biotechnology, Lebanese University, EDST, Tripoli, Lebanon; Department of Food Science and Technology, Faculty of Agricultural and Veterinary Medicine, Lebanese University, Dekweneh, Beirut, Lebanon
| | - R Kandilian
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - R Touchard
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - V Montalescot
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - T Rinaldi
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - S Taha
- AZM Center for Biotechnology Research and Its Applications, Laboratory of Applied Biotechnology, Lebanese University, EDST, Tripoli, Lebanon
| | - H Takache
- Department of Food Science and Technology, Faculty of Agricultural and Veterinary Medicine, Lebanese University, Dekweneh, Beirut, Lebanon
| | - L Marchal
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - J Legrand
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - J Pruvost
- GEPEA, Université de Nantes, CNRS UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France.
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Donnellan C, Al Banna M, Redha N, Al Sharoqi I, Al-Jishi A, Bakhiet M, Taha S, Abdulla F. Association Between Metacognition and Mood Symptoms Poststroke. J Geriatr Psychiatry Neurol 2016; 29:212-20. [PMID: 27056067 DOI: 10.1177/0891988716640374] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 02/10/2016] [Indexed: 12/20/2022]
Abstract
INTRODUCTION The link between metacognition and mood has been well established, particularly in other conditions with psychological comorbidity, however, there is no evidence regarding this association in the area of stroke. AIM The aim of this study was to examine the association between metacognition, based on the Self-Regulatory Executive Function model, and mood symptoms in the acute phase after stroke. METHODS One hundred thirty patients were recruited to a prospective stroke study in Bahrain, and n = 64 were assessed for mood and cognition. A neuropsychological battery of cognitive assessments included the following measures: the Mini-Mental State Examination, the Trail Making Test (A+B), and the Metacognition Questionnaire 30 (MCQ-30) for metacognition. The Hospital Anxiety and Depression Scale assessed mood symptoms, and stroke severity was measured using the National Institute of Health Stroke Severity Scale. RESULTS Total MCQ-30 scores were significantly associated with both anxiety (r = .47, P = .001) and depression (r = .54, P <. 0001). The MCQ-30 subscales' cognitive confidence, cognitive self-consciousness, and uncontrollability/danger were the specific factors to be associated with mood symptoms (P < .01). Global cognition (r =.32, P < .01), but not executive function, was significantly associated with depression only. Metacognition remained a statistically significant correlate with depression (β = .42, P < .0001) and anxiety (β = .51, P < .0001) after adjusting for education and global cognition. DISCUSSION Metacognition is a better determinant of mood symptoms after stroke, especially in regions where illiteracy levels are high in older populations, in comparison to executive function and global cognition.
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Affiliation(s)
- Claire Donnellan
- School of Medicine, Royal College of Surgeons in Ireland-Medical University of Bahrain, Busaiteen, Kingdom of Bahrain School of Postgraduate Studies, Royal College of Surgeons in Ireland-Medical University of Bahrain, Busaiteen, Kingdom of Bahrain School of Nursing and Midwifery, Trinity College Dublin, Dublin, Ireland
| | - M Al Banna
- School of Postgraduate Studies, Royal College of Surgeons in Ireland-Medical University of Bahrain, Busaiteen, Kingdom of Bahrain
| | - N Redha
- School of Postgraduate Studies, Royal College of Surgeons in Ireland-Medical University of Bahrain, Busaiteen, Kingdom of Bahrain
| | - I Al Sharoqi
- Department of Clinical Neurosciences, Salmaniya Medical Complex, Salmaniya, Kingdom of Bahrain
| | - A Al-Jishi
- Department of Clinical Neurosciences, Salmaniya Medical Complex, Salmaniya, Kingdom of Bahrain
| | - M Bakhiet
- Department of Molecular Medicine, Princess Al-Jawhara Center for Genetics and Inherited Diseases, Salmaniya Kingdom of Bahrain
| | - S Taha
- Department of Molecular Medicine, Princess Al-Jawhara Center for Genetics and Inherited Diseases, Salmaniya Kingdom of Bahrain
| | - F Abdulla
- Department of Clinical Neurosciences, Salmaniya Medical Complex, Salmaniya, Kingdom of Bahrain
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Taleb A, Pruvost J, Legrand J, Marec H, Le-Gouic B, Mirabella B, Legeret B, Bouvet S, Peltier G, Li-Beisson Y, Taha S, Takache H. Development and validation of a screening procedure of microalgae for biodiesel production: application to the genus of marine microalgae Nannochloropsis. Bioresour Technol 2015; 177:224-32. [PMID: 25496942 DOI: 10.1016/j.biortech.2014.11.068] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 11/14/2014] [Accepted: 11/15/2014] [Indexed: 05/21/2023]
Abstract
Nannochloropsis has emerged as a promising alga for biodiesel production. However, the genus consists of 6 species and hundreds of strains making strain selection a challenge. Furthermore, oil productivity is instrumental to economic viability of any algal strain for industrial production, which is dependent on growth rate and oil content. In most cases, these two parameters have been studied independently. Thus, the goal of this study is to provide a combined method for evaluating strain performance in specially designed photobioreactors together with an in-depth lipidomic analyses. The nine strains of Nannochloropsis tested showed considerable variations in productivity and lipidomics highlighting the importance of strain selection. Finally, Nannochloropsis gaditana CCMP527 and Nannochloropsis salina CCMP537 emerged as the two most promising strains, with an oil content of 37 and 27 dry wt% after 11-day nitrogen starvation, respectively, resulting in TAG productivity of 13×10(-3) and 18×10(-3) kg m(-3) d(-1), respectively.
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Affiliation(s)
- A Taleb
- GEPEA, Université de Nantes, CNRS, UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France; Department of Food Science and Technology, Faculty of Agricultural and Veterinary Medicine, Lebanese University, Dekwaneh, Beirut, Lebanon; AZM Center for Biotechnology Research and its Applications, Laboratory of Applied Biotechnology, Lebanese University, EDST, Tripoli, Lebanon
| | - J Pruvost
- GEPEA, Université de Nantes, CNRS, UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France.
| | - J Legrand
- GEPEA, Université de Nantes, CNRS, UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - H Marec
- GEPEA, Université de Nantes, CNRS, UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - B Le-Gouic
- GEPEA, Université de Nantes, CNRS, UMR6144, bd de l'Université, CRTT, BP 406, 44602 Saint-Nazaire Cedex, France
| | - B Mirabella
- CEA, IBEB, Lab Bioenerget Biotechnol Bacteries & Microalgues, Saint-Paul-lez-Durance, F-13108, France; CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France; Aix Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - B Legeret
- CEA, IBEB, Lab Bioenerget Biotechnol Bacteries & Microalgues, Saint-Paul-lez-Durance, F-13108, France; CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France; Aix Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - S Bouvet
- CEA, IBEB, Lab Bioenerget Biotechnol Bacteries & Microalgues, Saint-Paul-lez-Durance, F-13108, France; CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France; Aix Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - G Peltier
- CEA, IBEB, Lab Bioenerget Biotechnol Bacteries & Microalgues, Saint-Paul-lez-Durance, F-13108, France; CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France; Aix Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - Y Li-Beisson
- CEA, IBEB, Lab Bioenerget Biotechnol Bacteries & Microalgues, Saint-Paul-lez-Durance, F-13108, France; CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France; Aix Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - S Taha
- Department of Food Science and Technology, Faculty of Agricultural and Veterinary Medicine, Lebanese University, Dekwaneh, Beirut, Lebanon
| | - H Takache
- AZM Center for Biotechnology Research and its Applications, Laboratory of Applied Biotechnology, Lebanese University, EDST, Tripoli, Lebanon
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El-Kabbany F, Taha S, Hafez M. A study of the phase transition of reheated diphenyl carbazide (DPC) by using UV spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2014; 128:481-488. [PMID: 24682065 DOI: 10.1016/j.saa.2014.02.143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 02/18/2014] [Accepted: 02/21/2014] [Indexed: 06/03/2023]
Abstract
Phase transition phenomenon in reheated diphenyl carbazide (DPC) is studied here using UV spectroscopy. The optical band gap for reheated DPC is obtained by measuring the optical diffused reflectance (DR) and equals to 3.55 eV. Also, the optical band gap is calculated using UV technique and equals to 3.548 eV. The absorbance of reheated DPC is studied at some selected temperatures in order to check the presence of phase transitions at 90°C and 125°C. According to the present work, the band gaps are calculated at 80°C, 110°C and 130°C and equal to 3.548 eV. But at 100°C, the optical band gap has changed to 4.139 eV. It was found that each phase of reheated DPC belongs to a certain definite crystal structure. The presence of the phase transitions are checked and confirmed by scanning electron microscopy (SEM). The structural properties and morphology of reheated diphenyl carbazide are investigated by SEM. The SEM images are taken at some selected temperatures to confirm the presence of phase transitions.
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Affiliation(s)
- F El-Kabbany
- Physics Department, Faculty of Science, Cairo University, Cairo, Egypt
| | - S Taha
- Physics Department, Faculty of Science, El-Fayoum University, EL-Fayoum, Egypt; Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
| | - M Hafez
- Physics Department, Faculty of Science, Cairo University, Cairo, Egypt.
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Salama H, Abughalwa M, Taha S, Sharaf N, Mansour A. Transient tachypnea of the newborn: Is empiric antimicrobial therapy needed? J Neonatal Perinatal Med 2014; 6:237-41. [PMID: 24246596 DOI: 10.3233/npm-1367012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Transient tachypnea of the newborn (TTN) is a self- limited increase in the work of breathing in near- and full-term infants; it is attributed to a delay in the clearance of alveolar fluids. Prophylactic antibiotics are usually administered until blood cultures are reported negative for 48 hours. OBJECTIVES To prospectively compare outcomes of infants presented with classic TTN who were treated with or denied from intravenous antibiotics. METHODS A prospective cohort study was conducted on all infants admitted with classic TTN. Pre-set diagnostic criteria for classic TTN were applied in order to exclude other cases presenting with respiratory distress. Infants with classic TTN were stratified into two groups based on whether they received or did not receive antibiotics. The decision to administer antibiotics solely depended upon the style of the covering physician at the time of admission to the NICU. The following investigations were obtained from infants of both groups: blood culture, C-reactive protein, complete blood count, blood gas profile and chest X-ray. RESULTS A total of 15146 full-term infants were delivered during the study period; of them 923 were admitted to the NICU. Classic TTN was diagnosed in 168 infants; of them 106 (63%) received and 62 (37%) did not receive antibiotics. Two infants in the treated group and an infant in the non-treated group had microbiologically confirmed bacteremia. Infants in the treatment group stayed longer in the hospital (72 ± 6 vs. 48 ± 3 hrs). No recorded cases required readmission in either group. CONCLUSIONS With the application of strict criteria for classic TTN and the close observation in the NICU, the empiric use of antibiotics may be avoidable. Randomized controlled trials are needed to confirm the feasibility and safety of such approach.
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Affiliation(s)
- H Salama
- Division of Neonatology, Women's Hospital, Hamad Medical Corporation, Doha, Qatar
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Hafez M, Yahia IS, Taha S. Diffused reflectance and structure analysis for the nano-matrix (ZnO(1-x)SiO2(x)) system. Spectrochim Acta A Mol Biomol Spectrosc 2014; 127:521-529. [PMID: 24662721 DOI: 10.1016/j.saa.2014.02.094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Revised: 02/13/2014] [Accepted: 02/16/2014] [Indexed: 06/03/2023]
Abstract
Optical and structural properties of the investigated matrix ZnO(1-x)SiO2(x) system were characterized by various techniques such as X-ray analysis and UV-VIS-NIR absorption. The structural changes of the studied nano-matrix ZnO(1-x)SiO2(x) with the concentration of nanosilica are checked by X-ray analysis measurement. The crystal structures for ZnO, (ZnO)0.75(SiO2)0.25, (ZnO)0.50(SiO2)0.50 and (ZnO)0.25(SiO2)0.75 and pure SiO2 are hexagonal, monoclinic, tetragonal, orthorhombic and amorphous respectively and detailed crystal parameters are obtained. The electronic properties of ZnO(1-x)SiO2(x) are investigated, where the optical band gaps for the five studied systems are 3.22eV, 3.24eV, 3.27eV, 3.30eV and 4.5eV respectively. It is clear that the band gap increases with increasing SiO2 content. Mixing the ZnO with SiO2 enhance the UV response of these materials which is confirmed by diffused reflectance spectrum used to analyze the UV response of the studied systems.
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Affiliation(s)
- M Hafez
- Physics Department, Faculty of Science, Cairo University, Cairo, Egypt.
| | - I S Yahia
- Nano-Science & Semiconductor Labs, Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt; Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
| | - S Taha
- Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia; Physics Department, Faculty of Science, El-Fayoum University, EL-Fayoum, Egypt
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El-Kabbany F, Taha S, Hafez M. IR spectroscopic analysis of the new organic silver complex C13H13N4OAg. Spectrochim Acta A Mol Biomol Spectrosc 2013; 111:252-259. [PMID: 23659908 DOI: 10.1016/j.saa.2013.03.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 03/07/2013] [Accepted: 03/12/2013] [Indexed: 06/02/2023]
Abstract
IR analysis in the frequency range 400-4000 cm(-1) is used here to investigate the changes in different modes of thermally treated new metal complex (diphenyl carbazide silver complex DPCAg, C13H13N4OAg) during the glass transition at 91 °C and the high temperature phase transition at 167 °C. These two phase transitions in this new metal compound are studied here by detecting the changes in some IR spectroscopic parameters (e.g., mode shift, band contour, peak height and peak intensity) during the elevation of temperature. All of the vibrations of DPCAg were found to be due to ionic fundamentals 3311 cm(-1), 3097 cm(-1), 3052 cm(-1), 1677 cm(-1), 1602 cm(-1), 1492 cm(-1), 1306 cm(-1), 1252 cm(-1), 887 cm(-1) and 755 cm(-1). The results obtained can be considered as the first spectroscopic analysis of this new metal complex. These results strongly confirmed that the thermally treated DPCAg transverse a glass transition at 91 °C and a high temperature phase transition at 167 °C. Anomalous spectroscopic changes near the glass transition temperature Tg could be recorded. A temperature dependence of peak intensity of the two modes 810 cm(-1) and 3440 cm(-1) could be observed beyond Tg. Also, the high temperature phase modification at 167 °C showed anomalous change in the spectroscopic parameters before and after the phase transition process. A proposed silver position in the new silver complex DPCAg has been presented.
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Affiliation(s)
- F El-Kabbany
- Physics Dept., Faculty of Science, Cairo University, Egypt
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El-Kabbany F, Taha S, Hafez M. IR spectroscopic analysis of polymorphism in C13H14N4O. Spectrochim Acta A Mol Biomol Spectrosc 2011; 78:981-988. [PMID: 21236726 DOI: 10.1016/j.saa.2010.12.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2010] [Revised: 11/29/2010] [Accepted: 12/08/2010] [Indexed: 05/30/2023]
Abstract
IR analysis is used here to investigate the changes in N-N, N-H, CO modes of thermally treated diphenyl carbazide (DPC) during the variation of temperature from room temperature up to ≈160°C. Polymorphism in DPC compound has been studied here by detecting the changes in some IR spectroscopic parameters (e.g., mode shift, band contour) during the elevation of temperature. Also, DSC, X-ray, NMR and atomic mass spectra are used as confirming tools for what is obtained by IR. All of the vibrations of DPC were found to be due to ionic fundamentals 3311 cm(-1), 3097 cm(-1), 3052 cm(-1), 1677 cm(-1), 1602 cm(-1), 1492 cm(-1), 1306 cm(-1), 1252 cm(-1), 887 cm(-1) and 755 cm(-1). The results revealed for the first time that the thermally treated DPC traverse four different phase transformations at 50°C, 90°C, 125°C and 140°C. The crystal structure was found to be amorphous, monoclinic, tetragonal, orthorhombic and amorphous within a temperature range (30°C-160°C). X-ray diffraction patterns support the results obtained by IR and DSC.
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Affiliation(s)
- F El-Kabbany
- Physics Department, Faculty of Science, Cairo University, Cairo, Egypt
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Taha S, El-Khatib M, Siddik-Sayyid S. Correspondence: A reply. Anaesthesia 2010. [DOI: 10.1111/j.1365-2044.2010.06468.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Bakhiet M, Taha S. A novel nervous-to-immune signalling mechanism mediating innate responses to infections. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.1904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Taha S, Doe K, Compeyre S, Nogues L, Lopes M, Leriche B. [Intraorbital dermoid cyst: case report]. Neurochirurgie 2009; 55:577-80. [PMID: 19368946 DOI: 10.1016/j.neuchi.2008.12.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Accepted: 12/08/2008] [Indexed: 10/20/2022]
Abstract
Dermoid cysts account for 3-4 % of primary orbital tumors. The intraorbital location is relatively rare. The authors report a case of a 12-year-old male with an intraorbital dermoid cyst revealed by progressive right proptosis. The imaging aspects (CT scan and MRI) were consistent with intraconic dermoid cyst. The tumor was extirpated via a subfrontal approach. Histopathologic examination confirmed the diagnosis of dermoid cyst. The authors discuss the clinical symptoms, radiological aspects, and management.
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Affiliation(s)
- S Taha
- Service de neurochirurgie, centre hospitalier régional de la Réunion, BP 350, 97448 Saint-Pierre cedex, Réunion.
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Bakhiet M, Al-Zaki A, Taha S. A Role for Chlamydia pneumoniae in Inducing IL-10, IL-13, IL-18 and the Chemokines CCL3-alpha, CCL3-beta and CCL5 in Atherosclerotic Patients. Int J Infect Dis 2008. [DOI: 10.1016/j.ijid.2008.05.511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Doe K, Lopes M, Taha S, Leriche B, Nogues L. [Neurosurgical management of paraplegia complicating Pott's disease: a six-case study]. Neurochirurgie 2008; 55:63-9. [PMID: 18701119 DOI: 10.1016/j.neuchi.2008.06.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2007] [Accepted: 06/21/2008] [Indexed: 10/21/2022]
Abstract
Tuberculosis is a rare disease in economically developed countries. Paraplegia is one of its severe complications, occurring in cases of spondylodiscitis with compressive epiduritis and/or pathological fracture of vertebral bodies with subacute kyphosis. Six patients aged 15-75 years were treated in our department from May 2005 to April 2006 by the same operator (L.N.) for paraplegia complicating Pott's disease. Patients' neurologic function at admission and their outcomes three and 12 months after surgery were graded using the Frankel classification. MRI showed a single lesion in five cases and skip lesions in one case. Standard antituberculosis chemotherapy was started immediately within the first week of admission in five patients following a 12-month regimen. Principles of surgical treatment were ventral spinal cord decompression (with or without dorsal stage procedure), immediate grafting, correction of subacute spinal deformity and instrumentation in all cases. The diagnosis of Mycobacterium tuberculosis was confirmed by laboratory investigations in four cases and by histopathological examination in all cases. One patient who had undergone prior isolated laminectomy performed by an on call team presented neurological deterioration and progressive kyphosis. Neurological outcome improved in five patients. Four of them were able to walk unaided within the first three months after surgery. No perioperative complication occurred. In paraplegia complicating vertebral tuberculosis, overall neurological outcome appeared to be good in case of delayed emergency surgical management combined with antituberculosis chemotherapy.
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Affiliation(s)
- K Doe
- Service de neurochirurgie, CHR de La-Réunion, avenue du Président-Mitterrand, BP 350, 97448 Saint-Pierre, France.
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Nauphal M, El-Khatib M, Taha S, Haroun-Bizri S, Alameddine M, Baraka A. Effect of alpha-stat vs. pH-stat strategies on cerebral oximetry during moderate hypothermic cardiopulmonary bypass. Eur J Anaesthesiol 2006; 24:15-9. [PMID: 16824241 DOI: 10.1017/s0265021506000998] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2006] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND OBJECTIVES This study was undertaken to compare the effect of alpha-stat vs. pH-stat strategies for acid-base management on regional cerebral oxygen saturation (RsO2) in patients undergoing moderate hypothermic haemodilution cardiopulmonary bypass (CPB). METHODS In 14 adult patients undergoing elective coronary artery bypass grafting, an awake RsO2 baseline value was monitored using a cerebral oximeter (INVOS 5100). Cerebral oximetry was then monitored continuously following anaesthesia and during the whole period of CPB. Mean +/- SD of RsO2, CO2, mean arterial pressure and haematocrit were determined before bypass and during the moderate hypothermic phase of the CPB using the alpha-stat followed by pH-stat strategies of acid-base management. Alpha-stat was then maintained throughout the whole period of CPB. RESULTS The mean baseline RsO2 in the awake patient breathing room air was 59.6 +/- 5.3%. Following anaesthesia and ventilation with 100% oxygen, RsO2 increased up to 75.9 +/- 6.7%. Going on bypass, RsO2 significantly decreased from a pre-bypass value of 75.9 +/- 6.7% to 62.9 +/- 6.3% during the initial phase of alpha-stat strategy. Shifting to pH-stat strategy resulted in a significant increase of RsO2 from 62.9 +/- 6.3% to 72.1 +/- 6.6%. Resuming the alpha-stat strategy resulted in a significant decrease of RsO2 to 62.9 +/- 7.8% which was similar to the RsO2 value during the initial phase of alpha-stat. CONCLUSION During moderate hypothermic haemodilutional CPB, the RsO2 was significantly higher during the pH-stat than during the alpha-stat strategy. However, the RsO2 during pH-stat management was significantly higher than the baseline RsO2 value in the awake patient breathing room air, denoting luxury cerebral perfusion. In contrast, the RsO2 during alpha-stat was only slightly higher than the baseline RsO2, suggesting that the alpha-stat strategy avoids luxury perfusion, but can maintain adequate cerebral oxygen supply-demand balance during moderate hypothermic haemodilutional CPB.
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Affiliation(s)
- M Nauphal
- American University of Beirut, Department of Anesthesiology, Beirut, Lebanon
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Ansari N, Abdulla J, Zayyani N, Brahmi U, Taha S, Satir AA. Comparison of RANTES expression in Crohn's disease and ulcerative colitis: an aid in the differential diagnosis? J Clin Pathol 2006; 59:1066-72. [PMID: 16565224 PMCID: PMC1861766 DOI: 10.1136/jcp.2005.034983] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND RANTES (regulated on activation, normal T cell expressed and secreted) expression is increased in inflammatory bowel disease (IBD). RANTES is produced at higher levels in granulomatous conditions, so increased RANTES expression can be expected in Crohn's disease compared with ulcerative colitis. AIM To compare RANTES expression between intestinal biopsy specimens of patients with Crohn's disease and those with ulcerative colitis. MATERIALS AND METHODS A prospective study of patients presenting with lower gastrointestinal symptoms at the Bahrain Specialist Hospital from July 2004 to April 2005 was carried out. Endoscopic colonic biopsy specimens were taken from every patient and subjected to (a) routine haematoxylin and eosin staining examination by light microscopy, (b) immunohistochemistry for examination of RANTES protein expression by light microscopy and (c) in situ hybridisation for examination of RANTES mRNA expression by light microscopy. RANTES expression was assessed and quantified. RESULTS 58 patients were enrolled to the study. Of them, 40 had IBD (21 had Crohn's disease and 19 had ulcerative colitis), 15 were controls with normal colonic biopsy results or non-inflammatory lesions and 3 had colonic inflammatory lesions other than IBD. RANTES expression in lymphocytes or histiocytes was significantly higher (p = 0.04) in new patients with ulcerative colitis than in those with Crohn's disease analysed by immunohistochemistry (IHC). CONCLUSION RANTES expression in lymphocytes or histiocytes is significantly higher in patients with ulcerative colitis than in those with Crohn's disease. Hence, RANTES IHC can be an effective method for distinguishing between biopsy specimens of patients with ulcerative colitis from those of patients with Crohn's disease, where routine histological features are indeterminate. RANTES IHC may prove to be a useful technique for identifying early or equivocal granulomas.
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Affiliation(s)
- N Ansari
- Department of Pathology, Arabian Gulf University, Bahrain.
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Benbrahim S, Taha S, Cabon J, Dorange G. Élimination des cations métalliques divalents : complexation par l'alginate de sodium et ultrafiltration. ACTA ACUST UNITED AC 2005. [DOI: 10.7202/705318ar] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Depuis quelques années la pollution par les métaux lourds et devenue un problème important pour la protection de l'environnement et de nombreuses méthodes ont été développées pour éliminer les métaux toxiques présents dans l'eau.
Parmi les différents procédés utilisés, la complexation-ultrafiltration est bien connue et de nombreuses études sur ce sujet sont décrites dans la littérature. Cependant, le choix de nouveaux macroligands hydrosolubles demeure important pour développer cette technologie.
L'un des objectifs de ce travail était de montrer que dans ce procédé un biopolymère peut remplacer un macroligand de synthèse. Les expériences ont été menées avec de l'alginate de sodium, polysaccharide extrait des algues brunes, et porteur de groupements carboxyliques et hydroxydes capables de complexer les cations.
Notre étude se divise en trois parties. Après avoir décrit, dans la première, le matériau et les méthodes utilisées, nous étudions dans la seconde les conditions de l'ultrafiltration (seuil de coupure, pression appliquée, pH, concentration ), avant de discuter dans la troisième les résultats obtenus dans le traitement de solutions contenant Cd2+, Cu2+, Mn2+ and Pb2+.
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Robert H, Casillas JM, Iskandar M, D'Athis P, Antoine D, Taha S, Didier V, Scaglioni G, Caillaux BX, Van Hoecke J. [The Dijon Physical Activity Score: reproducibility and correlation with exercise testing in healthy elderly subjects]. Ann Readapt Med Phys 2004; 47:546-54. [PMID: 15465159 DOI: 10.1016/j.annrmp.2004.03.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/04/2003] [Accepted: 03/30/2004] [Indexed: 11/30/2022]
Abstract
PURPOSE To validate a French physical activity score for current use in healthy elderly people. PATIENTS AND METHODS A brief questionnaire was developed for healthy elderly subjects older than 72 years. Questions asked about self-assessed physical fitness (1), daily activity (2), leisure and sport activity (5) and rest time (1). Correlations were searched between the score and several parameters of physical fitness: maximal exercise stress test (peak VO(2)), six-minute walk test, 200-meter long walk test, timed up an go test. RESULTS A total of 57 subjects were studied (mean age, 77.6 +/-3.6 years; 28 females and 29 males). The mean time to complete the questionnaire was 3.96 minutes. Reproducibility was 0.606, as determined by Spearman's coefficient. Correlations were found between the physical activity score and peak VO(2) (0.302, P <0.05) and peak power (0.257, P <0.10). CONCLUSIONS This easily obtained physical activity score provides a new way to assess physical activity in active elderly subjects. The physical score correlated in part with maximal ability but must be validated in several diseases.
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Affiliation(s)
- H Robert
- Inserm, ERITm 0207, pôle de rééducation-réadaptation, CHU de Dijon, 23, rue Gaffarel, 21079 Dijon cedex, France
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Paugam L, Taha S, Dorange G, Jaouen P, Quéméneur F. Mechanism of nitrate ions transfer in nanofiltration depending on pressure, pH, concentration and medium composition. J Memb Sci 2004. [DOI: 10.1016/j.memsci.2003.11.003] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Diaz A, Porhiel V, Sabatier P, Taha S, Ragragui O, Comoy J, Leriche B. [Tophaceous gout of the cervical spine, causing cord compression. Case report and review of the literature]. Neurochirurgie 2003; 49:600-4. [PMID: 14735005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
We present the case of a 74-year-old patient with long-standing gout who developed C4-C5 tophaceous gout causing cord compression. The patient had undergone 4 years earlier for a disco-osteophytic cord compression (anterior C4-C5 and C5-C6 discectomy). When admitted, the patient presented quadriparesia which had developed during the previous week in association with acute tophaceous gout on the knees, and the metarsophalangeal articulations, in the context of a bronchial infection. The diagnosis of spondylodiscitis was initially retained because of the clinical features of severe infection and the radiological data (C4-C5 cord compression, with anterior epidural lesions in MRI). The intervention allowed decompression and pathological diagnosis of tophaceous gout. Spinal gout is well-known, and very rarely responsible for cord compression: only 15 cases of cervical gout have been described in the literature. Radiological findings are not specific, and treatment is surgical in the event of medullar compression despite medical treatment.
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Affiliation(s)
- A Diaz
- Service de Neurochirurgie, CH Sud-Réunion, 97448 Saint-Pierre Cedex.
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Doe KK, Diaz A, Taha S, Lerich B, Lapierre F. [Cervical medullary metastasis in a patient with Von Hippel-Lindau disease]. Neurochirurgie 2003; 49:536-9. [PMID: 14646819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
Von Hippel-Lindau disease is an autosomal dominant disorder mainly characterized by hemangioblastoma(s) associated with kidney clear-cell carcinoma. Hemangioblastoma represents 2 to 3% of all central nervous system tumors whereas extramedullary metastasis accounts for 30 to 50% of all intravertebral column tumors. The most common sites of metastatic dissemination in order of frequency are the lung, breast, prostate and kidney. We report a case of an unusual cervical intradural extramedullary metastasis of clear-cell kidney carcinoma associated with a cervical spinal cord hemangioblastoma in a 45-year-old patient with Von Hippel-Lindau disease who had developed retinal hemangioblastomas 20 years earlier. A review of the relevant literature is proposed.
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Affiliation(s)
- K K Doe
- Service de Neurochirurgie, CHU La Milétrie, 350, avenue Jacques-Coeur, 86021 Poitiers.
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Garba Y, Taha S, Cabon J, Dorange G. Modeling of cadmium salts rejection through a nanofiltration membrane: relationships between solute concentration and transport parameters. J Memb Sci 2003. [DOI: 10.1016/s0376-7388(02)00328-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Simon A, Penpenic L, Gondrexon N, Taha S, Dorange G. A comparative study between classical stirred and ultrasonically-assisted dead-end ultrafiltration. Ultrason Sonochem 2000; 7:183-186. [PMID: 11062873 DOI: 10.1016/s1350-4177(00)00039-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The aim of this work was to determine mass transfer coefficients in the cases of ultrasonically-assisted and classical stirred dead-end ultrafiltration. A comparative study was then performed, and mass transfer coefficients obtained under ultrasonic conditions are described by an empirical model. This correlation results from an analogy with what is observed using a stirred cell and involves the ultrasonic power as the main parameter. The hydrodynamics are assumed to depend on the intensity of the ultrasound effects illustrated by the agitation arising within the cell. This agitation is due to convective currents as well as physical effects due to cavitation. The concentration polarization phenomenon is therefore affected by this action of ultrasonic waves.
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Affiliation(s)
- A Simon
- ENSCR, Laboratoire de Chimie des Eaux et de l'Environnement, Rennes, France.
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Baraka A, Siddik S, el Rassi T, Taha S, Haroun-Bizri S. Sevoflurane anesthesia in a myasthenic patient undergoing transsternal thymectomy. Middle East J Anaesthesiol 2000; 15:603-9. [PMID: 11330215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Myasthenia gravis (MG) is an autoimmune disease resulting from the production of antibodies against the acetylcholine receptors of the neuromuscular synapse. The thymus gland is involved in the autosensitization process, and there is a consensus that all adults with generalized MG should have a thymectomy. Removal of a much thymic tissue as possible via the transsternal approach in the logic goal of thymectomy in the treatment of MG. Because of the unpredictable response to succinylcholine and the marked sensitivity to nondepolarizing muscle relaxants in the MG patients, some anesthesiologists avoid the use of muscle relaxants in the myasthenic patients, and depend on deep inhalation anesthesia, such as halothane, isoflurane or sevoflurane. In the present report, we used sevoflurane 4%, without supplementation by muscle relaxants, for the induction and maintenance of anesthesia in a MG patient undergoing transsternal thymectomy. The report reviews the anesthetic technique, and describes the electromyographic (EMG) changes following sevoflurane.
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Affiliation(s)
- A Baraka
- Department of Anesthesiology, American University of Beirut, P.O. Box: 113-6044, Beirut, Lebanon.
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Taha S, Segnarbieux F, Diaz A, Compeyre S, Nouges L. [Aneurysm of the postero-inferior cerebellar artery associated with arteriovenous malformation]. Neurochirurgie 2000; 46:398-400. [PMID: 11015680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
A saccular aneurysm of the posterior inferior cerebellar artery lying in the fourth ventricle and an arteriovenous malformation in the cerebellum fed by the same artery are reported. Clipping of the neck of the aneurysm and total removal of the arteriovenous malformation were performed successfully during one stage. Review of the pertinent literature indicates that the aneurysm of the posterior inferior cerebellar artery originates from the peripheral portion of the artery when associated with arteriovenous malformation. The treatment is often surgical with good results in more than 80% of cases. A one-stage operation is the method of choice. Embolization is not without risk and can be attempted when the PICA's course allows easy catheterization.
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Affiliation(s)
- S Taha
- Service de Neurochirurgie, Centre Hospitalier Sud-Réunion, BP 350 57448 Saint-Pierre Cedex, Ile de la Réunion
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Baraka A, Lteif A, Nawfal M, Taha S, Maroun M, Khoury S, Jalbout M. Ambient pressure oxygenation via the nonventilated lung during video-assisted thoracoscopy. Anaesthesia 2000; 55:602-3. [PMID: 10866743 DOI: 10.1046/j.1365-2044.2000.01479-20.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Diaz A, Taha S, Vinikoff L, Allaoui M, Comoy J, Leriche B. [Dermoid cyst of the lateral ventricle associated with ethmoidal dermal sinus. Report of a case]. Neurochirurgie 2000; 46:39-42. [PMID: 10790642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
We report a case of a ventricular dermoid cyst associated with a dermal sinus connected with the ethmoidal cells in a patient who developed rapid symptoms of raised intracranial pressure. Computed tomography showed a cystic mass in the right lateral ventricle with a hydrolipidic image in the left frontal horn of the ventricle and associated hydrocephalus. Magnetic resonance imaging showed a heterogeneous T1 hyperintense mass with a fistulous tract communicating with the ethmoid cells. A cerebrospinal fluid ventriculo-peritoneal shunt was initially established, which required further revision. A right sided transventricular approach was undertaken in a second stage, allowing resection of a dermoid cyst. Obliteration of the dermal sinus tract was obtained using pericranial duraplasty. Clinical and imaging features are discussed. The need for total resection including the tumor capsule and occlusion of the fistula are emphasized if recurrence and infection are to be prevented.
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Affiliation(s)
- A Diaz
- Service de Neurochirurgie. CH Sud Réunion, 97448 Saint-Pierre Cedex
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Baraka A, Aouad M, Taha S, El-Khatib M, Kawkabani N, Soueidi A. Apnea-induced hemoglobin desaturation during one-lung vs two-lung ventilation. Can J Anaesth 2000; 47:58-61. [PMID: 10626721 DOI: 10.1007/bf03020734] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
PURPOSE To compare the rate of apnea-induced hemoglobin desaturation during one-lung ventilation (OLV) vs. two-lung ventilation (TLV) in patients undergoing thoracic surgery. METHODS Six patients undergoing thoracotomy or thoracoscopy were included. Each patient served as his/her own control. The lungs were ventilated with oxygen 100% using TLV, followed after 20-30 min by OLV and the resultant PaO2 was measured. Apnea was then induced following the two techniques of ventilation, and the times for every 1% decrease in hemoglobin saturation from 100% to 95%, as monitored by pulse oximetry, were recorded. The times for every 1% decrease in the saturation were compared in the two groups. RESULTS The mean PaO2 value following TLV (445+/-99 mm Hg) was higher than the mean PaO2 following OLV (156+/-18 mm Hg). Also, the mean time for subsequent apnea induced hemoglobin desaturation from SpO2 100% to 95% following TLV was twice the time of desaturation following OLV (6.3+/-1.2 min vs. 3.2+/-0.5 min, P<0.05). CONCLUSION Hemoglobin desaturation occurs more rapidly during apnea following OLV than TLV. The rapid desaturation may be attributed to the decrease of FRC, associated with an increased transpulmonary shunting. The results suggest that two-lung ventilation with oxygen 100% provides a greater safety margin than one-lung ventilation with oxygen 100% whenever ventilation is interrupted.
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Affiliation(s)
- A Baraka
- Department of Anesthesiology, American University of Beirut, Lebanon.
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Taha S, Diaz A, Compeyre S, Cabal P, Comoy J, Leriche B. [Krouamania causing an acute subdural hematoma of arterial origin]. Rev Neurol (Paris) 1999; 155:1079-81. [PMID: 10637929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
We report a case of arteriolar subdural hematoma caused by Jedba assimilated to Krouamania. We discuss the pathophysiological mechanism of subdural bleeding, the clinical symptoms, the characteristics of such hematomas and the therapeutical management.
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Affiliation(s)
- S Taha
- Service de Neurochirurgie, Centre Hospitalier Sud-Réunion, Saint-Pierre
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Abstract
Elevated plasma levels of homocysteine have been identified as an important and independent risk factor for cerebral, coronary, and peripheral atherosclerosis, although the mechanisms are unclear. Homocysteine has been shown to promote cell proliferation and induction of the gene transcription factor c-fos in vascular smooth muscle cells. Earlier reports have suggested that homocysteine exert its effect via hydrogen peroxide (H2O2) produced during its metabolism. To evaluate the contribution of homocysteine to the pathogenesis of vascular diseases, we examined whether the effect of homocysteine on vascular smooth muscle cell growth is mediated by H2O2. We observed that 1.0 mM homocysteine induces DNA synthesis by 1.5-fold and proliferation of vascular smooth muscle cells two-fold in the presence of peroxide scavenging enzyme, catalase (2,600 U/ml). Our results suggest that homocysteine induces smooth muscle cell growth by an H2O2-independent pathway and that the effects of homocysteine may sum together with the known initiating events produced by oxidative stress and accelerate the progression of atherosclerosis.
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Affiliation(s)
- S Taha
- Department of Biochemistry, Faculty of Medicine, Marmara University, Istanbul, Turkey
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Taha S, Diaz A, Vinikoff L, Compeyre S, Amat C, Leriche B. [Intra-orbital dacryops. Report of a case]. Neurochirurgie 1998; 44:278-82. [PMID: 9864701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
We report a case of intra-orbital Dacryops in a 7-year-old child. The presenting sign was progressive exophtalmus. The patient was operated via a lateral approach allowing total removal of the cyst without recurrence after one year. The clinical, radiological (CT Scan and MRI) and therapeutical aspects are discussed.
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Affiliation(s)
- S Taha
- Service de Neurochirurgie, Centre Hospitalier Sud-Réunion, Saint-Pierre, Ile de la Réunion
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