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Ismail SA, El-Hawary NS, Hassan AA, El-Sayed H. Non-deteriorative eco-friendly water-saving tactic for removal of vegetable matters from wool fleece using xylanase and cellulase. Int J Biol Macromol 2023; 253:126648. [PMID: 37673140 DOI: 10.1016/j.ijbiomac.2023.126648] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/25/2023] [Accepted: 08/30/2023] [Indexed: 09/08/2023]
Abstract
The carbonization of wool fleece (WF) is conducted to remove the adhered vegetable matter (VM) from contaminated WF using sulfuric acid, followed by drying and backing. This process has a deteriorative effect on WF and requires a tremendous quantity of water for rinsing WF after carbonization to remove any H2SO4 residuals. Herein, we propose an alternative eco-friendly water-saving process for the removal of VM from WF using enzymes. Cellulase-containing xylanase from the fungus Aspergillus terreus, and cellulase-free xylanase from the fungus Aspergillus flavus AW1 were used to remove the VM from WF. The effect of some process parameters on the amount of the removed VM was assessed. Alkali solubility as well as sulfur and cystine content were used to follow the alteration in the chemistry of the bio-treated WF. The fiber morphology was examined using scanning electron microscopy. The dyeability of the treated WF towards acid, reactive, and basic dyes was monitored. The results revealed that the removal of the VM from WF by applying the examined enzymes was effective and could be an appropriate, non-destructive, eco-friendly water-saving substitute to the conventional carbonization procedures. By virtue of enzyme specificity, the proposed process removed the VM without deteriorating the fiber.
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Affiliation(s)
- Shaymaa A Ismail
- Department of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Research Institute, National Research Centre, El Bohouth St., Dokki, Giza 12622, Egypt
| | - Nancy S El-Hawary
- Dyeing, Printing, and Textile Auxiliaries Department, Textile Research and Technology Institute, National Research Centre, El Bohouth Street, Dokki, Giza 12622, Egypt
| | - Amira A Hassan
- Department of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Research Institute, National Research Centre, El Bohouth St., Dokki, Giza 12622, Egypt
| | - Hosam El-Sayed
- Proteinic and Man-made Fibers Department, Textile Research and Technology Institute, National Research Centre, El Bohouth Street, Dokki, Giza 12622, Egypt.
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Shalaby ES, Aboutaleb S, Ismail SA, Yassen NN, Sedik AA. Chitosan tamarind-based nanoparticles as a promising approach for topical application of curcumin intended for burn healing: in vitro and in vivo study. J Drug Target 2023; 31:1081-1097. [PMID: 37886815 DOI: 10.1080/1061186x.2023.2276662] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 10/21/2023] [Indexed: 10/28/2023]
Abstract
One of the most prevalent worldwide problems that affect all ages and genders is skin burn. The goal of our study was to assess the ability of curcumin nanoparticles to cure a rat burn model. Three formulations were selected after several tests were performed including investigation of encapsulation efficiency, particle size and zeta potential measurements. In vitro release was achieved on the three selected formulations. The effectiveness of the chosen formulation for healing was evaluated. The induced burn wound was smeared, starting just after excision, once daily with curcumin nanoparticles for 18 days. Our findings revealed that curcumin nanoparticles improved the burn healing potential by augmenting the skin regeneration indices as evidenced by enhancing the new production of hyaluronic acid and collagen type I. Additionally, curcumin nanoparticles could increase levels of vascular endothelial growth factor and alpha smooth muscle activity while drastically reducing the skin's tumour necrosis factor content, revealing a significant potential for burn healing process that is also reflected in the histopathological and immunohistochemical studies. Finally, our results demonstrated that curcumin nanoparticles revealed a significant potential for burn healing than curcumin alone due to its potent antimicrobial, antioxidant and anti-inflammatory properties.
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Affiliation(s)
- Eman S Shalaby
- Pharmaceutical Technology Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Cairo, Egypt
| | - Sally Aboutaleb
- Pharmaceutical Technology Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Cairo, Egypt
| | - Shaymaa A Ismail
- Department of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Cairo, Egypt
| | - Noha N Yassen
- Pathology Department, National Research Centre, Cairo, Egypt
| | - Ahmed A Sedik
- Pharmacology Department, Medical Research and Clinical Studies Institute, National Research Centre, Cairo, Egypt
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Ismail SA, Abou Taleb M, Emran MA, Mowafi S, Hashem AM, El-Sayed H. Benign Felt-proofing of Wool Fibers Using a Keratinolytic Thermophilic Alkaline Protease. Journal of Natural Fibers 2022; 19:3697-3709. [DOI: 10.1080/15440478.2020.1848721] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Affiliation(s)
- Shaymaa A. Ismail
- Department of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
| | - Marwa Abou Taleb
- Proteinic and Man-made Fibres Department, Textile Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
| | - Mohamed A. Emran
- Department of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
| | - Salwa Mowafi
- Proteinic and Man-made Fibres Department, Textile Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
| | - Amal M. Hashem
- Department of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
| | - Hosam El-Sayed
- Proteinic and Man-made Fibres Department, Textile Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
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Hassan AA, Ismail SA. Production of antifungal N-acetyl-β-glucosaminidase chitinolytic enzyme using shrimp byproducts. Biocatalysis and Agricultural Biotechnology 2021. [DOI: 10.1016/j.bcab.2021.102027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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A. Ismail S, A. Emran M. Direct microbial production of prebiotic and antioxidant chitin-oligosaccharides from shrimp byproducts. Egypt J of Aquatic Biolo and Fish 2020; 24:181-195. [DOI: 10.21608/ejabf.2020.98021] [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] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Ismail SA, El-Sayed HS, Fayed B. Production of prebiotic chitooligosaccharide and its nano/microencapsulation for the production of functional yoghurt. Carbohydr Polym 2020; 234:115941. [DOI: 10.1016/j.carbpol.2020.115941] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/30/2020] [Accepted: 01/30/2020] [Indexed: 12/24/2022]
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Ismail SA, Hassan AA, Emran MA. Economic production of thermo-active endo β-mannanase for the removal of food stain and production of antioxidant manno-oligosaccharides. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2019.101387] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Ismail SA, Hassan ME, Hashem AM. Single step hydrolysis of chitin using thermophilic immobilized exochitinase on carrageenan-guar gum gel beads. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2019.101281] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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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Ismail SA. Microbial valorization of shrimp byproducts via the production of thermostable chitosanase and antioxidant chitooligosaccharides. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2019.101269] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Omar H, El Akel W, Elbaz T, El Kassas M, Elsaeed K, El Shazly H, Said M, Yousif M, Gomaa AA, Nasr A, AbdAllah M, Korany M, Ismail SA, Shaker MK, Doss W, Esmat G, Waked I, El Shazly Y. Generic daclatasvir plus sofosbuvir, with or without ribavirin, in treatment of chronic hepatitis C: real-world results from 18 378 patients in Egypt. Aliment Pharmacol Ther 2018; 47:421-431. [PMID: 29193226 DOI: 10.1111/apt.14428] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [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] [Received: 07/26/2017] [Revised: 08/22/2017] [Accepted: 10/30/2017] [Indexed: 12/19/2022]
Abstract
BACKGROUND Treatment of chronic hepatitis C using combination of sofosbuvir (SOF) and daclatasvir (DCV) was used in several clinical trials and multicentre studies, which were somewhat limited to genotypes 1-3. The national program in Egypt is using SOF-DCV combination for large scale treatment. AIM To assess the efficacy and safety of combined SOF-DCV in treating patients with HCV-G4 in a real-world setting. METHODS Data and outcome of chronic HCV patients who were treated for 12 weeks with generic medications: DCV 60 mg plus SOF 400 mg ± ribavirin (RBV) within the national hepatitis C treatment program in Egypt are presented. Treatment-naïve patients without cirrhosis were treated without RBV, and those who had cirrhosis or were treatment-experienced (interferon experienced or SOF experienced) received RBV. Efficacy and safety were assessed, and baseline factors associated with sustained virological response at post-treatment week 12 (SVR12) were explored. RESULTS During the first 2 months of the programme, 18 378 patients with HCV-G4 started treatment with SOF-DCV with or without RBV. Overall, 95.1% achieved SVR12 (95.4% among patients treated without RBV and 94.7% for patients treated with RBV, P = .32). Treatment was prematurely discontinued in only 1.5% of patients. The most common events leading to discontinuation were patient withdrawal (n = 76) and pregnancy (n = 5). Five deaths occurred within this group. CONCLUSIONS Real-world experience of generic SOF-DCV in patients with chronic HCV-G4 proved to be safe and associated with a high SVR12 rate, in patients with different stages of fibrosis.
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Affiliation(s)
- H Omar
- Faculty of Medicine, Cairo University, Cairo, Egypt
| | - W El Akel
- Faculty of Medicine, Cairo University, Cairo, Egypt
| | - T Elbaz
- Faculty of Medicine, Cairo University, Cairo, Egypt
| | - M El Kassas
- Faculty of Medicine, Helwan University, Cairo, Egypt
| | - K Elsaeed
- Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - H El Shazly
- National Liver Institute, Menoufiya University, Shebeen EL Kom, Egypt
| | - M Said
- Faculty of Medicine, Cairo University, Cairo, Egypt
| | - M Yousif
- Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - A A Gomaa
- Faculty of Medicine, Fayoum University, Fayoum, Egypt
| | - A Nasr
- Faculty of Medicine, Assiut University, Assiut, Egypt
| | | | - M Korany
- National Committee for Control of Viral Hepatitis, Cairo, Egypt
| | - S A Ismail
- National Hepatology and Tropical Medicine Research Institute, Cairo, Egypt
| | - M K Shaker
- Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - W Doss
- Faculty of Medicine, Cairo University, Cairo, Egypt
| | - G Esmat
- Faculty of Medicine, Cairo University, Cairo, Egypt
| | - I Waked
- National Liver Institute, Menoufiya University, Shebeen EL Kom, Egypt
| | - Y El Shazly
- Faculty of Medicine, Ain Shams University, Cairo, Egypt
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Montasser MF, Abdelkader NA, Ismail SA, F IM. Pretreatment and on-treatment indicators of virologic breakthrough of lamivudine therapy in chronic hepatitis B patients: an Egyptian study. Acta Virol 2014; 58:231-7. [PMID: 25283857 DOI: 10.4149/av_2014_03_231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The primary objectives of hepatitis B treatment include improved clinical and histological progression as well as virus eradication. For many years, lamivudine was a first-line therapy for treating hepatitis B virus (HBV) infection. However, its long-term use is associated with high resistance rates (up to 70% after 5 years) due to mutations in the viral YMDD motif. The purpose of this study was to outline factors responsible for the development of viral resistance during long-term lamivudine therapy. Initially, 230 patients receiving lamivudine therapy for chronic hepatitis B (CHB) infection were enrolled in the study. All subjects received follow-ups in the first year to assess viral and biochemical responses. Only 136 and 104 patients received follow-up assessments during the second and third years of treatment, respectively. Viral breakthrough (VBT) occurred in 49 of 230 patients (21.3%). Hepatitis B "e" antigen (HBeAg) status before treatment was significantly associated with VBT in the first 2 years of treatment; however, this effect was not significant in the third year. Pre-treatment HBV DNA levels were predictive of VBT in the HBeAg-positive subgroup after all years of treatment (P = 0.001, P = 0.002, and P = 0.002, respectively). These levels were also predictive in the HBeAg-negative subgroup after 1 year of treatment (P = 0.001). In resource-poor communities, financial concerns drive the selection of antiviral therapy to treat CHB. Lamivudine monotherapy is a relatively cheap and effective treatment to manage CHB. However, consistent follow-ups and treatment modifications appear essential to prevent long-term treatment failure.
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Ismail SA, McDonald A, Dubois E, Aljohani FG, Coutts AP, Majeed A, Rawaf S. Assessing the state of health research in the Eastern Mediterranean Region. J R Soc Med 2013; 106:224-33. [PMID: 23761582 DOI: 10.1258/jrsm.2012.120240] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Member states across the Eastern Mediterranean region face unprecedented health challenges, buffeted by demographic change, a dual disease burden, rising health costs, and the effects of ongoing conflict and population movements - exacerbated in the near-term by instability arising from recent political upheaval in the Middle East. However, health actors in the region are not well positioned to respond to these challenges because of a dearth of good quality health research. This review presents an assessment of the current state of health research systems across the Eastern Mediterranean based on publicly available literature and data sources. The review finds that - while there have been important improvements in productivity in the Region since the early 1990s - overall research performance is poor with critical deficits in system stewardship, research training and human resource development, and basic data surveillance. Translation of research into policy and practice is hampered by weak institutional and financial incentives, and concerns over the political sensitivity of findings. These problems are attributable primarily to chronic under-investment - both financial and political - in Research and Development systems. This review identifies key areas for a regional strategy and how to address challenges, including increased funding, research capacity-building, reform of governance arrangements and sustained political investment in research support. A central finding is that the poverty of publicly available data on research systems makes meaningful cross-comparisons of performance within the EMR difficult. We therefore conclude by calling for work to improve understanding of health research systems across the region as a matter of urgency.
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Affiliation(s)
- S A Ismail
- Imperial College London, South Kensington, London SW7 2AZ, UK
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Abstract
BACKGROUND The association of the novel adipokines visfatin and omentin-1 with psoriasis is still obscure. Data concerning other inflammatory diseases suggest a possible role of these adipokines in the pathophysiology of psoriasis. OBJECTIVES To investigate serum levels of visfatin and omentin-1 in patients with psoriasis compared with healthy controls, and to consider their relation to disease duration, disease severity and obesity markers. METHODS Visfatin and omentin-1 concentrations were measured in 46 patients with plaque-type psoriasis and 42 healthy controls by using specific enzyme-linked immunosorbent assays. RESULTS Patients with psoriasis showed considerably higher serum levels of visfatin than healthy controls with significant positive correlation with disease severity and duration. They also showed lower levels of ominten-1 compared with healthy controls with significant inverse correlation with body mass index and waist circumference. CONCLUSIONS Coordinated roles for visfatin and omentin-1 are suggested in the modulation of the inflammatory environment in patients with psoriasis. Given the significant relations of omentin-1 with obesity markers, the health consequences of excessive weight should be better communicated to patients with psoriasis.
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Affiliation(s)
- S A Ismail
- Department of Dermatology, Faculty of Medicine, Assiut University, 71515 Assiut, Egypt.
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Ismail SA, Park HW. Structural analysis of human liver glyceraldehyde-3-phosphate dehydrogenase. Acta Crystallogr D Biol Crystallogr 2005; 61:1508-13. [PMID: 16239728 DOI: 10.1107/s0907444905026740] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2005] [Accepted: 08/22/2005] [Indexed: 11/10/2022]
Abstract
The crystal structure of human liver glyceraldehyde-3-phosphate dehydrogenase (GAPDH) has been determined. This structure represents the first moderate-resolution (2.5 A) and crystallographically refined (Rfree = 22.9%) human GAPDH structure. The liver GAPDH structure consists of a homotetramer, each subunit of which is bound to a nicotinamide adenine dinucleotide (NAD+) molecule. The GAPDH enzyme has glycolytic and non-glycolytic functions, both of which are of chemotherapeutic interest. The availability of a high-quality human GAPDH structure is a necessity for structure-based drug design. In this study, structural differences between human liver and skeletal muscle GAPDHs are reported in order to understand how these two enzymes might respond to anti-trypanosomatid GAPDH inhibitors.
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Affiliation(s)
- S A Ismail
- Department of Molecular Sciences, University of Tennessee Health Science Center, USA
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Atia KS, Ismail SA, El-Arnaouty MB, Dessouki AM. Use of co-immobilized beta-amylase and pullulanase in reduction of saccharification time of starch and increase in maltose yield. Biotechnol Prog 2003. [PMID: 12790649 DOI: 10.1021/bp025661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Beta-amylase and pullulanase were co-immobilized to poly(acrylamide-acrylic acid) resin [P(AAm-AAc)] using 1-ethyl-3-(3-dimethylaminopropyl) carbodimide hydrochloride (EDC). The combined beta-amylase and pullulanase activity was 32% relative to the nonimmobilized beta-amylase. Co-immobilization of beta-amylase and pullulanase increased the maltose yield compared to thart of the immobilized beta-amylase alone and reduced the saccharification time to about 50 h. The results showed that there is a significant increase in the thermal stability, pH stability, and stability toward gamma irradiation. The results also suggest that the co-immobilization of beta-amylase and pullulanase is a potentially useful approach for commercial starch hydrolysis.
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Affiliation(s)
- K S Atia
- Nuclear Research Center, Division of Radioisotopes Applications, Abo-Zabel, P.O. Box 13759, Cairo, Egypt
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Atia KS, Ismail SA, El-Arnaouty MB, Dessouki AM. Use of co-immobilized beta-amylase and pullulanase in reduction of saccharification time of starch and increase in maltose yield. Biotechnol Prog 2003; 19:853-7. [PMID: 12790649 DOI: 10.1021/bp025661+] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [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: 11/29/2022]
Abstract
Beta-amylase and pullulanase were co-immobilized to poly(acrylamide-acrylic acid) resin [P(AAm-AAc)] using 1-ethyl-3-(3-dimethylaminopropyl) carbodimide hydrochloride (EDC). The combined beta-amylase and pullulanase activity was 32% relative to the nonimmobilized beta-amylase. Co-immobilization of beta-amylase and pullulanase increased the maltose yield compared to thart of the immobilized beta-amylase alone and reduced the saccharification time to about 50 h. The results showed that there is a significant increase in the thermal stability, pH stability, and stability toward gamma irradiation. The results also suggest that the co-immobilization of beta-amylase and pullulanase is a potentially useful approach for commercial starch hydrolysis.
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Affiliation(s)
- K S Atia
- Nuclear Research Center, Division of Radioisotopes Applications, Abo-Zabel, P.O. Box 13759, Cairo, Egypt
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Ismail SA, Dea T, Abd El-Rahman H, Yassien MA, Beuchat LR. Effectiveness of immersion treatments with acids, trisodium phosphate, and herb decoctions in reducing populations of Yarrowia lipolytica and naturally occurring aerobic microorganisms on raw chicken. Int J Food Microbiol 2001; 64:13-9. [PMID: 11252495 DOI: 10.1016/s0168-1605(00)00424-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Yarrowia lipolytica, one of the predominant yeasts in raw poultry, is believed to play a role in spoilage. This study was undertaken to investigate treatments to control the growth of Y. lipolytica on raw chicken stored at refrigeration temperature. Raw chicken wings inoculated with a mixture of five strains of Y. lipolytica isolated from raw poultry were dipped in solutions containing 2, 5, or 8% lactic acid, 2% lactic acid containing 0.2, 0.4, or 0.8% potassium sorbate or sodium benzoate, and 4, 8, or 12% trisodium phosphate solution. Populations of the yeast and total aerobic microorganisms were determined before and after treatment. Immersion of wings in 2% lactic acid (with or without 0.2% potassium sorbate or sodium benzoate) or 4% trisodium phosphate caused a significant (alpha = 0.05) reduction in numbers of Y. lipolytica and aerobic microorganisms. Treatment with 2% lactic acid containing 0.4 or 0.8% preservative did not result in additional significant reductions. Treatment of chicken wings with 2% lactic acid or 8% trisodium phosphate significantly reduced numbers of Y. lipolytica by 1.47 and 0.65 log10 cfu/g, respectively, and aerobic microorganisms by 2.60 and 1.21 log10 cfu/g, respectively, compared to controls. Growth of Y. lipolytica on wings stored at 5 degrees C for up to 9 days, however, was not affected by these treatments. Significant reductions in the population of Y. lipolytica occurred when the yeast was inoculated into 100% basil, marjoram, sage, and thyme decoctions, but not in 100% oregano or rosemary decoctions, held at 5 degrees C for 24 h. Treatment of chicken wings with 100% sage or thyme decoctions significantly reduced populations of Y. lipolytica but did not control its growth during storage at 5 degrees C for up to 9 days. The small, temporary decreases in numbers of Y. lipolytica and aerobic microorganisms resulting from immersion treatment of chicken wings with sage and thyme decoctions render these treatments of questionable value as preservation interventions.
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Affiliation(s)
- S A Ismail
- Center for Food Safety and Quality Enhancement, University of Georgia, Griffin 30223-1797, USA
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Ismail SA, Deak T, El-Rahman HA, Yassien MA, Beuchat LR. Presence and changes in populations of yeasts on raw and processed poultry products stored at refrigeration temperature. Int J Food Microbiol 2000; 62:113-21. [PMID: 11139011 DOI: 10.1016/s0168-1605(00)00414-1] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [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: 11/20/2022]
Abstract
A study was undertaken to determine populations and profiles of yeast species on fresh and processed poultry products upon purchase from retail supermarkets and after storage at 5 degrees C until shelf life expiration, and to assess the potential role of these yeasts in product spoilage. Fifty samples representing 15 commercial raw, marinated, smoked, or roasted chicken and turkey products were analyzed. Yeast populations were determined by plating on dichloran rose bengal chloramphenicol (DRBC) agar and tryptone glucose yeast extract (TGY) agar. Proteolytic activity was determined using caseinate and gelatin agars and lipolytic activity was determined on plate count agar supplemented with tributyrin. Populations of aerobic microorganisms were also determined. Initial populations of yeasts (log10 cfu/g) ranged from less than 1 (detection limit) to 2.89, and increased by the expiration date to 0.37-5.06, indicating the presence of psychrotrophic species. Highest initial populations were detected in raw chicken breast, wings, and ground chicken, as well as in turkey necks and legs, whereas roasted chicken and turkey products contained less than 1 log10 cfu/g. During storage, yeast populations increased significantly (P < or = 0.05) in whole chicken, ground chicken, liver, heart and gizzard, and in ground turkey and turkey sausage. Isolates (152 strains) of yeasts from poultry products consisted of 12 species. Yarrowia lipolytica and Candida zeylanoides were predominant, making up 39 and 26% of the isolates, respectively. Six different species of basidiomycetous yeasts representing 24% of the isolates were identified. Most Y. lipolytica strains showed strong proteolytic and lipolytic activities, whereas C. zeylanoides was weakly lipolytic. Results suggest that yeasts, particularly Y. lipolytica, may play a more prominent role than previously recognized in the spoilage of fresh and processed poultry stored at 5 degrees C.
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Affiliation(s)
- S A Ismail
- Center for Food Safety and Quality Enhancement, University of Georgia, Griffin 30223-1797, USA
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Ismail SA. Endoscopic findings in Saudi and non-Saudi patients with upper gastrointestinal disorders at El-Quawayah Hospital, Riyadh region, Saudi Arabia. Ann Saudi Med 1995; 15:188-9. [PMID: 17587938 DOI: 10.5144/0256-4947.1995.188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- S A Ismail
- Divisions of Gastroenterology and Tropical Medicine, El-Quawayah Hospital, Riyadh, Saudi Arabia
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Abstract
At Security Forces Hospital, 692 consecutive patients underwent surgery for gallstone disease over a period of two years. Eighty of these patients had a solitary gallbladder stone. They are compared, by their presentation, operative findings, mortality and morbidity rates, with the remaining patients harboring multiple gallstones. The demographic data were similar in both groups; however, the frequency of developing mucocele, empyema, gallbladder perforation and postoperative complications were significantly higher in the group with solitary stones than those with multiple gallstones. Furthermore, the need for emergency surgical intervention and technically difficult surgeries were also more frequent in the single stone group. It appears that a solitary gallbladder stone is associated with increased risks more than multiple stones; hence, it may be justified to offer the patient with a solitary stone more attention and surgical priority.
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Affiliation(s)
- A B Mofti
- Department of Surgery, Security Forces Hospital, Riyadh, Saudi Arabia
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Abstract
A total of 307 consecutive patients with symptomatic gallstones were admitted for cholecystectomy. Two hundred seventy patients (88%) were considered suitable for laparoscopic cholecystectomy. Forty-two of these (17%) were admitted on an emergency basis. The procedure was accomplished successfully in 246 patients (91%), while in the remaining 24 patients (9%), the attempt had to be abandoned and converted to open cholecystectomy. Postoperative complications, mostly minor, occurred in 22 patients (9%). Suspected common bile duct stones were treated with endoscopic retrograde cholangiopancreatography (ERCP) prior to surgery. The mean operative time was 82 minutes and 70% of the patients were discharged home within 489 hours after surgery and more than 90% were sent home by the third postoperative day. The results suggest that laparoscopic cholecystectomy is feasible for the majority of patients with symptomatic gallstones.
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Affiliation(s)
- A B Mofti
- Department of Surgery, Security Forces Hospital, Riyadh, Saudi Arabia
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Yegnanarayan R, Ismail SA, Shrotri DS. Anti-inflammatory effect of two earthworm potions in carrageenan pedal oedema test in rats. Indian J Physiol Pharmacol 1988; 32:72-4. [PMID: 3169964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Clark RE, Ismail SA, Jacobs A, Payne H, Smith SA. A randomized trial of 13-cis retinoic acid with or without cytosine arabinoside in patients with the myelodysplastic syndrome. Br J Haematol 1987; 66:77-83. [PMID: 3297129 DOI: 10.1111/j.1365-2141.1987.tb06893.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Ninety-eight consecutive patients with myelodysplastic syndrome were randomized to a treated or a control group, both receiving conventional supportive therapy. The treated group were given 13-cis-retinoic acid 20 mg/d if marrow blasts were less than or equal to 5% or cytosine arabinoside 10 mg/d subcutaneously on 6 d/week if marrow blasts were 6-30%, to which retinoic acid was added after 12 weeks. Serum levels of the drugs in the treated group were similar to those that would produce inhibition of CFU-GM growth in vitro. In patients in the low blast group receiving retinoic acid, myeloid surface antigens reverted from an abnormal to a normal pattern. Log rank analysis carried out after 25 months showed no significant difference in survival between the treated and control group, either in the total patient population or in the high and low blast groups considered separately. However, analysis of 39 non-sideroblastic patients with less than or equal to 5% blasts showed an increase in survival in the treated group.
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Ismail SA, Stek M. Observation of an intraoval precipitin (IOP) reaction in Schistosoma mansoni eggs. J Parasitol 1984; 70:312-3. [PMID: 6540803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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Abstract
Frozen Schistosoma mansoni eggs were successfully employed in the circumoval precipitin (COP) test for schistosomiasis yielding results comparable with fresh eggs. This development may permit both standardization and kit production of the COP test.
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Roy PR, Emanuel R, Ismail SA, El Tayib MH. Hereditary prolongation of the Q-T interval. Genetic observations and management in three families with twelve affected members. Am J Cardiol 1976; 37:237-43. [PMID: 1108632 DOI: 10.1016/0002-9149(76)90318-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Three families with the prolongation Q-T interval are described. Two demonstrated the nonsex-linked dominant mode of inheritance of the condition without neural deafness (the Romano-Ward syndrome). Family A had four affected members in three generations. Family B had three affected members in two generations, but the parents of the affected children were distant relatives. Family C had five affected members in three generations. Of the nine living affected members, seven were asymptomatic and never experienced syncope. The remaining two, aged 7 and 9 years, respectively, had multiple syncopal attacks. Of three affected members who died, two had electrocardiograms before death. The thirds, an apparently healthy boy of 14 years, had a single syncopal attack 13 months before he died in his sleep. The nature of the dysrhythmia causing syncope was documented in two cases. One of the affected children was treated successfully with a permanent demand pacemaker and propranolol, the other with propranolol alone. The electrophysiologic findings and the management of both symptomatic and asymptomatic patients are discussed.
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