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Eichengreen A, van Rooijen M, van Klaveren LM, Nasri M, Tsou YT, Koutamanis A, Baratchi M, Rieffe C. The impact of loose-parts-play on schoolyard social participation of children with and without disabilities: A case study. Child Care Health Dev 2024; 50:e13144. [PMID: 37322578 DOI: 10.1111/cch.13144] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 04/14/2023] [Accepted: 05/30/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Outdoor social participation in the school playground is crucial for children's socio-emotional and cognitive development. Yet, many children with disabilities in mainstream educational settings are not socially included within their peer group. We examined whether loose-parts-play (LPP), a common and cost-effective intervention that changes the playground play environment to enhance child-led free play, can promote social participation for children with and without disabilities. METHOD Forty-two primary school children, out of whom three had hearing loss or autism, were assessed for two baseline and four intervention sessions. We applied a mixed-method design, combining advanced sensors methodology, observations, peer nominations, self-reports, qualitative field notes and an interview with the playground teachers. RESULTS Findings indicated for all children a decrease during the intervention in social interactions and social play and no change in network centrality. Children without disabilities displayed also an increase in solitude play and in the diversity of interacting partners. Enjoyment of LPP was high for all children, yet children with disabilities did not benefit socially from the intervention and became even more isolated compared with baseline level. CONCLUSIONS Social participation in the schoolyard of children with and without disabilities did not improve during LPP in a mainstream setting. Findings emphasize the need to consider the social needs of children with disabilities when designing playground interventions and to re-think about LPP philosophy and practices to adapt them to inclusive settings and goals.
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Affiliation(s)
- Adva Eichengreen
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, The Netherlands
| | - Martin van Rooijen
- Department of Education, University of Humanistic Studies, Utrecht, The Netherlands
| | | | - Maedeh Nasri
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, The Netherlands
| | - Yung-Ting Tsou
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, The Netherlands
| | - Alexander Koutamanis
- Department of Management in the Built Environment, Delft University of Technology, Delft, The Netherlands
| | - Mitra Baratchi
- Leiden Institute of Advanced Computer Science, Leiden University, Leiden, The Netherlands
| | - Carolien Rieffe
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, The Netherlands
- Department of Human Media Interaction, Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, Enschede, The Netherlands
- Department of Psychology and Human Development, Institute of Education, University College London, London, UK
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Eichengreen A, Tsou YT, Nasri M, van Klaveren LM, Li B, Koutamanis A, Baratchi M, Blijd-Hoogewys E, Kok J, Rieffe C. Social connectedness at the playground before and after COVID-19 school closure. J Appl Dev Psychol 2023; 87:101562. [PMID: 37396499 PMCID: PMC10305783 DOI: 10.1016/j.appdev.2023.101562] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 06/16/2023] [Accepted: 06/16/2023] [Indexed: 07/04/2023]
Abstract
Social connectedness at school is crucial to children's development, yet very little is known about the way it has been affected by school closures during COVID-19 pandemic. We compared pre-post lockdown levels of social connectedness at a school playground in forty-three primary school-aged children, using wearable sensors, observations, peer nominations and self-reports. Upon school reopening, findings from sensors and peer nominations indicated increases in children's interaction time, network diversity and network centrality. Group observations indicated a decrease in no-play social interactions and an increase in children's involvement in social play. Explorative analyses did not reveal relations between changes in peer connectedness and pre-lockdown levels of peer connectedness or social contact during the lockdown period. Findings pointed at the role of recess in contributing to children's social well-being and the importance of attending to their social needs upon reopening.
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Affiliation(s)
- Adva Eichengreen
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, the Netherlands
| | - Yung-Ting Tsou
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, the Netherlands
| | - Maedeh Nasri
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, the Netherlands
| | | | - Boya Li
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, the Netherlands
| | - Alexander Koutamanis
- Department of Management in the Built environment, Delft University of Technology, Delft, the Netherlands
| | - Mitra Baratchi
- Leiden Institute of Advanced Computer Science, Leiden University, Leiden, the Netherlands
| | - Els Blijd-Hoogewys
- INTER-PSY, Autism Team, Groningen, the Netherlands
- Department of Clinical and Developmental Psychology, Faculty of Behavioral and Social Sciences, University of Groningen, Groningen, the Netherlands
| | - Joost Kok
- Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, Enschede, the Netherlands
| | - Carolien Rieffe
- Department of Developmental and Educational Psychology, Institute of Psychology, Leiden University, Leiden, the Netherlands
- Department of Human Media Interaction, Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, Enschede, the Netherlands
- Department of Psychology and Human Development, Institute of Education, University College London, London, UK
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Nasri M, Tsou YT, Koutamanis A, Baratchi M, Giest S, Reidsma D, Rieffe C. Correction: Nasri et al. A Novel Data-Driven Approach to Examine Children's Movements and Social Behaviour in Schoolyard Environments. Children 2022, 9, 1177. Children (Basel) 2022; 9:children9121882. [PMID: 36553443 PMCID: PMC9721453 DOI: 10.3390/children9121882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 10/21/2022] [Indexed: 12/04/2022]
Abstract
The authors request the following corrections because the changes made according to the second round of the review process were not included in the original publication [...].
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Affiliation(s)
- Maedeh Nasri
- Unit of Developmental and Educational Psychology, Institute of Psychology, Leiden University, 2300 RB Leiden, The Netherlands
- Leiden-Delft-Erasmus Centre for BOLD Cities, Leiden University, 2300 RA Leiden, The Netherlands
- Correspondence:
| | - Yung-Ting Tsou
- Unit of Developmental and Educational Psychology, Institute of Psychology, Leiden University, 2300 RB Leiden, The Netherlands
- Department of Computer Science, Faculty of Science, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Alexander Koutamanis
- Faculty of Architecture & the Built Environment, Delft University of Technology, 2628 BL Delft, The Netherlands
| | - Mitra Baratchi
- Leiden Institute of Advanced Computer Science, Leiden University, 2300 RA Leiden, The Netherlands
| | - Sarah Giest
- Institute of Public Administration, Faculty of Governance and Global Affairs, Leiden University, 2511 DC The Hague, The Netherlands
| | - Dennis Reidsma
- Human Media Interaction Research Group, Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, 7522 NB Enschede, The Netherlands
| | - Carolien Rieffe
- Unit of Developmental and Educational Psychology, Institute of Psychology, Leiden University, 2300 RB Leiden, The Netherlands
- Human Media Interaction Research Group, Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, 7522 NB Enschede, The Netherlands
- Department of Psychology and Human Development, Institute of Education, University College London, London WC1H 0AA, UK
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Hamidi M, Moghadam HT, Nasri M, Kasraie P, Larijani H. The effect of ascorbic acid and bio fertilizers on basil under drought stress. BRAZ J BIOL 2022; 84:e262459. [PMID: 35830132 DOI: 10.1590/1519-6984.262459] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 05/25/2022] [Indexed: 11/22/2022] Open
Abstract
Evaluate the effect of ascorbic acid application and coexistence of Mycorrhiza fungus and Azospirillium on basil (Ocimum basilicum L.) under drought stress. This experiment was performed as a split factorial in a randomized complete block design with three replications in the crop year 2017-2018 in Shahriar, Iran. In this experiment, irrigation was the main factor in three levels, including drought stress based on 40-70-100 mm from the evaporation pan of class A. Biofertilizer including growth-promoting bacteria (Azospirillium) and mycorrhiza fungus in four levels, including a(Non-consumption) B (Seeds of growth-promoting bacteria (Azospirillium)) C (Consumption of mycorrhiza fungus as seeds) D (Concomitant use of growth-promoting bacteria Azospirillium with mycorrhiza fungi as seeds) and ascorbic acid in two levels of foliar application, including A (Absence Application of ascorbic acid) and B (Application of ascorbic acid (two days after irrigation treatment)) was considered as a factorial factor. The results showed that the highest biological yield was obtained in drought stress of 40 mm and application of biological fertilizers in the form of mycorrhiza application with an average of 3307.1 kg/ha, which was about 70% more than 100 mm evaporation stress and no application of biological fertilizer. The use of ascorbic acid under drought stress conditions improved by 10%, the essential oil using ascorbic acid evaporated under drought stress conditions of 100 mm. As a general conclusion, the use of ascorbic acid and Mycorrhiza + Azospirillium biological fertilizer improved the quantitative and qualitative characteristics of basil under drought stress.
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Affiliation(s)
- M Hamidi
- Islamic Azad University, Varamin-Pishva Branch, College of Agriculture, Department of Agronomy, Varamin, Iran
| | - H Tohidi Moghadam
- Islamic Azad University, Varamin-Pishva Branch, College of Agriculture, Department of Agronomy, Varamin, Iran
| | - M Nasri
- Islamic Azad University, Varamin-Pishva Branch, College of Agriculture, Department of Agronomy, Varamin, Iran
| | - P Kasraie
- Islamic Azad University, Varamin-Pishva Branch, College of Agriculture, Department of Agronomy, Varamin, Iran
| | - H Larijani
- Islamic Azad University, Varamin-Pishva Branch, College of Agriculture, Department of Agronomy, Varamin, Iran
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Ritter MU, Nasri M, Dannenmann B, Kaufmann MM, Zeidler KA, Zeidler C, Klimiankou M, Cathomen T, Welte K, Skokowa J. A selection free ex vivo gene therapy approach to congenital
neutropenia causing HAX1 mutations. KLINISCHE PADIATRIE 2022. [DOI: 10.1055/s-0042-1748736] [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] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- MU Ritter
- Innere Medizin 2, Universitätsklinikum Tübingen,
Germany
| | - M Nasri
- Innere Medizin 2, Universitätsklinikum Tübingen,
Germany
| | - B Dannenmann
- Innere Medizin 2, Universitätsklinikum Tübingen,
Germany
| | | | - KA Zeidler
- Allgemeine Pädiatrie, Hämatologie, Onkologie,
Universitätsklinikum Tübingen, Germany
| | - C Zeidler
- Klinik für Pädiatrische Hämatologie und
Onkologie, Medizinische Hochschule Hannover, Germany
| | - M Klimiankou
- Innere Medizin 2, Universitätsklinikum Tübingen,
Germany
| | - T Cathomen
- ITG, Universitätsklinikum Freiburg, Germany
| | - K Welte
- Allgemeine Pädiatrie, Hämatologie, Onkologie,
Universitätsklinikum Tübingen, Germany
| | - J Skokowa
- Innere Medizin 2, Universitätsklinikum Tübingen,
Germany
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Nasri M, Henchiri C, Dhahri R, Dhahri E, Omari L, Mariano JF. Theoretical study of magnetic and magnetocaloric properties and MCE modeling by the mean-field theory in CoFeCuO4 spinel ferrite. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2021.109103] [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: 11/26/2022]
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Nasri M, Henchiri C, Dhahri R, Khelifi J, Dhahri E, Mariano JF. Study of structural, magnetic, magnetocaloric properties and critical behavior of CoFeCuO4 spinel ferrite. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108933] [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: 10/20/2022]
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Klajer E, Jary M, Borg C, Kim S, Vernerey D, Henriques J, N'Guyen T, Nasri M, Almotlak H, Babre J, Meurisse A, Fratte S, Fein F, Calcagno F, Chanut L, Spehner L, Rebucci-Peixoto M, Vienot A. 509TiP REPROGRAM-01, a phase II study of regorafenib in combination with a multimodal metronomic chemotherapy in patients with metastatic colorectal cancer. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1028] [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: 10/20/2022] Open
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Louati I, Hadrich B, Nasri M, Belbahri L, Woodward S, Mechichi T. Modelling of Reactive Black 5 decolourization in the presence of heavy metals by the newly isolated
Pseudomonas aeruginosa
strain Gb30. J Appl Microbiol 2019; 126:1761-1771. [DOI: 10.1111/jam.14262] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 02/11/2019] [Accepted: 03/18/2019] [Indexed: 11/28/2022]
Affiliation(s)
- I. Louati
- Laboratory of Enzyme Engineering and Microbiology National School of Engineers of Sfax University of Sfax Sfax Tunisia
| | - B. Hadrich
- Unité de Biotechnologie des Algues Biological Engineering Department National School of Engineers of Sfax University of Sfax Sfax Tunisia
| | - M. Nasri
- Laboratory of Enzyme Engineering and Microbiology National School of Engineers of Sfax University of Sfax Sfax Tunisia
| | - L. Belbahri
- Laboratoire de biologie des sols Université de Neuchâtel Neuchâtel Switzerland
| | - S. Woodward
- School of Biological Sciences University of Aberdeen Aberdeen UK
| | - T. Mechichi
- Laboratory of Enzyme Engineering and Microbiology National School of Engineers of Sfax University of Sfax Sfax Tunisia
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases National School of Engineers of Sfax University of Sfax Sfax Tunisia
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Abbes I, Abdelhak S, Abdelhedi C, Abid K, Abidi R, Acacha E, Achour S, Achour A, Adouni O, Afrit M, Ahlem A, Akik I, Akremi M, Aloui R, Aloulou S, Ammar N, Arem S, Athimni S, Attia L, Attia M, Ayadi M, Ayadi A, Ayadi K, Ayadi H, Ayadi L, Ayadi I, Ayari J, Azzouz H, Bacha D, Bahloul R, Bahri I, Bahri M, Bakir D, Balti M, Bargaoui H, Batti R, Bayar R, Bdioui Thabet A, Beji M, Bel Hadj Hassen S, Bel Haj Ali A, Belaid I, Belaid A, Beldjiilali Y, Belkacem O, Bellamlih O, Ben Abdallah W, Ben Abdallah M, Ben Abdellah H, Ben Abderrahmen S, Ben Ahmed S, Ben Ahmed K, Ben Ayache M, Ben Ayoub W, Ben Azaiz M, Ben Azouz M, Ben Daly A, Ben Dhia S, Ben Dhiab M, Ben Dhiab T, Ben Fatma L, Ben Ghachem D, Ben Hammadi S, Ben Hassen M, Ben Hassena R, Ben Hassouna J, Ben Kridis W, Ben Leila F, Ben Mahfoudh KH, Ben Mustapha N, Ben Nasr S, Ben Othman F, Ben Rejeb M, Ben Rekaya M, Ben Rhouma S, Ben Safta Z, Ben Safta I, Ben Said A, Ben Salah M, Ben Salah H, Ben Slama S, Ben Temime R, Ben Youssef Y, Ben Zid K, Benabdella H, Benasr S, Bengueddach A, Benna M, Benna F, Bergaoui H, Berrazaga Y, Besbes M, Bhiri H, Bibi M, Blel A, Bohli M, Bouali S, Bouaouina N, Bouassida K, Bouaziz H, Boubaker J, Boudaouara T, Boudaouara Z, Boudaouara O, Boughanmi F, Boughattas W, Boughizane S, Bouguila H, Bouhani M, Bouhlel B, Boujelbane N, Boujemaa M, Boulma R, Bouraoui S, Bouriga R, Bourmech M, Bousrih C, Boussen H, Boussen N, Bouzaien F, Bouzayene F, Brahem I, Briki R, Chaabene K, Chaabouni M, Chaari H, Chabchoub I, Chachia S, Chaker K, Chamlali M, Charfi L, Charfi M, Charfi S, Charradi H, Cheffai I, Chelly B, Chelly I, Chenguel A, Cherif A, Cherif O, Chiboub A, Chouchene A, Chraiet N, Daghfous A, Daldoul A, Daoud N, Daoud J, Daoud R, Daoud E, Debaibi M, Dhaouadi S, Dhief R, Dhouib F, Dimassi S, Djebbi A, Doghri R, Doghri Y, Doudech B, Dridi M, El Amine O, El Benna H, El Khal MC, Eladeb M, Elloumi M, Elmeddeb K, Enaceur F, Ennouri S, Essoussi M, Ezzairi F, Ezzine A, Faleh R, Fallah S, Faouzi N, Fathallah K, Fehri R, Feki J, Fekih M, Fendri S, Fessi Z, Fourati N, Fourati M, Frikha I, Frikha M, Gabsi A, Gadria S, Gamoudi A, Gargoura A, Gargouri W, Ghariani N, Ghazouani E, Ghorbal A, Ghorbel L, Ghorbel S, Ghozzi A, Glili A, Gmadh K, Goucha A, Gouiaa N, Gritli S, Guazzah K, Guebsi A, Guermazi Z, Guermazi F, Gueryani N, Guezguez M, Hacheni F, Hachicha M, Haddad A, Haddaoui A, Hadoussa M, Haj Mansour M, Hajjaji A, Hajji A, Hamdi A, Hamdi Y, Hammemi R, Haouet S, Hdiji A, Hechiche M, Hedfi M, Helali AJ, Henchiri H, Heni S, Hentati A, Herbegue K, Hidar S, Hlaf M, Hmida W, Hmida I, Hmida L, Hmila Ben Salem I, Hochlef M, Hsairi M, Jaffel H, Jaidane M, Jarraya H, Jebsi M, Jedidi M, Jlassi A, Jlassi H, Jmal H, Jmour O, Jouini M, Kabtni W, Kacem M, Kacem S, Kacem I, Kaid M, Kairi H, Kallel M, Kallel R, Kallel F, Kammoun H, Kamoun S, Kanoun Belajouza S, Karray W, Karrit S, Karrou M, Kchir N, Kdous S, Kehili H, Keskes H, Khairi H, Khalfallah MT, Khalifa MB, Khanfir A, Khanfir F, Khechine W, Khemiri S, Khiari H, Khlif A, Khouni H, Khrouf S, Kochbati L, Korbi I, Korbi A, Krir MW, Ksaier I, Ksantini R, Ksantini M, Ksantini F, Ktari K, Laabidi S, Laamouri B, Labidi A, Lahmar A, Lahouar R, Lamine O, Letaief F, Limaiem F, Limayem I, Limem S, Limem F, Loghmari A, M'ghirbi F, Maamouri F, Magherbi H, Mahjoub N, Mahjoub M, Mahjoubi K, Majdoub S, Makhlouf T, Makni A, Makni S, Mallat N, Manai MH, Mansouri H, Maoua M, Marghli I, Masmoudi T, Mathlouthi N, Meddeb K, Medini B, Mejri N, Merdessi A, Mesali C, Mezlini E, Mezlini A, Mezni E, Mghirbi F, Mhiri N, Mighri N, Mlika M, Mnejja W, Mnif H, Mokni M, Mokrani A, Mosbah F, Moujahed R, Mousli A, Moussa A, Mrad Dali K, Mrizak N, Msakni I, Mzabi S, Mzali R, Mzoughi Z, Naimi Z, Najjar S, Nakkouri R, Nasr C, Nasrallah D, Nasri M, Njim L, Noubigh GEF, Nouira Y, Nouri O, Omrani S, Osmane W, Ouanes Y, Ouanna N, Oubich F, Oumelreit Belamlih G, Rachdi H, Rafraf F, Rahal K, Raies H, Rammeh S, Rebaii N, Rekik W, Rekik H, Rhim MS, Rhim S, Rihab D, Rjiba R, Rziga T, Saad H, Saad A, Saadi M, Said N, Salah R, Sallemi N, Sassi A, Sassi K, Sassi Mahfoudh A, Sbika W, Sellami A, Serghini M, Sghaier S, Sh Zidi Y, Siala W, Slimane M, Slimani O, Soltani S, Souguir MK, Sridi A, Tabet Zatla A, Tajina D, Talbi G, Tbessi S, Tebra Mrad S, Temessek H, Tlili G, Toumi N, Toumi O, Toumia N, Tounsi H, Trigui E, Triki M, Triki A, Turki M, Werda I, Yahyaoui S, Yahyaoui Y, Yaich A, Yamouni M, Yazid D, Yousfi A, Zaghouani H, Zaied S, Zairi F, Zaraa S, Zehani A, Zenzri Y, Zidi A, Znaidi N, Zouari K, Zouari S, Zoukar O, Zribi A. Summaries of the papers of the 4th National Congress of the Tunisian Society of Medical Oncology attached to the 4th Maghreb Congress of Oncology. Tunis Med 2017; 95:859-964. [PMID: 29873056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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El Amine Elhadj O, Nasri M, Thabet S, Ben Hassouna J, Goucha A, Rahal K, Elmay A, Gamoudi A. [Primary breast sarcomas: About 30 cases treated at Salah-Azaiez institute in Tunisia]. Cancer Radiother 2017; 21:45-50. [PMID: 28223032 DOI: 10.1016/j.canrad.2016.09.011] [Citation(s) in RCA: 2] [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] [Received: 04/19/2016] [Revised: 09/01/2016] [Accepted: 09/11/2016] [Indexed: 10/20/2022]
Abstract
PURPOSE To identify retrospectively prognostic factors of primary breast sarcoma and review its treatment modalities. MATERIALS AND METHODS This is a descriptive study on 30 cases of primary breast sarcoma. We carried out a univariate and multivariate analysis correlating clinical, pathological and therapeutic parameters with disease-free survival and overall survival. RESULTS The mean age was 46.8 years. The mean tumour size was 10cm. The 30 cases were 18 phyllodes sarcomas, eight angiosarcomas, three liposarcomas and a case of granulocytic sarcoma. Sixteen patients had adjuvant radiotherapy and only seven patients received adjuvant chemotherapy. The median follow-up was 64 months. Overall survival rates at 3 and 5 years were 49.1% and 33.7%. Disease-free survival rates at 3 and 5 years were 22.8% and 15.2% respectively. The analytical study of the following parameters: tumour size and presence or absence of node or distant metastases, showed no correlation with overall survival nor with disease-free survival. Furthermore, adjuvant radiotherapy did not improve overall survival (P=0.298; hazard ratio [HR]=1 [0.982-1.04]) nor disease-free survival (P=0.61; HR=0.942 [0.862-1.029]). By univariate analyses, we identified a correlation between overall survival, surgical margins (>1cm) (P=0005; HR=3.4 [1.217-9.919]) and tumour necrosis (P=0.028; HR=0.099 [0.014-0.682]). We did not find any independent prognostic factor by multivariate analysis. CONCLUSION The prognosis of primary breast sarcoma seems to depend essentially on optimal surgical excision (margin over 1cm). The only potential histological parameter correlated with the prognosis is the presence of tumour necrosis. The histological subtype should not be considered as a prognostic marker for overall or disease-free survival in patients with primary breast sarcoma.
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Affiliation(s)
- O El Amine Elhadj
- Service d'immuno-histocytologie, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie.
| | - M Nasri
- Service d'oncologie médicale, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
| | - S Thabet
- Service d'immuno-histocytologie, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
| | - J Ben Hassouna
- Service de chirurgie carcinologique, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
| | - A Goucha
- Service d'immuno-histocytologie, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
| | - K Rahal
- Service de chirurgie carcinologique, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
| | - A Elmay
- Service d'immuno-histocytologie, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
| | - A Gamoudi
- Service d'immuno-histocytologie, institut Salah-Azaiez, boulevard 9-avril, 1006 Bab-Saadoun, Tunis, Tunisie
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Nasri M. Protein Hydrolysates and Biopeptides: Production, Biological Activities, and Applications in Foods and Health Benefits. A Review. Adv Food Nutr Res 2016; 81:109-159. [PMID: 28317603 DOI: 10.1016/bs.afnr.2016.10.003] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In recent years, a great deal of interest has been expressed regarding the production, characterization, and applications of protein hydrolysates and food-derived biopeptides due to their numerous beneficial health effects. In this regard, research is mainly focused on investigating the therapeutic potential of these natural compounds. Based on their amino acids composition, sequences, hydrophobicity, and length, peptides released from food proteins, beyond their nutritional properties, can exhibit various biological activities including antihypertensive, antioxidative, antithrombotic, hypoglycemic, hypocholesterolemic, and antibacterial activities among others. Protein hydrolysates are essentially produced by enzymatic hydrolysis of whole protein sources by appropriate proteolytic enzymes under controlled conditions, followed by posthydrolysis processing to isolate desired and potent bioactive peptides from a complex mixture of active and inactive peptides. Therefore, because of their human health potential and safety profiles, protein hydrolysates and biopeptides may be used as ingredients in functional foods and pharmaceuticals to improve human health and prevent diseases. In this review, we have focused on the major variables influencing the enzymatic process of protein hydrolysates production. The biological properties of protein hydrolysates will be described as well as their applications in foods and health benefits.
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Affiliation(s)
- M Nasri
- Laboratory of Enzyme Engineering and Microbiology, University of Sfax, National Engineering School of Sfax, B.P. 1173-3038, Sfax, Tunisia.
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Labidi S, Nasri M, El Benna H, Mejri N, Afrit M, Rachdi H, Boussen H. 265P Epidemiology, outcome and prognostic factors of biliary tract cancer in the Tunisian population. Ann Oncol 2016. [DOI: 10.1016/s0923-7534(21)00422-1] [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: 10/22/2022] Open
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Labidi S, Nasri M, El Benna H, Mejri N, Afrit M, Rachdi H, Boussen H. 265P Epidemiology, outcome and prognostic factors of biliary tract cancer in the Tunisian population. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw582.046] [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: 11/12/2022] Open
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Nasri M, Labidi S, Rachdi H, El Benna H, Mejri N, Afrit M, Boussen H. RM-027 Epidemiology, treatment and outcome of pancreatic cancer in Tunisia. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw201.26] [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: 11/14/2022] Open
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Jridi M, Siala R, Fakhfakh N, Ayadi M, Elhatmi M, Taktak M, Nasri M, Zouari N. Effect of rosemary leaves and essential oil on turkey sausage quality. Acta Alimentaria 2015. [DOI: 10.1556/066.2015.44.0025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Maalej H, Hmidet N, Boisset C, Buon L, Heyraud A, Nasri M. Optimization of exopolysaccharide production from Pseudomonas stutzeri
AS22 and examination of its metal-binding abilities. J Appl Microbiol 2014; 118:356-67. [DOI: 10.1111/jam.12688] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 10/14/2014] [Accepted: 11/01/2014] [Indexed: 01/29/2023]
Affiliation(s)
- H. Maalej
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de Sfax-Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - N. Hmidet
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de Sfax-Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - C. Boisset
- Centre de Recherches sur les Macromolécules Végétales; C.N.R.S.; Université Joseph Fourier; Grenoble Cedex France
| | - L. Buon
- Centre de Recherches sur les Macromolécules Végétales; C.N.R.S.; Université Joseph Fourier; Grenoble Cedex France
| | - A. Heyraud
- Centre de Recherches sur les Macromolécules Végétales; C.N.R.S.; Université Joseph Fourier; Grenoble Cedex France
| | - M. Nasri
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de Sfax-Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
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Hammami I, Siala R, Jridi M, Ktari N, Nasri M, Triki M. Partial purification and characterization of chiIO8, a novel antifungal chitinase produced by Bacillus cereus
IO8. J Appl Microbiol 2013; 115:358-66. [DOI: 10.1111/jam.12242] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Revised: 03/08/2013] [Accepted: 03/12/2013] [Indexed: 11/29/2022]
Affiliation(s)
- I. Hammami
- Unité de Recherche Protection des Plantes Cultivées et Environnement; Institut de l'Olivier; Sfax Tunisia
| | - R. Siala
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - M. Jridi
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - N. Ktari
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - M. Nasri
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - M.A. Triki
- Unité de Recherche Protection des Plantes Cultivées et Environnement; Institut de l'Olivier; Sfax Tunisia
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Fakhfakh N, Ktari N, Siala R, Nasri M. Wool-waste valorization: production of protein hydrolysate with high antioxidative potential by fermentation with a new keratinolytic bacterium, Bacillus pumilus A1. J Appl Microbiol 2013; 115:424-33. [PMID: 23663724 DOI: 10.1111/jam.12246] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [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: 02/24/2013] [Revised: 05/05/2013] [Accepted: 05/07/2013] [Indexed: 11/27/2022]
Abstract
AIMS Wool, a recalcitrant waste mainly composed of keratin, constituted a serious problem for the environment and was not effectively valorized. This study reported the optimization of wool-waste biodegradation by a new keratinolytic bacterium Bacillus pumilus A1. The in vitro digestibility and the antioxidant potential of wool protein hydrolysate (WPH) were also investigated. METHODS AND RESULTS The antioxidant potential of WPH was evaluated using in vitro antioxidant assays, such as 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging activity, reducing power and metal (Fe(2+)) chelating activity. Cultivation on 50 g l(-1) of wool for 2 days, at 45°C and at initial pH of 10, resulted in maximum production of amino acids and peptides (39.7 g l(-1)). WPH presented a very high in vitro digestibility (97%) as compared with that of the untreated wool (3%). CONCLUSIONS The keratin present into the wool-waste was completely solubilized. Interestingly, WPH presented an important DPPH radical-scavenging activity with an IC50 value of 0.14 ± 0.01 mg ml(-1). SIGNIFICANCE AND IMPACT OF STUDY WPH would be a very useful source of protein and antioxidants in animals' diets.
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Affiliation(s)
- N Fakhfakh
- Laboratoire de Génie Enzymatique et de Microbiologie, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, Sfax, Tunisia.
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Hemissi H, Nasri M, Abid S, Al-Deyab S, Dhahri E, Hlil E, Rzaigui M. Crystal structure, spectroscopic, magnetic and electronic structure studies of a novel Cu(II) amino acid complex [Cu(l-arg)2(H2O)]2(P4O12)·8H2O. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.07.004] [Citation(s) in RCA: 12] [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: 01/18/2023]
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Soussi MS, Jebali MA, Le Manach Y, Nasri M, Zouari B, Chenik S, Ferjani M. Central venous saturation is not an alternative to mixed venous saturation during cardiopulmonary bypass in coronary artery surgery patients. Perfusion 2012; 27:300-6. [PMID: 22499058 DOI: 10.1177/0267659112442902] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND To evaluate the correlation and agreement between central venous saturation (ScvO(2)) and mixed venous saturation (SvO(2)) during cardiopulmonary bypass. METHODS Twenty-two consecutive patients scheduled for coronary artery surgery were prospectively included. Paired measurements of ScvO(2) and SvO(2) were performed 5 minutes after aortic cross-clamping, after each cardioplegia dose and after de-clamping of the aortic cross-clamp. ScvO(2) and SvO(2) were measured, respectively, by a fibreoptic catheter in the superior vena cava and on blood samples from the venous return line of the extracorporeal circuit, using a blood gas analyser RESULTS Ninety-five paired measurements of venous saturation were obtained. Correlation between the measurements was associated with an r = 0.55. The mean bias was 2.2 [Limits of agreement: -13.6%, +18%]. Changes in oxygen saturation over time showed an r = 0.4 and a mean bias of 0.2 [Limits of agreement: -17.9%, +18.3%]. Multivariate analysis identified the oxygen consumption index as the only factor explaining this variability. CONCLUSIONS Although mean biases between the measurements were low, limits of agreement were too large to provide a clinically acceptable estimation of SvO(2) by ScvO(2) in these conditions. Variations in regional oxygen consumption seem to be the main factor worsening the relationship.
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Affiliation(s)
- M S Soussi
- Department of Anaesthesiology and Critical Care, Military Hospital, Tunis University, Tunis, Tunisia
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Gharsallah H, Lamine K, Hajjaj Z, Nasri M, Ferjani M. [Exposure to butane gas and hyperbaric oxygenation therapy]. Tunis Med 2010; 88:63. [PMID: 20415221] [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: 05/29/2023]
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Fathallah B, Amor MBH, Hichri N, Nasri M, Hbaieb W, Lamine K, Ferjani M. Hemodynamic effects of association of vasopressin and norepinephrine in patients with septic shock. Crit Care 2008. [PMCID: PMC4088775 DOI: 10.1186/cc6625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Ghorbel-Frikha B, Sellami-Kamoun A, Fakhfakh N, Haddar A, Manni L, Nasri M. Production and purification of a calcium-dependent protease from Bacillus cereus BG1. J Ind Microbiol Biotechnol 2005; 32:186-94. [PMID: 15843974 DOI: 10.1007/s10295-005-0228-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2004] [Accepted: 03/18/2005] [Indexed: 10/25/2022]
Abstract
The production and purification of a calcium-dependent protease by Bacillus cereus BG1 were studied. The production of the protease was found to depend specifically on the calcium concentration in the culture medium. This suggests that this metal ion is essential for the induction of protease production and/or stabilisation of the enzyme after synthesis. The calcium requirement is highly specific since other metal ions (such as Mg(2+) and Ba(2+), which both activate the enzyme) are not able to induce protease production. The most appropriate medium for growth and protease production comprises (g L(-1)) starch 5, CaCl(2) 2, yeast extract 2, K(2)HPO(4) 0.2 and KH(2)PO(4) 0.2. The protease of BG1 strain was purified to homogeneity by ultrafiltration, heat treatment, gel filtration on Sephacryl S-200, ion exchange chromatography on DEAE-cellulose and, finally, a second gel filtration on Sephacryl S-200, with a 39-fold increase in specific activity and 23% recovery. The molecular weight was estimated to be 34 kDa on SDS-PAGE. The optimum temperature and pH of the purified enzyme were determined to be 60 degrees C and 8.0, respectively, in 100 mM Tris-HCl buffer + 2 mM CaCl(2).
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Affiliation(s)
- B Ghorbel-Frikha
- Laboratoire de Génie Enzymatique et de Microbiologie, Ecole Nationale d'Ingénieurs de Sfax, Tunisia
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Khannous L, Souissi N, Ghorbel B, Jarboui R, Kallel M, Nasri M, Gharsallah N. Treatment of saline wastewaters from marine-products processing factories by activated sludge reactor. Environ Technol 2003; 24:1261-1268. [PMID: 14669806 DOI: 10.1080/09593330309385668] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An activated sludge reactor, operated at room temperature (20-30 degrees C) was used to treat saline wastewaters generated by marine-products industries. The system was operated continuously and the influence of the organic loading rates (OLRs), varying from 250 to 1000 mg COD l(-1) day(-1), on chemical oxygen demand (COD) removal was investigated. The system, inoculated with NaCl-acclimated culture, removed up to 98% and 88% of the influent COD concentrations at OLRs of 250 and 1000 mg COD L(-1) day(-1), respectively. Since the organic pollution is essentially composed of proteins, microorganisms, which produced proteolytic enzymes, were isolated from the activated sludge culture. One bacterium with the highest protease activity, identified as Bacillus cereus, was chosen for protease production in fishery wastewaters of different concentrations containing combined heads and viscera powder. Protease synthesis was strongly enhanced when cells were cultivated in two times diluted fishery wastewaters. The enhancement of protease synthesis could have been due to the presence in effluent of organic matters or salts, which stimulated the growth of the strain and protease production.
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Affiliation(s)
- L Khannous
- Unité de Technologie Enzymatique et de Microbiologic, Département de Génie Biologique, Ecole Nationale d'Ingénieurs de Sfax, BP W 3038 Sfax, Tunisia
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Hachicha R, Rigane H, Ben Khodher M, Nasri M, Medhioub K. Effects of partial stone removal on the co-composting of olive-oil processing solid residues with poultry manure and the quality of compost. Environ Technol 2003; 24:59-67. [PMID: 12641253 DOI: 10.1080/09593330309385536] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Full scale composting studies were performed with stoned (SEOOPSW) and non stoned exhausted olive-oil processing solid waste (NSEOOPSW) mixed with 20% poultry manure to reach a C/N ratio of around 30 and to improve the chemical and microbiological properties of the end products. The experiment was performed on two windrows (3 m wide, 2.5 m high and 10 tonne weight) to investigate the effects of stone removal and poultry manure addition on composting process efficiency and on the quality of composts. The partially stone removal operation reduced the total composting time by at least one month compared with the untreated waste. The addition of poultry manure improved the chemical quality of the end product, as shown by the doubling of the nitrogen concentration after four months composting together with the increased amount of P and K. Compost from stoned exhausted olive-oil processing solid waste had higher levels of cation exchange capacity (CEC) and humic acid content with a lower [FA/HA] ratio indicating a high polymerisation level. Agronomic field test showed that both composts are not phytotoxic. When applied at the rate of 40 tonne ha(-1) to a potato culture, they produced approximately the same yield (46 and 48.5 tonne ha(-1)) but they acted differently in terms of plant development. Compost produced from the NSEOOPSW acted more positively on the stem length (84.1 against 77.6 cm) and on leaf weight (354 against 238 g), whereas compost from the SEOOPSW more positively affected tuber sizes (76% large grade compared to 55%).
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Affiliation(s)
- R Hachicha
- Laboratoire des Sciences de l'Environnement, ENIS. B.P. W. 3038 SFAX-Tunisia
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Ellouz Y, Bayoudh A, Kammoun S, Gharsallah N, Nasri M. Production of protease by Bacillus subtilis grown on sardinelle heads and viscera flour. Bioresour Technol 2001; 80:49-51. [PMID: 11554601 DOI: 10.1016/s0960-8524(01)00057-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Fish flours from Sardinelle (Sardinella aurita) were prepared and tested for protease production by Bacillus subtilis. Protease synthesis was strongly induced when cells were grown in media containing only a combined head and viscera preparation. Sardinelle heads and viscera flour enhanced protease production up to 100% more than commercial peptones. The enhancement could have been due to a high lipid content, which might have contained nutritional factors acting as inducers, since defatting fish meal led to a decrease in protease production.
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Affiliation(s)
- Y Ellouz
- Unité de Technologie Enzymatique et de Microbiologie, Ecole Nationale d'Ingénieurs de Sfax, BPW, Tunisia.
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Bayoudh A, Gharsallah N, Chamkha M, Dhouib A, Ammar S, Nasri M. Purification and characterization of an alkaline protease from Pseudomonas aeruginosa MN1. J Ind Microbiol Biotechnol 2000. [DOI: 10.1038/sj.jim.2900822] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ellouz Y, Ghorbel S, Frikha-Daoud L, Gharsallah N, Gargouri Y, Nasri M. [Preparation and testing of Sardinella peptones: application to lipase production by Staphylococcus sp]. Arch Inst Pasteur Tunis 1999; 76:27-31. [PMID: 14666755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
Production of lipase by Staphylococcus sp. in media containing fish peptones from sardinelle (Sardinella aurita) prepared in the laboratory was studied. Lipase production is strongly affected by lipids present in fish flours. Fish peptones prepared from dIgresed whole flesh was an excellent substrate for lipase production. A comparison of lipase production in media containing fish peptones or high quality commercial peptones indicated that fish peptones enhanced enzyme formation.
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Bashour TT, Saalouke M, Mason DT, Nasri M. Separate myxomas in left atrium and right ventricle. Am Heart J 1996; 132:1295-8. [PMID: 8969591 DOI: 10.1016/s0002-8703(96)90483-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- T T Bashour
- Western Heart Institute, St. Mary's Medical Center, San Francisco, CA 94117, USA
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Barbotin JN, Berry F, Sayadi S, Nasri M, Thomas D. Effect of pH on plasmid stability and catechol 2,3-dioxygenase activity in free and immobilized recombinant E. coli cultures in a two-stage chemostat. Ann N Y Acad Sci 1990; 613:868-73. [PMID: 2076020 DOI: 10.1111/j.1749-6632.1990.tb18279.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- J N Barbotin
- Laboratoire de Technologie Enzymatique, Université de Technologie de Compiègne, France
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Berry F, Sayadi S, Nasri M, Thomas D, Barbotin JN. Immobilized and free cell continuous cultures of a recombinant E. coli producing catechol 2,3-dioxygenase in a two-stage chemostat: improvement of plasmid stability. J Biotechnol 1990; 16:199-209. [PMID: 1366935 DOI: 10.1016/0168-1656(90)90036-b] [Citation(s) in RCA: 12] [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] [Indexed: 11/26/2022]
Abstract
The immobilization of recombinant strains of E. coli W3110/pTG205 in K-carrageenan gel beads improves the plasmid stability during continuous cultures in the absence of selection pressure. Since, xyl E gene (which encodes catechol 2,3-dioxygenase from Pseudomonas putida) transcription is controlled by the trp promoter, the effects of tryptophan (repressor) and 3 beta-indolyl acrylic acid (derepressor) on pTG 205 stability and enzyme production have been studied in both free and immobilized cell cultures. A two-stage continuous culture system running for 150 h is described. In the first stage an immobilized culture is performed in the presence of tryptophan with a significant plasmid stability. The cells released from the gel beads are continuously transferred in the second stage reactor where expression is induced by 3 beta-indolyl acrylic acid. In these conditions an efficient production of catechol 2,3-dioxygenase is observed.
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Affiliation(s)
- F Berry
- Laboratoire de Technologie Enzymatique, Université de Technologie de Compiègne, France
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Affiliation(s)
- J N Barbotin
- Laboratoire de Technologie Enzymatique, Université de Technologie de Compiègne, France
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Sayadi S, Nasri M, Barbotin JN, Thomas D. Effect of environmental growth conditions on plasmid stability, plasmid copy number, and catechol 2,3-dioxygenase activity in free and immobilizedEscherichia coli cells. Biotechnol Bioeng 1989; 33:801-8. [DOI: 10.1002/bit.260330702] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Affiliation(s)
- M Nasri
- Laboratoire de Technologie Enzymatique, Université de Technologie de Compiègne, Compiègne, France
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Berry F, Sayadi S, Nasri M, Barbotin JN, Thomas D. Effect of growing conditions of recombinantE.coli in carrageenan gel beads upon biomasse production and plasmid stability. Biotechnol Lett 1988. [DOI: 10.1007/bf01024712] [Citation(s) in RCA: 22] [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: 10/25/2022]
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Nasri M, Berry F, Sayadi S, Thomas D, Barbotin JN. Stability fluctuations of plasmid-bearing cells: immobilization effects. J Gen Microbiol 1988; 134:2325-31. [PMID: 3075659 DOI: 10.1099/00221287-134-8-2325] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The maintenance of the plasmid vectors pTG201 and pTG206 (which both carry the Pseudomonas putida xylE gene) and pB lambda H3 in Escherichia coli hosts was studied in free and immobilized continuous cultures. pTG201, containing the strong lambda PR promoter, was more quickly lost than plasmid pTG206, containing the tetracycline resistance gene promoter. The instability of pTG201 seems to be related to high expression of the cloned xylE genet. Fluctuations in the proportion of pTG201-containing cells were observed in the free system, suggesting the appearance of adaptive descendants (with and without plasmid) from the initial strains. The loss of plasmid vectors from E. coli cells and the fluctuations in the proportion of plasmid-containing cells could be prevented by immobilizing plasmid-containing bacteria in carrageenan gel beads.
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Affiliation(s)
- M Nasri
- Laboratoire de Technologie Enzymatique, UA Numero 523 du Centre National de la Recherche Scientifique, Université de Technologie de Compiègne, France
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Abstract
The restriction endonuclease PvuII which cleaves the sequence CAGCTG, at the position indicated by the arrow, was found to decrease its substrate specificity in the presence of organic solvents. Thirty-three sites, that we have named PvuII sites, were identified on the nucleotide sequence of pBR322 DNA. The new recognition sequences cleaved in pBR322 DNA, at the positions indicated by the arrows, were shown to be AAGCTG, GAGCTG, CNGCTG, CANCTG, CAGNTG, CAGCNG, CAGCTC and CAGCTT. (TAGCTG and the complementary sequence CAGCTA are not present in pBR322 DNA). From these recognition sequences, we deduced that PvuII activity recognizes and cleaves degenerate sequences which differ from the standard PvuII sequence CAGCTG at only one of the recognition site. Any substitution can occur at any one of the six positions in the hexanucleotide sequence. The optimum incubation medium for PvuII activity was found to be: 10-50 mM Tris-HCl, pH 8.5, 12-15 mM MgCl2, 50 mM NaCl, 10% ethanol + 10% dimethylsulfoxide (DMSO).
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Affiliation(s)
- M Nasri
- Laboratoire de Technologie Enzymatique, UA No.523 du CNRS, Compiegne, France
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39
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Abstract
The effects of several chemical reagents on the activity of the restriction endonucleases PvuII and HindIII were investigated. Carbodiimide, which reacts preferentially with carboxyl groups, was found to inactivate these enzymes. This specific effect could be prevented by Mg2+ cation. pBR322 DNA, which contains PvuII and PvuII* sites and HindIII and HindIII* sites, did not protect the enzymes from the carbodiimide. On the other hand, glutaraldehyde, which reacts primarily with lysine residues, inactivates PvuII and HindIII enzymes. This specific effect could not be prevented by pBR322 DNA. Preincubation with high concentrations of N-ethylmaleimide, which reacts with sulfhydryl groups, caused slight inhibition of PvuII activity, but had no effect on the activity of HindIII enzyme. The effects of glutaraldehyde, carbodiimide, and N-ethylmaleimide on other restriction endonucleases were also investigated. Restriction endonucleases PvuII and HindIII were immobilized by covalent coupling to various insoluble carriers. Both immobilized enzymes retained partial enzyme activities, when immobilized through phenolic groups and were stable for at least two months.
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Affiliation(s)
- M Nasri
- Laboratoire de Technologie Enzymatique, UA N. 523 du CNRS, Université de technologie de Compiègne, France
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40
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Sayadi S, Nasri M, Berry F, Barbotin JN, Thomas D. Effect of temperature on the stability of plasmid pTG201 and productivity of xylE gene product in recombinant Escherichia coli: development of a two-stage chemostat with free and immobilized cells. J Gen Microbiol 1987; 133:1901-8. [PMID: 3312486 DOI: 10.1099/00221287-133-7-1901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The effect of temperature on the stability of pTG201, a plasmid carrying the xylE gene (which encodes catechol 2,3-dioxygenase from Pseudomonas putida), and the production of catechol 2,3-dioxygenase in free and immobilized Escherichia coli during continuous culture have been studied at various temperatures. Immobilization of cells increased the stability of pTG201 considerably, even under conditions when expression of the xylE product was enhanced. Since xylE transcription was controlled by the lambda PR promoter and cI857 repressor, increasing derepression temperatures increased catechol 2,3-dioxygenase productivity and decreased pTG201 stability. A two-stage continuous culture system to overcome the impact of the high-level expression of the xylE gene on the stability of pTG201 is described. In the first stage, immobilized cells were grown in the repressed state in order to prevent loss of pTG201, whereas in the second stage, cultures were maintained in the derepressed state.
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Affiliation(s)
- S Sayadi
- Laboratoire de Technologie Enzymatique, UA no. 523 du CNRS, Université de Technologie de Compiègne, France
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41
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Nasri M, Sayadi S, Barbotin JN, Dhulster P, Thomas D. Influence of immobilization on the stability of pTG201 recombinant plasmid in some strains of Escherichia coli. Appl Environ Microbiol 1987; 53:740-4. [PMID: 3555337 PMCID: PMC203748 DOI: 10.1128/aem.53.4.740-744.1987] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The stability of pTG201 plasmid was examined by continuous culture in three genetically different Escherichia coli hosts. Two types of experiment were carried out, one with free cells and one with immobilized cells. When cells were cultivated in free continuous culture in the absence of antibiotic selection, the plasmid was maintained with various degrees of stability in the three host organisms. By contrast, in continuous culture with immobilized cells, plasmid pTG201 was stably maintained in the three strains. We showed that the increase in pTG201 stability in immobilized cells is due neither to plasmid transfer between immobilized cells nor to an increase of the plasmid copy number of immobilized cells. We also showed that plasmid-free cells, when coimmobilized and grown in competition with plasmid-containing cells, cannot overrun the culture.
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42
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Abstract
Under the standard reaction conditions, the restriction endonuclease HindIII cleaves double-stranded DNA, within the recognition sequence--A/AGCTT--at the position indicated by the arrow. In the presence of dimethyl sulfoxide the substrate specificity of this enzyme is reduced and cleavages occur at additional sites. We have determined the secondary sites in pBR322 DNA recognized by HindIII endonuclease under relaxed conditions and found that it cleaves the hexanucleotides: G/AGCTT, A/GGCTT, A/TGCTT, A/ATCTT, A/AGCCT, A/AGCAT, A/AGCGT, A/AGCTC, at the positions indicated by the arrows, producing fragments with cohesive ends.
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43
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Abstract
The substrate specificity of PvuII endonuclease is relaxed in the presence of dimethyl sulfoxide. The new recognition sequences cleaved in pBR322 DNA have been found to be CCGCTG, CATCTG, CAGATG, CAGGTG and CAGCGG.
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Le Moullec JM, Akusjärvi G, Stålhandske P, Pettersson U, Chambraud B, Gilardi P, Nasri M, Perricaudet M. Polyadenylic acid addition sites in the adenovirus type 2 major late transcription unit. J Virol 1983; 48:127-34. [PMID: 6136617 PMCID: PMC255329 DOI: 10.1128/jvi.48.1.127-134.1983] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The cytoplasmic mRNAs which are transcribed from the major late adenovirus promoter can be arranged into five 3'-coterminal families, L1 to L5. We have defined the polyadenylation sites of the mRNAs that belong to the five families at the nucleotide level. From the results, the following conclusions can be made. (i) The hexanucleotide sequence AAUAAA is present at the 3' end of all late adenovirus type 2 mRNAs and precedes the site of polyadenylation by 12 to 30 nucleotides. (ii) Between one and three A residues are present in the genomic sequence at the polyadenylation site. (iii) A sequence with the composition (T)n (A)p (T)q (n, p, q greater than or equal to 1) is found 4 to 24 nucleotides beyond all the adenovirus-specific polyadenylation sites except the 3'-coterminal family L4. This sequence is also found beyond many cellular polyadenylation sites. (iv) The L1 and L2 polyadenylation sites are very similar in structure. The other polyadenylation sites show no apparent sequence relationship, except for the hexanucleotide sequence.
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Abstract
Five cases of hypoplasia of the descending thoracic and/or abdominal aorta as a rare cause of hypertension are presented. Similarities and dissimilarities between this lesion and classical coarctation of the aorta are discussed. Management of the resulting hypertension is usually medical, as surgical therapy is extremely difficult due to the diffuse involvement of the entire aorta and its branches.
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