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Auteur Amina Bramki |
Documents disponibles écrits par cet auteur (3)
Affiner la recherche Interroger des sources externesEtude de la radioactivité naturelle et artificielle dans les fertilisants et le sol de l’Est algérien par spectrométrie gamma. / Amina Bramki
Titre : Etude de la radioactivité naturelle et artificielle dans les fertilisants et le sol de l’Est algérien par spectrométrie gamma. Type de document : texte imprimé Auteurs : Amina Bramki, Auteur ; Mourad Ramdhane, Directeur de thèse ; Fatima Benrachi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 170 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : La spectroscopie gamma concentrations d'activité Fertilisant échantillons de sol le risque radiologique facteur de risque excessif de cancer à vie gamma spectroscopy activity concentrations fertilizer soil samples radiological risk excessive risk factor for lifetime cancer المطيافية غاما تركيزات النشاط السماد عينات التربة المخاطر الإشعاعية عامل خطر الإصابة بالسرطان خلال العمر Index. décimale : 530 Physique Résumé : The aim of this study is to evaluate the level of natural radioactivity in seven fertilizers from two different regions, Constantine and Mila in Algeria, and in fertilized and unfertilized soil samples collected at different depths in two pilot and private Algerian farms, from El-Athmania and Ferdjioua, Mila, respectively. Using gamma spectroscopy with a hyper-pure germanium detector (HPGe), a low background configuration and high-resolution.
The activity concentration ranges of 226Ra, 232Th and 40K in the soil samples were found at 23.72 ± 2.37 «-ÿ 67.72 ± 7.77, 26.45 ± 0.78 <-ÿ 28.70 ± 0.90 and 178.5 ± 5.64 <-ÿ 290.1 ± 10.5 Bq.kg"" , respectively. The results of this current study have been compared with the world mean values of 35, 30 and 400 Bq.kg""1, respectively, specified by the UNSCEAR (2000). The artificial radionuclide, 137Cs was found in all measured soil samples and its mean activity was 2.66 Bq.Kg'1. Additionally, the vertical distribution of 137Cs soil activity concentrations was studied in this current study. It can assumed from the results the decrease of 137Cs as a function of depth. i Concerning radiological risk to human health, the absorbed gamma dose rate (D) in air is estimated to be between 36.23 ± 0.4 and 58.78 ± 2.2 nGy.h'1; the outdoor annual effective dose equivalent (DE) was evaluated to vary from 44.44 ± 0.4 to 69.88 ± 2.7 pSv.y'1, with the arithmetic mean value of 61.43 ± 33.23 pSv.y""1, which is comparable to the worldwide effective dose of 70 pSv.y""1. Also, the Raeq, Hex, Hm and Iy values for all soil samples in this work are lower than the accepted safety limit of 370 Bq.kg'1 and below the unit limit, respectively. The results indicate that the radiation hazard of primordial radionuclides in all soil samples of the regions studied in this current work is not significant. On the other hand, the mean value of the lifetime cancer risk factor for fertilizers studied is 9.45 x 10""4. Two (2) sampling points (FM and TSP) have ELCR values greater than the worldwide average value. These results show that lifetime cancer risk from exposure to these fertilizers for up to 70 years is high in both locations. Therefore, subsequent use of this product for agriculture or for soil remediation studies and other purposes should be discouraged.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BRA7331.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10981 Etude de la radioactivité naturelle et artificielle dans les fertilisants et le sol de l’Est algérien par spectrométrie gamma. [texte imprimé] / Amina Bramki, Auteur ; Mourad Ramdhane, Directeur de thèse ; Fatima Benrachi, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 170 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : La spectroscopie gamma concentrations d'activité Fertilisant échantillons de sol le risque radiologique facteur de risque excessif de cancer à vie gamma spectroscopy activity concentrations fertilizer soil samples radiological risk excessive risk factor for lifetime cancer المطيافية غاما تركيزات النشاط السماد عينات التربة المخاطر الإشعاعية عامل خطر الإصابة بالسرطان خلال العمر Index. décimale : 530 Physique Résumé : The aim of this study is to evaluate the level of natural radioactivity in seven fertilizers from two different regions, Constantine and Mila in Algeria, and in fertilized and unfertilized soil samples collected at different depths in two pilot and private Algerian farms, from El-Athmania and Ferdjioua, Mila, respectively. Using gamma spectroscopy with a hyper-pure germanium detector (HPGe), a low background configuration and high-resolution.
The activity concentration ranges of 226Ra, 232Th and 40K in the soil samples were found at 23.72 ± 2.37 «-ÿ 67.72 ± 7.77, 26.45 ± 0.78 <-ÿ 28.70 ± 0.90 and 178.5 ± 5.64 <-ÿ 290.1 ± 10.5 Bq.kg"" , respectively. The results of this current study have been compared with the world mean values of 35, 30 and 400 Bq.kg""1, respectively, specified by the UNSCEAR (2000). The artificial radionuclide, 137Cs was found in all measured soil samples and its mean activity was 2.66 Bq.Kg'1. Additionally, the vertical distribution of 137Cs soil activity concentrations was studied in this current study. It can assumed from the results the decrease of 137Cs as a function of depth. i Concerning radiological risk to human health, the absorbed gamma dose rate (D) in air is estimated to be between 36.23 ± 0.4 and 58.78 ± 2.2 nGy.h'1; the outdoor annual effective dose equivalent (DE) was evaluated to vary from 44.44 ± 0.4 to 69.88 ± 2.7 pSv.y'1, with the arithmetic mean value of 61.43 ± 33.23 pSv.y""1, which is comparable to the worldwide effective dose of 70 pSv.y""1. Also, the Raeq, Hex, Hm and Iy values for all soil samples in this work are lower than the accepted safety limit of 370 Bq.kg'1 and below the unit limit, respectively. The results indicate that the radiation hazard of primordial radionuclides in all soil samples of the regions studied in this current work is not significant. On the other hand, the mean value of the lifetime cancer risk factor for fertilizers studied is 9.45 x 10""4. Two (2) sampling points (FM and TSP) have ELCR values greater than the worldwide average value. These results show that lifetime cancer risk from exposure to these fertilizers for up to 70 years is high in both locations. Therefore, subsequent use of this product for agriculture or for soil remediation studies and other purposes should be discouraged.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BRA7331.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10981 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BRA/7331 BRA/7331 Thèse Bibliothèque principale Thèses Disponible
Titre : Isolement et identification de souches d’Aspergillus de différents écosystèmes productrices de substances à activité antibactérienne et caractérisation partielle des molécules élaborées. Type de document : texte imprimé Auteurs : Amina Bramki, Auteur ; L. Dehimat, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 150 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
BiologieTags : Biochimie et Biologie Cellulaire et Moléculaire: Biochimie Appliquée Aspergillus écosystèmes particuliers activité antibactérienne molécules bioactives antibacterial activity bioactive molecules نظم بيتية خاصة نشاط مضاد للبكتيري جزيئات نشطة حيويا Index. décimale : 570 Sciences de la vie. Biologie Résumé :
In the interest of discovering new antibiotic molecules, the antibacterial activity of ten fungal species of Aspergillus genus isolated from soils taken from particular ecosystems (Laghouat and Teleghma) was sought against six bacterial strains; three with Gram + staining and three with Gram - staining. The results of the demonstration by different techniques (cylinders, disks and wells) have allowed us to select for the rest of our work three fungal species (A. quadrilineatus, A. niveus and A. wentii) that have a considerable antibacterial effect, and which are not well developed by researchers in the field of secondary metabolites with antibacterial activity. In order to optimize the extraction conditions of the bioactive molecules of these strains, five solvents in different polarities were tested, of which chloroform turned out to be the best one. After the selection of this solvent, four culture media of various compositions were used to determine the most adequate medium for the production of antibacterial substances. The results show that the nature of the components of these media (carbon source, nitrogen, and mineral source) greatly influences the production capacity of antibiotics in fungi. Moreover, the study of the stability of bioactive molecules reveals that the majority of active extracts maintain their activity after heat treatment (up to 100 °C) and exposure to light. In addition, the separation of antibacterial molecules by chromatographic techniques allowed us to select an active fraction. After the analysis of this fraction by UPLCMS, 24 peaks corresponding to 24 molecules were revealed with determination of their chemical characteristics: m/z ratios, formulas, retention time and intensities.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/biologie/BRA7540.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11380 Isolement et identification de souches d’Aspergillus de différents écosystèmes productrices de substances à activité antibactérienne et caractérisation partielle des molécules élaborées. [texte imprimé] / Amina Bramki, Auteur ; L. Dehimat, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 150 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Biochimie et Biologie Cellulaire et Moléculaire: Biochimie Appliquée Aspergillus écosystèmes particuliers activité antibactérienne molécules bioactives antibacterial activity bioactive molecules نظم بيتية خاصة نشاط مضاد للبكتيري جزيئات نشطة حيويا Index. décimale : 570 Sciences de la vie. Biologie Résumé :
In the interest of discovering new antibiotic molecules, the antibacterial activity of ten fungal species of Aspergillus genus isolated from soils taken from particular ecosystems (Laghouat and Teleghma) was sought against six bacterial strains; three with Gram + staining and three with Gram - staining. The results of the demonstration by different techniques (cylinders, disks and wells) have allowed us to select for the rest of our work three fungal species (A. quadrilineatus, A. niveus and A. wentii) that have a considerable antibacterial effect, and which are not well developed by researchers in the field of secondary metabolites with antibacterial activity. In order to optimize the extraction conditions of the bioactive molecules of these strains, five solvents in different polarities were tested, of which chloroform turned out to be the best one. After the selection of this solvent, four culture media of various compositions were used to determine the most adequate medium for the production of antibacterial substances. The results show that the nature of the components of these media (carbon source, nitrogen, and mineral source) greatly influences the production capacity of antibiotics in fungi. Moreover, the study of the stability of bioactive molecules reveals that the majority of active extracts maintain their activity after heat treatment (up to 100 °C) and exposure to light. In addition, the separation of antibacterial molecules by chromatographic techniques allowed us to select an active fraction. After the analysis of this fraction by UPLCMS, 24 peaks corresponding to 24 molecules were revealed with determination of their chemical characteristics: m/z ratios, formulas, retention time and intensities.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/biologie/BRA7540.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11380 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BRA/7540 BRA/7540 Thèse Bibliothèque principale Thèses Disponible
Titre : Mesure par spectrométrie gamma de la radioactivité naturelle présente dans des échantillons de l’environnement Type de document : texte imprimé Auteurs : Amina Bramki, Auteur ; M. Ramdhane, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2011 Importance : 127 f. Format : 31 cm Note générale : Magister
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : radioactivité naturelle matière organique et inorganique radio nucléides activité spécifique échelle mondiale spectrométrie gamma. Index. décimale : 530 Physique En ligne : ../theses/physique/BRA6050.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=5964 Mesure par spectrométrie gamma de la radioactivité naturelle présente dans des échantillons de l’environnement [texte imprimé] / Amina Bramki, Auteur ; M. Ramdhane, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2011 . - 127 f. ; 31 cm.
Magister
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : radioactivité naturelle matière organique et inorganique radio nucléides activité spécifique échelle mondiale spectrométrie gamma. Index. décimale : 530 Physique En ligne : ../theses/physique/BRA6050.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=5964 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BRA/6050 BRA/6050 Thèse Bibliothèque principale Thèses Disponible
