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Indexation 571 : Physiologie et sujets voisins
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Titre : 12 [Douze] clés pour la biologie Type de document : texte imprimé Auteurs : Noel, Emile, Auteur Editeur : Belin Année de publication : 1985 Importance : 191 p. Format : 24 cm. ISBN/ISSN/EAN : 978-2-7011-0607-6 Langues : Français (fre) Index. décimale : 571 Physiologie et sujets voisins Résumé : Le monde du vivant, c'est-a-dire tout ce qui bouge, qui vit et qui meurt, est extraordinaire à la fois par la diversité de ses formes et la constance de ses individualités: qu'est-ce qui diffère plus d'un éléphant qu'une amibe, mais qu'est-ce qui ressemble plus à un éléphant qu'un petit éléphant? Cette université et cette diversité du monde du vivant s'expliquent par un concept unificateur: tous les êtres vivants sont constitués de cellules contenant l'ADN, dont la constitution détermine les caractéristiques de l'individu. Les douze clés pour la biologie, une série d'entretiens diffusés sur France culture entre Emile Noêl et le biologiste Jean Tavlitzki, montrent comment les principes de la biologie moléculaire éclairent l'évolution des êtres vivants, les maladies qui les affectent, les systèmes de défense de l'individu, ainsi que des sujets aussi polémiques que les influences de l'inné et de l'acquis sur notre comportement. 12 [Douze] clés pour la biologie [texte imprimé] / Noel, Emile, Auteur . - Belin, 1985 . - 191 p. ; 24 cm.
ISBN : 978-2-7011-0607-6
Langues : Français (fre)
Index. décimale : 571 Physiologie et sujets voisins Résumé : Le monde du vivant, c'est-a-dire tout ce qui bouge, qui vit et qui meurt, est extraordinaire à la fois par la diversité de ses formes et la constance de ses individualités: qu'est-ce qui diffère plus d'un éléphant qu'une amibe, mais qu'est-ce qui ressemble plus à un éléphant qu'un petit éléphant? Cette université et cette diversité du monde du vivant s'expliquent par un concept unificateur: tous les êtres vivants sont constitués de cellules contenant l'ADN, dont la constitution détermine les caractéristiques de l'individu. Les douze clés pour la biologie, une série d'entretiens diffusés sur France culture entre Emile Noêl et le biologiste Jean Tavlitzki, montrent comment les principes de la biologie moléculaire éclairent l'évolution des êtres vivants, les maladies qui les affectent, les systèmes de défense de l'individu, ainsi que des sujets aussi polémiques que les influences de l'inné et de l'acquis sur notre comportement. Exemplaires(1)
Cote Rayonnage Support Disponibilité 571.1 NOE 13 Consultation Exclu du prêt
Titre : 900 Qcm de biologie cellulaire, histologie et embryologie : l'entrainement clef pour le concours ,commentaires et conseils de l'enseignement Type de document : texte imprimé Auteurs : Ghorbal, Mounaïm, Auteur Mention d'édition : 3 e éd. Editeur : Ellipses Année de publication : 2015 Importance : 306 p. Format : 26 cm. ISBN/ISSN/EAN : 978340008038 Langues : Français (fre) Index. décimale : 571 Physiologie et sujets voisins Résumé : Cet ouvrage permet l'entraînement à l'épreuve de QCM, le contrôle des connaissances et l'évaluation du degré de compréhension. II est destiné aux étudiants qui préparent les concours d'accès aux études médicales (médecine, pharmacie, odontologie, maïeutique) et plus généralement aux étudiants du premier cycle des sciences de la vie. Les domaines abordés traitent de tous les thèmes présents au programme de l'UE2 de la première année des études de santé (PACES) en biologie cellulaire, histologie et embryologie.
Les questions sont soit des QCM de cours indépendants, soit des problèmes sous forme de QCM. Les réponses commentées des QCM se trouvent à la fin de chaque chapitre.900 Qcm de biologie cellulaire, histologie et embryologie : l'entrainement clef pour le concours ,commentaires et conseils de l'enseignement [texte imprimé] / Ghorbal, Mounaïm, Auteur . - 3 e éd. . - Ellipses, 2015 . - 306 p. ; 26 cm.
ISSN : 978340008038
Langues : Français (fre)
Index. décimale : 571 Physiologie et sujets voisins Résumé : Cet ouvrage permet l'entraînement à l'épreuve de QCM, le contrôle des connaissances et l'évaluation du degré de compréhension. II est destiné aux étudiants qui préparent les concours d'accès aux études médicales (médecine, pharmacie, odontologie, maïeutique) et plus généralement aux étudiants du premier cycle des sciences de la vie. Les domaines abordés traitent de tous les thèmes présents au programme de l'UE2 de la première année des études de santé (PACES) en biologie cellulaire, histologie et embryologie.
Les questions sont soit des QCM de cours indépendants, soit des problèmes sous forme de QCM. Les réponses commentées des QCM se trouvent à la fin de chaque chapitre.Réservation
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Exemplaires(2)
Cote Rayonnage Support Disponibilité 571.84 GHO/2 1 Livre Disponible 571.84 GHO/3 1 Livre Disponible Accumulation and elimination kinetics of dietary endosulfan in atlantic salmon (salmo salar) / Chris N. Glover
Titre : Accumulation and elimination kinetics of dietary endosulfan in atlantic salmon (salmo salar) Type de document : texte imprimé Auteurs : Chris N. Glover, Auteur Importance : pp. 104-111 Langues : Anglais (eng) Index. décimale : 571 Physiologie et sujets voisins Résumé : The carry-over of dietary endosulfan to (he fillet of farmed Atlantic salmon was studied. The uptake and elimination rale constants of the a and (3 isoform of endosulfan were determined in seawatcr adapted Atlantic salmon (initial weigh 173 ± 25 g) fed on endosulfan enriched diets (724 and 315(jLgkg-1 for a-and p-endosiilfan, respectively) for 92 days, followed by a 56 days depuration period with feeding on control diets (<0.3 j-ig kg-1 endosulfan). The accumulation of the toxic metabolite endosulfan sulphate, which was not detected (<0.5 ug kg-1) in the experimental feeds, was also determined. Dietary pl-endosulfan was more persistent than a-endosulfan as demonstrated by a higher uptake (41 ±8% vs. 21 ±2%) and lowcrelimination(26±2 x 10~3day~' vs.40± 1 x 10~3day~1)raieconstants,andahigherbiomagnificationfactor(0.lO±0.026vs.0.05±0.003, p<0.05). Based on the decrease in diasiercometric factor over time, biotransformation was estimated to account for at least 50% of the endosulfan elimination. The formation of the metabolite endosulfan sulphate comprised a maximum 1.2% of the total accumulation of endosulfan. Using a simple one-comparlmcntal model and the experimentally-determined rate constants, it was predicted that only dietary concentration higher than 7.5 mg kg-1 would cause the estimated maximum residue level (MRL) in fillet of 0.47 mg kg to be exceeded. Model estimations also predict that current EU maximum permitted levels in fish feeds (0.005 mg kg-1 would give fillet concentrations that arc under the detection limit (0.3 jxg kg-1), which is in agreement with the general absence of endosulfan in monitored farmed Atlantic salmon. Accumulation and elimination kinetics of dietary endosulfan in atlantic salmon (salmo salar) [texte imprimé] / Chris N. Glover, Auteur . - [s.d.] . - pp. 104-111.
Langues : Anglais (eng)
Index. décimale : 571 Physiologie et sujets voisins Résumé : The carry-over of dietary endosulfan to (he fillet of farmed Atlantic salmon was studied. The uptake and elimination rale constants of the a and (3 isoform of endosulfan were determined in seawatcr adapted Atlantic salmon (initial weigh 173 ± 25 g) fed on endosulfan enriched diets (724 and 315(jLgkg-1 for a-and p-endosiilfan, respectively) for 92 days, followed by a 56 days depuration period with feeding on control diets (<0.3 j-ig kg-1 endosulfan). The accumulation of the toxic metabolite endosulfan sulphate, which was not detected (<0.5 ug kg-1) in the experimental feeds, was also determined. Dietary pl-endosulfan was more persistent than a-endosulfan as demonstrated by a higher uptake (41 ±8% vs. 21 ±2%) and lowcrelimination(26±2 x 10~3day~' vs.40± 1 x 10~3day~1)raieconstants,andahigherbiomagnificationfactor(0.lO±0.026vs.0.05±0.003, p<0.05). Based on the decrease in diasiercometric factor over time, biotransformation was estimated to account for at least 50% of the endosulfan elimination. The formation of the metabolite endosulfan sulphate comprised a maximum 1.2% of the total accumulation of endosulfan. Using a simple one-comparlmcntal model and the experimentally-determined rate constants, it was predicted that only dietary concentration higher than 7.5 mg kg-1 would cause the estimated maximum residue level (MRL) in fillet of 0.47 mg kg to be exceeded. Model estimations also predict that current EU maximum permitted levels in fish feeds (0.005 mg kg-1 would give fillet concentrations that arc under the detection limit (0.3 jxg kg-1), which is in agreement with the general absence of endosulfan in monitored farmed Atlantic salmon. Exemplaires(0)
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Titre : Accumulation and elimination of methylmercury in atlantic cod (gadus morhua L.) following dietary exposure Type de document : texte imprimé Auteurs : Amlund, Heidi, Auteur Importance : pp. 323-330 Langues : Anglais (eng) Index. décimale : 571 Physiologie et sujets voisins Résumé : Methylmercury is known to bioaccumulate and biomagnify up the marine food chain. Fish from high levels of the marine food chain may contain relatively high concentrations of mercury, and most (>70%) of the mercury found in muscle is methylmercury. In aquaculture, marine protein (mainly fishmeal) is the dominant source of methylmercury. and this raises some concern with regards to fish welfare and consumer safety. A dietary exposure study, including a depuration period, was earned out in order to study the accumulation and elimination of methylmercury in Atlantic cod (Gadiis morhua L.}. and to estimate the transfer of methylmercury from feed to fish. Fish were sampled throughout a three month exposure period and a three month depuration period. Muscle samples were fractionated into a protein and a lipid fraction by lipid extraction using methanol and chloroform. Mercury and methylmercury were determined by inductively coupled plasma mass spectrometry (1CPMS) and gas chromatography-inductively coupled plasma mass spectromctry (GC-ICPMS), respectively. A continuous accumulation of methylmercury, after a lag period of 10 days, was observed in muscle tissue during the three months exposure to methylmercury (0.95 ±0.03 jxg Hg/g feed. n = 6). After three months, the final concentration in muscle was 0.38±0.04/xg Hg/gww (n = 6), where methylmercury constituted 90-95% of the mercury present. The elimination of methylmercury from muscle was slow and incomplete (within the three months of depuration) with an estimated elimination half-life (/t .-2) of 377 days. The transfer of methylmercury from feed to Atlantic cod, described by the estimated absorption efficiency, was 38%. In muscle more than 99% of the mercury was found in the protein fraction. These results suggest that Atlantic cod readily takes up dietary methylmercury, which is efficiently accumulated into muscle, where it is incorporated into larger peptides or proteins. Comparable results were found for Atlantic salmon (Salmo salar L.). After three months of exposure to dietary methylmercury the final concentration in muscle was 0.33 ± 0.01 jxg Hg/g ww (n - 3), where nearly all (>99%) mercury was found in the protein traction. This further supports that methyl mercury is accumulated in fish muscle, where it is incorporated into larger peptides or proteins. Accumulation and elimination of methylmercury in atlantic cod (gadus morhua L.) following dietary exposure [texte imprimé] / Amlund, Heidi, Auteur . - [s.d.] . - pp. 323-330.
Langues : Anglais (eng)
Index. décimale : 571 Physiologie et sujets voisins Résumé : Methylmercury is known to bioaccumulate and biomagnify up the marine food chain. Fish from high levels of the marine food chain may contain relatively high concentrations of mercury, and most (>70%) of the mercury found in muscle is methylmercury. In aquaculture, marine protein (mainly fishmeal) is the dominant source of methylmercury. and this raises some concern with regards to fish welfare and consumer safety. A dietary exposure study, including a depuration period, was earned out in order to study the accumulation and elimination of methylmercury in Atlantic cod (Gadiis morhua L.}. and to estimate the transfer of methylmercury from feed to fish. Fish were sampled throughout a three month exposure period and a three month depuration period. Muscle samples were fractionated into a protein and a lipid fraction by lipid extraction using methanol and chloroform. Mercury and methylmercury were determined by inductively coupled plasma mass spectrometry (1CPMS) and gas chromatography-inductively coupled plasma mass spectromctry (GC-ICPMS), respectively. A continuous accumulation of methylmercury, after a lag period of 10 days, was observed in muscle tissue during the three months exposure to methylmercury (0.95 ±0.03 jxg Hg/g feed. n = 6). After three months, the final concentration in muscle was 0.38±0.04/xg Hg/gww (n = 6), where methylmercury constituted 90-95% of the mercury present. The elimination of methylmercury from muscle was slow and incomplete (within the three months of depuration) with an estimated elimination half-life (/t .-2) of 377 days. The transfer of methylmercury from feed to Atlantic cod, described by the estimated absorption efficiency, was 38%. In muscle more than 99% of the mercury was found in the protein fraction. These results suggest that Atlantic cod readily takes up dietary methylmercury, which is efficiently accumulated into muscle, where it is incorporated into larger peptides or proteins. Comparable results were found for Atlantic salmon (Salmo salar L.). After three months of exposure to dietary methylmercury the final concentration in muscle was 0.33 ± 0.01 jxg Hg/g ww (n - 3), where nearly all (>99%) mercury was found in the protein traction. This further supports that methyl mercury is accumulated in fish muscle, where it is incorporated into larger peptides or proteins. Exemplaires(0)
Disponibilité aucun exemplaire
Titre : Action mechanisms of petroleum hydrocarbons present in waters impacted by an oil spill on the genetic material of allium cepa root cells Type de document : texte imprimé Auteurs : Morias Leme, Daniela, Auteur Importance : pp. 214-219 Langues : Anglais (eng) Index. décimale : 571 Physiologie et sujets voisins Résumé : Chromosomal aberration (CA) assays have been widely used, not only to assess the genotoxic effects of chemical agents, but also to evaluate their action mechanisms on the genetic material of exposed organisms. This is of particular interest, since such analyses provide a better knowledge related to the action of these agents on DNA. Among test organisms, Allium cepa is an outstanding species due to its sensitivity and suitable chromosomal features, which are essential for studies on chromosomal damage or disturbances in cell cycle. The goal of the present study was to analyze the action mechanisms of chemical agents present in petroleum polluted waters. Therefore, CA assay was carried out in A. cepa meristematic cells exposed to the Cuaeca river waters, located in the city of Sao Sebastiao, SP, Brazil, which had its waters impacted by an oil pipeline leak. Analyses of the aberration types showed clastogenic and aneugenic effects for the roots exposed to the polluted waters from Guaeca river, besides the induction of cell death. Probably all the observed effects were induced by the petroleum hydrocarbons derived from the oil leakage. Action mechanisms of petroleum hydrocarbons present in waters impacted by an oil spill on the genetic material of allium cepa root cells [texte imprimé] / Morias Leme, Daniela, Auteur . - [s.d.] . - pp. 214-219.
Langues : Anglais (eng)
Index. décimale : 571 Physiologie et sujets voisins Résumé : Chromosomal aberration (CA) assays have been widely used, not only to assess the genotoxic effects of chemical agents, but also to evaluate their action mechanisms on the genetic material of exposed organisms. This is of particular interest, since such analyses provide a better knowledge related to the action of these agents on DNA. Among test organisms, Allium cepa is an outstanding species due to its sensitivity and suitable chromosomal features, which are essential for studies on chromosomal damage or disturbances in cell cycle. The goal of the present study was to analyze the action mechanisms of chemical agents present in petroleum polluted waters. Therefore, CA assay was carried out in A. cepa meristematic cells exposed to the Cuaeca river waters, located in the city of Sao Sebastiao, SP, Brazil, which had its waters impacted by an oil pipeline leak. Analyses of the aberration types showed clastogenic and aneugenic effects for the roots exposed to the polluted waters from Guaeca river, besides the induction of cell death. Probably all the observed effects were induced by the petroleum hydrocarbons derived from the oil leakage. Exemplaires(0)
Disponibilité aucun exemplaire
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