Log in

Relevant bibliographies by topics / Relation structure/activité

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Relation structure/activité'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 January 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Relation structure/activité.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Relation structure/activité"

1

Bryskier, A. "Relation activité-structure des agents antibactériens." Antibiotiques 8, no. 3 (September 2006): 136–46. http://dx.doi.org/10.1016/s1294-5501(06)70813-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Fagart, J., G. M. Pinon, and M. E. Rafestin-Oblin. "Agonistes et antagonistes minéralocorticoïdes. Relation structure–activité." Annales de Cardiologie et d'Angéiologie 53, no. 3 (June 2004): 154–57. http://dx.doi.org/10.1016/j.ancard.2004.02.018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Deniau, Anne-Laure, Damien Le Bot, Paul Mosset, and Alain B. Legrand. "Activités antitumorale et antimétastasique des alkylglycérols naturels : relation structure-activité." Oléagineux, Corps gras, Lipides 17, no. 4 (July 2010): 236–37. http://dx.doi.org/10.1051/ocl.2010.0319.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Calas, M., J. Bompart, L. Giral, and G. Grassy. "Relation structure—activité dans la série des quinolones." European Journal of Medicinal Chemistry 26, no. 3 (April 1991): 279–90. http://dx.doi.org/10.1016/0223-5234(91)90060-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Véron, Jacques. "Activité féminine et structures familiales. Quelle dépendance ?" Population Vol. 43, no. 1 (January 1, 1988): 103–20. http://dx.doi.org/10.3917/popu.p1988.43n1.0120.

Full text

Abstract:

Résumé Véron Jacques.— Activité féminine et structures familiales. Quelle dépendance ? De la hiérarchie des taux d'activité des femmes selon la situation familiale, de la moindre fécondité des femmes actives ou de la simultanéité entre transformation des structures familiales et explosion de l'activité féminine, est fréquemment inférée une relation de dépendance entre comportements sur le marché du travail et attitudes à l'égard du mariage ou de la famille. L'utilisation de données françaises conduit à nier l'existence d'une telle relation. Les recensements de 1962 et 1982 encadrent en France une période de changements remarquables : baisse de la nuptialité et de la fécondité; hausse de la divortialité d'une part, croissance de l'activité et disparition du « cycle traditionnel » d'activité d'autre part. Aucune relation de dépendance stricte ne peut être établie entre ces deux ordres de phénomènes. Le recours à une structure type montre qu'en l'absence de changements familiaux, les femmes auraient été, aujourd'hui, presque aussi souvent actives. Un modèle élémentaire de transferts (fictifs) entre sous-populations (des femmes mariées, fécondes et inactives vers les femmes célibataires, sans enfant et actives, par exemple) prouve qu'il ne saurait exister plus qu'une faible dépendance, quelle qu'en soit le sens, entre changements familiaux et désir accru d'exercer une profession.

APA, Harvard, Vancouver, ISO, and other styles

6

Joly, S., J. Saussey, A. Janin, F. Thibaut-Starzyk, and JC Lavalley. "Influence de la structure sur la relation acidité-activité dans les zéolites acides." Journal de Chimie Physique 94 (1997): 1838–47. http://dx.doi.org/10.1051/jcp/1997941838.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Storme, Matthias E. "The Foundations of Private Law in a Multilevel Structure: Balancing, Distribution of Lawmaking Power, and Other Constitutional Issues." European Review of Private Law 20, Issue 1 (February 1, 2012): 237–53. http://dx.doi.org/10.54648/erpl2012013.

Full text

Abstract:

Abstract: This contribution is, first of all, a reflection on the distribution of power in relation to private law in the context of multilevel government, on the one hand, and relativization of this power by a so-called law market, on the other hand. It is also a reflection on the notion that law is a balancing activity (balancing values or interests). The author argues in favour of maintaining a normative perspective instead of recognizing as law everything that pretends to be law. He also argues in favour of the classical separation of powers and discusses the legitimacy of lawmaking by the different branches of power. Notions like pluralism and diversity tend to hide political choices that undermine classical values as equality before the law and the application of the law of the land. After an analysis of the arguments in favour of or against a centralization of lawmaking power on the European level, the author argues in favour of a reversal of the actual principles of division of power between the European Union and the Member States and thus in favour of a European Civil Code (ECC) that may be amended by the Member States. Résumé: Notre contribution constitue d'abord une réflexion sur la distribution des pouvoirs en matière de droit privé dans un contexte de gouvernance à plusieurs niveaux d'une part et de relativisation de ce pouvoir par un soi-disant marché du droit d'autre part. C'est aussi une réflexion sur l'idée du droit comme activité de pesage (de valeurs ou intérêts). L'auteur défend le maintien d'une perspective normative plutôt que de reconnaître comme droit tout ce qui prétend l'âtre. Il défend une conception classique de séparation de pouvoirs et discute la légitimité de la production de normes juridiques par les différentes instances. Des notions comme pluralisme ou diversité tendent plutôt à cacher des choix politiques qui sapent des valeurs classiques comme l'égalité devant la loi ou l'application de la loi du territoire. Après une analyse des différents arguments pour et contre une centralisation du pouvoir de légiférer en droit privé au niveau européen, l'auteur défend une inversion des principes actuels de division de pouvoir entre l'Union et ses Etats membres, et dès lors en faveur d'un Code Civil Européen laissant aux Etats membres le pouvoir d'y apporter des variations.

APA, Harvard, Vancouver, ISO, and other styles

8

Galetto, A., W. Lopez, and E. Baumeister. "Compétitivité de la production laitière au Nicaragua : analyse de la productivité et des coûts dans les élevages laitiers et à viande de la région de Matagalpa." Revue d’élevage et de médecine vétérinaire des pays tropicaux 60, no. 1-4 (January 1, 2007): 133. http://dx.doi.org/10.19182/remvt.9965.

Full text

Abstract:

L’article analyse la productivité, les résultats économiques et les coûts de la production laitière de systèmes d’élevage laitier et à viande dans le département de Matagalpa, situé dans la région centre du Nicaragua. Les données sur les exploitations ont été obtenues à partir d’interviews d’un jour, destinées à l’origine à être utilisées à des fins d’évaluation interne pour un projet de développement agricole. Au total 124 observations ont été relevées sur la structure des élevages, les ventes, l’utilisation d’intrants, l’emploi de main d’oeuvre et le cheptel. Seule la zone de pâturage des bovins, qui représentait 83 p. 100 des terres, a été utilisée dans l’analyse. Les données on été divisées en quartiles afin de les organiser. Les résultats ont montré que les élevages les plus petits utilisaient la terre de manière plus intensive et avaient une productivité plus grande. Au contraire, les élevages plus grands étaient caractérisés par une productivité plus élevée de leur ressource rare, la main d’oeuvre, une indication dans les deux cas de l’efficacité de leur répartition. Le revenu familial, obtenu après déduction des dépenses en liquide et de la dépréciation des recettes totales, a été de 10 $ US par jour et par personne de la famille ayant une activité sur l’exploitation. Le coût moyen de la production de lait à court terme a été de 0,071 $/L pour l’ensemble de l’échantillon, alors que sur le long terme il a été de 0,236 $/L. Il y a eu une forte relation négative entre le coût de production et la productivité de la terre.

APA, Harvard, Vancouver, ISO, and other styles

9

Andrés López, Gonzalo. "Las ciudades medias industriales en España. Evolución histórica, proceso de urbanización y estructura urbana / The industrial medium size cities in Spain. Historical evolution, urbanization process and urban structure." Ería 1, no. 1 (May 13, 2019): 25–49. http://dx.doi.org/10.17811/er.1.2019.25-49.

Full text

Abstract:

La industria ha explicado en gran medida el desarrollo contemporáneo de las ciudades como agente económico impulsor del empleo y responsable de los grandes cambios sociales en la historia urbana. De acuerdo con esta función, las empresas y las fábricas han desarrollado una influencia decisiva en la configuración de la mayor parte de los espacios urbanos. Esta actividad ha sido también esencial en la evolución de las ciudades medias, con un proceso industrializador más tardío. Laevolución de la industria en la ciudad ha definido en gran medida la forma urbana de las actuales estructuras o, dicho de otro modo, el plano urbano de las ciudades medias españolas tiene una intensa relación con el proceso industrial contemporáneo. Esta contribución plantea una reflexión acerca de cómo se ha producido este proceso en las ciudades medias españolas, analizando la presencia de la industria en cada unade las etapas del proceso urbanizador contemporáneo.L’industrie a largement expliqué le développement contemporain des villes en tant qu’agent économique moteur de l’emploi et responsable des grands changements sociaux survenus dans l’histoire urbaine. Selon cette fonction, les entreprises et les usines ont développé une influence déterminante sur la configuration de la plupart des espaces urbains. Cette activité aégalement joué un rôle essentiel dans l’évolution des villes de taille moyenne, avec un processus d’industrialisation plus tardif. L’évolution de l’industrie de la ville a largement défini la forme urbaine des structures actuelles ou, en d’autres termes, le plan d’urbanisme des villes de taille moyenne en Espagne entretient une relation intense avec le processus industriel contemporain. Cette contribution soulève une réflexion sur la manière dont ce processus s’est déroulé dans les villes moyennes espagnoles, ainsi que sur la présence de l’industrie à chacune des étapes du processus d’urbanisation contemporain.The role of the industry has largely explained the contemporary development of cities as an economic agent for employment and being responsible for the great social changes in urban history. According to this function, companies and factories have developed a decisive influence on the configuration of most urban spaces. This activity has also been essential in the evolution of medium-sized cities, with a later industrialization process. The evolution of the industry in the city has largely defined the urban form of the current structures or, in other words, the urban plan of the Spanish medium cities has an intense relationship with the contemporary industrial process. This contribution raises a reflection about how this process has taken place in the Spanish middle cities, reflecting on the presence of industry in each of the stages of the contemporary urbanization process.

APA, Harvard, Vancouver, ISO, and other styles

10

Bergogne-Bérézin, E. "Céfuroxime axétil : relations structure-activité." Médecine et Maladies Infectieuses 21 (September 1991): 7–12. http://dx.doi.org/10.1016/s0399-077x(05)80467-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Relation structure/activité"

1

Chaurand, Frédéric. "Relation structure-activité des fluoroquinolones, place d'une nouvelle molécule : la trovafloxacine." Paris 5, 1998. http://www.theses.fr/1998PA05P203.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gehin, Eric. "Relation structure-activité au niveau du site actif de l'héparine." Paris 5, 1996. http://www.theses.fr/1996PA05P035.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Pehourcq, Fabienne. "Relations structure-activité dans la série des 2-amino-2-oxazolines." Bordeaux 2, 1991. http://www.theses.fr/1991BOR2B002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Debord, Jean. "Relation structure chimique-activité biologique pour quelques phosphoramides et benzamides." Poitiers, 1988. http://www.theses.fr/1988POIT2331.

Full text

Abstract:

Les constantes d'inhibition reversible de la butylcholinesterase par une serie de 16 phosphoramides aliphatiques ont ete determinees par spectrophotometrie et par microcalorimetrie. L'activite des substituants amines augmente avec la lipophilie. L'inhibition irreversible de la butylcholinesterase par le thio-tepa et le methyl-parathion a ete etudiee en suivant l'hydrolyse d'une faible concentration de substrat en presence de l'inhibiteur

APA, Harvard, Vancouver, ISO, and other styles

5

Nasri, Issad. "Synthèse et activité antifongique de thiols polyfonctionnels et dérivés apparentes : relation structure chimique-activité antiadhérente." Nancy 1, 1991. http://www.theses.fr/1991NAN10459.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Nahoum, Virginie. "Alpha-amylases de mammifères et d'insectes, relation structure/fonction." Aix-Marseille 3, 2000. http://www.theses.fr/2000AIX30010.

Full text

Abstract:

Les -amylases (-1,4-glucan-4-glucanohydrolase, ec 3. 2. 1. 1) catalysent l'hydrolyse des liaisons -(1,4) glycosidiques des composes de l'amidon. Dans cette these je presente l'analyse structurale de deux classes d'enzymes, les -amylases de mammiferes et d'insectes. Malgre l'abondance de donnees biochimiques sur ces complexes, les complexes entre l'-amylase humaine et des oligosaccharides avaient echappe a toute caracterisation structurale. Dans cette etude les structures cristallographiques de l'-amylase pancreatique humaine (hpa) en complexe avec des inhibiteurs naturels ont ete resolues. Le tetrasaccharide acarbose et un pseudo-pentasccharide appartenant a la famille des trestatines ont montre des densites electroniques continues similaires correspondant a un pentasaccharide, occupant les sous-sites 3 a +2 de l'enzyme, et probablement resultant d'une transglycosylation. La fixation du cur acarviosine lie a une unite glucose aux sous-sites 1 a +2 apparait etre une etape critique du processus d'interaction entre les -amylases et les inhibiteurs derives des trestatines. Deux formes cristallines du complexe entre hpa et un inhibiteur proteique (-ai) issu du grain de haricot phaseolus vulgaris, obtenues a differents ph, ont ete resolues. La boucle flexible, typique des -amylases de mammiferes, montre deux conformations differentes, suggerant une sensibilite de cette boucle au ph. Une information structurale est procuree pour le residu arg 74 qui n'etait pas visible dans les precedentes analyses structurales. L'-amylase de la larve de tenebrio molitor (tma) a ete cristallisee en complexe avec l'inhibiteur -ai. Tma presente la structure commune aux -amylases, de grandes differences avec les -amylases de mammiferes se produisant dans les boucles. Malgre ces differences dans les boucles impliquees dans l'interaction, l'inhibiteur du haricot est capable d'inhiber a la fois les -amylases de mammiferes et d'insectes. La boucle flexible des -amylases de mammiferes, tronquee dans l'-amylase d'insecte montre une conformation differente dans les structures de tma native et de tma en complexe avec -ai. La modelisation de l'attachement des isoformes de -ai dans le site actif de differentes -amylases jette un regard sur la specificite de ces inhibiteurs.

APA, Harvard, Vancouver, ISO, and other styles

7

Lidy, Sandrine. "Synthèse et étude structure-activité de molécules à activité antidiabétique et/ou antiobésité." Paris 5, 1999. http://www.theses.fr/1999PA05P633.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Roche, Annie. "L'apport des nouveaux dérivés imidazoliques dans les mycoses." Bordeaux 2, 1995. http://www.theses.fr/1995BOR2P083.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Herga, Sameh. "Relation structure-fonction de l'acylase I et de l'aspartoacylase : implication pathologique." Aix-Marseille 3, 2006. http://www.theses.fr/2006AIX30022.

Full text

Abstract:

Les acylases sont des enzymes qui hydrolysent des acylaminoacides, libérant un aminoacide libre et une fonction acyle. En fonction de la spécificité de substrat, elles sont représentées par plusieurs types. Nous nous sommes intéressés à l’acylase de type I de rein de rat (rr-ACYI), à l’acylase I humaine (ACYIh) et à l’aspartoacyalse humaine (ASPh). Pour nos études les enzymes ont été exprimées sous forme de protéines recombinantes en utilisant le système procaryote E. Coli. Nous avons montré qu’aucune cystéine n’est impliquée dans la catalyse enzymatique de l’rr-ACYI et que D82 retrouvé dans le motif H80xD82x’ permet la protonation de H80 impliquée dans la coordination d’un des atomes de zinc. Par la suite nous avons décrit pour la première fois une nouvelle maladie métabolique très certainement consécutive à l’absence d’une activité ACYIh. Par mutagenèse dirigée nous avons montré que la mutation R353C observée chez le patient était responsable de la perte d’activité qui pourrait être en relation directe avec le faible taux d’ ARNm détecté. Enfin, l’étude menée sur l’ASPh, responsable de la maladie de Canavan, montre que cette protéine est une métalloenzyme à zinc catalytique et non pas une enzyme à sérine. Les acides aminés H21, E24 et H116 ont été caractérisés comme étant impliqués dans la coordination du métal et se trouvant au voisinage de E178 qui est le résidu catalytique
Acylases are enzymes which hydrolyze acylamino acids releasing a free amino acid and an acidic group. Different types have been described according to the substrate. We studied kidney rat acylase I (rr-ACYI), human acylase I (ACYIh) and human aspartoacylase (ASPh). The proteins were expressed as recombinant proteins using the E. Coli prokaryotic system. We showed that any cysteine residue was implicated during the catalysis phenomenon and that D82 belonging to the H80xD82x’ motif is to ensure a proper protonation of H80 residue implicated in zinc coordination. For the first we described a novel inborn error of metabolism with ACYIh deficiency. By site-directed mutagenesis, we have demonstrated that R353C mutation observed in the patient was responsible for enzyme deficiency, in correlation with mRNA level. Finally, we confirmed that ASPh, an enzyme involved in the Canavan disease, is a zinc metalloenzyme. H21, E24 and H116 were characterized as amino acids implicated in the metal coordination and that are in the vicinity of the catalytic E178

APA, Harvard, Vancouver, ISO, and other styles

10

Vachoud, Laurent. "Étude de la relation structure-propriétés des gels de chitine." Lyon 1, 1999. http://www.theses.fr/1999LYO10137.

Full text

Abstract:

Cette these concerne l'etude de la formation des proprietes physico-chimiques et mecaniques du gel de chitine obtenu par acetylation du chitosane a l'aide de l'anhydride acetique en milieu hydroalcoolique (propanediol-1,2/eau). Plusieurs parametres sont susceptibles d'influencer la gelification : la stchiometrie anhydride/amine utilisee pour realiser le gel, la masse molaire du chitosane, sa concentration, la temperature ainsi que la nature de l'alcool. La mobilite moleculaire et la structure chimique du polymere sont les facteurs preponderants du mecanisme de formation du gel puisque ces deux parametres ont une influence considerable sur la balance entre les interactions attractives et les interactions repulsives entre les chaines de polymere. Les proprietes physico-chimiques du gel, etudiees en fonction des parametres cites ci-dessus, sont les suivantes : la synerese qui correspond a une liberation spontanee et partielle du solvant du gel, le gonflement du reseau dans differents solvants ainsi que sa solubilite en relation avec sa structure chimique. Des interactions irreversibles (ponts hydrogene et interactions hydrophobes) limitant le gonflement du gel sont susceptibles d'etre creees entre les chaines constituant le reseau. L'evolution de la masse du gel au cours de la depletion peut etre modelisee par la loi suivante mt = (m 0k 1 + m. T)/(k 1 + t) ou m 0 est la masse du gel avant synerese, m, est la masse du gel pour des temps infinis et k 1 une constante de temps. Il est possible apres derivation de calculer la vitesse d'expulsion du solvant. La porosite du gel est suffisamment elevee pour que des molecules isolees et de faibles masses molaires telles que les vitamines pp et b1 ou la cafeine diffusent facilement a travers le reseau. Enfin, la structure chimique du reseau est telle que le gel est susceptible de produire soit des interactions electrostatiques soit des interactions de plus faible energie avec differents substrats.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Relation structure/activité"

1

1941-, Lamy Jean, Truchot J. P. 1937-, Gilles R, International Union of Biological Sciences. Section of Comparative Physiology and Biochemistry., and International Congress of Comparative Physiology and Biochemistry (1st : 1984 : Liège, Belgium), eds. Respiratory pigments in animals: Relation, structure-function. Berlin: Springer-Verlag, 1985.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Hans-Joachim, Böhm, and Gubernator Klaus, eds. Structure-based ligand design. Weinheim: Wiley-VCH, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

de, Waterbeemd Han van, ed. Chemometric methods in molecular design. Weinheim: VCH, 1995.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

E, Robertson Dan, and Noel Joseph P, eds. Protein engineering. Amsterdam: Elsevier Academic Press, 2004.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

5

William, Hutchens T., J.T. Baker Chemical Co., and University of California, Los Angeles., eds. Protein recognition of immobilized ligands: Proceedings of a J.T. Baker-UCLA Colloquium, held at Santa Fe, New Mexico, December 2-7, 1987. New York: A.R. Liss, 1989.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

Conversation in Biomolecular Stereodynamics (5th 1987 State University of New York at Albany). Structure & expression: Proceedings of the Fifth Conversation in the Discipline Biomolecular Stereodynamics held at the State University of New York at Albany, June 2-6, 1987. Schenectady, NY: Adenine Press, 1988.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

1937-, Hall Lowell H., ed. Molecular connectivity in structure-activity analysis. Letchworth, Hertfordshire, England: Research Studies Press, 1986.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

Symposium, on the Applications and Modifications of Industrial Polysaccharides (1987 Denver Colo ). Industrial polysaccharides: Genetic engineering, structure-property relations and applications. Amsterdam: Elsevier, 1987.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

1960-, Ladbury John E., and Connelly Pat R. 1961-, eds. Structure-based drug design: Thermodynamics, modeling, and strategy. Austin: Landes Bioscience, 1997.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Romualdo, Benigni, ed. Quantitative structure-activity relationship (QSAR) models of mutagens and carcinogens. Boca Raton, Fla: CRC Press, 2003.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Relation structure/activité"

1

Lancini, Giancarlo, Francesco Parenti, and Gian Gualberto Gallo. "Activity of Antibiotics in Relation to Their Structure." In Antibiotics, 107–78. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-9200-3_5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Chen, N. Y., William E. Garwood, and Francis G. Dwyer. "Relation Between Zeolite Structure and Its Catalytic Activity." In Shape Selective Catalysis in Industrial Applications, Second Edition,, 5–36. 2nd ed. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003418207-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Gürel, Tayfun, Luc De Raedt, and Stefan Rotter. "Mining Structure-Activity Relations in Biological Neural Networks using NeuronRank." In Perspectives of Neural-Symbolic Integration, 49–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73954-8_3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Bley, K., and I. Ugi. "Computer — Assisted Analysis of Qualitative Structure/Activity Relations of Organic Molecules." In Software Development in Chemistry 4, 67–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75430-2_8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Lantela, Lauri, Ville Pietiläinen, and Saana Korva. "Examining Contradictions for the Development of Competencies in School Leadership." In Leadership in Educational Contexts in Finland, 257–79. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-37604-7_13.

Full text

Abstract:

AbstractThis study examined the challenges school principals face at work, and their support needs for professional development. The study drew on cultural-historical activity theory (CHAT) and approached as contradictions principals’ work, the schools in which they operate as activity systems and the challenges they face. The research data consists of three data sets collected from principals: data from a quantitative survey (n = 47), data from workshops for principals (n = 8) and data from individual interviews (n = 5). Three main contradictions were formed from the data and named as (1) inadequate tools in relation to the object of activity, (2) hierarchical structure and tradition of schools and (3) fragmentation of the subject. The results reveal that the work of the principal and the organizational environment are increasingly complex—principals must solve unique problems that are new both to them and in society. The results point towards a shift in problem-solving and learning from an individual perspective towards the communal and inter-organizational view. A CHAT framework can be used as a tool in the development of these collaborative structures, practices and culture.

APA, Harvard, Vancouver, ISO, and other styles

6

López, Tatiana. "A Relational Analysis of the Labour Control Regime in the Bangalore Export-garment Cluster." In Economic Geography, 149–207. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27387-2_6.

Full text

Abstract:

AbstractThis chapter applies a practice-oriented, relational analytical approach to labour control regimes in GPNs to the empirical case of the Bangalore export-garment cluster. It illustrates how the labour control regime in the Bangalore export-garment cluster emerges from the intersection of six different sets of processual relations with the labour process: sourcing relations, wage relations, workplace relations, industrial relations, employment relations and labour market relations. For each set of relations, the chapter reveals the specific exploiting and disciplining practices performed by actors at various levels, which together constitute structural labour control relations. These practices include inter alia Bangalore garment managers’ production targeting, union-busting and wage theft practices, garment retailers’ predatory purchasing practices, and employers’ and state actors’ practices of constructing a complex multi-level training and migration regime to secure adequate labour supply. In the face of this complex mesh of labour control practices, the chapter highlights the various constraints and challenges for local garment unions to build and activate associational and institutional power resources.

APA, Harvard, Vancouver, ISO, and other styles

7

Glückler, Johannes, and Jakob Hoffmann. "Time Banks as Transient Civic Organizations? Exploring the Dynamics of Decline." In Knowledge and Civil Society, 131–46. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71147-4_7.

Full text

Abstract:

AbstractTime banks have become a popular type of civic organization constructed to facilitate egalitarian economic exchange through a community-bounded currency. Especially after the recent economic crises in Europe, the rise in the number of time banks has been accompanied by relative transience and sometimes short lifespans. We adopt a relational perspective to explore the dynamics of decline in the civic engagement of a time bank in southern Germany. Using methods of longitudinal social network analysis, we analyze the relational processes and individual trajectories of members within the emerging transaction network over a period of eight years. Rather than explaining why, we have found how relational trajectories of members through a structure of core and periphery have led to creeping decline in activity and membership. Given the repeated observation that time banks and other types of alternative economic practices are often characterized by considerable volatility and potential collapse, relational thinking and network analysis are especially suited to unpacking the underlying relational mechanisms that shape these outcomes of volatility and demise.

APA, Harvard, Vancouver, ISO, and other styles

8

Rietschel, Ernst Th, Lore Brade, Ulrich Schade, Ulrich Seydel, Ulrich Zähringer, Otto Holst, Hella-Monika Kuhn, Vladimir A. Kulschin, Anthony P. Moran, and Helmut Brade. "Bacterial Endotoxins: Relationships between Chemical Structure and Biological Activity of the Inner Core-Lipid a Domain." In Microbial Surface Components and Toxins in Relation to Pathogenesis, 209–17. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8995-8_23.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Aurrekoetxea-Casaus, Maite, Edurne Bartolomé Peral, Günter Hefler, Ivana Studená, and Janine Wulz. "Speaking Up: How Early Career Workers Engage in Fighting for Better Working Conditions by Joining Youth-Led Social Movement Organisations." In Lifelong Learning, Young Adults and the Challenges of Disadvantage in Europe, 351–76. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-14109-6_14.

Full text

Abstract:

AbstractLearning from activism, usually informal and unrecognised, is an important component of industrial relations and a major learning source for individuals, organisations and society. Young workers who lack support from existing employee organisations may create their own. Based on studies of social movement organisations in highly diverse industrial relations systems (Austria, Spain’s Basque Region, Slovakia), this chapter presents a framework for analysing and comparing novel social movement organisations’ position within industrial relations systems. Each was founded because its national system did not adequately address challenges. Activism enables young people employed in workplaces unfavourable to learning, or unemployed, to compensate for what better workplaces offer. Youth-led social movement organisations generate important knowledge and practical skills, challenging established organisations, including trade unions, and renewing industrial relations structures.

APA, Harvard, Vancouver, ISO, and other styles

10

Sato, Toshinori, Mariko Mizuno, Hiroyoshi Takata, Tomoaki Yamada, Takehi Isse, Kimihiro Mochizuki, Masanao Shinohara, and Nobukazu Seama. "Seismic Structure and Seismicity in the Southern Mariana Trough and Their Relation to Hydrothermal Activity." In Subseafloor Biosphere Linked to Hydrothermal Systems, 229–40. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54865-2_18.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Relation structure/activité"

1

Shevtsov, B. M., M. S. Permyakov, E. Yu Potalova, N. V. Cherneva, and Robert Holzworth. "Relation of tropical cyclone structure with thundersorm activity." In XXI International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, edited by Oleg A. Romanovskii. SPIE, 2015. http://dx.doi.org/10.1117/12.2203348.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Torres-Gomez, Luis Alberto, Luis Alberto Torres, Laura Machin, and Enoel Hernández Barreto. "Relation ``structure-anticoagulant activity´´ using topologic indices ." In MOL2NET 2016, International Conference on Multidisciplinary Sciences, 2nd edition. Basel, Switzerland: MDPI, 2016. http://dx.doi.org/10.3390/mol2net-02-01003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Fringeli, Urs P., Peter Ahlstrom, Claudius Vincenz, and Marianna Fringeli. "Structure-Activity Relations In Enzymes: An Application Of IR-ATR Modulation Spectroscopy." In 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, edited by David G. Cameron and Jeannette G. Grasselli. SPIE, 1985. http://dx.doi.org/10.1117/12.970787.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Xu, Jing Y., Chen Wen, Li M. Jia, and Chang F. Xiao. "Ag/WO 3 -codoped TiO 2 nanoparticles: relation between structure, sorption, and photocatalytic activity." In Second International Conference on Smart Materials and Nanotechnology in Engineering, edited by Jinsong Leng, Anand K. Asundi, and Wolfgang Ecke. SPIE, 2009. http://dx.doi.org/10.1117/12.838335.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Deng, Zhiwei, Arash Vahdat, Hexiang Hu, and Greg Mori. "Structure Inference Machines: Recurrent Neural Networks for Analyzing Relations in Group Activity Recognition." In 2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2016. http://dx.doi.org/10.1109/cvpr.2016.516.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Galkina, Elena. "Implementation of the Assets and Liabilities Structure’s Ratios in a Company Activity Evaluation." In VIII International Scientific and Practical Conference 'Current problems of social and labour relations' (ISPC-CPSLR 2020). Paris, France: Atlantis Press, 2021. http://dx.doi.org/10.2991/assehr.k.210322.116.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Mazur, Anna. "The structure of the relationship between physical activity and psychosocial functioning of women and men during the COVID-19 epidemic in Poland." In 2nd International Neuropsychological Summer School named after A. R. Luria “The World After the Pandemic: Challenges and Prospects for Neuroscience”. Ural University Press, 2020. http://dx.doi.org/10.15826/b978-5-7996-3073-7.11.

Full text

Abstract:

Since the COVID.19 pandemic is a serious crisis in many countries around the world, it is important to conduct empirical research aimed at identifying risks and factors protecting the functioning of people affected by it [1, 2]. For this reason, the goal of this research is to determine the structure of the relationship between physical activity and psychosocial functioning of 226 women and 226 men during the COVID.19 epidemic in Poland by looking at connections between physical activity, mental health disorders and cognitive processes and their significance for the quality of social relations. Methodologically, the research relies on IPAQ Questionnaire [3], GHQ-28 Questionnaires [4], TUS Test — 6/9 version [5] and the original SFS Scale. The structural model indicates that physical activity weakens the relationship between mental health disorders and cognitive processes, and gender is the moderator of these relationships. This suggests that physical activity adapted to the condition of health may be an important component of gender. individualized psycho. preventive interventions.

APA, Harvard, Vancouver, ISO, and other styles

8

Minggang, Tang, Wang Ziyuan, Xu Chun, Li Shengpeng, Chen Yuchao, and Ni Xinyun. "Strength Prediction of Connector Structure of the Double-Module Semi-Submersible Platform." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62729.

Full text

Abstract:

Abstract A double-module semi-submersible platform for scientific experiment has been applied firstly in practical engineering. Hinge-type connectors are used to link the two modules reliably and release the relative pitch freedom, and the strength of connector structures determines directly the integrity and safety of the platform. In this paper, the three-dimensional finite element model of the platform structure is developed including the local features of connectors, and main elastic modes are obtained. By using the Potential flow theory and the Green Function method, the hydrodynamic coefficients of the model are determined. Based on the three-dimensional hydroelastic theory, the response amplitude operators (RAOs) of generalized coordinates associated with different order modes are investigated. That indicates the structural deformation of connectors is excited mainly by modes of horizontal bending moment and torsion, and the stress responses in the longitudinal bulkheads close to bearings are generally marked. Using the modal superposition method, the RAOs of stress in the typical joints of connector structures are calculated under the given wave directions. Considering the JONSWAP spectrum and the amplitudes of stress responses of connector structures following Rayleigh distribution in short term, the strength of the connector structure is predicted in short term. In order to verify the correctness of the strength prediction method presented in this paper, more than thirty stress sensors are installed on the typical joints of connector structures of the double-module semi-submersible platform located in the real sea. Those stress responses are monitored during the typical typhoon activity, and the statistical data is compared with the predicted results from the theoretical model. Both the distribution trend and magnitudes of the results from the two methods are principally consistent that validates the given model. This theoretical method may provide an effective tool to analyze the strength of connector structures of multiple-module offshore platform.

APA, Harvard, Vancouver, ISO, and other styles

9

De Cosmo, Giove, James A. Scobie, Gary D. Lock, Carl M. Sangan, and Mauro Carnevale. "Fluid-Dynamics of Turbine Rim Seal Structures: A Physical Interpretation Using URANS." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82591.

Full text

Abstract:

Abstract Unsteady Reynolds-Averaged Navier-Stokes modelling (URANS) is a valuable and cost-effective tool for Computational Fluid Dynamics (CFD), including the investigation of mainstream-cavity interaction in turbines. Despite the gap in accuracy with higher order CFD methodologies, URANS is among the few simulation strategies of industrial interest suitable for predicting ingress/egress over a wide range of conditions. This paper presents a numerical study of the flow-field in the upstream double-radial seal of a 1.5 stage turbine. Various configurations are tested, including non-purged and purged conditions. Rigour of the approach is ensured by a set of sensitivity analyses, allowing the delineation of a best practice on the use of URANS in rim seal simulations: this includes an assessment of the effects of sector size, cavity domain size and blade count. Time-averaged and time-resolved flow predictions capture coherent structures in the rim gap. An association between the 3D morphology of these structures and different ingress/egress mechanisms is proposed. Regions of enhanced radial activity are identified to correspond with the blade leading edges. A frequency analysis of unsteady pressure signals probed in the rim gap leads to a calculation of the structure number and speed. The structures are synchronous with the disc rotation for non-purged cases but rotate at slower speed when purge is introduced. The relative number of blades and vanes directly influences the structure count and velocity. The configuration with no blades is characterised by the slowest structures. The calculations have been conducted at three different flow coefficient for the annulus flow. There is a reduction in radial activity and structure speed at lower flow coefficient, fundamentally related to the reduced pressure asymmetry and gradient of swirl across the rim seal.

APA, Harvard, Vancouver, ISO, and other styles

10

Ubaldi, Marina, Pietro Zunino, and Andrea Cattanei. "Relative Flow and Turbulence Measurements Downstream of a Backward Centrifugal Impeller." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-212.

Full text

Abstract:

The paper presents the results of an experimental investigation on the three-dimensional relative flow at the exit of the backward bladed centrifugal impeller of the high pressure stage of a two stage biregulating pump-turbine model, operating at the pump nominal point. Mean velocity, Reynolds stress tensor and total pressure of the relative flow have been measured with stationary hot wire probes and fast response miniature pressure transducers, by means of a phase locked ensemble average technique. The results, shown in terms of secondary vector plots and contours of mean flow characteristics and Reynolds stress components, give a detailed picture of the flow kinematic structure and of the complex relative total pressure loss and turbulence distributions. In spite of strongly backswept blades, the flow leaving the impeller presents a jet and wake structure and an intense secondary flow activity. Large relative total pressure losses affect the wake and the region where secondary vortices interact. The turbulence data analysis provides information about the effects of the impeller rotation on the turbulence structure and about the mechanisms of the flow mixing process and of the secondary flow decay downstream of the impeller.

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Relation structure/activité"

1

Wilson, Leland Y., and George R. Famini. Using Theoretical Descriptions in Structure Activity Relations. 3. Electronic Descriptors. Fort Belvoir, VA: Defense Technical Information Center, August 1988. http://dx.doi.org/10.21236/ada200482.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Chen, Yona, Jeffrey Buyer, and Yitzhak Hadar. Microbial Activity in the Rhizosphere in Relation to the Iron Nutrition of Plants. United States Department of Agriculture, October 1993. http://dx.doi.org/10.32747/1993.7613020.bard.

Full text

Abstract:

Iron is the fourth most abundant element in the soil, but since it forms insoluble hydroxides at neutral and basic pH, it often falls short of meeting the basic requirements of plants and microorganisms. Most aerobic and facultative aerobic microorganisms possess a high-affinity Fe transport system in which siderophores are excreted and the consequent Fe complex is taken up via a cognate specific receptor and a transport pathway. The role of the siderophore in Fe uptake by plants and microorganisms was the focus of this study. In this research Rhizopus arrhizus was found to produce a novel siderophore named Rhizoferrin when grown under Fe deficiency. This compound was purified and its chemical structure was elucidated. Fe-Rhizoferrin was found to alleviate Fe deficiency when applied to several plants grown in nutrient solutions. It was concluded that Fe-Rhizoferrin is the most efficient Fe source for plants when compared with other among microbial siderophores known to date and its activity equals that of the most efficient synthetic commercial iron fertilizer-Fe EDDHA. Siderophores produced by several rhizosphere organisms including Rhizopus Pseudomonas were purified. Monoclonal antibodies were produced and used to develop a method for detection of the siderophores produced by plant-growth-promoting microorganisms in barley rhizosphere. The presence of an Fe-ferrichrome uptake in fluorescent Pseudomonas spp. was demonstrated, and its structural requirements were mapped in P. putida with the help of biomimetic ferrichrome analogs. Using competition experiments, it was shown that FOB, Cop B and FC share at least one common determinant in their uptake pathway. Since FC analogs did not affect FOB or Cop-mediated 55Fe uptake, it could be concluded that these siderophores make use of a different receptor(s) than FC. Therefore, recognition of Cop, FOB and FC proceeds through different receptors having different structural requirements. On the other hand, the phytosiderophores mugineic acid (MA and DMA), were utilized indirectly via ligand exchange by P. putida. Receptors from different biological systems seem to differ in their structural requirements for siderophore recognition and uptake. The design of genus- or species-specific drugs, probes or chemicals, along with an understanding of plant-microbe and microbe-microbe relationships as well as developing methods to detect siderophores using monoclonal antibodies are useful for manipulating the composition of the rhizosphere microbial population for better plant growth, Fe-nutrition and protection from diseases.

APA, Harvard, Vancouver, ISO, and other styles

3

Kopelman, R. (Nanometer scale exciton spectroscopy and photochemistry: Dynamic imaging of DNA structure-activity relations and radiation signatures). Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6060311.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Mullery, Colleen. A Structural Analysis of Corporate Political Activity: An Application of Euclidean Modeling to the Study of Intercorporate Relations. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.1302.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kopelman, R. [Nanometer scale exciton spectroscopy and photochemistry: Dynamic imaging of DNA structure-activity relations and radiation signatures]. Progress report, September 24, 1990--July 24, 1991. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10107053.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Kopelman, R. Nanometer scale exciton/photon dynamic spectrochemical imaging for DNA structure-activity relations and radiation signatures. Final progress report, December 24, 1993--December 23, 1996. Office of Scientific and Technical Information (OSTI), June 1997. http://dx.doi.org/10.2172/486116.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Hill, Braden. Unseen inequities: The role of leadership in addressing structural barriers to education in Australian universities. Journal of the Australian and New Zealand Student Services Association, April 2023. http://dx.doi.org/10.30688/janzssa.2023-1-05.

Full text

Abstract:

The lack of diversity in leadership positions within the Australian university sector has been a persistent issue, with predominantly older, white, male leaders holding power and shaping the future of higher education. While student demographics have become more diverse, the leadership of academic institutions has not kept pace with these changes. Therefore, as student expectations and attitudes change, university communities are encouraged to (re)consider their commitment to proactively addressing the structural inequalities that continue to impact the journeys of the students we seek to serve. Nevertheless, activist universities—those that proactively and visibly seek to lead on matters of socio-political importance—are few and far between. The referendum to change the constitution to recognise Aboriginal and Torres Strait Islander people through the establishment of a Voice to Parliament is an example where change has the potential to tangibly address educational inequality. The positions that institutions choose to take (or not), in relation to the attitudes held by a considerable proportion of our student cohorts, presents a strong argument for courageous leadership at all levels of our universities to lead, educate, and advocate for social good.

APA, Harvard, Vancouver, ISO, and other styles

8

Shomer, Ilan, Louise Wicker, Uzi Merin, and William L. Kerr. Interactions of Cloud Proteins, Pectins and Pectinesterases in Flocculation of Citrus Cloud. United States Department of Agriculture, February 2002. http://dx.doi.org/10.32747/2002.7580669.bard.

Full text

Abstract:

The overall objective was to understand the cloud flocculation of citrus juice by characterization of the interactions between proteins and pectins, and to determine the role of PE isozymes in catalyzing this phenomenon. Specific objectives were to: 1. identify/characterize cloud-proteins in relation to their coagulable properties and affinity to pectins; 2. to determine structural changes of PME and other proteins induced by cation/pectin interactions; 3. localize cloud proteins, PME and bound protein/pectates in unheated and pasteurized juices; 4. to create "sensitized" pectins and determine their effect on clarification. The original objectives were not changed but the methods and approach were modified due to specific research requirements. Two i postulates were: 1. there is a specific interaction of cloud proteins with de-esterified regions of ! pectin and this contributes to cloud loss; 2. isozymes of pectin-methyl-esterase (PME) vary in efficiency to create sensitized pectins. The appearance of citrus fruit juice is an important quality factor and is determined by the color and turbidity that .are conferred by the suspended particles, i.e., by the cloud and its homogeneity. Under some circumstances the cloud tend to flocculate and the juice clarifies. The accepted approach to explain the clarification is based on pectin demethoxylation by PME that promotes formation of Ca-pectate. Therefore, the juice includes immediate heat-inactivation upon ~ squeezing. Protein coagulation also promotes cloud instability of citrus fruit extracts. However, the clarification mechanism is not fully understood. Information accumulated from several laboratories indicates that clarification is a more complex process than can be explained by a single mechanism. The increasing trend to consume natural-fresh juice emphasizing the importance of the knowledge to assure homogeneity of fresh juice. The research included complementary directions: Conditions that induce cloud-instability of natural- juice [IL]. Evaluate purification schemes of protein [USA]. Identifications of proteins, pectin and neutral sugars ([IL]; Structure of the cloud components using light and electron microscopy and immuno-labeling of PME, high-methoxyl-pectin (HMP) and low-methoxyl-pectin (LMP); Molecular weight of calcium sensitized pectins [US]; Evaluation of the products of PME activity [US]. Fractions and size distribution and cloud components [IL-US]. The optimal pH activity of PME is 7 and the flocculation pH of the cloud is 3-4. Thus, the c roles of PME, proteins and pectins in the cloud instability, were studied in pH ranges of 2- 7. The experiments led to establish firstly repeatable simulate conditions for cloud instability [IL]. Thermostable PME (TS-PE) known to induce cloud instability, but also thermolabile forms of PME (TL-PE) caused clarification, most likely due to the formation and dissolution of inactive :. PE-pectin complexes and displacement of a protective colloid from the cloud surface [US]. Furthermore, elimination of non-PME protein increases TS-PE activity, indicating that non-PME proteins moderate PME activity [US]. Other experiments Concomitantly with the study of the PME activity but promotes the association of cloud-proteins to pectin. Adjusting of the juice pH to f 7 retains the cloud stability and re-adjusting of the pH to 40% DE reacts to immuno-labeling in the cloud fragments, whereas

APA, Harvard, Vancouver, ISO, and other styles

9

Hoitink, Harry A. J., Yitzhak Hadar, Laurence V. Madden, and Yona Chen. Sustained Suppression of Pythium Diseases: Interactions between Compost Maturity and Nutritional Requirements of Biocontrol Agents. United States Department of Agriculture, June 1993. http://dx.doi.org/10.32747/1993.7568755.bard.

Full text

Abstract:

Several procedures were developed that predict maturity (stability) of composts prepared from municipal solid wastes (MSW). A respirometry procedure, based O2 uptake by compost, predicted (R2=0.90) the growth response of ryegrass in composts and an acceptable level of maturity. Spectroscopic methods (CPMAS13-NMR and DRIFT spectroscopy) showed that the stabilizing compost contained increasing levels of aromatic structures. All procedures predicted acceptable plant growth after approximately 110 days of composting. MSW compost suppressed diseases caused by a broad spectrum of plant pathogens including Rhizoctonia solani, Pythium aphanidermatum and Fusarium oxysporum. A strain of Pantoea agglomerans was identified that caused lysis of hyphae of R. solani. Evidence was obtained, suggesting that thermophilic biocontrol agents also might play a role in suppression. 13C-NMR spectra revealed that the longevity of the suppressive effect against Pythium root rot was determined by the concentration of readily biodegradable carbohydrate in the substrate, mostly present as cellulose. Bacterial species capable of inducing biocontrol were replaced by those not effective as suppression was lost. The rate of uptake of 14C-acetate into microbial biomass in the conducive substrate was not significantly different from that in the suppressive substrate although specific activity was higher. The suppressive composts induced systemic acquired resistance in cucumjber roots to Pythium root rot and to anthracnose in the foliage. Composts also increased peroxidase activity in plants by the conducive substrate did not have these effects. In summary, the composition of the organic fraction determined bacterial species composition and activity in the substrate, which in turn regulated plant gene expression relative to biological control.

APA, Harvard, Vancouver, ISO, and other styles

10

Hoitink, Harry A. J., Yitzhak Hadar, Laurence V. Madden, and Yona Chen. Sustained Suppression of Pythium Diseases: Interactions between Compost Maturity and Nutritional Requirements of Biocontrol Agents. United States Department of Agriculture, June 1993. http://dx.doi.org/10.32747/1993.7568746.bard.

Full text

Abstract:

Several procedures were developed that predict maturity (stability) of composts prepared from municipal solid wastes (MSW). A respirometry procedure, based O2 uptake by compost, predicted (R2=0.90) the growth response of ryegrass in composts and an acceptable level of maturity. Spectroscopic methods (CPMAS13-NMR and DRIFT spectroscopy) showed that the stabilizing compost contained increasing levels of aromatic structures. All procedures predicted acceptable plant growth after approximately 110 days of composting. MSW compost suppressed diseases caused by a broad spectrum of plant pathogens including Rhizoctonia solani, Pythium aphanidermatum and Fusarium oxysporum. A strain of Pantoea agglomerans was identified that caused lysis of hyphae of R. solani. Evidence was obtained, suggesting that thermophilic biocontrol agents also might play a role in suppression. 13C-NMR spectra revealed that the longevity of the suppressive effect against Pythium root rot was determined by the concentration of readily biodegradable carbohydrate in the substrate, mostly present as cellulose. Bacterial species capable of inducing biocontrol were replaced by those not effective as suppression was lost. The rate of uptake of 14C-acetate into microbial biomass in the conducive substrate was not significantly different from that in the suppressive substrate although specific activity was higher. The suppressive composts induced systemic acquired resistance in cucumjber roots to Pythium root rot and to anthracnose in the foliage. Composts also increased peroxidase activity in plants by the conducive substrate did not have these effects. In summary, the composition of the organic fraction determined bacterial species composition and activity in the substrate, which in turn regulated plant gene expression relative to biological control.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!