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Dissertations / Theses on the topic 'Herbicides action'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Perim, Lucas [UNESP]. "Efeitos de óleos nas características físicas e químicas da calda de aplicação e na ação da atrazina." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/86377.

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Made available in DSpace on 2014-06-11T19:22:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-29Bitstream added on 2014-06-13T20:09:10Z : No. of bitstreams: 1 perim_l_me_botfca.pdf: 642600 bytes, checksum: 3f26247a69a07b1413c3746c23e76085 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>O uso de adjuvantes é adotado em todo o mundo, a fim de melhorar a eficácia das formulações de defensivos agrícolas, independente do tipo de alvo. Existem duas maneiras principais em que adjuvantes podem melhorar o desempenho final do produto. Em primeiro lugar, aum

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2

Li, Hwei-Yiing. "Mechanisms of action and selectivity of the cyclohexen-one herbicide cycloxydim (BAS 517)." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39985.

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The activity and the selectivity of cycloxydim {2-[1-(ethoxyimino)butylJ-3-hydroxy- 5-(2H-tetrahydrothiopyran-3-yl)-2-cyclohexen-l-one}, code designation BAS 517, were examined flIst with etiolated seedlings of com (Zea mays L.) and soybean [Glycine max (L.) Merr.]. Etiolated soybean seedlings were not affected by cycloxydim. The degree of growth inhibition of com varied with concentration of cycloxydim and incubation time. Compared to mesocotyls and coleoptiles, radicles of corn were the most sensitive to cycloxydim. Meristematic tissues appeared to be the site of action of cycloxydim as root

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3

Patel, R. "Studies into the mode of action of some herbicides." Thesis, University of East Anglia, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374287.

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4

Perim, Lucas 1980. "Efeitos de óleos nas características físicas e químicas da calda de aplicação e na ação da atrazina /." Botucatu : [s.n.], 2011. http://hdl.handle.net/11449/86377.

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Resumo: O uso de adjuvantes é adotado em todo o mundo, a fim de melhorar a eficácia das formulações de defensivos agrícolas, independente do tipo de alvo. Existem duas maneiras principais em que adjuvantes podem melhorar o desempenho final do produto. Em primeiro lugar, aumentando a quantidade de ingrediente ativo retido pelo alvo e, por outro, melhorando a sua absorção. O objetivo do presente trabalho foi avaliar os efeitos de óleos minerais e vegetais nas características físicas e químicas da calda de aplicação e na ação do herbicida atrazina (Gesaprim 500® SC). Os tratamentos estudados fora

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5

Hallahan, Beverly Jill. "The mode of action of nitrodiphenyl ether and related herbicides." Thesis, Royal Holloway, University of London, 1989. http://repository.royalholloway.ac.uk/items/80eb70b7-b7e5-4085-be04-255ee96cd689/1/.

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Nitrodiphenyl ether (NDPE) and related herbicides cause light and oxygen-dependent lipid peroxidation in susceptible green plants and algae. The exact mode of action of these herbicides has not yet been clearly established. Experiments with the alga Scenedesmus obliquus indicate that the role of photosynthetic electron transport is principally to generate the oxygen required for NDPE toxicity, rather than having a more direct involvement. DPE I an experimental NDPE, did not induce lipid peroxidation or chlorophyll bleaching in the alga Chlamydomonas reinhardtii but the herbicide did inhibit gr

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6

Ipor, Isa Bin. "Action of herbicides on Mikania micrantha H.B.K. and Paspalum conjugatum Berg." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47485.

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7

Tomlinson, Ian David. "Studies of the mode of action of 2-phenoxy-N-phenyl nicotinamides as herbicides." Thesis, University of Essex, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328368.

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8

Thompson, L. M. L. "An investigation into the mode of action and selectivity of 3,6-dichloropicolinic acid." Thesis, Nottingham Trent University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234758.

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9

SATTI, MOHAMED AHMED EISA. "THE MECHANISM OF ACTION OF FLUAZIFOP-BUTYL, HALOXYFOP-METHYL, AND SETHOXYDIM HERBICIDES ON WHEAT (TRITICUM AESTIVUM L.) SEEDLINGS (CHLOROPLAST DEVELOPMENT)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188097.

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Haloxyfop-methyl 2-[4-[ [3-chloro-5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoate, fluazifop-butyl (±)-2-[4-[ [5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoate, and sethoxydim 2- [1-(ethoxyimino)butyl]-5- [2-(ethylthio)propyl] -3-hydroxy-2-cyclohexen-1-one modified chloroplast pigment, growth, anatomy, and ultrastructure of pre- and postemergent-treated wheat (Triticum aestivum 'Pavon 76') seedlings. Seedlings were grown under 16 h photoperiod (105 μE/M²/S) at 32/24 C day/night temperature. Pigment, growth and anatomical studies were made on pre- and postemergent-treated see

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10

Zama, Paul. "Studies on the mechanisms of action of the herbicide safener CGA- 92194." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49970.

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CGAr92194 {α-[1,3-dioxolan-2-yl-methoxy)imino]benzeneacetonitrile} is a herbicide safener that is used as a seed dressing agent (1.25 g ai/kg seeds) to protect grain sorghum [<i>Sorghum bicolor</i> (L.) Moench] against metolachlor [2-chloroi-<u>N</u>-(2-ethyl-6-methylphenyl-<u>N</u>-(2-methoxy1-methylethyl)acetamide] injury. The potential adverse phytotoxic effects and the mechanisms of the protective action of this safener were studied in laboratory experiments. Adverse phytotoxicity was assessed by comparing CGA-92194 and the herbicide safeners cyometrinil {(Z)-α[(cyanomethoxy)imino]benzene

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11

Songa, Everlyne Apiyo. "Composite Poly(dimethoxyaniline) Electrochemical Nanobiosensor For Glufosinate And Glyphosate Herbicides." Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5055_1273696186.

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<p>In this thesis, I present a simple, sensitive and low cost electrochemical nanobiosensor for quantitative determination of the herbicides glufosinate, glyphosate and its metabolite aminomethylphosphonic acid (AMPA). Firstly, the nanostructured poly(2,5-dimethoxyaniline) (PDMA) materials were synthesized on gold electrode by the electrochemical &ldquo<br>soft template&rdquo<br>method using poly(4-styrenesulfonic acid) (PSS) as the dopant and structure-directing molecule. Fourier transform infrared (FTIR) spectroscopy, UV-Vis Spectroscopy, Transmission electron microscopy (TEM) and Scanning e

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12

Meschede, Dana Kátia. "Efeito do glyphosate e sulfumeturon-metil na fisiologia da cana-de-açúcar /." Botucatu : [s.n.], 2009. http://hdl.handle.net/11449/99922.

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Resumo: As rotas em que atuam os herbicidas devem ser fundamentais para o crescimento e desenvolvimento vegetal, pois o seu bloqueio deve promover a paralisação do crescimento ou a morte das plantas. De modo análogo, o bloqueio parcial destas rotas, com uso de baixas doses dos herbicidas, também pode ter implicações importantes alterando o balanço de processos metabólicos nas plantas. Sendo assim, foi conduzido no ano agrícola 2006/2007, um experimento em cana soca 2º corte na Fazenda Jurema pertencente ao grupo Cosan, município de Barra Bonita-SP, para verificar os efeitos do glyphosate e do

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13

Yenne, Samuel P. "Investigations on the mechanism of action of the oxime ether safeners for the protection of grain sorghum against metolachlor." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54821.

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Herbicide safeners (protectants, antidotes) are used to protect crop plants from herbicide injury. Currently our understanding of the mechanisms involved in the protection of plants by safeners is not well defined; therefore, investigations were conducted to elucidate the mechanism(s) of action of the oxime ether safeners. Molecular comparisons of selected herbicide-safener combinations using computer-aided molecular modeling revealed that the chemical structures of safeners and herbicides are very similar at the molecular level; and, indicate that these compounds could bind at the same active

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14

Vallotton, Nathalie. "Effect assessment of fluctuating exposure of herbicides with different modes of action on algae /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17461.

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15

Cooley, William Edward. "Comparative studies on the modes of action of SC-0224 and glyphosate." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54493.

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The biological actions of the herbicides SC-0224 (trimethylsulfonium carboxymethylaminomethylphosphonate) and glyphosate [N-(phosphonomethyl)glycine] (PMG) were compared. In each study trimethylsulfonium iodide (TMS-I) was included as a treatment because the trimethylsulfonium ion is a constituent of the SC-0224 molecular structure. In inflated duckweed (Lemna gibba L.), both formulated and technical grade forms of SC-0224 were found to be much more phytotoxic to duckweed than either formulated or technical grade forms of glyphosate. The growth inhibition caused by glyphosate was partially pr

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16

El, Jay Aïcha. "Action des herbicides inhibiteurs du photosysteme ii sur quelques especes phytoplanctoniques lacustres en cultures monospecifiques et mixtes." Paris 6, 1998. http://www.theses.fr/1998PA066114.

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Les effets de quatre herbicides inhibiteurs du photosysteme ii (atrazine, simazine, diuron et isoproturon) sont etudies chez quelques especes phytoplanctoniques lacustres appartenant a la classe des chlorophycees (chlorella vulgaris, pandorina morum, pediastrum duplex, selenastrum capricornutum et staurastrum sebaldii) et des diatomees (navicula accomoda et synedra delicatissima). L'action a court terme des herbicides est evaluee, par la mesure des modifications induites au niveau des cinetiques d'induction de fluorescence et a long terme par la mesure des perturbations de la croissance des cu

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17

Mayonado, David James. "Field, greenhouse, and laboratory studies on the efficacy and action of the herbicides SC-0051 and SC-0774." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53586.

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SC-0051 and SC-0774 are two experimental herbicides of undisclosed chemistry. A three year field study was conducted to evaluate SC-0051 and SC-0774 for weed control in conventional and no-till corn in Virginia. SC-0051 applied preemergence or postemergence, controlled common lambs-quarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.) horseweed (Conyza canadensis (L.) Cronq.), common chickweed (Stellaria media (L.) Vill. and was safe to corn. SC-0051 did not control smooth pigweed (Amaranthus hybridus L.) or giant foxtail (Setaria faberi Herrm.). SC-0774 effectively cont

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18

Mona, Sobhi. "Mode d'action cellulaire de séries de phenylcarbamates herbicides." Grenoble 1, 1987. http://www.theses.fr/1987GRE10105.

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Un groupe de 45 derives appartenant a la famille des carbamates a ete etudie, pour ses effets herbicides. Ce groupe contient des n-phenylcarbamates d'isopropyle, d'ethyle substitue, de phenyle et des biscarbamates. Dans une premiere partie ont ete analyses les effets de tous ces composes sur le transfert electronique associe a l'activite photosynthetique. . .

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19

Meschede, Dana Kátia [UNESP]. "Efeito do glyphosate e sulfumeturon-metil na fisiologia da cana-de-açúcar." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/99922.

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Made available in DSpace on 2014-06-11T19:30:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-07-02Bitstream added on 2014-06-13T19:19:09Z : No. of bitstreams: 1 meschede_dk_dr_botfca.pdf: 453157 bytes, checksum: 6b9492f4657f3740579e4ee8f73a6dd2 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>As rotas em que atuam os herbicidas devem ser fundamentais para o crescimento e desenvolvimento vegetal, pois o seu bloqueio deve promover a paralisação do crescimento ou a morte das plantas. De modo análogo, o bloqueio parcial destas rotas, com uso de baixas do

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20

Heini, Julia [Verfasser], and Roland [Akademischer Betreuer] Gerhards. "Studies on the efficacy, composition and mode of action of an ethoxylated soybean oil adjuvant for herbicides / Julia Heini. Betreuer: Roland Gerhards." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2013. http://d-nb.info/1030315892/34.

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21

El, Ibaoui Hamid. "Contribution a l'etude des mecanismes de l'absorption de deux herbicides phloeme-mobiles (amitrole, glyphosate) et d'un fongicide non phloeme-mobile (iprodione) par les tissus foliaires de feve (vicia faba l. )." Poitiers, 1987. http://www.theses.fr/1987POIT2252.

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Nous avons compare l'absorption et le largage de deux herbicides phloeme-mobile (glyphosate, amitrole) et d'un fongicide non phloeme-mobile (iprodione) par des tissus foliaires de feve (vicia faba l. ) depourvus de leur epiderme inferieur. Le modele "disque foliaire" qui permet une visualisation des evenements localises au niveau du phloeme semble mieux adapte a l'etude de la systemie liberienne que les modeles "parenchymes" frequemment utilises. Les autoradiographies montrent que le glyphosate et l'amitrole sont localises preferentiellement dans les nervures, alors que le marquage du a l'ipro

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22

Haas, Eva Katharina. "Clomazone action and chlorophyll biosynthesis." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389121.

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23

Davies, Joanna. "Studies into the mode of action of herbicide safeners." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261285.

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24

Wightman, Patricia S. "Studies on the mode of action of diflufenican in wheat, barley and selected weed species." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303313.

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25

Buckley, Paul L. "The mode of action of the herbicide isoxaflutole on plant metabolism." Thesis, Lancaster University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403798.

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26

Chapman, Helen. "Herbicide safener mode of action in wheat and rice : a proteomic approach." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438293.

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27

Koschmieder, Julian [Verfasser], and Peter [Akademischer Betreuer] Beyer. "The poly-cis pathway of carotene desaturation: enzymology, herbicide action and retrograde signaling." Freiburg : Universität, 2017. http://d-nb.info/1141053543/34.

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28

O'Looney, Nichola. "The mode of action of the herbicide oxaziclomefone, an inhibitor of cell expansion." Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/12719.

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Oxaziclomefone [OAC; IUPAC: 3-(3,5-dichlorophenyl)-1-methylethyl)-2,3-dihydro-6-methyl-5-phenyl-4H-1,3-oxazin-4-one] is a new herbicide recently released onto the market by Aventis, in Japan. OAC is very effective in controlling <i>Echinochloa</i> sp., a weed which is particularly prevalent in paddy fields and which can substantially reduce the yield of rice. OAC inhibits growth of graminaceous monocots but is relatively ineffective on most dicots. OAC was found to inhibit cell expansion in maize cell suspension cultures (CSCs) and roots within 8 h of exposure and has an ID<sub>50</sub> (inhib

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29

Derrick, Peter Michael. "An investigation into the mode of action of the herbicide M and B 39279." Thesis, Nottingham Trent University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327791.

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30

Triolet, Marion. "Identification et caractérisation de candidats d'origine naturelle à action herbicide pour contrôler les adventices." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK032.

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Un projet visant à identifier des mycoherbicides pour lutter contre les adventices a été initié entre l’UMR Agroécologie de Dijon et la société DE SANGOSSE® (Agen). Trois volets ont structuré ce projet à l’issue d’une collecte de prélèvement de 475 plantes représentatives de 23 espèces d’adventices symptomatiques et asymptomatiques en Bourgogne et en Beauce. Le 1er volet reposait sur une approche de type metabarcoding (technologie Illumina), pour évaluer et comparer la diversité des communautés fongiques endophytes des plantes symptomatiques et asymptomatiques. 542 genres fongiques ont ainsi é

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31

Vencill, William K. "Field and laboratory investigations on the efficacy, selectivity, and action of the herbicide clomazone." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/77751.

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Clomazone is a recently introduced herbicide for the selective control of grass and broadleaf weeds in soybeans. Field studies were conducted in full-season no-till soybeans to determine the efficacy of clomazone as a preplant and preemergence herbicide. Clomazone applied preemergence provided large crabgrass (Digitaria sanguinalis L.) control equivalent to that of oryzalin applied preplant or preemergence and provided better control of several broadleaf weeds. Control from preplant applications of clomazone was not adequate. Preemergence and preplant incorporated applications of clomazone wer

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32

Benevides, Norma. "Relation entre l'activité herbicide de quelques composés et leur liaison à des protéines ou à des structures membranaires isolées." Grenoble 1, 1987. http://www.theses.fr/1987GRE10143.

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Le travail presente dans ce memoire est une etude des relations pouvant exister entre l'activite de composes herbicides inhibiteurs de la division cellulaire chez les vegetaux et leur liaison a des proteines (tubuline, serum albumine bovine=sab) ou a des structures membranaires (thylakoides). Nous avons constitue une serie d'inhibiteurs connus de la division cellulaire (propyzamide, butraline, pentachlorophenol=pcp, colchicine et deux phenylcarbamates: prophame et chlorprophame=cipc). Nous avons verifie leur efficacite et compare celle-ci a l'activite de 19 pyridilcarbamates nouveaux (. . . )

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33

Pes, Maiquel Pizzuti. "METABÓLITOS SECUNDÁRIOS OBTIDOS DE Diaporthe sp. APLICADOS PARA O CONTROLE DE PLANTAS DANINHAS." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/7606.

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Weed plants are currently one of the main factors to restrain crop yield worldwide. The mycoherbicides are considered an important alternative to aim weed plants management, because of its efficiency of control and low environmental impact. The aim of the present study was to evaluate the herbicidal effect of secondary metabolites of the fungus Diaporthe sp. isolated from Solanum americanum plant to the control of different species of weeds and crops. In this sense, bioassays were carried with pre-emergence application (primary assessment) and post-emergency aplication (secondary assessment) p

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34

Stoeckel, James A. "Herbicides, Reservoirs, and Daphnia Reproduction: Is There a Cost to Male Production?" Miami University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1186153732.

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35

Mardini, Fadi Al Begube Bernard. "Etude de l' adsorption du pesticide Bromacil sur charbon actif en poudre en milieu aqueux." Poitiers : I-Médias, 2008. http://08.edel.univ-poitiers.fr/theses/index.php?id=1043.

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36

Mardini, Fadi Al. "Etude de l'adsorption du pesticide Bromacil sur charbon actif en poudre en milieu aqueux : effet compétiteur des matières organiques naturelles." Poitiers, 2008. http://theses.edel.univ-poitiers.fr/theses/2008/AlMardini-Fadi/2008-AlMardini-Fadi-These.pdf.

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L’objectif de ce doctorat était de réaliser une étude détaillée des phénomènes d’adsorption du Bromacil (herbicide) sur un charbon actif en poudre, CAP SA-UF, à pH 7,8 et à 20 °C. L’application de plusieurs modèles d’isotherme d’équilibre mono-soluté a globalement montré que l’adsorption du Bromacil se fait sur deux types de sites. Les travaux sur la cinétique d’adsorption ont montré qu’il n’est pas possible de préciser a priori si la diffusion ou la réaction de surface est cinétiquement déterminante. Le modèle de réaction de surface du pseudo-second ordre s’applique particulièrement bien et c

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37

Venner, Katelyn. "Evaluating methiozolin programs for golf putting greens and investigating potential modes of action." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56733.

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Annual bluegrass is a winter annual grass that is problematic on golf putting greens due to its light green color, prolific seedhead production and intolerance to stress. On creeping bentgrass putting greens, herbicides for annual bluegrass control are limited. A new herbicide, methiozolin, developed by Moghu Research Center, LLC, in Daejeon, South Korea, safely and selectively controls annual bluegrass in creeping bentgrass and several other turfgrass species. Methiozolin typically controls annual bluegrass over several weeks, allowing desirable turfgrass time to grow into areas previously in

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38

Taylor, David Charles Carleton University Dissertation Biology. "Synthesis and metabolism of a series of chloro-phenylalanines in relation to their potential herbicidal action." Ottawa, 1986.

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39

Smith, C. "The mode of action and selectivity of M&B 34790 and M&B 30755 in cotton and four weed species (Abutilon theophrasti, Echinochloa crusgalli, Polygonum lapathifolium, and Portulaca oleracea)." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381154.

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40

Mohd, Ali. "Adsorption et électrosorption d'herbicides et de tensioactifs sur charbons actifs en grains." Pau, 1996. http://www.theses.fr/1996PAUU3028.

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Ce travail relatif a l'adsorption et l'electrosorption (adsorption sous potentiel impose) de polluants sur charbons actifs en grains comporte trois parties : la premiere partie a pour but d'etudier l'influence sur l'interaction adsorbat-adsorbant de la nature physique et chimique du charbon actif. Les resultats obtenus, par les methodes de titrage de boehm, de chromatographie gazeuse inverse et d'une combination de ces deux methodes, ont permis d'identifier separement l'effet sur les forces d'interaction de la porosite et des groupements fonctionnels. La deuxieme partie est consacree a l'etude

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41

Pinneh, Elizabeth Cassandra. "Targeting a promising new herbicide mode of action : chemical and genetic approaches to elucidate the role of IPC synthase in plants." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12643/.

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Worldwide there are currently 479 recorded unique cases of herbicide resistant weeds, with 251 species (146 dicots and 105 monocots). According to current records, weeds have developed resistance to 22 of the 25 known herbicide sites of action and to 157 different herbicides. Research into sphingolipid synthesis has revealed a potential novel site of action involving the non-mammalian enzyme inositol phosphorylceramide synthase (IPCS). Two approaches to understanding the function of the enzyme in plants have been employed in this study. The genetic approach, which involves the overexpression a

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42

Nilufar, Fahmida. "Fate and transport of herbicides in soil in the presence of surfactants in irrigation water." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97982.

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In many countries around the world, municipal sewage and industrial wastewaters are typically treated, or sometimes only partially treated, prior to their discharge into surface waters. A major anionic surfactant, Linear Alkyl benzene Sulfonate (LAS), and a degraded product of a non-ionic surfactant, Nonylphenol (NP), are frequently found in municipal wastewaters. When wastewater containing such surfactants and their degraded products is used for irrigation, it can have an effect on the sorption/desorption and movement of pesticides in soils. Therefore, a lysimeter study was conducted, in summ

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Coret, Joe͏̈l. "Contribution à l'étude de l'effet des surfactants sur le transfert de matières actives herbicides à travers les cuticules végétales." Grenoble 1, 1993. http://www.theses.fr/1993GRE10005.

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Nous avons mesure l'effet de quelques surfactants non-ioniques sur le transfert de deux matieres actives herbicides a travers des cuticules isolees. Pour expliquer les differences d'effet entre les surfactants, nous avons etudie, d'une part, la diffusion de quelques surfactants a travers des cuticules isolees, et, d'autre part, quelques consequences physico-chimiques des surfactants au niveau de la cuticule et au niveau de la matiere active. Nous avons constate que l'influence de la structure des surfactants sur le transfert de la matiere active est fonction de sa nature chimique. Nous avons c

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Riyahi, Benzakour Jamila. "Étude du mode d'action de quelques pesticides sur le métabolisme énergétique du soja (glycine Max L. )." Nancy 1, 1988. http://www.theses.fr/1988NAN10253.

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Les mitochondries prises comme révélateurs de l'activité de pesticides ont été extraites de trois types de tissus (cotyledons, feuilles et racines). Les trois types de pesticides utilisés (herbicides 2,4-D et pyrifenops, fongicides aacl ou sels d'alkylammonium) agissent comme découplants-inhibiteurs sur les mitochondries. Les composés du groupe AACL sont les plus puissants et les différences d'action entre mitochondries de tissus chlorophyllien et racinaire semblent provenir de la présence d'une voie de transport d'électrons résistante au cyanure dans les tissus photosynthétiques

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Bamba, Drissa. "L'élimination du diuron dans l'eau à partir des ressources naturelles de la côte d'Ivoire : photocatalyse solaire et adsorbants carbones à base de coques de noix de coco." Thesis, Metz, 2007. http://www.theses.fr/2007METZ048S/document.

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Nos recherches ont porté sur l’élimination du diuron en solution aqueuse, soit par photocatalyse sous irradiation artificielle et solaire avec le TiO2, soit par adsorption sur le charbon actif préparé à partir de coques de noix de coco.L’influence de certains paramètres tels que la masse du catalyseur, la masse du polluant en solution ainsi que la présence des ions nitrate, ammonium et sulfate a été étudiée. Nous avons mis en évidence que la disparition du diuron suivait le modèle de Langmuir – Hinshelwood observé pour de nombreux polluants. La présence d’ions en général influence peu l’activi

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Chaib, Slimane. "Caractérisation de composés bio-actifs issus de la diversité micro-algale par métabolomique différentielle et déréplication assistée par la mise en réseaux de similarités spectrales (ALL DREAM)." Thesis, Perpignan, 2020. http://www.theses.fr/2020PERP0031.

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Face aux préoccupations du grand public sur l’utilisation des pesticides de synthèse, la législation Européenne incite au développement de nouvelles stratégies afin d’évaluer et de limiter les impacts potentiels des différentes pratiques agriculturales sur l’environnement. Ainsi, le développement de nouvelles approches telles que l’utilisation de produits de bio-contrôle est en plein essor. Dans ce contexte, la biomasse issue de la production de micro-algues est une alternative à mettre en avant. En effet, les micro-algues constituent, au sein du milieu marin, une source variée de molécules bi

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SERRE, ISABELLE. "Comportement d'une serie d'esters de l'acide oleique sur cuticules vegetales et effets sur la penetration foliaire d'herbicides." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10244.

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Les esters d'huiles vegetales sont des adjuvants efficaces de certains herbicides. Le comportement d'une serie d'esters de l'acide oleique, les oleates de methyle, butyle, octyle, dodecanyle et octadecanyle, choisis comme modeles, a ete etudie sur trois especes vegetales dont les cuticules presentent des cires epicuticulaires cristallines (pois, pisum sativum l. Et orge, hordeum vulgare l. ) ou amorphes (gaillet, galium aparine l. ). La penetration des cinq esters, sur pois et sur orge, est importante. Leur degradation dans la feuille est totale apres 27 heures. Les taux de penetration des est

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Elleingand, Eric. "Réactivité du radical tyrosinyle de la ribonucléotide réductase : application à la recherche de nouveaux inhibiteurs." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10093.

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La ribonucleotide reductase (rnr) est une enzyme clef qui catalyse la synthese des desoxyribonucleotides, precurseurs de la synthese de l'adn. La petite sous-unite de la rnr de classe i, nommee r2, contient un radical tyrosinyle essentiel pour son activite. Par consequent les piegeurs de radicaux sont de potentiels agents anti-proliferatifs. La structure tridimensionnelle de r2 montre que le radical est enfoui a l'interieur de la proteine. Dans cette these nous avons montre a l'aide de mutants diriges de r2, que la reactivite de ce radical vis a vis des phenols, hydrazines, dithionite, hydroxy

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Almasri, Hanine. "Toxicologie des mélanges de pesticides chez des abeilles exposées à un agent pathogène : action combinée de l'agent pathogène Nosema ceranae, de l'insecticide imidaclopride, du fongicide difénoconazole et de l'herbicide glyphosate Mixtures of an insecticide, a fungicide and a herbicide induce high toxicities and systemic physiological disturbances in winter Apis mellifera honey bees Toxicity of the pesticides imidacloprid, difenoconazole and glyphosate alone and in binary and ternary mixtures to winter honey bees: effects on survival and antioxidative defenses Toxicological status changes the susceptibility of the honey bee Apis mellifera to a single fungicidal spray application Physiological effects of the interaction between Nosema ceranae and sequential and overlapping exposure to glyphosate and difenoconazole in the honey bee Apis mellifera." Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0722.

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Les données scientifiques actuelles suggèrent un déclin de la diversité et de l’abondance des insectes, y compris les abeilles domestiques Apis mellifera. Ces dernières sont confrontées à de fortes pertes de colonies dans plusieurs régions du monde telles que l’ouest de l’Europe et les États-Unis. De nombreuses études suggèrent que l’origine du déclin des colonies d’abeilles est multicausale et identifient les pesticides et les agents pathogènes comme étant les principaux contributeurs à ce déclin. La co-exposition des abeilles à de multiples pesticides et l’infection par plusieurs pathogènes

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Mohammad, Ali Monadjemi Shirin. "Phototransformation de matières actives à la surface des végétaux . Mécanismes des réactions directes et sensibilisées." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00836760.

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La phototransformation des matières actives à la surface des plantes après pulvérisation a une influence considérable sur l'efficacité des traitements. Dans ce travail, l'ensemble des réactions photochimiques se produisant sur des supports modèles des cires végétales dans des conditions proches des conditions environnementales ont été étudiées dans le cas d'un fongicide (le chlorothalonil) et d'un herbicide (la cycloxydime). Nous avons considéré les réactions photochimiques induites par l'absorption de lumière par les composés eux-mêmes et celles faisant intervenir des sensibilisateurs comme l

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