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Letteratura scientifica selezionata sul tema "Phosphite"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 11 marzo 2023

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Articoli di riviste sul tema "Phosphite"

1

McDonald, Allison E., Julie O. Niere e William C. Plaxton. "Phosphite disrupts the acclimation of Saccharomyces cerevisiae to phosphate starvation". Canadian Journal of Microbiology 47, n. 11 (1 novembre 2001): 969–78. http://dx.doi.org/10.1139/w01-099.

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The influence of phosphite (H2PO3) on the response of Saccharomyces cerevisiae to orthophosphate (HPO42; Pi) starvation was assessed. Phosphate-repressible acid phosphatase (rAPase) derepression and cell development were abolished when phosphate-sufficient (+Pi) yeast were subcultured into phosphate-deficient (Pi) media containing 0.1 mM phosphite. By contrast, treatment with 0.1 mM phosphite exerted no influence on rAPase activity or growth of +Pi cells. 31P NMR spectroscopy revealed that phosphite is assimilated and concentrated by yeast cultured with 0.1 mM phosphite, and that the levels of sugar phosphates, pyrophosphate, and particularly polyphosphate were significantly reduced in the phosphite-treated Pi cells. Examination of phosphite's effects on two PHO regulon mutants that constitutively express rAPase indicated that (i) a potential target for phosphite's action in Pi yeast is Pho84 (plasmalemma high-affinity Pi transporter and component of a putative phosphate sensor-complex), and that (ii) an additional mechanism exists to control rAPase expression that is independent of Pho85 (cyclin-dependent protein kinase). Marked accumulation of polyphosphate in the Δpho85 mutant suggested that Pho85 contributes to the control of polyphosphate metabolism. Results are consistent with the hypothesis that phosphite obstructs the signaling pathway by which S. cerevisiae perceives and responds to phosphate deprivation at the molecular level.Key words: Saccharomyces cerevisiae, phosphite, phosphate starvation, PHO regulon.

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2

Inoue, Hidenari, Hiromi Akahori, Yuri Ohno, Katsuo Nakazawa, Yoshimune Nonomura, Naoki Yoshioka, Gernot Heckmann e Ekkehard Fluck. "Axial Coordination of Phosphine or Phosphite to Iron(III) Chlorophyll a". Zeitschrift für Naturforschung B 50, n. 8 (1 agosto 1995): 1222–28. http://dx.doi.org/10.1515/znb-1995-0817.

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The adduct formation of iron(III) chlorophyll a with phosphines or phosphites has been studied by spectroscopic methods. The red-shift in the Soret and Q bands caused by the axial coordination of phosphine or phosphite to iron(III) chlorophyll a is an evidence for the autoreduction of the central iron(III) ion. The 31P{1H} NMR spectrum of bis-adducts measured in the presence of excess phosphine or phosphite ligands gave a single peak in the down field range compared to that of the corresponding free ligand. The ESR and X-ray photoelectron spectra have revealed that the central iron atom of the bis-adduct of iron chlorophyll a with phosphines or phosphites is divalent and in the low-spin state. The axial coordination of phosphine or phosphite influences the electronic configuration of the central iron atom and the macrocyclic chlorine ligand to induce the autoreduction of the central iron(III) ion.

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3

Villa, Eric, Justin Cross e Thomas Albrecht-Schmitt. "New Uranyl Open Framework and Sheet Compounds Formed via In-Situ Protonation of Piperazine by Phosphorous Acid". Minerals 8, n. 11 (1 novembre 2018): 497. http://dx.doi.org/10.3390/min8110497.

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Two new uranyl compounds were hydrothermally synthesized employing piperazine as an organic templating agent. The piperazine was protonated in-situ by phosphorous acid, forming the piperazinium dication featured in these compounds. The two new structures presented here are a uranyl phosphite 2D sheet and a 3D uranyl mixed phosphite–phosphate network with cation occupied channels. Both included strong hydrogen bonding from the piperazinium cation to the uranyl phosphite or mixed phosphite–phosphate network. These two structures can be reliably formed through careful control of pH of the starting solution and the reaction duration. The piperazinium uranyl phosphite compound was the latest in a family of uranyl phosphites, and demonstrates the structural versatility of this combination. The mixed phosphite–phosphate compound builds on hydrothermal redox chemistry, illustrating the variety of compounds that can be isolated by exploiting in-situ redox processes to elucidate new uranium structure types.

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4

Oka, Yuji, Nadia Tkachi e Mishael Mor. "Phosphite Inhibits Development of the Nematodes Heterodera avenae and Meloidogyne marylandi in Cereals". Phytopathology® 97, n. 4 (aprile 2007): 396–404. http://dx.doi.org/10.1094/phyto-97-4-0396.

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Phosphonic acid (H3PO3) solutions were applied to wheat or to bristle oat as soil drenches before inoculation with juveniles of the sedentary, endoparasitic nematodes Heterodera avenae or Meloidogyne marylandi. All the solutions, which were pH adjusted and added at levels as low as 0.63 mg of phosphite (HPO32-) per plant, reduced the numbers of H. avenae females and M. marylandi egg masses. Phosphate (PO43-), applied as potassium phosphate at the same concentrations, did not reduce the number of female nematodes on the wheat. Addition of phosphate to the phosphite solutions did not change the inhibitory effect of phosphite on H. avenae, but it reduced phosphite's effect on M. marylandi. Phosphite also reduced the number of H. avenae females when applied as many as 20 days after addition of nematodes. The phosphite treatment did not prevent M. marylandi juveniles from penetrating wheat roots or inducing giant cells. However, phosphite inhibited giant cell development: 14 days after inoculation, the giant cells in the phosphite-treated wheat were almost completely vacuolated, whereas those in untreated wheat contained dense cytoplasm.

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5

Förster, H., J. E. Adaskaveg, D. H. Kim e M. E. Stanghellini. "Effect of Phosphite on Tomato and Pepper Plants and on Susceptibility of Pepper to Phytophthora Root and Crown Rot in Hydroponic Culture". Plant Disease 82, n. 10 (ottobre 1998): 1165–70. http://dx.doi.org/10.1094/pdis.1998.82.10.1165.

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Tomato and pepper plants were grown hydroponically in a greenhouse using phosphate or technical and commercial formulations of phosphite as sources of phosphorus nutrition to determine the effects on plant development and susceptibility to Phytophthora root and crown rot. Phosphite-treated tomato and pepper plants were deficient of phosphate and developed phosphorus-deficiency symptoms. Growth of plants (leaf area and leaf, stem, and root dry weights) that were fertilized with phosphite was significantly (P < 0.05) reduced compared with phosphate-fertilized plants. In Phytophthora capsici–inoculated pepper plants, incidence of Phytophthora crown rot was significantly reduced in phosphite-treated plants compared with no phosphorus or phosphate-treated plants. Incidence of crown rot in pepper plants treated with 1 mM phosphate plus 0.3 mM phosphite was intermediate between plants treated with only phosphite (1 mM or 0.1 mM) and plants treated with phosphate (1 mM).

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6

Ávila, Fabricio William, Valdemar Faquin, Douglas Ramos Guelfi Silva, Carla Elisa Alves Bastos, Nilma Portela Oliveira e Danilo Araújo Soares. "Phosphite as phosphorus source to grain yield of common bean plants grown in soils under low or adequate phosphate availability". Ciência e Agrotecnologia 36, n. 6 (dicembre 2012): 639–48. http://dx.doi.org/10.1590/s1413-70542012000600006.

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The effects of foliar and soil applied phosphite on grain yield in common bean (Phaseolus vulgaris L.) grown in a weathered soil under low and adequate phosphate availability were evaluated. In the first experiment, treatments were composed of a 2 x 7 + 2 factorial scheme, with 2 soil P levels supplied as phosphate (40 e 200 mg P dm-3 soil), 7 soil P levels supplied as phosphite (0-100 mg P dm-3 soil), and 2 additional treatments (without P supply in soil, and all P supplied as phosphite). In the second experiment, treatments were composed of a 2 x 3 x 2 factorial scheme, with 2 soil phosphate levels (40 e 200 mg P dm-3 soil), combined with 3 nutrient sources applied via foliar sprays (potassium phosphite, potassium phosphate, and potassium chloride as a control), and 2 foliar application numbers (single and two application). Additional treatments showed that phosphite is not P source for common bean nutrition. Phosphite supply in soil increased the P content in shoot (at full physiological maturity stage) and grains, but at the same time considerably decreased grain yield, regardless of the soil phosphate availability. Foliar sprays of phosphite decreased grain yield in plants grown under low soil phosphate availability, but no effect was observed in plants grown under adequate soil phosphate availability. In general, foliar sprays of phosphate did not satisfactorily improve grain yield of the common bean plants grown under low soil phosphate availability.

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7

Deliy, Irina, Ivan Shamanaev, Pavel Aleksandrov, Evgeny Gerasimov, Vera Pakharukova, Evgeny Kodenev, Ilya Yakovlev, Olga Lapina e Galina Bukhtiyarova. "Support Effect on the Performance of Ni2P Catalysts in the Hydrodeoxygenation of Methyl Palmitate". Catalysts 8, n. 11 (3 novembre 2018): 515. http://dx.doi.org/10.3390/catal8110515.

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The effect of support nature, SiO2 and γ-Al2O3, on physicochemical and catalytic properties of nickel phosphide catalysts in methyl palmitate hydrodeoxygenation (HDO) has been considered. Firstly, alumina-supported nickel phosphide catalysts prepared by temperature-programmed reduction method starting from different precursors (phosphate–Ni(NO3)2 and (NH4)2HPO4 or phosphite–Ni(OH)2 and H3PO3) were compared using elemental analysis, N2 physisorption, H2-TPR, XRD, TEM, NH3-TPD, 27Al and 31P MAS NMR techniques and catalytic experiments. The mixture of nickel phosphide phases was produced from phosphate precursor on alumina while using of phosphite precursor provides Ni2P formation with the higher activity in methyl palmitate HDO. Besides, the comparative study of the performances of Ni2P/SiO2 and Ni2P/Al2O3 catalysts demonstrates the apparent superiority of alumina-supported Ni2P in the methyl palmitate hydrodeoxygenation. Considering the tentative scheme of methyl palmitate transformation, we proposed that cooperation of Ni2P and acid sites on the surface of alumina provides the enhanced activity of alumina-supported Ni2P through the acceleration of acid-catalysed hydrolysis.

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8

Szirtes, L., A. M. Szeleczky e E. Kuzmann. "Zirconium phosphate–phosphite containing silica". Solid State Ionics 97, n. 1-4 (1 maggio 1997): 223–26. http://dx.doi.org/10.1016/s0167-2738(97)00045-3.

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9

Guidone, Stefano, Fady Nahra, Alexandra M. Z. Slawin e Catherine S. J. Cazin. "Ruthenium indenylidene “1st generation” olefin metathesis catalysts containing triisopropyl phosphite". Beilstein Journal of Organic Chemistry 11 (1 settembre 2015): 1520–27. http://dx.doi.org/10.3762/bjoc.11.166.

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The reaction of triisopropyl phosphite with phosphine-based indenylidene pre-catalysts affords “1st generation” cis-complexes. These have been used in olefin metathesis reactions. The cis-Ru species exhibit noticeable differences with the trans-Ru parent complexes in terms of structure, thermal stability and reactivity. Experimental data underline the importance of synergistic effects between phosphites and L-type ligands.

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10

Liu, Kunlu, Min Wang, Yubo Zhou, Hongxiang Wang, Yudong Liu, Lu Han e Weiwei Han. "Exploration of the cofactor specificity of wild-type phosphite dehydrogenase and its mutant using molecular dynamics simulations". RSC Advances 11, n. 24 (2021): 14527–33. http://dx.doi.org/10.1039/d1ra00221j.

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Più fonti

Tesi sul tema "Phosphite"

1

Deerenberg, Sirik. "Stereogenic phosphorus containing phosphine-phosphite ligands in asymmetric catalysis". [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/57171.

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2

Gudmunsen, David. "The synthesis, coordination chemistry and catalytic applications of phosphinite, phosphonite and phosphite ligands containing perfluoroalkyl substituents". Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/30048.

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A review is presented of the development and application of liquid-liquid biphase systems in homogeneous catalysis and the concept and application of fluorous biphase systems (FBS) in catalysis. Novel monodentate phosphorus(III) ligands of general formula PhxP(OC6H4-4-C6F,3)3.x and PhCHF-* (x = 0, 1 or 2), and the phosphite ligands P(OC6H4-4-C8Fl7)3, P(OC6H4-4-C10F2i)3, P(OC6H4-3-C6F13)3 and P(OC6H4-2-C6Fi3)3 have been synthesised and fully characterised by 'H, 19F and 3,P{1H} NMR spectroscopy, mass spectrometry and elemental analysis. The monodentate phosphinite, phosphonite and phosphite ligands (L) have been reacted with a variety of transition metal complexes to form complexes of the type cis- and trans- MC 2L2 (M = Pt, Pd), cw- PtCl2(PEt3)L , M(n5-C5Me5)Cl2L (M = Ir, Rh) and RI1CIL3 . The complexes have been isolated and characterised using analytical techniques including H, 19F and 31P{!H} NMR spectroscopy, mass spectrometry, IR spectroscopy, X-ray crystallography and elemental analysis. The steric and electronic influences of the perfluoroalkyl substituents on the chemical and physical properties of the metal complexes have been assessed by comparison of their spectroscopic and structural data with that for their related protio complexes. Preliminary catalytic studies involving P(OC6H4-4-C6Fi3)3 as a modifying ligand in the rhodium-catalysed hydroformylation of 1-hexene and 1-nonene under FBS conditions have been undertaken. The influence of the perfluoroalkyl substituents on the rate of reaction, product selectivity and catalyst/product separation has been examined. The synthesis of bidentate phosphonite and phosphite ligands containing perfluoroalkyl substituents has been investigated. The derivatised bidentate phosphonite ligands (C6F13-4-C6H40)2PCH2CH2P(OC6H4-4-C6F, 3)2 and {5,5' - (C6F13)2-2,2,-02C,2H6}PCH2CH2P{2,2,-02C,2H6-5,5,-(C6F13)2} (L-L) have been reacted with transition metal complexes to form coordination complexes of the type PtCl2(L-L) and Rh(u-C1)(L-L)]2.

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3

Auckland, Clare. "The dilution of phosphite in rapidly growing plants and how soil and plant phosphate levels interact with phosphite and its ability to control Phytophthora cinnamomi". Thesis, Auckland, Clare (2002) The dilution of phosphite in rapidly growing plants and how soil and plant phosphate levels interact with phosphite and its ability to control Phytophthora cinnamomi. Honours thesis, Murdoch University, 2002. https://researchrepository.murdoch.edu.au/id/eprint/32633/.

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The soil borne plant pathogen Phytophthora cinnamomi has irreversibly altered the make-up and diversity of the plant communities found in Australia. Recently, the fungicide phosphite has been used to effectively reduce the impact of this pathogen in natural plant communities. However, little is known (a) about how rapidly phosphite is diluted in the tissues of rapidly growing plants and (b) how soil and plant phosphate levels interact with phosphite and its ability to induce host-resistant responses when challenged by P. cinnamomi. This study examined the effects of different phosphite rates (0, 24 and 48 kg/ha phosphite) applied as a mist application on three size classes of Banksia grand is, as well as the interaction of phosphate status on two Eucalyptus marginata forest vegetation types differing in soil phosphate status with phosphite. It also examined, under controlled glasshouse conditions, the effects different soil phosphate levels had on in planta phosphite and phosphate levels in B. hookeriana, and the subsequent control of P. cinnamomi. This study was the first to look at the role of phosphate in the soil and the plant, and its interaction with phosphite and the subsequent control of P. cinnamomi in planta. Results from the field trial indicated that phosphate in the soil did not play a role in the reducing the uptake of phosphite by the plant. It did suggest that stem and root colonisation was increased when phosphate in the soil was more plentiful. Further research is needed into this area. This study was also the first to look at the distribution of phosphite in planta. The highest concentration of phosphite was in the leaves, followed by the stem and then roots. Ph9sphite in the plant tissue was found to increase as the phosphite applied to 5 the plants increased. Plants classed as seedlings showed more phytotoxic symptoms than the intermediate and semi-mature plants. The concentration of phosphite in the roots of the intermediate sized plants was more than double the amount found in the seedling and semi-mature plants. The concentration of phosphite in the whole plant, as well as in the leaves and stems per plant, increased as the plant size increased. This was supported by results that showed that as the dry weight of the leaves increased so did the amount of phosphite in the leaves. The same was seen with the dry weights of the stems and roots that correlated with phosphite in the stem and the roots, respectively. Lesions and P. cinnamomi colonisation in the stems of non-phosphite treated plants were more than double those in stems of plants treated with 24 and 48 kg/ha phosphite. There was very little difference in the visible lesion lengths and P. cinnamomi colonisation between plants treated with 24 and 48 kglha of phosphite even though plants sprayed with 48 kg/ha phosphite had significantly more phosphite in their tissues than plants sprayed with 24kg/ha phosphite. This suggests that the phosphite in the plant may have been metabolised into another substance and that this substance was acting on the pathogen and/or the plant to reduce colonisation. This was further supported by no observed correlation between phosphite in the plant tissue and the extent of colonisation or visible stem lesion caused by P. cinnamomi. This was contradictory to other results in this study (Chapter 2) that clearly showed that phosphite did restrict the colonisation of the pathogen. Further research is needed into the mode of action of phosphite. In the glasshouse trial, a non-invasive inoculation technique failed to infect B. hookeriana plants with the pathogen. However, this is likely due to very high ambient temperatures experienced during the trial, since a preliminary trial 18 days earlier resulted in extensive colonisation of all plants inoculated. As phosphate levels increased, stem colonisation by the pathogen increased in the presence of phosphite. There was no difference in the concentration of phosphite in the leaves. As phosphite applied increased, so did the concentration of phosphite in the root tissue. This study shows that phosphate does interact with phosphite and the subsequent expression of P. cinnamomi, and as phosphate levels increased in planta so did the extent of colonisation by the pathogen. The exact nature of this interaction is still unknown and further research is required to better understand the nature of this relationship.

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4

Phung, Quang Linh. "Synthèse de ligands chiraux de type phosphine-phosphite et phosphine-carbène N-hétérocyclique pour la catalyse asymétrique". Rouen, 2005. http://www.theses.fr/2005ROUES033.

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La catalyse organométallique est une méthode de choix pour la synthèse de composés chiraux. Afin d'atteindre une selectivité et efficacité élevées en catalyse asymétrique, plusieurs paramètres réactionnels doivent être optimisés, parmi lesquels le choix et la structure du ligand sont sans doute les points les plus importants. Nous avons développé deux familles de ligands bidentates de type phosphine-phosphite et phosphine-carbène N-hétérocyclique. Ces deux séries de ligands possèdent une caractéristique structurale commune, à savoir un centre asymétrique adjacent à la phosphine. Cette proximité du centre stéréogène et de l'atome de phosphore pourrait avoir un effet positif sur l'énantiodiscrimination. Les ligands phosphine-phosphites ont été testés en hydrogénation (ee jusqu'à 84%) et hydroformylation (pas d'induction asymétrique) asymétriques catalysées par le rhodium. Les ligands phosphine-carbènes N-hétérocycliques ont été testés en hydrogénation et hydrosilylation asymétriques catalysées à l'iridium (pas d'induction asymétrique), et avec des résultats prometteurs dans le couplage de Suzuki-Miyaura
Catalytic asymmetric synthesis using organometallic reagents has become one of the most active areas of research in modern organic synthesis. To achieve the highest levels of reactivity and selectivity in catalytic enantioselective reactions, several reactions parameters must be optimized. Among them, the selection and design of the chiral ligand is perhaps the most crucial step. We have developed two families of bidentate ligands : phosphine-phosphite and phosphine N-heterocyclic carbene. These two series of ligands have a chiral center to the α-position next to the phosphine moiety. This stereogenic α-position could be of great importance since the phosphorus atom is directly associated with the transition metal in the asymmetric reaction. Phosphine-phosphite ligands were tested in the Rh-catayzed asymmetric hydrogenation (ee up to 84%) and hydroformylation (no asymmetric induction). Phosphine N-heterocyclic carbene ligands were tested in the Ir-catalyzed asymmetric hydrogenation and hydrosilylation (no asymmetric induction), and with promising results in the Suzuki-Miyaura cross-coupling reaction

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5

Meiswinkel, Andreas. "Chirale Monophosphite als effiziente Liganden für die asymmetrische Hydrierung". [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968943152.

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6

Passays, Johan. "Nouveaux ligands mixtes de type phosphore / carbène N-hétérocyclique : synthèse et applications en catalyse asymétrique". Thesis, Rouen, INSA, 2011. http://www.theses.fr/2011ISAM0008.

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Une méthode simple et efficace a été développée pour la préparation de ligands bifonctionnels associant les motifs phosphine ou phosphite d'une part, et carbène Nhétérocyclique(NHC) ou imidazolium d'autre part. Dans un premier temps, une série de ligands diphénylphosphine-carbène chiraux portant un centre stéréogène en a de la phosphinea été développée à partir b-hydroxyesters. Une famille de ligands a ainsi été développée afin d'évaluer l'influence de l'encombrement stérique de différents groupements alkyles en a de la phosphine et de la nature des groupements aromatiques portés sur l'imidazole sur leur activité catalytique. L’étude s’est ensuite étendue à la synthèse de ligands de type dialkylphosphine carbène et phosphite-carbène. Ces différents ligands ont été complexés avec des métaux tels que l’iridium ou le rhodium de manière à en étudier l’activité en hydrogénation asymétrique
A straightforward method for the preparation of new bidentate ligands containing aphosphine or a phosphite and a carbene function was developed. Different phosphorus-imidazolium compounds were prepared according to this method. First, diphenylphosphine-NHC ligands featuring a stereogenic center a to the phosphine were synthesized from b-hydroxyesters. This strategy was then extended to the preparation of phosphite-imidazoliumand dialkylphosphine-imidazolium compounds. Complexation of these phosphorus-NHCligands with different metals like Ir or Rh was performed in order to study there catalytic properties in asymmetric hydrogenation

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7

李慧敏 e Huai-min Li. "Photochemical studies of binuclear platinum and rhodium complexes withbridging isocyanide, phosphite and phosphine ligands". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31231603.

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8

Sampson, Jacqueline Marie. "The extent of phosporus redox chemistry in west central Florida waters". Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4939.

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Phosphorus (P) has long been acknowledged as a vital nutrient for living organisms and is a key factor responsible for the fresh water eutrophication. Our understanding of the phosphorus cycle has been limited by: (1) the common assumption that all P in the environment occurs primarily as phosphates and (2) by the limited analytical methods available to identify P speciation. In an attempt to understand the distribution and chemistry of phosphorus within a freshwater system we must be able to identify individual P species. To this end, we used a coupled High Performance Liquid Chromatograph (HPLC) - Inductively Coupled Plasma Mass Spectrometer (ICPMS) to determine concentrations of orthophosphate (+5), phosphite (+3) and hypophosphite (+1) in aqueous samples using methods modified from IC techniques developed by Ivey & Foster (2005) and Pech, et al. (2009) and Atlas et al. (in prep). The identification of different P species provides insight pertaining to contamination, bioavailability and sustainability within a freshwater system. Thirty-two individual water samples were collected from six different bodies of freshwater in the Tampa Bay area between the months of November 2012 to March 2013. The freshwater samples collected were from river and pond/swamp water locations. Two sampling sites were chosen at each location. At each site, one sample was collected from the water's surface and a second sample was collected from the sediment pore water. When depth was sufficient a third sample was obtained from the midpoint between the surface and sediment. Analytical results show that redox reactions of P occur in all freshwater samples collected as identified by HPLC-ICP-MS analysis. Our data show that the distribution and concentration of reduced P is controlled primarily by pH, and secondarily by water circulation, ORP and sediment type. Our results also imply biologic influence as a potential primary control of reduced P flux. Additional samples must be collected in order to quantify and differentiate the processes controlling P speciation. The ability to identify P speciation raises many questions concerning the validity of current methods used to measure P; other forms of reduced P may be present. Additional sample analysis will be necessary to determine how and if reduced forms of P affect the P cycle.

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9

Horiuti, Toshihide. "Studies on Enantioselective Addition to C=C Bonds Catalyzed by Transition Metal-Phosphine-Phosphite Complexes". Kyoto University, 1997. http://hdl.handle.net/2433/202317.

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10

Li, Huai-min. "Photochemical studies of binuclear platinum and rhodium complexes with bridging isocyanide, phosphite and phosphine ligands /". [Hong Kong] : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12428541.

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Più fonti

Libri sul tema "Phosphite"

1

Spence, Hugh S. Investigation of a reported discovery of phosphate in Alberta. Ottawa: Govt. Print. Bureau, 1997.

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2

Jane, Knoth-Anderson, e United States. Environmental Protection Agency, a cura di. Triphenyl phosphite-induced ultrastructural changes in bovine adrenomedullary chromaffin cells. [Washington, D.C: U.S. Environmental Protection Agency, 1992.

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3

Jane, Knoth-Anderson, e United States. Environmental Protection Agency., a cura di. Triphenyl phosphite-induced ultrastructural changes in bovine adrenomedullary chromaffin cells. [Washington, D.C: U.S. Environmental Protection Agency, 1992.

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4

Jane, Knoth-Anderson, e United States. Environmental Protection Agency, a cura di. Triphenyl phosphite-induced ultrastructural changes in bovine adrenomedullary chromaffin cells. [Washington, D.C: U.S. Environmental Protection Agency, 1992.

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5

Lee, Sam. Synthesis and characterization of fluorescent-labelled oligoglycols by the phosphite-triester method. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1991.

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6

J, Cook P., Shergold J. H e International Geological Correlation Programme. Project 156 Phosphorites., a cura di. Phosphate deposits of the world. Cambridge: Cambridge University Press, 1986.

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7

Burnett, John L. Mineral commodity report, phosphate rock. Sacramento, Calif: California Dept. of Conservation, Division of Mines and Geology, 1985.

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8

Z, Serazetdinov D., a cura di. Kompleksnai͡a︡ pererabotka fosforitov i fiziko-khimicheskie issledovanii͡a︡ neorganicheskikh materialov. Alma-Ata: "Gylym", 1991.

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9

Burnett, John L. Mineral commodity report, phosphate rock. Sacramento, Calif: California Dept. of Conservation, Division of Mines and Geology, 1985.

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Hardy, Giles E. St. J., a cura di. The potential of the fungicide phosphite to control Phytophthora cinnamomi in native plant communities associated with mining. East Perth, WA: MERIWA, 2000.

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Capitoli di libri sul tema "Phosphite"

1

Pasek, Matthew A. "Phosphite". In Encyclopedia of Astrobiology, 1229. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1187.

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Pasek, Matthew A. "Phosphite". In Encyclopedia of Astrobiology, 1859. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1187.

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Pasek, Matthew A. "Phosphite". In Encyclopedia of Astrobiology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_1187-4.

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Gooch, Jan W. "Tricresyl Phosphite". In Encyclopedic Dictionary of Polymers, 764. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12105.

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Gooch, Jan W. "Tridecyl Phosphite". In Encyclopedic Dictionary of Polymers, 765. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12107.

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Gooch, Jan W. "Trisnonylphenyl Phosphite". In Encyclopedic Dictionary of Polymers, 770. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12160.

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Malowan, J. E., T. P. Traise e T. M. Beck. "Diethyl Phosphite". In Inorganic Syntheses, 58–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132357.ch19.

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Malowan, John E., T. P. Traise e A. D. F. Toy. "Dioctyl Phosphite". In Inorganic Syntheses, 61–62. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132357.ch20.

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Bährle-Rapp, Marina. "Tris(nonylphenyl)phosphite". In Springer Lexikon Kosmetik und Körperpflege, 566. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10774.

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Gooch, Jan W. "Dibasic Lead Phosphite". In Encyclopedic Dictionary of Polymers, 205. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3510.

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Atti di convegni sul tema "Phosphite"

1

Kumar, K. Senthil, S. Moorthy Babu, Binay Kumar e G. Bhagavannarayana. "Properties of ferroelectric glycine phosphite single crystals". In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810520.

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Sinko, Anton S., Ilya A. Ozheredov, Peter M. Solyankin, Alexey V. Kargovsky, Vera L. Manomenova, Elena B. Rudneva, Natalia N. Kozlova et al. "Terahertz dielectric properties of guanylurea hydrogen phosphite crystal". In 2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2021. http://dx.doi.org/10.1109/irmmw-thz50926.2021.9567236.

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Gonçalves, K. S., A. P. Sousa, E. D. Velini, M. L. B. Trindade e V. P. S. Paz. "Application of Potassium Phosphite to Eucalyptus Submitted to Water Stress". In II Inovagri International Meeting. Fortaleza, Ceará, Brasil: INOVAGRI/INCT-EI/INCTSal, 2014. http://dx.doi.org/10.12702/ii.inovagri.2014-a380.

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4

Chang, Sae Jung, e Ruth Blake. "Oxygen Isotope Signature during Phosphite Oxidation by Bacterial Alkaline Phosphatase". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.359.

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Champel, Mary-Luc, Anne-Marie Kermarrec e Nicolas Le Scouarnec. "Phosphite: Guaranteeing out-of-order download in P2P video on demand". In 2009 IEEE Ninth International Conference on Peer-to-Peer Computing (P2P). IEEE, 2009. http://dx.doi.org/10.1109/p2p.2009.5284545.

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6

Idrissi, Siham, Zineb Edfouf, Omar Benabdallah, Abdelfettah Lallaoui e Fouzia Cherkaoui El Moursli. "Tin Phosphite SnHPO3 a New Anode Material for Li-ion Batteries". In 2018 6th International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2018. http://dx.doi.org/10.1109/irsec.2018.8702926.

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Guo, Huang, Gulfam Iqbal e Bruce S. Kang. "PH3 Effects on the Electrochemical Degradation of SOFC Anode". In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54913.

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Solid Oxide Fuel Cell anode is readily degraded by trace amount of Phosphine (PH3) contaminant that is found in coal-derived syngas. PH3 interacts with the anode material and affects its electrochemical performance by forming secondary phases. In this paper, the influence of the ppm level of PH3 with moisture is investigated on the formation of secondary phases and hence on anode electrochemical performance degradation. Nickel yttria-stabilized zirconia (Ni-YSZ) anode shows immediate and severe electrochemical degradation due to PH3 in moist hydrogen condition attributed to the nickel-phosphate secondary phase formation. Whereas in dry hydrogen condition, nickel-phosphide is preferred to form on the anode surface that shows less deleterious effects on SOFC performance as compared to nickel-phosphate.

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Murphy-Jolly, Makeba B., Samuel B. Owens, Gary M. Gray, Christopher M. Lawson e David P. Shelton. "Synthesis, Crystal Structure and Hyper Rayleigh Scattering Measurements of Phosphite-Substituted Schiff Base Ligands". In Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/nlo.2009.jwa19.

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Narita, K., e M. Priest. "Friction Characteristics and Topography of Tribofilms From Anti-Wear Additives Applied to Metal V-Belt Type CVT Fluids". In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44204.

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This study has investigated the metal-meal friction properties and the topography of tribochemical films derived from antiwear additives for application to metal-V-belt pushing type continuously variable transmission fluids (B-CVTFs). The influence of metal-metal tribological properties of various kinds of anti-wear additives were evaluated using a ball on plate tribometer, enabling lubricant film formation to be monitored during a reciprocating sliding test. In addition, contact mode atomic force microscope (AFM) was used to characterize the nature of the tribofilms at the namometre scale. For zinc-dithiophosphate (ZnDTPs), significant differences were observed in the friction coefficients and the topographic images between secondary and aryl type ZnDTP. The films derived from secondary type exhibit large solid pads, 5–30μm in length elongated in the sliding direction while the aryl type forms films in streaks on the ridges, with 8% higher friction coefficient than the secondary ZnDTP. Notably, the combination of over-based calcium sulphonate and hydrogen phosphite demonstrated a synergism with 8% higher friction coefficient and more stable film formation than the individual cases, providing a positive outcome for a BCVTF. Tribofilm species produced by a chemical reaction between hydrogen phosphite and over-based calcium sulphonate were densely deposited on the rubbing tracks, exhibiting rougher surfaces than those observed in the individual cases, consequently with a higher friction coefficient. These results suggest that the friction properties between metal-metal contacting surfaces strongly depend on the morphology of tribofilms derived from lubricant additives.

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Sinko, A., I. Ozheredov, A. Balakin, P. Solyankin, V. Manomenova, E. Rudneva, N. Sorokina, N. Kozlova, A. Voloshin e A. Shkurinov. "Temperature dependence of optical phonons in Guanylurea Hydrogen Phosphite Crystal in the terahertz frequency range". In 2020 International Conference Laser Optics (ICLO). IEEE, 2020. http://dx.doi.org/10.1109/iclo48556.2020.9285507.

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Rapporti di organizzazioni sul tema "Phosphite"

1

Pellenbarg, Robert E., e Kia Cephas. Water Solubility of BIS (2-Ethylhexyl) Hydrogen Phosphite. Fort Belvoir, VA: Defense Technical Information Center, aprile 1991. http://dx.doi.org/10.21236/ada234561.

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2

Deng, Zengqun, John Z. Zhang, Arthur B. Ellis e Stanley H. Langer. Catalytic Oxidation of Triphenyl Phosphite with Ferric Ion-Modified Chromatographic Silica. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1993. http://dx.doi.org/10.21236/ada266712.

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3

Cataldo, D. A., S. D. Harvey, B. D. McVeety, R. J. Fellows e P. Van Noris. Chemistry and preliminary environmental effects of mixtures of triisopropyl phosphite, Bis-(2-ethylexyl)-phosphonate, and sulfur. Final report. Office of Scientific and Technical Information (OSTI), dicembre 1991. http://dx.doi.org/10.2172/10115186.

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4

White, William E. Quantum Chemical Study of the Phosphite-Phosphonate Tautomerization: Applications to bis(2-Ethylhexyl) Phosphonate (BIS) and Other Simulants for Chemical Warfare Agents. Fort Belvoir, VA: Defense Technical Information Center, novembre 2002. http://dx.doi.org/10.21236/ada410497.

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5

Raghothama, Kashchandra G., Avner Silber e Avraham Levy. Biotechnology approaches to enhance phosphorus acquisition of tomato plants. United States Department of Agriculture, gennaio 2006. http://dx.doi.org/10.32747/2006.7586546.bard.

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Abstract: Phosphorus is one of the least available macronutrient in the soil. The high affinity phosphate transporters are known to be associated with phosphate acquisition under natural conditions. Due to unique interactions of phosphate with soil particles, up to 80% of the applied phosphates may be fixed forcing the farmers to apply 4 to 5 times the fertilizers necessary for crop production. Efficient uptake and utilization of this essential nutrient is essential for sustainability and profitability of agriculture. Many predictions point to utilization/exhaustion of high quality phosphate rocks within this century. This calls for efforts to improve the ability of plants to acquire and utilize limiting sources of phosphate in the rhizosphere. Two important molecular and biochemical components associated with phosphate efficiency are phosphate transporters and phosphatases. This research project is aimed at defining molecular determinants of phosphate acquisition and utilization in addition to generating phosphate uptake efficient plants. The main objectives of the project were; Creation and analysis of transgenic tomato plants over-expressing phosphatases and transporters Characterization of the recently identified members (LePT3 and LePT4) of the Pi transporter family Generate molecular tools to study genetic responses of plants to Pi deficiency During the project period we have successfully identified and characterized a novel phosphate transporter associated with mycorrhizal symbiosis. The expression of this transporter increases with mycorrhizal symbiosis. A thorough characterization of mutant tomato lacking the expression of this gene revealed the biological significance of LePT3 and another novel gene LePT4. In addition we have isolated and characterized several phosphate starvation induced genes from tomato using a combination of differential and subtractive mRNA hybridization techniques. One of the genes, LePS2 belongs to the family of phospho-protein phosphatase. The functionality of the recombinant protein was determined using synthetic phosphor-peptides. Over expression of this gene in tomato resulted in significant changes in growth, delay in flowering and senescence. It is anticipated that phospho-protein phosphatase may have regulatory role in phosphate deficiency responses of plants. In addition a novel phosphate starvation induced glycerol 3-phosphate permease gene family was also characterized. Two doctoral research students are continuing the characterization and functional analysis of these genes. Over expression of high affinity phosphate transporters in tobacco showed increased phosphate content under hydroponic conditions. There is growing evidence suggesting that high affinity phosphate transporters are crucial for phosphate acquisition even under phosphate sufficiency conditions. This project has helped train several postdoctoral fellows and graduate students. Further analysis of transgenic plants expressing phosphatases and transporters will not only reveal the biological function of the targeted genes but also result in phosphate uptake and utilization efficient plants.

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Collings, R. K. Phosphate. Natural Resources Canada/CMSS/Information Management, 1991. http://dx.doi.org/10.4095/328633.

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Chandler, F. W., e R. L. Christie. Stratiform phosphate. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/207952.

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Hay, M., e W. King. PHOSPHATE MANAGEMENT: FY2010 RESULTS OF PHOSPHATE PRECIPITATION TESTS. Office of Scientific and Technical Information (OSTI), aprile 2011. http://dx.doi.org/10.2172/1013047.

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Grasby, S. E., e J. M. Galloway. Rare-earth elements of Permian through Cretaceous strata of the Sverdrup Basin, Nunavut and Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330202.

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This report provides new rare earth element (REE) data from Permian through to Late Cretaceous sedimentary rocks of the Sverdrup Basin, along with focused analyses on phosphate nodules that occur in the Middle Triassic Murray Harbour Formation. Results show the overall sedimentary values are low, however phosphate nodules are highly enriched in REEs.

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Lumetta, Gregg J., Jenifer C. Braley, Matthew K. Edwards, Odeta Qafoku, Andrew R. Felmy, Jennifer C. Carter e Paul J. MacFarlan. Removing Phosphate from Hanford High-Phosphate Tank Wastes: FY 2010 Results. Office of Scientific and Technical Information (OSTI), settembre 2010. http://dx.doi.org/10.2172/992014.

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