Search results for "Ethylene"

showing 10 items of 2589 documents

CO2-Based Non-ionic Surfactants: Solvent-Free Synthesis of Poly(ethylene glycol)-block-Poly(propylene carbonate) Block Copolymers

2013

Copolymerization of carbon dioxide (CO2) and propylene oxide (PO) is employed to generate amphiphilic polycarbonate block copolymers with a hydrophilic poly(ethylene glycol) (PEG) block and a nonpolar poly(propylene carbonate) (PPC) block. A series of poly(propylene carbonate) (PPC) di- and triblock copolymers, PPC-b-PEG and PPC-b-PEG-b-PPC, respectively, with narrow molecular weight distributions (PDIs in the range of 1.05–1.12) and tailored molecular weights (1500–4500 g mol−1) is synthesized via an alternating CO2/propylene oxide copolymerization, using PEG or mPEG as an initiator. Critical micelle concentrations (CMCs) are determined, ranging from 3 to 30 mg L−1. Non-ionic poly(propylen…

genetic structuresPolymers and PlasticsOrganic Chemistrytechnology industry and agricultureCondensed Matter PhysicsMicellechemistry.chemical_compoundchemistryvisual_artPropylene carbonateAmphiphilePolymer chemistryPEG ratioMaterials Chemistryvisual_art.visual_art_mediumCopolymerPropylene oxidePhysical and Theoretical ChemistryPolycarbonateEthylene glycolMacromolecular Chemistry and Physics
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Polymorphism of Amyloid Fibrils and their Complexes with Catalase

2014

Catalase binding to amyloid fibrils has been shown for the Alzheimer’s amyloid-β (Aβ), type 2 diabetes-associated islet amyloid polypeptide (IAPP) and Creutzfeldt-Jakob disease-associated prion protein (PrP). Catalase targets a specific domain with a GAII-like sequence and there are a number of other amyloid fibril-forming proteins that contain related sequences, such as the Parkinson’s associated α-synuclein protein and the Huntington disease protein Huntingtin. Using transmission electron microscopy (TEM) analysis, interactions show specific binding of catalase to some, but not all, fibrillar forms of Aβ, IAPP and PrP fragments, allowing determination of the fibrillar forms that contain a…

geographyHuntingtingeography.geographical_feature_categorybiologyP3 peptideIsletnervous system diseaseschemistry.chemical_compoundKisspeptinschemistryPolymorphism (materials science)BiochemistryCatalasemental disordersHuntingtin Proteinbiology.proteinEthylene glycol
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Sensory performance of blind Mexican cave fish after destruction of the canal neuromasts.

1990

geographygeography.geographical_feature_categoryFishesSense OrgansSensory systemGeneral MedicineAnatomyBiologyMotor ActivitySensory receptorBlindnessMechanoreceptorLesionMethylene Bluemedicine.anatomical_structureCavemedicineFish <Actinopterygii>Animalsmedicine.symptomEpidermisEcology Evolution Behavior and SystematicsDie Naturwissenschaften
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Kompleksy metali przejściowych z zasadami Lewisa jako prekursory katalizatorów polimeryzacji olefin. Cz. I. Postęp w komputerowym modelowaniu procesu…

2001

A review with 35 references covering molecular modeling in coordination polymerization over homogeneous and heterogeneous Ziegler-Natta catalysts. The study includes supports, cocatalysts, Lewis bases and solvents. Recent progress in elucidating the mechanisrn of elementary polymerization steps is presented against the background of rapidly deveIoping computational methods and available computational power. Theoretical studies on polymerization mcchanisms and structure of active centers are described (egns. 1-4). Authors own calculations are used to compare [MtC14(THF)2] complex-based (Mt = Ti, Hf or Zr) heterogeneous catalysts. The geometrical characteristics of precursors is presented (Ta…

geometrical characteristics of precursorsmolecular modelingactivity of catalystsZiegler-Natta homogeneous and heterogeneous catalystsstructure of active centerspolymerization of ethylene and propylenecharges on transition metal atomsPolimery
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The growth of soil fungi Penicillium in the presence of N-(2-pyridylamino)methylenebisphosphonate as an alternative source of nutrients

2017

Kwas N-(2-pirydyloamino)metylenobisfosfonowy wykazują dużą aktywność herbicydową. W związku z tym należy zbadać jego odziaływanie na mikroorganizmy glebowe. Celem przeprowadzonych badań była ocena zdolności glebowych szczepów Penicillium do wzrostu w obecności kwasu N-(2-pirydyloamino)metylenobisfosfonowego jako alternatywnego źródła fosforu lub azotu lub węgla. Hodowle grzybów prowadzono w pełnym i zmodyfikowanym mineralnym podłożu Czapek, w temperaturze 25°C, przez 1–4 tygodnie. Modyfikacja podłoża polegała na wprowadzeniu 1 mM kwasu N-(2 pirydyloamino)metylenobisfosfonowego jako alternatywnego źródła składników odżywczych. Kontrolę względną stanowił wzrost grzybów w pełnym mineralnym pod…

herbicydyN-(2-pirydylamino)methylenebisphosphonic acidherbicidebiodegradacjaPenicilliumkwas N-(2-pirydyloamino)metylenobisfosfonowybiodegradationFolia Pomeranae Universitatis Technologiae Stetinensis Agricultura Alimentaria Piscaria et Zootechnica
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CCDC 732637: Experimental Crystal Structure Determination

2010

Related Article: E.Colacio, H.Aouryaghal, A.J.Mota, J.Cano, R.Sillanpaa, A.Rodriguez-Dieguez|2009|CrystEngComm|11|2054|doi:10.1039/b906382j

hexakis((mu~2~-Pyrimidine-2-carboxylato)-(NNN'N'-tetramethyl-ethylene-12-diamine))-hexa-cobalt hexaperchlorate tetrahydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 725441: Experimental Crystal Structure Determination

2010

Related Article: E.Colacio, H.Aouryaghal, A.J.Mota, J.Cano, R.Sillanpaa, A.Rodriguez-Dieguez|2009|CrystEngComm|11|2054|doi:10.1039/b906382j

hexakis((mu~2~-Pyrimidine-2-carboxylato)-(NNN'N'-tetramethyl-ethylene-12-diamine))-hexa-nickel hexakis(tetrafluoroborate) tetrahydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 725440: Experimental Crystal Structure Determination

2010

Related Article: E.Colacio, H.Aouryaghal, A.J.Mota, J.Cano, R.Sillanpaa, A.Rodriguez-Dieguez|2009|CrystEngComm|11|2054|doi:10.1039/b906382j

hexakis((mu~2~-Pyrimidine-2-carboxylato)-(NNN'N'-tetramethyl-ethylene-12-diamine))-hexa-nickel hexaperchlorate tetrahydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 903571: Experimental Crystal Structure Determination

2013

Related Article: T.K.Ronson,C.Giri,N.K.Beyeh,A.Minkkinen,F.Topic,J.J.Holstein,K.Rissanen,J.R.Nitschke|2013|Chem.-Eur.J.|19|3374|doi:10.1002/chem.201203751

hexakis(mu~2~-44'-bis((Pyridin-2-ylmethylene)amino)biphenyl-22'-disulfonate)-tetra-nickel bis(hexa-aqua-nickel) tetrachloromethane tetrabromomethane clathrate hydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 2041018: Experimental Crystal Structure Determination

2021

Related Article: Goulielmina Anyfanti, Antonio Bauzá, Lorenzo Gentiluomo, João Rodrigues, Gustavo Portalone, Antonio Frontera, Kari Rissanen, Rakesh Puttreddy|2021|Frontiers in Chemistry|9||doi:10.3389/fchem.2021.623595

hexamethylenetetramine dibromineSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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