Search results for "Lene"
showing 10 items of 4480 documents
Volatile Constituents ofTeucrium poliumL. from Turkey
1998
Abstract The volatile constituents obtained from the aerial parts of Teucrium polium were analyzed by GC and GC/MS. The oil was found to contain 37 components, of which 30 were identified. The major constituents were β-pinene (18.0%), β-caryophyllene (17.8%), α-pinene (12.0%), caryophyllene oxide (10.0%), myrcene (6.8%) and germacrene-D (5.3%)
Donor-Stabilized Phosphenium Adducts as New Efficient and Immobilizing Ligands in Palladium-Catalyzed Alkynylation and Platinum-Catalyzed Hydrogenati…
2009
The straightforward synthesis of a new donor-stabilized phosphenium ligand 3d by addition of bromodifurylphosphine to 1,3-dimethylimidazolium-2-carboxylate 1 is described. The obtained ligand exhibits a very strong π-acceptor character, comparable to that of triphenyl phosphite [P(OPh) 3 ] or of tris-halogenophosphines, with a v CO (A 1 ) at 2087 cm ―1 for its nickel tricarbonyl complex. This ligand, as well as the related 3a which was obtained from chlorodiphenylphosphine, were tested in palladium-catalyzed aryl alkynylation and in the platinum-catalyzed selective hydrogenation of chloronitrobenzenes, both in an ionic liquid phase. In C―C bond cross-coupling we observed that the increase o…
Differential antiepileptic effects of the organic calcium antagonists verapamil and flunarizine in neurons of organotypic neocortical explants from n…
1988
Effects of the organic calcium antagonists verapamil and flunarizine on pentylenetetrazol induced paroxysmal depolarizations were tested in organotypic neocortical explants taken from neonatal rats. In these in vitro experiments the papaverin derivative verapamil depressed, and finally abolished, epileptic discharges in all cases. The piperazine derivative flunarizine, however, which is known to suppress epileptic discharges in hippocampal CA3 neurons (Bingmann and Speckmann 1986), showed no significant antiepileptic effects in the explanted neocortical neurons. Thus, the present findings may indicate that the suppressive action of flunarizine on the generation of paroxysmal depolarizations…
Influence of Acidic Support in Metallocene Catalysts for Ethylene Polymerization
2001
Abstract We studied a ZSM-5 zeolite as metallocene support for ethylene polymerization. We transformed the Na-ZSM-5 into H-ZSM-5. After the cation exchange, the zeolite was calcined at three different temperatures. Characterization of the material indicated that by means of the calcination procedure it is possible to produce dealuminization with an increase in extraframework aluminum (EFAL). We prepared zirconocene-supported catalysts on zeolitic supports using two preparation methods. The higher activity was observed with the zirconocene supported on ZSM-5 pretreated at 900°C. We think that the dealuminization process generates an increase in EFAL. This EFAL is responsible for the higher a…
CCDC 912877: Experimental Crystal Structure Determination
2013
Related Article: Mikhail A. Kinzhalov, Konstantin V. Luzyanin, Vadim P. Boyarskiy, Matti Haukka, and Vadim Yu. Kukushkin|2013|Organometallics|32|5212|doi:10.1021/om4007592
Dependence of the distortion of the square pyramids in N,N-dimethylethylenediammonium pentachloroantimonate(III) on the geometry of hydrogen bonds
2001
Abstract N ,N-Dimethylethylenediammonium pentachloroantimonate(III) crystallizes in the monoclinic system, in space group P21/c (a = 12.460(2), b = 10.252(2), c = 10.330(2) Å, β = 97.75(3)°, V = 1307.5(4) Å3, Z = 4, dc = 1.997, dm = 1.99(2) g/cm3). The crystal structure of [(CH3)2NH(CH2)2NH3][SbCl5] consists of isolated [SbCl5]2- anions and [(CH3)2NH(CH2)2NH3]2+ cations. The [SbCl5]2- anion has a distorted square pyramidal geometry, presenting one short axial and four long equatorial Sb-Cl bonds. The square pyramids are characteristically stacked one close to the other, parallel to the c axis. The voids between the anionic sublattice are filled by [(CH3)2NH(CH2)2NH3]2+ cations. The five non…
Funkcjonalizowane woski polietylenowe jako kompatybilizatory kompozytów polietylenowo-drzewnych o wysokim stopniu napełnienia
2012
Badano proces otrzymywania kompozytów polimerowo-drzewnych o dużym stopniu napełnienia (60-80%), przygotowanych na bazie polietylenu małej gęstości (PE-LD) z udziałem komercyjnej mączki drzewnej (Lignocel C 120 i Arbocel C 320) oraz dodatkiem wosków polietylenowych sfunkcjonalizowanych poprzez ich utlenienie lub szczepienie bezwodnika maleinowego, stosowanych jako czynniki kompatybilizujące. Otrzymane materiały poddano charakterystyce określając ich podstawowe właściwości mechaniczne oraz chłonność wody. Stwierdzono, że nawet niewielka ilość wprowadzonego kompatybilizatora (2,5%), w porównaniu z próbkami otrzymanymi bez jego udziału, w istotny sposób poprawia wytrzymałość kompozytów na zerw…
LE CISTI EPIDERMOIDI DELLA MILZA
1993
Le cisti epidermoidi della ilza sono rare e rappresentano appena il 10% della patologia cistica non parassitaria. Viene presentato un caso occorso in una piccola paziente di 6 anni, sottoposta a splenectomia per le enormi dimensioni della cisti e per la sua posizione anomale sull'ilo.
Morphology and properties of compatibilized PP/PET melt spun fibers
2017
This work provides a study on the influence of a rubbery compatibilizer on the morphology and on the physical properties of polypropylene (PP)/polyethylenetherephthalate(PET) melt spun fibers at different hot draw ratios. In particular, a sample of SEBS copolymer grafted with maleic anhydride was used as compatibilizer. Both the uncompatibilized PP/PET blend and the compatibilized one were prepared by melt compounding in a counter-rotating twin-screw extruder. The materials have been characterized from a rheological, morphological and mechanical point of view. The addition of the compatibilizer increased the viscosity in shear flow of the uncompatibilized blend, and significantly improved t…