Freshwater and Littoral Diatoms from Cuba
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Materials Literature
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Scale Deposition in Surface and Subsurface Production Equipment in the Gulf of Suez
Abstract Generally the deposition of oilfield scale in surface and subsurface production equipment can cause many operational problems. Scale precipitation in oilfields has a detrimental effect on fluids, processing equipment, pipelines, and downhole well equipment processing equipment, pipelines, and downhole well eq…
Thermally activated magnesium oxide surface chemistry. Adsorption and decomposition of phosphorus compounds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally activated magnesium oxide surface chemistry. Adsorption and decomposition of phosphorus compoundsShaw Tao Lin and Kenneth J. KlabundeCite this: Langmuir 1985, 1, 5, 600–605Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Publi…
The structure of MDI/BDO‐based polyurethanes: Diffraction studies on model compounds and oriented thin films
Abstract Polyurethanes based on MDI/BDO are known to crystallize in three distinct forms. Two of these crystal structures, type II and type III, have been characterized by electron and x‐ray diffraction experiments on model compounds and oriented thin films of a 77% hard‐segment polyurethane elastomer. The model compo…
Nickel-bearing clay minerals: I. Optical spectroscopic study of nickel crystal chemistry
Abstract Nickel crystal chemistry was systematically studied in various phyllosilicates, mainly the natural phases selected from the ‘garnierites’ of the supergene ore deposits of New Caledonia. Minerals which do not usually occur in New Caledonian parageneses were synthesised, as they could represent intermediate pha…
ESR study of two phases of di[bis(ethylenedithio)tetrathiafulvalene]triiodide [(BEDT-TTF)2I3]
The sulfur-based organic metal di[bis(ethylenedithio)tetrathiafulvalene]triiodide [or (BEDT-TTF${)}_{2}$${\mathrm{I}}_{3}$, abbreviated (ET${)}_{2}$${\mathrm{I}}_{3}$] occurs in at least two crystalline phases. One phase (denoted as \ensuremath{\beta}) exhibits ambient-pressure superconductivity, while the second (den…
The hemodynamic destruction of intravascular cancer cells in relation to myocardial metastasis.
A variety of observations in humans and experimental animals indicate that large numbers of circulating cancer cells are killed in the microvasculature. It is suggested that this occurs when friction or adhesion between individual cancer cells and capillary walls results in an increase of tension in the cancer cell pe…
On numerical implementation of hysteresis models
The paper gives a brief description of the Preisach-Krasnoselskii model [1,2] for scalar hysteresis and a geometric interpretation of the model. Previously, it was assumed that numerical implementation of the Preisach model required the evaluation of double integrals. The intent of this paper is to develop a new metho…
Enhanced transcription of fibroin gene in vitro on covalently closed circular templates.
A modified method for S1 nuclease assay has been developed to quantitate an amount of radioactive transcripts in the presence of unlabeled homologous RNA. Using this method, we have assayed in vitro transcription of fibroin gene on circular and linear templates. In a posterior silk gland cell extract, covalently close…
Synthesis, spectroscopy, and structures of copper(II)-3,5-di-tert-butyl-o-semiquinone complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spectroscopy, and structures of copper(II)-3,5-di-tert-butyl-o-semiquinone complexesJeffery S. Thompson and Joseph C. CalabreseCite this: Inorg. Chem. 1985, 24, 20, 3167–3171Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Pu…
Glauconitic sediments on the continental shelf off Vancouver Island, British Columbia, Canada
Abstract The tectonically active Vancouver Island continental margin is characterized by a very narrow (< 80 km) continental shelf and an extremely steep continental slope. The shelf is marked by high wave and current energies on the inner, nondepositional shelf and very slow rates of sediment accumulation on t…
Heat Exchange and Thermal Insulation Compared in Woolen and Nylon Garments During Wear Trials
Heat exchange and thermal insulation were determined in four subjects during 120 minutes exposure (60 minutes exercise and 60 minutes rest) at +8°C in a climatic chamber. Two types of garment assemblies were investigated, each comprising a jacket, trousers, socks, mittens, and a hat of identical construction made of w…
The relationship between the structural type of anionic group and SHG effect in boron-oxygen compounds
The relationship between the structural type of anionic group and SHG effect in oxide compounds has been reviewed.
Crystallographic study of the low-spin iron(II) and iron(III) bis complexes of 1,4,7-triazacyclononane
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic study of the low-spin iron(II) and iron(III) bis complexes of 1,4,7-triazacyclononaneJan C. A. Boeyens, Alister Forbes, Robert D. Hancock, and Karl WieghardtCite this: Inorg. Chem. 1985, 24, 19, 2926–2931Publication Date (Print):September 1, 1985Publication…
Elastic moduli of ultradrawn polyethylene
Abstract The five independent elastic moduli C 11 , C 12 , C 13 , C 33 , and C 44 of oriented high‐density polyethylene with draw ratio λ from 1 to 27 have been determined from −60 to 100°C by an ultrasonic method at 10 MHz. At low temperature the sharp rise in the axial extensional modulus C 33 with increasing λ and…
Preparation and characterization of poly[oxy(2,6‐dimethyl‐1,4‐phenylene)] with functional end groups
Abstract The oxidative polymerization of 2,6‐dimethylphenol ( 1 ) and the halogen displacement polymerization of 4‐halo‐2,6‐dimethylphenols ( 4 ) yielded poly[oxy(2,6‐dimethyl‐1,4‐phenylene)] ( 2 ) with one phenolic end group. 2,2′,6,6′‐Tetramethyl‐4,4′‐isopropylidenediphenol ( 9a ) was used as comonomer in both polym…
Perhalogenierte 1,2,3,5‐Dithiadiazolium‐Salze und 1,2,3,5‐Dithiadiazole
Abstract Synthesen der perhalogenierten 1,2,3,5‐Dithiadiazolium‐Salze FCN 2 S 2 + Cl − ( 5 ) (durch Metathese aus ClCN 2 S 2 + Cl − mit AgF 2 ), FCN 2 S 2 + AsF 6 − ( 5a ) (aus 5 und AgAsF 6 ), CF 3 CN 2 S 2 + Cl − ( 11 ) (aus CF 3 CN und S 3 N 3 Cl 3 in fl. SO 2 (bei dieser Reaktion werden als Nebenprodukte u.a. S 5…
Nonlinear Broensted-type plot in the pyridinolysis of 2,4-dinitrophenyl benzoate in aqueous ethanol
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear Broensted-type plot in the pyridinolysis of 2,4-dinitrophenyl benzoate in aqueous ethanolEnrique A. Castro and Carlos L. SantanderCite this: J. Org. Chem. 1985, 50, 19, 3595–3600Publication Date (Print):September 1, 1985Publication History Published online1 May 200…
Analytical microscope studies of sintered Nd-Fe-B magnets
Various sintered Nd15Fe77B8permanent magnets supplied by different producers have been examined by analytical electron microscopy. An identical microstructure was found in all of the different magnets. Three phases were detected by means of high resolution electron microscopy, electron diffraction and x-ray microanaly…
Low‐temperature glass transition in proteins
Abstract The viscoelastic properties of solid samples (crystals, amorphous films) of hen egg white lysozyme, bovine serum albumin, and sperm whale myoglobin were studied in the temperature range of 100–300 K at different hydration levels. Decreasing the temperature was shown to cause a steplike increase in the Young's…