Composition and Crystallinity of Electroless Nickel
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Materials Literature
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Smectic X : the first truly ferroelectric liquid crystal
We report the identification of the first truly ferroelectric liquid crystal in a compound which also shows chiral C, I and G' phases at higher temperatures. In the new phase the director can be oriented in a bistable way with an electric field V in a time τ such that V.ln τ is proportional to temperature. Furthermore…
Microstructural changes in as-cast M2 grade high speed steel during high temperature treatment
An optical and electron metallographic study has been carried out on chill and sand cast M2 grade high speed steel in the as-cast condition and after reheating to temperatures typical of those for hot working for times up to 200 h. The as-cast material contains M2C, MC, and M6C particles, but the M2C decomposes rapidl…
Continuous serial thin sectioning for electron microscopy
Abstract The process of serial sectioning for electron microscopy has been refined such that loss of thin sections is kept below 0.1% and the series is continued at will. The method relies on microscopic control of all manipulative steps, Formvar casting on plate glass for coated slot grids, coating of the block with…
Radiation-induced Formation of Thymine-thymine Crosslinks
The formation of dimers upon gamma-irradiation of thymine, thymidine and thymidine-5'-monophosphate in N2O-saturated aqueous solution is reported. A method using capillary gas chromatography-mass spectrometry was developed for their separation and identification. Quantitative measurements reveal that about 50 per cent…
Behaviour of poly(pyrrole) and poly(N‐methylpyrrole) electrodes in acetonitrile
Abstract The impedance of poly(pyrrole) (PP) and poly( N ‐methylpyrrole) (PMP) films on platinum in an acetonitrile, LiClO 4 solution has been measured. At potentials more positive than a characteristic value, the electrodes exhibit porous behaviour and the impedance is determined by the double‐layer capacitance and t…
Molecular orientation and anchoring energy at the nematic-isotropic interface of 7CB
The properties of the nematic-isotropic interface of the nematic liquid crystal 7CB are studied by optical reflectometry. It is found that at the interface the director is tilted with respect to the vertical axis. Measurements are reported of the tilt angle θt, of the thickness of the interface, and of the anchoring e…
Effect of oxy radicals on several types of collagen.
Fibrils of collagen reconstituted in vitro by dialysis against sodium formate are exposed to free oxy radicals generated by three different systems: (i) xanthine oxidase + hypoxanthine, (ii) gamma-rays originating from a cobalt bomb; (iii) pulse radiolysis in a particle accelerator. A degradation of the collagen fibre…
Observations on Rhizosolenia clevei Ostenfeld (Bacillariophyceae) and Richelia intracellularis Schmidt (Cyanophyceae)
Article Observations on Rhizosolenia clevei Ostenfeld (Bacillariophyceae) and Richelia intracellularis Schmidt (Cyanophyceae) was published on January 1, 1984 in the journal Botanica Marina (volume 27, issue 8).
Nature of S ⋯· O interaction in short X –S ⋯· O contacts: charge density experimental studies and theoretical interpretation
2-(2-Chlorobenzoylimino)-1,3-thiazolidine (I) and 3-benzoylimino-4-methyl-1,2,4-oxathiazane (II) present short intramolecular S ⋯· O contacts of 2.68 and 2.24 Å, respectively. X-Ray and neutron diffraction at 122 K performed on (II), for comparison with (I), already studied, led to experimental charge density deformat…
pH-Sensitive permeability control of polymer-grafted nylon capsule membranes
Poly(4-vinylpyridine) or poly (methacrylic acid) was grafted onto an ultrathin, porous nylon capsule membrane so that permeation across the capsule membrane of NaCl trapped in the inner aqueous phase could be reversibly controlled by ambient pH changes.
Recent developments in cellulose solvent systems
Comparaison de l'utilisation, des avantages et limites des amines oxydes, ammoniac liquide avec un sel d'ammonium, et LiCl avec le dimethylacetamide comme trois des systemes solvants les plus recemment decrits
Formation of Calcium Hydroxide from Aqueous Suspensions of Tricalcium Silicate
The release of Ca 2+ and OH” from tricalcium silicate into the aqueous phase was monitored over the first few hours. The solution becomes supersaturated with respect to pure calcium hydroxide with the maximum activity product being about 3.5 times greater than the solubility product. Evidence is presented in support o…
Proceedings of the topical conference on ferritic alloys for use in nuclear energy technologies
This book contains the papers given at a conference on the use of ferritic steels as reactor materials in nuclear and thermonuclear power plants. Topics considered at the conference included light water reactors (application and experience), liquid metal cooled fast breeder reactors, fusion reactor systems, non-nuclea…
Synthesis and ferroelectric properties of new series of ferroelectric liquid crystals
Four new series of ferroelectric liquid crystals (p-alkoxybenzylidene-p′-amino-1p″-methylbutylcinnamate, p-alkoxybenzylidene-p′-amino-1p″-methylpropyl-cinnamate, o-hydroxy-p-alkoxybenzylidene-p′-amino-2p″-methylbutylcinnamate and o-hydroxy-p-alkoxybenzylidene-p′-amino-1p″-methylpropylcinnamate) have been synthesized.…
Lyotropic mesophases of hydroxypropylcellulose in pure acetic acid, in water, and in mixed solvents
Abstract Photomicrographys of concentrated lyotropic hydroxypropylcellulose solutions confirm the cholesteric nature of the anisotropic phases in acetic acid and water. They reveal the existence of biphasic separation. Typical liquid‐crystal solvent‐dependent textures are observed. The behavior of liquid‐crystalline p…
Magnetic superconductors
International audience
Production of Thymine Base Damage in Ultrasound-Exposed EMT6 Mouse Mammary Sarcoma Cells
Mouse mammary sarcoma cells, line EMT6/Ro, were exposed for 1 min to 1 MHz continuous wave ultrasound over a range of intensities from 0.5 to 30 W/cm2 (spatial peak). The presence of thymine base damage (TBD) products of the 5,6-dihydroxydihydrothymine type was determined by an alkali degradation assay. Production of…
The superstructure of the double layer mineral wermlandite [Mg7(Al0.57, Fe0.433+) (OH)18]2+· [(Ca0.6, Mg0.4) (SO4)2(H2O)12]2−
The structure of wermlandite, (Mg7(Alo.57Feo.43h(OH)ls)2+ ((CaO.6'Mgo.4) (S04h(H20)u)2- has been determined and refined to an R value of 7.2 % based on 779 symmetry-independent reflections, of which 224 are unobserved (weighted R=6.1%). The cell dimensions are a=b=9.303(3), c=22.57(1) A, the space group is pjc1 with Z…
A correlation between short range smectic-like ordering and the elastic constants of nematic liquid crystals
The measurements of the bend (k33) and splay (k 11) elastic constants and the amplitude of the smectic-like local ordering (obtained using X-ray diffraction techniques), have been made for a wide range of nematogens. The results reveal a strong correlation between k33/k11 and the strength of the smectic-like local ord…