Synthesis of meso-ionic anhydro-2-arylamino-1,3,4-oxadiazolium hydroxides
The synthesis and characterisation of anhydro-2-arylamino-1,3,4-oxadiazolium hydroxides (II), a new class of meso-ionic compounds, is described.
Materials Literature
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Contribution à l'étude du système quaternaire KClRbClCsClH2O: II. L'isotherme de 25°C
Abstract The experimental study at 25°C of the system KClRbClCsClH 2 O has shown the existence of a new type of quaternary system with formation of mixed crystals. — The solubility diagram is characterized by the presence of one univariant line and one binary miscibility gap. Two types of solid solutions are presen…
La hakite, un nouveau minéral du groupe de la tétraédrite
Cubique, isotype de la tétraédrite, a = 10,88 ± 0,01 Å ; Z = 8, dx = 6,3. Les raies les plus intenses du diagramme de poudre sont : 3,140(10) ; 2,910 (7) ; 1,985 (7) ; 1,925 (9) ; 1,639 (8) Å. Les analyses chimiques (microsonde électronique) donnent : Cu 26,6 (26,6) ; Hg 15,3 (14,3) ; Sb 15,5 (19,1) ; As 3,2 (0,7) ; S…
High Pressure Phase Diagram of Al-Si System
A phase diagram of Al-Si system in the hypoeutectic region at 28kb has been composed. A girdle-type high pressure device was used to press and heat the specimens, and an electric resistance method to detect the phase transitions. The characteristic figures obtained are as follows;(1) The melting point of pure Al has b…
Phase Equilibria and Eu2+-, Tb3+-, and Mn2+-Activated Luminescent Phases in the CaO-MgO-P[sub 2]O[sub 5] System
The ternary subsolidus phase equilibria has been determined for that portion of the system containing less than 50 m/o (mole per cent) . Limits of solid solution along the orthophosphate join were determined for , , and . The 3:3:2 compound had a rapid, reversible inversion at 1104°C and melted incongruently at . melt…
STUDIES ON THE ANTI-OVULATORY AND OVULATORY ACTION OF CLOMIPHENE CITRATE IN THE RAT
Summary. To study the site and mechanism of its ovulation-inhibiting effect, clomiphene citrate was implanted bilaterally into the hypothalamus and hypophysis of adult di-oestrous rats and of prepuberal females which were also treated with oestradiol benzoate. The results suggest that this effect is primarily due to t…
Hexanitrolanthanates(III)
Unit-cell parameters have been measured for some alkali-metal hexanitrolanthanates. The electronic spectra of these complexes closely resemble that of NaNO2, as expected for very weak lanthanide–nitrite bonding, although the lowest triplet absorption is much more intense than in NaNO2. Ce(NO2)63– shows metal–ligand el…
Scanning Electron Microscopic Study of Cholesterol Gallstones
The latest techniques in scanning electron microscopy have been applied to this study. In cholesterol gallstones, the fracture surface generally shows a crystalline plane radiating pattern, often showing dendritic growth, around the nucleus. On the surface or fracture plane of a cholesterol stone, parallelogram crysta…
Atomic and molecular beam scattering from macroscopically rough surfaces
The scattering of thermal energy atomic and molecular beams from macroscopically rough surfaces has been found to display scattered flux distributions that are typically skewed towards the incoming, beam i.e., backscattered. Such an observation is consistent with the results reported in the literature describing flow-…
Interdiffusion in Cobalt-Nickel Alloys
Interdiffusion in Co-Ni alloys was studied in the temperature range between 880° and 1300°C, using diffusion couples of pure cobalt and nickel. Matano’s method was employed to determine the interdiffusion coefficient, \ ildeD, as a function of concentration.It was found that above 1190°C, \ ildeD behaved as in an idea…
Étude par Diffraction‐X de Quelques Composés du Système Nicote Obtenus par Synthèse Thermique
Abstract We have studied the compounds with metal/tellurium ratio less or equal to unity in the ternary system NiCoTe. The limits of the homogeneity range of the hexagonal (Ni, Co) 1–x Te phase have been fixed for different Ni/Co ratios. The compounds formed in the series (Ni λ Co 1–x ) 0,75 Te and (Ni x Co 1–x ) 0,…
Über die elektronenmikroskopische Abbildung von Amylosefibrillen und Sternmolekülen aus Glykogen als Jodkomplex
Abstract Electron Microscopic Studies of Amylose Fibrils and Star‐Shaped Molecules Derived from Glycogen in the Form of the Iodine Complex. The amylose‐iodine complex crystallizes in the form of fibrils with uniform diameters of 40 Å. From very diluted solutions single rodlike molecules of the same diameter are obtain…
The planar Hall effect in thin foils of Ni-Fe alloy
The planar Hall effect in ferromagnetic Ni-Fe alloys (Ni content at 100%, 80% and 50%) is observed. At room temperature it is found that in addition to the quadratic dependence on magnetization there also exists a parabolic dependence on the applied field for a field above the magnetic saturation. This is explained by…
Phase Equilibria and Tin-Activated Luminescence in the System Ca[sub 3](PO[sub 4])[sub 2]-Ba[sub 3](PO[sub 4])[sub 2]
The phase diagram for the system has been determined in detail. Although no intermediate compounds were found in the system, two extensive solid solution regions having the and structures were found to exist. is a newly discovered polymorph stable above 1390°C. The divalent tin‐activated luminescence of various phases…
Effects of ammonium phosphate and sulfate on the pyrolysis and combustion of cellulose /
Differential thermal, thermogravimetric, and derivative thermogravimetric analyses were used to study the effects of two important fire retardant chemicals ammonium phosphate and ammonium sulfate -on the pyrolysis and combustion of cellulose. To aid in the interpretation of treated cellulose thermograms, the thermal b…
Mechanism of Precipitation Hardening of Magnesium-Zinc Alloys
The strength at room temperature of Mg-4 wt% Zn polycrystalline alloys (grain size: about 50 μ) in various aging states has been studied by the tensile test and electron-microscope observations. It is found that this alloy is age-hardened by the following mechanism.(1) The yield strength in the early stage of aging (p…
Mesomorphic Behaviour of Cholesteryl Esters: II: Trans-p-n-Alkoxy Cinnamates of Cholesterol
A homologous series of cholesteryl (trans-p-n-alkoxy) einnamates has been prepard by reacting trans-p-n-alkoxy cinnamoyl chlorides with cholesterol, and its mesomorphic behaviour studied. All the members of the series are enantiotropic mesomorphic. The lower members of the series exhibit cholesteric mesophases, wherea…
The infrared spectrum of matrix isolated BaO2
Th e in fra red spec tra of matri x iso la ted BaO, have bee n o bse rv ed and ass igne d. Ba ato ms were a ll owe d to react with a n a rgo n oxyge n mixture a nd co nd e nsed o n a li qu id hydroge n cuo led s urface .
Red- and Near-infrared-luminescent benzazole derivatives
Bis-2,5-(2-benzazolyl)hydroquinones, a new class of luminescent benzazoles, possess unusally long wavelength luminescence between 630 and 730 nm.
Constituents of Chinese Crude Drug"Wujiapi."III. On the Structure of Glycoside G and K of Bei-Wujiapi
The chemical structure of glycoside G (I), C36H56O13, mp 232-233°, [α]19D+30.2°(EtOH) and glycoside K (V), C40H66O16, mp 240-241°, [α]20D -27.58°(MeOH) were isolated from Bei-Wujiapi (cortex of Periploca sepium BGE.) and established to be periplocin and Δ5-pregnene-3β, 20α-diol(20)-β-D-glucopyranosyl (1glu→6glu)-β-D-g…