A Beginner's Guide To Freshwater Algae
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Electrical resistivity of electron-irradiated concentrated Fe-Cr-Ni alloys during isochronal annealing
The resistivity of various Fe-Ni-Cr alloys, electron-irradiated at 4·2 K, has been investigated during annealing from 4·2 to 1300 K. The annealing behaviour for these alloys is completely different from that of pure metals, except in the temperature range below 100 K. A large resistivity increase and decrease was obse…
Photochemistry of Metal-Isocyanide Complexes and Its Possible Relevance to Solar Energy Conversion
Formation of M(CNPh) 5 py and M(CNIph) 5 py occurs upon 436-nm irradiation of M(CNPh) 6 and M(CNIph) 6 (M = Cr, Mo, W; Iph = 2,6-diisopropylphenyl) in pyridine, with quantum yields descreasing according to [Cr(CNPh) 6 ] (0.23) ~ [Cr(CNIph) 6 ] (0.23) > [Mo(CNPh) 6 ] (0.055) > [Mo(CNIph) 6 ] (0.022) > [W(CNPh) 6 ] (0.0…
Cofactor Role of Iodide in Peroxidase Antimicrobial Action Against Escherichia coli
The mechanism of antimicrobial activity of the peroxidase-hydrogen peroxide (H(2)O(2))-iodide (I(-)) system was investigated. Inhibition of respiration and loss of viability of Escherichia coli were used as measures of antimicrobial activity. Because the bacteria destroyed H(2)O(2), peroxidase antimicrobial action dep…
An electron paramagnetic resonance study of free-radical additions to trithiocarbonates and of the formation and destruction of tetrathiafulvalene by free-radical processes
Tris(organothiyl)methyl radicals, RnMSC(SR )2, have been generated by the addition of a variety of transient RnM-radicals to the thione sulfur of three trithiocarbonates (dimethyl trithiocarbonate (2), 1,3-dithiolane-2-thione (3), and 1,3-dithiole-2-thione (4)) and their EPR parameters have been measured. All adducts…
Luminescence Properties and the Primary Process of Photochromism of 2-(2-Hydroxyphenyl)benzothiazole
Abstract The luminescence behavior of 2-(2-hydroxyphenyl)benzothiazole at 77 K was studied in detail, special attention being paid to dual fluorescence at ≈500 and ≈370 nm and also to phosphorescence at ≈500 nm. From the dependence of these emission bands upon the hydrogen-bonding ability of solvents and the excitatio…
Reactions of salts with kaolinite at elevated temperatures. I
Abstract On heating at temperatures below 600°C kaolinite reacts with salts of alkali metals according to the equation 2SiO 2 · Al 2 O 3 · 2H 2 O + 2 n MX → 2SiO 2 · Al 2 O 3 · n M 2 O + 2 n HX + (2− n )H 2 O The reaction commences with the dehydroxylation of the clay and is favoured by high solubility of the salt and…
AB2X2-Verbindungen im CaAl2Si2-Typ, V[1] Zur Struktur der Verbindungen CaMn2P2, CaMn2As2, SrMn2P2 und SrMn2As2 / AB2X2-Compounds with the CaAl2Si2 Structure, V [1] The Crystal Structure of CaMn2P2, CaMn2As2, SrMn2P2, and SrMn2As2
Abstract Four ternary compounds with the formulas CaMn 2 P 2 , CaMn 2 As 2 , SrMn 2 P 2 , and SrMn 2 As 2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in a CaAl 2 Si 2 -type structure (space group P3̅m 1-D 3 3 d) with the lattice constants: CaMn 2 P 2 a = 4,096 ± 0…
Magnetic properties of linear chain systems: Metamagnetism of single crystal Co(pyridine)2Cl2
The metamagnetic behavior of the low temperature properties of single crystal Co(pyridine)2Cl2 is discussed. At 1.25 K oriented single crystals exhibit a two-step metamagnetic transition at applied fields ∼0.8 and 1.6 kG along the b-axis, a single transition at ∼0.7 kG for applied fields along the a* axis, and a singl…
Chemical and structural relationships among the oligomeric compounds MFe(CO)4 (M = zinc, cadmium, mercury), iron lead tetracarbonyl, cobalt silver tetracarbonyl, and their Lewis base adducts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and structural relationships among the oligomeric compounds MFe(CO)4 (M = zinc, cadmium, mercury), iron lead tetracarbonyl, cobalt silver tetracarbonyl, and their Lewis base adductsRichard D. Ernst and Tobin J. MarksCite this: Inorg. Chem. 1978, 17, 6, 1477–1484Publ…
Crystal structures of the simple monoclinic and orthorhombic polytypes of tripotassium hexacyanoferrate(III)
The room-temperature (295 K) crystal structures of potassium ferricyanide, K3[Fe(CN)6], have been determined for the simplest monoclinic (a reinvestigation) and orthorhombic polytypes by single- crystal X-ray diffraction. The monoclinic form is P21/c, a 7.047(3), b 10.400(3), c 8.384(3) ?, ß 107.29(3)°, Z 2. The iron…
Effect of para substituent on rates of phenyl ring rotation in gallium complexes of para-substituted tetraphenylporphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of para substituent on rates of phenyl ring rotation in gallium complexes of para-substituted tetraphenylporphyrinsS. S. Eaton, D. M. Fishwild, and G. R. EatonCite this: Inorg. Chem. 1978, 17, 6, 1542–1545Publication Date (Print):June 1, 1978Publication History Publis…
Darstellung und Kristallstruktur von Rb2Sb4S7
Abstract Als erstes Rubidiumthioantimonit wurde aus wäßriger Sulfidlösung Rb 2 Sb 4 S 7 dargestellt und seine Kristallstruktur aufgeklärt. Die Substanz kristallisiert triklin in der Raumgruppe P 1 mit den Gitterkonstanten a = 968,0(5) pm, b = 1193,4(5) pm, c = 723,1(5) pm, α = 87,68(5)°, β = 101,39(5)° und γ = 102,66(…
Mechanism of dissolution-controlled cracking
The main electrochemical requirement for a dissolution-controlled cracking mechanism is considered to be a critical delay in the repassivation time during which a certain coulombic charge flows. The strain rate at the crack tip and the repassivation rate are in a permanent critical state of imbalance. After considerat…
Darstellung und Kristallstruktur von Cs2Sb4S7
Abstract Als erstes Cäsiumthioantimonit wurde die Verbindung Cs 2 Sb 4 S 7 aus wäßriger Sulfidlösung dargestellt und ihre Kristallstruktur aufgeklärt. Sie kristallisiert monoklin in der Raumgruppe P2 1 / c mit den Gitterkonstanten: a = 1111,2(5) pm. b = 1227,1(5) pm, c = 1163,7(5) pm, ß = 97,60(5)°. Die Elementarzelle…
Comparisons of high frequency magnetic core losses under two different driving conditions: A sinusoidal voltage and a square-wave voltage
It is observed that for the same peak flux density and the same operating frequency, the core loss induced by a square-wave voltage drive is less than the loss induced by a sinusoidal voltage drive, which is contrary to what one would normally anticipate. To the best of the author's knowledge, there Is no theory that…
A proposed mechanism for the degradation of addition polymers in cavitating ultrasonic fields
Abstract A mechanism for the degradation of polymer molecules in ultrasonic cavitation has been proposed which takes into account the energy released by imploding cavitation bubbles in the form of hydrodynamic waves. Relationships for degradation rate constant and limiting chain length linking with the cavitation ener…
Stability of magnetic levitation
The levitation forces on metal spheres in magnetic fields of axial symmetry are derived theoretically. Criteria for stability of the center of mass are obtained. It is shown for nonmagnetic samples that the desirable coil configurations are those which provide a constant field gradient along the symmetry axis. The for…
Über die Farbe von „NiO" / The Different Colours of „NiO”
Abstract Depending on the method of preparation ,,NiO”-single crystals of different colours can be synthesized. It is shown by ligand field spectroscopy that the ligand field and interelectronic repulsion parameters are the same for the green, yellow and brown crystals. There is definite spectroscopic evidence, that t…
The influence of sodium chloride on the atmospheric corrosion of steel
Abstract The influence of sodium chloride on the atmospheric corrosion of mild steel has been studied. Samples covered with sodium chloride crystals (8 m̈g NaCl · cm −2 ) have been exposed to an SO 2 ‐free atmosphere at different relative humidities. The combined effect of sodium chloride crystals on a steel surface a…