Calorimetric studies of the growth of Desulfovibrio desulfuricans in the presence of nitrocellulose

Calorimetric results indicate that nitrocellulose (NC)-induced changes in the metabolism of Desulfovibrio desulfuricans 1388 are caused by both chemical (nitrate) and physical (biofilm formation) factors. Nitrate added to lactate-based culture medium with nitrocellulose competed for the electron flux from lactate and suppressed the bacterial sulfidogenesis and growth. The presence of an insoluble compound (carbon backbone of the polymer) induced the creation of a biofilm-like structure with its own metabolism.     

Magnetic phases of FexV1−x S and their electronic structure

A study has been made of the Fe_xV_1−x S solid solutions with 0<x<0.5. For the compounds with x>0.1, x-ray diffraction analysis discloses a V₅S₈ superstructure. Samples with x>0.1 are magnetically ordered at room temperature. The concentration dependences of resistivity and magnetization exhibit sharp peaks for x=0.1 and x=0.2, respectively. The main features of the structure and electronic properties have been qualitatively explained in terms of the three-band exciton-insulator model, and the maxima in resistivity and magnetization are assigned to the formation of localized magnetic moments with S=1, which become delocalized with increasing x. Fiz. Tverd. Tela (St. Petersburg) 40, 1890–1893 (October 1998)     

Halogen-substituted 2-(2′-arenesulfonylaminophenyl)-4h-1,3-benzoxaz-4-ones

Chloro- and bromo-substituted 2-(2-tosylaminophenyl)-4H-1,3-benzoxaz-4-ones and 2-(2-tosylaminophenyl)-4H-naphtho[2,3-d]-1,3-oxaz-4-ones, their absorption spectra at room temperature, and their luminescence spectra at 77 deg K are described.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1597–1601, December, 1970.     

Indolizines

2-Methyl(aryl)-8-carbethoxyindolizines were synthesized, and their reactivities with respect to several nucleophilic and electrophilic reagents were studied. The structures of derivatives of 8-carbethoxyindolizines and the protonation centers were determined by PMR spectroscopy. The ionization constants were measured by potentiometric titration.See [1] for communication IV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 802–808, June, 1978.     

Formylation and vinylformylation of 2,3-cycloalkenobenzopyrylium salts

Heating of 2,3-cycloalkenobenzopyrylium salts in acetic anhydride with excess formylating agent (dimethylformamide, formanilide, N-formylmorpholine, and N-phenyl-N-methyl-aminoacrolein) gives monoiminium salts, the hydrolysis of which yields aldehydes or, in the presence of hydrosulfide, thioaldehydes. On treatment with the Vilsmeier complex, 1-methylquinaldinium salts give diiminium salts, which are hydrolyzed to the corresponding aldehydes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 733–736, June, 1971.     

Coordination of gold(III) in the chemisorption by cadmium diisobutyldithiocarbamate: Structure and thermal properties of the polynuclear gold-cadmium complex [Au“S2CN(iso-C4H9)2”2]2n[CdCl4]n

Gold(III) is coordinated by binuclear cadmium diisobutyldithiocarbamate (Dtc) via chemisorption to give a heteropolynuclear Au(III)-Cd complex of the formula [Au“S₂CN(iso-C₄H₉)₂”₂]_2n [CdCl₄] _n (I). According to X-ray diffraction data, structure I contains three structurally nonequivalent complex cations [Au“S₂CN(iso-C₄H₉)₂”₂]⁺. These cations are conformers. Relatively weak nonvalence interactions produce zigzag polymer chains of the type (...C...A...B...A...) _n with alternating nonequivalent cations A, B, and C in a ratio of 2: 1: 1. The anions [CdCl₄]²⁻ are localized at the side. The calculated theoretical chemisorption capacity of cadmium Dtc with respect to [AuCl₄]⁻ is 378.0 mg of Au³⁺ per gram of the sorbent. To optimize the conditions for isolation of sorbed gold, the thermal properties of complex I were studied by simultaneous thermal analysis. The two-step thermolysis of complex I involves (1) thermal decomposition of the dithiocarbamate part and [CdCl₄]²⁻ with liberation of metallic gold and cadmium dichloride and (2) evaporation of CdCl₂. The final thermolysis product of complex I is reduced metallic gold.