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At least 523 records · Page 29Linked to original sources
PubMed1988

Electron microscopy of tubuloreticular structures in allergic patch test. Observations with 2,3-epoxypropyl trimethyl ammonium chloride.

Tubuloreticular structures (TRS) are intracellular tubular inclusions that can be detected by means of electron microscopy. TRS have earlier been found in autoimmune, viral and neoplastic diseases. Here the occurrence of TRS is for the first time described in allergic patch tests, where they were detected in dermal macrophages. TRS are believed to be reaction products of metabolically active cells, and the TRS described here are probably formed as a result of the activation of the immune system in allergic patch tests.

Dermatitis, Contact↗
PubMed1993

Synthesis and local anesthetic activity of some derivatives of N,N-diethyl-2-(2-alkoxyphenylcarbamoyloxy)bornan-3-ylmethyl-ammonium chlorides.

A series of 8 new esters of 2-alkoxyphenyl-carbamoic acid were synthesized and assayed for local anesthetic activity. All compounds were isolated as hydrochlorides and their structure was proved by 1H-NMR 13C-NMR and IR spectroscopy. The index of anesthetic activity in infiltration and surface anesthesia proved that all prepared compounds are significantly more active than the standard reference compounds, procaine and cocaine, respectively; it is tightly correlated with the length of the alkoxy group. It was found that there is a parabolic relationship between log activity and molecular lipophilicity (as measured by RM). Toxicity of all compounds is within acceptable limits.

Anesthetics, Local↗
PubMedDate not supplied

Formation of a bioconjugate composed of hemin, smectite, and quaternary ammonium chloride that is soluble and active in hydrophobic media.

Hemin (Fe(3+)) was adsorbed onto synthetic smectite (clay mineral) intercalated with a quaternary alkenylammonium compound, dioleyldimethylammonium chloride (DOA), to form a hemin-smectite-DOA conjugate. The hemin-smectite-DOA conjugate was soluble in organic solvents such as benzene and toluene to form a transparent colloidal solution with a light yellow color. Its absorption spectrum in benzene showed two bands, 600 and 568 nm, in the visible region and a sharp Soret band at 400 nm with the molar extinction coefficient of 7.5 x 10(4) M(-1) cm(-1). The formation of the conjugate of smectite and DOA was confirmed by X-ray diffraction analysis: the basal spacing, d(001), of hemin-smectite-DOA conjugate was 19 A which is an expansion of the interlayer space by 5 A based upon the basal spacing of smectite of 14 A. Hemin-smectite-DOA conjugate catalyzed the peroxidase-like reaction in organic solvents using benzoyl peroxide as the hydrogen acceptor and leucocrystal violet as the hydrogen donor. The temperature-dependent peroxidase-like activity of the conjugate was compared with peroxidase activity of horseradish peroxidase. The hemin-smectite-DOA conjugate exhibited higher activity as the temperature was increased from 30 to 70 degrees C, while horseradish peroxidase activity was reduced as the temperature was increased.

Benzene↗