(1) The results show sustained brain levels of E2-Quat and prolonged half-life in brain compared to six peripheral tissues measured.
(2) The quaternaries present in organoclays (e.g., BENTONE type products) can also be identified by prior destruction of the silicate with hydrofluoric acid followed by chromatography of the residual quat fluorides.
(3) A reversed-phase high-performance liquid chromatographic (HPLC) method is presented for the analysis of E2-CDS and its oxidized quaternary metabolite (E2-Quat) in biological fluids or tissues.
(4) This surface complexation reaction was studied in detail by using a spin-labelled quat of intermediate allergenicity.
(5) The only exception was a Quat which did not disinfect fully even after 18 hours application.
(6) Two of the quats tested were found to be strong allergens which was due to stable association with membrane lipids at the surface of epidermal cells.
(7) A homologous series of eight quaternary ammonium salts (quats) were used as complex cations in a survey of contact hypersensitivity in guinea pigs.
(8) Mixtures of aliphatic and aromatic "quats" can be qualitatively identified in a one step chromatographic run.
(9) The effects of 26 different cosmetic ingredients (e.g., permanent wave and hair dye compounds, emulsifiers, resins, and detergents such as quats) were assessed by four end points indicative for qualitatively and quantitatively different cytotoxicity: (1) neutral red uptake reduction after 24 h of treatment (NR-90 and NR-50); (2) cell detachment from culture dish after 4 h of treatment (CD-25); (3) growth inhibition after 48 h of treatment (GI-50); and (4) membrane permeability measured by fluorescent dye retention (fluorescence shift FS-25) and dye exclusion (viability ratio VR-25).
(10) Previous work has indicated that a modified Quate-Lemons scanning acoustic microscope (SAM) is capable of measuring the acoustic propagation properties of sections of biological tissue.
(11) As the tiny ferry pushed through the waves and mist, marketing officer Amanda Anderson was busy on the phone to Raymond Blanc's Le Manoir aux Quat'Saisons , which has added it to its daily breakfast menu.