The systolic time intervals of the left ventricle in 30 patients with ischemic heart disease but without heart failure were compared with those of 30 normal individuals before and after inhalation of amyl nitrite by using polygraphic recordings. In the normal subjects, following amyl nitrite, the ejection-time index was significantly prolonged, and the pre-ejection period and its index were sig...

Under carefully controlled conditions, the triethylborane-air combination proves to be an efficient radical initiator that allows intermolecular radical additions of S-2-oxoalkyl-thionocarbonates (S-xanthates) to olefins. Depending on both the structures of the xanthate and the olefin, the addition process can be achieved at room temperature or slightly higher.

Flavones were directly alkylated at the C-3 position in moderate yields using a xanthate-based oxidative radical addition procedure. This methodology is a suitable synthetic tool for the direct substitution of the vinylic and unactivated C-H bond of the C ring of the flavone by an alkyl functionality under neutral conditions.

In the title compound, C(5)H(8)O(3)S(2), the C-S and C-O bonds in the xanthate unit are shorter than those linked to it. In the crystal, inversion dimers linked by pairs of O-H⋯O hydrogen bonds occur.

Materials-The pigeon liver extract preparation and the substrates required for the synthesis of glycinamide ribotide have been described previously (l-4). Intestinal phosphatase, purified grade, was obtained from Pentex, Inc., Kankakee, Illinois. Adenosine-5’-phosphate was obtained from the Ernst Bischoff Company, Inc., Ivoryton, Connecticut. Adenosine-3’-phosphate was obtained from the Schwarz...

Materials-The pigeon liver extract preparation and the substrates required for the synthesis of glycinamide ribotide have been described previously (l-4). Intestinal phosphatase, purified grade, was obtained from Pentex, Inc., Kankakee, Illinois. Adenosine-5’-phosphate was obtained from the Ernst Bischoff Company, Inc., Ivoryton, Connecticut. Adenosine-3’-phosphate was obtained from the Schwarz...

• Lead sulphite passivated galena surfaces. Sulphite ions interacted with free lead to form sulphite. Dithionite decomposition products degraded xanthate in solution. are potential determining at the mineral surface. The recovery of sulphide minerals is depressed high dithionite concentrations. Sulphoxy anions recycled flotation process waters possess reduce efficacy reagents. In this study, an...

In this study, surface chemistry and flotation properties of the gold-bearing galena pyrite minerals Menderes region, Izmir, Turkey were investigated with use xanthate-thiocarbamate-monothiophosphate collectors. context, micro-flotation experiments, zeta potential, bubble-particle attachment time measurements conducted in presence Thiophosphate (Aero S-8045), Xanthate (SIBX), Thiocarbamate floa...