Effect of boiling and frying on the content of essential polyunsaturated fatty acids in muscle tissue of four fish species

Frozen samples of common fish species, sea trout (Salmo trutta), from Norway and Siberia, herring (Clupea harengus pallasi), rock sole (Lepidopsetta bilineata) and cod (Gadus morhua maris-albi), collected from a wholesale market in Krasnoyarsk city (Siberia, Russia) were analyzed. Special attention was paid to long-chain essential polyunsaturated fatty acids: eicosapentaenoic, 20:5ω3 (EPA) and docosahexaenoic, 22:6ω3 (DHA). Heat-treatment (cooking and frying) did not in general significantly decrease the contents of EPA and DHA compared to raw fish species, except for a modest reduction in Norwegian trout during frying. Boiled trout appeared to be a more valuable fish dish for obtaining the officially recommended appropriate daily intake of EPA + DHA for humans. Herring and sole had intermediate values, while boiled cod had a comparatively low value.     

Establishment and Development of Metrological Assurance for Instruments Measuring Low-Frequency Electric Field Strengths

The development of standard instruments for measuring low-frequency electric field strength over the past 15 years is chronicled.     

Fundamental propositions of a general theory of radio-frequency generator and measuring antennas

Fundamental formulas, which, within the framework of the physical model employed, describe the generation and measurement of electric field strength, are presented. __________ Translated from Izmeritel'naya Tekhnika, No. 8, pp. 44–47, August, 2008.     

Oxidation resistance before and after heat treatment for compacted Al<Subscript>2</Subscript>O<Subscript>3</Subscript>–SiC–C mixtures with aluminum-chromium-phosphate binder

Oxidation resistance has been examined for compacted Al₂O₃–SiC–C mixtures, which contain an aluminum-chromium-phosphate binder without firing (DTA method) and ones that have been previously fired and given isothermal heat treatment at 800°C (as indicated by the mass loss). To obtain oxidation-resistant materials, the content of silicon carbide should not exceed 10 wt.% and the recommended graphite content is not more than 20 wt.%. Translated from Novye Ogneupory, No. 2, pp. 38 – 43, February, 2009.     

Properties of materials of the system Al<Subscript>2</Subscript>O<Subscript>3</Subscript>-SiC-C after firing in a reducing atmosphere

A set of studies is presented for the physicomechanical properties of corundum-graphite carbide-containing refractories. The efficiency of introducing silicon carbide as an antioxidant addition to Al₂O₃-SiC2-C-materials is established. The structure and phase composition of corundum-graphite silicon carbide-containing refractories based on an ethyl silicate binder fired in a reducing atmosphere are studied. __________ Translated from Novye Ogneupory, No. 10, pp. 52–56, October 2007.     

The fields and currents of a thin biconical antenna. The parameters of a radiating antenna

A theoretical analysis of the operation of a thin radiating biconical antenna is given. Formulas are obtained for the current distribution in the antenna and its input impedance. __________ Translated from Izmeritel’naya Tekhnika, No. 1, pp. 43–47, January, 2008.     

Theoretical Principles of a High-Frequency Magnetic Field Standard Based on a Frame Antenna. Part I

An exact solution has been obtained to the integral equation for the current in a frame antenna built with an infinitely narrow gap. The total current at the input is infinite because of the infinite capacity of the gap and the finite thickness of the antenna.