Length-weight relationships of marine fishes from the central Brazilian coast

Parameters of the length-weight relationship are presented for 85 fish species from the marine and estuarine regions of the central Brazilian coast (latitude 13° to 23° S). Three different methods were used. A non-linear iterative process using the quasi-Newton algorithm yielded a better fit for all data sets analyzed. The length-weight allometry coefficient b estimated from standard length data tended to be lower than from total length data. The difference between these estimates was significant for some species

Length-weight relationships of marine fishes from the central Brazilian coast

Parameters of the length-weight relationship are presented for 85 fish species from the marine and estuarine regions of the central Brazilian coast (latitude 13° to 23° S). Three different methods were used. A non-linear iterative process using the quasi-Newton algorithm yielded a better fit for all data sets analyzed. The length-weight allometry coefficient b estimated from standard length data tended to be lower than from total length data. The difference between these estimates was significant for some species.Length-weight relationships, Marine fish, Stock assessment, Brazil,

Fabrication Of A Spun Elliptically Birefringent Photonic Crystal Fiber And Its Characterization As An Electrical Current Sensor

In this paper a spun elliptically birefringent photonic crystal fiber is fabricated and characterized. Its performance as a current sensor, using a polarimetric configuration, was tested and compared against single mode fiber at 633 nm. In particular the sensor sensitivity and linearity was investigated using fiber loops with different radius or number of turns around the conductor. The results obtained show that the spun fiber (40 rotation per meter) is able to suppress quite effectively the effects of the bend induced birefringence as compared to the standard fiber. © 2013 SPIE.8794 Innovative Economy National Cohesion Strategy,InPhoTech Ltd.,AMS Technologies,PHOENIXSilva, R., Optical current sensors for high power systems: A review (2012) Appl. Sci., 2, pp. 602-628GForman, P., Jahoda, F., Linear birefringence effects on fiber-optic current sensors (1988) Applied Optics, 27 (15), pp. 3088-3096Rose, A.H., Ren, Z., Day, G., Twisting and annealing optical fiber for current sensors (1996) Journal of Lightwave Technology, 14 (11), pp. 2492-2498Laming, R.I., Payne, S., Electric-current sensors employing spun highly birefringent optical fibers (1989) Journal of Lightwave Technology, 7 (12), pp. 2084-2094Michie, A., Spun elliptically birefringent photonic crystal fibre for current sensing (2007) Meas. Sci. Technol, 18, pp. 3070-307

Fabrication And Characterization Of Spun Hibi Pcf Fibers For Current Sensing Applications

In this paper three highly birefringent (HiBi) spun photonic crystal fibers (PCF) are fabricated and their performance are characterized for electrical current measurement. These fibers are tested by coiling them around an electric conductor using three distinct winding diameters with different turns. The results present a very good linear relation with the current and its sensitivity depends on the winding diameter and on the number of turns. For the larger winding diameter, the fiber with lower circular pitch had higher sensitivity and for the smaller winding diameter the best sensitivity result was for the fiber with higher circular pitch. © 2014 SPIE.9157BaySpec,COPSESA,et al.,FiberCore,FiberSensing,OZ OpticsEl-Khozondar, R.J., Koch, A.W., Magnetic field inhomogeneity induced on the Magneto-optical current sensors (2011) Information PhotonicsRahmatian, F., High-voltage current and voltage sensors for a smarter transmission grid and their use in live-line testing and calibration (2010) Power and Energy Society General Meeting, pp. 10-12Donaldson, E.F., Gibson, G.R., Pilling, N.A., Taylor, B.T., Hybrid optical current transformer with optical and power-line energisation (2000) Generation, Transmission and Distribution, 147 (5), pp. 304-309Laming, R.I., Payne, D.N., Electric current sensors employing spun highly birefringent optical fibers (1989) Journal of Lightwave Technology, 7 (12), pp. 2084-2094Gubin, V.P., Isaev, V.A., Morshnev, S.K., Sazonov, A.I., Starostin, N.I., Chamorovsky, Y.K., Oussov, A.I., Use of Spun optical fibres in current sensors (2006) Quantum Electronics, 36 (3), pp. 287-291Michie, A., Canning, J., Lyytikäinen, K., Aslund, M., Digweed, J., Temperature independent highly birefringent photonic crystal fibre (2004) Optics Express, 12 (21), pp. 5160-5165Michie, A., Canning, J., Bassett, I., Haywood, J., Digweed, K., Ashton, B., Stevenson, M., Lau, A., Spun elliptically birefringent photonic crystal fibre for current sensing (2007) Measurement Science and Technology, 18 (10), pp. 3070-3074Russell, P., Photonic crystal fibers (2003) Science, 299 (5605), pp. 358-362. , New York, N. YWest, R.H., Dispersion of verdet constant in stress-birefringent silica fibre (1984) Electronics Letters, 20 (22), pp. 20-2

Characterization of a methionine-rich protein from the seeds of Cereus jamacaru Mill. (Cactaceae) <A NAME="Home"></A>

We describe here the isolation and characterization of a major albumin from the seeds of Cereus jamacaru (Cactaceae), to which we gave the trivial name of cactin. This protein has a molecular mass of 11.3 kDa and is formed by a light chain (3.67 kDa) and a heavy chain (7.63 kDa). This protein was isolated using a combination of gel filtration chromatography and reverse-phase HPLC. The amino acid composition of cactin was determined and found to resemble that of the 2S seed reserve protein from the Brazil nut, a protein remarkable for its high methionine content. The usefulness of cactin as a molecular marker in the taxonomy of the Cactaceae is discussed