The growth, reproductive properties and the variations in total lipids and fatty acids in the gonads and muscle tissue of the mantis shrimp Squilla mantis （Crustacea： Stomatopoda） caught from the gulf of Gabes in T...The growth, reproductive properties and the variations in total lipids and fatty acids in the gonads and muscle tissue of the mantis shrimp Squilla mantis （Crustacea： Stomatopoda） caught from the gulf of Gabes in Tunisia were studied by sampling carried out between Jan. 2005 and Dec. 2006 to elucidate the importance of these components during sexual maturation. A total of 16,569 specimens were examined. The sex of this species was determined macroscopically and the proportion of females （47.07%） was significantly lower than that of males （52.93%） with a ratio of 1 ：l. 12 （male^female）. The mean total lengths （TL） of the male and female individuals were 142.02 ~： 22.76 mm and 141.45 ＋ 24.37 mm, respectively. Length-weight （TL-W） relationship was estimated as W = 7 ~ l06 TL3 o644 for females and W = 4 ~ 10＂6 TL320o7 for males, being altometrically positive for both sexes. The reproductive season, evaluated from the gonado-somatic index （GS1）, extended from Dec. to July, with a peak in Feb.. The smallest mature female was 93 mm total length. Fifty percent of the females were mature at 147.19 mm total length. The levels of lipid displayed pronounced seasonal fluctuations with the highest value in Feb. and the lowest value in Oct.. Major fatty acids in both gonads and muscle tissue （female and male） were C 14：0, C 16：0, C 18：0, C 18： I n-9, C 18：2n-6, C 18：3n-3, C20：4n-6, C20：5n-3 and C22：6n-3. Significant increases in the levels of saturated and poly-unsaturated fatty acids were observed in gonads. The levels of n-3 poly-unsaturated fatty acids （PUFA）, particularly C20：5n-3, decreased in gonads as ovarian development proceeded. Docosahexaenoic acid （DHA）, linoleic acid （LA） and eicosapentaenoic acid （EPA） were the most abundant polyunsaturated fatty acids （PUFAs） in the muscle tissue for both male and female. The highest percentages for EPA and DHA were found in winter and summer season for Squilla mantis in the Gulf of Gabes. The n-3/n展开更多
The present paper provides a numerical investigation of the decoherence effect induced on a quantum heavy particle by the scattering with a light one.The time dependent two-particle Schr¨odinger equation is solve...The present paper provides a numerical investigation of the decoherence effect induced on a quantum heavy particle by the scattering with a light one.The time dependent two-particle Schr¨odinger equation is solved by means of a time-splitting method.The damping undergone by the non-diagonal terms of the heavy particle density matrix is estimated numerically,as well as the error in the Joos-Zeh approximation formula.展开更多
文摘The growth, reproductive properties and the variations in total lipids and fatty acids in the gonads and muscle tissue of the mantis shrimp Squilla mantis （Crustacea： Stomatopoda） caught from the gulf of Gabes in Tunisia were studied by sampling carried out between Jan. 2005 and Dec. 2006 to elucidate the importance of these components during sexual maturation. A total of 16,569 specimens were examined. The sex of this species was determined macroscopically and the proportion of females （47.07%） was significantly lower than that of males （52.93%） with a ratio of 1 ：l. 12 （male^female）. The mean total lengths （TL） of the male and female individuals were 142.02 ~： 22.76 mm and 141.45 ＋ 24.37 mm, respectively. Length-weight （TL-W） relationship was estimated as W = 7 ~ l06 TL3 o644 for females and W = 4 ~ 10＂6 TL320o7 for males, being altometrically positive for both sexes. The reproductive season, evaluated from the gonado-somatic index （GS1）, extended from Dec. to July, with a peak in Feb.. The smallest mature female was 93 mm total length. Fifty percent of the females were mature at 147.19 mm total length. The levels of lipid displayed pronounced seasonal fluctuations with the highest value in Feb. and the lowest value in Oct.. Major fatty acids in both gonads and muscle tissue （female and male） were C 14：0, C 16：0, C 18：0, C 18： I n-9, C 18：2n-6, C 18：3n-3, C20：4n-6, C20：5n-3 and C22：6n-3. Significant increases in the levels of saturated and poly-unsaturated fatty acids were observed in gonads. The levels of n-3 poly-unsaturated fatty acids （PUFA）, particularly C20：5n-3, decreased in gonads as ovarian development proceeded. Docosahexaenoic acid （DHA）, linoleic acid （LA） and eicosapentaenoic acid （EPA） were the most abundant polyunsaturated fatty acids （PUFAs） in the muscle tissue for both male and female. The highest percentages for EPA and DHA were found in winter and summer season for Squilla mantis in the Gulf of Gabes. The n-3/n
基金Thiswork has been supported by the GREFI-MEFI(Groupement De Recherche Europ´een Franco-Italien)and the ANR QUATRAIN(Quantum transport in nanostructures).The authors would like to thank the Laboratoire LATP of the University of Provence and the University of Milano Bicocca for the support and the kind hospitality.
文摘The present paper provides a numerical investigation of the decoherence effect induced on a quantum heavy particle by the scattering with a light one.The time dependent two-particle Schr¨odinger equation is solved by means of a time-splitting method.The damping undergone by the non-diagonal terms of the heavy particle density matrix is estimated numerically,as well as the error in the Joos-Zeh approximation formula.
