Ramachandran, A; Sankar, T V(Society of Chemical Industry, November 26, 2004)
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Abstract:
The characteristics and stability of natural actomyosin (NAM) from rohu (Labeo rohita), catla
(Catla catla) and mrigal (Cirrhinus mrigala) were investigated. The total extractable actomyosin (AM)
was higher (7.60mgml−1) in the case of rohu compared with that from catla and mrigal (5mgml−1).
Although the specific AM ATPase activity was similar (0.43–0.5 μmolPmin−1 mgP−1) among the three
species, the total ATPase activity was lower in mrigal (25 μmol g−1 meat) compared with the other species
(37 μmol g−1 meat). The inactivation rate constants (kd) of AM Ca ATPase activity showed differences in
the stabilities of actomyosin among these fish, the actomyosin from catla being least stable. The NAM
from these species was stable up to 20 ◦C at pH 7.0. Catla AM became unstable at 30 ◦C, while rohu and
mrigal AM could withstand up to 45 ◦C. The thermal denaturation with respect to solubility, turbidity,
ATPase activity, sulphhydryl group and surface hydrophobicity showed noticeable changes at around
these temperatures
Madhusoodana Kurup,B; Thomas, Joice V; Sreedevi, C(Indian Journal of Marine Sciences, September , 2006)
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Abstract:
Variations of the infaunal polychates populations due to bottom trawling were studied during December 2000 to November 2002 at depth ranging from 0-50 m along Cochin-Munambam area (Kerala, long. 76degree10'94" to 75degree 56' and lat.9degree58' to 10degree10'), in the southwest coast of India.Infaunal polychaetes from the sediment samples were collected both before and after experimental trawling in order to assess the variations on their abundance (no.m-2),biomass(g.m-2) and diversity due to bottom trawling .Highest variations in polychaetes were recorded at station 9 in May 2002 where polychaete abundance increased to 20710 no.m-2 after trawling from 2787 no.m-2 before trawling.Biomass showed highest variations at station 3 in December 2000 where biomass increased from 7.16g.m-2 recorded before trawling to 34.53 g.m-2 in the samples collected after trawling .Multivariate community analysis carried out based on both species abundance and biomass of plychaetes also confirm the wide variations in the similarities of the stations comparing both before and after trawling