134 research outputs found
Penaeus semisulcatus: A potential species for commercial culture along Tamilnadu coast
Major portion of the marine export products
By value wise, is being contributed by shrimps.
Three fourth of exported shrimps is from sea and
The rest from culture. Since the exploitation of
Shrimps has already reached optimum level in
Indian coastal waters, one alternative is to
Increase shrimp entering shrimp culture for
Quick and high returns. Farming technology for
P.monodonand P.indicus has been considerably developed than
that for the other species
of Indiancoast. Prime species that are cultured
successfullyat present in India are P.monodon .
andP.indicus in the order of trade preference.
But in Japanese market P.semisulcatus, a
Striped shrimp is fetching higher price than
P.indicus. Information on grow-out practices of
P.semisulcatusis scanty. Experimental-scale
cuRurehas been attempted in Kuwait, Israel,
Bahrain,Taiwan, and Malaysia
Differential effects of cholesterol and 7-dehydrocholesterol on ligand binding of solubilized hippocampal serotonin<SUB>1A</SUB> receptors: implications in SLOS
The serotonin1A receptor is an important member of the G-protein coupled receptor family, and is involved in the generation and modulation of a variety of cognitive, behavioral, and developmental functions. Solubilization of the hippocampal serotonin1A receptor by 3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate (CHAPS) is accompanied by loss of membrane cholesterol which results in a reduction in specific agonist binding activity. Replenishment of cholesterol to solubilized membranes restores the cholesterol content of the membrane and significantly enhances specific agonist binding activity. In order to test the stringency of the requirement of cholesterol in this process, we solubilized native hippocampal membranes followed by replenishment with 7-dehydrocholesterol (7-DHC). 7-DHC is an immediate biosynthetic precursor of cholesterol differing only in a double bond at the 7th position in its sterol ring. Our results show, for the first time, that replenishment of solubilized hippocampal membranes with 7-DHC does not restore ligand binding activity of the serotonin1A receptor, in spite of recovery of the overall membrane order. This observation shows that the requirement for restoration of ligand binding activity is more stringent than the requirement for the recovery of overall membrane order. These novel results have potential implications in understanding the interaction of membrane sterols with this important neuronal receptor under pathogenic conditions such as the Smith-Lemli-Opitz syndrome
Larval rearing of mud crab, Scylla tranquebarica (Fabricius, 1798) and feeding requirements of its zoea
Feeding experiments were conducted with zooplankton to find out the suitable food for zoea1 of the mud crab
Scylla tranquebarica. Zoeae1 from seven berried females, three from wild and four from rematured specimens
were the source material for the present study. The veliger larvae (50-55μm) of pearl oyster and two
species (Pseudodiaptomus spp. and Labidocera spp.) of pelagic copepods (500-1000 μm) were tested as
feed. However, the zoea1 accepted only the former. The feeding activity could be resolved into 5 stages.
Significant role of the serrated caudal setae in prey abrasion into required size suitable to mandibles for
mastication and the size preference of the items of diet in relation to the growth of the mandibles with the
advancement of zoeal stage also have been discussed. In all the 7 feeding experiments that were conducted by
providing rotifer, Brachionus rotundiformis (<100 μm), the zoea1 advanced to zoea3/zoea4 or the first crab
stage. The present study is a significant development in narrating the feeding behaviour of zoea1
Observations on the growth of Penaeus semisulcatus in the nursery ponds
Hatchery produced postlarvae (PL 40) of green tiger prawn Penaeus semisulcatus were stocked in three earthen ponds at a rate of 40,0001ha in one (400 sq.m) and 50,00O/ha, in two ponds (800 sq. m) in November 1993 and reared for 110 days. During February-March water level and salinity in the ponds were raised by pumping water (25% salinity) from adjacent lagoon. Pond water was fertilised with urea and Ammonium phosphate at a rate of 50 kgha and 100 kgha respectively, 15 days before stocking. Shrimps were fed with commercial pellet feed. The survival was 51.9%, 15.0% and 65.8% in pond I, I1 and 111 respectively. The length and weight increment was 68.42 mm and 7.95 g in pond I; 65.78 mm
and 8.25 g in pond 11; and 53.14 mm and 4.85 g in pond 111. Difference in growth between sexes was statistically significant in all three ponds on day 110. Growth in pond III was poor as compared to other two ponds due to prevalence of low salinity (~12%) for a period of 48 days
Tagging experiments on searanched Penaeus indicus in the Palk Bay, southeast coast of India
An attempt has been made to study the suitability of hatchery raised and farm
grown Penaeus indicus for searanching, and to study the growth and movement
of ranched population in the Palk Bay and the Gulf of Mannar. The eggs
released by a spawner without eyestalk ablation were raised upto juveniles
through rearing in the hatchery, nursery cement tanks and in earthern ponds.
The hatching rate and subsequent survival rate from nauplius-1 to PL-1 was
92.3 and 53.0 % respectively. Survival from PL-1 to PL-21 was 49.5 %. The
seeds thus raised were stocked in two coastal earthern ponds at a rate of
50,000/ha and fed with pellet diet daily at the rate of 5-10 % of biomass. After
111 days, retrieval was 41.45 % in pond I and 75 % in pond II. The growth
was from 22.95 mm TL to. 111.7 mm TL/10.1 g wt. in pond I and 103.06 mm
TIV 8.1 g wt. in pond II. These juvenile prawns were tagged with loop tags
and released in the Palk Bay off Mandapam at 3 m depth. Recovery started
from the subsequent day onwards in the trawl catches of Palk Bay and Gulf
of Mannar and continued upto 28 days. Of the 3,430 prawns released, only
19 were recovered accounting for <1 % recapture. Distribution and movement
of tagged prawns and the prospects of searanching of P. indicus have been
discussed
Selective determination of pyridine alkaloids in tobacco by PFTBA ions/analyte molecule reaction ionization ion trap mass spectrometry
Prawn fauna (Crustacea: Decapoda) of India - An annotated checklist of the Penaeoid, Sergestoid, Stenopodid and Caridean prawns
Twenty four species of Pandalid shrimps reported from the
Indian waters, of which six genera (Chlorotocella, Chlorotocus,
Chlorocurtis, Dorodotes, Heterocarpoides and Stylopandalus)
are represented by single species each. The genera, Plesionika
and Heterocarpus are represented by eleven and seven species
respectively. Plesionika adensameri (Balss, 1914) a deep-sea
shrimp hitherto unreported from Indian waters is recorded from
west coast of India. Information on some biological aspects of
few Pandalid shrimps from Indian waters is also reported in the
present paper
Bimolecular quadruplexes and their transitions to higher-order molecular structures detected by ESI-FTICR-MS
Evaluation of effects of bivalent cations on the formation of purine-rich triple-helix DNA by ESI-FT-MS
Investigation of formation, recognition, stabilization, and conversion of dimeric G-quadruplexes of HIV-1 integrase inhibitors by electrospray ionization mass spectrometry
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