1,638 research outputs found
Influence of mangrove ecosystem on the biological resources and fishery of Kakinada
Since there are no records of detailed
investigation on the ecology of the mangrove
Kakinada around Kakinada and keeping in view
of the vastness, fertility and biological resources
of the Kakinada Bay and the adjacent sea, the
Institute took initiative to conduct a study on the
ecology of mangrove areas around Kakinada
during 1982-'85 to understand the various
ecological aspects connected to the water, soil/
sediment and mangrove-associated fauna and
their influence on fisheries
Studies on the mangrove ecosystem
Mangrove ecosystem is one of the most specialised and
productive coastal habitats in the world. Due to human interference
in many ways, most of the mangrove forests are on the verge of
destruction and disappearance. The main causes for the
degradation of Indian mangroves are land reclamation, pollution
and overexploitation of the resources. A proper understanding of
this specialised ecosystem and careful implementation of the
conservation measures would alone save the ecosystem from further
destruction and extinction. The present account deals with the
ecological aspects of the mangrove habitats covering their extent,
distribution, zonation, biological assemblage, hydrography and
productivity, and giving importance to their role, man-made impacts
and conservation aspects with emphasis on the approaches for the
sustainable use of this ecosystem to the mankind with special
reference to the mangroves of India
Occurrence of giant male and female groupers with a note on sex change in groupers
Serranid fishes are popularly known as
'Groupers' or 'Rock cods' and locally 'Kalava'.In view of their importance
in the capture and culture fisheries, the
present account on the record of giant female
groupers [Epinephelus tauuina (Forskal),
Epinephelus malabaricus (Bloch and Schneider)
and Promicrops lanceolatus (Bloch)] of more
than two metres in total length and their sex
ratio] in the natural population from the Indian
coast (Table 1) deserves special attention
Mariculture in India, its potentialities and practical applications
India is passing through a very
critical period of food crisis and consequentiy
calling for the necessity
of adopting various techniques and
methods to augment the food production.
Among them , mariculture is an important
means of getting additional source of
human food
In silico molecular docking and in vitro antimicrobial efficacy of phytochemical compounds of Lantana camara Linn.
The rise of multi-drug resistant bacteria and the extensive use of antibiotics has become a serious threat worldwide. The side effect of antibiotics swirled the researchers towards traditional medicine to find a therapeutic agent with antibacterial activity. The phytochemical compound from medicinal plants paves a way for the novel antibacterial agent.┬а In the present study, in silico molecular docking of phytochemical compounds identified through GC-MS analysis and in vitro antibacterial efficacy of ethanolic leaf extract of Lantana camara were evaluated. In silico docking studies of 11 Phyto-ligands were carried out against 4 motifs- 1PHO, 5I5H, 5UW2 and 6NTW of Escherichia coli to estimate the binding energy and to know the protein-ligand interaction. Amongst all the phyto-ligands studied, 4,8,13-Cyclotetradecatriene-1,3-diol,1,5,9-trimethyl-12-(1-methylethyl) showed good affinity towards 1PHO, 4a(2H)-Phenanthrenecarboxaldehyde,1,3,4,9,10,10a-hexahydro-6-methoxy-1,1-dimethyl-7-(1-methylethyl) exhibited highest affinity with 5I5H motifs of┬а E. coli, 4,8,13-Cyclotetradecatriene-1,3-diol, 1,5,9-trimethyl-12-(1-methylethyl) showed better affinity towards motif 5UW2 of┬а E. coli and (Z)-4-Nitro-alpha-(p-nitrophenyl)cinnamic acid showed good affinity towards 6NTW motif of┬а E. coli. The ethanolic leaf extract of L. camara L. showed concentration dependent activity against E. coli
Greenhouse evaluation of Beauveria bassiana (Balsamo) Vuillemin against Aphis craccivora (Das) on Fenugreek
The bioassay studies were carried out to determine the LC50 and LT50 of Beauveria bassiana against Aphis craccivora on fenugreek under greenhouse conditions. The results revealed that, the cumulative corrected mortality (CCM) was 43.50% at higher concentration (1├Ч1010 spores/ml) and it was 20.85% at lowest concentration (1├Ч104 spores/ml) at one day after treatment (DAT). The CCM decreased with decreasing conidial spore concentration. Likewise, at 2, 3, 4, 5, 6 and 7 DAT, almost same trend was observed. At 7 DAT, the CCM was 85.04% and 55.21% at 1├Ч1010 spores/ml and 1├Ч104 spores/ml, respectively. The LC50 value of B. bassiana against A. craccivora was 1.2├Ч108 spores/ml. Mean lethal time (LT50) values were worked out 73, 89, 97, 112, 126, 138 and 157 hours for 1010, 109, 108, 107, 106, 105 and 104 spores/ml, respectively. By testing the field efficacy of B. bassiana against A. craccivora, this insect pathogenic fungus can be used as potential biocontrol agent for the sustainable management of aphid in fenugreek crop
OPTIMIZATION OF SURFACE ROUGHNESS OF AISI 304 AUSTENITIC STAINLESS STEEL IN DRY TURNING OPERATION USING TAGUCHI DESIGN METHOD
The present work is concentrated with the dry turning of AISI 304 Austenitic Stainless Steel (ASS). This paper presents the influence of cutting parameters like cutting speed, feed rate and depth of cut on the surface roughness of austenitic stainless steel during dry turning. A plan of experiments based on TaguchiтАЩs technique has been used to acquire the data. An orthogonal array, the signal to noise (S/N) ratio and the analysis of variance (ANOVA) are employed to investigate the cutting characteristics of AISI 304 austenitic stainless steel bars using TiC and TiCN coated tungsten carbide cutting tool. Finally the confirmation tests that have been carried out to compare the predicted values with the experimental values confirm its effectiveness in the analysis of surface roughness
Notes on the juveniles of the rock cod Epinephelus tauvina (Forsskal)
The occurrence of the very young juveniles of the rock cod Epinephelus tauvina (Forskal) in Cochin
backwater during February-June is reported here with brief notes on the morphometric variations between
juveniles and adults and food and feeding habits of juveniles
Sediment and water characteristics of selected prawn farming sites at Cochin during premonsoon months
This paper deals with the studies on sediment and water characteristics of selected shrimp
farming ponds located at Puthuvyppu and Valappu villages of Vypeen in the vicinity of
Cochin carried out during premonsoon period (March-May 2001). Areawise distribution of
sediment and water characteristics revealed that smaller and medium sized ponds were
relatively more fertile than the larger sized ponds. Overall mean values of nutrients in sediment
and water indicated that ponds at Puthuvyppu village (with high tidal influence) were relatively
more fertile than those ponds at Valappu. TSS and primary productivity values also showed
the same trend. Highly significant positive correlation was observed between clay and silt,
organic carbon and available potassium, nitrite-N in sediment and water, salinity and TSS and
water pH and dissolved oxygen
Some observations on primary production and plankton biomass along the continental shelf and slope off the northeast coast of India during January 1989
The present study deals with the quantitative aspects of chlorophyll pigments,
primary productivity and plankton biomass from the continental shelf and slope off
the northeast coast of India between 16┬░ and 20┬░N latitudes towards the end of
northeast monsoon season. In surface waters, the mean values of chl-a, -b, and -c
were 0.249,0.275 and 0.837 mg/m^ along the shelf and 0.246,0.260 and 0.805 mg/m^
in the slope respectively while the net primary productivity values were 0.074 and
0.081 g C/m /d for the shelf and slope waters respectively. Column productivity in
the upper 0-50 m water in the shelf and slope regions were 2.9 and 3.25 g C/m /d with
an average production of 3.08 g C/m /d. Higher rate of production was observed
around 18┬░ and 20┬░N latitudes. Zooplankton biomass exhibited progressive increase
in volume from 16┬░ to 20┬░N. The estimated mean zooplankton biomass volume of the
study area was 28.83 ml/m . The mean transfer coefficient from primary to secondary
production was found to be 14% when 50% of the zooplankton biomass was
considered as the daily rate of production. From the mean primary and secondary
productivity values, potential tertiary production of pelagic fishery resources in the
upper 0-50 m water column of the study area for the month was assessed
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