Rearing of post-larvae of Penaeus monodon in nursery pond-an experimental study

In the present experiment, Poetlarvae of Penaeus monodon received from M/s Hindustan Lever Hatchery, Muttukkadu were reared in a nursery pond at porto Novo. In a span of one month, they were reared to the stockable size of 30 to 48 mm (average size 38 mm) from an initial size of 8 to 12 mm ^average size 10 mm). Pond was suitably prepared after the application of cowdung. Coconut end palm leaves were fixed at the sides of the pond to avoid the direct heat of the sun and evoporation. Clam meat [Meretrix sp.) was used as the supplementary feed at 100% body weight- Hydrographical conditions of the pond waters in relation to length and weight (growth) have been discussed. About 98% recovery was achieved

Stability of Microstructure in Al3003 Builds Made by Very High Power Ultrasonic Additive Manufacturing

Very High Power Ultrasonic Additive Manufacturing (VHP-UAM) system was used to produce aluminum parts from 150 µm thick Al3003-H18 foils. The build was processed at 36 μm vibration amplitude, 8 kN normal load, and 35.6 mm/s weld speed at 20 kHz frequency. Almost 100% linear weld density was achieved. A deformation-interaction volume of ~20 μm was observed below the bonded interface. The microstructural stability including grain boundary structures, and crystallographic orientations was evaluated after annealing these samples at 343oC for 2 hours and 450oC for 2 hours. After heat treatment, small grains persisted at the interfaces with sluggish grain growth kinetics. In contrast, normal grain growth kinetics was observed in the middle of the foils. Possible mechanisms for such phenomena are discussed.Mechanical Engineerin

Age and growth in Telescopium telescopium

In length frequency analysis, model were traced for period of two years and the growth was found to be 55 and 95 mm for I and 11 years respectively. Growth determined by months mode curve indicated that T. telescopium can grow up to 62, 85 and 110 mm in the I, II and III year respectively Growth assessed by probability plot was found to be upto 23,57.5, 91 and 108 mm in the 0, I II and III year respectively. Integrated method showed growth rates of 60, 92 and 111.6 mm respectively in the I, II and III year of life. Employing von Bertalanffy's growth equation It was found that it can grow up to 57.5, 91 and 108 mm respectively in the I, II and III year of life. The empirical length at different ages found by von Bertalanffy's growth equation showed general agreement with the growth estimates others

Suitability of Killai backwaters for prawn farming-a preliminary micro level survey

Brackishwater areas have been given much importance for prawn farming. No information was available on the Killai backwaters about factors like water quality, topography, contour, extent of the area, tidal amplitude, seed potential and possibilities of flooding etc. Hence during 1982-'84 Klllai area was thoroughly surveyed on the above aspects and the results have been discussed in this paper. From this it is inferred that a total area of about 155 ha is readily available for undertaking both pond and pen culture in this backwater

Assessment of knowledge, practice and perception of menstruation among adult women in the reproductive age group, in Mangalore, India

Background: Women often lack knowledge regarding reproductive health including menstruation which can be due to socio-cultural barriers in which they grow up. The present study is aimed at assessing the level of knowledge regarding menstruation and hygienic practices and perceptions during menstruation.Methods: It was a cross sectional study, conducted among 110 adult women to assess their knowledge regarding menstruation, practices followed during menstruation and their perceptionof menstruation. The collected data was analyzed using SPSS version 17. 0. Chi square test was applied. P<0.05 was considered to be significant.Results: Only 52% of the study population has satisfactory knowledge regarding menstruation. Women between 15 to 20 years of age and those from the middle and higher socio-economic groups seem to possess maximum knowledge regarding menstruation. Women of the higher socio-economic group practice better sanitary measures during menstruation with 100% of them using pads, as compared to women of lower socio economic group who showed a trend of using cloth (87.5%). Women of the upper socio-economic class (42.78%) had better perception towards menstruation (p<0.05).Conclusions: It is very important that lower socio-economic group should be educated about the importance of maintaining hygiene during menstruation by proper health education and equip them with skills regarding safe and hygienic practices to prevent the risk for reproductive tract infections

Multiscale Computations on Neural Networks: From the Individual Neuron Interactions to the Macroscopic-Level Analysis

We show how the Equation-Free approach for multi-scale computations can be exploited to systematically study the dynamics of neural interactions on a random regular connected graph under a pairwise representation perspective. Using an individual-based microscopic simulator as a black box coarse-grained timestepper and with the aid of simulated annealing we compute the coarse-grained equilibrium bifurcation diagram and analyze the stability of the stationary states sidestepping the necessity of obtaining explicit closures at the macroscopic level. We also exploit the scheme to perform a rare-events analysis by estimating an effective Fokker-Planck describing the evolving probability density function of the corresponding coarse-grained observables

Control of oocyte release by progesterone receptor-regulated gene expression

The progesterone receptor (PGR) is a nuclear receptor transcription factor that is essential for female fertility, in part due to its control of oocyte release from the ovary, or ovulation. In all mammals studied to date, ovarian expression of PGR is restricted primarily to granulosa cells of follicles destined to ovulate. Granulosa cell expression of PGR is induced by the pituitary Luteinizing Hormone (LH) surge via mechanisms that are not entirely understood, but which involve activation of Protein Kinase A and modification of Sp1/Sp3 transcription factors on the PGR promoter. Null mutations for PGR or treatment with PGR antagonists block ovulation in all species analyzed, including humans. The cellular mechanisms by which PGR regulates ovulation are currently under investigation, with several downstream pathways having been identified as PGR-regulated and potentially involved in follicular rupture. Interestingly, none of these PGR-regulated genes has been demonstrated to be a direct transcriptional target of PGR. Rather, in ovarian granulosa cells, PGR may act as an inducible coregulator for constitutively bound Sp1/Sp3 transcription factors, which are key regulators for a discrete cohort of ovulatory genes

TAp73 is a central transcriptional regulator of airway multiciliogenesis.

Motile multiciliated cells (MCCs) have critical roles in respiratory health and disease and are essential for cleaning inhaled pollutants and pathogens from airways. Despite their significance for human disease, the transcriptional control that governs multiciliogenesis remains poorly understood. Here we identify TP73, a p53 homolog, as governing the program for airway multiciliogenesis. Mice with TP73 deficiency suffer from chronic respiratory tract infections due to profound defects in ciliogenesis and complete loss of mucociliary clearance. Organotypic airway cultures pinpoint TAp73 as necessary and sufficient for basal body docking, axonemal extension, and motility during the differentiation of MCC progenitors. Mechanistically, cross-species genomic analyses and complete ciliary rescue of knockout MCCs identify TAp73 as the conserved central transcriptional integrator of multiciliogenesis. TAp73 directly activates the key regulators FoxJ1, Rfx2, Rfx3, and miR34bc plus nearly 50 structural and functional ciliary genes, some of which are associated with human ciliopathies. Our results position TAp73 as a novel central regulator of MCC differentiation

The Complete Nucleotide Sequences of the 5 Genetically Distinct Plastid Genomes of Oenothera, Subsection Oenothera: II. A Microevolutionary View Using Bioinformatics and Formal Genetic Data

A unique combination of genetic features and a rich stock of information make the flowering plant genus Oenothera an appealing model to explore the molecular basis of speciation processes including nucleus–organelle coevolution. From representative species, we have recently reported complete nucleotide sequences of the 5 basic and genetically distinguishable plastid chromosomes of subsection Oenothera (I–V). In nature, Oenothera plastid genomes are associated with 6 distinct, either homozygous or heterozygous, diploid nuclear genotypes of the 3 basic genomes A, B, or C. Artificially produced plastome–genome combinations that do not occur naturally often display interspecific plastome–genome incompatibility (PGI). In this study, we compare formal genetic data available from all 30 plastome–genome combinations with sequence differences between the plastomes to uncover potential determinants for interspecific PGI. Consistent with an active role in speciation, a remarkable number of genes have high Ka/Ks ratios. Different from the Solanacean cybrid model Atropa/tobacco, RNA editing seems not to be relevant for PGIs in Oenothera. However, predominantly sequence polymorphisms in intergenic segments are proposed as possible sources for PGI. A single locus, the bidirectional promoter region between psbB and clpP, is suggested to contribute to compartmental PGI in the interspecific AB hybrid containing plastome I (AB-I), consistent with its perturbed photosystem II activity