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Editorial: Journal of Environment & Biotechnology Research

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Page 1, October 2015

K. Vijayaraghavan


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Induced ovulation and spawning of African catfish Clarias gariepinus (Bloch) using ovaprim

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 2-9, October 2015

Kasi Marimuthu,  Nirmell Satthiyasilan,  M. Aminur Rahman,  A. Arshad,  M. Gokul Raj, Jesu Arockiaraj


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ABSTRACT

Experiments were conducted to study the effects of different doses of ovaprim in stimulating ovulation and spawning response of African catfish, Clarias gariepinus. Nine matured female and 9 male fishes weighing from 1.46 to 2.80 kg were randomly selected for three different doses of hormonal injection. Both male and female fishes from all the three replicate groups (3 females and 3 males per replicate) were administered a single dose of 0.4, 0.5 and 0.6 mL of ovaprim/kg body weight (BW), respectively. After 12 h of post-injection, the females were stripped individually into dry and pre weighed plastic containers to record the stripped egg weight per female. The breeding performance was assessed on the basis of total egg mass and stripping response. To assess the egg quality of hormone induced fishes, the fertilization rate and hatching rates were examined among the three doses administered. Complete ovulation was observed in all the three doses of hormonal injection. The results indicated that the total weight of stripped eggs were significantly highest (P < 0.05) at the individuals received 0.4 mL ovaprim/kg BW compared to those injected with other higher doses. Highest fertilization (97.88%) and hatching (93.66%) were also recorded in the individuals received 0.4 mL ovaprim/kg BW. However, breeding performance and egg quality were not statistically significant among the three hormone doses tested in this study. Hence, it is evidenced that ovaprim, the synthetic gonadotropin-releasing hormone with a dopamine antagonist at a dose of 0.4 mL/kg BW could be used as an appropriate spawning dose for C. gariepinus.
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Biosorption of lanthanide (praseodymium) using Ulva lactuca: Mechanistic study and application of two, three, four and five parameter isotherm models

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 10-17, October 2015

K. Vijayaraghavan


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ABSTRACT

Biosorption of praseodymium(III) ions from aqueous solutions using green seaweed (Ulva lactuca) was investigated. Biosorption pH edge experiments revealed that increasing the equilibrium pH favoured biosorption of Pr(III) ions onto U. lactuca. Isotherm curves obtained during Pr(III) biosorption at different pH conditions were concave and favourable with highest experimental uptake of 0.456 mmol/g. According to the Langmuir model, the maximum Pr(III) uptake of 0.495 mmol/g was observed at pH 5 and temperature of 32±1 oC. Apart from the Langmuir model, Pr(III) biosorption isotherms were described using the Freundlich,
Jovanovic, Redlich-Peterson, Sips, Toth, Khan, Radke-Prausnitz, Fritz-Schlunder three parameter, Hill, Koble-Corrigan, Baudu, Weber-van Vliet and Fritz-Schlunder five parameter models were employed. The models were evaluated on the basis of correlation coefficient, % error, root mean square error and chi-square values.
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Regulation of tissue specific gene expression of toll-like receptor 18 (TLR18) mRNA in freshwater shark Pangasius pangasius experimentally induced with Poly I:C

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 18-22, October 2015

Uma Arumugam, G. Rebecca, K. Jawahar Raj, Jesu Arockiaraj


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ABSTRACT

Toll-like receptors (TLRs) are important components of innate immune system that are involved in the recognition of pathogens and activation of immune system. In this study, we have reported the expression profile of TLR18 from pangasius catfish, Pangasius pangasius (designated as PpTLR18) inducted with poly I:C, a synthetic viral ligand. Quantitative real-time PCR analysis was performed to study the expression of PpTLR18 in skin, gill, liver, intestine, kidney, spleen, brain and muscle tissues of P. pangasius. The results showed no significant changes in the expression levels of PpTLR18 gene in skin and intestine. Significant (P < 0.05) up-regulation of PpTLR18 was observed in gill, liver and kidney at 24, 48 and 24 h post injection (p.i.) respectively, whereas the expression was significantly (P < 0.05) down-regulated in brain (24 h and 48 h p.i.), spleen (8 h p.i.) and muscle (24 h p.i.).This result supplies the basic information for further expansion concerning transduction analysis of pathogen associated indications into the defense related tissues and cells of P. pangasius. Further studies have to be conducted to understand the signaling pathways involved in the TLR18-specific recognition of its ligand.


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Immobilization of Saccharomyces cerevisiae on low-cost lignocellulosic substrate for the removal of Cd2+ from aquatic systems

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 23-29, October 2015

Vasileios A. Anagnostopoulos, Athina Vlachou, Basil D. Symeopoulos


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ABSTRACT

Cadmium in aquatic system poses several ecological and health threats. Bioremediation techniques can offer an efficient strategy for the removal of cadmium from aquatic systems. The present study explores the potential of a common yeast (Saccharomyces cerevisiae) immobilized on delignified cellulosic substrate (beech sawdust) for removal of cadmium from acidic effluents. The proposed biosorbent exhibits satisfactory Cd(II) removal over a wide pH range. At the initial cadmium concentration of 8 - 100 mg/L, the Cd(II) removal efficiency varied from 18 to 28%. The Langmuir, Freundlich and Linear isotherm models were tested for the present system. Of these models, the Linear and Freundlich models provided the highest correlation with the experimental data, whereas Langmuir model provided least satisfactory fit.


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Removal of a basic dye from aqueous solution by Gracilaria corticata

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 30-36, October 2015

J. Vijayaraghavan, T. Bhagavathi Pushpa, S. J. Sardhar Basha, J. Jegan


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ABSTRACT

The potential of Gracilaria corticata towards the removal of crystal violet from aqueous solution was examined. The biosorption of crystal violet with respect to pH, biosorbent dosage and initial dye concentrations were studied. The maximum biosorption was recorded at pH 8, 5 g/L biosorbent dosage and 1000 mg/L initial dye concentration. The equilibrium isotherms were described using the Langmuir, Freundlich, Redlich-Peterson, Toth and Sips adsorption models. According to the Langmuir model, G. corticata exhibited biosorption capacity of 193 mg/g for crystal violet. Scanning electron microscopy pictures and Fourier-transform infrared spectroscopy confirmed the dye biosorption mechanism as electrostatic interaction between the negatively charged seaweed surface and positively charged crystal violet. The results obtained in this study clearly indicated that G. corticata was an effective adsorbent for the removal of crystal violet from aqueous solution.
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Bioreduction of hexavalent chromium by Hypocrea tawa in a concentric draft-tube airlift bioreactor

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 37-44, October 2015

Liliana Morales-Barrera, Eliseo Cristiani-Urbina


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ABSTRACT

A fungal strain (Hypocrea tawa) was batch-cultivated in a concentric draft-tube airlift bioreactor to evaluate its potential to reduce highly toxic and water-soluble hexavalent chromium [Cr(VI)] to much less toxic and less mobile trivalent chromium [Cr(III)]. H. tawa exhibited a remarkable capacity to reduce very high Cr(VI) concentrations (4.54 mM) (overall efficiency of Cr(VI) reduction = 100%) completely under aerobic conditions. Furthermore, high volumetric and specific rates of Cr(VI) reduction were attained in the airlift bioreactor. The performance characteristics of H. tawa for Cr(VI) reduction in a concentric draft-tube airlift bioreactor indicate that this fungal strain may have potential applications related to the detoxification of Cr(VI)-contaminated wastewaters.
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Polypyrrole-A conducting nanopolymer for the treatment of simulated textile effluent

Journal of Environment & Biotechnology Research, Vol. 1, No. 1, Pages 45-51, October 2015

V. Janaki, K. Shanthi, S. Kamala-Kannan


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ABSTRACT

The aim of the study was to synthesize polypyrrole (PPy) nanopolymers and to evaluate its potential for the decolorization of simulated textile effluent. PPy nanopolymer was prepared by in vitro chemical oxidative polymerization of pyrrole monomer using ammonium peroxydisulfate as oxidant. Scanning electron microscopy image showed that the nanopolymer was irregular in shape and mostly present in aggregates. The size of the nanopolymer varied from 40 to 80 nm. Fourier transform infrared spectroscopy study showed the characteristic peaks of PPy from 1308 to 681 cm-1 with different vibrational modes. X-ray diffractogram indicates the amorphous nature of the nanopolymer. Batch experiments were carried out as a function of contact time and pH. The PPy nanopolymer decolorized 80% of the dyes that were present in the simulated reactive dye effluent. The equilibrium adsorption data followed the modified Freundlich model and modified pseudo-first-order kinetics. The results of the study indicate that the PPy nanopolymer could be used for the treatment of textile effluents.
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Previous Issue
Journal of Environment and Biotechnology Research
Volume 1, Number 1, Pages 1-51 (October 2015)

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