Search results for: Gunaratna Kuttuva Rajarao

Items from 1 to 14 out of 14 results

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Antifeedants Produced by Bacteria Associated with the Gut of the Pine Weevil Hylobius abietis

Karolin Axelsson, Vera Konstanzer, Gunaratna Kuttuva Rajarao, Olle Terenius, more

Microbial Ecology > 2017 > 74 > 1 > 177-184

The pine weevil, Hylobius abietis, is a severe forest pest insect as it feeds on newly planted conifer seedlings. To identify and develop an antifeedant could be one step towards the protection of seedlings from feeding damage by the pine weevil. With the aim to trace the origin of the antifeedants previously found in feces of the pine weevil, we investigated the culturable bacteria associated with...

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Cedrol, a malaria mosquito oviposition attractant is produced by fungi isolated from rhizomes of the grass Cyperus rotundus

Lynda K. Eneh, Hiromi Saijo, Anna-Karin Borg-Karlson, Jenny M. Lindh, more

Malaria Journal > 2016 > 15 > 1 > 1-4

Background Cedrol, a sesquiterpene alcohol, is the first identified oviposition attractant for African malaria vectors. Finding the natural source of this compound might help to elucidate why Anopheles gambiae and Anopheles arabiensis prefer to lay eggs in habitats containing it. Previous studies suggest that cedrol may be a fungal metabolite and the essential oil of grass rhizomes have been described...

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Chemodiversity and biodiversity of fungi associated with the pine weevil Hylobius abietis

Muhammad Azeem, Olle Terenius, Gunaratna Kuttuva Rajarao, Kazuhiro Nagahama, more

Fungal Biology > 2015 > 119 > 8 > 738-746

The pine weevil Hylobius abietis is a severe pest of conifer seedlings in reforestation areas. Weevils lay eggs in the root bark or in the soil near roots of recently dead trees and cover the eggs with frass (feces combined with chewed bark), possibly to avoid conspecific egg predation. The aim of the present investigation focused on isolation, identification, and volatile production of fungi from...

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A fungal metabolite masks the host plant odor for the pine weevil (Hylobius abietis)

Muhammad Azeem, Gunaratna Kuttuva Rajarao, Olle Terenius, Göran Nordlander, more

Fungal Ecology > 2015 > 13 > C > 103-111

The pine weevil is one of the most important pest insects of conifer reforestation areas in Europe. Female pine weevils cover their eggs with chewed bark and feces (frass) resulting in avoidance behavior of feeding conspecifics towards egg laying sites. It has been suggested that microorganisms present in the frass may be responsible for producing deterrent compounds for the pine weevil. The fungi...

article

Microemulsion prepared magnetic nanoparticles for phosphate removal: Time efficient studies

Ramnath Lakshmanan, Chuka Okoli, Magali Boutonnet, Sven Järås, more

Journal of Environmental Chemical Engineering > 2014 > 2 > 1 > 185-189

The present study investigates the effective removal of phosphate in sewage wastewater using magnetic iron oxide nanoparticles (MION). The microemulsion-prepared magnetic iron oxide nanoparticles (ME-MION) of around 7–10nm was synthesized using water-in-oil microemulsion method. The interaction of ME-MION and phosphate was studied using In situ FT-IR technique. Batch experiments were carried out with...

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Effective water content reduction in sewage wastewater sludge using magnetic nanoparticles

Ramnath Lakshmanan, Gunaratna Kuttuva Rajarao

Bioresource Technology > 2014 > 153 > Complete > 333-339

The present work compares the use of three flocculants for sedimentation of sludge and sludge water content from sewage wastewater i.e. magnetic iron oxide nanoparticles (MION), ferrous sulfate (chemical) and Moringa crude extract (protein). Sludge water content, wet/dry weight, turbidity and color were performed for, time kinetics and large-scale experiment. A 30% reduction of the sludge water content...

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Efficacy of reactive mineral-based sorbents for phosphate, bacteria, nitrogen and TOC removal – Column experiment in recirculation batch mode

Charlotte Nilsson, Ramnath Lakshmanan, Gunno Renman, Gunaratna Kuttuva Rajarao

Water Research > 2013 > 47 > 14 > 5165-5175

Two mineral-based materials (Polonite and Sorbulite) intended for filter wells in on-site wastewater treatment were compared in terms of removal of phosphate (PO₄–P), total inorganic nitrogen (TIN), total organic carbon (TOC) and faecal indicator bacteria (Escherichia coli and Enterococci). Using an innovative, recirculating system, septic tank effluent was pumped at a hydraulic loading rate of 3000 L m...

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Sustainable bio-production of styrene from forest waste

Muhammad Azeem, Anna Karin Borg-Karlson, Gunaratna Kuttuva Rajarao

Bioresource Technology > 2013 > 144 > C > 684-688

A strain of Penicillium expansum was studied for the production of styrene using forest waste biomass as a feeding substrate. The fungal strain was cultivated on bark of various trees supplemented with yeast extract and the volatiles produced were collected on Tenax TA and analyzed by gas chromatography–mass spectrometry. Fungus cultured on grated soft bark of pine (Pinus sylvestris) stems (GPB) and...

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Penicillium expansum Volatiles Reduce Pine Weevil Attraction to Host Plants

Muhammad Azeem, Gunaratna Kuttuva Rajarao, Henrik Nordenhem, Göran Nordlander, more

Journal of Chemical Ecology > 2013 > 39 > 1 > 120-128

The pine weevil Hylobius abietis (L.) is a severe pest of conifer seedlings in reforested areas of Europe and Asia. To identify minimally toxic and ecologically sustainable compounds for protecting newly planted seedlings, we evaluated the volatile metabolites produced by microbes isolated from H. abietis feces and frass. Female weevils deposit feces and chew bark at oviposition sites, presumably...

article

Effective removal of Cu2+ ions from aqueous medium using alginate as biosorbent

Lakhvinder Singh, Asalapuram Ramachandran Pavankumar, Ramnath Lakshmanan, Gunaratna Kuttuva Rajarao

Ecological Engineering > 2012 > 38 > 1 > 119-124

Removal of heavy metals present in the environment is always of high importance in order to balance ecology with healthy life forms. Biosorption of Cu ²⁺ ions from simulated aqueous medium were studied using calcium alginate beads. Experiments were designed and performed according to Box–Behnken matrix of response surface methodology. The effects of four vital operating variables on the metal–ion...

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Influence of microbial interactions and EPS/polysaccharide composition on nutrient removal activity in biofilms formed by strains found in wastewater treatment systems

Sofia Andersson, Gunnel Dalhammar, Gunaratna Kuttuva Rajarao

Microbiological Research > 2011 > 166 > 6 > 449-457

The study of biofilm function, structure and microbial interactions might help to improve our understanding of biofilm wastewater treatment processes. However, few reports specifically address the influence of interactions within multispecies biofilms on microbial activity and biofilm composition. Thus, the relationship between biofilm formation, denitrification activity, phosphorus removal and the...

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Characterization of extracellular polymeric substances from denitrifying organism Comamonas denitrificans

Sofia Andersson, Gunnel Dalhammar, Carl Johan Land, Gunaratna Kuttuva Rajarao

Applied Microbiology and Biotechnology > 2009 > 82 > 3 > 535-543

Extracellular polymeric substances (EPS) play an important role in the formation and activity of biofilms in wastewater treatment (WWT). The EPS of the denitrifying biomarker Comamonas denitrificans strain 110, produced in different culture media and growth modes, were characterized. The EPS mainly contained protein (3–37%), nucleic acids (9–50%), and carbohydrates (3–21%). The extracellular DNA was...

article

The signal peptide NPFSD fused to ricin A chain enhances cell uptake and cytotoxicity in Candida albicans

Gunaratna Kuttuva Rajarao, Natalia Nekhotiaeva, Liam Good

Biochemical and Biophysical Research Communications > 2003 > 301 > 2 > 529-534

Microorganisms possess stringent cell membranes which limit the cellular uptake of antimicrobials. One strategy to overcome these barriers is to attach drugs or research reagents to carrier peptides that enter cells by passive permeation or active uptake. Here the short endocytosis signal peptide NPFSD was found to efficiently deliver both FITC and GFP into Saccharomyces cerevisiae and Candida albicans...

article

Peptide-mediated delivery of green fluorescent protein into yeasts and bacteria

Gunaratna Kuttuva Rajarao, Natalia Nekhotiaeva, Liam Good

FEMS Microbiology Letters > 2002 > 215 > 2 > 267-272

Stringent microbial cell barriers limit the application of many substances in research and therapeutics. Carrier peptides that penetrate or translocate across cell membranes may help overcome this problem. To assess peptide-mediated delivery into two yeast and three bacterial species, a range of cell penetrating and signal peptide sequences were fused to green fluorescent protein (GFP), expressed...

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