https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50091 Wed 28 Feb 2024 15:34:08 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47672 Wed 28 Feb 2024 15:21:16 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54317 Wed 28 Feb 2024 15:03:22 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41151 Wed 28 Feb 2024 14:56:22 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46301 −1 lamb meat, and 0.28 pg g(⁻¹-2.75 ng g⁻¹ bovine meat), heavy metals (0.5–33.0 mg kg⁻¹ lettuce), organochlorine pesticides (11–199 μg g⁻¹ carrots), cyclodienes, hexachlorocyclohexanes, hexabromocyclododecane (2–3 times higher than in conventionally produced porcine meat), hexachlorobenzene (1.38–14.49 ng g⁻¹ fat in milk), and non-brominated flame retardants (1.3–3.2 times higher than in conventional produce of greenhouse-grown tomato and cucumber). Moreover, some pollutants like per- and polyfluoroalkyl substances with a longer half-life (1.50–9.10 yrs) are reported to occur in several organic products. In fact, several legacy persistent organic pollutants are known for their significant trophic magnification in an urban terrestrial ecosystem. In addition, many plant functionalities are adversely affected in organic farming. Therefore, the long-term usage of organic products containing such pollutants poses a significant threat to human health. The major limitation in organic livestock production is the severe shortage of organic feed. Several variable standards and technical regulations set by the government and private agencies are the major obstacles in the global marketing of organic products. The present review critically addresses the impact of organic farming on hidden risks due to the use of composts as the amendment resources that enhance the phytoaccumulation and trophic transfer of pollutants, the functional diversity of the ecosystems, and poor harmonization among the policies and regulations in different countries for organic farming. The future directions of research have been suggested to mitigate unintended flows of pollutants into the organic products.]]> Wed 28 Feb 2024 14:51:33 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41138 5 ng g⁻¹), its detection in nearly all foodstuffs (max. concentration of ∼30–300 ng g⁻¹ or ng L⁻¹), human body burden, and toxicological properties as revealed by meta-analysis make TCEP hard to distinguish from traditional FRs, and this situation requires researchers to rethink whether or not TCEP is an appropriate choice as a new FR. However, there are many unresolved issues, which may impede global health agencies in framing stringent regulations and manufacturers considering the meticulous use of TCEP. Therefore, the aim of the present review is to highlight the factors that influence TCEP emissions from its sources, its bioaccessibility, threat of trophic transfer, and toxicogenomics in order to provide better insight into its emergence as an FR. Finally, remediation strategies for dealing with TCEP emissions, and future research directions are addressed.]]> Wed 27 Jul 2022 13:30:29 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38581 Wed 23 Feb 2022 15:53:14 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43200 Wed 22 Mar 2023 10:38:47 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55745 Wed 19 Jun 2024 15:38:25 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55746 300% after 1 week) under mixotrophic conditions. While transitioning to the second week, there was a change in growth pattern, with >600% increase in chlorophyll content and minor pH alterations, indicating the phenotypic response to the synergistic effect of nutritional mode during wastewater treatment. Both the strains showed a similar removal (70–80%) of both organic and inorganic carbon present in the wastewater, while the removal of nitrogen and phosphate (80–90%) was significant during mixotrophy. Metabolic analysis revealed the prominence of key pathways such as CO2 fixation, nitrogen assimilation, and amino acid metabolism under mixotrophic conditions of an open system. Especially, strain MAS1 exhibited elevated expression of organic acids, suggesting their crucial role in nutrient uptake from winery effluents during mixotrophy. Thus, our study demonstrates that a synergy of wastewater environment and nutritional mode enhances phenotypic trait expression in microalgae to improve metabolic flexibility and sustainable biomass production.]]> Wed 19 Jun 2024 15:37:26 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44477 Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, were assessed for their ability in iron (Fe) removal from an AMD sample in nonimmobilized and immobilized systems. Use of free and immobilized cells exhibited 46−48% and 65−79% Fe removal, respectively, after 48 h of incubation. Compared with free cells, immobilized cells exhibited no apparent changes in morphology and granularity, as revealed by flow cytometry analysis, after their exposure to AMD samples. The second derivative spectra from Fourier transform infrared spectroscopy showed vibrational stretching for proteins and hydroxyl groups in immobilized cells. Thus, the immobilization technology offers a protective mechanism in acid-adapted strains against Fe present in AMD samples. Analysis of the immobilized acid-adapted microalgal technology by life cycle assessment (LCA) revealed its environmental sustainability because of less contribution to global warming and limited fossil fuel consumption. We demonstrated that the immobilized acid-adapted microalgal technology is much superior to calcined eggshell−microalgal or conventional limestone systems indicated in the literature for AMD treatment. Thus, this is the first study describing the potential application of microalgal cells entrapped in alginate beads in a greener and economical approach to treat AMD for sustainable mining.]]> Wed 07 Feb 2024 16:37:48 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48292 90%) to the overall emergy and were much lower than in passive and active treatment systems. The microalgal treatment required 2–15 times more renewable inputs than the other two treatment systems. Additionally, the emergy indices indicated higher environmental loading ratio and lower per cent renewability, suggesting the need for adequate renewable inputs in the immobilized microalgal system. The emergy yield ratio for biodiesel production from the microalgal biomass after AMD treatment was >1.0, which indicates a better emergy return on total emergy spent. Based on greenhouse gas emissions, carbon footprint analysis (CFA), was performed using default emission factors, in accordance with the IPCC standards and the National Greenhouse Energy Reporting (NGER) program of Australia. Interestingly, CFA of acid-adapted microalgal technology revealed significant greenhouse gas emissions due to usage of various construction materials as per IPCC, while SCOPE 2 emissions from purchased electricity were evident as per NGER. Our findings indicate that the immobilized microalgal technology is highly sustainable in AMD treatment, and its potential could be realized further by including solar energy into the overall treatment system.]]> Wed 07 Feb 2024 14:55:19 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52578 50% and enhance valorization of residual biomass for value-added products compared to open loop approach. Integrating solar technologies in closed loop system further reduces GHG emissions by 99% and aligns with 11 UN sustainable development goals, making it a suitable model for a zero-waste and low-carbon circular bioeconomy.]]> Wed 07 Feb 2024 14:41:00 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37008 Wed 05 Aug 2020 14:09:13 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30369 -1 dyes at wide ranging pH (2–10). Adsorption equilibriums were attained within 3 h. Sorbent (5 g L^-1) adsorption capacity was 109.43, 115.92 and 111.85 mg g^-1 for MB, AO and MG, respectively. Adsorption kinetics was described using pseudo-second-order model. Equilibrium adsorption data were interpreted by Langmuir and Freundlich isotherms. Dye removal was by coagulation-coupled adsorption. Coagulation was due to the formation of complexes between the dye molecules and OP polyphenols that led to the deposition of precipitated flocs.]]> Wed 04 Sep 2019 09:54:36 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30371 Wed 04 Sep 2019 09:54:34 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30777 Wed 02 Mar 2022 14:25:53 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54546 Tue 27 Feb 2024 20:42:03 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54438 Tue 27 Feb 2024 13:56:17 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50961 Tue 22 Aug 2023 11:24:20 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32556 Tue 19 Jun 2018 11:56:29 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32559 Tue 19 Jun 2018 11:56:22 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32558 Tue 19 Jun 2018 11:56:15 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37098 Tue 18 Aug 2020 09:48:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47398 Tue 17 Jan 2023 11:21:30 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55146 Tue 16 Apr 2024 15:15:23 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51611 92%), PO43−-P (>89%) and COD (>84%) as well as increased production of ROS and neutral lipids, indicating their significant mutualistic interactions with the native bacterial communities for efficient bioremediation of wastewaters. Analysis of 16S rRNA gene-based community data in wastewaters revealed selective enrichment of Firmicutes and Actinobacteria, resulting in enhanced microalgal growth and nutrient removal. The findings of this novel study suggest that microalgal–bacterial co-cultures mediate interspecies interactions for a shift in population dynamics of the indigenous bacteria in wastewaters to facilitate enhanced bioremediation of effluents with sustainable production of biomass and biodiesel.]]> Tue 12 Sep 2023 13:42:26 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44296 1.5-fold). Strain MAS1 grown at pH 3.5 showed a reduction (1.5-fold) in carbohydrates while strain MAS3 exhibited a 17-fold increase in carbohydrates as compared to their growth at pH 6.7. However, lower levels of biologically excess concentrations of the selected transition metals at pH 6.7 unveiled positive or no effect on physiology and biochemistry in microalgal strains, whereas growth with higher metal concentrations at this pH resulted in decreased chlorophyll content. Although the bioavailability of free-metal ions is higher at pH 3.5, as revealed by Visual MINTEQ model, no adverse effect was observed on chlorophyll content in cells grown at pH 3.5 than at pH 6.7. Furthermore, increasing concentrations of Fe, Mn and Zn significantly upregulated the carbohydrate metabolism, but not protein and lipid synthesis, in both strains at pH 3.5 as compared to their growth at pH 6.7. Overall, the impact of pH 3.5 on growth response suggested that acclimation of microalgal strains to acidic pH alleviates metal toxicity by triggering physiological and biochemical changes in microalgae for their survival.]]> Tue 11 Oct 2022 16:05:47 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39314 Variovorax paradoxus IS1, all isolated from wastewaters. Tetradesmus obliquus IS2 and Coelastrella sp. IS3 were further selected for gaining insights into physiological changes, including those of metabolomes in consortia involving V. paradoxus IS1. The distinct parameters investigated were pigments (chlorophyll a, b, and carotenoids), reactive oxygen species (ROS), lipids and metabolites that are implicated in major metabolic pathways. There was a significant increase (>1.2-fold) in pigments, viz., chlorophyll a, b and carotenoids, decrease in ROS and an enhanced lipid yield (>2-fold) in consortia than in individual cultures. In addition, the differential regulation of cellular metabolites such as sugars, amino acids, organic acids and phytohormones was distinct among the two microalgal-bacterial consortia. Our results thus indicate that the selected microalgal strains, T. obliquus IS2 and Coelastrella sp. IS3, developed efficient consortia with V. paradoxus IS1 by effecting the required physiological changes, including metabolomics. Such microalgal-bacterial consortia could largely be used in wastewater treatment and for production of value-added metabolites.]]> Tue 09 Aug 2022 14:26:20 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45300 Thu 27 Oct 2022 09:05:37 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24104 Thu 21 Oct 2021 12:52:12 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37155 Thu 21 Oct 2021 12:44:49 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38732 Thu 20 Jan 2022 14:25:03 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32271 -1 soil). Both the bacterial strains exhibited a great potential in remediating weathered hydrocarbons of engine oil. Addition of inorganic fertilizers (NPK), at recommended levels for bioremediation, resulted in significant inhibition in biostimulation/enhanced natural attenuation as well as bioaugmentation. The data on dehydrogenase activity clearly confirmed those of bioremediation strategies used, indicating that this enzyme assay could serve as an indicator of bioremediation potential of oil-contaminated soil. Extraction of TPHs from engine oil-contaminated soil with hydroxypropyl-ß-cyclodextrin (HPCD), but not 1-butanol, was found reliable in predicting the bioavailability of weathered hydrocarbons. Also, 454 pyrosequencing data were in accordance with those of bioremediation strategies used in the present microcosm study, suggesting the possible use of pyrosequencing in designing approaches for bioremediation.]]> Thu 17 May 2018 13:51:27 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50864 Thu 17 Aug 2023 11:28:32 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48429 Thu 16 Mar 2023 14:18:03 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40072 500 kilotons of PBDEs still exist globally. Both ‘environmental persistence’ and ‘bioaccumulation tendencies’ are the hallmarks of PBDE toxicities; however, both these issues concerning household emissions of PBDEs have been least addressed theoretically or practically. Critical physiological functions, lipophilicity and toxicity, trophic transfer and tissue specificities are of utmost importance in the benefit/risk assessments of PBDEs. Since indoor debromination of deca-BDE often yields many products, a better understanding on their sorption propensity, environmental fate and human toxicities is critical in taking rigorous measures on the ever-growing global deca-BDE market. The data available in the literature on human toxicities of PBDEs have been validated following meta-analysis. In this direction, the intent of the present review was to provide a critical evaluation of the key aspects like compositional patterns/isomer ratios of PBDEs implicated in bioaccumulation, indoor PBDE emissions versus human exposure, secured technologies to deal with the toxic emissions, and human toxicity of PBDEs in relation to the number of bromine atoms. Finally, an emphasis has been made on the knowledge gaps and future research directions related to endurable flame retardants which could fit well into the benefit/risk strategy.]]> Thu 14 Jul 2022 13:53:13 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31931 Thu 14 Apr 2022 10:58:46 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50083 Thu 13 Jul 2023 10:43:20 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50088  twofold) than ammonium, while the bacterial strain cultured with ammonium alone exhibited a > 1.3-fold increase in growth than nitrate. Co-culturing performed higher growth at combined nitrate and ammonium supply as compared to the single cultures. The same ratio of nitrate and ammonium resulted in superior growth of microalgae (> 1.7-fold) and the bacterium (> 4.1-fold) as compared to the monocultures. Uptake of NO3–N, NH4–N and PO4–P by monocultures or co-cultures depended on the ratio of two inorganic nitrogen sources used. The composition of organic acids, amino acids and simple sugars in exudates from monocultures varied with the ratios of nitrate and ammonium in the medium. Thus, the present novel study demonstrates that the release of exudates is affected both qualitatively and quantitatively during mutualistic interactions in microalgal‒bacterial co-cultures under the impact of inorganic nitrogen sources. Our results suggest that the variables such as inorganic nitrogen sources and extracellular metabolites released need to be considered while using co-cultures for effective bioremediation of wastewaters.]]> Thu 13 Jul 2023 10:13:24 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30372 Thu 03 Feb 2022 12:19:08 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49212 Sun 07 May 2023 09:30:32 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29332 Sat 24 Mar 2018 07:34:22 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30283 Sat 24 Mar 2018 07:33:33 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29623 Zn (37.3%) > Cu (15.4%) > Pb (1.7%) and is consistent to earlier findings. There was no significant correlation between litter samples and concentration of metals in worm tissue. However, the bioavailability percent for copper in all samples are dominant except for Acacia pycnantha leaf litter being the lowest 90.9%. Earthworm reproduction test revealed that even with a high copper concentration in all samples, Eucalyptus camaldulensis litter produced the highest juvenile count (160%). Evidently, earthworms are seen to reproduce well even in contaminated litter irrespective of level of metal content. Our findings suggest that there are various risks associated with metal transfer and pollution through plant and animal litter in ecosystem and should be appropriately managed.]]> Sat 24 Mar 2018 07:32:13 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24802 -1 was 119.05, 126.8, 116.28 and 94.34 mg g^-1 for MB, AO, MG and EB, respectively. The water extract obtained from the plant material induced fast decolourization of both categories of dyes followed by gradual flocculation, indicating its potential as a natural coagulant. Gas chromatographic analysis also indicated that the main electrostatic attraction between 1,8-cineole, 1-p-methene-8-thiol and furfural compounds of the biomaterial, and dye molecules resulted in the formation of initial supramolecular complexes which further progressed into strong aggregates, leading to precipitation of dye-biomaterial complexes. Subsequently, the overall complex mechanism of dye removal was confirmed to be a combined process of adsorption and coagulation. Consistent with the batch studies, using selected plant material in real environmental water samples also resulted in effective dye removal, highlighting its potential for use in wastewater treatment.]]> Sat 24 Mar 2018 07:15:14 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24876 Chlorella sp. MM3, to unused or used engine oil, or their water accommodated fractions (WAFs) to determine growth inhibition and response of antioxidant enzymes. Oil type and oil concentration greatly affected the microalgal growth. Used oil at 0.04% (0.4g L^-1) resulted in 50% inhibition in algal growth, measured in terms of chlorophyll-a, while the corresponding concentration of unused oil was nontoxic. Similarly, used oil WAF showed significant toxicity to the algal growth at 10% level, whereas WAF from unused oil was nontoxic even at 100% concentration. Peroxidase enzyme in the microalga significantly increased with used oil at concentrations above 0.04g L^-1 whereas the induction of superoxide dismutase and catalase was apparent only at 0.06g L^-1. Activities of the antioxidant enzymes increased significantly when the microalga was exposed to 75 and 100% WAF obtained from used oil. The used oil toxicity on microalga could be due to the presence of toxic soluble mono- and polyaromatic compounds, heavy metals, and other compounds attained by the oil during its use in the motor engines.]]> Sat 24 Mar 2018 07:14:56 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24925 Alphaproteobacteria persist relatively more in the real contaminated sites compared to Gram +ves, (2) Gram +ves are not always resistant to heavy metal toxicity, (3) Stenotrophomonas followed by Burkholderia and Pseudomonas are the dominant genera of PAH degraders with high metabolic activity in long-term contaminated soils, (4) Actinobacteria is the predominant group among the Gram +ves in soils contaminated with high molecular weight PAHs that co-exist with toxic heavy metals like Pb, Cu and Zn, (5) Microbial communities are nutrient-driven in natural environments and (6) Catabolically potential Gram +/-ves with diverse applicability to remediate the real contaminated sites evolve eventually in the historically-polluted soils. Thus, the most promising indigenous Gram +/-ve strains from the long-term contaminated sites with increased catabolic potential, enzymatic activity and metal tolerance need to be harnessed for mixed contaminant cleanups.]]> Sat 24 Mar 2018 07:14:19 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24516 Quercus robur) acorn peel (OP), to remove toxic Cr(VI) from aqueous solutions was studied in a batch system as a function of contact time, adsorbate concentration, adsorbent dosage, and pH. In an equilibrium time of 420 min, the maximum Cr removal by OP at pH 2 and 10 was 100 and 97 %, respectively. The sorption data fitted well with Langmuir adsorption model. Evaluation using Langmuir expression presented a monolayer sorption capacity of 47.39 mg g^-1 with an equilibrium sorbent dose of 5 g L^-1 and pH 7. Uptake of Cr by OP was described by pseudo-second-order chemisorption model. ICP-OES, LC-ICPMS analysis of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal is by 'integrated adsorption and reduction' mechanism. ESEM-EDX and XRD analysis of OP before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to less toxic Cr³⁺ forms followed by complexation onto the adsorbent surface contributed to the removal of Cr(VI). Consistent with batch studies, OP effectively removed (>95 %) Cr from the real water samples collected from lake and sea. The results of this study illustrate that OP could be an economical, green, and effective biomaterial for Cr(VI) removal from natural aquatic ecosystems and industrial effluents.]]> Sat 24 Mar 2018 07:13:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24707 Melaleuca diosmifolia, fallen off from the plant, to detoxify and remove hexavalent chromium or Cr(VI) from aqueous systems. Initial characterization by gas chromatography revealed that the selected biomaterial is one of the natural sources of eucalyptol. It constituted high concentrations of reducing compounds (iron, phenols and flavonoids). Batch studies revealed that the biosorbent (5 g L^-1) was able to remove 97-99.9% of 250 mg L-1 Cr(VI) at wide-ranging pH (2-10) and temperature (24-48 °C). Adsorption kinetics was well described using the pseudo-second-order kinetic model, while the equilibrium adsorption data were interpreted in terms of the Langmuir isotherm model. The monolayer adsorption capacity was 62.5 mg g^-1. Both inductively coupled plasma optical emission spectrometry and liquid chromatography analyses of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal was 'adsorption-coupled reduction'. Scanning electron microscope, infrared spectroscopy and X-ray diffraction analyses of the biosorbent before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to Cr(III) followed by complexation onto functional groups of the active surface contributed to the removal of Cr(VI) from aqueous solution. The selected biomaterial effectively (99.9%) removed Cr(VI) in lake and sea water samples, highlighting its potential for remediating Cr(VI) in real environmental conditions.]]> Sat 24 Mar 2018 07:11:05 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55796 Sat 22 Jun 2024 12:47:32 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52264 Sat 07 Oct 2023 12:46:52 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45777 200%) in the release of exopolysaccharides that facilitated soil aggregate stability. The increase in soil pH was about one unit (from 4.8 to 5.6 in soil A or 4.3–5.3 in soil B) under the influence of individual or co-cultures of the microalgal strains after 90 days. Algalized acid soils exhibited a significant increase in carbon content (29–57%), dehydrogenase activity (>500%) and production of indole acetic acid (200–500%). Thus, the present study reports for the first time on the great potential of green microalgae in amelioration of acid soils besides improving soil health and fertility.]]> Sat 05 Nov 2022 12:27:56 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50626 100%) for children and HQ > 1 for both children and adults, suggesting their potential acute and chronic health hazards. The present study, for the first time, provides health awareness about the consumption of pesticide-contaminated leafy vegetables grown in urban backyard garden soils.]]> Mon 31 Jul 2023 15:31:30 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51982 Mon 25 Sep 2023 13:54:41 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44755 Mon 24 Oct 2022 08:42:50 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37161 Mon 24 Aug 2020 16:04:57 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37160 Mon 24 Aug 2020 15:57:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37158 Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, isolated from neutral environments, for simultaneous removal of heavy metals such as copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn), and production of biodiesel when grown at pH 3.5. Excepting Cu, the selected metals at concentrations of 10–20 mg L⁻¹ supported good growth of both the strains. Cellular analysis for metal removal revealed the predominance of intracellular mechanism in both the strains resulting in 40–80 and 40–60% removal of Fe and Mn, respectively. In-situ transesterification of biomass indicated enhanced biodiesel yield with increasing concentrations of metals suggesting that both these acid-tolerant microalgae may be the suitable candidates for simultaneous remediation, and sustainable biomass and biodiesel production in environments like metal-rich acid mine drainages.]]> Mon 24 Aug 2020 15:43:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37157 Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, originally isolated from non-acidophilic environment, were tested for their ability to withstand higher concentrations of an invasive heavy metal, cadmium (Cd), at an acidic pH of 3.5 and produce biomass rich in biodiesel. The growth analysis, in terms of chlorophyll, revealed that strain MAS1 was tolerant even to 20 mg L^-1 of Cd while strain MAS3 could withstand only up to 5 mg L^-1. When grown in the presence of 2 mg L^-1, a concentration which is 400-fold higher than that usually occurs in the environment, the microalgal strains accumulated >58% of Cd from culture medium at pH 3.5. FTIR analysis of Cd-laden biomass indicated production of significant amounts of biodiesel rich in fatty acid esters. This is the first study that demonstrates the capability of acid-tolerant microalgae to grow well and remove Cd at acidic pH.]]> Mon 24 Aug 2020 15:36:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37154 Desmodesmusv sp. MAS1 and Heterochlorella sp. MAS3, grown in synthetic acid mine drainage (SAMD). Virtually, there was no difference in the growth of the strain MAS3 both in Bold's basal medium (control) and SAMD. Using the IC₅₀ level (200 mg L^-1) and a lower concentration (50 mg L^-1) of iron in SAMD, the cell granularity, exopolysaccharide (EPS) secretion, iron recovery, and biodiesel were assessed in both the strains. Both cell granularity and accumulation of EPS were significantly altered under metal stress in SAMD, resulting in an increase in total accumulation of iron. Growth of the microalgal strains in SAMD yielded 12-20% biodiesel, with no traces of heavy metals, from the biomass. The entire amount of iron, accumulated intracellularly, was recovered in the residual biomass. Our results on the ability of the acid-adapted microalgal strains in iron recovery and yield of biodiesel when grown in SAMD indicate that they could be the potential candidates for use in bioremediation of extreme habitats like AMD.]]> Mon 24 Aug 2020 12:48:49 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47550 Mon 23 Jan 2023 12:29:38 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49573 Mon 22 May 2023 09:55:08 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42373 Mon 22 Aug 2022 14:22:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33872 Pseudokirchneriella subcapitata and Chlorella sp. MM3. The toxicity criteria included were: chlorophyll a content as a growth parameter and induction of enzyme activities linked to oxidative stress. Increase in concentrations of diesel or its WAF significantly increased toxicity towards growth, measured in terms of chlorophyll a content in both the algae. Activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) in response to addition of diesel or diesel WAF to the microalgal cultures were dose-dependent. Diesel WAF was more toxic than diesel itself, suggesting that use of WAF may be more relevant for environmental risk assessment of diesel. The overall response of the antioxidant enzymes to toxicants’ stress followed the order: POX≥SOD>CAT. The present study clearly demonstrated the use of SOD, POX and CAT as suitable biomarkers for assessing diesel pollution in aquatic ecosystem.]]> Mon 21 Jan 2019 10:42:50 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40757 Mon 18 Jul 2022 13:54:23 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41866 Mon 15 Aug 2022 09:49:20 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46196 Mon 14 Nov 2022 11:15:57 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37159 Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3 can be acclimated to extreme-acidic pH for sustainable production of biomass and biodiesel. Growth analysis indicated that both the microalgal strains possessed a passive uptake of CO₂ at pH 3.0 with biomass production of 0.25 g dry wt. L⁻¹ in Desmodemus sp. and 0.45 g dry wt. L⁻¹ in Heterochlorella sp.. Flow-cytometry analysis for reactive oxygen species, membrane permeability and neutral-lipids revealed the capabilities of both strains to adapt to the stress imposed by acidic pH. Lipid production was doubled in both the strains when grown at pH 3.0. In-situ transesterification of biomass resulted in 13–15% FAME yield in the selected microalgae, indicating their great potential in biofuel production.]]> Mon 12 Apr 2021 15:05:01 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52351 Mon 09 Oct 2023 15:04:08 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52333 Mon 09 Oct 2023 14:50:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39211 2 = 0.873), oxides of Al (R² = 0.361) and Fe (R² = 0.126), and contents of clay (R² = 0.061) and silt (R² = 0.432) were positively correlated with the distribution coefficient (K_d) of glyphosate, while alkaline pH (R² = −0.389) and sand content (R² = −0.343) negatively correlated with the K_d values. Well-decomposed soil OM, consisting of C–H and Cdouble bondO functional groups, enhanced glyphosate sorption, whereas partially decomposed/undecomposed OM facilitated desorption process. Desorption of glyphosate was favoured in seven of nine selected soils due to adverse hysteresis effects (HI = 0.74–1.0). The higher values of leachability index (0.31–1.0) and groundwater ubiquity score (1.60–3.44) calculated for the urban soils indicated the great leaching potential of glyphosate from soil surface to waterbodies. Use of glyphosate on impermeable surfaces might directly contaminate water sources and affect potability of water, non-target biota, and food safety. The calculated values of cancer risk (10⁻⁸‒10⁻¹²) and hazard quotient (1.47 x 10⁻⁶‒4.12 x 10⁻⁶) suggested that the human exposure to glyphosate-contaminated soils through dermal, ingestion and inhalation pathways might cause negligible or no carcinogenic and non-carcinogenic risks to humans. Therefore, glyphosate should be applied judiciously at recommended concentrations in the urban landscapes, mainly on impervious surfaces, to minimize its health impacts in humans and environment.]]> Fri 27 May 2022 10:34:27 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42580 Fri 26 Aug 2022 08:13:57 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51894 Fri 22 Sep 2023 09:22:31 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54933 SAs (manure: 0.90‒73; soil: 0.20‒48.40) > QNs (manure: nd‒3.60; soil: nd‒1.80) > MLs (manure: nd‒1.50; soil: nd‒0.90). Poultry manure-applied farmlands exhibited the highest antibiotic contamination levels, with total antibiotic concentrations surpassing the ecotoxicological effect trigger value of 100 μg kg−1 set by the Steering Committee of the Veterinary International Committee on Harmonization, highlighting the potential hazard of VAs to the soil ecosystem. The translocation of VAs in vegetables was in the order: leaf > root > fruit, and bioaccumulation of 0.10‒3.90 μg kg−1 was recorded. Notably, the calculated risk quotients of antibiotics in vegetables were ˂1, indicating the negligible risk to human health. Overall, our study unveils a concerning state of VAs pollution in organic farmlands in India that warrants special attention, as it may contribute to the proliferation of antibiotic resistance.]]> Fri 22 Mar 2024 14:33:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54930 Fri 22 Mar 2024 14:32:28 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24877 Fri 22 Apr 2022 10:25:28 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39741 Fri 17 Jun 2022 18:20:04 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41795 Fri 12 Aug 2022 12:24:33 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29737 Fri 08 Sep 2017 17:28:22 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50216 Fri 07 Jul 2023 12:23:35 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33332 Fri 03 Dec 2021 10:34:32 AEDT ]]>