Advertisement

Topics

PubMed Journal Database | Bioresource technology RSS

09:06 EDT 27th May 2019 | BioPortfolio

The US National Library of Medicine and National Institutes of Health manage PubMed.gov which comprises of more than 29 million records, papers, reports for biomedical literature, including MEDLINE, life science and medical journals, articles, reviews, reports and  books.

BioPortfolio aims to cross reference relevant information on published papers, clinical trials and news associated with selected topics - speciality.

For example view all recent relevant publications on Epigenetics and associated publications and clincial trials.

Showing PubMed Articles 1–25 of 3,100+ from Bioresource technology

Pilot-scale composting of typical multiple agricultural wastes: Parameter optimization and mechanisms.

In this work, pilot-scale (100 kg of mixed wastes each time) composting of typical agricultural wastes, including chicken manure, vegetable leaves and rice husks with a mass ratio of 6:3:1, was studied. Effects of thermal phases and transformation time on performance, including moisture, nutrient, and carbon contents and C/N ratios of compost, were investigated. The optimal parameters were 75 ± 5 °C and 18 h; the compost met the requirements of Chinese National Agricultural Organic Fertilizer St...

Enhanced biomass and lipid production of Neochloris oleoabundans under high light conditions by anisotropic nature of light-splitting CaCO crystal.

The aim of this work was to study the anisotropic effect of crystalline CaCO nanoparticles (CN)-driven multiple refraction/scattering from the CN-coated agglomerated cells on the rate of photosynthesis and the product yield under high light conditions in the freshwater microalgae Neochloris oleoabundans. The CN-coating via biomineralization significantly improved the biomass and lipid production of N. oleoabundans during second stage of autotrophic induction by sustaining relatively high rate of photosynthe...

Metabolic engineering of Yarrowia lipolytica for the biosynthesis of crotonic acid.

In this study, Y. lipolytica was engineered to produce crotonic acid via the butanol-forming route. Firstly, the crotonase and 3-hydroxybutyryl-CoA dehydrogenase genes from Clostridium beijerinckii, and the thioesterase gene from Bacteroides thetaiotaomicron were heterologously expressed in Y. lipolytica, the engineered strain LZJ001 accumulated 62.3 ± 4.2 mg/L of crotonic acid. Secondly, the acetyl-CoA acetyltransferase from Saccharomyces cerevisiae was overexpressed, the derived recombinant strain ...

Investigation of thermal conversion characteristics and performance evaluation of co-combustion of pine sawdust and lignite coal using TGA, artificial neural network modeling and likelihood method.

(Co-)combustion of pine sawdust (PS) and lignite coal (LC) were investigated using artificial neural networks (ANN), particle swarm optimization (PSO), and Monte Carlo simulation (MC) as a function of blend ratio, heating rate, and temperature via thermal conversion characteristics. The order of degraded compounds in terms of hemi-cellulosic and lignin-based compounds demonstrated the main oxidation and degradation mechanism of co-combustion of PS and LC. The best prediction (R of 99.99%) was obtained by AN...

Influence of FeONPs amendment on nitrogen conservation and microbial community succession during composting of agricultural waste: Relative contributions of ammonia-oxidizing bacteria and archaea to nitrogen conservation.

Composting amended with iron oxide nanoparticles (FeONPs, α-FeO and FeO NPs) were conducted to study the impacts of FeONPs on nitrogen conservation and microbial community. It was found that amendment of FeONPs, especially α-FeO NPs, reduced total nitrogen (TN) loss, and reserved more NH-N and mineral N. Pearson correlation analysis revealed that decrease of ammonia-oxidizing bacteria (AOB) in FeONPs treatments played more important role than ammonia-oxidizing archaea (AOA) in reserving more NH-N and mine...

Bacterial communities, metabolic functions and resistance genes to antibiotics and metals in two saline seafood wastewater treatment systems.

This study investigated the bacterial communities, metabolic functions, antibiotic resistance genes (ARGs) and metal resistance genes (MRGs) in two alternating anaerobic/aerobic biological filters (A/O-BFs) treating saline seafood wastewater (SSW). Firmicutes was the most abundant phylum in both systems, and halophilic and alkaliphilic bacteria were largely enriched. 15 potential pathogens were obtained. Metabolism was the predominant bacterial function. 49 ARGs and 7 MRGs were detected, and the total abund...

Microbial community assembly in detergent wastewater treatment bioreactors: Influent rather than inoculum source plays a more important role.

In this study, three sequencing batch reactors Ra, Rb, Rc with different inoculum sources (activated sludge; activated sludge plus detergent degrading consortium; detergent degrading consortium) were used to treat detergent wastewater [consisting of sodium dodecyl sulfate, polyoxyethylene lauryl ether and tetrasodium ethylenediamine tetraacetate (NaEDTA)]. Fast start-up and highest performance in phase I and II (organic loading rate were 0.28, 0.39 kgCOD/kgMLSS/d, respectively) were observed in Rc. In contr...

Effect of low-intensity direct current electric field on microbial nitrate removal in coal pyrolysis wastewater with low COD to nitrogen ratio.

The coupling of bioelectrochemical system with the biological denitrification process (R1) was constructed for nitrate removal in coal pyrolysis wastewater (CPW) and the effect of low-intensity direct current electric field was investigated. Compared with control reactor (R2), the total nitrogen (TN) removal efficiency in R1 at the optimized voltage of 0.9 V was 94.20 ± 2.14%, which was 14.42% higher than that in R2. The biofilm on the cathode of R1 enhanced the nitrate reducing, however, nitrite was...

Enhancing hyper-thermophilic hydrolysis pre-treatment of chicken manure for biogas production by in-situ gas phase ammonia stripping.

Hydrolysis is normally the rate limiting step for anaerobic digestion (AD). In this study, hyper-thermophilic (70 °C) pre-treatment of chicken manure under HRTs of 10, 5, 3, 2 and 1 d(s) was investigated to enhance the hydrolysis efficiency for biogas production. In-situ phase gas stripping was integrated into the pre-treatment reactor to remove ammonia-N and to enhance the hydrolysis performance. The results showed that in-situ gas stripping removed 18%-31% of ammonia-N and improved hydrolysis by 2.6%...

Characterization of fluorescent dissolved organic matter from green macroalgae (Ulva prolifera)-derived biochar by excitation-emission matrix combined with parallel factor and self-organizing maps analyses.

This study investigated the effects of various pyrolysis temperatures and extraction salinities on the fluorescence features of DOM from Ulva prolifera-derived biochar under aseptic conditions using fluorescence excitation-emission matrix (EEM) spectroscopy with parallel factor (PARAFAC) analysis and self-organizing maps (SOM). Four humic-like substances and one protein-like substance were identified by the PARAFAC model. The contents and compositions of PARAFAC components depended more on the pyrolysis tem...

Effects of bulking material types on water consumption and pollutant degradation in composting process with controlled addition of different liquid manures.

This study was conducted to examine the effects of different bulking materials (corncob and ricehusk) on liquid manure consumption, organic matter degradation and pollutants retention in composting process under controlled addition of different types of liquid manures (LM). The results indicated that under the controlled addition of LM, bulking materials with higher content of biodegradable carbon (corncob) and LM with a higher concentration of organic pollutants (swine effluent) were more beneficial for bi...

Pyrolysis characteristics of lignocellulosic biomass components in the presence of CaO.

In this study, the reaction mechanism for the pyrolysis of cellulose, hemicellulose and lignin in the presence of CaO was examined using TG-FTIR and PY-GC/MS. Results indicated that, at low temperature (400-600 °C), in addition to HO and CO, acids and phenols from hemicellulose pyrolysis, sugars from cellulose pyrolysis and phenols from lignin pyrolysis would react with CaO. While, at elevated temperature (600 °C-800 °C), the catalytic effect of CaO was more obvious. In detail, in hemicellulose pyr...

Innovative upflow anaerobic sludge osmotic membrane bioreactor for wastewater treatment.

A novel upflow anaerobic sludge-forward osmotic membrane bioreactor was developed for simultaneous wastewater treatment, membrane fouling reduction, and nutrient recovery. An upflow anaerobic sludge blanket (UASB) reactor was incorporated into the system, suspending the anaerobic sludge at the bottom of the reactor. A forward osmosis membrane replaced the traditional three-phase separator of the UASB technology. The removals of chemical oxygen demand, PO, and NH were all more than 95% with low membrane foul...

Biohydrogen and polyhydroxyalkanoate production from original hydrolyzed polyacrylamide-containing wastewater.

This work aimed to study biohydrogen (H) and polyhydroxyalkanoate (PHA) production from original hydrolyzed polyacrylamide (HPAM)-containing wastewater. NH-N from HPAM hydrolysis was removed efficiently through short-cut nitrification and anoxic ammonia oxidation (anammox). Carbon/Nitrogen (C/N) ratios of effluent reached 51-97, and TOC decreased only 2%-4%, providing potential for subsequent H and PHA production. The maximum yields of H (0.833 mL·mg) and Volatile Fatty Acid (VFA) (465 mg·L) occurred ...

Combination of multi-enzyme expression fine-tuning and co-substrates addition improves phenyllactic acid production with an Escherichia coli whole-cell biocatalyst.

The aim of this study was to develop an environmentally safe and efficient method for phenyllactic acid (PLA) production using whole-cell cascade catalysis with l-amino acid deaminase (l-AAD), lactate dehydrogenase (LDH), and formate dehydrogenase (FDH). The PPA titer was low due to relatively low expression of LDH, intermediate accumulation, and lack of cofactors. To address this issue, ribosome binding site regulation, gene duplication, and induction optimization were performed to increased the PLA titer ...

Use of anaerobic co-digestion as an alternative to add value to sugarcane biorefinery wastes.

In this study the anaerobic co-digestion (AcD) of sugarcane biorefinery by-products, i.e. hemicelluloses hydrolysate (HH) (obtained by hydrothermal pretreatment of sugarcane bagasse), vinasse, yeast extract (YE) and sugarcane bagasse fly ashes (SBFA), was optimized by means of biochemical methane potential experiments. The best experimental conditions of AcD (25-75% HH-to-vinasse mixture ratio; 1.0 g L YE; 15 g L SBFA and 100-0% HH-to-Vinasse; 1.5 g L YE; 45 g L SBFA) led to the production o...

Thermal conversion of pineapple crown leaf waste to magnetized activated carbon for dye removal.

Pineapple crown leaf was successfully converted to the magnetized activated carbon (MAC) as an attractive solution to overcome separation problems. The activated carbon (AC) was produced by an innovative method combining KOH activation and microwave heating while the magnetization process was prepared by a co-precipitation method. In this sense, the activation stage was studied at different impregnation ratio. The resulted magnetic adsorbent was further tested its feasibility for methyl violet dye removal. ...

Nonlinear estimation and control schemes for a complex anaerobic digestion of microalgae with unknown kinetics and inputs.

This work addresses estimation and advanced control schemes for a complex microalgae anaerobic digestion process, used for wastewater treatment as well as for converting organic waste and biomass into biogas. The control goal is to keep the inhibitory compounds at imposed low levels despite the influent pollutant concentration and load variations. The proposed innovative control schemes work in accurate operating conditions and can cope with harsh assumptions: unknown kinetic rates, unknown feed-in pollutan...

Enhancing microbial community performance on acid resistance by modified adaptive laboratory evolution.

A new strategy of three-step adaptive laboratory evolution (ALE) was developed to enhance the bioleaching performance of moderately thermophilic consortia. Through consortium construction, directed evolution and chemostat selection, an improved consortium (ALEend) that composed of Leptospirillum ferriphilum (80.32%), Sulfobacillus thermosulfidooxidans (15.82%) and Ferroplasma thermophilum (3.86%) was obtained, showing ferrous iron oxidation rate of 500 mgLh and biomass production of 2.0 × 10 cells/...

Green alga cultivation with nanofibers as physical adsorbents of carbon dioxide: Evaluation of gas biofixation and macromolecule production.

The objective of this study was to evaluate the biofixation and production of biocompounds by Chlorella fusca LEB 111 cultivated with different concentrations of carbon dioxide (CO) adsorbent nanofibers in their free form or retained. Cultures were grown in 15% (v v) CO with 0.1, 0.3 and 0.5 g L nanofibers developed with 10% (w v) polyacrylonitrile (PAN)/dimethylformamide (DMF), with or without nanoparticles; retained or not. The addition of 0.1 g L nanofibers with nanoparticles in their free fo...

Effects of ferric oxide on the microbial community and functioning during anaerobic digestion of swine manure.

Iron-based materials have been suggested as environmentally-friendly additives that can enhance methane production during anaerobic digestion (AD). In this study, the effects of ferric oxide (FeO) addition on methane production were investigated during swine manure AD. In addition, the effects of FeO addition on the AD ternary pH buffer system and microbial community were evaluated. FeO could improve the accumulative methane production by maximum 11.06% when adding 75 mmol of FeO. Higher methane productio...

Temporal bacterial community succession during the start-up process of biofilters in a cold-freshwater recirculating aquaculture system.

Start-up of biofilters plays crucial roles in the successful operation of recirculating aquaculture system, and the nature is bacterial community succession. We explored the pattern of bacterial temporal succession during the start-up process of biofilters in a commercial cold-freshwater recirculating aquaculture system (RAS). The whole succession process was divided into three distinct phases: incubation, growth and stability. Phylogenetic diversity and evenness of the bacterial community increased during ...

Anaerobic digestion performance and microbial community structure of corn stover in three-stage continuously stirred tank reactors.

A new three-stage anaerobic digestion (TSAD) system combining the two-stage and serial continuously stirred tank reactor (CSTR) was developed for the high-efficiency anaerobic digestion (AD) of corn stover. At the same hydraulic retention time of 50 d and organic loading rate (OLR) of 1.8 g TS L d, TSAD achieved a 33.2-50.5% higher methane yield than that of the traditional one-stage and two-stage AD. Moreover, the TSAD process showed higher buffering ability and system stability, relieving the negati...

Simultaneous removal of nitrogen and pharmaceutical and personal care products from the effluent of waste water treatment plants using aerated solid-phase denitrification system.

Nowadays, waste water treatment plants (WWTPs) are regarded as the pollution sources of nitrogen and pharmaceutical and personal care products (PPCPs). In the present study, the simultaneous removal of nitrogen and typical PPCPs, ibuprofen and triclosan, was evaluated in a poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) based solid-phase denitrification (SPD) system. Results after 602 days showed that simultaneous nitrification and denitrification (SND) process occurred with average 83.85 ± 13.09%...

Continuous cultivation of Arthrospira platensis for phycocyanin production in large-scale outdoor raceway ponds using microfiltered culture medium.

In the present study, the effect of filtrating algal culture medium for reuse by using microfiltration membranes on microalgal growth, microbiological contamination, and phycocyanin production of Arthrospira platensis was investigated. Results showed that microfiltered culture medium affected microalgal growth, microbiological contamination, and phycocyanin production of A. platensis significantly. Microfiltered culture medium could enhance biomass production, photosynthesis, and phycocyanin accumulation an...


Advertisement
Quick Search
Advertisement
Advertisement