526,226 results match your criteria Carbon Letters[Journal]


Induced CO2 Electroreduction to Formic Acid on Metal-Organic Frameworks via Node Doping.

ChemSusChem 2020 Jul 11. Epub 2020 Jul 11.

Shanghai Advanced Research Institute, CAS Key Laboratory of Low-Carbon Vonversion Science and Engineering, 100 Haike Road, 201210, Shanghai, CHINA.

Metal-organic frameworks (MOFs), combining the advantages of heterogeneous and homogeneous components, have been explored as a novel kind of catalytic materials for CO 2 electroreduction reaction (CO 2 ERR). However, the unmatched metal nodes subject MOFs to the lower faradaic efficiency (FE) and limited current density in CO 2 ERR. Herein, we report a general strategy to promote activities of MOFs via node doping in CO 2 ERR. Read More

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http://dx.doi.org/10.1002/cssc.202001310DOI Listing

The response of soil respiration to precipitation change is asymmetric and differs between grasslands and forests.

Glob Chang Biol 2020 Jul 11. Epub 2020 Jul 11.

Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.

Intensification of the Earth's hydrological cycle amplifies the interannual variability of precipitation, which will significantly impact on terrestrial carbon (C) cycle. However, it is still unknown whether previously observed relationship between soil respiration (R ) and precipitation remains applicable under extreme precipitation change. By analyzing the observations from a much larger dataset of field experiments (248 published papers including 151 grassland studies and 97 forest studies) across a wider range of precipitation-manipulation than previous studies, we found that the R response to precipitation change was highly nonlinear or asymmetric, and differed significantly between grasslands and forests, between moderate and extreme precipitation changes. Read More

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http://dx.doi.org/10.1111/gcb.15270DOI Listing

Universal Access to Two-Dimensional Mesoporous Heterostructures via Micelle-Directed Interfacial Assembly.

Angew Chem Int Ed Engl 2020 Jul 11. Epub 2020 Jul 11.

The University of Queensland, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), Saint Lucia, 4072, Brisbane, AUSTRALIA.

Two-dimensional (2D) mesoporous heterostructures combining ultrathin nanosheet morphology, periodic porous surface structures and diverse hybrid compositions have recently emerged and become increasingly important for renewable energy storage and electronics. However, it remains a great challenge to develop a universal method to prepare 2D mesoporous heterostructures. Here, we report a composite micelle-directed interfacial assembly method to synthesize vertical heterostructures with ultrathin 2D material and two surrounding mesoporous monolayers assembled on both sides. Read More

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http://dx.doi.org/10.1002/anie.202007063DOI Listing

Splenectomy enhances the Ly6C phenotype in hepatic macrophages by activating the ERK1/2 pathway during liver fibrosis.

Int Immunopharmacol 2020 Jul 7;86:106762. Epub 2020 Jul 7.

National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China; The Liver and Spleen Diseases Research Center, Xi'an, China; Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education of China, Xi'an, China. Electronic address:

Background And Aim: Splenectomy has been reported to attenuate liver fibrosis. In addition, phenotype transitions of infiltrating macrophages, including Ly6C and Ly6C, play an essential role in the liver fibrosis. However, whether the spleen can regulate the phenotype switch of macrophages and the underlying mechanism still remain unclear. Read More

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http://dx.doi.org/10.1016/j.intimp.2020.106762DOI Listing

Biogeochemical and photobiological responses of subarctic lakes to UV radiation.

J Photochem Photobiol B 2020 Jun 11;209:111932. Epub 2020 Jun 11.

Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, 15140 Lahti, Finland.

Solar ultraviolet radiation (UV) induces photodegradation of optically and functionally important organic compounds in lakes and may negatively impact aquatic biota. We disentangled UV impacts on dissolved organic matter (DOM) transformation, and algal and zoobenthic micro-organisms in two shallow subarctic lakes in NW Finnish Lapland; in a high-UV + low-DOM (tundra, Iso-Jehkas) and a low-UV + high-DOM (mountain birch woodland, Mukkavaara) system. In addition to site and seasonal comparisons, in situ experiments with three treatments (DARK, photosynthetically active radiation [PAR], UV + PAR) were set up floating on the lakes for four weeks during midsummer. Read More

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http://dx.doi.org/10.1016/j.jphotobiol.2020.111932DOI Listing

Design and optimization of bioreactor to boost carbon dioxide assimilation in RuBisCo-equipped Escherichia coli.

Authors:
Shih-I Tan I-Son Ng

Bioresour Technol 2020 Jul 6;314:123785. Epub 2020 Jul 6.

Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan. Electronic address:

Global warming is a surging issue that has provoked the demand of green process to mitigate carbon dioxide. In this context, RuBisCo-equipped Escherichia coli has first developed and evaluated the CO-assimiliable capability based on the mass balance in three devices: Flask-based in CO incubator (FIC), two-layered device (TLD) and CO bubbling device (CBD) systematically. With the forced diffusion of 5% CO in CBD, which confers an efficient attack of CO to RuBisCo, the CO assimilation increased from -5. Read More

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http://dx.doi.org/10.1016/j.biortech.2020.123785DOI Listing

Biochar combined with gypsum reduces both nitrogen and carbon losses during agricultural waste composting and enhances overall compost quality by regulating microbial activities and functions.

Bioresour Technol 2020 Jul 5;314:123781. Epub 2020 Jul 5.

Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, College of Horticulture, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing 100193, China. Electronic address:

Composting is an efficient method for treating agricultural wastes. This study investigated the effects of the addition of biochar (B) and gypsum (G) to straw mixed with chicken manure (SC) (i.e. Read More

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http://dx.doi.org/10.1016/j.biortech.2020.123781DOI Listing

Carbon dioxide capture and use in photobioreactors: The role of the carbon dioxide loads in the carbon footprint.

Bioresour Technol 2020 Jun 26;314:123745. Epub 2020 Jun 26.

Bioprocess Intensification Group, Federal University of Santa Maria, UFSM, Roraima Avenue 1000, 97105-900 Santa Maria, RS, Brazil. Electronic address:

This research evaluated the carbon dioxide capture and use by Scenedesmus obliquus in a photobioreactor under different CO loads. Performance indicators, carbon and energy balances, sustainability indicators, and carbon credits on the photobioreactor were assessed. The results expressed that the CO loads of 384. Read More

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http://dx.doi.org/10.1016/j.biortech.2020.123745DOI Listing

Kinetic and mechanistic investigation into odorant haloanisoles degradation process by peracetic acid combined with UV irradiation.

J Hazard Mater 2020 Jul 1;401:123356. Epub 2020 Jul 1.

School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address:

This study reported the kinetics and mechanism of degradation of odorant haloanisoles by peracetic acid combined with UV irradiation (PAA/UV). The removal efficiency of haloanisoles by PAA/UV was more than 92 % after 1 h reaction at pH 5, 25 °C, [HAs] =50 μg/L and [PAA] = 10 mg/L. The degradation of haloanisoles was fitted by the first-order kinetic model, and the rate constants of various haloanisoles followed the order: 2,4,6-tribromoanisole (2,4,6-TBA, (9. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2020.123356DOI Listing

An efficient broad spectrum-driven carbon and oxygen co-doped g-CN for the photodegradation of endocrine disrupting: Mechanism, degradation pathway, DFT calculation and toluene selective oxidation.

J Hazard Mater 2020 Jun 27;401:123309. Epub 2020 Jun 27.

Institute for Energy Research, Jiangsu University, Zhenjiang 212013, PR China. Electronic address:

In this study, a new type of carbon and oxygen co-doped g-CN (PACN) was successfully synthesized by a one-step thermal polymerization method for the photodegradation of Bisphenol A (BPA) and selective oxidation of toluene to benzaldehyde. The degradation rate of BPA was 23.58 times higher than that of pristine g-CN and the efficiency benzaldehyde formation rate without the need of any solvent increased to 5. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2020.123309DOI Listing

Micropollutants cometabolism of microalgae for wastewater remediation: Effect of carbon sources to cometabolism and degradation products.

Water Res 2020 Jun 17;183:115974. Epub 2020 Jun 17.

Faculty of Environment and Natural Resources, University of Technology, Vietnam National University - Ho Chi Minh, 268 Ly Thuong Kiet st, Dist. 10, Ho Chi Minh City, 700 000, Viet Nam.

This study investigated the impacts of selective sole carbon source-induced micropollutants (MPs) cometabolism of Chlorella sp. by: (i) extracellular polymeric substances (EPS), superoxide dismutase and peroxidase enzyme production; (ii) MPs removal efficiency and cometabolism rate; (iii) MPs' potential degradation products identification; and (iv) degradation pathways and validation using the Eawag database to differentiate the cometabolism of Chlorella sp. with other microbes. Read More

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http://dx.doi.org/10.1016/j.watres.2020.115974DOI Listing

Chlorothalonil transformation products in drinking water resources: Widespread and challenging to abate.

Water Res 2020 Jun 17;183:116066. Epub 2020 Jun 17.

Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092, Zurich, Switzerland. Electronic address:

Chlorothalonil, a fungicide applied for decades worldwide, has recently been banned in the European Union (EU) and Switzerland due to its carcinogenicity and the presence of potentially toxic transformation products (TPs) in groundwater. The spread and concentration range of chlorothalonil TPs in different drinking water resources was examined (73 groundwater and four surface water samples mainly from Switzerland). The chlorothalonil sulfonic acid TPs (R471811, R419492, R417888) occurred more frequently and at higher concentrations (detected in 65-100% of the samples, ≤2200 ngL) than the phenolic TPs (SYN507900, SYN548580, R611968; detected in 10-30% of the samples, ≤130 ngL). Read More

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http://dx.doi.org/10.1016/j.watres.2020.116066DOI Listing

Sealed pre-carbonization to regulate the porosity and heteroatom sites of biomass derived carbons for lithium-sulfur batteries.

J Colloid Interface Sci 2020 Jul 1;579:667-679. Epub 2020 Jul 1.

School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China. Electronic address:

Ultrathin carbon sheets with high surface area, abundant mesoporous structure and rich N, O heteroatom doping sites were prepared from puffed rice through unique sealed pre-carbonization. By utilizing them as cathode materials for lithium-sulfur batteries, the in-operando Raman spectra and electrochemical tests indicated that the polysulfides shuttling effect could be substantially suppressed by the physical confinement and chemical adsorption due to these structural advantages. In addition, the well-developed hierarchical porous structure and ultrathin thickness were found to enhance the mass diffusion in the electrode, which increased the ion conductivity within the carbon framework. Read More

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http://dx.doi.org/10.1016/j.jcis.2020.06.068DOI Listing

CORM-3 improves emotional changes induced by hemorrhagic shock via the inhibition of pyroptosis in the amygdala.

Neurochem Int 2020 Jul 8:104784. Epub 2020 Jul 8.

Department of Anesthesiology, Cangzhou Central Hospital, Cangzhou, China. Electronic address:

Hemorrhagic shock and resuscitation (HSR) may lead to long-term neurological dysfunction, such as depression and anxiety. Carbon monoxide (CO) has emerged as an excellent neuroprotective agent against caspase-1-associated pyroptosis, following HSR. We evaluated the effects and determined the mechanism through which CO protects against emotional changes in a model of HSR, in rats. Read More

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http://dx.doi.org/10.1016/j.neuint.2020.104784DOI Listing

A facile fabrication of dissolving microneedles containing 5-aminolevulinic acid.

Int J Pharm 2020 Jul 8:119554. Epub 2020 Jul 8.

CEA, LETI-DTBS, 17 rue des Martyrs, Grenoble Cedex, France.

Photodynamic therapy induced by protoporphyrin IX (PpIX) is widely used to treat precancerous skin lesions. The penetration depth of the prodrug 5-aminolevulinic acid (5-ALA) using topical application is currently limited, which hampers the production of PpIX in deep seated lesions. To enhance 5-ALA delivery in deep skin layers, a soluble microneedles patch (MN-patch) containing 5-ALA has been successfully developed by using a fast solvent casting molding method which could be easily up-scaled. Read More

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http://dx.doi.org/10.1016/j.ijpharm.2020.119554DOI Listing

Mesoporous biohybrid epichlorohydrin crosslinked chitosan/carbon-clay adsorbent for effective cationic and anionic dyes adsorption.

Int J Biol Macromol 2020 Jul 8. Epub 2020 Jul 8.

Department of Biotechnology, College of Science, University of Diyala, Baqubah, Iraq.

Epichlorohydrin crosslinked chitosan/carbon-clay (CSCC) biohybrid adsorbent was prepared for the adsorption of cationic methylene blue (MB) and anionic azo acid blue 29 (AB 29). The 40:60 wt% of chitosan (CS) and carbon-clay (CC) was selected as the best biohybrid adsorbent (CS40CC60) for the adsorption of both dyes. The adsorption of MB and AB 29 on CS40CC60 was carried out in a batch process to investigate the effects of initial dye concentration (25-400 mg/L), initial pH (3-11), contact time and adsorption temperature (30, 40 and 50 °C). Read More

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http://dx.doi.org/10.1016/j.ijbiomac.2020.07.032DOI Listing

Enhanced adsorption properties of zirconium modified chitosan-zeolite nanocomposites for vanadium ion removal.

Int J Biol Macromol 2020 Jul 8. Epub 2020 Jul 8.

Research Laboratory of Nanoporous Materials, Faculty of Chemistry, Iran University of Science and Technology, Farjam Street, Narmak, P.O. Box 16846-13114, Tehran, Iran. Electronic address:

The novel hybrid adsorbents, which were composed of nanozeolite and nanochitosan (NZ@NCT) and nanozeolite-multi walled carbon nanotube and nanochitosan (CNZ@NCT) were produced by simple method. The adsorption capacity of synthesized nanocomposites towards vanadium (V) was compared with that of a clinoptilolite-nanochitosan nanocomposite (CPL@NCT) obtained from natural zeolite. Zirconium (Zr) was employed to modify prepared nanocomposites because Zr (IV) has a strong affinity towards oxyanions such as V. Read More

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http://dx.doi.org/10.1016/j.ijbiomac.2020.07.055DOI Listing

Are Fatty Acids Gluconeogenic Precursors?

Authors:
Michael H Green

J Nutr 2020 Jul 11. Epub 2020 Jul 11.

Department of Nutritional Sciences, College of Health and Human Development, The Pennsylvania State University, University Park, PA, USA.

It is widely accepted that the tricarboxylic acid (TCA) cycle is a critical partner for gluconeogenesis (GNG) in hepatocytes. Although researchers in the 1950s showed, using radiolabeled long-chain fatty acids, that acetate derived from fatty acid β-oxidation contributes carbon to glucose, fatty acids are not included on lists of gluconeogenic precursors in many textbooks of biochemistry and nutritional biochemistry. Here, by following the flow of carbon atoms through the mitochondrial TCA cycle and into cytosolic GNG, it is shown that carbons in acetyl-CoA derived from fatty acid β-oxidation will be found in glucose. Read More

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http://dx.doi.org/10.1093/jn/nxaa165DOI Listing

What Constitutes a Gluconeogenic Precursor?

J Nutr 2020 Jul 11. Epub 2020 Jul 11.

Department of Animal Science, North Carolina State University, Raleigh, NC, USA.

A gluconeogenic precursor is a biochemical compound acted on by a gluconeogenic pathway enabling the net synthesis of glucose. Recognized gluconeogenic precursors in fasting placental mammals include glycerol, lactate/pyruvate, certain amino acids, and odd-chain length fatty acids. Each of these precursors is capable of contributing net amounts of carbon to glucose synthesis via the tricarboxylic acid cycle (TCA cycle) because they are anaplerotic, that is, they are able to increase the pools of TCA cycle intermediates by the contribution of more carbon than is lost via carbon dioxide. Read More

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http://dx.doi.org/10.1093/jn/nxaa166DOI Listing

Fractionation of carbon isotopes of dissolved organic matter adsorbed to goethite in the presence of arsenic to study the origin of DOM in groundwater.

Environ Geochem Health 2020 Jul 10. Epub 2020 Jul 10.

School of Environment Studies, China University of Geosciences, Wuhan, 430074, China.

Natural dissolved organic matter (DOM) in groundwater plays a crucial role in mobilizing arsenic (As). The complex contribution of DOM sources makes it hard to predict how the variation of environmental conditions would affect the distribution of As concentrations. Identifying the carbon isotope fractionation of DOM is the key to quantify DOM sources based on stable carbon isotopes. Read More

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http://dx.doi.org/10.1007/s10653-020-00644-wDOI Listing

How China is fostering sustainable growth: the interplay of green investment and production-based emission.

Environ Sci Pollut Res Int 2020 Jul 10. Epub 2020 Jul 10.

Department of Accounting and Information, Ling Tung University, Taichung City, Taiwan.

To mitigate environmental problems and to achieve sustainability, China is striving to transition to low-carbon urban economies. Among several significant steps, the country has made remarkable success in controlling the emissions from transportation, buildings, and energy by shutting down or relocating several polluting industries. This study contributes to the issue of sustainable growth debate using time series data from China for the period 1998-2017 and empirically examines the effects of green investment and renewable energy consumption on production-based carbon emissions for China. Read More

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http://dx.doi.org/10.1007/s11356-020-09933-4DOI Listing

Barriers for plant establishment in the abandoned tailings of Nacozari, Sonora, Mexico: the influence of compost addition on seedling performance and tailing properties.

Environ Sci Pollut Res Int 2020 Jul 10. Epub 2020 Jul 10.

Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, C.P. 83250, Hermosillo, Sonora, Mexico.

Past mining activities have left a legacy of abandoned mine tailing deposits whose metal contaminants poses serious risks to ecosystems and human health. While the development of a vegetated cover in mine tailings can help in mitigating these risks, the local factors limiting plant establishment in these sites are not well understood, restricting phytostabilization efforts. Here, we explore some of the barriers that limit seedling establishment of two species (Vachellia farnesiana and Prosopis velutina) in a mine tailing deposit located in Nacozari, Sonora, Mexico, and assess whether compost addition can help in overcoming these barriers in pot and field experiments. Read More

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http://dx.doi.org/10.1007/s11356-020-09841-7DOI Listing

The impact of macroeconomic and financial development on carbon dioxide emissions in Pakistan: evidence with a novel dynamic simulated ARDL approach.

Environ Sci Pollut Res Int 2020 Jul 10. Epub 2020 Jul 10.

School of Economics and Management, Northeast Normal University, Changchun, Jilin, China.

This paper has empirically explored the impact of macroeconomic and financial development on CO emissions by utilizing a novel dynamic simulated ARDL model for annual time series data from 1982 to 2018 for Pakistan. The results of a novel dynamic simulated ARDL disclosed that the growth of stock market, FDI, economic growth, and consumption of oil wield a positive impact on CO emission, while domestic credit exerts a negative effect on CO emission both in the short and the long run in Pakistan. The stock market development and domestic credit wield a significant influence on carbon dioxide emission in Pakistan both in the long and the short run. Read More

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http://dx.doi.org/10.1007/s11356-020-09304-zDOI Listing

The role of tourism and renewable energy in testing the environmental Kuznets curve in the BRICS countries: fresh evidence from methods of moments quantile regression.

Environ Sci Pollut Res Int 2020 Jul 10. Epub 2020 Jul 10.

Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam.

BRICS are among the rising nations which drive economic growth by excessive utilization of resources and resulting in environment degradation. Although there is bulk of research on environmental Kuznets curve (EKC), very limited studies explored the scope in context of tourism in BRICS countries. So this research is conducted to explore the association of tourism, renewable energy, and economic growth with carbon emissions by using annual data of BRICS countries from the year 1995 to 2018. Read More

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http://dx.doi.org/10.1007/s11356-020-10011-yDOI Listing

Correction to: The impact of long dry periods on the aboveground biomass in a tropical forest: 20 years of monitoring.

Carbon Balance Manag 2020 Jul 10;15(1):14. Epub 2020 Jul 10.

Department of Forest Engineering, University of Brasília, Brasília, Brazil.

An amendment to this paper has been published and can be accessed via the original article. Read More

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http://dx.doi.org/10.1186/s13021-020-00149-0DOI Listing

Silanized carbon dot-based thermo-sensitive molecularly imprinted fluorescent sensor for bovine hemoglobin detection.

Anal Bioanal Chem 2020 Jul 11. Epub 2020 Jul 11.

Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, Henan, China.

Using the surface molecular imprinting technique, a thermo-sensitive molecularly imprinted fluorescent sensor was constructed for bovine hemoglobin (BHb) detection with the silanized carbon dots (CD@SiO) as fluorescent signal, N-isopropylacrylamide as monomer sensitive to temperature, and BHb as template. The silanized carbon dots coated by the molecularly imprinted polymer (CD@SiO@MIP) were characterized by high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, and fluorescence spectroscopy. Owing to the combination of the strong fluorescence sensitivity of CDs and the high selectivity of the molecular imprinting shell, the prepared sensor showed good recognition and detection performance to the target protein BHb, with a linear range of 0. Read More

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http://dx.doi.org/10.1007/s00216-020-02803-5DOI Listing

Analysis of flavonoids with unified chromatography-electrospray ionization mass spectrometry-method development and application to compounds of pharmaceutical and cosmetic interest.

Anal Bioanal Chem 2020 Jul 10. Epub 2020 Jul 10.

ICOA, CNRS UMR 7311, University of Orleans, rue de Chartres, BP 6759, 45067, Orléans, France.

In this project, we aimed at analysing flavonoid-type compounds with unified chromatography (joining supercritical fluid chromatography and enhanced fluidity liquid chromatography with carbon dioxide-methanol mobile phases covering a wide range of compositions) and diode-array and electrospray ionization mass spectrometric detection (UC-DAD-ESI-MS). First, the chromatographic method was developed for 9 standard flavonoid molecules from three different families (flavanols, flavanones and flavonols, glycosylated or not), with a strong focus on mobile phase composition to achieve the elution of a wide range of flavonoids with good chromatographic quality (efficiency and resolution). For this purpose, two stationary phases were selected (ACQUITY UPC DEA and Diol), and five different additives (formic acid, citric acid, phosphoric acid, methanesulfonic acid and ammonium hydroxide) were successively introduced in the methanol co-solvent. Read More

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http://dx.doi.org/10.1007/s00216-020-02798-zDOI Listing

Effects of Decabromodiphenyl Ether and Elevated Carbon Dioxide on Rice (Oryza sativa L.).

Bull Environ Contam Toxicol 2020 Jul 10. Epub 2020 Jul 10.

State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.

We assessed the effects of carbon dioxide (CO) and decabromodiphenyl ether (BDE-209, 0, 3 and 30 mg/kg) on rice (Oryza sativa L. cv. Wuyunjing) in field free-air CO enrichment system. Read More

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http://dx.doi.org/10.1007/s00128-020-02928-4DOI Listing

Transcriptional regulatory proteins in central carbon metabolism of Pichia pastoris and Saccharomyces cerevisiae.

Appl Microbiol Biotechnol 2020 Jul 10. Epub 2020 Jul 10.

Department of Chemical Engineering, Biochemical Reaction Engineering Laboratory, Middle East Technical University, Ankara, Turkey.

System-wide interactions in living cells and discovery of the diverse roles of transcriptional regulatory proteins that are mediator proteins with catalytic domains and regulatory subunits and transcription factors in the cellular pathways have become crucial for understanding the cellular response to environmental conditions. This review provides information for future metabolic engineering strategies through analyses on the highly interconnected regulatory networks in Saccharomyces cerevisiae and Pichia pastoris and identifying their components. We discuss the current knowledge on the carbon catabolite repression (CCR) mechanism, interconnecting regulatory system of the central metabolic pathways that regulate cell metabolism based on nutrient availability in the industrial yeasts. Read More

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http://dx.doi.org/10.1007/s00253-020-10680-2DOI Listing

Analysis of the photoheterotrophic assimilation of valerate and associated PHA production by .

Appl Environ Microbiol 2020 Jul 10. Epub 2020 Jul 10.

Laboratory of Proteomics and Microbiology, Research Institute for Biosciences, University of Mons, Mons, Belgium.

Purple non-sulfur bacteria are increasingly regarded for industrial applications in bioplastics, pigment and biomass production. In order to optimize the yield of future biotechnological processes, the assimilation of different carbon sources by () has to be understood. As they are released from several fermentation processes, volatile fatty acids (VFAs) represent a promising carbon source in the development of circular industrial applications. Read More

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http://dx.doi.org/10.1128/AEM.00901-20DOI Listing

Osseointegration and biosafety of graphene oxide wrapped porous CF/PEEK composites as implantable materials: The role of surface structure and chemistry.

Dent Mater 2020 Jul 7. Epub 2020 Jul 7.

Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024, China. Electronic address:

Objectives: To investigate the influence of surface microstructure and chemistry after modification on surface bioactivity and biosafety of carbon fibers reinforced PEEK (CF/PEEK) composites as implants.

Methods: CF/PEEK composites with different CF contents (0 wt%, 25 wt% and 40 wt%) were prepared by injection molding and treated by concentrated sulfuric acid. A porous network was produced on the surface by etching action. Read More

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http://dx.doi.org/10.1016/j.dental.2020.06.004DOI Listing

Association between rare variants in specific functional pathways and human neural tube defects multiple subphenotypes.

Neural Dev 2020 Jul 10;15(1). Epub 2020 Jul 10.

Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, 100020, China.

Background: Neural tube defects (NTDs) are failure of neural tube closure, which includes multiple central nervous system phenotypes. More than 300 mouse mutant strains exhibits NTDs phenotypes and give us some clues to establish association between biological functions and subphenotypes. However, the knowledge about association in human remains still very poor. Read More

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http://dx.doi.org/10.1186/s13064-020-00145-7DOI Listing

Engineering as a chassis for synthesis of five aromatic-derived natural products and chemicals.

ACS Synth Biol 2020 Jul 10. Epub 2020 Jul 10.

is a novel microbial chassis to upgrade renewable low-cost carbon feedstocks to high-value commodity chemicals and natural products. In this work, we systematically characterized and removed the rate-limiting steps of the shikimate pathway and achieved synthesis of five aromatic chemicals in . We determined that eliminating amino acids formation and engineering feedback-insensitive DAHP synthases are critical steps to mitigate precursor competition and relieve the feedback regulation of shikimate pathway. Read More

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http://dx.doi.org/10.1021/acssynbio.0c00185DOI Listing

Low Velocity Impact Response and Tensile Strength of Epoxy Composites with Different Reinforcing Materials.

Materials (Basel) 2020 Jul 8;13(14). Epub 2020 Jul 8.

Department of Theoretical and Applied Mechanics, Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland.

This paper presents the results of research concerning multilayered epoxy composites reinforced with different materials. The strength of multilayered composites depends, to a large extent, on the reinforcing material. The authors decided to compare the low velocity impact response and perform tensile strength tests on several composites, to ascertain the mechanical properties of the prepared composites. Read More

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http://dx.doi.org/10.3390/ma13143059DOI Listing

A Genomic Perspective on the Potential of Wild-Type Rumen Bacterium sp. LU1 as an Industrial Platform for Bio-Based Succinate Production.

Int J Mol Sci 2020 Jul 8;21(14). Epub 2020 Jul 8.

Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, 20-704 Lublin, Poland.

sp. LU1, a wild-type bacterium originating from goat rumen, proved to be a potential succinic acid producer in previous studies. Here, the first complete genome of this strain was obtained and analyzed from a biotechnological perspective. Read More

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http://dx.doi.org/10.3390/ijms21144835DOI Listing

Sustainable Carbon as Efficient Support for Metal-Based Nanocatalyst: Applications in Energy Harvesting and Storage.

Molecules 2020 Jul 8;25(14). Epub 2020 Jul 8.

Universitat Politècnica de València, Camino de Vera s/n Edificio 6C, 46022 Valencia, Spain.

Sustainable activated carbon can be obtained from the pyrolysis/activation of biomass wastes coming from different origins. Carbon obtained in this way shows interesting properties, such as high surface area, electrical conductivity, thermal and chemical stability, and porosity. These characteristics among others, such as a tailored pore size distribution and the possibility of functionalization, lead to an increased use of activated carbons in catalysis. Read More

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http://dx.doi.org/10.3390/molecules25143123DOI Listing

A Review on the Flammability Properties of Carbon-Based Polymeric Composites: State-of-the-Art and Future Trends.

Polymers (Basel) 2020 Jul 8;12(7). Epub 2020 Jul 8.

Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden.

Carbon based fillers have attracted a great deal of interest in polymer composites because of their ability to beneficially alter properties at low filler concentration, good interfacial bonding with polymer, availability in different forms, etc. The property alteration of polymer composites makes them versatile for applications in various fields, such as constructions, microelectronics, biomedical, and so on. Devastations due to building fire stress the importance of flame-retardant polymer composites, since they are directly related to human life conservation and safety. Read More

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http://dx.doi.org/10.3390/polym12071518DOI Listing

Antiresonant Hollow-Core Fiber-Based Dual Gas Sensor for Detection of Methane and Carbon Dioxide in the Near- and Mid-Infrared Regions.

Sensors (Basel) 2020 Jul 8;20(14). Epub 2020 Jul 8.

Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK.

In this work, we present for the first time a laser-based dual gas sensor utilizing a silica-based Antiresonant Hollow-Core Fiber (ARHCF) operating in the Near- and Mid-Infrared spectral region. A 1-m-long fiber with an 84-µm diameter air-core was implemented as a low-volume absorption cell in a sensor configuration utilizing the simple and well-known Wavelength Modulation Spectroscopy (WMS) method. The fiber was filled with a mixture of methane (CH) and carbon dioxide (CO), and a simultaneous detection of both gases was demonstrated targeting their transitions at 3. Read More

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http://dx.doi.org/10.3390/s20143813DOI Listing

The Indirect Tribological Role of Carbon Nanotubes Stimulating Zinc Dithiophosphate Anti-Wear Film Formation.

Nanomaterials (Basel) 2020 Jul 8;10(7). Epub 2020 Jul 8.

Department of Physics, Boston College, Boston, MA 02467-3804, USA.

Experimental studies reveal that the simultaneous addition of zinc dialkyl dithiophosphates (ZDDPs) and multi-wall carbon nanotubes (MWCNTs) to a poly-alpha-olefin base oil strongly reduces wear. In this paper, it is shown that MWCNTs promote the formation of an anti-wear (AW) layer on the metal surface that is much thicker than what ZDDPs can create as a sole additive. More importantly, the nanotubes' action is indirect, i. Read More

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http://dx.doi.org/10.3390/nano10071330DOI Listing

Rational Design of Amphiphilic Diblock Copolymer/MWCNT Surface Modifiers and Their Application for Direct Electrochemical Sensing of DNA.

Polymers (Basel) 2020 Jul 8;12(7). Epub 2020 Jul 8.

Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia.

We demonstrate the application of amphiphilic ionic poly(-butylmethacrylate)-- poly(2-(dimethylamino)ethyl methacrylate) diblock copolymers (PBMA--PDMAEMA, PBMA--PDMAEMA, PBMA--PDMAEMA) for dispersing multiwalled carbon nanotubes (MWCNTs) in aqueous media, a subsequent efficient surface modification of screen-printed electrodes (SPEs), and the application of the modified SPEs for DNA electrochemistry. Stable and fine aqueous dispersions of MWCNTs were obtained with PBMA--PDMAEMA diblock copolymers, regardless of the structure of the copolymer and the amount of MWCNTs in the dispersions. The effect of the diblock copolymer structure was important when the dispersions of MWCNTs were deposited as modifying layers on surfaces of SPEs, resulting in considerable increases of the electroactive surface areas and great acceleration of the electron transfer rate. Read More

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http://dx.doi.org/10.3390/polym12071514DOI Listing

Increased Adsorption of Heavy Metal Ions in Multi-Walled Carbon Nanotubes with Improved Dispersion Stability.

Molecules 2020 Jul 8;25(14). Epub 2020 Jul 8.

Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile.

In recent years, carbon nanotubes (CNTs) have been intensively studied as an effective adsorbent for the removal of pollutants from wastewater. One of the main problems for its use corresponds to the agglomeration of the CNTs due to the interactions between them, which prevents using their entire surface area. In this study, we test the effect of dispersion of oxidized multi-walled carbon nanotubes (MWCNTs) on the removal of heavy metals from acidic solutions. Read More

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http://dx.doi.org/10.3390/molecules25143106DOI Listing

Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region.

Atmos Chem Phys 2017 Dec 12;17(23):14785-14810. Epub 2017 Dec 12.

Centro de Ciências do Sistema Terrestre, Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, SP, Brazil.

Every year, a dense smoke haze covers a large portion of South America originating from fires in the Amazon Basin and central parts of Brazil during the dry biomass burning season between August and October. Over a large portion of South America, the average aerosol optical depth at 550 nm exceeds 1.0 during the fire season, while the background value during the rainy season is below 0. Read More

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http://dx.doi.org/10.5194/acp-17-14785-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7346277PMC
December 2017

Vertically Aligned Carbon Nanotubes as Platform for Biomimetically Inspired Mechanical Sensing, Bioactive Surfaces, and Electrical Cell Interfacing.

Adv Biosyst 2017 Nov 7;1(11):e1700101. Epub 2017 Sep 7.

Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss Str. 12, 64287, Darmstadt, Germany.

Vertically aligned carbon nanotubes (VACNTs) are one dimensional carbon objects anchored atop of a solid substrate. They are geometrically fixed in contrast to their counterparts, randomly oriented carbon nanotubes (CNTs). In this progress report, the breadth in which these one dimensional, mechanically flexible, though robust and electrical conducting carbon nanostructures can be employed as functional material is shown and our research is put in perspective to work in the last five to ten years. Read More

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http://dx.doi.org/10.1002/adbi.201700101DOI Listing
November 2017

Phase behaviors and supra-molecular structures of a series of symmetrically tapered bisamides.

Soft Matter 2006 Feb;2(3):232-242

Maurice Morton Institute and Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, USA.

A series of symmetrically tapered 1,4-bis[3,4,5-tris(alkan-1-yloxy)benzamido] benzene bisamides (CPhBA, where is the number of carbon atoms in the alkyl chains, = 10, 12 and 16), was synthesized in order to investigate the effect of alkyl chain length on supra-molecular ordered structures induced by hydrogen (H)-bonding and micro-phase separation. These bisamides consist of a rigid aromatic bisamide core with three flexible alkyl chains at each end of the core. Major phase transitions and their origins in CPhBA bisamides were studied with differential scanning calorimetry, one-dimensional (1D) wide angle X-ray diffraction (WAXD), infrared spectroscopy, and solid-state carbon-13 nuclear magnetic resonance experiments. Read More

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http://dx.doi.org/10.1039/b516557aDOI Listing
February 2006

A new route to carbon black filled polyHIPEs.

Soft Matter 2006 Mar;2(4):337-342

Department of Chemical Engineering, Polymer & Composite Engineering (PaCE) Group, Imperial College London, South Kensington Campus, London, UKSW7 2AZ.

A series of carbon black filled polyHIPEs was synthesised following a new preparation protocol. 1 wt% carbon black was dispersed in the monomer mixture. In order to enhance the stability of the suspension, polymer grafting of carbon black was performed by initiating the polymerisation prior to emulsifying the formulation. Read More

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http://dx.doi.org/10.1039/b517731fDOI Listing

Preparation and characterization of polyurethane-carbon nanotube composites.

Authors:
Hesheng Xia Mo Song

Soft Matter 2005 Oct;1(5):386-394

Institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough, Leicestershire, UKLE11 3TU.

Well-dispersed and long-term stable carbon nanotubes/polyol dispersions were prepared by a mechanochemical approach with the aid of dispersing agent. Polyurethane (PU)-carbon nanotube nanocomposites were prepared by further polymerization. Multi-walled carbon nanotubes (MWNT) can be dispersed individually. Read More

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http://dx.doi.org/10.1039/b509038eDOI Listing
October 2005

Organized arrays of nanostructures in freely suspended nanomembranes.

Soft Matter 2005 Oct;1(5):334-337

Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA.

This paper gives an overview of our recent work on freely suspended layer-by-layer nanomembranes containing organized arrays of nanostructures such as carbon nanotubes or gold nanoparticles. These unique organized arrays toughen the membrane and add interesting optical properties which are useful in sensor applications. Gold nanoparticle encapsulated nanomembranes were characterized by surface enhanced Raman scattering, while those filled with carbon nanotubes were examined by resonance Raman scattering. Read More

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http://dx.doi.org/10.1039/b510716dDOI Listing
October 2005

Utilizing polymers for shaping the interfacial behavior of carbon nanotubes.

Soft Matter 2006 Dec;2(1):24-28

Dep. of Chemistry, 560 Oval Drive, Purdue University, West Lafayette, IN USA47907-2084.

A major obstacle for utilization of carbon nanotubes is their tendency to bundle and pack into ropes that further entangle into networks, rendering the tubes insoluble in aqueous and organic liquids, and thus almost un-processable. As was shown recently, physically adsorbed block-copolymers may be used for exfoliating and dispersing carbon nanotubes in aqueous and organic media. In this approach entropic repulsion among polymeric layers attached to CNT induce steric repulsion among the polymer-decorated tubes. Read More

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http://dx.doi.org/10.1039/b513344kDOI Listing
December 2006

The key role of Geobacter in regulating emissions and biogeochemical cycling of soil-derived greenhouse gases.

Authors:
Tian Li Qixing Zhou

Environ Pollut 2020 Jul 2;266(Pt 3):115135. Epub 2020 Jul 2.

MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China. Electronic address:

In the past two decades, more and more attentions have been paid to soil-derived greenhouse gases (GHGs) including carbon dioxide (CO), methane (CH) and nitrous oxide (NO) because there are signs that they have rising negative impacts on the sustainability of the earth surface system. Farmlands, particularly paddy soils, have been regarded as the most important emitter of GHGs (nearly 17%) due to a large influx of fertilization and the abundance in animals, plants and microorganisms. Geobacter, as an electroactive microorganism widely occurred in soil, has been well studied on electron transport mechanisms and the direct interspecies electron transfer. Read More

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http://dx.doi.org/10.1016/j.envpol.2020.115135DOI Listing

Long-term variation in CO emissions with implications for the interannual trend in PM over the last decade in Beijing, China.

Environ Pollut 2020 Jul 4;266(Pt 3):115014. Epub 2020 Jul 4.

State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, Fujian, China.

Long-term CO and PM measurements in urban areas have important impacts on understanding the roles of urbanization in climate change and air pollution. From 2009 to 2017, CO fluxes were measured by the eddy covariance (EC) system at a height of 140 m on the Beijing Meteorological Tower. The CO fluxes followed a typical two-peak diurnal pattern all year round. Read More

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http://dx.doi.org/10.1016/j.envpol.2020.115014DOI Listing
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