26,367 results match your criteria organic field


Organic optical agents for image-guided combined cancer therapy.

Biomed Mater 2021 Apr 19. Epub 2021 Apr 19.

College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin, 300071, CHINA.

As a promising non-invasive treatment method, phototherapy has attracted extensive attention in the field of combined cancer therapy. Among various optical agents, organic ones have been considered as a promising clinical phototheranostic agent due to its high safety and non-toxic property. In addition, due to the clear structure, facile processability, organic optical agents can be easily endowed with multiple imaging and phototherapeutic functions, significantly simplifying the relatively complex system of imaging-guided combined cancer therapy. Read More

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Halogen-Bonded Organic Framework (XOF) Based on Iodonium-Bridged N···I+···N Interactions: A Type of Diphase Periodic Organic Network.

Angew Chem Int Ed Engl 2021 Apr 19. Epub 2021 Apr 19.

Wuhan University, The Institute of Advanced Studies, 299 Bayi Road, 430072, Wuhan, CHINA.

Due to the fascinating structures and wide applications, porous materials with open frameworks have attracted more and more attentions. Herein, a novel two-dimensional (2D) halogen-bonded organic framework ( XOF-TPPE ) was successfully designed and fabricated by iodonium-bridged N···I + ···N interactions between pyridyl groups and I + for the first time. The formation of XOF-TPPE and its linear analogue was monitored by 1 H NMR, UV-Vis, X-ray photoelectron spectroscopy (XPS), IR, SEM, TEM, HRTEM and selected-area electron diffraction (SAED). Read More

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Phosphorus containing porous organic polymers: synthetic techniques and applications in organic synthesis and catalysis.

Org Biomol Chem 2021 Apr 19. Epub 2021 Apr 19.

Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India.

The phosphorus-containing porous organic polymer is a trending material for the synthesis of heterogeneous catalysts. Decades of investigations have established phosphines as versatile ligands in homogeneous catalysis. Recently, phosphine-based heterogeneous catalysts were synthesized to exploit the same electronic properties while leveraging extra stability and reusability. Read More

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Solvent Induced Helix Folding of Defined Indolenine Squaraine Oligomers.

Chemistry 2021 Apr 19. Epub 2021 Apr 19.

Universitat Wurzburg, Institut fur Organische Chemie, Am Hubland, D-97074, Würzburg, GERMANY.

A protecting group strategy was employed to synthesise a series of indolenine squaraine dye oligomers up to the nonamer. The longer oligomers show a distinct solvent dependence of the absorption spectra, that is, either a strong blue shift or a strong red shift of the lowest energy bands in the near infrared spectral region. This behaviour is explained by exciton coupling theory as being due to H- or J-type coupling of transition moments. Read More

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Nanoscale metal-organic frameworks for tumor phototherapy.

J Mater Chem B 2021 Apr 19. Epub 2021 Apr 19.

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 210009, P. R. China.

Metal-Organic Frameworks (MOFs) are constructed from metal ions/cluster nodes and functional organic ligands through coordination bonds. Owing to the advantages of diverse synthetic methods, easy modification after synthesis, large adsorption capacity for heavy metals, and short equilibrium time, considerable attention has recently been paid to MOFs for tumor phototherapy. Through rational tuning of metal ions and ligands, MOFs present abundant properties for various applications. Read More

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Metal-organic frameworks as catalytic selectivity regulators for organic transformations.

Chem Soc Rev 2021 Apr 19. Epub 2021 Apr 19.

CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China.

Selective organic transformations using metal-organic frameworks (MOFs) and MOF-based heterogeneous catalysts have been an intriguing but challenging research topic in both the chemistry and materials communities. Analogous to the reaction specificity achieved in enzyme pockets, MOFs are also powerful platforms for regulating the catalytic selectivity via engineering their catalytic microenvironments, such as metal node alternation, ligand functionalization, pore decoration, topology variation and others. In this review, we provide a comprehensive introduction and discussion about the role of MOFs played in regulating and even boosting the size-, shape-, chemo-, regio- and more appealing stereo-selectivity in organic transformations. Read More

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Phosphorus availability and exchangeable aluminum response to phosphate rock and organic inputs in the Central Highlands of Kenya.

Heliyon 2021 Mar 8;7(3):e06371. Epub 2021 Mar 8.

Department of Agricultural Resource Management, University of Embu, PO Box 6-60100, Embu Kenya.

Soil acidity and phosphorus deficiency are some of the constraints hampering agricultural production in tropical regions. The prevalence of soil acidity is associated with phosphorus (P) insufficiency and aluminum saturation. We conducted a two-seasons experiment to evaluate soil phosphorus availability and exchangeable aluminum in response to phosphate rock and organic inputs in acidic . Read More

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Dataset of cow manure by earthworm bio-composting process.

Data Brief 2021 Jun 18;36:106966. Epub 2021 Mar 18.

Agricultural Comprehensive Service Center of Fangcheng, Linyi 273406, China.

Earthworm bio-composting is an environmentally friendly way of processing agricultural organic waste, especially cow manure. In order to observe the temperature, humidity and conductivity of cow manure during the biological composting process of earthworms, a composting data collection system was designed to collect the above data. The experiment was carried out in an earthworm breeding farm in Changqing District, Jinan City, and lasted for 50 days, from October 21, 2020 to December 10, 2020. Read More

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Effect of cotton residues incorporation on soil properties, organic nitrogen fractions, and nitrogen-mineralizing enzyme activity under long-term continuous cotton cropping.

PeerJ 2021 7;9:e11053. Epub 2021 Apr 7.

The Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi University, Shihezi, Xinjiang, China.

The objective of this experiment was to study the effect of cotton residues incorporation on soil properties, soil organic nitrogen (N) fractions, and N-mineralizing enzyme (protease, and urease) activity in the 0-40 cm soil layer in the long-term continuous cotton field. In this experiment, seven treatments, including cotton residues incorporation for 5, 10, 15 and 20 years (marked as 5a, 10a, 15a, and 20a) and continuous cropping for 5, 10 and 20 years (marked as CK5, CK10 and CK20) were conducted. The results showed that the soil organic carbon (C) and N increased gradually with the increase in the duration of continuous cropping with cotton residues incorporation. Read More

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Exceptional adsorption of different spectral indices of natural organic matter (NOM) by using cerium oxide nanoparticles (CONPs).

Environ Sci Pollut Res Int 2021 Apr 17. Epub 2021 Apr 17.

Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, 826004, India.

In this study, the efficiency of cerium oxide nanoparticles (CONPs) was examined for the adsorptive removal of various spectral indices of Natural Organic Matter (NOM). Two methods, viz. efficient microwave combustion (ECM) and hydroxide mediated approach (HMA), were used to synthesize CONPs. Read More

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The enhanced mixing states of oxalate with metals in single particles in Guangzhou, China.

Sci Total Environ 2021 Apr 7;783:146962. Epub 2021 Apr 7.

Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollution Jinan University, Guangzhou 510632, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 510632, China.

Recently, internal mixing states of oxalate with metals in single particles have been reported from field studies, yet the role of metals in the formation processes of oxalate remains unclear due to the diversity of chemical components and complex atmospheric environment. In this study, the mixing states of oxalate with five metals, including zinc (Zn), copper (Cu), lead (Pb), vanadium (V) and iron (Fe) were investigated in Guangzhou, China. It was found that 55% of oxalate-containing particles were internally mixed with these metals. Read More

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Hotpots and trends of covalent organic frameworks (COFs) in the environmental and energy field: Bibliometric analysis.

Sci Total Environ 2021 Mar 31;783:146838. Epub 2021 Mar 31.

Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

Covalent organic frameworks (COFs) have attracted extensive attention due to their low density, adjustable structure, functionalization, and good stability. This paper systematically and comprehensively describes to qualitatively and quantitatively the progress, trends, and hotspots of COFs in the environmental and energy fields from the perspective of bibliometrics. Herein, based on the Web of Science database, a total of 2589 articles from 2005 to October 6, 2020, were collected. Read More

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Investigation on removal effects and condensation characteristics of condensable particulate matter: Field test and experimental study.

Sci Total Environ 2021 Apr 14;783:146985. Epub 2021 Apr 14.

Shandong Engineering Laboratory for Solid Waste Green Materials, National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250014, China.

Condensable particulate matter (CPM) has become the main part of the total primary PM emitted from stationary sources and has aroused increasing concern. In this work, the removal effects of wet flue gas desulfurization (WFGD) on CPM components were studied. A new CPM-containing flue gas system was designed and used to investigate the condensation characteristics of 16 PAHs, sulfuric acid mist and SO conversion into CPM. Read More

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Enhanced Fenton-like degradation of sulfadiazine by single atom iron materials fixed on nitrogen-doped porous carbon.

J Colloid Interface Sci 2021 Apr 1;597:56-65. Epub 2021 Apr 1.

Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China; Environmental Materials and Pollution Control Laboratory, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, PR China. Electronic address:

The use of single-atom iron catalysts in heterogeneous Fenton-like reactions has demonstrated tremendous potential for antibiotic wastewater treatment. In this study, single-atom iron fixed on nitrogen-doped porous carbon materials (Fe-ISAs@CN) was synthesised using a metal organic framework (MOF) as a precursor. Fe-ISAs@CN was applied as a heterogeneous Fenton catalyst to activate HO for the degradation of sulfadiazine (SDZ) in an aqueous solution. Read More

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Perovskite Solar Cells for Space Applications: Progress and Challenges.

Adv Mater 2021 Apr 16:e2006545. Epub 2021 Apr 16.

Frontiers Science Center for Flexible Electronics (FSCFE), Xi'an Institute of Flexible Electronics (IFE) & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China.

Metal halide perovskites have aroused burgeoning interest in the field of photovoltaics owing to their versatile optoelectronic properties. The outstanding power conversion efficiency, high specific power (i.e. Read More

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How to Efficiently Prepare Transparent Lubricant-Infused Surfaces: Inspired by Candle Soot.

Langmuir 2021 Apr 16. Epub 2021 Apr 16.

Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China.

Poly(dimethylsiloxane) is a common dispersant, modifier, and binder in the field of bioinspired wettability. Herein, the soot production when poly(dimethylsiloxane) was burning was used to directly construct a superhydrophobic coating with the water contact angle reaching 159.7°. Read More

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Production of Formate via Oxidation of Glyoxal Promoted by Particulate Nitrate Photolysis.

Environ Sci Technol 2021 Apr 16. Epub 2021 Apr 16.

School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.

Particulate nitrate photolysis can produce oxidants (i.e., OH, NO, and NO/HNO) in aqueous droplets and may play a potential role in increased atmospheric oxidative capacity. Read More

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Free-living nematode assemblages associated with maize residues and their ecological significance.

J Nematol 2021 1;53. Epub 2021 Apr 1.

Department of Biological Sciences, University of Embu, P.O. Box 6-60100, Embu, Kenya.

Return of plant residues to the soil is a sustainable way of enhancing plant growth, health, and levels of soil quality. In Kenya, maize plant residues are the most commonly returned plant material in many agro-ecosystems. For any plant material to release nutrients into the soil, it must undergo a decomposition process that is usually affected by various organisms, especially nematodes. Read More

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Integrated Genomic and Greenhouse Assessment of a Novel Plant Growth-Promoting Rhizobacterium for Tomato Plant.

Front Plant Sci 2021 30;12:660620. Epub 2021 Mar 30.

Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza, Italy.

Plant growth promoting rhizobacteria (PGPR) can display several plant-beneficial properties, including support to plant nutrition, regulation of plant growth, and biocontrol of pests. Mechanisms behind these effects are directly related to the presence and expression of specific genes, and different PGPR strains can be differentiated by the presence of different genes. In this study we reported a comprehensive evaluation of a novel PGPR UC4115 from the field to the lab, and from the lab to the plant. Read More

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Diversification of terpenoid emissions proposes a geographic structure based on climate and pathogen composition in Japanese cedar.

Sci Rep 2021 Apr 15;11(1):8307. Epub 2021 Apr 15.

Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8577, Japan.

Biogenic volatile organic compounds emitted from plants are important constituents of atmospheric chemistry and play a major role in the resistance of plants against various environmental stresses. However, little is known about how abiotic and biotic environments on a geographic scale relate to diversifications of the emission. Here, we present variations of terpenes stored in and emitted from leaves of a single species in a common garden, using genetically differentiated local populations of Japanese cedar, the most dominant and widely distributed tree species in Japan. Read More

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Spatial variability of saturated hydraulic conductivity and its links with other soil properties at the regional scale.

Sci Rep 2021 Apr 15;11(1):8293. Epub 2021 Apr 15.

Institute of Agrophysics, Polish Academy of Sciences, Doswiadczalna 4, 20-290, Lublin, Poland.

Saturated hydraulic conductivity (K) is a key property for evaluating soil water movement and quality. Most studies on spatial variability of K have been performed soil at a field or smaller scale. Therefore, the aim of this work was to assess (quantify) the spatial distribution of K at the larger regional scale in south-eastern Poland and its relationship with other soil properties, including intrinsic sand, silt, and clay contents, relatively stable organic carbon, cation exchange capacity (CEC) and temporally variable water content (WC), total porosity (FI), and dry bulk density (BD) in the surface layer (0-20 cm). Read More

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Soil CO emission and soil attributes associated with the microbiota of a sugarcane area in southern Brazil.

Sci Rep 2021 Apr 15;11(1):8325. Epub 2021 Apr 15.

School of Agricultural and Veterinarian Sciences (FCAV), São Paulo State University (Unesp), Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal, São Paulo, 14884-900, Brazil.

The spatial structure of soil CO emission (FCO) and soil attributes are affected by different factors in a highly complex way. In this context, this study aimed to characterize the spatial variability patterns of FCO and soil physical, chemical, and microbiological attributes in a sugarcane field area after reform activities. The study was conducted in an Oxisol with the measurement of FCO, soil temperature (Ts), and soil moisture (Ms) in a regular 90 × 90-m grid with 100 sampling points. Read More

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Quantification of electron accumulation at grain boundaries in perovskite polycrystalline films by correlative infrared-spectroscopic nanoimaging and Kelvin probe force microscopy.

Light Sci Appl 2021 Apr 15;10(1):84. Epub 2021 Apr 15.

State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.

Organic-inorganic halide perovskites are emerging materials for photovoltaic applications with certified power conversion efficiencies (PCEs) over 25%. Generally, the microstructures of the perovskite materials are critical to the performances of PCEs. However, the role of the nanometer-sized grain boundaries (GBs) that universally existing in polycrystalline perovskite films could be benign or detrimental to solar cell performance, still remains controversial. Read More

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Waste activated sludge stimulates in situ microbial reductive dehalogenation of organohalide-contaminated soil.

J Hazard Mater 2021 Jun 21;411:125189. Epub 2021 Jan 21.

Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-Sen University, Guangzhou 510275, China. Electronic address:

Due to its enriched organic matter, nutrients and growth cofactors, as well as a diverse range of microorganisms, waste activated sludge (WAS) might be an ideal additive to stimulate organohalide respiration for in situ bioremediation of organohalide-contaminated sites. In this study, we investigated the biostimulation and bioaugmentation impacts of WAS-amendment on the performance and microbiome in tetrachloroethene (PCE) and polychlorinated biphenyls (PCBs) dechlorinating microcosms. Results demonstrated that WAS-amendment increased PCE- and PCBs-dechlorination rate as much as 6. Read More

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Nanoscale Metal-Organic Frameworks That are Both Fluorescent and Hollow for Self-Indicating Drug Delivery.

ACS Appl Mater Interfaces 2021 Apr 15. Epub 2021 Apr 15.

Department of Biomedical Engineering, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Xili, Nanshan District, Shenzhen, Guangdong 518055, P. R. China.

Nanoscale metal-organic frameworks (MOFs) that are both fluorescent and hollow are attracting increasing interest in recent years, but ideal candidates prepared by reliable methods for biomedical applications are still very limited. Herein, we for the first time prepared tetrakis[4-(4-carboxyphenyl)phenyl]ethene (TCBPE)-based MOF nanotubes with hollow nanostructures, which could emit strong fluorescence. It was further discovered that the formation of this hollow hexagonal nanotube underwent a self-templated growth and a subsequent concaving process, which revealed that the synthesis of this MOF was kinetic rather than thermodynamic. Read More

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Facile, Smart, and Degradable Metal-Organic Framework Nanopesticides Gated with Fe-Tannic Acid Networks in Response to Seven Biological and Environmental Stimuli.

ACS Appl Mater Interfaces 2021 Apr 15. Epub 2021 Apr 15.

Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China.

Nanopesticides were selected as one of the top 10 emerging technologies in chemistry that will change our world in 2019. Facile, smart, and degradable metal-organic framework MIL-101(Fe) nanopesticides gated with Fe-tannic acid (TA) networks are created using a universal strategy. The capping of the Fe-TA network gatekeepers is instinctively oriented by the coordinatively unsaturated Fe sites on the surfaces of the MIL-101(Fe) nanocarriers; thus, their combination is perfectly matched. Read More

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Organic Carbon Linkage with Soil Colloidal Phosphorus at Regional and Field Scales: Insights from Size Fractionation of Fine Particles.

Environ Sci Technol 2021 Apr 15. Epub 2021 Apr 15.

Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310058, China.

Nano and colloidal particles (1-1000 nm) play important roles in phosphorus (P) migration and loss from agricultural soils; however, little is known about their relative distribution in arable crop soils under varying agricultural geolandscapes at the regional scale. Surface soils (0-20 cm depth) were collected from 15 agricultural fields, including two sites with different carbon input strategies, in Zhejiang Province, China, and water-dispersible nanocolloids (0.6-25 nm), fine colloids (25-160 nm), and medium colloids (160-500 nm) were separated and analyzed using the asymmetrical flow field flow fractionation technique. Read More

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Magnitudes and environmental drivers of greenhouse gas emissions from natural wetlands in China based on unbiased data.

Environ Sci Pollut Res Int 2021 Apr 15. Epub 2021 Apr 15.

Environment Research Institute, Shandong University, Qingdao, 266237, China.

Whether natural wetlands serve as the source or sink of greenhouse gases (GHGs) remains uncertain. Wetlands in China are diverse in type and abundant in quantity and differ greatly in spatial distribution, environmental conditions, and GHG fluxes. However, few studies focused on the differences in GHG emissions from different types of natural wetlands. Read More

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Dataset of AMBER force field parameters of drugs, natural products and steroids for simulations using GROMACS.

Data Brief 2021 Apr 15;35:106948. Epub 2021 Mar 15.

Institute of Biological Information Processing: Structural Biochemistry (IBI-7), Forschungszentrum Jülich, Jülich 52428, Germany.

We provide general AMBER force field (GAFF) parameters for 160 organic molecules including drugs, natural products, and steroids, which can be employed without further processing in molecular dynamics (MD) simulations using GROMACS. We determined these parameters based on quantum mechanical (QM) calculations involving geometry optimization at the HF6-31G* level of theory. For each molecule we provide a coordinate file of the three-dimensional molecular structure, the topology and the parameter file. Read More

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Assessment of Antiviral Effect of Natural Compounds on Porcine Epidemic Diarrhea Coronavirus.

Front Vet Sci 2021 29;8:652000. Epub 2021 Mar 29.

Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain.

Organic acid and essential oils (EOs), well-known antimicrobials, could also possess antiviral activity, a characteristic which has not been completely addressed up to now. In this study, the effect of two organic acids (formic acid and sodium salt of coconut fatty acid distillates) and two single EO compounds (thymol and cinnamaldehye) was evaluated against porcine epidemic diarrhea virus (PEDV). The concentration used for each compound was established by cytotoxicity assays in Vero cells. Read More

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