857 results match your criteria yellow silver


sp. nov., isolated from the pod of soybean, .

Int J Syst Evol Microbiol 2021 Apr;71(4)

Medical Laser Research Center, Dankook University, Cheonan 31116, Republic of Korea.

Soybean pods, separated and enclosed from the outside environment, are considered a suitable place to find new microbes. A Gram-stain-negative, aerobic bacterium, bacterial strain (YB22) was isolated from the pod of (soybean) collected from a rural area in Republic of Korea and characterized by using polyphasic taxonomy. Cells of the strain were rod-shaped (approximately 0. Read More

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Green synthesis of silver nanoparticles using Annona squamosa L. seed extract: characterization, photocatalytic and biological activity assay.

Bioprocess Biosyst Eng 2021 Apr 6. Epub 2021 Apr 6.

Department of Chemistry, Centre for Sustainability Science, St. Thomas College (Autonomous), University of Calicut, Thrissur, Kerala, 680001, India.

The aqueous seed extract of Annona squamosa L. was used as a reducing and stabilizing agent for the synthesis of silver nanoparticles (AgNPs). The formation of AgNPs in aqueous silver nitrate solution after the addition of the extract was indicated by a colour change from pale yellow to dark brown corresponding to a λ at 430 nm. Read More

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Photodeposition of Silver on Zinc/Calcium Ferrite Nanoparticles: A Contribution to Efficient Effluent Remediation and Catalyst Reutilization.

Nanomaterials (Basel) 2021 Mar 24;11(4). Epub 2021 Mar 24.

Physics Center of Minho and Porto Universities (CF-UM-UP), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.

The efficient photodegradation of textile dyes is still a challenge, especially considering resistant azo dyes. In this work, zinc/calcium mixed ferrite nanoparticles prepared by the sol-gel method were coupled with silver by a photodeposition method to enhance the photocatalytic potency. The obtained zinc/calcium ferrites are mainly cubic-shaped nanoparticles sized 15 ± 2 nm determined from TEM and XRD and an optical bandgap of 1. Read More

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Rapid and simple colorimetric detection of hydrogen sulfide using an etching-resistant effect on silver nanoprisms.

Mikrochim Acta 2021 Mar 19;188(4):129. Epub 2021 Mar 19.

Department of Medical Engineering, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea.

A fast and sensitive colorimetric paper sensor has been developed using silver nanoprisms (Ag NPRs) with an edge length of ~50 nm for the detection of free HS gas. We prepared two types of Ag NPRs-coated HS sensing papers: a multi-zone patterned paper for passive (diffusion mode), and a single-zone patterned paper for pumped mode of HS gas. The change in color intensity was quantitatively analyzed of Ag NPRs-coated paper after KCl treatment depending on the concentration of HS gas, from yellow to purplish brown. Read More

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Pre-existing Immunity to Japanese Encephalitis Virus Alters CD4 T Cell Responses to Zika Virus Inactivated Vaccine.

Front Immunol 2021 24;12:640190. Epub 2021 Feb 24.

Cellular Immunology Section, US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD, United States.

The epidemic spread of Zika virus (ZIKV), associated with devastating neurologic syndromes, has driven the development of multiple ZIKV vaccines candidates. An effective vaccine should induce ZIKV-specific T cell responses, which are shown to improve the establishment of humoral immunity and contribute to viral clearance. Here we investigated how previous immunization against Japanese encephalitis virus (JEV) and yellow fever virus (YFV) influences T cell responses elicited by a Zika purified-inactivated virus (ZPIV) vaccine. Read More

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February 2021

Diverse activities and biochemical properties of amylase and proteases from six freshwater fish species.

Sci Rep 2021 Mar 11;11(1):5727. Epub 2021 Mar 11.

Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.

This study investigated the biochemical properties, enzyme activities, isoenzyme pattern, and molecular weight of three types of digestive enzyme from six freshwater fish species: Puntius gonionotus (common silver barb), Puntioplites proctozysron (Smith's barb), Oreochromis niloticus (Nile tilapia), Hemibagrus spilopterus (yellow mystus), Ompok bimaculatus (butter catfish), and Kryptopterus geminus (sheatfish). The optimum pHs for amylase and alkaline protease activities were 7.0-8. Read More

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Ultrasonically developed silver/iota-carrageenan/cotton bionanocomposite as an efficient material for biomedical applications.

Int J Biol Macromol 2021 Mar 8;180:439-457. Epub 2021 Mar 8.

Department of Chemistry, Yadegar-e-Imam Khomeini (RAH) Branch, Islamic Azad University, Tehran, Iran.

In this approach, we assembled AgNps on cotton by using iota-carrageenan as a carbohydrate polymer under ultrasonic waves. UV-Vis spectroscopy revealed that iota-carrageenan free radicals increased the absorbance values of AgNps at 438 nm under ultrasonic vibration. We also observed an effective reduction of AgNps by color hue changes in the colloidal dispersions, ranging from pale to dark yellow. Read More

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Inkjet-printed paper-based colorimetric sensor coupled with smartphone for determination of mercury (Hg).

J Hazard Mater 2021 Feb 25;414:125440. Epub 2021 Feb 25.

Chhattisgarh Council of Science & Technology, Vighyan Bhawan, Vidhan Sabha Road, Daldal Seoni, Raipur 492014, India.

We report an inkjet-printed paper based colorimetric sensor with silver nanoparticles (AgNPs) using smartphone and color detector App for on-site determination of mercuric ion (Hg) from environmental water samples. The AgNPs printed on Whatman filter paper (No. 1) is employed for detection of Hg which is reliant on the color change of NPs from yellow to discoloration depending on the concentration of target analyte in sample solution. Read More

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February 2021

Synthesis of silver nanoparticles using Lactobacillus bulgaricus and assessment of their antibacterial potential.

Braz J Biol 2021 5;82:e232434. Epub 2021 Mar 5.

University of Swabi, Department of Microbiology, Swabi, KP, Pakistan.

Many pathogenic strains have acquired multidrug-resistant patterns in recent a year, which poses a major public health concern. The growing need for effective antimicrobial agents as novel therapies against multidrug-resistant pathogens has drawn scientist attention toward nanotechnology. Silver nanoparticles are considered capable of killing multidrug-resistant isolates due to their oligo-dynamic effect on microorganisms. Read More

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Occupational Localized Cutaneous Argyria With Pseudo-Ochronosis in a Jeweler.

Am J Dermatopathol 2021 Feb 16. Epub 2021 Feb 16.

Department of Dermatology, Chelsea and Westminster Hospital, London, United Kingdom; Department of Histopathology, Royal Hallamshire Hospital, Sheffield, United Kingdom; Biomedical Imaging Unit, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom; Department of Plastic and Reconstructive Surgery, Chelsea and Westminster Hospital, London, United Kingdom; and Department of Dermatopathology, St George's University Hospital, London, United Kingdom.

Abstract: A case of localized argyria in a 36-year-old female jeweler is described who presented with 2 discrete and asymptomatic bluish-black pigmented macules on the pulp of her left middle finger. A skin biopsy from both lesions demonstrated deposition of brown/black pigmented granules along the basement membrane zone of eccrine glands, blood vessels, nerves, and the dermo-epidermal junction fully in keeping with silver deposition. In addition, there was yellow-brown deposition seen within the interstitial dermis mimicking an early form of ochronosis, so called "pseudo-ochronosis. Read More

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February 2021

Colorimetric detection of individual biothiols by tailor made reactions with silver nanoprisms.

Sci Rep 2021 Feb 16;11(1):3937. Epub 2021 Feb 16.

Department of Chemical and Biomolecular Engineering (BK 21+ Program), KAIST, Daehak-ro 291, Yuseong-gu, Daejeon, 34141, Republic of Korea.

We herein described a rapid, sensitive, and selective colorimetric sensing platform for biothiols in human serum, which relies on the dual functions of biothiols as anti-etching and aggregating agent for silver nanoprisms (AgNPRs). In principle, the target biothiols that bind to the surface of AgNPRs through Ag-S covalent interactions protect the AgNPRs from being etched by chloride ion (Cl) in human serum, thus exhibiting the blue/purple color that is indicative of AgNPRs. On the other hand, the color of AgNPRs turned to yellow in the absence of biothiols or the presence of non-sulfur-containing amino acids, indicating the formation of small silver nanoparticles (AgNPs). Read More

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February 2021

A ratiometric fluorescence assay for bleomycin based on dual-emissive chameleon DNA-templated silver nanoclusters.

Spectrochim Acta A Mol Biomol Spectrosc 2021 May 1;252:119521. Epub 2021 Feb 1.

School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China. Electronic address:

The authors design dual-emissive DNA-templated silver nanoclusters (DNA-AgNCs) for ratiometric fluorescence sensing bleomycin (BLM) for the first time. A hairpin probe containing two different C-rich DNA templates at two terminals is used to synthesize chameleon DNA-AgNCs, which possess two emission peaks when they are in close proximity. A strong emission is founded at 622 nm (λex = 570 nm) while a weak one is located at 572 nm (λex = 504 nm). Read More

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Transcriptome reveals genes involving in black skin color formation of ducks.

Genes Genomics 2021 Feb 2;43(2):173-182. Epub 2021 Feb 2.

Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, People's Republic of China.

Background: Skin color is colorful for birds, which has been reported to be associated with multi-biological functions, such as crypsis, camouflage, social signaling and mate choice, but little is known about its underlying molecular mechanism.

Objective: Studies on the major genes affecting the black skin color of ducks.

Methods: For this purpose, Silver ammonia staining and RNA-seq analysis were carried out to identify the differences in tissue morphology and gene expressions between black and yellow skin ducks. Read More

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February 2021

Characterization of Glass Insulating Thick Films with Ag Conductors for Multilayer Packages.

Materials (Basel) 2021 Jan 21;14(3). Epub 2021 Jan 21.

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.

In this paper, an insulating film was successfully prepared by sintering 35 wt % CaO-15 wt % AlO-10 wt % BO-40 wt % SiO glass at 875 °C. After sintering, the main component of the insulating film was glass-ceramics. The main crystal phase was CaAlSiO, and the crystallization activation energy was 189. Read More

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January 2021

Functionalized silver nanoparticles as colorimetric probes for sensing tricyclazole.

Food Chem 2021 Jun 9;347:129044. Epub 2021 Jan 9.

Department of Applied Science, National Taitung University, Taitung, Taiwan. Electronic address:

A colorimetric assay for highly selective and sensitive detection of tricyclazole using fluorescein-functionalized silver nanoparticles (F-AgNPs) as sensing probes was investigated. As the addition of tricyclazole to F-AgNPs, a drastic decrease in the absorbance at 394 nm was detected, which was accompanied with a noticeable color change from yellow to gray. The sensing mechanism involved an interaction between tricyclazole and F-AgNPs, which led to aggregation of the latter, inducing a color change from yellow to gray. Read More

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Biofabrication of ecofriendly copper oxide nanoparticles using Ocimum americanum aqueous leaf extract: analysis of in vitro antibacterial, anticancer, and photocatalytic activities.

Environ Sci Pollut Res Int 2021 Jan 6. Epub 2021 Jan 6.

Laboratory of Aquabiotics/Nanoscience, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu, 620 024, India.

Nanotechnology tends to be a swiftly growing field of research that actively influences and inhibits the growth of bacteria/cancer. Noble metal nanoparticles (NPs) such as silver, copper, and gold have been used to damage bacterial and cancer growth over recent years; however, the toxicity of higher NPs concentrations remains a major issue. The copper oxide nanoparticles (CuONPs) were therefore fabricated using a simple green chemistry approach. Read More

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January 2021

Evaluation of Cytotoxic Effect of Silver Nanoparticles (AgNP) Synthesized from Phlebodium aureum (L.) J. Smith Extracts.

Anticancer Agents Med Chem 2020 Dec 30. Epub 2020 Dec 30.

National Centre for Nanoscience and Nanotechnology, University of Madras, Chennai, Tamil Nadu,. India.

Background: Chemical synthesis methods are adverse in the medicinal field as they produce toxic in the surface whereas green synthesis provide advancement as well as they are cost effective, environment friendly, can be easily scaled up for large scale synthesis. Silver and silver nanoparticles have an important application in the medical industry such as tropical ointments which are used to prevent infection against burn and open wounds. There is no report on the green synthesis from Phlebodium aureum (L. Read More

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December 2020

l-Cysteine modified silver nanoparticles-based colorimetric sensing for the sensitive determination of Hg in aqueous solutions.

Luminescence 2021 May 17;36(3):698-704. Epub 2020 Dec 17.

College of Public Health, University of South China, Hengyang, People's Republic of China.

A simple and sensitive colorimetric sensing method was constructed for detection of Hg in aqueous solutions and based on silver nanoparticles functionalized with l-cysteine (l-Cys-Ag NPs). In this method, adenosine triphosphate (ATP) induced aggregation of l-Cys-Ag NPs. Simultaneously, the solution colour changed from bright yellow to brown. Read More

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Oxygen-rich bismuth oxybromide nanosheets coupled with AgO as Z-scheme nano-heterostructured plasmonic photocatalyst: Solar light-activated photodegradation of dye pollutants.

J Hazard Mater 2021 Apr 2;408:124406. Epub 2020 Nov 2.

Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran; Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran.

In this research to enhance the photocatalytic activity of BiOBr, precipitation fabrication of the Z-scheme heterojunction with Ag-AgO has been investigated. The characterizations were carried out by XRD, FESEM, TEM, EDX, BET-BJH, DRS and pH analyzes. The Ag-AgO/BiOBr Z-scheme heterojunction nanophotocatalyst with weighted ratio of 3:1 exhibited the wide absorption in the visible light region and displayed the high photocatalytic activity for the photodegradation of acid orange 7 (96. Read More

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Dual Colorimetric Sensor for Hg/Pb and an Efficient Catalyst Based on Silver Nanoparticles Mediating by the Root Extract of .

Front Chem 2020 22;8:591958. Epub 2020 Oct 22.

Institute for Advanced Study, Shenzhen University, Shenzhen, China.

Environmental pollution derivated from toxic metals and organic toxins is becoming a serious issue worldwide because of their harmful effects on the ecosystem and human health. Here we are reporting an extremely selective and cost-effective colorimetric sensor for simultaneous recognition of Hg and Pb by using green synthesized silver nanoparticles (AgNPs) mediated from the environmental friendly roots extract of . Biogenic synthesized AgNPs were well-characterized by various spectroscopic techniques e. Read More

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October 2020

Incursion and establishment of the Old World arbovirus vector Aedes (Fredwardsius) vittatus (Bigot, 1861) in the Americas.

Acta Trop 2021 Jan 4;213:105739. Epub 2020 Nov 4.

Walter Reed Biosystematics Unit, Museum Support Center MRC-534, Smithsonian Institution, 4210 Silver Hill Rd., Suitland MD 20746, USA; Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, MD 20910, USA; Department of Entomology, Smithsonian Institution - National Museum of Natural History, 10th St NE & Constitution Ave NE, Washington, DC 20002, USA. Electronic address:

Routine biosurveillance efforts at the Naval Station Guantanamo Bay, Cuba, on 18 June 2019, detected two unusual mosquitos in a CO-baited CDC light trap. Morphological and molecular analysis confirmed the presence of Aedes (Fredwardsius) vittatus (Bigot, 1861) - the first record of the Old World dengue, chikungunya, Zika and yellow fever virus vector into the Americas - and provides evidence for its establishment in Cuba. Newly submitted GenBank sequences from Dominican Republic further evidence its establishment in the Caribbean, and a median-joining network analysis using mitochondrial COI gene sequences clearly supports multiple introductions of Ae. Read More

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January 2021

Uptake of silver, gold, and hybrids silver-iron, gold-iron and silver-gold aminolevulinic acid nanoparticles by MCF-7 breast cancer cells.

Photodiagnosis Photodyn Ther 2020 Dec 4;32:102080. Epub 2020 Nov 4.

Institute of Environmental, Chemical and Pharmaceutical Sciences, Department of Physics, Federal University of Sao Paulo, Diadema, Sao Paulo, Brazil. Electronic address:

Background: Nanoparticles show promise for theranostic applications in cancer. The metal-based nanoparticles can be used both as photosensitizers and delivery vehicles. In bimetallic particles based on gold or silver and iron, a combination of the plasmonic features of the gold or silver components with the magnetic properties of the iron makes these hybrid nanomaterials suitable for both imaging and therapeutic applications. Read More

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December 2020

Target-triggered entropy-driven amplification system-templated silver nanoclusters for multiplexed microRNA analysis.

Biosens Bioelectron 2021 Jan 22;172:112757. Epub 2020 Oct 22.

School of Chinese Materia Medica, State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, Tianjin, 301617, PR China. Electronic address:

MicroRNAs (miRNAs) are important biomarkers for the diagnosis, prognosis, and treatment of human diseases. Sensitive and selective detection of multiple miRNAs simultaneously will greatly facilitate the early and accurate diagnosis of cancers. Herein, a novel entropy-driven amplification system-templated silver nanoclusters sensing platform was developed for the multiplexed analysis of tumor-associated miRNAs. Read More

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January 2021

An improvement in the coloration properties of Ag deposition-based plasmonic EC devices by precise control of shape and density of deposited Ag nanoparticles.

Nanoscale 2020 Dec 30;12(47):23975-23983. Epub 2020 Oct 30.

Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.

Ag nanoparticles exhibit various colors depending on their localized surface plasmon resonance (LSPR). Based on this phenomenon, Ag deposition-based electrochromic devices can represent various optical states in a single device such as the three primary colors (cyan, magenta, and yellow), silver mirror, black and transparent. A control of the morphology of Ag nanoparticles can lead to dramatic changes in color, as their size and shape influence the LSPR band. Read More

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December 2020

Rare earth element organotropism in European eel (Anguilla anguilla).

Sci Total Environ 2021 Apr 24;766:142513. Epub 2020 Sep 24.

Laboratory Mer, Molécules, Santé (MMS, EA 2160), University of Nantes, Nantes F-44322, France.

Rare earth elements (REEs) are metallic elements with electronic, magnetic, optical and catalytic properties which make them essential in many industrial and medical fields. REEs are therefore becoming emerging pollutants and it is important to understand their implications for ecosystem health. However, little knowledge of REE bioaccumulation in aquatic organisms is available and especially on their internal distribution in fish. Read More

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Highly sensitive, selective and naked-eye detection of bromide and bromate using distance-based paper analytical device.

Talanta 2021 Jan 8;221:121590. Epub 2020 Sep 8.

Applied Science & Engineering for Social Solution Unit, Faculty of Science, King Mongkut's University of Technology Thonburi, Prachautid Road, Thungkru, Bangkok, Thailand. Electronic address:

Bromine (Br) can usually be found as a bromide (Br‾) form contained in drinking water. Bromate (BrO‾) formation often occurred during the ozonation process in the presence of Br‾. BrO‾ is classified as a potential human carcinogen, so both the Br‾ and BrO‾ concentrations must be strictly controlled before and after an ozone-based treatment procedure, respectively. Read More

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January 2021

Colorimetric detection of Cr in dietary supplements using a smartphone based on EDTA and tannic acid-modified silver nanoparticles.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Feb 8;246:119050. Epub 2020 Oct 8.

Department of Chemistry, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23 Rd., Wattana, Bangkok 10110, Thailand. Electronic address:

A simplistic, portable and low-cost method for the rapid detection of Cr was developed based on a smartphone readout and a co-functionalized silver nanoparticles (AgNPs) system for use as an on-site device in resource-poor areas. The presence of Cr induced aggregation of AgNPs through coordinated complex formation between Cr and stabilizing agents on the NPs surface, resulted in a bright yellow of an AgNPs solution turned to wine red along with a SPR band was red-shifted from 429 nm to 625 nm. A smartphone with an available free application, called "PhotoMetrix" was used to measure the RGB (red, green, blue) values of the color intensities in the AgNPs system and convert into Cr concentration by using univariate calibration curves in less than 60s. Read More

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February 2021

Multi-Level Responses of Yellow Perch (Perca flavescens) to a Whole-Lake Nanosilver Addition Study.

Arch Environ Contam Toxicol 2020 Oct 15;79(3):283-297. Epub 2020 Oct 15.

Department of Biology, Lakehead University, Thunder Bay, ON, Canada.

Silver nanoparticles (AgNP) are widely used as antibacterial agents in both commercial products and for industrial applications. As such, AgNP has a high potential for release into freshwater environments. As part of a whole-lake ecosystem experiment to examine the impacts of AgNP exposure at low µg/L concentrations over multiple years, we evaluated biological responses in Yellow Perch (Perca flavescens) before, during, and after AgNP additions to a freshwater lake. Read More

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October 2020

Effects of Mulch Type, Plant Cultivar, and Insecticide Use on Sweet Potato Whitefly Population in Chili Pepper.

Scientifica (Cairo) 2020 28;2020:6428426. Epub 2020 Sep 28.

Faculty of Agriculture, Universitas Islam, Makassar 90245, South Sulawesi Province, Indonesia.

One of the most devastating pests of chili pepper is the sweet potato whitefly (SPW), (Gennadius) (Hemiptera: Aleyrodidae). It sucks plant sap, emits honeydew on which sooty mold fungi grow, and transmits the pepper yellow leaf curl Indonesia virus (PepYLCIV), the most damaging viral disease of chili in Indonesia. Farmers rely mainly on insecticide to control the insect with two to three sprays in a week. Read More

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September 2020

A high-throughput multiplex assay to characterize flavivirus-specific immunoglobulins.

J Immunol Methods 2020 12 3;487:112874. Epub 2020 Oct 3.

U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA; Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD 20817, USA.

Genus Flavivirus, which includes 53 virus species, is the leading cause of arthropod-borne diseases in humans. Diagnosis of these viral diseases is complicated by their overlapping epidemiology and clinical manifestations, and the fact that cross-reactive antibody responses are frequently elicited by individuals in response to infection. We developed a bead-based immunoassay to concomitantly profile the isotype and subclass of antibody responses (five isotypes and four subclasses) in parallel with specificity against multiple antigens. Read More

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December 2020