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https://www.readbyqxmd.com/read/29149671/silver-nanoparticles-stimulate-the-proliferation-of-sulfate-reducing-bacterium-desulfovibrio-vulgaris
#1
Zhaoyu Chen, Ji Lu, Shu-Hong Gao, Min Jin, Philip L Bond, Ping Yang, Zhiguo Yuan, Jianhua Guo
The intensive use of silver nanoparticles (AgNPs) in cosmetics and textiles causes their release into sewer networks of urban water systems. Although a few studies have investigated antimicrobial activities of nanoparticles against environmental bacteria, little is known about potential impacts of the released AgNPs on sulfate reducing bacteria in sewers. Here, we investigated the effect of AgNPs on Desulfovibrio vulgaris Hidenborough (D. vulgaris), a typical sulfate-reducing bacterium (SRB) in sewer systems...
November 8, 2017: Water Research
https://www.readbyqxmd.com/read/29147738/novel-and-effective-synthesis-protocol-of-agnps-functionalized-using-l-cysteine-as-a-potential-drug-carrier
#2
Marek Wojnicki, Magdalena Luty-Błocho, Magdalena Kotańska, Magdalena Wytrwal, Tomasz Tokarski, Anna Krupa, Marcin Kołaczkowski, Adam Bucki, Marcin Kobielusz
In this study, the protocol of a single-step L-cysteine functionalized silver nanoparticle synthesis was described. Particle size distribution was determined. The crystallinity and chemical properties were investigated using XRD, HR-TEM, and XPS methods. Acute toxicity and irritant properties of obtained nanoparticles were studied using mice and rats as an animal model. The results showed that thanks to the applied protocol, it was possible to synthesize silver nanoparticles with narrow particle size distribution...
November 16, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29142316/sedentary-behavior-and-altered-metabolic-activity-by-agnps-ingestion-in-drosophila-melanogaster
#3
Akanksha Raj, Prasanna Shah, Namita Agrawal
Among several nanoparticles, silver nanoparticles (AgNPs) are extensively used in a wide variety of consumer products due to its unique antimicrobial property. However, dosage effect of AgNPs on behavior and metabolic activity in an in vivo condition is not well studied. Therefore, to elucidate the impact of AgNPs on behavior and metabolism, systematic and detailed dosages study of AgNPs was performed by rearing Drosophila melanogaster on food without and with AgNPs. We found that dietary intake of AgNPs at early larval stage leads to behavioral abnormalities such as poor crawling and climbing ability of larvae and adults respectively...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29136911/one-step-detection-for-two-serological-biomarker-species-to-improve-the-diagnostic-accuracy-of-hepatocellular-carcinoma
#4
Tao Gao, Jun Zhi, Chaoli Mu, Shiyu Gu, Jing Xiao, Jie Yang, Zhaoxia Wang, Yang Xiang
At present, the accuracy of clinical hepatocellular carcinoma (HCC) diagnosis needs to be further improved. In this work, two kinds of serological biomarker species, microRNA and protein biomarker, have been detected simultaneously to identify HCC. Herein, a dual-aptamer hairpin DNA oligonucleotide is designed as the electrochemical sensing probe (ESP) to achieve this goal. The hairpin-structured DNA probe consists microRNA-16 (miR-16) complementary sequence and alpha fetoprotein (AFP) aptamer sequence, so it can both capture miR-16 and AFP...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136856/nitrogen-dots-as-reductant-and-stabilizer-for-the-synthesis-of-agnps-n-dots-nanocomposites-for-efficient-surface-enhanced-raman-scattering-detection
#5
Zhenhua Lin, Jiani Yang, Zhijiao Tang, Gongke Li, Yuling Hu
A simple method was developed for the preparation of silver nanoparticles (AgNPs) by using amino-functionalized nitrogen dots (N-dots) as reductant and stabilizer under mild conditions. N-dots were hydrothermal synthesized using 2-azidoimidazole as the precursor in aqueous ammonia. The as prepared N-dots were rich in nitrogen and oxygen-containing functional groups and exhibit strong reducing capacity. Therefore, AgNPs were rapidly synthesized under mild conditions based on N-dots serving as the reducing agent, the reaction time and temperature were 5min and 40°C, respectively...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136848/convertible-dna-ends-based-silver-nanoprobes-for-colorimetric-detection-human-telomerase-activity
#6
Wenjing Chen, Lei Wang, Rong He, Xiaowen Xu, Wei Jiang
Human telomerase is an endogenous ribonucleoprotein that is over-expressed in most types of malignant cancer cells. Sensitive and specific detection of telomerase activity is crucial for better understanding its role in cancer cells and further exploring its function in cancer diagnosis. Here, we develop convertible DNA ends-based silver nanoprobes for sensitive and specific colorimetric detection telomerase activity. Silver nanoprobes are constructed by modifying telomerase binding substrates (TS) that are pre-hybridized with complementary sequences onto silver nanoparticles (AgNPs), via the coordination between consecutive cytosines in TS strand and AgNPs...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29132426/comment-on-a-re-assessment-of-the-safety-of-silver-in-household-water-treatment-rapid-systematic-review-of-mammalian-in-vivo-genotoxicity-studies
#7
EDITORIAL
Daniele Lantagne, Justine Rayner, Anjuliee Mittelman, Kurt Pennell
We wish to thank Fewtrell, Majuru, and Hunter for their article highlighting genotoxic risks associated with the use of particulate silver for primary drinking water treatment. The recent promotion of colloidal silver products for household water treatment in developing countries is problematic due to previously identified concerns regarding manufacturing quality and questionable advertising practices, as well as the low efficiency of silver nanoparticles to treat bacteria, viruses, and protozoa in source waters...
November 13, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29129431/ultra-rapid-catalytic-degradation-of-4-nitrophenol-with-ionic-liquid-recoverable-and-reusable-ibuprofen-derived-silver-nanoparticles
#8
Syeda Sara Hassan, Krista Carlson, Swomitra Kumar Mohanty, Sirajuddin, Ali Canlier
This study reports a one-pot and eco-friendly method for the synthesis of spherical ibuprofen derived silver nanoparticles (IBU-AgNPs) in aqueous media using ibuprofen analgesics drug as capping as well as reducing agent. Formation of AgNPs occurred within a few min (less than 5 min) at room temperature without resorting to any harsh conditions and hazardous organic solvents. Synthesized AgNPs were characterized with common analytical techniques. Transmission electron microscope (TEM) images confirmed the formation of spherical particles having a size distribution in the range of 12...
November 9, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29129328/insight-on-cytotoxic-effects-of-silver-nanoparticles-alternative-androgenic-transactivation-by-adsorption-with-dht
#9
Jae Soon Kang, June-Woo Park
Silver nanoparticles (AgNPs) are accumulated in the male reproductive organs for a long time and cause several adverse effects in there. Up to now, there is little of information for the cytotoxic effects in male reproductive cells. In this study, the stable AgNPs with a minimal silver ion (Ag(+)) dissolution below concentration inducing cytotoxicity in the cell medium were exposed to the human prostate carcinoma cell line 22Rv1. Moreover particle uptake and androgen receptor (AR) transactivation were evaluated...
November 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29126005/colorimetric-recognition-of-6-benzylaminopurine-in-environmental-samples-by-using-thioglycolic-acid-functionalized-silver-nanoparticles
#10
Mingda Zheng, Jiang He, Yingying Wang, Chenge Wang, Shuang Ma, Xiaohan Sun
A simple and selective colorimetric sensor thioglycolic acid capped silver nanoparticles (TGA-AgNPs) was developed for the detection of 6-benzylaminopurine (6-BAP). The synthesized TGA-AgNPs were characterized by UV-vis spectroscopy, dynamic light scattering (DLS), and transmission electron microscopic (TEM) techniques. The TGA-AgNPs as a sensor for binding 6-BAP through hydrogen-bonding and π-π bonding that causes large conjugate clusters, resulting in a color change from yellow to reddish orange. The surface plasmon resonance (SPR) band of TGA-AgNPs at 397nm is red-shifted to 510nm, which confirms that 6-BAP induces the aggregation of TGA-AgNPs...
October 31, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29124409/activated-carbon-fibers-thickly-overgrown-by-ag-nanohair-through-self-assembly-and-rapid-thermal-annealing
#11
Xuefeng Yan, Sijun Xu, Qiang Wang, Xuerong Fan
Anisotropic nanomaterial-modified carbon fibers attract increasing attention because of their superior properties over traditional ones. In this study, activated carbon fibers (ACFs) "thickly overgrown" by Ag nanohair were prepared through self-assembly and rapid thermal annealing. Viscose fibers with well-dispersed silver nanoparticles (AgNPs) on surfaces were first prepared through self-assembly of hyperbranched poly(amino-amine) (HBPAA)-capped AgNPs on viscose surfaces. HBPAA endowed the AgNP surfaces with negative charges and abundant amino groups, allowing AgNPs to monodispersively self-assemble to fiber surfaces...
November 9, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29123393/antioxidant-and-hepatoprotective-role-of-selenium-against-silver-nanoparticles
#12
Sabah Ansar, Saad M Alshehri, Manal Abudawood, Sherifa S Hamed, Tansir Ahamad
Silver nanoparticles (AgNPs) have attracted the most interest in terms of their potential biomedical and industrial applications. However, these nanoparticles have shown their toxic behavior toward environment, living tissues, and organisms. Selenium (Se), an essential trace element, is necessary for various metabolic processes, including protection against oxidative stress and immune function. The present study was undertaken to evaluate the effect of Se against AgNP-induced hepatic oxidative stress. AgNPs were synthesized and then prepared nanoparticles were characterized using various analytical techniques such as UV-visible spectroscopy, X-ray diffraction, and transmission electron microscopy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29122352/microbial-community-response-to-silver-nanoparticles-and-ag-in-nitrifying-activated-sludge-revealed-by-ion-semiconductor-sequencing
#13
Carley A Gwin, Emilie Lefevre, Christina L Alito, Claudia K Gunsch
Silver nanoparticles (AgNPs), which are known to act as biocides, are incorporated into medical and consumer products including athletic clothing, stuffed animals, liquid dietary supplements, and more. The increasing use of AgNPs in these products is likely to lead to their entry into both natural and engineered systems, which has the potential to disrupt bacterial processes including those involved in nutrient cycling in wastewater treatment. In the present study, sequencing batch reactors (SBR) mimicking secondary wastewater treatment were operated to determine the effects of AgNPs on the microbial communities contained within activated sludge of wastewater treatment plants (WWTP)...
November 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29121473/polyvinylidene-fluoride-micropore-membranes-as-solid-phase-extraction-disk-for-preconcentration-of-nanoparticulate-silver-in-environmental-waters
#14
Xiao-Xia Zhou, Yu-Jian Lai, Rui Liu, Shasha Li, Jing-Wen Xu, Jing-Fu Liu
Efficient separation and preconcentration of trace nanoparticulate silver (NAg) from large-volume environmental waters is a prerequisite for reliable analysis and therefore understanding the environmental processes of silver nanoparticles (AgNPs). Herein, we report the novel use of polyvinylidene fluoride (PVDF) filter membrane for disk-based solid phase extraction (SPE) of NAg in 1 L of water samples with the disk-based SPE system, which consists of a syringe pump and a syringe filter holder to embed the filter membrane...
November 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29114571/antioxidant-antibacterial-and-cytotoxic-potential-of-silver-nanoparticles-synthesized-using-terpenes-rich-extract-of-lantana-camara-l-leaves
#15
Patil Shriniwas P, Kumbhar Subhash T
Several attempts have been made for green synthesis of silver nanoparticles (AgNPs) using different plant extracts. Present study revealed that, antioxidant, antibacterial and cytotoxic AgNPs were synthesized using terpenes-rich extract (TRE) of environmentally notorious Lantana camara L. leaves. AgNPs were characterized by advanced techniques like UV-Visible and Infra red spectroscopy; XRD, SEM techniques as terpenes coated sphere shaped NPs with average diameter 425 nm. Further, on evaluation, AgNPs were found to exhibit dose - dependent antioxidant potential, good to moderate antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa; and toxicity on Brine shrimp (A...
July 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/29112930/how-the-interaction-of-pvp-stabilized-ag-nanoparticles-with-models-of-cellular-membranes-at-the-air-water-interface-is-modulated-by-the-monolayer-composition
#16
Rafael Leonardo Cruz Gomes da Silva, Heloiza Fernanda Oliveira da Silva, Luiz Henrique da Silva Gasparotto, Luciano Caseli
The antimicrobial property of silver nanoparticles (AgNPs) is believed to be associated to their interaction with biointerfaces such as microbial cell membranes, encouraging research on the identification of membrane sites capable of AgNPs binding. Although significant progress has been made in that regard, the exact molecular mechanism of action is yet to be fully understood. In this study, AgNPs dispersed in aqueous media and stabilized with polyvinylpyrrolidone were incorporated in Langmuir monolayers of selected lipids that served as cell membrane models...
October 26, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29112913/multifunctional-nanocomplex-for-surface-enhanced-raman-scattering-imaging-and-near-infrared-photodynamic-antimicrobial-therapy-of-vancomycin-resistant-bacteria
#17
Zilong Zhou, Shanshan Peng, Minghao Sui, Shiguang Chen, Lishi Huang, Hui Xu, Tingting Jiang
Since vancomycin (Van)-resistant enterococci (VRE) strains first emerged as a serious threat to public health, extensive studies focused on optical imaging and antimicrobial therapy have been performed for monitoring and microbiological control. In this study, we developed silicon 2,3-naphthalocyanine dihydroxide (Nc) and Van functionalized silica-encapsulated, silver-coated gold nanoparticles (Au@AgNP@SiO2@Nc-Van) as a novel theranostic system for surface-enhanced Raman scattering (SERS) detection and antimicrobial photodynamic therapy (aPDT) of VRE strains...
November 2, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29111869/biosynthesized-colloidal-silver-and-gold-nanoparticles-as-emerging-leishmanicidal-agents-an-insight
#18
Muhammad Ovais, Akhtar Nadhman, Ali Talha Khalil, Abida Raza, Fazli Khuda, Muhammad Farhan Sohail, Nazar Ul Islam, Hafiz Shoaib Sarwar, Gul Shahnaz, Irshad Ahmad, Muthupandian Saravanan, Zabta Khan Shinwari
Many recent key innovations in nanotechnology have greatly fascinated scientists to explore new avenues in treatment and diagnosis of emerging diseases. Due to extensive utilization of metallic nanoparticles (NPs) in diverse biomedical applications, scientists are looking forward to green synthesis of NPs as safer, simple, fast, and low-cost method over chemical and physical methods. Due to enriched phytochemistry, no need for maintenance and ready availability, plants are preferred for green synthesis of silver (AgNPs) and gold NPs (AuNPs)...
November 7, 2017: Nanomedicine
https://www.readbyqxmd.com/read/29111137/biogenic-silver-nanoparticles-inducing-leishmania-amazonensis-promastigote-and-amastigote-death-in-vitro
#19
Jacqueline Rodrigues Fanti, Fernanda Tomiotto-Pellissier, Milena Menegazzo Miranda-Sapla, Allan Henrique Depieri Cataneo, Célia Guadalupe Tardeli de Jesus Andrade, Carolina Panis, Jean Henrique da Silva Rodrigues, Pryscilla Fanini Wowk, Diogo Kuczera, Idessania Nazareth Costa, Celso Vataru Nakamura, Gerson Nakazato, Nelson Durán, Wander Rogério Pavanelli, Ivete Conchon-Costa
American Cutaneous Leishmaniasis (ACL) is a zoonosis caused by Leishmania protozoa. The ACL chemotherapy available is unsatisfactory motivating researches to seek alternative treatments. In this study, we investigated the action of biogenic silver nanoparticle (AgNp-bio) obtained from Fusarium oxysporium, against Leishmania amazonensis promastigote and amastigote forms. The AgNp-bio promastigote treatment results in promastigote death leading to apoptosis-like events due an increased production of reactive oxygen species (ROS), loss of mitochondrial integrity, phosphatidylserine exposure and damage on promastigotes membrane...
October 27, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29106689/effects-of-systematic-variation-in-size-and-surface-coating-of-silver-nanoparticles-on-their-in-vitro-toxicity-to-macrophage-raw-264-7-cells
#20
Sunday Makama, Samantha K Kloet, Jordi Piella, Hans van den Berg, Norbert C A de Ruijter, Victor F Puntes, Ivonne M C M Rietjens, Nico W van den Brink
In literature, varying and sometimes conflicting effects of physicochemical properties of NPs are reported on their uptake and effects in organisms. To address this, small and medium sized (20 and 50 nm) AgNPs with specified different surface coating/charges were synthesized and used to systematically assess effects of NP-properties on their uptake and effects in vitro. AgNPs were fully characterized for charge and size distribution in both water and test media. Macrophage cells (RAW 264.7) were exposed to these AgNPs at different concentrations (0 - 200 µg/mL)...
November 2, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
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