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https://www.readbyqxmd.com/read/29161664/sandwich-type-biosensor-for-the-detection-of-%C3%AE-2-3-sialylated-glycans-based-on-fullerene-palladium-platinum-alloy-and-4-mercaptophenylboronic-acid-nanoparticle-hybrids-coupled-with-au-methylene-blue-mal-signal-amplification
#1
Qiqi Yuan, Junlin He, Yazhen Niu, Jun Chen, Yilin Zhao, Yuchan Zhang, Chao Yu
α2,3-sialylated glycans (α2,3-sial-Gs) are one of the significant tumour biomarkers for the early diagnosis of cancer. In this work, a neoteric sandwich-type biosensor was developed for detecting α2,3-sial-Gs using 4-mercaptophenylboronic acid (4-MPBA) to construct a novel molecular recognition system by the coordination of a boron atom of 4-MPBA to the amide group of Neu5Ac in the α2,3-sial-Gs structure. Amino-functionalized fullerene coupled with palladium-platinum bimetallic alloy nanocrystals (n-C60-PdPt) was synthesized to modify the surface of a glassy carbon electrode (GCE) because the n-C60 nanomaterial affords a large surface area for the on-site reduction of bimetallic alloy nanoparticles and an excellent capacity for electron transfer...
November 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29161646/antimicrobial-colloidal-hydrogels-assembled-by-graphene-oxide-and-thermo-sensitive-nanogels-for-cell-encapsulation
#2
Wenhua Cheng, Yunhua Chen, Lijing Teng, Bingheng Lu, Li Ren, Yingjun Wang
Hydrogels are promising 3D materials that have demonstrated increasing applications in the encapsulation and delivery of drugs and cells. Herein we report an injectable colloidal hydrogel that directly assembled by graphene oxide (GO) and thermo-sensitive nanogels (tNG). The pH dependent hydrogen bonding interactions between the carboxyl and oxethyl groups induce the reversible assembly of GO and nanogels. The hydrogel is mouldable and can be shaped into different macroscopic objects, and the mechanical strengths are tunable with pH and temperature adjustment...
November 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29160601/metalated-chromene-and-chromone-complexes-ph-switchable-metal-carbon-bonding-interaction-photo-triggerable-chromone-delivery-application-and-antioxidative-activity
#3
Sze-Wing Ng, Lai-Hon Chung, Chi-Fung Yeung, Hoi-Shing Lo, Hau-Lam Shek, Tian-Shu Kang, Chung-Hang Leung, Chun-Yuen Wong
The two families of Ru(II)-chromene and -chromone complexes isolated in this work represent the first examples of metalated chromene and chromone complexes synthesized through transition-metal mediated cyclization of phenol-tethered ynone. These unprecedented metalated heterocyclic compounds exhibit remarkable features, such as pH-switchable metal-carbon bonding interactions, photo-triggerable release of organic chromone upon visible-light irradiation, and superior antioxidative property to their organic analog (1,4-benzopyrone)...
November 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29160562/aqueous-extract-of-yellow-maca-lepidium-meyenii-improves-sperm-count-in-experimental-animals-but-response-depends-on-hypocotyl-size-ph-and-routes-of-administration
#4
L Sanchez-Salazar, G F Gonzales
Lepidium meyenii, a Peruvian plant growing over 4000 m.a.s.l., has effects on nutrition and fertility. The purpose of this study was to evaluate the sperm count in 105 male mice receiving boiled aqueous extract of yellow maca hypocotyls from different sizes, under different pH conditions and using two different routes of administration. Five mice per group were treated daily for 3 days with vehicle (oral and intraperitoneal) or maca aqueous extracts (5 mg/0.5 ml/day) belonging to the first, second, third and fourth categories, according to their hypocotyl size...
November 21, 2017: Andrologia
https://www.readbyqxmd.com/read/29159315/l-arginine-biosensors-a-comprehensive-review
#5
REVIEW
Neelam Verma, Ashish Kumar Singh, Minni Singh
Arginine has been considered as the most potent nutraceutics discovered ever, due to its powerful healing property, and it's been known to scientists as the Miracle Molecule. Arginine detection in fermented food products is necessary because, high level of arginine in foods forms ethyl carbamate (EC) during the fermentation process. Therefore, L-arginine detection in fermented food products is very important as a control measure for quality of fermented foods, food supplements and beverages including wine. In clinical analysis arginine detection is important due to their enormous inherent versatility in various metabolic pathways, topmost in the synthesis of Nitric oxide (NO) and tumor growth...
December 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/29159269/pulmonary-artery-dysfunction-in-chronic-thromboembolic-pulmonary-hypertension
#6
Hidetoshi Chibana, Nobuhiro Tahara, Naoki Itaya, Takashi Ishimatsu, Masahiro Sasaki, Motoki Sasaki, Takaharu Nakayoshi, Masanori Ohtsuka, Shinji Yokoyama, Ken-Ichiro Sasaki, Takafumi Ueno, Yoshihiro Fukumoto
Background: Unresolved thromboemboli in the pulmonary arteries (PA) is known to cause chronic thromboembolic pulmonary hypertension (CTEPH). However, it remains unknown if vascular dysfunction in pulmonary arteries exists in patients with CTEPH. Methods and results: We enrolled 7 female patients with CTEPH in this study, who have stable pulmonary hemodynamics after balloon pulmonary angioplasty (age; 73.6 ± 3.0 years old, mean right atrial pressure; 4.1 ± 0...
December 2017: IJC Heart & Vasculature
https://www.readbyqxmd.com/read/29159145/ph-responsive-cross-linked-polymeric-matrices-based-on-natural-polymers-effect-of-process-variables-on-swelling-characterization-and-drug-delivery-properties
#7
Fahad Naeem, Samiullah Khan, Aamir Jalil, Nazar Muhammad Ranjha, Amina Riaz, Malik Salman Haider, Shoaib Sarwar, Fareha Saher, Samrin Afzal
Introduction: The current work was aimed to design and synthesize novel crosslinked pH-sensitive gelatin/pectin (Ge/Pec) hydrogels using different polymeric ratios and to explore the effect of polymers and degree of crosslinking on dynamic, equilibrium swelling and in vitro release behavior of the model drug (Mannitol). Methods: The Ge/Pec based hydrogels were prepared using glutaraldehyde as the crosslinker. Various structural parameters that affect their release behavior were determined, including swelling study, porosity, sol-gel analysis, average molecular weight between crosslinks (Mc), volume fraction of polymer (V2,s), solvent interaction parameter (χ) and diffusion coefficient...
2017: BioImpacts: BI
https://www.readbyqxmd.com/read/29159144/thermoresponsive-graphene-oxide-starch-micro-nanohydrogel-composite-as-biocompatible-drug-delivery-system
#8
Mina Sattari, Marziyeh Fathi, Mansour Daei, Hamid Erfan-Niya, Jaleh Barar, Ali Akbar Entezami
Introduction: Stimuli-responsive hydrogels, which indicate a significant response to the environmental change (e.g., pH, temperature, light, …), have potential applications for tissue engineering, drug delivery systems, cell therapy, artificial muscles, biosensors, etc. Among the temperature-responsive materials, poly (N-isopropylacrylamide) (PNIPAAm) based hydrogels have been widely developed and their properties can be easily tailored by manipulating the properties of the hydrogel and the composite material...
2017: BioImpacts: BI
https://www.readbyqxmd.com/read/29158848/biodegradable-core-shell-dual-metal-organic-frameworks-nanotheranostic-agent-for-multiple-imaging-guided-combination-cancer-therapy
#9
Dongdong Wang, Jiajia Zhou, Ruohong Shi, Huihui Wu, Ruhui Chen, Beichen Duan, Guoliang Xia, Pengping Xu, Hui Wang, Shu Zhou, Chengming Wang, Haibao Wang, Zhen Guo, Qianwang Chen
Metal-organic-frameworks (MOFs) possess high porosity, large surface area, and tunable functionality are promising candidates for synchronous diagnosis and therapy in cancer treatment. Although large number of MOFs has been discovered, conventional MOF-based nanoplatforms are mainly limited to the sole MOF source with sole functionality. In this study, surfactant modified Prussian blue (PB) core coated by compact ZIF-8 shell (core-shell dual-MOFs, CSD-MOFs) has been reported through a versatile stepwise approach...
2017: Theranostics
https://www.readbyqxmd.com/read/29158843/ph-responsive-aerobic-nanoparticles-for-effective-photodynamic-therapy
#10
Lingyue Shen, Yu Huang, Dong Chen, Feng Qiu, Chuan Ma, Xin Jin, Xinyuan Zhu, Guoyu Zhou, Zhiyuan Zhang
RATIONALE: Photodynamic therapy (PDT), an O2-dependent treatment for inhibition of cancer proliferation, suffers from the low therapeutic effect in clinical application due to the hypoxic microenvironment in tumor cells. METHODS: To overcome this obstacle, a stimuli-responsive drug delivery system with O2 self-sufficiency for effective PDT was developed. In this study, pH-responsive aerobic nanoparticles were prepared by the electrostatic interaction between the O2-evolving protein Catalase and Chitosan...
2017: Theranostics
https://www.readbyqxmd.com/read/29158821/ultra-small-ph-responsive-nd-doped-nadyf4-nanoagents-for-enhanced-cancer-theranostic-by-in-situ-aggregation
#11
Yuxin Liu, Huimin Fan, Quanwei Guo, Anqi Jiang, Xiaoxia Du, Jing Zhou
To achieve accurate tumor location and highly efficient cancer therapy effect, the properties of cancer theranostic agents should be optimized and enhanced. In this work, ultra-small Nd doped NaDyF4 were firstly reported as novel contrast agents for near-infrared second window downconversion luminescence (NIR II DCL) and magnetic resonance imaging. Based on the optimization strategy, gallic acid-Fe(III) complex modified NaDyF4:10%Nd (NaDyF4:10%Nd-GA-Fe) was selected as the optimal agent with high transversal relaxivity, strong NIR II DCL, high photothermal conversion efficiency, and low toxicity...
2017: Theranostics
https://www.readbyqxmd.com/read/29158619/the-effect-of-mineral-based-alkaline-water-on-hydration-status-and-the-metabolic-response-to-short-term-anaerobic-exercise
#12
Jakub Chycki, Tomasz Zając, Adam Maszczyk, Anna Kurylas
Previously it was demonstrated that mineralization and alkalization properties of mineral water are important factors influencing acid-base balance and hydration in athletes. The purpose of this study was to investigate the effects of drinking different types of water on urine pH, specific urine gravity, and post-exercise lactate utilization in response to strenuous exercise. Thirty-six male soccer players were divided into three intervention groups, consuming around 4.0 l/day of different types of water for 7 days: HM (n=12; highly mineralized water), LM (n=12; low mineralized water), and CON (n=12; table water)...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158566/graphene-quantum-dots-for-cell-proliferation-nucleus-imaging-and-photoluminescent-sensing-applications
#13
Mukesh Kumar Kumawat, Mukeshchand Thakur, Raju B Gurung, Rohit Srivastava
We report a simple one-pot microwave assisted "green synthesis" of Graphene Quantum Dots (GQDs) using grape seed extract as a green therapeutic carbon source. These GQDs readily self-assemble, hereafter referred to as "self-assembled" GQDs (sGQDs) in the aqueous medium. The sGQDs enter via caveolae and clathrin-mediated endocytosis and target themselves into cell nucleus within 6-8 h without additional assistance of external capping/targeting agent. The tendency to self-localize themselves into cell nucleus also remains consistent in different cell lines such as L929, HT-1080, MIA PaCa-2, HeLa, and MG-63 cells, thereby serving as a nucleus labelling agent...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158537/medicinal-plant-leaf-extract-and-pure-flavonoid-mediated-green-synthesis-of-silver-nanoparticles-and-their-enhanced-antibacterial-property
#14
Siddhant Jain, Mohan Singh Mehata
The rewards of using plants and plant metabolites over other biological methods for nanoparticle synthesis have fascinated researchers to investigate mechanisms of metal ions uptake and bio-reduction by plants. Here, green chemistry were employed for the synthesis of silver nanoparticles (AgNPs) using leaf extracts of Ocimum Sanctum (Tulsi) and its derivative quercetin (flavonoid present in Tulsi) separately as precursors to investigate the role of biomolecules present in Tulsi in the formation of AgNPs from cationic silver under different physicochemical conditions such as pH, temperature, reaction time and reactants concentration...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158138/different-ecophysiological-responses-of-freshwater-fish-to-warming-and-acidification
#15
Tiago F Jesus, Inês C Rosa, Tiago Repolho, Ana R Lopes, Marta S Pimentel, Vera M F Almeida-Val, Maria M Coelho, Rui Rosa
Future climate change scenarios predict threatening outcomes to biodiversity. Available empirical data concerning biological response of freshwater fish to climate change remains scarce. In this study, we investigated the physiological and biochemical responses of two Iberian freshwater fish species (Squalius carolitertii and the endangered S. torgalensis), inhabiting different climatic conditions, to projected future scenarios of warming (+3°C) and acidification (ΔpH=-0.4). Herein, metabolic enzyme activities of glycolytic (citrate synthase - CS, lactate dehydrogenase - LDH) and antioxidant (glutathione S-transferase, catalase and superoxide dismutase) pathways, as well as the heat shock response (HSR) and lipid peroxidation were determined...
November 17, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/29156593/site-directed-mutagenesis-of-the-fibronectin-domains-in-insulin-receptor-related-receptor
#16
Igor E Deyev, Natalia A Chachina, Egor S Zhevlenev, Alexander G Petrenko
The orphan insulin receptor-related receptor (IRR), in contrast to its close homologs, the insulin receptor (IR) and insulin-like growth factor receptor (IGF-IR) can be activated by mildly alkaline extracellular medium. We have previously demonstrated that IRR activation is defined by its extracellular region, involves multiple domains, and shows positive cooperativity with two synergistic sites. By the analyses of point mutants and chimeras of IRR with IR in, we now address the role of the fibronectin type III (FnIII) repeats in the IRR pH-sensing...
November 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29156561/adsorptive-stripping-voltammetric-determination-of-amaranth-and-tartrazine-in-drinks-and-gelatins-using-a-screen-printed-carbon-electrode
#17
Yeny Perdomo, Verónica Arancibia, Olimpo García-Beltrán, Edgar Nagles
A fast, sensitive, and selective method for the simultaneous determination of one pair of synthetic colorants commonly found mixed in food products, Amaranth (AM) and Tartrazine (TZ), based on their adsorption and oxidation on a screen-printed electrode (SPE) is presented. The variation of peak current with pH, supporting electrolyte, adsorption time, and adsorption potential were optimized using square wave adsorptive voltammetry. The optimal conditions were found to be: pH 3.2 (PBS), Eads 0.00 V, and tads 30 s...
November 18, 2017: Sensors
https://www.readbyqxmd.com/read/29156337/facile-preparation-of-core-cross-linked-nanomicelles-based-on-graft-copolymers-with-ph-responsivity-and-reduction-sensitivity-for-doxorubicin-delivery
#18
Tiandong Chen, Yi Xiao, Wei Lu, Shiyuan Liu, Lin Gan, Jiahui Yu, Jin Huang
To achieve passive targeting and controlled drug release at tumor sites trigged by low pH value and high level of glutathione (GSH), optimized delivery system for doxorubicin (DOX) based on core cross-linked nanomicelles was developed in this research. Particularly, methoxypoly(ethylene glycol)-nitrophenyl carbonate (mPEG-NPC) and 3,4-dihydroxyphenylaceticacid were grafted onto synthesized poly(N,N'-cystamine bisacrylamide-N-Boc-1,2-diaminoethane) (poly(CBA-DAE)) to give methoxypoly(ethylene glycol)-g-poly(N,N'-cystamine bisacrylamide-N-Boc-1, 2-diaminoethane)-g-3, 4-dihydroxyphenylaceticacid (mPEG-g-SS-PCD-DA)...
November 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29155841/habitat-and-soil-related-drivers-of-the-root-associated-fungal-community-of-quercus-suber-in-the-northern-moroccan-forest
#19
Fatima Zahra Maghnia, Younes Abbas, Frédéric Mahé, Benaissa Kerdouh, Estelle Tournier, Mohamed Ouadji, Pierre Tisseyre, Yves Prin, Naïma El Ghachtouli, Salah Eddine Bakkali Yakhlef, Robin Duponnois, Hervé Sanguin
Soil fungi associated with plant roots, notably ectomycorrhizal (EcM) fungi, are central in above- and below-ground interactions in Mediterranean forests. They are a key component in soil nutrient cycling and plant productivity. Yet, major disturbances of Mediterranean forests, particularly in the Southern Mediterranean basin, are observed due to the greater human pressures and climate changes. These disturbances highly impact forest cover, soil properties and consequently the root-associated fungal communities...
2017: PloS One
https://www.readbyqxmd.com/read/29155716/evaluation-of-injury-induced-senescence-and-in-vivo-reprogramming-in-the-skeletal-muscle
#20
Coralie Cazin, Aurelie Chiche, Han Li
Cellular senescence is a stress response that is characterized by a stable cellular growth arrest, which is important for many physiological and pathological processes, such as cancer and ageing. Recently, senescence has also been implicated in tissue repair and regeneration. Therefore, it has become increasingly critical to identify senescent cells in vivo. Senescence-associated β-galactosidase (SA-β-Gal) assay is the most widely used assay to detect senescent cells both in culture and in vivo. This assay is based on the increased lysosomal contents in the senescent cells, which allows the histochemical detection of lysosomal β-galactosidase activity at suboptimum pH (6 or 5...
October 26, 2017: Journal of Visualized Experiments: JoVE
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