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Reactive Attachment

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https://www.readbyqxmd.com/read/28445622/thiocarbohydrates-on-gold-nanoparticles-strong-influences-of-stereocenters-on-binding-affinitiy-and-interparticle-forces
#1
Torsten Linker, Prashant Pavashe, Werner Fudickar
Carbohydrates carrying thiol groups at the C-2 position have been attached to gold nanoparticles (AuNP) with stereocenters in close proximity to the surface for the first time. Their configurations can be clearly distinguished by the tendency of particle aggregation. AuNP surface plasmon resonance (SPR), x-ray photoelectron spectroscopy (XPS), and IR spectroscopy indicate that the thiocarbohydrates replace citrate molecules at different rates causing aggregation and eventually precipitation. A quantitative formulation of this aggregation process shows that reactivities can vary by several magnitudes...
April 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28444900/lactosylceramide-induced-phosphorylation-signaling-to-group-iva-phospholipase-a2-via-reactive-oxygen-species-in-tumor-necrosis-factor-%C3%AE-treated-cells
#2
Hiroyuki Nakamura, Yuta Moriyama, Kazuaki Watanabe, Satoshi Tomizawa, Risa Yamazaki, Hiromasa Takahashi, Toshihiko Murayama
The activity of α-type cytosolic phospholipase A2 (cPLA2 α, group IVA PLA2 ), which releases arachidonic acid (AA), is mainly regulated by the Ca(2+) -induced intracellular translocation/attachment of the enzyme to substrate membranes and its phosphorylation. We previously reported that tumor necrosis factor-α (TNFα) stimulated the formation of lactosylceramide (LacCer) in L929 fibroblast cells, and this lipid directly bound with and activated cPLA2 α [Nakamura et al., J. Biol. Chem. 2013;288:23264-23272]...
April 26, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28433055/pyrenyl-carbon-nanostructures-for-ultrasensitive-measurements-of-formaldehyde-in-urine
#3
Gayan Premaratne, Sabrina Farias, Sadagopan Krishnan
Measurement of ultra-low (e.g., parts-per-billion) levels of small-molecule markers in body fluids (e.g., serum, urine, saliva) involves a considerable challenge in view of designing assay strategies with sensitivity and selectivity. Herein we report for the first time an amperometric nano-bioelectrode design that uniquely combines 1-pyrenebutyric acid units pi-pi stacked with carboxylated multiwalled carbon nanotubes on the surface of gold screen printed electrodes for covalent attachment of NAD(+) dependent formaldehyde dehydrogenase (FDH)...
June 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28428548/antiviral-activities-of-schizonepeta-tenuifolia-briq-against-enterovirus-71-in-vitro-and-in-vivo
#4
Sin-Guang Chen, Mei-Ling Cheng, Kuan-Hsing Chen, Jim-Tong Horng, Ching-Chuan Liu, Shih-Min Wang, Hiroaki Sakurai, Yann-Lii Leu, Shulhn-Der Wang, Hung-Yao Ho
No effective drug is currently available for treatment of enterovirus 71 (EV71) infection. Schizonepeta tenuifolia Briq. (ST) has been used as a herbal constituent of traditional Chinese medicine. We studied whether the aqueous extract of Schizonepeta tenuifolia Briq (STE) has antiviral activity. STE inhibited replication of EV71, as evident by its ability to diminish plaque formation and cytopathic effect induced by EV71, and to inhibit the synthesis of viral RNA and protein. Moreover, daily single-dose STE treatment significantly improved the survival of EV71-infected mice, and ameliorated the symptoms...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28427269/spatially-selective-binding-of-green-fluorescent-protein-on-designed-organosilane-nanopatterns-prepared-with-particle-lithography
#5
Zachary L Highland, Jayne C Garno
A practical approach for preparing protein nanopatterns has been to design surface templates of nanopatterns of alkanethiols or organosilanes that will selectively bind and localize the placement of biomolecules. Particle lithography provides a way to prepare millions of protein nanopatterns with a few basic steps. For our nanopatterning strategy, organosilanes with methoxy and sulfhydryl groups were chosen as a surface template. Green fluorescent protein (GFP) was selected as a model for patterning. Areas of 2-[methoxy (polyethyleneoxy)6-9propyl]trichlorosilane (MPT-silane) are effective as a matrix for resisting the attachment of proteins, whereas nanopatterns with sulfur groups provide reactive sites for binding linker groups to connect proteins...
April 19, 2017: Biointerphases
https://www.readbyqxmd.com/read/28423053/-she-s-a-dog-at-the-end-of-the-day-guide-dog-owners-perspectives-on-the-behaviour-of-their-guide-dog
#6
Peter J Craigon, Pru Hobson-West, Gary C W England, Chantelle Whelan, Emma Lethbridge, Lucy Asher
A guide dog is a domestic dog (Canis familiaris) that is specifically educated to provide mobility support to a blind or visually impaired owner. Current dog suitability assessments focus on behavioural traits, including: trainability, reactivity or attention to environmental stimuli, low aggressiveness, fearfulness and stress behaviour, energy levels, and attachment behaviour. The aim of this study was to find out which aspects of guide dog behaviour are of key importance to guide dog owners themselves. Sixty-three semi-structured interview surveys were carried out with guide dog owners...
2017: PloS One
https://www.readbyqxmd.com/read/28419928/design-synthesis-and-biological-evaluation-of-3-substituted-2-oxindole-hybrid-derivatives-as-novel-anticancer-agents
#7
Romeo Romagnoli, Pier Giovanni Baraldi, Filippo Prencipe, Paola Oliva, Stefania Baraldi, Maria Kimatrai Salvador, Luisa Carlota Lopez-Cara, Roberta Bortolozzi, Elena Mattiuzzo, Giuseppe Basso, Giampietro Viola
The 2-oxindole nucleus is the central core to develop new anticancer agents and its substitution at the 3-position can effect antitumor activity. Utilizing a pharmacophore hybridization approach, a novel series of antiproliferative agents was obtained by the modification of the structure of 3-substituted-2-oxindole pharmacophore by the attachment of the α-bromoacryloyl moiety, acting as a Michael acceptor, at the 5-position of 2-oxindole framework. The impact of the substituent at the 3-position of 2-oxindole core on the potency and selectivity against a panel of seven different cancer cell lines was examined...
April 13, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28419652/degradation-mechanisms-of-the-ethylene-carbonate-diethyl-carbonate-mixture-studied-by-radiolysis
#8
Furong Wang, Fanny Varenne, Daniel Ortiz, Valentin Pinzio, Mehran Mostafavi, Sophie LE Caer
The reactivity of ethylene carbonate (EC) and of the ethylene carbonate/diethyl carbonate (DEC) mixture is studied under ionizing radiation in order to mimic aging phenomena occurring in lithium-ion batteries. Picosecond pulse radiolysis experiments show that the attachment of the electron on EC molecule is ultrafast (k(e-EC + EC) = 1.3  109 L mol-1 s-1 at 46°C). In the case of the 50/50 EC/DEC mixture, just after the electron pulse, the electron is solvated by a mixture of EC and DEC molecules, but its fast decay is attributed to the electron attachment on the EC molecule exclusively...
April 16, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28418667/colloid-facilitated-plutonium-transport-in-fractured-tuffaceous-rock
#9
Andrew Wolfsberg, Zhenxue Dai, Lin Zhu, Paul Reimus, Ting Xiao, Doug Ware
Colloids have the potential to enhance the mobility of strongly sorbing radionuclide contaminants in groundwater at underground nuclear test sites. This study presents an experimental and numerical investigation of colloid-facilitated plutonium transport in fractured porous media to identify plutonium reactive transport processes. The transport parameters for dispersion, diffusion, sorption, and filtration are estimated with inverse modeling by minimizing the least-squares objective function of multicomponent concentration data from multiple transport experiments with the shuffled complex evolution metropolis algorithm...
April 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28412510/empathy-networks-in-the-parental-brain-and-their-long-term-effects-on-children-s-stress-reactivity-and-behavior-adaptation
#10
Eyal Abraham, Gal Raz, Orna Zagoory-Sharon, Ruth Feldman
Parental empathy is a key component of sensitive parenting that supports children's social adaptation throughout life. Consistent with a two dissociable network perspective on empathy, we measured within- and between-network integrity of two empathy-related networks in the parental brain as predictors of children's social outcomes across the first six years of life. We focused on two empathy networks; embodied simulation, which supports parents' capacity to resonate with infant state and emotions and implicates cingulo-insulary structures, and mentalizing, which underpins parents' theory-of-mind and mental attributions via prefrontal-temporo-parietal circuit...
April 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28412066/ranibizumab-injection-as-primary-treatment-in-patients-with-retinopathy-of-prematurity-anatomic-outcomes-and-influencing-factors
#11
Qiujing Huang, Qi Zhang, Ping Fei, Yu Xu, Jiao Lyu, Xunda Ji, Jie Peng, Yi-An Li, Peiquan Zhao
PURPOSE: To investigate the anatomic outcomes and influencing factors of ranibizumab in the treatment of retinopathy of prematurity (ROP). DESIGN: Retrospective case series. PARTICIPANTS: A total of 283 eyes of 145 patients with type 1 ROP treated with intravitreal injection of ranibizumab (IVR) as primary treatment. METHODS: Retrospective review of infants who were diagnosed with type 1 ROP and accepted IVR (0.25 mg/0...
April 12, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28411638/approaches-for-conjugating-tailor-made-polymers-to-proteins
#12
Matthew Paeth, Jacob Stapleton, Melissa L Dougherty, Henry Fischesser, Jerry Shepherd, Matthew McCauley, Rebecca Falatach, Richard C Page, Jason A Berberich, Dominik Konkolewicz
A series of methods are outlined for attaching functional polymers to proteins. Polymers with good control over structure, functionality, and composition can be created using reversible addition-fragmentation chain transfer (RAFT) polymerization. These polymers can be covalently linked to enzymes and proteins using either the "grafting-to" approach, where a preformed polymer is attached to the protein surface, or the "grafting-from" approach, where the polymer is grown from the protein surface. Methods for grafting-to, or attaching the RAFT chain transfer agent to the protein surface outlined include the commonly used carbodiimide/activated ester (EDC/NHS) coupling...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28410194/chicoric-acid-is-a-potent-anti-atherosclerotic-ingredient-by-anti-oxidant-action-and-anti-inflammation-capacity
#13
Kun-Ling Tsai, Chung-Lan Kao, Ching-Hsia Hung, Yung-Hsin Cheng, Huei-Chen Lin, Pei-Ming Chu
Atherosclerotic cardiovascular disease is linked to both oxidative stress and endothelial cell dysfunction. Chicoric acid has antioxidant and anti-inflammatory properties. In the present investigation, we demonstrated that chicoric acid inhibits oxidized low-density lipoprotein (oxLDL)-facilitated dysfunction in human umbilical vein endothelial cells (HUVECs). Oxidative injuries were tested by investigating the formation of intracellular reactive oxygen species (ROS) and by examining the activity of antioxidant enzymes and the function of endothelial nitric oxide synthase (eNOS)...
March 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28403797/is-the-treatment-with-biological-or-non-biological-dmards-a-modifier-of-periodontal-condition-in-patients-with-rheumatoid-arthritis
#14
Consuelo Romero-Sanchez, Constanza Rodríguez, Pedro Santos, Ana María Mesa, Gloria Inés Lafaurie, Sebastian Giraldo, Juliette De Avila, Diana Marcela Castilla, Michelle Durán, Philippe Chalem, Juan Manuel Bello, Rafael Valle
BACKGROUND AND OBJECTIVE: Experimental models suggest the use of different therapy protocols in rheumatoid arthritis (RA) as modulators on periodontal condition. This study evaluated the effects of conventional drug treatment and anti-TNF therapy in patients with RA on microbiological and periodontal condition, establishing the association of markers of periodontal infection with indexes of rheumatic activity. MATERIALS AND METHODS: One hundred seventy nine individuals with RA were evaluated (62 with anti-TNF-α and 115 with only DMARDs)...
April 7, 2017: Current Rheumatology Reviews
https://www.readbyqxmd.com/read/28402172/rational-design-and-synthesis-of-affinity-matrices-based-on-proteases-immobilized-onto-cellulose-membranes
#15
Alberto Del Monte-Martínez, Jorge González-Bacerio, Bessy Cutiño-Avila, Jorge Rojas, Mae Chappé, Emir Salas-Sarduy, Isel Pascual, José M Guisán
Discovery of new protease inhibitors may result in potential therapeutic agents or useful biotechnological tools. Obtainment of these molecules from natural sources requires simple, economic and highly efficient purification protocols. The aim of this work was the obtainment of affinity matrices by the covalent immobilization of dipeptidyl peptidase IV (DPP-IV) and papain onto cellulose membranes, previously activated with formyl (FCM) or glyoxyl groups (GCM). GCM showed the highest activation grade (10.2 µmol aldehyde/cm(2))...
April 12, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28401844/signs-of-reactive-attachment-disorder-and-disinhibited-social-engagement-disorder-at-age-12-years-effects-of-institutional-care-history-and-high-quality-foster-care
#16
Kathryn L Humphreys, Charles A Nelson, Nathan A Fox, Charles H Zeanah
Two disorders of attachment have been consistently identified in some young children following severe deprivation in early life: reactive attachment disorder and disinhibited social engagement disorder. However, less is known about whether signs of these disorders persist into adolescence. We examined signs of reactive attachment disorder and disinhibited social engagement disorder at age 12 years in 111 children who were abandoned at or shortly after birth and subsequently randomized to care as usual or to high-quality foster care, as well as in 50 comparison children who were never institutionalized...
May 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28401840/methylation-matters-fk506-binding-protein-51-fkbp5-methylation-moderates-the-associations-of-fkbp5-genotype-and-resistant-attachment-with-stress-regulation
#17
Rosa H Mulder, Jolien Rijlaarsdam, Maartje P C M Luijk, Frank C Verhulst, Janine F Felix, Henning Tiemeier, Marian J Bakermans-Kranenburg, Marinus H Van Ijzendoorn
The parent-child attachment relationship plays an important role in the development of the infant's stress regulation system. However, genetic and epigenetic factors such as FK506 binding protein 51 (FKBP5) genotype and DNA methylation have also been associated with hypothalamus-pituitary-adrenal axis functioning. In the current study, we examined how parent-child dyadic regulation works in concert with genetic and epigenetic aspects of stress regulation. We study the associations of attachment, extreme maternal insensitivity, FKBP5 single nucleotide polymorphism 1360780, and FKBP5 methylation, with cortisol reactivity to the Strange Situation Procedure in 298 14-month-old infants...
May 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28401838/poverty-early-care-and-stress-reactivity-in-adolescence-findings-from-a-prospective-longitudinal-study-in-south-africa
#18
R M Pasco Fearon, Mark Tomlinson, Robert Kumsta, Sarah Skeen, Lynne Murray, Peter J Cooper, Barak Morgan
A considerable body of evidence suggests that early caregiving may affect the short-term functioning and longer term development of the hypothalamic-pituitary-adrenocortical axis. Despite this, most research to date has been cross-sectional in nature or restricted to relatively short-term longitudinal follow-ups. More important, there is a paucity of research on the role of caregiving in low- and middle-income countries, where the protective effects of high-quality care in buffering the child's developing stress regulation systems may be crucial...
May 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28401835/brain-activity-and-infant-attachment-history-in-young-men-during-loss-and-reward-processing
#19
Karina Quevedo, Theodore E A Waters, Hannah Scott, Glenn I Roisman, Daniel S Shaw, Erika E Forbes
There is now ample evidence that the quality of early attachment experiences shapes expectations for supportive and responsive care and ultimately serves to scaffold adaptation to the salient tasks of development. Nonetheless, few studies have identified neural mechanisms that might give rise to these associations. Using a moderately large sample of low-income male participants recruited during infancy (N = 171), we studied the predictive significance of attachment insecurity and disorganization at age 18 months (as measured in the Strange Situation Procedure) for patterns of neural activation to reward and loss at age 20 years (assessed during a reward-based task as part of a functional magnetic resonance imaging scan)...
May 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28396605/bypassing-adverse-injection-reactions-to-nanoparticles-through-shape-modification-and-attachment-to-erythrocytes
#20
Peter Pope Wibroe, Aaron C Anselmo, Per H Nilsson, Apoorva Sarode, Vivek Gupta, Rudolf Urbanics, Janos Szebeni, Alan Christy Hunter, Samir Mitragotri, Tom Eirik Mollnes, Seyed Moein Moghimi
Intravenously injected nanopharmaceuticals, including PEGylated nanoparticles, induce adverse cardiopulmonary reactions in sensitive human subjects, and these reactions are highly reproducible in pigs. Although the underlying mechanisms are poorly understood, roles for both the complement system and reactive macrophages have been implicated. Here, we show the dominance and importance of robust pulmonary intravascular macrophage clearance of nanoparticles in mediating adverse cardiopulmonary distress in pigs irrespective of complement activation...
April 10, 2017: Nature Nanotechnology
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