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Добірка наукової літератури з теми "Integrin with metal ions"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Integrin with metal ions"

1

Powell, J. J., R. Jugdaohsingh, and R. P. H. Thompson. "The regulation of mineral absorption in the gastrointestinal tract." Proceedings of the Nutrition Society 58, no. 1 (February 1999): 147–53. http://dx.doi.org/10.1079/pns19990020.

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The absorption of metal ions in the mammalian single-stomached gut is fortunately highly selective, and both luminal and tissue regulation occur. Initially, assimilation of metal ions in an available form is facilitated by the intestinal secretions, chiefly soluble mucus (mucin) that retards hydrolysis of ions such as Cu, Fe and Zn. Metal ions then bind and traverse the mucosally-adherent mucus layer with an efficiency M+> M2+> M3+. At the mucosa Fe3+is probably uniquely reduced to Fe2+, and all divalent cations (including Fe2+) are transported by a membrane protein (such as divalent cation transporter 1) into the cell. This minimizes absorption of toxic trivalent metals (e.g. A13+). Intracellular metal-binding molecules (such as mobilferrin) may be present at the intracellular side of the apical membrane, anchored to a transmembrane protein such as an integrin complex. This mobilferrin would receive the metal ion from divalent cation transporter 1 and, with part of the integrin molecule, transport the metal to the cytosol for safe sequestration in a larger complex such as ferritin or‘paraferritin’. β2-Microglobulin and HFE (previously termed human leucocyte antigen H) may be involved in stabilizing metal mobilferrin-integrin to form this latter complex. Finally, a systemic metal-binding protein such as transferrin may enter the antiluminal (basolateral) side of the cell for binding of the sequestered metal ion and delivery to the circulation. Regulatory proteins, such as HFE, may determine the degree of ion transport from intestinal cells to the circulation. Gradients in pH and perhaps pCa or even pNa could allow the switching of ions between the different transporters throughout this mechanism.
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2

Huang, Hao, Joel N. Bogstie, and Hans J. Vogel. "Biophysical and structural studies of the human calcium- and integrin-binding protein family: understanding their functional similarities and differences." Biochemistry and Cell Biology 90, no. 5 (October 2012): 646–56. http://dx.doi.org/10.1139/o2012-021.

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The human calcium- and integrin-binding protein 1 (CIB1) plays important roles in various cellular functions. In this study, three other members of this protein family (CIB2–4: CIB2, CIB3, and CIB4) were purified and subsequently characterized using biophysical and structural approaches. As expected from sequence alignments, CIB2–4 were shown to bind calcium (Ca2+) and magnesium (Mg2+) ions. Binding of Ca2+ or Mg2+ ions changes the secondary structure of CIB2–4 and the exposure of hydrophobic surface area. Ca2+ and Mg2+ ions also stabilize the tertiary structures for CIB2 and CIB3. Through in vitro binding experiments, we show that CIB2 can interact with the integrin αIIb cytoplasmic domain and the integrin α7b membrane-proximal fragment. Fluorescence experiments using a 7-azatryptophan labeled peptide demonstrate that CIB2, CIB3, and CIB4 are binding partners for the integrin αIIb subunit, which suggests that they are potentially involved in regulating integrin αIIb subunit activation. The distinct responses of αIIb to the different CIB3 and CIB4 metal (Ca2+ and Mg2+) binding states imply a potential connection between the calcium and integrin signaling pathways.
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3

Schumacher, Stephanie, Dirk Dedden, Roberto Vazquez Nunez, Kyoko Matoba, Junichi Takagi, Christian Biertümpfel та Naoko Mizuno. "Structural insights into integrin α5β1 opening by fibronectin ligand". Science Advances 7, № 19 (травень 2021): eabe9716. http://dx.doi.org/10.1126/sciadv.abe9716.

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Integrin α5β1 is a major fibronectin receptor critical for cell migration. Upon complex formation, fibronectin and α5β1 undergo conformational changes. While this is key for cell-tissue connections, its mechanism is unknown. Here, we report cryo–electron microscopy structures of native human α5β1 with fibronectin to 3.1-angstrom resolution, and in its resting state to 4.6-angstrom resolution. The α5β1-fibronectin complex revealed simultaneous interactions at the arginine-glycine-aspartate loop, the synergy site, and a newly identified binding site proximal to adjacent to metal ion–dependent adhesion site, inducing the translocation of helix α1 to secure integrin opening. Resting α5β1 adopts an incompletely bent conformation, challenging the model of integrin sharp bending inhibiting ligand binding. Our biochemical and structural analyses showed that affinity of α5β1 for fibronectin is increased with manganese ions (Mn2+) while adopting the half-bent conformation, indicating that ligand-binding affinity does not depend on conformation, and α5β1 opening is induced by ligand-binding.
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4

Ajroud, Kaouther, Takashi Sugimori, Wolfgang H. Goldmann, Dahmani M. Fathallah, Jian-Ping Xiong, and M. Amin Arnaout. "Binding Affinity of Metal Ions to the CD11b A-domain Is Regulated by Integrin Activation and Ligands." Journal of Biological Chemistry 279, no. 24 (April 7, 2004): 25483–88. http://dx.doi.org/10.1074/jbc.m402901200.

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5

Michalska, Agnieszka, Sebastian Golczak, Krzysztof Langer, and Jerzy Langer. "Micro- and Nanostructured Polyaniline for Instant Identification of Metal Ions in Solution." Nanomaterials 9, no. 2 (February 8, 2019): 231. http://dx.doi.org/10.3390/nano9020231.

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The unique properties of nanomaterials enable the creation new analytical devices. Polyaniline (PANI) micro- and nanofiber network, freestanding in the gap between two gold microelectrodes, has been used in a new nanodetector for metal ions in solutions. The gold electrodes were modified with the aid of alkanethiols, forming a self-assembled monolayer (SAM), which is able to block the ion current flow, but also to interact with metal ions when specific functional molecules are incorporated into the layer. The electric field of the trapped metal ions induces change of the electrical conductivity of polyaniline nanofibers in vicinity. A small injected sample (75 μL) of a solution of salt (about 0.5 μg of salt) was enough to induce a reproducible change in the electrical conductivity of polyaniline nano-network, which was registered as a function of time within 10–20 s. The response was proportional to the concentration of ions. It also depends on properties of ions, e.g., the ionic radius, which allows for identification of metal ions by analyzing the parameters of the signal: the retention time (RT), half width (HW), amplitude (A) and integral intensity (INT). The advantage of the new device is the instant responsiveness and easy operation, but also the simple construction based on organic (polymer) technology. The system is “open”—when learned and calibrated adequately, other metal ions can be analyzed. The nanodetector can be used in cases where monitoring of the presence and concentration of metal ions is important.
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6

Shamanin V.I. and Tarbokov V.A. "Multicharged metal ions generation in a self-magnetically insulated ion diode." Technical Physics Letters 49, no. 5 (2023): 63. http://dx.doi.org/10.21883/tpl.2023.05.56032.19507.

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A self-magnetically insulated ion diode was used to produce a pulsed beam of metallic ions from explosion emission plasma. The ratio of integral transferred charge for the Al, Ti and Mo ions amounted to at least 63% to the total beam charge. The ion diode had design features, which consisted in a bladed cathode and a removable perforated anode overlay made of VT-8 alloy. Analysis of the charge to mass characteristics of beam ions and the ion current density waveforms by the time of flight methodic with use of a Faraday cup showed the content of aluminum and titanium ions in the third to fourth states of ionization. Keywords: ion diode, metal ions, magnetic spectrometer, track detector CR-39.
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7

Kavitha, Govindarajan, Parasuraman Vijaya Rohini, and Sunkubangaru Sudarsan Alwar. "Potentiometric Studies of Binary Complexes of Transition Metal Ions with Lauric Acid." Oriental Journal of Chemistry 34, no. 5 (October 2, 2018): 2681–84. http://dx.doi.org/10.13005/ojc/340564.

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The potentials of binary complexes of the Lauric acid ligand with various biologically vital divalent metal ions such as Mn(II), Co(II), Ni(II), Cu(II)and Zn(II) have been studied in 50% DMSO-water mixture at constant ionic strength by Bjerrum method. Hydrogen ion concentrations were measured and the formation of binary complexes was inferred from the corresponding potentiometric pH-titration curves. The metal to ligand mole ratio was maintained at 1:5 to facilitate the maximum number of ligands to the metal ion. The dissociation constant has been determined by the half-integral method and pointwise method and were found in good agreement with each other. The Metal-Lauric acid stability constants have been calculated and compared with the results.
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8

Gupta, Neelmani, Murari Prasad, Nidhi Singhal, and Vineet Kumar. "Modeling the Adsorption Kinetics of Divalent Metal Ions onto Pyrophyllite Using the Integral Method." Industrial & Engineering Chemistry Research 48, no. 4 (February 18, 2009): 2125–28. http://dx.doi.org/10.1021/ie800975m.

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9

Singhal, Nidhi, Murari Prasad, Neelmani Gupta, and Vineet Kumar. "Modeling the sorption kinetics of divalent metal ions onto mineral adsorbent using integral method." Journal of Colloid and Interface Science 313, no. 2 (September 2007): 423–27. http://dx.doi.org/10.1016/j.jcis.2007.04.068.

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10

Kolmas, Joanna, Ewa Groszyk, and Dagmara Kwiatkowska-Różycka. "Substituted Hydroxyapatites with Antibacterial Properties." BioMed Research International 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/178123.

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Reconstructive surgery is presently struggling with the problem of infections located within implantation biomaterials. Of course, the best antibacterial protection is antibiotic therapy. However, oral antibiotic therapy is sometimes ineffective, while administering an antibiotic at the location of infection is often associated with an unfavourable ratio of dosage efficiency and toxic effect. Thus, the present study aims to find a new factor which may improve antibacterial activity while also presenting low toxicity to the human cells. Such factors are usually implemented along with the implant itself and may be an integral part of it. Many recent studies have focused on inorganic factors, such as metal nanoparticles, salts, and metal oxides. The advantages of inorganic factors include the ease with which they can be combined with ceramic and polymeric biomaterials. The following review focuses on hydroxyapatites substituted with ions with antibacterial properties. It considers materials that have already been applied in regenerative medicine (e.g., hydroxyapatites with silver ions) and those that are only at the preliminary stage of research and which could potentially be used in implantology or dentistry. We present methods for the synthesis of modified apatites and the antibacterial mechanisms of various ions as well as their antibacterial efficiency.
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Дисертації з теми "Integrin with metal ions"

1

Reinhard, Björn M. "Chemistry of microsolvated metal ions." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969739273.

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2

Phillips, Rosemary Helen. "Metal ions and Helicobacter pylori." Thesis, King's College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408125.

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3

Poteau, Xavier. "Fluorescent sensors for metal ions." Thesis, University of Central Lancashire, 2001. http://clok.uclan.ac.uk/21458/.

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The considerable current interest in the use of fluorescent molecules in molecular recognition is not new, but is one that has increased in importance in recent years due to their applications in many fields including trace analysis in chemistry and biochemistry. Using the "dual fluorescence" properties of TICT state compounds (Twisted Intramolecular Charge Transfer which gives an extra red-shifted emission band) and the key property of crown ether compounds which is their ability to complex ions, we designed and synthesised a range of new fluoroionophores and studied their photophysical behaviour towards a selection of alkaline and alkaline-earth metal ions. The new fluoroionophores (4-(i '-aza-4'-7'- 10 ,-i 3 '-tetraoxapentadecyl) benzonitrile, 4-( 1 '-aza-4'-7'- 10-i 3'-! 6'-pentaoxapentadecyl)benzonitrile, methyl-4- (1 '-aza-4'-7'-10'-13'-tetraoxapentadecyl)benzoate, 4'-N,N-(i "-aza-4",7",iO' ',l 3"- tetra oxapentadecyl)-3-hydroxyflavone and 4'-N,N-(l "-aza-4' ',7' ',lO", 13"- tetraoxapenta decyl)-3-methoxyflavone) have been shown to form TICT states upon excitation. The photophysics (absorption, emission, lifetimes) of these compounds are affected by the complexation of cations which reduce the donor character of the nitrogen belonging to the crown. The studied dications (Mg2 , Ca2 and Ba2') lead to larger spectral shifts and bigger values of the binding constant Ks than the studied monocations (Lie, Nat, K, CC) which can be interpreted in terms of a stronger electrostatic interaction between the nitrogen lone pair and the alkaline-earth metals than the alkali-metals. It appears that the selectivity demonstrated by these crown ethers towards the alkaline earth and alkali metals is not only explained by the "hole-size relationship" between the size of the crown ether cavity and the ionic mdii of the metal ions. The type of substituent on the phenyl of the azacrown ether has been shown to further influence the spectroscopic properties (shift of the absorption ansi emission bands). Nevertheless the photophysical properties of the azacrown ether derivatives studied does not show enhancement of the selectivity towards the studied metals on expansion of the delocalisation system. More complex mechanisms are in operation in flexible systems such as the azacrown derivatives used in this study geometry, conformation and rigidity all play roles in determining the binding strength and selectivity of these molecules.
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4

OGGIANU, MARIANGELA. "Luminescent platforms for metal ions sensing." Doctoral thesis, Università degli Studi di Cagliari, 2021. http://hdl.handle.net/11584/314054.

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This PhD thesis reports on the strategies for the design of novel luminescent chemosensors as valid alternative to conventional optical sensors, to recognize environmental pollutants, mainly heavy metal ions and nitroaromatics. Luminescent lab-on-chip platforms, molecular and Hybrid-based chemosensors, and luminescent Nanosheets are the three platforms developed for sensing applications. Fluorescent dyes of the family of Xhantenes, Rhodamine (RhO) and Fluorescein (Fluo), Diketopyrrolopyrroles (DPPs) and 2,5 -dihydroxy-1,4-benzoquinone derivatives are the old-fashioned and new building blocks selected, respectively, to fabricate these optical sensors, because of their unique luminescent properties. Particularly, 2,3-dicyano-5,6-dichloro-1,4-benzoquinone, was selected for its capability i) to produce two dimensional (2D) Coordination Polymers/Metal-Organic Frameworks (CPs/MOFs) and ii) to act as a good antenna ligand towards NIR and Vis. emitting Lanthanide ions. 2D CPs/MOFs, based on this linker, were obtained and miniaturized to 2D Nanosheets (NS), as challenging sensing platforms.
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5

Ebreo, Darren. "The role of metal ions in metal-on-metal total hip replacement." Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/59343/.

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Metal-on-metal (MoM) total hip replacement (THR) offered theoretical advantages of decreased wear and increased functional outcomes. MoM bearings have been associated with sterile inflammatory masses and significant soft tissue destruction with poorer outcomes following revision surgery. The natural history of adverse reactions to metal debris (ARMD) is unknown, but may represent contributions from bearing surface wear, taper junction wear, and corrosion. Immunological and genetic factors may influence susceptibility to development of ARMD. Between 1997 and 2004, 652 Ultima TPS THRs (DePuy) were implanted in 545 patients who went on to experience a high rate of early implant failure (13.8%). Management of these patients has evolved beyond regular clinical follow up with plain radiographs to include surveillance monitoring of trends in levels of blood metal ions and staging of disease using metal artefact reduction (MAR) MRI. This study investigated: • The natural history of ARMD in 28mm MoM THR using MAR MRI. • The possibility of diurnal variation of cobalt (Co) and chromium (Cr). • Differences in gene expression profiles of patients undergoing revision of a metal-on-polyethylene (MoP) THR for aseptic loosening and those with ARMD arising from MoM THR. In patients whose MARS MRI staging on initial scan is normal or where mild evidence of disease is demonstrated, further deterioration is unlikely. Where it does occur, the rate of deterioration is slow and there may be a latent period of many years. There is no diurnal variation in levels of cobalt (Co) in plasma or urine. There is diurnal variation in levels of plasma chromium, but this is not clinically significant. Patterns of gene expression in patients with aseptic loosening of a metal-onpolyethylene (MoP) THR, and patients with ARMD from a MoM THR investigated by a microarray experiment were found to be similar on a genome-wide level suggesting that they may share common factors in their aetiologies. These studies have helped to describe the natural history of ARMD on a cellular and radiological level, and have provided a contribution to the evidence base that will inform as to the optimum strategy for monitoring these patients before they develop catastrophic complications.
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6

Bale, Simon J. "Retention-modification in HPLC using metal ions." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/27578.

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The effects of transition metal ions as components of the mobile phase on the retentions in HPLC of 2-aminophenol and selected α-diketones were studied on both ODS-silica and porous polymer columns. The compounds were used as model compounds in an investigation which set out to derive a detailed understanding of the mechanisms Involved when metal ions are used to selectively modify the retention of compounds capable of interaction. This technique, which has parallels with ion-pair chromatography, provides another method by which the conditions of a separation may be altered and the selectivity adjusted to give better resolution.
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7

Ndifor-Angwafor, Nche George. "Analysis of metal ions in nanoparticle growth." Thesis, University of Bristol, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443661.

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8

Skipper, N. "The alkali metal ions in aqueous solutions." Thesis, University of Bristol, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379533.

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9

Irikura, Karl K. Beauchamp Jesse L. "Gas-phase chemistry of organotransition metal ions /." Diss., Pasadena, Calif. : California Institute of Technology, 1991. http://resolver.caltech.edu/CaltechETD:etd-06202007-111048.

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10

Cheng, Jing. "Characterisation of wool treated with metal ions." Thesis, Queensland University of Technology, 1993. https://eprints.qut.edu.au/227117/1/T%28S%29%2025_Cheng_1993.pdf.

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The importance and complexity of the interactions of metal ions with wool keratin have been well recognised. This work aims to add to the knowledge of these interactions and to demonstrate the application of chemometrics. A systematic study of wool fibres treated with lead metal ion was carried out using various instrumental analyses in an attempt to investigate the binding mechanism of the lead / wool interaction. The instrumental techniques applied included Fourier Transform Infrared (FT-IR) spectroscopy, transmission electron microscopy, energy dispersive X-ray microanalysis, scanning electron microscopy and X-ray photoelectron spectroscopy. It was shown that the carboxylate group acted as a binding site for the lead ion. The formation of lead sulfide as a result of lead / keratin interaction in the aqueous acidic solutions at elevated temperature was substantiated. Chemometrics was employed to reveal the trend for the IR spectra of lead treated wool samples with different treatment conditions. A comparative study was conducted for the wool keratin treated with Cr(III), Cu(II), Fe(II), Ni(II) and Zn(II) ions. The order of structure modification at the carboxyl group as a result of metal ion / wool interactions was obtained using FT-IR spectroscopy combined with chemometric methods (PCA, SIM CA and Fuzzy clustering). This order was found to contrast with the similar ranking on the basis of uptakes alone. The treatment solution pH changes were monitored to investigate the reaction schemes for metal / carboxyl group interactions. The reaction schemes were found to be related to the wool structure modification. FT-IR microscopic measurements of the untreated and metal ion treated single wool fibres qualitatively agreed with the results from normal FT-IR spectroscopy. The Forosyn dyed wool / polyester fabric blends which are concerned with metal - complex dyeing were analysed using diffuse reflectance FT-IR spectroscopy with the aid of chemometric interpretation. The object of this study was to attempt the matching and property prediction of these wool / polyester blends.
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Книги з теми "Integrin with metal ions"

1

Bhattacharya, Pabitra Krishna, and Prakash B. Samnani. Metal Ions in Biochemistry. 2nd edition. | Boca Raton : CRC Press, 2021. | Originally published: Metal ions in biochemistry / P.K. Bhattacharya. 2005.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003108429.

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2

Brown, Paul L., and Christian Ekberg, eds. Hydrolysis of Metal Ions. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527656189.

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3

J, Beveridge Terrance, and Doyle Ronald J, eds. Metal ions and bacteria. New York: Wiley, 1989.

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4

Wase, D. A. John, 1938- and Forster C. F, eds. Biosorbents for metal ions. London: Taylor & Francis, 1997.

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5

Günther, Winkelmann, and Winge Dennis R, eds. Metal ions in fungi. New York: M. Dekker, 1994.

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6

Astrid, Sigel, Sigel Helmut, and Sigel Roland K. O, eds. Neurodegenerative diseases and metal ions. Chichester, West Sussex, England: Wiley, 2006.

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7

Sigel, Astrid, Helmut Sigel, and Roland K. O. Sigel, eds. Neurodegenerative Diseases and Metal Ions. Chichester, UK: John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470028114.

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Linert, Wolfgang, and Henryk Kozlowski, eds. Metal Ions in Neurological Systems. Vienna: Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1001-0.

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9

Silver, Simon, and William Walden, eds. Metal Ions in Gene Regulation. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5993-1.

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10

Helmut, Sigel, and Sigel Astrid, eds. Metal ions in biological systems. New York: Marcel Dekker, 1996.

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Частини книг з теми "Integrin with metal ions"

1

Dugas, Hermann. "Metal Ions." In Springer Advanced Texts in Chemistry, 398–488. New York, NY: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-0324-4_6.

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2

Dugas, Hermann. "Metal Ions." In Springer Advanced Texts in Chemistry, 388–481. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-2426-6_6.

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3

Daniel, Joseph, and Hena Ziaee. "Metal Ions." In Modern Hip Resurfacing, 135–61. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84800-088-9_13.

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4

Wertz, John E., and James R. Bolton. "Transition-metal Ions. I." In Electron Spin Resonance, 258–312. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4075-8_11.

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Andraos, John, and Albert S. Matlack. "Toxic Heavy Metal Ions." In Introduction to Green Chemistry, 81–114. 3rd ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003033615-4.

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6

Bhattacharya, Pabitra Krishna, and Prakash B. Samnani. "Metal Complexes in Therapeutics." In Metal Ions in Biochemistry, 219–30. 2nd edition. | Boca Raton : CRC Press, 2021. | Originally published: Metal ions in biochemistry / P.K. Bhattacharya. 2005.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003108429-12.

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Kluge, H. J., H. Schnatz, and L. Schweikhard. "A Penning Trap for Studying Cluster Ions." In Metal Clusters, 89–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71571-6_14.

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Geusic, M. E., M. F. Jarrold, T. J. McIlrath, L. A. Bloomfield, R. R. Freeman, and W. L. Brown. "Photofragmentation of Mass Resolved Carbon Cluster Ions." In Metal Clusters, 209–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71571-6_29.

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9

Bhattacharya, Pabitra Krishna, and Prakash B. Samnani. "Structure of Cells and Introduction to Bioinorganic Chemistry." In Metal Ions in Biochemistry, 1–16. 2nd edition. | Boca Raton : CRC Press, 2021. | Originally published: Metal ions in biochemistry / P.K. Bhattacharya. 2005.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003108429-1.

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Bhattacharya, Pabitra Krishna, and Prakash B. Samnani. "Less Common Trace Metal Ions in Biochemical Systems." In Metal Ions in Biochemistry, 187–208. 2nd edition. | Boca Raton : CRC Press, 2021. | Originally published: Metal ions in biochemistry / P.K. Bhattacharya. 2005.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003108429-10.

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Тези доповідей конференцій з теми "Integrin with metal ions"

1

Kapnisis, Konstantinos, Dina Halwani, Brigitta Brott, Jack Lemons, Peter Anderson, and Andreas Anayiotos. "Biocorrosion and Biomechanical Analysis of Vascular Stents." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53378.

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Despite advances in endovascular stent design, stent structural integrity and in-stent restenosis remains a significant clinical problem worldwide. The role of stent corrosion and metallic ion release has not been thoroughly studied and little attention has been given to the interaction of stent materials with the surrounding vessel wall and the mechanical forces involved after implantation. Our recent studies on Stainless Steel (SS), Cobalt-Chromium (CoCr) and Nickel-Titanium (NiTi) stents obtained from a tissue retrieval resource from cadavers with accompanying clinical histories, have revealed that these stents undergo corrosion in vivo, with significant release of metallic ions into surrounding tissues [1]. It is believed that high concentrations of metal ions from stents are toxic to vascular smooth muscle cells [2] and stimulate both inflammatory and fibrotic reactions leading to neointimal formation and a predisposition to device failure [3]. When this is combined with altered biomechanics of flow and motion, it creates a favourable environment for the development of restenosis. To separate the mechanical effects from the local environmental effects on the stent surface, we performed in-vitro mechanical studies on various combinations of stents under low and high curvature and in overlapping positions to compare the results of fretting, pitting and gouging with the explanted stents.
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2

Kapnisis, Konstantinos, Dina Halwani, Brigitta Brott, Jack Lemons, Peter Anderson, and Andreas Anayiotos. "Stent Overlapping and Geometric Curvature Influence the Structural Integrity and Surface Characteristics of Coronary Stents." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80231.

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A common clinical practice in interventional procedures, is the deployment of two or more overlapping stents, especially in areas of branches and bifurcations where the stenotic area is diffuse and cannot be covered by a single stent or in the cases of treating long or recurrent lesions. However, complex in vivo conditions such as vessel tortuousity, high curvature, vascular wall stresses as well as blood flow wall shear stresses and diffuse calcification, may cause additional interactions within overlapping stents resulting in enhanced surface damage and fracture of stents. Preliminary studies have revealed that some stents undergo corrosion and fatigue-induced fracture in vivo, with significant release of metallic ions into surrounding tissues. A direct link between corrosion and in-stent restenosis has not been clearly established; nonetheless in vitro studies have shown that relatively high concentrations of heavy metal ions can stimulate both inflammatory and fibrotic reactions, which are the main steps in the process of restenosis. This study presents the outcome of in vitro accelerated biomechanical testing of Nitinol stents placed in mock arteries in single and overlapping configurations with various degrees of curvature. The effect of overlapping dissimilar materials was also investigated by testing multiple alloy stent combinations combining NiTi with CoCr or SS stents.
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3

Hooghan, K. N., K. S. Wills, P. A. Rodriguez, and S. J. O’Connell. "Integrated Circuit Device Repair Using FIB System: Tips, Tricks, and Strategies." In ISTFA 1999. ASM International, 1999. http://dx.doi.org/10.31399/asm.cp.istfa1999p0247.

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Abstract Device repair using Focused Ion Beam(FIB) systems has been in use for most of the last decade. Most of this has been done by people who have been essentially self-taught. The result has been a long learning curve to become proficient in device repair. Since a great deal of the problem is that documentation on this “art form” is found in papers from many different disciplines, this work attempts to summarize all of the available information under one title. The primary focus of FIB device repair is to ensure and maintain device integrity and subsequently retain market share while optimizing the use of the instrument, usually referred to as ‘beam time’. We describe and discuss several methods of optimizing beam time. First, beam time should be minimized while doing on chip navigation to reach the target areas. Several different approaches are discussed: dead reckoning, 3-point alignment, CAD-based navigation, and optical overlay. Second, after the repair areas are located and identified, the desired metal levels must be reached using a combination of beam currents and gas chemistries, and then filled up and strapped to make final connections. Third, cuts and cleanups must be performed as required for the final repair. We will discuss typical values of the beam currents required to maintain device integrity while concurrently optimizing repair time. Maintaining device integrity is difficult because of two potentially serious interactions of the FIB on the substrate: 1) since the beam consists of heavy metal ions (typically Gallium) the act of imaging the surface produces some physical damage; 2) the beam is positively charged and puts some charge into the substrate, making it necessary to use great care working in and around capacitors or active areas such as transistors, in order to avoid changing the threshold voltage of the devices. Strategies for minimizing potential damage and maximizing quality and throughput will be discussed.
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4

Fowles, Robert G., Simon J. M. Levey, and Clayton S. Smith. "An Advanced Method for Preparing Ferrous Sulfide and Testing Potential Inhibitors." In SPE International Oilfield Scale Conference and Exhibition. SPE, 2014. http://dx.doi.org/10.2118/spe-169808-ms.

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Abstract Ferrous-sulfide (iron II sulfide) scale typically forms in the wellbore under anaerobic conditions and may cause a reduction in well productivity. It has been proposed that ferrous ions react with bisulfide formed from dissolved hydrogen sulfide to form a complex iron bisulfide intermediate, which further reacts to produce black solid ferrous sulfide. Treatment of this type of scale typically involves mineral acids or chelants, which themselves provide additional challenges for pipeline integrity. The Weatherford flow assurance laboratory carries out tests that determine the best inhibitors for scale problems. Compared to calcite, barium, and gypsum scales, little work has been done to study prevention of ferrous sulfide scale. For calcite, barium, and gypsum scales, the dynamic-flow loop is commonly used. However, for ferrous-sulfide scale, there is a challenge for a quick and reliable test method. The preparation of ferrous sulfide under sour conditions is not straight forward due to both the difficulty in achieving sufficiently anaerobic conditions and the associated hazards of managing H2S. The presence of oxygen will result in ferric sulfide instead of ferrous sulfide. This paper describes in detail laboratory experiments to safely prepare ferrous sulfide scale using H2S and also test potential inhibitors. Comparisons were made between using metal sulfide instead of H2S. Using the H2S method to prepare ferrous sulfide provided a quick and robust way to select potential inhibitors under various conditions, which can be used to improve flow assurance assessments. This paper will demonstrate selected chemicals compared to tetrakis (hydroxymethyl) phosphonium sulfate (THPS) in preventing the formation of ferrous sulfide under sour conditions and ambient or elevated pressures and temperatures when applied at low concentrations. Some inhibitors that are successful under sour ferrous sulfide preparations are not effective when metal sulfide ions are used instead of H2S, which means potential inhibitors are being missed due to inappropriate test methods. Overall, a technological advancement was made with an anaerobic and sour method to test effectively ferrous sulfide inhibitors that would perform at low concentrations.
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5

GAJDA, Bernadeta. "EXTRACTION OF METAL IONS FROM SOLUTIONS AFTER LEACHING OF SPENT NiMH BATTERIES." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.944.

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6

Clark, P. E., M. Balakrishnan, and L. Sundram. "Crosslinking of Hydroxypropyl Guar With Metal Ions." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 1993. http://dx.doi.org/10.2118/25208-ms.

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7

Smith, Sheila, Martin Lopez, Olaf J. Rolinski, David J. S. Birch, and Mike Darbyshire. "Fluorescence energy transfer sensor for metal ions." In Photonics West '95, edited by Joseph R. Lakowicz. SPIE, 1995. http://dx.doi.org/10.1117/12.208475.

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Pavlov, Victor. "Solid state point emitters of metal ions." In 2014 20th International Workshop on Beam Dynamics and Optimization (BDO). IEEE, 2014. http://dx.doi.org/10.1109/bdo.2014.6890061.

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9

Isaev, A. A., S. V. Markova, G. G. Petrash, and K. I. Zemskov. "Negative ions in plasma of pulsed metal and metal compound vapour lasers." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthm5.

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Recently considerable improvement of characteristics of pulsed metal vapour and metal halide vapour lasers, such as copper vapour laser, CuBr-H2 and copper HyBrID laser, have been achieved. In [1,2] it was shown that this improvement can be qualitatively explained by the presence of HBr molecule. The influence of HBr can be explained by the process of dissociative attachment of electrons to this molecule which can lead to changes in the pulsed discharge development, recombination of plasma between excitation pulses and probably in electron energy distribution function.
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10

Yan, Jinhua. "Reinforced MFC aerogel for heavy metal ions separation." In 2016 5th International Conference on Advanced Materials and Computer Science (ICAMCS 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icamcs-16.2016.195.

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Звіти організацій з теми "Integrin with metal ions"

1

Morrison, Clyde A. Host Materials for Transition-Metal Ions. Fort Belvoir, VA: Defense Technical Information Center, September 1989. http://dx.doi.org/10.21236/ada213605.

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2

Bayley, Hagan, and Sean Conlan. Genetically Engineered Pores Sensing Metal Ions. Fort Belvoir, VA: Defense Technical Information Center, October 2000. http://dx.doi.org/10.21236/ada383413.

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3

Bayley, Hagan. Genetically Engineered Pores for Sensing Metal Ions. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada400504.

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4

Donald, Beck, R. Properties of Transition Metal Atoms and Ions. Office of Scientific and Technical Information (OSTI), March 2008. http://dx.doi.org/10.2172/925553.

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5

FLORENCE UNIV (ITALY). Metal Ions In Biological Systems. EUROBIC II. Fort Belvoir, VA: Defense Technical Information Center, January 1994. http://dx.doi.org/10.21236/ada338576.

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6

Lentz, Nicholas B. Electrospray Ionization Mass Spectrometry: From Cluster Ions to Toxic metal Ions in Biology. Office of Scientific and Technical Information (OSTI), January 2007. http://dx.doi.org/10.2172/933113.

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7

Veige, Adam. Linking Metal Ions via Inorganic Click (iClick) Reactions. Office of Scientific and Technical Information (OSTI), November 2015. http://dx.doi.org/10.2172/1226015.

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Glasgow, D. G., and E. B. Kennel. Separation of Metal Ions from Liquid Waste Streams. Office of Scientific and Technical Information (OSTI), December 2004. http://dx.doi.org/10.2172/876749.

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Cooper, Barbara H. Fundamentals of Metal Film Deposition With Hyperthermal Ions. Fort Belvoir, VA: Defense Technical Information Center, December 2000. http://dx.doi.org/10.21236/ada387858.

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10

Linkous, C., C. Shea, and M. Jaber. Direct insertion of metal ions into tetrasulfonated phthalocyanine. Office of Scientific and Technical Information (OSTI), July 1989. http://dx.doi.org/10.2172/5420957.

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