18 results match your criteria absorbs transforms

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Synergetic NH absorption properties of the NaBH-LiBH mixed system.

Chem Commun (Camb) 2021 Jun 2;57(49):6003-6006. Epub 2021 Jun 2.

Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan.

NaBH does not absorb NH below 100 kPa but transforms into a liquid state after NH absorption. On the other hand, LiBH absorbs NH at pressures lower than 100 kPa. Interestingly, mixed borohydrides absorbed NH at low pressures and were liquefied above 100 kPa due to a synergetic phenomenon. Read More

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Hydrochannel-Containing Hydrophobic Polymers by Inverse Emulsion Polymerization for Moisture-Driven Actuators.

ACS Appl Mater Interfaces 2020 Dec 23;12(49):55223-55230. Epub 2020 Nov 23.

Materials Science and Engineering Program, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093, United States.

Two physical properties in polymers, hydrophobic and water-absorptive, are known to be incompatible. However, human skin in nature has a hydrophobic surface and yet absorbs water throughout hydrophilic amino acid sequences in filaggrin, one of the abundant proteins in our outermost skin layer. Although present in nature, a hydrophilic path network in a hydrophobic polymer is difficult to synthesize because of poor wettability and immiscibility between the two types of materials. Read More

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December 2020

Performance Evaluation of a Piezoelectric Energy Harvester Based on Flag-Flutter.

Micromachines (Basel) 2020 Oct 14;11(10). Epub 2020 Oct 14.

Department of Mechanical and Aerospace Engineering (DIMA), Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy.

In the last few decades, piezoelectric (PZT) materials have played a vital role in the aerospace industry because of their energy harvesting capability. PZT energy harvesters (PEH) absorb the energy from an operational environment and can transform it into useful energy to drive nano/micro-electronic components. In this research work, a PEH based on the flag-flutter mechanism is presented. Read More

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October 2020

Biconcave Carbon Nanodisks for Enhanced Drug Accumulation and Chemo-Photothermal Tumor Therapy.

Adv Healthc Mater 2019 04 11;8(8):e1801505. Epub 2019 Mar 11.

Department of Materials Science and Engineering, University of Washington, Seattle, Washington, DC, 98195, USA.

It is considered a significant challenge to construct nanocarriers that have high drug loading capacity and can overcome physiological barriers to deliver efficacious amounts of drugs to solid tumors. Here, the development of a safe, biconcave carbon nanodisk to address this challenge for treating breast cancer is reported. The nanodisk demonstrates fluorescent imaging capability, an exceedingly high loading capacity (947. Read More

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Dopamine-mediated photothermal theranostics combined with up-conversion platform under near infrared light.

Sci Rep 2017 10 19;7(1):13562. Epub 2017 Oct 19.

Institute for Lasers, Photonics, and Biophotonics and Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York, 14260, United States.

An organic-inorganic hybrid core-shell nanostructure, based on mesoporous silica coated upconversion core-shell nanoparticles (NaGdF:Yb,[email protected]:[email protected] abbreviated here as [email protected]) that stably incorporates dopamine (Dopa) in the silica layer was introduced as a theranostic nanoplatform for optical imaging guided photothermal therapy (PTT) using NIR excitation. Silica-attaching polyethylenimine make the Dopa transforms into an active form (transferred Dopa) that strongly absorbs light under single 980 nm irradiation. We show that the activated [email protected] nanoplatform is able to produce a pronounced photothermal effect, that elevates water temperature from room temperature to 41. Read More

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October 2017

Multifunctional polymeric micelles loaded with doxorubicin and poly(dithienyl-diketopyrrolopyrrole) for near-infrared light-controlled chemo-phototherapy of cancer cells.

Colloids Surf B Biointerfaces 2017 Sep 3;157:398-406. Epub 2017 Jun 3.

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459. Electronic address:

Polymeric micelles loaded with multiple therapeutic modalities are important to overcome challenges such as drug resistance and improve the therapeutic efficacy. Here we report a new polymer micellar drug carrier that integrates chemotherapy and photothermal therapy in a single platform. Specifically, a narrow bandgap poly(dithienyl-diketopyrrolopyrrole) (PDPP) polymer was encapsulated together with a model anticancer drug doxorubicin (DOX) in the hydrophobic cores of polymeric micelles formed by Pluronic F127, an amphiphilic poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer. Read More

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September 2017

Hybrid biomaterials based on calcium carbonate and polyaniline nanoparticles for application in photothermal therapy.

Colloids Surf B Biointerfaces 2016 Sep 24;145:634-642. Epub 2016 May 24.

Departamento de Química CONICET y Tecnología Química, Universidad Nacional de Río Cuarto. Ruta 36km 601, Río Cuarto, Córdoba, 5800, Argentina. Electronic address:

Inorganic materials contain remarkable properties for drug delivery, such as a large surface area and nanoporous structure. Among these materials, CaCO3 microparticles (CMPs) exhibit a high encapsulation efficiency and solubility in acidic media. The extracellular pH of tumor neoplastic tissue is significantly lower than the extracellular pH of normal tissue facilitating the release of drug-encapsulating CMPs in this area. Read More

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September 2016

Strong Acid-Nonionic Surfactant Lyotropic Liquid-Crystalline Mesophases as Media for the Synthesis of Carbon Quantum Dots and Highly Proton Conducting Mesostructured Silica Thin Films and Monoliths.

Langmuir 2015 Sep 10;31(37):10265-71. Epub 2015 Sep 10.

Bilkent University , Department of Chemistry, 06800 Ankara, Turkey.

Lyotropic liquid-crystalline (LLC) materials are important in designing porous materials, and acids are as important in chemical synthesis. Combining these two important concepts will be highly beneficial to chemistry and material science. In this work, we show that a strong acid can be used as a solvent for the assembly of nonionic surfactants into various mesophases. Read More

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September 2015

Carboxymethyl cellulose wafers containing antimicrobials: a modern drug delivery system for wound infections.

Eur J Pharm Sci 2014 Jan 26;51:173-9. Epub 2013 Sep 26.

Centre for Drug Delivery Research, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia. Electronic address:

Lyophilised wafers have been shown to have potential as a modern dressing for mucosal wound healing. The wafer absorbs wound exudates and transforms into a gel, thus providing a moist environment which is essential for wound healing. The objective of this study was to develop a carboxymethyl cellulose wafer containing antimicrobials to promote wound healing and treat wound infection. Read More

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January 2014

Imaging outer segment renewal in living human cone photoreceptors.

Opt Express 2010 Mar;18(5):5257-70

Program in Vision Science, Indiana University, 800 East Atwater Avenue, Bloomington, IN 47405, USA.

In vertebrate eyes, vision begins when the photoreceptor's outer segment absorbs photons and generates a neural signal destined for the brain. The extreme optical and metabolic demands of this process of phototransduction necessitate continual renewal of the outer segment. Outer segment renewal has been long studied in post-mortem rods using autoradiography, but has been observed neither in living photoreceptors nor directly in cones. Read More

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The monoammoniate of lithium borohydride, Li(NH3)BH4: an effective ammonia storage compound.

Chem Asian J 2009 Jun;4(6):849-54

Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, United Kingdom.

Lithium borohydride absorbs anhydrous ammonia to form four stable ammoniates; Li(NH(3))(n)BH(4), mono-, di-, tri-, and tertraammoniate. This paper focuses on the monoammoniate, Li(NH(3))BH(4), which is readily formed on exposure of LiBH(4) to ammonia at room temperature and pressure. Ammonia loss from Li(NH(3))BH(4) commences around 40 degrees C and the compound transforms directly to LiBH(4). Read More

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Influences of calcium deficiency and cerium on the conversion efficiency of light energy of spinach.

Biometals 2008 Oct 11;21(5):553-61. Epub 2008 Apr 11.

Medical College of Soochow University, Suzhou 215123, P.R. China.

Chloroplast absorbs light energy and transforms it into electron energy, and then converts it into active chemical energy and stable chemical energy. In the present paper, we investigated the effects of Ce(3+), which has the most significant catalytic effects and similar characteristics with Ca(2+), on light energy conversion of spinach chloroplasts under Ca(2+)-deficient stress. The results illuminated that the Hill reaction activity, electron flow both photosystems and photophosphorylation rate of spinach chloroplasts reduced significantly under Ca(2+)-deficient condition, and activities of Mg(2+)-ATPase and Ca(2+)-ATPase on the thylakoid membrane were severely inhibited. Read More

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October 2008

Mechanism of hydrogenation reaction in the Li-Mg-N-H system.

J Phys Chem B 2005 Jun;109(21):10744-8

Materials Science Center, N-BARD, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.

The Li-Mg-N-H system composed of 3 Mg(NH2)2 and 8 LiH reversibly desorbs/absorbs approximately 7 wt % of H2 at 120-200 degrees C and transforms into 4 Li2NH and Mg3N2 after dehydrogenation. In this work, the mechanism of the hydrogenation reaction from 4 Li2NH and Mg3N2 to 8 LiH and 3 Mg(NH2)2 was investigated in detail. Experimental results indicate that 4 Li2NH is first hydrogenated into 4 LiH and 4 LiNH2. Read More

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Highly selective guest uptake in a silver sulfonate network imparted by a tetragonal to triclinic shift in the solid state.

Chemistry 2001 Dec;7(23):5176-82

Department of Chemistry, University of Calgary, Alberta, Canada.

The silver sulfonate network presented herein, silver 3-pyridinesulfonate, reversibly and selectively absorbs MeCN while undergoing a major structural rearrangement. The origin of this structural flexibility is a coupling of the weak coordinating ability of the SO3 group with the geometrically pliant silver(I) center. Single crystal and powder X-ray structures of both the desolvated and solvated forms are presented in addition to the mechanism of their reversible interconversion. Read More

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December 2001

Phototransformation of green fluorescent protein with UV and visible light leads to decarboxylation of glutamate 222.

Nat Struct Biol 2002 Jan;9(1):37-41

Laboratory of Molecular Biophysics, University of Oxford, The Rex Richards Building, South Parks Road, Oxford OX1 3QU, UK.

Wild type green fluorescent protein (GFP) from Aequorea victoria absorbs predominantly at 398 nm. Illumination with UV (254 nm) or visible (390 nm) light transforms this state (GFP(398)) into one absorbing at 483 nm (GFP(483)). Here we show that this photoconversion of GFP is a one-photon process that is paralleled by decarboxylation of Glu 222. Read More

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January 2002

Properties of a binaphthyl-bridged porphyrin-iron complex bearing hydroxy groups inside its cavity.

Chemistry 2001 Jul;7(13):2862-72

CNRS, Thiais, France.

Hydrogen-bond formation with the terminal oxygen atom is considered to be the basis of dioxygen molecule activation by cytochrome P450. In order to verify the effect of this hydrogen bond, we have undertaken the synthesis of a model complex: a binaphthyl-bridged porphyrin bearing hydroxy groups at suitable positions ("single coronet" or "SC"). The reactivity of the iron complex of the synthesized compound towards basic ligands, dioxygen and carbon monoxide has been studied. Read More

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Molecular dynamics study of the behavior of a single long chain polyethylene on a solid surface

Authors:
Guo Yang Li

Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 2000 Apr;61(4 Pt B):4185-93

Polymer Physics Laboratory, Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080 China.

A molecular dynamics simulation has been used in exploring the behavior of a single long chain polyethylene (PE) on a solid surface. We have established how varying the intermolecular (polymer-surface) van der Waals (vdW) interaction force effects the structural and dynamic properties of the polymer chain. For a high intermolecular vdW force, the starting PE chain absorbs on to solid surface, and develops into a stretched monolayerlike structure. Read More

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Reassessment of transillumination light scanning for the diagnosis of breast cancer.

Authors:

Health Technol Assess Rep 1988 (2):1-7

Transillumination light scanning is a non-x-ray, noninvasive modality that uses low-intensity emissions of red and near infrared light to visualize the tissues of the breast. The absorption characteristics of the emitted light from the breast tissues are fed into a computer that transforms the analog signals into varying degrees of color saturation hues, ranging from blue to red. The basic premise for the use of transillumination is that breast cancer, because of its increased blood supply, absorbs more near infrared radiation than benign tissue. Read More

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