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Acta Biomaterialia (7)10 2011
Abstract
Although Bioglass® has existed for nearly half a century its ability to trigger bone formation and tuneable degradability is vastly superior to other bioceramics, such as SiO(2)-CaO bioactive glasses. The sol-gel process of producing glass foams is well established for SiO(2)-CaO co...
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PMID: 21689791
PDF is available here.
PDF is available here.
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Abstract
Our investigations reveal that the structure and lateral ordering of the LPS molecules is very different from phospholipid systems and can be modulated by the ionic strength of the aqueous subphase in an ion-dependent manner. Our findings also indicate differential effects of monovalent and divalent...
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PMID: 21539784
PDF is available here.
PDF is available here.
Abstract
We propose the functionalization of MNPs via a two-steps strategy that takes advantage of the ionic reversible interactions between the Ab and the MNP. These interactions make possible the orientation of the Ab on the MNP surface before being attached in an irreversible way via covalent bonds. Three...
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PMID: 21526783
PDF is available here.
PDF is available here.
Abstract
A simple and rapid HPLC method with UV detection was developed for the separation of ciprofloxacin, levofloxacin and moxifloxacin. Chromatography was carried out using a BDS Hypersil C18 (100 x 4.6 mm, 2.4 microm) HPLC column and an isocratic mobile phase consisting of MeOH/25 mM pho...
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PMID: 21612150
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1808)9 2011
Abstract
We previously reported the existence of different TMEM16A isoforms generated by alternative splicing. In the present study, we have determined the functional properties of a minimal TMEM16A protein. This isoform, called TMEM16A(0), has a significantly shortened amino-terminus and lacks three alterna...
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PMID: 21645494
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1808)9 2011
Abstract
We studied an impact of visible light in combination with a photosensitizer on translocation of various substances across artificial (vesicular and planar) bilayer lipid membranes (BLMs). Along with induction of carboxyfluorescein leakage from liposomes, pronounced stimulation of lipid flip-flop bet...
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PMID: 21663731
PDF is available here.
PDF is available here.
Biopolymers (95)9 2011
Abstract
We applied Brownian dynamics methodology to study bimolecular association in the bacterial EF-G/70S ribosome system. We estimated the EF-G association rate constants at 150 and 300 mM monovalent ionic strengths and obtained reasonable agreement with kinetic experiments. We have also elucidated the d...
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PMID: 21394717
PDF is available here.
PDF is available here.
Abstract
We use a lattice Boltzmann based Brownian dynamics simulation to investigate the dependence of DNA thermophoresis on its interaction with dissolved salts. We find the thermal diffusion coefficient D_{T} depends on the molecule size, in contrast with previous simulations without electrostatics. The m...
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PMID: 21517533
PDF is available here.
PDF is available here.
Abstract
Dipeptidyl peptidase IV is an ectopeptidase with multiple physiological roles including the degradation of incretins, and a target of therapies for type 2 diabetes mellitus. Divalent cations can inhibit its activity, but there has been little effort to understand how they act. The in...
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PMID: 21093607
PDF is available here.
PDF is available here.
Abstract
Ferritin, a conserved iron storage protein of most living organisms, plays a crucial role in iron metabolism. In this study, the ferritin gene from Tegillarca granosa (denoted as TgFER) was identified by expressed sequence tag (EST) and PCR approaches. The full-length cDNA of TgFER was of 895bp, cons...
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PMID: 21349285
PDF is available here.
PDF is available here.
Abstract
We determined 1) how the spherical or rod shaped hydroxyapatite nanoparticles (nHA) incorporated poly( -caprolactone) (PCL) films (PCL-spherical nHA, PCL-rod nHA) interact with primary human osteoblasts (HOBs); 2) how the microenvironment rendered by their interaction affects osteogenic differentiat...
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PMID: 21306280
PDF is available here.
PDF is available here.
Abstract
Aminoglycoside antibiotics such as amikacin and tobramycin are the most commonly used treatment against Gram-negative bacterial infections. The widely used aminoglycosides have the unfortunate side-effect of targeting sensory hair cells of the inner ear, so that treatment often results in permanent h...
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PMID: 21796931
PDF is available here.
PDF is available here.
Abstract
We report the micellization, aggregation behavior and thermodynamics of a cationic surfactant viz. cetyltrimethylammonium bromide (CTAB) in absence and presence of tyrosine-hydantoin (TH) drug. The solution behavior of the mixture of CTAB and TH drug has been determined using conductivity, surface t...
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PMID: 20850280
PDF is available here.
PDF is available here.
Abstract
We have previously shown that besides its interaction with anionic lipids, the cyt c is also able to cross neutral lipid membranes. In this work, with the help of AFM and punch-through experiments, we have measured the force required to penetrate the membrane in the fluid and in the gel phases with...
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PMID: 20832261
PDF is available here.
PDF is available here.
Mutation Research (707)1-2 2011
Abstract
We demonstrate that miRNA expression levels can be altered after X-ray irradiation and that these miRNA are involved in chromatin remodeling and DNA methylation. A higher incidence of epigenetic changes was observed after exposure to X-rays than Fe ions even though Fe ions elicited more chromosomal...
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PMID: 21159317
PDF is available here.
PDF is available here.
Organic Letters (12)23 2010
Abstract
Benzene-cis- and trans-1,2-dihydrodiols undergo acid-catalyzed dehydration at remarkably different rates: k(cis)/k(trans) = 4500. This is explained by formation of a β-hydroxycarbocation intermediate in different initial conformations, one of which is stabilized by hyperconjugation...
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PMID: 21053960
PDF is available here.
PDF is available here.
Abstract
(Spectro-)electrochemical results demonstrate ligand-centred hydride ion-carrier capacity for a Rh(I) complex of a novel 'non-innocent' N-heterocyclic carbene ligand created by nicotinamide functionalisation.
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PMID: 20922240
PDF is available here.
PDF is available here.
Chemical Communications (46)42 2010
Abstract
We report an enzymatic sensor based on an organic electrochemical transistor that uses a room temperature ionic liquid as an integral part of its structure and as an immobilization medium for the enzyme and the mediator.
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PMID: 20871879
PDF is available here.
PDF is available here.
Abstract
We have examined the interatomic distances between metal ions and proposed key catalytic residues in the binding sites of seventeen type II restriction endonucleases whose crystal structures are documented in literature. The summary and critical evaluation of structural assignments and predictions m...
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PMID: 20888795
PDF is available here.
PDF is available here.
Abstract
Detailed analysis of >18 400 high-mass accuracy tandem mass spectra resulting from higher energy collisional dissociation yields further evidence of the cyclic nature of a(2)-ions.
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PMID: 20856953
PDF is available here.
PDF is available here.
Abstract
We used IRMPD spectroscopy and ion mobility spectrometry to assess whether i-motif structures were preserved in the gas phase. We first investigated the IRMPD spectral signature of the tetramer [dC(6)](4), which can only be formed via C-H(+)-C base pairing, compared to the single strand dC(6). The I...
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PMID: 20838693
PDF is available here.
PDF is available here.
Abstract
We investigate whether "supercharging" reagents able to shift the charge state distributions (CSDs) of electrosprayed protein ions upward also influence gas-phase protein structure. A differential mobility analyzer and a mass spectrometer are combined in series (DMA-MS) to measure the mass and mobil...
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PMID: 20877871
PDF is available here.
PDF is available here.
Abstract
Electrospray ionization produces phenylalanine (Phe) complexes of the alkali metal ion series, plus Ag(+) and Ba(2+). Infrared multiple photon dissociation (IRMPD) spectroscopy using the FELIX free electron laser light source is used to characterize the conformations of the ions, in conjunction with...
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PMID: 20820591
PDF is available here.
PDF is available here.
Abstract
We present an experimentally straightforward extension of ASAXS that can be used to count the number of ions around nucleic acids....
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PMID: 21047071
PDF is available here.
PDF is available here.
Abstract
Fruit of Zizyphus jujuba Mill, a traditional Chinese herb widely consumed in Asian countries, has been reported to possess several vital biological activities. This study intends to develop an appropriate analytical method for isolation of polysaccharides from Z. jujuba fruits and evaluate their ant...
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PMID: 20615429
PDF is available here.
PDF is available here.
Analyst (Cambridge UK) (135)11 2010
Abstract
A novel strategy for the determination of oxalate anions was successfully established using a copper ion and pyrocatechol violet (PV) ensemble. The sensor ensemble can discriminate oxalate over other common anions including F(-), Cl(-), I(-), Br(-), HPO(4)(2-), PO(4)(3-), AcO(-), CO(3)(2-), SO(4)(2-...
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PMID: 20877823
PDF is available here.
PDF is available here.
Analyst (Cambridge UK) (135)11 2010
Abstract
Fluorogenic based nitrobenzofuran-functionalized Ni@SiO(2) core/shell magnetic nanoparticles have been prepared by sol-gel grafting reaction. Their ability to detect and remove metal ions was evaluated by fluorophotometry. The nanoparticles exhibited a high affinity and selectivity for Cu(2+) over c...
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PMID: 20842293
PDF is available here.
PDF is available here.
Abstract
Simulations of the tetravalent group IV metal ions, Ge(IV), Sn(IV), and Pb(IV), in aqueous solution were performed using ab initio quantum mechanical charge field molecular dynamics (QMCF MD). The process of hydrolysis, which occurred for each of the metal ions, was analyzed in terms of the time evo...
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PMID: 20820570
PDF is available here.
PDF is available here.
Abstract
We present a first study of the effect of the surface on the secondary structures of peptides soft-landed onto self-assembled monolayer surfaces (SAMs). Conformations of soft-landed peptide ions were examined using a newly constructed instrument that enables in situ infrared reflection absorption sp...
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PMID: 20820593
PDF is available here.
PDF is available here.
New Phytologist (188)1 2010
Abstract
We labelled the tobacco cell line BY-2 and pollen tubes with a fluorescent derivative of phosphatidylcholine and assayed for patterns of fluorescently labelled products. Growth of pollen tubes was analysed. • We observed a significant decrease of labelled diacylglycerol (DAG) in cells treated with...
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PMID: 20629955
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
We have studied optical trapping and propulsion of red blood cells in the evanescent field of optical waveguides. Cell propulsion is found to be highly dependent on the biological medium and serum proteins the cells are submerged in. Waveguides made of tantalum pentoxide are shown to be efficient fo...
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PMID: 20941001
PDF is available here.
PDF is available here.
Abstract
I = 0.5 (NaClO(4)). The failure to detect significant catalysis by general acids of chlorine transfer from 1 to the nucleophile, together with the observed inverse solvent deuterium isotope effect on the hydronium ion-catalysed reaction (k(H)/k(D) = 0.37), indicates that this process occurs by proto...
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PMID: 20664852
PDF is available here.
PDF is available here.
Kidney International (78)10 2010
Abstract
Nanotechnology (21)36 2010
Abstract
We present an experimental demonstration of a synthetic nanoporous membrane suitable for charge-selective transport of ionic species. The surfaces and walls of synthetic nanochannels, fabricated in heavy ion-tracked polyethylene terephthalate membranes are negatively charged due to the presence of c...
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PMID: 20699482
PDF is available here.
PDF is available here.
Chemical Communications (46)34 2010
Abstract
The interactions of the metal ions Mg(2+), Zn(2+), Ni(2+), and Co(2+) with thin films of peptide nucleic acids (PNAs) were studied by electrochemical impedance spectroscopy (EIS), and the results show that Zn(2+), Ni(2+) and Co(2+) interacted favorably with the PNA film involving the backbone and th...
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PMID: 20680217
PDF is available here.
PDF is available here.
Abstract
Scanned ion beam delivery promises superior flexibility and accuracy for highly conformal tumour therapy in comparison to the usage of passive beam shaping systems. The attainable precision demands correct overlapping of the pencil-like beams which build up the entire dose distribution in the treatm...
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PMID: 20714044
PDF is available here.
PDF is available here.
Abstract
The triggering of Ca(2+) signaling pathways relies on Ca(2+)/Mg(2+) specificity of proteins mediating these pathways. Two homologous milk Ca(2+)-binding proteins, bovine alpha-lactalbumin (bLA) and equine lysozyme (EQL), were analyzed using the simplest "four-state" scheme of metal- and temperature-...
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PMID: 20602456
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
These results reveal that high-intensity blue, green, and white upconversion ASE fluorescences, which can be adopted for lighting in minimally invasive photodynamic therapy and minimally invasive surgery, are reasonable to be expected in rare-earth doped NZPGT glass fibers....
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PMID: 20940794
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
This paper reports the design analysis of a microfabricatable mid-infrared (mid-IR) surface plasmon resonance (SPR) sensor platform. The proposed platform has periodic heavily doped profiles implanted into intrinsic silicon and a thin gold layer deposited on top, making a physically flat grating SPR...
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PMID: 20940835
PDF is available here.
PDF is available here.
Meat Science (86)1 2010
Abstract
As myofibrils consist of a three-dimensional network of long, solid protein particles with the shortest dimension of less than 20 nm, the theoretical foundations of water-holding in meat should be studied from a colloid or surface chemistry point of view. The classical hypotheses for water-holding i...
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PMID: 20627421
PDF is available here.
PDF is available here.
Abstract
Acta Biomaterialia (6)9 2010
Abstract
Thermally induced phase separation (TIPS) has proven to be a suitable method for the preparation of porous structures for tissue engineering applications, and particular attention has been paid to increasing the pore size without the use of possible toxic surfactants. Within this con...
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PMID: 20350622
PDF is available here.
PDF is available here.
Chemical Communications (46)31 2010
Abstract
Under microwave radiation, Ag(+)-doped CdS semiconductor nanocrystals with high photoluminescence quantum yield (approximately 58%) and a surprisingly large optical window (480 to 630 nm) are formed controllably using a center-doping strategy and are optimized through a green approach in pure water...
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PMID: 20593082
PDF is available here.
PDF is available here.
Dental Materials Journal (29)4 2010
Abstract
The purpose of this study was to analyze the ions released from a surface pre-reacted glass ionomer (S-PRG) filler in distilled water or lactic acid solution. S-PRG filler was mixed with either solution at 1000:1, 100:1, 10:1, and 1:1 ratios by weight. By means of inductively coupled plasma atomic e...
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PMID: 20610878
PDF is available here.
PDF is available here.
Biophysical Journal (99)4 2010
Abstract
We studied the control parameters that govern the dynamics of in vitro DNA ejection in bacteriophage lambda. Previous work demonstrated that bacteriophage DNA is highly pressurized, and this pressure has been hypothesized to help drive DNA ejection. Ions influence this process by screening charges o...
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PMID: 20712993
PDF is available here.
PDF is available here.
Abstract
Ions are released from all metals after implantation in the body through processes of corrosive and mechanical wear. The aim of this study was to investigate whether serum metal ion levels are raised in patients following total knee arthroplasty. Serum levels of chromium, cobalt, alu...
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PMID: 20973359
PDF is available here.
PDF is available here.
Abstract
The internal hydrostatic pressure (turgor) of the filamentous fungus Neurospora crassa is regulated at about 400-500 kiloPascals, primarily by an osmotic MAP kinase cascade which activates ion uptake from the extracellular medium and glycerol synthesis. In the absence of hyperosmotic stress, the phe...
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PMID: 20546911
PDF is available here.
PDF is available here.
Abstract
The MS(n) spectra of the [M + H](+) and b(5) peaks derived from the peptides HAAAAA, AHAAAA, AAHAAA, AAAHAA, and AAAAHA have been measured, as have the spectra of the b(4) ions derived from the first four peptides. The MS(2) spectra of the [M + H](+) ions show a substantial series of b(n) ions with...
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PMID: 20541953
PDF is available here.
PDF is available here.
Bioresource Technology (101)15 2010
Abstract
Low-cost activated carbon was prepared from Polygonum orientale Linn. (PL) by phosphoric acid activation. Its ability to adsorb Pb(II) ions from aqueous solutions was examined. Through SEM, XRD, BET, and FTIR analyses, the PL-activated carbon (PLAC) was found to have a porous structure with a surfac...
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PMID: 20362430
PDF is available here.
PDF is available here.
Bioresource Technology (101)15 2010
Abstract
Spent grain (SG) was functionalized with thioglycolic acid in N,N-dimethylformamide (DMF) medium using sodium bisulfate monohydrate (NaHSO(4).H(2)O) as a catalyst, followed by treatment with sodium sulfide nonahydrate (Na(2)S.9H(2)O). Characterization of thiol-functionalized spent grain (TFSG) was p...
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PMID: 20338755
PDF is available here.
PDF is available here.
Abstract
The ZIP (ZRT-, IRT-like Protein) protein ZupT from Escherichia coli is a transporter with a broad substrate range. Phenotypic and transport analysis showed that ZupT, in addition to Zn(II), Fe(II) and Co(II) uptake, is also involved in transport of Mn(II) and Cd(II). Competition experiments with oth...
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PMID: 20225068
PDF is available here.
PDF is available here.
Electrophoresis (31)15 2010
Abstract
A glass microfluidic device is presented in which a microchannel is split into two regions with different electric fields by a nanochannel intermediate electrode junction formed by dielectric breakdown. The objective is to sink current through the nanochannel junction without sample loss or broadeni...
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PMID: 20665927
PDF is available here.
PDF is available here.
Abstract
We report that this hydrogen bonding pattern can be replaced by metal-ligation between specific metal ions and the natural bases. To demonstrate the feasibility of this principle, two linear oligonucleotides and silver ions were examined as models for DNA hybridization assay and adenosine triphospha...
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PMID: 20597497
PDF is available here.
PDF is available here.
Applied Spectroscopy (64)8 2010
Abstract
I = 0.1 M (NaCl/NaClO(4)), room temperature, and trace metal concentrations in the range of pH 2 to 8 using ultraviolet-visible (UV-Vis) and time-resolved laser-induced fluorescence spectroscopy (TRLFS). While complexation leads to a significant luminescence enhancement in the emission spectrum of t...
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PMID: 20719058
PDF is available here.
PDF is available here.
Analyst (Cambridge UK) (135)8 2010
Abstract
We show that this solid-contact ISE, which can be easily miniaturized, can be used directly in diluted real samples without any other pretreatment. The performance parameters of the new ISE include a Nernstian slope and excellent stability, good coefficients of selectivity, range of linearity (10(-5...
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PMID: 20532271
PDF is available here.
PDF is available here.
Abstract
We investigated PM(2.5) nitrite, nitrate, sulfate, chloride, sodium, ammonium, calcium, and magnesium ions using a URG 9000-D aerosol ion monitor with 1-h time-resolution and detection limit of 0.1 microg/m(3). The gas phase is separated from the aerosol phase with a liquid diffusion parallel-plate...
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PMID: 20819279
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (285)29 2010
Abstract
Apicomplexan parasites (including Plasmodium spp. and Toxoplasma gondii) employ a four-carbon pathway for de novo heme biosynthesis, but this pathway is distinct from the animal/fungal C4 pathway in that it is distributed between three compartments: the mitochondrion, cytosol, and apicoplast, a plas...
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PMID: 20442414
PDF is available here.
PDF is available here.
Biomedical Chromatography (24)12 2010
Abstract
The chromatographic behavior of model ions of biomedical and environmental significance was investigated by using nonionic micellar mobile phases modified with ion-pair additives. The influence of concentrations of polyoxyethylene (23) lauryl ether and ornithine hydrochloride in the mobile phase on...
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PMID: 20629040
PDF is available here.
PDF is available here.
Abstract
We investigate whether intrinsic defects in ice surface segregate. We predict that hydronium, hydroxide, and the Bjerrum L- and D-defects are all more stable at the surface. However, the energetic cost to create a D-defect at the surface and migrate it into the bulk crystal is smaller than its bulk...
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PMID: 20615938
PDF is available here.
PDF is available here.
Abstract
We investigated the effect of 5-HT on ion and fluid transport across the alveolar epithelium. 5-HT caused a dose-dependent inhibition of the amiloride-sensitive current across primary rat and human alveolar epithelial type II cell monolayers, but did not affect Na(+)/K(+) ATPase function. Furthermor...
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PMID: 19717814
PDF is available here.
PDF is available here.