Surface plasmon resonance

In this work, gold nanorods (AuNRs) with well-controlled aspect ratios were prepared using a modified seedgrowth method and covered by TiO2 layers through the hydrothermal reaction to improve stability. Integrating TiO2 with plasmonic rod-like gold nanoparticles could enhance their photo activity by the local surface plasmon resonance (LSPR) effect. AuNRs aspect ratios were controlled by varying the amount of seed solution, reducing agents, surfactant (CTAB), and titanium (IV) but oxide.

7p dianmotminh02 03-05-2024 9 3   Download

This paper simulates an optical sensor utilizing a prism based on surface plasmon resonance (SPR). The simulations combine a layer of Au and an additional layer of different materials: aluminum arsenide (AlAs), poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), zinc oxide (ZnO), and polydimethylsiloxane (PDMS) for SPR excitation. The simulations show that a sensor based on a combination of Au/PEDOT:PSS layers with thicknesses of 40 nm and 5 nm, respectively, offers a sensor sensitivity of 186.07°/RIU, which is 1.2 times better than that of a sensor using only a thin Au layer.

12p nguaconbaynhay10 19-02-2021 8 1   Download

The interaction of blood coagulation factor X and its Gla-containing fragments with negatively charged phospholipid membranes composed of 25 mol% phosphatidylserine (PtdSer) and 75 mol% phosphatidylcholine (PtdCho) was studied by surface plasmon resonance. The binding to 100 mol% PtdCho membranes was negligible. The calcium dependence in the membrane binding was evaluated for intact bovine factor X (factor X) and the fragment containing the Gla-domain and the N-terminal EGF (epidermal growth factor)-like domain, Gla–EGFN, from factor X....

6p system191 01-06-2013 30 4   Download

Division of Medicinal and Natural Products Chemistry, Department of Chemistry and Department of Chemical Engineering, University of Iowa, USA; 2Department of Autoimmunology, Statens Serum Institut, Copenhagen, Denmark Synthetic peptides based on amino-acid residues 27–38 of human serum amyloid P component represent a novel type of heparin binders as they do not contain clusters of basic amino acids or other known features associated with protein or peptide heparin binding.

8p system191 01-06-2013 53 4   Download

The interaction between the c11ring and thececomplex, forming the rotor of theIlyobacter tartaricus ATP synthase, was probed by surface plasmon resonance spectroscopy andin vitro reconstitution analysis. The results pro-vide, for the first time, a direct and quantitative assessment of the stability of the rotor. The data indicated very tight binding between the c11ring and the cecomplex, with an apparent Kd value of approximately 7.4 nm.

13p research12 29-04-2013 46 3   Download

The catalytic activity of phenylalanine hydroxylase (PAH, phenylalanine 4-monooxygenase EC 1.14.16.1) is regulated by three main mechanisms, i.e. substrate (L-phenylalanine, L-Phe) activation, pterin cofactor inhibition and phos-phorylation of a single serine (Ser16) residue.To address the molecular basis for the inhibition by the natural cofactor (6R)-L-erythro-5,6,7,8-tetrahydrobiopterin, its effects on the recombinant tetrameric human enzyme (wt-hPAH) was studied using three different conformational probes, i.e.

10p tumor12 20-04-2013 34 3   Download

A library of random peptide sequences was used to select peptides that inhibit an anti-idiotypic catalytic Ig, immuno-globulin (IgG) 9G4H9, withab-lactamase-like activity. This library displays cyclic heptapeptides on the surface of bac-teriophagesand representsacollectionofupto4.5·10 9 peptides. The first selection step aimed at enriching the lib-rary in species that bind to the whole Ig molecule. The sec-ond stepwas todiscriminate peptides that bind topart of the molecule other than the active site. Selected peptides were then screened by surface plasmon resonance analysis.

7p fptmusic 16-04-2013 41 3   Download

Novel antithrombin molecules were identified from the ixodidae tick, Haemaphysalis longicornis. These molecules, named madanin 1 and 2, are 7-kDa proteins and show no significant similarities to any previously identified proteins. Assays using human plasma showed that madanin 1 and 2 dose-dependently prolonged both activated partial throm-boplastin time and prothrombin time, indicating that they inhibit both the intrinsic and extrinsic pathways. Direct binding assay by surface plasmon resonance measurement demonstrated that madanin 1 and 2 specifically interacted with thrombin....

9p fptmusic 16-04-2013 50 3   Download

Thrombomodulin (TM) slows down the interaction rate between thrombin and plasminogen activator inhibitor 1 (PAI-1). We now show that the 12-fold reduced inhibition rate in the presence ofTM does not result from an altered distribution between PAI-1 cleavage and irreversible com-plex formation. Surface plasmon resonance (SPR) revealed an over 200-fold reduced affinity of TM for thrombin-VR1 tPA as compared to thrombin, demonstrating the importance ofthe VR1 loop in the interaction ofthrombin withbothTMandPAI-1....

10p fptmusic 16-04-2013 42 3   Download

The enzymes pyruvate decarboxylase (E1) and dihydro-lipoyl dehydrogenase (E3) bind tightly but in a mutually exclusive manner to the peripheral subunit-binding domain (PSBD) of dihydrolipoyl acetyltransferase in the pyruvate dehydrogenase multienzyme complex of Bacillus stearo-thermophilus.

9p fptmusic 12-04-2013 43 2   Download

Recombinant human transcobalamin (TC) was probed with 17 monoclonal antibodies (mAbs), using surface plasmon resonance measurements. These experiments identified five distinct epitope clusters on the surface of holo-TC. Western blot analysis of the CNBr cleavage fragments of TC allowed us to distribute the epitopes between two regions, which spanned either the second quarter of the TC sequence GQLA…TAAM(103–198) or the C-ter-minal peptide LEPA…

12p fptmusic 11-04-2013 47 3   Download

The phosphoproteins HPrSerP and CrhP are the main effectors for CcpA-mediated carbon catabolite regulation (CCR) inBacillus subtilis. Complexes of CcpA with HPrSerP or CrhP regulate genes by binding to the catabolite responsive elements (cre). We present a quantitative analysis of HPrSerP and CrhP interaction with CcpA by surface plasmon resonance (SPR) revealing small and similar equilibrium constants of 4.8 ± 0.4 lm for HPrSerP–CcpA and 19.1 ± 2.5 lmfor CrhP–CcpA complex dissoci-ation.

12p awards 06-04-2013 39 2   Download

The binding characteristics of a series of PPARcligands (GW9662, GI 262570, cis-parinaric acid, 15-deoxy-D 12,14 -prostaglandin J2 , LY171883, indomethacin, linoleic acid, palmitic acid and troglitazone) to human PPARcligand binding domain have been investigated for the first time by using surface plasmon resonance biosensor technology, CD spectroscopyandmoleculardockingsimulation.

12p dell39 03-04-2013 39 4   Download

The interaction of antibodies (Abs) with protein antigens (Ags) of different size, such as hen egg white lysozyme, ovalbumin, and bovine serum albu-min, was examined using analytical ultracentrifugation, electrospray ioniza-tion time-of-flight mass spectrometry, and surface plasmon resonance in order to estimate regional and segmental Ab flexibility.

12p inspiron33 26-03-2013 40 4   Download

I C , an endogenous cytoplasmic inhibitor of vacuolar carboxypeptidase Y in the yeast Saccharomyces cerevisiae, is classified as a member of the phos-phatidylethanolamine-binding protein family. The binding of I C to phos-pholipid membranes was first analyzed using a liposome-binding assay and by surface plasmon resonance measurements, which revealed that the affin-

10p inspiron33 23-03-2013 42 4   Download

The topoisomerase I (TopI) reaction intermediate consists of an enzyme covalently linked to a nicked DNA molecule, known as a TopI-DNA complex, that can be trapped by inhibitors and results in failure of re-ligation. Attempts at new derivative designs for TopI inhibition are enthusiastically being pursued, and TopI inhibitors were developed for a variety of applications. Surface plasmon resonance (SPR) was recently used in TopI-inhibition studies.

9p toshiba23 18-11-2011 47 2   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Mapping of citrullinated fibrinogen B-cell epitopes in rheumatoid arthritis by imaging surface plasmon resonance...

10p thulanh15 21-10-2011 54 5   Download