Search Results - "Hjálmarsdóttir, Martha Á"

Chitosan-hydroxycinnamic acid conjugates: Optimization of the synthesis and investigation of the structure activity relationship by Nagy, Vivien, Sahariah, Priyanka, Hjálmarsdóttir, Martha Á., Másson, Már

“…A new synthesis method was developed and optimized by a full factorial design for conjugating hydroxycinnamic acids (HCA-s) to chitosan. Cinnamic acid and…”
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The Effect of Molecular Weight on the Antibacterial Activity of N , N , N -Trimethyl Chitosan (TMC) by Sahariah, Priyanka, Cibor, Dorota, Zielińska, Dorota, Hjálmarsdóttir, Martha Á, Stawski, Dawid, Másson, Már

“…, , -trimethyl chitosan (TMC) with 93% degree of trimethylation was synthesized. TMC and the chitosan starting material were subjected to acidic hydrolysis to…”
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The antibacterial structure-activity relationship for common chitosan derivatives by Rathinam, Sankar, Solodova, Svetlana, Kristjánsdóttir, Ingibjörg, Hjálmarsdóttir, Martha Á., Másson, Már

“…The relationship between the degree of substitution and antibacterial activity was studied for six common chitosan derivatives N, N,N-trimethyl chitosan…”
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Selective synthesis of N,N,N-trimethylated chitosan derivatives at different degree of substitution and investigation of structure-activity relationship for activity against P. aeruginosa and MRSA by Rathinam, Sankar, Ólafsdóttir, Sigríður, Jónsdóttir, Sigríður, Hjálmarsdóttir, Martha Á., Másson, Már

“…Two new cationic chitosan derivatives were synthesized using a combination of Boc and TBDMS protection strategies. This included a series of six samples of the…”
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Chitotriazolan (poly(β(1-4)-2-(1H-1,2,3-triazol-1-yl)-2-deoxy-d-glucose)) derivatives: Synthesis, characterization, and evaluation of antibacterial activity by Rathinam, Sankar, Hjálmarsdóttir, Martha Á., Thygesen, Mikkel B., Másson, Már

“…Here we describe the first synthesis of a new type of polysaccharides derived from chitosan. In these structures, the 2-amino group on the pyranose ring was…”
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Synthesis of guanidinylated chitosan with the aid of multiple protecting groups and investigation of antibacterial activity by Sahariah, Priyanka, Óskarsson, Bjarni M., Hjálmarsdóttir, Martha Á., Másson, Már

“…•Guanidinylated chitosan derivatives were synthesized utilizing two different protecting groups.•Reactions in organic medium enabled quantitative…”
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Conjugation of CRAMP18–35 Peptide to Chitosan and Hydroxypropyl Chitosan via Copper-Catalyzed Azide–Alkyne Cycloaddition and Investigation of Antibacterial Activity by Rathinam, Sankar, Sørensen, Kasper K., Hjálmarsdóttir, Martha Á., Thygesen, Mikkel B., Másson, Már

“…We developed a synthesis strategy involving a diazo transfer reaction and subsequent click reaction to conjugate a murine cathelicidin-related antimicrobial…”
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Reduction of antimicrobial resistant pneumococci seven years after introduction of pneumococcal vaccine in Iceland by Hjálmarsdóttir, Martha Á, Haraldsson, Gunnsteinn, Quirk, Sigríður Júlía, Haraldsson, Ásgeir, Erlendsdóttir, Helga, Kristinsson, Karl G

“…Penicillin non-susceptible (PNSP) and multi-resistant pneumococci have been prevalent in Iceland since early nineties, mainly causing problems in treatment of…”
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Water-Soluble Quaternary and Protonable Basic Chitotriazolans: Synthesis by Click Chemistry Conversion of Chitosan Azides and Investigation of Antibacterial Activity by Rathinam, Sankar, Magdadaro, Romano, Hjálmarsdóttir, Martha Á, Másson, Már

“…The azide transfer reaction and copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) can be used to convert the amino groups in chitosan to triazole…”
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Effect of Vaccination on Pneumococci Isolated from the Nasopharynx of Healthy Children and the Middle Ear of Children with Otitis Media in Iceland by Quirk, Sigríður J, Haraldsson, Gunnsteinn, Erlendsdóttir, Helga, Hjálmarsdóttir, Martha Á, van Tonder, Andries J, Hrafnkelsson, Birgir, Sigurdsson, Samuel, Bentley, Stephen D, Haraldsson, Ásgeir, Brueggemann, Angela B, Kristinsson, Karl G

“…Vaccination with pneumococcal conjugate vaccines (PCVs) disrupts the pneumococcal population. Our aim was to determine the impact of the 10-valent PCV on the…”
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The Effect of the 10-Valent Pneumococcal Nontypeable Haemophilus influenzae Protein D Conjugate Vaccine on H. influenzae in Healthy Carriers and Middle Ear Infections in Iceland by Sveinsdóttir, Hildigunnur, Björnsdóttir, Jana Birta, Erlendsdóttir, Helga, Hjálmarsdóttir, Martha Á, Hrafnkelsson, Birgir, Haraldsson, Ásgeir, Kristinsson, Karl G, Haraldsson, Gunnsteinn

“…Vaccinations with the 10-valent pneumococcal conjugated vaccine (PHiD-CV) started in Iceland in 2011. Protein D (PD) from , which is coded for by the gene, is…”
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Comparison of Serotype Prevalence of Pneumococci Isolated from Middle Ear, Lower Respiratory Tract and Invasive Disease Prior to Vaccination in Iceland by Hjálmarsdóttir, Martha Á, Quirk, Sigríður Júlía, Haraldsson, Gunnsteinn, Erlendsdóttir, Helga, Haraldsson, Ásgeir, Kristinsson, Karl G

“…Information on pneumococcal serotype distribution before vaccination is a prerequisite for evaluation of vaccine effect. The aim was to investigate the…”
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Antibacterial properties of poly ( N , N -dimethylaminoethyl methacrylate) obtained at different initiator concentrations in solution polymerization by Stawski, Dawid, Rolińska, Karolina, Zielińska, Dorota, Sahariah, Priyanka, Hjálmarsdóttir, Martha Á, Másson, Már

“…The samples of poly( , -dimethylaminoethyl methacrylate) were synthesized by radical polymerization. The amount of monomer and solvent was constant as opposed…”
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Prevalence of pilus genes in pneumococci isolated from healthy preschool children in Iceland: association with vaccine serotypes and antibiotic resistance by Hjálmarsdóttir, Martha Á, Pétursdóttir, Brynhildur, Erlendsdóttir, Helga, Haraldsson, Gunnsteinn, Kristinsson, Karl G

“…The objective of this study was to investigate the prevalence of pilus islets [pilus islet 1 (PI-1) and pilus islet 2 (PI-2)] in pneumococcal isolates from…”
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Cocolonization of Pneumococcal Serotypes in Healthy Children Attending Day Care Centers: Molecular Versus Conventional Methods by Hjálmarsdóttir, Martha Á, Gumundsdóttir, Pálína Fanney, Erlendsdóttir, Helga, Kristinsson, Karl G, Haraldsson, Gunnsteinn

“…OBJECTIVES:Pneumococci are common colonizer, especially of children, and cocolonization of different serotypes is an important factor for intraspecies genetic…”
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Water-soluble chitotriazolans derived from cationic, neutral, and anionic common chitosan derivatives: Synthesis, characterization, and antibacterial activity by Rathinam, Sankar, Hjálmarsdóttir, Martha Á., Thygesen, Mikkel B., Másson, Már

“…[Display omitted] •Mixed chitotriazolan derivatives were synthesized from common cationic, neutral, and anionic chitosan derivatives.•The free amino groups in…”
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Vaccination of Icelandic Children with the 10-Valent Pneumococcal Vaccine Leads to a Significant Herd Effect among Adults in Iceland by Quirk, Sigríður J, Haraldsson, Gunnsteinn, Hjálmarsdóttir, Martha Á, van Tonder, Andries J, Hrafnkelsson, Birgir, Bentley, Stephen D, Haraldsson, Ásgeir, Erlendsdóttir, Helga, Brueggemann, Angela B, Kristinsson, Karl G

“…The introduction of pneumococcal conjugate vaccines (PCVs) into childhood vaccination programs has reduced carriage of vaccine serotypes and pneumococcal…”
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Soft Antimicrobial Agents:  Synthesis and Activity of Labile Environmentally Friendly Long Chain Quaternary Ammonium Compounds by Thorsteinsson, Thorsteinn, Másson, Már, Kristinsson, Karl G, Hjálmarsdóttir, Martha A, Hilmarsson, Hilmar, Loftsson, Thorsteinn

“…A series of soft quaternary ammonium antimicrobial agents, which are analogues to currently used quaternary ammonium preservatives such as cetyl pyridinium…”
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Cationic quaternized aminocalix[4]arenes: cytotoxicity, haemolytic and antibacterial activities by Ukhatskaya, Elena V., Kurkov, Sergey V., Hjálmarsdóttir, Martha A., Karginov, Vladimir A., Matthews, Susan E., Rodik, Roman V., Kalchenko, Vitaly I., Loftsson, Thorsteinn

“…This study reports the characterization of three cationic amphiphillic aminocalix[4]arenes as potential antimicrobial agents in vitro. In cytotoxicity tests on…”
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Impact of Chain Length on Antibacterial Activity and Hemocompatibility of Quaternary N‑Alkyl and N,N‑Dialkyl Chitosan Derivatives by Sahariah, Priyanka, Benediktssdóttir, Berglind E, Hjálmarsdóttir, Martha Á, Sigurjonsson, Olafur E, Sørensen, Kasper K, Thygesen, Mikkel B, Jensen, Knud J, Másson, Már

“…A highly efficient method for chemical modification of chitosan biopolymers by reductive amination to yield N,N-dialkyl chitosan derivatives was developed. The…”
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