Search results for: Hans J. Griesser

Items from 1 to 20 out of 84 results

article

An Acid Test: Facile SI‐ARGET‐ATRP of Methacrylic Acid

Thomas D. Michl, Dimitri Jung, Andrea Pertoldi, Anna Schulte, more

Macromolecular Chemistry and Physics > 219 > 15 > n/a - n/a

Atom transfer radical polymerization (ATRP) of methacrylic acid (MAA) is challenging. Herein is reported a study of conditions for facile surface‐initiated ATRP by activator regenerated electron transfer (SI‐ARGET‐ATRP) growth of poly‐methacrylic acid (PMAA) chains from a plasma polymer surface bearing surface‐immobilized α‐bromoisobutyryl bromide, with no deoxygenation required. Factors that affect...

article

The importance of fungal pathogens and antifungal coatings in medical device infections

Carla Giles, Stephanie J. Lamont-Friedrich, Thomas D. Michl, Hans J. Griesser, more

Biotechnology Advances > 2018 > 36 > 1 > 264-280

In recent years, increasing evidence has been collated on the contributions of fungal species, particularly Candida, to medical device infections. Fungal species can form biofilms by themselves or by participating in polymicrobial biofilms with bacteria. Thus, there is a clear need for effective preventative measures, such as thin coatings that can be applied onto medical devices to stop the attachment,...

article

3D printed lattices as an activation and expansion platform for T cell therapy

Bahman Delalat, Frances Harding, Batjargal Gundsambuu, Elena M. De-Juan-Pardo, more

Biomaterials > 2017 > 140 > C > 58-68

One of the most significant hurdles to the affordable, accessible delivery of cell therapy is the cost and difficulty of expanding cells to clinically relevant numbers. Immunotherapy to prevent autoimmune disease, tolerate organ transplants or target cancer critically relies on the expansion of specialized T cell populations. We have designed 3D-printed cell culture lattices with highly organized...

article

Plasma Polymers Containing Sulfur and Their Co‐Polymers With 1,7‐Octadiene: Chemical and Structural Analysis

Kim S. Siow, Leanne Britcher, Sunil Kumar, Hans J. Griesser

Plasma Processes and Polymers > 14 > 3 > n/a - n/a

In comparison with other chemistries, little has been reported on sulfur‐containing plasma polymers; reasons include low volatility or high toxicity of monomers. Here, we report on plasma polymerization of dimethyl sulfoxide, by itself and its co‐polymerization with 1,7‐octadiene to generate S‐containing plasma polymers. Results show dominance of SS, SH, and SC with small percentages of SO and...

article

Effects of Precursor and Deposition Conditions on Prevention of Bacterial Biofilm Growth on Chlorinated Plasma Polymers

Thomas D. Michl, Bryan R. Coad, Amanda Hüsler, Jules D. P. Valentin, more

Plasma Processes and Polymers > 13 > 6 > 654 - 662

In this work, we aimed to understand the key properties that confer antibacterial activity to chlorinated plasma polymers, by investigating plasma polymers deposited from a series of chlorinated precursor molecules and also investigating the effect of plasma conditions. Results revealed that only precursors with a Cl/C ratio ≥1.5 generate effective antibacterial coatings, whereas the coating thickness...

article

Antibacterial constituents of Eremophila alternifolia: An Australian aboriginal traditional medicinal plant

Israt J. Biva, Chi P. Ndi, Hans J. Griesser, Susan J. Semple

Journal of Ethnopharmacology > 2016 > 182 > C > 1-9

For traditional medicinal purposes Aboriginal Australians have utilised numerous plant species, Eremophila alternifolia is among the most prominent. Traditionally, fresh leaves, leaf-infusions and handmade leaf-pastes have been used as both external and internal preparations to provide relief from a variety of conditions. Preparations of the species have been used to treat various infections of skin,...

article

Influence of Tetramethyldisiloxane‐Oxygen Mixtures on the Physical Properties of Microwave PECVD Coatings and Subsequent Post‐Plasma Reactions

Colin J. Hall, Peter J. Murphy, Hans J. Griesser

Plasma Processes and Polymers > 12 > 6 > 555 - 563

Coatings deposited by microwave plasma enhanced CVD have potential for applications as protective coatings against mechanical and environmental damage. The properties of plasma polymer coatings can, however, vary markedly with deposition conditions, and we report here that this is also the case for coatings deposited from mixtures of tetramethyldisiloxane (TMDSO) and oxygen. Hardness, modulus, stress,...

article

Advanced biopolymer-coated drug-releasing titania nanotubes (TNTs) implants with simultaneously enhanced osteoblast adhesion and antibacterial properties

Tushar Kumeria, Htwe Mon, Moom Sinn Aw, Karan Gulati, more

Colloids and Surfaces B: Biointerfaces > 2015 > 130 > C > 255-263

Here, we report on the development of advanced biopolymer-coated drug-releasing implants based on titanium (Ti) featuring titania nanotubes (TNTs) on its surface. These TNT arrays were fabricated on the Ti surface by electrochemical anodization, followed by the loading and release of a model antibiotic drug, gentamicin. The osteoblastic adhesion and antibacterial properties of these TNT–Ti samples...

article

Laboratory Scale Systems for the Plasma Treatment and Coating of Particles

Thomas D. Michl, Bryan R. Coad, Amanda Hüsler, Krasimir Vasilev, more

Plasma Processes and Polymers > 12 > 4 > 305 - 313

We here report two reactor designs for the efficient and uniform plasma treatment of particles: 1) retrofitting an existing plasma reactor with a loudspeaker for agitation (LPR) and 2) adapting a rotary evaporator by adding custom electrodes (RPR). Both designs offer versatility, low building cost, convenience of use, flexibility, facile vacuum sealing and achieve effective agitation and coating of...

article

Compounds from Geijera parviflora with prostaglandin E2 inhibitory activity may explain its traditional use for pain relief

Linda K. Banbury, Qingyao Shou, Dane E. Renshaw, Eleanore H. Lambley, more

Journal of Ethnopharmacology > 2015 > 163 > Complete > 251-255

Australian Aboriginal people used crushed leaves of Geijera parviflora Lindl. both internally and externally for pain relief, including for toothache (Cribb and Cribb, 1981). This study tested the hypothesis that this traditional use might be at least in part explained by the presence of compounds with anti-inflammatory activity.A crude extract (95% EtOH) was prepared from powdered dried leaves. From...

article

Low‐Pressure Plasma Methods for Generating Non‐Reactive Hydrophilic and Hydrogel‐Like Bio‐Interface Coatings – A Review

Kim S. Siow, Sunil Kumar, Hans J. Griesser

Plasma Processes and Polymers > 12 > 1 > 8 - 24

This review surveys low‐pressure plasma‐based methods for producing hydrophilic and hydrogel‐like bio‐interface coatings without reactive functional groups in aqueous media. The main focus of the review is one‐step plasma polymerization; other plasma‐based methods such as plasma with grafting are also discussed within the context of monomers used, process development, ageing properties, and interaction...

article

XPS Analysis and Antibacterial Assay of Novobiocin Coating

Hardi Ys, Susan Semple, Hans J. Griesser

Procedia Chemistry > 2015 > 16 > Complete > 592-599

Infection disease after biomedical implant surgery is often caused by unintentional contamination of micro-organism. Novobiocin is one of the most attractive antibiotic due to its high activity against gram positive bacteria and its relatively compatible to fibroblast cell line. Based on the molecular structure of novobiocin, it may be conjugated or coated onto material surfaces. The coating steps...

article

Variations in graded organosilicone microwave PECVD coatings modify stress and improve the durability on plastic substrates

Colin J. Hall, Peter J. Murphy, Torsten Schmauder, Hans J. Griesser

Surface & Coatings Technology > 2014 > 259 > Part C > 616-624

Microwave PECVD with vapours of tetramethyldisiloxane and oxygen was used to deposit transparent organosilicone coatings on PMMA. The ratio of tetramethyldisiloxane to oxygen within the plasma has a large influence on the chemical and physical properties of the deposited coatings. The oxygen flow rate was varied during deposition so as to deposit a chemically graded coating. Grading offers the ability...

article

Antibacterial anthranilic acid derivatives from Geijera parviflora

Qingyao Shou, Linda K. Banbury, Alan T. Maccarone, Dane E. Renshaw, more

Fitoterapia > 2014 > 93 > Complete > 62-66

Five anthranilic acid derivatives, a mixture I of three new compounds 11′-hexadecenoylanthranilic acid (1), 9′-hexadecenoylanthranilic acid (2), and 7′-hexadecenoylanthranilic acid (3), as well as a new compound 9,12,15-octadecatrienoylanthranilic acid (4) together with a new natural product, hexadecanoylanthranilic acid (5), were isolated from Geijera parviflora Lindl. (Rutaceae). Their structures...

article

Biomaterials surfaces capable of resisting fungal attachment and biofilm formation

Bryan R. Coad, Sarah E. Kidd, David H. Ellis, Hans J. Griesser

Biotechnology Advances > 2014 > 32 > 2 > 296-307

Microbial attachment onto biomedical devices and implants leads to biofilm formation and infection; such biofilms can be bacterial, fungal, or mixed. In the past 15years, there has been an increasing research effort into antimicrobial surfaces but the great majority of these publications present research on bacteria, with some reports also testing resistance to fungi. Very few studies have focused...

article

Deposition and XPS and FTIR Analysis of Plasma Polymer Coatings Containing Phosphorus

Kim S. Siow, Leanne Britcher, Sunil Kumar, Hans J. Griesser

Plasma Processes and Polymers > 11 > 2 > 133 - 141

Phosphate groups are part of biological molecules involved in bio‐interfacial phenomena but monomers containing these groups are not volatile enough to be plasma polymerized (pp). Hence monomers with lower oxidation states of P are needed which then does not enable prediction of the oxidation state(s) of P in the pps, nor of possible aging effects. XPS and FTIR analyses of pps from triisopropyl phosphite...

article

Optical biosensing for label-free cellular studies

Régis Méjard, Hans J. Griesser, Benjamin Thierry

Trends in Analytical Chemistry > 2014 > 53 > Complete > 178-186

Optical biosensors such as waveguides and surface-plasmon resonance (SPR) sensors have found numerous applications in biomolecular sciences. We provide an overview of these technologies in relation to the specific requirements of label-free and high-throughput cellular studies. We dedicate specific emphasis to SPR-based biosensors and recent developments particularly suitable for cellular studies,...

article

Controlled covalent surface immobilisation of proteins and peptides using plasma methods

Bryan R. Coad, Marek Jasieniak, Stefani S. Griesser, Hans J. Griesser

Surface & Coatings Technology > 2013 > 233 > Complete > 169-177

Coated layers of biologically active molecules on synthetic biomaterials and biomedical devices can promote a variety of desirable biological reactions by the host body or the biological medium, such as cell and tissue attachment or deterring bacterial biofilm formation. Such coated layers should be immobilised covalently in order to avoid competitive displacement phenomena, and the use of surface-activating...

article

Total synthesis and structural confirmation of the antibacterial diterpene leubethanol

Jessica M.H. Lu, Michael V. Perkins, Hans J. Griesser

Tetrahedron > 2013 > 69 > 31 > 6468-6473

We report the total synthesis of leubethanol (1), a serrulatane compound that has recently been reported as having considerable antibacterial activity against multidrug-resistant bacteria, such as Staphylococcus aureus, and is of interest for applications in the control of bacterial biofilms in human medicine. Our synthetic route begins with (−)-isopulegol (4) and key steps include substrate directed...

article

Pilidiostigmin, a novel bioactive dimeric acylphloroglucinol derivative isolated from Pilidiostigma glabrum

Qingyao Shou, Han Sun, Linda K. Banbury, Eleanore H. Lambley, more

Tetrahedron Letters > 2013 > 54 > 14 > 1853-1856

Pilidiostigmin, a novel dimeric acylphloroglucinol derivative, was isolated from the leaves of the Australian plant species Pilidiostigma glabrum (Myrtaceae). Pilidiostigmin exists in the plant in the form of a sodium salt, which is rare in natural products. The elucidation of the structure and relative configuration was achieved by spectroscopic measurements with special emphasis on 1D and 2D NMR...

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INFONA - science communication portal

Search results for: Hans J. Griesser

An Acid Test: Facile SI‐ARGET‐ATRP of Methacrylic Acid

The importance of fungal pathogens and antifungal coatings in medical device infections

3D printed lattices as an activation and expansion platform for T cell therapy

Plasma Polymers Containing Sulfur and Their Co‐Polymers With 1,7‐Octadiene: Chemical and Structural Analysis

Effects of Precursor and Deposition Conditions on Prevention of Bacterial Biofilm Growth on Chlorinated Plasma Polymers

Antibacterial constituents of Eremophila alternifolia: An Australian aboriginal traditional medicinal plant

Influence of Tetramethyldisiloxane‐Oxygen Mixtures on the Physical Properties of Microwave PECVD Coatings and Subsequent Post‐Plasma Reactions

Advanced biopolymer-coated drug-releasing titania nanotubes (TNTs) implants with simultaneously enhanced osteoblast adhesion and antibacterial properties

Laboratory Scale Systems for the Plasma Treatment and Coating of Particles

Compounds from Geijera parviflora with prostaglandin E2 inhibitory activity may explain its traditional use for pain relief

Low‐Pressure Plasma Methods for Generating Non‐Reactive Hydrophilic and Hydrogel‐Like Bio‐Interface Coatings – A Review

XPS Analysis and Antibacterial Assay of Novobiocin Coating

Variations in graded organosilicone microwave PECVD coatings modify stress and improve the durability on plastic substrates

Antibacterial anthranilic acid derivatives from Geijera parviflora

Biomaterials surfaces capable of resisting fungal attachment and biofilm formation

Deposition and XPS and FTIR Analysis of Plasma Polymer Coatings Containing Phosphorus

Optical biosensing for label-free cellular studies

Controlled covalent surface immobilisation of proteins and peptides using plasma methods

Total synthesis and structural confirmation of the antibacterial diterpene leubethanol

Pilidiostigmin, a novel bioactive dimeric acylphloroglucinol derivative isolated from Pilidiostigma glabrum

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