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Oxidised cellulose

Ssy Tan, M S Yeo, Ghp Lee, Msy Ho, M L Ang, W Lee, E C Cheong
INTRODUCTION Foreign bodies (FBs) in the masticator space (MS) are a unique problem because of the difficulty of accessing this deep compartment within the head and neck. In addition, MS contents include critical structures such as the internal maxillary artery (IMA) and mandibular nerve. CASE HISTORY A 39-year-old tradesman was involved in a construction accident whereby a metallic projectile from a machinery drill penetrated his left cheek. Computed tomography revealed a metallic object of dimension 1.9 ×1...
August 23, 2016: Annals of the Royal College of Surgeons of England
Julia Catalán, Elina Rydman, Kukka Aimonen, Kati-Susanna Hannukainen, Satu Suhonen, Esa Vanhala, Carlos Moreno, Valérie Meyer, Denilson da Silva Perez, Asko Sneck, Ulla Forsström, Casper Højgaard, Martin Willemoes, Jacob R Winther, Ulla Vogel, Henrik Wolff, Harri Alenius, Kai M Savolainen, Hannu Norppa
Nanofibrillated cellulose (NFC) is a sustainable and renewable nanomaterial, with diverse potential applications in the paper and medical industries. As NFC consists of long fibres of high aspect ratio, we examined here whether TEMPO-(2,2,6,6-tetramethyl-piperidin-1-oxyl) oxidised NFC (length 300-1000nm, thickness 10-25nm), administrated by a single pharyngeal aspiration, could be genotoxic to mice, locally in the lungs or systemically in the bone marrow. Female C57Bl/6 mice were treated with four different doses of NFC (10, 40, 80 and 200 µg/mouse), and samples were collected 24h later...
July 28, 2016: Mutagenesis
Meri J Lundahl, A Gisela Cunha, Ester Rojo, Anastassios C Papageorgiou, Lauri Rautkari, Julio C Arboleda, Orlando J Rojas
Hydrogels comprising cellulose nanofibrils (CNF) were used in the synthesis of continuous filaments via wet-spinning. Hydrogel viscosity and spinnability, as well as orientation and strength of the spun filaments, were found to be strongly affected by the osmotic pressure as determined by CNF surface charge and solid fraction in the spinning dope. The tensile strength, Young's modulus and degree of orientation (wide-angle X-ray scattering, WAXS) of filaments produced without drawing were 297 MPa, 21 GPa and 83%, respectively, which are remarkable values...
2016: Scientific Reports
Paul H Walton, Gideon J Davies
Lytic polysaccharide monooxygenases (LPMOs) are recently discovered copper-containing oxygenases. LPMOs oxidise recalcitrant polysaccharides such as chitin and cellulose, thereby making these substrates more tractable to canonical chitinase or cellulase action. As such, LPMOs are attracting much attention not only for their capacity to greatly increase the efficiency of production of cellulosic-based biofuels, but also for the new questions they pose about the mechanisms of biological oxidation of recalcitrant substrates...
April 2016: Current Opinion in Chemical Biology
Rahman Rahmanpour, Dean Rea, Shirin Jamshidi, Vilmos Fülöp, Timothy D H Bugg
A Dyp-type peroxidase enzyme from thermophilic cellulose degrader Thermobifida fusca (TfuDyP) was investigated for catalytic ability towards lignin oxidation. TfuDyP was characterised kinetically against a range of phenolic substrates, and a compound I reaction intermediate was observed via pre-steady state kinetic analysis at λmax 404 nm. TfuDyP showed reactivity towards Kraft lignin, and was found to oxidise a β-aryl ether lignin model compound, forming an oxidised dimer. A crystal structure of TfuDyP was determined, to 1...
March 15, 2016: Archives of Biochemistry and Biophysics
Vedat Yildirim, Heinz-Theo Lübbers, Ayhan Yildirim
Since the 1950s, oxidised regenerate cellulose (TABOTAMP ®) has been successfully applied for local haemostasis in intra- or postoperative bleeding complications. The scope of this medical product is large and it has found its place in oral and maxillofacial surgery. Although the application of TABOTAMP ® in medicine and dentistry is common, further complications next to the absence of the haemostatic effect may be encountered if used incorrectly. The aim of this article is an update on the proper use of TABOTAMP ®...
2015: Swiss Dental Journal
Qiaoling Zhou, Douglas G West, Golda Shelley-Fraser, Andrew R L Medford
The radiological finding of mediastinal lymph node enlargement following surgery for lung cancer often signifies locoregional recurrence. The use of oxidised cellulose haemostatic agents (OCHAs) during staging mediastinoscopy is common. We report a case of 18-fluorodeoxyglucose-avid subcarinal lymphadenopathy in a patient in whom OCHAs had been used at mediastinoscopy 5 months earlier. Histopathological examination of suspected nodal recurrence is facilitated by endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA)...
2015: Respiration; International Review of Thoracic Diseases
Oliver Kloeters, Frank Unglaub, Erik de Laat, Marjolijn van Abeelen, Dietmar Ulrich
In chronic wounds, excess levels and activity of proteases such as elastase and plasmin have been detected. Oxidised regenerated cellulose/collagen matrix (ORC/collagen matrix) has been reported to ameliorate the wound microenvironment by binding and inactivating excess proteases in wound exudates. In this study, the levels and activity of elastase and plasmin in wound exudates of pressure sore ulcers were measured to determine the beneficial effect of ORC/collagen matrix treatment compared with control treatment with a foam dressing...
May 23, 2015: International Wound Journal
Gaity Ahmad, Helena O'Flynn, Akshay Hindocha, Andrew Watson
BACKGROUND: Pelvic adhesions can form as a result of inflammation, endometriosis or surgical trauma. During pelvic surgery, strategies to reduce pelvic adhesion formation include placing barrier agents such as oxidised regenerated cellulose, polytetrafluoroethylene or fibrin sheets between the pelvic structures. OBJECTIVES: To evaluate the effects of barrier agents used during pelvic surgery on rates of pain, live birth and postoperative adhesions in women of reproductive age...
2015: Cochrane Database of Systematic Reviews
Akshay Hindocha, Lawrence Beere, Sofia Dias, Andrew Watson, Gaity Ahmad
BACKGROUND: Intraperitoneal adhesions are associated with considerable co-morbidity and have large financial and public health repercussions. They have secondary effects that include chronic pelvic pain, dyspareunia, subfertility and bowel obstruction. In women with adhesions, subsequent surgery is more difficult, often takes longer, and is associated with a higher complication rate (Broek 2013). The significant burden of adhesions has led to the development of several anti-adhesion agents, although there is disagreement as to their relative effectiveness...
2015: Cochrane Database of Systematic Reviews
Marcio Masashi Kajikawa, Zsuzsanna Ilona Katalin Jármy-Di Bella, Juliane Dornelas, Luciana Campanatti Crema, Cláudia Cristina Takano, Gustavo Rubino de Azevedo Focchi, Liliam Cristine Rolo, Edward Araujo Júnior, Rodrigo Aquino Castro, Manoel João Batista Castello Girão, Marair Gracio Ferreira Sartori
The aim of the study was to compare the expression of oestrogen receptor alpha (ERα) in neovaginal tissue of patients with vaginal agenesis following neovaginoplasty using regenerated, oxidised cellulose in premenopausal women. A prospective, observational case-control study was performed on eight patients with vaginal agenesis following modified Abbé-McIndoe neovaginoplasty and 10 control premenopausal women following benign gynaecologic surgery. 6F11 monoclonal antibody was used to determine ERα expression in the vaginal mucosa...
April 2015: Gynecological Endocrinology
John Andrews, Anne-Marie Smit, Suren Wijeyekoon, Ben McDonald, Saeid Baroutian, Daniel Gapes
A hybrid technique incorporating a wet oxidation stage and secondary fermentation step was used to process Pinus radiata pulp mill effluent sludge. The effect of hydrothermal oxidation at high temperature and pressure on the hydrolysis of constituents of the waste stream was studied. Biochemical acidogenic potential assays were conducted to assess acid production resulting from anaerobic hydrolysis of the wet oxidised hydrolysate under acidogenic conditions. Significant degradation of the lignin, hemicellulose, suspended solids, carbohydrates and extractives were observed with wet oxidation...
October 2014: Bioresource Technology
S Al-Shaikh, A Muddaiah, R J Lee, M F Bhutta
BACKGROUND: Haemorrhage is the most common major complication of endoscopic sinus surgery. Post-operative absorbable or non-absorbable nasal packing can cause pain and blockage. Haemostatic powders or gels may prevent this problem. However, when based on factors in the clotting cascade, they induce an inflammatory reaction and can cause post-operative synechiae. Oxidised cellulose powder produces haemostasis without inducing synechiae formation, but has not been trialled for sinus surgery...
August 2014: Journal of Laryngology and Otology
Sheela Reuben, Krzysztof Banas, Agnieszka Banas, Sanjay Swarup
Understanding the spatial heterogeneity within environmental biofilms can provide an insight into compartmentalization of different functions in biofilm communities. We used a non-destructive and label-free method by combining Synchrotron Radiation-based Fourier Transform Infrared Microspectroscopy (SR-FTIR) with Confocal Laser Scanning Microscopy (CLSM) to distinguish the spatial chemical changes within multispecies biofilms grown from natural storm waters in flow cells. Among the different surfaces tested for biofilm growth and optimal imaging, mylar membranes were most suited and it enabled successful spatial infrared imaging of natural biofilms for obtaining reliable and interpretable FTIR spectra...
November 1, 2014: Water Research
Anne Kallioinen, Terhi Puranen, Matti Siika-aho
Optimal enzyme mixtures of six Trichoderma reesei enzymes and five thermostable enzyme components were developed for the hydrolysis of hydrothermally pretreated wheat straw, alkaline oxidised sugar cane bagasse and steam-exploded bagasse by statistically designed experiments. Preliminary studies to narrow down the optimization parameters showed that a cellobiohydrolase/endoglucanase (CBH/EG) ratio of 4:1 or higher of thermostable enzymes gave the maximal CBH-EG synergy in the hydrolysis of hydrothermally pretreated wheat straw...
July 2014: Applied Biochemistry and Biotechnology
Dhouha Mamlouk, Maria Gullo
Acetic acid bacteria (AAB) are obligately aerobic bacteria within the family Acetobacteraceae, widespread in sugary, acidic and alcoholic niches. They are known for their ability to partially oxidise a variety of carbohydrates and to release the corresponding metabolites (aldehydes, ketones and organic acids) into the media. Since a long time they are used to perform specific oxidation reactions through processes called "oxidative fermentations", especially in vinegar production. In the last decades physiology of AAB have been widely studied because of their role in food production, where they act as beneficial or spoiling organisms, and in biotechnological industry, where their oxidation machinery is exploited to produce a number of compounds such as l-ascorbic acid, dihydroxyacetone, gluconic acid and cellulose...
December 2013: Indian Journal of Microbiology
Sergey M Abramov, Elmira R Sadraddinova, Andrey I Shestakov, Oleg G Voronin, Arkadiy A Karyakin, Nikolay A Zorin, Alexander I Netrusov
Hydrogen-producing thermophilic cellulolytic microorganisms were isolated from cow faeces. Rates of cellulose hydrolysis and hydrogen formation were 0.2 mM L(-1) h(-1) and 1 mM L(-1) h(-1), respectively. An enzymatic fuel cell (EFC) with a hydrogenase anode was used to oxidise hydrogen produced in a microbial bioreactor. The hydrogenase electrode was exposed for 38 days (912 h) to a thermophilic fermentation medium. The hydrogenase activity remaining after continuous operation under load was 73% of the initial value...
2013: PloS One
Michael Freedman, Leo F A Stassen
A small number of medicaments are used in oral and maxillofacial surgery to dress wounds, relieve pain, prevent infection and promote healing. While these materials are routinely used, their constituents, uses and effects on oral tissues are rarely discussed. This literature review provides an overview of the constituents, uses and effects of the common materials--oxidised regenerated cellulose, Whitehead's varnish, Carnoy's solution, bismuth iodoform paraffin paste (BIPP), zinc oxide eugenol (ZOE) and Alvogyl...
August 2013: Journal of the Irish Dental Association
Richard P G ten Broek, Martijn W J Stommel, Chema Strik, Cornelis J H M van Laarhoven, Frederik Keus, Harry van Goor
BACKGROUND: Formation of adhesions after peritoneal surgery results in high morbidity. Barriers to prevent adhesion are seldom applied, despite their ability to reduce the severity of adhesion formation. We evaluated the benefits and harms of four adhesion barriers that have been approved for clinical use. METHODS: In this systematic review and meta-analysis, we searched PubMed, CENTRAL, and Embase for randomised clinical trials assessing use of oxidised regenerated cellulose, hyaluronate carboxymethylcellulose, icodextrin, or polyethylene glycol in abdominal surgery...
January 4, 2014: Lancet
Gregorio Scerrino, Nunzia Cinzia Paladino, Valentina Di Paola, Giuditta Morfino, Emanuele Amodio, Gaspare Gulotta, Sebastiano Bonventre
AIM: To assess the efficacy of two widely used topical haemostatic agents: oxidised regenerated cellulose gauze and Collagen- Fibrinogen-Thrombin Patch in patients undergoing total thyroidectomy. MATERIAL OF STUDY: This was a prospective, comparative, non-randomised study in which consecutive patients undergoing total thyroidectomy for benign disease received standard treatment with no haemostatic agent, cellulose gauze, or CFTP. Main outcome measures were drainage volume 24 hours after surgical procedure and the occurrence of post-operative complications (haematoma, seroma, surgical-site infection)...
September 2013: Annali Italiani di Chirurgia
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