다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Microfibrillated cellulose - its barrier properties and applications in cellulosic materials: a review.

https://cyberleninka.org/article/n/1316165.pdf

Nanocellulose in biomedicine: Current status and future prospect

Nanocelluloses, including nanocrystalline cellulose, nanofibrillated cellulose and bacterial cellulose nanofibers, have become fascinating building blocks for the design of new biomaterials. Derived from the must abundant and renewable biopolymer, they are drawing a tremendous level of attention, which certainly will continue to grow in the future driven by the sustainability trend. This growing interest is related to their unsurpassed quintessential physical and chemical properties. Yet, owing to their hydrophilic nature, their utilization is restricted to applications involving hydrophilic or polar media, which limits their exploitation. With the presence of a large number of chemical functionalities within their structure, these building blocks provide a unique platform for significant surface modification through various chemistries. These chemical modifications are prerequisite, sometimes unavoidable, to adapt the interfacial properties of nanocellulose substrates or adjust their hydrophilic–hydrophobic balance. Therefore, various chemistries have been developed aiming to surface-modify these nano-sized substrates in order to confer to them specific properties, extending therefore their use to highly sophisticated applications. This review collocates current knowledge in the research and development of nanocelluloses and emphasizes more particularly on the chemical modification routes developed so far for their functionalization.

Key advances in the chemical modification of nanocelluloses

Cellulose fibrils with widths in the nanometer range are nature-based materials with unique and potentially useful features. Most importantly, these novel nanocelluloses open up the strongly expanding fields of sustainable materials and nanocomposites, as well as medical and life-science devices, to the natural polymer cellulose. The nanodimensions of the structural elements result in a high surface area and hence the powerful interaction of these celluloses with surrounding species, such as water, organic and polymeric compounds, nanoparticles, and living cells. This Review assembles the current knowledge on the isolation of microfibrillated cellulose from wood and its application in nanocomposites; the preparation of nanocrystalline cellulose and its use as a reinforcing agent; and the biofabrication of bacterial nanocellulose, as well as its evaluation as a biomaterial for medical implants.

Nanocelluloses: A New Family of Nature-Based Materials

Cellulosefibrillen und -kristalle mit einem Durchmesser im Nanometerbereich sind naturbasierte Materialien mit einzigartigen und potenziell wertvollen Eigenschaften. Vor allem eroffnen diese neuartigen Nanocellulosen dem naturlichen Polymer Cellulose die stark expandierenden Einsatzgebiete nachhaltige Materialien, Nanokomposite sowie Produkte fur die Medizin und die Lebenswissenschaften. Die Nanodimensionen der Strukturelemente fuhren zu grosen Oberflachen und damit zu starken Wechselwirkungen dieser Cellulosen mit umgebenden Stoffen wie Wasser, anorganischen, organischen und polymeren Verbindungen, Nanopartikeln und lebenden Zellen. Diese Ubersicht bietet das aktuelle Wissen uber die Isolierung mikrofibrillierter Cellulose aus Holz und ihre Anwendung in Nanokompositen, die Herstellung nanokristalliner Cellulose und ihren Einsatz als Verstarkungsmaterial sowie die biotechnologische Erzeugung bakterieller Nanocellulose einschlieslich ihrer Eignung als Biomaterial fur medizinische Implantate.

Nanocellulosen: eine neue Familie naturbasierter Materialien

A process for producing a hollow body made from microbial cellulose, or a precursor of a hollow body made from microbial cellulose, comprising the following steps: a) the contacting of the surface of a template which is a cast of the cavity of the hollow body to be produced and the inner walls of the cavity with a mixture supply comprising a liquid culture medium and a cellulose-forming microorganism, b) the interruption of the contact between the template and the mixture supply, leaving a liquid film comprising the liquid culture medium and the microorganism on the surface of the template, c) the contacting of liquid film with an oxygenous atmosphere and the formation of microbial cellulose in and/or on the liquid film, d) the contacting of the cellulose obtained in step c) with the mixture supply, e) the interruption of the contact between the cellulose and the mixture supply, leaving a liquid film comprising the liquid culture medium and the microorganism on the surface of the cellulose, f) the contacting of the liquid film with an oxygenous atmosphere and the formation of microbial cellulose in and/or on the liquid film, the sequence of steps d), e) and f) optionally being repeated once or more than once, g) optionally the separation of the microbial cellulose from the template and hollow body made from microbial cellulose which is obtainable by the process.

Process for producing hollow bodies from microbial cellulose

Vorrichtung (1) zur Herstellung eines Hohlkorpers aus einem mikrobiellen Polymer, insbesondere mikrobieller Cellulose, aufweisend – ein Template (3), das die Negativform des Hohlraums des herzustellenden Hohlkorpers und der inneren Wande des Hohlraums ist, – ein erstes Reservoir (2), das mit einem Gemisch (10), welches ein flussiges Kulturmedium und einen Polymer bildenden Mikroorganismus umfasst, befullbar ist, – eine Benetzungseinrichtung (6, 7) zur Benetzung des Templates (3) mit dem in das Reservoir eingebrachten Gemisch (10), – ein Gehause (15), welches zumindest das Template (3) und das Reservoir (2) so umschliest, dass ein Stoffaustausch mit der Umgebung (18) des Gehauses verhinderbar ist, und Verfahren zur Herstellung eines Hohlkorpers aus einem mikrobiellen Polymer oder zur Beschichtung eines Gegenstands mit einem mikrobiellen Polymer

Sebastian Moritz

Papers

Nanocelluloses: A New Family of Nature-Based Materials

Nanocelluloses: A New Family of Nature-Based Materials

Nanocellulosen: eine neue Familie naturbasierter Materialien

Process for producing hollow bodies from microbial cellulose

Vorrichtung zur Herstellung von Hohlkörpern aus mikrobiellem Polymer