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

There is a special reason for reviewing this book at this time: it is the 50th edition of a compendium that is known and used frequently in most chemical and physical laboratories in many parts of the world. Surely, a publication that has been published for 56 years, withstanding the vagaries of science in this century, must have had something to offer. There is another reason: while the book is a standard fixture in most chemical and physical laboratories, including those in medical centers, it is not as frequently seen in the laboratories of physician's offices (those either in solo or group practice). I believe that the Handbook can be useful in those laboratories. One of the reasons, among others, is that the various basic items of information it offers may be helpful in new tests, either physical or chemical, which are continuously being published. The basic information may relate

Handbook of Chemistry and Physics

Biodegradable metals are breaking the current paradigm in biomaterial science to develop only corrosion resistant metals. In particular, metals which consist of trace elements existing in the human body are promising candidates for temporary implant materials. These implants would be temporarily needed to provide mechanical support during the healing process of the injured or pathological tissue. Magnesium and its alloys have been investigated recently by many authors as a suitable biodegradable biomaterial. In this investigative review we would like to summarize the latest achievements and comment on the selection and use, test methods and the approaches to develop and produce magnesium alloys that are intended to perform clinically with an appropriate host response.

/pdf/degradable-biomaterials-based-on-magnesium-corrosion-4sw919tlb2.pdf

Degradable biomaterials based on magnesium corrosion

https://material.karlov.mff.cuni.cz/people/janecek/studenti/FyzMetNano/Estrin_AM61_2013_782.pdf

Extreme grain refinement by severe plastic deformation: A wealth of challenging science

The objective of this study is to review and evaluate the applications of magnesium in the automotive industry that can significantly contribute to greater fuel economy and environmental conservation. In the study, the current advantages, limitations, technological barriers and future prospects of Mg alloys in the automotive industry are given. The usage of magnesium in automotive applications is also assessed for the impact on environmental conservation. Recent developments in coating and alloying of Mg improved the creep and corrosion resistance properties of magnesium alloys for elevated temperature and corrosive environments. The results of the study conclude that reasonable prices and improved properties of Mg and its alloys will lead to massive use of magnesium. Compared to using alternative materials, using Mg alloys results in a 22% to 70% weight reduction. Lastly, the use of magnesium in automotive components is increasing as knowledge of forming processes of Mg alloys increases.

Magnesium and its alloys applications in automotive industry

The environmental conditions leading to pitting and crevice corrosion have been measured for a typical 12% Cr low-pressure steam turbine blade material in chloride solutions at 80 C. For t...

Environmental Conditions Leading to Pitting/Crevice Corrosion of a Typical 12% Chromium Stainless Steel at 80 C

Anodic hydrogen evolution on Mg

The 2nd Symposium on Biodegradable Metals was held in Maratea, taly, August 31–September 3, 2010 and was structured into the ollowing five broad scientific sessions: metals, corrosion, in vitro, n vivo, posters and regulatory aspects. The bulk of the symposium as focussed primarily on magnesiumand iron-based materials. t the end of each session a panel discussion was held and varius topics regarding the current session and beyond were debated n an open cohesive and discursive style. Here, we summarize the ey aspects of the entire panel discussion and try to structure the ain topics, concerns and comments that were addressed during he symposium. Acknowledgement is given to all of the participants hose contributions to this summary are very vital. All of the conributors to this summary actively followed the open invitation at he symposium to compile an overview of the panel discussions, nd have accordingly prepared this summary to the best of their nowledge. Therefore, the summary may not represent all of the opics as discussed at the conference in full detail. However, we ope that the reader may be inspired by this summary and that it ay provide new trends and guidelines in the burgeoning field of iodegradable metals as next generation biomedical materials.

Summary of the panel discussions at the 2nd Symposium on Biodegradable Metals, Maratea, Italy, 2010

Pure iron (Fe) is a promising biodegradable metal. However, a too slow biodegradation rate in physiological environments restricts its clinical application. This work produced a Fe/graphene oxide (GO) composite from pure Fe and GO powders, through selective laser melting (SLM). GO is expected to increase the biodegradation rate of Fe. The microstructure, hardness, and corrosion behavior are investigated. The results demonstrated that the GO is distributed relatively uniformly at grain boundaries and inside the matrix. The SLMed Fe/GO composite had finer grain size, higher hardness, and faster biodegradation rate compared to the SLMed pure Fe.

/pdf/graphene-oxide-reinforced-iron-matrix-composite-with-lz5res6lyj.pdf

Graphene Oxide Reinforced Iron Matrix Composite With Enhanced Biodegradation Rate Prepared by Selective Laser Melting

The aim of this work was to assess a number of coatings developed for Mg for biomedical applications. The Mg substrates were high-purity (HP) Mg and ME10, an alloy recently developed for improved extrudability. The research utilized the new fishing-line specimen configuration to allow direct comparison to our recent in vivo and in vitro measurements. The in vitro measurements were immersion tests of fishing-line specimens immersed in Nor's solution at 37 degrees C. Tests of substantial duration are needed because the corrosion rates of uncoated samples are low. Nor's solution is the designation given to Hank's solution through which CO2 is bubbled at a partial pressure of 0.009atm. In this solution, pH is maintained constant by the interaction of CO2 and the bicarbonate ions in the solution. This is the same buffer as that which maintains the pH of blood. Coatings examined were: (i) an anodization using a bio-friendly alkaline electrolyte consisting of phosphate, borate, and metasilicate, (ii) octyltrimethoxysilane (OSi), (iii) 1,2-bis[triethoxysilyl]ethane (BTSE), (iv) anodization+OSi, and (v) anodization + BTSE. The performance of coated samples was comparable to or better than that of the uncoated samples, and there was a substantially better performance for the ME10 samples after anodization+OSi. Reasons for the various performances are discussed.

Andrej Atrens

Papers

Environmental Conditions Leading to Pitting/Crevice Corrosion of a Typical 12% Chromium Stainless Steel at 80 C

Anodic hydrogen evolution on Mg

Summary of the panel discussions at the 2nd Symposium on Biodegradable Metals, Maratea, Italy, 2010

Graphene Oxide Reinforced Iron Matrix Composite With Enhanced Biodegradation Rate Prepared by Selective Laser Melting

Evaluation of Coatings for Mg Alloys for Biomedical Applications