Search

China's aging demographic poses a challenge for treating prevalent bone diseases impacting life quality. As bone regeneration capacity diminishes with age due to cellular dysfunction and inflammation, advanced biomaterials-based approaches offer hope for aged bone regeneration. This review synthesizes materiobiology principles, focusing on biomaterials that target specific biological functions to restore tissue integrity. It covers strategies for stem cell manipulation, regulation of the inflammatory microenvironment, blood vessel regeneration, intervention in bone anabolism and catabolism, and nerve regulation. The review also explores molecular and cellular mechanisms underlying aged bone regeneration and proposes a database-driven design process for future biomaterial development. These insights may also guide therapies for other age-related conditions, contributing to the pursuit of 'healthy aging'. [ABSTRACT FROM AUTHOR]

The Ediacaran to Cambrian transition witnessed great biological and environmental turnovers from the Precambrian to Phanerozoic. These changes are also reflected by the fossil records during that time. However, the fossil distribution was highly heterogenous. While diverse fossils were constantly found from the shallow shelf including restricted basins, reports from deep-water areas, which are characterized by chert-dominated formations straddling the Ediacaran-Cambrian boundary, were scarce. Among them was the Liuchapo Formation that has been considered barren. In this study, a fossiliferous assemblage was found from the Liuchapo Formation in east Guizhou Province, South China. This assemblage comprises Palaeopascichnus jiumenensis, Horodyskia minor, multicellular algae that possibly related with red algae, cyanobacteria, sponge spicules, small shelly fossils, membrane structures of uncertain affinity, and fossils with structures resemble the Ediacaran Megasphaera. Palaeopascichnus and Horodyskia have been widely reported and abundant in the Liuchapo Formation and equivalents, while the others have seldomly, or never, been found from this formation or, more widely, the deep-water chert of transitional interval. The discovery not only contributes to the rare paleontological records preserved in deep-water sediments, but also expanded the geographic distribution of the fossils, providing new materials of biological diversity during this critical interval. [ABSTRACT FROM AUTHOR]

BACKGROUND: Small-diameter blood vessel prosthesis has a wide application value in the treatment of peripheral vascular diseases, but the problem of graft failure due to early thrombosis needs to be solved. OBJECTIVE: To summarize research progress on early thrombosis and prevention of small-diameter blood vessel prosthesis. METHODS: The relevant literature published on CNKI, Wanfang, PubMed, and Google Scholar databases from 2000 to 2020 was retrieved by the first author. The Chinese search terms were “small-diameter blood vessel prosthesis, small-diameter tubular stents, tissue-engineered blood vessels, antithrombotic, thrombosis, hemocompatibility, hydrophilicity, endothelialization”. The English search terms were “small-caliber vascular graft, vascular tissue engineering applications, endothelialization, hemocompatibility, surface modification”. The relevant literature on the pathophysiological mechanism and prevention of small-diameter blood vessel prosthesis thrombosis in China and abroad was retrieved, and the surface modification and endothelialization of biological materials were taken as the inclusion criteria. Finally, 57 articles were selected for review. RESULTS AND CONCLUSION: Prevention of thrombosis is a hotspot and a difficulty in the study of small-diameter blood vessel prosthesis. The research progress at home and abroad in recent years shows that the early thrombosis of small-diameter blood vessel prosthesis is related to plasma protein adsorption and contact activation of coagulation factors. By improving the surface hydrophilicity, releasing antithrombotic substances, planting seed cells and target gene induction, the thrombosis of small-diameter blood vessel prosthesis has been improved to a certain extent, but it is still in the experimental stage, and there is still a certain distance from clinical application. Therefore, it is necessary to further explore or optimize a more suitable vascular material to provide more choices for clinical application. [ABSTRACT FROM AUTHOR]

The limitations of traditional cancer treatments are driving the creation and development of new nanomedicines. At present, with the rapid increase of research on nanomedicine in the field of cancer, there is a lack of intuitive analysis of the development trend, main authors and research hotspots of nanomedicine in the field of cancer, as well as detailed elaboration of possible research hotspots. In this review, data collected from the Web of Science Core Collection database between January 1st, 2000, and December 31st, 2021, were subjected to a bibliometric analysis. The co-authorship, co-citation, and co-occurrence of countries, institutions, authors, literature, and keywords in this subject were examined using VOSviewer, Citespace, and a well-known online bibliometrics platform. We collected 19,654 published papers, China produced the most publications (36.654%, 7204), followed by the United States (29.594%, 5777), and India (7.780%, 1529). An interesting fact is that, despite China having more publications than the United States, the United States still dominates this field, having the highest H-index and the most citations. Acs Nano, Nano Letters, and Biomaterials are the top three academic publications that publish articles on nanomedicine for cancer out of a total of 7580 academic journals. The most significant increases were shown for the keywords "cancer nanomedicine", "tumor microenvironment", "nanoparticles", "prodrug", "targeted nanomedicine", "combination", and "cancer immunotherapy" indicating the promising area of research. Meanwhile, the development prospects and challenges of nanomedicine in cancer are also discussed and provided some solutions to the major obstacles. [Display omitted] • Data of current nanomedicine in cancer were collected from the Web of Science. • Collected data were systematically analyzed through bibliometric analysis. • Many keywords of nanomedicine in cancer were intuitively analyzed. • Hotspots, emerging frontiers and trend of nanomedicine in cancer were investigated. • Development prospects and challenges of nanomedicine in cancer were discussed. [ABSTRACT FROM AUTHOR]

Wheat straw (WS) was considered the most abundant agricultural residue in China. Therefore, it was meaningful to explore the effective utilization of WS. Thus far, WS has been considered a potential raw material to produce lignocellulose nanofibrils (LCNFs) with the rapid development of nanotechnology. Unfortunately, the existing methods of LCNFs preparation directly from WS still faced some hurdles. Herein, screw extrusion and ball milling considered the common mechanical pretreatments were employed to directly prepare LCNFs from WS. The different impacts of screw extrusion and ball milling pretreatments on the properties of LCNFs were revealed by systematically comparing physicochemical analyses. The results showed that the crystalline and chemical structure of samples was little affected by the mechanical pretreatment. However, the mechanical pretreatment caused a change in the morphology, yield, and chemical composition of LCNFs. LCNFs prepared by screw extrusion with a high yield of 73% had the narrowest diameter distribution (0 ~ 80 nm), the most cellulose content (51.1%), and the maximum crystallinity degree (44.7%). LCNF samples all exhibited good thermal stability. This work could not only offer theoretical guidance on the preparation of LCNFs by mechanical pretreatments but also expand the high‐value application of WS in polymer composites. [ABSTRACT FROM AUTHOR]

Sinomenine (SIN), a natural product, has been used to treat rheumatoid arthritis (RA) in China for thousands of years. SIN has been developed for the treatment of RA by way of tablets and injections, but both dosage forms have been associated with severe adverse reactions. Making SIN into liposomes-in-hydrogel biomaterials for external use has a good slow-release effect and can play an important role in avoiding the first-pass effect, gastrointestinal reaction, and increasing the local action time of drugs. SIN-loaded liposomes were formed by the thin-film dispersion method, then SIN-loaded liposomes-in-hydrogels were prepared by combining the SIN-L with hyaluronic acid (HA) hydrogels. In this paper, the basic characteristics, In vitro and Ex vivo release, and antioxidant activity of SIN-loaded liposomes-in-hydrogels were studied. The results showed that SIN-loaded liposomes-in-hydrogels have good sustained-release and antioxidant effects, and the preparation is expected to be a good biomaterial. [ABSTRACT FROM AUTHOR]

Osteoporotic fractures, also known as fragility fractures, are prevalent in the elderly and bring tremendous social burdens. Poor bone quality, weak repair capacity, instability, and high failure rate of internal fixation are main characteristics of osteoporotic fractures. Osteoporotic bone defects are common and need to be repaired by appropriate materials. Proximal humerus, distal radius, tibia plateau, calcaneus, and spine are common osteoporotic fractures with bone defect. Here, the consensus from the Osteoporosis Group of Chinese Orthopaedic Association concentrates on the epidemiology, characters, and management strategies of common osteoporotic fractures with bone defect to standardize clinical practice in bone repair of osteoporotic fractures. [ABSTRACT FROM AUTHOR]

An increasing amount of waste seashells in China has caused serious environmental pollution and resource waste. This paper aims to solve these problems by using waste seashells as modified materials to prepare high-performance modified asphalt. In this study, seashell powder (SP) and stratum corneum-exfoliated seashell powder (SCESP) were adopted to prepare 10%, 20% and 30% of seashell powder-modified asphalt (SPMA) and stratum corneum-exfoliated seashell powder-modified asphalt (SCESPMA) by the high-speed shear apparatus, respectively. The appearance and composition of two kinds of SPs were observed and determined by the scanning electron microscope (SEM). The types of functional groups, temperature frequency characteristics, low temperature performance and adhesion of SPMA were tested by the Fourier-transform infrared (FTIR) spectrometer, dynamic shear rheometer (DSR), bending beam rheometer (BBR) and contact angle meter. The results show that the SP and SCESP are rough and porous, and their main component is CaCO3, which is physically miscible to asphalt. When the loading frequency ranges from 0.1 Hz to 10 Hz, the complex shear modulus (G*) and phase angle (δ) of SPMA and SCESPMA increase and decrease, respectively. At the same load frequency, SCESPMA has a larger G* and a smaller δ than SPMA. At the same temperature, SCESPMA has a larger rutting factor (G*/sin δ) and better high-temperature deformation resistance than SPMA. SP and SCESP reduce the low-temperature cracking resistance of asphalt, of which SCESP has a more adverse effect on the low-temperature performance of asphalt than SP. When SP and SCESP are mixed with asphalt, the cohesion work (Waa), adhesion work (Was) and comprehensive evaluation parameters of water stability (ER1, ER2 and ER3) of asphalt are improved. It is shown that both SP and SCESP have good water damage resistance, of which SCESP has better water damage resistance than SP. These research results have important reference value for the application of waste biological materials in asphalt pavement. [ABSTRACT FROM AUTHOR]

The contemporary development of science and technology in the field of biomedicine has influenced the development of innovative research tools in modern diagnostics and therapies. Many Asian countries are currently interested in genetic research and biobanks, in response to increasing competitiveness on the global biotechnology market. Establishing of a modern research infrastructure in China, Japan, and South Korea is essential for future research on the etiology of genetic diseases and the development of effective methods of their treatment. Undertaking concerted legislative work is a response to numerous challenges related to the collection, processing, and sharing of biological material and related genetic information. The main problems in the field of genetic research and biobanks are the concept of informed consent, the protection of genetic data, and the commercialization of genetic material. Bio-law in China, Japan, and South Korea is the result of the search for consensus between protecting the fundamental rights of individuals and the freedom of research. [ABSTRACT FROM AUTHOR]

BACKGROUND: As a common disease of the motor system, bone defect is of great significance to be treated by effective means. However, there is still a lack of literature review on the treatment of bone defect by bibliometrics in China. OBJECTIVE: To analyze the literature on the treatment of bone defect published in recent 10 years and to explore the research status, hotspots, and trends in this field, and to provide opinions and suggestions for its future development. METHODS: Using Web of Science Core Collection database as the data source and the application of bibliometrics, CiteSpace V software was used to draw the knowledge map and conduct cluster analysis of the annual trends, the distribution of nations, the distribution of research institution, the distribution of authors and the key words in the field of bone defect treatment from 2011 to 2020. RESULTS AND CONCLUSION: A total of 1 743 valid articles were selected. (1) The volume of publications shows a steady rise from 2011 to 2020 in general. In terms of scientific research funds, the National Natural Science Foundation of China funded the most projects (23.81%). (2) China and Shanghai Jiao Tong University are the country and research institution with the most publications in this field respectively. USA and Chinese Academy of Sciences play the role of academic hub with the strongest centrality. (3) A total of 476 authors were included. Lei Zhang, Changsheng Liu, and Ana Claudia Muniz Renno were the most prolific researchers, but the core authors did not form a close cooperative relationship. (4) Biomaterials is the journal with the largest number of articles, and has an authoritative position in the field of biological materials. (5) Repair, regeneration, in vitro, scaffold, and mesenchymal stem cell are the research hotspots in this field. (6) Time zone analysis showed that the previous research strategies were mainly for inducing differentiation and promoting regeneration of bone defects. Since 2015, nanoparticles, hydrogels and other materials are gradually widely used in the treatment of bone defects with the help of 3D printing technology. In recent years, researchers hope to explore the mechanism of bone defect treatment at the level of signaling pathway, and hope to use new composite scaffolds combined with drug/growth factor controlled release technology to achieve better therapeutic effect. (7) The future development directions of bone defect treatment are as follows: Continue to prepare new nano-composite scaffolds with good mechanical properties by using 3D printing and other technologies; preparation of double/multiple controlled release drug and/or growth factor stents; repair large bone defects, especially those caused by cancer, while inhibiting inflammation, oxidative stress and other reactions; to explore the mechanism of various growth factors in bone defect repair at the signaling pathway level; basic and clinical research on osteoporosis treatment drugs. It is concluded that bone defect treatment has been paid more and more attention in recent ten years. China has played an important role in this field. The results of this study provide a new perspective for the future research in this field, and play an enlightening role for domestic researchers. [ABSTRACT FROM AUTHOR]

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The review summaries our achievements in biomineralization. A new understanding of non‐classical nucleation is introduced, which highlights the formation of ionic clusters during the early mineral formation. This discovery directs to a new chemical concept of inorganic ionic oligomers and their crosslinking. Different from the conventional syntheses of inorganic materials, the inorganic ionic oligomers can be used as the conformable precursors to achieve moldable constructions, which arises from a fusion of classic inorganic and polymer chemistry by sharing the same process for the manufacture of materials. By using the inorganic oligomers, the biomimetic regenerations/ repairs of hard tissues such as tooth enamel and bone can be realized. And the advanced artificial materials superior over biological ones can be developed by inorganic‐organic co‐polymerization. Moreover, biomineralization is a tool for the integration of materials and biological organism. Our attempts demonstrate that the rationally designed materials‐biologicals can contribute to vaccine improvement, universal blood transfusion, and cancer treatment, etc. They follow a transformation of biomineralization study from biomimetic synthesis of materials to biomimetic modification of organisms and furthermore, start an understanding of chemical biological regulation by materials. What is the most favorite and original chemistry developed in your research group? The discovery of ionic oligomers and their crosslinking following a new concept of inorganic ionic polymerization. How do you get into this specific field? Could you please share some experiences with our readers? I got into the field of biomineralization when I was a graduate student. A challenge in biomineralization community is how we can achieve a moldable construction of inorganic materials (biominerals). Fortunately, we observed the formation of ultrasmall ion aggregates at the early nucleation strategy. This finding subsequently directed to our exploration of ionic oligomers and the most important key was a new start of this inorganic study upon a view of polymer chemistry. How do you supervise your students? I keep on asking my students two questions: 1) What unsolvable problem can you solve for our society by your study? 2) What new understanding can you contribute to our scientific community by your study? What is the most important personality for scientific research? Ready to accept challenge, persist and never give up. What are your hobbies? What's your favorite book(s)? I like travel since I can feel different culture and learn many different ideas in the travelling. I prefer history books since I can "earn" much valuable experience in the reading. How do you keep balance between research and family? Working effectively in weekday and relaxing completely in weekend. Who influences you mostly in your life? The group of my friends and colleagues. I learn lots to improve myself under their help and criticisms. Could you please give us some advices on improving Chinese Journal of Chemistry? To induce the best chemical research in China, beginning from review papers but finally moving to the top research papers. [ABSTRACT FROM AUTHOR]

Asian dust is an important source of atmospheric ice-nucleating particles (INPs). However, the freezing activity of airborne Asian dust, especially its sensitivity to particle size, is poorly understood. In this study we report the first INP measurement of size-resolved airborne mineral dust collected during East Asian dust events. The measured total INP concentrations in the immersion mode ranged from 10 -2 to 10 2 L -1 in dust events at temperatures between -25 and -5 ∘ C. The average contributions of heat-sensitive INPs at three temperatures, -10 , -15 , and -20 ∘ C, were 81±12 %, 70±15 %, and 38±21 %, respectively, suggesting that proteinaceous biological materials have a substantial effect on the ice nucleation properties of Asian airborne mineral dust at high temperatures. The dust particles which originated from China's northwest deserts are more efficient INPs compared to those from northern regions. In general, there was no significant difference in the ice nucleation properties between East Asian dust particles and other regions in the world. An explicit size dependence of both INP concentration and surface ice-active-site density was observed. The nucleation efficiency of dust particles increased with increasing particle size, while the INP concentration first increased rapidly and then leveled, due to the significant decrease in the number concentration of larger particles. A new set of parameterizations for INP activity based on size-resolved nucleation properties of Asian mineral dust particles were developed over an extended temperature range (-35 to -6 ∘ C). These size-dependent parameterizations require only particle size distribution as input and can be easily applied in models. [ABSTRACT FROM AUTHOR]

Forensic biomechanics gradually has become a significant component of forensic science. Forensic biomechanics is evidence-based science that applies biomechanical principles and methods to forensic practice, which has constituted one of the most potential research areas. In this review, we introduce how finite element techniques can be used to simulate forensic cases, how injury criteria and injury scales can be used to describe injury severity, and how tests of postmortem human subjects and dummy can be used to provide essential validation data. This review also describes research progress and new applications of forensic biomechanics in China. The review shows the main research progress and new applications of forensic biomechanics in China. The review introduces eight cases about the application of forensic biomechanics, including the multiple rigid body reconstruction, the finite element applications, study of mechanical properties, traffic crash reconstruction based on multiple techniques and analysis of morphomechanical mechanism about blood dispersal. Though forensic biomechanics has a great advantage for the evaluation of injury mechanisms, it still has some uncertainties owing to the uniqueness of the human anatomy, the complexity of biological materials, and the uncertainty of injury-causing circumstances. [ABSTRACT FROM AUTHOR]

Summary: Aim: Tissue engineering has been recognised as one of the most effective means to form a new viable tissue for medical purpose. Tissue engineering involves a combination of scaffolds, cells, suitable biochemical and physicochemical factors, and engineering and materials methods. This review covered some biomedicine, such as biomaterials, bioactive factors, and stem cells, and manufacturing technologies used in tissue engineering in the oral maxillofacial region, especially in China. Materials and Methods: Data for this review were identified by searches of Web of Science and PubMed, and references from relevant articles using the search terms "biomaterials", "oral tissue regeneration", "bioactive factors" and "stem cells". Only articles published in English between 2013 and 2018 were included. Conclusion: The combination of stem cells, bioactive factors and 3D scaffolds could be of far‐reaching significance for the future therapies in tissue repair or tissue regeneration. Furthermore, the review also mentions issues that need to be solved in the application of these biomedicines. [ABSTRACT FROM AUTHOR]

In order to promote the industrialization of medical textiles, the classification and preparation methods of medical textiles were reviewed. The preparation method, application and research status and prospects of medical textiles were analyzed from three aspects: in vitro treatment, in vivo implantation, and health carc and protection. The future research direction were reviewed. It is believed that medical textiles are the most potential sub-species of industrial textiles and are developing in the direction of composite, miniaturization, functionalization and degradability. The comprehensive technical performance of China's high-end medical textiles needs to be further improved, especially in terms of implanted textiles, there is a gap with advanced countries, and the core technology still needs to be broken through. [ABSTRACT FROM AUTHOR]

BACKGROUND: In order to solve the problem that the clinical application of liver transplantation is limited by the shortage of supply sources of liver, scientists from all over the world are actively exploring and have successively studied and developed technical means such as artificial liver, tissue-engineered liver and xenotransplantation. It can be used as a corrective or alternative treatment for liver failure. OBJECTIVE: To expound the development history, research status and future expectation of repair and alternative treatment for liver failure. METHODS: Relevant articles published from 2000 to 2019 were searched in the Web of Science and WanFang databases. The keywords were "active liver, liver tissue engineering, hepatic failure" in English and Chinese, respectively. RESULTS AND CONCLUSION: For advanced liver diseases such as liver failure, there are some repair and alternative treatments, including in situ liver transplantation, cell transplantation, artificial liver system, and tissue-engineered liver. To date, a number of hospitals and institutions in China have independently developed artificial liver devices. Although bioartificial liver and mixed artificial liver have shown good prospects in the treatment of liver failure, most of them are still in the experimental stage of animals. Further investigations on the development of bioreactors to enhance cell survival in scaffolds are necessary. Tissue-engineered liver constructed by biological materials and seed cells can to some extent simulate the physiological functions of liver synthesis, detoxification, metabolism, and secretion, which can be transplanted into the body to treat end-stage liver disease. It is a research hotspot in the field of tissue function. Efforts to solve the clotting problem and to promote the vascular formation of scaffold are warranted in this field. Xenograft is the best way to solve the serious shortage of human organ donors, but there is still a long way for this technique away from clinical application. [ABSTRACT FROM AUTHOR]

BACKGROUND: Our previous study confirmed that BTO/P(VDF-TrFE) piezoelectric nanocomposita membrane containing 5%BTO (BaTO3, BTO) nanoparticles could significantly promote bone marrow mesenchymal stem cells (BMSCs) adhesion, growth, osteogenic differentiation and repair of bone defects due to its bionic potential. However, for clinical applications, it is not clear whether there is any difference between the bone repair effect of this material as a guide for tissue regeneration and that of the existing clinically non-degradable membrane products. OBJECTIVE: To compare the effects of BTO/P(VDF-TrFE) piezoelectric nano-composne membrane materials with commercial PTFE membrane in repairing critical-sized defects of SD rat skull. METHODS: BTO/P(VDF-TrFE) piezoelectric nanocomposne membrane containing 5% BTO nanoparticles was prepared by solution casting method. Scanning electron microscope, atomic force microscope and water contact angle measuring instrument were used to observe the surface morphology, measure the surface roughness and surface hydrophilicity and hydrophobicity of the material. In SD rats (purchased from the Laboratory Animal Center, Beijing University Hospital of Stomatology, China), a 5-mm sized full-thick bone defect was made on both sides of the sagittal suture of the skull. The left bone defect was covered with PTFE membrane (control group). The right bone defect was covered with BTO/P(VDF-TrFE) piezoelectric nano-composita membrane (experimental group). At postoperative 4 and 12 weeks, micro-CT and histological methods were used to evaluate the repair of the skull defect in rats. This study was approved by Animal Ethics Committee, Beijing University Hospital of Stomatology. RESULTS AND CONCLUSION: The piezoelectric nanocomposite membrane had smooth and dense surface and BTO nanoparticles were evenly distributed. PTFE membrane was composed of loose coarse fibers. The piezoelectric nanocomposite membrane had lower surface roughness (P< 0.001) and higher hydrophilicity (P< 0.001) than PTFE membrane. Micro-CT and histological results showed that at 4 weeks after surgery, new bone formation was found in both groups, but new bone formation was more obvious in the center of the defect in the experimental group than in the control group. At 12 weeks after surgery, bone defects healed in both groups, but the maturity of newly formed bone in the experimental group was greater than that in the control group. These results suggest that BTO/P(VDF-TrFE) piezoelectric nanocomposite membrane containing 5%BTO (BaTO3, BTO) nanoparticles can be used as a membrane guiding tissue regeneration. [ABSTRACT FROM AUTHOR]

Objectives. This study aims to evaluate the changes of development trends and research hotspots of biomaterials research from 2013 to 2017, which can identify the general information of papers and explore the changes of research content, thus providing perspectives for the development of biomaterials in China and other countries. Methods. Data of the paper were retrieved from the Web of Science Core Collection, and then analyzed by the bibliometric and CiteSpace visualization analysis. Results. It was found that a total of 3,839 related papers had been published from the year 2013 to 2017. The analysis of the articles showed that the annual quantity and quality of the articles in the biomaterials research have been increasing since 2013, and the Wang L / Chinese Academy of Sciences were the most productive author/institution. Meanwhile, the keywords “in vitro”, “scaffold”, “nanoparticle”, “mechanical property”, and “biocompatibility” have the relatively higher frequency, and the keywords “apatite”, “deposition”, and “surface modification” have the strongest burst citation. Conclusions. After statistics and analysis, we found that biomaterials is a promising research field. The study may be helpful in understanding research trends in this field. [ABSTRACT FROM AUTHOR]

Owing to its subtropical or tropical environment and climate, South China is home to unique agricultural crops such as sugar cane, pineapple, banana, cassava, and rice, which generate a large amount of lignocellulosic agricultural wastes during agricultural as well as associated industrial processing. The efficient utilization ol these wastes will have a significant impact on the economy and sustainable development oi South China. This paper reviews the research investigations conducted both in China and elsewhere on the conversion oi wastes from these subtropical or tropical agricultural crops into useful chemicals, energy, and biomaterials. The goal oi this paper is to pnmiote and summarize the extensive investigations on these agricultural wastes for the development of biorefinerv. [ABSTRACT FROM AUTHOR]

Rice husk is an abundant agricultural by-product with the annual output of 120 and 40 million tons in the world and China, respectively. The common disposal method of rice husk in China has caused the pollution. This manuscript deals with a new method of comprehensively utilizing rice husk, by which hazardous materials are avoided to release. 100.3, 219.4, 50.1 and 170.5 g of d -xylose, organosolv lignin, ethanol and superfine silica are consecutively prepared from 1000 g of rice husk. This new method is helpful to resolving the problem of pollution and waste aroused by rice husk. [ABSTRACT FROM AUTHOR]

Straw is considered to be a renewable resource for bioenergy and biomaterial. However, about 70% of straw is burned in fields, which causes serious air pollution in China. In this study, a life cycle assessment (LCA) model, together with emergy evaluation, was built to compare four straw applications after harvest vs. direct burning, including bioethanol (BE), combined heat and power plant (CHP), corrugated base paper (CP), and medium-density fiberboard (MDF). The results showed that BE and MDF would avoid greenhouse gas (GHG) emissions by 82% and 36%, respectively, while CHP and CP would emit 57% and 152% more GHG, respectively, compared with direct straw burning. Bioethanol had the highest renewability indicator (RI) of 47.7%, and MDF obtained the greatest profit of 657 Yuan·bale-1. The applications CHP and CP had low RI (< 10.3%) and profit (< 180 Yuan·bale-1). Due to water recycling and electrical power as a coproduct, BE had the lowest value (3 ? 1011 sej·Yuan-1) of EmPM (emergy per unit money profit); the EmPM value of CP was 18.6 times higher than that of BE. The four straw applications would also greatly reduce particles emission (57 to 98%) to air. BE was judged to be the most environmentally friendly application among the four straw applications. Imposing a carbon tax would encourage investment in BE, but discourage the applications CHP and CP. [ABSTRACT FROM AUTHOR]

Background: On 19 February 2013, the first patient infected with a novel influenza A H7N9 virus from an avian source showed symptoms of sickness. More than 349 laboratory-confirmed cases and 109 deaths have been reported in mainland China since then. Laboratory-confirmed, human-to-human H7N9 virus transmission has not been documented between individuals having close contact; however, this transmission route could not be excluded for three families. To control the spread of the avian influenza H7N9 virus, we must better understand its pathogenesis, transmissibility, and transmission routes in mammals. Studies have shown that this particular virus is transmitted by aerosols among ferrets. Methods: To study potential transmission routes in animals with direct or close contact to other animals, we investigated these factors in a murine model. Results: Viable H7N9 avian influenza virus was detected in the upper and lower respiratory tracts, intestine, and brain of model mice. The virus was transmissible between mice in close contact, with a higher concentration of virus found in pharyngeal and ocular secretions, and feces. All these biological materials were contagious for naïve mice. Conclusions: Our results suggest that the possible transmission routes for the H7N9 influenza virus were through mucosal secretions and feces. [ABSTRACT FROM AUTHOR]

Osteoporotic fractures, also known as fragility fractures, are prevalent in the elderly and bring tremendous social burdens. Poor bone quality, weak repair capacity, instability, and high failure rate of internal fixation are main characteristics of osteoporotic fractures. Osteoporotic bone defects are common and need to be repaired by appropriate materials. Proximal humerus, distal radius, tibia plateau, calcaneus, and spine are common osteoporotic fractures with bone defect. Here, the consensus from the Osteoporosis Group of Chinese Orthopaedic Association concentrates on the epidemiology, characters, and management strategies of common osteoporotic fractures with bone defect to standardize clinical practice in bone repair of osteoporotic fractures., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The reviewer MY declared a shared parent affiliation with the authors ZS and DW at the time of review., (Copyright © 2022 Zhang, Hu, Chen, Wang, Cao, Dong, Shi, Chen, Xiong, Zhang, Zhang, Yu, Chen, Wang, Tong, Liu, Zhang, Zhou, Niu, Yang, Zhang, Wang, Chen, Jia, Yang, Zhang, Zhang, Miao, Sun, Shen, Yu, Yang, Zhang, Wang, Liu, Zhang and Su.)

The article discusses the Chinese government's announcement of national regulations for study and transport of human biological material containing DNA, intended to encourage research and development of drugs and medical treatments.

Bone resorption can negatively influence the osseointegration of dental implants. Barrier membranes for guided bone regeneration (GBR) are used to exclude nonosteogenic tissues from influencing the bone healing process. In addition to the existing barrier membranes available on the market, a growing variety of membranes for GBR with tailorable physicochemical properties are under preclinical evaluation. Hence, the aim of this review is to provide a comprehensive description of materials used for GBR and to report the main industrial and regulatory aspects allowing the commercialization of these medical devices (MDs). In particular, a summary of the main attributes defining a GBR membrane is reported along with a description of commercially available and under development membranes. Finally, strategies for the scaling-up of the manufacturing process and the regulatory framework of the main MD producers (USA, EU, Japan, China, and India) are presented. The description of the regulatory approval process of GBR membranes is representative of the typical path that medium- to high-risk MDs have to follow for an effective medical translation, which is of fundamental importance to increase the impact of biomedical research on public health., (© 2020 Wiley-VCH GmbH.)

Silk is mostly known as a luxurious textile, which originates from silkworms first cultivated in China. A deeper look into the variety of silk reveals that it can be used for much more, in nature and by humanity. For medical purposes, natural silks were recognized early as a potential biomaterial for surgical threads or wound dressings; however, as biomedical engineering advances, the demand for high-performance, naturally derived biomaterials becomes more pressing and stringent. A common problem of natural materials is their large batch-to-batch variation, the quantity available, their potentially high immunogenicity, and their fast biodegradation. Some of these common problems also apply to silk; therefore, recombinant approaches for producing silk proteins have been developed. There are several research groups which study and utilize various recombinantly produced silk proteins, and many of these have also investigated their products for biomedical applications. This review gives a critical overview over of the results for applications of recombinant silk proteins in biomedical engineering., (© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Enzyme is an efficient and green biocatalyst, and widely used in many areas. Immobilized enzyme is superior to its free form in a variety of properties. Enzyme immobilization studies started in the 1970s in China. Till now, immobilized enzymes are widely applied in the fields of food, medical, energy, environmental management, among others. However, there are still some defects such as no universal method and the high cost. Therefore, based on the relatively mature traditional immobilization technologies, efforts have been made to innovate immobilization technologies. As a result, many new immobilization technologies focusing on new carriers and methods are continuously generated. Coupling with more than ten years' study on enzyme immobilization, we present here recent development and application of new immobilization technologies, as well as suggestions to future development of immobilization technology.