scholarly journals Streptomyces as Potential Synthetic Polymer Degraders: A Systematic Review

2021 ◽  
Vol 8 (11) ◽  
pp. 154
Author(s):  
Maria Fernanda Rodríguez-Fonseca ◽  
Jeysson Sánchez-Suárez ◽  
Manuel Fernando Valero ◽  
Sonia Ruiz-Balaguera ◽  
Luis Eduardo Díaz
Keyword(s):  
Systematic Review ◽  
Waste Management ◽  
Carbon Cycle ◽  
Synthetic Polymers ◽  
Synthetic Polymer ◽  
Ecological Niches ◽  
Stages Of Development ◽  
Field Of Study ◽  
Waste Accumulation ◽  
Streptomyces Genus

The inherent resistance of synthetic plastics to degradation has led to an increasing challenge of waste accumulation problem and created a pollution issue that can only be addressed with novel complementary methods such as biodegradation. Since biocontrol is a promising eco-friendly option to address this challenge, the identification of suitable biological agents is a crucial requirement. Among the existing options, organisms of the Streptomyces genus have been reported to biodegrade several complex polymeric macromolecules such as chitin, lignin, and cellulose. Therefore, this systematic review aimed to evaluate the potential of Streptomyces strains for the biodegradation of synthetic plastics. The results showed that although Streptomyces strains are widely distributed in different ecosystems in nature, few studies have explored their capacity as degraders of synthetic polymers. Moreover, most of the research in this field has focused on Streptomyces strains with promising biotransforming potential against polyethylene-like polymers. Our findings suggest that this field of study is still in the early stages of development. Moreover, considering the diverse ecological niches associated with Streptomyces, these actinobacteria could serve as complementary agents for plastic waste management and thereby enhance carbon cycle dynamics.

scholarly journals The impact of Zn-doped synthetic polymer materials on bone regeneration: a systematic review

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Siyi Wang ◽  
Rong Li ◽  
Dandan Xia ◽  
Xiao Zhao ◽  
Yuan Zhu ◽  
...  
Keyword(s):  
Systematic Review ◽  
Bone Formation ◽  
Bone Regeneration ◽  
Osteogenic Differentiation ◽  
Synthetic Polymers ◽  
Synthetic Polymer ◽  
Polymer Materials ◽  
In Vivo Experiments

Abstract Introduction To repair bone defects, a variety of bone substitution materials have been used, such as ceramics, metals, natural and synthetic polymers, and combinations thereof. In recent decades, a wide range of synthetic polymers have been used for bone regeneration. These polymers have the advantages of biocompatibility, biodegradability, good mechanical properties, low toxicity, and ease of processing. However, when used alone, they are unable to achieve ideal bone formation. Incorporating zinc (Zn) into synthetic polymers has been considered, as previous studies have shown that Zn2+ promotes stem cell osteogenesis and mineral deposition. The purpose of this systematic review was to provide an overview of the application and effectiveness of Zn in synthetic polymers for bone regeneration, whether used alone or in combination with other biomaterials. This study was performed according to the PRISMA guidelines. Materials and methods A search of the PubMed, Embase, and the Cochrane Library databases for articles published up to June 2020 revealed 153 relevant studies. After screening the titles, abstracts, and full texts, 13 articles were included in the review; 9 of these were in vitro, 3 were in vivo, and 1 included both in vitro and in vivo experiments. Results At low concentrations, Zn2+ promoted cell proliferation and osteogenic differentiation, while high-dose Zn2+ resulted in cytotoxicity and inhibition of osteogenic differentiation. Additionally, one study showed that Zn2+ reduced apatite formation in simulated body fluid. In all of the in vivo experiments, Zn-containing materials enhanced bone formation. Conclusions At appropriate concentrations, Zn-doped synthetic polymer materials are better able to promote bone regeneration than materials without Zn.

scholarly journals Effectiveness of trauma care systems at different stages of development in reducing mortality: a systematic review and meta-analysis protocol

BMJ Open ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. e047439
Author(s):  
Rayan Jafnan Alharbi ◽  
Virginia Lewis ◽  
Sumina Shrestha ◽  
Charne Miller
Keyword(s):  
Systematic Review ◽  
Trauma Care ◽  
Data Extraction ◽  
Meta Analysis ◽  
Trauma System ◽  
Secondary Data ◽  
Trauma Centre ◽  
Trauma Patients ◽  
Trauma Systems ◽  
Stages Of Development

IntroductionThe introduction of trauma systems that began in the 1970s resulted in improved trauma care and a decreased rate of morbidity and mortality of trauma patients. Worldwide, little is known about the effectiveness of trauma care system at different stages of development, from establishing a trauma centre, to implementing a trauma system and as trauma systems mature. The objective of this study is to extract and analyse data from research that evaluates mortality rates according to different stages of trauma system development globally.Methods and analysisThe proposed review will comply with the checklist of the ‘Preferred reporting items for systematic review and meta-analysis’. In this review, only peer-reviewed articles written in English, human-related studies and published between January 2000 and December 2020 will be included. Articles will be retrieved from MEDLINE, EMBASE and CINAHL. Additional articles will be identified from other sources such as references of included articles and author lists. Two independent authors will assess the eligibility of studies as well as critically appraise and assess the methodological quality of all included studies using the Cochrane Risk of Bias for Non-randomised Studies of Interventions tool. Two independent authors will extract the data to minimise errors and bias during the process of data extraction using an extraction tool developed by the authors. For analysis calculation, effect sizes will be expressed as risk ratios or ORs for dichotomous data or weighted (or standardised) mean differences and 95% CIs for continuous data in this systematic review.Ethics and disseminationThis systematic review will use secondary data only, therefore, research ethics approval is not required. The results from this study will be submitted to a peer-review journal for publication and we will present our findings at national and international conferences.PROSPERO registration numberCRD42019142842.

scholarly journals Imperatives for the formation and development of the circular economy and global waste management

2021 ◽  
Vol 255 ◽  
pp. 01034
Author(s):  
Inna Khomenko ◽  
Marina Vuychenko ◽  
Maryna Gomeniuk ◽  
Yurii Mazur ◽  
Oksana Haidai
Keyword(s):  
Resource Management ◽  
Waste Management ◽  
Public Administration ◽  
National Economy ◽  
Circular Economy ◽  
Business Models ◽  
Ecological Problem ◽  
Circular Model ◽  
The World ◽  
Waste Accumulation

The world ecological problem of waste accumulation, environmental pollution and the need to develop a circular economy are described. The aim of the article is to show the advantage of using a circular economy in the management of the national economy. It is substantiated that resource management should radically change from a linear model of accept-use-dispose to a more stable, circular model. It is proved that the principles of circular economy are not based on the management of material and waste flows, but on more valuable methods, such as maintenance, recycling and reuse. Different models of circular economy and their shortcomings are considered. Based on practical world experience in implementing the concept of circular economy, 5 main circular business models are identified. It has been established that circular supply chains that minimize waste and seek to reuse, repair and recycle where waste cannot be prevented should be more sustainable than the linear systems they replace. It was found that in the absence of effective resource management, the current environmental situation will lead to fatal consequences, which confirms the need for public administration to ensure the use of a circular economy.

Prospects for the Balanced Development of the Waste Management System in Ukraine

2021 ◽  
pp. 097215092110347
Author(s):  
Iryna Kolodiichuk ◽  
Yuriy Dubnevych ◽  
Volodymyr Kolodiichuk ◽  
Vasyl Dmytriv
Keyword(s):  
Waste Management ◽  
Management System ◽  
Management Systems ◽  
Waste Generation ◽  
Balanced Development ◽  
Waste Management System ◽  
Environmental Consequences ◽  
Territorial Structure ◽  
Waste Accumulation ◽  
Management Issues

This article outlines the problem of waste accumulation as well as the associated environmental consequences in Ukraine due to the disparities between waste generation and utilization capacities. The analysis of quantitative parameters of waste generation sources and the territorial structure of Ukraine’s utilization capacities was carried out, and the spatial assessment of waste management system balance within regions was made. The work also identifies stages of territorially balanced management systems formation within the scope of current recycling technologies in the regional dimension. Methodological approaches to researching the balance conditions of waste management systems at the regional level are substantiated, which presupposes a mathematical model of these processes through the development of a system of equations, which depending on the tasks determine either the timing of the outlined phases of solving waste management issues based on available investment resources, or the amount of funds required to ensure proper timing of the innovative disposal facilities commissioning.

scholarly journals A systematic review of recent developments in disaster waste management

2019 ◽  
Vol 235 ◽  
pp. 822-840 ◽  
Author(s):  
Fanshun Zhang ◽  
Cejun Cao ◽  
Congdong Li ◽  
Yang Liu ◽  
Donald Huisingh
Keyword(s):  
Systematic Review ◽  
Waste Management ◽  
Recent Developments

Composite Systems of Lignocellulosics with Synthetic Polymers

1990 ◽  
Vol 197 ◽  
Author(s):  
Ramani Narayan ◽  
Robert P. Neu
Keyword(s):  
Mechanical Properties ◽  
Interfacial Tension ◽  
Cellulose Acetate ◽  
Thermal Analyses ◽  
Synthetic Polymers ◽  
Synthetic Polymer ◽  
Composite Systems ◽  
Morphological Studies ◽  
Type Of Behavior ◽  
Poor Adhesion

ABSTRACTIncompatible polymer blends are known to have inadequate mechanical properties due to poor adhesion and high interfacial tension between the phases. One such blend that displays this type of behavior is the cellulose acetate-polystyrene blend and is typical of lignocellulosic-synthetic polymer blend systems. Tailor-made cellulose acetate-polystyrene graft copolymers have been synthesized and used as compatibilizers (emulsifiers) to reduce the interfacial tension and improve interfacial mixing. Thermal analyses and morphological studies of the blends with and without the graft copolymer demonstrated that this was indeed the case.

scholarly journals Poly(Vinyl Alcohol) Recent Contributions to Engineering and Medicine

2020 ◽  
Vol 4 (4) ◽  
pp. 175
Author(s):  
Dorel Feldman
Keyword(s):  
Vinyl Alcohol ◽  
Dye Removal ◽  
Chemical Separation ◽  
Drug Carriers ◽  
Synthetic Polymers ◽  
Synthetic Polymer ◽  
Poly Vinyl Alcohol ◽  
Numerous Application ◽  
Separation Element ◽  
Hydrolysis Of

Poly(vinyl alcohol) (PVA) is a thermoplastic synthetic polymer, which, unlike many synthetic polymers, is not obtained by polymerization, but by hydrolysis of poly(vinyl acetate) (PVAc). Due to the presence of hydroxylic groups, hydrophilic polymers such as PVA and its composites made mainly with biopolymers are used for producing hydrogels that possess interesting morphological and physico-mechanical features. PVA hydrogels and other PVA composites are studied in light of their numerous application for electrical film membranes for chemical separation, element and dye removal, adsorption of metal ions, fuel cells, and packaging. Aside from applications in the engineering field, PVA, like other synthetic polymers, has applications in medicine and biological areas and has become one of the principal objectives of the researchers in the polymer domain. The review presents a few recent applications of PVA composites and contributions related to tissue engineering (repair and regeneration), drug carriers, and wound healing.

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