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  • Article
  • Open Access
608 Views
15 Pages

Assessment of IAS and NIAS in Plasma-Treated Biopolymer Films: Implications for Food Packaging Safety and Quality

  • Jessica Fernanda Pereira,
  • Maciel Lima Barbosa,
  • Filomena Silva,
  • Cristina Nerin,
  • Sandra Andrea Cruz and
  • Paula Vera

4 March 2026

Biopolymers are increasingly explored as safer and more sustainable food packaging materials. This study evaluated the migration behavior of intentionally and non-intentionally added substances (IAS and NIAS), as well as the safety of gelatin and xan...

  • Article
  • Open Access
10 Citations
3,849 Views
15 Pages

28 June 2023

Superinfection exclusion (SIE) is an antagonistic interaction between identical or closely related viruses in host cells. Previous studies by us and others led to the hypothesis that SIE was elicited by one or more proteins encoded in the genomes of...

  • Review
  • Open Access
144 Citations
24,818 Views
43 Pages

24 June 2021

Several food contact materials (FCMs) contain non-intentionally added substances (NIAS), and most of the substances that migrate from plastic food packaging are unknown. This review aimed to situate the main challenges involving unknown NIAS in plast...

  • Article
  • Open Access
35 Citations
5,515 Views
11 Pages

The Regulation of Nitrate Reductases in Response to Abiotic Stress in Arabidopsis

  • Xianli Tang,
  • Yang Peng,
  • Zheng Li,
  • Hongwei Guo,
  • Xinli Xia,
  • Bosheng Li and
  • Weilun Yin

21 January 2022

The two homologous genes, NIA1 and NIA2, encode nitrate reductases in Arabidopsis, which govern the reduction of nitrate to nitrite. This step is the rate-limiting step of the nitrate assimilation and utilization. Therefore, the regulation of NIA1 an...

  • Article
  • Open Access
76 Citations
8,132 Views
15 Pages

Isoform-Specific NO Synthesis by Arabidopsis thaliana Nitrate Reductase

  • Marie Agatha Mohn,
  • Besarta Thaqi and
  • Katrin Fischer-Schrader

16 March 2019

Nitrate reductase (NR) is important for higher land plants, as it catalyzes the rate-limiting step in the nitrate assimilation pathway, the two-electron reduction of nitrate to nitrite. Furthermore, it is considered to be a major enzymatic source of...

  • Review
  • Open Access
8 Citations
3,804 Views
29 Pages

Environmental challenges, high safety risks and operational inefficiencies are some of the issues facing the mining sector. The paper offers an integrated viewpoint to address these issues by combining swarm robotics, nature-inspired algorithms (NIAs...

  • Article
  • Open Access
11 Citations
4,969 Views
11 Pages

Release of Selected Non-Intentionally Added Substances (NIAS) from PET Food Contact Materials: A New Online SPE-UHPLC-MS/MS Multiresidue Method

  • Riccardo Aigotti,
  • Nicola Giannone,
  • Alberto Asteggiano,
  • Enrica Mecarelli,
  • Federica Dal Bello and
  • Claudio Medana

Food contact materials (FCMs) are an underestimated source of food chemical contaminants and a potentially relevant route of human exposure to chemicals that are harmful to the endocrine system. Foods and water are the main sources of exposure due to...

  • Article
  • Open Access
12 Citations
2,865 Views
15 Pages

2 July 2020

In this paper, the Novel Immune Algorithm (NIA) is proposed for an optimal design of electrical machines. By coupling the conventional Immune Algorithm and Steepest Descent Method, the NIA can perform fast and exact convergence to both global solutio...

  • Article
  • Open Access
43 Citations
16,918 Views
18 Pages

Experimental and Computational Studies on Non-Covalent Imprinted Microspheres as Recognition System for Nicotinamide Molecules

  • Roberta Del Sole,
  • Maria Rosaria Lazzoi,
  • Mario Arnone,
  • Fabio Della Sala,
  • Donato Cannoletta and
  • Giuseppe Vasapollo

17 July 2009

Molecularly imprinted microspheres obtained by precipitation polymerization using nicotinamide (nia) as template have been prepared and characterised by SEM. How various experimental parameters can affect microsphere morphology, reaction yield and re...

  • Article
  • Open Access
24 Citations
6,375 Views
15 Pages

Nitrate Reductases Are Relocalized to the Nucleus by AtSIZ1 and Their Levels Are Negatively Regulated by COP1 and Ammonium

  • Joo Yong Kim,
  • Bong Soo Park,
  • Sang Woo Park,
  • Han Yong Lee,
  • Jong Tae Song and
  • Hak Soo Seo

Nitrate reductases (NRs) catalyze the first step in the reduction of nitrate to ammonium. NR activity is regulated by sumoylation through the E3 ligase activity of AtSIZ1. However, it is not clear how NRs interact with AtSIZ1 in the cell, or how nitr...

  • Article
  • Open Access
967 Views
14 Pages

Identification and Expression Patterns of Four Key Nitrogen Assimilation Enzyme Gene Families in Malus domestica

  • Tong Li,
  • Longxin Luo,
  • Zhi Li,
  • Ziquan Feng,
  • Qi Zhang,
  • Shuo Ma,
  • Xinyi Li,
  • Huaina Gao,
  • Minmin Zhou and
  • Yuanyuan Li
  • + 3 authors

5 November 2025

Nitrogen assimilation is vital for apple growth, yield, and quality, with nitrate reductase (NIA), nitrite reductase (NIR), glutamine synthetase (GS), and glutamate synthase (GOGAT) serving as key regulatory enzymes. This study systematically identif...

  • Article
  • Open Access
9 Citations
4,666 Views
31 Pages

24 September 2019

The leaching of chemicals by materials has been integrated into risk management procedures of many sectors where hygiene and safety are important, including food, medical, pharmaceutical, and biotechnological applications. The approaches focus on dir...

  • Proceeding Paper
  • Open Access
1,338 Views
9 Pages

The aspergilli comprise a diverse group of filamentous fungi spanning over 200 million years of evolution. In this work, we report a clarification of the phylogenetic relationship between A. carbonarius and A. tubingensis via the screening of ITS-5.8...

  • Article
  • Open Access
4 Citations
4,620 Views
11 Pages

Phthalates are the synthetic chemical plasticizers with the most varied uses and are a source of concern due to their toxicity and ubiquity, so much so that even plasticizer-free polymers can contain them as non-intentionally added substances (NIAS)....

  • Article
  • Open Access
891 Views
14 Pages

Nitrate Reductase Genes AtNIA1 and AtNIA2 Confer Heat Stress Resilience via ROS Homeostasis and HSP Expression in Arabidopsis

  • Nusrat Jahan Methela,
  • Mohammad Shafiqul Islam,
  • Mahir Faysal,
  • Moon-Sub Lee,
  • Byung-Wook Yun and
  • Bong-Gyu Mun

11 March 2026

Heat stress is a key environmental factor that adversely affects plant growth, development, and productivity. Nitrate reductase (NR), encoded by AtNIA1 and AtNIA2, plays a crucial role in nitric oxide (NO) biosynthesis, which mediates stress response...

  • Article
  • Open Access
17 Citations
4,237 Views
20 Pages

Nitrogen Signaling Genes and SOC1 Determine the Flowering Time in a Reciprocal Negative Feedback Loop in Chinese Cabbage (Brassica rapa L.) Based on CRISPR/Cas9-Mediated Mutagenesis of Multiple BrSOC1 Homologs

  • Haemyeong Jung,
  • Areum Lee,
  • Seung Hee Jo,
  • Hyun Ji Park,
  • Won Yong Jung,
  • Hyun-Soon Kim,
  • Hyo-Jun Lee,
  • Seon-Geum Jeong,
  • Youn-Sung Kim and
  • Hye Sun Cho

Precise flowering timing is critical for the plant life cycle. Here, we examined the molecular mechanisms and regulatory network associated with flowering in Chinese cabbage (Brassica rapa L.) by comparative transcriptome profiling of two Chinese cab...

  • Article
  • Open Access
10 Citations
6,154 Views
23 Pages

Interlaboratory Study to Evaluate a Testing Protocol for the Safety of Food Packaging Coatings

  • Maricel Marin-Kuan,
  • Vincent Pagnotti,
  • Amaury Patin,
  • Julie Moulin,
  • Helia Latado,
  • Jesús Varela,
  • Yves-Alexis Hammel,
  • Thomas Gude,
  • Heidi Moor and
  • David T. Szabo
  • + 6 authors

7 February 2023

According to European regulations, migration from food packaging must be safe. However, currently, there is no consensus on how to evaluate its safety, especially for non-intentionally added substances (NIAS). The intensive and laborious approach, in...

  • Article
  • Open Access
1,820 Views
14 Pages

Screening of NIAS World Rice Core Collection for Seeds with Long Longevity as Useful Potential Breeding Materials Focusing on the Stability of Embryonic RNAs

  • Kalimullah Saighani,
  • Megumi Kashiwagi,
  • Safiullah Habibi,
  • Craig G. Simpson,
  • Tetsuya Yamada and
  • Motoki Kanekatsu

6 July 2024

Seed longevity is a crucial trait for the seed industry and genetic resource preservation. To develop excellent cultivars with extended seed lifespans, it is important to understand the mechanism of keeping seed germinability long term and to find us...

  • Article
  • Open Access
17 Citations
5,665 Views
16 Pages

2 August 2022

The aim of the present study was to develop and validate the Avoidant/Restrictive Food Intake Disorder Questionnaire—Parents Report (ARFID-Q-PR), a new tool to diagnose ARFID, based on a report submitted by Polish mothers of children aged 2 to...

  • Article
  • Open Access
2 Citations
3,812 Views
22 Pages

Polyethylene Transformation Chain: Evaluation of Migratable Compounds

  • Patricia Vázquez-Loureiro,
  • Nuria García-Batista,
  • Antonio Morreale,
  • Raquel Llorens-Chiralt,
  • Hernando Villar,
  • Beatriz Bacaicoa,
  • Ana Rodríguez Bernaldo de Quirós and
  • Raquel Sendón

23 January 2025

Polyethylene (PE) is a widely used material for packaging food. However, certain additives and their degradation products, which may be generated during transformation processes, may pose risks to consumers health if they migrate into food at levels...

  • Review
  • Open Access
73 Citations
11,725 Views
18 Pages

10 February 2020

Nowadays, food packaging is a crucial tool for preserving food quality and has become an inseparable part of our daily life. Strong consumer demand and market trends enforce more advanced and creative forms of food packaging. New packaging developmen...

  • Article
  • Open Access
2 Citations
906 Views
20 Pages

13 June 2025

Numerical Association Rule Mining (NARM), which simultaneously handles both numerical and categorical attributes, is a powerful approach for uncovering meaningful associations in heterogeneous datasets. However, designing effective NARM solutions is...

  • Article
  • Open Access
12 Citations
6,207 Views
14 Pages

18 February 2020

Dialkyl diketene dimers are used as sizing agents in the manufacture of paper and board for food contact applications to increase wetting stability. Unbound residues can hydrolyze and decarboxylate into dialkylketones. These non-intentionally added s...

  • Systematic Review
  • Open Access
7 Citations
3,891 Views
24 Pages

A Systematic Review: Migration of Chemical Compounds from Plastic Material Containers in Food and Pharmaceutical Fields

  • Laura Culleré,
  • Estela Sangüesa,
  • Laura Lomba,
  • María Pilar Ribate,
  • Estefanía Zuriaga and
  • Cristina B. García

11 November 2025

A systematic review was conducted on the migration of compounds from plastic containers in the food and pharmaceutical industries, using Web of Science databases and following PRISMA guidelines (Preferred Reporting Items for Systematic Reviews and Me...

  • Article
  • Open Access
44 Citations
11,318 Views
10 Pages

GC-MS Screening Analysis for the Identification of Potential Migrants in Plastic and Paper-Based Candy Wrappers

  • Soraya Galmán Graíño,
  • Raquel Sendón,
  • Julia López Hernández and
  • Ana Rodríguez-Bernaldo de Quirós

21 July 2018

Food packaging materials may be a potential source of contamination through the migration of components from the material into foodstuffs. Potential migrants can be known substances such as additives (e.g., plasticizers, stabilizers, antioxidants, et...

  • Article
  • Open Access
43 Citations
7,675 Views
20 Pages

6 October 2019

UV-curable inks, coatings, and adhesives are being increasingly used in food packaging systems. When exposed to UV energy, UV-photoinitiators (PI’s) present in the formulations produce free radicals which catalyze polymerization of monomers and...

  • Article
  • Open Access
3 Citations
6,526 Views
28 Pages

Migration Studies and Endocrine Disrupting Activities: Chemical Safety of Cosmetic Plastic Packaging

  • Elias Bou-Maroun,
  • Laurence Dahbi,
  • Laurence Dujourdy,
  • Pierre-Jacques Ferret and
  • Marie-Christine Chagnon

6 October 2023

The endocrine activity and endocrine disruptor (ED) chemical profiles of eleven plastic packaging materials covering five major polymer types (3PET, 1HDPE, 4LDPE, 2 PP, and 1SAN) were investigated using in vitro cell-based reporter-gene assays and a...

  • Article
  • Open Access
7 Citations
2,711 Views
14 Pages

The Mechanism of Resistance of EUROPEAN Plum to Plum pox virus Mediated by Hypersensitive Response Is Linked to VIRAL NIa and Its Protease Activity

  • Bernardo Rodamilans,
  • Johannes Hadersdorfer,
  • Zita Berki,
  • Beatriz García,
  • Michael Neumüller and
  • Juan Antonio García

10 April 2023

Plum pox virus (PPV) infects Prunus trees across the globe, causing the serious Sharka disease. Breeding programs in the past 20 years have been successful, generating plum varieties hypersensitive to PPV that show resistance in the field. Recently,...

  • Article
  • Open Access
619 Views
10 Pages

Growth Differentiation Factor 15 and Physical Function Impairment in the SardiNIA Study

  • Nicia I. Profili,
  • Edoardo Fiorillo,
  • Valeria Orrù,
  • Maria Benelli,
  • Francesco Cucca and
  • Alessandro P. Delitala

29 March 2026

Background: Sarcopenia is the age-related, progressive loss of strength, function, and skeletal muscle mass, which can be assessed with specific tests. The Growth differentiation factor 15 (GDF-15) has been proposed as a key biomarker of aging, and i...

  • Article
  • Open Access
7 Citations
3,224 Views
17 Pages

Utilizing Molecular Epidemiology and Citizen Science for the Surveillance of Lagoviruses in Australia

  • Nias Y. G. Peng,
  • Robyn N. Hall,
  • Nina Huang,
  • Peter West,
  • Tarnya E. Cox,
  • Jackie E. Mahar,
  • Hugh Mason,
  • Susan Campbell,
  • Tiffany O’Connor and
  • Maria Jenckel
  • + 5 authors

29 November 2023

Australia has multiple lagoviruses with differing pathogenicity. The circulation of these viruses was traditionally determined through opportunistic sampling events. In the lead up to the nationwide release of RHDVa-K5 (GI.1aP-GI.1a) in 2017, an exis...

  • Article
  • Open Access
2 Citations
3,253 Views
15 Pages

Residue K28 of Zika Virus NS5 Protein Is Implicated in Virus Replication and Antagonism of STAT2

  • Nias Y. G. Peng,
  • Julian D. J. Sng,
  • Yin Xiang Setoh and
  • Alexander A. Khromykh

The identification of four potential nonstructural 5 (NS5) residues—K28, K45, V335, and S749—that share the same amino acid preference in STAT2-interacting flaviviruses [Dengue virus (DENV) and Zika virus (ZIKV)], but not in STAT2-non-int...

  • Abstract
  • Open Access
2,423 Views
2 Pages

Zika Virus sfRNA Plays an Essential Role in the Infection of Insects and Mammals

  • Andrii Slonchak,
  • Leon E. Hugo,
  • Morgan Freney,
  • Alberto A Amarilla,
  • Sonja Hall-Mendelin,
  • Kexin Yan,
  • Francisco Torres,
  • Yin Xiang Setoh,
  • Nias Peng and
  • Alexander A Khromykh
  • + 5 authors

Similar to other flaviviruses, Zika virus (ZIKV) produces abundant subgenomic flavivirus RNA (sfRNA) derived from the 3’ untranslated region. The molecular mechanisms that determine the functions of sfRNA are currently not completely understood. Here...

  • Article
  • Open Access
17 Citations
6,579 Views
13 Pages

Helicase Domain of West Nile Virus NS3 Protein Plays a Role in Inhibition of Type I Interferon Signalling

  • Yin Xiang Setoh,
  • Parthiban Periasamy,
  • Nias Yong Gao Peng,
  • Alberto A. Amarilla,
  • Andrii Slonchak and
  • Alexander A. Khromykh

2 November 2017

West Nile virus (WNV) is a neurotropic flavivirus that can cause encephalitis in mammalian and avian hosts. In America, the virulent WNV strain (NY99) is causing yearly outbreaks of encephalitis in humans and horses, while in Australia the less virul...

  • Communication
  • Open Access
14 Citations
5,830 Views
10 Pages

Fetal Brain Infection Is Not a Unique Characteristic of Brazilian Zika Viruses

  • Yin Xiang Setoh,
  • Nias Y. Peng,
  • Eri Nakayama,
  • Alberto A. Amarilla,
  • Natalie A. Prow,
  • Andreas Suhrbier and
  • Alexander A. Khromykh

3 October 2018

The recent emergence of Zika virus (ZIKV) in Brazil was associated with an increased number of fetal brain infections that resulted in a spectrum of congenital neurological complications known as congenital Zika syndrome (CZS). Herein, we generated d...

  • Article
  • Open Access
124 Citations
9,485 Views
45 Pages

A Review of the Modification Strategies of the Nature Inspired Algorithms for Feature Selection Problem

  • Ruba Abu Khurma,
  • Ibrahim Aljarah,
  • Ahmad Sharieh,
  • Mohamed Abd Elaziz,
  • Robertas Damaševičius and
  • Tomas Krilavičius

31 January 2022

This survey is an effort to provide a research repository and a useful reference for researchers to guide them when planning to develop new Nature-inspired Algorithms tailored to solve Feature Selection problems (NIAs-FS). We identified and performed...

  • Review
  • Open Access
3 Citations
3,553 Views
16 Pages

15 November 2024

Near-infrared autofluorescence (NIA) is a non-invasive retinal imaging technique used to examine the retinal pigment epithelium (RPE) based on the autofluorescence of melanin. Melanin has several functions within RPE cells. It serves as a protective...

  • Article
  • Open Access
2 Citations
2,202 Views
17 Pages

Unveiling Niaprazine’s Potential: Behavioral Insights into a Re-Emerging Anxiolytic Agent

  • Hanna Trebesova,
  • Martina Monaco,
  • Sara Baldassari,
  • Giorgia Ailuno,
  • Edilio Lancellotti,
  • Gabriele Caviglioli,
  • Anna Maria Pittaluga and
  • Massimo Grilli

12 September 2024

Ongoing global research actions seek to comprehensively understand the adverse impact of stress and anxiety on the physical and mental health of both human beings and animals. Niaprazine (NIA) is a chemical compound that belongs to the class of piper...

  • Article
  • Open Access
30 Citations
5,455 Views
13 Pages

Nitrate Reductase-Mediated Nitric Oxide Regulates the Leaf Shape in Arabidopsis by Mediating the Homeostasis of Reactive Oxygen Species

  • Qiao-Na Pan,
  • Chen-Chen Geng,
  • Dan-Dan Li,
  • Shi-Wen Xu,
  • Dan-Dan Mao,
  • Saima Umbreen,
  • Gary John Loake and
  • Bei-Mi Cui

As a gaseous biological signaling molecule, nitric oxide (NO) regulates many physiological processes in plants. Over the last decades, this low molecular weight compound has been identified as a key signaling molecule to regulate plant stress respons...

  • Article
  • Open Access
37 Citations
4,793 Views
11 Pages

24 April 2019

In this work, two indazole derivatives, namely 5-aminoindazole (AIA) and 5-nitroindazole (NIA), were investigated as corrosion inhibitors for carbon steel in 1 M HCl solution by experimental and density functional theory (DFT) methods. The electroche...

  • Article
  • Open Access
2,187 Views
16 Pages

15 May 2025

Background: Previous studies have shown that ventilation strategies used in general anesthesia influence perioperative outcomes of video-assisted thoracoscopic surgery (VATS). This study investigated the perioperative effects of non-intubated anesthe...

  • Article
  • Open Access
23 Citations
6,129 Views
15 Pages

1 November 2021

A fast and automated approach has been developed for the tentative identification and risk assessment of unknown substances in plastic food contact materials (FCM) by GC-Q-Orbitrap HRMS. The proposed approach combines GC-HRMS full scan data acquisiti...

  • Article
  • Open Access
1 Citations
2,348 Views
12 Pages

Use of Bacterial Toxin–Antitoxin Systems as Biotechnological Tools in Plants

  • Bernardo Rodamilans,
  • Xiaofei Cheng,
  • Carmen Simón-Mateo and
  • Juan Antonio García

27 September 2024

Toxin–antitoxin (TA) systems in bacteria are key regulators of the cell cycle and can activate a death response under stress conditions. Like other bacterial elements, TA modules have been widely exploited for biotechnological purposes in diver...

  • Feature Paper
  • Article
  • Open Access
9 Citations
4,146 Views
14 Pages

Decoupling Capacitors Placement at Board Level Adopting a Nature-Inspired Algorithm

  • Stefano Piersanti,
  • Riccardo Cecchetti,
  • Carlo Olivieri,
  • Francesco de Paulis,
  • Antonio Orlandi and
  • Markus Buecker

Decoupling capacitors are fundamental keys for the reduction of transient noise in power delivery networks; their arrangement and values are crucial for reaching this goal. This work deals with the optimization of the decoupling capacitors of a power...

  • Article
  • Open Access
14 Citations
5,398 Views
11 Pages

28 August 2019

In this study, an accelerated migration test on food can coatings into food simulants was investigated. Food simulants covering a wide range of polarity were used to conduct migration tests at 60 °C with storage times ranging from 4 h to 30 days....

  • Article
  • Open Access
16 Citations
5,064 Views
25 Pages

Study on the Properties of PLA- and PP-Based Films for Food Applications Incorporating Orange Peel Extract from Agricultural by-Products

  • Ana Maria Tone,
  • Nuria Herranz Solana,
  • Muhammad Rehan Khan,
  • Angela Borriello,
  • Elena Torrieri,
  • Carmen Sánchez Reig and
  • F. María Monedero Prieto

29 April 2024

The aim of this work was to develop active packaging based on polypropylene (PP) and polylactic acid (PLA) matrices using a high value by-product extracted from orange peel as an active compound for food packaging applications. Different films with a...

  • Article
  • Open Access
3 Citations
2,101 Views
15 Pages

Optimized Method for Quantifying Bisphenols in Bottled Water and PET/rPET Matrices

  • Fabiana Di Duca,
  • Paolo Montuori,
  • Elvira De Rosa,
  • Immacolata Russo,
  • Raffaele Palladino,
  • Stefano Scippa,
  • Giuseppe Dadà,
  • Maria Triassi and
  • Sergi Díez

26 August 2025

The growing use of plastics in food packaging has raised concerns about chemical migration into consumables, posing potential health risks. Ensuring the safety of packaging materials is a critical public health priority. This study aimed to validate...

  • Review
  • Open Access
7 Citations
7,606 Views
29 Pages

Chemical Migration from Wine Contact Materials

  • Niki C. Maragou,
  • Alexandros Tzachristas,
  • Emmanouil D. Tsochatzis and
  • Nikolaos S. Thomaidis

25 July 2024

Wine quality and safety is affected by the food contact materials (FCMs) used. These materials are expected to protect the beverage from any chemical, physical, or biological hazard and preserve its composition stable throughout its shelf-life. Howev...

  • Article
  • Open Access
35 Citations
11,141 Views
19 Pages

Identification and Evaluation of (Non-)Intentionally Added Substances in Post-Consumer Recyclates and Their Toxicological Classification

  • Christian Rung,
  • Frank Welle,
  • Anita Gruner,
  • Arielle Springer,
  • Zacharias Steinmetz and
  • Katherine Munoz

9 February 2023

According to the European circular economy strategy, all plastic packaging placed on the market by 2030 has to be recyclable. However, for recycled plastics in direct contact with food, there are still major safety concerns because (non-)intentionall...

  • Article
  • Open Access
66 Citations
14,096 Views
20 Pages

28 October 2020

PET beverage bottles have been recycled and safely reprocessed into new food contact packaging applications for over two decades. During recollection of post-consumer PET beverage bottles, PET containers from non-food products are inevitably co-colle...

  • Article
  • Open Access
1 Citations
459 Views
33 Pages

21 May 2026

Recyclers worldwide face a common bottleneck: incoming mixed plastic bales are chemically opaque, yet the choice between mechanical recycling, chemical recycling, and energy recovery hinges on contaminant levels that cannot be judged by visual inspec...

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