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Environmental Nanotoxicology: Combatting the Minute Contaminants
by Patrick Omoregie Isibor Geetha Devi Alex Ajeh EnunekuEnvironmental Nanotoxicology: Combatting the Minute Contaminants is a comprehensive guide to the rapidly evolving field of nanotoxicology and its implications for environmental health and safety. This book results from the collaborative efforts of leading experts and researchers from diverse disciplines, aiming to thoroughly understand the interactions between nanomaterials and the environment and their potential impacts on the delicate balance of our ecosystems.Nanotechnology has witnessed remarkable innovations leading to the development of nanomaterials with novel properties and applications across various industries. Alongside these innovations, concerns have arisen about the potential risks that nanomaterials may pose to the environment and living organisms. This book addresses these concerns by comprehensively exploring the field's key concepts, principles, and methodologies. It includes case studies and offers insights into developing appropriate regulatoryframeworks and guidelines for the responsible use and disposal of nanomaterials. The book is a valuable resource for researchers and professionals working in nanotoxicology on the complex challenges posed by the intersection of nanomaterials and the environment. It is also an essential reference for students studying environmental science, toxicology, and nanotechnology.
Advancements in Urban Environmental Studies: Application of Geospatial Technology and Artificial Intelligence in Urban Studies (GIScience and Geo-environmental Modelling)
by Atiqur Rahman Shouraseni Sen Roy Swapan Talukdar ShahfahadAccording to UN estimates, approximately nearly half of the world's population now lives in cities and that figure is expected to rise to almost 70% by 2050. Cities now account for around 70% of worldwide greenhouse gas emissions, and this percentage is predicted to rise in the near future as a result of projected increases in global urbanization patterns. It is widely acknowledged that irrational urban planning and design can increase emissions while also exacerbating threats and risks, resulting in a slew of environmental issues such as urban heat islands, air pollution, flooding, amongst other issues, as well as environmental, social, and economic losses. Therefore, these concerns must be addressed promptly in order to cope up with these rising difficulties and make urban environments safer for residents. With the advancement of remote sensing technology and the use of current remote observation systems, urban data science, remote sensing, and artificialintelligence (AI), modeling and quantifying emergent difficulties in urban regions and urban systems have become easy. They aid in the quantitative analysis of urban shape, functions, and human behavior in cities. Harvesting data, developing models, and suggesting new methodologies will be aided by combining urban ecology with new breakthroughs in data science. This book is of great value to a diverse group of academicians, scientists, students, environmentalists, meteorologists, urban planners, remote sensing and GIS experts with a common interest in geospatial sciences within the earth environmental sciences, as well as human and social sciences.
Plastids: Methods and Protocols (Methods in Molecular Biology #2776)
by Eric MaréchalThis second edition volume expands on the previous edition with new and updated chapters that explore our current view on plastid evolution, structure, and function. The chapters in this book are organized into three parts and cover topics such as plastid evolution, plasticity, and functional and structural diversity; techniques used to visualize, fractionate, purify, and study primary plastids from plant materials, and secondary plastids; and methods to analyze plastids by integrated biology strategies based on genetics, genomics, proteomics, and lipidomics. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls.Cutting-edge and authoritative, Plastids: Methods and Protocols, Second Edition is a valuable resource that willhelp students, engineers, and researchers further explore and understand this fascinating organelle.
Proceedings of the 4th International Conference on Sustainability in Civil Engineering: ICSCE 2022, 25-27 November, Hanoi, Vietnam (Lecture Notes in Civil Engineering #344)
by Tung Nguyen-Xuan Thanh Nguyen-Viet Thanh Bui-Tien Tuan Nguyen-Quang Guido De RoeckThis book contains the proceedings of the 4th International Conference on Sustainability in Civil Engineering, ICSCE 2022, held on November 25–27, 2022, in Hanoi, Vietnam. It presents the expertise of scientists and engineers in academia and industry in the field of bridge and highway engineering, construction materials, environmental engineering, engineering in Industry 4.0, geotechnical engineering, structural damage detection and health monitoring, structural engineering, geographic information system engineering, traffic, transportation and logistics engineering, and water resources, estuary, and coastal engineering.
Architektur als Medium des Zukünftigen: Hörspiel, Film und Zeitschrift 1945–1955 (Media. Literaturwissenschaftliche Forschungen)
by Tanja RommelfangerDas Buch beschäftigt sich mit der Architektur der unmittelbaren Nachkriegszeit als Gegenstand medialer Repräsentation. Dabei bewegt es sich im Spannungsfeld von Germanistik, Architekturgeschichte und Medienwissenschaft. Anhand von Radiohörspielen, Architekturzeitschriften und Filmen geht es der Frage nach, wie Architektur in Szene gesetzt wird. Dabei bezieht die Analyse mit ein, wie diese im Hinblick auf die Konstruktion und den Aufbau einer neuen Zukunft mit bestehenden Diskursen der Moderne in Verbindung gebracht wird und problematische Bezüge zur nationalsozialistischen Vergangenheit aufweist. In Werken von Günter Eich (Träume, 1951), Otto Renner (BAU. Zeitschrift für wohnen, arbeiten, sich erholen, 1947) und mit einem anonymen Städtefilm (Stein auf Stein. Ein Land baut auf, 1949) werden wenig bekannte Kurzformen aufgegriffen, um deren Verknüpfung mit neuen Medienverbunden und soziopolitischen Diskursen zu erforschen. Die detaillierten Analysen - von Eichs „Fünftem Traum“ als Mediengeflecht von Text, Musik und Geräusch, der heute wenig bekannten, aber zu ihrer Zeit renommierten Architekturzeitschrift BAU als Medienverbund aus zirkulierenden und wiederaufbereiteten Fotografien, Zeichnungen, Texten und Typografie und dem Kurzfilm Stein auf Stein mit seinen intermedialen Bezügen u.a. zur Fotografie - stellen Querverbindungen zu vielen Figuren und Werken dieser Zeit her, in der die Architektur eine Neubewertung als vermittelnde Instanz zwischen Individuum und Gesellschaft erfährt.Davon ausgehend schließt die Autorin auf größere Problematiken, die die Öffentlichkeit in den frühen Nachkriegsjahren beschäftigten. Dabei weist sie Momente des Exzesses und der Überschreitung in den Werken auf, die in einer Zeit der Ressourcenknappheit, Medienregulierung und konfliktreicher Lizensierungspolitik entstanden sind. Auch der Umbruch im Mediengefüge durch die Einführung von Fernsehen und die moralisch aufgeladene Debatte über eine entnazifizierte Öffentlichkeit werden reflektiert. Das Buch geht auch ausführlich auf die Besatzungspolitik im teilautonomen Saarland ein und führt die französische Kolonialpolitik in Algerien indirekt über die Rezeption Le Corbusiers in den deutschen Diskurs ein.Das Buch richtet sich an Studierende und Forschende der Fachgebiete Literatur-, Medien- und Kulturwissenschaft, Kunstgeschichte und Architektur.
Cerebrospinal Fluid Diagnostics in Neurology: Paradigm Change in Brain Barriers, Immune System and Chronic Diseases (essentials)
by Hansotto ReiberThis Springer essential explains the theoretical foundations for knowledge-based interpretation of medical laboratory data. Self-organization of biological structure, non-linear dynamics of complex systems and immunological network theories make it possible to describe pathomechanisms and diagnostics, especially of chronic diseases, as an expression of a phenotypic biology and to develop concepts for causal therapies.The book shows how CSF diagnostics with a diagnostic report integrating all laboratory data can identify disease-typical patterns for the differential diagnosis of bacterial, viral, parasitic, oncological, chronic inflammatory, autoimmunological and psychiatric diseases. A CSF app is provided as a tutorial program.The translation from German was done with the help of artificial intelligence. A subsequent human revision was done primarily in terms of content.
Grundkurs Datenbankentwicklung: Von der Anforderungsanalyse zur komplexen Datenbankanfrage
by Stephan KleukerMit diesem Buch erhalten Studierende einen kompakten und praxisorientierten Einstieg, mit dem sie bereits früh im Studium sehr gut zurechtkommen. Die verschiedenen Phasen einer Datenbankentwicklung werden mit ihren Vorgehensweisen, Konzepten und möglichen Problemquellen vorgestellt. Gerade die Anforderungsanalyse und die Möglichkeit zur Erstellung mächtiger SQL-Anfragen werden als besonders praxisrelevante Aspekte betont. Durch die im zweiten Teil detailliert vorgestellte Integration von Datenbanken in die umgebende Software sind Studierende nach der Lektüre in der Lage, in Praxisprojekten erfolgreich mitzuarbeiten. Das Buch deckt inhaltlich eine Einführungsvorlesung vollständig ab. Die 5. Auflage wurde um das Thema JPA (Objekt-Relationale-Persistenz), Trigger in Java ergänzt. Zusätzlich werden Unterschiede zwischen Oracle, Maria DB, SQLite und Apache Derby erläutert. Neben vielen kleinen Beispielen zur Verdeutlichung einzelner Aspekte wird ein durchgehendes Beispiel genutzt. Alle Kapitel schließen mit Wiederholungsfragen und Übungsaufgaben, deren Lösungen online zum Download zur Verfügung stehen.
Goethe als Naturforscher im Urteil der Naturwissenschaft und Medizin des 19. Jahrhunderts: Themen, Texte, Titel
by Dietrich von EngelhardtGoethe als Naturforscher findet bei deutschen und ausländischen Naturforschern und Medizinern des 19. Jahrhunderts durchgängig Beachtung und führt zu einer Fülle spezifischer Goethe in dieser Hinsicht gewidmeten Studien mit Interpretationen und Beurteilungen – neben wiederholt vorkommenden knapperen Ausführungen oder kurzen Hinweisen in naturwissenschaftlichen und medizinischen Publikationen der Zeit. Übergreifende Veröffentlichungen über Goethe und die Romantik, über seine Stellung in Europa, über seine Beziehungen zu England, Frankreich, Italien, Spanien, den skandinavischen und slavischen Ländern behandeln meist nur seine literarischen und geisteswissenschaftlichen Werke und gehen allenfalls begrenzt auf seine naturwissenschaftlichen Beiträge und ihre Aufnahme in den Naturwissenschaften und Medizin ein. Diese fachspezifische Zurückhaltung gilt auch für Bibliographien der Übersetzungen deutscher Veröffentlichungen des 19. Jahrhunderts in europäische Sprachen; naturwissenschaftliche und medizinische Publikationen kommen in ihnen nicht oder nur sporadisch vor. Der vorliegende Band schließt diese Lücke. Neben einer umfassenden Bibliographie von 260 Titeln von Naturwissenschaftlern und Medizinern über Goethe als Naturforscher steht eine Wiedergabe von 48 entsprechenden nicht nur deutschen, sondern vor allem auch internationalen und oft an entlegenen Orten erschienenen Arbeiten.
Once Upon a Prime: The Wondrous Connections Between Mathematics and Literature
by null Sarah Hart‘A hugely entertaining and well-written tour of the links between math and literature. Hart’s lightness of touch and passion for both subjects make this book a delight to read. Bookworms and number-lovers alike will discover much they didn’t know about the creative interplay between stories, structure and sums.’ – Alex Bellos ‘This exuberant book will educate, amuse and surprise. It might even add another dimension to the way you read.’ – The Sunday Times We often think of mathematics and literature as polar opposites. But what if, instead, they were fundamentally linked? In this insightful, laugh-out-loud funny book, Once Upon a Prime, Professor Sarah Hart shows us the myriad connections between maths and literature, and how understanding those connections can enhance our enjoyment of both. Did you know, for instance, that Moby-Dick is full of sophisticated geometry? That James Joyce’s stream-of-consciousness novels are deliberately checkered with mathematical references? That George Eliot was obsessed with statistics? That Jurassic Park is undergirded by fractal patterns? That Sir Arthur Conan Doyle and Chimamanda Ngozi Adichie wrote mathematician characters? From sonnets to fairytales to experimental French literature, Once Upon a Prime takes us on an unforgettable journey through the books we thought we knew, revealing new layers of beauty and wonder. Professor Hart shows how maths and literature are complementary parts of the same quest, to understand human life and our place in the universe.
Haunted: (Michael Bennett 10). Michael Bennett is far from home – but close to danger (Michael Bennett #10)
by James Patterson_______________________________________You can take Michael Bennett out of New York City, but you can't take the cop out of Michael Bennett.Detective Michael Bennett is ready for a vacation after a series of crises push him, and his family, to the brink.He settles on an idyllic small town in the beautiful Maine woods. But just when Bennett thinks he can relax, he gets pulled into a case that has shocked the tight-knit community. Kids are disappearing with no explanation – until several bodies turn up in the woods. Far from the city streets he knows so well, Bennett is fighting to protect a town, the law, and the family that he loves above all else.
Worst Case: (Michael Bennett 3). One wrong answer will cost you your life… (Michael Bennett #3)
by James Patterson______________________One wrong answer means death...The son of one of New York's wealthiest families is snatched off the street. His parents can't save him, because this kidnapper isn't demanding money. Instead, he quizzes his prisoner on the price others pay for his life of luxury. In this exam, wrong answers are fatal.Detective Michael Bennett leads the investigation. With ten kids of his own, he can't begin to understand what could lead someone to target anyone's children. As another student disappears, one powerful family after another uses their leverage and connections to turn up the heat on the mayor, the press, anyone who will listen, to stop this killer. Their reach extends all the way to the FBI, who send their top Abduction Specialist, Agent Emily Parker. Bennett's work life - and love life - suddenly get even more complicated.Before Bennett has a chance to protest the FBI's intrusion on his case, the mastermind changes his routine. His plan leads up to the most deadly demonstration yet - one that could bring cataclysmic devastation to every inch of New York.
I, Michael Bennett: (Michael Bennett 5). New York’s top detective becomes a crime lord’s top target (Michael Bennett #5)
by James Patterson________________________What happens when the justice system comes under assault?Detective Michael Bennett arrests infamous South American crime lord Manuel Perrine in a deadly chase that leaves Bennett’s lifelong friend Hughie McDonough dead. From jail, the prisoner vows to rain terror down upon New York City - and to get revenge on Michael Bennett.Perrine's men create chaos: police officers are shot, judges murdered. As Bennett is engulfed in the struggle against this widening organised violence, he realises that not only is he being targeted, but that the lives of everyone he loves are under threat.
An African History of Africa: From the Dawn of Humanity to Independence
by Zeinab BadawiA RADIO 4 BOOK OF THE WEEK *Selected as a book to look out for in 2024 by the Guardian and The Rest is Politics*Everyone is originally from Africa, and this book is therefore for everyone.For too long, Africa’s history has been dominated by western narratives of slavery and colonialism, or simply ignored. Now, Zeinab Badawi sets the record straight.In this fascinating book, Badawi guides us through Africa’s spectacular history – from the very origins of our species, through ancient civilisations and medieval empires with remarkable queens and kings, to the miseries of conquest and the elation of independence. Visiting more than thirty African countries to interview countless historians, anthropologists, archaeologists and local storytellers, she unearths buried histories from across the continent and gives Africa its rightful place in our global story.The result is a gripping new account of Africa: an epic, sweeping history of the oldest inhabited continent on the planet, told through the voices of Africans themselves.
Alert: (Michael Bennett 8). New York is against the wall. Michael Bennett is against the clock. (Michael Bennett #8)
by James Patterson_______________________Every New Yorker's worst nightmare is about to become a reality.New York has seen more than its fair share of horrific attacks, but the city is about to be shaken in a way it never has before.Two devastating catastrophes hit in quick succession, putting everyone on edge. Detective Michael Bennett is given the near impossible task of hunting down the shadowy terror group responsible.Then a shocking assassination makes it clear that these inexplicable events are just the prelude to the biggest threat of all. Now Bennett is racing against the clock to save his beloved city – before the most destructive force he has ever faced tears it apart.
The Whispers: The explosive new novel from the bestselling author of The Push
by Ashley AudrainThe captivating new novel from the author of the explosive Sunday Times bestseller, THE PUSH'Spellbinding, a shimmering, visceral ride through the dark side of family' LISA JEWELL'I absolutely loved this book' MIRANDA COWLEY HELLER'A beautifully observed exploration of what it means to be a woman' SARAH PEARSE'Deeply thrilling and provocative . . a truly masterful novel' NITA PROSE'Thought-provoking and gripping, this is worthy of all the praise coming its way' HEAT, Book of the Week___________The incident happens in the middle of the night.Whitney Loverly’s place: the grandest house on Harlow Street.Friends, neighbours and the authorities gather to piece together the events of the last twenty-four hours.There’s talk of secrets, lies. Betrayals.Once the envy of all, is Whitney Loverly – CEO, wife, mother – about to fall?Behind closed doors the whispering has started.But where will it end? ___________The Whispers is a darkly psychological portrait of couples in crisis and families in free fall.'A chilling psychodrama about motherhood and community' i PAPER'You will devour this. A brilliant, honest read about families in crisis' Woman & Home'Riveting... a fearless deep dive into the real internal lives of women. The Whispers is a brilliant, deeply affecting novel you won't soon forget' Shari Lapena, bestselling author of The Couple Next Door'A masterwork: a page-turner, a searing emotional rollercoaster and a beautifully-written hymn to the pain, the love, the fury of motherhood . . . sensational' Rosie Walsh, bestselling author of The Man Who Didn't Call
The Lost Boy
by Duncan StaffBetween 1963 and 1965 the Moors Murderers - Ian Brady and Myra Hindley - kidnapped and murdered five children before they were caught and sentenced to life in prison. The case shook the nation and has held us both horrified and fascinated for fifty years. Three of the children - Pauline Reade, John Kilbride and Lesley Ann Downey - were discovered in shallow graves on Saddleworth Moor. Edward Evans' body was found in their spare bedroom. The body of Keith Bennett has never been found.In the late nineties Myra Hindley contributed to a documentary on the murders, made by Duncan Staff. When she died in 2002 he was sent her unpublished papers. Drawing on this unique resource, and with the cooperation of the families of the victims, the police and expert witnesses, Duncan Staff is able to cast new light on the crimes, Hindley's relationship with Brady and her life in prison. And in this new edition of his bestselling book he is able to present, for the first time, compelling new evidence about the Moors murderers' system for hiding their victims' bodies.
Blindside: (Michael Bennett 12). A missing daughter. A captive son. A secret deal. (Michael Bennett #12)
by James Patterson___________________________The mayor of New York has a daughter who's missing. Detective Michael Bennett has a son who's in prison. Can one father help the other?Bennett and the mayor have always had a tense relationship, but now the mayor sees in Bennett an exceptional investigator who might be willing to take on a case that needs to be kept under the radar. The two men strike the deal.Sources lead Bennett to a homicide in the Bronx. The victim has ties to a sophisticated hacking operation - and also to the mayor's missing daughter. But this murder is part of a serial killing spree, one with national security implications. And suddenly Bennett is at the centre of a dangerous triangle anchored by NYPD, FBI and an international crime organization.Michael Bennett has always been an honourable man, but sometimes honour has to take a back seat. Survival comes first.
Tick Tock: (Michael Bennett 4). Michael Bennett is running out of time to stop a deadly mastermind (Michael Bennett #4)
by James Patterson_______________________________TICK... A KILLER'S COUNTDOWN BEGINS.A rash of horrifying crimes tears through New York City, throwing it into complete chaos.TICK... CAN MICHAEL BENNETT CATCH HIM?The city calls on Detective Michael Bennett, pulling him away from a seaside retreat with his ten adopted children, his grandfather, and their beloved nanny, Mary Catherine. Bennett enlists the help of a former colleague, FBI Agent Emily Parker. But as his affection for Emily grows into something stronger, his relationship with Mary Catherine takes an unexpected turn.TOCK... BEFORE HIS TIME IS UP?All too soon, another appalling crime leads Bennett to a shocking discovery that exposes the killer's pattern and the earth-shattering enormity of his plan.
Run For Your Life: (Michael Bennett 2). A ruthless killer. A brilliant plan. One chance to stop him. (Michael Bennett #2)
by James Patterson__________________________A man who calls himself 'the Teacher' is devising a meticulous plan. Cold-hearted and cunning, he plans to teach New York a lesson it will never forget.Intent on exacting revenge and causing mass hysteria, he embarks on the worst killing spree the city has ever seen. The whole New York Police Department is tested to its limits; none more so than Detective Michael Bennett as the Teacher leads him on a terrifying chase that brings danger perilously close to home...
Gone: (Michael Bennett 6). Michael Bennett can run, but he can’t hide for ever (Michael Bennett #6)
by James Patterson___________________Forced into hiding from a mass murderer seeking vengeance, Detective Michael Bennett must decide whether to stay and protect his family, or hunt down the man who is hunting them.When Bennett arrested Manuel Perrine, he thought he had brought an end to the drug cartel boss’s reign of terror and would get justice for the murder of his best friend. But then, during the trial, Perrine escaped.In a bloody shoot-out, Bennett killed Perrine’s wife. Now he wants nothing more than to make Bennett suffer, to make him pay.The whole family are moved to a safe-house in California. But as Perrine’s attacks on US soil become more vicious and more daring, it’s clear there is a war coming.No one, anywhere, is safe.
The Russian: (Michael Bennett 13). The latest gripping Michael Bennett thriller (Michael Bennett #13)
by James PattersonAs Michael Bennett's wedding day approaches, a killer has a vow of his own to fulfil in the thirteenth thriller featuring the NYPD's finest detectiveWeeks before NYPD Detective Michael Bennett is to marry his long-time love, Mary Catherine, an assassin announces their presence in the city with a string of murders.All of the victims are young women, and each has been killed in a manner as precise as it was gruesome. Tasked with working alongside the FBI, Bennett uncovers multiple cold-case homicides across the country that fit the same distinctive pattern.He promises Mary Catherine that the case won't affect their upcoming wedding, but, as he struggles to connect the killings, Bennett may be walking into a deadly trap.
Ambush: (Michael Bennett 11). Ruthless killers are closing in on Michael Bennett (Michael Bennett #11)
by James Patterson_________________________________FROM THE AUTHOR OF SUNDAY TIMES NO. 1 BESTSELLER, THE PRESIDENT IS MISSINGDetective Michael Bennett's enemies know where to find him.An anonymous tip about a crime in Upper Manhattan proves to be a set-up. An officer is taken down - but despite the attackers' efforts, it's not Michael Bennett. New York's top cop is not the only one at risk.One of Bennett's children is attacked. And a series of murders follows, each with a distinct signature, alerting Bennett to the presence of a professional killer.Bennett can't tell what's driving the assassin.But he can tell it's personal._________________________________INCLUDES BONUS MICHAEL BENNETT STORY, MANHUNT
Bullseye: (Michael Bennett 9). A crucial meeting. A global crisis. One New York cop. (Michael Bennett #9)
by James Patterson________________________The President is in New York - and in an assassin's sights.As the most powerful men on earth gather in New York for a meeting of the UN, Detective Michael Bennett receives intelligence warning that there will be an assassination attempt on the US president. Even more shocking, the intelligence suggests that the Russian government could be behind the plot.Tensions between America and Russia are the highest they've been since the Cold War, but this would be an escalation no one could have expected.The details are shadowy, and Bennett finds false leads and unreliable sources at every turn. But he can’t afford to get this wrong. If the plotters succeed, the shockwaves will be felt across the globe.
Qualitative Research Methods for Business Students: A Global Approach
by Kingsley Obi Omeihe Christian HarrisonQualitative Research Methods for Business Students: A Global Approach provides a practical and accessible overview of qualitative research methods and their philosophical underpinnings. The textbook will empower you with the knowledge and skills needed to navigate the dynamic landscape of qualitative research. Key features include: Case Studies which showcase how qualitative research has been instrumental in shaping business decisions and strategies. Exercises and Activities that give you the opportunity to apply your learning. Suitable for undergraduate and postgraduate students interested in using qualitative methods in their research project or dissertation. Dr Kingsley O. Omeihe is an Associate Professor for Marketing and Small Business at the University of the West of Scotland Prof Christian Harrison is a Professor of Leadership and Enterprise at the University of Bolton.
Representation in Children′s Literature: Reflecting Realities in the classroom
by CLPEThe under-representation of characters of colour in children′s literature in the UK is quantified in the CLPE′s award winning Reflecting Realities research.Through this research, the CLPE actively disrupts the demand-and-supply chain and holds the children′s publishing industry to account, encouraging it to do better. This book: * explores what Reflecting Realities teaches us; * empowers teachers to take positive to ensure classroom libraries are truly representative; * takes time to reflect on the research; * enables teachers to explore what constitutes quality representation; * includes practical support on how to translate this thinking into positive change in the classroom; * provides guidance for curating literature for young readers; * highlights how engagement with inclusive literature positively impacts school reading cultures and wider teaching and learning.