Author: Eduardo Jacob-Lopes
Publisher: Academic Press
ISBN: 0128185376
Category : Technology & Engineering
Languages : en
Pages : 938
Book Description
The Handbook of Microalgae-based Processes and Products provides a complete overview of all aspects involved in the production and utilization of microalgae resources at commercial scale. Divided into four parts (fundamentals, microalgae-based processes, microalgae-based products, and engineering approaches applied to microalgal processes and products), the book explores the microbiology and metabolic aspects of microalgae, microalgal production systems, wastewater treatment based in microalgae, CO2 capture using microalgae, microalgae harvesting techniques, and extraction and purification of biomolecules from microalgae. It covers the largest number of microalgal products of commercial relevance, including biogas, biodiesel, bioethanol, biohydrogen, single-cell protein, single-cell oil, biofertilizers, pigments, polyunsaturated fatty acids, bioactive proteins, peptides and amino acids, bioactive polysaccharides, sterols, bioplastics, UV-screening compounds, and volatile organic compounds. Moreover, it presents and discusses the available engineering tools applied to microalgae biotechnology, such as process integration, process intensification, and techno-economic analysis applied to microalgal processes and products, microalgal biorefineries, life cycle assessment, and exergy analysis of microalgae-based processes and products. The coverage of a broad range of potential microalgae processes and products in a single volume makes this handbook an indispensable reference for engineering researchers in academia and industry in the fields of bioenergy, sustainable development, and high-value compounds from biomass, as well as graduate students exploring those areas. Engineering professionals in bio-based industries will also find valuable information here when planning or implementing the use of microalgal technologies. - Covers theoretical background information and results of recent research. - Discusses all commercially relevant microalgae-based processes and products. - Explores the main emerging engineering tools applied to microalgae processes, including techno-economic analysis, process integration, process intensification, life cycle assessment, and exergy analyses.
Handbook of Microalgae-Based Processes and Products
Author: Eduardo Jacob-Lopes
Publisher: Academic Press
ISBN: 0128185376
Category : Technology & Engineering
Languages : en
Pages : 938
Book Description
The Handbook of Microalgae-based Processes and Products provides a complete overview of all aspects involved in the production and utilization of microalgae resources at commercial scale. Divided into four parts (fundamentals, microalgae-based processes, microalgae-based products, and engineering approaches applied to microalgal processes and products), the book explores the microbiology and metabolic aspects of microalgae, microalgal production systems, wastewater treatment based in microalgae, CO2 capture using microalgae, microalgae harvesting techniques, and extraction and purification of biomolecules from microalgae. It covers the largest number of microalgal products of commercial relevance, including biogas, biodiesel, bioethanol, biohydrogen, single-cell protein, single-cell oil, biofertilizers, pigments, polyunsaturated fatty acids, bioactive proteins, peptides and amino acids, bioactive polysaccharides, sterols, bioplastics, UV-screening compounds, and volatile organic compounds. Moreover, it presents and discusses the available engineering tools applied to microalgae biotechnology, such as process integration, process intensification, and techno-economic analysis applied to microalgal processes and products, microalgal biorefineries, life cycle assessment, and exergy analysis of microalgae-based processes and products. The coverage of a broad range of potential microalgae processes and products in a single volume makes this handbook an indispensable reference for engineering researchers in academia and industry in the fields of bioenergy, sustainable development, and high-value compounds from biomass, as well as graduate students exploring those areas. Engineering professionals in bio-based industries will also find valuable information here when planning or implementing the use of microalgal technologies. - Covers theoretical background information and results of recent research. - Discusses all commercially relevant microalgae-based processes and products. - Explores the main emerging engineering tools applied to microalgae processes, including techno-economic analysis, process integration, process intensification, life cycle assessment, and exergy analyses.
Publisher: Academic Press
ISBN: 0128185376
Category : Technology & Engineering
Languages : en
Pages : 938
Book Description
The Handbook of Microalgae-based Processes and Products provides a complete overview of all aspects involved in the production and utilization of microalgae resources at commercial scale. Divided into four parts (fundamentals, microalgae-based processes, microalgae-based products, and engineering approaches applied to microalgal processes and products), the book explores the microbiology and metabolic aspects of microalgae, microalgal production systems, wastewater treatment based in microalgae, CO2 capture using microalgae, microalgae harvesting techniques, and extraction and purification of biomolecules from microalgae. It covers the largest number of microalgal products of commercial relevance, including biogas, biodiesel, bioethanol, biohydrogen, single-cell protein, single-cell oil, biofertilizers, pigments, polyunsaturated fatty acids, bioactive proteins, peptides and amino acids, bioactive polysaccharides, sterols, bioplastics, UV-screening compounds, and volatile organic compounds. Moreover, it presents and discusses the available engineering tools applied to microalgae biotechnology, such as process integration, process intensification, and techno-economic analysis applied to microalgal processes and products, microalgal biorefineries, life cycle assessment, and exergy analysis of microalgae-based processes and products. The coverage of a broad range of potential microalgae processes and products in a single volume makes this handbook an indispensable reference for engineering researchers in academia and industry in the fields of bioenergy, sustainable development, and high-value compounds from biomass, as well as graduate students exploring those areas. Engineering professionals in bio-based industries will also find valuable information here when planning or implementing the use of microalgal technologies. - Covers theoretical background information and results of recent research. - Discusses all commercially relevant microalgae-based processes and products. - Explores the main emerging engineering tools applied to microalgae processes, including techno-economic analysis, process integration, process intensification, life cycle assessment, and exergy analyses.
Microalgae-Based Biofuels and Bioproducts
Author: Raul Muñoz
Publisher: Woodhead Publishing
ISBN: 0081010273
Category : Technology & Engineering
Languages : en
Pages : 562
Book Description
Microalgae-Based Biofuels and Bioproducts: From Feedstock Cultivation to End Products compiles contributions from authors from different areas and backgrounds who explore the cultivation and utilization of microalgae biomass for sustainable fuels and chemicals. With a strong focus in emerging industrial and large scale applications, the book summarizes the new achievements in recent years in this field by critically evaluating developments in the field of algal biotechnology, whilst taking into account sustainability issues and techno-economic parameters. It includes information on microalgae cultivation, harvesting, and conversion processes for the production of liquid and gaseous biofuels, such as biogas, bioethanol, biodiesel and biohydrogen. Microalgae biorefinery and biotechnology applications, including for pharmaceuticals, its use as food and feed, and value added bioproducts are also covered. This book's comprehensive scope makes it an ideal reference for both early stage and consolidated researchers, engineers and graduate students in the algal field, especially in energy, chemical and environmental engineering, biotechnology, biology and agriculture. - Presents the most current information on the uses and untapped potential of microalgae in the production of bio-based fuels and chemicals - Critically reviews the state-of-the-art feedstock cultivation of biofuels and bioproducts mass production from microalgae, including intermediate stages, such as harvesting and extraction of specific compounds - Includes topics in economics and sustainability of large-scale microalgae cultivation and conversion technologies
Publisher: Woodhead Publishing
ISBN: 0081010273
Category : Technology & Engineering
Languages : en
Pages : 562
Book Description
Microalgae-Based Biofuels and Bioproducts: From Feedstock Cultivation to End Products compiles contributions from authors from different areas and backgrounds who explore the cultivation and utilization of microalgae biomass for sustainable fuels and chemicals. With a strong focus in emerging industrial and large scale applications, the book summarizes the new achievements in recent years in this field by critically evaluating developments in the field of algal biotechnology, whilst taking into account sustainability issues and techno-economic parameters. It includes information on microalgae cultivation, harvesting, and conversion processes for the production of liquid and gaseous biofuels, such as biogas, bioethanol, biodiesel and biohydrogen. Microalgae biorefinery and biotechnology applications, including for pharmaceuticals, its use as food and feed, and value added bioproducts are also covered. This book's comprehensive scope makes it an ideal reference for both early stage and consolidated researchers, engineers and graduate students in the algal field, especially in energy, chemical and environmental engineering, biotechnology, biology and agriculture. - Presents the most current information on the uses and untapped potential of microalgae in the production of bio-based fuels and chemicals - Critically reviews the state-of-the-art feedstock cultivation of biofuels and bioproducts mass production from microalgae, including intermediate stages, such as harvesting and extraction of specific compounds - Includes topics in economics and sustainability of large-scale microalgae cultivation and conversion technologies
Handbook of Microalgal Culture
Author: Amos Richmond
Publisher: John Wiley & Sons
ISBN: 1405172495
Category : Technology & Engineering
Languages : en
Pages : 587
Book Description
Handbook of Microalgal Culture is truly a landmarkpublication, drawing on some 50 years of worldwide experience inmicroalgal mass culture. This important book comprisescomprehensive reviews of the current available information onmicroalgal culture, written by 40 contributing authors from aroundthe globe. The book is divided into four parts, with Part I detailingbiological and environmental aspects of microalgae with referenceto microalgal biotechnology and Part II looking in depth at majortheories and techniques of mass cultivation. Part III compriseschapters on the economic applications of microalgae, includingcoverage of industrial production, the use of microalgae in humanand animal nutrition and in aquaculture, in nitrogen fixation,hydrogen and methane production, and in bioremediation of pollutedwater. Finally, Part IV looks at new frontiers and includeschapters on genetic engineering, microalgae as platforms forrecombinant proteins, bioactive chemicals, heterotrophicproduction, microalgae as gene-delivery systems for expressingmosquitocidal toxins and the enhancement of marine productivity forclimate stabilization and food security. Handbook of Microalgal Culture is an essential purchasefor all phycologists and also those researching aquatic systems,aquaculture and plant sciences. There is also much of great use toresearchers and those involved in product formulation withinpharmaceutical, nutrition and food companies. Libraries in alluniversities and research establishments teaching and researchingin chemistry, biological and pharmaceutical sciences, food sciencesand nutrition, and aquaculture will need copies of this book ontheir shelves. Amos Richmond is at the Blaustein Institute for DesertResearch, Ben-Gurion University of the Negev, Israel.
Publisher: John Wiley & Sons
ISBN: 1405172495
Category : Technology & Engineering
Languages : en
Pages : 587
Book Description
Handbook of Microalgal Culture is truly a landmarkpublication, drawing on some 50 years of worldwide experience inmicroalgal mass culture. This important book comprisescomprehensive reviews of the current available information onmicroalgal culture, written by 40 contributing authors from aroundthe globe. The book is divided into four parts, with Part I detailingbiological and environmental aspects of microalgae with referenceto microalgal biotechnology and Part II looking in depth at majortheories and techniques of mass cultivation. Part III compriseschapters on the economic applications of microalgae, includingcoverage of industrial production, the use of microalgae in humanand animal nutrition and in aquaculture, in nitrogen fixation,hydrogen and methane production, and in bioremediation of pollutedwater. Finally, Part IV looks at new frontiers and includeschapters on genetic engineering, microalgae as platforms forrecombinant proteins, bioactive chemicals, heterotrophicproduction, microalgae as gene-delivery systems for expressingmosquitocidal toxins and the enhancement of marine productivity forclimate stabilization and food security. Handbook of Microalgal Culture is an essential purchasefor all phycologists and also those researching aquatic systems,aquaculture and plant sciences. There is also much of great use toresearchers and those involved in product formulation withinpharmaceutical, nutrition and food companies. Libraries in alluniversities and research establishments teaching and researchingin chemistry, biological and pharmaceutical sciences, food sciencesand nutrition, and aquaculture will need copies of this book ontheir shelves. Amos Richmond is at the Blaustein Institute for DesertResearch, Ben-Gurion University of the Negev, Israel.
Seaweed and Microalgae as Alternative Sources of Protein
Author: Xingen Lei
Publisher:
ISBN: 9781786766212
Category : Marine algae
Languages : en
Pages : 0
Book Description
Publisher:
ISBN: 9781786766212
Category : Marine algae
Languages : en
Pages : 0
Book Description
Fuels, Chemicals and Materials from the Oceans and Aquatic Sources
Author: Francesca M. Kerton
Publisher: John Wiley & Sons
ISBN: 1119117186
Category : Science
Languages : en
Pages : 310
Book Description
Fuels, Chemicals and Materials from the Oceans and Aquatic Sources provides a holistic view of fuels, chemicals and materials from renewable sources in the oceans and other aquatic media. It presents established and recent results regarding the use of water-based biomass, both plants and animals,for value-added applications beyond food. The book begins with an introductory chapter which provides an overview of ocean and aquatic sources for the production of chemicals and materials. Subsequent chapters focus on the use of various ocean bioresources and feedstocks, including microalgae, macroalgae, and waste from aquaculture and fishing industries, including fish oils, crustacean and mollusc shells. Fuels, Chemicals and Materials from the Oceans and Aquatic Sources serves as a valuable reference for academic and industrial professionals working on the production of chemicals, materials and fuels from renewable feedstocks. It will also prove useful for researchers in the fields of green and sustainable chemistry, marine sciences and biotechnology. Topics covered include: • Production and conversion of green macroalgae • Marine macroalgal biomass as an energy feedstock • Microalgae bioproduction • Bioproduction and utilization of chitin and chitosan • Applications of mollusc shells • Crude fish oil as a potential fuel
Publisher: John Wiley & Sons
ISBN: 1119117186
Category : Science
Languages : en
Pages : 310
Book Description
Fuels, Chemicals and Materials from the Oceans and Aquatic Sources provides a holistic view of fuels, chemicals and materials from renewable sources in the oceans and other aquatic media. It presents established and recent results regarding the use of water-based biomass, both plants and animals,for value-added applications beyond food. The book begins with an introductory chapter which provides an overview of ocean and aquatic sources for the production of chemicals and materials. Subsequent chapters focus on the use of various ocean bioresources and feedstocks, including microalgae, macroalgae, and waste from aquaculture and fishing industries, including fish oils, crustacean and mollusc shells. Fuels, Chemicals and Materials from the Oceans and Aquatic Sources serves as a valuable reference for academic and industrial professionals working on the production of chemicals, materials and fuels from renewable feedstocks. It will also prove useful for researchers in the fields of green and sustainable chemistry, marine sciences and biotechnology. Topics covered include: • Production and conversion of green macroalgae • Marine macroalgal biomass as an energy feedstock • Microalgae bioproduction • Bioproduction and utilization of chitin and chitosan • Applications of mollusc shells • Crude fish oil as a potential fuel
Handbook of Algal Technologies and Phytochemicals
Author: Gokare A. Ravishankar
Publisher: CRC Press
ISBN: 0429623437
Category : Science
Languages : en
Pages : 345
Book Description
Key features: The most comprehensive resource available on the biodiversity of algal species, their industrial production processes and their use for human consumption in food, health and varied applications. Emphasis on basic and applied research, addressing aspects of scale-up for commercial exploitation for the development of novel phytochemicals (phytochemicals from algae). Addresses the underexplored and underutilized potential of chemicals from marine sources for health benefits. Each chapter, written by expert contributors from around the world, includes Summary Points, Figures and Tables, as well as up-to-date references. The first book in this two-volume set explores the diversity of algal constituents for health and disease applications. The commercial value of chemicals of value to food and health is about $6 billion annually, of which 30 percent relates to micro and macro algal metabolites and products for health food applications. This comprenhensive volume looks in detail at algal genomics and metabolomics as well as mass production of microalgae. As a whole, the two-volume set covers all micro and macro algal forms and their traditional uses; their constituents which are of value for food, feed, specialty chemicals, bioactive compounds for novel applications, and bioenergy molecules. Bio-business and the market share of algae-based products are also dealt with, providing global perspectives.
Publisher: CRC Press
ISBN: 0429623437
Category : Science
Languages : en
Pages : 345
Book Description
Key features: The most comprehensive resource available on the biodiversity of algal species, their industrial production processes and their use for human consumption in food, health and varied applications. Emphasis on basic and applied research, addressing aspects of scale-up for commercial exploitation for the development of novel phytochemicals (phytochemicals from algae). Addresses the underexplored and underutilized potential of chemicals from marine sources for health benefits. Each chapter, written by expert contributors from around the world, includes Summary Points, Figures and Tables, as well as up-to-date references. The first book in this two-volume set explores the diversity of algal constituents for health and disease applications. The commercial value of chemicals of value to food and health is about $6 billion annually, of which 30 percent relates to micro and macro algal metabolites and products for health food applications. This comprenhensive volume looks in detail at algal genomics and metabolomics as well as mass production of microalgae. As a whole, the two-volume set covers all micro and macro algal forms and their traditional uses; their constituents which are of value for food, feed, specialty chemicals, bioactive compounds for novel applications, and bioenergy molecules. Bio-business and the market share of algae-based products are also dealt with, providing global perspectives.
Handbook of Food and Feed from Microalgae
Author: Eduardo Jacob-Lopes
Publisher: Elsevier
ISBN: 0323993834
Category : Technology & Engineering
Languages : en
Pages : 676
Book Description
Handbook of Food and Feed From Microalgae: Production, Application, Regulation, and Sustainability is a comprehensive resource on all aspects of using microalgae in food and feed. This book covers applied processes, including the utilization of compounds found in microalgae, the development of food products with microalgae biomass in their composition, the use of microalgae in animal nutrition, and associated challenges and recent advances in this field. Written by global leading experts in microalgae, this book begins with the fundamentals of food and feed, including microalgal biodiversity, biogeography, and nutritional purposes. The book continues to describe compounds found within microalgae such as proteins, pigments, and antioxidants. It explains the process incorporation of microalgae into meat, dairy, beverage, and wheat products as well as real-world food applications in finfish aquaculture, mollusk, poultry, and pet feeding. The book concludes by discussing challenges and issues in the field, encompassing bioavailability, bio-accessibility, and how to address safety, regulatory, market, economics, and sustainability concerns. This book is a valuable resource for aquaculturists, food scientists, and advanced undergraduate and graduate students interested in microalgae as a sustainable food and feed ingredient. - Examines current data behind the food and feed production using microalgae-based processes - Analyzes and details the use of microalgae across industries and disciplines - Addresses and offers solutions to safety, market, sustainability, and economic issues
Publisher: Elsevier
ISBN: 0323993834
Category : Technology & Engineering
Languages : en
Pages : 676
Book Description
Handbook of Food and Feed From Microalgae: Production, Application, Regulation, and Sustainability is a comprehensive resource on all aspects of using microalgae in food and feed. This book covers applied processes, including the utilization of compounds found in microalgae, the development of food products with microalgae biomass in their composition, the use of microalgae in animal nutrition, and associated challenges and recent advances in this field. Written by global leading experts in microalgae, this book begins with the fundamentals of food and feed, including microalgal biodiversity, biogeography, and nutritional purposes. The book continues to describe compounds found within microalgae such as proteins, pigments, and antioxidants. It explains the process incorporation of microalgae into meat, dairy, beverage, and wheat products as well as real-world food applications in finfish aquaculture, mollusk, poultry, and pet feeding. The book concludes by discussing challenges and issues in the field, encompassing bioavailability, bio-accessibility, and how to address safety, regulatory, market, economics, and sustainability concerns. This book is a valuable resource for aquaculturists, food scientists, and advanced undergraduate and graduate students interested in microalgae as a sustainable food and feed ingredient. - Examines current data behind the food and feed production using microalgae-based processes - Analyzes and details the use of microalgae across industries and disciplines - Addresses and offers solutions to safety, market, sustainability, and economic issues
Recent Advances in Micro- and Macroalgal Processing
Author: Gaurav Rajauria
Publisher: John Wiley & Sons
ISBN: 1119542618
Category : Technology & Engineering
Languages : en
Pages : 64
Book Description
Recent Advances in Micro- and Macroalgal Processing A comprehensive review of algae as novel and sustainable sources of algal ingredients, their extraction and processing This comprehensive text offers an in-depth exploration of the research and issues surrounding the consumption, economics, composition, processing and health effects of algae. With contributions from an international team of experts, the book explores the application of conventional and emerging technologies for algal processing. The book includes recent developments such as drying and milling technologies along with advancements in sustainable greener techniques. The text also highlights individual groups of compounds including polysaccharides, proteins, polyphenols, carotenoids, lipids and fibres from algae. The authors provide insightful reviews of the traditional and more recent applications of algae/algal extracts in food, feed, pharmaceutical and cosmetics products. Offering a holistic view of the various applications, the book looks at the economic feasibility, market trends and considerations, and health hazards associated with algae for industrial applications. This important book: Provides a comprehensive overview of algal biomolecules and the role of emerging processing technologies Explores the potential biological and health benefits of algae and their applications in food, pharmaceuticals and cosmetic products Includes a current review of algal bioactives and processing technologies for food and ingredient manufacturers Contains contributions from leading academic and industrial experts Written for food scientists, allied researchers and professional food technologists, Recent Advances in Micro- and Macroalgal Processing: Food and Health Perspectives offers a guide to the novel processing and extraction techniques for exploring and harnessing the immense potential of algae.
Publisher: John Wiley & Sons
ISBN: 1119542618
Category : Technology & Engineering
Languages : en
Pages : 64
Book Description
Recent Advances in Micro- and Macroalgal Processing A comprehensive review of algae as novel and sustainable sources of algal ingredients, their extraction and processing This comprehensive text offers an in-depth exploration of the research and issues surrounding the consumption, economics, composition, processing and health effects of algae. With contributions from an international team of experts, the book explores the application of conventional and emerging technologies for algal processing. The book includes recent developments such as drying and milling technologies along with advancements in sustainable greener techniques. The text also highlights individual groups of compounds including polysaccharides, proteins, polyphenols, carotenoids, lipids and fibres from algae. The authors provide insightful reviews of the traditional and more recent applications of algae/algal extracts in food, feed, pharmaceutical and cosmetics products. Offering a holistic view of the various applications, the book looks at the economic feasibility, market trends and considerations, and health hazards associated with algae for industrial applications. This important book: Provides a comprehensive overview of algal biomolecules and the role of emerging processing technologies Explores the potential biological and health benefits of algae and their applications in food, pharmaceuticals and cosmetic products Includes a current review of algal bioactives and processing technologies for food and ingredient manufacturers Contains contributions from leading academic and industrial experts Written for food scientists, allied researchers and professional food technologists, Recent Advances in Micro- and Macroalgal Processing: Food and Health Perspectives offers a guide to the novel processing and extraction techniques for exploring and harnessing the immense potential of algae.
Microalgal Biotechnology
Author: Eduardo Jacob-Lopes
Publisher: BoD – Books on Demand
ISBN: 1789233321
Category : Medical
Languages : en
Pages : 226
Book Description
Microalgal Biotechnology presents an authoritative and comprehensive overview of the microalgae-based processes and products. Divided into 10 discreet chapters, the book covers topics on applied technology of microalgae. Microalgal Biotechnology provides an insight into future developments in each field and extensive bibliography. It will be an essential resource for researchers and academic and industry professionals in the microalgae biotechnology field.
Publisher: BoD – Books on Demand
ISBN: 1789233321
Category : Medical
Languages : en
Pages : 226
Book Description
Microalgal Biotechnology presents an authoritative and comprehensive overview of the microalgae-based processes and products. Divided into 10 discreet chapters, the book covers topics on applied technology of microalgae. Microalgal Biotechnology provides an insight into future developments in each field and extensive bibliography. It will be an essential resource for researchers and academic and industry professionals in the microalgae biotechnology field.
Microalgae Biotechnology for Food, Health and High Value Products
Author: Md. Asraful Alam
Publisher: Springer Nature
ISBN: 9811501696
Category : Medical
Languages : en
Pages : 479
Book Description
"Microalgae Biotechnology for Food, Health and High Value Products” presents the latest technological innovations in microalgae production, market status of algal biomass-based products, and future prospects for microalgal applications. It provides stimulating overviews from different perspectives of application that demonstrate how rapidly the commercial production of microalgae-based food, health and high value products is advancing. It also addresses a range of open questions and challenges in this field. The book highlights the latest advances of interest to those already working in the field, while providing a comprehensive overview for those readers just beginning to learn about the promise of microalgae as a sustainable source of both specialty and commercial products. It offers a valuable asset for commercial algae producers, algae product developers, scientific researchers and students who are dedicated to the advancement of microalgae biotechnology for applications in health, diet, nutrition, cosmetics, biomaterials etc.
Publisher: Springer Nature
ISBN: 9811501696
Category : Medical
Languages : en
Pages : 479
Book Description
"Microalgae Biotechnology for Food, Health and High Value Products” presents the latest technological innovations in microalgae production, market status of algal biomass-based products, and future prospects for microalgal applications. It provides stimulating overviews from different perspectives of application that demonstrate how rapidly the commercial production of microalgae-based food, health and high value products is advancing. It also addresses a range of open questions and challenges in this field. The book highlights the latest advances of interest to those already working in the field, while providing a comprehensive overview for those readers just beginning to learn about the promise of microalgae as a sustainable source of both specialty and commercial products. It offers a valuable asset for commercial algae producers, algae product developers, scientific researchers and students who are dedicated to the advancement of microalgae biotechnology for applications in health, diet, nutrition, cosmetics, biomaterials etc.