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Natural Sciences Grade 4

by Siyavula

An open source textbook for South Africa.

Natural Sciences Grade 5

by Siyavula

An open source textbook for South Africa.

Natural Sciences Grade 6

by Siyavula

An open source textbook for South Africa.

Natural Sciences Grade 7

by Siyavula

An open source textbook for South Africa.

Natural Sciences Grade 8

by Siyavula

An open source textbook for South Africa.

Natural Sciences Grade 9

by Siyavula

An open source textbook for South Africa.

Natural Secondary Metabolites: From Nature, Through Science, to Industry

by Lillian Barros Márcio Carocho Sandrina A. Heleno

This book focuses on the different compounds (polyphenols, sterols, alkaloids terpenes) that arise from the secondary metabolism of plants and fungi and their importance for research and industry. These compounds have been the backbone and inspiration of various industries like the food, pharmaceutical and others to produce synthetic counterparts. Furthermore, many of these compounds are still widely used to carry out specific functions in all these industries. This book offers a compilation of different texts from world leading scientists in the areas of chemistry, biochemistry, plant science, biotechnology which compile information on each group of secondary metabolism compounds, and their most important applications in the food, pharmaceutical, cosmetic and textile industry. By showcasing the best uses of these compounds, the chemistry behind their production in plants and fungi, this book is a valuable resource and a "go to" artifact for various audiences. The new approach this book offers, by linking research and the application of these compounds, makes it interesting as an inspiration for new research or as a hallmark of what has been done in the secondary metabolism of plants and fungi in recent years. Although this book may be technical, it is also enjoyable as an integral reading experience due to a structured and integrated flow, from the origins of secondary metabolism in organisms, to the discovery of their effects, their high intensity research in recent years and translation into various industries. Beyond learning more on their chemistry, synthesis, metabolic pathway, readers will understand their importance to different research and industry.

Natural Security: A Darwinian Approach to a Dangerous World

by Raphael D. Sagarin Terence Taylor

The post 9/11 world has so far failed to exploit the insights of the greatest experiment in security of all time--the millions of successful defensive and offensive security strategies that abound in nature. Arms races among invertebrates, intelligence gathering by the immune system, alarm calls by marmots are but a few of nature's security strategies that have been tested and modified over billions of years. This provocative book applies lessons from nature to our own toughest security problems-from global terrorism to the rise of infectious disease to natural disasters. Written by a truly multi-disciplinary group including paleobiologists, anthropologists, psychologists, ecologists, and national security experts, it considers how models and ideas from evolutionary biology can improve national security strategies ranging from risk assessment, security analysis, and public policy to long-term strategic goals. Written with the aim of breaking down barriers between disparate disciplines in order to create more responsive and effective strategies,Natural Security provides a new lens through which to explore the ancient and ever present problem of how to maintain security in an unpredictable, complex, and dangerous world.

Natural Selection: Revisiting its Explanatory Role in Evolutionary Biology (Evolutionary Biology – New Perspectives on Its Development #3)

by Richard G. Delisle

This book contests the general view that natural selection constitutes the explanatory core of evolutionary biology. It invites the reader to consider an alternative view which favors a more complete and multidimensional interpretation. It is common to present the 1930-1960 period as characterized by the rise of the Modern Synthesis, an event structured around two main explanatory commitments: (1) Gradual evolution is explained by small genetic changes (variations) oriented by natural selection, a process leading to adaptation; (2) Evolutionary trends and speciational events are macroevolutionary phenomena that can be accounted for solely in terms of the extension of processes and mechanisms occurring at the previous microevolutionary level. On this view, natural selection holds a central explanatory role in evolutionary theory - one that presumably reaches back to Charles Darwin's Origin of Species - a view also accompanied by the belief that the field of evolutionary biology is organized around a profound divide: theories relying on strong selective factors and those appealing only to weak ones. If one reads the new analyses presented in this volume by biologists, historians and philosophers, this divide seems to be collapsing at a rapid pace, opening an era dedicated to the search for a new paradigm for the development of evolutionary biology. Contrary to popular belief, scholars' position on natural selection is not in itself a significant discriminatory factor between most evolutionists. In fact, the intellectual space is quite limited, if not non-existent, between, on the one hand, "Darwinists", who play down the central role of natural selection in evolutionary explanations, and, on the other hand, "non-Darwinists", who use it in a list of other evolutionary mechanisms. The "mechanism-centered" approach to evolutionary biology is too incomplete to fully make sense of its development. In this book the labels created under the traditional historiography - "Darwinian Revolution", "Eclipse of Darwinism", "Modern Synthesis", "Post-Synthetic Developments" - are thus re-evaluated. This book will not only appeal to researchers working in evolutionary biology, but also to historians and philosophers."

Natural Selections

by David P. Barash

"Barash . . . brilliantly integrat[es] science, literature, and pop culture into elegant and insightful commentaries on the most interesting and important questions of our time. A delightful read."--Michael Shermer, author of The Science of Good and Evil "Entertaining and thought-provoking."--Steven Pinker, author of The Blank Slate If we are, in part, a product of our genes, can free will exist? Incisive and engaging, this indispensable tour of evolutionary biology runs the gamut of contemporary debates, from science and religion to our place in the universe.

Natural Small Molecule Drugs from Plants

by Guan-Hua Du

This book discusses 120 types of natural, small-molecule drugs derived from plants. They are grouped into 7 parts according their clinical uses, such as drugs for cardiovascular diseases, for metabolic diseases, for neuropsychiatric diseases, for immune-mediated inflammatory diseases, anti-tumor drugs, and drugs for parasites and bacterial infection. Each chapter systematically summarizes one drug, including its physicochemical properties, sources, pharmacological effects and clinical applications. To help readers understand the drug better, the research and pharmacological activity for each drug is also described, which serves as a salutary lesson for future drug development. Written by frontline researchers, teachers and clinicians working in field of pharmacy and pharmacology it provides an overview of natural, small-molecule drugs derived from plants for researchers in the field.

Natural Substances for Cancer Prevention

by Jun-Ping Xu

Natural Substances for Cancer Prevention explores in detail how numerous investigations in chemical biology and molecular biology have established strong scientific evidence demonstrating how the properties of naturally occurring bioactive chemicals hamper all stages of cancers (from initiation to metastasis). Accordingly, important goals for cancer prevention are the modification of our dietary habits and an increase in the intake of more anticancer-related natural substances. More significantly, the bioactive chemicals presented in the functional foods should be readily available, inexpensive, non-toxic, and nutritional.

Natural Surfactants: Application in Enhanced Oil Recovery (SpringerBriefs in Applied Sciences and Technology)

by Neha Saxena Ajay Mandal

This book focuses on the use of natural surfactants in enhanced oil recovery, providing an overview of surfactants, their types, and different physical–chemical properties used to analyse the efficiency of surfactants. Natural surfactants discuss the history of the surfactants, their classification, and the use of surfactants in petroleum industry. Special attention has been paid to natural surfactants and their advantages over synthetic surfactants, including analysing their properties such as emulsification, interfacial tension, and wettability and how these can be used in EOR. This book offers an overview for researchers and graduate students in the fields of petroleum and chemical engineering, as well as oil and gas industry professionals.

Natural Systems

by Markus Eichhorn

Organised into four sections, this text discusses the organisation of the living world. Links Ecology, Biodiversity and Biogeography Bridges modern and conventional Ecology Builds sequentially from the concept and importance of species, through patterns of diversity to help consider global patterns of biogeography Uses real data sets to help train in essential skills

Natural UV Radiation in Enhancing Survival Value and Quality of Plants

by Swati Sen Mandi

Thisbook is the first of its kind to highlight the positive impact of natural UVradiation on plants through unique adaptations in various metabolic pathways, andprovides an evolutionary sketch of the development of molecular mechanisms forprotecting plants from solar UV ever since their migration to terrestrialhabitats. Experimental evidence is provided for establishing how plants, throughtheir stationary habit in the open field, survive and flourish by developing suitableUV acclimation strategies through the repair of damaged macromolecules and/orupregulation of screening compounds viz. flavonoids. Presenting an analysis of relatedliterature, it also highlights the importance of outdoor experiments over thosein closed chamber under artificial UV light for obtaining realistic data. The book presents a comprehensiveaccount of the stratospheric ozone layer, its formation and seasonal thinning,with particular reference to alarming anthropogenic destruction of the ozonelayer since the last quarter of the twentieth century, which has resulted in increasedUV fluence on Earth. It discusses variations in the hazardous impact of UV onlife at different latitudes through the ages, and examines altitudinal variationsin UV effects in case studies demonstrating high antioxidant content and aromastatus in Darjeeling tea leaves (at high altitudes) compared with those of the sametea clones in Assam leaves (at low altitudes), with both sites being at the samelatitude. It provides evidence which suggests that the UV effects relating tothe expression of seed vigour-viability could be epigenetic. Further, it presents recently developed microscopictechnologies for demonstrating the penetration of UV into plant cells, and discusseshow cellular metabolism can be affected either directly or via signaltransduction. Effect of damage in DNA (the key target of UV radiation) has beendemonstrated and estimated using precise techniques. The latest "FOX Hunting"technique as a useful means of transcriptome analysis that may be used fordeveloping UV tolerant plants through Marker Assisted Breeding has also beendiscussed. Using biochemical and biotechnological methods, the experimentspresented highlight the gene X environment based upregulation of specificmetabolic pathways, allowing i) value addition in plant-derived food, and ii) pavingthe way for the industrial manufacture of Alternative Medicine products. Thebook is enriched by a critical review of the available literature andappropriate case studies selected from the author's own findings, which span nearlyfour decades of active research.

Natural Wonders of the World (DK Wonders of the World)

by DK

Discover which of Earth's wonders should definitely make it onto your bucket list with this unparalleled survey of the world's natural treasures.Landscape photography combines 3D terrain models and other explanatory artworks to reveal what lies beneath the surface and how features form. To complete the all-around picture, the plants and animals that inhabit the environments are also included, making Natural Wonders of the World a celebration of our world and the most accessible-ever guide to Earth's geological processes and features.In this book about the world, you will find:-Photography of animals, nature, and sites from across the globe to create a visual celebration of our planet's natural beauty.-Artworks and digital terrain models, constructed from satellite and other data explain how features were formed and reveal their hidden sides.-Detailed chapters on different continents worldwide- including Asia, Europe, North America, and Africa. -Facts, statistics, maps, and explanations about our planet&’s plants and animals. As well as information about rainforests, glaciers, and oceans. Also, explore extreme weather conditions such as Cyclones, Thunderstorms, Tornadoes, sandstorms, and dust storms in Natural wonders of the World. This book is organized continent by continent and includes the greatest natural wonders from around the world, from the Grand Canyon to the Amazon Rainforest and the Himalayas to the Antarctic Ice-sheet! Purchase the perfect gift for those who want to tick off their bucket list locations or for those who want to learn more about the planet and the incredible wonders it has to offer.

Natural and Artificial Ball Lightning in the Earth’s Atmosphere (Springer Atmospheric Sciences)

by Vladimir L. Bychkov

The monograph is devoted to ball lightning (BL) observed in natural conditions in the air and artificial BL, long-lived luminous formations (LLF), usually obtained in laboratories experimentally. Joint consideration of artificial and natural BL emphasizes the need for a comprehensive analysis of such complex objects. It is the description of the study of the properties of artificial BL and LLF in the end of 20th and 21st centuries that allows the reader to better understand what and how can be experimentally simulated.

Natural and Artificial Photosynthesis: Solar Power as an Energy Source

by Reza Razeghifard

This technical book explores current and future applications of solar power as an unlimited source of energy that earth receives every day. Photosynthetic organisms have learned to utilize this abundant source of energy by converting it into high-energy biochemical compounds. Inspired by the efficient conversion of solar energy into an electron flow, attempts have been made to construct artificial photosynthetic systems capable of establishing a charge separation state for generating electricity or driving chemical reactions. Another important aspect of photosynthesis is the CO2 fixation and the production of high energy compounds. Photosynthesis can produce biomass using solar energy while reducing the CO2 level in air. Biomass can be converted into biofuels such as biodiesel and bioethanol. Under certain conditions, photosynthetic organisms can also produce hydrogen gas which is one of the cleanest sources of energy.

Natural and Artificial Rockslide Dams

by Reginald L. Hermanns Alexander Strom Stephen G. Evans Gabriele Scarascia-Mugnozza

In the last one hundred years, a number of catastrophic events associated with rockslide dam formation and failure have occurred in the mountain regions of the world. This book presents a global view of the formation, characteristics and behaviour of natural and artificial rockslide dams. Chapters include a comprehensive state-of-the-art review of our global understanding natural and artificial rockslide dams, overviews of approaches to rockslide dam risk mitigation, regional studies of rockslide dams in India, Nepal, China, Pakistan, New Zealand, and Argentina. Rockslide dams associated with large-scale instability of volcanoes are also examined. Detailed case histories of well-known historic and prehistoric rockslide dams provide examples of investigations of rockslide dam behaviour, stability, and characteristics. The formation and behaviour of rockslide-dammed lakes ("Quake Lakes") formed during the 2008 Wenchuan Earthquake, China are also comprehensively summarised. The formation, sedimentology and stability of rockslide dams is examined in several analytical papers. An analysis of break-out floods from volcanogenic lakes and hydrological methods of estimating break-out flood magnitude and behavior are reviewed. The use of remote sensing data in rockslide-dammed lake characterisation is explored and a new approach to the classification of rockslide dams is introduced. Finally, a unique section of the book summarises Russian and Kyrgyz experience with blast-fill dam construction in two papers by leading authorities on the technology. The volume contains 24 papers by 50 authors from 16 countries including most of the recognised world authorities on the subject.

Natural and Engineered Solutions for Drinking Water Supplies: Lessons from the Northeastern United States and Directions for Global Watershed Management

by Mark S. Ashton Emily Alcott Bradford S. Gentry

Illuminating opportunities to develop a more integrated approach to municipal water system design, Natural and Engineered Solutions for Drinking Water Supplies: Lessons from the Northeastern United States and Directions for Global Watershed Management explores critical factors in the decision-making processes for municipal water system delivery. Th

Natural and Enhanced Attenuation of Contaminants in Soils, Second Edition

by Raymond N. Yong Catherine N. Mulligan

Natural attenuation has become an effective and low-cost alternative to more expensive engineered remediation. This new edition updates the principles and fundamentals of natural attenuation of contaminants with a broader view of the field. It includes new methods for evaluating natural attenuation mechanisms and microbial activity at the lab and field scales. Case studies, actual treatments and protocols, theoretical processes, case studies, numerical models, and legal aspects in the natural attenuation of organic and inorganic contaminants are examined. Challenges and future directions for the implementation of natural attenuation and enhanced remediation techniques are also considered.

Natural and Enhanced Remediation Systems

by Suthan S. Suthersan

Building on the success of bioremediation and phytoremediation technologies, Natural and Enhanced Remediation Systems explores remediation techniques that use the beneficial effects provided by Mother Nature. Written by a leader in the industry, the book provides state-of-the-art information on natural and enhanced remediation techniques such as mo

Natural and Living Biomaterials

by Hastings

Reasons for the study of tissue materials are discussed. Specific aspects of the musculo-skeletal system are considered, the main emphasis being on bone. Structure and different mechanical properties of parying types of bone are discussed by the authors, with the concluding chapter dealing with mechanically mediated electrical properties and their relevance to bone structure and to growth or repair.

Natural and Synthetic Waxes: Origin, Production, Technology, and Applications

by Ernst J. Krendlinger Uwe H. Wolfmeier

Natural and Synthetic Waxes A compilation of all relevant information for the production and use of waxes in technical applications Waxes are among the oldest organic substances used by mankind. Before all others, beeswax is known to have played a role in human history for thousands of years. But over time, many other wax species have been detected and exploited, and prepared for different utilizations. Today, we possess knowledge of a great variety of different types of waxes. Unfortunately, there still is no broadly accepted definition of a wax: for the relatively few wax chemists, waxes are usually defined by their physico-chemical properties more than by their chemical constitution. Waxes are not uniform but oligomeric and polymeric substances, not simply describable with a chemical formula. The realm of waxes encompasses fully or partly natural, refined, partly or fully synthetic products, which can be extended by “wax-like” products which do not fulfil all definition criteria. Waxes are offered in different forms like pellets, granules, powders, or micropowders. Their number of technical applications runs into thousands. However, waxes in most cases are just adjuvants or additives, and with few exceptions like candles not known to a broader public. Only few publications over the last decades tried to present a more comprehensive overview of heir chemistry, chemical composition, their physical and analytical properties, their applications, and their sometimes astonishing history. Based on personal experience and expertise, the authors intend to present an overview on the main classes of waxes, their origin, history, future, and potential fate. Economical aspects like market size and development, ecological impacts and challenges, and regulatory issues are also addressed. Waxes are indispensable products in everyday life and in industry and technology, though mostly not even visible or distinguishable to experts. They deserve more than the role of a “poor cousin” in chemistry and technology.

Natural and Unnatural Product Chemistry: From Molecules to Systems

by Bryan Hanley

This book examines and summarises the developments and changes in the approach of organic and natural product chemists over the past years, presenting both the successes and inevitable missteps. These illustrate the process from molecular isolation and structural identification, synthesis and biosynthesis and future perspectives, including the development of biological engineering. The anticipated audience are chemistry-literate scientists who are interested both in specific aspects of natural product chemistry and the illustrative process of trial, error and success which defines the area.

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