Author: Margaret Sleeboom-Faulkner
Publisher: Routledge
ISBN: 1136202102
Category : Social Science
Languages : en
Pages : 334
Book Description
"Genomics in Asia" focuses on issues dealing with the development and application of molecular biology and bioengineering technologies in Asian societies and cultures. The workshop on which this book is based aimed to gain an insight into bioethical issues with relation to the dynamics of Asian societies, cultures and religions. It was to generate debate on Asian Genomics and create a basis for comparative research into the relationship between the development and application of modern genetics, cultural values, and local interests in Asian societies. The papers first of all reflect a great variety of bioethical views discussed from the angle of different disciplinary and cultural backgrounds, creating a basis on which a further comparison between different local knowledge systems in relation to genomic practices will be feasible. This book provides insights on research into the social, political and ethical aspects of genomics, and reflects the bioethical experiences of researchers from Japan, China, the Philippines, Thailand, Taiwan, Pakistan, India and Malaysia. The subjects of discussion vary from genetics in China to religious perspectives on cloning and genetic therapy. Themes include the commercial and medical application of new bioengineering technologies, such as the impact of preventive genetic medicine, genetic counselling, genetically modified organisms [GMOs] and stem-cell research on wealth distribution, cultural traditions, social well-being, and political and legal regulations and institutions. In the study of bioengineering in Asia, various perspectives were brought together at a concrete research level. The authors tried to avoid macro-concepts incorporated by dichotomies of East and West and to acquire new insights into the relationship between local knowledge systems and cultures and interests groups on the one hand and the constellation of various interests of scientific research, governments and MNCs on the other.
Evolutionary Genomics
Author: Maria Anisimova
Publisher: Humana Press
ISBN: 9781617795848
Category : Medical
Languages : en
Pages : 556
Book Description
Together with early theoretical work in population genetics, the debate on sources of genetic makeup initiated by proponents of the neutral theory made a solid contribution to the spectacular growth in statistical methodologies for molecular evolution. Evolutionary Genomics: Statistical and Computational Methods is intended to bring together the more recent developments in the statistical methodology and the challenges that followed as a result of rapidly improving sequencing technologies. Presented by top scientists from a variety of disciplines, the collection includes a wide spectrum of articles encompassing theoretical works and hands-on tutorials, as well as many reviews with key biological insight. Volume 2 begins with phylogenomics and continues with in-depth coverage of natural selection, recombination, and genomic innovation. The remaining chapters treat topics of more recent interest, including population genomics, -omics studies, and computational issues related to the handling of large-scale genomic data. Written in the highly successful Methods in Molecular BiologyTM series format, this work provides the kind of advice on methodology and implementation that is crucial for getting ahead in genomic data analyses. Comprehensive and cutting-edge, Evolutionary Genomics: Statistical and Computational Methods is a treasure chest of state-of the-art methods to study genomic and omics data, certain to inspire both young and experienced readers to join the interdisciplinary field of evolutionary genomics.
Publisher: Humana Press
ISBN: 9781617795848
Category : Medical
Languages : en
Pages : 556
Book Description
Together with early theoretical work in population genetics, the debate on sources of genetic makeup initiated by proponents of the neutral theory made a solid contribution to the spectacular growth in statistical methodologies for molecular evolution. Evolutionary Genomics: Statistical and Computational Methods is intended to bring together the more recent developments in the statistical methodology and the challenges that followed as a result of rapidly improving sequencing technologies. Presented by top scientists from a variety of disciplines, the collection includes a wide spectrum of articles encompassing theoretical works and hands-on tutorials, as well as many reviews with key biological insight. Volume 2 begins with phylogenomics and continues with in-depth coverage of natural selection, recombination, and genomic innovation. The remaining chapters treat topics of more recent interest, including population genomics, -omics studies, and computational issues related to the handling of large-scale genomic data. Written in the highly successful Methods in Molecular BiologyTM series format, this work provides the kind of advice on methodology and implementation that is crucial for getting ahead in genomic data analyses. Comprehensive and cutting-edge, Evolutionary Genomics: Statistical and Computational Methods is a treasure chest of state-of the-art methods to study genomic and omics data, certain to inspire both young and experienced readers to join the interdisciplinary field of evolutionary genomics.
Genomics In Asia
Author: Margaret Sleeboom-Faulkner
Publisher: Routledge
ISBN: 1136202102
Category : Social Science
Languages : en
Pages : 334
Book Description
"Genomics in Asia" focuses on issues dealing with the development and application of molecular biology and bioengineering technologies in Asian societies and cultures. The workshop on which this book is based aimed to gain an insight into bioethical issues with relation to the dynamics of Asian societies, cultures and religions. It was to generate debate on Asian Genomics and create a basis for comparative research into the relationship between the development and application of modern genetics, cultural values, and local interests in Asian societies. The papers first of all reflect a great variety of bioethical views discussed from the angle of different disciplinary and cultural backgrounds, creating a basis on which a further comparison between different local knowledge systems in relation to genomic practices will be feasible. This book provides insights on research into the social, political and ethical aspects of genomics, and reflects the bioethical experiences of researchers from Japan, China, the Philippines, Thailand, Taiwan, Pakistan, India and Malaysia. The subjects of discussion vary from genetics in China to religious perspectives on cloning and genetic therapy. Themes include the commercial and medical application of new bioengineering technologies, such as the impact of preventive genetic medicine, genetic counselling, genetically modified organisms [GMOs] and stem-cell research on wealth distribution, cultural traditions, social well-being, and political and legal regulations and institutions. In the study of bioengineering in Asia, various perspectives were brought together at a concrete research level. The authors tried to avoid macro-concepts incorporated by dichotomies of East and West and to acquire new insights into the relationship between local knowledge systems and cultures and interests groups on the one hand and the constellation of various interests of scientific research, governments and MNCs on the other.
Publisher: Routledge
ISBN: 1136202102
Category : Social Science
Languages : en
Pages : 334
Book Description
"Genomics in Asia" focuses on issues dealing with the development and application of molecular biology and bioengineering technologies in Asian societies and cultures. The workshop on which this book is based aimed to gain an insight into bioethical issues with relation to the dynamics of Asian societies, cultures and religions. It was to generate debate on Asian Genomics and create a basis for comparative research into the relationship between the development and application of modern genetics, cultural values, and local interests in Asian societies. The papers first of all reflect a great variety of bioethical views discussed from the angle of different disciplinary and cultural backgrounds, creating a basis on which a further comparison between different local knowledge systems in relation to genomic practices will be feasible. This book provides insights on research into the social, political and ethical aspects of genomics, and reflects the bioethical experiences of researchers from Japan, China, the Philippines, Thailand, Taiwan, Pakistan, India and Malaysia. The subjects of discussion vary from genetics in China to religious perspectives on cloning and genetic therapy. Themes include the commercial and medical application of new bioengineering technologies, such as the impact of preventive genetic medicine, genetic counselling, genetically modified organisms [GMOs] and stem-cell research on wealth distribution, cultural traditions, social well-being, and political and legal regulations and institutions. In the study of bioengineering in Asia, various perspectives were brought together at a concrete research level. The authors tried to avoid macro-concepts incorporated by dichotomies of East and West and to acquire new insights into the relationship between local knowledge systems and cultures and interests groups on the one hand and the constellation of various interests of scientific research, governments and MNCs on the other.
Socio-economics of Personalized Medicine in Asia
Author: Shirley Sun
Publisher: Routledge
ISBN: 1134989199
Category : Social Science
Languages : en
Pages : 139
Book Description
The second decade of the twenty-first century has witnessed a surging interest in personalized medicine with the concomitant promise to enable more precise diagnosis and treatment of disease and illness, based upon an individual’s unique genetic makeup. In this book, my goal is to contribute to a growing body of literature on personalized medicine by tracing and analyzing how this field has blossomed in Asia. In so doing, I aim to illustrate how various social and economic forces shape the co-production of science and social order in global contexts. This book shows that there are inextricable transnational linkages between developing and developed countries and also provides a theoretically guided and empirically grounded understanding of the formation and usage of particular racial and ethnic human taxonomies in local, national and transnational settings. The Open Access version of this book, available at http://www.taylorfrancis.com/doi/view/10.4324/9781315537177 has been made available under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license.
Publisher: Routledge
ISBN: 1134989199
Category : Social Science
Languages : en
Pages : 139
Book Description
The second decade of the twenty-first century has witnessed a surging interest in personalized medicine with the concomitant promise to enable more precise diagnosis and treatment of disease and illness, based upon an individual’s unique genetic makeup. In this book, my goal is to contribute to a growing body of literature on personalized medicine by tracing and analyzing how this field has blossomed in Asia. In so doing, I aim to illustrate how various social and economic forces shape the co-production of science and social order in global contexts. This book shows that there are inextricable transnational linkages between developing and developed countries and also provides a theoretically guided and empirically grounded understanding of the formation and usage of particular racial and ethnic human taxonomies in local, national and transnational settings. The Open Access version of this book, available at http://www.taylorfrancis.com/doi/view/10.4324/9781315537177 has been made available under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license.
The Peopling of East Asia
Author: Roger Blench
Publisher: Routledge
ISBN: 113435312X
Category : History
Languages : en
Pages : 356
Book Description
Recent findings in the fields of East Asian archaeology, linguistics and genetics are collected together here, making this an ideal reference tool for scholars in all disciplines working on the reconstruction of the East Asian past.
Publisher: Routledge
ISBN: 113435312X
Category : History
Languages : en
Pages : 356
Book Description
Recent findings in the fields of East Asian archaeology, linguistics and genetics are collected together here, making this an ideal reference tool for scholars in all disciplines working on the reconstruction of the East Asian past.
Who We Are and How We Got Here
Author: David Reich
Publisher: Oxford University Press
ISBN: 0192554387
Category : Science
Languages : en
Pages : 400
Book Description
The past few years have seen a revolution in our ability to map whole genome DNA from ancient humans. With the ancient DNA revolution, combined with rapid genome mapping of present human populations, has come remarkable insights into our past. This important new data has clarified and added to our knowledge from archaeology and anthropology, helped resolve long-existing controversies, challenged long-held views, and thrown up some remarkable surprises. The emerging picture is one of many waves of ancient human migrations, so that all populations existing today are mixes of ancient ones, as well as in many cases carrying a genetic component from Neanderthals, and, in some populations, Denisovans. David Reich, whose team has been at the forefront of these discoveries, explains what the genetics is telling us about ourselves and our complex and often surprising ancestry. Gone are old ideas of any kind of racial 'purity', or even deep and ancient divides between peoples. Instead, we are finding a rich variety of mixtures. Reich describes the cutting-edge findings from the past few years, and also considers the sensitivities involved in tracing ancestry, with science sometimes jostling with politics and tradition. He brings an important wider message: that we should celebrate our rich diversity, and recognize that every one of us is the result of a long history of migration and intermixing of ancient peoples, which we carry as ghosts in our DNA. What will we discover next?
Publisher: Oxford University Press
ISBN: 0192554387
Category : Science
Languages : en
Pages : 400
Book Description
The past few years have seen a revolution in our ability to map whole genome DNA from ancient humans. With the ancient DNA revolution, combined with rapid genome mapping of present human populations, has come remarkable insights into our past. This important new data has clarified and added to our knowledge from archaeology and anthropology, helped resolve long-existing controversies, challenged long-held views, and thrown up some remarkable surprises. The emerging picture is one of many waves of ancient human migrations, so that all populations existing today are mixes of ancient ones, as well as in many cases carrying a genetic component from Neanderthals, and, in some populations, Denisovans. David Reich, whose team has been at the forefront of these discoveries, explains what the genetics is telling us about ourselves and our complex and often surprising ancestry. Gone are old ideas of any kind of racial 'purity', or even deep and ancient divides between peoples. Instead, we are finding a rich variety of mixtures. Reich describes the cutting-edge findings from the past few years, and also considers the sensitivities involved in tracing ancestry, with science sometimes jostling with politics and tradition. He brings an important wider message: that we should celebrate our rich diversity, and recognize that every one of us is the result of a long history of migration and intermixing of ancient peoples, which we carry as ghosts in our DNA. What will we discover next?
Fungible Life
Author: Aihwa Ong
Publisher: Duke University Press
ISBN: 0822373645
Category : Social Science
Languages : en
Pages : 294
Book Description
In Fungible Life Aihwa Ong explores the dynamic world of cutting-edge bioscience research, offering critical insights into the complex ways Asian bioscientific worlds and cosmopolitan sciences are entangled in a tropical environment brimming with the threat of emergent diseases. At biomedical centers in Singapore and China scientists map genetic variants, disease risks, and biomarkers, mobilizing ethnicized "Asian" bodies and health data for genomic research. Their differentiation between Chinese, Indian, and Malay DNA makes fungible Singapore's ethnic-stratified databases that come to "represent" majority populations in Asia. By deploying genomic science as a public good, researchers reconfigure the relationships between objects, peoples, and spaces, thus rendering "Asia" itself as a shifting entity. In Ong's analysis, Asia emerges as a richly layered mode of entanglements, where the population's genetic pasts, anxieties and hopes, shared genetic weaknesses, and embattled genetic futures intersect. Furthermore, her illustration of the contrasting methods and goals of the Biopolis biomedical center in Singapore and BGI Genomics in China raises questions about the future direction of cosmopolitan science in Asia and beyond.
Publisher: Duke University Press
ISBN: 0822373645
Category : Social Science
Languages : en
Pages : 294
Book Description
In Fungible Life Aihwa Ong explores the dynamic world of cutting-edge bioscience research, offering critical insights into the complex ways Asian bioscientific worlds and cosmopolitan sciences are entangled in a tropical environment brimming with the threat of emergent diseases. At biomedical centers in Singapore and China scientists map genetic variants, disease risks, and biomarkers, mobilizing ethnicized "Asian" bodies and health data for genomic research. Their differentiation between Chinese, Indian, and Malay DNA makes fungible Singapore's ethnic-stratified databases that come to "represent" majority populations in Asia. By deploying genomic science as a public good, researchers reconfigure the relationships between objects, peoples, and spaces, thus rendering "Asia" itself as a shifting entity. In Ong's analysis, Asia emerges as a richly layered mode of entanglements, where the population's genetic pasts, anxieties and hopes, shared genetic weaknesses, and embattled genetic futures intersect. Furthermore, her illustration of the contrasting methods and goals of the Biopolis biomedical center in Singapore and BGI Genomics in China raises questions about the future direction of cosmopolitan science in Asia and beyond.
Genome Analysis: Current Procedures and Applications
Author: Maria S. Poptsova
Publisher: Caister Academic Press
ISBN: 9781912530205
Category : Computers
Languages : en
Pages : 398
Book Description
In recent years there have been tremendous achievements made in DNA sequencing technologies and corresponding innovations in data analysis and bioinformatics that have revolutionized the field of genome analysis.In this book, an impressive array of expert authors highlight and review current advances in genome analysis. This volume provides an invaluable, up-to-date and comprehensive overview of the methods currently employed for next-generation sequencing (NGS) data analysis, highlights their problems and limitations, demonstrates the applications and indicates the developing trends in various fields of genome research. The first part of the book is devoted to the methods and applications that arose from, or were significantly advanced by, NGS technologies: the identification of structural variation from DNA-seq data; whole-transcriptome analysis and discovery of small interfering RNAs (siRNAs) from RNA-seq data; motif finding in promoter regions, enhancer prediction and nucleosome sequence code discovery from ChiP-Seq data; identification of methylation patterns in cancer from MeDIP-seq data; transposon identification in NGS data; metagenomics and metatranscriptomics; NGS of viral communities; and causes and consequences of genome instabilities. The second part is devoted to the field of RNA biology with the last three chapters devoted to computational methods of RNA structure prediction including context-free grammar applications.An essential book for everyone involved in sequence data analysis, next-generation sequencing, high-throughput sequencing, RNA structure prediction, bioinformatics and genome analysis.
Publisher: Caister Academic Press
ISBN: 9781912530205
Category : Computers
Languages : en
Pages : 398
Book Description
In recent years there have been tremendous achievements made in DNA sequencing technologies and corresponding innovations in data analysis and bioinformatics that have revolutionized the field of genome analysis.In this book, an impressive array of expert authors highlight and review current advances in genome analysis. This volume provides an invaluable, up-to-date and comprehensive overview of the methods currently employed for next-generation sequencing (NGS) data analysis, highlights their problems and limitations, demonstrates the applications and indicates the developing trends in various fields of genome research. The first part of the book is devoted to the methods and applications that arose from, or were significantly advanced by, NGS technologies: the identification of structural variation from DNA-seq data; whole-transcriptome analysis and discovery of small interfering RNAs (siRNAs) from RNA-seq data; motif finding in promoter regions, enhancer prediction and nucleosome sequence code discovery from ChiP-Seq data; identification of methylation patterns in cancer from MeDIP-seq data; transposon identification in NGS data; metagenomics and metatranscriptomics; NGS of viral communities; and causes and consequences of genome instabilities. The second part is devoted to the field of RNA biology with the last three chapters devoted to computational methods of RNA structure prediction including context-free grammar applications.An essential book for everyone involved in sequence data analysis, next-generation sequencing, high-throughput sequencing, RNA structure prediction, bioinformatics and genome analysis.
Genomics of Cultivated Palms
Author: V Arunachalam
Publisher: Elsevier
ISBN: 0123877369
Category : Nature
Languages : en
Pages : 114
Book Description
Bioinformatics offers novel tools and resources to analyze plant genomes and genes. The complete genomes of two important commercial palms (dates and oil palm) have recently been sequenced. This offers scope for many computational tools to decipher the synteny, collinearity and common and unique genes of palms. This book reviews the latest developments in this field. Includes the latest information on the molecular breeding and bioinformatics of palms Covers past and current work and future opportunities Written in simple language avoiding technical jargon
Publisher: Elsevier
ISBN: 0123877369
Category : Nature
Languages : en
Pages : 114
Book Description
Bioinformatics offers novel tools and resources to analyze plant genomes and genes. The complete genomes of two important commercial palms (dates and oil palm) have recently been sequenced. This offers scope for many computational tools to decipher the synteny, collinearity and common and unique genes of palms. This book reviews the latest developments in this field. Includes the latest information on the molecular breeding and bioinformatics of palms Covers past and current work and future opportunities Written in simple language avoiding technical jargon
Revisiting Race in a Genomic Age
Author: Barbara A. Koenig
Publisher: Rutgers University Press
ISBN: 081354324X
Category : Science
Languages : en
Pages : 396
Book Description
Essays explore a range of topics that include drug development and the production of race-based therapeutics, the ways in which genetics could contribute to future health disparities, the social implications of ancestry mapping, and the impact of emerging race and genetics research on public policy and the media.
Publisher: Rutgers University Press
ISBN: 081354324X
Category : Science
Languages : en
Pages : 396
Book Description
Essays explore a range of topics that include drug development and the production of race-based therapeutics, the ways in which genetics could contribute to future health disparities, the social implications of ancestry mapping, and the impact of emerging race and genetics research on public policy and the media.
Applied Plant Genomics and Biotechnology
Author: Palmiro Poltronieri
Publisher: Woodhead Publishing
ISBN: 0081000715
Category : Science
Languages : en
Pages : 354
Book Description
Applied plant genomics and biotechnology reviews the recent advancements in the post-genomic era, discussing how different varieties respond to abiotic and biotic stresses, investigating epigenetic modifications and epigenetic memory through analysis of DNA methylation states, applicative uses of RNA silencing and RNA interference in plant physiology and in experimental transgenics, and plants modified to produce high-value pharmaceutical proteins. The book provides an overview of research advances in application of RNA silencing and RNA interference, through Virus-based transient gene expression systems, Virus induced gene complementation (VIGC), Virus induced gene silencing (Sir VIGS, Mr VIGS) Virus-based microRNA silencing (VbMS) and Virus-based RNA mobility assays (VRMA); RNA based vaccines and expression of virus proteins or RNA, and virus-like particles in plants, the potential of virus vaccines and therapeutics, and exploring plants as factories for useful products and pharmaceuticals are topics wholly deepened. The book reviews and discuss Plant Functional Genomic studies discussing the technologies supporting the genetic improvement of plants and the production of plant varieties more resistant to biotic and abiotic stresses. Several important crops are analysed providing a glimpse on the most up-to-date methods and topics of investigation. The book presents a review on current state of GMO, the cisgenesis-derived plants and novel plant products devoid of transgene elements, discuss their regulation and the production of desired traits such as resistance to viruses and disease also in fruit trees and wood trees with long vegetative periods. Several chapters cover aspects of plant physiology related to plant improvement: cytokinin metabolism and hormone signaling pathways are discussed in barley; PARP-domain proteins involved in Stress-Induced Morphogenetic Response, regulation of NAD signaling and ROS dependent synthesis of anthocyanins. Apple allergen isoforms and the various content in different varieties are discussed and approaches to reduce their presence. Euphorbiaceae, castor bean, cassava and Jathropa are discussed at genomic structure, their diseases and viruses, and methods of transformation. Rice genomics and agricultural traits are discussed, and biotechnology for engineering and improve rice varieties. Mango topics are presented with an overview of molecular methods for variety differentiation, and aspects of fruit improvement by traditional and biotechnology methods. Oilseed rape is presented, discussing the genetic diversity, quality traits, genetic maps, genomic selection and comparative genomics for improvement of varieties. Tomato studies are presented, with an overview on the knowledge of the regulatory networks involved in flowering, methods applied to study the tomato genome-wide DNA methylation, its regulation by small RNAs, microRNA-dependent control of transcription factors expression, the development and ripening processes in tomato, genomic studies and fruit modelling to establish fleshy fruit traits of interest; the gene reprogramming during fruit ripening, and the ethylene dependent and independent DNA methylation changes. - provides an overview on the ongoing projects and activities in the field of applied biotechnology - includes examples of different crops and applications to be exploited - reviews and discusses Plant Functional Genomic studies and the future developments in the field - explores the new technologies supporting the genetic improvement of plants
Publisher: Woodhead Publishing
ISBN: 0081000715
Category : Science
Languages : en
Pages : 354
Book Description
Applied plant genomics and biotechnology reviews the recent advancements in the post-genomic era, discussing how different varieties respond to abiotic and biotic stresses, investigating epigenetic modifications and epigenetic memory through analysis of DNA methylation states, applicative uses of RNA silencing and RNA interference in plant physiology and in experimental transgenics, and plants modified to produce high-value pharmaceutical proteins. The book provides an overview of research advances in application of RNA silencing and RNA interference, through Virus-based transient gene expression systems, Virus induced gene complementation (VIGC), Virus induced gene silencing (Sir VIGS, Mr VIGS) Virus-based microRNA silencing (VbMS) and Virus-based RNA mobility assays (VRMA); RNA based vaccines and expression of virus proteins or RNA, and virus-like particles in plants, the potential of virus vaccines and therapeutics, and exploring plants as factories for useful products and pharmaceuticals are topics wholly deepened. The book reviews and discuss Plant Functional Genomic studies discussing the technologies supporting the genetic improvement of plants and the production of plant varieties more resistant to biotic and abiotic stresses. Several important crops are analysed providing a glimpse on the most up-to-date methods and topics of investigation. The book presents a review on current state of GMO, the cisgenesis-derived plants and novel plant products devoid of transgene elements, discuss their regulation and the production of desired traits such as resistance to viruses and disease also in fruit trees and wood trees with long vegetative periods. Several chapters cover aspects of plant physiology related to plant improvement: cytokinin metabolism and hormone signaling pathways are discussed in barley; PARP-domain proteins involved in Stress-Induced Morphogenetic Response, regulation of NAD signaling and ROS dependent synthesis of anthocyanins. Apple allergen isoforms and the various content in different varieties are discussed and approaches to reduce their presence. Euphorbiaceae, castor bean, cassava and Jathropa are discussed at genomic structure, their diseases and viruses, and methods of transformation. Rice genomics and agricultural traits are discussed, and biotechnology for engineering and improve rice varieties. Mango topics are presented with an overview of molecular methods for variety differentiation, and aspects of fruit improvement by traditional and biotechnology methods. Oilseed rape is presented, discussing the genetic diversity, quality traits, genetic maps, genomic selection and comparative genomics for improvement of varieties. Tomato studies are presented, with an overview on the knowledge of the regulatory networks involved in flowering, methods applied to study the tomato genome-wide DNA methylation, its regulation by small RNAs, microRNA-dependent control of transcription factors expression, the development and ripening processes in tomato, genomic studies and fruit modelling to establish fleshy fruit traits of interest; the gene reprogramming during fruit ripening, and the ethylene dependent and independent DNA methylation changes. - provides an overview on the ongoing projects and activities in the field of applied biotechnology - includes examples of different crops and applications to be exploited - reviews and discusses Plant Functional Genomic studies and the future developments in the field - explores the new technologies supporting the genetic improvement of plants