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  • General Chemistry  (77,717)
  • Humans  (26,754)
  • Gramineae
  • Leguminosae
  • Photosystem II
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  • 1
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    Assembly of the Photosystem II Membrane-Protein Complex of Oxygenic Photosynthesis (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-05
    Description: Photosystem II is a 700-kDa membrane-protein super-complex responsible for the light-driven splitting of water in oxygenic photosynthesis. The photosystem is comprised of two 350-kDa complexes each made of 20 different polypeptides and over 80 co-factors. While there have been major advances in understanding the mature structure of this photosystem many key protein factors involved in the assembly of the complex do not appear in the holoenzyme. The mechanism for assembling this super-complex is a very active area of research with newly discovered assembly factors and subcomplexes requiring characterization. Additionally the ability to split water is inseparable from light-induced photodamage that arises from radicals and reactive O2 species generated by Photosystem II chemistry. Consequently, to sustain water splitting, a “self repair” cycle has evolved whereby damaged protein is removed and replaced so as to extend the working life of the complex. Understanding how the biogenesis and repair processes are coordinated is among several important questions that remain to be answered. Other questions include: how and when are the inorganic cofactors inserted during the assembly and repair processes and how are the subcomplexes protected from photodamage during assembly? Evidence has also been obtained for Photosystem II biogenesis centers in cyanobacteria but do these also exist in plants? Do the molecular mechanisms associated with Photosystem II assembly shed fresh light on the assembly of other major energy-transducing complexes such as Photosystem I or the cytochrome b6/f complex or indeed other respiratory complexes? The contributions to this Frontiers in Plant Science Research Topic are likely to reveal new details applicable to the assembly of a range of membrane-protein complexes, including aspects of self-assembly and solar energy conversion that may be applied to artificial photosynthetic systems. In addition, a deeper understanding of Photosystem II assembly — particularly in response to changing environmental conditions — will provide new knowledge underpinning photosynthetic yields which may contribute to improved food production and long-term food security.
    Keywords: QK1-989 ; Q1-390 ; Arabidopsis thaliana ; photoactivation ; photosynthesis ; Chlamydomonas reinhardtii ; cyanobacteria ; biogenesis ; Photosystem II ; photodamage ; Nicotiana tabacum ; Synechocystis sp. PCC 6803 ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PST Botany and plant sciences
    Language: English
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  • 2
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    Advances in Plant Taxonomy and Systematics (2023)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2023-08-08
    Description: This reprint of the Special Issue "Advances in Plant Taxonomy and Systematics", includes an Editorial and fifteen high-quality papers published between April 2022 and April 2023 by global researchers. This collection addresses scholars and students interested in current progresses in taxonomy and systematics, which are crucial for all plant applications.
    Keywords: alpine species ; chromosome number ; Irano-Turanian region ; biogeography ; rapid radiation ; Veronica ; endemism ; morphometrics ; image analysis ; molecular analysis ; niche similarity ; nomenclature ; Magnoliaceae ; chloroplast genome ; phylogenomics ; intergeneric relationship ; Crassula ; Crassulaceae ; plastome ; codon usage ; codon aversion ; DNA barcoding ; evolutionary rates ; phylogeny ; Adonanthe ; molecular phylogeny ; taxonomy ; steppic plant ; demographic systematics ; ethology ; evolution ; natural selection ; next-generation sequencing ; ordination ; reproductive isolation ; sexual deceit ; speciation ; species circumscription ; Astragalus subgenus Hypoglottis ; Leguminosae ; Iran ; rapid diversification ; section Hypoglottidei ; section Stereothrix ; Australia ; carnivorous plants ; non-core Caryophyllales ; Nepenthales ; sundews ; typification ; Adelieae ; Argythamnia ; Caperonia ; Caperonieae ; Chiropetalum ; Ditaxeae ; Ditaxis ; phylogenetics ; Philyra ; Arecaceae ; Bentinckia ; biogeographic analysis ; karyomorphology ; Asteraceae ; ecology ; ddRADseq ; geography ; leaf morphology ; polyploidy ; chromosome numbers ; Crocus heuffelianus group ; Crocus series Verni ; dysploidy ; genome size ; genotyping-by-sequencing (GBS) ; morphometry ; apomixis ; hybridisation ; multiple origins ; Sorbus austriaca ; genomics ; geometric morphometrics ; Ranunculus auricomus ; taxonomically complex groups (TCGs) ; arid lands ; Cactaceae ; colonization ; Mammillaria ; Mexican Plateau ; Miocene ; Pleistocene ; recent diversification ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PST Botany & plant sciences
    Language: English
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  • 3
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    How nature shaped echolocation in animals (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-03-31
    Description: Echolocation has evolved in different groups of animals, from bats and cetaceans to birds and humans, and enables localization and tracking of objects in a dynamic environment, where light levels may be very low or absent. Nature has shaped echolocation, an active sense that engages audiomotor feedback systems, which operates in diverse environments and situations. Echolocation production and perception vary across species, and signals are often adapted to the environment and task. In the last several decades, researchers have been studying the echolocation behavior of animals, both in the air and underwater, using different methodologies and perspectives. The result of these studies has led to rich knowledge on sound production mechanisms, directionality of the sound beam, signal design, echo reception and perception. Active control over echolocation signal production and the mechanisms for echo processing ultimately provide animals with an echoic scene or image of their surroundings. Sonar signal features directly influence the information available for the echolocating animal to perceive images of its environment. In many echolocating animals, the information processed through echoes elicits a reaction in motor systems, including adjustments in subsequent echolocation signals. We are interested in understanding how echolocating animals deal with different environments (e.g. clutter, light levels), tasks, distance to targets or objects, different prey types or other food sources, presence of conspecifics or certain predators, ambient and anthropogenic noise. In recent years, some researchers have presented new data on the origins of echolocation, which can provide a hint of its evolution. Theoreticians have addressed several issues that bear on echolocation systems, such as frequency or time resolution, target localization and beam-forming mechanisms. In this Research Topic we compiled recent work that elucidates how echolocation – from sound production, through echolocation signals to perception- has been shaped by nature functioning in different environments and situations. We strongly encouraged comparative approaches that would deepen our understanding of the processes comprising this active sense.
    Keywords: QP1-981 ; Q1-390 ; bats ; Biosonar ; Humans ; marine mammals ; sensory biology ; Birds ; Behavior ; Communication ; thema EDItEUR::M Medicine and Nursing::MF Pre-clinical medicine: basic sciences::MFG Physiology
    Language: English
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  • 4
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    Chocolate and Health: Friend or Foe? (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-03-30
    Description: In the ancient past, cocoa has been appreciated as a high-calorie food to boost energy in soldiers and for its undefined medicinal and mystical properties. During other times, chocolate has been considered as the forbidden “food of God”: a treasure of pleasure for the mind and the soul. The overall perception of the consumer for chocolate was of a “charming” and appealing food with lots of negative aspects related to high sugar content leading to consider chocolate as “junk food” for its “obesigen” calories. Recently, in association with the renewed interest of nutrition science in alternative source of health-promoting foods and ingredients, a large body of research has been conducted to unravel the pro and cons of cocoa in relation to human health. Epidemiological evidences indicate that cocoa consumption helps preventing cardiovascular disease for its high content in bioactive flavonoids. Clinical trials show that chocolate consumption might improve vascular function, decreasing platelet aggregation and display an antioxidant and anti-inflammatory effect. The putative protective action of cocoa seems to be multi-factorial and involving different aspects of vascular, antioxidant and endothelial function. However, the mechanism(s) that account for the benefits of cocoa it is still unclear. The aim of this Research Topic is therefore to provide the reader with an objective picture of the state of art on the association between cocoa and health, mainly through the evidences of human trials; overwhelmingly considered the golden standard for nutritional science. The Research Topic will cover the analysis of the manufacturing processes of the chocolate and the antioxidant effects in humans as well as the majority of the putative health effects of chocolate and cocoa, such as anti-inflammatory properties, effect on immunity, platelet aggregation, blood pressure, endothelial function and cognitive behavior. Unraveling the functional properties of cocoa will help to understand if the 'food of God' is a primordial gift for the health of mankind.
    Keywords: R5-920 ; RC581-607 ; TX341-641 ; Antioxidants ; Obesity ; Flavonoids ; Humans ; Chocolate ; Blood pressure ; Inflammation ; Cognitive function ; Cocoa ; Immunity
    Language: English
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  • 5
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    The Functional Organization of the Auditory System (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-05
    Description: This eBook comprises s series of original research and review articles dealing with the anatomical, genetic, and physiological organization of the auditory system from humans to monkeys and mice.
    Keywords: RC321-571 ; Q1-390 ; audition ; monkeys ; gens ; translational ; Humans ; Rodents ; Memory ; Perception ; Physiology ; functional imaging ; Anatomy ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
    Language: English
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  • 6
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    Phototrophic Bacteria (2022)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2022-11-17
    Description: Microorganisms is pleased to publish this book, which reprints papers that appeared in a Special Issue on “Phototrophic Bacteria”, with Guest Editors Robert Blankenship and Matthew Sattley. This Special Issue included research on all types of phototrophic bacteria, including both anoxygenic and oxygenic forms. Research on these bacterial organisms has greatly advanced our understanding of the basic principles that underlie the energy storage that takes place in all types of photosynthetic organisms, including both bacterial and eukaryotic forms. Topics of interest include: microbial physiology, microbial ecology, microbial genetics, evolutionary microbiology, systems microbiology, agricultural microbiology, microbial biotechnology, and environmental microbiology, as all are related to phototrophic bacteria.
    Keywords: aerobic anoxygenic phototrophic bacteria ; chlorophototroph ; thermophile ; hot spring ; bacteriochlorophyll ; Alphaproteobacteria ; cyanophage ; Nostoc sp. ; label-free quantitative proteomics ; photosynthesis ; substance metabolism ; energy metabolism ; purple sulfur bacteria ; genomic phylogeny ; Ectothiorhodospiraceae ; Halorhodospiraceae ; new family and genus ; scytonemin ; ultraviolet radiation ; high light ; cyanobacteria ; Acaryochloris ; chlorophyll ; genomics ; far-red photosynthesis ; plasmid ; horizontal gene transfer ; Rhodocyclus ; purpureus ; tenuis ; gracilis ; HiPIP ; cobalamin ; whole genome sequencing ; taxonomy ; chlorophyll d ; Moss Beach ; photosynthetic pigments ; absorbance spectra ; genome sequence ; Photosystem II ; oxygenic photosynthesis ; photosynthetic reaction center ; cryo-electron microscopy ; cyclic electron flow ; ferredoxin-NADP reductase ; NDH-1 ; proton motive force ; thylakoid ; anoxygenic phototrophs ; heliobacteria ; bacteriochlorophyll g ; Heliophilum fasciatum ; Heliobacteria ; promoters ; reporters ; gene expression ; phototrophic bacteria ; transcriptional regulation ; gene transfer ; persulfide ; redox signaling ; cyclic GMP ; PpsR ortholog ; AerR photoreceptor ; light regulation ; photosynthesis gene regulators ; two-component system ; RegA ; aerobic ; copper ion ; disulfide bond ; DNA binding ; gene regulation ; purple phototrophic bacteria ; extremophile ; Halorhodospira halochloris ; Halorhodospira abdelmalekii ; light-harvesting 1 reaction center ; bacteriochlorophyll b ; thermal stability ; salt- and pH-dependence ; near infrared ; stromatolite ; shark bay ; reduction-oxidation ; photosystem II ; phycobilisome ; RNase ; light-harvesting ; aerobic anoxygenic phototrophs ; AAP ; Rhodobacter ; purple nonsulfur bacteria ; Yellowstone ; xanthorhodopsin ; vitamin B12 ; frameshifting ; evolution ; chelatase ; chlIDH ; cobNST ; phototrophic extracellular electron uptake ; comparative genomics ; transcriptomics ; Rhodovulum sulfidophilum ; Rhodovulum visakhapatnamense ; ancestral sequence reconstruction ; chlorophyll f ; far-red light photoacclimation ; Synechococcus sp. PCC 7335 ; Chloroflexus aurantiacus ; proteomic analysis ; respiration ; chlorosome ; alternative complex III ; phylogenomic and comparative genomic analyses ; conserved signature indels (CSIs) ; molecular signatures ; class Chlorobia and the families Chlorobiaceae and Chloroherpetonaceae ; Ignavibacteria ; uncultured species/strains related to Chlorobia/Ignavibacteria ; FNR ; NDH ; photoheterotrophic growth ; comparative genome analysis ; cyanobacterial photoreceptors ; phycobiliproteins ; chromatic acclimation ; linker proteins ; phylogenetic comparison ; halophiles ; alkaliphiles ; nitrogen fixation ; diazotroph ; Rhodovulum tesquicola ; hydrogen ; electron transport ; photosystem I ; microbial ecology of lakes ; bacterial community ; Lake Winnipeg ; food web dynamics ; picoplankton ; bacterioplankton ; carotenoid ; Synechocystis ; zeta-carotene isomerase (Z-ISO) ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSG Microbiology (non-medical)
    Language: English
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  • 7
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    Spatial memory - a unique window into healthy and pathological ageing (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-05
    Description: The global population aged over 60 is set to rise dramatically in the coming decades. In many countries, the older population now faces the prospect of spending a quarter of their lives aged over 65, and a significant proportion will have to cope with cognitive decline associated with normal ageing or with dementia disorders. Given that these fundamental demographic changes will pose a significant challenge to health care systems, a detailed understanding of age-related cognitive and neurobiological changes is essential in helping elderly populations maintain cognitive performance. In addition, developing sensitive biomarkers to identify those at risk of developing dementia is crucial for early and effective interventions. To make inferences about the ageing process from the animal model back to the human, rigorous behavioral paradigms must be used to ensure that the same function is being examined across species. Given that similar navigational paradigms can easily be applied to humans and animals, recent years have seen an expansion of studies attempting to bridge the gap between age-related changes in animal and human spatial cognition. These studies begin to suggest that disruptions in spatial computations are among the earliest indicators of impending cognitive decline. In addition, although many animal studies have identified pathological mechanisms with paradigms involving spatial navigation, these mechanisms support many nonspatial cognitive functions as well. As a consequence, a successful characterization of how spatial processing changes in the ageing brain could reveal fundamental effects of cognitive ageing that could inform about general mechanisms underlying decline in perception, mnemonic processing and multisensory integration.
    Keywords: RC321-571 ; Q1-390 ; Neuroscience ; spatial navigation ; Humans ; Aging ; Animal Models ; Dementia ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
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  • 8
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    Hidden Depths (2022)
    White Rose University Press | White Rose University Press
    Details
    Publication Date: 2022-12-06
    Description: In Hidden Depths, Professor Penny Spikins explores how our emotional connections have shaped human ancestry. Focusing on three key transitions in human origins, Professor Spikins explains how the emotional capacities of our early ancestors evolved in response to ecological changes, much like similar changes in other social mammals. For each transition, dedicated chapters examine evolutionary pressures, responses in changes in human emotional capacities and the archaeological evidence for human social behaviours. Starting from our earliest origins, in Part One, Professor Spikins explores how after two million years ago, movement of human ancestors into a new ecological niche drove new types of collaboration, including care for vulnerable members of the group. Emotional adaptations lead to cognitive changes, as new connections based on compassion, generosity, trust and inclusion also changed our relationship to material things. Part Two explores a later key transition in human emotional capacities occurring after 300,000 years ago. At this time changes in social tolerance allowed ancestors of our own species to further reach out beyond their local group and care about distant allies, making human communities resilient to environmental changes. An increasingly close relationship to animals, and even to cherished possessions, appeared at this time, and can be explained through new human vulnerabilities and ways of seeking comfort and belonging. Lastly, Part Three focuses on the contrasts in emotional dispositions arising between ourselves and our close cousins, the Neanderthals. Neanderthals are revealed as equally caring yet emotionally different humans, who might, if things had been different, have been in our place today. This new narrative breaks away from traditional views of human evolution as exceptional or as a linear progression towards a more perfect form. Instead, our evolutionary history is situated within similar processes occurring in other mammals, and explained as one in which emotions, rather than ‘intellect’, were key to our evolutionary journey. Moreover, changes in emotional capacities and dispositions are seen as part of differing pathways each bringing strengths, weaknesses and compromises. These hidden depths provide an explanation for many of the emotional sensitivities and vulnerabilities which continue to influence our world today.
    Keywords: Human demography ; Group size ; Lithic transfers ; Raw material movements ; Bonobos ; Dog burial ; Comfort ; Symbolic objects ; Symbolism ; Mobiliary art ; Attachment fluidity ; Hypersociability ; Human-animal relationships ; Dog domestication ; Attachment object ; Approachability ; Approach behaviour ; Avoidance behaviour ; Androgens ; Physiological responses ; Cognitive Archaeology ; Autism Spectrum Condition ; Handaxe ; Biface ; Neurodiversity ; Palaeolithic stone tools ; Evolution of neurodiversity ; Rock art ; Ice age art ; Material Culture ; Cultural transmission ; Emotional commitment ; Biopsychosocial approach ; Social tolerance ; Attachment ; Genus Homo ; Acheulian ; Cultural evolution ; Skeletal abnormality ; Injury ; Illness ; Interdependence ; Emotional sensitivity ; Moral emotions ; Evolution of Altruism ; Hominins ; Upper Palaeolithic ; Lower Palaeolithic ; Ecological niche ; Selective pressure ; Behavioural ecology ; Wolves ; Affective empathy ; Cognitive empathy ; Theory of mind ; Human Cognition ; Vulnerability ; Evolutionary Psychology ; Developmental psychology ; Helping behaviours ; Social cognition ; Social mammals ; Human Emotion ; Human social collaboration ; Generosity ; Emotional brain ; Social emotions ; Comparative behaviour ; Evolution ; Social carnivores ; Primate behavioural ecology ; Primate social systems ; Human Evolution ; Human ancestors ; Collaboration ; Evolutionary Biology ; Emotional vulnerability ; Social connection ; Decolonisation ; Social networks ; Middle Palaeolithic ; Community resilience ; Convergent evolution ; Chimpanzee ; Origin of modern humans ; Social safeness ; Wolf domestication ; Cherished possessions ; Compensatory attachment ; Loneliness ; Palaeolithic art ; Stress reactivity ; Bonding hormones ; Humans ; Hunter-gatherers ; Intergroup collaboration ; Tolerance ; Emotional connection ; Autism ; Trust ; Early Prehistory ; Palaeopathology ; Origins of healthcare ; Human self-domestication ; Palaeolithic Archaeology ; Social brain ; Care-giving ; Empathy ; Neanderthals ; Compassion ; Social Connection ; Evolution of Emotions ; Human Origins ; Adaptation ; Prehistory ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHM Anthropology ; bic Book Industry Communication::H Humanities::HD Archaeology ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSA Life sciences: general issues::PSAF Ecological science, the Biosphere ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSA Life sciences: general issues::PSAJ Evolution ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPW Political activism::JPWQ Revolutionary groups & movements ; bic Book Industry Communication::J Society & social sciences::JM Psychology
    Language: English
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  • 9
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    Neuropharmacological, Neurobiological and Behavioral Mechanisms of Learning and Memory (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-04
    Description: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact
    Keywords: drugs ; Behavior ; Memory tasks ; pre-clinical ; clinical ; Humans ; Animals ; thema EDItEUR::P Mathematics and Science::PD Science: general issues ; thema EDItEUR::M Medicine and Nursing::MK Medical specialties, branches of medicine::MKG Pharmacology
    Language: English
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  • 10
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    Pacific Climate Cultures (2022)
    De Gruyter | De Gruyter Open Poland
    Details
    Publication Date: 2022-11-22
    Description: This edited volume examines the opportunities to think, do, and/or create jointly afforded by digital storytelling. The contributors discuss digital storytelling in the context of educational programs, teaching anthropology, and ethnographic research involving a variety of populations and subjects that will appeal to researchers and practitioners engaged with qualitative methods and pedagogies that rely on media technology.
    Keywords: Discourse ; Climate Change ; Humans ; Nature ; Oceania ; Resilience ; Environmental Ethics ; Environmental Change ; Worldview ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFF Social issues & processes::JFFC Social impact of disasters ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFH Popular beliefs & controversial knowledge::JFHF Folklore, myths & legends ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFS Social groups::JFSL Ethnic studies::JFSL9 Indigenous peoples ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHB Sociology::JHBD Population & demography ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHM Anthropology ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSX Human biology::PSXM Medical anthropology
    Language: English
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