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  • 11
    Keywords: Forest management. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (268 pages)
    Edition: 1st ed.
    ISBN: 9780128096895
    DDC: 333.9539
    Language: English
    Note: Cover -- Title Page -- Copyright Page -- Contents -- List of Contributors -- Preface -- Executive Summary -- Introduction -- Aim -- Analysis -- Comparison of Forest Biomass Supply Chains from the Boreal and Temperate Biomes -- Quantifying Forest Biomass Mobilisation Potential in the Boreal and Temperate Biomes -- Environmental Sustainability Aspects of Forest Biomass Mobilisation -- Challenges and Opportunities of Logistics and Economics of Forest Biomass Mobilisation -- Economic and Social Aspects of Forest Biomass Mobilisation -- Challenges and Opportunities for the Conversion Technologies Used to Make Forest Biomass-Based Bioenergy and Biofuels -- Challenges and Opportunities of International Trade of Forest Biomass -- Constraints and Success Factors for Woody Biomass Energy Systems in Two Countries with Minimal Moody Biomass Energy Sectors -- Summary of opportunities -- Technological and Institutional Learning -- Trade -- Organisation Structures -- Improvement of Supply Chain Data Reporting -- Integration of Energy and Forest Systems -- Management of Biomass Quality -- Integrated Planning of Bioenergy and Conventional Wood Products -- Conversion Efficiency and Cascading Use -- Integrated Forest Land Planning for Energy, Conventional Wood Products and Ecosystem Services -- Development of a Shared Vision -- Recognition of Different Views and Understandings -- Development of Common Sustainability Criteria -- Development of Common Technical Standards -- Conclusions -- Chapter 1 - Introduction -- Highlights -- Introduction -- General aim of the book -- References -- Chapter 2 - Comparison of Forest Biomass Supply Chains From the Boreal and Temperate Biomes -- Highlights -- Introduction -- Supply -- Demand -- Country profiles -- Geographical and Socio-Economic Characteristics -- Energy Profile -- Forest Sector -- Supply chain description. , Australia -- Belgium -- Canada -- Croatia -- Denmark -- Finland -- Germany -- Ireland -- New Zealand -- Norway -- Sweden -- United States -- Summary and conclusions -- References -- Chapter 3 - Quantifying Forest Biomass Mobilisation Potential in the Boreal and Temperate Biomes -- Highlights -- Introduction -- Methodology -- Roundwood-to-NPP Ratio -- Forest NPP -- Roundwood Production -- Bioenergy-to-Roundwood Ratio -- Forest Bioenergy Production -- Analysis -- Summary and conclusions -- References -- Chapter 4 - Environmental Sustainability Aspects of Forest Biomass Mobilisation -- Highlights -- Introduction -- Background -- Analysis -- Land-Use Change -- Implications of Forest Biomass Removal From Existing Forest Areas -- Soil and Site Productivity -- Surface and Ground Waters -- Biodiversity -- Carbon and Climate Change -- Summary and conclusions -- References -- Chapter 5 - Challenges and Opportunities of Logistics and Economics of Forest Biomass -- Highlights -- Introduction -- Matching supply to demand -- Spatial and Temporal Challenges of Feedstock Supply -- Chipping of Forest Biomass -- Management of the Harvesting, Chipping and Transport Processes -- Predicting and Managing Fuel Quality -- Economics and overall quality of supply -- Economic Sustainability of Feedstock Supply -- Overall Quality and Trust in the Supply Chain -- Summary and conclusions -- References -- Chapter 6 - Economic and Social Barriers Affecting Forest Bioenergy Mobilisation: A Review of the Literature -- Introduction -- Impact classification and methodological approaches -- Economic Versus Social Impacts -- Economic -- Social -- Methodological Approaches -- Review of results -- Economic Impacts -- Social Impacts -- Barriers to bioenergy market development -- Summary and conclusions -- References. , Chapter 7 - Challenges and Opportunities for the Conversion Technologies Used to Make Forest Bioenergy -- Highlights -- Introduction -- Forest biomass feedstocks and conversion technologies -- Biomass Upgrading -- Pelletisation -- Pyrolysis -- Gasification -- Biochemical Conversion -- Biomass Applications and Conversion Technologies -- Forest Biomass in the Energy Sector -- Bioenergy Conversion Technologies for Forest Biomass -- Biomass for Heat Generation -- Domestic Heating and Cooking -- District Heating and Cooling -- Industrial Heating -- Biomass for Power and CHP Generation -- Biomass-Based Power Plants -- Co-Firing -- Biomass-Based Co-Generation -- Major biomass-to-energy users -- Finland -- Sweden -- The United States -- Canada -- Challenges and opportunities for forest biomass based energy conversion technologies -- Technological Challenges -- Market Challenges -- Policy Challenges -- Opportunities for Forest Biomass-Based Energy and Conversion Technologies -- Improvement in Conversion Efficiency -- Rural Development -- Emissions Reduction and Enhanced Energy Security -- Summary and conclusions -- References -- Chapter 8 - Challenges and Opportunities for International Trade in Forest Biomass -- Highlights -- Introduction -- Demand markets -- European Union -- Belgium -- Denmark -- The Netherlands -- Sweden -- The United Kingdom -- Asia -- North America -- Global Demand by 2020 -- Supply regions -- Key Regions of Woody Biomass Production up to 2013 -- Key Regions of Woody Biomass Production by 2020 -- Sustainability requirements and certification status -- Sustainability and Certification Requirements in Key Industrial Demand Markets in the EU -- The United Kingdom -- Belgium -- The Netherlands -- Denmark -- Supply-side Certification Status and Volume Estimates -- Canada -- The United States -- Russia. , Discussion: supply limitations and potential trade barriers -- Summary and conclusions -- References -- Chapter 9 - Constraints and Success Factors for Woody Biomass Energy Systems in Two Countries with Minimal Bioenergy Sectors -- Highlights -- Introduction -- Analysis -- Comparing Austria, Finland, Germany and Sweden with Australia and Canada -- National Forest Sectors -- Energy Sectors -- Government Support -- Socio-Political Factors -- Local Expertise -- Successful Niche Applications of Bioenergy Systems in Canada and Australia -- Challenges and Opportunities of Niche Applications in Countries Without Broadly Successful Woody Biomass Energy Sectors -- Summary and conclusions -- References -- Chapter 10 - Challenges and Opportunities for the Mobilisation of Forest Bioenergy in the Boreal and Temperate Biomes -- Highlights -- Introduction -- Challenges -- Variability of Supply Chains -- Policy -- Logistics -- Trade -- Environmental and Social Sustainability -- Opportunities and solutions -- Technological and Institutional Learning -- Trade -- Organisation Structures -- Improvement of Supply Chain Data Reporting -- Integration of Energy and Forest Systems -- Management of Biomass Quality -- Integrated Planning of Bioenergy and Conventional Wood Products -- Conversion Efficiency and Cascading Use -- Integrated Forest Land Planning for Energy, Conventional Wood Products and Ecosystem Services -- Development of a Shared Vision -- Recognition of Different Views and Understandings -- Development of Common Sustainability Criteria -- Development of Common Technical Standards -- Mobilisation of forest bioenergy potential -- Summary and conclusions -- References -- Abbreviations -- Unit Conversion -- Author Index -- Subject Index -- Back cover.
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  • 12
    Keywords: Ultrasonic waves -- Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (431 pages)
    Edition: 1st ed.
    ISBN: 9781483148595
    Language: English
    Note: Front Cover -- Internal Friction and Ultrasonic Attenuation in Solids -- Copyright Page -- Table of Contents -- Preface -- Part 1: Dislocation Damping 1 -- Chapter 1. Dislocation Relaxation Peaks -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- THE BORDONI PEAK -- OTHER PEAKS IN FCC METALS -- PEAKS IN BCC AND HEXAGONAL METALS -- REFERENCES -- Chapter 2. The Bordoni Peak in Copper Single Crystals at Kilohertz Frequencies -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- RESULTS -- DISCUSSION -- REFERENCES -- Chapter 3. Evidence of Peierls Nabarro Stress by Microdeformation and Attenuation Experiments -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL RESULTS -- DISCUSSION -- ACKNOWLEDGMENT -- REFERENCES -- Chapter 4. Dislocation Internal Friction Peaks in Body-Centred Cubic Metals -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- ON THE Y RELATION IN TANTALUM -- THE α AND δ RELAXATION IN NIOBIUM -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter 5. The α-Maximum in Ta Investigated in the 1Hz-Frequency Range1 -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL PROCEDURE -- EXPERIMENTAL RESULTS -- DISCUSSION -- REFERENCES -- ACKNOWLEDGEMENT. -- Chapter 6. Study for Observation Conditions for α and γ Relaxation in Niobium -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL PROCEDURE -- EXPERIMENTAL RESULTS -- DISCUSSION -- CONCLUSION -- REFERENCES -- Chapter 7. Oscillation Amplitude Dependence of Internal Friction Peaks α, γ, ßα and ßγ in Iron -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL TECHNIQUES -- EXPERIMENTAL RESULTS -- DISCUSSION -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter 8. The a and ß1 Peaks in Deformed and/or Irradiated Pure Iron -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL TECHNIQUES -- EXPERIMENTAL RESULTS -- DISCUSSION -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES. , Chapter 9. Dislocation Relaxation Peaks in Pure and Doped Iron -- ABSTRACT -- INTRODUCTION -- EXPERIMENTAL PROCEDURE -- EXPERIMENTAL RESULTS -- DISCUSSION -- REFERENCES -- Chapter 10. An Analysis of the α Peak in Niobium and Vanadium by Means of the Schoeck Theory -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- DISCUSSION -- REFERENCES -- Chapter 11. Study of Dislocation Mobility by Coupling of Low and High Frequency Applied Stresses -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL RESULTS -- CONCLUSION -- REFERENCES -- Chapter 12. Effects of Cyclic Deformation and Irradiation at Low Temperature on the Internal Friction of Pure Aluminium -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- MODEL -- DISCUSSION -- IRRADIATIONS -- REFERENCES -- Chapter 13. Modulus Effect and Internal Friction in Cold Worked Copper and Some Copper Based Solid Solutions -- EXPERIMENTAL METHOD AND RESULTS -- CONCLUSIONS -- REFERENCES -- Chapter 14. Influence of the Sample Pre-Treatment upon the Cold-Work Effects of Internal Friction in Copper -- ABSTRACT -- INTRODUCTION -- EXPERIMENTAL TECHNIQUE -- EXPERIMENTAL RESULTS -- DISCUSSION -- REFERENCES -- Chapter 15. Internal Friction of High Purity Magnesium after Plastic Deformation -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL RESULTS -- AKNOWLEDGMENTS -- REFERENCES -- Chapter 16. Internal Friction in Zr after Deformation -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL PROCEDURE -- DISCUSSION -- REFERENCES -- ACKNOWLEDGEMENT -- Chapter 17. Characterization of the Peaking Effect in Copper and Silver -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL TECHNIQUES -- EXPERIMENTAL RESULTS -- DISCUSSION -- REFERENCES -- Chapter 18. A New Damping Model for the "Peaking Effect -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- SYNTHESIS OF EXPERIMENTAL RESULTS -- MODEL -- CONCLUSION -- REFERENCES. , Chapter 19. Interpretation of the 'Peaking Effect' -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- QUALITATIVE DESCRIPTION OF THE MODEL -- RATE-EQUATION TREATMENT OF THE PINNING-UNPINNING KINETICS -- PREDICTION OF A PEAKING EFFECT WITHIN THE VIBRATING-STRING APPROXIMATION -- DISCUSSION AND COMPARISON WITH EXPERIMENTS -- ACKNOWLEDGMENT -- REFERENCES -- Chapter 20. A Model of the Internal Friction Observedin Crystalline Solids in the Pre-Plastic Region at Low Frequencies -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- THE MODEL -- BOLTZMANN SUPERPOSITION -- DISCUSSION AND CONCLUSIONS -- REFERENCES -- Part 2: Zener Relaxation -- Chapter 21. The Zener Relaxation: A Convenient Tool to Study Vacancy Sources and Sinks in a Metal Lattice -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- DESCRIPTION OF EQUILIBRATION KINETICS -- GENERAL CONSIDERATIONS ON ZENER RELAXATION METHODS -- RESISTOMETRIC AND ANELASTIC APPROACHES : A COMPARATIVE ANALYSIS -- ANELASTIC STUDIES IN AgZn SOLID SOLUTIONS -- REFERENCES -- Chapter 22. The Production Rate of Point Defects by Irradiation: A Comparative Study in a Ag-24 at % Zn Alloy, for γ-Rays, Fast Electrons and Reactor Neutrons -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- RESULTS AND THEIR INTERPRETATION -- CONCLUDING REMARKS -- REFERENCES -- Chapter 23. The Migration Properties of Self-Interstitials in Concentrated α-AgZn Solid Solutions -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- BACKGROUND -- RESULTS -- CONCLUDING COMMENTS -- REFERENCES -- Chapter 24. Stress-Induced and Short Range Ordering:A Dual Approach to Vacancy Properties.Application to a Cu-30 at.% Zn Alloy -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- STRAIN RELAXATION RESULTS -- RESISTIVITY RESULTS -- COMPARISON OF ANELASTICITY AND RESISTIVITY CURVES -- APPLICATION TO THE DETERMINATION OF ACTIVATION ENERGIES -- CONCLUSION -- REFERENCES. , Chapter 25. The Zener Relaxation in Ternary Cu-Ni-Zn Alloys -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL TECHNIQUE -- EXPERIMENTAL RESULTS -- COMPUTATIONAL RESULTS OF THE PHASE DIAGRAM OF CuNiZn -- DISCUSSION AND CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- Part 3: Dislocation Damping 2 -- Chapter 26. Low-Frequency "Amplitude Peaks" in the Internal Friction Associated with theInteraction of Substitutional Solute Atom swith Dislocations in Aluminium Alloys -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- FURTHER CONFIRMATION OF THE AMPLITUDE PEAK, AGING PEAK, AND TEMPERATURE PEAK -- WHY A DISLOCATION-KINK CONCEPT ISNECESSARY -- ACKNOWLEDGEMENT -- REFERENCES -- Chapter 27. New Study of Interactions Between Dislocations and Solute Atoms in Aluminium Through Ultrasonic Attenuation Change Induced by Bias Stress -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL PROCEDURE -- MAIN RESULTS -- ACKNOWLEDGEMENT -- REFERENCE -- Chapter 28. Internal Friction and Dislocation - Solute Interactions in Titanium -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL PROCEDURE -- RESULTS -- DISCUSSION -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter 29. Influence of Doping and Deformation on the Internal Friction of Electron Irradiated Iron -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- RESULTS -- DISCUSSION -- REFERENCES -- Chapter 30. Amplitude Dependent Internal Friction and Modulus Effect in Copper Single Crystals -- EXPERIMENTAL RESULTS -- DISCUSSION -- References -- Chapter 31. Determination of Threshold Energies by Dislocation Pinning Experiments in Copper and Silver -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL TECHNICS -- RESULTS -- CONCLUSION -- REFERENCES -- Chapter 32. Some Effects of Electron Irradiation on the Internal Friction of High Purity Molybdenum -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- RESULTS. , DISCUSSION -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter 33. Relaxation Phenomena Connected with the Stage III in Irradiated Iron -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- RESULTS AND INTERPRETATION -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter 34. Transient Increase of the Magnetomechanical Damping Induced by Structural Defects in Iron -- ABSTRACT -- INTRODUCTION -- EXPERIMENTAL METHODS -- STRAINING EFFECT -- EFFECT OF PRECIPITATED CARBIDES -- CONCLUSION -- REFERENCES -- Chapter 35. Influence of d.c. Magnetic Field over Magnetomechanical Damping of High Purity Iron -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL PROCEDURES -- EXPERIMENTAL RESULTS -- INTERPRETATION. DISCUSSION -- CONCLUSION -- REFERENCES -- Chapter 36. Different Mechanisms of Anelastic and Ferromagnetic Relaxation Due to Defectsin Neutron Irradiated Iron -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- RESULTS -- DISCUSSION -- ACKNOWLEDGEMENT -- REFERENCES -- Chapter 37. Hydrogen-Dislocation Interaction and Hydrogen-Reordering Processes in Palladium/Platinum Alloys -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- RESULTS -- DISCUSSION -- ACKNOWLEDGEMENTS -- REFERENCES -- Part 4: Polymers -- Chapter 38. Dynamics of Polymer Networks at High Ultrasonic Frequencies -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- EXPERIMENTAL -- RESULTS AND DISCUSSION -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter 39. Study of the Glass Transition on Polymers by Isothermal Internal Friction Measurements -- ABSTRACT -- INTRODUCTION -- EXPERIMENTAL METHOD -- EXPERIMENTAL RESULTS -- REFERENCES -- Chapter 40. A Spectroscopic Method for Measurement of the Ultrasonic Properties of Polymers -Method and Limitations -- ABSTRACT -- KEYWORDS -- INTRODUCTION -- THE PRINCIPLE OF THE TECHNIQUE -- PRACTICAL IMPLEMENTATION -- LIMITATIONS -- CONCLUSIONS -- REFERENCES. , Chapter 41. The Evaluation of Molecular Size Distribution Parameters for Linear Chain Polymers by Means of Relaxation Experiments.
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  • 13
    Type of Medium: Book
    Pages: V, 64 S , graph. Darst
    Series Statement: Special report 26
    Language: English
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  • 14
    Type of Medium: Book
    Pages: S. 359-610. 8"
    Series Statement: (Tectonophysics 7,5/6)
    Language: Undetermined
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  • 15
    Keywords: Konferenzschrift
    Type of Medium: Book
    Pages: S. 1919 - 2174 , Ill., graph. Darst.
    Series Statement: Journal of fish biology 75.2009,8
    Language: English
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  • 16
    Book
    Book
    Luzern [u.a.] : Bucher
    Keywords: Meerestiere
    Type of Medium: Book
    Pages: 148 S. , Ill. ; 30 cm , 4°
    ISBN: 3765801224
    Uniform Title: The Hidden sea 〈dt.〉
    Language: German
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  • 17
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The localization of a plasma membrane calcium pump in the oviduct of the laying hen was investigated by immunohistochemical techniques, utilizing a monoclonal antibody (5F10) produced against the human erythrocyte calcium pump. This antibody was shown to react with an epitope of the pump in oviductal tissue, and prominent staining was observed on the microvilli of the tubular gland cells of the hen shell gland (uterus) and the isthmus. The Ca2+ pump was not detectable in the infundibulum or the magnum. Calbindin-D28k, also localized by immunohistochemical means, was observed to be present in the tubular gland cells of the shell gland and the distal isthmus (adjacent to shell gland) but not in either the proximal isthmus (adjacent to the magnum), the magnum or the infundibulum. The localization of the Ca2+ pump in the oviduct corresponds to known sites of mineral deposition during egg shell formation. The distribution of calbindin-D28k differed, co-localizing with the Ca2+ pump in the shell gland and distal isthmus but not in the proximal isthmus. This might reflect a greater rate of active Ca2+ secretion in the distal isthmus and shell gland as compared to the proximal isthmus.
    Type of Medium: Electronic Resource
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  • 18
    Publication Date: 2013-08-02
    Description: Genomes of eusocial insects code for dramatic examples of phenotypic plasticity and social organization. We compared the genomes of seven ants, the honeybee, and various solitary insects to examine whether eusocial lineages share distinct features of genomic organization. Each ant lineage contains ~4000 novel genes, but only 64 of these genes are conserved among all seven ants. Many gene families have been expanded in ants, notably those involved in chemical communication (e.g., desaturases and odorant receptors). Alignment of the ant genomes revealed reduced purifying selection compared with Drosophila without significantly reduced synteny. Correspondingly, ant genomes exhibit dramatic divergence of noncoding regulatory elements; however, extant conserved regions are enriched for novel noncoding RNAs and transcription factor–binding sites. Comparison of orthologous gene promoters between eusocial and solitary species revealed significant regulatory evolution in both cis (e.g., Creb ) and trans (e.g., fork head ) for nearly 2000 genes, many of which exhibit phenotypic plasticity. Our results emphasize that genomic changes can occur remarkably fast in ants, because two recently diverged leaf-cutter ant species exhibit faster accumulation of species-specific genes and greater divergence in regulatory elements compared with other ants or Drosophila . Thus, while the "socio-genomes" of ants and the honeybee are broadly characterized by a pervasive pattern of divergence in gene composition and regulation, they preserve lineage-specific regulatory features linked to eusociality. We propose that changes in gene regulation played a key role in the origins of insect eusociality, whereas changes in gene composition were more relevant for lineage-specific eusocial adaptations.
    Electronic ISSN: 1549-5469
    Topics: Biology , Medicine
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  • 19
    Publication Date: 2011-04-06
    Description: We report the draft genome sequence of the red harvester ant, Pogonomyrmex barbatus. The genome was sequenced using 454 pyrosequencing, and the current assembly and annotation were completed in less than 1 y. Analyses of conserved gene groups (more than 1,200 manually annotated genes to date) suggest a high-quality assembly and annotation comparable to recently sequenced insect genomes using Sanger sequencing. The red harvester ant is a model for studying reproductive division of labor, phenotypic plasticity, and sociogenomics. Although the genome of P. barbatus is similar to other sequenced hymenopterans (Apis mellifera and Nasonia vitripennis) in GC content and compositional organization, and possesses a complete CpG methylation toolkit, its predicted genomic CpG content differs markedly from the other hymenopterans. Gene networks involved in generating key differences between the queen and worker castes (e.g., wings and ovaries) show signatures of increased methylation and suggest that ants and bees may have independently co-opted the same gene regulatory mechanisms for reproductive division of labor. Gene family expansions (e.g., 344 functional odorant receptors) and pseudogene accumulation in chemoreception and P450 genes compared with A. mellifera and N. vitripennis are consistent with major life-history changes during the adaptive radiation of Pogonomyrmex spp., perhaps in parallel with the development of the North American deserts.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 20
    Publication Date: 2011-04-06
    Description: Ants are some of the most abundant and familiar animals on Earth, and they play vital roles in most terrestrial ecosystems. Although all ants are eusocial, and display a variety of complex and fascinating behaviors, few genomic resources exist for them. Here, we report the draft genome sequence of a particularly widespread and well-studied species, the invasive Argentine ant (Linepithema humile), which was accomplished using a combination of 454 (Roche) and Illumina sequencing and community-based funding rather than federal grant support. Manual annotation of 〉1,000 genes from a variety of different gene families and functional classes reveals unique features of the Argentine ant's biology, as well as similarities to Apis mellifera and Nasonia vitripennis. Distinctive features of the Argentine ant genome include remarkable expansions of gustatory (116 genes) and odorant receptors (367 genes), an abundance of cytochrome P450 genes (〉110), lineage-specific expansions of yellow/major royal jelly proteins and desaturases, and complete CpG DNA methylation and RNAi toolkits. The Argentine ant genome contains fewer immune genes than Drosophila and Tribolium, which may reflect the prominent role played by behavioral and chemical suppression of pathogens. Analysis of the ratio of observed to expected CpG nucleotides for genes in the reproductive development and apoptosis pathways suggests higher levels of methylation than in the genome overall. The resources provided by this genome sequence will offer an abundance of tools for researchers seeking to illuminate the fascinating biology of this emerging model organism.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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