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  • Documentation and Information Science  (3)
  • Lunar and Planetary Science and Exploration  (3)
  • Cell Differentiation  (2)
  • 2000-2004  (8)
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  • 1
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    Why stem cells? (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-02-26
    Description: Stem cells are viewed from the perspectives of their function, evolution, development, and cause. Counterintuitively, most stem cells may arise late in development, to act principally in tissue renewal, thus ensuring an organism's long-term survival. Surprisingly, recent reports suggest that tissue-specific adult stem cells have the potential to contribute to replenishment of multiple adult tissues.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉van der Kooy, D -- Weiss, S -- New York, N.Y. -- Science. 2000 Feb 25;287(5457):1439-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy and Cell Biology, University of Toronto Faculty of Medicine, Toronto, Ontario, M5S 1A8 Canada. derek.van.der.kooy@utoronto.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10688784" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Bone Marrow Cells/cytology/physiology ; Cell Differentiation ; Cell Division ; Cell Lineage ; Embryo, Mammalian/cytology ; Germ Cells/cytology/physiology ; Hematopoietic Stem Cells/cytology/physiology ; Humans ; Neurons/cytology ; Stem Cells/cytology/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Pregnancy-stimulated neurogenesis in the adult female forebrain mediated by prolactin (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-01-04
    Description: Neurogenesis occurs in the olfactory system of the adult brain throughout life, in both invertebrates and vertebrates, but its physiological regulation is not understood. We show that the production of neuronal progenitors is stimulated in the forebrain subventricular zone of female mice during pregnancy and that this effect is mediated by the hormone prolactin. The progenitors then migrate to produce new olfactory interneurons, a process likely to be important for maternal behavior, because olfactory discrimination is critical for recognition and rearing of offspring. Neurogenesis occurs even in females that mate with sterile males. These findings imply that forebrain olfactory neurogenesis may contribute to adaptive behaviors in mating and pregnancy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shingo, Tetsuro -- Gregg, Christopher -- Enwere, Emeka -- Fujikawa, Hirokazu -- Hassam, Rozina -- Geary, Colleen -- Cross, James C -- Weiss, Samuel -- New York, N.Y. -- Science. 2003 Jan 3;299(5603):117-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genes & Development Research Group, Department of Cell Biology and Anatomy, University of Calgary Faculty of Medicine, Calgary, Alberta, Canada T2N 4N1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12511652" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Division ; Cell Movement ; Cells, Cultured ; Choroid Plexus/metabolism ; Dentate Gyrus/cytology ; Epidermal Growth Factor/pharmacology ; Estradiol/administration & dosage/pharmacology ; Female ; Interneurons/cytology/*physiology ; Male ; Mice ; Neurons/cytology/*physiology ; Olfactory Bulb/*cytology ; Pregnancy ; Progesterone/administration & dosage/pharmacology ; Prolactin/administration & dosage/blood/pharmacology/*physiology ; Prosencephalon/*cytology/*physiology ; Pseudopregnancy ; Receptors, Prolactin/genetics/metabolism ; Signal Transduction ; Stem Cells/*cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    The Interplanetary Internet: a communications infrastructure for Mars exploration (2003)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A strategy is being developed whereby the current set of internationally standardized space data communications protocols can be incrementally evolved so that a first version of an operational "Interplanetary Internet" is feasible by the end of the decade. This paper describes its architectural concepts, discusses the current set of standard space data communications capabilities that exist to support Mars exploration and reviews proposed new developments. We also speculate that these current capabilities can grow to support future scenarios where human intelligence is widely distributed across the Solar System and day-to-day communications dialog between planets is routine. c2003 American Institute of Aeronautics and Astronautics. Published by Elsevier Science Ltd. All rights reserved.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Acta astronautica (ISSN 0094-5765); Volume 53; 4-10; 365-73
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    EUROPA2: Plan Database Services for Planning and Scheduling Applications (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: NASA missions require solving a wide variety of planning and scheduling problems with temporal constraints; simple resources such as robotic arms, communications antennae and cameras; complex replenishable resources such as memory, power and fuel; and complex constraints on geometry, heat and lighting angles. Planners and schedulers that solve these problems are used in ground tools as well as onboard systems. The diversity of planning problems and applications of planners and schedulers precludes a one-size fits all solution. However, many of the underlying technologies are common across planning domains and applications. We describe CAPR, a formalism for planning that is general enough to cover a wide variety of planning and scheduling domains of interest to NASA. We then describe EUROPA(sub 2), a software framework implementing CAPR. EUROPA(sub 2) provides efficient, customizable Plan Database Services that enable the integration of CAPR into a wide variety of applications. We describe the design of EUROPA(sub 2) from the perspective of both modeling, customization and application integration to different classes of NASA missions.
    Keywords: Documentation and Information Science
    Type: International Conference on Automated Planning and Scheduling; Unknown
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Cold Spots in the Martian Polar Regions: Evidence of Carbon Dioxide Depletion? (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Regions of very low, rapidly varying brightness temperatures have been observed near the martian winter poles by several spacecraft. One possibility is that the CO2 condensation temperature is lowered by depletion of CO2 in the air at the surface. We estimate the rate at which this low-molecular-weight air would disperse into the high-molecular-weight air above and show that it is generally faster than the rate of supply. This dispersal could be prevented if there is a strong temperature inversion (warm air above colder air) near the surface. Without an inversion, the entire atmospheric column could become depleted. However, depleted columns take a long time to form, and they are inconsistent with the rapid fluctuations in the cold spot locations and temperatures. Because low-altitude temperature inversions cannot be ruled out by existing observations, CO2 depletion is still a viable explanation for the martian cold spots.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Icarus (ISSN 0019-1035); 144; 432-435
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Rock Magnetic and Ferromagnetic Resonance Tests of Biogenic Magnetite in ALH84001 (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Three separate rock magnetic and ferromagnetic resonance tests support the hypothesis that between 25 and 50% of the fine-grained magnetite in the Martian meteorite ALH84001 was formed via biological processes. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Formalizing Resources for Planning (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this paper we present a classification scheme which circumscribes a large class of resources found in the real world. Building on the work of others we also define key properties of resources that allow formal expression of the proposed classification. Furthermore, operations that change the state of a resource are formalized. Together, properties and operations go a long way in formalizing the representation and reasoning aspects of resources for planning.
    Keywords: Documentation and Information Science
    Type: International Conference on Automated Planning and Scheduling (13th); Jan 01, 2003; Trento; Italy
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Identifying Executable Plans (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Generating plans for execution imposes a different set of requirements on the planning process than those imposed by planning alone. In highly unpredictable execution environments, a fully-grounded plan may become inconsistent frequently when the world fails to behave as expected. Intelligent execution permits making decisions when the most up-to-date information is available, ensuring fewer failures. Planning should acknowledge the capabilities of the execution system, both to ensure robust execution in the face of uncertainty, which also relieves the planner of the burden of making premature commitments. We present Plan Identification Functions (PIFs), which formalize what it means for a plan to be executable, md are used in conjunction with a complete model of system behavior to halt the planning process when an executable plan is found. We describe the implementation of plan identification functions for a temporal, constraint-based planner. This particular implementation allows the description of many different plan identification functions. characteristics crf the ~xec~~tieonfvii r~nm-enft,h e best plan to hand to the execution system will contain more or less commitment and information.
    Keywords: Documentation and Information Science
    Type: Plan Execution Workshop - 13th International Conferece on Automated Planning and Scehduling; Jun 01, 2003; Trento; Italy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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