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  • 1
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    Isolation and identification of nematode-antagonistic compounds from the fungus Aspergillus candidus (2016)
    Oxford University Press
    Details
    Publication Date: 2016-02-20
    Description: Culture medium from an isolate of the fungus Aspergillus candidus was extracted, fractionated and examined to discover compounds antagonistic to plant-parasitic nematodes that are important pathogens of agricultural crops. Column, thin layer and preparative chromatographies and spectral and elemental analyses, were used to isolate and identify two major constituents of an active fraction (Fraction F) obtained from the medium. Compound 1 was identified as 2-hydroxypropane-1, 2, 3-tricarboxylic acid (citric acid). Compound 2 was identified as 3-hydroxy-5-methoxy-3-(methoxycarbonyl)-5-oxopentanoic acid, an isomer of 1, 2-dimethyl citrate. Compound 1 and a citric acid standard, each tested at 50 mg mL –1 in water, decreased hatch from eggs of the plant-parasitic nematode Meloidogyne incognita by more than 94%, and completely immobilized second-stage juveniles after 4–6 days exposure. Fraction F and Compounds 1 and 2 decreased the mobility of adults of the plant-parasitic nematode Ditylenchus destructor in vitro . Fraction F (25 mg mL –1 ) inhibited mobility 〉99% at 72 hrs. Compounds 1 and 2 (50 mg mL –1 ) each inhibited mobility more than 25% at 24 hr and more than 50% at 72 hr. This is the first assignment of nematode-antagonistic properties to specifically identified A. candidus metabolites.
    Keywords: Pathogens & Pathogenicity
    Print ISSN: 0378-1097
    Electronic ISSN: 1574-6968
    Topics: Biology
    Published by Oxford University Press
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    PAPER CURRENT
  • 2
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    Advanced Colloids Experiment (Temperature Controlled) - ACE-T9 (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: No abstract available
    Keywords: Physics (General)
    Type: GRC-E-DAA-TN37909
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Developing Data Services to Provide Data Quality Information for Global Satellite-Based Precipitation Products (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Global satellite-based precipitation products have been widely used in research and applications around the world. Compared to ground-based observations, satellite-based measurements provide data on a global scale, especially in remote continents and over oceans. The NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC) is home to NASA global precipitation product archives including the Tropical Rainfall Measuring Mission (TRMM), the Global Precipitation Measurement (GPM), as well as other global and regional precipitation products. Precipitation is one of the top downloaded and accessed parameters in the GES DISC data archive. Meanwhile, users want to easily locate and obtain data quality information at regional and global scales to better understand how precipitation products perform and how reliable they are. As a data service provider, it is necessary to provide easy access to data quality information. However, such information normally is not available, and when it is available, it is not in one place and difficult to locate. In this presentation, we will present such challenges and activities at the GES DISC to address precipitation data (other datasets as well) quality issues.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN62899 , Workshop of the International Precipitation Working Group; Nov 05, 2018 - Nov 09, 2018; Seoul; Korea, Democratic People''s Republic of
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    GPM, TRMM, and Other Global Precipitation Products and Services at NASA GES DISC (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Precipitation is a key environmental variable. For example, in agriculture, precipitation, temperature, water (soil moisture), solar radiation, NDVI, etc., are key variables.Rainfed agriculture major farming practices that rely on rainfall for water.Rainfed agriculture: 〉95% of farmed land (sub-Saharan Africa); 90% (Latin America); 75% (Near East and North Africa); 65% (East Asia); 60% (South Asia).Droughts and floods can cause severe crop loss. The Goddard Earth Sciences (GES) Data and Information Services Center (DISC), one of 12 NASA data centers, is located in Greenbelt, Maryland, USA. The NASA GES DISC is a major data archive center for global precipitation, water & energy cycles, atmospheric composition, and climate variability.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN62904 , Workshop of the International Precipitation Working Group (IPWG-9); Nov 05, 2018 - Nov 09, 2018; Seoul; Korea, Democratic People''s Republic of
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Microscopes on ISS - Present and Future Possibilities (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The attached slides are for an invited talk (invitation from Ken Savins at CASIS) to be given July 19 at the "2018 Microgravity Molecular Crystal Growth Workshop". Ken Savins indicated that the protein crystal growth community would benefit from knowing more about what is available on ISS for microscopy. It is especially important that the folks growing protein crystals start to use the microscopes on ISS as diagnostic tools so that when their samples are returned to Earth and the results are unexpected, they are able to determine whether or not the return flight had an impact. In additional to preparing this presentation describing present and possible future LMM capabilities (if it is refurbished), we worked with Rachel A Ormsby (techshot) and Devin Ridgley (HNu Photonics) to add slides and a movie they provided of their capacities. Contact information for the NASA GRC Liquid Crystal Facility (LCF) will be included, and a couple of slides for LCF may be added when the contractor (James Kolibas at ZIN Technology) returns from vacation.
    Keywords: Physics (General)
    Type: GRC-E-DAA-TN58674 , Microgravity Molecular Crystal Growth Workshop; Jul 19, 2018; Buffalo, NY; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Advanced Colloids Experiment (Temperature Controlled) - ACE-T12 (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Increment 57-58 Science Symposium presentation of Advanced Colloids Experiment (ACE-T12) to RPO. The purpose of this event is for Principal Investigators to present their science objectives, testing approach, and measurement methods to agency scientists, managers, and other investigators. This flight experiment was added after the Science Symposium, so these charts for more for reference, than presentation.
    Keywords: Physics (General)
    Type: GRC-E-DAA-TN63790 , Post - Increment 57 - 58 Science Symposium; Dec 31, 2018; Web Ex
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The Best Educational Tool for Interdisciplinary Earth Science Giovanni (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Accessing and using NASA Earth science data has commonly presented a challenge to many educators and students, due to issues such as heterogeneous data formats, complex data structures, large volumes of data storage, special programming requirements, and diverse analytical software options that often require a significant investment in time and resources, especially for novices. By facilitating data access and evaluation, as well as promoting open access to create a more level playing field for non-funded scientists, NASA Earth observation data can be more readily used for scientific discovery and societal benefits. To advance this goal, the NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC) developed the Geospatial Interactive Online Visualization ANd aNalysis Infrastructure (Giovanni). To date, Giovanni has assisted researchers around the world publish over 1300 peer-reviewed papers in a wide range of Earth science disciplines. In this presentation, we will demonstrate how easy it is to use Giovanni for the rapid creation of many different analyses of both weather and climate events.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN57881 , Asia Oceania Geosciences Society (AOGS) Annual Meeting; Jun 03, 2018 - Jun 08, 2018; Honolulu, HI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    NASA GES DISC Earth Science Data Support (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: It is the NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC) mission statement to facilitate data access and evaluation, as well as scientific exploration and discovery. Recently, GES DISC has been evolving and improving our data management and services in order to promote GES DISC data to be easily discovered, improve usage and made more interoperable with common tools. As a result, we will present a brief review of our recent data services at the GES DISC including our new science-data driven website, subsetting and resampling services across multitude of satellite processing levels, visualization services, and how we utilize social media tools to interact with user communities.
    Keywords: Geosciences (General)
    Type: IG08-A21 , GSFC-E-DAA-TN57883 , AOGS (Asia Oceania Geosciences Society) Annual Meeting; Jun 03, 2018 - Jun 08, 2018; Honolulu, HI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Advanced Colloids Experiment (Temperature Controlled) - ACE-T6 (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Increment 53 - 54 Science Symposium presentation of Advanced Colloids Experiment (ACE-T6) to RPO. The purpose of this event is for Principal Investigators to present their science objectives, testing approach, and measurement methods to agency scientists, managers, and other investigators.
    Keywords: Physics (General)
    Type: GRC-E-DAA-TN44673
    Format: application/pdf
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  • 10
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    Advanced Colloids Experiment (Temperature Controlled) - ACE-T9 (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Increment 53 - 54 Science Symposium presentation of Advanced Colloids Experiment (ACE-T9) to RPO. The purpose of this event is for Principal Investigators to present their science objectives, testing approach, and measurement methods to agency scientists, managers, and other investigators.
    Keywords: Physics (General)
    Type: GRC-E-DAA-TN44672
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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