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  • 1
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    Porpoise fisheries in the southern Caribbean: present utilizations and future potentials (2021)
    In:  http://aquaticcommons.org/id/eprint/12226 | 9603 | 2013-11-11 09:05:14 | 12226 | Gulf and Caribbean Fisheries Institute
    Details
    Publication Date: 2021-06-27
    Keywords: Fisheries ; GCFI
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 195-206
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  • 2
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    Whales, dolphins, and porpoises of the western North Atlantic: a guide to their identification (2021)
    U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service | Seattle, WA
    In:  http://aquaticcommons.org/id/eprint/1417 | 155 | 2011-09-29 20:35:34 | 1417 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-08
    Description: This is an identification guide for cetaceans (whales, dolphins, and porpoises). It was designed to assist laypersons in identifying cetaceans encountered in the western North Atlantic Ocean and was intended for use by ongoing cetacean observer programs. This publication includes sections on identifying cetaceans at sea as well as stranded animals on shore. Species accounts are divided by body size and presence or lack of a dorsal fin. Appendices cover tags used on cetacean species; how to record and report cetacean observations at see and for stranded cetaceans; and a list of contacts for reporting cetacean strandings. (Document pdf contains 183 pages - file takes considerable time to open)
    Description: Platforms of Opportunity Program, NMFS, NOAA
    Description: Scanned by the Alaska Fisheries Science Center, NMFS, NOAA, August 2008.
    Keywords: Management ; Conservation ; Ecology ; Fisheries ; Biology ; Environment ; whale ; dolphin ; porpoise ; cetacean ; marine mammal ; species identification ; North Atlantic Ocean ; National Oceanic and Atmospheric Administration ; National Marine Fisheries Service
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 3
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    A conformational switch driven by phosphorylation regulates the activity of the evolutionarily conserved SNARE Ykt6 (2021)
    National Academy of Sciences
    Details
    Publication Date: 2021-03-15
    Description: Ykt6 is a soluble N-ethylmaleimide sensitive factor activating protein receptor (SNARE) critically involved in diverse vesicular fusion pathways. While most SNAREs rely on transmembrane domains for their activity, Ykt6 dynamically cycles between the cytosol and membrane-bound compartments where it is active. The mechanism that regulates these transitions and allows Ykt6 to achieve specificity toward vesicular pathways is unknown. Using a Parkinson’s disease (PD) model, we found that Ykt6 is phosphorylated at an evolutionarily conserved site which is regulated by Ca2+ signaling. Through a multidisciplinary approach, we show that phosphorylation triggers a conformational change that allows Ykt6 to switch from a closed cytosolic to an open membrane-bound form. In the phosphorylated open form, the spectrum of protein interactions changes, leading to defects in both the secretory and autophagy pathways, enhancing toxicity in PD models. Our studies reveal a mechanism by which Ykt6 conformation and activity are regulated with potential implications for PD.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Therapeutic genetic variation revealed in diverse Hsp104 homologs (2020)
    eLife Sciences Publications
    Details
    Publication Date: 2020-12-15
    Description: The AAA+ protein disaggregase, Hsp104, increases fitness under stress by reversing stress-induced protein aggregation. Natural Hsp104 variants might exist with enhanced, selective activity against neurodegenerative disease substrates. However, natural Hsp104 variation remains largely unexplored. Here, we screened a cross-kingdom collection of Hsp104 homologs in yeast proteotoxicity models. Prokaryotic ClpG reduced TDP-43, FUS, and a-synuclein toxicity, whereas prokaryotic ClpB and hyperactive variants were ineffective. We uncovered therapeutic genetic variation among eukaryotic Hsp104 homologs that specifically antagonized TDP-43 condensation and toxicity in yeast and TDP-43 aggregation in human cells. We also uncovered distinct eukaryotic Hsp104 homologs that selectively antagonized a-synuclein condensation and toxicity in yeast and dopaminergic neurodegeneration in C. elegans. Surprisingly, this therapeutic variation did not manifest as enhanced disaggregase activity, but rather as increased passive inhibition of aggregation of specific substrates. By exploring natural tuning of this passive Hsp104 activity, we elucidated enhanced, substrate-specific agents that counter proteotoxicity underlying neurodegeneration.
    Electronic ISSN: 2050-084X
    Topics: Biology , Medicine , Natural Sciences in General
    Published by eLife Sciences Publications
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  • 5
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    Conserved nicotine-activated neuroprotective pathways involve mitochondrial stress (2021)
    Cell Press
    Details
    Publication Date: 2021-03-01
    Electronic ISSN: 2589-0042
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Natural Sciences in General , Physics
    Published by Cell Press
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  • 6
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    Back to the Future: Surveying the Northern Hemisphere and Reprocessing the Southern TESS Data Set (2020)
    In:  CASI
    Details
    Publication Date: 2020-01-22
    Description: TESS launched 18 April 2018 to conduct a two-year, near all-sky survey for at least 50 small, nearby exoplanets for which masses can be ascertained and whose atmospheres can be characterized by ground- and space-based follow-on observations. TESS has completed its survey of the southern hemisphere and begun its survey of the northern hemisphere, identifying 〉1000 candidate exoplanets and unveiling a plethora of exciting non-exoplanet astrophysics results, such as asteroseismology, asteroids, and supernova. The TESS Science Processing Operations Center (SPOC) processes the data downlinked every two weeks to generate a range of data products hosted at the Mikulski Archive for Space Telescopes (MAST). For each sector (~1 month) of observations, the SPOC calibrates the image data for both 30-min Full Frame Images (FFIs) and up to 20,000 pre-selected 2-min target star postage stamps. Data products for the 2-min targets include simple aperture photometry and systematic error-corrected flux time series. The SPOC also conducts searches for transiting exoplanets in the 2-min data for each sector and generates Data Validation time series and associated reports for each transit-like feature identified in the search. Multi-sector searches for exoplanets are conducted periodically to discover longer period planets, including those in the James Webb Continuous Viewing Zone (CVZ), which are observed for up to one year. Starting with Sector 8, scattered light from the Earth and Moon contaminated significant portions of the data in each orbit. We have developed algorithms for automated identification of the scattered light features at the individual target level. Previously, data for all stars on a CCD affected by scattered light were manually excluded. The automated flagging will allow us to retain significantly more data for stars that are not affected by the scattered light even though it is occurring elsewhere on the CCD. We also discuss enhancements to the SPOC pipeline and the newly available FFI light curves. The TESS Mission is funded by NASA's Science Mission Directorate as an Astrophysics Explorer Mission.
    Keywords: Astrophysics
    Type: ARC-E-DAA-TN76812 , American Astronomical Society Meeting; Jan 04, 2020 - Jan 08, 2020; Honolulu, HI; United States
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  • 7
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    Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)1 (2021)
    Taylor & Francis
    Details
    Publication Date: 2021-01-02
    Print ISSN: 1554-8627
    Electronic ISSN: 1554-8635
    Topics: Biology
    Published by Taylor & Francis
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  • 8
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    A habitat-use model to determine essential fish habitat for juvenile brown shrimp (Farfantepenaeus aztecus) in Galveston Bay, Texas (2021)
    In:  http://aquaticcommons.org/id/eprint/15048 | 403 | 2014-05-27 14:21:56 | 15048 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-01
    Description: A density prediction model for juvenile brown shrimp (Farfantepenaeus aztecus) was developed by using three bottom types, five salinity zones, and four seasons to quantify patterns of habitat use in Galveston Bay, Texas. Sixteen years of quantitative density data were used. Bottom types were vegetated marsh edge, submerged aquatic vegetation, and shallow nonvegetated bottom. Multiple regression was used to develop density estimates, and the resultant formula was then coupled with a geographical information system (GIS) to provide a spatial mosaic (map) of predicted habitat use. Results indicated that juvenile brown shrimp (〈100 mm) selected vegetated habitats in salinities of 15−25 ppt and that seagrasses were selected over marsh edge where they co-occurred. Our results provide a spatially resolved estimate of high-density areas that will help designate essential fish habitat (EFH) in Galveston Bay. In addition, using this modeling technique, we were able to provide an estimate of the overall population of juvenile brown shrimp (〈100 mm) in shallow water habitats within the bay of approximately 1.3 billion. Furthermore, the geographic range of the model was assessed by plotting observed (actual) versus expected (model) brown shrimp densities in three other Texas bays. Similar habitat-use patterns were observed in all three bays—each having a coefficient of determination 〉0.50. These results indicate that this model may have a broader geographic application and is a plausible approach in refining current EFH designations for all Gulf of Mexico estuaries with similar geomorphological and hydrological characteristics.
    Keywords: Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 264-277
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  • 9
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    Productivity of Florida Springs: first semi-annual report to Biology Division, Office of Naval Research, progress from June 1, 1952 to January 31, 1953 (2021)
    University of Florida, College of Arts and Sciences, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/369 | 3 | 2011-09-29 22:09:52 | 369
    Details
    Publication Date: 2021-06-29
    Description: Work has begun on studying the factors responsible for productivityin the Florida springs, which are nearly constant temperature, constantchemical, steady state giant laboratories. Progress has been made on fiveaspects: qualitative description, quantitative description, completionof knowledge of chemical factors, measurement of productivity , developmentof productivity theory.Measurement of the primary productivity in Silver Springs and GreenCove Springs by two new methods: the raising of organisms in cages, and themeasurement of night & day differences in oxygen downstream agree roughly.Production in these springs is greater than previous production figures reportedfor marine, fresh water, and land areas. Instantaneous measures of production show large variations with season, time of day, cloud cover. Productionestimates range from 11,000 lbs per acre per year to 70,000 lbs. glucose peracre per year during daylight hours.Essential stability of the springs environment has been shown withrespect to temperature, phosphorus, and plant cover. A correlation of speciesnumber with lack of stability has been shown with insects. Quantitativestudies have shown very large plant base to pyramids of mass. Correlationof marine invasion with chlorinity has been shown. The essential aspects ofpH regulated phosphorus geochemistry in Florida have been outlined. Sometheoretical ideas on productivity have been evolved. Mapping of sessileorganisms in springs and taxonomic identification of dominants are halfcompleted. Plans for second six months include measurement of herbivoreand carnivore production rates and completion of food chain efficiencydeterminations in Silver Springs as a preparation for subsequentcomparisons between springs. (34pp.)
    Keywords: Ecology ; Limnology ; springs ; Florida ; productivity
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 10
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    Productivity of Florida Springs: Second annual report to Biology Branch, Office of Naval Research progress from January 1 to December 31, 1954 (2021)
    University of Florida, Gainesville, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/373 | 3 | 2011-09-29 22:09:11 | 373
    Details
    Publication Date: 2021-06-29
    Description: Production measurements at different times of the year indicate a linear relationship of light intensity and overall production at about 8% of the visible light energy reaching plant level. Measurements of a coral reef at Eniwetok indicate 6%. Further evidence of breeding at all seasons but with a quantitative pulse in the seasons of maximum light indicates that the seasonal fluctuation in primary production is routed through reproduction rather than through major changes in populations. The succession of plants and anmals of the aufwuchs has been shown with glass slides and counts from Sagittaria blades. Losss of oxygen bubbles during the day and emergence of aquatic insects at night have been measured with funnels. Bell jar measurements are reported for bacterial metabolism on mud surfaces. pH determined CO2 uptake agrees with titration determinations. A few rough estimates of herbivore production have been made from caged snails, aufwuchs succession, and fish tagging. Nitrate uptake a night by aufwuchs communities has been confirmed in a circulating microcosm experiment as well as in bell jars in the springs. Distributions of oxygen and organisms have been used to criticize the saprobe stream classification system. Theoretical consideration of maximum photosynthetic rates in teh literature data indicates logarithmic rate variation inversely with organismal size just as for respiratory metabolism. Extreme pyramid shapes are thus shown for communities in which organismal size decreases up the food chain and for other communities with the same energy influx but with organismal size increasing up the food chain. Literature data is used to further demonstrate the validity of the optimum efficiency-maximum power principle for photosynthesis. Work on plants by Dr. Delle Natelson indicates essential stability of aquatic plant communities after 3 years and about 10-20% reproducibility in previous biomass estimates by Davis. Work on an animal picture of the fishery characteristics by Caldwell, Barry, and Odum is half completed. The study of aquatic insects in relationship to spring gradients by W.C. Sloan has been completed an an M.S. thesis. J. Yount has begun a study of affect of total productivity on community composition using aufwuchs organisms on glass slides placed in different current and light conditions in Silver Springs. (49pp.)
    Keywords: Ecology ; Limnology ; Silver springs ; springs ; insects ; algae ; aufwuchs ; diatoms ; productivity ; Florida ; fishes
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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