More Like this

1. LIGHTCURVES AND ROTATIONAL PERIODS OF FOUR MAIN BELT ASTERIODS

   Teer, Allan; Montgomery, Kent (April 2020, The Minor planet bulletin)

   Lightcurves and rotational periods were determined for the following four asteroids: 1120 Cannonia: 3.810 ± 0.003 h; 6801 Strekov: 6.171 ± 0.016 h; (28885) 2000 KH56: 3.326 ± 0.001 h; and 87312 Akirasuzuki: 3.0439 ± 0.0007 h. 

   more » « less
2. DETERMINING THE ROTATIONAL PERIODS AND LIGHTCURVES OF MAIN BELT ASTEROIDS

   Shandi Groezinger, Shandi; Montgomery, Kent (April 2020, The Minor planet bulletin)

   Lightcurves and rotational periods are presented for six main-belt asteroids. The rotational periods determined are 970 Primula (2.777 ± 0.001 h), 1103 Sequoia (3.1125 ± 0.0004 h), 1160 Illyria (4.103 ± 0.002 h), 1188 Gothlandia (3.52 ± 0.05 h), 1831 Nicholson (3.215 ± 0.004 h) and (11230) 1999 JV57 (7.090 ± 0.003 h). 

   more » « less
3. Fluids of the Lower Crust: Deep Is Different

   https://doi.org/10.1146/annurev-earth-060614-105224  

   Manning, Craig E. (May 2018, Annual Review of Earth and Planetary Sciences)

   Deep fluids are important for the evolution and properties of the lower continental and arc crust in tectonically active settings. They comprise four components: H 2 O, nonpolar gases, salts, and rock-derived solutes. Contrasting behavior of H 2 O-gas and H 2 O-salt mixtures yields immiscibility and potential separation of phases with different chemical properties. Equilibrium thermodynamic modeling of fluid-rock interaction using simple ionic species known from shallow-crustal systems yields solutions too dilute to be consistent with experiments and resistivity surveys, especially if CO 2 is added. Therefore, additional species must be present, and H 2 O-salt solutions likely explain much of the evidence for fluid action in high-pressure settings. At low salinity, H 2 O-rich fluids are powerful solvents for aluminosilicate rock components that are dissolved as polymerized clusters. Addition of salts changes solubility patterns, but aluminosilicate contents may remain high. Fluids with X salt = 0.05 to 0.4 in equilibrium with model crustal rocks have bulk conductivities of 10 −1.5 to 100 S/m at porosity of 0.001. Such fluids are consistent with observed conductivity anomalies and are capable of the mass transfer seen in metamorphic rocks exhumed from the lower crust. 

   more » « less
4. Amphibalanus amphitrite begins exoskeleton mineralization within 48 hours of metamorphosis

   https://doi.org/10.1098/rsos.200725  

   Metzler, Rebecca A.; O'Malley, Jessica; Herrick, Jack; Christensen, Brett; Orihuela, Beatriz; Rittschof, Daniel; Dickinson, Gary H. (September 2020, Royal Society Open Science)

   null (Ed.)

   Barnacles are ancient arthropods that, as adults, are surrounded by a hard, mineralized, outer shell that the organism produces for protection. While extensive research has been conducted on the glue-like cement that barnacles use to adhere to surfaces, less is known about the barnacle exoskeleton, especially the process by which the barnacle exoskeleton is formed. Here, we present data exploring the changes that occur as the barnacle cyprid undergoes metamorphosis to become a sessile juvenile with a mineralized exoskeleton. Scanning electron microscope data show dramatic morphological changes in the barnacle exoskeleton following metamorphosis. Energy-dispersive X-ray spectroscopy indicates a small amount of calcium (8%) 1 h post-metamorphosis that steadily increases to 28% by 2 days following metamorphosis. Raman spectroscopy indicates calcite in the exoskeleton of a barnacle 2 days following metamorphosis and no detectable calcium carbonate in exoskeletons up to 3 h post-metamorphosis. Confocal microscopy indicates during this 2 day period, barnacle base plate area and height increases rapidly (0.001 mm 2 h −1 and 0.30 µm h −1 , respectively). These results provide critical information into the early life stages of the barnacle, which will be important for developing an understanding of how ocean acidification might impact the calcification process of the barnacle exoskeleton. 

   more » « less
5. Dyskinesia estimation during activities of daily living using wearable motion sensors and deep recurrent networks

   https://doi.org/10.1038/s41598-021-86705-1  

   Hssayeni, Murtadha D.; Jimenez-Shahed, Joohi; Burack, Michelle A.; Ghoraani, Behnaz (December 2021, Scientific Reports)

   null (Ed.)

   Abstract Levodopa-induced dyskinesias are abnormal involuntary movements experienced by the majority of persons with Parkinson’s disease (PwP) at some point over the course of the disease. Choreiform as the most common phenomenology of levodopa-induced dyskinesias can be managed by adjusting the dose/frequency of PD medication(s) based on a PwP’s motor fluctuations over a typical day. We developed a sensor-based assessment system to provide such information. We used movement data collected from the upper and lower extremities of 15 PwPs along with a deep recurrent model to estimate dyskinesia severity as they perform different activities of daily living (ADL). Subjects performed a variety of ADLs during a 4-h period while their dyskinesia severity was rated by the movement disorder experts. The estimated dyskinesia severity scores from our model correlated highly with the expert-rated scores ( r = 0.87 ( p < 0.001)), which was higher than the performance of linear regression that is commonly used for dyskinesia estimation ( r = 0.81 ( p < 0.001)). Our model provided consistent performance at different ADLs with minimum r = 0.70 (during walking) to maximum r = 0.84 (drinking) in comparison to linear regression with r = 0.00 (walking) to r = 0.76 (cutting food). These findings suggest that when our model is applied to at-home sensor data, it can provide an accurate picture of changes of dyskinesia severity facilitating effective medication adjustments. 

   more » « less