In-Situ XRF Measurements in Lunar Surface Exploration Using Apollo Samples as a Standard

Samples collected during the Apollo lunar surface missions were sampled and returned to Earth by astronauts with varying degrees of geological experience. The technology used in these EVAs, or extravehicular activities, included nothing more advanced than traditional terrestrial field instruments: rock hammer, scoop, claw tool, and sample bags. 40 years after Apollo, technology is being developed that will allow for a high-resolution geochemical map to be created in the field real-time. Handheld x-ray fluorescence (XRF) technology is one such technology. We use handheld XRF to enable a broad in-situ characterization of a geologic site of interest based on fairly rapid techniques that can be implemented by either an astronaut or a robotic explorer. The handheld XRF instrument we used for this study was the Innov-X Systems Delta XRF spectrometer

Alien Registration- Wedge, Joseph Mosie E. (Bangor, Penobscot County)

https://digitalmaine.com/alien_docs/10095/thumbnail.jp

Alien Registration- Wedge, Joseph Mosie E. (Bangor, Penobscot County)

https://digitalmaine.com/alien_docs/10095/thumbnail.jp

Low oxygen: A (tough) way of life for Okavango fishes.

Botswana's Okavango Delta is a World Heritage Site and biodiverse wilderness. In 2016-2018, following arrival of the annual flood of rainwater from Angola's highlands, and using continuous oxygen logging, we documented profound aquatic hypoxia that persisted for 3.5 to 5 months in the river channel. Within these periods, dissolved oxygen rarely exceeded 3 mg/L and dropped below 0.5 mg/L for up to two weeks at a time. Although these dissolved oxygen levels are low enough to qualify parts of the Delta as a dead zone, the region is a biodiversity hotspot, raising the question of how fish survive. In association with the hypoxia, histological samples, collected from native Oreochromis andersonii (threespot tilapia), Coptodon rendalli (redbreast tilapia), and Oreochromis macrochir (greenhead tilapia), exhibited widespread hepatic and splenic inflammation with marked granulocyte infiltration, melanomacrophage aggregates, and ceroid and hemosiderin accumulations. It is likely that direct tissue hypoxia and polycythemia-related iron deposition caused this pathology. We propose that Okavango cichlids respond to extended natural hypoxia by increasing erythrocyte production, but with significant health costs. Our findings highlight seasonal hypoxia as an important recurring stressor, which may limit fishery resilience in the Okavango as concurrent human impacts rise. Moreover, they illustrate how fish might respond to hypoxia elsewhere in the world, where dead zones are becoming more common

HIS HAND IN MINE / Elvis PRESLEY

Comprend : HIS HAND IN MINE / M. LISTER - I'M GONNA WALK DEM GOLDEN STAIRS / arr. Elvis PRESLEY - IN MY FATHER'S HOUSE / arr. E. PRESLEY - MILKY WHITE WAY / arr. E. PRESLEY - KNOWN ONLY TO HIM / S. HAMBLEN - I BELIEVE IN THE MAN IN THE SKY / R. HOWARD - I BELIEVE IN THE MAN IN THE SKY / R. HOWARD - JOSHUA FIT THE BATTLE / arr. E. PRESLEY - JESUS KNOWS WHAT I NEED / M. LISTER - SWING DOWN, SWEET CHARIOT / arr. E. PRESLEY - MANSION EVER THE HILLTOP / I. STANPHILL - IF WE NEVER MEET AGAIN / A.E. BRUMLEY - WORKING ON THE BUILDING / W.O. HOYLE et L.M. BOWLESBnF-Partenariats, Collection sonore - BelieveContient une table des matière