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6 results on '"Amundson, H."'

1. In Situ Geologic Context Mapping Transect on the Floor of Jezero Crater From Mars 2020 Perseverance Rover Observations

Author

Crumpler, L. S., primary, Horgan, B. H. N., additional, Simon, J. I., additional, Stack, K. M., additional, Alwmark, S., additional, Dromart, G., additional, Wiens, R. C., additional, Udry, A., additional, Brown, A. J., additional, Russell, P., additional, Amundson, H. E. F., additional, Hamran, S.‐E., additional, Bell, J., additional, Shuster, D., additional, Calef, F. J., additional, Núñez, J., additional, Cohen, B. A., additional, Flannery, D., additional, Herd, C. D. K., additional, Hand, K. P., additional, Maki, J. N., additional, Schmidt, M., additional, Golombek, M. P., additional, and Williams, N. R., additional

Published
2023
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2. In Situ Geologic Context Mapping Transect on the Floor of Jezero Crater from Mars 2020 Perseverance Rover Observations

Author

Crumpler, L. S., Horgan, B., Simon, J., Stack, K., Alwmark, S., Gilles, D., Wiens, R., Udry, A., Brown, A., Russell, P., Amundson, H., Hamran, S‐e., Bell, J., Shuster, D., Calef, F., Núñez, J., Cohen, B., Flannery, D., Herd, C. D. K., Hand, K., Maki, J., Schmidt, M., Golombek, M., Williams, N., Crumpler, L. S., Horgan, B., Simon, J., Stack, K., Alwmark, S., Gilles, D., Wiens, R., Udry, A., Brown, A., Russell, P., Amundson, H., Hamran, S‐e., Bell, J., Shuster, D., Calef, F., Núñez, J., Cohen, B., Flannery, D., Herd, C. D. K., Hand, K., Maki, J., Schmidt, M., Golombek, M., and Williams, N.

Abstract

In situ geologic context mapping (GXM) based on rover and helicopter observations provides documentation of a nearly continuous record of geology and exposed surface structure over a 120 m-wide corridor along the traverse of the Mars 2020 /Perseverance rover. The results record the geologic context of Mars 2020 campaign sites and sample sites including the local extent of bedrock outcrops, stratigraphy, attitude, and structure from imaging and rover-based remote sensing, and outcrop lithology based on in situ proximity science. Mapping identifies a sequence of igneous lithologies including: (1) early mafic, possibly intrusive, rocks; (2) pervasively fractured and deeply altered massive bedrock of undetermined protolith; (3) buried and exhumed lava flows with pahoehoe and aa textures; (4) several varieties of regolith; and (5) small impact craters.

Published
2023

3. delta C-13 Analysis of Mars Analog Carbonates Using Evolved Gas Cavity - Ringdown Spectrometry on the 2010 Arctic Mars Analog Svalbard Expedition (AMASE)

Author

Stern, J. C, McAdam, A. C, ten Kate, I. L, Mahaffy, P. R, Steele, A, and Amundson, H. E. F

Subjects
Lunar And Planetary Science And Exploration
Abstract

The 2010 Arctic Mars Analog Svalbard Expedition (AMASE) investigated two distinct geologic settings on Svalbard, using instrumentation and techniques in development for future Mars missions, such as the Mars Science Laboratory (MSL), ExoMars, and Mars Sample Return (MSR). The Sample Analysis at Mars (SAM) instrument suite, which will fly on MSL, was developed at Goddard Space Flight Center (GSFC), together with several partners. SAM consists of a quadrupole mass spectrometer (QMS), a gas chromatograph CGC), and a tunable laser spectrometer (TLS), which all analyze gases created by evolved gas analysis (EGA). The two sites studied represent "biotic" and "abiotic" analogs; the "biotic" site being the Knorringfjell fossil methane seep, and the "abiotic" site being the basaltic Sigurdfjell vent complex. The data presented here represent experiments to measure the carbon isotopic composition of carbonates from these two analogs using evolved gas analysis coupled with a commercial cavity ringdown CO2 isotopic analyzer (Picarro) as a proxy for the TLS on SAM.

Published
2011

4. Field Characterization of the Mineralogy and Organic Chemistry of Carbonates from the 2010 Arctic Mars Analog Svalbard Expedition by Evolved Gas Analysis

Author

McAdam, A. C, Ten Kate, I. L, Stern, J. C, Mahaffy, P. R, Blake, D. F, Morris, R. V, Steele, A, and Amundson, H. E. F

Subjects
Geophysics
Abstract

The 2010 Arctic Mars Analog Svalbard Expedition (AMASE) investigated two geologic settings using methodologies and techniques being developed or considered for future Mars missions, such as the Mars Science Laboratory (MSL), ExoMars, and Mars Sample Return. The Sample Analysis at Mars (SAM) [1] instrument suite, which will be on MSL, consists of a quadrupole mass spectrometer (QMS), a gas chromatograph (GC), and a tunable laser mass spectrometer (TLS); all will be applied to analyze gases created by pyrolysis of samples. During AMASE, a Hiden Evolved Gas Analysis-Mass Spectrometer (EGA-MS) system represented the EGA-MS capability of SAM. Another MSL instrument, CheMin, will use x-ray diffraction (XRD) and x-ray fluorescence (XRF) to perform quantitative mineralogical characterization of samples [e.g., 2]. Field-portable versions of CheMin were used during AMASE. AMASE 2010 focused on two sites that represented biotic and abiotic analogs. The abiotic site was the basaltic Sigurdfjell vent complex, which contains Mars-analog carbonate cements including carbonate globules which are excellent analogs for the globules in the ALH84001 martian meteorite [e.g., 3, 4]. The biotic site was the Knorringfjell fossil methane seep, which featured carbonates precipitated in a methane-supported chemosynthetic community [5]. This contribution focuses on EGA-MS analyses of samples from each site, with mineralogy comparisons to CheMin team results. The results give insight into organic content and organic-mineral associations, as well as some constraints on the minerals present.

Published
2011

6. How are we diagnosing cardiometabolic risk in primary care settings?

Author

Gohdes D, Amundson H, Oser CS, Helgerson SD, and Harwell TS

Subjects
Attitude of Health Personnel, Biomarkers blood, Blood Glucose metabolism, Body Mass Index, Cardiovascular Diseases economics, Cardiovascular Diseases prevention & control, Counseling, Diabetes Mellitus, Type 2 economics, Diabetes Mellitus, Type 2 etiology, Diabetes Mellitus, Type 2 therapy, Female, Glucose Tolerance Test, Glycated Hemoglobin metabolism, Health Care Surveys, Health Knowledge, Attitudes, Practice, Health Services Accessibility, Humans, Insurance, Health, Reimbursement, Male, Metabolic Syndrome economics, Metabolic Syndrome etiology, Metabolic Syndrome therapy, Middle Aged, Montana, Motivation, Overweight economics, Overweight therapy, Patient Acceptance of Health Care, Prediabetic State economics, Prediabetic State etiology, Prediabetic State therapy, Predictive Value of Tests, Risk Assessment, Risk Factors, Surveys and Questionnaires, Waist Circumference, Cardiovascular Diseases etiology, Diabetes Mellitus, Type 2 diagnosis, Metabolic Syndrome diagnosis, Overweight complications, Practice Patterns, Physicians', Prediabetic State diagnosis, Primary Health Care economics
Abstract

Aims: To assess attitudes, barriers and practices of clinicians in assessing and treating cardiometabolic risk in overweight adults., Methods: In 2006, primary care physicians and mid-level practitioners in Montana were surveyed (N=430)., Results: Most primary care clinicians (95%) recognized the clinical benefit of weight loss, but many cited patient motivation (87%), lack of support services (61%), and lack of time (58%) as barriers. Over 80% identified obesity, hypertension, abnormal lipids, history of gestational diabetes, and family history as indications for diabetes screening. Most clinicians used fasting glucose (89%), random glucose (58%), and A1c (42%) as initial screens for diabetes. To confirm the diagnosis, the majority of respondents used A1c testing (80%) or fasting glucose (64%). Approximately one-quarter used the diagnosis pre-diabetes (26%), but just over half (52%) used alternative diagnoses of glucose intolerance. Sixty-five percent used the diagnosis of metabolic syndrome. Of those using metabolic syndrome, mid-level practitioners were more likely than physicians to assess waist circumference (49% vs. 63%)., Conclusions: Despite citing significant barriers, clinicians routinely assessed cardiometabolic risk with diabetes screening, but relatively few reported using the diagnosis pre-diabetes. Metabolic syndrome was used commonly to diagnose overweight adults at risk for diabetes and cardiovascular disease.

Published
2009
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