Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin
2017 Summer. Includes bibliographical references. Accurate interpretations of environmental change throughout Earth's history rely on robust correlations of sedimentary systems. The Late Jurassic has been difficult to correlate regionally and globally due to sparse radiometric ages and lack of...
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ftcolostateunidc:oai:mountainscholar.org:10217/183931 2023-06-11T04:17:12+02:00 Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin Connors, Marisa Leigh Hannah, Judith Stein, Holly Borch, Thomas Hammer, Øyvind 2017-09-14T16:04:49Z born digital masters theses application/pdf https://hdl.handle.net/10217/183931 English eng eng Colorado State University. Libraries 2000-2019 - CSU Theses and Dissertations Connors_colostate_0053N_14298.pdf https://hdl.handle.net/10217/183931 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. Text 2017 ftcolostateunidc 2023-05-04T17:40:55Z 2017 Summer. Includes bibliographical references. Accurate interpretations of environmental change throughout Earth's history rely on robust correlations of sedimentary systems. The Late Jurassic has been difficult to correlate regionally and globally due to sparse radiometric ages and lack of cosmopolitan fossils. The rhenium-osmium (Re-Os) geochronometer provides an excellent platform to approach this problem. Re-Os geochemistry provides a way to directly date organic-rich shales which can then be used to: 1) place numerical ages on boreal fossil zones and Geologic Time Scale stage boundaries, 2) correlate with regional or global units, and 3) enhance the understanding of oceanic anoxic events (OAEs) and climactic shifts when paired with additional chemical and lithological data. The Agardhfjellet Formation of Svalbard, Norway has multiple intervals of organic-rich mudrocks which are ideal for Re-Os geochemistry. Presented here are Re-Os ages which confirm placement of the Agardhfjellet Formation within the Late Jurassic to Early Cretaceous (157.9 ± 2.9 Ma to 141 ± 20 Ma). We provide an age immediately above the Kimmeridgian-Oxfordian boundary, within the Amoebocera subkitchini zone, at 153.2 ± 5.0 Ma in agreement with previous work. Furthermore we present evidence that: (1) the Agardhfjellet Formation was deposited in fluctuating anoxia conditions; (2) increasing initial 187Os/188Os (0.401±0.007 to 0.577±0.054) coupled with a decrease in δ13Corg (-25.26‰ to -29.63‰) through the Late Jurassic signifies a changing climate represented by an increase continental weathering with a warming climate and/or an increase in continental freeboard. Text Svalbard Digital Collections of Colorado (Colorado State University) Agardhfjellet ENVELOPE(18.833,18.833,78.083,78.083) Norway Svalbard |
institution |
Open Polar |
collection |
Digital Collections of Colorado (Colorado State University) |
op_collection_id |
ftcolostateunidc |
language |
English |
description |
2017 Summer. Includes bibliographical references. Accurate interpretations of environmental change throughout Earth's history rely on robust correlations of sedimentary systems. The Late Jurassic has been difficult to correlate regionally and globally due to sparse radiometric ages and lack of cosmopolitan fossils. The rhenium-osmium (Re-Os) geochronometer provides an excellent platform to approach this problem. Re-Os geochemistry provides a way to directly date organic-rich shales which can then be used to: 1) place numerical ages on boreal fossil zones and Geologic Time Scale stage boundaries, 2) correlate with regional or global units, and 3) enhance the understanding of oceanic anoxic events (OAEs) and climactic shifts when paired with additional chemical and lithological data. The Agardhfjellet Formation of Svalbard, Norway has multiple intervals of organic-rich mudrocks which are ideal for Re-Os geochemistry. Presented here are Re-Os ages which confirm placement of the Agardhfjellet Formation within the Late Jurassic to Early Cretaceous (157.9 ± 2.9 Ma to 141 ± 20 Ma). We provide an age immediately above the Kimmeridgian-Oxfordian boundary, within the Amoebocera subkitchini zone, at 153.2 ± 5.0 Ma in agreement with previous work. Furthermore we present evidence that: (1) the Agardhfjellet Formation was deposited in fluctuating anoxia conditions; (2) increasing initial 187Os/188Os (0.401±0.007 to 0.577±0.054) coupled with a decrease in δ13Corg (-25.26‰ to -29.63‰) through the Late Jurassic signifies a changing climate represented by an increase continental weathering with a warming climate and/or an increase in continental freeboard. |
author2 |
Hannah, Judith Stein, Holly Borch, Thomas Hammer, Øyvind |
format |
Text |
author |
Connors, Marisa Leigh |
spellingShingle |
Connors, Marisa Leigh Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin |
author_facet |
Connors, Marisa Leigh |
author_sort |
Connors, Marisa Leigh |
title |
Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin |
title_short |
Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin |
title_full |
Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin |
title_fullStr |
Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin |
title_full_unstemmed |
Metabolic engineering of the cyanobacterium Synechocystis sp. PCC 6803 for the production of astaxanthin |
title_sort |
metabolic engineering of the cyanobacterium synechocystis sp. pcc 6803 for the production of astaxanthin |
publisher |
Colorado State University. Libraries |
publishDate |
2017 |
url |
https://hdl.handle.net/10217/183931 |
long_lat |
ENVELOPE(18.833,18.833,78.083,78.083) |
geographic |
Agardhfjellet Norway Svalbard |
geographic_facet |
Agardhfjellet Norway Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
2000-2019 - CSU Theses and Dissertations Connors_colostate_0053N_14298.pdf https://hdl.handle.net/10217/183931 |
op_rights |
Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. |
_version_ |
1768376129475837952 |