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Investigations into the Production a...

Liu, Dongyu.

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Investigations into the Production and Reactions of Perchlorate on Mars, Its Effects on Organic Compounds, and the Implications in the Search for Life = = 火星条件下高氯酸根的形成机理及其对有机物与微生物的影响.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigations into the Production and Reactions of Perchlorate on Mars, Its Effects on Organic Compounds, and the Implications in the Search for Life =/
其他題名:	火星条件下高氯酸根的形成机理及其对有机物与微生物的影响.
作者:	Liu, Dongyu.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	140 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
Contained By:	Dissertations Abstracts International81-12B.
標題:	Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27837297
ISBN:	9798645495435

Investigations into the Production and Reactions of Perchlorate on Mars, Its Effects on Organic Compounds, and the Implications in the Search for Life = = 火星条件下高氯酸根的形成机理及其对有机物与微生物的影响.
Liu, Dongyu.

Investigations into the Production and Reactions of Perchlorate on Mars, Its Effects on Organic Compounds, and the Implications in the Search for Life =火星条件下高氯酸根的形成机理及其对有机物与微生物的影响. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 140 p.

Source: Dissertations Abstracts International, Volume: 81-12, Section: B.

Thesis (Ph.D.)--Tufts University, 2020.

This item must not be sold to any third party vendors.

The research presented here addresses the mechanisms for photochemical formation of perchlorate (ClO4-) from sodium chlorite (ClO2-) and sodium chlorate (ClO3-) under both ambient and humid Mars conditions, the effects of chloride (Cl-) and oxychlorine salts (NaClO2, NaClO3 and NaClO4) on amino acid degradation under Mars conditions, and the critical parameters necessary for bacteria to survive in the harsh Mars environment. The perchlorate production rates from NaClO2, NaClO3 were measured. Titanium dioxide (TiO2) was added to the sample to evaluate its role in perchlorate production. The effects of humidity and UV radiation wavelength on perchlorate production were compared. The chemical changes during perchlorate formation were quantitively analyzed with ion chromatography to help better understand the reaction pathways. The degradation of three amino acids (glycine, proline and tryptophan) under Mars conditions were studied. A degradation mechanism for glycine and proline was proposed to explain the opposite effects the salts have under ambient Mars and humid Mars conditions. It was also demonstrated that tryptophan degradation under Mars conditions followed a different mechanism due to the indole ring present compared to glycine and proline. Preliminary studies on the ability of E. coli, and Eucapsis sp. to survive on Mars were carried out, varying parameters such as salinity and nutrients. Additionally, the effects of three different Mars soil simulants (MMS-1 F, MGS-1 and JSC-Mars-1A) on bacterial growth were investigated, with MMS-1 F soil leachate found to be the most suitable for Eucapsis growth. Culturing conditions and analytical methods were optimized for the bacteria studied.

ISBN: 9798645495435Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Amino acid degradation

Investigations into the Production and Reactions of Perchlorate on Mars, Its Effects on Organic Compounds, and the Implications in the Search for Life = = 火星条件下高氯酸根的形成机理及其对有机物与微生物的影响.
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245 1 0 $a Investigations into the Production and Reactions of Perchlorate on Mars, Its Effects on Organic Compounds, and the Implications in the Search for Life = $b 火星条件下高氯酸根的形成机理及其对有机物与微生物的影响.
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506 $a This item must not be sold to any third party vendors.
520 $a The research presented here addresses the mechanisms for photochemical formation of perchlorate (ClO4-) from sodium chlorite (ClO2-) and sodium chlorate (ClO3-) under both ambient and humid Mars conditions, the effects of chloride (Cl-) and oxychlorine salts (NaClO2, NaClO3 and NaClO4) on amino acid degradation under Mars conditions, and the critical parameters necessary for bacteria to survive in the harsh Mars environment. The perchlorate production rates from NaClO2, NaClO3 were measured. Titanium dioxide (TiO2) was added to the sample to evaluate its role in perchlorate production. The effects of humidity and UV radiation wavelength on perchlorate production were compared. The chemical changes during perchlorate formation were quantitively analyzed with ion chromatography to help better understand the reaction pathways. The degradation of three amino acids (glycine, proline and tryptophan) under Mars conditions were studied. A degradation mechanism for glycine and proline was proposed to explain the opposite effects the salts have under ambient Mars and humid Mars conditions. It was also demonstrated that tryptophan degradation under Mars conditions followed a different mechanism due to the indole ring present compared to glycine and proline. Preliminary studies on the ability of E. coli, and Eucapsis sp. to survive on Mars were carried out, varying parameters such as salinity and nutrients. Additionally, the effects of three different Mars soil simulants (MMS-1 F, MGS-1 and JSC-Mars-1A) on bacterial growth were investigated, with MMS-1 F soil leachate found to be the most suitable for Eucapsis growth. Culturing conditions and analytical methods were optimized for the bacteria studied.
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