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Ground water

ABSTRACT: Ground water Raw sequence reads

PROVIDER: PRJNA1059800 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR27396900_1.fastq.gz	Fastqsanger.gz
	SRR27396900_2.fastq.gz	Fastqsanger.gz
	SRR27396901_1.fastq.gz	Fastqsanger.gz
	SRR27396901_2.fastq.gz	Fastqsanger.gz
	SRR27396897_1.fastq.gz	Fastqsanger.gz

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2011-06-23 | GSE30163 | GEO

Assessment of chemical mixtures and ground water effects on Daphnia magna transcriptomics

Project description:Small organisms can be used as biomonitoring tools to assess chemicals in the environment. Chemical stressors are especially hard to assess and monitor when present as complex mixtures. Here, Daphnia magna were exposed for 24 hours to five different munitions constituents 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (2,4-DNT), 2,6-dinitrotoluene (2,6-DNT), trinitrobenzene (TNB), dinitrobenzene (DNB), or 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) as well as to 8 different munitions mixtures and ground water contaminated with munitions constituents. To better understand possible mixture effects, gene expression changes from all treatments were compared using high-density microarrays. While mixtures and ground water exposures had genes and gene functions in common with single chemical exposures, unique functions were also affected, which was consistent with the non-additivity of chemical effects in these mixtures. The study consisted of three different experiments: (1) exposure to a concentration corresponding to 70% of 1/10th of the LC50 value of six individual MCs (TNT, 2,4-DNT, 2,6-DNT, DNB, TNB, RDX) and a control; (2) exposure to eight different laboratory mixtures of the previously mentioned MCs. Different combinations of MCs including four mixtures (Mixtures 5, 6, 7 and 8) representative of field collected groundwater from LAAP (Louisiana Army Ammunition Plant) were created; and (3) exposure to MC-contaminated ground water field-collected from 3 different wells (85, 108, and 141) at the LAAP. All exposures were conducted for 24h.

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Suppression of neurons in circumventricular organs enables months-long survival without water in thirteen-lined ground squirrels

Project description:Water deprivation is a life-threatening condition that engages a protective physiological response to couple osmolyte retention with potentiation of thirst. This response, typical for most mammals, safeguards against short-term water deprivation, but fails in the long-term. Thirteen-lined ground squirrels (Ictidomys tridecemlineatus) employ the short-term response during summer, whereas during winter they lack thirst and survive without water for months. Here, we show that long-term thirst suppression occurs despite hormonal and behavioral signs of a dramatic fluid deficit and originates from hypoactivity of neurons in the circumventricular organs, which exhibit marked functional suppression during winter that blunts their sensitivity to thirst cues. Our work reveals a remarkable capacity of the evolutionarily conserved brain regions which control fluid homeostasis in mammals to enable long-term survival without water.

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