�ber die Ultrastruktur des ?Nervus opticus? und des Ganglion opticum I von Daphnia pulex

1970 ◽  
Vol 103 (4) ◽  
pp. 526-543 ◽  
Author(s):  
J. R. Wolff ◽  
F. -H. G�ldner
Keyword(s):  
Daphnia Pulex ◽  
Nervus Opticus

The effects of contaminated sediments of the Blesbok Spruit near Witbank on water quality and the toxicity thereof to Daphnia pulex

1999 ◽  
Vol 39 (10-11) ◽  
pp. 173-176 ◽  
Author(s):  
Liesl Hill ◽  
Sebastian Jooste
Keyword(s):  
Surface Water ◽  
Mine Drainage ◽  
Interstitial Water ◽  
Stream Water ◽  
Daphnia Pulex ◽  
Contaminated Sediments ◽  
Toxicity Tests ◽  
Major Route ◽  
Acute Toxicity Tests ◽  
Route Of Exposure

With the increasing focus on environmental issues, the objective of this study is to evaluate the potential impact of contaminated sediments of the Blesbok Spruit near Witbank - which receives acid mine drainage (AMD) inter alia - on biota. Direct transfer of chemicals from sediments to organisms is considered to be a major route of exposure for many species, and therefore focusing attention on sediment contamination and highlighting the fact that sediments are an important resource. Acute toxicity tests were performed on Daphnia pulex using both extracted sediment interstitial water and surface water. Chemical analyses were also performed on the sediment, interstitial water and surface water samples. The toxicity results suggest that metal toxicity adds significantly to the toxicity of the stream water which is enhanced by the effect of pH. The pH of the stream and interstitial water was consistently below 4.5.

Cloning and expression of the lifespan-associated protein Sir2 from Daphnia pulex

2019 ◽  
Vol 231 ◽  
pp. 1-10 ◽  
Author(s):  
Chongyuan Lin ◽  
Mengdi Liu ◽  
Xiaojing Zhu ◽  
Mengmeng Zhang ◽  
Shanliang Xu ◽  
...  
Keyword(s):  
Daphnia Pulex ◽  
Cloning And Expression

Long-term changes in morphological traits of Daphnia pulex in Lake Fukami-ike, Japan

Limnology ◽  
2021 ◽  
Author(s):  
Yurie Otake ◽  
Hajime Ohtsuki ◽  
Jotaro Urabe ◽  
Kazuyoshi Yamada ◽  
Takehito Yoshida
Keyword(s):  
Morphological Traits ◽  
Daphnia Pulex ◽  
Long Term Changes

scholarly journals Metabolic adjustments during starvation in Daphnia pulex

2021 ◽  
pp. 110591
Author(s):  
Eva Klumpen ◽  
Nadine Hoffschröer ◽  
Andrea Schwalb ◽  
Ulrike Gigengack ◽  
Marita Koch ◽  
...  
Keyword(s):  
Daphnia Pulex

scholarly journals Mode of action evaluation for reduced reproduction in Daphnia pulex exposed to the insensitive munition, 1-methyl-3-nitro-1-nitroguanidine (MeNQ)

Ecotoxicology ◽  
2021 ◽  
Author(s):  
Kurt A. Gust ◽  
Guilherme R. Lotufo ◽  
Natalie D. Barker ◽  
Qing Ji ◽  
Lauren K. May
Keyword(s):  
Egg Production ◽  
Daphnia Pulex ◽  
Indirect Costs ◽  
Energy Budgets ◽  
Exposure Level ◽  
Transcriptional Expression ◽  
Canonical Pathways ◽  
Significant Enrichment ◽  
Inducible Protein ◽  
Reproductive Processes

AbstractThe US Department of Defense (DOD) is developing insensitive munitions (IMs) that are resistant to unintended detonation to protect warfighters. To enable material life-cycle analysis for the IM, 1-methyl-3-nitro-1-nitroguanidine (MeNQ), ecotoxicological impacts assessment was required. A previous investigation of MeNQ exposures in Daphnia pulex revealed concentration-responsive decreases in reproduction relative to controls (0 mg/L) across a 174, 346, 709, 1385, and 2286 mg/L exposure range. The present study used those exposures to conduct global transcriptomic expression analyses to establish hypothetical mode(s) of action underlying inhibited reproduction. The number of significantly affected transcripts and the magnitude of fold-change differences relative to controls tended to increase with increasing MeNQ concentration where hierarchical clustering analysis identified separation among the “low” (174 and 346 mg/L) and “high” (709, 1385, and 2286 mg/L) exposures. Vitellogenin is critical to Daphnia reproductive processes and MeNQ exposures significantly decreased transcriptional expression for vitellogenin-1 precursor at the lowest exposure level (174 mg/L) with benchmark dose (BMD) levels closely tracking concentrations that caused inhibited reproduction. Additionally, juvenile hormone-inducible protein, chorion peroxidase, and high choriolytic enzyme transcriptional expression were impacted by MeNQ exposure having potential implications for egg production / maturation and overall fecundity. In concert with these effects on specific genes involved in Daphnia reproductive physiology, MeNQ exposures caused significant enrichment of several canonical-pathways responsible for metabolism of cellular energy substrates where BMD levels for transcriptional expression were observed at ≤100 mg/L. These observations imply possible effects on whole-organism energy budgets that may also incur indirect costs on reproduction.

scholarly journals Genetic Diversity of Daphnia pulex in the Middle and Lower Reaches of the Yangtze River

PLoS ONE ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. e0152436 ◽  
Author(s):  
Wenping Wang ◽  
Kun Zhang ◽  
Daogui Deng ◽  
Ya-Nan Zhang ◽  
Shuixiu Peng ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Yangtze River ◽  
Daphnia Pulex ◽  
The Yangtze River

scholarly journals The cytochrome P450 (CYP) gene superfamily in Daphnia pulex

BMC Genomics ◽  
2009 ◽  
Vol 10 (1) ◽  
pp. 169 ◽  
Author(s):  
William S Baldwin ◽  
Peter B Marko ◽  
David R Nelson
Keyword(s):  
Cytochrome P450 ◽  
Daphnia Pulex
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