نتایج جستجو برای: microcystin

تعداد نتایج: 1507  

2016
María Ángeles Lezcano Jesús Morón-López Ramsy Agha Isabel López-Heras Leonor Nozal Antonio Quesada Rehab El-Shehawy

The microcystin biodegradation potential of a natural bacterial community coexisting with a toxic cyanobacterial bloom was investigated in a water reservoir from central Spain. The biodegradation capacity was confirmed in all samples during the bloom and an increase of mlrA gene copies was found with increasing microcystin concentrations. Among the 24 microcystin degrading strains isolated from...

2017
Robbie M Martin Stephen P Dearth Gary R LeCleir Shawn R Campagna Elizabeth M Fozo Erik R Zinser Steven W Wilhelm

Microcystins are secondary metabolites produced by several freshwater, bloom-forming cyanobacterial species. Microcystin-producing cyanobacteria co-occur with a complex community of heterotrophic bacteria. Though conflicting, studies suggest that microcystins affect the physiology of heterotrophic bacteria by inducing oxidative stress and increasing cell envelope permeability. Based on these ob...

Journal: :Applied and environmental microbiology 2009
Christopher J Allender Gary R LeCleir Johanna M Rinta-Kanto Randall L Small Michael F Satchwell Gregory L Boyer Steven W Wilhelm

While multiple phylogenetic markers have been used in the culture-independent study of microcystin-producing cyanobacteria, in only a few instances have multiple markers been studied within individual cells, and in all cases these studies have been conducted with cultured isolates. Here, we isolate and evaluate large DNA fragments (>6 kb) encompassing two genes involved in microcystin biosynthe...

Chandra Prakash, Sunil Kumar Srivastav,

Background: Previous studies have been reported on the toxicity of Microcystin-LR, which is produced by cyanobacterial growth in fish, such as Heteropneustes fossilis (H. fossilis). However, no studies have been conducted on the effects of Microcystin-LR on the prolactin cells of H. fossilis. Methods: H. fossilis fish were intraperitoneally injected with Microcystin-LR (2.5μg/25g) and sacrif...

2009
Jennifer L. Graham John R. Jones

Graham, J. L. and J. R. Jones 2009. Microcystin in Missouri reservoirs. Lake Reserv. Manage. 25:253–263. During summers (May–Aug) 2004–2006, 177 Missouri reservoirs were sampled monthly at open pelagic locations to assess regional patterns in microcystin concentration, frequency of occurrence over successive summer seasons and relations with environmental factors. Microcystin was detected in 58...

Journal: :F1000Research 2016
Jeffrey W Hollister Betty J Kreakie

Cyanobacteria harmful algal blooms (cHABs) are associated with a wide range of adverse health effects that stem mostly from the presence of cyanotoxins. To help protect against these impacts, several health advisory levels have been set for some toxins. In particular, one of the more common toxins, microcystin, has several advisory levels set for drinking water and recreational use. However, co...

Journal: :The Journal of General Physiology 1995
H C Hartzell Y Hirayama J Petit-Jacques

We previously showed (Frace, A.M. and H.C. Hartzell. 1993. Journal of Physiology. 472:305-326) that internal perfusion of frog atrial myocytes with the nonselective protein phosphatase inhibitors microcystin or okadaic acid produced an increase in the L-type Ca current (ICa) and a decrease in the delayed rectifier K current (IK). We hypothesized that microcystin revealed the activity of a prote...

2017
Pia I. Scherer Andrew D. Millard Andreas Miller Renate Schoen Uta Raeder Juergen Geist Katrin Zwirglmaier

Bacterioplankton plays an essential role in aquatic ecosystems, and cyanobacteria are an influential part of the microbiome in many water bodies. In freshwaters used for recreational activities or drinking water, toxic cyanobacteria cause concerns due to the risk of intoxication with cyanotoxins, such as microcystins. In this study, we aimed to unmask relationships between toxicity, cyanobacter...

Journal: :Applied and environmental microbiology 2011
Manabu Fujii Andrew L Rose T David Waite

Iron uptake by microcystin-producing and non-microcystin-producing strains of Microcystis aeruginosa was investigated through short-term uptake assays. Although strain-specific differences were observed, the siderophore-independent Fe uptake kinetics were essentially similar (e.g., maximum uptake rates of 2.0 to 3.3 amol·cell(-1)·h(-1)) for the wild-type toxic strain PCC7806 and a genetically e...

Journal: :Environmental monitoring and assessment 2015
Som Cit Sinang Elke S Reichwaldt Anas Ghadouani

The occurrence of cyanobacteria and microcystin is highly dynamic in natural environments and poses one of the biggest challenges to water resource management. While a number of drivers are known to be responsible for the occurrence of cyanobacterial blooms, the drivers of microcystin production are not adequately known. This study aims to quantify the effects of the changes in the structures o...

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