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Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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1

Cheng, Xiaoliang, Honglan Shi, Craig D. Adams, Terry Timmons i Yinfa Ma. "Effects of oxidative and physical treatments on inactivation of Cylindrospermopsis raciborskii and removal of cylindrospermopsin". Water Science and Technology 60, nr 3 (1.07.2009): 689–97. http://dx.doi.org/10.2166/wst.2009.385.

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The presence of toxic cyanobacterial blooms (or blue-green algae) in water bodies used either as drinking water or for recreational purposes may present serious health risks for the human population. In this study, the removal of the chemical toxin, cylindrospermopsin, via free chlorine, chlorine dioxide, monochloramine, permanganate, ozone, and UV irradiation was studied. Ozone and free chlorine were found to be highly effective for cylindrospermopsion removal while the other disinfectants were ineffective. Ozone and free chlorine were also determined to be highly effective for the inactivation of the cyanobacteria, Cylindrospermopsis raciborskii, at typical water treatment exposures, chlorine dioxide, monochloramine, and permanganate were only marginally effective at inactivation of Cylindrospermopsis raciborskii.
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2

Fonseca, A. L., J. Da Silva, E. A. Nunes, S. M. F. O. Azevedo i R. M. Soares. "In vivo genotoxicity of treated water containing the cylindrospermopsin-producer Cylindrospermopsis raciborskii". Journal of Water and Health 12, nr 3 (19.03.2014): 474–83. http://dx.doi.org/10.2166/wh.2014.087.

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Cylindrospermopsin (CYN) is an alkaloid commonly produced by some cyanobacteria that has been implicated in outbreaks of human illness. The aim of this study was to investigate the genotoxicity of Cylindrospermopsis raciborskii cellular content (including CYN) and its byproducts resulting from chlorination during water treatment. DNA damage in blood and liver cells was analysed by the comet assay and micronucleus test (MN). Mice were injected intraperitoneally with the following treatments: (a) physiological saline, (b) treated water, (c) treated water plus C. raciborskii extract (CYN producer strain, CYPO-011 K), (d) C. raciborskii extract (CYN producer strain, CYPO-011 K), (e) C. raciborskii extract (CYN non producer strain), and (f) treated water plus C. raciborskii extract (CYN non producer strain) extract. After 48 h, samples were taken to perform tests (blood and liver cells to the comet assay and bone marrow to MN test). The CYPO-011 K had a genotoxic and mutagenic effects on liver and bone marrow cells. The group that received chlorine-treated water plus CYPO-011 K also exhibited genotoxic effects in the liver, as well as in the blood, and a mutagenic effect in blood marrow cells. The results emphasise the need of improving CYN monitoring in waters bodies in order to reduce the risk of human exposure.
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3

Saker, Martin L., i Dilwyn J. Griffiths. "Occurrence of blooms of the cyanobacterium Cylindrospermopsis raciborskii (Woloszynska) Seenayya and Subba Raju in a north Queensland domestic water supply". Marine and Freshwater Research 52, nr 6 (2001): 907. http://dx.doi.org/10.1071/mf00110.

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This paper describes seasonally recurring blooms of the potentially toxic cyanobacterium Cylindrospermopsis raciborskii in relation to some limnological characteristics of Lake Julius, a large man-made water impoundment in Australia’s semi-arid tropics. These blooms have occurred each year since 1991, with subsurface concentrations of >50 000 cells mL–1. Periods of greater cyanobacterial abundance are characterized by reduced rates of vertical mixing of the water column, reduced mixed:euphotic depth ratios and high epilimnetic temperatures (>25˚C). Surface scums were not observed and, in general, this species displays a fairly uniform distribution throughout the euphotic zone and below. An isolate of C. raciborskii taken from Lake Julius during a bloom in November 1995 and grown in pure culture produced no symptoms of poisoning when tested by mouse bioassay, and absence of detectable concentrations of the hepatotoxin cylindrospermopsin was confirmed by HPLC/MS-MS. Low concentrations of cylindrospermopsin (~1–2 g L–1) were detected in the lake during blooms of C. raciborskii.
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4

Costa, I. A. S., S. M. F. O. Azevedo, P. A. C. Senna, R. R. Bernardo, S. M. Costa i N. T. Chellappa. "Occurrence of toxin-producing cyanobacteria blooms in a Brazilian semiarid reservoir". Brazilian Journal of Biology 66, nr 1b (luty 2006): 211–19. http://dx.doi.org/10.1590/s1519-69842006000200005.

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We report the occurrence of cyanobacterial blooms and the presence of cyanotoxins in water samples from the Armando Ribeiro Gonçalves reservoir (06° 08’ S and 37° 07’ W), located in the state of Rio Grande do Norte, in the semiarid region of northeastern Brazil. The cyanobacterial species were identified and quantified during the rainy and dry seasons in the year 2000. Cyanotoxins such as microcystins, saxitoxins and cylindrospermopsins were analyzed and quantified using HPLC and ELISA methods. The mixed toxic blooms of Cylindrospermopsis raciborskii, Microcystis spp (M. panniformis, M. protocystis, M. novacekii) and Aphanizomenon spp (Aphanizomenon gracile, A. cf. manguinii, A. cf. issastschenkoi) were persistent and represented 90-100% of the total phytoplankton species. Toxic cyanobacterial blooms from the Armando Ribeiro Gonçalves reservoir were analyzed and found to have three phases in relation to the annual cycle. During the rainy season, an intense toxic bloom of Cylindrospermopsis raciborskii was recorded along with saxitoxins (3.14 µg.L-1). During the transition period, between the rainy and dry seasons, different species of Microscytis occurred and microcystin as high as 8.8 µg.L-1 was recorded. In the dry season, co-dominance of Cylindrospermopsis raciborskii, Microcystis spp and Aphanizomenon spp occurred and the concentrations of saxitoxin remained very low. Our results indicate the presence of microcystins (8.8 µg.L-1) and saxitoxins (3.14 µg.L-1) into the crude water, with increasing concentrations from the second fortnight of April to late May 2000. The occurrence of toxic blooms in this reservoir points to a permanent risk of cyanotoxins in supply waters, indicating the need for the implementation of bloom control measures to improve the water quality. Exposure of the local population to cyanotoxins through their potential accumulation in fish muscle must also be considered.
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5

Dyble, Julianne, Hans W. Paerl i Brett A. Neilan. "Genetic Characterization of Cylindrospermopsis raciborskii (Cyanobacteria) Isolates from Diverse Geographic Origins Based on nifH and cpcBA-IGS Nucleotide Sequence Analysis". Applied and Environmental Microbiology 68, nr 5 (maj 2002): 2567–71. http://dx.doi.org/10.1128/aem.68.5.2567-2571.2002.

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ABSTRACT Isolates of the toxic, N2-fixing species Cylindrospermopsis raciborskii from various geographic locations were analyzed with respect to their genetic diversity based on the nifH and cpcBA-IGS genes. Gene sequences clustered according to their geographic origin, with the nifH sequences separating into European, Australian, and American groups and the cpcBA-IGS sequences separating into American and European or Australian groups. PCR primers for both genes were designed to exclusively amplify DNA from Cylindrospermopsis species, and an additional primer set for cpcBA-IGS was designed to specifically amplify the American C. raciborskii strains.
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6

Ohtani, Ikuko, Richard E. Moore i Maria T. C. Runnegar. "Cylindrospermopsin: a potent hepatotoxin from the blue-green alga Cylindrospermopsis raciborskii". Journal of the American Chemical Society 114, nr 20 (wrzesień 1992): 7941–42. http://dx.doi.org/10.1021/ja00046a067.

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7

Senogles, P., G. Shaw, M. Smith, R. Norris, R. Chiswell, J. Mueller, R. Sadler i G. Eaglesham. "Degradation of the cyanobacterial toxin cylindrospermopsin, from Cylindrospermopsis raciborskii, by chlorination". Toxicon 38, nr 9 (wrzesień 2000): 1203–13. http://dx.doi.org/10.1016/s0041-0101(99)00210-x.

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8

Bakheet, Belal, Md Ashraful Islam, John Beardall, Xiwang Zhang i David McCarthy. "Electrochemical inactivation of Cylindrospermopsis raciborskii and removal of the cyanotoxin cylindrospermopsin". Journal of Hazardous Materials 344 (luty 2018): 241–48. http://dx.doi.org/10.1016/j.jhazmat.2017.10.024.

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9

FUJIMOTO, NAOSHI, SAYAKA KONNO, YUKI YOSHINO, AKIHIRO OHNISHI, MASAHARU SUZUKI, MOTOYUKI MIZUOCHI i YUHEI INAMORI. "Production of hepatotoxin cylindrospermopsin in the batch culture of cyanobacterium Cylindrospermopsis raciborskii". Japanese Journal of Water Treatment Biology 41, nr 3 (2005): 153–58. http://dx.doi.org/10.2521/jswtb.41.153.

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10

Hoff-Risseti, Caroline, Felipe Augusto Dörr, Patricia Dayane Carvalho Schaker, Ernani Pinto, Vera Regina Werner i Marli Fatima Fiore. "Cylindrospermopsin and Saxitoxin Synthetase Genes in Cylindrospermopsis raciborskii Strains from Brazilian Freshwater". PLoS ONE 8, nr 8 (28.08.2013): e74238. http://dx.doi.org/10.1371/journal.pone.0074238.

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11

Kinnear, S. H. W., L. J. Duivenvoorden i L. D. Fabbro. "Sublethal responses in Melanoides tuberculata following exposure to Cylindrospermopsis raciborskii containing cylindrospermopsin". Harmful Algae 6, nr 5 (październik 2007): 642–50. http://dx.doi.org/10.1016/j.hal.2007.01.004.

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12

Pierangelini, Mattia, Rati Sinha, Anusuya Willis, Michele A. Burford, Philip T. Orr, John Beardall i Brett A. Neilan. "Constitutive Cylindrospermopsin Pool Size in Cylindrospermopsis raciborskii under Different Light and CO2Partial Pressure Conditions". Applied and Environmental Microbiology 81, nr 9 (27.02.2015): 3069–76. http://dx.doi.org/10.1128/aem.03556-14.

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ABSTRACTCylindrospermopsin (CYN) and 7-deoxy-cylindrospermopsin (dCYN) are potent hepatotoxic alkaloids produced by numerous species of cyanobacteria, including the freshwaterCylindrospermopsis raciborskii.C. raciborskiiis an invasive cyanobacterium, and the study of how environmental parameters drive CYN production has received significant interest from water managers and health authorities. Light and CO2affect cell growth and physiology in photoautotrophs, and these are potential regulators of cyanotoxin biosynthesis. In this study, we investigated how light and CO2affect CYN and dCYN pool size as well as the expression of the key genes,cyrAandcyrK, involved in CYN biosynthesis in a toxicC. raciborskiistrain. For cells growing at different light intensities (10 and 100 μmol photons m−2s−1), we observed that the rate of CYN pool size production (μCYN) was coupled to the cell division rate (μc) during batch culture. This indicated that CYN pool size under our experimental conditions is constant and cell quotas of CYN (QCYN) and dCYN (QdCYN) are fixed. Moreover, a lack of correlation between expression ofcyrAand total CYN cell quotas (QCYNs) suggests that the CYN biosynthesis is regulated posttranscriptionally. Under elevated CO2(1,300 ppm), we observed minor effects on QCYNand no effects on expression ofcyrAandcyrK. We conclude that the CYN pool size is constitutive and not affected by light and CO2conditions. Thus,C. raciborskiibloom toxicity is determined by the absolute abundance ofC. raciborskiicells within the water column and the relative abundance of toxic and nontoxic strains.
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13

Gemelgo, Marcina C. P., Célia L. Sant'Anna, Andréa Tucci i Heloiza R. Barbosa. "Population dynamics of Cylindrospermopsis raciborskii (Woloszynska) Seenayya & Subba Raju, a Cyanobacteria toxic species, in watersupply reservoirs in São Paulo, Brazil". Hoehnea 35, nr 2 (czerwiec 2008): 297–307. http://dx.doi.org/10.1590/s2236-89062008000200011.

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The Guarapiranga and Billings reservoirs are main sources of public water supply to millions of people in the city of São Paulo, Brazil. They have been under intense antropic action as a result of domestic, industrial, farm and livestock waste being dumped in the reservoirs. Cyanobacteria develop very well in such an environment, producing blooms that are most often toxic. Cylindrospermopsis raciborskii(Woloszynska) Seenayya & Subba Raju is a toxic species which is rapidly spreading all over the world and is abundant in the studied reservoirs. The goal of the study was to follow the year-round variation of the C. raciborskii population density and to correlate it with selected environmental factors. Samples were collected monthly on the surface of the water column and studied under a binocular optic microscope, whereas quantitative studies were carried out under an inverted microscope, according to the Utermöhl method. Among the phytoplankton community, organisms of the Cyanobacteria Class were represented by the greatest population density (cells mL-1). Cylindrospermopsis raciborskii was one of the abundant species in the Billings reservoir, both in the dry and rainy season. The principal environmental factors that influenced C. raciborskii population dynamics were water temperature, high pH values and low euphotic zone values
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14

Engström-Öst, Jonna, Ivana Savatijevic Rasic, Andreas Brutemark, Romi Rancken, Gordana Subakov Simić i Ane T. Laugen. "Can Cylindrospermopsis raciborskii invade the Baltic Sea?" Environmental Reviews 23, nr 2 (czerwiec 2015): 161–69. http://dx.doi.org/10.1139/er-2014-0062.

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Management actions against invasive species are usually most efficient during early stages of invasion. Monitoring for early detection is therefore part of many management plans. However, if monitoring efforts do not match suitable habitat areas, detecting the initial stages of an invasion may fail. We highlight this mismatch by assessing which areas have suitable habitats for an invasion of the cyanobacterium Cylindrospermopsis raciborskii in the Baltic Sea, and compare these with the areas that are currently monitored for algal blooms. Establishment of this potential toxin-producer in the Baltic Sea could have serious socio-economic consequences for tourism and recreation, as well as fisheries and aquaculture in the coastal regions. We estimate the coastal areas of the eastern Gulf of Finland as the most suitable area for establishment because of low salinity and high summer seawater surface temperatures. The species is not yet reported in the Baltic Sea, but in the suitable-habitat areas indicated by our assessment, very little monitoring is currently being done. We suggest several lines of research and monitoring to increase the probability of early detection and better predictions for the future distribution of the species.
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15

Neilan, B. A., M. L. Saker, J. Fastner, A. Törökné i B. P. Burns. "Phylogeography of the invasive cyanobacterium Cylindrospermopsis raciborskii". Molecular Ecology 12, nr 1 (19.12.2002): 133–40. http://dx.doi.org/10.1046/j.1365-294x.2003.01709.x.

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16

Mihali, Troco Kaan, Ralf Kellmann, Julia Muenchhoff, Kevin D. Barrow i Brett A. Neilan. "Characterization of the Gene Cluster Responsible for Cylindrospermopsin Biosynthesis". Applied and Environmental Microbiology 74, nr 3 (7.12.2007): 716–22. http://dx.doi.org/10.1128/aem.01988-07.

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ABSTRACT Toxic cyanobacterial blooms cause economic losses and pose significant public health threats on a global scale. Characterization of the gene cluster for the biosynthesis of the cyanobacterial toxin cylindrospermopsin (cyr) in Cylindrospermopsis raciborskii AWT205 is described, and the complete biosynthetic pathway is proposed. The cyr gene cluster spans 43 kb and is comprised of 15 open reading frames containing genes required for the biosynthesis, regulation, and export of the toxin. Biosynthesis is initiated via an amidinotransfer onto glycine followed by five polyketide extensions and subsequent reductions, and rings are formed via Michael additions in a stepwise manner. The uracil ring is formed by a novel pyrimidine biosynthesis mechanism and tailoring reactions, including sulfation and hydroxylation that complete biosynthesis. These findings enable the design of toxic strain-specific probes and allow the future study of the regulation and biological role of cylindrospermopsin.
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Venegas, Judith, Pablo Castillejo Pons, Susana Chamorro, Ivonne Carrillo i Eduardo Lobo. "Characterization and spatio-temporal dynamics of Cylindrospermopsis raciborski in an Amazonian Lagoon, Ecuador." Enfoque UTE 9, nr 2 (29.06.2018): 117–24. http://dx.doi.org/10.29019/enfoqueute.v9n2.195.

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The cyanobacteria Cylindrospermopsis raciborskii, is a fresh water ubiquitous species from tropical to temperate weather. It is potentially capable of producing toxins. Thus it is necessary to monitor its presence in fresh waters associated to recreational use activities and human consumption. There are official reports and one thesis reporting the presence of C. raciborskii in Ecuador. Nevertheless, this country does not appear in the latest distribution maps of this species in the scientific literature. In this article, we report the presence of C. raciborskii in Ecuador, together with the characterization of the environmental conditions of one of the habitats where this species is present: the Limoncocha lagoon, province of Sucumbíos.
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18

Mazmouz, Rabia, Florence Chapuis-Hugon, St�phane Mann, Val�rie Pichon, Annick M�jean i Olivier Ploux. "Biosynthesis of Cylindrospermopsin and 7-Epicylindrospermopsin in Oscillatoria sp. Strain PCC 6506: Identification of the cyr Gene Cluster and Toxin Analysis". Applied and Environmental Microbiology 76, nr 15 (4.06.2010): 4943–49. http://dx.doi.org/10.1128/aem.00717-10.

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ABSTRACT Cylindrospermopsin is a cytotoxin produced by Cylindrospermopsis raciborskii and other cyanobacteria that has been implicated in human intoxications. We report here the complete sequence of the gene cluster responsible for the biosynthesis of this toxin in Oscillatoria sp. strain PCC 6506. This cluster of genes was found to be homologous with that of C. raciborskii but with a different gene organization. Using an enzyme-linked immunosorbent assay and an optimized liquid chromatography analytical method coupled to tandem mass spectrometry, we detected 7-epicylindrospermopsin, cylindrospermopsin, and 7-deoxycylindrospermopsin in the culture medium of axenic Oscillatoria PCC 6506 at the following relative concentrations: 68.6%, 30.2%, and 1.2%, respectively. We measured the intracellular and extracellular concentrations, per mg of dried cells of Oscillatoria PCC 6506, of 7-epicylindrospermopsin (0.18 μg/mg and 0.29 μg/mg, respectively) and cylindrospermopsin (0.10 μg/mg and 0.11 μg/mg, respectively). We showed that these two toxins accumulated in the culture medium of Oscillatoria PCC 6506 but that the ratio (2.5 � 0.3) was constant with 7-epicylindrospermopsin being the major metabolite. We also determined the concentrations of these toxins in culture media of other Oscillatoria strains, PCC 6407, PCC 6602, PCC 7926, and PCC 10702, and found that, except for PCC 6602, they all produced 7-epicylindrospermopsin and cylindrospermopsin, with the former being the major toxin, except for PCC 7926, which produced very little 7-epicylindrospermopsin. All the cylindrospermopsin producers studied gave a PCR product using specific primers for the amplification of the cyrJ gene from genomic DNA.
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19

Wilson, Kim M., Mark A. Schembri, Peter D. Baker i Christopher P. Saint. "Molecular Characterization of the Toxic Cyanobacterium Cylindrospermopsis raciborskii and Design of a Species-Specific PCR". Applied and Environmental Microbiology 66, nr 1 (1.01.2000): 332–38. http://dx.doi.org/10.1128/aem.66.1.332-338.2000.

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ABSTRACT Cylindrospermopsis raciborskii is a toxic-bloom-forming cyanobacterium that is commonly found in tropical to subtropical climatic regions worldwide, but it is also recognized as a common component of cyanobacterial communities in temperate climates. Genetic profiles of C. raciborskii were examined in 19 cultured isolates originating from geographically diverse regions of Australia and represented by two distinct morphotypes. A 609-bp region of rpoC1, a DNA-dependent RNA polymerase gene, was amplified by PCR from these isolates with cyanobacterium-specific primers. Sequence analysis revealed that all isolates belonged to the same species, including morphotypes with straight or coiled trichomes. Additional rpoC1 gene sequences obtained for a range of cyanobacteria highlighted clustering of C. raciborskii with other heterocyst-producing cyanobacteria (orders Nostocales andStigonematales). In contrast, randomly amplified polymorphic DNA and short tandemly repeated repetitive sequence profiles revealed a greater level of genetic heterogeneity amongC. raciborskii isolates than did rpoC1 gene analysis, and unique band profiles were also found among each of the cyanobacterial genera examined. A PCR test targeting a region of therpoC1 gene unique to C. raciborskii was developed for the specific identification of C. raciborskiifrom both purified genomic DNA and environmental samples. The PCR was evaluated with a number of cyanobacterial isolates, but a PCR-positive result was only achieved with C. raciborskii. This method provides an accurate alternative to traditional morphological identification of C. raciborskii.
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OHTANI, I., R. E. MOORE i M. T. C. RUNNEGAR. "ChemInform Abstract: Cylindrospermopsin: A Potent Hepatotoxin from the Blue-Green Alga Cylindrospermopsis raciborskii". ChemInform 24, nr 3 (21.08.2010): no. http://dx.doi.org/10.1002/chin.199303263.

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Cvijan, M., i Sanja Fuzinato. "The first finding of Cylindrospermopsis raciborskii (Woloszińska) Seenayya et Subba Raju, 1972 (Cyanoprokaryota) in Serbia". Archives of Biological Sciences 63, nr 2 (2011): 507–10. http://dx.doi.org/10.2298/abs1102507c.

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Within the framework of a detailed survey of the algal community in the salt marshes of the Vojvodina Province (northern Serbia), we found Cylindrospermopsis raciborskii (Woloszi?ska) Seenayya et Subba Raju in water samples from Slatina Pond near Opovo. This is, de facto, the first finding of C. raciborskii in Serbia. It is of particular importance given that C. raciborskii produces cyanotoxins and that available data show that in Serbia this alga is expanding its range of distribution, notably in carp ponds. The present paper is concerned with both the general and specific characteristics of the alga and the specific characteristics of the habitat in which the alga was found.
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Menezes, Carina, Elisabete Valério, Maria João Botelho i Elsa Dias. "Isolation and Characterization of Cylindrospermopsis raciborskii Strains from Finished Drinking Water". Toxins 12, nr 1 (8.01.2020): 40. http://dx.doi.org/10.3390/toxins12010040.

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In the summer of 2015, an intense cyanobacterial bloom producing geosmin/2-methylisoborneol (MIB) occurred in the Roxo freshwater reservoir in Alentejo, Portugal. The drinking water supplied from the Roxo water treatment plant (WTP) exhibited an unpleasant odor/taste and a significant cyanobacteria density was detected in the finished water at the exit of the WTP. Cyanobacteria were not evaluated downstream of the WTP, namely, at the city reservoir. The aim of this work was to isolate and characterize viable cyanobacteria present in finished water (exit of the WTP and city reservoir) that withstand conventional water treatment. Treated water samples collected at both sites were inoculated in Z8 culture medium to provide the conditions for putative cyanobacterial growth. After 30 days, filamentous cyanobacteria were observed in cultures inoculated with samples from the exit point of the WTP. Viable trichomes were isolated and identified as Cylindrospermopsis raciborskii by morphometric and molecular analysis. None of the isolates were cylindrospermopsin/microcystin producers, as confirmed by ELISA and amplification of corresponding genes (PS/PKS and mcyA-cd/mcyAB/mcyB). ELISA results were positive for saxitoxin, but saxitoxin and derivatives were not detected by liquid chromatography with fluorescence detection (LC-FLD), nor were their related genes (sxtA/sxtA4/sxtB/sxtM/sxtPer/sxtI). To our knowledge, this is the first report on the establishment of cultures of C. raciborskii that resisted water treatment processes.
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Mohamed, Zakaria, Fadel Ali, Medahat Abdel-Lateef i Asmaa Hosny. "Growth inhibition of the toxic cyanobacterium Cylindrospermopsis raciborskii by extremely low-frequency electromagnetic fields". Acta botanica Croatica 79, nr 2 (10.07.2020): 193–200. http://dx.doi.org/10.37427/botcro-2020-022.

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This study investigates the effects of extremely low-frequency electromagnetic fields (ELF-EMFs) on the growth and antioxidant defence enzymes of the toxic cyanobacterium Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju. To determine resonance frequency of growth inhibition of C. raciborskii, cells were subjected to ELF square amplitude modulated waves (QAMW) with a range of frequencies (0.1, 0.3, 0.5, 0.7, 0.9 Hz) at single intensity of 100 V m–1 for 30 minutes. The results revealed that the highest growth inhibition of Cylindrospermopsis occurred upon exposure to 0.7 Hz QAMW for 30 min. ELF-EMF-exposed cultures exhibited a marked decrease in cell number, chlorophyll-a content and activity of antioxidant enzymes compared to control cultures, and this effect increased with the prolongation of exposure time. Moreover, ELF-EMF induced morphological changes in Cylindrospermopsis cells upon exposure to 0.7 Hz QAMW for 120 min, including shrinking and disintegration of cytoplasmic contents, and thickening of the cell wall. Changes in dielectric properties, as a measure of interaction of cellular constituents (e.g., plasma membrane, cell wall and cytoplasm), with electromagnetic fields were also observed for treated cells. Our results provide a new possibility for using ELF-EMFs to eliminate toxic cyanobacteria from drinking and recreational water sources.
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Tonietto, Alessandra Emanuele, Natalia L. Oliveira, Ana Teresa Lombardi i Adriano Polpo. "Copper and cadmium complexation by Cylindrospermopsis raciborskii exudates". Water Science and Technology 73, nr 10 (4.03.2016): 2544–51. http://dx.doi.org/10.2166/wst.2016.111.

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Cylindrospermopsis raciborskii is a potentially toxic cyanobacterium that excretes organic materials which act as ligands for metals. Metal ligands may be characterized for their strength of association, e.g., stability constants, which can be either thermodynamic (K) or conditional (K’). In this research we examined K and K’ for Cu and Cd complexes with three molecular weight fractions (>30 kDa; 30–10 kDa; 10–3 kDa) of the cyanobacteria EOM. Complexation capacities of the excreted organic materials (EOM) for metals were determined at several ionic strengths (1.0 × 10−2, 5.0 × 10−2, 1.0 × 10−1, and 5.0 × 10−1 mol L−1) at pH 6.6 ± 0.1, with ligands for which no data for their acidity constants are available; these constants are thus conditional for this specific pH. Bayesian statistics showed that with a probability of 95–100% the EOM have two different ligands for Cu but only one for Cd, that ligands for Cu were stronger than for Cd (94–100% probability), and that the smallest EOM fraction had the highest strength of association for Cu (logKCuL 13.5). The lowest affinity was obtained for Cd (logKCdL 8.6) complexed to any molecular weight fraction. The present findings have important ecological implications, since the metal–ligand association is dynamic, and together with a diversity of ligands it can act as an environmental metal buffer. As a result, higher metal loads may be necessary for the detection of toxicity.
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Mesquita, Marcella, Miquel Lürling, Fabiane Dorr, Ernani Pinto i Marcelo Marinho. "Combined Effect of Light and Temperature on the Production of Saxitoxins in Cylindrospermopsis raciborskii Strains". Toxins 11, nr 1 (14.01.2019): 38. http://dx.doi.org/10.3390/toxins11010038.

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Cylindrospermopsis raciborskii is a potentially toxic freshwater cyanobacterium that can tolerate a wide range of light and temperature. Due to climatic changes, the interaction between light and temperature is studied in aquatic systems, but no study has addressed the effect of both variables on the saxitoxins production. This study evaluated the combined effect of light and temperature on saxitoxins production and cellular quota in C. raciborskii. Experiments were performed with three C. raciborskii strains in batch cultures under six light intensities (10, 40, 60, 100, 150, and 500 μmol of photons m−2 s−1) and four temperatures (15, 20, 25, and 30 °C). The growth of C. raciborskii strains was limited at lower temperatures and the maximum growth rates were obtained under higher light combined with temperatures equal or above 20 °C, depending on the strain. In general, growth was highest at 30 °C at the lower light intensities and equally high at 25 °C and 30 °C under higher light. Highest saxitoxins concentration and cell-quota occurred at 25 °C under high light intensities, but were much lower at 30 °C. Hence, increased temperatures combined with sufficient light will lead to higher C. raciborskii biomass, but blooms could become less toxic in tropical regions.
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Rigamonti, N., L. Aubriot, F. Martigani, S. Bonilla i C. Piccini. "Effect of nutrient availability on cylindrospermopsin gene expression and toxin production in Cylindrospermopsis raciborskii". Aquatic Microbial Ecology 82, nr 1 (20.09.2018): 105–10. http://dx.doi.org/10.3354/ame01877.

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Burford, Michele A., Anusuya Willis, Ann Chuang, Xiao Man i Philip T. Orr. "Recent insights into physiological responses to nutrients by the cylindrospermopsin producing cyanobacterium, Cylindrospermopsis raciborskii". Journal of Oceanology and Limnology 36, nr 4 (lipiec 2018): 1032–39. http://dx.doi.org/10.1007/s00343-018-7179-5.

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Várkonyi, Z., O. Zsiros, T. Farkas, G. Garab i Z. Gombos. "The tolerance of cyanobacterium Cylindrospermopsis raciborskii to low-temperature photo-inhibition affected by the induction of polyunsaturated fatty acid synthesis". Biochemical Society Transactions 28, nr 6 (1.12.2000): 892–94. http://dx.doi.org/10.1042/bst0280892.

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Acyl-lipid desaturation introduces double bonds (unsaturated bonds) at specifically defined positions of fatty acids that are esterified to the glycerol backbone of membrane glycerolipids. Desaturation patterns of the glycerolipids of Cylindrospermopsis raciborskii a filamentous cyanobacterium, were determined in cells grown at 35°C and 25°C. The lowering of the growth at 35°C and 25°C. The lowering of the growth temperature from 35°C to 25°C resulted in a considerable accumulation of polyunsaturated octadecanoic fatty acids in all lipid classes. The tolerance to low-temperature photo-inhibition of the C. raciborskii cells grown at 25°C and 35°C was also compared. The lower growth temperature increased the tolerance of C. raciborskii cells. These results strengthen the importance of polyunsaturated glycerolipids in the tolerance to environmental stresses and may give a physiological explanation for the determinative role of C. raciborskii in algal blooming in Lake Balaton (Hungary).
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Zheng, Ling, Yang Liu, Renhui Li, Yiming Yang i Yongguang Jiang. "Recent Advances in the Ecology of Bloom-Forming Raphidiopsis (Cylindrospermopsis) raciborskii: Expansion in China, Intraspecific Heterogeneity and Critical Factors for Invasion". International Journal of Environmental Research and Public Health 20, nr 3 (21.01.2023): 1984. http://dx.doi.org/10.3390/ijerph20031984.

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Water blooms caused by the invasive cyanobacterium Raphidiopsis raciborskii occur in many reservoirs in the tropical and subtropical regions of China. In recent decades, this species has spread rapidly to temperate regions. Phenotypic plasticity and climate warming are thought to promote the worldwide dispersion of R. raciborskii. However, investigations into the genetic and phenotypic diversities of this species have revealed significant intraspecific heterogeneity. In particular, competition between R. raciborskii and Microcystis aeruginosa was highly strain dependent. Although the concept of an ecotype was proposed to explain the heterogeneity of R. raciborskii strains with different geographic origins, microevolution is more reasonable for understanding the coexistence of different phenotypes and genotypes in the same environment. It has been suggested that intraspecific heterogeneity derived from microevolution is a strong driving force for the expansion of R. raciborskii. Additionally, temperature, nutrient fluctuations, and grazer disturbance are critical environmental factors that affect the population establishment of R. raciborskii in new environments. The present review provides new insights into the ecological mechanisms underlying the invasion of R. raciborskii in Chinese freshwater ecosystems.
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Casali, Simone Pereira, André Cordeiro Alves Dos Santos, Patrícia Bortoletto de Falco i Maria do Carmo Calijuri. "Influence of environmental variables on saxitoxin yields by Cylindrospermopsis raciborskii in a mesotrophic subtropical reservoir". Journal of Water and Health 15, nr 4 (25.03.2017): 509–18. http://dx.doi.org/10.2166/wh.2017.266.

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Saxitoxins are a class of toxins produced by at least two groups of evolutionarily distant organisms (cyanobacteria and dinoflagellates). While the toxicity of these toxins is relatively well characterized, to date little is known about their drivers and ecological functions, especially in lower latitude tropical and subtropical freshwater ecosystems. In the present study, we aimed to obtain a better understanding of the main drivers of saxitoxin concentrations in aquatic environments. We investigated the relationships among saxitoxin concentrations in a mesotrophic subtropical reservoir dominated by the cyanobacteria Cylindrospermopsis raciborskii with physical, chemical and biological water variables. The highest saxitoxin concentrations were 0.20 μg·L−1, which occurred in the samples with the highest densities of C. raciborskii (maximum of 4.3 × 104 org·mL−1) and the highest concentration of dissolved nutrients (nitrate from 0.2 to 0.8 μg·L−1, ortophosphate from 0.3 to 8.5 μg·L−1). These correlations were confirmed by statistical analyses. However, the highest saxitoxin relative concentrations (per trichome) were associated with lower C. raciborskii densities, suggesting that saxitoxin production or the selection of saxitoxin-producing strains was associated with the adaptation of this species to conditions of stress. Our results indicate that C. raciborskii toxin yields vary depending on the enrichment conditions having potential implications for reservoir management.
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Sinha, Rati, Leanne A. Pearson, Timothy W. Davis, Julia Muenchhoff, Ryanbi Pratama, Aaron Jex, Michele A. Burford i Brett A. Neilan. "Comparative genomics of Cylindrospermopsis raciborskii strains with differential toxicities". BMC Genomics 15, nr 1 (2014): 83. http://dx.doi.org/10.1186/1471-2164-15-83.

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Nagy, Veronika, Attila Agócs, József Deli, Gergely Gulyás-Fekete, Tünde-Zita Illyés, Tibor Kurtán, Erika Turcsi i in. "Carotenoid glycoside isolated and identified from cyanobacterium Cylindrospermopsis raciborskii". Journal of Food Composition and Analysis 65 (styczeń 2018): 6–10. http://dx.doi.org/10.1016/j.jfca.2017.06.003.

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MOORE, DAVID, MARK O'DONOHUE, CORINNE GARNETT, CHRISTA CRITCHLEY i GLEN SHAW. "Factors affecting akinete differentiation in Cylindrospermopsis raciborskii (Nostocales, Cyanobacteria)". Freshwater Biology 50, nr 2 (18.01.2005): 345–52. http://dx.doi.org/10.1111/j.1365-2427.2004.01324.x.

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Moreira, Cristiana, Afef Fathalli, Vitor Vasconcelos i Agostinho Antunes. "Phylogeny and biogeography of the invasive cyanobacterium Cylindrospermopsis raciborskii". Archives of Microbiology 197, nr 1 (8.11.2014): 47–52. http://dx.doi.org/10.1007/s00203-014-1052-5.

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35

Moura, Ariadne do Nascimento, Maria do Carmo Bittencourt-Oliveira, Mathias Alii Chia i Juliana Santos Severiano. "Co-occurrence of Cylindrospermopsis raciborskii (Woloszynska) Seenaya & Subba Raju and Microcystis panniformis Komárek et al. in Mundaú reservoir, a semiarid Brazilian ecosystem". Acta Limnologica Brasiliensia 27, nr 3 (wrzesień 2015): 322–29. http://dx.doi.org/10.1590/s2179-975x3814.

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Abstract The influence of temperature and nutrients on the co-occurrence of Cylindrospermopsis raciborskii and Microcystis panniformis in Mundaú reservoir was investigated. Samples were collected bimonthly from September 2008 to March 2009 with a Van Dorn bottle at two depths (surface and bottom) (n = 16). Water temperature was greater than 22.50 °C; pH values ranged from 6.09 to 8.42; and nitrogen-phosphorus ratios were low (0.11-1.46). The low N:P ratios indicated high phosphorus input, and an eutrophic to hypereutrophic condition in the reservoir. A significant positive correlation of spatial and temporal distribution of C. raciborskii with M. panniformis was observed. Canonical correlation analysis (CCA) results revealed significant association of the biomass of most cyanobacterial species with temperature and nutrients concentration. However, these factors did not explain the co-occurrence of C. raciborskii and M. panniformis. On the other hand, morphological and physiological adaptations such as the possession of aerotopes and production of mucilage, and co-operation between the two species permitted niche overlap, and consequently the co-occurrence of C. raciborskii and M. panniformis in Mundaú reservoir.
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36

Li, R., W. W. Carmichael, S. Brittain, G. K. Eaglesham, G. R. Shaw, A. Mahakhant, N. Noparatnaraporn, W. Yongmanitchai, K. Kaya i M. M. Watanabe. "Isolation and identification of the cyanotoxin cylindrospermopsin and deoxy-cylindrospermopsin from a Thailand strain of Cylindrospermopsis raciborskii (Cyanobacteria)". Toxicon 39, nr 7 (lipiec 2001): 973–80. http://dx.doi.org/10.1016/s0041-0101(00)00236-1.

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37

Davis, Timothy W., Philip T. Orr, Gregory L. Boyer i Michele A. Burford. "Investigating the production and release of cylindrospermopsin and deoxy-cylindrospermopsin by Cylindrospermopsis raciborskii over a natural growth cycle". Harmful Algae 31 (styczeń 2014): 18–25. http://dx.doi.org/10.1016/j.hal.2013.09.007.

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LI, XIAO-CHUANG, SHOU-LIANG HUO, FANG-FANG CAI, YI-MING YANG, BEI-DOU XI i REN-HUI LI. "The taxonomy and phylogeny of the genus Cylindrospermopsis (Cyanobacterium) evaluated by adding five new records from China". Phytotaxa 316, nr 3 (8.08.2017): 224. http://dx.doi.org/10.11646/phytotaxa.316.3.2.

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The diversity of the genus Cylindrospermopsis was underestimated, and the species in majority were described from natural populations, and not evaluated genetically except for the widely reported C. raciborskii. In the study, five new records (C. catemaco, C. philippinensis, C. taverae, C. africana and C. helicoidea) were herein described from Chinese freshwater bodies. By isolating their unialgal cultures, they were taxonomically evaluated based on phenotypic and genetic characters (16S rRNA, ITS-L, cpcBA-IGS and rpoC1). New insights into the Cylindrospermopsis taxonomy were obtained that different species within the genus could not be fully distinguished. The present result suggested that morphospecies based taxonomy within cyanobacterial genera will still be used, waiting for further verification and taxonomic revision at species level based on the modern approaches.
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Dantas, Ênio Wocyli, Maria do Carmo Bittencourt-Oliveira i Ariadne do Nascimento Moura. "Spatial-temporal variation in coiled and straight morphotypes of Cylindrospermopsis raciborskii (Wolsz) Seenayya et Subba Raju (Cyanobacteria)". Acta Botanica Brasilica 24, nr 2 (czerwiec 2010): 585–91. http://dx.doi.org/10.1590/s0102-33062010000200028.

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This study reports the spatial and temporal behavior of straight and coiled morphotypes of C. raciborskii in a reservoir in Brazil's semi-arid region as well as the main factors responsible for the variability. Two set of samples were collected from the subsurface and bottom in the central region of a reservoir in two seasonal periods (dry - January 2005; rainy - June 2005) over 20-hour sampling periods during daylight (8 am, 12 pm and 4 pm) and dark (8 pm, 12 am and 4 am) hours. Measurements of abiotic parameters were determined concurrently to the sampling of biotic variables. Two C. raciborskii morphotypes were found in the reservoir: straight and coiled. There was no difference in density of the straight and coiled C. raciborskii morphotypes between the different sampling times for either season. Vertical differences were found in the distribution of both morphotypes in both seasons, with greater densities recorded at the subsurface. Densities of the two C. raciborskii morphotypes were greater in the dry season, with the density of the coiled morphotype at the surface two-fold greater than that of the straight morphotype and that found in the rainy season. The ecological success of the coiled morphotype was due to thermal stratification, whereas a mixed condition was determinant in the success of the straight morphotype.
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A.L., Fonseca, Lankoff A., Azevedo S.M.F.O. i Soares R.M. "Effects on DNA and cell viability of treated water contaminated with Cylindrospermopsis raciborskii extract including cylindrospermopsin". Journal of the Brazilian Society of Ecotoxicology 8, nr 1 (1.07.2013): 135–41. http://dx.doi.org/10.5132/eec.2013.01.020.

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Lei, Lamei, Jingjun Dai, Qiuqi Lin i Liang Peng. "Competitive dominance of Microcystis aeruginosa against Raphidiopsis raciborskii is strain- and temperature-dependent". Knowledge & Management of Aquatic Ecosystems, nr 421 (2020): 36. http://dx.doi.org/10.1051/kmae/2020023.

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Microcystis aeruginosa and Raphidiopsis raciborskii (previously Cylindrospermopsis raciborskii) are both common bloom-forming cyanobacteria which can coexist but alternatively dominate in freshwater ecosystems. To predict their blooming dynamics, we need to understand the potential environmental factors determining their succession. In the present study, we examined the pairwise competition of the three M. aeruginosa strains (FACHB905, 469 and 915) with one R. raciborskii strain (N8) at three temperature levels (16 °C, 24 °C, and 32 °C). We found that the competitive ability of three Microcystis strains were highly variable. M. aeruginosa FACHB905 was the strongest competitor among them which can finally exclude R. raciborskii N8 regardless of initial biovolume ratios and temperature levels. The competitive exclusion of N8 by 915 also was observed at 24 °C, but they coexisted at 16 °C and 32 °C. We observed that M. aeruginosa FACHB469 and R. raciborskii N8 were able to coexist under all the temperature levels, and M. aeruginosa FACHB469 was the weakest competitor among the three M. aeruginosa strains. Rates of competitive exclusion (RCE) showed that temperature affects the competition between three M. aeruginosa strains and R. raciborskii N8. M. aeruginosa strains always grew quickly at 24 °C and significantly enlarged its dominance in the co-culture system, while R. raciborskii N8 was able to maintain its initial advantages at both 16 and 32 °C. The competitive advantage of M. aeruginosa FACHB905 may be explained by allelopathic interactions through its allelochemicals and other secondary metabolites other than microcystin. We concluded that both strain difference and temperature can affect the competition between M. aeruginosa and R. raciborskii. Our results highlighted the complexity of cyanobacterial dynamics in waterbodies where there exist multiple strains.
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Lopes, K. C., A. S. Ferrão-Filho, E. G. N. Santos i C. P. Santos. "First report of neurotoxic effect of the cyanobacterium Cylindrospermopsis raciborskii on the motility of trematode metacercariae". Journal of Helminthology 92, nr 2 (28.03.2017): 244–49. http://dx.doi.org/10.1017/s0022149x17000281.

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AbstractCylindrospermopsis raciborskii (Woloszynska) is a photosynthetic cyanobacterium that can produce cytotoxic (cylindrospermopsin) and neurotoxic cyanotoxins (saxitoxins). In Brazil the strains of C. raciborskii are reported to produce only saxitoxins (STX) and their effect on fish parasites has not been tested to date. The fish Poecilia vivipara Bloch and Schneider is a common host for the trematode Pygidiopsis macrostomum Travassos off the coast of Rio de Janeiro, and this fish–parasite interaction is a model for behavioural and ecotoxicological studies. The aim of this work was to evaluate the motility of metacercariae of P. macrostomum from P. vivipara exposed to 40 mg l−1 and 400 mg l−1 of crude lyophilized extract of the cyanobacterium C. raciborskii (CYRF-01) for 48 h. The fish were separated into groups of ten individuals and, after exposure, five fish from each group were dissected for counting and checking the motility of metacercariae. The other five fish were dissected after 48 h in clean water. The detection and quantification of STX in the solutions of cyanobacteria, and the gills and guts of fish, were performed by an enzyme-linked immunosorbent assay. The crude extract of C. raciborskii caused temporary paralysis in metacercariae of P. macrostomum after exposure of fish to both concentrations, and the motility recovered after the fish were kept for 48 h in clean water. STX was detected in the guts and gills of all fish analysed, suggesting that this toxin is involved in the paralysis of metacercariae. This is the first report on the action of neurotoxins in metacercariae of fish.
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Yatigammana, S. K., i M. B. U. Perera. "Distribution of Cylindrospermopsis raciborskii (Cyanobacteria) in Sri Lanka". Ceylon Journal of Science 46, nr 3 (26.09.2017): 65. http://dx.doi.org/10.4038/cjs.v46i3.7444.

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Carneiro, Ronaldo Leal, Ana Carla Nascimento Alípio, Paulo Mascarello Bisch, Sandra Maria Feliciano de Oliveira Azevedo i Ana Beatriz Furlanetto Pacheco. "The inhibitory effect of calcium on Cylindrospermopsis raciborskii (cyanobacteria) metabolism". Brazilian Journal of Microbiology 42, nr 4 (grudzień 2011): 1547–59. http://dx.doi.org/10.1590/s1517-83822011000400042.

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45

Saker, Martin L. "Distribution and toxicity of Cylindrospermopsis raciborskii (Cyanobacteria) in Portuguese freshwaters". Limnetica 23, nr 1 (15.06.2004): 145–52. http://dx.doi.org/10.23818/limn.23.12.

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Martin, Robbie M., Mohammad Moniruzzaman, Nicholas C. Mucci, Anusuya Willis, Jason N. Woodhouse, Yuejiao Xian, Chuan Xiao, Corina P. D. Brussaard i Steven W. Wilhelm. "Cylindrospermopsis raciborskii Virus and host: genomic characterization and ecological relevance". Environmental Microbiology 21, nr 6 (25.10.2018): 1942–56. http://dx.doi.org/10.1111/1462-2920.14425.

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47

Moisander, Pia H., Lou Anne Cheshire, Jeremy Braddy, Elizabeth S. Calandrino, Melissa Hoffman, Michael F. Piehler i Hans W. Paerl. "Facultative diazotrophy increases Cylindrospermopsis raciborskii competitiveness under fluctuating nitrogen availability". FEMS Microbiology Ecology 79, nr 3 (4.01.2012): 800–811. http://dx.doi.org/10.1111/j.1574-6941.2011.01264.x.

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48

Hawkins, Peter R., Nimal R. Chandrasena, Gary J. Jones, Andrew R. Humpage i Ian R. Falconer. "Isolation and toxicity of Cylindrospermopsis raciborskii from an ornamental lake". Toxicon 35, nr 3 (marzec 1997): 341–46. http://dx.doi.org/10.1016/s0041-0101(96)00185-7.

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Svirčev, Zorica, Vesna Obradović, Geoffrey A. Codd, Prvoslav Marjanović, Lisa Spoof, Damjana Drobac, Nada Tokodi i in. "Massive fish mortality and Cylindrospermopsis raciborskii bloom in Aleksandrovac Lake". Ecotoxicology 25, nr 7 (28.06.2016): 1353–63. http://dx.doi.org/10.1007/s10646-016-1687-x.

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Rzymski, Piotr, Agnieszka Brygider i Mikołaj Kokociński. "On the occurrence and toxicity of Cylindrospermopsis raciborskii in Poland". Limnological Review 17, nr 1 (1.03.2017): 23–29. http://dx.doi.org/10.1515/limre-2017-0003.

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AbstractCylindrospermopsis raciborskiiwhich belongs to the order of Nostocales has continuously been at the centre of interest of various research groups owing to its great ecological plasticity, wide distribution and potential to produce different metabolites known to be harmful for humans and animals. Over recent decades, Polish strains ofC.raciborskiihave also been studied with regard to these issues. The present paper is a brief review of the present state of knowledge respecting the occurrence and toxicity of this species with emphasis on Polish strains, and indicates potential directions for future research.
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