A5022378658- Diatoms and Algae Research
- Marine and coastal ecosystems
- Algal biology and biofuel production
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Protist diversity and phylogeny
- Marine and environmental studies
- Analytical chemistry methods development
- Marine Toxins and Detection Methods
- Marine Biology and Ecology Research
- Genomics and Phylogenetic Studies
- Marine Biology and Environmental Chemistry
- Aquatic Invertebrate Ecology and Behavior
- Identification and Quantification in Food
- Analytical Chemistry and Sensors
- Paleontology and Stratigraphy of Fossils
- Water Quality Monitoring and Analysis
- Biocrusts and Microbial Ecology
- Aquaculture Nutrition and Growth
- Environmental Toxicology and Ecotoxicology
- Force Microscopy Techniques and Applications
- Aquatic and Environmental Studies
- Environmental Chemistry and Analysis
- Environmental Science and Water Management
- Phytochemical Studies and Bioactivities
Russian Academy of Sciences
2016-2025
Skolkovo Institute of Science and Technology
2023-2025
A.O. Kovalevsky Institute of Biology of the Southern Seas
1998-2024
Russian Academy of Natural Sciences
2021-2023
University of Szczecin
2016-2022
Veterinary Services and Animal Health
2021
Ministry of Agriculture and Rural Development
2021
Academy of Sciences of the Republic of Bashkortostan
2021
Baikal Nature Reserve
2014-2019
National Academy of Sciences
2009-2014
Clones of the domoic‐acid‐producing pennate diatom Pseudo‐nitzschia multiseries (Hasle) Hasle and potentially toxic P. pseudodelicatissima normally decrease in cell size culture until they eventually die without undergoing sexual reproduction to regain largest size. However, we induced by mixing individual exponentially growing clonal cultures appropriate minimal under same conditions that are normal for vegetative growth. We observed pairing parent cells (gametangiogamy); production four...
Abstract Diatoms are single cell microalgae enclosed in silica exoskeletons (frustules) that provide inspiration for advanced hybrid nanostructure designs mimicking multi-scale porosity to achieve outstanding mechanical and optical properties. Interrogating the structure properties of diatoms down nanometer scale leads breakthrough advances reported here nanomechanical characterization Coscinodiscus oculus-iridis diatom pure frustules, as well air-dried wet cells with organic content. Static...
Sexual reproduction is an obligatory phase in the life cycle of most diatoms, as cell size decreases with successive vegetative divisions and maximal only restored by a specialized cell, auxospore, which follows zygote formation result sexual reproduction. While pennate diatoms induction depends primarily on cell-cell interactions, importance different external factors for less well known. Here, we investigated effects light sexualization marine benthic diatom Haslea ostrearia (Gaillon) R....
A new species of raphid pennate diatom producing a blue pigment, Haslea karadagensis Davidovich, Gastineau & Mouget, sp. nov., was recently isolated from the Crimean coast Black Sea (Ukraine). This organism is very similar to well-known ostrearia, first described 'blue' diatom, which produces marennine, pigment involved in greening oysters. The Ukrainian H. karadagensis, differs slightly ostrearia structure its frustule, and two organisms are unable interbreed. Two molecular markers, rbcL...
Fragilaria and Ulnaria are two closely related diatom genera for which the delimitation circumscription of several species is unclear. We studied strains isolated from Lake Baikal compared them with freshwater reservoirs in Europe Asia using phylogenetic methods, microscopy interclonal crossing experiments. The results analyses fragments rbcL 18S rRNA genes revealed that baikalian F. radians clade was independent representatives genus other localities. Among we found following tree groups at...
Haslea provincialis Gastineau, Hansen & Mouget, sp. nov., is a new, morphologically semicryptic blue diatom discovered on the French shores of Mediterranean Sea. Like H. ostrearia and karadagensis, shares capacity to synthesize marennine-like pigment. Sexual reproduction between clones has been repeatedly observed resulted in viable initial cells. There were no sexual interactions with sexually competent or as would be expected for separate biological species. are strong similarities pigment...
Sexual behaviour, pattern of auxosporulation, and breeding system the araphid diatom Tabularia fasciculata were studied using 64 clones derived from two natural populations Canadian Atlantic seashore Black Sea.Both inter-and intraclonal reproductions observed.Heterothallic reproduction was morphologically behaviourally heterogamous.The heterothallic nature sexual in this species allowed determination sex ratio population, which 1:1 male:female.A novel type active movement gametes designated...
:The focus of this paper is the sexual reproduction and phylogeny Schizostauron Grunow, which were studied using clonal cultures isolated from Indian Ocean coast Mozambique near Tofo Bazaruto. Taxa characterized by light electron microscopy a derived three genes (rbcL, psbC short subunit). was established in second half 19th century, then forgotten, with its taxa included Cocconeis or Achnanthes sensu lato. Schizostauron, together Astartiella perhaps also Kolbesia Karayevia, seems to form...
Twelve clonal cultures of the marine pennate diatom Haslea ostrearia (Gaillon) Simonsen were used to study sexual reproduction and auxosporulation. After crossing, compatible gametangia paired girdle girdle, with no visible surrounding mucilage. Two gametes formed per gametangium; these not attached thecae parental frustule from one gametangium fused other gametangium. Sexual was isogamous, resulting in production two zygotes gametangia. The pattern H. can be classified as type IB2a...
For decades, the diatom genus Haslea has been known to comprise both "colorless" species and one containing a blue pigment, latter being as H. ostrearia.Recently, new named H.karadagensis isolated from Black Sea.The mating compatibility of two tested, their reproductive isolation confirmed.We provide detailed description heterothallic sexual reproduction process in this species.Cells clones which are sexually compatible arrange gametangial pairs.Each gametangium pair produces gametes, large...
Specimens of a new species blue diatoms from the genus Haslea Simonsen were discovered in geographically distant sampling sites, first Canary Archipelago, then North Carolina, Gulf Naples, Croatian South Adriatic Sea, and Turkish coast Eastern Mediterranean Sea. An exhaustive characterization these specimens, using combined morphological genomic approach led to conclusion that they belong single science cosmopolitan species, silbo sp. nov. A preliminary its pigment shows similarities...
Abstract Molecular phylogenetic analyses place Ardissonea crystallina (C. Agardh) Grunow and all Toxariids among the bi- multipolar centric diatoms, almost always recovered as a derived lineage sister to Lampriscus . In centrics where sexual reproduction has been documented, oogamy, with larger immobile eggs smaller flagellated sperm observed. We were able initiate both homothallic heterothallic in A. The turned out be non-oogamous; gametes more or less equal size but no cells detected. At...
Эксперименты с клоновыми культурами четырёх видов пеннатных диатомовых водорослей, Haslea karadagensis, H. ostrearia, Pleurosigma sp. и Pseudo-nitzschia cf. seriata, показали, что добавление в среду ESAW тиосульфата натрия приводит к увеличению темпа деления клеток. Наибольшее, почти двукратное, увеличение темпов (по сравнению таковым при использовании обычного состава среды) отмечено у seriata — представителя рода, включающего токсикогенные виды. Изучена зависимость от концентрации среде....
Abstract We examined the fine structure of gametes and auxospore wall in heterothallic pennate raphid diatom Nitzschia longissima (sensu Karsten 1897). The presence scales gamete both sexes is demonstrated for first time a species. Silica was documented by energy dispersive x-ray spectroscopy. This finding supports our earlier hypothesis that are present sex cells more often than previously considered reflect their evolutionary relationship to scale-bearing ancestors. In addition, shown...
Kaczmarska I., Ehrman J.M., Moniz M.B.J. and Davidovich N. 2009. Phenotypic genetic structure of interbreeding populations the diatom Tabularia fasciculata (Bacillariophyta). Phycologia 48: 391–403. DOI: 10.2216/08-74.1.Diatom alpha-taxonomy heavily relies on discontinuity in variation species-specific structures siliceous components cell wall. However, considerable intraspecific variability valve morphology is to be expected because peculiar mode genesis during tenure asexual part life...
Diatom frustules, the intricately structured algal silica exoskeletons, have remarkable mechanical properties and so are ideal candidates for various engineering applications. This study presents a comprehensive investigation of eigenmode resonance frequencies diatom frustules through combination in silico experimental characterization. The predictions range 1–8 MHz, which were made by COMSOL Multiphysics, experimentally validated using optical detection system atomic force microscope....