Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-2-1
I. Udalov, A. Gavrilov, A. Kudryavtsev, E. Volkova, Vasily V. Zlatogursky
A new species of centrohelid heliozoans Pterocystis caudata sp. n. from the Bay of Villefranche (France) was studied with light and electron microscopy. The cell diameter is 7.6–19.0 (av. 12.4) µm. P. caudata has scales of two distinct types. Plate scales (2.08–3.48 (av. 2.6) × 1.07–1.65 (av. 1.3) µm) are flat, oval, with parallel edges and axial thickening. Spine scales (2.47–7.1 (av. 4.6) µm) with a funnel-shaped base, which is indistinctly continuous with a shaft. The shaft demonstrates gradual levels of reduction; in some scales it is completely absent. The surface of the spine scales is smooth, ornamented with few slits at the base of the shaft and on the surface of the funnel and has a thin marginal border. The cells are floating or attached to the substratum, sometimes in aggregates of 2–3 cells. The species diversity of Pterocystis spp. with leaf-shaped and scoop-shaped spine scales is discussed.
{"title":"Pterocystis caudata sp. n. – the new species of centrohelid heliozoans (Pterocystidae, Pterocystida, Centroplasthelida) from the Bay of Villefranche, France","authors":"I. Udalov, A. Gavrilov, A. Kudryavtsev, E. Volkova, Vasily V. Zlatogursky","doi":"10.21685/1680-0826-2023-17-2-1","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-2-1","url":null,"abstract":"A new species of centrohelid heliozoans Pterocystis caudata sp. n. from the Bay of Villefranche (France) was studied with light and electron microscopy. The cell diameter is 7.6–19.0 (av. 12.4) µm. P. caudata has scales of two distinct types. Plate scales (2.08–3.48 (av. 2.6) × 1.07–1.65 (av. 1.3) µm) are flat, oval, with parallel edges and axial thickening. Spine scales (2.47–7.1 (av. 4.6) µm) with a funnel-shaped base, which is indistinctly continuous with a shaft. The shaft demonstrates gradual levels of reduction; in some scales it is completely absent. The surface of the spine scales is smooth, ornamented with few slits at the base of the shaft and on the surface of the funnel and has a thin marginal border. The cells are floating or attached to the substratum, sometimes in aggregates of 2–3 cells. The species diversity of Pterocystis spp. with leaf-shaped and scoop-shaped spine scales is discussed.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67895421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-2-2
I. Prikhodko, O. Shchepin, Y. Novozhilov, V. Gmoshinskiy, M. Schnittler
{"title":"Reassessing the phylogenetic position of the genus Kelleromyxa (Myxomycetes = Myxogastrea) using genome skimming data","authors":"I. Prikhodko, O. Shchepin, Y. Novozhilov, V. Gmoshinskiy, M. Schnittler","doi":"10.21685/1680-0826-2023-17-2-2","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-2-2","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67895681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-2-6
Amanda T. S. Albanaz, A. Butenko, A. Kostygov, J. Votýpka, V. Yurchenko
{"title":"Transcriptome of Lafontella sp., an obscure relative of Phytomonas and Herpetomonas","authors":"Amanda T. S. Albanaz, A. Butenko, A. Kostygov, J. Votýpka, V. Yurchenko","doi":"10.21685/1680-0826-2023-17-2-6","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-2-6","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67896362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-3-3
Olga Kornilova, Maria Skazina, Maria Belokon, Natalia Egorova, Ludmila Chistyakova
{"title":"Ciliates from faeces of kiang Equus kiang kept in a zoo, with analysis of interspecific differences of 18S sequences among trichostomatids (Litostomatea)","authors":"Olga Kornilova, Maria Skazina, Maria Belokon, Natalia Egorova, Ludmila Chistyakova","doi":"10.21685/1680-0826-2023-17-3-3","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-3-3","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135711227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-3-2
Sergei I. Fokin
{"title":"A marine Paramecium species – does it exist?","authors":"Sergei I. Fokin","doi":"10.21685/1680-0826-2023-17-3-2","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-3-2","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135711234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2022-17-3-6
Yuliya Y. Sokolova
{"title":"Earl Weidner (1935-2022), the pioneer of research on physiology and biochemistry of microsporidia","authors":"Yuliya Y. Sokolova","doi":"10.21685/1680-0826-2022-17-3-6","DOIUrl":"https://doi.org/10.21685/1680-0826-2022-17-3-6","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135712275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-1-1
D. Hernández-Becerril, Pamela Meza-García, Ana M. Villarreal-Martínez, Tania M. García-Anaya, Erandi D. Vázquez-Montes, K. Esqueda-Lara, Jovanny Arana-García
{"title":"Observations on some planktonic dinophysoid dinoflagellates (Dinophysales, Dinophyta) from the Mexican Pacific, including the description of a new species, Dinofurcula pseudoultima sp. nov., and taxonomic and distribution notes about the genera Latifascia and Triposolenia","authors":"D. Hernández-Becerril, Pamela Meza-García, Ana M. Villarreal-Martínez, Tania M. García-Anaya, Erandi D. Vázquez-Montes, K. Esqueda-Lara, Jovanny Arana-García","doi":"10.21685/1680-0826-2023-17-1-1","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-1-1","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67894627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21685/1680-0826-2023-17-1-2
Z. Zalutskaya, Sofia Korkina, E. Ermilova
nitrate reductase (NR), which governs the reduction of nitrate to nitrite. The unicellular green alga Dunaliella salina is a special case, as its cells have two NRs. This makes D. salina attractive to study the mechanisms underlying the nitrate assimilation in photosynthetic unicellular organisms. Here we characterize the expression of the gene encoding the second NR, named as DsaNIA1 . Low levels of mRNA for DsaNIA1 are present in ammonia-grown cells. DsaNIA1 is a nitrate-and nitrite-inducible gene. Using spectrofluorometric assays with NO-sensitive fluorescence dye, we demonstrate nitrite-dependent NO synthesis by D. salina cells. Moreover, we found that the transcription of DsaNIA1 , but not DsaNIA2 , is under the inducing influence of NO-dependent pathway. Together, our data argue for the two differently regulated NR isoforms in D. salina .
{"title":"Second nitrate reductase of Dunaliella salina: functional redundancy or greater?","authors":"Z. Zalutskaya, Sofia Korkina, E. Ermilova","doi":"10.21685/1680-0826-2023-17-1-2","DOIUrl":"https://doi.org/10.21685/1680-0826-2023-17-1-2","url":null,"abstract":"nitrate reductase (NR), which governs the reduction of nitrate to nitrite. The unicellular green alga Dunaliella salina is a special case, as its cells have two NRs. This makes D. salina attractive to study the mechanisms underlying the nitrate assimilation in photosynthetic unicellular organisms. Here we characterize the expression of the gene encoding the second NR, named as DsaNIA1 . Low levels of mRNA for DsaNIA1 are present in ammonia-grown cells. DsaNIA1 is a nitrate-and nitrite-inducible gene. Using spectrofluorometric assays with NO-sensitive fluorescence dye, we demonstrate nitrite-dependent NO synthesis by D. salina cells. Moreover, we found that the transcription of DsaNIA1 , but not DsaNIA2 , is under the inducing influence of NO-dependent pathway. Together, our data argue for the two differently regulated NR isoforms in D. salina .","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67895516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21685/1680-0826-2022-16-1-1
Y. Shɨshkin, Daria Drachko, Vasily V. Zlatogursky
A new species of centrohelid heliozoans Pterocystis infundibula sp. n. from the Gulf of Aqaba (Israel) was studied with light and electron microscopy. The cell diameter is 10.53–19.03 (average 13.73) µm. P. infundibula has scales of two distinct types. Plate scales are 1.99–3.02 (av. 2.53) × 1.10–1.54 (av. 1.35) µm in size, flat, oval or slightly ovoid with an axial thickening. Spine scales are 1.39–5.22 (av. 2.88) µm long, with a funnel-shaped base, which is indistinctly continuous with a shaft, demonstrating gradual levels of reduction to the extent of the complete absence. Spine scales are fenestrated with holes of irregular shape and have a thin marginal border. The cells are floating or attached to the substratum, sometimes in aggregates of 2-5 cells. The similarities with and differences from other Pterocystis spp. as well as other centrohelids are discussed.
{"title":"Pterocystis infundibula sp. n. (Pterocystidae, Pterocystida, Centroplasthelida) – the new species of centrohelid heliozoans from the Gulf of Aqaba, Israel","authors":"Y. Shɨshkin, Daria Drachko, Vasily V. Zlatogursky","doi":"10.21685/1680-0826-2022-16-1-1","DOIUrl":"https://doi.org/10.21685/1680-0826-2022-16-1-1","url":null,"abstract":"A new species of centrohelid heliozoans Pterocystis infundibula sp. n. from the Gulf of Aqaba (Israel) was studied with light and electron microscopy. The cell diameter is 10.53–19.03 (average 13.73) µm. P. infundibula has scales of two distinct types. Plate scales are 1.99–3.02 (av. 2.53) × 1.10–1.54 (av. 1.35) µm in size, flat, oval or slightly ovoid with an axial thickening. Spine scales are 1.39–5.22 (av. 2.88) µm long, with a funnel-shaped base, which is indistinctly continuous with a shaft, demonstrating gradual levels of reduction to the extent of the complete absence. Spine scales are fenestrated with holes of irregular shape and have a thin marginal border. The cells are floating or attached to the substratum, sometimes in aggregates of 2-5 cells. The similarities with and differences from other Pterocystis spp. as well as other centrohelids are discussed.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67891123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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