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Journal articles on the topic 'Teleaulax'

Author: Grafiati

Published: 2 July 2021

Last updated: 6 February 2022

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1

Nishitani, Goh, Satoshi Nagai, Katsuhisa Baba, Susumu Kiyokawa, Yuki Kosaka, Kazuyoshi Miyamura, Tetsuya Nishikawa, Kiyonari Sakurada, Akiyoshi Shinada, and Takashi Kamiyama. "High-Level Congruence of Myrionecta rubra Prey and Dinophysis Species Plastid Identities as Revealed by Genetic Analyses of Isolates from Japanese Coastal Waters." Applied and Environmental Microbiology 76, no. 9 (March 19, 2010): 2791–98. http://dx.doi.org/10.1128/aem.02566-09.

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ABSTRACT We analyzed cryptophyte nucleomorph 18S rRNA gene sequences retained in natural Myrionecta rubra cells and plastid 16S rRNA gene and psbA sequences retained in natural cells of several Dinophysis species collected from Japanese coastal waters. A total of 715 nucleomorph sequences obtained from 134 M. rubra cells and 564 plastid 16S rRNA gene and 355 psbA sequences from 71 Dinophysis cells were determined. Almost all sequences in M. rubra and Dinophysis spp. were identical to those of Teleaulax amphioxeia, suggesting that M. rubra in Japanese coastal waters preferentially ingest T. amphioxeia. The remaining sequences were closely related to those of Geminigera cryophila and Teleaulax acuta. Interestingly, 37 plastid 16S rRNA gene sequences, which were different from T. amphioxeia and amplified from Dinophysis acuminata and Dinophysis norvegica cells, were identical to the sequence of a D. acuminata cell found in the Greenland Sea, suggesting that a widely distributed and unknown cryptophyte species is also preyed upon by M. rubra and subsequently sequestered by Dinophysis. To confirm the reliability of molecular identification of the cryptophyte Teleaulax species detected from M. rubra and Dinophysis cells, the nucleomorph and plastid genes of Teleaulax species isolated from seawaters were also analyzed. Of 19 isolates, 16 and 3 clonal strains were identified as T. amphioxeia and T. acuta, respectively, and no sequence variation was confirmed within species. T. amphioxeia is probably the primary source of prey for M. rubra in Japanese coastal waters. An unknown cryptophyte may serve as an additional source, depending on localities and seasons.

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2

Qiu, Dajun, Liangmin Huang, and Senjie Lin. "Cryptophyte farming by symbiotic ciliate host detected in situ." Proceedings of the National Academy of Sciences 113, no. 43 (October 10, 2016): 12208–13. http://dx.doi.org/10.1073/pnas.1612483113.

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Protist–alga symbiosis is widespread in the ocean, but its characteristics and function in situ remain largely unexplored. Here we report the symbiosis of the ciliate Mesodinium rubrum with cryptophyte cells during a red-tide bloom in Long Island Sound. In contrast to the current notion that Mesodinium retains cryptophyte chloroplasts or organelles, our multiapproach analyses reveal that in this bloom the endosymbiotic Teleaulax amphioxeia cells were intact and expressing genes of membrane transporters, nucleus-to-cytoplasm RNA transporters, and all major metabolic pathways. Among the most highly expressed were ammonium transporters in both organisms, indicating cooperative acquisition of ammonium as a major N nutrient, and genes for photosynthesis and cell division in the cryptophyte, showing active population proliferation of the endosymbiont. We posit this as a “Mesodinium-farming-Teleaulax” relationship, a model of protist–alga symbiosis worth further investigation by metatranscriptomic technology.

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3

Kim, Jong Im, Hwan Su Yoon, Gangman Yi, Hyung Seop Kim, Wonho Yih, and Woongghi Shin. "The Plastid Genome of the Cryptomonad Teleaulax amphioxeia." PLOS ONE 10, no. 6 (June 5, 2015): e0129284. http://dx.doi.org/10.1371/journal.pone.0129284.

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4

Hernández-Urcera, Jorge, Pilar Rial, María García-Portela, Patricia Lourés, Jane Kilcoyne, Francisco Rodríguez, Amelia Fernández-Villamarín, and Beatriz Reguera. "Notes on the Cultivation of Two Mixotrophic Dinophysis Species and Their Ciliate Prey Mesodinium rubrum." Toxins 10, no. 12 (December 1, 2018): 505. http://dx.doi.org/10.3390/toxins10120505.

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Kleptoplastic mixotrophic species of the genus Dinophysis are cultured by feeding with the ciliate Mesodinium rubrum, itself a kleptoplastic mixotroph, that in turn feeds on cryptophytes of the Teleaulax/Plagioselmis/Geminigera (TPG) clade. Optimal culture media for phototrophic growth of D. acuminata and D. acuta from the Galician Rías (northwest Spain) and culture media and cryptophyte prey for M. rubrum from Huelva (southwest Spain) used to feed Dinophysis, were investigated. Phototrophic growth rates and yields were maximal when D. acuminata and D. acuta were grown in ammonia-containing K(-Si) medium versus f/2(-Si) or L1(-Si) media. Dinophysis acuminata cultures were scaled up to 18 L in a photobioreactor. Large differences in cell toxin quota were observed in the same Dinophysis strains under different experimental conditions. Yields and duration of exponential growth were maximal for M. rubrum from Huelva when fed Teleaulax amphioxeia from the same region, versus T. amphioxeia from the Galician Rías or T. minuta and Plagioselmis prolonga. Limitations for mass cultivation of northern Dinophysis strains with southern M. rubrum were overcome using more favorable (1:20) Dinophysis: Mesodinium ratios. These subtleties highlight the ciliate strain-specific response to prey and its importance to mass production of M. rubrum and Dinophysis cultures.

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5

Nagasaki, Keizo, Jin-Joo Kim, Yuji Tomaru, Yoshitake Takao, and Satoshi Nagai. "Isolation and characterization of a novel virus infecting Teleaulax amphioxeia (Cryptophyceae)." Plankton and Benthos Research 4, no. 3 (2009): 122–24. http://dx.doi.org/10.3800/pbr.4.122.

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6

Fiorendino, James M., Juliette L. Smith, and Lisa Campbell. "Growth response of Dinophysis, Mesodinium, and Teleaulax cultures to temperature, irradiance, and salinity." Harmful Algae 98 (September 2020): 101896. http://dx.doi.org/10.1016/j.hal.2020.101896.

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7

Altenburger, A., H. E. Blossom, L. Garcia-Cuetos, H. H. Jakobsen, J. Carstensen, N. Lundholm, P. J. Hansen, Ø. Moestrup, and L. Haraguchi. "Dimorphism in cryptophytes—The case of Teleaulax amphioxeia/Plagioselmis prolonga and its ecological implications." Science Advances 6, no. 37 (September 2020): eabb1611. http://dx.doi.org/10.1126/sciadv.abb1611.

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Growing evidence suggests that sexual reproduction might be common in unicellular organisms, but observations are sparse. Limited knowledge of sexual reproduction constrains understanding of protist ecology. Although Teleaulax amphioxeia and Plagioselmis prolonga are common marine cryptophytes worldwide, and are also important plastid donors for some kleptoplastic ciliates and dinoflagellates, the ecology and development of these protists are poorly known. We demonstrate that P. prolonga is the haploid form of the diploid T. amphioxeia and describe the seasonal dynamics of these two life stages. The diploid T. amphioxeia dominates during periods of high dissolved inorganic nitrogen (DIN) and low irradiance, temperature, and grazing (winter and early spring), whereas the haploid P. prolonga becomes more abundant during the summer, when DIN is low and irradiance, temperature, and grazing are high. Dimorphic sexual life cycles might explain the success of this species by fostering high genetic diversity and enabling endurance in adverse conditions.

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8

Park, Hee Won, Hyung Seop Kim, and Soo-Gun Jo. "Growth Performance of the Rotifer Brachionus plicatilus and the Larvae of Two Bivalves Fed on the Cryptophyte Teleaulax amphioxeia." Korean Journal of Fisheries and Aquatic Sciences 49, no. 3 (June 30, 2016): 351–58. http://dx.doi.org/10.5657/kfas.2016.0351.

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9

Laza-Martínez, Aitor, Jon Arluzea, Irati Miguel, and Emma Orive. "Morphological and molecular characterization of Teleaulax gracilis sp. nov. and T. minuta sp. nov. (Cryptophyceae)." Phycologia 51, no. 6 (November 2012): 649–61. http://dx.doi.org/10.2216/11-044.1.

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10

Lee, Bae Ik, Shin Kwon Kim, Jong Hyeok Kim, Hyung Seop Kim, Jong Im Kim, Woongghi Shin, Jung-Rae Rho, and Wonho Yih. "Intraspecific variations in macronutrient, amino acid, and fatty acid composition of mass-cultured Teleaulax amphioxeia (Cryptophyceae) strains." ALGAE 34, no. 2 (June 15, 2019): 163–75. http://dx.doi.org/10.4490/algae.2019.34.6.4.

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11

Rial, Pilar, José Luis Garrido, David Jaén, and Francisco Rodríguez. "Pigment composition in three Dinophysis species (Dinophyceae) and the associated cultures of Mesodinium rubrum and Teleaulax amphioxeia." Journal of Plankton Research 35, no. 2 (December 23, 2012): 433–37. http://dx.doi.org/10.1093/plankt/fbs099.

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12

Hamilton, Maria, Gwenn M. M. Hennon, Rhonda Morales, Joseph Needoba, Tawnya D. Peterson, Megan Schatz, Jarred Swalwell, E. Virginia Armbrust, and Francois Ribalet. "Dynamics of Teleaulax-like cryptophytes during the decline of a red water bloom in the Columbia River Estuary." Journal of Plankton Research 39, no. 4 (May 11, 2017): 589–99. http://dx.doi.org/10.1093/plankt/fbx029.

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13

Janson, Sven. "Molecular evidence that plastids in the toxin-producing dinoflagellate genus Dinophysis originate from the free-living cryptophyte Teleaulax amphioxeia." Environmental Microbiology 6, no. 10 (October 2004): 1102–6. http://dx.doi.org/10.1111/j.1462-2920.2004.00646.x.

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14

Kim, Hyung Seop, Jong Hyeok Kim, Soo‐Gun Jo, Jung‐Rae Rho, and Wonho Yih. "Amino acids and fatty acids composition in mass‐cultured Teleaulax amphioxeia strains with notable potential for rotifer ( Brachionus plicatilis ) enrichment." Journal of the World Aquaculture Society 51, no. 3 (May 3, 2020): 712–28. http://dx.doi.org/10.1111/jwas.12698.

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15

Gaillard, Sylvain, Aurélie Charrier, Florent Malo, Liliane Carpentier, Gaël Bougaran, Hélène Hégaret, Damien Réveillon, Philipp Hess, and Véronique Séchet. "Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora) 1." Journal of Phycology 56, no. 3 (March 9, 2020): 775–83. http://dx.doi.org/10.1111/jpy.12977.

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16

Jiang, H., and MD Johnson. "Swimming behavior of cryptophyte prey affects prey preference of the ambush-feeding ciliate Mesodinium rubrum." Aquatic Microbial Ecology 86 (May 6, 2021): 169–84. http://dx.doi.org/10.3354/ame01964.

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The mixotrophic ciliate Mesodinium rubrum is an ambush feeder relying on cryptophyte prey motility for prey encounter and perception; therefore, cryptophyte species-specific swimming behaviors affect M. rubrum’s prey preference. Here, a high-speed microscale imaging system was used to quantify the swimming behaviors of 3 cryptophyte species (Teleaulax amphioxeia, Storeatula major, and Guillardia theta) and to conduct quantitative microvideography of M. rubrum-T. amphioxeia predator-prey interaction. T. amphioxeia, a preferred prey of M. rubrum, swam at path-averaged speeds of 155 ± 73 µm s-1 along rather straight paths. In contrast, S. major regularly tumbled slowly downward or upward at 64 ± 16 µm s-1, while G. theta moved slowly in looped/curved trajectories at 57 ± 15 µm s-1; neither supports M. rubrum growth. Only while motionlessly sinking passively did M. rubrum detect and initiate an attack on swimming T. amphioxeia at reaction distances of 8.2 ± 8.2 µm. It seemed that M. rubrum needed to use oral tentacles to initially poke T. amphioxeia’s ventral posterior part and subsequently poke the prey multiple times in a short duration to compromise the prey’s escape ability, presumably by discharging extrusomes into the prey. T. amphioxeia also responded to nearby predators by switching to tumbling similar to S. major in normal swimming, suggesting an effective anti-predator defense behavior that prevents M. rubrum from accurately poking the prey’s ventral posterior part. T. amphioxeia swimming at significantly higher speeds leads to sufficiently high prey encounters and hydrodynamic signals for M. rubrum, thereby partially explaining M. rubrum’s ability to select T. amphioxeia prey.

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17

Yoo, Yeong Du, Kyeong Ah Seong, Hae Jin Jeong, Wonho Yih, Jung-Rae Rho, Seung Won Nam, and Hyung Seop Kim. "Mixotrophy in the marine red-tide cryptophyte Teleaulax amphioxeia and ingestion and grazing impact of cryptophytes on natural populations of bacteria in Korean coastal waters." Harmful Algae 68 (September 2017): 105–17. http://dx.doi.org/10.1016/j.hal.2017.07.012.

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18

Kang, Hye-Eun, Tae-Ho Yoon, Sunyoung Yoon, Hak Jun Kim, Hyun Park, Chang-Keun Kang, and Hyun-Woo Kim. "Genomic analysis of red-tide water bloomed with Heterosigma akashiwo in Geoje." PeerJ 6 (May 29, 2018): e4854. http://dx.doi.org/10.7717/peerj.4854.

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Microbial community structures of harmful algal bloom (HAB) caused by Heterosigma akashiwo in Geoje were analyzed using the MiSeq platform. To analyze phytoplankton communities without cross-reactivity with predominant bacteria, a new phytoplankton-specific 23S universal primer set was designed by modifying two previously used ones. The new universal primer set turned out to be a useful tool for the analysis of the phytoplankton community; it showed a high specificity for phytoplankton without cross-reactivity to bacterial sequences as well as the wide taxon coverage presenting from prokaryotic cyanobacteria to eukaryotic algae. Next Generation Sequencing (NGS) data generated by two universal primer sets (16S and 23S) provided useful information about the H. akashiwo bloom. According to the 23S universal primer set, proportions of H. akashiwo increased by more than 200-fold as the bloom occurred and its numbers were high enough to detect in control sites. Its operational taxonomic units (OTUs) were detected in the bloom sites at low proportions suggesting that the 16S universal primer set may not be as effective for monitoring harmful algal blooming (HAB) as the 23S universal primer set. In addition, several abundant OTUs in Chlorophyta were not presented by the 16S universal primer set in this study. However, the 16S primer set was useful for detecting decreases in Foraminifera as HAB occurred suggesting that genomic analyses using two universal primer sets would provide more reliable data for understanding microbial community changes by various environmental or ecological events, including HAB. Genomic analyses using two universal primer sets was also useful for determining a correlation between microbial components as HAB occurred. Heterosigma akashiwo was positively correlated with other bloom species, including Karenia mikimotoi, Teleaulax amphioxeia, and bacteria in Verrucomicrobia.

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19

De Lima, Artemilson Alves. "A PRODUÇÃO DE TELEAULAS NO PROCEFET: MÉTODOS, ABORDAGENS E VIVÊNCIAS." HOLOS 2 (November 17, 2008): 94. http://dx.doi.org/10.15628/holos.2008.197.

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RESUMO Este artigo discute o processo de produção de teleaulas do PROCEFET (Programa de Iniciação Tecnológica e Cidadania do CEFET/RN). O foco principal da discussão é refletir sobre alguns aspectos relevantes da experiência de produção das teleaulas no ano de 2005, tais como: os métodos; a abordagem didático-pedagógica; algumas vivências do processo de produção; as dificuldades e facilidades desse processo e, por fim, apontar, parcialmente, algumas conclusões que possam servir para o aprofundamento da reflexão, bem como indicadores de futuros trabalhos sobre a temática. PALAVRAS-CHAVE: Tecnologias da Informação e da comunicação; Teleaulas; Procefet;

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20

Herfort, Lydie, Katie Maxey, Ian Voorhees, Holly M. Simon, Kolette Grobler, Tawnya D. Peterson, and Peter Zuber. "Use of Highly Specific Molecular Markers Reveals Positive Correlation between Abundances of Mesodinium cf. major and Its Preferred Prey, Teleaulax amphioxeia, During Red Water Blooms in the Columbia River Estuary." Journal of Eukaryotic Microbiology 64, no. 6 (April 7, 2017): 740–55. http://dx.doi.org/10.1111/jeu.12407.

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21

Machado, Érica Cristina. "Revisando e Aprendendo através da Teleaula." Cadernos de Gestão e Empreendedorismo 2, no. 2 (August 31, 2014): 43–58. http://dx.doi.org/10.32888/cge.v2i2.12655.

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O presente projeto visa a implementação com o uso de tecnologia, a fim de aumentar os resultados da Escola. De forma a fazer com que a aprendizagem e/ou reaprendizagem não esteja restrito ao Espaço Escolar. Para que o objetivo seja cumprido, vamos oferecer através de um site criado na internet para este fim, tele aulas nas disciplinas de maior dificuldade entre os alunos. Estas aulas serão gravadas pelos próprios professores das disciplinas e catalogadas por assunto e conteúdo abordado. A divulgação das mesmas será realizada através de panfletos, cartazes, murais e professores, assim como pelos alunos representantes.

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22

Da Silva, Manoel Carlos Neri. "ENFERMAGEM NÃO SE ENSINA A DISTÂNCIA." Enfermagem em Foco 7, no. 2 (August 10, 2016): 6. http://dx.doi.org/10.21675/2357-707x.2016.v7.n2.802.

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A Enfermagem é uma profissão de assistência direta ao paciente, presente na vida de recém-nascidos, crianças, adolescentes, adultos e idosos. Os conhecimentos teórico-práticos necessários à formação de enfermeiros e de técnicos em Enfermagem envolvem práticas sociais, éticas e legais, que se processam pelo ensino e assistência. Não são passíveis de aquisição via teleaulas, porque o cuidado não é virtual. É real, tangível, tem corpo e forma.

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23

Baquero, Rute Vivian Angelo, and Ivete Manetzeder Keil. "ENSINANDO POLITICA.UMA ANÁLISE DO TELECURSO 2000." Revista Debates 1, no. 1 (December 6, 2007): 83. http://dx.doi.org/10.22456/1982-5269.2474.

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O artigo problematiza o discurso do poder presente nas teleaulas do Programa de História de 1ºGrau do Telecurso 2000, veiculado pela Rede Globo de Televisão, buscando registrar alguns dos pontos que influenciam a produção de sujeitos e suas visões de mundo. Neste contexto, destaca a televisão como um espaço de aprendizagem que privilegia um ensino de história despolitizado. O programa de História do 1º Grau do Telecurso 2000, ao não apresentar uma História crítica e despolitizar os fatos apresentados, produz um mundo artificial que se torna palco para a ação e o discurso dos dominadores.

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24

Saldanna, L. C. D. "A Linguagem nas Teleaulas: Limites e Possibilidades do Diálogo Pedagógico em EaD." Impulso 23, no. 57 (August 31, 2013): 41–47. http://dx.doi.org/10.15600/2236-9767/impulso.v23n57p41-47.

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25

De Camargo Cortelazzo, Iolanda Bueno. "Tutoria e autoria: novas funções provocando novos desafios na educação a distância DOI: 10.5585/EccoS.v10i2.1480." EccoS – Revista Científica 10, no. 2 (December 1, 2008): 307–26. http://dx.doi.org/10.5585/eccos.n2.1480.

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Este texto apresenta algumas das funções dos professores em cursos de licenciatura a distância de uma sede para pólos de apoio presencial em todo o País. Para manter uma unidade nas disciplinas, os professores, como autores, escrevem o livro didático e o material de aprendizagem da Web em linguagem dialógica com orientação para o estudo individual. Desenham atividades que fazem os alunos interagirem entre si, independentemente de gênero, raça e idade. Como regentes de aula, os professores interagem com os alunos via 0800, quando ministram a teleaula no estúdio. Como tutores do conhecimento, falam na Web Radio e participam dos chats. Como tutores locais, há professores que interagem e motivam os alunos nos pólos. Quando ensinam no estúdio, chegando até os alunos via satélite ou quando conversam via telefone ou via Internet, os professores instigam os alunos a formação de equipes, desenvolvendo trabalho e atitudes colaborativas.

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De Camargo Cortelazzo, Iolanda Bueno. "Tutoria e autoria: novas funções provocando novos desafios na educação a distância." EccoS – Revista Científica 10, no. 2 (December 1, 2008): 307–26. http://dx.doi.org/10.5585/eccos.v10i2.1480.

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Este texto apresenta algumas das funções dos professores em cursos de licenciatura a distância de uma sede para pólos de apoio presencial em todo o País. Para manter uma unidade nas disciplinas, os professores, como autores, escrevem o livro didático e o material de aprendizagem da Web em linguagem dialógica com orientação para o estudo individual. Desenham atividades que fazem os alunos interagirem entre si, independentemente de gênero, raça e idade. Como regentes de aula, os professores interagem com os alunos via 0800, quando ministram a teleaula no estúdio. Como tutores do conhecimento, falam na Web Radio e participam dos chats. Como tutores locais, há professores que interagem e motivam os alunos nos pólos. Quando ensinam no estúdio, chegando até os alunos via satélite ou quando conversam via telefone ou via Internet, os professores instigam os alunos a formação de equipes, desenvolvendo trabalho e atitudes colaborativas.

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Moran, José Manuel. "Modelos e avaliação do ensino superior a distância no Brasil." ETD - Educação Temática Digital 10, no. 2 (October 7, 2009): 54. http://dx.doi.org/10.20396/etd.v10i2.977.

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O Brasil se encontra em uma fase de consolidação da educação a distância em todos os setores e níveis de ensino. Depois de uma fase de experimentação, onde houve uma aprendizagem intensa e busca de modelos mais adequados para cada instituição, nos encontramos em uma fase de amadurecimento, de maior regulação governamental, de maior cuidado com o crescimento, a infra-estrutura, a metodologia de ensino, a avaliação. Os modelos predominantes são os de teleaula, videoaula e WEB com maior ou menor apoio local. A legislação atual no Brasil privilegia o modelo semi-presencial, com acompanhamento dos alunos perto de onde moram (em pólos) e mostra desconfiança pelo modelo de acompanhamento online, principalmente em cursos de graduação. A educação a distância está se transformando, de uma modalidade complementar ou especial para situações específicas, em referência importante para uma mudança profunda do ensino superior como um todo. Este utilizará cada vez mais metodologias semi-presenciais, flexibilizando a necessidade de presença física, reorganizando os espaços e tempos de ensino e aprendizagem.

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Araújo, André Luis Calado. "Editorial." HOLOS 2 (December 26, 2007): 3. http://dx.doi.org/10.15628/holos.2008.8.

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O CEFET-RN apresenta a segunda edição da Holos de 2008. A revista se consolida com multidisciplinar com 8 artigos. Com esta edição completamos cinco anos no formato online e a décima quarta edição, mostrando que o periódico se consolida como alternativa à publicação de trabalhos científicos. O primeiro artigo intitulado “O façonismo no espaço urbano de Americana-SP”, discute o espaço urbano, a diversidade cultural e sua dinamicidade. O objetivo deste trabalho foi fazer uma análise da atividade façonista e sua repercussão na formação e crescimento urbano de Americana-SP. É uma contribuição externa do Programa de Pós-graduação da UNESP. O segundo trata das “Interfaces entre saúde, lazer e educação: reflexões prática corporais”. Os autores objetivam com esse estudo tecer reflexões sobre interfaces entre saúde, lazer e educação, apontando contribuições das práticas corporais na atuação do profissional de lazer e qualidade de vida enquanto educador. A contribuição é proveniente do Departamento de Serviços da Unidade SEDE do CEFET-RN. Em seguida vem o artigo “Das perspectivas técnicas e supra-orgânicas às representações: breves reflexões sobre abordagens geográficas acerca da cultura”. O autor reflete sobre a evolução das abordagens geográficas acerca da cultura. A contribuição é originaria de Programa de Pós-graduação em Geografia da UFRN. O quarto artigo “Banco de dados geográficos no Spring visando a análise geoambiental do Seridó” apresenta um banco de dados estruturado em BDG (Banco de Dado Georreferenciado) com potencialidade de integrar e analisar, numa única base de dados, informações espaciais e não-espaciais provenientes de vários tipos e escalas e realizar uma análise preliminar geoambiental da área de estudo. O artigo é uma cooperação entre pesquisadores do CEFET-RN e do Curso de Geologia da UFRN. O quinto artigo destaca os “Impactos da irrigação na variabilidade espacial e temporal da salinidade de um solo aluvial no Semi-Árido Potiguar. O artigo é proveniente de cooperação entre um pesquisador do CEFET-RN e do Programa de doutorado em Engenharia Química da UFRN. O sexto artigo, a “Influência da carcinicultura sobre a salinização do solo em áreas do município de Guamaré/RN” trata da acentuada instabilidade morfológica ocasionada, principalmente, pela influência de atividades antrópicas como a carcinicultura e a salineira. O artigo é fruto de trabalho de pesquisa cooperativa entre o Departamento de Recursos Naturais do CEFET-RN e o Curso de Química da UFRN. Em seguida o artigo “A prática pedagógica do ensino de educação ambiental nas escolas públicas de João Câmara – RN” discute a inserção de conteúdos ambientais no município de João Câmara e como estes é problematizado no processo ensino aprendizagem. O artigo foi desenvolvido por pesquisadores do Departamento de Recursos Naturais da Unidade SEDE do CEFET-RN. O último artigo destaca “A produção de teleaulas no PROCEFET: métodos, abordagens e vivências. Este objetiva refletir sobre alguns aspectos relevantes da experiência de produção das teleaulas no ano de 2005. O autor é docente do Departamento de Formação de Professores da Unidade SEDE do CEFET-RN. Agora os convidamos a aprofundar a leitura nos artigos de vosso interesse. Boa leitura.

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Flores, Raúl Calixto, and Angélica María Rebollar Albarrán. "La Telesecundaria, ante la sociedad del conocimiento." Revista Iberoamericana de Educación 44, no. 7 (January 10, 2008): 1–11. http://dx.doi.org/10.35362/rie4472187.

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En México, el uso de la televisión en educación se hizo evidente con la experiencia de Telesecundaria (1966); teleaulas para la enseñanza en regiones apartadas donde el acceso es difícil o bien el número de alumnos es excesivamente pequeño como para plantearse la construcción de una escuela y el mantenimiento de una plantilla docente. La programación es preestablecida y controlada, considerándose el medio televisión como un recurso didáctico de gran valor para atender a estas poblaciones en cierto modo marginadas. La experiencia en el uso de la televisión se genera en Latinoamérica en la década de los 60 principalmente, lo cual permite identificar que México no quedó al margen de tan significativos avances, pues a partir de esa década, es cuando nace la experiencia que se analiza en el presente artículo. La telesecundaria hoy en día es un subsistema con grandes logros, pero también con enormes retos y sobre todo con graves deficiencias, que desafortunadamente no han sido estudiadas ni atendidas acertadamente, como se podrá ver a lo largo de este trabajo. En el caso de la telesecundaria en México se hace necesario enfatizar, que con el uso de nueva tecnología se formarán a los jóvenes para enfrentar los nuevos retos de un planeta cada vez más comunicado. En este sentido la orientación de una política educativa y tecnológica que fomente la construcción de aprendizajes con el uso de nuevas tecnologías en telesecundaria resulta fundamental.

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Łotocka, Maria. "The effect of irradiance on the xanthophyll composition of Skeletonema marinoi (Bacillariophycae), Teleaulax sp., Rhodomonas sp. (Cryptophyceae), and Heterocapsa triquetra (Dinophyceae)." Oceanological and Hydrobiological Studies 44, no. 2 (January 1, 2015). http://dx.doi.org/10.1515/ohs-2015-0017.

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AbstractThe aim of the research was to determine the effect of irradiance on the content of carotenoids in the natural algae community occurring in the Baltic Sea: diatom Skeletonema marinoi, cryptophytes Teleaulax sp., Rhodomonas sp., and dinoflagellate Heterocapsa triquetra.In the natural population of Skeletonema marinoi, the highest fucoxanthin content was observed in the morning and afternoon, unlike with diatoxanthin+diadinoxanthin, where a mean of 0.008 pg cellIn cryptophytes Teleaulax sp. and Rhodomonas sp., no carotenoids of the xanthophyll cycle were detected. The content of alloxanthin showed diurnal variation from 0.048 pg cell

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Maselli, Maira, Konstantinos Anestis, Kerstin Klemm, Per Juel Hansen, and Uwe John. "Retention of Prey Genetic Material by the Kleptoplastidic Ciliate Strombidium cf. basimorphum." Frontiers in Microbiology 12 (July 28, 2021). http://dx.doi.org/10.3389/fmicb.2021.694508.

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Many marine ciliate species retain functional chloroplasts from their photosynthetic prey. In some species, the functionality of the acquired plastids is connected to the simultaneous retention of prey nuclei. To date, this has never been documented in plastidic Strombidium species. The functionality of the sequestered chloroplasts in Strombidium species is thought to be independent from any nuclear control and only maintained via frequent replacement of chloroplasts from newly ingested prey. Chloroplasts sequestered from the cryptophyte prey Teleaulax amphioxeia have been shown to keep their functionality for several days in the ciliate Strombidium cf. basimorphum. To investigate the potential retention of prey genetic material in this ciliate, we applied a molecular marker specific for this cryptophyte prey. Here, we demonstrate that the genetic material from prey nuclei, nucleomorphs, and ribosomes is detectable inside the ciliate for at least 5 days after prey ingestion. Moreover, single-cell transcriptomics revealed the presence of transcripts of prey nuclear origin in the ciliate after 4 days of prey starvation. These new findings might lead to the reconsideration of the mechanisms regulating chloroplasts retention in Strombidium ciliates. The development and application of molecular tools appear promising to improve our understanding on chloroplasts retention in planktonic protists.

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Kim, Miran, and Myung Gil Park. "Unveiling the hidden genetic diversity and chloroplast type of marine benthic ciliate Mesodinium species." Scientific Reports 9, no. 1 (October 1, 2019). http://dx.doi.org/10.1038/s41598-019-50659-2.

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Abstract Ciliate Mesodinium species are commonly distributed in diverse aquatic systems worldwide. Among Mesodinium species, M. rubrum is closely associated with microbial food webs and red tide formation and is known to acquire chloroplasts from its cryptophyte prey for use in photosynthesis. For these reasons, Mesodinium has long received much attention in terms of ecophysiology and chloroplast evolution. Mesodinium cells are easily identifiable from other organisms owing to their unique morphology comprising two hemispheres, but a clear distinction among species is difficult under a microscope. Recent taxonomic studies of Mesodinium have been conducted largely in parallel with molecular sequence analysis, and the results have shown that the best-known planktonic M. rubrum in fact comprises eight genetic clades of a M. rubrum/M. major complex. However, unlike the planktonic Mesodinium species, little is known of the genetic diversity of benthic Mesodinium species, and to our knowledge, the present study is the first to explore this. A total of ten genetic clades, including two clades composed of M. chamaeleon and M. coatsi, were found in marine sandy sediments, eight of which were clades newly discovered through this study. We report the updated phylogenetic relationship within the genus Mesodinium comprising heterotrophic/mixotrophic as well as planktonic/benthic species. Furthermore, we unveiled the wide variety of chloroplasts of benthic Mesodinium, which were related to the green cryptophyte Chroomonas/Hemiselmis and the red cryptophyte Rhodomonas/Storeatula/Teleaulax groups.

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Armeli Minicante, Simona, Roberta Piredda, Stefania Finotto, Fabrizio Bernardi Aubry, Francesco Acri, Alessandra Pugnetti, and Adriana Zingone. "Spatial diversity of planktonic protists in the Lagoon of Venice (LTER-Italy) based on 18S rDNA." Advances in Oceanography and Limnology 11, no. 1 (June 29, 2020). http://dx.doi.org/10.4081/aiol.2020.8961.

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Transitional waters are subject to a high degree of variability in space and time. In this study, protist plankton communities of the Lagoon of Venice were compared among four sites characterised by different environmental conditions with a metabarcoding approach. High throughput sequencing (HTS) of the V4-18S rDNA fragment in 32 samples collected on four dates, from April 2016 to February 2017, produced 1,137,113 reads, which were grouped into 4,058 OTUs at 97% similarity. Bacillariophyta and Ciliophora were the most abundant groups in the entire dataset in terms of read number (27.6% and 16.6%, respectively), followed by Dinophyta (10.9%), Cryptophyceae (9.7%), and Syndiniales (6.1%). The contribution of protist groups markedly varied across the seasons, but spatial differences were also recorded in the lagoon. In April, a higher contribution of Bacillariophyta characterized St1 and 5 (68.0% and 61.1%), whereas Sts2 and 3 showed a higher percentage of Ciliophora (18.6 and 23.4%, respectively) and dinoflagellates (10.3 and 7.7%). In July, diatom blooms occurred at Sts1, 2 and 3, with some differences in the dominant species. At St2 Dinophyta reached the highest contribution of the whole sampling period in the area (30.6%), while St5 was quite distinct, with a low contribution of diatoms and a dominance of Ciliophora (34.0%) and Trebouxiophyceae (36.4%). All the stations in November were characterized by relatively high abundance of Ciliophora (21.4-51.9%). In February, diatom contribution was relevant only at St5 (29.3%), Teleaulax acuta peaked at St3 (ca. 36%), Syndiniales at St2 (38.8%) and Dictyochophyceae at St1 (24.2%). The α-diversity indexes (observed OTUs, Shannon and Pielou evenness) showed a high variability over space and time. Overall, diversity and community composition were rather similar between the intermediate and deeper Sts2 and 3 on all sampling dates whereas they at time differed between the landward and shallow Sts1 and 5. While the most marked differences occurred over the temporal scale, the depth of the station and the relatedness with the external marine coastal environment appear to play a major role in the spatial distribution of protist communities within the lagoon.

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Dallier Saldanha, Luís Cláudio. "A teleaula em questão." #Tear: Revista de Educação, Ciência e Tecnologia 2, no. 2 (December 6, 2013). http://dx.doi.org/10.35819/tear.v2.n2.a1812.

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Resumo: Este artigo analisa o modelo da teleaula na Educação a Distância, a partir da caracterização de formatos de teleaula e da identificação das possibilidades e ambiguidades da linguagem audiovisual em processos de ensino e aprendizagem que se valem de tecnologias digitais. Para isso, apontam-se os riscos e desafios da apropriação da linguagem audiovisual e dos recursos próprios da comunicação de massa na mediação pedagógica. Por outro lado, também, são apresentadas as potencialidades da teleaula e examinados os recursos que contribuem para a comunicação docente e a aprendizagem no contexto das novas mídias digitais. Palavras-chave: Educação a distância. Teleaula. Mídias digitais. TELECLASS IN QUESTION Abstract: Teleclass Model Analysis in Distance Education, starting from the characterization of teleclass formats and the identification of possibilities and ambiguities of audiovisual language within teaching and learning processes that make use of digital technologies. The risks and challenges of audiovisual language ownership are pointed out and resources belonging to mass communication in pedagogical mediation. The potential resources concerning teleclasses are also presented and examined which contribute for professor communication and learning in the new digital media context. Keywords: Distance education. Teleclass. Digital medias.

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