Thalassiosira Weissflogii
Mostrando 1-12 de 12 artigos, teses e dissertações.
-
1. Diet influence on egg production of the copepod Acartia tonsa (Dana, 1896)
A produção de ovos do copépode Acartia tonsa foi avaliada utilizando diferentes densidades das microalgas Thalassiosira weissflogii, Chaetoceros muelleri e Isochrysis galbana. Machos e fêmeas foram colocados sob condições controladas (salinidade 30, 20°C, fotoperíodo 12L:12D), aclimatados às condições experimentais e mantidos juntos por 24 h para
Anais da Academia Brasileira de Ciências. Publicado em: 2010-06
-
2. Cultivo experimental de Pseudodiaptomus acutus (Dahl, 1894) alimentados com diferentes tratamentos de microalgas
O presente estudo procura acrescentar informaÃÃes importantes sobre a biologia do Copepoda Pseudodiaptomus acutus (DAHL, 1894), como estudo da taxa de sobrevivÃncia durante ciclo de vida, quando alimentado com diferentes espÃcies de microalgas oferecidas isoladamente e suas misturas. As coletas de plÃncton foram realizadas na Ilha de Itamaracà (PE), ao
Publicado em: 2009
-
3. Coscinodiscophyceae, Fragilariophyceae e Bacillariophyceae (Achnanthales) dos rios Ivaí, São João e dos Patos, bacia hidrográfica do rio Ivaí, município de Prudentópolis, PR, Brasil
Realizou-se o levantamento florístico das Coscinodiscophyceae, Fragilariophyceae e Bacillariophyceae (Achnanthales) dos rios Ivaí, São João e dos Patos, pertencentes à bacia hidrográfica do rio Ivaí, município de Prudentópolis, Paraná. Quarenta e uma amostras foram coletadas em março, junho e julho/2002 e janeiro/2003, e analisadas. As coletas fit
Acta Botanica Brasilica. Publicado em: 2007-06
-
4. INFLUÊNCIA DA TEMPERATURA, SALINIDADE E NUTRIENTES DISSOLVIDOS (N e P) NO CULTIVO DE MICROALGAS DE ÁGUA ESTUARINA E COSTEIRA. / INFLUÊNCIA DA TEMPERATURA, SALINIDADE E NUTRIENTES DISSOLVIDOS (N e P) NO CULTIVO DE MICROALGAS DE ÁGUA ESTUARINA E COSTEIRA.
The development of commercial microencapsulated food has contributed to the feeding management of crustacean, mussel and fish larvae. However, the use of microalgae in natura is still essential for the high quality production of cultivated organisms. Microalgae have been employed not only in direct feeding but also indirectly, as for zooplankton production a
Publicado em: 2007
-
5. Rapid Evolution of a Sexual Reproduction Gene in Centric Diatoms of the Genus Thalassiosira
Sexual reproduction is commonly assumed to occur in the vast majority of diatoms due to the intimate association of this process with cell size control. Surprisingly, however, little is known about the impact of sexual events on diatom population dynamics. The Sig1 gene is strongly upregulated during sexual reproduction in the centric diatom Thalassiosira we
American Society for Microbiology.
-
6. Regulation of Carbonic Anhydrase Expression by Zinc, Cobalt, and Carbon Dioxide in the Marine Diatom Thalassiosira weissflogii1
TWCA1 is the major Zn-requiring isoform of carbonic anhydrase (CA) in the marine diatom Thalassiosira weissflogii. We have examined the roles that trace metals and CO2 play in the regulation of TWCA1 expression over ranges of concentrations that bracket those encountered in the marine environment. Both steady-state levels of TWCA1 and the kinetics of inducti
American Society of Plant Physiologists.
-
7. A biological function for cadmium in marine diatoms
The oceanic distribution of cadmium follows closely that of major algal nutrients such as phosphate. The reasons for this “nutrient-like” distribution are unclear, however, because cadmium is not generally believed to have a biological function. Herein, we provide evidence of a biological role for Cd in the marine diatom Thalassiosira weissflogii under c
The National Academy of Sciences.
-
8. Differential Effects of Nitrogen Limitation on Photosynthetic Efficiency of Photosystems I and II in Microalgae.
The effects of nitrogen starvation on photosynthetic efficiency were examined in three unicellular algae by measuring changes in the quantum yield of fluorescence with a pump-and-probe method and thermal efficiency (i.e. the percentage of trapped energy stored photochemically) with a pulsed photoacoustic method together with the inhibitor 3-(3,4-dichlorophen
-
9. Identification of a New Gene Family Expressed during the Onset of Sexual Reproduction in the Centric Diatom Thalassiosira weissflogii
An intriguing feature of the diatom life cycle is that sexual reproduction and the generation of genetic diversity are coupled to the control of cell size. A PCR-based cDNA subtraction technique was used to identify genes that are expressed as small cells of the centric diatom Thalassiosira weissflogii initiate gametogenesis. Ten genes that are up-regulated
American Society for Microbiology.
-
10. Physiological and Biochemical Response of the Photosynthetic Apparatus of Two Marine Diatoms to Fe Stress.
Flavodoxin is a small electron-transfer protein capable of replacing ferredoxin during periods of Fe deficiency. When evaluating the suitability of flavodoxin as a diagnostic indicator for Fe limitation of phytoplankton growth, we examined its expression in two marine diatoms we cultured using trace-metal-buffered medium. Thalassio-sira weissflogii and Phaeo
-
11. The Role of the C4 Pathway in Carbon Accumulation and Fixation in a Marine Diatom1
The role of a C4 pathway in photosynthetic carbon fixation by marine diatoms is presently debated. Previous labeling studies have shown the transfer of photosynthetically fixed carbon through a C4 pathway and recent genomic data provide evidence for the existence of key enzymes involved in C4 metabolism. Nonetheless, the importance of the C4 pathway in photo
American Society of Plant Biologists.
-
12. Phytochelatin production by marine phytoplankton at low free metal ion concentrations: laboratory studies and field data from Massachusetts Bay.
Phytochelatins are small metal-binding polypeptides synthesized by algae in response to high metal concentrations. Using a very sensitive HPLC method, we have quantified phytochelatins from phytoplankton in laboratory cultures at environmentally relevant metal concentrations and in marine field samples. Intracellular concentrations of phytochelatin, in the d