Autecological investigations on marine diatoms. 5:Coscinodiscus concinnus W. Smith andRhizosolenia setigera Brightwell

1988 ◽  
Vol 22 (2) ◽  
pp. 147-155 ◽  
Author(s):  
J. W. M. Baars
Keyword(s):  
Marine Diatoms ◽  
Coscinodiscus Concinnus

On the Reproduction of some Marine Diatoms

1897 ◽  
Vol 21 ◽  
pp. 207-219 ◽  
Author(s):  
George Murray
Keyword(s):  
The Other ◽  
Marine Diatoms ◽  
Experimental Examination ◽  
A Cell ◽  
The Subject ◽  
Coscinodiscus Concinnus ◽  
Fossil Form ◽  
Marine Deposit

The subject of the production within Diatoms of spores, en docysts, &c., has been worked at by several observers, principally Castracane in recent years, and before him O'Meara and Rabenhorst. Some of these observers have noted ciliated, spore-like bodies, probably parasitic or casual intrusive organisms; others, notably Castracane, have recorded oval and other cysts winch have not been figured and the characters of which are difficult to realise. Miquel has made an experimental examination of the subject without being able to confirm Castracane's results. Castracane has also recorded the presence, as he thinks, of “gonids or embryonal forms” within a fossil Diatom (Coscinodiscus punctatus) in a marine deposit of miocene age. During March of this year I tow-netted near the Bell Rock a large quantity of Coscinodiscus concinnus — with many dead valves separated at the girdle. These frequently contained not only other and smaller individuals of the same species, but other species of diatoms and casual objects as well, and the observation makes one cautious about accepting evidence of the character brought forward by Castracane as to his fossil form.Lauder, in describing forms of Bacteriastrum and Chœtoceros, observed the formation of endocysts. “At certain times, or under certain circumstances, the endochrome does not divide after the lengthening of the frustule, but secretes a siliceous envelope and becomes a gonidium or sporangium, consisting of a cell with two rounded ends, and a connecting hoop, one end being smaller than the other ….

Diatoms in the Early Valdai (Weichselian) sediments in Lake Ladoga basin

2019 ◽  
pp. 225-228
Author(s):  
Anna V. Ludikova
Keyword(s):  
Species Diversity ◽  
High Energy ◽  
Lake Ladoga ◽  
Diatom Assemblages ◽  
Marine Diatoms ◽  
Selective Preservation

The pioneer diatom study of the Early Weichselian (Valdai) sediments in Lake Ladoga basin was performed. The specifics of the diatom assemblages (co-occurrence of ecologically incompatible taxa, poor species diversity, low diatom concentration and selective preservation) suggest that during the Early Weichselian time intense erosion of previously deposited marine Eemian (Mikulino) sediments prevailed, which resulted in re-deposition of marine diatoms. The sedimentation took place in high-energy environments unfavorable for diatom accumulation and preservation.

scholarly journals Improved biorefinery pathways of marine diatoms using a water miscible ionic liquid and its colloidal solution: efficient lipid extraction and in situ synthesis of fluorescent carbon dots for bio-imaging applications

RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21207-21215
Author(s):  
Paidi Murali Krishna ◽  
Veerababu Polisetti ◽  
Krishnaiah Damarla ◽  
Subir Kumar Mandal ◽  
Arvind Kumar
Keyword(s):  
Ionic Liquid ◽  
Colloidal Solution ◽  
Polar Solvent ◽  
Lipid Extraction ◽  
In Situ Synthesis ◽  
Marine Diatoms ◽  
Bio Imaging ◽  
Partition Method ◽  
Fluorescent Carbon Dots

In this study, a water-miscible ionic liquid (IL), 1-ethyl-3-methylimidazoliumacetate ([EMIM][Ac]), has been used for lipid extraction from marine diatoms Thalassiosira lundiana CSIR-CSMCRI 001 by following a non-polar solvent partition method.

Toxicity of copper on marine diatoms, Chaetoceros calcitrans and Nitzchia closterium from Cochin estuary, India

Ecotoxicology ◽  
2021 ◽  
Author(s):  
Kariyil Veettil Neethu ◽  
Kochukattithara Sasi Saranya ◽  
Naduvilpurakkal Gopalakrishnan Athu Krishna ◽  
Punnakkal Hari Praved ◽  
Balakrishna Pillai Aneesh ◽  
...  
Keyword(s):  
Cochin Estuary ◽  
Marine Diatoms ◽  
Chaetoceros Calcitrans

Influence of the Insecticide Diflubenzuron (Dimilin) on the Growth of Marine Diatoms and a Harpacticoid Copepod in Culture

1985 ◽  
Vol 42 (7) ◽  
pp. 1272-1277 ◽  
Author(s):  
N. J. Antia ◽  
P. J. Harrison ◽  
D. S. Sullivan ◽  
T. Bisalputra
Keyword(s):  
Skeletonema Costatum ◽  
Harpacticoid Copepod ◽  
Adult Survival ◽  
Thalassiosira Weissflogii ◽  
Marine Diatoms ◽  
Tigriopus Californicus ◽  
Per Se ◽  
Juvenile Development ◽  
Cyclotella Cryptica ◽  
Injurious Effects

Diflubenzuron (Dimilin) was tested, in the concentration range 0.1–5000 μg∙L−1, for possible injurious effects on the growth and photosynthesis of three chitin-producing (Thalassiosira weissflogii, T. norden-skioldii, Cyclotella cryptica) and one nonchitinaceous (Skeletonema costatum) diatoms. For comparison, the effects of the pesticide were also examined on adult survival and juvenile development of the harpacticoid copepod Tigriopus californicus. While the development of the copepod was hindered at concentrations of the order of 1–10 μg∙L−1, the diatoms were barely affected by Dimilin even at the highest concentration tested (5 mg∙L−1). We conclude that Dimilin acts specifically on insects and crustaceans as a larvicide by interfering with chitin deposition into cuticles during juvenile development through ecdysis. The lack of effect from Dimilin on the chitin-producing diatoms has suggested that the insecticide may not inhibit chitin biosynthesis per se as was previously believed, but that it presumably deregulates one or more of the larval postsynthetic processes responsible for chitin integration into cuticles.

Non-marine diatoms from late Wisconsin perched deltas in Taylor Valley, Antarctica

1980 ◽  
Vol 30 ◽  
pp. 157-189 ◽  
Author(s):  
Davida E. Kellogg ◽  
Minze Stuiver ◽  
Thomas B. Kellogg ◽  
George H. Denton
Keyword(s):  
Marine Diatoms ◽  
Taylor Valley
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