Cyclotella

Guillard, R. R. L., and Ryther, J. H. (1962). Studies of marine planktonic diatoms 1. Cyclotella nana Hustedt and Detonula confervacea (cleve). Canadian J. Microbiol. 8 229-239. 

Karydis M. 1980 Uptake of hydrocarbons by the marine diatom Cyclotella cryptica. Microbiological Ecology 5 287-293. 

Fig 3 Images of phytoplankton cells from the Ebro river obtained by means of epifluorescence microscopy and scanning electron microscopy. Images correspond to the species Pediastrum duplex (a), Aulacoseira granulata (b), Stephanodiscus cf. neoastraea (c), Cyclotella meneghini-nana (d), Skeletonema potamos (e), and Thalassiosira weissflogii (f)... 

Differences in chlorophyll concentrations between present and past records in the lower part of the Ebro do not correspond with significant changes in the distribution of phytoplankton assemblages. The general trends in the distribution of phytoplankton communities appear to be consistent with those reported in previous surveys, at least in the lower part of the river. Centric diatoms such as Aulacoseira granulata, Cyclotella sp. and Stephanodiscus sp. were dominant in autumn, spring, and early summer 1989-1990, while Scenedesmus sp., Coelastrum sp., and Pediastrum sp. were most abundant in the summer of that period [7]. 

Sabater S, Klee R (1990) Observaciones en diatomeas centrales del fitoplancton del rib Ebro, con especial interes en algunas pequenas Cyclotella. Diatom Res 5 141-154... 

Millie, D.F. and C.M. Hersh. 1987. Statistical characterizations of the atrazine-induced photo synthetic inhibition of Cyclotella meneghiniana (Bacillariophyta). Aquat. Toxicol. 10 239-249. 

Fig. 1. Scanning electron micrographs of diatoms prepared using the acid treatment method. Bars= 10 pm. (A) Unidentified centric diatom. (B) Interior of the frustule of Actinoptychus sp. (C) Cyclotella meneghinii. (D) Actinoptychus sp.

APHA Selenastrum capricornutum, Species-dependent Microcystis aeruginosa, between 103 and Anabaena flos-aquae, 50 X 103 Cyclotella sp. Nitzschia sp. Synedra sp. APHAb Growth rate 24 2 32-65 pmol m 2 s 1... 

Fig. 2.125. HPLC chromatograms generated at 440 nm. Pure cultures (a) Synechococcus elongatus, (b) 2 micron picosphere , (c) Cyclotella choctawatcheena. Phytoplankton field communities (d) Twin Key Basin, (e) Rabbit Key Basin, (f) Sandy Key Basin, ft = /1-carotene, Z = zeaxanthin, a = chlorophyll-a, N = myxoxanthophyll, E = echinenone, c,/c2 = chlorophylls-Cj/c2, F = fucoxanthin, Col = unknown carotenol, Cone = unknown carotenone, D = diadinoxan-thin, P = peridin. Reprinted with permission from J. W. Louda et al. [283].

Amino acids Navicula pelliculosa a b Melosira nummuloides a b Melosira granulata a b Cyclotella stelligera a b Cyclotella cryptica a b Nitzschia brevirostris a b Siliceous sponge Tissue Spicule ... 

Navicula petliculosa Melosira nummuloides Melosira granulata Cyclotella stelligera Cyclolella cryptk a Nitischia hrerirostris... 

Fig. 47. Diatom cell walls after sonication and staining with phosphotunestic acid (a) Xavicula pelliculosa (b)Nitzschia brevirostris (c d) Cyclotella cryptica (llecky et a/.548 ). Around the circumference of the large pores, where there is no underlying silica, a hi-layer membrane can be recognized with grains showing an 80 A periodicity. For discussion of this periodicity see Ref.48 ...

Paasche, E. Silicon and the ecology of marine plankton diatoms. I. Thalassiosira pseudo-nana (Cyclotella narta) grown in a chemostat with silicate as limiting nutrient. Mar. Biol. 

S31) Guillard, R. R. L., Kilham, P., and Jackson, T. A. Kinetics of silicon-limited growth in the marine diatom Thalassiosira pseudonana Hasle and Heimdal (= Cyclotella nana Hustedt). 

Note Highly purified chlorophylls a and b were purchased from a commercial source. Chlorophyll c was extracted from a fresh water species of Cyclotella. The phaeophytins were formed by acidification of the chlorophylls with hydrochloric acid. 

Lancelot C, Mathot S, Owens NJP (1986) Modelling protein synthesis, a step to an accurate estimate of net primary production the case of Phaeocystis pouchetii colonies in Belgian coastal waters. Mar Ecol Prog Ser 32 193-202 Lancelot C, Billen G, Sournia A, Weisse T, Colijin F, Veldhuis MJW, Davies A, Wassman P (1987) Phaeocystis blooms and nutrient enrichment in the continental coastal zones of the North Sea. AMBIO 16(1) 38 16 Lewandowska J, Kosakowska A (2004) Effect of iron limitation on cells of the diatom Cyclotella meneghiniana Kutzing. Oceanologia 46(2) 269-287 Lowther WT, Matthews BW (2000) Structure and function of the methionine aminopeptidases. Biochim Biophys Acta 1477 157-167... 

HeUebust, J. A. (1978). Uptake of organic substrates by Cyclotella cryptica (BacUlariophyceae) Effects of ions, ionophores and metabolic and transport inhibitors. J. Phycol. 14, 79-83. 

OHveira, L., and Antia, N. J. (1986). Some observations on the urea degrading enzyme of the diatom Cyclotella cryptica and the role of nickel in its production. J. Plankton Res. 8, 235—242. 

Figure 9. Dose response curve for CPD specific fluorescence against the UV-B dose in Cyclotella sp. cells, measured with flow cytometry. Filled circles G1 cells, open circles G2 cells. Error bars, standard deviations of the mean for G1 and G2 cells (at least 4000 cells analysed per condition/cell cycle stage). [Redrawn form Buma et al. 10.]...

A.G.J. Buma, A.H. Engelen, W.W.C. Gieskes (1997). Wavelength dependent induction of thymine dimers and growth rate reduction in the marine diatom Cyclotella sp. exposed to ultraviolet radiation. Mar. Ecol. Progr. Ser., 153,91-97. 

---