Journal ArticleDOI
Blue and Red Light-Induced Germination of Resting Spores in the Red-Tide Diatom Leptocylindrus danicus†
Tomoyuki Shikata,Mineo Iseki,Shigeru Matsunaga,Shoichi Higashi,Yasuhiro Kamei,Masakatsu Watanabe +5 more
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TLDR
Results suggest that the photosynthetic system is involved in the photoreception process of light‐induced germination of resting spores in the red‐tide diatom Leptocylindrus danicus.Abstract:
Photophysiological and pharmacological approaches were used to examine light-induced germination of resting spores in the red-tide diatom Leptocylindrus danicus. The equal-quantum action spectrum for photogermination had peaks at about 440 nm (blue light) and 680 nm (red light), which matched the absorption spectrum of the resting spore chloroplast, as well as photosynthetic action spectra reported for other diatoms. DCMU, an inhibitor of photosynthetic electron flow near photosystem II, completely blocked photogermination. These results suggest that the photosynthetic system is involved in the photoreception process of light-induced germination. Results of pharmacological studies of the downstream signal transduction pathway suggested that Ca(2+) influx is the closest downstream neighbor, followed by steps involving calmodulin, nitric oxide synthase, guanylyl cyclase, protein-tyrosine-phosphatase, protein kinase C and actin polymerization and translation.read more
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The Acclimation of Phaeodactylum tricornutum to Blue and Red Light Does Not Influence the Photosynthetic Light Reaction but Strongly Disturbs the Carbon Allocation Pattern
Anne Jungandreas,Anne Jungandreas,Benjamin Schellenberger Costa,Torsten Jakob,Martin von Bergen,Martin von Bergen,Sven Baumann,Sven Baumann,Christian Wilhelm +8 more
TL;DR: The results show that cultures pre-acclimated to BL and RL exhibited similar growth performance, photosynthesis rates and metabolite profiles, however, light shift experiments revealed rapid and severe changes in the metabolite profile within 15 min as the initial reaction of light acclimation.
Journal ArticleDOI
Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes
TL;DR: In this paper, the physical mechanisms of light absorption, scattering, fluorescence and diffraction in microalgae are discussed. And the current optical cell models that describe the absorbance and scattering properties of micro algae are compared and reviewed.
Journal ArticleDOI
Diversity and germination patterns of diatom resting stages at a coastal Mediterranean site
TL;DR: This first time-series analysis of a coastal seed bank demonstrates that the assemblage of viable diatoms in the sediment varies over the year, reflecting the diatom dyna mics in the water column, but also species-specific characteristics in survival capability and likely the disturbance due to biotic and abiotic factors.
Inhibition of Forskolin-induced Neurite Outgrowth and Protein Phosphorylation by a Newly Synthesized Selective Inhibitor of Cyclic AMP-dependent Protein Kinase, N-[2-(p-Bromocinnamylamino)ethyl]-5-isoquinolinesulfinamide (H-89), of PC12D Pheochromocytoma
Chijiwa,Takashi,Mishima,Atsushi,Hagiwara,Masatoshi,Sano,Mamoru,Hayashi,Kyozo,Inoue,Tsutomu,Naito,Kenji,Toshioka,Tadashi,Hidaka,Hiroyoshi +17 more
TL;DR: Kinetic analysis indicated that H-89 inhibits protein kinase A, in competitive fashion against ATP, and the forskolin- and dibutyryl cAMP-induced neurite outgrowth is apparently mediated by protein Kinase A while the NGF- induced neuriteOutgrowth is mediated by a protein kinases A-independent pathway.
Journal ArticleDOI
Light sensing and responses in marine microalgae.
TL;DR: Initial studies have revealed that some algal photoreceptors are similar to those known in plants, and new variants with different spectral tuning and algal-specific light sensors have been found, changing current views and perspectives on how photoreceptor structure and function have diversified in phototrophs experiencing different environmental conditions.
References
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Journal ArticleDOI
Genistein, a specific inhibitor of tyrosine-specific protein kinases.
Tetsu Akiyama,J Ishida,Shinsaku Nakagawa,Hiroshi Ogawara,Shinya Watanabe,N Itoh,M Shibuya,Yasuo Fukami +7 more
TL;DR: Genistein inhibited the EGF-stimulated increase in phosphotyrosine level in A431 cells and scarcely inhibited the enzyme activities of serine- and threonine-specific protein kinases such as cAMP-dependent protein kinase, phosphorylase kinases, and the Ca2+/phospholipid-dependent enzymeprotein kinase C.
Journal ArticleDOI
Staurosporine, a potent inhibitor of phospholipid/Ca++dependent protein kinase.
TL;DR: Staurosporine, microbial alkaloid which has been known to have antifungal activity was found to inhibit markedly phospholipid/Ca++dependent protein kinase (protein kinase C) from rat brain, with an IC50 value of 2.7 nM.
Journal ArticleDOI
Nitric oxide-generating vasodilators and 8-bromo-cyclic guanosine monophosphate inhibit mitogenesis and proliferation of cultured rat vascular smooth muscle cells.
Uttam Garg,Aviv Hassid +1 more
TL;DR: Results suggest that endogenous nitric oxide may function as a modulator of vascular smooth muscle cell mitogenesis and proliferation, by a cGMP-mediated mechanism.
Journal ArticleDOI
The Genome of the Diatom Thalassiosira Pseudonana: Ecology, Evolution, and Metabolism
E. Virginia Armbrust,John A. Berges,Chris Bowler,Beverley R. Green,Diego Martinez,Nicholas H. Putnam,Shiguo Zhou,Andrew E. Allen,Andrew E. Allen,Kirk E. Apt,Michael Bechner,Mark A. Brzezinski,Balbir K. Chaal,Anthony Chiovitti,Aubrey K. Davis,Mark S. Demarest,J. Chris Detter,Tijana Glavina,David Goodstein,Masood Z. Hadi,Uffe Hellsten,Mark Hildebrand,Bethany D. Jenkins,Jerzy Jurka,Vladimir V. Kapitonov,Nils Kröger,Winnie W. Y. Lau,Todd W. Lane,Frank W. Larimer,J. Casey Lippmeier,J. Casey Lippmeier,Susan Lucas,Mónica Medina,Anton Montsant,Miroslav Oborník,Miroslav Oborník,Micaela S. Parker,Brian Palenik,Gregory J. Pazour,Paul G. Richardson,Tatiana A. Rynearson,Mak A. Saito,David C. Schwartz,Kimberlee Thamatrakoln,Klaus Valentin,Assaf Vardi,Frances P. Wilkerson,Daniel S. Rokhsar +47 more
TL;DR: The 34 million-base-pair draft nuclear genome of the marine diatom Thalassiosira pseudonana and its 129 thousand-base pair plastid and 44 thousand base-pair mitochondrial genomes were reported in this article.
Journal ArticleDOI
Signaling from Rho to the actin cytoskeleton through protein kinases ROCK and LIM-kinase.
Midori Maekawa,Toshimasa Ishizaki,Shuken Boku,Naoki Watanabe,Akiko Fujita,Akihiro Iwamatsu,Takashi Obinata,Kazumasa Ohashi,Kensaku Mizuno,Shuh Narumiya +9 more
TL;DR: Results indicate that phosphorylation of LIM-kinase by ROCK and consequently increased phosphorylated of cofilin by LIM- Kinase contribute to Rho-induced reorganization of the actin cytoskeleton.
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