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Shubina, Larisa K.,Makarieva, Tatyana N.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Dyshlovoy, Sergey A.,von Amsberg, Gunhild,Glazunov, Valery P.,Silchenko, Artem S.,Stonik, Inna V.,Lee, Hyi-Seung NATURAL PRODUCT COMMUNICATIONS 2016 Natural product communications Vol.11 No.9
<P>As a result of the first study on secondary metabolites from the cosmopolitan bioluminescent marine tube polychaete Chaetopterus variopedatus, a new bicyclic guanidine alkaloid, 6-epi-monanchorin (1), along with the previously known monanchorin (2) were isolated. The structure of 1 was elucidated by spectroscopic and chemical methods, including a cleavage of the C-1-O-7 bond to obtain a secondary alcohol (3), which was used to determine the absolute configurations by Mosher's method. It was found that 1 and 2 were mainly accumulated in a secreted mucus special organ of the worm (food net), where green and blue-green microalgae were detected. A biosynthetic pathway to 6-epi-monanchorin and monanchorin from dietary polyenic fatty acid precursors was proposed.</P>
Robin, Y.,Evropeitsev, E. A.,Shubina, T. V.,Kirilenko, D. A.,Davydov, V. Yu.,Smirnov, A. N.,Toropov, A. A.,Eliseyev, I. A.,Bae, S. Y.,Kushimoto, M.,Nitta, S.,Ivanov, S. V.,Amano, H. The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.1
<P>Transient photoluminescence (PL) characteristics and localization phenomena in InGaN/GaN core-shell nanorods (NRs) were investigated from 6 K up to 285 K. The NRs exhibit three well-defined PL bands in the near-UV, blue, and green range ascribed to the emission of quantum well (QW) areas situated at the (1.00) sidewalls, (10.1) top facets, and (00.1) tip, respectively. At low temperature, time-resolved PL shows a fast decay time of about 0.5 ns for the semi- and non-polar QWs, while the polar QWs exhibit at least a twice-longer time. Rapid delocalization of carriers above 50 K indicates shallow potential fluctuations in the QWs. At room temperature, the characteristic fast PL decay time of the three QW bands stabilizes around 300 ps. The slow decaying PL components have different characteristic decay times that are explained by additional localization at basal stacking faults (BSFs), taking into account the quantum confined Stark effect. In addition, narrow excitonic luminescence lines are observed in the BSF-enriched polar QWs, providing direct evidence of the impact of the BSF/QW crossings on the optical properties of the NRs. A PL rise time of about 100 ps does not show any deviation between bands. These findings are suggestive of similar transport mechanisms in temperature equilibrium without inter-facet transport between different QWs. We believe that predictable transient characteristics can play a key role in creating uniform NR ensembles for device applications.</P>
Anticancer Activity of 3-Demethylubiquinone Q2. In Vivo Experiments and Probable Mechanism of Action
Fedorov, S.N.,Radchenko, O.S.,Shubina, L.K.,Balaneva, N.N.,Agafonova, I.G.,Bode, A.M.,Jin, J.-O.,Kwak, J.-Y.,Dong, Z.,Stonik, V.A. INTERNATIONAL INSTITUTE OF ANTICANCER RESEARCH 2008 Anticancer research Vol.28 No.2
Makarieva, Tatyana N.,Tabakmaher, Ksenya M.,Guzii, Alla G.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Shubina, Larisa K.,Kuzmich, Alexandra S.,Lee, Hyi-Seung,Stonik, Valentin A. American Chemical Society and American Society of 2011 Journal of natural products Vol.74 No.9
<P>New unusual polycyclic guanidine alkaloids monanchocidins B–E (<B>2</B>–<B>5</B>) along with monanchocidin A (<B>1</B>), which we recently described, were isolated from the Far-Eastern marine sponge <I>Monanchora pulchra</I>. Their structures were established using spectroscopic data and chemical transformations. Compounds <B>1</B>–<B>5</B> show potent cytotoxic activities against HL-60 human leukemia cells with IC<SUB>50</SUB> values of 540, 200, 110, 830, and 650 nM, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2011/jnprdf.2011.74.issue-9/np200452m/production/images/medium/np-2011-00452m_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np200452m'>ACS Electronic Supporting Info</A></P>