Dovi Kelman

University of Hawaii at Hilo

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Yoel Kashman

Tel Aviv University

Anthony D. Wright

University of Hawaii at Hilo

Yehuda Benayahu

Tel Aviv University

Yossi Loya

Tel Aviv University

Russell Hill

University of Maryland Center for Environmental Science

Eugene Rosenberg

Tel Aviv University

Nicole K. Tabandera

University of Hawaii at Hilo

Zvy Dubinsky

Bar-Ilan University

Yeshayahu Nitzan

Bar-Ilan University

Yael Lampert

University of Haifa

Cooperative Institutions

University of Hawaii at Hilo

Tel Aviv University

Interuniversity Institute for Marine Sciences in Eilat

Bar-Ilan University

James Cook University

University of Guam

Institute of Zoology

Australian Institute of Marine Science

University of Hawaii System

University of Hawaiʻi at Mānoa

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Papers

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Contemporary Gathering Practice and Antioxidant Benefit of Wild Seaweeds in Hawai’i

Economic Botany (2014)

Georgia Hart Tamara Ticktin Dovi Kelman Anthony D. Wright Nicole K. Tabandera

Consumption

10.1007/s12231-014-9258-7

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Citations (13)

Carotenoids provide the major antioxidant defence in the globally significant N₂‐fixing marine cyanobacterium Trichodesmium

Environmental Microbiology (2009)

Dovi Kelman Ami Ben‐Amotz Ilana Berman‐Frank

Summary Photosynthetic oxygen‐evolving microorganisms contend with continuous self‐production of molecular oxygen and reactive oxygen species. The deleterious effects of reactive oxygen species are exacerbated for cyanobacterial nitrogen‐fixers (diazotrophs) due to the innate sensitivity of nitrogenase to oxygen. This renders incompatible the processes of oxygen‐evolving photosynthesis and N‐fixation. We examined total antioxidative potential of various diazotrophic and non‐diazotrophic cyanobacteria. We focused on Trichodesmium spp., a bloom‐forming marine diazotroph that contributes significantly to global nitrogen fixation. Among the species tested, Trichodesmium possessed the highest antioxidant activity. Moreover, while proteins constituted the dominant antioxidative component of all other cyanobacteria tested, Trichodesmium was unique in that small‐molecule natural products provided the majority of antioxidant activity, while proteins constituted only 13% of total antioxidant activity. Bioassay‐guided fractionation followed by high‐performance liquid chromatography profiling of antioxidant purified fractions identified the highly potent antioxidant all‐ trans ‐β‐carotene, and small amounts of 9‐ cis ‐β‐carotene and retinyl palmitate. Search of the Trichodesmium genome identified protein sequences homologous to key enzymes in the β‐carotene to retinyl palmitate biosynthetic pathway, including 33–37% identity to lecithin retinol acyltransferase. The present study demonstrates the importance of carotenoids in Trichodesmium 's arsenal of defensive compounds against oxidative damage and protection of nitrogenase from oxygen and its radicals.

Trichodesmium

10.1111/j.1462-2920.2009.01913.x

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Citations (56)

Journal of Chemical Ecology (2000)

Dovi Kelman Yehuda Benayahu Yoel Kashman

Chemical defense

10.1023/a:1005423708904

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Citations (19)

Antioxidant Activity of Hawaiian Marine Algae

Marine Drugs (2012)

Dovi Kelman Ellen Kromkowski Posner Karla J. McDermid Nicole K. Tabandera Patrick R. Wright

Marine algae are known to contain a wide variety of bioactive compounds, many of which have commercial applications in pharmaceutical, medical, cosmetic, nutraceutical, food and agricultural industries. Natural antioxidants, found in many algae, are important bioactive compounds that play an important role against various diseases and ageing processes through protection of cells from oxidative damage. In this respect, relatively little is known about the bioactivity of Hawaiian algae that could be a potential natural source of such antioxidants. The total antioxidant activity of organic extracts of 37 algal samples, comprising of 30 species of Hawaiian algae from 27 different genera was determined. The activity was determined by employing the FRAP (Ferric Reducing Antioxidant Power) assays. Of the algae tested, the extract of Turbinaria ornata was found to be the most active. Bioassay-guided fractionation of this extract led to the isolation of a variety of different carotenoids as the active principles. The major bioactive antioxidant compound was identified as the carotenoid fucoxanthin. These results show, for the first time, that numerous Hawaiian algae exhibit significant antioxidant activity, a property that could lead to their application in one of many useful healthcare or related products as well as in chemoprevention of a variety of diseases including cancer.

Nutraceutical

Bioactive compound

Brown algae

Red algae

10.3390/md10020403

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Citations (231)

Swimming and Buoyancy in Ontogenetic Stages of the Cushion Star Pteraster tesselatus (Echinodermata: Asteroidea) and Their Implications for Distribution and Movement

Biological Bulletin (1999)

Dovi Kelman RB Emlet

The eggs of some marine fish (1) and benthic invertebrates such as many corals (2, 3) and lecithotrophic echinoderms (4, 5) are positively buoyant at time of release from the parent, and density increases later in ontogeny. How these eggs and larvae are distributed in the water column and eventually reach suitable habitat for settlement will depend, in part, on their vertical velocity and on the turbulence in the water (i.e., the eddy diffusivity). For eggs and unhatched stages, vertical velocity is passive and depends on egg or embryonic volume and density relative to the seawater (6, 7). For motile stages, vertical velocity depends on relative density, swimming ability, and behavior of the larvae (8, 9). We have measured the vertical velocity of eggs and larvae of the sea star Pteraster tesselatus Ives, which spawns floating eggs (1.1 to 1.5 mm diameter) that develop into nonfeeding larvae and spend several weeks in the plankton before settling to the benthos (10). Because of the simple shapes of eggs and larvae, we used force balance equations for drag and buoyant forces to determine the density of eggs and two larval stages. Initially the eggs were positively buoyant and floated upwards at about 1 mm/s. Even formalin-fixed eggs floated in seawater, so concentrations of light ions were not responsible for the buoyancy. The density of the larvae increased in the jrst 10 to 11 days, but it varied considerably between the three larval cohorts examined. Ten-day-old larvae that were negatively buoyant swam downward at mean speeds as high as 1.7 mm/s, while positively buoyant larvae of the same age swam upward at about 1 mm/s. These patterns of buoyancy and swimming velocity should initially facilitate dispersion and later promote settlement into subtidal habitats.

Diel vertical migration

Neutral buoyancy

Benthos

Settling

Marine larval ecology

10.2307/1542784

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Citations (14)

Correlation between leaf age, shade levels, and characteristic beneficial natural constituents of tea (Camellia sinensis) grown in Hawaii

Food Chemistry (2012)

Ran Song Dovi Kelman K.L. Johns Anthony D. Wright

Theaceae

Theanine

Black tea

10.1016/j.foodchem.2012.01.078

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Citations (101)

Comparative analysis of the antioxidant properties of Icelandic and Hawaiian lichens

Environmental Microbiology (2015)

Kehau A. Hagiwara Patrick R. Wright Nicole K. Tabandera Dovi Kelman Rolf Backofen

Summary Antioxidant activity of symbiotic organisms known as lichens is an intriguing field of research because of its strong contribution to their ability to withstand extremes of physical and biological stress (e.g. desiccation, temperature, UV radiation and microbial infection). We present a comparative study on the antioxidant activities of 76 I celandic and 41 H awaiian lichen samples assessed employing the DPPH ‐ and FRAP ‐based antioxidant assays. Utilizing this unprecedented sample size, we show that while highest individual sample activity is present in the I celandic dataset, the overall antioxidant activity is higher for lichens found in H awaii. Furthermore, we report that lichens from the genus P eltigera that have been described as strong antioxidant producers in studies on C hinese, R ussian and T urkish lichens also show high antioxidant activities in both I celandic and H awaiian lichen samples. Finally, we show that opportunistic sampling of lichens in both I celand and H awaii will yield high numbers of lichen species that exclusively include green algae as photobiont.

10.1111/1462-2920.12850

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Citations (6)

Phylogenetic diversity of bacteria associated with the mucus of Red Sea corals

FEMS Microbiology Ecology (2008)

Yael Lampert Dovi Kelman Yeshayahu Nitzan Zvy Dubinsky Adi Behar

Coral reefs are the most biodiverse and biologically productive of all marine ecosystems. Corals harbor diverse and abundant prokaryotic communities. However, little is known about the diversity of coral-associated bacterial communities. Mucus is a characteristic product of all corals, forming a coating over their polyps. The coral mucus is a rich substrate for microorganisms. Mucus was collected with a procedure using sterile cotton swabs that minimized contamination of the coral mucus by surrounding seawater. We used molecular techniques to characterize and compare the bacterial assemblages associated with the mucus of the solitary coral Fungia scutaria and the massive coral Platygyra lamellina from the Gulf of Eilat, northern Red Sea. The bacterial communities of the corals F. scutaria and P. lamellina were found to be diverse, with representatives within the Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Deltaproteobacteria and Epsilonproteobacteria, as well as the Actinobacteria, Cytophaga-Flavobacter/Flexibacter-Bacteroides group, Firmicutes, Planctomyces, and several unclassified bacteria. However, the total bacterial assemblage of these two corals was different. In contrast to the bacterial communities of corals analyzed in previous studies by culture-based and culture-independent approaches, we found that the bacterial clone libraries of the coral species included a substantial proportion of Actinobacteria. The current study further supports the finding that bacterial communities of coral mucus are diverse.

Alphaproteobacteria

Anthozoa

Cytophaga

Betaproteobacteria

10.1111/j.1574-6941.2008.00458.x

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Citations (63)

Twilight Zone Sponges from Guam Yield Theonellin Isocyanate and Psammaplysins I and J

Journal of Natural Products (2012)

Anthony D. Wright Peter J. Schupp Jan-Philipp Schrör Anna Engemann Sven Rohde

From the organic extracts of two Guam sponges, Rhaphoxya sp. and Suberea sp., determined to have cytotoxic and chemopreventive activities, three new compounds, theonellin isocyanate (1) and psammaplysins I and J (5, 6), and six previously reported compounds (2–4, 7–9) were isolated and characterized spectroscopically (1H and 13C NMR, MS, IR, UV, [α]D). The two new metabolites (5 and 6) isolated from the Suberea sp. sponge are rare examples of compounds containing a bromotyramine moiety rather than the more usual dibromo analogue. For the compounds isolated from the Rhaphoxya sp., this is the first report of the known compounds 2–4 being found in a single sponge. For previously reported compounds 2–4 complete unambiguous 1H and 13C NMR data are provided.

Isocyanate

Sponge

10.1021/np200939d

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Citations (31)

An association between a dendronotid nudibranch (Mollusca, Opisthobranchia) and a soft coral (Octocorallia, Alcyonaria) from the Red Sea

Journal of Natural History (1999)

Conxita Àvila Dovi Kelman Yoel Kashman Yehuda Benayahu

The association between a dendronotid nudibranch and the soft coral Parerythropodium fulvum fulvum (Forskål, 1775) is described from the Red Sea. The nudibranch is a new species of the genus Marioniopsis Odhner, 1934 (Nudibranchia: Dendronotacea). This species feeds on the alcyonacean octocoral P. f. fulvum, and the slugs do not take zooxanthellae from their prey. The nudibranchs are randomly distributed on the soft coral host, usually one slug per colony, and 24.5% of the soft coral colonies found are occupied by slugs. The nudibranch matches the colour of its prey and the gill clusters have a shape similar to that of the soft coral polyps, and because of these they are very cryptic on its surface. Marioniopsis fulvicola sp. n. is characterized by a thin, elongated body with a smooth dorsal surface, a narrow foot, seven to nine clusters of gills, three to four velar processes per side, 22–32 stomach hard plates, and jaws with more than 100 denticles arranged in four to five rows. The radula presents a median tricuspid tooth, a simple first lateral, and the rest of laterals hamate, without denticles. Marioniopsis fulvicola sp. n. is usually brown-yellow in colour, with brown transverse stripes forming darker patches between the gill clusters. Rhinophores and gills have a bluish coloration.

Nudibranch

Octocorallia

Opisthobranchia

Zooxanthellae

10.1080/002229399299833

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Citations (14)