A5061420521- Marine Sponges and Natural Products
- Marine Biology and Environmental Chemistry
- Aquaculture disease management and microbiota
- Paleontology and Stratigraphy of Fossils
- Calcium Carbonate Crystallization and Inhibition
- Environmental Toxicology and Ecotoxicology
- Microbial Natural Products and Biosynthesis
- Diatoms and Algae Research
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Seismic Waves and Analysis
- Marine Ecology and Invasive Species
- Geomagnetism and Paleomagnetism Studies
- Electron and X-Ray Spectroscopy Techniques
- Microplastics and Plastic Pollution
- Recycling and Waste Management Techniques
- Seismic Imaging and Inversion Techniques
- Oceanographic and Atmospheric Processes
- Coral and Marine Ecosystems Studies
- Advanced X-ray and CT Imaging
- Cephalopods and Marine Biology
- Medical Imaging Techniques and Applications
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
Tel Aviv University
2008-2023
Weizmann Institute of Science
2021
Wingate Institute
2019
Calcite, aragonite, and vaterite are the three anhydrous polymorphs of calcium carbonate, in order decreasing thermodynamic stability. Although is not commonly found geological settings, it an important precursor several carbonate-forming systems can be biological settings. Because difficulties obtaining large, pure, single crystals, crystal structure has been elusive for almost a century. Using aberration-corrected high-resolution transmission electron microscopy, we that actually composed...
Abstract The silica cell wall of diatoms, a widespread group unicellular microalgae, is an exquisite example for the ability organisms to finely sculpt minerals under strict biological control. prevailing paradigm diatom silicification that this invariably intracellular process, occurring inside specialized deposition vesicles are responsible precipitation and morphogenesis. Here, we study formation long silicified extensions characterize many species. We use cryo-electron tomography image...
Abstract Arsenic and barium are ubiquitous environmental toxins that accumulate in higher trophic-level organisms. Whereas metazoans have detoxifying organs to cope with toxic metals, sponges lack but harbour a symbiotic microbiome performing various functions. Here we examine the potential roles of microorganisms arsenic cycles sponge Theonella swinhoei , known high levels these metals. We show single bacterium, Entotheonella sp., constitutes arsenic- barium-accumulating entity within host....
Abstract Biological systems are well known for their ability to construct remarkably complex and mechanically robust skeletal structures from a great diversity of minerals. One such example, silica, is widely used in the synthesis elements (spicules) within phylum Porifera (the sponges). As result, members this diverse group have served as useful model analysis dynamic processes biosilicification investigating structure function relationships often hierarchically ordered systems. This...
Trace elements are vital for the growth and development of all organisms. Little is known about elemental content trace metal biology Red Sea demosponges. This study establishes an initial database sponge content. It provides necessary foundation further research mechanisms used by sponges to regulate uptake, accumulation, storage metals. The 16 common species was determined using ICP measurements. A combination statistical methods determine correlations between metals detect with...
Sponges are potent filter feeders and as such exposed to high fluxes of toxic trace elements, which can accumulate in their body over time. Such is the case Red Sea sponge Theonella swinhoei, has been shown up 8500 mg/Kg highly element arsenic. T. swinhoei known harbor a multitude sponge-associated bacteria, so it hypothesized that associated-bacteria will be tolerant arsenic concentration. This study also investigates fate accumulated test if have an important role accumulation process...
Marine sponges are an extremely rich and important source of natural products. Mariculture is one solution to the so-called “supply problem” that often hampers further studies development novel compounds from sponges. We report extended culture (767 days) at sea in depths 10 20 m three sponge species: Negombata magnifica, Amphimedon chloros Theonella swinhoei produce latrunculin-B, halitoxin swinholide-A, respectively. Since sponge-associated microorganisms may be true producers many...
The solitary ascidian Phallusia nigra is rarely fouled by epibionts. Here, we tested the antifouling activity of its crude extracts in laboratory and field assays. P. inhibited growth all eight environmental bacteria two four bacteria. Extracts sympatric, but Herdmania momus only one test bacterium. Scanning electron microscopy confirmed that tunic surface largely bacteria-free. Both significantly larval metamorphosis bryozoan Bugula neritina at concentration range 0.05-2 mg ml(-1). were...
The BAM<i>line</i> at the BESSY light source in Berlin and TopoTomo beamline ANKA synchrotron facility Karlsruhe (both Germany) operate hard X-ray regime (above 6 keV) with similiar photon flux density. For typical imaging applications, a double multilayer monochromator or filtered white beam is used. In order to optimise field of view resolution available indirect pixel detectors, different optical systems have been installed, adapted, respectively, large (macroscope) high spatial...
Abstract. Processed and analyzed sea surface wave characteristics derived from an up-looking Acoustic Doppler Current Profiler (ADCP) for the period 2016–2022 are presented as a data set . The collected include full two-dimensional fields along with computed bulk parameters, such heights, periods, directions of propagation. ADCP was mounted on submerged Deep Levantine mooring station located 50 km off Israeli coast to west Haifa (bottom depth ~1470 m). It meets need accurate reliable in situ...
Abstract. Processed and analyzed sea surface wave characteristics derived from an up-looking acoustic Doppler current profiler (ADCP) for the period 2016–2022 are presented as a dataset available public open-access repository of SEA scieNtific Open data Edition (SEANOE) at https://doi.org/10.17882/96904 (Haim et al., 2022). The collected include full two-dimensional fields, along with computed bulk parameters, such heights, periods, directions propagation. ADCP was mounted on submerged Deep...
Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – 8, 2013.