A5077620058- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Protist diversity and phylogeny
- Biocrusts and Microbial Ecology
- Marine Biology and Ecology Research
- Algal biology and biofuel production
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Photosynthetic Processes and Mechanisms
- Microbial Metabolic Engineering and Bioproduction
- Wastewater Treatment and Nitrogen Removal
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- Biofuel production and bioconversion
- Enzyme Production and Characterization
- Species Distribution and Climate Change
- Lichen and fungal ecology
- Genomics and Phylogenetic Studies
- Plant and animal studies
- Fluoride Effects and Removal
- Mitochondrial Function and Pathology
- Bacterial Genetics and Biotechnology
- Microbial Fuel Cells and Bioremediation
- Seaweed-derived Bioactive Compounds
- Geology and Paleoclimatology Research
Ben-Gurion University of the Negev
2022-2024
National Oceanography Centre
2018-2020
Lawrence Berkeley National Laboratory
2012-2020
Tel Aviv University
2019
Hebrew University of Jerusalem
2008-2013
Microbial carbonate mineralization is widespread in nature and among microorganisms, of vast ecological geological importance. However, our understanding the mechanisms that trigger control processes such as calcification, i.e., CO2 to calcium (CaCO3), limited literature on cyanobacterial calcification oftentimes bewildering occasionally controversial. In cyanobacteria, may be intimately associated with carbon dioxide-(CO2) concentrating mechanism (CCM), a biochemical system allows cells...
ABSTRACT Bacteria acquire phosphate (P i ) by maintaining a periplasmic concentration below environmental levels. We recently described an extracellular P buffer which appears to counteract the gradient required for diffusion. Here, we demonstrate that various treatments outer membrane (OM) constituents do not affect buffered because bacteria accumulate in periplasm, from it can be removed hypo-osmotically. The gradually imported into cytoplasm ATP-powered transport, however, proton motive...
 Fairy circles are exceedingly regularly spaced barren circular patches in arid landscapes, typically encircled by a ring of taller grasses. These vegetation patterns occur Southwestern Africa and Australia have also been suggested to North Africa, Middle East Madagascar. The enigmatic origins fairy landscape shave intrigued ecologists sparked heated debate about the two main competing hypotheses: termite origin self-organization hypotheses.In southern part Giribes Plains, Kunene...
ABSTRACT Cyanobacteria of the genera Synechococcus and Prochlorococcus are most abundant photosynthetic organisms on earth, occupying a key position at base marine food webs. The cynS gene that encodes cyanase was identified among bacterial, fungal, plant sequences in public databases, particularly prevalent cyanobacteria, including numerous strains. Phylogenetic analysis retrieved from Global Ocean Survey database >60% as belonging to unicellular suggesting an important role for their...
Cyanate, a by‐product of urea decomposition, is potential nitrogen (N) source in marine environments, but to date it has received scant attention. Cyanobacteria presumably acquire this compound via substrate‐specific ABC‐type transporter ( cynABD ), and they convert ammonium carbon dioxide by cyanase cynS ) activity. Participation cyanate utilization genes N‐stress responses cyanobacteria been implied previously, its ecological context not studied. We employed polymerase chain reaction...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 62:215-230 (2011) - DOI: https://doi.org/10.3354/ame01468 Ciliate distributions and forcing factors in Amundsen Bellingshausen Seas (Antarctic) Stephen A. Wickham1,*, Ulrike Steinmair1, Nina Kamennaya2 1Department of Organismal Biology, University Salzburg, Hellbrunnerstr. 34, 5020 Austria 2Department Plant Environmental...
The smallest algae, less than 3 μm in diameter, are the most abundant eukaryotes of World Ocean. Their feeding on planktonic bacteria similar size is globally important but physically enigmatic. Tiny algal cells tightly packed with voluminous chloroplasts, nucleus, and mitochondria appear to have insufficient organelle-free space for prey internalization. Here, we present first direct observations how 1.3-μm which only 1.6 times bigger diameter their prey, hold individual Prochlorococcus...
We assessed the significance of cyanate utilization in marine primary productivity from distribution a dedicated transporter (encoded by cynABD ) different ocean environments. Several lines evidence indicate that potential is associated mainly with surface populations Prochlorococcus . Spatial and temporal dimensions cynA , cynS ntcA expression picocyanobacteria northern Red Sea supported our previous finding transcripts accumulate under more stringent N‐limiting conditions. At same time,...
The contribution of planktonic cyanobacteria to burial organic carbon in deep-sea sediments before the emergence eukaryotic predators ~1.5 Ga has been considered negligible owing slow sinking speed their small cells. However, global, highly positive excursion isotope values inorganic carbonates ~2.22-2.06 implies massive matter that had be linked oceanic cyanobacteria. Here elucidate link, we experiment with unicellular acclimated high partial CO
Cellular respiration involves complex organellar metabolic activities that are pivotal for plant growth and development. Mitochondria contain their own genetic system (mitogenome, mtDNA), which encodes key elements of the respiratory machinery. Plant mtDNAs notably larger than counterparts in Animalia, with genome organization gene expression characteristics. The maturation mitochondrial transcripts extensive RNA editing, trimming splicing events. These essential processing steps rely on...
Seamounts, often rising hundreds of metres above surrounding seafloor, obstruct the flow deep-ocean water. While retention deep-water by seamounts is predicted from ocean circulation models, its empirical validation has been hampered large scale and slow rate interaction. To overcome these limitations we use growth planktonic bacteria to assess time water a seamount. The selected Tropic Seamount in North-Eastern Atlantic representative for majority isolated seamounts, which do not affect...
Fairy Circles (FCs) are roughly circular, spatially periodic barren patches occurring both along the southwestern African coast, spanning Namib Desert (NFCs), and in Pilbara region of Western Australia (AFCs). The origin NFC AFC patterns is still debatable a subject ongoing research. Recently, it was argued that pathogenic soil microbes may contribute to ring formation Triodia basedowii grass which same species forms AFCs. We have analyzed, under controlled laboratory conditions, samples...
Abstract Fayetteville Green Lake (FGL) is a recognized, extensively studied present‐day model of the stratified Proterozoic ocean. Nonetheless, biomass sedimentation in FGL remains hard to explain: while virtually all sediment pigments belong photosynthetic sulfur bacteria from chemocline, isotopic carbon signature bulk organic matter suggests its epilimnetic phytoplankton origin. To explain origin sedimented carbon, we dominant Synechococci , isolated FGL. Here, present experimental...
ABSTRACT We present the genome of cellulose-degrading Cellulomonas sp. strain FA1 isolated from an actively serpentinizing highly alkaline spring. Knowledge this will enable studies into molecular basis plant material degradation in environments and inform development lignocellulose bioprocessing procedures for biofuel production.
In the microbe-driven ecosystems of open ocean, small heterotrophic flagellates (sHF) are chief microbial predators and recyclers essential nutrients to phototrophic microbes. Even with intensive molecular phylogenetic studies sHF, origins their feeding success remain obscure because limited understanding morphological adaptations feeding. Here, we examined sHF morphologies in largest, most oligotrophic South Pacific Atlantic (sub)tropical gyres adjacent mesotrophic waters. On four research...
Abstract Monitoring CO 2 or O concentrations within a closed, volume‐defined chamber is widely used to quantify soil respiration during laboratory incubation experiments. The standard method of using periodic manual gas sampling costly, labor‐intensive, and frequently fails capture the aerobic process. Thus, tools that allow continuous, real‐time tracking concentration changes are needed for research. This study presents new, portable, low‐cost (∼$700), open‐source sensor system measure in...