Results 101 to 110 of about 537,960 (204)

A distinct gene expression mechanism for d‐amino acid utilization in hyperthermophilic archaeon Pyrococcus horikoshii

The FEBS Journal, EarlyView.
The genes PH0137, PH0138, and PH0140 form a cluster in the genome of Pyrococcus horikoshii. The PH0140 gene encodes a transcription factor identified as a d‐amino acid‐responsive regulatory protein (DARP). In feast mode, l‐Ile‐bound DARP binds to the promoter and represses transcription of PH0137 and PH0138. In famine mode, DARP binds to d‐allo‐Ile and
Ryushi Kawakami, Tomoki Kawase, Taira Uehara, Haruhiko Sakuraba, Tomohiko Matsuzawa, Junji Hayashi, Toshihisa Ohshima   +6 more
wiley   +1 more source

The Production of Methane, Hydrogen, and Organic Compounds in Ultramafic-Hosted Hydrothermal Vents of the Mid-Atlantic Ridge

Astrobiology, 2015
Both hydrogen and methane are consistently discharged in large quantities in hydrothermal fluids issued from ultramafic-hosted hydrothermal fields discovered along the Mid-Atlantic Ridge. Considering the vast number of these fields discovered or inferred,
C. Konn, J. Charlou, Nils G. Holm, O. Mousis   +3 more
semanticscholar   +1 more source

Prebiotic aqueous reactions catalyzed by native nickel without hydrogen

The FEBS Journal, EarlyView.
Serpentinizing (H2‐producing) hydrothermal vents are candidate environments for metabolic origin. They generate highly reducing conditions that convert CO2 to formate and methane in abiotic reactions resembling reactions of the acetyl‐CoA pathway of CO2 fixation. They also contain natural catalysts. Native nickel (Ni0), like Fe0, Co0, and their alloys,
Carolina Garcia Garcia, Max Brabender, William F. Martin   +2 more
wiley   +1 more source

The deep sea energy park: harvesting hydrothermal energy for seabed exploration

, 2012
Modern society is in growing need of natural resources. Energy security remains one of the greatest challenges that we face. We need increasing amounts of energy, but it is no longer acceptable to supply it at the expense of the environment.
Abubakar, Usman, Hauerhof, Elena, Parada, Jorge, Feng, Xiangbo, Parada Puig, J.E., Suzuki, Ryosuke, Suzuki, R., Hauerhof, E., Bennett, S.S. Shenoi, R.A., Wilson, P.A., Feng, X., Abubakar, U.   +10 more
core   +1 more source

Fluid ingress and surface wettability of 3D‐printed closed‐hollow obturator specimens across material types and printing orientations

Journal of Prosthodontics, EarlyView.
Abstract Purpose To evaluate the effects of material type, printing orientation, and thermocycling on cumulative fluid ingress in three‐dimensional (3D)‐printed closed‐hollow obturator specimens and to compare water contact angle among material–printing orientation groups.
Wisarut Prawatvatchara, Soranun Chantarangsu, Somphote Angkanawiriyarak, Raiwint Khunwisetkul, Kwanwong Boonpitak, Visaluk Punyawattananon, Cheewin Towithelertkul   +6 more
wiley   +1 more source

Perturbations in Microbial Communities at Hydrothermal Vents of Panarea Island (Aeolian Islands, Italy)

Biology
Marine hydrothermal ecosystems represent extreme environments connected to submarine volcanic areas characterized by vents, having high temperatures and particular chemical compositions.
Annamaria Gallo, Fabio Sposito, Manfredi Longo, Gianluca Lazzaro, Cinzia Giuseppina Caruso, Sabina Morici, Sergio Scirè Scappuzzo, Slobodanka Radovic, Valeria Villanova, Luca Vecchioni, Marco Arculeo, Rosa Alduina   +11 more
doaj   +1 more source

Evolutionary and biogeographical patterns of barnacles from deep‐sea hydrothermal vents

Molecular Ecology, 2015
The characterization of evolutionary and biogeographical patterns is of fundamental importance to identify factors driving biodiversity. Due to their widespread but discontinuous distribution, deep‐sea hydrothermal vent barnacles represent an excellent ...
Santiago Herrera, H. Watanabe, T. Shank
semanticscholar   +1 more source

Effect of access‐opening closure materials on fluid‐related mass gain and volumetric change in three‐dimensionally printed closed‐hollow obturator specimens

Journal of Prosthodontics, EarlyView.
Abstract Purpose To investigate how denture base resin and access‐opening closure material affect fluid‐related mass gain and micro‐computed tomography‐derived volumetric changes in three‐dimensionally printed closed‐hollow obturator specimens. Materials and Methods Specimens were printed from NextDent Denture 3D+ or Apex Base resin.
Wisarut Prawatvatchara, Soranun Chantarangsu, Raiwint Khunwisetkul, Visaluk Punyawattananon, Cheewin Towithelertkul, Murali Srinivasan, Dusit Nantanapiboon   +6 more
wiley   +1 more source

The geochemistry and geomicrobiology of relict hydrothermal sulphide deposits

, 2000
The diagenetic re-mineralisation of seafloor-sulphide deposits and the role of microbes in the metal-exchange processes were investigated in metalliferous sediments from the Alvin relict hydrothermal zone in the TAG area at 26º8'N (Mid-Atlantic Ridge ...
Severmann, S.
core   +1 more source

Biogeochemical Processes at Hydrothermal Vents: Microbes and Minerals, Bioenergetics, and Carbon Fluxes [PDF]

Oceanography, 2012
Hydrothermal vents are among the most biologically active regions of the deep ocean. However, our understanding of the limits of life in this extreme environment, the extent of biogeochemical transformation that occurs in the crust and overlying ocean ...
James F. Holden, John A. Breier, Karyn L. Rogers, Mitchell D. Schulte, Brandy M. Toner   +4 more
doaj