Article
Geology
Thomas Mann, Andre Wizemann, Marleen Stuhr, Yannis Kappelmann, Alexander Janssen, Jamaluddin Jompa, Hildegard Westphal
Summary: Early-diagenetic cementation of tropical carbonates results from a combination of physico-chemical and biological processes. Analysis of Holocene Halimeda segments in Indonesia shows diverse cementation types and processes. This study provides new quantitative constraints on the rate of diagenetic cementation in tropical carbonate factories.
Article
Ecology
P. Buapet, S. Sinutok
Summary: This study examined the interactive effects of temperature and irradiance on photosynthesis, calcification, and oxidative stress in three common calcifying macroalgae in shallow reef flats in Thailand. The results showed that high temperature primarily induced stress responses, leading to decreased photosynthetic carbon uptake, photoinhibition, and calcification rates in all three macroalgae. The most severe effects were observed at 42 degrees Celsius, which highlighted the potential threat of temperature rise on the health of calcified macroalgae.
APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH
(2023)
Article
Ecology
P. Buapet, S. Sinutok
Summary: This study investigated the effects of temperature and irradiance on three common calcifying macroalgae in shallow reef flats in Thailand. The results showed that high temperature induced stress responses, leading to decreased photosynthetic carbon uptake and calcification rates. A temperature rise poses a potential threat to the health of calcified macroalgae.
APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH
(2023)
Article
Biochemistry & Molecular Biology
Wakako Takano, Toru Hisabori, Ken-ichi Wakabayashi
Summary: This study established a rapid method for estimating cytosolic ATP levels from ciliary beating frequency in C. reinhardtii, allowing for quick estimation of ATP concentration in live cells. The method permits quantitative and noninvasive assessment of genetic mutations or inhibitors of photosynthesis and respiration, providing a convenient tool for studying ATP production mechanisms in C. reinhardtii or other ciliated organisms.
JOURNAL OF BIOLOGICAL CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Shohei Takada, Yu-ki Tanaka, Kazuhiro Kumagai, Keita Kobayashi, Akiko Hokura, Yasumitsu Ogra
Summary: This study investigates the mechanism of tellurium (Te) nanorod formation in Chlamydomonas reinhardtii. It is found that the alga initially metabolizes tellurate to form soluble Te compounds, and excess tellurate is then transformed into low-toxicity Te nanorods.
Article
Chemistry, Multidisciplinary
Alyssa Spear, Oleksandr Orativskyi, Samantha Tran, Jon A. Zubieta, Robert P. Doyle
Summary: Peptide chemists are searching for fast and easy purification methods for producing disulphide bonds after solid-phase synthesis. The current methods are time-consuming, can lead to side-products and require challenging purification. In this study, a rapid and green oxidation method using a biocompatible corrin ring-containing compound called dicyanocobinamide is described. The method is conducted in aqueous solution, in air, and offers reaction times under 1 hour with simple one step removal of the catalyst.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Saransh W. Maurya, Hozeyfa Sagir, Mohd D. Ansari, Ibadur R. Siddiqui
Summary: In this study, highly efficient organocatalyst arginine coupled magnetic nanoparticles were synthesized to catalyze the synthesis of biodynamically significant quinolines. The catalyst exhibited compatibility with a wide range of functional groups and generated various quinoline derivatives in good to excellent yields under solvent free conditions. The reported catalyst displayed superior activity due to the synergistic effect of factors such as the use of iron oxide nanoparticles as supports, encapsulation of MNPs with L-arginine, environmentally friendly coating agent, and potential recovery by an external magnet.
Review
Cell Biology
Kshitij Tandon, Marisa M. Pasella, Cintia Iha, Francesco Ricci, Juntong Hu, Charles J. O'Kelly, Monica Medina, Michael Kuhl, Heroen Verbruggen
Summary: Ostreobium is a siphonous green alga that burrows into calcium carbonate substrates and forms green bands on coral skeletons. It plays a major role in carbonate reef bioerosion and contributes to the coral's nutritional needs. This review summarizes knowledge on Ostreobium's biology, including its morphology, biodiversity, photosynthesis, bioerosion mechanisms, and its role in the coral holobiont.
SEMINARS IN CELL & DEVELOPMENTAL BIOLOGY
(2023)
Article
Environmental Sciences
Aske Bang Hansen, Anne Sofie Pedersen, Michael Kuhl, Kasper Elgetti Brodersen
Summary: Ocean warming may affect the epiphytes of seagrass, leading to a decrease in photosynthetic efficiency, especially at high temperatures. Epiphytes have a competitive advantage in cold CO2-rich environments, while seagrass with bare leaves may not be affected by elevated seawater temperatures.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Rachel Alderdice, Benjamin C. C. Hume, Michael Kuhl, Mathieu Pernice, David J. Suggett, Christian R. Voolstra
Summary: This study investigates the differences in hypoxia gene inventories among coral species and finds that these differences are species-specific rather than related to different coral clades. Porites lutea exhibits the highest gene expansion, which is associated with its greater stress tolerance. The study provides important genes of interest for understanding and diagnosing coral stress responses.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biology
Kshitij Tandon, Francesco Ricci, Joana Costa, Monica Medina, Michael Kuhl, Linda L. Blackall, Heroen Verbruggen
Summary: Currently, our understanding of the coral holobiont microbiomes is biased towards the coral tissue, neglecting the diversity of the coral skeleton microbiome. Through genomic analysis of the coral skeletons of Porites lutea and Isopora palifera, we found a wide range of stress response genes and genes involved in maintaining host association in the skeleton microbiomes. The skeletal microbiome also plays important roles in metabolic processes such as nitrogen fixation and nitrate reduction.
Article
Microbiology
Francesco Ricci, Kshitij Tandon, Maria Mosshammer, Ellie H. -J. Cho, Linda L. Blackall, Michael Kuhl, Heroen Verbruggen
Summary: In this study, the researchers used chemical imaging and microbiome characterization to investigate the impact of physicochemical gradients on the coral skeleton microbiome. They found that the microbial community in the coral skeleton was influenced by the physicochemical environment, and the microbiome composition was linked to the abiotic conditions.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Plant Sciences
Kasper Elgetti Brodersen, Michael Kuhl
Summary: In many terrestrial seeds, photosynthetic activity provides oxygen to the developing plant embryo. However, it is unclear whether seagrass seeds have similar photosynthetic capacity to alleviate intra-seed hypoxic stress. This study used various techniques to determine the oxygen microenvironment and photosynthetic activity in developing seeds and seedlings of seagrass. The findings showed that sheath-covered seeds had high oxygen concentrations in the photosynthetic active seed sheath and low oxygen concentrations at the position of the embryo. Photosynthesis in the seed sheath increased oxygen availability in central parts of the seed, enabling enhanced respiratory energy generation for biosynthetic activity.
Article
Environmental Sciences
Swathi Murthy, Cristian Picioreanu, Michael Kuehl
Summary: Reef building corals have complex structures to maximize photosynthesis while minimizing damage and stress. A multiphysics modeling approach was used to simulate the internal environment of corals, including light, temperature, and oxygen distribution. The model results were consistent with spatial measurements, providing insights into the effect of coral morphology and light scattering on the coral's internal environment.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Ecology
Niclas Heidelberg Lyndby, Margaret Caitlyn Murray, Erik Trampe, Anders Meibom, Michael Kuhl
Summary: This study investigated the internal physico-chemical microenvironment of the jellyfish Cassiopea during light-dark periods using fiber-optic sensors and microsensors. The results showed that different anatomical structures of Cassiopea have different light availability, and white pigmented tissue has higher light availability than non-pigmented tissue. Large Cassiopea can maintain higher O-2 concentration during darkness, while small Cassiopea exhibit rapid changes. These findings improve our understanding of the relationship between jellyfish and their photosynthetic endosymbionts.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Biotechnology & Applied Microbiology
Victor Fernandez-Juarez, Soren Hallstrom, Cesar O. Pacherres, Jiaqi Wang, Guillem Coll-Garcia, Michael Kuhl, Lasse Riemann
Summary: This study examined the factors that regulate nitrogen fixation in an anoxygenic phototrophic bacterium and found that light and anoxia stimulated nitrogen fixation. The study also revealed the importance of biofilm formation for nitrogen fixation under oxic conditions. These findings highlight the physiological adaptations and the role of light in marine non-cyanobacterial diazotrophs.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Microbiology
Bruno Jesus, Thierry Jauffrais, Erik Trampe, Vona Meleder, Lourenco Ribeiro, Joan M. Bernhard, Emmanuelle Geslin, Michael Kuhl
Summary: Intertidal microphytobenthic (MPB) biofilms play a key role in coastal primary production through the movement and vertical migration of diatoms exhibiting photo-regulation. This study compared the photo-regulation features and non-photochemical quenching (NPQ) responses of four epipelic diatom species from a natural MPB biofilm. The results showed species-specific photo-regulation and a wide range of NPQ, suggesting the coexistence of epipelic species in compacted light niches. Additionally, the study revealed that diatom cell orientation within MPB can be modulated by light, highlighting the importance of considering species-specific responses and understanding cell orientation and photo-behaviour in MPB research.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Biology
Niclas Heidelberg Lyndby, Swathi Murthy, Sandrine Bessette, Sofie Lindegaard Jakobsen, Anders Meibom, Michael Kuhl
Summary: The study used optical coherence tomography (OCT) to investigate the morphology and tissue optical properties of Cassiopea jellyfish. The results showed that white granules in Cassiopea enhanced the local light-availability for symbionts, leading to higher carbon fixation compared to tissue without these granules.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Correction
Multidisciplinary Sciences
Rachel Alderdice, Gabriela Perna, Anny Cardenas, Benjamin C. C. Hume, Martin Wolf, Michael Kuhl, Mathieu Pernice, David J. Suggett, Christian R. Voolstra
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Jacob Malte Molin, William Emil Groth-Andersen, Per Juel Hansen, Michael Kuhl, Kasper Elgetti Brodersen
Summary: Seagrasses provide crucial ecosystem services, but anthropogenic activities are causing global seagrass decline. This study investigates the effects of microplastic exposure on the photosynthesis and respiration of the seagrass Zostera marina and its associated epiphytes. The results show limited effects of short-term microplastic exposure on seagrass leaves and their epiphytes.
FRONTIERS IN MARINE SCIENCE
(2023)
Review
Environmental Sciences
Gabriel Ferreira, Elena Bollati, Michael Kuhl
Summary: Corals are capable of synthesizing various pigments that give them their characteristic colors. These pigments, mostly green fluorescent protein-like pigments, cover almost the entire visible spectrum and can fluoresce from cyan to red. The role of these host pigments in coral biology is not fully understood, but they have the ability to modify the light exposure of photosymbionts, potentially helping the holobiont adapt to different environmental conditions. Mechanisms such as energy transfer between pigments and tissue plasticity may play a role in photoprotection or photoenhancement. This review discusses the current knowledge and challenges in investigating the link between host pigments and symbiont photosynthesis in reef-building corals.
FRONTIERS IN MARINE SCIENCE
(2023)
Review
Cell Biology
Kshitij Tandon, Marisa M. Pasella, Cintia Iha, Francesco Ricci, Juntong Hu, Charles J. O'Kelly, Monica Medina, Michael Kuehl, Heroen Verbruggen
Summary: Ostreobium is a green alga that lives in calcium carbonate substrates and can survive in low light and low oxygen conditions. It is a major contributor to the erosion of coral reefs and plays a role in the nutrition of corals. Understanding the biology of Ostreobium and its role in coral reefs is important for the study and conservation of these ecosystems.
SEMINARS IN CELL & DEVELOPMENTAL BIOLOGY
(2023)
