Article
Multidisciplinary Sciences
Jiahao Gong, Vaseem A. Shaik, Gwynn J. Elfring
Summary: Active particles, both living and synthetic, often move through environments with gradients in properties like light, heat, or nutrient concentration. Recent research has examined the role of viscosity gradients in the suspending fluid as a mechanical mechanism for directed motion. The theoretical model developed in this study explains experimental observations of reorientation in microorganisms due to sharp viscosity changes.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Andriy Gusak, Anastasiia Titova
Summary: The initial stages of contact melting and eutectic crystallization in sharp concentration gradients between two crystalline components were analyzed and simulated. It was found that contact melting became possible only after the formation of a critical width of solid solutions. Crystallization in the sharp concentration gradient could lead to the formation of periodic structures in the interface vicinity. In addition, the threshold temperature existed for eutectic systems of Ag-Cu type, where the crystallization mechanism could change from precipitation + growth to polymorphic crystallization with eutectic composition + subsequent spinodal decomposition.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
Justin C. Feng, Shinji Mukohyama, Sante Carloni
Summary: In this article, we develop the formalism for singular hypersurfaces and junction conditions in generalized coupling theories using a variational approach. We then examine the behavior of sharp matter density gradients in generalized coupling theories. Through a detailed example, we find that sharp boundaries do not generate singularities in the dynamical frame despite the presence of an auxiliary field.
Article
Chemistry, Applied
Linqiang Niu, Tian Zhang, Haoran Zhao, Haiyang Dong, Yahong Zhang, Tingting Liang, Jianhong Wang
Summary: A smart dual-responsive fluorescence probe was developed for simultaneous sensing of Cys and viscosity in cells. The probe exhibited high selectivity and sensitivity, and showed sharp contrast fluorescence between red and green. It was successfully used to monitor the fluctuations of intracellular Cys and cytoplasmic viscosity induced by monensin and LPS.
Article
Environmental Sciences
Gabriela Calegario, Lucas Freitas, Luciana Reis Appolinario, Taina Venas, Tatiane Arruda, Koko Otsuki, Bruno Masi, Claudia Omachi, Ana Paula Moreira, Ana Carolina Soares, Carlos E. Rezende, Gizele Garcia, Diogo Tschoeke, Cristiane Thompson, Fabiano L. Thompson
Summary: The study found that rhodolith microbiomes in the Great Amazon Reef System are very consistent across different regions, but there are subtle differences between the microbiomes from southern sites with enhanced functional and taxonomic characteristics. This may be linked to higher light availability and nutrient loads in the southern sector.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Mathematics, Applied
Mario De Florio, Enrico Schiassi, Francesco Calabro, Roberto Furfaro
Summary: This work compares four different methods based on Physics-Informed Neural Networks (PINNs) for solving Differential Equations (DE): Classic-PINN, Deep-TFC, PIELM, and X-TFC. They are compared by solving the boundary value problem arising from the 1D Steady-State Advection-Diffusion Equation for different diffusion coefficient values. X-TFC outperforms the other three methods in solving challenging problems affected by discontinuity.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2024)
Article
Multidisciplinary Sciences
Oscar Guadayol, Tania Mendonca, Mariona Segura-Noguera, Amanda J. Wright, Manlio Tassieri, Stuart Humphries
Summary: Microbial activity in planktonic systems alters the viscosity of the surrounding environment, creating gradients that impact the distribution of microorganisms and their ecological interactions. Understanding the role of viscosity in planktonic ecosystems is crucial for predicting nutrient cycles and global carbon dynamics.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Biotechnology & Applied Microbiology
Obie Farobie, Novi Syaftika, Imron Masfuri, Tyas Puspita Rini, Dovan P. A. Lanank Es, Asep Bayu, Apip Amrullah, Edy Hartulistiyoso, Navid R. Moheimani, Surachai Karnjanakom, Yukihiko Matsumura
Summary: This study investigates the potential of producing green fuel from green algae Ulva lactuca via sub-critical water gasification. The process results in an increase in energy content of the fuel, with hydrochar obtained exhibiting higher heating values than typical low-ranked coals, indicating its potential as a solid fuel source.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Engineering, Multidisciplinary
Francesco Calabro, Gianluca Fabiani, Constantinos Siettos
Summary: This study introduces a numerical method based on machine learning, using Extreme Learning Machines to approximate solutions to linear elliptic partial differential equations. By utilizing a feedforward neural network to compute matched solutions, the method avoids the cumbersome training phase of other machine learning approaches. Numerical results demonstrate high accuracy, outperforming traditional central Finite Differences methods.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Chemistry, Physical
Elham Emami, Mohammad H. Mousazadeh
Summary: In this study, spirulina algae were utilized for synthesizing green fluorescent-carbon dots (G-CDs) and a fluorescent probe based on G-CDs was successfully designed for detection of Cu2+ and C2O42-, showing potential applications in tap water, mineral water, and living cells.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Mechanics
I. Shukla, F. Wang, S. Mowlavi, A. Guyomard, X. Liang, S. G. Johnson, J. -c. Nave
Summary: Recent research has shown that feeding a silicon-in-silica coaxial fiber into a flame can result in the formation of silicon spheres with size controlled by feed speed. A reduced model to predict droplet size from feed speed has been derived, but quantitative validation has been challenging due to experimental uncertainties in parameter values and temperature profile. In this study, the reduced model was validated through three-dimensional simulations, showing excellent agreement across a range of feed speeds and constant capillary numbers at breakup location. This low-cost model is a useful tool for designing future experiments.
Article
Biology
Thomas H. P. Harvey
Summary: Research has revealed the presence of acritarch fossils from the early Cambrian with determinate colonial organization, indicating an early development of green algal phytoplankton in marine settings and potential adaptations to Cambrian metazoan invasion.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Article
Biotechnology & Applied Microbiology
Zahra Karimi, David M. Blersch, Virginia A. Davis
Summary: Attached algal cultivation systems have the potential to improve productivity and efficiency, but there is a lack of understanding of algae-substrate interactions. This study presents a design for an indoor flow way photobioreactor and assesses the effects of key parameters on the attached cultivation of filamentous green algae. The results demonstrate that carefully designed indoor reactors offer advantages for studying algae-substrate interactions in terms of repeatability, flow uniformity, and cost-effectiveness.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Engineering, Environmental
Y. L. Cheryl-Low, Pei San Kong, Hwei Voon Lee
Summary: This study successfully produced bio-oil based polyolesters using alginate acid catalyst, achieving excellent ester purity and diester selectivity, with potential lubricating properties.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Biodiversity Conservation
Fei Yu, Jiaxin Li, Linjun Zhang, Ganggang Zhang, Yueqin Yang, Yang Wang, Xianfeng Yi
Summary: The Grain-for-Green Program in China is effective for protecting the ecological environment and mitigating disasters. This study compared the effects of different types of vegetation restoration on the rodent abundance, seed dispersal, and seedling recruitment in a forest in the Taihang Mountains. The results showed that the Grain-for-Green forest had similar effects to the natural forest in terms of rodent composition and abundance, but had higher seed removal rate and dispersal distance compared to abandoned cropland, indicating its potential for providing seed dispersal service and contributing to vegetation restoration and biodiversity conservation.
ECOLOGICAL INDICATORS
(2023)
Article
Physics, Fluids & Plasmas
Simone Coppola, Vasily Kantsler
Summary: Experiments on eight different ratchets of various shapes and sizes revealed that curved ratchets tend to perform the best in optimizing bacteria rectification in microfluidic devices. The radius of curvature of the ratchets influences the time bacteria spend on the ratchet surface, with a 60 μm radius semicircle with 15 μm concavities identified as the optimal bacterial ratchet. Additionally, the angle at which bacteria leave the ratchets was found to play a significant role in their efficiency, a finding confirmed through numerical simulations of experimental conditions.