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Showing 1 to 20 of 45 for “"ice nucleation"”.
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Investigating the ice nucleation activity of organic aerosol
… by altering cloud properties. Aerosol-induced ice nucleation includes several processes that impact cloud formation, lifetime, albedo, and precipitation efficiency. Ice nucleating particles (INPs) promote ice formation at warmer temperatures and lower relative humidities than required to …
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Genomic and Molecular Characterization of Microbial Ice Nucleation
… be significantly increased by particles known as ice nucleating particles (INPs). The presence of these particles in the atmosphere plays an important role in determining weather patterns and climate by helping ice crystals to form. INPs can come from different sources, but biological organisms, …
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Structure-Function Studies of a Truncated Ice-Nucleation Protein
Bacterial ice-nucleation proteins (INPs) initiate water freezing at high subzero temperatures. Despite having an opposite function to antifreeze proteins (AFPs), INPs and AFPs both have significant similarities in sequence and structure. Based on these common features, I hypothesize that INPs also …
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On the Physics of Ice Nucleation and Growth in Nanoscale
Fundamental understanding of ice formation on a surface, i.e. heterogeneous formation, is critical to suppress ice accretion on the surfaces. Ice formation on a surface includes two steps of ice nucleation and further ice growth. As water droplet is placed on a sub-zero surface, with a time delay, …
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Population Dynamics of Ice Nucleation Active Bacteria on Prunus Persica Cultivars
Populations of ice nucleation active (INA) strains of Pseudomonas fluorescens, Pseudomonas syringae, and Erwinia herbicola were assayed on four peach cultivars of known hardiness including Redhaven, Elberta, Loring, and Belle of Georgia. The addition of 0.85% NaCl to 0.1 M phosphate buffer (ph 7.0) …
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Investigation of the heterogeneous ice nucleation potential of sea spray aerosol
… role of particle chemistry on the heterogeneous ice nucleation potential of laboratory-generated sea spray aerosols. Cultures of Procholorococcus, a highly abundant marine phytoplankton species, were used as a model source of organic sea spray aerosols. Results show that smaller particles …
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Identification and characterization of ice nucleation active bacteria isolated from precipitation
… are capable of catalyzing the formation of ice at relatively warm temperatures utilizing a specific protein family which aids in the binding of water molecules. However, the overall biodiversity, concentration, and relationship of ice nucleation active (ice+) bacteria with air mass …
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Survival of ice nucleation-active and genetically engineered inactive strains of Pseudomonas syringae
The survival of ice nucleation-active (INA) and genetically engineered non-INA strains of Pseudomonas syringae was compared under starvation and freezing conditions. In starvation experiments, both strains displayed similar survival curves and recovery from starvation was nearly identical for the …
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Ultrasound-assisted Ice Nucleation, Fibroblast Migration and Oxygen Delivery in Collagen Scaffolds for Tissue Engineering
… freeze-drying. However, the stochastic nature of ice nucleation may lead to architectural variability between structures created using nominally similar preparation conditions and this can impact subsequent tissue ingrowth and function. Another common problem in tissue engineering is inadequate …
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Thermodynamics and kinetics of ice nucleation inside biological cells during freezing : as applied to mouse oocytes
Thesis (Ph. D.)--Harvard University--Massachusetts Institute of Technology Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1989.
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Investigation of supercooled cloud droplet temperatures and lifetimes in subsaturated environments with implications for ice nucleation at cloud boundaries
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Genomic, transcriptomic, and metagenomic approaches for detecting fungal plant pathogens and investigating the molecular basis of fungal ice nucleation activity
… roles in the atmosphere because of their ice nucleation activity (INA). INA is the capacity of some particles to induce ice formation above the temperature that pure water freezes (-38°C). Importantly, INPs affect the ratio of ice crystals to liquid droplets in clouds, which in turn …
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Effects of simulated acidic precipitation on the colonization and ice nucleation activity of Pseudomonas syringae pv. syringae and Erwinia herbicola
Precipitation over the eastern United States has been increasing in acidity, particularly within the last three decades. The average annual pH of rain in this area is about 4.2. The foliar surface, or phylloplane, of soybean can be damaged by rain acidified to pH 2.9. Simulated acidic precipitation …
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Water on Calcite (10.4) and K-Feldspar (001) - Adsorption Structure and Desorption Kinetics -
… weathering of rocks, and atmospheric ice nucleation by mineral dusts. These small-scale processes at mineral-water interfaces have tremendous impact on our environment. For instance, ice nucleation caused by mineral dusts changes the properties of clouds, and, thus, influences our …
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Microphysics of atmospheric aerosols : phase transitions and cloud formation mechanisms
… investigated in this study. Upper tropospheric ice clouds (cirrus) form when ice is nucleated either homogeneously or heterogeneously in aqueous aerosols. We have investigated the homogeneous and heterogeneous ice nucleation in aqueous particles. Our results for homogeneous nucleation in aqueous …
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An Investigation Of Cloud Processes Relevant To Climate Sensitivity
… three topics pursued are characterization of the ice fall speed in cirrus clouds, ice nucleation in cirrus clouds and ground-based remote sensing of cloud properties in ice clouds and mixed phase clouds.Studies have shown that the ice fall speed determines one of the most important climate …
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Getting out of the water and into the air: Understanding aerosolization of the bacterium Pseudomonas syringae from aquatic environments
… and in the atmosphere and may express an ice nucleation protein (bacteria expressing the protein are Ice+ and bacteria not expressing the protein are Ice-). Ice+ bacteria may be involved in cloud formation and precipitation processes due to their ability to freeze water at warmer …
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