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Swimming bacteria can be trapped for prolonged times at the surface of an impenetrable boundary. The subsequent surface confined motility is found to be very sensitive to the physico-chemical properties of the interfaces which determine the boundary conditions for the flow. The quantitative understanding of this complex dynamics requires detailed and systematic experimental data to validate theoretical models for both flagellar propulsion and interfacial dynamics. Using a combination of optical trapping and holographic imaging we study the 3D dynamics of wall entrapment of swimming bacteria that are sequentially released towards a surfactant-covered liquid-air interface. We find that an incompressible surfactant model for the interface quantitatively accounts for the observed normal and tangential speed of bacteria as they approach the boundary. Surprisingly we also find that, although bacteria circulate over the air phase in counterclockwise circular trajectories, typical of free-slip interfaces, the body axis is still tilted "nose down" as found for no-slip interfaces.
This article was published in the following journal.
Name: Soft matter
Methanesulfinic acid (MSIA), an organic sulfur compound, is mainly produced in the oxidation process of dimethyl sulfide in the atmosphere. The properties of MSIA at the air-water interface were studi...
First principles molecular dynamics simulations within the density functional theory framework have been used to predict the surface structure of water at various aqueous interfaces, whereas there is ...
The photocatalytic activity of TiO2 for water splitting has been known for decades, yet the adsorption structure and hydrogen bonding of water at the interface with TiO2 have remained controversial. W...
Recognition of Intrinsically Disordered Proteins (IDPs) is highly dependent on dynamics owing to the lack of structure. Here we studied the interplay between dynamics and molecular recognition in IDPs...
The gas-phase reaction of organic acids with SO3 has been recognized as essential in promoting aerosol particle formation. However, this reaction at the air-water interface is poorly understood. Herei...
Nerve entrapment as a cause of chronic abdominal pain is frequently overlooked. A series of nerves pass through the muscles of the abdomen before reaching the skin to carry sensations. The...
Aim of the study is to test the feasibility of transcutaneous oxygen pressure (TcPO2) recording in the diagnosis of popliteal entrapment syndrome (PES) in 30 patients with suspected PES an...
Background: Radical hysterectomy is an important therapy for early cervical cancer. Disfunction of urinary dynamics is the most common postoperative adverse effects, which had negative imp...
This study investigated the ability of two zinc-containing toothpaste formulations (Zinc A and Zinc B) to reduce the level of bacteria in saliva in the two-hour period after their use, com...
This study aims to investigate the correlation between pulmonary microbiota dynamics (including bacteria, fungi and viruses) and COPD exacerbation for COPD patients admitted to ICU
Reducing the SURFACE TENSION at a liquid/solid interface by the application of an electric current across the interface thereby enhancing the WETTABILITY of the surface.
A mucoprotein found in the cell wall of various types of bacteria. It has adjuvant and antitumor activities and has been used to augment the production of lymphokine-activated killer (LAK) cells.
The outermost layer of a cell in most PLANTS; BACTERIA; FUNGI; and ALGAE. The cell wall is usually a rigid structure that lies external to the CELL MEMBRANE, and provides a protective barrier against physical or chemical agents.
The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms.
A homodimerization protein interaction domain occurring at the N terminus of proteins that contain multiple copies of either CYS2-HIS2 ZINC FINGERS or KELCH REPEATS. It is characterized by a tightly intertwined dimer with an extensive hydrophobic interface. A surface-exposed groove lined with conserved amino acids is formed at the dimer interface, suggesting a peptide-binding site. Many BTB proteins are transcriptional regulators that are thought to regulate CHROMATIN structure.