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We study a swimming undulating sheet in the isotropic phase of an active nematic liquid crystal. Activity changes the effective shear viscosity, reducing it to zero at a critical value of activity. Expanding in the sheet amplitude, we find that the correction to the swimming speed due to activity is inversely proportional to the effective shear viscosity. Our perturbative calculation becomes invalid near the critical value of activity; using numerical methods to probe this regime, we find that activity enhances the swimming speed by an order of magnitude compared to the passive case.
This article was published in the following journal.
Name: Physical review letters
A series of stepped velocity tests were carried out in a Brett-type swimming respirometer and the overall range in swimming performance for twelve Schizothoracinae species was measured. The relative c...
Fluoxetine and propranolol are neuroactive human pharmaceuticals that occur frequently as pollutants in surface waters. The potential effects of these pharmaceuticals on aquatic organisms have raised ...
The investigation of mechanosensory feedback to locomotion has been hindered by the challenge of recording neurons in motion. Genetic accessibility and optical transparency of zebrafish larvae provide...
Sperm cells undergo a wide variety of swimming patterns by a beating flagellum to maintain high speed regardless of the rheological and physical properties of the background fluid. In this work, we de...
The run and tumble motions of a swimming bacterium are well characterized by two stochastic variables: the speed v(t) and the change of direction or deflection x(t) = cos φ(t), where φ(t) is the t...
This study aims to assess the influence of exposure to swimming pool environment on respiratory symptoms and diseases, and on cancer outcomes among swimmers and swimming pool attendants.
This study investigates repetitive cold-water exposure on brown fat activity assessed by infrared thermography imagine. Furthermore we will assess glucose control upon winter-swimming. Obe...
To study the effects of swimming with water walking in children aged between 6 and 12 years in terms of spirometric values.
Aging is associated with progressive decreases in arterial health and function as well as overall fitness. It is crucial to prevent or reduce the negative effects of aging on the vasculatu...
Cognitive impairment is one of the symptoms of Multiple Sclerosis (MS), and it may occur during the first years of the disease. It usually affects attention, information processing speed a...
Excavations or containment structures filled with water and used for swimming.
A moderate-growing, photochromogenic species found in aquariums, diseased fish, and swimming pools. It is the cause of cutaneous lesions and granulomas (swimming pool granuloma) in humans. (Dorland, 28th ed)
An activity in which the body is propelled through water by specific movement of the arms and/or the legs. Swimming as propulsion through water by the movement of limbs, tail, or fins of animals is often studied as a form of PHYSICAL EXERTION or endurance.
Dental methods involving the use of DENTAL HIGH-SPEED EQUIPMENT.
Enhancement of viral infectivity caused by non-neutralizing antibodies. There are at least two mechanisms known to account for this: mediation by Fc receptors (RECEPTORS, FC) or by complement receptors (RECEPTORS, COMPLEMENT). Either the virus is complexed with antiviral IMMUNOGLOBULIN G and binds to Fc receptors, or virus is coated with antiviral IMMUNOGLOBULIN M and binds to complement receptors.