...Amandine Lechantre; Baptiste Martinet; Véronique Thévenet; Oune-Saysavanh Souramasing; José Bico; Bérengère Abou ABSTRACT Viscosity, which impacts the rate of haemolymph circulation and heat transfer, is one of the transport properties that affects the performance of an insect. Measuring...

... of lamprey swimming has shown that, in the absence of sensory feedback, increasing fluid viscosity constrains swimming kinematics, limiting tail amplitude and body wavelength, resulting in decreased swimming speed. In contrast, previous experiments with Polypterus senegalus reported increased magnitude...

... species with different CHC profiles and observed a differential migration of CHCs into the thread. The migration depends on the molecular structure of the hydrocarbon types as well as their viscosity, influenced by the ambient temperature during the interaction. As a consequence, adhesion forces to CHC...

... remains largely unstudied. We hereby provide the first comparative study of the physical properties of venom in spitting and non-spitting cobras. We measured the viscosity, protein concentration and pH of the venom of 13 cobra species of the genus Naja from Africa and Asia, alongside the spitting elapid...

...Lianhui Shi; Susan W. Nicolson; Yunqiang Yang; Jianing Wu; Shaoze Yan; Zhigang Wu ABSTRACT Optimal concentrations for nectar drinking are limited by the steep increase in the viscosity of sugar solutions with concentration. However, nectar viscosity is inversely related to temperature, which...

... attention, but their physical properties were little studied. We argue that these properties determine their biological functionality, and are vital to understanding how CHC composition affects their adaptive value. We investigated melting behaviour and viscosity of CHCs from 11 ant species using...

... CHC profiles, Myrmica rubra and Myrmica ruginodis , in response to constant or fluctuating temperature and humidity regimes. We measured how acclimation affected CHC composition and viscosity, and the ants' drought survival. In both species, CHC composition showed strong, predictable responses...

.... Published by The Company of Biologists Ltd 2018 Summary: Tropical arboreal ants routinely adhere to superheated tree branches. Adhesive performance varies interspecifically, but in many cases corresponds to the average daily surface temperature of canopy branches. Viscosity Panama Canopy...

... zebrafish ( Danio rerio ) to perform escape responses in water of altered viscosity, to better understand the effects that the fluid mechanical environment exerts on kinematics. We quantified escape kinematics using 1000 frames s –1 high-speed video, and compared escape response kinematics of fish in three...

... (e.g. viscosity) in determining swimming speed is poorly understood. Here we propose a semi-mechanistic model to describe how biological rates, size and the physics of the environment contribute to the temperature dependency of microbial swimming speed. Data on the swimming speed and size...

...William G. Ryerson; Stephen M. Deban SUMMARY Biotic factors such as body size and shape have long been known to influence kinematics in vertebrates. Movement in aquatic organisms can also be strongly affected by abiotic factors such as the viscosity of the medium. We examined the effects of both...

... seasonal droughts, and breathes air. Thus, the lungfish was an ideal organism for our study to determine the effects of a wide range of viscosities on lateral undulatory swimming and to simulate some of the muddy conditions early tetrapods may have encountered. Regardless of viscosity, several aspects...

...Lee A. Fuiman; Robert S. Batty ABSTRACT The influence of temperature-induced changes in water viscosity on the swimming performance and kinematics of larval Atlantic herring ( Clupea harengus ) was examined using high-speed video recording. The physical effects of viscosity were measured separately...

...Florence I. M. Thomas ABSTRACT Physical properties (density in kg m-3, viscosity, sinking rates and dispersion rate) of the gametes and associated spawned materials were measured for three species of sea urchin, Tripneustes gratilla, Echinometra mathaei and Colobocentrotus atratus , from habitats...

...Richard W. Brill; David R. Jones ABSTRACT The high cardiac output, arterial blood pressure and cardiac energy demand of tuna make it likely that blood viscosity has an important influence on cardiovascular function. Furthermore, tuna regularly subject themselves to ambient temperature changes of 10...

... that of adult erythrocytes. Hatchling erythrocyte mean cell volume is approximately half of the adult value, but hematocrit, blood hemoglobin concentration and blood viscosity of hatchlings and adults are similar. Oxygen-carrying capacity in green turtles, unlike that of other diving vertebrates, corresponds...

...R. D. Podolsky; R. B. Emlet ABSTRACT The small size and slow movement of aquatic, microscopic organisms means that the viscosity of water has a predominant influence on their motion. Temperature, through its effects on physiological processes, also influences motion. Because water viscosity...

... and slowed to no stretch at the peak of force. Since the mechanical impedance was constant while the stretch velocity changed, there was no significant viscosity present in the muscle. The tendon stretched by 3·2% at 7kmh −1 hopping and by 4·4% at 18kmh −1 hopping. Elastic energy storage in the tendons...

... ), it follows that blood flow rates will also be lower. One might therefore predict that the relatively low haematocrits in hagfish ( Johansen et al . 1962 ; Forster et al . 1989 ) and lack of plasma albumins ( Manwell, 1963 ) would maintain a relatively low blood viscosity at low flow rates when blood tends...

... (apparent in minutes) and reversible viscosity change. Artificial sea water (ASW) with a high concentration of Ca 2+ (50 mmol 1 − ’) increased the normal viscosity 9 times; Ca 2+ -free ASW decreased it to one-tenth. Ca 2+ was the only ion which caused a viscosity change whose range was as large as the range...