Christopher Hirst

Learn More
Stride duration, stance duration and protraction duration are key variables when describing the gaits of terrestrial animals. Together, they determine the duty factor (the fraction of the stride for which the limb maintains contact with the ground surface), from which the peak vertical force can be estimated. When an animal changes speed, these variables(More)
A biophysical model is derived to account for the temporal thermal change at the skin of the breast as a result of ultrasound stimulation at the suspect lesion for seven minutes, with responses recorded using an infrared camera. Twenty-two patients were studied. The observed temporal responses for malignant cases have a different pattern from those of the(More)
Free radicals, induced by ionising radiation or generated by chemical systems, are known to produce DNA damage that may result in mutation. An in vitro study was carried out to discover whether free radicals produced from water using kHz ultrasound increased the mutation rate of Salmonella typhimurium above the spontaneous reversion rate. Results showed(More)
Here we show that transport-generated phase separation at the air-liquid interface in systems containing self-assembling amphiphilic molecules and polymers can be controlled by the relative humidity (RH) of the air. We also show that our observations can be described quantitatively with a theoretical model describing interfacial phase separation in a water(More)
Polymer nanogels are embedded within layers consisting of a nonlamellar liquid crystalline lipid phase to act as thermoresponsive controllers of layer compactness and hydration. As the nanogels change from the swollen to the collapsed state via a temperature trigger, they enable on-demand release of water from the mixed polymer-lipid layer while the lipid(More)
Biological membranes do not only occur as planar bilayer structures, but depending on the lipid composition, can also curve into intriguing three-dimensional structures. In order to fully understand the biological implications as well as to reveal the full potential for applications, e.g. for drug delivery and other biomedical devices, of such structures,(More)
The structure and dynamics of nanostructure films formed by mixtures of soy phosphatidylcholine and glycerol dioleate at the silicon-aqueous interface were studied by grazing incidence neutron spin echo spectroscopy (GINSES), specular and off-specular neutron reflectometry, and small-angle X-ray diffraction. Reverse hexagonal (HII) and micellar cubic phase(More)
  • 1