Physical Phenomena 491 articles
- Astronomical Phenomena
- Biophysical Phenomena
- Electromagnetic Phenomena
- Elementary Particles
- Geological Phenomena
- Mechanical Phenomena
Physical constraints in the condensation of eukaryotic chromosomes. Local concentration of DNA versus linear packing ratio in higher order c...
The local concentration of DNA in metaphase chromosomes of different organisms has been determined in several laboratories. The average of these measurements is 0.17 g/mL. In the first level of chromosome condensation, DNA is wrapped around histones forming nucleosomes. This organization limits the...
An investigation into the use of polymer gel dosimetry in low dose rate brachytherapy.
An investigation has been carried out into the properties of the BANG polymer gel and its use in the dosimetry of low dose rate brachytherapy. It was discovered that the response of the gel was reproducible and linear to 10 Gy. The gel was found to be tissue equivalent with a respons...
[Leak detector in medical gas delivery systems].
We describe an original device developed by the biomedical technicians of the University Hospital of Nancy for checking tightness and measuring the capacity of medical gas pipeline network. A leak can be assessed either as a loss of pressure or as a loss of volume per unit of time (cmH2O.min-1 and m...
[Self-organization of protein structures--a bridge between physics and biology].
A nuclear mass spectrometer for studying radon progeny clusters.
A Nuclear Mass Spectrometer (NMS) system was developed and used to investigate the cluster formation of radon progeny (218Po) in gaseous H2O and H2O-SO2 environments. This NMS combines the mass-separation ability of a mass spectrometer and the low detection limit of a surface barrier detector for al...
Video observations, atmospheric path, orbit and fragmentation record of the fall of the Peekskill meteorite.
Our observations are the first video records of a bright fireball and the first motion pictures of a fireball with an associated meteorite fall....
A laser-induced ultrasonic probe of the mechanical properties of aligned lipid multibilayers.
The recently developed laser-induced phonon spectroscopy (LIPS) technique is applied to the determination of dynamic mechanical properties of aligned dilauroylphosphatidylcholine (DLPC) multibilayer arrays containing 2 and 20% water by weight. Sample excitation by two crossed 100-ps laser pulses gen...
The application of ultrasonics has been one of the major developments in ophthalmology in the last two decades. Diagnostic ultrasound of the eye and orbit, together with ocular biometry (especially in the field of lens implantation), are now routine investigations, while ultrasonic s...
A detailed re-evaluation of Clambda and Ce with application to ferrous sulphate G-values.
The theoretical basis of Clambda and Ce is re-examined and consistent expressions derived involving the quantity Fwa which is a combination of a stopping-power ratio and an energy-absorption coefficient ratio, thereby taking into account the extent to which the ionisation chamber act...
The nature and mode of action of tissue conditioners.