Lisa Borrero

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Electron probe analysis, cryo-ultramicrotomy, and freeze-substitution were used to determine the nature of vacuolation and the subcellular composition in fatigued frog skeletal muscle fibers. The vacuoles caused by fatigue were part of the T-tubule system and contained high concentrations of NaCl. The calcium concentration in the terminal cisternae was(More)
1. Fatigue curves were obtained on muscles contracting at length (L) different from the optimal (L(o)), and performing isometric tetani of fixed duration at regular intervals. Every sixth tetanus occurred at L(o), the remainder took place at L. The parameters of the fatigue curve were compared with those of controls contracting always at L(o). Fatigability(More)
T HE PENETRATION of capillary walls by water and dissolved substances appears to take place solely by processes which require no energy transformations on the part of the capillary endothelial cells. The rate of net fluid movement across the capillary wall has been shown to be simply proportional to the difference between hydrostatic and osmotic forces(More)
T HE PENETRATION of capillary walls by water and dissolved substances appears to take place solely by processes which require no energy transformations on the part of the capillary endothelial cells. The rate of net fluid movement across the capillary wall has been shown to be simply proportional to the difference between hydrostatic and osmotic forces(More)
1. The development of fatigue in isolated toad sartorius undergoing short, periodic, isometric tetani of controlled duration, was studied. Stimulation was direct and curare was used.2. In the great majority of cases extratension decreased very regularly towards a steady value, following a simple exponential equation.3. The final steady tension (expressed as(More)
We present a new scheme for a pump-probe mode-mismatched thermal lensing experiment aimed at extracting the value of low-absorbing components in the presence of a high-absorbing background. The method allows for the use of large path-length samples. Changes in the background absorption of a column of ethanol of 20 cm of 1% and a pollutant concentration(More)
Through this study we sought to understand the complex experience of retirement and the meaning of identity for women who recently retired from a professional career. Through the use of qualitative methods, including photo elicitation, journaling, and a series of two in-depth interviews with each of six women, a fluid description of the meaning of identity(More)