Protease activities were detected in quiescent and germinating spores of the ostrich fern (Matteuccia struthiopteris [L.] Todaro). Peak endopeptidase, aminopeptidase, and carboxypeptidase activities were detected 12 to 24 hours after spores began imbibing under light. There was a correlation between activities of proteases, the onset of a decline in levels of soluble protein, and an increase in...

In this paper, we modify the Harris-Todaro model of migration to incorporate the impact of human capital, housing stock and the availability of publicly provided goods like health care and road provision in order to analyse the determinants of migration in different regions of Poland. We apply the Seemingly Unrelated Regression Equation [SURE] model to investigate the data. Our results show tha...

Experiments were conducted in growth chambers to examine the effect of a mild water stress (-200 kilopascals polyethylene glycol) on frond elongation and water status of the ostrich fern (Matteuccia struthiopteris [L.] Todaro). Measurements were taken for two days, starting one day after the application of polyethylene glycol. Total water potential in control (well-watered) plants was always si...

13 Feder, L. S. and Laskin, D. L. (1994) J. Leukocyte Biol. 55, 507-513 14 Blouin, A., Bolender, R. P. and Weibel, E. R. (1977) J. Cell Biol. 72, 441-455 15 Nagura, H., Koshikawa, T., Fukuda, Y. and Asai, J. (1986) Virchow’s Arch. Pathol. [A] 409, 407-416 16 McCloskey, T. W., Todaro, J. A. and Laskin, D. L. (1992) Hepatology 16, 191-203 17 Spitzer, J. A., Zhang, P. and Mayer, A. M. S. (1994) J....

In the standard Harris–Todaro framework, migration flows arise as disequilibrium driven movements of the population. It is the purpose of this research to modify the simple dualistic model in order to account for the existence of permanent migrants, i.e., of individuals who work in another country without changing their original nationality. Or, in the rural–urban interpretation of the model, o...

The mechanism by which fully developed chloroplasts divide has been reported to consist of an initial constriction around the entire chloroplast, which is followed by a p inching into two daugh te r chloroplasts. Constr ict ion is accompanied by fusion of the inner and outer layers of the chloroplast membrane . Such a division has been documented by electron microscopy for the brown alga, Fucus...

Devices/Applications/Reliability 6111 Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS V (Tanner/Ramesham) 6112 Microfluidics, BioMEMS, and Medical Microsystems IV (Papautsky/Wang/Vauchier) 6113 MEMS/MOEMS Components and Their Applications III (Olivier/Tadigadapa/Henning) 6114 MOEMS, Display, Imaging, and Miniaturized Microsystems IV (Ürey/Dickensheets/Gogoi) Founding Chair M...