RESUMEN
We find the spatial and dynamic embedding diagrams in stationary black hole spacetimes. The spatial embeddings include the NUT, pure NUT and Kerr spacetimes. In the case of pure NUT spacetime, the spatial embedding equations are solved in terms of the elliptic integrals. In other cases we obtain the spatial embedding diagrams by numerical integration of the corresponding embedding equations. These embedding diagrams are then compared through their Gaussian and mean curvatures. We also find the dynamic embedding diagrams of NUT and pure NUT spacetimes, and compare them with the dynamic embedding diagram of Schwarzschild spacetime.
RESUMEN
BACKGROUND: The shortage of living-related and cadaveric donors lead to living-unrelated kidney transplant in Iran. OBJECTIVE: We conducted this study to determine the motivations for unrelated-living kidney donation in Khuzestan province, southwestern Iran. METHODS: After obtaining an informed written consent, unrelated-living kidney donors were interviewed by the authors by means of a standardized questionnaire to assess their socioeconomic status and motivations for donation. RESULTS: 210 living kidney donors consisting of 167 men (79.5%) and 43 women (20.5%) with a mean±SD age of 28.4±5.6 years were studied. 117 (55.7%) donors were married. 6 (2.9%) of donors were university graduates; 39 (18.6%) high school graduates; 141 (67.1%) less than high school graduates; and 20 (9.5%) were illiterate. The motives for donation was mentioned mostly financial by 127 (60.5%) donors, mostly based on religious beliefs and altruism by 39 (18.6%), and a combination of financial, religious beliefs and altruism by 35 (16.7%) donors. CONCLUSION: Financial problems are the main motivation for living-unrelated kidney donation in Khuzestan province, southwestern Iran.