President Bush Vetoes Expansion of Federal Stem Cell Funding

2006 ◽  
Vol 37 (9) ◽  
pp. 3
Author(s):  
TODD ZWILLICH
Keyword(s):  
BMJ ◽  
2001 ◽  
Vol 323 (7309) ◽  
pp. 357-357 ◽  
Author(s):  
C. Marwick

2004 ◽  
Vol 32 (2) ◽  
pp. 307-314 ◽  
Author(s):  
R. Alta Charo

In August 2001,just after President Bush announced his stem cell funding policy and the creation of a new Presidents Council on Bioethics PCB), the new chair of the PCB, Leon Kass, set out his philosophy for constructing public bioethics bodies: There are several ways of running commissions, he said. One is to stack it with your people, make them homogenous, and force a consensus. Another is to make them heterogeneous, so that you can only come to the lowest common denominator. We re not going to adopt either . We are going to allow the debate to be developed and heard. Now, three years, sixteen meetings, and five reports later, there are nagging questions about whether this council indeed has allowed the debate to be developed and heard. And the charge of politicizing public bioethics to a degree heretofore unknown and stifling the voices of dissenting members comes not from the political left but from President Bushs own appointees, including one scientist who was dismissed from further service.


2020 ◽  
Author(s):  
Min Ji Han ◽  
Won Ji Lee ◽  
Joonhyuk Choi ◽  
Yean Ju Hong ◽  
Sang Jun Uhm ◽  
...  

Author(s):  
D.E. Philpott ◽  
W. Sapp ◽  
C. Williams ◽  
J. Stevenson ◽  
S. Black ◽  
...  

Spermatogonial stem-cell survival after irradiation injury has been studied in rodents by histological counts of surviving cells. Many studies, including previous work from our laboratory, show that the spermatogonial population demonstrates a heterogeneous response to irradiation. The spermatogonia increase in radio-sensitivity as differentiation proceeds through the sequence As - Apr - A1 - A2 - A3 - A4 - In - B. The stem (As) cell is the most resistant and the B cell is the most sensitive. The purpose of this work is to investigate the response of spermatogonial cell to low doses (less than 10 0 rads) of helium particle irradiation.


Author(s):  
D. E. Philpott ◽  
W. Sapp ◽  
C. Williams ◽  
Joann Stevenson ◽  
S. Black

The response of spermatogonial cells to X-irradiation is well documented. It has been shown that there is a radiation resistent stem cell (As) which, after irradiation, replenishes the seminiferous epithelium. Most investigations in this area have dealt with radiation dosages of 100R or more. This study was undertaken to observe cellular responses at doses less than 100R of X-irradiation utilizing a system in which the tissue can be used for light and electron microscopy.Brown B6D2F1 mice aged 16 weeks were exposed to X-irradiation (225KeV; 15mA; filter 0.35 Cu; 50-60 R/min). Four mice were irradiated at each dose level between 1 and 100 rads. Testes were removed 3 days post-irradiation, fixed, and embedded. Sections were cut at 2 microns for light microscopy. After staining, surviving spermatogonia were identified and counted in tubule cross sections. The surviving fraction of spermatogonia compared to control, S/S0, was plotted against dose to give the curve shown in Fig. 1.


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