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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature medicine 11 (2005), S. 1026-1028 
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Much about stem cells is controversial. For example, even the question 'what is a stem cell?' arouses controversy. One definition of stem cells is that they are “primal undifferentiated cells which retain the ability to differentiate into other cell types...[which] allows them to act as a ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Bioethics 9 (1995), S. 0 
    ISSN: 1467-8519
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Philosophy
    Notes: For nearly two decades, the process of reviewing the ethical merit of research involving human subjects has been based on the application of principles initially described in the U.S. National Commission's Belmont Report, and later articulated more fully by Beauchamp and Childress in their Principles of Biomedical Ethics. Recently, the use of ethical principles for deliberating about moral problems in medicine and research, referred to in the pejorative sense as “principlism”, has come under scrutiny. In this paper we argue that these principles can provide a foundation for the source of ethical appraisal of human research, but are not themselves wholly adequate for this purpose. Therefore, we further propose that (1) principles should be understood as heuristics that can be “specified” as described by DeGrazia (1992), and (2) that the principle-based approach should be supplemented by formally incorporating “sensitivity to context” into the evaluation of clinical trials
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-7225
    Keywords: Canada ; cancer prevention ; clinical trials ; dietary fat ; females ; participation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Little research has been undertaken to determine why healthy people agree to enroll in randomized controlled trials of cancer prevention. This study describes the beliefs of Canadian women participating in a trial designed to determine the effect of reducing dietary fat on the development of breast cancer. Healthier eating, nutritional counseling, contributing to science, and helping others were the most frequently cited advantages of participation. Weight control and general better health were specifically associated with the dietary regimens. Attending appointments and difficulties when eating out were the main disadvantages of participation. Suggestions that would promote adherence to the trial protocol also were elicited. Responses cited most often included opportunities to meet other participants, more nutritional counseling (particularly psychological tips), updates about the trial, and more recipes. Attention should be paid to these suggestions as they characterize some of the major determinants of adherence behavior.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 102 (1980), S. 217-222 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Blast cells from patients with Acute Myeloblastic Leukemia (AML) were separated according to cell size using velocity sedimentation under unit gravity. Fractions obtained in this way were plated in methyl cellulose with a growth stimulator present in media conditioned by leukocytes in the presence of phytohemagglutinin (PHA-LCM). Colonies of blast cells form under these conditions. Pooled cell suspensions from such colonies were plated in microwells; the plating efficiency of such suspensions is a measure of blast progenitor self-renewal occurring in the original blast colonies. Self-renewal assays on each fraction indicated that self renewal among blast progenitors is heterogeneously distributed with subpopulations differing in renewal capacities. The results are consistent with the view that blast cell subpopulations in AML undergo a series of transitions associated with decreasing self renewal capacity, analogous to that observed in normal hemopoiesis, where proliferative capacity decreases with increasing differentiation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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