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PubMed2003

Artificial life: organization, adaptation and complexity from the bottom up.

Artificial life attempts to understand the essential general properties of living systems by synthesizing life-like behavior in software, hardware and biochemicals. As many of the essential abstract properties of living systems (e.g. autonomous adaptive and intelligent behavior) are also studied by cognitive science, artificial life and cognitive science have an essential overlap. This review highlights the state of the art in artificial life with respect to dynamical hierarchies, molecular self-organization, evolutionary robotics, the evolution of complexity and language, and other practical applications. It also speculates about future connections between artificial life and cognitive science.

Journal Article↗
PubMed1998

Long-term mechanical circulatory support system reliability recommendation: American Society for Artificial Internal Organs and The Society of Thoracic Surgeons: long-term mechanical circulatory support system reliability recommendation.

Jointly developed by members of the American Society for Artificial Internal Organs and the Society of Thoracic Surgeons along with staff from the Food and Drug Administration, the National Heart, Lung and Blood Institute and other experts, this recommendation describes the reliability considerations and goals for Investigational Device Exemption and Premarket Approval submissions for long-term, mechanical circulatory support systems. The recommendation includes a definition of system failure, a discussion of an appropriate reliability model, a suggested in vitro reliability test plan, reliability considerations for animal implantation tests, in vitro and animal in vivo performance goals, the qualification of design changes during the Investigational Device Exemption clinical trial, the development of a Failure Modes Effects and Criticality Analysis, and the reliability information for surgeons and patient candidates. The document will be periodically reviewed to assess its timeliness and appropriateness within five years.

Animals↗
PubMed2002

[Division of gastroenterological surgery].

Regenerative medicine and artificial organs are fields of development in the 21st century. Various stem cells are found in many organs, and it is expected that medical treatment with the induction of regeneration in vivo and ex vivo using growth factors will be available. On the other hand, human embryonic stem cell lines (ES cells), which can transform themselves into any cell in the body, have been established. Since the development of cloning technology, the production of "individual ES cells" is also no longer only a dream. At the same time, the use of human cloned embryos entails important ethical and social considerations. As is well known, although artificial organs are not perfect, they can substitute for the functions of the kidney and heart. In the future, miniaturization and advanced features can be expected by application of microtechnologies. To execute various functions of synthesis and metabolic processes, for example, with an artificial liver, hybrid artificial organs incorporating cell functions are in development. We should not use animal cells because of unknown infectious diseases. It is therefore desirable to use human cells by the application of regenerative medicine or genetic engineering. Because both regenerative medicine and artificial organs can be expected to change medical treatment dramatically in the 21st century, steady efforts to clarify cell functions and molecular mechanisms will be required, as well as addressing ethical/social considerations.

Animals↗
PubMed2005

Development of polymer membranes with improved haemocompatibility for biohybrid organ technology.

Biomedical technology has opened up possibilities of treating the failure of internal organs like kidney and liver by artificial organ therapy. Most of these techniques are based on polymer membranes, which allow the removal of excess of water, salts and toxins from the circulation. However, haemodialysis for the replacement of kidney function results in an increased morbidity and mortality of patients after long-term application. Conventional therapy, such as haemofiltration for the treatment of acute liver failure does not improve significantly the survival rate of patients. Biohybrid organ support as a combination of the artificial organ therapy with the functional activity of immobilised cells seems to be a solution of the problem. Membranes applied in these devices have to face both tissue cells and blood. Organ cells in biohybrid organs have to make intimate contact with the surface of membrane but must also develop close cell-cell-connections as a prerequisite for their survival and high functional activity. Blood to be detoxified will contact the other side of membrane and may not become activated by the synthetic material. New polymer membranes based on acrylonitrile were developed to address these requirements by tailoring the composition of copolymers and to be applied in a specific hollow fibre bioreactor with an outer fibre for blood contact, and an inner fibre for tissue contact or vice versa.

Animals↗
PubMed1995

[Cardiovascular biomaterials].

Hemocompatible biomaterials, i.e. materials to be used in a biological environment, are of various origins (biological, synthetic). The great variety of physical and chemical characteristics has allowed design of various prosthesis and artificial organs. Use of biomaterials and artificial organs has made possible the development of substitutive therapies, a growing component of medical care. None of the biomaterials presently used is ideal. Everyone of them is responsible for a local and general reaction: foreign body reaction, coagulation, whole body inflammatory response. For years, these reactions have been poorly understood and development was of a very empirical nature. Progress in cellular and molecular biology permits today a better understanding of the mechanisms involved in these reactions. Use of biomaterials is facing to day a difficult problem; liability concerns threaten further developments and leads to market withdrawal of major basic materials.

Biocompatible Materials↗
PubMed2001

Overview of progeny-test programs of artificial-insemination organizations in the United States.

Characteristics of progeny-test (PT) programs of artificial insemination (AI) organizations in the United States were examined for changes since 1960. Mean number of bulls that were progeny tested annually by major AI organizations during the mid 1990s was 11 for Ayrshires, 24 for Brown Swiss, 21 for Guernseys, 1261 for Holsteins, 112 for Jerseys, and 3 for Milking Shorthorns. Mean parent age at progeny-test (PT) bull birth decreased except for Milking Shorthorns; mean age of maternal grandsire at bull birth decreased for Holsteins and Jerseys but increased for other breeds. For Holsteins, mean ancestor ages at PT bull birth were 85 mo for sires, 47 mo for dams, and 136 mo for maternal grandsires during the mid 1990s. Percentage of PT bulls that resulted from embryo transfer increased to 78% for Brown Swiss and 80% for Holsteins by 1999. Inbreeding in PT bulls increased over time and ranged from 3.8% for Brown Swiss to 6.4% for Jerseys (5.6% for Holsteins) during the mid 1990s. Mean numbers of daughters and herds per PT bull generally declined except for Holsteins, which increased during the early 1990s to 61 daughters and 44 herds. Mean number of states in which PT daughters are located increased; for Holstein PT bulls during 1994, 22% of daughters were in California, 13% in Wisconsin, 12% in New York, and 10% in Pennsylvania and Minnesota. Percentage of first-lactation cows that were PT daughters increased and ranged from 6% for Milking Shorthorns to 22% for Ayrshires (14% for Holsteins) during 1998. Percentage of PT daughters that were registered declined and was 19% for Holsteins and around 80% for other breeds.

Age Factors↗
PubMedDate not supplied

Long-term mechanical circulatory support system reliability recommendation: American Society for Artificial Internal Organs and Society of Thoracic Surgeons: long-term mechanical circulatory support system reliability recommendation.

Jointly developed by members of the American Society for Artificial Internal Organs and the Society of Thoracic Surgeons along with staff from the Food and Drug Administration, the National Heart, Lung and Blood Institute and other experts, this recommendation describes the reliability considerations and goals for Investigational Device Exemption and Premarket Approval submissions for long-term, mechanical circulatory support systems. The recommendation includes a definition of system failure, a discussion of an appropriate reliability model, a suggested in vitro reliability test plan, reliability considerations for animal implantation tests, in vitro and animal in vivo performance goals, the qualification of design changes during the Investigational Device Exemption clinical trial, the development of a Failure Modes Effects and Criticality Analysis, and the reliability information for surgeons and patient candidates. The document will be periodically reviewed to assess its timeliness and appropriateness within five years.

Clinical Trials as Topic↗