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The invention of blue and purple pigments in ancient times.

This tutorial review examines manmade blue and purple pigments appearing in antiquity. They were obtained by chemical synthesis from mineral starting materials and refer to chemical compounds: Egyptian Blue (CaCuSi4O10), Han Blue (BaCuSi4O10) and Han Purple (BaCuSi2O6), Maya Blue (x.indigo.(Mg,Al)4Si8(O,OH,H2O)24) and Ultramarine Blue (Na,Ca)8(AlSiO12)(S, SO4,Cl). The Egyptian and Chinese copper-based pigments are assumed to have been developed independently and are presumably an outcome of the historical developments in glazing techniques. A technology transfer from Egypt into China cannot be fully excluded but, based on the facts acquired up to now, looks less probable.

Art↗

Technology and humane nursing care: (ir)reconcilable or invented difference?

UNLABELLED: AIM(S) OF THE PAPER: This paper questions the validity of a boundary presumed to exist between technology and humane care. It argues the need for reconciliation of presumed tension(s) between technology and person focused care and the need to reconsider our ways of understanding the relations between technology and nursing. BACKGROUND/RATIONALE: Recent scholarship in the social sciences related to reproductive and imaging technologies and emergency resuscitation are examined and arguments are presented that question the appropriateness of a humanist view that emphasizes technology on the nonhuman and nonnatural side of a human/nonhuman, nature/artifice divide. It is argued that what determines experiences such as dehumanization is not technology per se but how individual technologies are used and operate in specific user contexts, the meanings that are attributed to them, how individuals or cultural groups define what is human, and the organizational, human, political and economic technological system (technique) that creates rationale and efficient order within nursing, health care and society. CONCLUSION: The paper concludes by asking whether the commonplace appeal to resolve tensions between humane care and technology has erroneously highlighted technology as the reason for impersonal care, and encourages re-examination of the relationship(s) between technology, humane care and nursing practice.

Conflict, Psychological↗

Inventing international nursing: the first decade (1899-1910).

Below, a window is opened on some of the thoughts of ICN founders as they planned and worked at the turn of the 20th century and how they viewed themselves and nursing, based on a detailed written record of their first substantial discussions about broad nursing issues.

History, 19th Century↗

Inventing our future: training the next generation of surgeon innovators.

Current surgical care and technology has evolved over the centuries from the interplay between creative surgeons and new technologies. As both fields become more specialized, that interplay is threatened. A 2-year educational fellowship is described which teaches both the process and the discipline of medical/surgical device innovation. Multi-disciplinary teams (surgeons, engineers, business grads) are assembled to educate a generation of translators, who can bridge the gap between scientific and technologic advances and the needs of the physician and the patient.

Child↗

When contemporary aminoacyl-tRNA synthetases invent their cognate amino acid metabolism.

Faithful protein synthesis relies on a family of essential enzymes called aminoacyl-tRNA synthetases, assembled in a piecewise fashion. Analysis of the completed archaeal genomes reveals that all archaea that possess asparaginyl-tRNA synthetase (AsnRS) also display a second ORF encoding an AsnRS truncated from its anticodon binding-domain (AsnRS2). We show herein that Pyrococcus abyssi AsnRS2, in contrast to AsnRS, does not sustain asparaginyl-tRNAAsn synthesis but is instead capable of converting aspartic acid into asparagine. Functional analysis and complementation of an Escherichia coli asparagine auxotrophic strain show that AsnRS2 constitutes the archaeal homologue of the bacterial ammonia-dependent asparagine synthetase A (AS-A), therefore named archaeal asparagine synthetase A (AS-AR). Primary sequence- and 3D-based phylogeny shows that an archaeal AspRS ancestor originated AS-AR, which was subsequently transferred into bacteria by lateral gene transfer in which it underwent structural changes producing AS-A. This study provides evidence that a contemporary aminoacyl-tRNA synthetase can be recruited to sustain amino acid metabolism.

Amino Acid Sequence↗

Star scientists and institutional transformation: patterns of invention and innovation in the formation of the biotechnology industry.

The most productive ("star") bioscientists had intellectual human capital of extraordinary scientific and pecuniary value for some 10-15 years after Cohen and Boyer's 1973 founding discovery for biotechnology [Cohen, S., Chang, A., Boyer, H. & Helling, R. (1973) Proc. Natl. Acad. Sci. USA 70, 3240-3244]. This extraordinary value was due to the union of still scarce knowledge of the new research techniques and genius and vision to apply them in novel, valuable ways. As in other sciences, star bioscientists were very protective of their techniques, ideas, and discoveries in the early years of the revolution, tending to collaborate more within their own institution, which slowed diffusion to other scientists. Close, bench-level working ties between stars and firm scientists were needed to accomplish commercialization of the breakthroughs. Where and when star scientists were actively producing publications is a key predictor of where and when commercial firms began to use biotechnology. The extent of collaboration by a firm's scientists with stars is a powerful predictor of its success: for an average firm, 5 articles coauthored by an academic star and the firm's scientists result in about 5 more products in development, 3.5 more products on the market, and 860 more employees. Articles by stars collaborating with or employed by firms have significantly higher rates of citation than other articles by the same or other stars. The U.S. scientific and economic infrastructure has been particularly effective in fostering and commercializing the bioscientific revolution. These results let us see the process by which scientific breakthroughs become economic growth and consider implications for policy.

Academies and Institutes↗