Bacteria have evolved advanced strategies for surviving during nutritional stress, including expression of specialized enzyme systems that allow them to grow on unusual nutrient sources. Inorganic phosphate (Pi) is limiting in most ecosystems, hence organisms have developed a sophisticated, enzymatic machinery known as carbon‐phosphorus (C‐P) lyase, allowing them to extract phosphate from a wide range of phosphonate compounds. These are characterized by a stable covalent bond between carbon and phosphorus making them very hard to break down. Despite the challenges involved (...) in both synthesizing and catabolizing phosphonates, they are widespread in nature. The enzymes required for the bacterial C‐P lyase pathway have been identified and for the most part structurally characterized. Nevertheless, the mechanistic principles governing breakdown of phosphonate compounds remain enigmatic. In this review, an overview of the C‐P lyase pathway is provided and structural aspects of the involved enzyme complexes are discussed with a special emphasis on the role of ATP‐binding cassette (ABC) proteins. (shrink)

Bacteria have evolved advanced strategies for surviving during nutritional stress, including expression of specialized enzyme systems that allow them to grow on unusual nutrient sources. Inorganic phosphate (Pi) is limiting in most ecosystems, hence organisms have developed a sophisticated, enzymatic machinery known as carbon‐phosphorus (C‐P) lyase, allowing them to extract phosphate from a wide range of phosphonate compounds. These are characterized by a stable covalent bond between carbon and phosphorus making them very hard to break down. Despite the challenges involved (...) in both synthesizing and catabolizing phosphonates, they are widespread in nature. The enzymes required for the bacterial C‐P lyase pathway have been identified and for the most part structurally characterized. Nevertheless, the mechanistic principles governing breakdown of phosphonate compounds remain enigmatic. In this review, an overview of the C‐P lyase pathway is provided and structural aspects of the involved enzyme complexes are discussed with a special emphasis on the role of ATP‐binding cassette (ABC) proteins. (shrink)

The consent process for publication of clinical images in medical journals varies widely. The extent of this variation is not known. It is also not known whether journals follow their own stated best practices or the guidance of the International Committee of Medical Journal Editors. We assessed consent requirements in a sample of 10 top impact factor general medicine journals that publish clinical images, examining variability in consent requirements for clinical image publication and congruence of requirements with the recommendations of (...) the ICMJE. Clinical image consent requirements varied widely from journal to journal. None of the studied journals, even amongst n = 4 ICMJE members or n = 8 journals who self-report adherence to ICMJE guidelines, comply with all of the recommendations of the ICMJE. Half of studied journals require a journal-specific consent form. Among top medical journals there is significant heterogeneity in consent requirements for clinical images. Variability of consent requirements is neither practical nor rational; inconsistent requirements create uncertainty for authors, present impediments to dissemination of scholarship, and undermine a shared professional understanding of how best to protect patient privacy. We propose adopting a standardized consent form and process for publication of identifiable images in medical journals, with uniform elements and explicit definitions. (shrink)

In a clear account of the mature theology of Thomas Aquinas the author, a theologian himself, reveals the evangelical, pastoral and theocentric character of Aquinas's pre-modern theology.

In lieu of an abstract, here is a brief excerpt of the content:INDIRECT METHODS IN THEOLOGY: KARL RAHNER AS AN AD HOC APOLOGIST NICHOLAS M. HEALY St. John's University Staten Island, New York THE PURPOSE of this paper is to discuss Karl Rahner's emarks upon, and use of, what he called ' indirect methds ' in theology.1 To my knowledge there has been little analysis, beyond incidental treatment, of Rahner's scattered references to these methods.2 In the following pages I (...) hope to remedy this gap, and argue for two interdependent theses : First, by construing Rahner's own theological practice in the light of his remarks on the indirect methods, an apologetic method can be discerned which could prove useful for contemporary theology. Second, reading Rahner from this perspective indicates that his apologetic method is much more situation-relative and occasionalist than has generally been recognized hitherto. Two Kinds of Apologetics A quick sketch of some aspects of the present theological scene will help make these theses a little clearer and provide some cate1 My discussion of the indirect methods is based primarily upon the following sources: Theological Investigations (New York: Crossroad, 1961-1982) (cited in the text as TI), vol. 6, " A Small Question Regarding the Contemporary Pluralism in the Intellectual Situation of Catholic and the Church", pp. 21-30; vol. 11, "Reflections on Methodology in Theology", pp. 68-114; vol. 16, "A New Task for Theology". Foundations of Christian Faith (New York: Crossroad, 1978) (henceforth cited as FCF), introduction, pp. 1-23, et passim. 2 See e.g., Anne Carr, The Theological Method of Karl Rahner (Missoula: Scholars Press, 1977), pp. 267-9; Francis S. Fiorenza, Foundational Theology: Jesus and the Church (New York: Crossroad, 1984) (cited as Fiorenza), p. 93. Both these interpreters consider the indirect methods to be synonymous with the transcendental method. They then interpret the former in terms of the latter, misguidedly, I will argue. 613 614 NICHOLAS M. HEALY gories for the following discussion. According to William Placher,8 the contemporary situation in North American theology is often characterized as one in which two rival models of theology are dominant, the revisionist and the post-liberal (Placher, 17-19). Placher discusses many aspects of each model; here I want to look only at those features which bear upon their different conceptions of the nature of apologetics. According to David Tracy, a leading practitioner of the revisionist model, theology in all its forms must be " determined by a relentless drive to genuine publicness ".4 In order to maintain its public character, theology, like any discipline, must develop a preliminary systematic argument by which to ground its possibility and to ·establish its claims to truth and meaningfulness. This initial apologetics uses universal categories and proceeds in accordance with general criteria, functioning in terms, that is, which " all reasonable persons, whether ' religiously involved ' or not, can recognize as reasonable" (Tracy, 57). Usually it takes the form of a foundational explanatory theory of religious discourse which appeals to the universal nature of the deep structures of religious experience. This general theory of religion provides criteria for the subsequent theology, thereby maintaining the latter's relevance for the general, non-Christian public. The theological method considered appropriate is one which attempts systematically to correlate Christian-specific claims with the deep structures of human experience.5 The post-liberal model, by comparison, is more concerned to preserve Christian identity than to maintain the publicness of Christian discourse. The task of theology is not primarily the apologetic one of justifying Christianity to a non-Christian puba Unapologetic Theology: A Christian Voice in a Pluralistic Conversation (Louisville: Westminster/John Knox Press, 1989) (cited as Placher). 4 David Tracy, The Analogical Imagination: Christian Theology and the Culture of Pluralism (New York: Crossroad, 1981), p. 31 (cited as Tracy). 5 See the analyses in, e.g., George A. Lindbeck, The Nature of Doctrine: Religion and Theology in a Postliberal Age (Philadelphia: Westminster Press, 1984), chapter 2; and Ronald F. Thiemann, Revelation and Theology: The Gospel as Narrated Promise (Notre Dame: U. of N. D. Press, 1985), chapter 4. KARL RAHNER AS AN AD HOC APOLOGIST 615 lie. Instead the theologian should critically " describe and redescribe the character and relationship of Christian beliefs and... (shrink)

Prominent philosophers have argued that contradictions contain either too much or too little information to be useful. We dispute this with what we call the “Paradox of the Two Firefighters.” Suppose you are awakened in your hotel room by a fire alarm. You open the door. You see three possible ways out: left, right, straight ahead. You see two firefighters. One says there is exactly one safe route and it is to your left. The other says there is exactly one (...) safe route and it is to your right. While the two firemen are giving you contradictory information, they are also both giving you the perhaps useful information that there is a safe way out and it is not straight ahead. We give two analyses. The first uses the “Opinion Tetrahedron,” introduced by Dunn as a generalization of Audun Jøsang’s “Opinion Triangle.” The Opinion Tetrahedron in effect embeds the values of the “Belnap-Dunn 4-valued Logic” into a context of subjective probability generalized to allow for degrees of belief, disbelief, and two kinds of uncertainty—that in which the reasoner has too little information and that in which the reasoner has too much information. Jøsang had only a single value for uncertainty. We also present an alternative solution, again based on subjective probability but of a more standard type. This solution builds upon “linear opinion pooling.” Kiefer had already developed apparatus for assessing risk using expert opinion, and this influences the second solution. Finally, we discuss how these solutions might apply to “Big Data” and the World Wide Web. (shrink)