Oxygenic photosynthesis is the principal producer of both oxygen and organic matter on earth. The primary step in this process—the conversion of sunlight into chemical energy—is driven by four multi‐subunit membrane protein complexes named photosystem I, photosystem II, cytochrome b6f complex and F‐ATPase. Photosystem I generates the most negative redox potential in nature and thus largely determines the global amount of enthalpy in living systems. The recent structural determination of PSI complexes from cyanobacteria and plants sheds light on the evolutionary (...) forces that shaped oxygenic photosynthesis. The fortuitous formation of our solar system in a space plentiful of elements, our distance from the sun and the long time of uninterrupted evolution enabled the perfection of photosynthesis and the evolution of advanced organisms. The available structural information complements the knowledge gained from genomic and proteomic data to illustrate a more precise scenario for the evolution of life systems on earth. BioEssays 27:914–922, 2005. © 2005 Wiley Periodicals, Inc. (shrink)

ḥeleḳ rishon. Sheʼelot u-teshuvot be-ʻinyanim shonim mi-toratenu ha-ḳedoshah shebi-khetav ṿeshe-be-ʻal peh -- ḥeleḳ sheni. Leḳet mikhtavim u-maʼamarim le-ḥizuḳ ṿe-hitʻorerut ba-ʻavodat ha-Shem yitbarakh -- ḥeleḳ shelishi. Leḳet mikhtavim me-a.m. ṿe-r. ha-Rav Ḥayim Shaʼul z. l.l. h.h. Grainiman baʻal ha-ḥidushim u-veʼurim".

When a nation declares war, it rarely takes time to define the concept. When a peace treaty is signed, governments and peoples assume that they know what to exp.

When a nation declares war, it rarely takes time to define the concept. When a peace treaty is signed, governments and peoples assume that they know what to exp.

To what extent do we know our own minds when making decisions? Variants of this question have preoccupied researchers in a wide range of domains, from mainstream experimental psychology to cognitive neuroscience and behavioral economics. A pervasive view places a heavy explanatory burden on an intelligent cognitive unconscious, with many theories assigning causally effective roles to unconscious influences. This article presents a novel framework for evaluating these claims and reviews evidence from three major bodies of research in which unconscious factors (...) have been studied: multiple-cue judgment, deliberation without attention, and decisions under uncertainty. Studies of priming and the role of awareness in movement and perception are also given brief consideration. The review highlights that inadequate procedures for assessing awareness, failures to consider artifactual explanations of “landmark” results, and a tendency to uncritically accept conclusions that fit with our intuitions have all contributed to unconscious influences being ascribed inflated and erroneous explanatory power in theories of decision making. The review concludes by recommending that future research should focus on tasks in which participants' attention is diverted away from the experimenter's hypothesis, rather than the highly reflective tasks that are currently often employed. (shrink)

The majority of people show persistent poor performance in reasoning about “stock-flow problems” in the laboratory. An important example is the failure to understand the relationship between the “stock” of CO2 in the atmosphere, the “inflow” via anthropogenic CO2 emissions, and the “outflow” via natural CO2 absorption. This study addresses potential causes of reasoning failures in the CO2 accumulation problem and reports two experiments involving a simple re-framing of the task as managing an analogous financial budget. In Experiment 1 a (...) financial version of the task that required participants to think in terms of controlling debt demonstrated significant improvements compared to a standard CO2 accumulation problem. Experiment 2, in which participants were invited to think about managing savings, suggested that this improvement was fortuitous and coincidental rather than due to a fundamental change in understanding the stock-flow relationships. The role of graphical information in aiding or abetting stock-flow reasoning was also explored in both experiments, with the results suggesting that graphs do not always assist understanding. The potential for leveraging the kind of reasoning exhibited in such tasks in an effort to change people's willingness to reduce CO2 emissions is briefly discussed. (shrink)

We argue that: (1) disappointment in the effectiveness of i-frame interventions depends on realistic expectations about how they could work; (2) opportunities for system reform are rare, and i-frame interventions can lay important groundwork; (3) Chater & Loewenstein's evidence that i-frame interventions detract from s-frame approaches is limited; and (4) nonetheless, behavioural scientists should consider what more they can contribute to systemic reforms.

We connect Conviction Narrative Theory to an account that views people as intuitive scientists who can flexibly create, evaluate, and modify representations of decision problems. We argue that without understanding how the relevant complex narratives (or indeed any representation, simple to complex) are themselves constructed, we also cannot know when and why people would rely on them to make choices.

The place of gilds in urban politics has recently attracted considerable interest. Scholars have come to view these organizations, especially those associated with the crafts, as powerful vehicles for influencing municipal affairs. No agreement about the nature of this influence has yet emerged; indeed, gilds have been variously interpreted as promoters of political brotherhood, allies of worker interests, and devices used by urban elites to control artisans and laborers. The prevalence of a different sort of influence has gone largely unnoticed, (...) however. In many English towns of the late Middle Ages a single fraternity came to dominate local government. (shrink)

Citizenship under Fire examines the relationship among civic education, the culture of war, and the quest for peace. Drawing on examples from Israel and the United States, Sigal Ben-Porath seeks to understand how ideas about citizenship change when a country is at war, and what educators can do to prevent some of the most harmful of these changes.Perhaps the most worrisome one, Ben-Porath contends, is a growing emphasis in schools and elsewhere on social conformity, on tendentious teaching of history, and (...) on drawing stark distinctions between them and us. As she writes, "The varying characteristics of citizenship in times of war and peace add up to a distinction between belligerent citizenship, which is typical of democracies in wartime, and the liberal democratic citizenship that is characteristic of more peaceful democracies."Ben-Porath examines how various theories of education--principally peace education, feminist education, and multicultural education--speak to the distinctive challenges of wartime. She argues that none of these theories are satisfactory on their own theoretical terms or would translate easily into practice. In the final chapter, she lays out her own alternative theory--"expansive education"--which she believes holds out more promise of widening the circles of participation in schools, extending the scope of permissible debate, and diversifying the questions asked about the opinions voiced. (shrink)

Maimonides’ Latin translation of Moreh Nevukhim | Guide for the Perplexed, was the most influential Jewish work in the last millennia (Di Segni, 2019; Rubio, 2006; Wohlman, 1988, 1995; Kohler, 2017). It marked the beginning of scholasticism, a daughter of Judaism raised by Jewish thinkers, according to historian Heinrich Graetz (Geschichte der Juden, L. 6, Leipzig 1861, p. xii). Printed by Gutenberg's first mechanical press, its influence in the West went as far as the Fifth Lateran Council (1512 — 1517) (...) "where scholars were encouraged to remove the difficulties which seemed to divide the whole of theology and philosophy (Leibniz, Théodicée, 11)." For centuries, the Guide revolutionized the curriculum of school instruction by reintegrating the natural laws of thought in the sphere of faith (the fourth of which became Leibniz’ Principle of sufficient reason). This complete collection of notes expounds the ideas of the Guide and features all the passages selected and rewritten by Leibniz. This first complete annotated bilingual translation of the original manuscripts in Latin serves as an entry point to the faith in conformity with Reason. This complete collection of notes expounds the ideas of the Guide as selected and rewritten by Leibniz, the famous mathematician inventor of computer arithmetic, considered the last universal genius. The first complete bilingual translation in three centuries features on the front cover Rembrandt's Philosopher in meditation, and a recommendation from Leibniz's himself on the back: "Rabbi Maimonides' excellent book, A Guide for the Perplexed, is more philosophical than I imagined and worthy of careful reading." According to Malbim’s translator, Noah Rosenbloom, the book’s epigraph indicates that nineteenth-century Rabbi Leibush ben Yehiel Michel Wisser, also known as Malbim, was familiar with Leibniz’ Theodicy. In Leibniz’ anthology of the Guide, the reader can get a detailed glimpse of Leibniz' impressions of Maimonides. The Foreword by Leibniz' translator Lloyd Strickland suggests that there were sympathies and perhaps even overlaps between the thoughts of both universal luminaries. -/- . (shrink)

The last 15 years have seen a remarkable set of changes in the global business environment. Established companies and start-ups alike have been subjected to some fundamental shifts in the very way that we conceptualize business. Together with some generational challenges we have seen myriad calls for a new narrative about business. And, even more recently, the COVID pandemic has reinforced a number of these shifts and led to even more fundamental change. The purpose of this essay is to outline (...) these challenges to the dominant narrative about business and to suggest that it is no longer a useful way to think about value creation and trade (business). (shrink)

We focus on two issues: (1) an unusual, counterintuitive prediction that quantum probability (QP) theory appears to make regarding multiple sequential judgments, and (2) the extent to which QP is an appropriate and comprehensive benchmark for assessing judgment. These issues highlight how QP theory can fall prey to the same problems of arbitrariness that Pothos & Busemeyer (P&B) discuss as plaguing other models.

Mitchell et al. present a lucid and provocative challenge to the claim that links between mental representations are formed automatically. However, the propositional approach they offer requires clearer specification, especially with regard to how propositions and memories interact. A definition of a system would also clarify the debate, as might an alternative technique for assessing task.

School choice is most often viewed through the lens of provision: most of the debate on the issue searches for desirable ways to offer vouchers, scholarships or other tools that provides choice as a way to achieve equality and/or freedom. This paper focuses on the consumer side of school choice, and utilises behavioural economics as well as ethnographic and network studies to consider ways to structure choice which respond to actual cognitive and social processes of choice. These empirical studies give (...) scholars and policy-makers who grapple with school choice a perspective that should affect the principled design of these programs as well as their execution. The paper considers the ways in which actual choice processes should affect current visions of school choice. It concludes with recommendations concerning the design of choice sets and the accessibility of information regarding choice, which together can assist school choice policies in better fulfilling their promise of equality and freedom. (shrink)

Objectives To conduct an independent evaluation of the first phase of the Health Foundation’s Safer Patients Initiative (SPI), and to identify the net additional effect of SPI and any differences in changes in participating and non-participating NHS hospitals. Design Mixed method evaluation involving five substudies, before and after design. Setting NHS hospitals in the United Kingdom. Participants Four hospitals (one in each country in the UK) participating in the first phase of the SPI (SPI1); 18 control hospitals. Intervention The SPI1 (...) was a compound (multi-component) organisational intervention delivered over 18 months that focused on improving the reliability of specific frontline care processes in designated clinical specialties and promoting organisational and cultural change. Results Senior staff members were knowledgeable and enthusiastic about SPI1. There was a small (0.08 points on a 5 point scale) but significant (P<0.01) effect in favour of the SPI1 hospitals in one of 11 dimensions of the staff questionnaire (organisational climate). Qualitative evidence showed only modest penetration of SPI1 at medical ward level. Although SPI1 was designed to engage staff from the bottom up, it did not usually feel like this to those working on the wards, and questions about legitimacy of some aspects of SPI1 were raised. Of the five components to identify patients at risk of deterioration—monitoring of vital signs (14 items); routine tests (three items); evidence based standards specific to certain diseases (three items); prescribing errors (multiple items from the British National Formulary); and medical history taking (11 items)—there was little net difference between control and SPI1 hospitals, except in relation to quality of monitoring of acute medical patients, which improved on average over time across all hospitals. Recording of respiratory rate increased to a greater degree in SPI1 than in control hospitals; in the second six hours after admission recording increased from 40% (93) to 69% (165) in control hospitals and from 37% (141) to 78% (296) in SPI1 hospitals (odds ratio for “difference in difference” 2.1, 99% confidence interval 1.0 to 4.3; P=0.008). Use of a formal scoring system for patients with pneumonia also increased over time (from 2% (102) to 23% (111) in control hospitals and from 2% (170) to 9% (189) in SPI1 hospitals), which favoured controls and was not significant (0.3, 0.02 to 3.4; P=0.173). There were no improvements in the proportion of prescription errors and no effects that could be attributed to SPI1 in non-targeted generic areas (such as enhanced safety culture). On some measures, the lack of effect could be because compliance was already high at baseline (such as use of steroids in over 85% of cases where indicated), but even when there was more room for improvement (such as in quality of medical history taking), there was no significant additional net effect of SPI1. There were no changes over time or between control and SPI1 hospitals in errors or rates of adverse events in patients in medical wards. Mortality increased from 11% (27) to 16% (39) among controls and decreased from 17% (63) to 13% (49) among SPI1 hospitals, but the risk adjusted difference was not significant (0.5, 0.2 to 1.4; P=0.085). Poor care was a contributing factor in four of the 178 deaths identified by review of case notes. The survey of patients showed no significant differences apart from an increase in perception of cleanliness in favour of SPI1 hospitals. Conclusions The introduction of SPI1 was associated with improvements in one of the types of clinical process studied (monitoring of vital signs) and one measure of staff perceptions of organisational climate. There was no additional effect of SPI1 on other targeted issues nor on other measures of generic organisational strengthening. (shrink)

This paper explores some general considerations bearing on the question of whether virtue can be measured. What is moral virtue? What are measurement and evaluation, and what do they presuppose about the nature of what is measured or evaluated? What are the prospective contexts of, and purposes for, measuring or evaluating virtue, and how would these shape the legitimacy, methods, and likely success of measurement and evaluation? We contrast the realist presuppositions of virtue and measurement of virtue with the behavioral (...) operationalism of a common conception of measurement in psychometrics. We suggest a realist and non-reductive conceptualization of the measurability of virtue. We then discuss three possible educational contexts in which the measurement of virtue might be pursued: high-stakes testing and accountability schemes, the evaluation of programs in character education, and routine student evaluation. We argue that high-stakes testing of virtue would be ill-advised and counterproductive. We make some suggestions for how program evaluation in character education might proceed, and offer some examples of evaluation of student virtue-related learning. We conclude that virtue acquisition might be measured in a population of students accurately enough for program evaluation, while also arguing that student and program evaluation do not require comprehensive evaluations of how virtuous individual students are. Routine student evaluation will typically focus on specific aspects of virtue acquisition, and program evaluations can measure the aggregate progress of virtue acquisition in all its aspects while evaluating only limited aspects of the learning of individual students. (shrink)