An Introduction to Nonlinear Chemical Dynamics

1998 ◽  
Author(s):  
Irving R. Epstein ◽  
John A. Pojman
Keyword(s):  
Flow Reactor ◽  
Chemical Dynamics ◽  
Design Data ◽  
Chemical Oscillators ◽  
Starting Point ◽  
Hands On ◽  
Undergraduate Laboratory ◽  
History Of ◽  
Mechanistic Basis ◽  
Nonlinear Chemical Dynamics

Just a few decades ago, chemical oscillations were thought to be exotic reactions of only theoretical interest. Now known to govern an array of physical and biological processes, including the regulation of the heart, these oscillations are being studied by a diverse group across the sciences. This book is the first introduction to nonlinear chemical dynamics written specifically for chemists. It covers oscillating reactions, chaos, and chemical pattern formation, and includes numerous practical suggestions on reactor design, data analysis, and computer simulations. Assuming only an undergraduate knowledge of chemistry, the book is an ideal starting point for research in the field. The book begins with a brief history of nonlinear chemical dynamics and a review of the basic mathematics and chemistry. The authors then provide an extensive overview of nonlinear dynamics, starting with the flow reactor and moving on to a detailed discussion of chemical oscillators. Throughout the authors emphasize the chemical mechanistic basis for self-organization. The overview is followed by a series of chapters on more advanced topics, including complex oscillations, biological systems, polymers, interactions between fields and waves, and Turing patterns. Underscoring the hands-on nature of the material, the book concludes with a series of classroom-tested demonstrations and experiments appropriate for an undergraduate laboratory.

Introduction—A Bit of History

1998 ◽  
Author(s):  
Irving R. Epstein ◽  
John A. Pojman
Keyword(s):  
Chemical Reactions ◽  
Theoretical Biology ◽  
Theoretical Work ◽  
Living System ◽  
Oscillatory Behavior ◽  
Chemical Dynamics ◽  
Oscillating Reactions ◽  
History Of ◽  
Satisfactory Answer ◽  
Nonlinear Chemical Dynamics

Oscillations of chemical origin have been present as long as life itself. Every living system contains scores, perhaps hundreds, of chemical oscillators. The systematic study of oscillating chemical reactions and of the broader field of nonlinear chemical dynamics is of considerably more recent origin, however. In this chapter, we present a brief and extremely idiosyncratic overview of some of the history of nonlinear chemical dynamics. In 1828, Fechner described an electrochemical cell that produced an oscillating current, this being the first published report of oscillations in a chemical system. Ostwald observed in 1899 that the rate of chromium dissolution in acid periodically increased and decreased. Because both systems were inhomogeneous, it was believed then, and through much of our own century, that homogeneous oscillating reactions were impossible. Degn wrote in 1972 (p. 302): “It is hard to think of any other question which already occupied chemists in the nineteenth century and still has not received a satisfactory answer.” In that same year, though, answers were coming. How it took so long for the nature of oscillating chemical reactions to be understood and how that understanding eventually came about will be the major focus of this chapter. Although oscillatory behavior can be seen in many chemical systems, we shall concentrate primarily on homogeneous, isothermal reactions in aqueous solution. In later chapters, we shall broaden our horizons a bit. While the study of oscillating reactions did not become well established until the mid-1970s, theoretical discussions go back to at least 1910. We consider here some of the early theoretical and experimental work that led up to the ideas of Prigogine on nonequilibrium thermodynamics and to the experimental and theoretical work of Belousov, Zhabotinsky, Field, Körös, and Noyes, all of whom did much to persuade chemists that chemical oscillations, traveling fronts, and other phenomena that now comprise the repertoire of nonlinear chemical dynamics were deserving of serious study. Alfred Lotka was one of the more interesting characters in the history of science. He wrote a handful of theoretical papers on chemical oscillation during the early decades of this century and authored a monograph (1925) on theoretical biology that is filled with insights that still seem fresh today.

The Modernities of H. Lawrence Freeman

2019 ◽  
Vol 72 (3) ◽  
pp. 719-779
Author(s):  
David Gutkin
Keyword(s):  
Nineteenth Century ◽  
New York ◽  
Reception History ◽  
Black Press ◽  
Late Nineteenth Century ◽  
Starting Point ◽  
History Of ◽  
Late Nineteenth ◽  
White Press ◽  
Grand Opera

H. Lawrence Freeman's “Negro Jazz Grand Opera,” Voodoo, was premiered in 1928 in Manhattan's Broadway district. Its reception bespoke competing, racially charged values that underpinned the idea of the “modern” in the 1920s. The white press critiqued the opera for its allegedly anxiety-ridden indebtedness to nineteenth-century European conventions, while the black press hailed it as the pathbreaking work of a “pioneer composer.” Taking the reception history of Voodoo as a starting point, this article shows how Freeman's lifelong project, the creation of what he would call “Negro Grand Opera,” mediated between disparate and sometimes apparently irreconcilable figurations of the modern that spanned the late nineteenth century through the interwar years: Wagnerism, uplift ideology, primitivism, and popular music (including, but not limited to, jazz). I focus on Freeman's inheritance of a worldview that could be called progressivist, evolutionist, or, to borrow a term from Wilson Moses, civilizationist. I then trace the complex relationship between this mode of imagining modernity and subsequent versions of modernism that Freeman engaged with during the first decades of the twentieth century. Through readings of Freeman's aesthetic manifestos and his stylistically syncretic musical corpus I show how ideas about race inflected the process by which the qualitatively modern slips out of joint with temporal modernity. The most substantial musical analysis examines leitmotivic transformations that play out across Freeman's jazz opera American Romance (1924–29): lions become subways; Mississippi becomes New York; and jazz, like modernity itself, keeps metamorphosing. A concluding section considers a broader set of questions concerning the historiography of modernism and modernity.

Towards an Archival Critique: Opening Possibilities for Addressing Neoliberalism in the Archival Field

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Marika Cifor ◽  
Jamie A. Lee
Keyword(s):  
Human Rights ◽  
Social Justice ◽  
Archival Studies ◽  
Ethical Practice ◽  
Political Practice ◽  
Starting Point ◽  
Hands On ◽  
Library And Information Studies ◽  
Information Studies ◽  
Contemporary Life

Neoliberalism, as economic doctrine, as political practice, and even as a "governing rationality" of contemporary life and work, has been encroaching on the library and information studies (LIS) field for decades. The shift towards a conscious grappling with social justice and human rights debates and concerns in archival studies scholarship and practice since the 1990s opens the possibility for addressing neoliberalism and its elusive presence. Despite its far-reaching influence, neoliberalism has yet to be substantively addressed in archival discourse. In this article, we propose a set of questions for archival practitioners and scholars to reflect on and consider through their own hands-on practices, research, and productions with records, records creators, and distinct archival communities in order to develop an ongoing archival critique. The goal of this critique is to move towards "an ethical practice of community, as an important mode of participation." This article marks a starting point for critically engaging the archival studies discipline along with the LIS field more broadly by interrogating the discursive and material evidences and implications of neoliberalism.

Presbyterians and Ethics

2019 ◽  
pp. 525-537
Author(s):  
Mark Douglas
Keyword(s):  
World War Ii ◽  
Great Awakening ◽  
Reformed Theology ◽  
Second Great Awakening ◽  
World War ◽  
Early Nineteenth Century ◽  
History Of Ethics ◽  
Presbyterian Church ◽  
Starting Point ◽  
History Of

The history of ethics in the Presbyterian Church has been shaped by the theological commitments of Reformed theology, the church’s ecumenical and interreligious encounters, its interactions with the wider cultures in which it functions, and its global scope. Consequently, Presbyterian ethics have become increasingly diverse, culturally diffused, ecumenically directed, and frequently divisive. That said, its history can helpfully be divided into three lengthy periods. In the first (roughly from the church’s origins in 1559 to the Second Great Awakening in the early nineteenth century), theology, ethics, and politics are so interwound that distinguishing one from the others is difficult. In the second (roughly from the Second Great Awakening to the end of World War II), moral concerns emerge as forces that drive the church’s theology and polity. And in the third (for which proclamation of the Universal Declaration of Human Rights in 1948 might be a heuristically helpful starting point), ethics increasingly functions in ways that are only loosely tethered to either Reformed theology or polity. The strength of the church’s social witness, the consistency of its global engagements, and the failings of its internecine strife are all evident during its five-hundred-year history.

scholarly journals 335 - BEHÇET DISEASE PRESENTING WITH ACUTE PSYCHOSIS

2020 ◽  
Vol 32 (S1) ◽  
pp. 94-94
Author(s):  
A.M. Carvalheiro ◽  
A.R. Fonseca ◽  
J. Maia
Keyword(s):  
Psychiatric Symptoms ◽  
Retinal Vasculitis ◽  
Posterior Uveitis ◽  
Neurological Involvement ◽  
Behçet Disease ◽  
Acute Psychosis ◽  
Behcet Disease ◽  
Persecutory Delusions ◽  
Starting Point ◽  
History Of

ObjectivesUsing as a starting point a clinical case, the authors performed a literature review to clarify the relationship between Behçet disease and acute psychosis.MethodsAnalysis of the patient's clinical process and brief review of the latest available literature on the subject, published in PubMed/Medline databases.ResultsMale patient, 55 years old, brought to the emergency room by fever, headache, hetero-aggressive behavior, disinhibited behavior, mood swings, euphoria, persecutory delusions and insomnia, in the last 4 days. He had no insight into his illness. There was no personal or family history of psychiatric illness and toxicological habits were irrelevant. Due to the personal history of posterior uveitis with bilateral macular edema, retinal vasculitis, genital aphthosis, papulo-vesicular lesions and recurrent bipolar aphthosis, the hypothesis of neuro-behçet was raised.ConclusionsBehçet's disease can present with neurological involvement - neuro -behçet - and can manifest itself with several psychiatric symptoms (euphoria, lack of insight, disinhibited behavior, agitation or psychomotor retardation, persecutory delusions, obsessive thoughts, anxiety, depression, insomnia or memory changes). Fever and headache usually appear in the prodromal stage and can be signs of onset or recurrence of the disease. The prevalence of neuro-behçet ranges from 2 to 50% and usually occurs 1 to 10 years after the first symptoms of the disease. Since it appears as the first manifestation of the disease in only 3% of cases, it is difficult to diagnose. The literature suggests that symptoms are generally resistant to treatment with conventional psychotropic drugs and so it is an important cause of morbidity and mortality.”

scholarly journals Population genomic and historical analysis suggests a global invasion by bridgehead processes in Mimulus guttatus

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Mario Vallejo-Marín ◽  
Jannice Friedman ◽  
Alex D. Twyford ◽  
Olivier Lepais ◽  
Stefanie M. Ickert-Bond ◽  
...  
Keyword(s):  
Biological Invasions ◽  
Historical Analysis ◽  
Historical Records ◽  
British Isles ◽  
Mimulus Guttatus ◽  
Introduced Populations ◽  
Genome Wide ◽  
Starting Point ◽  
History Of ◽  
Global Invasion

AbstractImperfect historical records and complex demographic histories present challenges for reconstructing the history of biological invasions. Here, we combine historical records, extensive worldwide and genome-wide sampling, and demographic analyses to investigate the global invasion of Mimulus guttatus from North America to Europe and the Southwest Pacific. By sampling 521 plants from 158 native and introduced populations genotyped at >44,000 loci, we determined that invasive M. guttatus was first likely introduced to the British Isles from the Aleutian Islands (Alaska), followed by admixture from multiple parts of the native range. We hypothesise that populations in the British Isles then served as a bridgehead for vanguard invasions worldwide. Our results emphasise the highly admixed nature of introduced M. guttatus and demonstrate the potential of introduced populations to serve as sources of secondary admixture, producing novel hybrids. Unravelling the history of biological invasions provides a starting point to understand how invasive populations adapt to novel environments.

scholarly journals A History of Fluid Management—From “One Size Fits All” to an Individualized Fluid Therapy in Burn Resuscitation

Medicina ◽  
2021 ◽  
Vol 57 (2) ◽  
pp. 187
Author(s):  
Dorothee Boehm ◽  
Henrik Menke
Keyword(s):  
Fluid Therapy ◽  
Point Of Care ◽  
Fluid Management ◽  
Point Of Care Ultrasound ◽  
Burn Patients ◽  
Starting Point ◽  
History Of ◽  
Definition Of ◽  
Historical Developments ◽  
Burn Resuscitation

Fluid management is a cornerstone in the treatment of burns and, thus, many different formulas were tested for their ability to match the fluid requirements for an adequate resuscitation. Thereof, the Parkland-Baxter formula, first introduced in 1968, is still widely used since then. Though using nearly the same formula to start off, the definition of normovolemia and how to determine the volume status of burn patients has changed dramatically over years. In first instance, the invention of the transpulmonary thermodilution (TTD) enabled an early goal directed fluid therapy with acceptable invasiveness. Furthermore, the introduction of point of care ultrasound (POCUS) has triggered more individualized schemes of fluid therapy. This article explores the historical developments in the field of burn resuscitation, presenting different options to determine the fluid requirements without missing the red flags for hyper- or hypovolemia. Furthermore, the increasing rate of co-morbidities in burn patients calls for a more sophisticated fluid management adjusting the fluid therapy to the actual necessities very closely. Therefore, formulas might be used as a starting point, but further fluid therapy should be adjusted to the actual need of every single patient. Taking the developments in the field of individualized therapies in intensive care in general into account, fluid management in burn resuscitation will also be individualized in the near future.

Kabuki Actors Study

2001 ◽  
Vol 16 (3) ◽  
pp. 94-98
Author(s):  
Marc Brodsky
Keyword(s):  
Health Care ◽  
Health Status ◽  
Medical Condition ◽  
Pain Severity ◽  
Health Issues ◽  
Medical Problems ◽  
Medical Practitioners ◽  
Starting Point ◽  
History Of

The Kabuki Actors Study set out to explore the health status of Kabuki actors, their performance-related medical problems, and the nature and extent of their health care. Two hundred sixteen Kabuki performers voluntarily completed an anonymous three-page survey addressing their health issues. Thirty-eight percent of the actors reported a history of at least one significant medical condition, and 88% of them identified at least one musculoskeletal or nonmusculoskeletal problem associated with performance. Sixty-nine percent of the performers had visited a physician over the preceding year, and 30% of them had consulted nonphysician medical practitioners. Kabuki actors, the Kabuki management, and physicians can use the findings of this study as a starting point to investigate why these injuries occur and how to prevent and treat them. Pain severity scales or other measurable outcomes of therapy can be used to compare the efficacies of physician and nonphysician treatments.

Persistent Tensions? International Legal Perspectives on ‘Other’ Foreign Fighters

2018 ◽  
Vol 60 (1) ◽  
pp. 539-573
Author(s):  
Marnie Lloydd
Keyword(s):  
Armed Conflict ◽  
Global Justice ◽  
Collective Good ◽  
Due Diligence ◽  
Strong Basis ◽  
Slowing Down ◽  
Sovereign Equality ◽  
Starting Point ◽  
History Of ◽  
Foreign Fighters

This paper takes as its starting point the question of whether and to what extent States may have an international legal obligation towards other States to seek to prevent those within their jurisdiction from travelling abroad to fight with a non-State armed group in a foreign armed conflict. While there is a strong basis for such due diligence obligations regarding the prevention of terrorist activity, including Security Council Resolution 2178 (2014) on ‘foreign terrorist fighters’, the scope of responsibility is less clear regarding broader categories of foreigners participating in civil war, despite a long history of foreign volunteers in armed conflict. In this paper, I present a reading of two possible resolutions in international law to the question posed by this ‘other’ foreign fighting and explore the tensions between them. The first is based on State responsibility, sovereign equality, and diligent prevention of harm; the second on a more contextual reading of human rights considerations and global justice. The tensions surrounding ‘other’ foreign fighters provide a practical example of the oscillation between a reliance on the consent of States and a notion of the collective good in international legal argument. Acknowledging the practical reliance of States on these interlacing perspectives in different times and contexts, I suggest the importance of stepping back and slowing down to look beyond today’s predominant but narrower and rushed, focus on counter-terrorism approaches to take account of the key themes that have shaped the legal discourse and practice regarding a broader historical range of foreign volunteering in armed conflict.

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