THE STRUCTURE AND FUNCTION OF RENAL GLOMERULAR CAPILLARIES IN HEALTH AND DISEASE

PEDIATRICS ◽  
1963 ◽  
Vol 32 (4) ◽  
pp. 480-496
Author(s):  
Robert L. Vernier
Keyword(s):  
The United States ◽  
Renal Diseases ◽  
The Past ◽  
Transient Nature ◽  
Inadequate Knowledge ◽  
Health And Disease ◽  
And Function ◽  
Chronic Sequelae ◽  
Sequential Studies ◽  
Glomerular Capillaries

In the belief that sequential studies of the pathology of the kidney might improve our understanding of the pathogenesis of a variety of forms of renal disease in childhood, we began to perform percutaneous renal biopsies in children in 1955. Our studies were stimulated by the pioneering investigations of Iversen and Brun1 in Europe, and Muehrcke, Kark, and Pirani2 in the United States. Our experience3 now includes more than 500 kidney biopsy specimens obtained from approximately 400 children of all ages. The incidence of complications has been low, and the method has proved to be safe enough to justify the small risk entailed. Bleeding into the perirenal tissues, sufficient to cause pain, or a measurable fall in hemoglobin, or the appearance of a mass, has occurred in eight children. Gross hematuria of more than transient nature has occurred in six additional children. There has been no recognized permanent renal functional impairment or other chronic sequelae of these accidents. Surgical exploration of the biopsied kidney has never been necessary and no deaths have occurred as a consequence of the procedure. The confusion which exists regarding classification and diagnosis of many renal diseases arises because of inadequate knowledge of their etiology, and is further compounded by conflicting use of terminology by clinicians and pathologists. The terms nephritis, nephrosis, mixed nephritis-nephrosis, and the modifying terms acute, subacute, and chronic, are, for example, applied by these two groups of physicians in circumstances which differ widely depending upon the experience of the user. Widespread use of the renal biopsy technique over the past 7 years has not eliminated the difficulties in use of terminology, but some progress has been made.

Joint programmes in paediatric cardiothoracic surgery: a survey and descriptive analysis

2011 ◽  
Vol 21 (S2) ◽  
pp. 159-164 ◽  
Author(s):  
William M. DeCampli
Keyword(s):  
Online Survey ◽  
Descriptive Analysis ◽  
The United States ◽  
The Past ◽  
Perceived Success ◽  
Primary Hospital ◽  
Primary Institutions ◽  
Cardiac Surgeons ◽  
And Function

AbstractBackgroundJoint programmes, as opposed to regionalisation of paediatric cardiac care, may improve outcomes while preserving accessibility. We determined the prevalence and nature of joint programmes.MethodsWe sent an online survey to 125 paediatric cardiac surgeons in the United States in November, 2009 querying the past or present existence of a joint programme, its mission, structure, function, and perceived success.ResultsA total of 65 surgeon responses from 65 institutions met the criteria for inclusion. Of the 65 institutions, 22 currently or previously conducted a joint programme. Compared with primary institutions, partner institutions were less often children's hospitals (p = 0.0004), had fewer paediatric beds (p = 0.005), and performed fewer cardiac cases (p = 0.03). Approximately 47% of partner hospitals performed fewer than 50 cases per year. The median distance range between hospitals was 41–60 miles, ranging from 5 to 1000 miles. Approximately 54% of partner hospitals had no surgeon working primarily on-site, and 31% of the programmes conducted joint conferences. Approximately 67% of the programmes limited the complexity of cases at the partner hospital, and 83% of the programmes had formal contracts between hospitals. Of the six programmes whose main mission was to increase referrals to the primary hospital, three were felt to have failed. Of the nine programmes whose mission was to increase regional quality, eight were felt to be successful.ConclusionJoint programmes in paediatric cardiac surgery are common but are heterogeneous in structure and function. Programmes whose mission is to improve the quality of regional care seem more likely to succeed. Joint programmes may be a practical alternative to regionalisation to achieve better outcomes.

scholarly journals Meiotic regulation of the Ndc80 complex composition and function

2021 ◽  
Author(s):  
Jingxun Chen ◽  
Elçin Ünal
Keyword(s):  
Chromosome Segregation ◽  
Budding Yeast ◽  
Complex Composition ◽  
The Past ◽  
Ndc80 Complex ◽  
Health And Disease ◽  
Yeast Meiosis ◽  
And Function ◽  
Protein Synthesis And Degradation ◽  
Synthesis And Degradation

AbstractThis review describes the current models for how the subunit abundance of the Ndc80 complex, a key kinetochore component, is regulated in budding yeast and metazoan meiosis. The past decades of kinetochore research have established the Ndc80 complex to be a key microtubule interactor and a central hub for regulating chromosome segregation. Recent studies further demonstrate that Ndc80 is the limiting kinetochore subunit that dictates the timing of kinetochore activation in budding yeast meiosis. Here, we discuss the molecular circuits that regulate Ndc80 protein synthesis and degradation in budding yeast meiosis and compare the findings with those from metazoans. We envision the regulatory principles discovered in budding yeast to be conserved in metazoans, thereby providing guidance into future investigations on kinetochore regulation in human health and disease.

Take Another Little Piece of My Heart: Regulating the Research Use of Human Biospecimens

2013 ◽  
Vol 41 (2) ◽  
pp. 424-439 ◽  
Author(s):  
Gail H. Javitt
Keyword(s):  
United States ◽  
Genetic Variation ◽  
Personalized Medicine ◽  
Medical Research ◽  
Human Health ◽  
The United States ◽  
Research Use ◽  
The Past ◽  
Health And Disease

Access to human biospecimens is widely regarded as essential to the progress of medical research, and in particular, to the success of “personalized medicine.” Understanding the influence of genetic variation on human health and disease requires that researchers conduct genetic and other studies on thousands of human specimens. Over the past decade, human “biobanks” — vast collections of human biospecimens — have proliferated both in the United States and internationally. These biobanks are subject to a heterogeneous mix of standards that govern the collection and use of biospecimens.

scholarly journals Genetic basis of congenital platelet disorders

Hematology ◽  
2014 ◽  
Vol 2014 (1) ◽  
pp. 337-342 ◽  
Author(s):  
Jesse Hinckley ◽  
Jorge Di Paola
Keyword(s):  
Genetic Basis ◽  
Clinical Medicine ◽  
Short Review ◽  
Molecular Architecture ◽  
The Past ◽  
Platelet Disorder ◽  
Recent Developments ◽  
Health And Disease ◽  
Platelet Disorders ◽  
And Function

Abstract Over the past 4 decades, a better understanding of the genetic origins of inherited platelet disorders has illuminated avenues of investigation in megakaryopoiesis and has identified targets of pharmacologic intervention. Many of these discoveries have been translated into clinical medicine. The success of inherited platelet disorder research is underpinned by broader advances in methodology through the biochemical and molecular revolution of the 20th and 21st centuries, respectively. Recently, modern genomics techniques have affected platelet and platelet disorders research, allowing for the discovery of several genes involved in platelet production and function and for a deeper understanding of the RNA and miRNA networks that govern platelet function. In this short review, we focus on recent developments in the genetic elucidation of several disorders of platelet number and in the molecular architecture that determines the “genetic makeup” of a platelet in health and disease.

Osseointegration interface of calcified bone and endosseous implants

1992 ◽  
Vol 50 (2) ◽  
pp. 1096-1097
Author(s):  
K.E. Krizan ◽  
J.E. Laffoon ◽  
M.J. Buckley
Keyword(s):  
Structure And Function ◽  
Titanium Implants ◽  
En Bloc ◽  
Endosseous Implants ◽  
Ultrastructural Studies ◽  
The Past ◽  
Cacodylate Buffer ◽  
One Year ◽  
And Function

With increase use of tissue-integrated prostheses in recent years it is a goal to understand what is happening at the interface between haversion bone and bulk metal. This study uses electron microscopy (EM) techniques to establish parameters for osseointegration (structure and function between bone and nonload-carrying implants) in an animal model. In the past the interface has been evaluated extensively with light microscopy methods. Today researchers are using the EM for ultrastructural studies of the bone tissue and implant responses to an in vivo environment. Under general anesthesia nine adult mongrel dogs received three Brånemark (Nobelpharma) 3.75 × 7 mm titanium implants surgical placed in their left zygomatic arch. After a one year healing period the animals were injected with a routine bone marker (oxytetracycline), euthanized and perfused via aortic cannulation with 3% glutaraldehyde in 0.1M cacodylate buffer pH 7.2. Implants were retrieved en bloc, harvest radiographs made (Fig. 1), and routinely embedded in plastic. Tissue and implants were cut into 300 micron thick wafers, longitudinally to the implant with an Isomet saw and diamond wafering blade [Beuhler] until the center of the implant was reached.

International Research and Variation in Views of Ethnicity

2012 ◽  
Vol 2 (2) ◽  
pp. 66-72
Author(s):  
Ella Inglebret ◽  
Amy Skinder-Meredith ◽  
Shana Bailey ◽  
Carla Jones ◽  
Ashley France
Keyword(s):  
United States ◽  
Classification System ◽  
International Research ◽  
The United States ◽  
Research Articles ◽  
Journal Articles ◽  
Research Participants ◽  
The Past ◽  
International Scale ◽  
Publication Patterns

The authors in this article first identify the extent to which research articles published in three American Speech-Language-Hearing Association (ASHA) journals included participants, age birth to 18 years, from international backgrounds (i.e., residence outside of the United States), and go on to describe associated publication patterns over the past 12 years. These patterns then provide a context for examining variation in the conceptualization of ethnicity on an international scale. Further, the authors examine terminology and categories used by 11 countries where research participants resided. Each country uses a unique classification system. Thus, it can be expected that descriptions of the ethnic characteristics of international participants involved in research published in ASHA journal articles will widely vary.

The Laryngeal Epithelium in Reflux

2011 ◽  
Vol 21 (3) ◽  
pp. 112-117 ◽  
Author(s):  
Elizabeth Erickson-Levendoski ◽  
Mahalakshmi Sivasankar
Keyword(s):  
Laryngopharyngeal Reflux ◽  
Critical Role ◽  
Structure And Function ◽  
Laryngeal Disease ◽  
Health And Disease ◽  
And Function ◽  
The Impact

The epithelium plays a critical role in the maintenance of laryngeal health. This is evident in that laryngeal disease may result when the integrity of the epithelium is compromised by insults such as laryngopharyngeal reflux. In this article, we will review the structure and function of the laryngeal epithelium and summarize the impact of laryngopharyngeal reflux on the epithelium. Research investigating the ramifications of reflux on the epithelium has improved our understanding of laryngeal disease associated with laryngopharyngeal reflux. It further highlights the need for continued research on the laryngeal epithelium in health and disease.

Proportion of Individuals With Past-Year Suicidal Ideation Who Attempted Suicide Over the Past 10 Years in the United States, and the Influence of Age and Sex

Crisis ◽  
2020 ◽  
pp. 1-5
Author(s):  
Shannon Lange ◽  
Courtney Bagge ◽  
Charlotte Probst ◽  
Jürgen Rehm
Keyword(s):  
United States ◽  
Suicidal Ideation ◽  
Random Effects ◽  
Attempted Suicide ◽  
Suicide Attempts ◽  
The United States ◽  
Individual Level ◽  
The Past ◽  
Meta Analyses ◽  
Age Category

Abstract. Background: In recent years, the rate of death by suicide has been increasing disproportionately among females and young adults in the United States. Presumably this trend has been mirrored by the proportion of individuals with suicidal ideation who attempted suicide. Aim: We aimed to investigate whether the proportion of individuals in the United States with suicidal ideation who attempted suicide differed by age and/or sex, and whether this proportion has increased over time. Method: Individual-level data from the National Survey on Drug Use and Health (NSDUH), 2008–2017, were used to estimate the year-, age category-, and sex-specific proportion of individuals with past-year suicidal ideation who attempted suicide. We then determined whether this proportion differed by age category, sex, and across years using random-effects meta-regression. Overall, age category- and sex-specific proportions across survey years were estimated using random-effects meta-analyses. Results: Although the proportion was found to be significantly higher among females and those aged 18–25 years, it had not significantly increased over the past 10 years. Limitations: Data were self-reported and restricted to past-year suicidal ideation and suicide attempts. Conclusion: The increase in the death by suicide rate in the United States over the past 10 years was not mirrored by the proportion of individuals with past-year suicidal ideation who attempted suicide during this period.

EDITORIAL: Migration and competitiveness: Japan and the United States

2013 ◽  
Vol 10 (2) ◽  
pp. 115-124
Author(s):  
Philip L. Martin
Keyword(s):  
United States ◽  
The United States ◽  
Variable Cost ◽  
Fixed Cost ◽  
Special Issue ◽  
Science And Engineering ◽  
The Past ◽  
Past Half Century ◽  
Key Sectors ◽  
Past Half

Japan and the United States, the world’s largest economies for most of the past half century, have very different immigration policies. Japan is the G7 economy most closed to immigrants, while the United States is the large economy most open to immigrants. Both Japan and the United States are debating how immigrants are and can con-tribute to the competitiveness of their economies in the 21st centuries. The papers in this special issue review the employment of and impacts of immigrants in some of the key sectors of the Japanese and US economies, including agriculture, health care, science and engineering, and construction and manufacturing. For example, in Japanese agriculture migrant trainees are a fixed cost to farmers during the three years they are in Japan, while US farmers who hire mostly unauthorized migrants hire and lay off workers as needed, making labour a variable cost.

Democratic Legitimacy

2011 ◽  
Author(s):  
Pierre Rosanvallon
Keyword(s):  
United States ◽  
The United States ◽  
Democratic Legitimacy ◽  
Political Leaders ◽  
Constitutional Courts ◽  
International Debate ◽  
The Past ◽  
Democratic Authority ◽  
Original Contribution ◽  
Western Democracies

It's a commonplace occurrence that citizens in Western democracies are disaffected with their political leaders and traditional democratic institutions. But this book argues that this crisis of confidence is partly a crisis of understanding. The book makes the case that the sources of democratic legitimacy have shifted and multiplied over the past thirty years and that we need to comprehend and make better use of these new sources of legitimacy in order to strengthen our political self-belief and commitment to democracy. Drawing on examples from France and the United States, the book notes that there has been a major expansion of independent commissions, NGOs, regulatory authorities, and watchdogs in recent decades. At the same time, constitutional courts have become more willing and able to challenge legislatures. These institutional developments, which serve the democratic values of impartiality and reflexivity, have been accompanied by a new attentiveness to what the book calls the value of proximity, as governing structures have sought to find new spaces for minorities, the particular, and the local. To improve our democracies, we need to use these new sources of legitimacy more effectively and we need to incorporate them into our accounts of democratic government. This book is an original contribution to the vigorous international debate about democratic authority and legitimacy.

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