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PubMedDate not supplied

[The morphological validation for the clinical use of a nerve transplantation method].

The paper summarizes the results of long-term studies made by the Department of Morphology, Institute of Experimental Medicine, Russian Academy of Medical Sciences, and the data available in the literature on the problems of neurografting and histogenesis of nervous tissue in the human prenatal development. It presents data on the conditions that most favourably affect the acceptance and development of neurografts, the integration of their cell elements with the recipient's brain, and the correction of dysfunctions. Emphasis is laid on the choice of a donor's material, the modes of its treatment and insertion, on the determination of grafting sites and scope, on immunosuppression and postoperative drug provision.

Brain↗
PubMed1976

[Anatomo-histologic findings clarifying the phylogenetic relationships between salmonoid fish (Salmonoidei)].

The comparative anatomo-histological analysis of the medial gut of Osmeridae and Plecoglossidae after Iwai (1962) has revealed a great similarity in the structure of this entosomatic organ suggesting their phylogenetically close nature. On the contrary, the fine structure of the medial gut in these two families substantially differs from the structure of this organ in Salmonoidee. Pronounced distinctions were found between the structure of the medial gut of smelts and that of the pike (Esox lucius Linné). The complicatedly differentiated medial gut of the pike is so different from the primitive gut of modern smelts that the hypothesis (Starks, 1930; Berg, 1940) on the origin of Ecosoidei from ancient Osmeridae does not seem probable. The data obtained by the anatomo-histological analysis in combination with data of other sciences should be taken into consideration when creating the natural system of Salmonoidei, since they contribute to more exact character of their phylogenetic relations.

Animals↗
PubMed1978

Healthy family functioning: a cross-cultural appraisal.

It is increasingly recognized that rapid cultural, social, economic, and technological changes are imposing increasing stress on family structures, traditional values, and the ability to adapt to new environments in different societies. For the purposes of this paper, "healthy family functioning" is defined in terms of a family unit (however it is conceived in any given culture) effectively coping with cultural, environmental, psychosocial, and socioeconomic stresses throughout the family life cycle. While a review of international literature in the behavioural and biomedical sciences yields little data on comparative studies, there is growing awareness of the need for cooperative international research on family coping mechanisms and determinants of self-reliant communal coping behaviour, as well as more efficient utilization of already available knowledge. After consideration of methodological pitfalls of assessment procedures, there is a presentation of an evolving theory of healthy family functioning with the suggestion that studies of young married couples constitute a particularly promising vehicle for developing needed cooperative cross-cultural research.

Cross-Cultural Comparison↗
PubMed1988

General statistical design considerations of randomized clinical trials.

Randomized clinical trials are the most objective method for evaluating new therapies, but they are subject to the same biases as nonrandomized studies unless the principles of statistical design are observed at the planning stage. Estimation of sample size also requires early careful consideration, since studies of inadequate size will not have sufficient statistical power to detect meaningful treatment differences. For ethical reasons, interim data monitoring procedures should be used to detect early treatment responses that may lead to alteration or interruption of the planned study to give patients early benefit from a superior treatment or diminish their risk from ineffective or harmful treatment. Additional important aspects of clinical trial design that were not addressed in this report include: definition of study objectives and endpoints, description of data to be collected, details of the treatment regimens, informed consent and plans for data analysis. The science of clinical trial design is complex; only some of the key statistical issues have been addressed briefly in this report.

Clinical Trials as Topic↗
PubMed1982

Clinical studies of the endogenous opioid system.

The role of the endogenous opioid system in humans was studied using three clinical research strategies. High doses of the opiate antagonist naloxone (up to 4 mg/kg) were administered to normal volunteers. Dose-dependent increases in self-ratings of tension-anxiety and anger-hostility were observed, supporting the hypothesized involvement of the endogenous opioid system in the modulation of human mood and feelings of well-being. Accompanying dose-dependent increases in systolic blood pressure and respiratory rate were found, suggesting that the lower doses of naloxone utilized in previous clinical studies were not sufficient to block the endogenous opioid system. CSF opioid activity in psychiatric patients and normals was measured using a sensitive radioreceptor assay developed by the authors. Results suggest diminished endogenous opioid system activity in some schizophrenics, and a relationship between opioid activity and state change in manic-depressive illness and anorexia nervosa. A complex but consistently observed relationship between ratings of anxiety and CSF opioid activity in normals and patients is consistent with basic science and clinical data suggesting interactions between CNS noradrenergic and opioid systems. General surgery was used as a strategy for studying the relationship of the endogenous opioid system to stress in humans; robust increases in levels of plasma beta-endorphin immunoreactivity accompanying surgical stress and an inverse relationship between patient levels of plasma beta-endorphin immunoreactivity and postoperative analgesic requirement were observed. These data support the involvement of the endogenous opioid system in the human stress response and suggest that hormonal stress response and endogenous opioid system activity may relate to human endogenous analgesic mechanisms.

Adolescent↗
PubMedDate not supplied

[Correlations in the utilization of carbon sources in the range of griseus species of the genus Streptomyces].

The author proposes a new scheme for arranging the data about the assimilation of carbon sources in tables; this is illustrated with the Griseus species belonging to the Streptomyces genus and with the information about them presented by Bergey [2]. In the scheme, carbon sources in the tables are arranged in the order of their diminishing availability for streptomycetes, and the lists of species within the morphological groups are constructed according to the property of a carbon source not being assimilated. Such an arrangement of data in the tables is very clear and convenient to use; it allows one to make optimal schemes for determining the assimilation of carbon sources by actinomycetes, and makes it easy to divide any large number of cultures into groups according to a similar assimilation of carbon sources. The scheme has been used to analyse the data available in science and to establish correlations in the assimilation of carbon sources by species of the Griseus series belonging to the Streptomyces genus.

Carbon↗
PubMed1994

The social stratification of aging and health.

The way health varies with age is importantly stratified by socioeconomic status (SES)--specifically, education and income. Prior theory and cross-sectional data suggest that among higher SES persons the onset of health problems is usually postponed until rather late in life, while health declines are prevalent in lower SES groups by middle age. Thus, SES differences in health are small in early adulthood, but increase with age until relatively late in life, when they diminish due to selection or greater equalization of health risks and protections. The present paper strengthens our causal and interpretive understanding of these phenomena by showing: (1) that results previously reported for indices of SES hold separately for education and income; (2) that the interaction between age and SES (i.e., education or income) in predicting health can be substantially explained by the greater exposure of lower SES persons to a wide range of psychosocial risk factors to health, especially in middle and early old age, and, to a lesser degree, the greater impact of these risk factors on health with age; and (3) that results (1) and (2) generally hold in short-term longitudinal as well as in cross-sectional data. Implications for science and policy in the areas of aging, health, and social stratification are discussed.

Activities of Daily Living↗
PubMedDate not supplied

Learning contracts in clinical education.

This study explored the outcomes of using learning contracts in a radiologic science program. Telephone surveys of contract learning participants and other radiologic science graduates provided data regarding graduate career satisfaction, lifelong learning habits and attitudes toward learning. Statistical comparison data found that contract learning participants reported higher job satisfaction, participated more in continuing education, demonstrated more self-motivation and independence, felt less competitive and anxious about courses and grades and felt more involved in their clinical courses.

Humans↗
PubMed1996

Myocardial infarction: the first 24 hours.

Myocardial infarction is the most common cause of death in the United States. Rapid postinfarction intervention in the first 24 hours decreases mortality. Treatment modalities are rapidly evolving as new data from basic science research and clinical trials become available. Rapid thrombolysis, accurate criteria for diagnosis and administration of effective adjunctive therapy are crucial in preventing complications of myocardial infarction. Initial measures in the emergency department include intravenous access, accurate history and physical assessment, placement of oxygen, electrocardiography, use of aspirin and nitrates, and consideration of thrombolysis or angioplasty in appropriate candidates, optimally within one to two hours of myocardial infarction. After hospital admission, additional adjunctive treatment, including beta blockers, angiotensin-converting enzyme inhibitors and anticoagulation, can be instituted.

Arrhythmias, Cardiac↗
PubMed1998

[Genetic aspects of rheumatic diseases].

The paper presents the results of the long-term studies of the pattern of hereditary predisposition to rheumatism, rheumatoid arthritis (RA), ankylosing spondyloarthritis (AS), osteoarthrosis which have been conducted at the Institute of Rheumatology, Russian Academy of Medical Sciences. It gives data on the type of inheritance of these diseases, the affliction heritability ratio, the penetrance of three genotypes within the model of an autosomal one-allele locus (SAL-2) for rheumatism and RA. The contribution of additive and dominant components in the determination of rheumatism and RA, the results of tests of their genetic heterogeneity, associations with HLA antigens are assessed. The paper outlines the results of tests of the candidate genes COLIA2, TCRB, TCRD as major RA predisposition genes via analysis of adherence and DNA polymorphism.

DNA↗
PubMed1994

Guns in the medical literature--a failure of peer review.

Errors of fact, design, and interpretation abound in the medical literature on guns and violence. The peer review process has failed to prevent publication of the errors of politicized, results-oriented research. Most of the data on guns and violence are available in the criminologic, legal, and social sciences literature, yet such data escape acknowledgment or analysis of the medical literature. Lobbyists and other partisans continue to promulgate the fallacies that cloud the public debate and impede the development of effective strategies to reduce violence in our society. This article examines a representative sample of politicized and incompetent research.

Accidents↗
PubMed1996

Measuring science: an exploration.

This paper examines the available United States data on academic research and development (R&D) expenditures and the number of papers published and the number of citations to these papers as possible measures of "output" of this enterprise. We look at these numbers for science and engineering as a whole, for five selected major fields, and at the individual university field level. The published data in Science and Engineering Indicators imply sharply diminishing returns to academic R&D using published papers as an "output" measure. These data are quite problematic. Using a newer set of data on papers and citations, based on an "expanding" set of journals and the newly released Bureau of Economic Analysis R&D deflators, changes the picture drastically, eliminating the appearance of diminishing returns but raising the question of why the input prices of academic R&D are rising so much faster than either the gross domestic product deflator or the implicit R&D deflator in industry. A production function analysis of such data at the individual field level follows. It indicates significant diminishing returns to "own" R&D, with the R&D coefficients hovering around 0.5 for estimates with paper numbers as the dependent variable and around 0.6 if total citations are used as the dependent variable. When we substitute scientists and engineers in place of R&D as the right-hand side variables, the coefficient on papers rises from 0.5 to 0.8, and the coefficient on citations rises from 0.6 to 0.9, indicating systematic measurement problems with R&D as the sole input into the production of scientific output. But allowing for individual university field effects drives these numbers down significantly below unity. Because in the aggregate both paper numbers and citations are growing as fast or faster than R&D, this finding can be interpreted as leaving a major, yet unmeasured, role for the contribution of spillovers from other fields, other universities, and other countries.

Publishing↗
PubMed1983

Role of similarity principles in data extrapolation.

This paper addresses the problem of extrapolating from data set gathered on a particular system to problems of more general physiological interest. It asks: what are the limits of the extrapolability of data? Under what circumstances can data derived from a particular system be transformed into data about another, different system? Such questions address the general problem of similarity analysis. A mathematical exploration of the meaning and usefulness of the concept of similarity is presented, and the necessity for a "prototype" is introduced. The discussion shows what we mean by the relationship between natural systems and the purest form of model of such systems, the mathematical model. The value and limitations of Dimensional Analysis are considered. It is concluded that the principle of dimensional homogeneity which underlies Dimensional Analysis is not strong enough to cope effectively with situations involving many phases, as arise in biological studies. Therefore, a more general approach is used. It is shown that the problems associated with data extrapolation are very deep and lead to some of the deepest issues in all of science. The extrapolation of data from animal models to human beings has been a general characteristic of pharmacologic research and, for that matter, biomedical investigations generally. Attention to limitations and dangers of such extrapolations seems overdue. With proper understanding of the essential nature of the extrapolatory action, and modeling relations, models can be validated.

Animals↗
PubMed1986

Toxicities derived from anti-tumor screening data.

A recent study published by the National Academy of Sciences emphasized an acute shortage of data on the toxic effects of chemicals in man and animals. This shortage makes risk assessment difficult and impacts seriously on the development of a sound environmental policy. The National Cancer Institute, in its search for effective anti-cancer agents, has determined quantitative as well as qualitative toxicities for a large number of chemicals. Probit analysis was used to derive lethalities (LD50s) from data obtained in the process of testing anti-cancer agents in mice. These data were compared with those derived from testing those same agents in normal mice and it was found that a correlation exists between the two toxicities. Toxicities derived from NCI testing in normal animals were compared with published values and a similar correlation was found. LD50s were derived for all compounds tested in normal mice as well as those tested in mice bearing L1210 and P388 lymphocytic leukemias. Over 32,000 LD50s were derived for 22,597 unique compounds.

Animals↗
PubMed1991

Geobase: a simple geographical information system on a personal computer.

Spatially distributed data are often encountered in the biological sciences. Representation and analysis of such data requires specific tools. A simple geographical information system is presented, which allows representation and elementary analysis of geographically coded information. The system handles two kinds of data: maps and facts, where map data describe the basis on which the fact data are located. Maps consist of objects described through a set of coordinates, while for facts a coordinate pair is associated with an unlimited number of data records containing five fields: a date, an element from a list, a two-character code, an integer number and a real number. The input data can be displayed interactively on screen by logically combining selection criteria for each field. The facts corresponding to the selected criteria are either displayed as such, or are clustered and displayed as polygons or pies. A short example showing a possible application of the program is presented and advantages as well as limitations are discussed.

Algorithms↗
PubMed1997

The proper use of self-report questions in effective measurement of health outcomes.

Outcomes research often relies on the use of general population survey data. The recent efforts to employ cognitive science theory in the development of data collection instruments has led to the establishment of new questionnaire design research methods. Intensive cognitive techniques are used in laboratory interviews to develop and pretest self-report survey questions with the goal of reducing non-sampling response error. This article presents the theoretical and applied approach used in the cognitive laboratory to study the ways people respond to surveys, and offers guidelines for improving self-report survey questions.

Cognition↗