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Reliable multicast for the Grid: a case study in experimental computer science.

In its simplest form, multicast communication is the process of sending data packets from a source to multiple destinations in the same logical multicast group. IP multicast allows the efficient transport of data through wide-area networks, and its potentially great value for the Grid has been highlighted recently by a number of research groups. In this paper, we focus on the use of IP multicast in Grid applications, which require high-throughput reliable multicast. These include Grid-enabled computational steering and collaborative visualization applications, and wide-area distributed computing. We describe the results of our extensive evaluation studies of state-of-the-art reliable-multicast protocols, which were performed on the UK's high-speed academic networks. Based on these studies, we examine the ability of current reliable multicast technology to meet the Grid's requirements and discuss future directions.

Computer Simulation↗

Borderline personality disorder. Overview of biologic factors.

Exploring the biology of neurotransmitters and polymorphic genes that influence behavior most certainly will increase understanding of the complexity of personality disorders and the people who suffer with them. Continuing biologic exploration of the personality disorders will also provide new and valuable information that will inform and direct ever more sophisticated and specific psychiatric treatments. Further, it will supply knowledge that might begin to erode the strong biases and negative labels that have for too long been applied to these patients. These labels may have been applied not because these patients are bad people, but because of ignorance in understanding their complexity and limited ability to improve their condition. Nonetheless, clinicians must refrain from concluding that the answers to all problems in psychiatric treatment can be answered by the molecular geneticist or biologic researcher. As Reiss et al have written when speaking about nonshared environmental effects and its role in the development of psychopathology: "Psychiatry has been forced into the chronically uncomfortable position of straddling biomedicine and the social sciences and seems always to hunger for relief.... [Yet] the data simply do not permit a conception of the future centered on a straightforward biomedical answer to the fundamental question of the pathogenesis of major disorders. Indeed, a balanced image of the future contains a growing and equal partnership of the social sciences and molecular biology."

Borderline Personality Disorder↗

Radiologic sciences. Faculty needs assessment.

A total of 326 programs are represented in the data collected. Based on the average number of full- and part-time faculty members reported per program, this survey represents more than 1500 faculty positions. Based on the forecast of retirement and career change for all faculty members, there will be a turnover of 700 to 800 positions over the next 5 to 10 years. Part-time/adjunct faculty vacancies are expected to create the greatest number of opportunities for technologists to make the transition to education, with approximately one third of current part-time/adjunct educators planning on leaving radiologic sciences education within 5 years. To encourage retention of part-time/adjunct educators, annual evaluations should be modified to recognize the important educational role these instructors play. There is a need to create enthusiasm and interest in education as a career pathway for radiologic technologists. Resources are needed that help radiologic technologists make the transition to teaching. Finally, the retention of educators must be emphasized. Program applicant trends indicate radiologic technology students are older, have prior postsecondary education experience or are making a career change. This data emphasizes the need for educators, both full time and part time, to understand the characteristics and needs of the adult learner. Adult learners bring a wealth of education, experience and life skills that create both opportunities and challenges in the classroom and clinical setting. All categories of respondents indicated that their current salaries were greater than those of program graduates in their firstjob. Of interest is that 1 in 5 (20%) of part-time/adjunct educators indicated the opposite--that program graduates earn more in their firstjob than educators earn. When asked about salaries if working full time in clinical practice, the majority of all groups indicated their salary would be about the same or would decrease. Only 20% of program directors, 21% of full-time educators and 26% of part-time/adjunct educators indicated their salary would be higher in clinical practice. Part-time/adjunct educators reported working the most in clinical practice within the past week to month. Program directors exhibited the greatest separation from clinical practice, with more than half indicating a gap of 2 years or more from practicing in the clinical environment. While academic achievement is common among the educator populations sampled, a very low percentage of these educators are seeking an advanced academic degree. Less than a third of those surveyed indicated that they were pursuing an advanced degree. Becoming involved in research is not a requirement for many current educators, although survey participants expressed an interest in information about how to conduct a research project. A primary motivator for conducting the faculty development needs assessment was to use the data in strategic planning to set priorities for the resources available to the ASRT Education Department. The data will help maximize ASRT support for present and future educators. Services created by the ASRT Education Department will deepen the relationship with this key segment of the professional community.

Adult↗

Augmented reality in surgery.

OBJECTIVE: To evaluate the history and current knowledge of computer-augmented reality in the field of surgery and its potential goals in education, surgeon training, and patient treatment. DATA SOURCES: National Library of Medicine's database and additional library searches. STUDY SELECTION: Only articles suited to surgical sciences with a well-defined aim of study, methodology, and precise description of outcome were included. DATA SYNTHESIS: Augmented reality is an effective tool in executing surgical procedures requiring low-performance surgical dexterity; it remains a science determined mainly by stereotactic registration and ergonomics. Strong evidence was found that it is an effective teaching tool for training residents. Weaker evidence was found to suggest a significant influence on surgical outcome, both morbidity and mortality. No evidence of cost-effectiveness was found. CONCLUSIONS: Augmented reality is a new approach in executing detailed surgical operations. Although its application is in a preliminary stage, further research is needed to evaluate its long-term clinical impact on patients, surgeons, and hospital administrators. Its widespread use and the universal transfer of such technology remains limited until there is a better understanding of registration and ergonomics.

Forecasting↗

Systematic review of the effects of pertussis vaccines in children.

OBJECTIVE: To assess the efficacy and safety of whole-cell and acellular pertussis vaccines administered to children singly or within diphtheria, tetanus and pertussis (DTP) vaccines. DATA SOURCES: We searched the Cochrane Library, MEDLINE, EMBASE, Biological Abstracts and Science Citation Index to December 2001. Specialised websites and bibliographies of retrieved articles and reviews were assessed. Vaccine manufacturers and investigators were contacted for additional data. REVIEW METHODS: We included randomised and cohort studies comparing efficacy and/or safety of pertussis vaccines with placebo, DT, no intervention or each other. RESULTS: We included 52 studies (49 randomised controlled trials (RCTs), 3 cohort studies). All tested whole-cell and acellular vaccines were significantly more effective than placebo against pertussis. Absolute efficacy of whole-cell DTP varied from 37 to 92%. One- and two-component acellular vaccines had lower absolute efficacy (67-70%), than vaccines with >/=3 components (80-84%). Whole-cell vaccines were associated with significantly higher incidences of swelling and induration (odds ratio (OR) 11.67, 95% confidence interval (CI) 8.83-15.44), fever (OR for fever >39 degrees C 3.36, 95% CI 2.06-5.49) and crying for >2h (OR 4.72, 95% CI 2.94-7.59) than placebo or DT. Differences in incidence of hypotonic hyporesponsive episodes (HHE) and convulsions were not statistically significant. Acellular pertussis vaccines did not cause a higher incidence of local signs, fever, convulsions, HHE or prolonged crying than placebo or DT. CONCLUSION: All tested pertussis vaccines were efficacious. Whole-cell vaccines show variable efficacy, making interpretation of direct comparisons unreliable. Acellular vaccines with >/=3 antigenic components showed higher efficacy than one- and two-component vaccines. The adverse event profile of acellular vaccines was similar to that of placebo and considerably better than that of whole-cell vaccines.

Child↗

Phosphodiesterase inhibitors in Raynaud's phenomenon.

OBJECTIVE: To evaluate the efficacy of the phosphodiesterase type 5 (PDE5) inhibitors in the treatment of Raynaud's phenomenon. DATA SOURCES: Searches of MEDLINE (1966-March 2006) and Web of Science (1980-March 2006) were conducted; search terms were sildenafil, tadalafil, vardenafil, phosphodiesterase, and Raynaud. Studies and case reports published in English were retrieved. Additional references were identified in bibliographic reviews. DATA SYNTHESIS: Several small studies and a number of case reports have described the use of PDE5 inhibitors in patients with either primary or secondary Raynaud's phenomenon. The data from the best designed study show a reduced attack frequency and duration, reduced Raynaud Condition Score, and increased capillary blood flow in patients with secondary Raynaud's phenomenon. CONCLUSIONS: Available evidence suggests that sildenafil may be associated with improved microcirculation, symptomatic relief, and ulcer healing in patients with secondary Raynaud's phenomenon. Limited information suggests similar effects with tadalafil and vardenafil. Improved blood flow and clinical improvements have also been observed in some patients with primary Raynaud's phenomenon treated with PDE5 inhibitors; however, studies have yielded conflicting results.

3',5'-Cyclic-GMP Phosphodiesterases↗

Contributions of behavioral primatology to veterinary science and comparative medicine.

Behavioral primatology is a subdiscipline of the research area referred to as primatology. Like primatology, behavioral primatology is an eclectic field of study made up of researchers from diverse basic disciplines having very different historical roots and employing extremely different methodologies biased by emphases and assumptions dictated by their histories. Psychologists, zoologists, anthropologists, and psychiatrists make up the majority of those currently active in behavioral primatology, but others, including those in veterinary science, are active in research in the area. Behavioral data can be useful to veterinary scientists and to those in comparative medicine and are interesting in their own right. Veterinarians and medical scientists may specialize in behavioral disorders. In addition, those not directly interested in behavior itself may still make use of behavioral indices of potential physiologic and morphologic abnormality. Often an animal may be inadvertently stressed by social and nonsocial environmental factors, and such stress effects may be first and best recognized by behavioral means. A recognition by those not in the behavioral sciences of the basic feral behavior of primates can go a long way toward prevention or alleviation of both behavioral and physical stress of primates in captivity. Studies of free-ranging but captive troops are sources of information almost as good as, and sometimes even better than, field studies. In addition, there is a growing realization that "natural experiments" on primates in zoos can be of value, especially since many species held in zoologic parks are those least well known in more traditional captive research settings. It must be recognized that the findings from research done on captive primates living in large field cages are not directly comparable to those derived from more directly invasive but more experimental laboratory settings. A comparative perspective on captive environments, as well as on species, is strongly recommended. Behavioral primatologists, and particularly psychologists, have long been interested in behavioral development in various species of primates. A recognition of the importance of the effects of early experience, of species differences in development, of sex differences in development, of differences in species-specific social structures and in the relative plasticity of these, and of differences in symptoms of behavioral abnormality can contribute to the arsenal of techniques that might be used to improve the well-being of the primates and can help in the selection of appropriate animal models of disorder in humans for those in comparative medicine.(ABSTRACT TRUNCATED AT 400 WORDS)

Aggression↗

Questions for meta-analysis.

In spite of an abundance of data, the empirical evidence as yet does not make clear whether meta-analysis will bring about progress in psychological science. Therefore, it is still useful and desirable to engage in rational analysis of the methodology. Such analysis is done in the present essay by posing five questions that go to the logical and conceptual foundation of meta-analysis. The questions are (a) What are the grounds for believing that the review of the literature, even a quantitative one, will bring about scientific discovery? (b) Why is the individual study devalued when the history of successful science seems largely the story of the success of the individual study? (c) What is the rationale for believing that data analysis by itself can markedly improve the fortunes of psychological science? (d) Is there a basis for claims made on behalf of meta-analysis that it is more accurate than either the traditional literature review or the individual study? (e) Is there justification for the claim that de facto meta-analysis has been used effectively in physical science?

Humans↗

A pooled data analysis of injury incidence in rugby league football.

OBJECTIVE: The aim of this study was to summarise the injury rates in professional rugby league football. METHODS: Previously published studies were identified from database searches of the literature from Medline, Sports Discus and Web of Science. A total of 18 articles, which reported the prospective injury data collection for at least one playing season in professional rugby league worldwide, were included. The definition of injury adopted required an injured player to miss the subsequent game through injury. Ten studies satisfied the injury definition criteria for inclusion. A review of articles and extraction of relevant data were carried out independently by two authors. RESULTS: A total of 517 injuries were reported during 12819 hours of exposure (753 games), which resulted in an overall injury rate of 40.3 injuries per 1000 hours [95% confidence interval (CI) 36.9 to 43.8]. Most injuries were to the lower half of the body (20.7 per 1000 hours, 95% CI 17.7 to 24), with the trunk receiving the least (6.7 per 1000 hours, 95% CI 5 to 8.6). CONCLUSIONS: Injury rates in professional rugby league are higher than in some other contact sports, probably because of the large number of physical collisions that take place. This pooled data analysis provides more accurate estimates of injury incidence in the game of professional rugby league football.

Athletic Injuries↗

High-dose therapy for breast cancer.

In recent years, the most frequent indication for high-dose autologous stem-cell-supported chemotherapy in the United States has been breast cancer. This approach is applied in "high-risk," early-stage disease as adjuvant treatment, and with either curative or palliative intent in metastatic disease. Among both lay persons and medical professionals, high-dose therapy is broadly viewed as standard and appropriate, even though the results of the largest prospective randomized studies are not yet available. This view is based on extrapolation from preclinical data, a fundamental belief that "more is better," a faith in high technology, and the results of numerous pilot and phase I and II trials. Because high-dose therapy is promising, but also more difficult to administer than standard therapy, controversy rages in all circles concerning its use. Unless and until we have the results of properly randomized, prospective studies, this controversy will likely continue. Against this background, we will review the theoretical basis for high-dose treatment in breast cancer, the translation of this laboratory science into the clinic, usual treatment approaches, the available data, ongoing clinical trials, and future research directions.

Antineoplastic Agents↗

Evaluation of lidocaine and tetracaine mixture in axillary brachial plexus block.

The mixture of 1% lidocaine and 0.2% tetracaine with 1:200,000 epinephrine, so-called "supercaine," has been used extensively for axillary brachial plexus blockade for several decades. Since the advent of bupivacaine, the supercaine mixture has fallen into relative disuse despite its record of effectiveness and safety. No studies have been done recently to evaluate quality of anesthesia, duration of postoperative analgesia, and degree of patient satisfaction with this mixture when used for axillary brachial plexus blockade. The assumptions were as follows: surgical anesthesia will be adequate, length of postoperative analgesia will be approximately 4 to 9 hours, and patients will be highly satisfied. The specific aim of the present study was to describe the anesthetic characteristics of supercaine. Patients between 18 and 65 years of age received a standard mixture of supercaine, totaling 450-500 mg of lidocaine and 90 to 100 mg of tetracaine. Epinephrine in a solution of 1:200,000 and an 8.4% solution of sodium bicarbonate were added, and the transarterial technique was used. Patients were contacted on postoperative day 1 to determine the duration of sensory and motor block; overall satisfaction with the block was rated. Data were analyzed with the Statistical Program for the Social Sciences (SPSS, Chicago, Ill) and Stata (Stata Corp., College Station, Tex) computer programs. The mean +/- SD findings were as follows: duration of sensory block, 465 +/- 204 minutes; duration of motor block, 473 +/- 214 minutes; patient satisfaction score, 9 +/- 1 on a 1 to 10 scale. Data are reported within a 95% confidence interval. Variables examined and compared were not statistically significant. We concluded that the duration of block supports findings reported in the literature, patients equate duration of sensory block with duration of motor block, differences in duration were probably due to levels of provider experience, and patients were extremely satisfied with the anesthetic.

Adolescent↗

Towards a strategy of universally efficacious vaccination against pathogens uniquely susceptible to cell-mediated attack.

Infection by some intracellular parasites is contained only by cell-mediated immunity, and yet antibody is produced at the expense of the cell-mediated response upon natural infection, leading to chronic or fatal disease. Effective vaccination must therefore generate an immunological imprint ensuring a strong and stable cell-mediated response upon infection. Such diseases include leprosy, tuberculosis, the leishmaniasis and AIDS (Kaplan and Cohn (1986) Int. Rev. Exp. Pathol. 28, 45-78; Surcel et al. (1994) Immunology 81, 171-176; Pearson et al. (1983) Rev. Infect. Dis. 5, 907-927; Clerici and Shearer (1993) Immunol. Today 14, 107-111). BALB/C mice are susceptible to Leishmania major, a protozoan that causes cutaneous leishmaniasis in man, by the criterion that substantial infection results in antibody production and progressive disease (Locksley and Scott (1991) Immunoparasitology Today, A58-A61; J.N. Menon and P.A. Bretscher, unpublished data). Infection of BALB/C mice with very few parasites results in an exclusive cell-mediated, Th1-like response and resistance to an ordinarily pathogenic, high dose challenge. This resistance is associated with a strong and stable cell-mediated response (Bretscher et al. (1992) Science 257, 539-542; J.N. Menon and P.A. Bretscher, unpublished data). The generation of this Th1 imprint by low dose infection has been achieved with three very different strains of the parasite. There is a similar dependency of susceptibility and resistance on relative parasite dose in 'susceptible' and 'resistant' mice and in mice of 'intermediate susceptibility'. For example, 'resistant' mice are resistant to substantial infection but succumb to infection with very high doses of parasites. We therefore propose that infection of a genetically diverse population with a very low dose of viable parasites, that does not induce antibody in any individual, will either induce cell-mediated immunity and contain the parasite, or the parasite will grow until it reaches the threshold required to induce cell-mediated immunity, thereby generating the required imprint. Low dose infection may thus constitute universally efficacious vaccination. The pertinence of these observations to improving the efficacy of BCG vaccination against tuberculosis is discussed.

Acquired Immunodeficiency Syndrome↗

Gene expression databases and data mining.

The DNA microarray technology has arguably caught the attention of the worldwide life science community and is now systematically supporting major discoveries in many fields of study. The majority of the initial technical challenges of conducting experiments are being resolved, only to be replaced with new informatics hurdles, including statistical analysis, data visualization, interpretation, and storage. Two systems of databases, one containing expression data and one containing annotation data are quickly becoming essential knowledge repositories of the research community. This present paper surveys several databases, which are considered "pillars" of research and important nodes in the network. This paper focuses on a generalized workflow scheme typical for microarray experiments using two examples related to cancer research. The workflow is used to reference appropriate databases and tools for each step in the process of array experimentation. Additionally, benefits and drawbacks of current array databases are addressed, and suggestions are made for their improvement.

Breast Neoplasms↗

The story of the British special migration statistics.

"This paper describes a new data set from the 1991 Census called the Special Migration Statistics. Before release for general use by the U.K. social science and geographic community, it was essential to understand and to thoroughly check the data. This paper reports on the structure of the database and the checks carried out to verify its internal and external consistency. Finally, the paper summarises the pattern of migration revealed by the statistics for two illustrative spatial systems: wards in a large northern city and regions in Great Britain." The focus is on internal migration.

Censuses↗

[Cellular automata approach to biological pattern formation (I): the aggregation pattern in dictyostelium discoideum].

The investigation of the mechanism of biological pattern has been an important topic of life sciences, especially, of developmental biology, for a long time. It is an interdisciplinary problem and many researching data have been obtained and some theories have been structured from many points of view in science. However, up to now, the actual mechanism is still a fascinating puzzle and needs more studies. In this paper, we try to construct a cellular automata model of biological pattern. This model defines the individual model cells and their behaviors, cell-cell interactions, and cell-environment interactions. As an application, we present a new discrete model to simulate the aggregation phase of the development of Dictyostelium discoideum with the concept of "inducing switch".

Animals↗

Exploration of "alternative" and "natural" drugs in dermatology.

OBJECTIVE: To review some of the promising natural remedies within dermatology to explore their potential clinical benefit in supplementing conventional drugs. DATA SOURCES: MEDLINE searches from January 1966 through October 2000 and Science Citation Index searches from January 1974 through October 2000 were conducted. STUDY SELECTION: Primary importance was given to in vivo and in vitro controlled studies, the results of which encourage further exploration. DATA EXTRACTION: The controls used, the statistical approach to analysis, and the validity of the experimental method analyzed were considered particularly important. Data were independently extracted by multiple observers. DATA SYNTHESIS: Natural remedies seem promising in treating a wide variety of dermatologic disorders, including inflammation, phototoxicity, psoriasis, atopic dermatitis, alopecia areata, and poison oak. CONCLUSIONS: The alternative medications presented seem promising, although their true effects are unknown. Many of the presented studies do not allow deduction of clinical effects. Further experimentation must be performed to assess clinical benefit.

Ascorbic Acid↗