Oligonucleotide Synthesis on Linear Reactive Polymer Grafted onto Solid Support,Medical Diagnostics Applications

Abstract

A new strategy has been developed to obtain polymer-ODN conjugates. However, free ODN appeared to contaminate synthesis. Various hypotheses are described herein to explain this side reaction.     

Platelet-rich plasma and chronic wounds: remaining fibronectin may influence matrix remodeling and regeneration success

BackgroundPlatelet-rich plasma has been largely used as a therapeutic option for the treatment of chronic wounds of different etiologies. The enhanced regeneration observed after the use of platelet-rich plasma has been systematically attributed to the growth factors that are present inside platelets' granules.AimWe hypothesize that the remaining plasma and platelet-bound fibronectin may act as a further bioactive protein in platelet-rich plasma preparations.MethodsRecent reports were analyzed and presented as direct evidences of this hypotheses.ResultsFibronectin may directly influence the extracellular matrix remodeling during wound repair. This effect is probably through matrix metalloproteinase expression, thus exerting an extra effect on chronic wound regeneration.ConclusionsPhysicians should be well aware of the possible fibronectin-induced effects in their future endeavors with PRP in chronic wound treatment.     

Perils of single life and benefits of marriage

Abstract

It has long been observed that married persons experience more favorable mortality than unmarried persons. Hypotheses about possible explanations for mortality differentials by marital status fall into three general categories: (1) hypotheses regarding errors in the data, (2) hypotheses related to the selection of persons into and out of marital states, and (3) hypotheses regarding environmental and behavioral factors associated with various marital states. In this paper the authors investigate the extent to which mortality differences by marital status are similar across populations and assess the importance of selection factors in producing the excess mortality of the single populations.     

Ichnologic note

A discovery of a new site with dinosaur tracks from central Italy dramatically alters former palaeontological and paleogeographical hypotheses on the Jurassic of this area.     

Estudio preliminar de la efectividad de la terapia asistida con perros en personas de la tercera edad

IntroductionAnimal-assisted therapy is increasingly present in several educational and health areas. The aim of this study is to assess the effectiveness of such interventions in the elderly population living in residential settings.Materials and methodsA 12-week dog-assisted intervention program was designed, with 16 participants from a nursing home divided into an experimental group and a control group.ResultsSeveral physical and psychological variables were assessed before and after the intervention. While there were no significant differences in the control group, the experimental group improved significantly after participating in the program.DiscussionThe results support the hypothesis that animal-assisted interventions may be beneficial for residents in elderly care homes.     

Adoption of an incident learning system in a regionally expanding academic radiation oncology department

Aim and BackgroundWe describe a successful implementation of a departmental incident learning system (ILS) across a regionally expanding academic radiation oncology department, dovetailing with a structured integration of the safety and quality program across clinical sites.Materials and methods mOver 6 years between 2011 and 2017, a long-standing departmental ILS was deployed to 4 clinical locations beyond the primary clinical location where it had been established. We queried all events reported to the ILS during this period and analyzed trends in reporting by clinical site. The chi-square test was used to determine whether differences over time in the rate of reporting were statistically significant. We describe a synchronous development of a common safety and quality program over the same period.ResultsThere was an overall increase in the number of event reports from each location over the time period from 2011 to 2017. The percentage increase in reported events from the first year of implementation to 2017 was 457% in site 1, 166.7% in site 2, 194.3% in site 3, 1025% in site 4, and 633.3% in site 5, with an overall increase of 677.7%. A statistically significant increase in the rate of reporting was seen from the first year of implementation to 2017 (p < 0.001 for all sites).ConclusionsWe observed significant increases in event reporting over a 6-year period across 5 regional sites within a large academic radiation oncology department, during which time we expanded and enhanced our safety and quality program, including regional integration. Implementing an ILS and structuring a safety and quality program together result in the successful integration of the ILS into existing departmental infrastructure.     

Metallobiology and therapeutic chelation of biometals (copper,zinc and iron) in Alzheimer’s disease: Limitations,and current and future perspectives

BackgroundAlzheimer's disease (AD) is the most prevalent cause of cognitive impairment and dementia worldwide. The pathobiology of the disease has been studied in the form of several hypotheses, ranging from oxidative stress, amyloid-beta (Aβ) aggregation, accumulation of tau forming neurofibrillary tangles (NFT) through metal dysregulation and homeostasis, dysfunction of the cholinergic system, and to inflammatory and autophagic mechanism. However, none of these hypotheses has led to confirmed diagnostics or approved cure for the disease.ObjectiveThis review is aimed as a basic and an encyclopedic short course into metals in AD and discusses the advances in chelation strategies and developments adopted in the treatment of the disease. Since there is accumulating evidence of the role of both biometal dyshomeostasis (iron (Fe), copper (Cu), and zinc (Zn)) and metal-amyloid interactions that lead to the pathogenesis of AD, this review focuses on unraveling therapeutic chelation strategies that have been considered in the treatment of the disease, aiming to sequester free and protein-bound metal ions and reducing cerebral metal burden. Promising compounds possessing chemically modified moieties evolving as multi-target ligands used as anti-AD drug candidates are also covered.Results and ConclusionSeveral multidirectional and multifaceted studies on metal chelation therapeutics show the need for improved synthesis, screening, and analysis of compounds to be able to effectively present chelating anti-AD drugs. Most drug candidates studied have limitations in their physicochemical properties; some enhance redistribution of metal ions, while others indirectly activate signaling pathways in AD. The metal chelation process in vivo still needs to be established and the design of potential anti-AD compounds that bi-functionally sequester metal ions as well as inhibit the Aβ aggregation by competing with the metal ions and reducing metal-induced oxidative damage and neurotoxicity may signal a bright end in chelation-based therapeutics of AD.     

Asymmetric Synthesis of Cyclopropyl Carbocyclic Nucleosides

Abstract

A number of nucleosides have been synthesized as potential antiviral and antitumor agents.¹ More recently, various dideoxynucleosides have been synthesized and found to be potent anti-HIV agents.² As a part of our drug discovery program for the treatment of HIV and HBV, we have initiated to synthesize cyclopropyl carbocyclic nucleosides as potential antiviral agents. Several papers regarding the synthesis of cyclopropyl carbocyclic nucleosides have appeared in the literature.^3–5 However, they are all reported as racemic mixtures. In this abstract, we wish to report the asymmetric synthesis of cylopropyl carbocyclic nucleosides from optically active common intermediates, 6 and 11.     

Eficiencia del apoyo de Geriatría Transversal en el manejo de pacientes mayores de 80 años ingresados en el Servicio de Cirugía General. Resultados en la liberación de estancias y el coste asociado

ObjectiveTo determine the efficiency of «Cross-speciality Geriatrics» program in patients older than 80 years admitted to the Colorectal Pathology Unit of a General Surgery Department.Material and methodsA «before-after» study was conducted. The initial period (usual treatment for General Surgery) included patients admitted from 1^st January to 31^st August 2018, and the subsequent period (with support from geriatrics) from 1^st January to 31^st December 2019. Two types of patients were studied: Type 1, who were admitted to the Emergency Department, and Type 2, programmed admissions for colorectal cancer intervention. The Geriatrics intervention consisted of daily monitoring in the ward, collaboration in clinical management, and discharge planning. Furthermore, in Type 2 patients, a previous visit was made in the clinic, which included the detection and approach of frailty and pre-habilitation for surgery.ResultsA total of 175 patients were included, of whom 53 were treated by General Surgery and 122 with the co-management of geriatrics. The mean age was 84.9 years (SD 4.8). In the period with the Cross-speciality Geriatrics program, the mean stay was reduced by 10.6 days (39%), and 8.5 days (44%) in types 1 and 2, respectively (P < .01). This led to a decrease in bed occupancy (3.3 beds/day) and a cost reduction (1,215,970 € / year).ConclusionsThe support of Cross-speciality Geriatrics in patients older than 80 years admitted to General Surgery is an efficient care model. These data support its implementation in hospitals where this care line has not yet been developed     

Genome size evolution is associated with climate seasonality and glucosinolates,but not life history,soil nutrients or range size,across a clade of mustards

Background and AimsWe investigate patterns of evolution of genome size across a morphologically and ecologically diverse clade of Brassicaceae, in relation to ecological and life history traits. While numerous hypotheses have been put forward regarding autecological and environmental factors that could favour small vs. large genomes, a challenge in understanding genome size evolution in plants is that many hypothesized selective agents are intercorrelated.MethodsWe contribute genome size estimates for 47 species of Streptanthus Nutt. and close relatives, and take advantage of many data collections for this group to assemble data on climate, life history, soil affinity and composition, geographic range and plant secondary chemistry to identify simultaneous correlates of variation in genome size in an evolutionary framework. We assess models of evolution across clades and use phylogenetically informed analyses as well as model selection and information criteria approaches to identify variables that can best explain genome size variation in this clade.Key ResultsWe find differences in genome size and heterogeneity in its rate of evolution across subclades of Streptanthus and close relatives. We show that clade-wide genome size is positively associated with climate seasonality and glucosinolate compounds. Model selection and information criteria approaches identify a best model that includes temperature seasonality and fraction of aliphatic glucosinolates, suggesting a possible role for genome size in climatic adaptation or a role for biotic interactions in shaping the evolution of genome size. We find no evidence supporting hypotheses of life history, range size or soil nutrients as forces shaping genome size in this system.ConclusionsOur findings suggest climate seasonality and biotic interactions as potential forces shaping the evolution of genome size and highlight the importance of evaluating multiple factors in the context of phylogeny to understand the effect of possible selective agents on genome size.     

Evaluación económica de la vacunación frente al neumococo en mayores de 65 años de Castilla y León

IntroductionThe burden of disease due to pneumonia in older adults has a major impact on health systems.The aim of this study is to carry out an economic evaluation of the vaccination strategy against Streptococcus pneumoniae using the 13-valent pneumococcal conjugate vaccine.Material and methodsA simulated economic model has been developed in the form of a decision tree to evaluate the cost of the vaccination strategy in the population over 65 years of the Valladolid-East Health Area, versus non-vaccination, using a Monte Carlo probabilistic analysis.ResultsStreptococcus pneumoniae annually generates 557.24 cases of pneumococcal disease in the Valladolid-East Health Area, and 506.60 episodes have pneumonia symptoms. Vaccination of the cohort over 65 years of age is an efficient measure from the third year, with a cost per quality-adjusted life years (QALY) of 20,496.20 €. The number of QALYs gained in a decade is 86.07 and an amount of 216.252.89 € with this vaccination strategy would be saved.ConclusionsThe evaluation of the different incremental costs (QALY,euros) in the years of follow-up, the pneumococcus vaccination program in people over 65 in Castilla y León is cost-effective.     

RADBIOMOD: A simple program for utilising biological modelling in radiotherapy plan evaluation

PurposeRadiotherapy plan evaluation is currently performed by assessing physical parameters, which has many limitations. Biological modelling can potentially allow plan evaluation that is more reflective of clinical outcomes, however further research is required into this field before it can be used clinically.MethodsA simple program, RADBIOMOD, has been developed using Visual Basic for Applications (VBA) for Microsoft Excel that incorporates multiple different biological models for radiotherapy plan evaluation, including modified Poisson tumour control probability (TCP), modified Zaider–Minerbo TCP, Lyman–Kutcher–Burman normal tissue complication probability (NTCP), equivalent uniform dose (EUD), EUD-based TCP, EUD-based NTCP, and uncomplicated tumour control probability (UTCP). RADBIOMOD was compared to existing biological modelling calculators for 15 sample cases.ResultsComparing RADBIOMOD to the existing biological modelling calculators, all models tested had mean absolute errors and root mean square errors less than 1%.ConclusionsRADBIOMOD produces results that are non-significantly different from existing biological modelling calculators for the models tested. It is hoped that this freely available, user-friendly program will aid future research into biological modelling.     

Habitat heterogeneity,temperature, and primary productivity drive elevational gradients in avian species diversity

AimAnticipating and mitigating the impacts of climate change on species diversity in montane ecosystems requires a mechanistic understanding of drivers of current patterns of diversity. We documented the shape of elevational gradients in avian species richness in North America and tested a suite of a priori predictions for each of five mechanistic hypotheses to explain those patterns.LocationUnited StatesMethodsWe used predicted occupancy maps generated from species distribution models for each of 646 breeding birds to document elevational patterns in avian species richness across the six largest U.S. mountain ranges. We used spatially explicit biotic and abiotic data to test five mechanistic hypotheses proposed to explain geographic variation in species richness.ResultsElevational gradients in avian species richness followed a consistent pattern of low elevation plateau‐mid‐elevation peak (as per McCain, 2009). We found support for three of the five hypotheses to explain the underlying cause of this pattern: the habitat heterogeneity, temperature, and primary productivity hypotheses.Main ConclusionsSpecies richness typically decreases with elevation, but the primary cause and precise shape of the relationship remain topics of debate. We used a novel approach to study the richness‐elevation relationship and our results are unique in that they show a consistent relationship between species richness and elevation among 6 mountain ranges, and universal support for three hypotheses proposed to explain the underlying cause of the observed relationship. Taken together, these results suggest that elevational variation in food availability may be the ecological process that best explains elevational gradients in avian species richness in North America. Although much attention has focused on the role of abiotic factors, particularly temperature, in limiting species’ ranges, our results offer compelling evidence that other processes also influence (and may better explain) elevational gradients in species richness.     

住院医师对规范化培训制度的认知态度调查

????? 目的 了解上海市住院医师规范化培训制度实施1年来住院医师对培训的认知与态度状况,为发现培训中的问题、提出改进意见提供信息支持。方法 对上海市2010年招录的住院医师进行抽样问卷调查。结果 住院医师对规范化培训的认知情况较好,仅有0.89%的人认为自己对医院的培训工作完全不了解;对于培训的态度也比较积极,占总数56.37%的人认为参加培训使自己在未来工作中有一定优势;对培训的总体满意度也较高,但其中薪酬满意度仅2.88。结论 上海市住院医师规范化培训一年来取得了一定成效,2010年招录的住院医师培训对培训政策的认识不断加深,态度与看法正面积极,在培训内容、基地设施、带教水平、师资为人和带教积极性方面的满意程度也较高。建议从更加细致化和规范化的角度来完善政策。

     

The Implementation of the Iterative Diagonalization Scheme and ab initio Molecular Dynamics Simulation with the LAPW Method

Abstract

A new ab initio molecular dynamics method based on the full-potential linearized-augmented-plane-wave (LAPW) basis set has been implemented. The LAPW basis set has been successfully employed for systems containing localized electrons such as first row atoms and transition metals. In our implementation of the LAPW-MD scheme, iterative residual minimization algorithm is used to solve the electronic states problem. The atoms are moved according to forces derived from the Hellman–Feynman theorem and incomplete basis set correction terms. The performance of the program is further enhanced by parallelization. We will discuss technical details of the program implementation and present results obtained from this code to the equilibrium structures and vibrational properties of simple diatomic molecules.     

An Update on the Louisiana and Texas Rigs-to-Reefs Programs in the Gulf of Mexico

Abstract

The Louisiana and Texas Rigs-to-Reefs programs enjoy widespread public, industry, and government support and have become models for similar programs around the world. Louisiana’s Rigs-to-Reefs program is the largest in the world, and since its inception in 1986 about 363 oil and gas platforms have been donated, or on average about 12 structures per year. Texas’s Rigs-to-Reefs program started in 1990, and since this time about 154 structures have been donated, or about six structures per year. A summary update of the Louisiana and Texas reef programs is provided, along with recent changes in legislative activity. Donation trends and statistics are reviewed. The Rigs-to-Reefs programs are unlikely to see donation activity above historic levels, and both programs should start planning for a future where the income generated from future projects diminishes.     

Development of ETB Selective Agonists: Solution Structure of a Linear Endothelin-1 Analogue,ET-1 [Cys(Acm)1,15, Ala3, Leu7, dAsp8, Aib11]

Abstract

The solution structure of a synthetic ET_B selective agonist, ET-l[Cys(Acm)^1,15, Ala³, Leu⁷, dAsp⁸, Aib¹¹] has been solved by ¹H NMR and molecular modelling studies. Such solution structures of linear modified peptides in aqueous methanol are being used in an ongoing program of research designed to assist in an understanding of the basic structural requirements for the biological activity of vasoconstrictors. The resulting structure of this peptide is characterised by an α-helical conformation between residues Leu⁶-His¹⁶ and by N- and C-termi- ni which assume no defined conformation. A knowledge of the solution structures of this and related peptides, which are ETB selective agonists, are proving to be important in the understanding of how they interact with the ETB receptor.     

Breeding ecology of Kentish Plover Charadrius alexandrinus in an extremely hot environment

Capsule Hot environments are associated with more biparental care, high nest‐site fidelity and low mate fidelity.

Aims To investigate the breeding ecology and parental behaviour of Kentish Plovers in an extremely hot environment. Kentish Plovers have an unusually diverse breeding system in which the frequencies of biparental, female‐only and male‐only care vary between populations. A common, but rarely tested, explanation for such a variation is local adaptation: birds exhibit social traits that are adaptive to their breeding environment. In particular, we investigated the effect of a hot environment on breeding success, distribution of care types, and mate and site fidelity.

Methods A breeding population of approximately 200 pairs of Kentish Plovers was investigated in 2005 and 2006 at Al Wathba Wetland near Abu Dhabi in the United Arab Emirates.

Results We found high nest‐site fidelity, low mate fidelity and more biparental care in Al Wathba than in most temperate zone populations of Kentish Plovers.

Conclusions Our results are consistent with the argument that a harsh environment can select for biparental care. However, further studies are warranted to distinguish between alternative hypotheses for the different distribution of social behaviours of breeding populations.     

Effects of a core stability exercise program on balance and coordination in children with cerebellar ataxic cerebral palsy

Objective:To evaluate the effects of a core stability exercise program on balance, coordination, and severity of ataxia in children with cerebellar ataxic cerebral palsy (CP).Methods:Forty children with cerebellar ataxic CP (mean age: 6.75±1.35 years) were randomly assigned to a control group and an intervention group for 2 months of follow-up. The control group received a standard physical therapy program three times weekly (1 h per session), while the intervention group received a core stability program for 30 min, in addition to the selected physical therapy program. Both groups were evaluated pre-treatment and post-treatment using the Scale for the Assessment and Rating of Ataxia, the Balance Error Scoring Systems scale, Bruininks-Oseretsky tests of motor proficiency, and HUMAC balance system scores.Results:We found statistically significant reductions in the severity of ataxia, as well as improved balance and coordination in both groups, with stronger effects observed in the intervention group (P<0.05).Conclusion:The core stability program can improve balance and coordination in children with cerebellar ataxic CP when incorporated with a standard physical therapy program.     

Efficacy of two intervention approaches on functional walking capacity and balance in children with Duchene muscular dystrophy

Objectives:Children with Duchene muscular dystrophy have weak muscles, which may impair postural adjustments. These postural adjustments are required for gait and dynamic balance during the daily living activities. The aim was to compare between the effect of bicycle ergometer versus treadmill on functional walking capacity and balance in children with Duchenne muscular dystrophy.Methods:Thirty boys aged from 6 to 10 years old diagnosed as Duchene muscular dystrophy participated in this study. Children were assigned randomly into two groups (A&B). Children in group (A) underwent a designed program of physical therapy plus aerobic exercise training in form of bicycle ergometer while, group (B) received the same program as group (A) and aerobic exercise training by treadmill for one hour, at three times a week for three successive months. Functional walking capacity and balance were assessed before and after treatment by using the 6-minute walk test and Biodex balance system equipment respectively.Results:The post treatment results revealed significant difference in all measured variables (P<0.05) as compared with its pre-treatment results. Post-treatment values indicated that there was a significant difference in all measured variables in favor of group B.Conclusions:treadmill training as an aerobic exercise can improve walking capacity and balance more effectively than bicycle ergometer in children with Duchenne muscular dystrophy.