A simple and versatile 2-dimensional platform to study plant germination and growth under controlled humidity

We describe a simple, inexpensive, but remarkably versatile and controlled growth environment for the observation of plant germination and seedling root growth on a flat, horizontal surface over periods of weeks. The setup provides to each plant a controlled humidity (between 56% and 91% RH), and contact with both nutrients and atmosphere. The flat and horizontal geometry of the surface supporting the roots eliminates the gravitropic bias on their development and facilitates the imaging of the entire root system. Experiments can be setup under sterile conditions and then transferred to a non-sterile environment. The system can be assembled in 1-2 minutes, costs approximately 8.78$ per plant, is almost entirely reusable (0.43$ per experiment in disposables), and is easily scalable to a variety of plants. We demonstrate the performance of the system by germinating, growing, and imaging Wheat (Triticum aestivum), Corn (Zea mays), and Wisconsin Fast Plants (Brassica rapa). Germination rates were close to those expected for optimal conditions.

Distinct clinical and neuropathological features of G51D SNCA mutation cases compared with SNCA duplication and H50Q mutation

Background: We and others have described the neurodegenerative disorder caused by G51D SNCA mutation which shares characteristics of Parkinson’s disease (PD) and multiple system atrophy (MSA). The objective of this investigation was to extend the description of the clinical and neuropathological hallmarks of G51D mutant SNCA-associated disease by the study of two additional cases from a further G51D SNCA kindred and to compare the features of this group with a SNCA duplication case and a H50Q SNCA mutation case. Results: All three G51D patients were clinically characterised by parkinsonism, dementia, visual hallucinations, autonomic dysfunction and pyramidal signs with variable age at disease onset and levodopa response. The H50Q SNCA mutation case had a clinical picture that mimicked late-onset idiopathic PD with a good and sustained levodopa response. The SNCA duplication case presented with a clinical phenotype of frontotemporal dementia with marked behavioural changes, pyramidal signs, postural hypotension and transiently levodopa responsive parkinsonism. Detailed post-mortem neuropathological analysis was performed in all cases. All three G51D cases had abundant α-synuclein pathology with characteristics of both PD and MSA. These included widespread cortical and subcortical neuronal α-synuclein inclusions together with small numbers of inclusions resembling glial cytoplasmic inclusions (GCIs) in oligodendrocytes. In contrast the H50Q and SNCA duplication cases, had α-synuclein pathology resembling idiopathic PD without GCIs. Phosphorylated α-synuclein was present in all inclusions types in G51D cases but was more restricted in SNCA duplication and H50Q mutation. Inclusions were also immunoreactive for the 5G4 antibody indicating their highly aggregated and likely fibrillar state. Conclusions: Our characterisation of the clinical and neuropathological features of the present small series of G51D SNCA mutation cases should aid the recognition of this clinico-pathological entity. The neuropathological features of these cases consistently share characteristics of PD and MSA and are distinct from PD patients carrying the H50Q or SNCA duplication.

Gender diversity and board performance: women's experiences and perspectives

Despite considerable progress that organizations have made during the past 20 years to increase the representation of women at board level, they still hold few board seats. Drawing on a qualitative study involving 30 companies with women directors in the United Kingdom, the United States, and Ghana, we investigate how the relationship between gender in the boardroom and corporate governance operates. The fi ndings indicate that the presence of a minority of women on the board has an insignifi cant effect on board performance. Yet the chairperson’s role is vital in leading the change for recruiting and evaluating candidates and their commitment to the board with diversity and governance in mind. Our study also sheds light on the multifaceted reasons why women directors appear to be resisting the discourse of gender quotas.

Strategies for combating gendered perceptions of careers

Purpose – Earlier work on career choice has identified that career choice involves gendered processes which lead to differentiated career outcomes for women and men. However, this literature remained anaemic in offering career counselling strategies for addressing the negative impacts of these processes. The paper aims to explore the creativity cycle and other tools derived from personal construct psychology (PCP) and other feminist literature as potential means for dissolving gendered perceptions of various professions and organisational practices. Design/methodology/approach – This is a conceptual paper. Findings – The paper argues that PCP can provide a theoretical and methodological framework for discussing how dichotomous and gender identified the perceptions of professions can be and how such perceptions might be challenged. Practical implications – This theory and its techniques allow us an exploration of the flexibility of one’s constructions system, which determines a person’s ability to construe alternative views and to develop new ways of understanding oneself and others. Originality/value – The PCP’s potential as a technique to combat gendered perceptions of a career is examined.

Genetic and phenotypic characterization of complex hereditary spastic paraplegia

The hereditary spastic paraplegias are a heterogeneous group of degenerative disorders that are clinically classified as either pure with predominant lower limb spasticity, or complex where spastic paraplegia is complicated with additional neurological features, and are inherited in autosomal dominant, autosomal recessive or X-linked patterns. Genetic defects have been identified in over 40 different genes, with more than 70 loci in total. Complex recessive spastic paraplegias have in the past been frequently associated with mutations in SPG11 (spatacsin), ZFYVE26/SPG15, SPG7 (paraplegin) and a handful of other rare genes, but many cases remain genetically undefined. The overlap with other neurodegenerative disorders has been implied in a small number of reports, but not in larger disease series. This deficiency has been largely due to the lack of suitable high throughput techniques to investigate the genetic basis of disease, but the recent availability of next generation sequencing can facilitate the identification of disease- causing mutations even in extremely heterogeneous disorders. We investigated a series of 97 index cases with complex spastic paraplegia referred to a tertiary referral neurology centre in London for diagnosis or management. The mean age of onset was 16 years (range 3 to 39). The SPG11 gene was first analysed, revealing homozygous or compound heterozygous mutations in 30/97 (30.9%) of probands, the largest SPG11 series reported to date, and by far the most common cause of complex spastic paraplegia in the UK, with severe and progressive clinical features and other neurological manifestations, linked with magnetic resonance imaging defects. Given the high frequency of SPG11 mutations, we studied the autophagic response to starvation in eight affected SPG11 cases and control fibroblast cell lines, but in our restricted study we did not observe correlations between disease status and autophagic or lysosomal markers. In the remaining cases, next generation sequencing was carried out revealing variants in a number of other known complex spastic paraplegia genes, including five in SPG7 (5/97), four in FA2H (also known as SPG35) (4/97) and two in ZFYVE26/SPG15. Variants were identified in genes usually associated with pure spastic paraplegia and also in the Parkinson’s disease-associated gene ATP13A2, neuronal ceroid lipofuscinosis gene TPP1 and the hereditary motor and sensory neuropathy DNMT1 gene, highlighting the genetic heterogeneity of spastic paraplegia. No plausible genetic cause was identified in 51% of probands, likely indicating the existence of as yet unidentified genes.

Observation of the antimatter helium-4 nucleus

High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang(1); in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter. The antimatter helium-4 nucleus ((4)(He) over bar), also known as the anti-alpha ((alpha) over bar), consists of two antiprotons and two antineutrons (baryon number B = -4). It has not been observed previously, although the alpha-particle was identified a century ago by Rutherford and is present in cosmic radiation at the ten per cent level(2). Antimatter nuclei with B -1 have been observed only as rare products of interactions at particle accelerators, where the rate of antinucleus production in high-energy collisions decreases by a factor of about 1,000 with each additional antinucleon(3-5). Here we report the observation of (4)<(He) over bar, the heaviest observed antinucleus to date. In total, 18 (4)(He) over bar counts were detected at the STAR experiment at the Relativistic Heavy Ion Collider (RHIC; ref. 6) in 10(9) recorded gold-on-gold (Au+Au) collisions at centre-of-mass energies of 200 GeV and 62 GeV per nucleon-nucleon pair. The yield is consistent with expectations from thermodynamic(7) and coalescent nucleosynthesis(8) models, providing an indication of the production rate of even heavier antimatter nuclei and a benchmark for possible future observations of (4)(He) over bar in cosmic radiation.

Evidence that OGG1 glycosylase protects neurons against oxidative DNA damage and cell death under ischemic conditions

7,8-Dihydro-8-oxoguanine DNA glycosylase (OGG1) is a major DNA glycosylase involved in base-excision repair (BER) of oxidative DNA damage to nuclear and mitochondrial DNA (mtDNA). We used OGG1-deficient (OGG1(-/-)) mice to examine the possible roles of OGG1 in the vulnerability of neurons to ischemic and oxidative stress. After exposure of cultured neurons to oxidative and metabolic stress levels of OGG1 in the nucleus were elevated and mitochondria exhibited fragmentation and increased levels of the mitochondrial fission protein dynamin-related protein 1 (Drp1) and reduced membrane potential. Cortical neurons isolated from OGG1(-/-) mice were more vulnerable to oxidative insults than were OGG1(+/+) neurons, and OGG1(-/-) mice developed larger cortical infarcts and behavioral deficits after permanent middle cerebral artery occlusion compared with OGG1(+/+) mice. Accumulations of oxidative DNA base lesions (8-oxoG, FapyAde, and FapyGua) were elevated in response to ischemia in both the ipsilateral and contralateral hemispheres, and to a greater extent in the contralateral cortex of OGG1(-/-) mice compared with OGG1(+/+) mice. Ischemia-induced elevation of 8-oxoG incision activity involved increased levels of a nuclear isoform OGG1, suggesting an adaptive response to oxidative nuclear DNA damage. Thus, OGG1 has a pivotal role in repairing oxidative damage to nuclear DNA under ischemic conditions, thereby reducing brain damage and improving functional outcome. Journal of Cerebral Blood Flow & Metabolism (2011) 31, 680-692; doi:10.1038/jcbfm.2010.147; published online 25 August 2010

Upplevelser av bemötande i vården hos patienter med fibromyalgi- en litteraturöversikt

Bakgrund: Fibromyalgi är ett långvarigt kroniskt smärttillstånd som grundar sig på individens subjektiva smärtupplevelse. Syfte: Syftet var att beskriva hur patienter med fibromyalgi upplevt bemötande i vården. Metod: Denna litteraturöversikt baseras på tretton vetenskapliga artiklar. Resultat: Resultatet resulterade i två huvudkategorier "Patienters upplevelser av bemötande" och "Kunskap och stöd från vårdpersonalen". Patienterna med fibromyalgi upplever dåligt bemötande och att vårdpersonal saknar kunskap om både diagnos och behandling av fibromyalgi. I vården upplever dessa patienter misstro och att de blir dåligt bemötta när de söker för sina smärtsymtom. Patienter med fibromyalgidiagnos önskar ett personcentrerat bemötande och mer tid av sina läkare. Slutsatser: Litteraturöversikten visar att patienter med fibromyalgi i stor utsträckning uppger att de upplever dåligt bemötande, okunskap och brist på engagemang i vården. Framtida forskningen bör fokusera på hur vården kan arbeta mer personcentrerat i denna patientgrupp till exempel genom interventionsstudier.

Na negação dos muros, a mirada ambiental na perspectiva do ser guarani : a questão da educação escolar

A presente Dissertação tem como objeto a perspectiva ambiental na educação escolar Guarani. Para se constituir enquanto tal, buscou, no próprio seio da comunidade e da Escola Indígena, as respostas para o questionamento de como se dará, na Escola pensada pelos Guarani, a perspectiva ambiental: na sua própria teko’a, na relação com a Cidade e na relação com a tecnologia cidadã. Na busca de uma sistematização de possíveis respostas, primeiro, traça-se uma perspectiva antropológica da própria Cidade, lugar fundante da Escola, desde a ótica de Rodolfo Kusch sobre a relação entre o ambiente natural - no qual o granizo e a chuva, la ira de Dios, representam o temor – e o ambiente artificial – constituído no ambiente cidadão, onde reina la ira del hombre, representado no objeto e no afã de ser alguém; em segundo, apresenta-se os próprios Guarani e seu mero estar e, finalmente, em terceiro, a Escola e a perspectiva ambiental que perpassa o pensá-la e o próprio ensinar. A pesquisa foi realizada a partir das observações e conversas com as lideranças, os professores e os Karaí. Para tanto, serviu-se de instrumento do Diário de Campo, das gravações de entrevistas e dos registros fotográficos. A análise dos dados teve como substrato teórico a perspectiva do Cuidado, fundamentada em Martin Heidegger e da antropologia filosófica americana, fundamentada em Rodolfo Kusch. O trabalho mostra duas culturas – a cultura cidadã e a cultura Mbyá-Guarani – que se colocam na intersecção da própria Escola, onde um embrião de uma nova Escola, que já não aponta para o conhecimento científico como fundamento das suas práticas, parece estar se constituindo no ambiente da Tekoá.

Inclusão social do deficiente visual: experiência e resultados de Assis

OBJETIVOS: Traçar o perfil do usuário da Sala de Recursos para Deficiente Visual na cidade de Assis - SP, avaliar a porcentagem de deficientes visuais empregados e comparar o emprego com idade, gênero, tipo de deficiência e doença causadora da deficiência, entre dois períodos: de 1984 a 1996 e de 1997 a 2009. MÉTODOS: Foi realizado estudo retrospectivo dos prontuários médicos e da ficha escolar dos portadores de deficiência visual que frequentaram a Sala de Recursos para Deficiente Visual, no período de 1984 a 2009 na cidade de Assis - SP, divididos em dois períodos de 1984 a 1996 (G1) e de 1997 a 2009 (G2). Analisaram-se dados demográficos, a doença que provocou a baixa visão, o tipo de deficiência visual (cegueira ou baixa visão), escolaridade, recursos ópticos, frequência à Sala de Recursos para Deficiente Visual e taxa de emprego. Foi feita associação da taxa de emprego com: idade, gênero, raça/cor, tipo de deficiência e doença nos dois diferentes períodos. RESULTADOS: Foram encontrados 149 deficientes visuais sendo: 61,07% homens, 38,9% mulheres, 82,5% brancos e 17,4% não brancos e a mediana da idade foi de 18 anos. Dos 149 deficientes visuais, 63,75% eram portadores de baixa visão e 36,24% portadores de cegueira. As principais doenças que levaram à deficiência visual dos 149 pacientes foram em ordem decrescente: retinocoroidite por toxoplasmose (17,40%), atrofia óptica congênita (12,10%), alta hipermetropia (8,72%), retinose pigmentar e alta miopia (6,71% cada uma) e glaucoma congênito e catarata congênita (6,04% cada uma). A frequência à Sala de Recursos para Deficiente Visual foi boa em mais de 50% dos pacientes. Estavam trabalhando regularmente 44,7% e 12,3% dos maiores de 14 anos respectivamente nos períodos de 1984 - 1996 e de 1997 - 2009. Não houve diferença entre os dois períodos quanto às características demográficas, tipo de deficiência e doenças, havendo correlação da taxa de emprego apenas com a idade (pacientes com média de idade maior apresentavam maior porcentagem de emprego). CONCLUSÕES: Os deficientes visuais eram na maioria homens, brancos, portadores de baixa visão e portadores de toxoplasmose ocular. Quase metade (44,7%) dos pacientes com mais de 14 anos encontrava-se trabalhando regularmente até 1996 sugerindo que esforços conjuntos de oftalmologistas e educadores auxilia na inclusão social destes pacientes. A taxa de emprego caiu no período de 1997 a 2009 e a de aposentados aumentou.

Genetic Responses to Nanostructured Calcium-phosphate-coated Implants

Nanostructured calcium phosphate (CaP) has been histologically and biomechanically proven to enhance osseointegration of implants; however, conventional techniques were not sufficiently sensitive to capture its biological effects fully. Here, we compared the conventional removal torque (RTQ) evaluation and gene expression in tissues around nanostructured CaP-coated implants, using real-time RT-PCR, with those of uncoated implants, in a rabbit model. At 2 wks, RTQ values were significantly higher, alkaline phosphatase (ALP) expression was significantly higher, and runt-related transcription factor 2 and tumor necrosis factor-alpha expressions were significantly lower in the coated than in the uncoated implants. This indicates that inflammatory responses were suppressed and osteoprogenitor activity increased around the CaP-coated surface. At 4 wks, although RTQ values did not significantly differ between the 2 groups, ALP and osteocalcin (OCN) were significantly up-regulated in the coated group, indicating progressive mineralization of the bone around the implant. Moreover, an osteoclast marker, adenosine triphosphatase, which indicates acidification of the resorption lacunae, was significantly higher for the coated implants, suggesting gradual resorption of the CaP coating. This study reveals detailed genetic responses to nanostructured CaP-coated implants and provides evidence that the effect of nanotopography is significant during the osseointegration cascade.

Cataract Remains an Important Cause of Blindness in Campinas, Brazil

Objective: To estimate the prevalence of blindness in the elderly population of Campinas, Brazil, and to describe the coverage and quality of cataract surgery services in the area. Methods: A brief assessment of cataract surgery services (using the RACSS (Rapid Assessment of Cataract Surgical Services Method) was conducted using random cluster sampling, with a sample composed of 60 clusters of 40 people aged 50 years or older. Visual acuity (VA) was measured and the lens status observed by direct visual ophthalmoscopy. From the selected sample of 2,400 subjects, 92.67% were examined. Results: Blindness (VA 3/60 with available correction) was found in 1.98 % (2.03 % among male subjects, and 1.94 % among female subjects). The prevalence of blindness varied with age, from 0.2%, in the group from 50 to 54 years, to 7.2% in those above 80. Cataract was the main cause of blindness (40.2%) followed by suspected posterior segment disorders (18.2%), diabetic retinopathy (15.9%), and glaucoma (11.4%). The cataract surgical coverage was of 93% (VA 3/60) and 82.18% when the criterion was VA 6/60 in the best eye. The main reasons the subjects did not receive surgical treatment were: fear of undergoing surgery, 11.1%; lack of awareness about the condition, 16.7%; waiting for maturity, 16.7%; and contraindication to surgery, 44.4%. Conclusion: Cataract is the major cause of blindness in Campinas. Education on eye diseases, their prevention and treatment must become part of the city's public healthcare policies.

The effect of laminin-1-doped nanoroughened implant surfaces: Gene expression and morphological evaluation

Aim. This study aimed to observe the morphological and molecular effect of laminin-1 doping to nanostructured implant surfaces in a rabbit model. Materials and Methods. Nanostructured implants were coated with laminin-1 (test; dilution, 100 g/mL) and inserted into the rabbit tibiae. Noncoated implants were used as controls. After 2 weeks of healing, the implants were removed and subjected to morphological analysis using scanning electron microscopy (SEM) and gene expression analysis using the real-time reverse transcriptase-polymerase chain reaction (RT-PCR). Results. SEM revealed bony tissue attachment for both control and test implants. Real-time RT-PCR analysis showed that the expression of osteoblast markers RUNX-2, osteocalcin, alkaline phosphatase, and collagen I was higher (1.62-fold, 1.53-fold, 1.97-fold, and 1.04-fold, resp.) for the implants modified by laminin-1 relative to the control. All osteoclast markers investigated in the study presented higher expression on the test implants than controls as follows: tartrate-resistant acid phosphatase (1.67-fold), calcitonin receptor (1.35-fold), and ATPase (1.25-fold). The test implants demonstrated higher expression of inflammatory markers interleukin-10 (1.53-fold) and tumour necrosis factor-α (1.61-fold) relative to controls. Conclusion. The protein-doped surface showed higher gene expression of typical genes involved in the osseointegration cascade than the control surface. © 2012 Humberto Osvaldo Schwartz-Filho et al.

Brachiaria spp. poisoning of ruminants in Brazil

Brachiaria spp. são as forrageiras mais importantes para a pecuária brasileira. Entretanto, um fator limitante para sua utilização é a sua toxicidade. A maioria dos surtos de fotossensibilização hepatógena é causada por Brachiaria decumbens; porém, B. brizantha, B. humidicola e B. ruziziensis podem também causar intoxicação. A intoxicação afeta bovinos, ovinos, caprinos e bubalinos. Os ovinos são mais susceptíveis que as outras espécies, e os animais jovens são mais susceptíveis que os adultos. Existem diferenças na susceptibilidade entre animais da mesma espécie e tem sido sugerido que esta resistência é genética. Sugere-se, também, que búfalos e provavelmente alguns ovinos são resilientes (quando intoxicados apresentam lesões histológicas e aumento das concentrações séricas de GGT, mas não apresentam sinais clínicos). Em geral, a concentração de saponinas é maior nas plantas em crescimento, mas surtos ocorrem durante todo o ano, provavelmente por aumento da concentração de saponinas na planta por alguma causa ainda desconhecida. Uma síndrome clínica com progressiva perda de peso e morte, sem fotossensibilização, tem sido descrita em bovinos intoxicados por B. decumbens. As principais medidas preventivas são baseadas na seleção de animais resistentes ou resilientes e o desenvolvimento de espécies ou variedades de Brachiaria com menores concentrações de saponinas.