Teste de condutividade elétrica para avaliação da qualidade fisiológica de sementes Sebastiania commersoniana (Bail) Smith & Downs - Euphorbiaceae

O teste de condutividade elétrica tem sido excelente ferramenta para avaliar a qualidade de sementes de diversas espécies e, mais recentemente, estudos têm sido conduzidos visando verificar sua aplicabilidade em sementes florestais. Assim este trabalho objetivou estabelecer metodologia específica do teste de condutividade elétrica para sementes de branquilho. Foram usados três lotes de sementes resultantes do armazenamento em embalagens de vidro (Lote I), pano (Lote II) e papel (Lote III), em câmara fria (10ºC e 60% UR), por cinco meses, os quais foram submetidos ao teste de germinação, avaliando-se a porcentagem e o índice de velocidade de germinação. No teste de condutividade elétrica foram estudadas três quantidades de sementes por repetição (25, 50 e 75 sementes), três volumes de água deionizada (50, 75 e 100mL) e 11 tempos de embebição das sementes (2, 4, 6, 12, 18, 24, 30, 36, 42, 48 e 72h), a 25ºC. O lote I apresentou maior porcentagem e velocidade de germinação. O teste de condutividade elétrica possibilitou a mesma discriminação dos lotes que o teste de germinação, em combinações variadas dos fatores estudados. Foi possível separar o lote de melhor qualidade fisiológica (Lote I) dos demais lotes, já a partir de 2 horas de embebição, utilizando-se amostras de 75 sementes embebidas em 50, 75 ou 100mL de água; ou amostras de 50 sementes embebidas em 50mL de água, a partir de 18 horas de embebição. Desta forma, pode-se recomendar o uso de 75 sementes, embebidas em 75mL de água, por 24 horas à temperatura de 25ºC, para a condução do teste de condutividade elétrica.

Efeito da temperatura na germina̧ão de sementes de Sebastiania commersoniana (Baillon) Smith & Downs separadas pela colora̧ão do tegumento

Sebastiania commersoniana (Euphorbiaceae) is a tree species of riparian forests in Brazil. Seeds of this species released from mature fruits have heteromorphy in coat colour: dark (dark-brown to black), striated (dark with light-grey stria) and clear (light-grey to whitish). In this work two experiments were carried out in order to study the effect of temperature on seed germination in interaction with coat colour. Germination final percentage and speed index were evaluated. In the first experiment seeds of the three colours were submitted to constant (30°C) and alternating (20-35°C) temperatures. For all the seed colours, best results were obtained at alternating temperature. Physiological quality of striated seeds was greater than those clear seeds and dark seeds were intermediate. In the second experiment striated and clear seeds were submitted to three amplitudes of alternating temperature: 5°C (20-25°C and 25-30°C), 10°C (20-30°C and 25-35°C) and 15°C (20-35°C). Both germination percentage and speed were higher in striated seeds and for the two seed colours, best results were obtained at 20-30°C and 20-35°C. These temperatures are recommended for the germination test.

Qualidade fisiológica de sementes de Sebastiania commersoniana (Baill.) Smith & Downs (branquilho - Euphorbiaceae) durante o armazenamento

This paper aims to evaluate the physiological quality of Sebastiania commersoniana seeds stored in cloth bag, plastic bag and glass container and kept in two conditions: laboratory workbench and cold chamber (4 ± 2°C e 80% relative humidity - RH) for 531 days. Periodically, samples were taken in order to determine the moisture content and to perform germination tests. The experimental design was completely randomized, in factorial scheme of 3 × 2 (wrappings × conditions), for each period of storage evaluated (0, 158, 271, 389 and 531 days of storage). Supplementary, a polynomial regression was adjusted in order to describe the physiological quality of the seeds for the different conditions during the experimental period. The results lead to the following considerations: a) storage under variable temperature and air humidity (laboratory workbench) can be used for periods of over five and a half months, with the seeds stored in cloth bag, plastic bag or glass container; b) the physiological quality of the seeds was not hardly altered when stored in cold chamber in cloth bag, plastic bag and glass container for over 18 months.

Testes de vigor para avaliação da qualidade fisiológica de sementesde Sebastiania commersoniana (Baill.) Smith & Downs.

The objective of this work was to evaluate the efficiency of different vigor tests to assess S. commersoniana seeds physiological quality during storage. Therefore, seeds were stored in cloth bags, plastic bags and glass containers for 531 days, both at room temperature and in a cold chamber. Periodically samples were taken and the following tests were conducted: standard germination, germination speed index, first count after germination, seedlings fresh and dry matter, electrical conductivity (imbibitions for 2 and 24 hours) and accelerated aging, in order to monitoring the seeds physiologic quality. Data were submitted to polynomial regression analysis, for each of the combination of packaging/storage condition. The results obtained led to the following considerations: a) the speed germination index and the accelerated aging test permitted a good evaluation of the seed-lots quality; b) the first count of germination did not allow any prediction about seed lots vigor; c) seedling fresh and dry matter did not discriminate among seed lots; d) electrical conductivity test after 2 h imbibitions was not adequate to evaluate the seed lots vigor and e) the electric conductivity test with 24 h imbibitions was more adequate to differentiate among seed lots, but with little efficiency to discriminate among seed lots with intermediate vigor or with low quality differences.

Musculosidade e composição da perna de ovinos de diferentes genótipos e idades ao abate

Foram avaliadas as características morfológicas da carcaça, musculosidade e composição tecidual da perna de cordeiros criados em regime de pasto, provenientes de ovelhas Romney, acasaladas com três raças paternas (Romney, East Friesian x (Finn x Texel) e Finn x Poll Dorset). Aos 150 e 300 dias de idade, os cordeiros foram abatidos em dois lotes, cada um com 15 animais de cada raça paterna, num total de 90 animais. O grupo oriundo de animais East Friesian x (Finn x Texel) apresentou maior quantidade de músculo na perna (1.975 g) e, em comparação ao grupo Romney, semelhante musculosidade da perna (0,45) e maior relação músculo:osso (7x6,69). A musculosidade da perna nos animais descendentes de Finn x Poll Dorset foi menor (0,44), quando comparada à dos demais grupos. Cordeiros abatidos mais tardiamente apresentaram carcaças mais longas e magras, provavelmente pelas condições adversas do verão e do outono, em que são típicas a menor taxa de crescimento e a qualidade inferior de forragem. O genótipo e a idade de abate influem nas características morfológicas da carcaça, no índice de musculosidade e de composição tecidual da perna dos cordeiros.

Early cephalometric characteristics in Class III malocclusion

OBJECTIVE: Early identification of craniofacial morphological characteristics allows orthopedic segmented interventions to attenuate dentoskeletal discrepancies, which may be partially disguised by natural dental compensation. To investigate the morphological characteristics of Brazilian children with Class III malocclusion, in stages I and II of cervical vertebrae maturation and compare them with the characteristics of Class I control patients. METHODS: Pre-orthodontic treatment records of 20 patients with Class III malocclusion and 20 control Class I patients, matched by the same skeletal maturity index and sex, were selected. The craniofacial structures and their relationships were divided into different categories for analysis. Angular and linear measures were adopted from the analyses previously described by Downs, Jarabak, Jacobson and McNamara. The differences found between the groups of Class III patients and Class I control group, both subdivided according to the stage of cervical vertebrae maturation (I or II), were assessed by analysis of variance (ANOVA), complemented by Bonferroni's multiple mean comparisons test. RESULTS: The analysis of variance showed statistically significant differences in the different studied groups, between the mean values found for some angular (SNA, SNB, ANB) and linear variables (Co - Gn, N - Perp Pog, Go - Me, Wits, S - Go, Ar - Go). CONCLUSION: Assessed children displaying Class III malocclusion show normal anterior base of skull and maxilla, and anterior positioning of the mandible partially related to increased posterior facial height with consequent mandibular counterclockwise rotation.

Influence of Intensive Agriculture on Dry Deposition of Aerosol Nutrients

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Perfil da fluência em tarefa de narrativa oral em indivíduos com Síndrome de Down

Pós-graduação em Fonoaudiologia - FFC

A construção da imagem do imperador Augusto nas obras de Veléio Patérculo, Plutarco e Suetônio

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Ocorrência de microrganismos periodontopatogênicos e viruses herpéticos na cavidade bucal de pacientes portadores de Síndrome de Down

Pós-graduação em Ciência Odontólogica - FOA

Avaliação do complexo crânio-facial em indivíduos portadores de síndrome de down: um estudo radiográfico cefalométrico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização fisiológica e bioquímica da dominância apical em bananeira (Musa acuminata colla)

Pós-graduação em Agronomia (Horticultura) - FCA

Estudos latino-americanos em Oxford: notas sobre a universidade do Oxford colhidas durante a realizaçãode um seminário sobre o Brasil atual

Estas notas têm como intenção mais imediata divulgar as possibilidades de estudos no nível de pós-graduação e pós-doutorado em áreas ligadas às ciências sociais, à literatura e às humanidades de modo geral, na Universidade de Oxford, através do St. Antony's College, que é a sua Instituição especializada nesse tipo de estudos em relação a países de todo o mundo.

Linguagem narrativa e fluência na síndrome de down: uma revisão

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Intervenção em habilidades sociais com uma criança com síndrome de Down

Studies show that children with Down’s syndrome have deficits in social skills, which can interfere in their social interactions and also in their academic performance. The aim of this study was to analyze the clinical significance and reliable change in repertory of social skills of a child with Down’s syndrome, from interventions in the clinic, at home and at school. A seven year old girl with Down’s Syndrome who had frequented the first year of regular school, her parents and her teacher participated in this study. They were attending in a Center of Applied Psychology, of a public university in São Paulo State. Before and after the intervention parents and teacher answered the Rating System Social Skills (SSRS). The intervention with the child had been conducted for six months, through playful activities in weekly meetings. It was discussed various topics related to social skills with parents and teacher in biweekly and monthly meetings. The results were analyzed using JT method. With parents, comparing the two assessments conducted, the data pointed to positive change reliable for four of the six skills assessed. Of the five skills assessed by the teacher, one of them was not in the clinical level since the first application. The other two went from clinical to non-clinical level, featuring reliable positive change. The study showed the importance of pre and post measures in case study, enabling the assessment of the effects of the intervention performed on the various factors of social skills. Further studies with larger populations may ratify the data obtained.