Composition and quality of harvest residues and soil organic matter under windrow residue management in young hoop pine plantations as revealed by solid-state C-13 NMR spectroscopy

Solid-state C-13 nuclear magnetic resonance (NMR) with cross-polarisation (CP) and magic-angle-spinning (MAS) was used to: (a) examine the changes in carbon (C) composition of windrowed harvest residues during the first 3 years of hoop pine plantations in subtropical Australia; (b) assess the impacts of windrowed harvest residues on soil organic matter (SOM) composition and quality in the 0-10 cm soil layer. Harvest residues were collected from 0-, 1-, 2- and 3-year-old windrows of ca. 2.5 m width (15 m apart for 0-, 1- and 2-year-old sites and 10 m apart for 3-year-old site). Soils from the 0 to 10 cm soil layer were collected from the 1-, 2- and 3-year-old sites. The 13C NMR spectra of the harvest residues indicated the presence of lignin in the hoop pine wood, foliage and newly incorporated organic matter (NIOM). Condensed tannin structures were found in the decay-resistant bark, small wood and foliage, but were absent in other residue components and SOM. The NMR spectra of small wood samples contained condensed tannin structures because the outer layer of bark was not removed. NIOM showed a shift from foliage-like structures (celluloses) to lignin-type structures, indicating an incorporation of woody residues from the decomposing harvest residues. Suberins were also present in the small wood, foliage and bark. The 13C CP NMR spectra of SOM indicated that in areas where windrows were present, SOM did not show compositional changes. However, an increase in SOM quality under the windrows in the second year after their formation as characterised by the alkyl C/O-alkyl C (A/O-A) ratio was mainly due to inputs from the decomposition of the labile, readily available components of the windrowed harvest residues. (C) 2002 Published by Elsevier Science B.V.

Life transitions and changing physical activity patterns in young women

Background: Physical activity (PA) patterns are likely to change in young adulthood in line with changes in lifestyle that occur in the transition from adolescence to adulthood. The aim of this study was to ascertain whether key life events experienced by young women in their early twenties are associated with increasing levels of inactivity. Methods: This was a 4-year follow-up of 7281 participants (aged 18 to 23 years at baseline) in the Australian Longitudinal Study of Women's Health, with self-reported measures of PA, life events, body mass index (BMI), and sociodemographic variables. Results: The cross-sectional data indicated no change in PA between baseline (57% active) and follow-up (56% active). However, for almost 40% of the sample, PA category changed between baseline and follow-up, with approximately 20% of the women changing from being active to inactive, and another 20% changing from being inactive to active. After adjustment for age, other sociodemographic variables, BMI, and PA at baseline, women who reported getting married, having a first or subsequent child, or beginning paid work were more likely to be inactive at follow-up than those who did not report these events. Conclusions: The results suggest that life events such as getting married, having children, and starting work are associated with decreased levels of PA in young adult women. Strategies are needed to promote maintenance of activity at the time when most women experience these key life-stage transitions.

Environmental conditions and variation in levels of sun exposure among children in child care

Sun exposure in childhood is I of the risk factors for developing skin cancer, yet little is known about levels of exposure at this age. This is particularly important in countries with high levels of ultraviolet radiation. (UVR) such as Australia. Among 49 children 3 to 5 years of age attending child care centers, UVR exposure was studied under 4 conditions in a repeated measures design; sunny days, cloudy days, teacher's instruction to stay in the shade, and a health professionals instruction to apply sunscreen. Three different data collection methods were employed: (a) completion of questionnaire or diary by parents and researcher, (b) polysulphone dosimeter readings, and (c) observational audits (video recording). Results of this study indicated that more than half the children had been sunburnt (pink or red) and more than a third had experienced painful sunburn (sore or tender) in the last summer. Most wore short sleeve shirts, short skirts or shorts and cap, that do not provide optimal levels of skin protection. However, sunscreen was applied to all exposed parts before the children went out to the playground. Over the period of I hr (9-10 a.m.) the average amount of time children spent in full sun was 22 min. On sunny days there was more variation across children in the amount of sun exposure received. While the potential amount of UVR exposure for young children during the hour they were outside on a sunny day was 1.45 MED (Minimum Erythemal Dose), they received on average 0.35 MED, which is an insufficient amount to result in an erythemal response on fair skin even without the use of sunscreen.

Reliability of moderate-intensity and vigorous physical activity stage of change measures for young adults

Background. The purpose of this study was to examine the reliability of stage of change (SOC) measures for moderate-intensity and vigorous physical activity in two separate samples of young adults. Staging measures have focused on vigorous exercise, but current public health guidelines emphasize moderate-intensity activity. Method. For college students in the USA (n = 105) and in Australia (n = 123), SOC was assessed separately on two occasions for moderate-intensity activity and for vigorous activity. Test-retest repeatability was determined, using Cohen's kappa coefficient. Results. In both samples, the reliability scores for the moderate-intensity physical activity staging measure were lower than the scores for the vigorous exercise staging measure. Weighted kappa values for the moderate-intensity staging measure were in the fair to good range for both studies (0.50 and 0.45); for the vigorous staging measure kappa values were excellent and fair to good (0.76 and 0.72). Conclusions. There is a need to standardize and improve methods for staging moderate-intensity activity, given that such measures are used in public health interventions targeting HEPA (health-enhancing physical activity). (C) 2003 American Health Foundation and Elsevier Science (USA). All rights reserved.

Normal values for pelvic organ descent in health nulligravid young caucasian women

Translabial ultrasound is increasingly being used for the assessment of women presenting with pelvic floor dysfunction and incontinence (1,2). However, there is little information on normal values for bladder neck descent, with the two available studies disagreeing widely (3,4). No data has so far been published on mobility of the central and posterior compartment which can now also be assessed by ultrasound (5). This study presents normal values for urethral, bladder, cervical and rectal mobility in a cohort of young, stress continent, nulliparous nonpregnant women. Methods 118 nonpregnant nulliparous Caucasian women between 18 and 23 years of age were recruited for an ongoing twin study of pelvic floor function. Translabial ultrasound assessment of pelvic organ mobility was undertaken supine and after bladder emptying (6,7). The best of at least three effective Valsalva manoeuvres was used for evaluation, with no attempts at standardization of Valsalva pressure. Parameters of anterior compartment mobility were obtained by the use of on-screen calipers; cervical and rectal descent were evaluated on printouts. All examinations were carried out under direct supervision of the first author or by personnel trained by him for at least 100 consecutive assessments. Results The median age of participants in this study was 20 (range 18- 23). Mean body mass index was 23 (range 16.9- 36.7). Of 118 women, 2 were completely unable to perform a Valsalva manoeuvre despite repeated efforts at teaching and were excluded from analysis, as were ten women who complained of urinary stress incontinence, leaving 106 datasets. Average measurements for the parameters ‘retrovesical angle at rest’ (RVA-R) and on Valsalva (RVA-S), urethral rotation, bladder neck mobility, cysto-cele descent, cervical descent and descent of the rectal ampulla are given in Table 1.

ASD explained for peers, parents, and professionals

Can the parent of a child with autism or Asperger Syndrome ever really comprehend the experiences of their child? As a greater number of cases are identified and more is understood about these conditions, autism and Asperger Syndrome seem to be increasingly commonly understood terms. Despite the clear definitions provided by diagnostic criteria for the conditions (e.g., American Psychiatric Association [APA], 1994), it often remains difficult for professionals, parents and other carers, particularly those who are newcomers to this field, to truly understand the complexities of these conditions with respect to the day-to-day influences upon the affected individual.

Representação e compreensão dos adultos sobre o sistema jurídico

Na sociedade atual é comum que os indivíduos sejam testemunhas em tribunal, por isso é necessário perceber se são capazes de compreender os termos legais usados frequentemente no sistema jurídico mas também perceber qual a representação social que possuem acerca da justiça. Contudo, investigada a compreensão da terminologia legal desde a década de 50, afirma-se que os indivíduos de todas as faixas etárias não conseguem compreender e definir adequadamente, mas, também os estudos da representação social da justiça, demonstram uma diversidade de representatividade por parte dos indivíduos, de acordo com os seus diferentes contextos sociais, as informações recebidas dos meios de comunicação, os seus ambientes familiares e, as diferentes relações estabelecidas com o objeto. Esta dissertação tem assim como objetivo geral saber a representação que os adultos têm sobre a justiça e qual o conhecimento que têm dela a partir das definições de um conjunto de termos legais usados frequentemente no sistema jurídico. Para isso realizaram-se entrevistas de resposta aberta com 40 adultos de ambos os sexos, com idade compreendida entre 19 e 72 anos, sendo estes progenitores, representantes legais ou detentores da guarda de facto de crianças e jovens sinalizados na Comissão de Proteção de Crianças e Jovens. O estudo é uma investigação qualitativa e engloba um estudo descrito. Este estudo demonstrou que os adultos não conseguem definir adequadamente todos os termos legais propostos, pelo que não possuem uma representação clara de justiça e dos seus intervenientes.

Characterization and Evaluation of young ring hockey team

Ring hockey is a complex team sport with physical tecnical and tactical high demans (Manaças, 1988; Rodriguez, 1991). In teh absence of a battery of specific tests we proceed to the aplication of the 20 meters shuttle run test (Luc Leger, 1982) in youthfuk athletes of the juveniles.

Relationship between antropometric, corporal composition and performance in young swimmers, boys and girls

The young athlete is physiologically unique from the adult and must be considered differently. The growth and development of their bones, muscles, nerves, and organs largely dictate their physiological and performance capacities (Bar–Or, 1983; Costill & Wilmore, 1994; Stager et al., 2008). Swimming performance, and the required times to reach a competition (TAC), shoud look for those diferences and should be compatibles with them.

Cursing the Parents, Cursing the Past

Não se avança amaldiçoando o passado! Gastam-se muitas energias em atribuir a responsabolidade dos infortúnios das nossas incompetências aos antepassados e aos políticos do passado. Nota-se isto até hoje em Goa e em Portugal. As democracias e a tolerância política são ainda muito jovens! Em Santa Comba Dão há quem admire o seu "filho" Salazar, e isto causa muita irritação nos pretensos defensores da liberdade política! Em Goa, um delegado da Fundação Oriente diz numa entrevista que os protestos de uns 70 "ex-combatentes" da liberdade não contam muito. Esquece-se que na democracia eleitoral até 1 voto conta! São reacções sintomáticas de democracia ainda mal digerida.

Motivação e percepção do envolvimento parental na prática desportiva de jovens nadadores

RESUMO: O envolvimento parental no desporto é determinante no processo de formação desportiva dos jovens desportistas. Pelo facto de existirem poucos instrumentos de avaliação neste assunto, a adaptação e validação do Parental Involvement Sport Questionnaire (PISQ) para o idioma Português, tornou-se fundamental para colmatar esta lacuna. Assim, o presente estudo pretende alcançar dois objectivos principais: a) traduzir e adaptar o PISQ ao idioma Português do Brasil e, deste modo, iniciar o processo de validação do referido instrumento; b) analisar a relação entre a percepção dos jovens sobre o envolvimento parental na sua prática de natação e a motivação destes jovens nadadores. Um total de 114 nadadores participaram deste estudo, com idades compreendidas entre os 12 e 20 anos [ M = 14.67; DP = 8.29], para aferir utilizamos a versão Portuguesa do PISQ e do Sport Motivation Scale (SMS). Como principais resultados, a versão portuguesa do PISQ apresentou um Alpha de Cronbach deos comportamentos directivos dos pais mostraram reduzir a motivação intrínsica – saber, a motivação intrínsica pela prática e a motivação extrínsica – introjectada, e aumentar a amotivação dos jovens desportistas. ABSTRACT: The parental involvement in sport is crucial in the process of sports training of young athletes and, because there are few instruments for assessing this issue, the adaptation and validation of the Parental Involvement Sport Questionnaire (PISQ) for the Portuguese language, it became essential to bridge this gap. Thus, this study aims to achieve two main objectives: a) translate and adapt the PISQ to the Portuguese language of Brazil and thus begin the process of validation of that instrument, b) analyze the relationship between the perception of young people about the involvement parental in their practice of swimming, and the motivation of these young swimmers. A total of 114 swimmers participated in this study, aged between 12 and 20 years [M = 14.67, SD = 8.29], we used to measure the Portuguese version of PISQ and the Sport Motivation Scale (SMS). As main results, the Portuguese version of PISQ showed a Cronbach’s Alpha of , directive behaviors of the parents shown to reduce intrinsic and extrinsic motivation, and increase the amotivation of the young athletes.

Shiftworking families: parents' working schedule and sleep patterns of adolescents attending school in two shifts

OBJECTIVE: To explore whether parents' engagement in shift work affects the sleep habits of their adolescent children who attend school in two shifts. METHODS: The data were drawn from an extensive survey of sleep and daytime functioning of adolescents attending school one week in the morning and the other in the afternoon. The participants were 1,386 elementary and high school students (11-18 years old) whose parents were both employed. The data were analyzed using MANOVA, with parents' work schedule, adolescents' gender and type of school as between-subject factors. RESULTS: Parents' working schedule significantly affected the sleep patterns of high school adolescents. When attending school in the morning, adolescents whose parents were both day workers woke up somewhat later than adolescents with one shiftworking parent. In addition, they slept longer than adolescents whose parents were both shift workers. On weekends, adolescents whose parents both worked during the day went to bed earlier than adolescents whose parents were both shiftworkers. They also had smaller bedtime delay on weekends with respect to both morning and afternoon shifts than adolescents for whom one or both parents worked shifts. A significant interaction between parents' working schedule, adolescents' gender and type of school was found for sleep extension on weekends after afternoon shift school. CONCLUSIONS: Parental involvement in shift work has negative effects on the sleep of high school adolescents. It contributes to earlier wake-up time and shorter sleep in a week when adolescents attend school in the morning, as well as to greater bedtime irregularity.