Supercritical CO2 recovery of caffeine from green coffee oil: new experimental solubility data and modeling

The caffeine solubility in supercritical CO2 was studied by assessing the effects of pressure and temperature on the extraction of green coffee oil (GCO). The Peng-Robinson¹ equation of state was used to correlate the solubility of caffeine with a thermodynamic model and two mixing rules were evaluated: the classical mixing rule of van der Waals with two adjustable parameters (PR-VDW) and a density dependent one, proposed by Mohamed and Holder² with two (PR-MH, two parameters adjusted to the attractive term) and three (PR-MH3 two parameters adjusted to the attractive and one to the repulsive term) adjustable parameters. The best results were obtained with the mixing rule of Mohamed and Holder² with three parameters.

Is size structure a good measure of future trends of plant populations? an empirical approach using five woody species from the Cerrado (Brazilian savanna)

Size distributions in woody plant populations have been used to assess their regeneration status, assuming that size structures with reverse-J shapes represent stable populations. We present an empirical approach of this issue using five woody species from the Cerrado. Considering count data for all plants of these five species over a 12-year period, we analyzed size distribution by: a) plotting frequency distributions and their adjustment to the negative exponential curve and b) calculating the Gini coefficient. To look for a relationship between size structure and future trends, we considered the size structures from the first census year. We analyzed changes in number over time and performed a simple population viability analysis, which gives the mean population growth rate, its variance and the probability of extinction in a given time period. Frequency distributions and the Gini coefficient were not able to predict future trends in population numbers. We recommend that managers should not use measures of size structure as a basis for management decisions without applying more appropriate demographic studies.

Evaluation of the cytotoxic and genotoxic potential of water from the River Paraíba do Sul, in Brazil, with the Allium cepa L. test

This work investigated the cytotoxic and genotoxic potential of water from the River Paraíba do Sul (Brazil) using Allium cepa roots. An anatomo-morphological parameter (root length), mitotic indices, and frequency of micronuclei were analysed. Eight bulbs were chosen at random for treatment for 24 to 120 hours with the River water collected in the years of 2005 and 2006 from sites in the cities of Tremembé and Aparecida (São Paulo state, Brazil). Daily measurements of the length of the roots grown from each bulb were carried out throughout the experiment. Mitotic index (MI) and frequency of micronuclei (MN) were determined for 2000 cells per root, using 3-5 root tips from other bulbs (7-10). Only in the roots treated with samples of the River water collected in 2005 in Tremembé city was there a decrease in the root length growth compared to the respective control. However, a reduction in MI values was verified for both sites analysed for that year. Considering the data involving root length growth and especially MI values, a cytotoxic potential is suggested for the water of the River Paraíba do Sul at Tremembé and Aparecida, in the year of 2005. On the other hand, since in this year the MN frequency was not affected with the river water treatments, genotoxicity is not assumed for the river water sampled at the aforementioned places.

Período ovulatório e crises epilépticas

We prospectively follow up 80 mentally healthy women at menacme age, with chronic epilepsy and had had least one seizure in the month preceding the study. We selected 59 patients from whom we were able to observe at least three regular menstrual cycles with seizures. We defined regular, irregular cycle, perimenstrual and ovulation period. According to our concepts we have got 19, 30 and 6 patients with respectively severe, moderate and mild exacerbation of perimenstrual seizures. Using our definitions 6, 20 and 17 patients showed severe, moderate and mild accentuation of seizures during ovulation, while 15 patients showed no ovulatory accentuation. Our attention was drawn to the great number of perimenstrual and ovulatory exacerbation of seizures, according to our criteria. From 55 patients with perimenstrual accentuation of seizures 44 (74.54%) showed exacerbation during the ovulatory period. In our opinion, these data speak out in favor of the hormonal theory to explain these occurrences. We discuss these data based on the avaiable literature. We think the strogen peak is probably the main cause of the increased frequency of epileptic seizures during the ovulation period. New studies, documenting objectively the ovulation and seizures are mandatory to clarify the relationship of these aspects of the female endocrine reproductive physiology in epileptics.

Treinamento físico e fatores de risco cardiovascular em homens de meia-idade

Universidade Estadual de Campinas . Faculdade de Educação Física

Análise dos esforços de alta intensidade de jogadores de futebol profissional

Universidade Estadual de Campinas . Faculdade de Educação Física

Lesões esportivas em atletas com deficiencia visual

Universidade Estadual de Campinas . Faculdade de Educação Física

Metodos de avaliação em Educação Fisica no ensino fundamental

Universidade Estadual de Campinas . Faculdade de Educação Física

O papel da propriocepção no desenvolvimento da força muscular e da flexibilidade

Universidade Estadual de Campinas . Faculdade de Educação Física

Barreiras socio-culturais e lazer das pessoas portadoras de deficiencia fisica : um estudo do grupo Fraternidade Cristã de Doença e Deficiencia de Campinas, SP

Universidade Estadual de Campinas. Faculdade de Educação Física

Crescimento, composição corporal, desempenho motor de escolares de 07a 10 de idade do municipio de Cascavel-Parana

Universidade Estadual de Campinas. Faculdade de Educação Física

Avaliações autonômicas e cardiovasculares em pessoas com lesão da medula espinhal nas situações de repouso, em um teste de estresse mental e durante exercício físico

Universidade Estadual de Campinas . Faculdade de Educação Física

Análise do jogo de goalball : modelação e interpretação dos padrões de jogo da Paralimpíada de Pequim 2008

Universidade Estadual de Campinas . Faculdade de Educação Física

Análise quantitativa da distribuição de jogadores de futebol em campo durante jogos oficiais

Universidade Estadual de Campinas. Faculdade de Educação Física

Mensuração da potência mecânica em esforços de alta intensidade na condição laboratorial de corrida atada e na condição de campo em corrida semi-atada e livre

Universidade Estadual de Campinas . Faculdade de Educação Física