ANÁLISE DOS PROCESSOS MORFODINÂMICOS NA BACIA HIDROGRÁFICA DO RIO ANINGAS – PIRAMBU/SE

Este artigo apresenta resultados de estudos realizados na bacia do rio Aningas, no município de Pirambu/SE e objetiva analisar a atuação dos processos morfodinâmicos a partir dos pressupostos holístico-sistêmicos, com a identificação de áreas vulneráveis à erosão. A análise permitiu constatar que os processos são comandados principalmente pela ação das águas pluviais e fluviais, condicionados pelas características da topografia, das formações superficiais e da sazonalidade climática

Usefulness of a rapid immunometric assay for intraoperative parathyroid hormone measurements

Intraoperative parathyroid hormone (IO-PTH) measurements have been proposed to improve operative success rates in primary, secondary and tertiary hyperparathyroidism (PHP, SHP and THP). Thirty-one patients requiring parathyroidectomy were evaluated retrospectively from June 2000 to January 2002. Sixteen had PHP, 7 SHP and 8 THP. Serum samples were taken at times 0 (before resection), 10, 20 and 30 min after resection of each abnormal parathyroid gland. Samples from 28 patients were frozen at -70ºC for subsequent tests, whereas samples from three patients were tested while surgery was being performed. IO-PTH was measured using the Elecsys immunochemiluminometric assay (Roche, Mannheim, Germany). The time necessary to perform the assay was 9 min. All samples had a second measurement taken by a conventional immunofluorimetric method. We considered as cured patients who presented normocalcemia in PHP and THP, and normal levels of PTH in SHP one month after surgery and who remained in this condition throughout the follow-up of 1 to 20 months. When rapid PTH assay was compared with a routine immunofluorimetric assay, excellent correlation was observed (r = 0.959, P < 0.0001). IO-PTH measurement showed a rapid average decline of 78.8% in PTH 10 min after adenoma resection in PHP and all patients were cured. SHP patients had an average IO-PTH decrease of 89% 30 min after total parathyroidectomy and cure was observed in 85.7%. THP showed an average IO-PTH decrease of 91.9%, and cure was obtained in 87.5% of patients. IO-PTH can be a useful tool that might improve the rate of successful treatment of PHP, SHP and THP.Universidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Disciplina de EndocrinologiaUniversidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Disciplina de NefrologiaUniversidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Disciplina de Cirurgia de Cabeça e PescoçoUNIFESP, EPM, Disciplina de EndocrinologiaUNIFESP, EPM, Disciplina de NefrologiaUNIFESP, EPM, Disciplina de Cirurgia de Cabeça e PescoçoSciEL

Queueing systems with different types of renovation mechanism and thresholds as the mathematical models of active queue management mechanism

This article is devoted to some aspects of using the renovation mechanism (different types of renovation are considered, definitions and brief overview are also given) with one or several thresholds as the mathematical models of active queue management mechanisms. The attention is paid to the queuing systems in which a threshold mechanism with renovation is implemented. This mechanism allows to adjust the number of packets in the system by dropping (resetting) them from the queue depending on the ratio of a certain control parameter with specified thresholds at the moment of the end of service on the device (server) (in contrast to standard RED-like algorithms, when a possible drop of a packet occurs at the time of arrivals of next packets in the system). The models with one, two and three thresholds with different types of renovation are under consideration. It is worth noting that the thresholds determine not only from which place in the buffer the packets are dropped, but also to which the reset of packets occurs. For some of the models certain analytical and numerical results are obtained (the references are given), some of them are only under investigation, so only the mathematical model and current results may be considered. Some results of comparing classic RED algorithm with renovation mechanism are presented.Работа посвящена некоторым аспектам использования механизма обновления (различные варианты обновления рассмотрены, определения и краткий обзор представлены) с одним или несколькими порогами в качестве математических моделей механизмов активного управления очередями. Описаны системы массового обслуживания, в которых реализован механизм обновления с порогами, позволяющий управлять числом заявок в системе путем их сброса из накопителя в зависимости от значения некоторого управляющего параметра и пороговых значений. Сброс заявок из накопителя происходит в момент окончания обслуживания заявки на приборе, что отличает данный механизм сброса от RED-подобных алгоритмов, для которых сброс возможен в момент поступления в систему. Представлены модели с одним, двумя или тремя порогами. В этих моделях пороговые значения определяют не только место, с которого в накопителе начинается сброс заявок, но и до какой позиции заявки могут быть сброшены. Для некоторых из описываемых моделей уже получены аналитические и численные результаты (ссылки на работы представлены), но большая часть моделей находится в процессе изучения, поэтому представлены только описания и некоторые текущие данные. Приведены некоторые результаты сравнения классического алгоритма RED с механизмом обновления

Efeitos dos excessos de alumínio, cloro e manganês em dois cultivares de soja (Glycine max (L.) Merrill)

Two soybean cultivars, Santa Rosa and FV-1, were grown in nutrient solution in the presence of high concentrations of Al (24 ppm), CI (1750 ppm) and Mn (25 ppm). Observations, measurements and chemical analyses allowed for the following conclusions to be drawn: (1) symptoms of toxicity are in agreement with those described in the literatura; (2) the detrimental effect obeyed the decreasing order - Mn Al CI; (3) dry matter production by the variety UFV - 1 was relatively more affected by the treatments; (4) leaf analyses do not provide a reliable indication of the sensitivity of the two varieties to the high levels of the three elements in the substrate; (5) Ca/Al ratio in the roots keeps a good relationship with the relative tolerance of the two cultivas to excess Al in the medium.Dois cultivares de soja, Santa Rosa e UFV-1, foram cultivados em solução nutritiva na presença de excesso de alumínio, cloro e manganês. Além de provocar o aparecimento de sintomas foliares (cloro e manganês) ou radiculares (alumínio), os elementos em excesso causaram diminuições no crescimento e impediram a produção de vagens. A análise mineral das folhas mostrou a influência dos tratamentos na composição do tecido

Macromineral balance in lambs fed diets containing spineless cactus species

ABSTRACT The purpose of the present study was to evaluate the effects of spineless cactus species in diets of feedlot lambs on intake, apparent absorption and retention of macrominerals. Thirty-six uncastrated male Santa Inês lambs presenting an average body weight of 22.0±2.87 kg were distributed in a completely randomized design with three treatments [diet containing Tifton-85 hay as exclusive roughage (control), Miúda cactus cladodes-based diet or Orelha de Elefante Mexicana (OEM) cactus cladodes-based diet] and twelve replicates. The calcium (Ca) and magnesium (Mg) intakes (from feed and total) were higher (P=0.001) for animals fed diets supplemented with Miúda spineless cactus. The spineless cactus, regardless of species, caused a mean decrease of 45.4% in sodium intake (P=0.001). There was a net loss of Ca by lambs fed OEM spineless cactus (P=0.001). The absorption and retention of P was higher in control diet compared to the OEM diet (P<0.05). The amount apparently absorbed, and body retention of Mg were higher for lambs fed Miúda spineless cactus-diet (P=0.001). Therefore, the diet containing Miúda spineless cactus increases the intake and body retention of Ca and Mg in lambs. However, the use of OEM spineless cactus may be unsuitable for a long-term