Métodos de identificação, calibração e avaliação de modelos aplicados à dinâmica de carbono do solo.

Práticas agrícolas conservacionistas podem potencializar a capacidade de armazenamento de carbono orgânico do solo (COS), mitigando as emissões de gases de efeito e aumentando a disponibilidade de nutrientes no solo, tornando-o mais fértil para o crescimento vegetal. Com isso, nota-se a importância do estudo acerca da quantidade de COS. O modelo Century [5] simula o ciclo biogeoquímico das plantas, que inclui a dinâmica de matéria orgânica do solo (ciclo de carbono e nutrientes), da água e das plantas.Trabalho apresentado no 41º Congresso Nacional de Matemática Aplicada e Computacional, 2022, Campinas (edição híbrida)

Prognostic factors affecting surgical outcome of gastrointestinal stromal tumours

Background/Aims: During the past decade, the development of mini-invasive surgery has determined a resurgence in popularity of the antireflux surgery. The purpose of this study is to examine indications, preoperative evaluation, surgical techniques, and outcomes after mini-invasive surgery. Methodology: From 1996 to 2000, 25 patients with gastroesophageal reflux disease associated to hiatal hernia underwent laparoscopic surgery. The indication for surgery was failure of long-term medical therapy. All patients had severe acid reflux on 24h-pH monitoring, endoscopic evidence of esophagitis, and defective lower esophageal sphincter. Nissen fundoplication was performed in 16 patients with normal esophageal body motility, and 270\ub0 posterior fundoplication in 9 patients with low esophageal motility. Results: Mortality and conversion rate were 0. Mean operative time was 130 minutes and mean postoperative hospital stay 5 days. Twenty-four (96%) patients were completely cured of reflux symptoms off all medications. Transient, mild postoperative dysphagia occurred in 3 patients (12%). There was a significant improvement of the results in postoperative esophageal manometry and 24h-pH monitoring. Conclusions: Despite the fact that few patients were treated by using laparoscopic approach, results are encouraging with less morbidity and great advantages for patients. Precise selection of patients and surgical techniques are essential