Modelagem da curva de retenção de água de Latossolos utilizando a Equação Duplo Van Genuchten

Os Latossolos da região do Cerrado brasileiro, em função da mineralogia da fração argila e estrutura granular, apresentam elevado volume de poros grandes e de poros extremamente pequenos, não mostrando significativo volume de poros intermediários, o que faz com que neles a disponibilidade de água para as plantas seja baixa. Este trabalho objetivou caracterizar e modelar o comportamento da retenção de água em Latossolos oxídicos da região do Cerrado, pertencentes a diferentes classes texturais. Foram coletadas amostras do horizonte Bw de 10 Latossolos oxídicos sob vegetação nativa. A retenção de água nos potenciais matriciais de 1, 2, 4, 6, 8 e 10 kPa foi obtida em unidade de sucção nos potenciais de 33, 60, 100, 500 e 1.500 kPa no extrator de Richards, e a água retida sob potenciais de 1.500 a 300.000 kPa foi quantificada utilizando o psicrômetro de termopar WP4-T. O modelo duplo van Genuchten foi proposto para ajustar os dados experimentais de retenção de água por meio de procedimentos de ajuste de modelos não lineares do software R 2.10.1; também foi avaliada a relação entre as estimativas dos parâmetros do modelo, bem como a inclinação do ponto de inflexão com as propriedades texturais dos solos, aplicando o teste de correlação de Pearson. Os resultados mostraram o bom ajuste do modelo e alto poder de predição, sendo observada correlação do conteúdo de argila do solo com os parâmetros da equação (Usat, Upmp, Ures), assim como, com a inclinação do segundo ponto de inflexão (Itex). A textura dos Latossolos influenciou o comportamento das curvas de retenção de água. As curvas de retenção de água dos Latossolos em estudo apresentaram comportamento bimodal no intervalo de potencial matricial estudado.

Understanding Van Gogh's Night: bipolar disorder

Vincent Van Gogh (1853-1890) imparted in his art a deep essence of life, and in such a unique way that many would say it is possible to experience it vicariously by looking at his paintings even once. In 10 years, while exerting mental and physical efforts that may well have contributed to his premature death, he produced an impressive number of masterpieces. However, the specific neurological disorder Van Gogh suffered and how this may have influenced his art is still not clear. The combination of his eccentric personality, irascible temper, unstable moods and prolific creativity, makes the understanding of his illness a very complex endeavor and therefore poses a great challenge to those who investigate the relationships between the 'artistic mind', the brain and illness. In fact, most of the diagnoses (nearly 30) proposed for Van Gogh, during the last century, are not based on medical evidence but are ascertainable from analyses of his paintings and biographical data. Although no definitive diagnosis can be made based on such evidence, we conclude that according to DSM-IV criteria and findings extrapolated from his letters, Van Gogh is most likely to have suffered a bipolar disorder, affective or schizoaffective, which caused his death by suicide.

[Illustrations de Oeuvres] / Chéron, dess. ; Vertue, dess. Van der Gucht, C. du Bosc et P. Fourdrinier, grav. ; Jean Racine, aut. du texte

Comprend : [Tome I. Bandeau à la Dédicace : lion et licorne entourant les armoiries et la devise du Duc de Glocester.] Honi soit qui mal y pense. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome I. Pl. en reg. folio B : la Thébaïde ou les frères ennemis. Tragédie.] Thébaïde. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome I. Pl. en reg. du titre de la tragédie Alexandre le grand :] Alexandre. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome I. Pl. en reg. du titre de la tragédie Andromaque :] Andromaque. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome I. Pl. en reg. du titre de la tragédie Britannicus :] Britannicus. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome I. Pl. en reg. du titre de la tragédie Berenice :] Berenice. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome I. Pl. en reg. du titre de la comédie Les Plaideurs :] Les Plaideurs. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Frontispice :] [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Pl. en reg. du titre de la tragédie Bajazet :] Bajazet. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Pl. en reg. du titre de la tragédie Mithridate :] Mithridate. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Pl. en reg. du titre de la tragédie Iphigénie :] Iphigénie. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Pl. en reg. du titre de la tragédie Phèdre :] Phèdre. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Pl. en reg. du titre de la tragédie Esther :] Esther. [Cote : Yf 404-405/Microfilm R 122414] ; [Tome II. Pl. en reg. du titre de la tragédie Athalie :] Athalie. [Cote : Yf 404-405/Microfilm R 122414]

Endocytic and secretory traffic in Arabidopsis merge in the trans-Golgi network/early endosome, an independent and highly dynamic organelle.

Plants constantly adjust their repertoire of plasma membrane proteins that mediates transduction of environmental and developmental signals as well as transport of ions, nutrients, and hormones. The importance of regulated secretory and endocytic trafficking is becoming increasingly clear; however, our knowledge of the compartments and molecular machinery involved is still fragmentary. We used immunogold electron microscopy and confocal laser scanning microscopy to trace the route of cargo molecules, including the BRASSINOSTEROID INSENSITIVE1 receptor and the REQUIRES HIGH BORON1 boron exporter, throughout the plant endomembrane system. Our results provide evidence that both endocytic and secretory cargo pass through the trans-Golgi network/early endosome (TGN/EE) and demonstrate that cargo in late endosomes/multivesicular bodies is destined for vacuolar degradation. Moreover, using spinning disc microscopy, we show that TGN/EEs move independently and are only transiently associated with an individual Golgi stack.