Ocular Ischaemia Due to a Spontaneous Carotid Artery Dissection

Internal carotid artery dissection (ICAD) is caused by the disruption of the tunica intima, with the formation of an intramural haematoma that can cause stenosis or occlusion of the artery's lumen, leading to reduced blood flow and secondary thrombus formation. Up to two-thirds of patients with ICAD show ophthalmological symptoms or signs, which are, frequently, the first manifestations of this clinical condition, often preceding for weeks the neurological signs of cerebral infarction. Central retinal artery occlusion (CRAO) is a rare complication of ICAD, secondary either to haemodynamic compromise, with ocular hypoperfusion and reverse flow within the ophthalmic artery, or to thromboembolic events, in rarer cases. We report a case of CRAO secondary to a spontaneous ICAD, in an otherwise healthy middle-aged patient.info:eu-repo/semantics/publishedVersio

Sementes sintéticas: Tecnologia para viabilizar a conservação in vitro da Batata.

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Comparação de métodos de extração da solução do solo realizadas no Laboratório de Solos da EMPARN no Rio Grande do Norte.

O conhecimento da composição iônica da solução do solo é de grande importância para o monitoramento da disponibilidade de nutrientes e manejo da adubação para as culturas agrícolas e florestais, bem como para investigações de contaminação ambiental. Desta maneira, várias metodologias que estimem a composição iônica desta solução são utilizadas e bem aceitas na literatura. Este trabalho teve como objetivo, avaliar aleatoriamente o desempenho de dois métodos de extração e avaliação da solução do solo (Pasta de Saturação e Relação Solo:Água) praticados no Laboratório de Água, Solo e Planta da Empresa de Pesquisa Agropecuária do Rio Grande do Norte – EMPARN e verificar se as metodologias tem entre si correlações aceitáveis para uso pelos diversos clientes deste laboratório

Síntese do levantamento de reconhecimento de baixa e média intensidade dos solos da Folha Cedro (Escala 1:100.000)

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Síntese do levantamento de reconhecimento de baixa e média intensidade dos solos da Folha Jardim (Escala 1:100.000)

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The introduced tree Prosopis juliflora is a serious threat to native species of the Brazilian Caatinga vegetation.

Despite its economic importance in the rural context, the Prosopis juliflora tree species has already invaded millions of hectares globally (particularly rangelands), threatening native biodiversity and rural sustainability. Here we examine seedling growth (leaf area, stem diameter, plant height) and seedling mortality across five native plant species of the Caatinga vegetation in response to competition with P. juliflora. Two sowing treatments with 10 replications were adopted within a factorial 2 × 5 randomized block design. Treatments consisted of P. juliflora seeds sowed with seeds of Caesalpinia ferrea, Caesalpinia microphylla, Erythrina velutina, Mimosa bimucronata and Mimosa tenuiflora (one single native species per treatment), while seeds of native species sowed without P. juliflora were adopted as controls. Overall, our results suggest that P. juliflora can reduce seedling growth by half and cause increased seedlingmortality amongwoody plant species.Moreover, native species exhibit different levels of susceptibility to competitionwith P. juliflora, particularly in terms of plant growth. Such a superior competitive ability apparently permits P. juliflora to establishmonospecific stands of adult trees, locally displacing native species or limiting their recruitment. The use of less sensitive species, such as C. ferrea and M. tenuiflora, to restore native vegetation before intensive colonization by P. juliflora should be investigated as an effective approach for avoiding its continuous spread across the Caatinga region