Remote sensing detection of nutrient uptake in vineyards using narrow-band hyperspectral imagery

This manuscript delves further into the assessment of narrow-band vegetation indices derived from hyperspectral imagery acquired at 1 m spatial resolution with the Compact Airborne Spectrographic Imager (CASI). Narrow-band indices proposed in this study were assessed as indicators of biochemical and structural parameters in Vitis vinifera L., observing their relationships with foliar variables such as N, P, K, Ca, Fe, Mg and chlorophyll a+b concentration (Ca+b). Hyperspectral indices were assessed to study their capability for vegetation condition monitoring as a function of fertilization treatments applied (basically extracts of Ascophyllum nodosum seaweed and chelates), showing associations with field variables. Narrow-band vegetation indices displayed sensitivity to vineyard growth and condition as a function of seaweed fertilization and other supplementary mineral correctors, such as chelates. This work shows the interest of using new narrow-band hyperspectral remote sensing indices for vineyard monitoring due to their potential to indicate physiological condition.

The spine in Paget’s disease

Paget’s disease (PD) is a chronic metabolically active bone disease, characterized by a disturbance in bone modelling and remodelling due to an increase in osteoblastic and osteoclastic activity. The vertebra is the second most commonly affected site. This article reviews the various spinal pathomechanisms and osseous dynamics involved in producing the varied imaging appearances and their clinical relevance. Advanced imaging of osseous, articular and bone marrow manifestations of PD in all the vertebral components are presented. Pagetic changes often result in clinical symptoms including back pain, spinal stenosis and neural dysfunction. Various pathological complications due to PD involvement result in these clinical symptoms. Recognition of the imaging manifestations of spinal PD and the potential complications that cause the clinical symptoms enables accurate assessment of patients prior to appropriate management

Evaluation of the in vivo biocompatibility of hydroxyapatite granules incorporated with zinc ions

The incorporation of zinc onto biomaterials may improve their biological properties, since it is an essential trace element, involved on important steps of bone remodeling. The aim of this work was to evaluate the in vivo biocompatibility of previously characterized hydroxyapatite granules incorporated with 5% zinc (ZnHA), through a subcutaneous grafting test. Granules produced from powders of ZnHA or stoichiometric HA were subcutaneously grafted onto Balb/c mice, and histomorphometrical analysis was performed at 7, 14, 21, 28 or 60 days after grafting. HA and ZnHA induced a similar foreign body reaction, with formation of granulome and the presence of a fibrous capsule. Granulocytes were virtually absent, and agranulocytes decreased with time. ZnHA treated samples presented faster reduction on multinucleated giant cells and increase on observed angiogenesis, as compared to HA. It could be concluded that ZnHA granules are biocompatible. Further study should better address its potential use for bone therapy

Experimental proof-of-concept of heliosea: a novel marine floating photovoltaic device

Floating photovoltaic (FPV) plants have seen rapid growth during the last decade. Currently, the technological challenge lies in developing technology to transition from freshwater to the vast and untapped marine environment. This paper outlines the first experimental proof of concept of HelioSea, an innovative floating photovoltaic system. The device includes a pole-mounted solar platform with a double-axis tracker, supported by a tension-leg platform. A 1:30 scale model was tested at the wave basin of the University of Porto to assess its response to regular and irregular waves. In total, 27 regular wave tests were conducted to establish the Response Amplitude Operators (RAOs) of the structure. The device showed a low amplitude response in all degrees of freedom for T < 20 s, featuring surge responses of up to 4 m/m and yaw responses of up to 1 deg/m. The captured surge natural period aligned with initial estimations at T = 24 s. Additionally, short- and long-crested irregular wave tests were performed to confirm its response in more realistic scenarios. The resulting irregular motion transfer functions confirmed the stability of the proposed concept. Design considerations for the future developments of HelioSea are provided based on the insights gained from these tests

P122 Low Risk of new dysplastic lesions during inflammatory bowel disease surveillance with dye-cromoendoscopy: a multicenter population-based retrospective study

Abstract Background The 21st century has witnessed advances in endoscopic surveillance technology such as high-definition imaging and virtual or dye-based chromoendoscopy, which have led to increased detection of dysplasia. It is unknown the rates of new dysplastic lesions or cancer progression with these techniques though it seems lower than previously described. Methods We developed a multicenter, population-based and retrospective cohort from 7 Spanish hospitals from the Group of Inflammatory bowel disease of Castilla Y Leon (GEICYL) including sequentially all patients with inflammatory bowel disease and colonic dysplastic lesions completely resected (R0) in surveillance with dye-based indigo carmine chromoendoscopy between January 2013 and December 2019, with a minimum endoscopic follow-up of 12 months. The aim was to evaluate the risk of developing more advanced metachronous neoplasia during follow-up, analysing possible associated risk factors. Results A total of 99 patients and 148 index lesions (145 low-grade dysplasias [LGD] and 3 high-grade dysplasias [HGD]) with a medium follow-up of 48.76 months (IQR: 36.34 – 67.15) were included. Patients and IBD baseline characteristics are reflected in table 1. During follow-up, 37 patients developed 97 new dysplastic lesions (92 LGD, 4 HGD and 1 CRC) and 1 patient developed multifocal invisible dysplasia (3 HGD). The overall incidence rate for new dysplastic lesions was 0.23 per 100 patient-year, 1.15 per 100 patients at 5 years and 2.29 per 100 patients at 10 years (Figure 1). Personal history of dysplasia was associated with higher risk of developing any grade of dysplasia during follow-up (p 0.025), meanwhile, left colon lesions was associated with a lower risk (p 0.043). 6 patients developed more advanced lesions (5 patients HGD and 1 CCR) with an incidence rate at year and 10 years of 1% and 14% respectively; LGD lesion &amp;gt;1cm was a risk factor for developing HGD or CRC (p 0.041), meanwhile LGD lesion &amp;lt; 1 cm was a protective factor (p 0.013) (table 2,3). 1/8 patients (13%) with HGD lesions developed CRC during follow-up. 3 patients were colectomized (2 by HGD and 1 by CRC). Neither mesalamine treatment or immunosuppressive or biological treatment were associated with a lower risk of dysplasia development. Conclusion Risk of dysplasia progression to advanced neoplasia and specifically risk of new neoplastic lesions after endoscopic resection of colitis-associated dysplasia are very low in our cohort with dye-chromoendoscopy. Personal history of dysplasia, as risk factor, and left colon location, as protective factor, were associated with new dysplastic lesions. Finally, size above 1 cm was the only risk factor for progression to advanced lesions. </jats:sec