169,813 research outputs found
Control of postharvest diseases caused by Penicillium spp. with myrtle leaf phenolic extracts: in vitro and in vivo study on mandarin fruit during storage
No full textBACKGROUND: In the postharvest handling of horticultural commodities, plant extracts with fungicidal activity are a valid alternative to synthetic fungicides. The fungicidal activity of myrtle leaf extracts from eight cultivars was studied in vitro against Penicillium digitatum, Penicillium italicum, and Penicillium expansum and on artificially inoculated mandarins with green and blue molds during storage for 12 days at 20 °C and 90% RH. RESULTS: Hydroxybenzoic acids, hydrolysable tannins, and flavonols were identified by high-performance liquid chromatography (HPLC). Despite sharing the same phenolic profile, extracts of eight myrtle cultivars significantly differed in the concentration of phenolics. Hydrolysable tannins are the principal subclass representing nearly 44.9% of the total polyphenols, whereas myricitrin was the most abundant flavonol in all cultivars. Myrtle extracts strongly inhibited conidial germination of the pathogens tested, although the greatest efficacy was observed against P. digitatum. At a concentration of 20 g L−1, all the extracts completely inhibited fungi growth; only ‘Angela’, ‘Tonina’ and ‘Grazia’ extracts were effective at lower concentrations (15 g L−1). On inoculated fruit, myrtle extracts significantly controlled rot development. As a preventive treatment, ‘Ilaria’ and ‘Maria Rita’ extracts significantly reduced the rate of fruit with green mold decay lesions. When applied as a curative treatment, all the exacts decreased the incidence of decay. Against P. italicum, all the extracts applied as preventive treatments controlled decay effectively, while as curative treatment some of the extracts were not effective. All the extracts reduced the size of the infected areas. CONCLUSION: The results propose myrtle extracts as a possible natural alternative to synthetic fungicides. © 2021 Society of Chemical Industry
EFFECT OF MAILLARD REACTION-PRODUCTS ON THE GROWTH OF SELECTED FOOD-POISONING MICROORGANISMS
No full textSerotonin and acetylcholine release response in the rat hippocampus during a spatial memory task
No full textNegative bone scintigraphy in wild-type transthyretin cardiac amyloidosis
No full textBackground: Amyloidosis is a rare systemic disease due to the extracellular tissue deposition of a fibrillar-shaped misfolded protein, called amyloid. Only two types of proteins commonly affect the heart leading to an infiltrative cardiomyopathy: immunoglobulin light chain and transthyretin (TTR) cardiac amyloidosis (CA). Despite the promising role of emerging imaging modalities, such as strain echocardiography, cardiac magnetic resonance and bone scintigraphy, its diagnosis is still often missed or delayed due to their inherent limitations and to a nonspecific clinical scenario with frequent concomitance of cardiac comorbidities. The gold standard for a definite diagnosis still remains endomyocardial biopsy, but in rare cases Congo Red staining could provide false negative results, as in our case, requiring immunoelectron microscopy. Case presentation: A middle-aged male adult presented to the emergency department for relapse of heart failure. Echocardiography and cardiac magnetic resonance, along with the history of bilateral carpal tunnel syndrome, were suspicious for TTR-CA. The diagnosis, however, was hampered by concomitant cardiac comorbidities and conflicting results of imaging modalities. In fact bone scintigraphy was negative, as well as Congo Red Staining on myocardial tissue samples obtained by endomyocardial biopsy. Given the high clinical suspicion, immunoelectron microscopy was performed, showing TTR amyloid fibrils deposits, that confirmed the diagnosis. A genetic analysis excluded and hereditary form. The patient was then referred to a specialist center for specific treatment. Conclusions: This is a rare case of a TTR-CA with a negative Bone Scintigraphy and Congo red staining, which demonstrated that CA is frequently misdiagnosed because of the low specific clinical manifestations and the results of imaging modalities that sometimes could be misleading, with subsequent delayed diagnosis and correct treatment
Effect of Atorvastatin on Endothelium-Dependent Vasodilation in Postmenopausal Women with Average Serum Cholesterol Levels
No full textNon-invasive assessment of coronary flow velocity reserve is superior to dobutamine stress echocardiography in detecting restenosis after successful angioplasty in coronary anterior descending artery
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Come to light: detailed analysis of thermally treated Phenyl modified Carbon Nitride Polymorphs for bright phosphors in lighting applications
No full textCarbon Nitride and its polymorphs have recently gained large interests for their huge properties and applications in different fields, from lighting to photocatalysis. Further, several attempts were recently devoted to tune and control its optical and electrical properties. In this report we analyze phenyl modified Carbon Nitride structures obtained by simple thermal polymerization at different temperatures (250–400 °C) of the starting precursor: 2,4-diamino-6-phenyl-1,3,5-triazine. A multi-technique experimental data (XRD patterns, Raman, TGA and DTG, steady- time and time resolved Luminescence, Photoluminescence Excitation spectra, Reflectivity spectra) was applied to analyze the relationship between structural and optical properties and to give more insight on the effect of synthesis procedure on the final polymer. The optical properties evidenced an interesting shift towards the visible region of the absorption spectrum of the phenyl modified g-C3N4 polymer that, associated with the high optical quantum yield (about 60%) and to a broad emission in the green-red spectral region, makes the samples very suitable for lighting applications. Indeed, we report a first prototype of white LED emission by assembly of a commercial blue LED and the Phenyl modified g-C3N4 powders as phosphor, verifying the structural and optical stability over about 10,000 working hours
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