1,720,988 research outputs found
Gestione delle Infestanti del Colza (Brassica napus var. oleifera) in Ambiente Mediterraneo: Risultati preliminari
No full textGestione delle Infestanti del Colza (Brassica napus var. oleifera) in Ambiente Mediterraneo: Risultati preliminari
No full textOptical coherence tomography angiography of central serous chorioretinopathy: quantitative evaluation of the vascular pattern and capillary flow density
Full text linkBackground: This study aimed to evaluate the vascular pattern and capillary flow density (CFD) map on optical coherence tomography angiography (OCTA) images of patients affected by central serous chorioretinopathy (CSC).
Methods: In this retrospective cohort study, OCTA (AngioVue RTVue XR Avanti, Optovue) 3 × 3 mm macula scans of both eyes of patients with CSC were taken at baseline; the images were segmented and compared with OCTA scans of fellow eyes without CSC as well as age-matched healthy subjects. OCTA images were processed by quantitative textural analysis (ImageJ software) to provide an objective grading of choroidal capillary alterations. The texture of OCTA images was examined by the autocorrelation method.
Results: In eyes with CSC (40 eyes), we found six different morphological patterns of the choriocapillaris layer vasculature (CCL), likely corresponding to different grades of OCT choroidal hyporeflectivity and OCTA reduction of the decorrelation signal. Moreover, the OCTA capillary flow density map revealed capillary depletion in the superficial capillary plexus (p value = 0.0023), in the deep vascular network (p value = < 0.0001), and in the CCL (p value = 0.0001). Such findings were not observed in healthy subjects (13 eyes).
Conclusions: OCTA in CSC is a useful tool that allows the identification of the clinical type of CSC by means of specific CCL patterns. Moreover, CFD depletion is observed in association with the inner retinal layers, pointing to an involvement of the inner blood retinal barrier in CSC. According to our results, it is plausible that the patterns observed herein may correlate to the different clinical subtypes of the disease
Annual and Perennial Crops for Bioenergy: Soil and Environmental Issues
No full textPerennial and annual crops for bioenergy production are increasing. Much of
the biomass and oil used for energetic purpose come from cultivations where
bioenergy crops are grown with relatively high inputs. Large amounts of
nutrients are removed from the soil with the harvest; and inorganic fertilizers
lead to risks of soil water pollution. This chapter reviews the effect of bioenergy
crops cultivation on soil chemical, physical, and biological properties. Variation
is considerable, soil organic C decreased in most soils under conventional row
crops, also, soil N2O emissions are common as a result of the use of N fertilizers.
There is some evidence for high leaching losses of fertilizer nutrients and loss
of biodiversity. Soil erosion is a problem on newly planted land in many parts
of the world. It is concluded that annual and perennial bioenergy crops can
both substantially contribute to the supply of renewable energy, but an improved
crop management is needed to sustain and improve the resource base on which
production depends
Biomass supply for energetic purposes from some Cardueae species grown in Mediterranean farming systems
No full text"In order to explore complementary biomass sources, field studies were conducted on Cynara cardunculus botanical varieties (globe artichoke and cultivated cardoon) for energy purposes. In addition, the potential of milk thistle (Silybum marianum L. Gaertn.) as a suitable energy crop for Southern Europe countries was investigated. The three different crops were compared over three years (2007-2010) in a Mediterranean environment (Sardinia, Southern Italy) for quantitative and qualitative (calorific value, ultimate and proximate analyses, ash composition) biomass characteristics. Annual biomass production across years averaged about 10, 4, and 16 Mg ha(-1) in cardoon, globe artichoke and milk thistle, respectively. The chemical analysis of biomass showed a similar composition among crops with a mean ash content of 14% and a higher calorific value of about 17 MJ kg(-1). Annual energy yield ranged between 64 GJ ha(-1) reached by globe artichoke and 275 GJ ha(-1) reached in milk thistle. The exploitation of globe artichoke crop residues for energetic purpose can represent a complementary income for farmers. The present study confirms the good biomass yield of cardoon in cultivation systems characterized by limited water input and indicate milk thistle as a promising crop for biomass production. Future work is necessary in order to investigate different genotypes of the three crops for potential biomass and grain yield and their chemical composition, to detect agronomic practices suitable to optimize qualitative crops performances and to set up specific cropping systems. (c) 2013 Elsevier B.V. All rights reserved.
Effetto di apparecchi ortodontici sulla flora microbica del cavo orale di soggetti in età pediatrica.
No full textDifferenziazione a Fiore della Gemma Apicale in Carciofo: Interazione tra Temperatura ed Applicazione di Acido Gibberellico
No full textAnnual and Perennial Crops for Bioenergy: Soil and Environmental Issues
No full textPerennial and annual crops for bioenergy production are increasing. Much of
the biomass and oil used for energetic purpose come from cultivations where
bioenergy crops are grown with relatively high inputs. Large amounts of
nutrients are removed from the soil with the harvest; and inorganic fertilizers
lead to risks of soil water pollution. This chapter reviews the effect of bioenergy
crops cultivation on soil chemical, physical, and biological properties. Variation
is considerable, soil organic C decreased in most soils under conventional row
crops, also, soil N2O emissions are common as a result of the use of N fertilizers.
There is some evidence for high leaching losses of fertilizer nutrients and loss
of biodiversity. Soil erosion is a problem on newly planted land in many parts
of the world. It is concluded that annual and perennial bioenergy crops can
both substantially contribute to the supply of renewable energy, but an improved
crop management is needed to sustain and improve the resource base on which
production depends
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