Search results for "bioma"
showing 10 items of 5541 documents
Editorial - Renewable energy sources: a strategic option also in the wine growing and winemaking sector.
2010
In tale lavoro, si analizzano le possibilità connesse allo sfruttamento dei residui di potatura dei vigneti e delle vinacce per la produzione di energia alternativa, muovendo dall'analisi di un caso studio.
Characterization of three-dimensional microstructure of composite materials by X-ray tomography
2016
Analysis methods for X-ray microtomographic images of short fibre composite materials were developed. The methods enable estimation of microstructural properties of the material, e.g., aspect ratio and orientation of fibres. Being based on X-ray microtomography and image analysis, the methods are nondestructive and do not require user intervention. In particular, a method for determination of the aspect ratio of fibres was first developed. The method contains an assumption about similarity of the shape of the fibres. The assumption was relaxed in an improved method that can estimate cross-sectional properties of fibres, too, e.g., cross-sectional area. Additionally, the effect of finite ima…
Importance of millipedes (Diplopoda) in the autumn-winter diet of Scolopax rusticola
2019
Authors examined the autumn-winter diet of the woodcock Scolopax rusticola from 407 gizzard samples originating from Crimea and Italy, resulting in a high number of millipedes (Diplopoda) in all the samples; this prey item was particularly important in terms of weight percentage. The authors consider that calcium, highly present in millipedes, should be an important source for the woodcocks’ metabolism during the autumn-winter seasons.
Hydrogels for Three-Dimensional Ionizing-Radiation Dosimetry
2021
Radiation-sensitive gels are among the most recent and promising developments for radiation therapy (RT) dosimetry. RT dosimetry has the twofold goal of ensuring the quality of the treatment and the radiation protection of the patient. Benchmark dosimetry for acceptance testing and commissioning of RT systems is still based on ionization chambers. However, even the smallest chambers cannot resolve the steep dose gradients of up to 30–50% per mm generated with the most advanced techniques. While a multitude of systems based, e.g., on luminescence, silicon diodes and radiochromic materials have been developed, they do not allow the truly continuous 3D dose measurements offered by radiation-se…
Biodegradable Metal-Organic Framework-Based Microrobots (MOFBOTs).
2020
Microrobots and metal–organic frameworks (MOFs) have been identified as promising carriers for drug delivery applications. While clinical applications of microrobots are limited by their low drug loading efficiencies and the poor degradability of the materials used for their fabrication, MOFs lack motility and targeted drug delivery capabilities. The combination of these two fields marks the beginning of a new era; MOF‐based small‐scale robots (MOFBOTs) for biomedical applications. Yet, biodegradability is a major hurdle in the field of micro‐ and nanoswimmers including small‐scale robots. Here, a highly integrated MOFBOT that is able to realize magnetic locomotion, drug delivery, and selec…
Oxidative stress biomarkers in the copepod Limnocalanus macrurus from the northern Baltic Sea : effects of hydrographic factors and chemical contamin…
2015
The importance of phytoplankton production for carbon budgets in a semiarid floodplain wetland
2011
Phytoplankton production (PP) in wetlands is not measured as often as that of macrophytes. A three year-study during a period of sustained high flooding was undertaken in a central Spanish floodplain wetland (Las Tablas de Daimiel National Park) to determine net PP, its spatial heterogeneity and controlling factors, and compare it with primary production in macrophyte communities. This enabled us to estimate carbon budgets for each community. All PP variables showed high spatial and temporal variability among sites, resulting in low coherence even when flooding connected all sites. Net PP corresponded to 25- 36% of submerged plant production and 3-10% of helophyte production. Net PP was con…
Zālāju biomasa un tās noteikšanas iespējas Vidzemes augstienes centrālajā daļā
2019
Augsnes nosaka zālāju telpisko izplatību, to īpašības ir viens no galvenajiem zālāju kvalitāti un ilgtspējīgu apsaimniekošanu ietekmējošiem faktoriem. Zālāju ekosistēmas nodrošina vitāli svarīgus ekosistēmu pakalpojumus, kuri atkarīgi no augsnes īpašībām. Zālāju biomasa ir viens no pakalpojumiem, kas ir relatīvi maz pētīts, bet tam ir milzīgs pielietošanas potenciāls ne tikai lauksaimniecībā kā lopbarībai, bet arī kā alternatīvajam bioenerģijas ieguves veidam. Pētījuma mērķis ir noskaidrot zālāju biomasas telpiskās izplatības noteikšanas un prognozēšanas iespējas, izmantojot zālāju klases un augsnes faktoru nozīmi, lai šo informāciju integrētu zālāju ekosistēmu biomasas vērtēšanā, plānošanā…
Biomarcadores en Cáncer de Próstata Resistente a la Castración Metastásico: Adquisición, Valor Pronóstico-Predictivo y Patrones de Uso en la Pr…
2020
Introducción y objetivos: El cáncer de próstata representa el segundo cáncer más frecuente en hombres, con un 15% de los casos de cáncer en varones, y es la quinta causa de mortalidad en varones. En el cáncer de próstata metastásico, los objetivos del tratamiento son la paliación de síntomas presentes (dolor) además de la prevención de la aparición de nueva sintomatología o de complicaciones (eventos esqueléticos) y la prolongación de la supervivencia. En los últimos años, el avance en el diseño de fármacos y en el conocimiento de la biología molecular del cáncer de próstata avanzado ha permitido un tratamiento más eficiente y preciso mediante el uso de biomarcadores predictivos y de respue…
Kūlas dedzināšanas izraisīto meža ugunsgrēku izplatība Latvijā un to noteicošie veģetācijas un ainavas faktori
2016
Bakalaura darba mērķis ir noskaidrot kūldegu un to izraisīto meždegu izplatību Latvijā un to noteicošos ainavas un veģetācijas faktorus. Pētījumā analizēta kūlas dedzināšanas izraisīto mežu ugunsgrēku izplatība Latvijā 2010.–2015.g., 238 zināmajos gadījumos dešifrēta ainavas struktūra un biotopi, kā arī apsekoti pieci zālāji un ievākti 100 virszemes biomasas paraugi. Rezultāti liecina, ka kūlas dedzināšana ir nozīmīgs faktors mežu ugunsgrēku izplatībā, bet tiem nav ciešas saiknes ar vispārējo mežu ugunsgrēku izplatību. Kūldegu un to izraisīto meža ugunsgrēku izplatībā nozīmīgi ainavas faktori ir ceļi un ūdensobjekti, kas saistīts vietas pieejamību un cilvēku uzturēšanos. Kūldegas un to izra…