Search results for "bioma"
showing 10 items of 5541 documents
Skujkoku biomasas izvākšanas ilgtermiņa ietekme uz zemsedzes veģetāciju un augsnes ķīmisko sastāvu
2019
Maģistra darbs „Visas biomasas izvākšanas ilgtermiņa ietekme uz zemsedzes veģetāciju un augsnes ķīmisko sastāvu priežu un egļu audzēs” izstrādāts laika posmā no 2015. gada augusta līdz 2019. gada maijam Latvijas Valsts mežzinātnes institūtā “Silava” un Latvijas Universitātes Bioloģijas fakultātē. Pētījuma mērķis bija noskaidrot vai visas koku biomasas izvākšana no teritorijas (whole tree harvesting - WTH), ir atstājusi ilgtermiņa ietekmi uz veģetācijas atjaunošanos un augsnes ķīmisko sastāvu. Pētījumā apskatīja zemsedzes veģetāciju un augsnes ķīmisko sastāvu priežu audzēs mētrājā, lānā, šaurlapju ārenī un egles audzēs šaurlapju ārenī. Katrā no meža tipiem atlasīja teritorijas, kas bija līdz…
Visas koka biomasas izmantošanas ilgtermiņa ietekme uz veģetāciju priežu audzēs mētrājā un lānā
2017
Bakalaura darbs „Visas koka biomasas izmantošanas ilgtermiņa ietekme uz veģetāciju priežu audzēs mētrājā un lānā” izstrādāts laika posmā no 2015. gada augusta līdz 2017. gada maijam Latvijas Valsts mežzinātnes institūtā “Silava” un Latvijas Universitātes Bioloģijas fakultātē. Pētījuma mērķis ir noskaidrot vai pilnas biomasas izvākšana no teritorijas (whole tree harvesting - WTH), ir negatīvi ietekmējusi veģetācijas atjaunošanos. Pētījumā salīdzināja veģetāciju mētrājā un lānā WTH teritorija, kur audzes vecums 49 gadi ar veģetāciju šajos pat meža tipos un ģeogrāfiskajās vietās audzēs ar vecumu 16 gadi (“jaunaudze”), 46 gadi (“kontroles audze”), 120 gadi (“vidēja vecuma audze”), 160 un 200 ga…
Theoretical and experimental analysis of viscoelastic behavior of biomaterials
2014
Caracterizacion molecular del microambiente de la piel en pacientes con vitiligo, para la búsqueda de biomarcadores indicadores de respuesta a tratam…
2016
El vitiligo pertenece a una familia de enfermedades cutáneas congénitas o adquiridas, caracterizadas por falta de pigmentación en la piel en forma de máculas bien definidas, acrómicas o hipocrómicas, en las cuales se ha observado el deterioro de la función del melanocito, la célula de la piel encargada de la producción de la melanina. Aunque se ha descrito que esta enfermedad afecta entre el 0.1 y el 2% de la población mundial, su prevalencia varía considerablemente entre la población o grupo étnico analizado. Las causas del vitiligo son complejas y aún no se han comprendido en su totalidad. Varias hipótesis han sido desarrolladas para explicar el proceso de despigmentación, o incluso la de…
Physico-Chemical Properties and Use of Waste Biomass-Derived Activated Carbons
2017
Physico-Chemical Properties and Use of Waste Biomass-Derived Activated Carbons
2017
Activated carbons are widely used in different industrial processes for example as adsorbents or as support materials. Advantageously these carbons can be prepared from residual or waste biomass materials. Different raw material type and activation procedure plays an important role in the physico-chemical characteristics of activated carbon e.g. surface area, porosity and pore distribution. In this study, activated carbon has been prepared from lignocellulosic waste materials (e.g. saw dust, lignin residue) and characterized by a number of methods. Further, adsorption properties of carbons were evaluated. Adsorption capacity of dyes and metals was high (methylene blue dye 86 % and zinc meta…
Catalytic hydrothermal liquefaction of municipal sludge in subcritical water
2021
In the last decades, the dwindling of the fossil sources of energy coupled with the growth of energy demand and of waste production prompted the research in developing novel industrial technologies for renewable energy production and waste valorization. Hydrothermal liquefaction (HTL) is a good alternative to transform wet biomasses as microalgae, macroalgae, agricultural residues, food waste, and municipal sludge (MS) into value-added products with high efficiency and decreasing the amounts that has to be disposed of. HTL takes place in an aqueous environment, without the energy cost of drying the biomass, at 300-400°C and pressure of 10-40 MPa [1,2]. At these operative conditions, an inte…
Mechanisms of irreversible aquaporin-10 inhibition by organogold compounds studied by combined biophysical methods and atomistic simulations
2021
Abstract The inhibition of glycerol permeation via human aquaporin-10 (hAQP10) by organometallic gold complexes has been studied by stopped-flow fluorescence spectroscopy, and its mechanism has been described using molecular modelling and atomistic simulations. The most effective hAQP10 inhibitors are cyclometalated Au(III) C^N compounds known to efficiently react with cysteine residues leading to the formation of irreversible C–S bonds. Functional assays also demonstrate the irreversibility of the binding to hAQP10 by the organometallic complexes. The obtained computational results by metadynamics show that the local arylation of Cys209 in hAQP10 by one of the gold inhibitors is mapped int…
Synergistic effect of W incorporation and pulsed current mode on wear and tribocorrosion resistance of coatings grown by plasma electrolytic oxidatio…
2019
Ceramic coatings were grown by plasma electrolytic oxidation on 7075 Al alloy using unipolar and bipolar pulsed current waveforms with 20 and 40% cathodic duty cycles, from a silicate-based bath without and with the addition of Na2WO4. Pancake-like morphology was dominant on the coatings grown by unipolar waveform, while the bipolar waveforms promoted volcano-like morphology, increased the roughness of the coating surface and the formation of more compact layers. The coatings produced using the bipolar waveforms provided higher resistances toward both tribocorrosion and dry sliding conditions, while further improvement was achieved by the presence of tungsten. The coatings produced in tungs…