12 research outputs found
Wp艂yw wybranych parametr贸w fizykochemicznych na jako艣膰 lateksu naturalnego /
Promotor: Wac艂aw Adamczyk.Niepublikowana praca doktorska.Praca doktorska. Akademia Ekonomiczna (Krak贸w). Wydzia艂 Towaroznawstwa, 2006.Bibliogr. k. 111-113
Wp艂yw wybranych parametr贸w fizykochemicznych na jako艣膰 lateksu naturalnego : praca doktorska /
G艂贸wnym celem pracy by艂o opracowanie, na podstawie pomiaru wybranych w艂a艣ciwo艣ci fizykochemicznych, metodyki okre艣lania jako艣ci lateksu stosowanego do wyrobu produkt贸w lateksowych maczanych. Podj臋te w pracy zagadnienia obejmuj膮 wyb贸r parametr贸w mog膮cych zaburza膰 jako艣膰 lateksu podczas transportu i przechowywania oraz wyb贸r w艂a艣ciwo艣ci fizykochemicznych, kt贸re mog膮 korelowa膰 z podanymi parametrami. Za pomoc膮 pomiar贸w lepko艣ci, przewodnictwa elektrycznego oraz pH w zale偶no艣ci od parametr贸w mog膮cych mie膰 wp艂yw na jako艣膰 lateksu, wyznaczone zosta艂y zale偶no艣ci funkcjonalne mi臋dzy stanem lateksu i mierzonymi w艂a艣ciwo艣ciami fizykochemicznymi. Analiza statystyczna i interpretacja uzyskanych wynik贸w wykaza艂y, 偶e lateks jest bardzo wra偶liwy na zmiany 艣rodowiska zewn臋trznego, jest ciecz膮 nienewtonowsk膮, zale偶n膮 od temperatury otoczenia. Jest wra偶liwy na wstrz膮sy, obecno艣膰 zanieczyszcze艅 a nawet na niekt贸re materia艂y, z kt贸rymi ma styczno艣膰. (streszcz. wg bazy: Nauka Polska)
Ueber die mikrobiologische Method zur Bestimmung des Phosphorbed眉rfnisses des Bodens mittels Aspergillus niger
Prediction of the turbulent round free jet, including fluctuationg velocities correlations, by means of a simplified second-order closure scheme
Suboxic Deposition of Ferric Iron by Bacteria in Opposing Gradients of Fe(II) and Oxygen at Circumneutral pH
The influence of lithotrophic Fe(II)-oxidizing bacteria on patterns of ferric oxide deposition in opposing gradients of Fe(II) and O(2) was examined at submillimeter resolution by use of an O(2) microelectrode and diffusion microprobes for iron. In cultures inoculated with lithotrophic Fe(II)-oxidizing bacteria, the majority of Fe(III) deposition occurred below the depth of O(2) penetration. In contrast, Fe(III) deposition in abiotic control cultures occurred entirely within the aerobic zone. The diffusion microprobes revealed the formation of soluble or colloidal Fe(III) compounds during biological Fe(II) oxidation. The presence of mobile Fe(III) in diffusion probes from live cultures was verified by washing the probes in anoxic water, which removed ca. 70% of the Fe(III) content of probes from live cultures but did not alter the Fe(III) content of probes from abiotic controls. Measurements of the amount of Fe(III) oxide deposited in the medium versus the probes indicated that ca. 90% of the Fe(III) deposited in live cultures was formed biologically. Our findings show that bacterial Fe(II) oxidation is likely to generate reactive Fe(III) compounds that can be immediately available for use as electron acceptors for anaerobic respiration and that biological Fe(II) oxidation may thereby promote rapid microscale Fe redox cycling at aerobic-anaerobic interfaces
Richness of human gut microbiome correlates with metabolic markers
We are facing a global metabolic health crisis provoked by an obesity epidemic. Here we report the human gut microbial composition in a population sample of 123 non-obese and 169 obese Danish individuals. We find two groups of individuals that differ by the number of gut microbial genes and thus gut bacterial richness. They contain known and previously unknown bacterial species at different proportions; individuals with a low bacterial richness (23% of the population) are characterized by more marked overall adiposity, insulin resistance and dyslipidaemia and a more pronounced inflammatory phenotype when compared with high bacterial richness individuals. The obese individuals among the lower bacterial richness group also gain more weight over time. Only a few bacterial species are sufficient to distinguish between individuals with high and low bacterial richness, and even between lean and obese participants. Our classifications based on variation in the gut microbiome identify subsets of individuals in the general white adult population who may be at increased risk of progressing to adiposity-associated co-morbidities