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2. Measurement of fiber deposition in a human lung model by phase contrast microscopy with automated image analysis
- Creator:
- Lízal, František, Elcner, Jakub, Bělka, Miloslav, Jedelský, Jan, Hopke, Philip K., Štarha, Pavel, Druckmüllerová, Pavla, and Jícha, Miroslav
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- fiber deposition, phase contrast microscopy, and image analysis
- Language:
- English
- Description:
- Deposition of fibers in human lungs is known as a health hazard. In-vitro measurements were performed with glass fibers in a realistic model of human lungs up to the seventh generation of branching to estimate the effect of fiber size and breathing pattern on fiber deposition. Deposited fibers were rinsed from the model segments and gathered on nitrocellulose filters. Phase-contrast microscopy with high resolution camera was used to capture images of filters with fibers. New software was developed for an automated image analysis and local deposition characteristics were calculated afterwards. The whole method proved to be a useful and valuable tool for the evaluation of fiber and particle deposition. and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. On a class of m-point boundary value problems
- Creator:
- Luca, Rodica
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- differential system, boundary condition, positive solution, and fixed point theorem
- Language:
- English
- Description:
- We investigate the existence of positive solutions for a nonlinear second-order differential system subject to some m-point boundary conditions. The nonexistence of positive solutions is also studied.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
4. Photosynthetic response of beech seedlings of different origin to water deficit
- Creator:
- Pšidová, Eva, Ditmarová, Ľ., Jamnická, G., Kurjak, D., Majerová, J., Czajkowski, T., and Bolte, A.
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- fotosyntéza, buk lesní, photosynthesis, European beech, Slovensko, Slovakia, chlorophyll a fluorescence, leaf water potential, net photosynthetic rate, stomatal conductance, water-use efficiency, provenances, Fagus sylvatica, 2, and 581
- Language:
- Multiple languages
- Description:
- European beech (Fagus sylvatica L.) seedlings of three different origins were used to evaluate the effect of water deficit and recovery during the most vulnerable phase of forest tree life. Gas-exchange characteristics and fluorescence rapid light curves were studied in the seedlings from a warm region (PV1, 530 m a.s.l.), seedlings from a moderately warm region (PV2, 625 m a.s.l.), optimal for beech, and in seedlings from a cool region (PV3; 1,250 m a.s.l.). Changes in photosynthetic characteristics caused by water deficit were similar, but their intensity was dependent on the origin of the seedlings. Simulation of drought conditions by the interruption of watering led to a decrease in the efficiency of primary photochemistry in PSII, with the most significant decrease in the PV2 seedlings. Conversely, water deficit affected most significantly gas exchange in PV3, where the recovery process was also the worst. The PV1 demonstrated the highest resistance to water deficit. Drought-adaptation of beech seedlings at non-native sites seems to be linked to water availability and to the origin of the beech seedlings., E. Pšidová, Ľ. Ditmarová, G. Jamnická, D. Kurjak, J. Majerová, T. Czajkowski, A. Bolte., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public