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1
Content available remote

Liquid Phase Contained in Porous Rock as Observed by Proton Magnetic Relaxation

100%
Harańczyk H., Wójcik A.
Acta Physica Polonica A
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2000
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vol. 98
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issue 1-2
153-161
EN
High power proton relaxometry was applied to investigate the liquid phase contained in porous rock. Proton free induction decays and spin-lattice relaxation times allowed us to investigate the pore distribution and the contribution of mobile and of immobilized liquid. The differences in pore distributions in oil-containing limestone and in Węglowicki sandstone were found. The fractal exponent for pore distribution in Węglowicki sandstone was fitted using both stretched exponential and modified stretched exponential models. The results of both approaches are compared.
2
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Content available

Bound Water Structure on the Surfaces of Usnea antarctica as Observed by NMR and Sorption Isotherm

81%
Harańczyk H., Pietrzyk A., Leja A., Olech M.
Acta Physica Polonica A
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2006
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vol. 109
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issue 3
411-416
EN
Hydration courses and proton free induction decays are recorded at 30 MHz for Usnea antarctica thalli hydrated from gaseous phase. NMR data combined with gravimetry allow one to distinguish two fractions of tightly bound water, and loosely bound/free water pool. No water fraction "sealed" in thallus structures is present in U. antarctica.
3
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The Effect of Water Accessible Paramagnetic Ions on Subcellular Structures Formed in Developing Wheat Photosynthetic Membranes as Observed by NMR and by Sorption Isotherm

81%
Harańczyk H., Leja A., Strzałka K.
Acta Physica Polonica A
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2006
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vol. 109
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issue 3
389-398
EN
The rehydration from the gaseous phase of the developing native or EDTA-washed from unbound and loosely bound paramagnetic ions wheat thylakoid membrane lyophilizate was investigated using hydration kinetics, sorption isotherm, and high power proton relaxometry. Hydration time courses are single exponential for all target humidities. The sorption isotherm is well fitted by the Dent model, with the mass of water saturating primary binding sites equal toΔ M/m_ 0=0.024 and 0.017 for native and EDTA-washed membranes, respectively. Proton free induction decays distinguish: (i) a Gaussian component, S_0, coming from protons of solid matrix of lyophilizate; (ii) a Gaussian component, S_1, from water bound to the primary water binding sites in proximity of water accessible paramagnetic ions; (iii) an exponentially decaying contribution, $L_1$, from water tightly bound to lyophilizate surface; and (iv) exponentially decaying loosely bound water pool, L_2. Sorption isotherm fitted to NMR data shows a significant contribution of water "sealed" in membrane structures (Δ M_s/m_0=0.052 for native and 0.061 for EDTA-washed developing membranes, respectively).
4
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Water Bound in Elytra of the Weevil Liparus glabrirostris (Küster, 1849) by NMR and Sorption Isotherm (Coleoptera: Curculionidae)

81%
Harańczyk H., Florek M., Nowak P., Knutelski S.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
491-496
EN
Scanning electron microscopy micrograms of the elytra of Liparus glabrirostris showed a different dorsal and ventral surface and a multilayered inner structure. Hydration kinetics, sorption isotherm, and proton free induction decays are measured for hydrated elytra of the weevil species Liparus glabrirostris (Coleoptera: Curculionidae) in the atmosphere with controlled humidity. Very tightly bound water fraction with the mass Δ m/m_0 = 0.037 ± 0.004, and very short hydration time, tightly bound water Δ m/m_0 = 0.034 ± 0.009, and hydration time t_1^{h} = (3.31 ± 0.93) h, and finally loosely bound water fraction with t_2^{h} = (25.5 ± 7.8) h were distinguished. The sorption isotherm is sigmoidal in form, with the mass of water saturating primary water binding sites equal of Δ M/m_0 = 0.036. The proton free induction decays show the presence of solid signal (well fitted by a Gaussian function) from elytra (T_{2G}* ≈ 18 μs), the immobilized water fraction (T_{2L_1}* ≈ 120 μs) and mobile water pool (T_{2 L_2}* ≈ 300 μs). The hydration dependence of the water bound in elytra of L. glabrirostris, L/S is linear showing the absence of water-soluble solid fraction and negligible content of water pool "sealed" in pores of the structure.
5
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Initial Phases of DNA Rehydration by NMR and Sorption Isotherm

81%
Harańczyk H., Czak J., Nowak P., Nizioł J.
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issue 2
397-402
EN
T*he initial stages of rehydration of salmon sperm deoxyribonucleic acid (DNA) lyophilizates were observed using hydration kinetics, sorption isotherm, and high power proton relaxometry (at 30 MHz). T*he hydration kinetics reveals (i) a very tightly bound water not removed by incubation over silica gel (A_0^{h} = 0.057 ± 0.010), (ii) a tightly bound water [saturating at A_1^{h} = 0.149 ± 0.007, hydration time t_1^{h} = (0.27 ± 0.08) h], a tightly bound water (iii) [saturating at A_2^{h} = 0.694 ± 0.039, with the hydration time t_2^{h} = (9.8 ± 3.2) h], and (iv) a loosely bound water fraction for the samples hydrated at p/p_{0} ≥ 76% [with the hydration time t_3^{h} = (44 ± 14) h, and the contribution progressively increasing with the air humidity]. For the hydration at p/p_{0} = 100%, after t_{0} = (244 ± 22) h of incubation the swelling process begins. T*he amount of additional water uptake at swelling depended on the macrostructure of the sample. Sorption isotherm is sigmoidal in form and is fitted well by the Dent model with the mass of water saturating primary binding sites Δ M/m_{0} = 0.114. Proton free induction decay is a superposition of the immobilized proton signal (Gaussian, with T*_{2S} ≈ 20 μs) and two liquid signal components coming from tightly bound (T*_{2L_1} ≈ 100 μs, with the mass saturating at Δ m/m_{0} = 0.111 ± 0.044) and loosely bound water fraction (with the amplitude proportional to the mass of water added).
6
Content available remote

Maturation Process of Photosynthetic Membranes Observed by Proton Magnetic Relaxation and Sorption Isotherm

81%
Harańczyk H., Leja A., Jemioła-Rzemińska M., Strzałka K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
526-532
EN
Mild rehydration from the gaseous phase of the developing and mature lyophilized wheat photosynthetic membranes was investigated using hydration kinetics, adsorption isotherm and high power proton relaxometry. Hydration time courses are single exponential for all target air humidities; the hydration time t^h equals to (11.9±3.6) h for the mature membranes, and (17.0±3.2) h for the developing membranes. The sorption isotherm is sigmoidal in form and well fitted using the Dent model; the mass of water saturating primary binding sites equals Δ M/m_0= 0.033±0.013 and 0.025±0.007 for the mature and for the developing membranes, respectively, where m_0 is the dry mass of the sample, and Δ M is mass of water taken up. Proton free induction decays distinguish: (i) an immobilized proton (Gaussian) component, S_0, originating from protons of solid matrix of lyophilizate; (ii) a Gaussian component, S_1, from water bound to the primary water binding sites and localized in proximity of paramagnetic ions; (iii) an exponentially decaying contribution, L_1, from water tightly bound to lyophilizate surface; and (iv) exponentially decaying loosely bound water pool, L_2. A significant contribution of water "sealed" in the structure of lyophilized membrane (from the fraction S_1 and L_1) is detected. The mass of "sealed" water fraction is Δ M_{S}/m_0 = 0.047±0.023 and 0.072±0.021 for the mature and for the developing membranes, respectively.
7
Content available remote

Deep Dehydration of Antarctic Lichen Leptogium puberulum Hue Observed by NMR and Sorption Isotherm

81%
Harańczyk H., Bacior M., Jastrzębska P., Olech M.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
516-520
EN
Hydration kinetics, sorption isotherm, and proton free induction decays are measured for Leptogium puberulum Hue thalli hydrated from gaseous phase. Very tightly, tightly and loosely bound water fraction are distinguished. The hydration dependence of mobile NMR signal component is non-linear and fitted well by rational function, which suggest the presence of water soluble solid (presumably carbohydrate) fraction in thallus structures of L. puberulum.
8
Content available remote

Initial Phases of Antarctic Ramalina terebrata Hook f. & Taylor Thalli Rehydration Observed by Proton Relaxometry

71%
Harańczyk H., Pater Ł., Nowak P., Bacior M., Olech M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
480-484
EN
Hydration kinetics, sorption isotherm, and proton free induction decays are measured for Ramalina terebrata thalli rehydrated from gaseous phase. Very tightly, tightly, and loosely bound water fractions are distinguished. Sorption isotherm is sigmoidal in form with the mass of water saturating primary water binding sites equal to Δ m/m_0 = 0.046. Proton free induction decays show the presence of immobilized water fraction (T_{2 L_1}* ≈ 100 μs) and mobile water pool (T_{2 L_2}* ≈ 330 μs). Sorption isotherm fitted to the NMR data shows the absence of water fraction "sealed" in pores of dry thallus.
9
Content available remote

The Effect of Mild Rehydration on Freeze-Dried Dipalmitoylphosphatidylcholine (DPPC) Multilamellar Membranes as Observed by Proton NMR and Sorption Isotherm

71%
Harańczyk H., Leja A., Nowak P., Baran E., Strzałka K.
Acta Physica Polonica A
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2016
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vol. 129
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issue 2
179-184
EN
Between neighbouring bilayers of lyophilized dipalmitoylphosphatidylcholine (DPPC) multilamellar vesicles the total number of water molecules equals 9 H₂O molecules/1 DPPC molecule. One of these molecules is very tightly bound to the lipid molecule, seven are in immobilized (tightly bound) water fraction whereas the last one belongs to mobile water fraction. The rehydration from the gaseous phase of the DPPC model membranes was investigated using hydration kinetics, sorption isotherm, and high power proton relaxometry. The obtained data for DPPC were compared with these obtained for wheat photosynthetic membranes. Rehydrated photosynthetic membranes differ from DPPC model membranes in hydration kinetics. The average hydration time has a similar value: (22.0 ± 2.8) h (photosynthetic membrane) and (19.8 ± 1.6) h (DPPC), however hydration kinetics was described by one-exponential function for photosynthetic membrane, while for model membrane it shows fine double exponential form. The sigmoidal form of sorption isotherm is better fitted using Dent model than by the Brunauer-Emmett-Teller formula. The Brunauer-Emmett-Teller/Dent deviation parameter b =0.93 either for photosynthetic or for model membranes. The mass of water saturating primary water binding sites equals ΔM/m₀= 0.017 (wheat photosynthetic membranes) and 0.027 (DPPC). The detected by NMR-isotherm study mass of water "sealed" in model membrane structures was about ΔMₛ/m₀=0.182 (about 7-8 H₂O molecules/1 DPPC molecule), and ΔMₛ/m₀= 0.066 for photosynthetic membrane.
10
Content available remote

Rehydration of Digalactosyldiacylglycerol Model Membrane Lyophilizates Observed by NMR and Sorption Isotherm

71%
Harańczyk H., Bacior M., Jamróz J., Jemioła-Rzemińska M., Strzałka K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
521-525
EN
The initial stages of rehydration of digalactosyldiacylglycerol model membrane lyophilizates were observed using hydration kinetics, sorption isotherm, and high power proton relaxometry (at 30 MHz). Hydration time courses are single exponential and the sorption isotherm is sigmoidal in form. The mass of water saturating primary binding sites equals Δ M/m_0= 0.019±0.001. Proton free induction decays distinguish (i) immobilized protons of solid matrix of lyophilizate, signal S_0; (ii) protons of water fraction tightly bound to the lyophilizate surface, L_1; and (iii) mobile protons of loosely bound water pool, L_2. Hydration dependence of total water signal (L_1+L_2)/S_0 shows the presence of water fraction "sealed" in liposome structures, which equals Δ M_{S}/m_0 = 0.092±0.007.
11
Content available remote

Rehydration of CTMA Modified DNA Powders Observed by NMR

52%
Harańczyk H., Kobierski J., Zalitacz D., Nowak P., Romanowicz A., Marzec M., Nizioł J., Hebda E., Pielichowski J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
485-490
EN
The rehydration of salmon sperm deoxyribonucleic acid (DNA) and cetyltrimethylammonium chloride (C_{19}H_{42}ClN) complexes was observed using hydration kinetics, sorption isotherm, and high power proton relaxometry (at 30 MHz). The hydration kinetics shows (i) a very tightly bound water not removed by incubation over silica gel (A_0^{h} = 0.061 ± 0.004), (ii) a tightly bound water saturating at A_1^{h} = 0.039 ± 0.011, with the hydration time t_1^{h} = (1.04 ± 0.21) h, a loosely bound water fraction (iii) with the hydration time t_2^{h} = (19.1 ± 3.2) h and the contribution progressively increasing with the air humidity. For the hydration at p/p_0 = 100%, after t_0 = (152.6 ± 2.5) h of incubation the swelling process begins. The swelling time was t_3^{h} = (12.5 ± 5.4) h, and the swelling amplitude A_3^{h} = 0.140 ± 0.016. The sorption isotherm is sigmoidal in form and is fitted by the Dent model with the mass of water saturating primary binding sites Δ M/m_0 = 0.102 ± 0.021. Proton free induction decay is a superposition of the immobilized proton signal (Gaussian, with T_{2S}* ≈ 30 μs) and two liquid signal components coming from tightly bound (T_{2 L_1}* ≈ 100 μs) and loosely bound water fraction with the amplitude proportional to the mass of water added (T_{2 L_2}* ≈ 1000 μs).
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