Temat: 87.56.B- - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Investigation of Radon Concentrations in Pamukkale-Turkey
Autorzy:: Kulalı, F.
Akkurt, İ.
Tematy:: 87.56.B-
87.66.-a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1402504.pdf Link otwiera się w nowym oknie
Opis:: Radon is an inert gas produced by the radioactive decay of radium with a half-life of 3.81 days. Radon is the largest source of natural ionizing radiation and every 2.6 km² of surface soil, to a depth of 15 cm, contains approximately 1 gram of radium, which releases radon in small amounts to the atmosphere. On a global scale, it is estimated that 91 TBq of radon are released from soil annually. In this work, the radon concentration in soil gas, which is transported from soil (1 m depth), is measured at five points in Pamukkale and its neighbourhood.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Challenges in Biology and Medicine with Synchrotron Infrared Light
Autorzy:: Dumas, P.
Miller, L.
Tobin, M.
Tematy:: 87.80.Dj
87.80.-y
87.64.km
87.56.B-
87.19.xj
87.16.-b
87.15.bd
78.30.-j; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1808306.pdf Link otwiera się w nowym oknie
Opis:: The brightness (or brilliance) of synchrotron radiation was exploited in infrared microspectrosocopy. Among application of this synchrotron-based microanalytical technique, biological and biomedical investigations, at the diffraction-limited spot size, are exhibit of an increasing interest among almost all the existing infrared beamline worldwide. This paper is presenting the main properties of such a source, coupled with an infrared microscope. Several important applications in biomedical field are reported: cancer cells studies and drug effects, human substantia nigra in Parkinson's disease, β-amyloids deposits in Alzheimer's disease.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparative Analysis of KP-HSA Complex by Spectroscopic Methods
Autorzy:: Mąciażek-Jurczyk, M.
Równicka-Zubik, J.
Dyja, R.
Sułkowska, A.
Tematy:: 33.50.-j
33.50.Dq
82.56.-b
87.14.-g
87.14.E-; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400125.pdf Link otwiera się w nowym oknie
Opis:: The main objective of the presented study was to characterize the high (HAS) and low affinity (LAS) binding sites of ketoprofen (KP) in human serum albumin (HSA) structure with the use of spectrofluorescence and proton nuclear magnetic resonance spectroscopy. In vitro fluorescence analysis was used to estimate the effect of KP on the HSA fluorescence. The association constants $K_{a} [M^{-1}]$ of KP-HSA complex in the HAS were determined with the use of Scatchard, Klotz, and Hill analysis. The quenching $K_{Q} [M^{-1}]$ constants were determined on the basis of the Stern-Volmer equation. Binding of ketoprofen to plasma protein was also studied with the use of 8-anilinonapthalene-1-sulfonic acid (ANS) and 5-dimethylaminonaphthalene-1-sulfonic acid (DNSA) as the fluorescence probes in IIIA and IIA subdomains of HSA, respectively. To estimate the cooperativeness in proteins Hill's coefficient $n_{H}$ was used. The analysis of proton nuclear magnetic resonance spectra of KP in the presence of HSA allows us to observe the interactions between aromatic rings of the drug and the rings of amino acids located in the hydrophobic subdomains of the protein on the basis of the changes of chemical shifts Δ σ [ppm] of drug protons resonances. Moreover the $K_{a}$ constants $[M^{-1}]$ of KP-HSA complex in the LAS were determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Antibacterial Properties of Sol-Gel Derived TiO₂ Nanoparticles
Autorzy:: Duymaz, B.
Yigit, Z.
Şeker, M.
Dündar, F.
Tematy:: 82.56.Lz
81.20.Fw
87.19.xb
81.07.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398802.pdf Link otwiera się w nowym oknie
Opis:: Efficient synthesis of antibacterial and antifungal titanium dioxide nano powders offers new advanced properties and opportunities for industrial applications. In the present study, TiO₂ nano particles were synthesized by sol-gel method using aqueous and alcoholic solutions of titanium tetraisopropoxide (TTIP). The effects of solvent type, support material (calcite, talk, zinc borate, silica) and drying temperature on antibacterial/antifungal and structural properties namely the average particle size and surface area of titania particles were investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: $\text{}^{1}$H NMR and Rheological Studies of the Calcium Induced Gelation Process in Aqueous Low Methoxyl Pectin Solutions
Autorzy:: Dobies, M.
Kuśmia, S.
Jurga, S.
Tematy:: 82.70.Gg
87.15.By
87.15.Rn
82.56.-b
87.15.He
83.10.-y
87.15.La; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2043388.pdf Link otwiera się w nowym oknie
Opis:: The $\text{}^{1}$H NMR relaxometry in combination with water proton spin-spin relaxation time measurements and rheometry have been applied to study the ionic gelation of 1% w/w aqueous low methoxyl pectin solution induced by divalent Ca$\text{}^{2+}$ cations from a calcium chloride solution. The model-free approach to the analysis of $\text{}^{1}$H NMR relaxometry data has been used to separate the information on the static (β) and dynamic (〈τ$\text{}_{c}$〉) behaviour of the systems tested. The $\text{}^{1}$H NMR results confirm that the average mobility of both water and the pectin molecules is largely dependent on the concentration of the cross-linking agent. The character of this dependency (β,〈τ$\text{}_{c}$〉 and T$\text{}_{2}$ vs. CaCl$\text{}_{2}$ concentration) is consistent with the two-stage gelation process of low methoxyl pectin, in which the formation of strongly linked dimer associations (in the range of 0-2.5 mM CaCl$\text{}_{2}$) is followed by the appearance of weak inter-dimer aggregations (for CaCl$\text{}_{2}$ ≥ 3.5 mM). The presence of the weak gel structure for the sample with 3.5 mM CaCl$\text{}_{2}$ has been confirmed by rheological measurements. Apart from that, the T$\text{}_{1}$ and T$\text{}_{2}$ relaxation times have been found to be highly sensitive to the syneresis phenomenon, which can be useful to monitor the low methoxyl pectin gel network stability.
Dostawca treści:: Biblioteka Nauki

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