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Szczepkowski J, Grochola A, Jastrzebski W, Kowalczyk P. The 41Σ+ electronic state of KLi molecule. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.09.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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27
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Jastrzebski W, Kowalczyk P, Pashov A, Szczepkowski J. The potential energy barrier of the 2(1)Pi state in KLi. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 73:117-120. [PMID: 19264538 DOI: 10.1016/j.saa.2009.02.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Revised: 01/09/2009] [Accepted: 02/03/2009] [Indexed: 05/27/2023]
Abstract
The polarisation labelling spectroscopy technique has provided detailed information about the shape of the potential barrier to dissociation of the 2(1)Pi state in KLi. The potential curve of the 2(1)Pi state is constructed using the Inverted Perturbation Approach method. Our analysis shows that the barrier height is DeltaE=20.8+/-1.0 cm(-1) relative to the dissociation limit and the barrier maximum is located at Rbar=8.2+/-0.1 A.
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Bang NH, Grochola A, Jastrzebski W, Kowalczyk P. Polarization labeling spectroscopy of highly excited 1Pi and 1Sigma+ states in NaLi. J Chem Phys 2009; 130:124307. [PMID: 19334830 DOI: 10.1063/1.3095678] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Two previously unknown (1)Pi states and one (1)Sigma(+) state of NaLi are experimentally investigated in the energy region of 34,000-36,000 cm(-1) above the bottom of the molecular ground state potential well by using polarization labeling spectroscopy technique. Potential energy curves are deduced for all three states from the observed rovibrational levels. The identity of the observed states is discussed in relation with the recently published theoretical calculations on electronic structure of NaLi by Petsalakis et al. [J. Chem. Phys. 129, 054306 (2008)] and Mabrouk and Berriche [J. Phys. B41, 155101 (2008)].
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Je¸drzejewski-Szmek Z, Łubiński D, Kowalczyk P, Jastrzebski W. Experimental investigation of the 61Π and 71Π electronic states of KLi. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.04.107] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Furmaniak S, Terzyk A, Gauden P, Lota K, Frąckowiak E, Béguin F, Kowalczyk P. Determination of the space between closed multiwalled carbon nanotubes by GCMC simulation of nitrogen adsorption. J Colloid Interface Sci 2008; 317:442-8. [DOI: 10.1016/j.jcis.2007.09.067] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2007] [Revised: 09/21/2007] [Accepted: 09/24/2007] [Indexed: 11/29/2022]
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32
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Kowalczyk P, Mrozowski M. A new conformal radiation boundary condition for high accuracy finite difference analysis of open waveguides. OPTICS EXPRESS 2007; 15:12605-12618. [PMID: 19550528 DOI: 10.1364/oe.15.012605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A highly accurate radiation boundary condition for finite difference analysis of open waveguides is introduced. The boundary condition is applicable to the structures embedded in a homogeneous medium and fitted to the cross section of the structure. The numerical tests carried out for a few types of waveguides including microstructured fibers showed that the proposed approach improves the accuracy by about an order of magnitude in comparison with the PML technique and eliminates all its disadvantages.
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33
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Je¸drzejewski-Szmek Z, Grochola A, Jastrzebski W, Kowalczyk P. The 51Πu electronic state of the lithium dimer. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.07.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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34
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Salami H, Ross AJ, Crozet P, Jastrzebski W, Kowalczyk P, Le Roy RJ. A full analytic potential energy curve for the a 3 Sigma+ state of KLi from a limited vibrational data set. J Chem Phys 2007; 126:194313. [PMID: 17523810 DOI: 10.1063/1.2734973] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Fourier transform spectra of near-infrared laser-induced fluorescence in (39)K(6)Li show transitions to high vibrational levels of both the X (1)Sigma(+) and a (3)Sigma(+) electronic states. These include 147 transitions into six vibrational levels of the a (3)Sigma(+) state, which lie between 7 and 88 cm(-1) below the dissociation asymptote. Unfortunately, their energies span less than 30% of the well depth. However, fitting those data to eigenvalues of analytical model potential functions whose outer limbs incorporate the theoretically predicted long-range form, V(R) approximately D-C(6)R(6)-C(8)R(8), yields complete, plausible potential curves for this state. The best fits converge to remarkably similar solutions which indicate that D(e)=287(+/-4) cm(-1) and R(e)=4.99(+/-0.09) A for the a (3)Sigma(+) state of KLi, with omega(e)=47.3(+/-1.4) and 44.2(+/-1.5) cm(-1) for (39)K(6)Li and (39)K(7)Li, respectively. Properties of the resulting potential are similar to those of a published ab initio potential and are consistent with those of the analogous states of Li(2), K(2), Na(2), and NaK.
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Bang NH, Grochola A, Jastrzebski W, Kowalczyk P. First observation of the 31Π and 41Π states of NaLi molecule. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.04.069] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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36
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Kubkowska M, Grochola A, Jastrzebski W, Kowalczyk P. The C1Πu and states in Li2: Experiment and comparison with theory. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.02.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Tudek B, Swoboda M, Kowalczyk P, Oliński R. Modulation of oxidative DNA damage repair by the diet, inflammation and neoplastic transformation. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2006; 57 Suppl 7:33-49. [PMID: 17228095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Accepted: 10/20/2006] [Indexed: 05/13/2023]
Abstract
Oxidative DNA damage and DNA repair may mediate several cellular processes, like replication and transcription, mutagenesis and apoptosis and thus may be important for the organism development as well as its pathogenesis, including cancer. Activity of DNA repair enzymes can depend on many factors, such as gene polymorphism, mRNA and protein level, as well as enzymes activation and inhibition. Modulation of base excision repair pathway eliminating from DNA oxidatively formed lesions may be caused by the diet, inflammation and neoplastic transformation. Reactive oxygen species and some diet components induce transcription of several Base Excision Repair enzymes, e.g. major human AP-endonuclease, (APE1) and 8-oxoG-DNA glycosylase (OGG1). The carcinogenic process in human lung decreases repair activity for 8-oxoGin transcription independent manner, but increases repair activity of epsilon A and epsilon C, as measured in tumors and unchanged lung tissues of lung cancer patients. Thus, modulation of repair enzymes activities may be a cell response on their way to differentiation ot neoplastic transformation.
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39
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Grochola A, Jastrzebski W, Kowalczyk P. New analysis of the D(4)1Πustate of Na2using polarization labelling spectroscopy. Mol Phys 2006. [DOI: 10.1080/00268970600811237] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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40
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Pashov A, Jastrzebski W, Kortyka P, Kowalczyk P. Experimental long range potential of the BΠ1 state in NaRb. J Chem Phys 2006; 124:204308. [PMID: 16774333 DOI: 10.1063/1.2198199] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The long range potential of the B 1Pi state in NaRb has been investigated by observation of rovibrational levels that it supports, including the high lying ones, with the technique of polarization labeling spectroscopy. This has allowed us to characterize the potential energy curve up to 1.9 cm(-1) from the dissociation limit. The highest observed rovibrational level v=49, J=10 has the outer turning point at R=16.48 A.
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Kowalczyk P, Wiktor M, Mrozowski M. Efficient finite difference analysis of microstructured optical fibers. OPTICS EXPRESS 2005; 13:10349-10359. [PMID: 19503250 DOI: 10.1364/opex.13.010349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A new technique of numerical analysis of microstructured optical fibers is presented. The technique combines a standard 2D finite difference equations with the discrete function expansion. By doing this one gets a matrix eigenvalue problem of a smaller size and a simple formulation of radiation boundary condition. The new algorithm was tested for the microstructures of different types and excellent agreement of the obtained results with other methods was achieved.
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42
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Grochola A, Kowalczyk P, Jastrzebski W, Pashov A. A regularized inverted perturbation approach method: Potential energy curve of the 4 1Σu+ state in Na2. J Chem Phys 2004; 121:5754-60. [PMID: 15366999 DOI: 10.1063/1.1785782] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We describe a modification of the inverted perturbation approach method allowing to construct physically sensible potential energy curves for electronic states of diatomic molecules even when some parts of the potential are not adequately characterized by the experimental data. The method is based on a simple regularization procedure, imposing an additional constraint on the constructed potential curve. In the present work it is applied to the double minimum 4 (1)Sigma(u) (+) state of Na(2), observed experimentally by polarization labeling spectroscopy technique.
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Kowalczyk P, Tanaka H, Kanoh H, Kaneko K. Adsorption energy distribution from the Aranovich-Donohue lattice density functional theory. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:2324-2332. [PMID: 15835692 DOI: 10.1021/la035748k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We propose a new methodology projected for the estimation of the adsorption energy distribution from the monolayer part of a single nitrogen adsorption isotherm determined at 77 K based on the lattice density functional theory (DFT) via the Aranovich-Donohue formalism. At first sight, the presented approach is computationally more difficult than a classical one. However, it is more flexible and comprehensible. Next, we developed a numerical program and used it for the estimation of the adsorption energy distribution from the experimental data on carbon black samples. The main nitrogen molecule-carbon black surface interaction energy can be estimated as approximately 7-8 kJ/mol, but the heterogeneity of the investigated materials differs significantly. Furthermore, we compare the results obtained from the lattice DFT via the Aranovich-Donohue formalism with the solution of the integral equation with the kernel represented by the classical monolayer localized Fowler-Guggenheim isotherm equation. The similarity between these two independent approaches is observed. The proposed methodology can be used for the investigation of the energetic heterogeneity of not only the carbonaceous materials but also the other "flat-surfaced" solids.
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Siński M, Kowalczyk P, Stolarczyk A, Sawionek Ł, Przybylski J. Influence of the stimulation of central chemoreceptors on the gastric mucosal blood flow in artificially ventilated and spontaneously breathing rats. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2003; 54:553-9. [PMID: 14726610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/26/2003] [Accepted: 10/01/2003] [Indexed: 04/28/2023]
Abstract
Respiratory failure coincides frequently with the occurrence of gastric ulceration. In advanced respiratory insufficiency hypoxemia is often accompanied by hypercapnia, which is the stimulus for central chemoreceptors as well as for carotid body chemoreceptors. The purpose of the work was to investigate the reflex effect of stimulation of central chemoreceptors on gastric mucosal blood flow (GMBF) in the rat. Central chemoreceptors were stimulated by a gas mixture composed of 10% carbon dioxide, 50% oxide and 40% nitrogen. In artificially ventilated and spontaneously breathing animals, the stimulation of central chemoreceptors caused a significant increase in gastric mucosal vascular resistance, accompanied by a marked decline in blood flow. We hypothesize that in patients with respiratory insufficiency accompanied by hypercapnia, the reflex impairment of GMBF may contribute to gastric ulceration.
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Charmas B, Skubiszewska-Zięba J, Leboda R, Turov V, Kowalczyk P. Effect of hydrothermal treatment on the structure of water layers in carbosils suspensions. Colloids Surf A Physicochem Eng Asp 2003. [DOI: 10.1016/s0927-7757(03)00103-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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46
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Jastrzebski W, Nadyak R, Kowalczyk P. Potential curve of the 41Σ+ state of NaK by polarisation labelling spectroscopy. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00729-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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47
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Grochola A, Jastrzebski W, Kowalczyk P, Crozet P, Ross A. The molecular constants and potential energy curve of the D1Π state in KLi. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00396-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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48
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Sadeghi N, Kowalczyk P, Setser DW. The Cu*(2D5/2 and 2D3/2) chemiluminescent reactions with ClF. Phys Chem Chem Phys 2003. [DOI: 10.1039/b300287j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Matuszewska G, Roskosz J, Włoch J, Jurecka-Tuleja B, Hasse-Lazar K, Kowalczyk P, Jarzab B. [Evaluation of effects of L-thyroxine therapy in differentiated thyroid carcinoma on the cardiovascular system --prospective study]. WIADOMOSCI LEKARSKIE (WARSAW, POLAND : 1960) 2002; 54 Suppl 1:373-7. [PMID: 12182052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Patients with differentiated thyroid carcinoma are treated by thyreoidectomy, followed by radioiodine treatment. A life-time suppressive therapy with L-thyroxine is also indicated. However, it may cause cardiovascular side effects. The aim of the study was a prospective evaluation of the left ventricle hypertrophy in patients treated with suppressive doses of thyroxine. A significant rise in left ventricular mass and mass index was noted during the first year of therapy and could be prevented by a simultaneous treatment with low doses of bisoprolol.
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Siński M, Kowalczyk P, Stolarczyk A, Sawionek L, Przybylski J. Influence of the stimulation of carotid body chemoreceptors on the gastric mucosal blood flow in artificially ventilated and spontaneously breathing rats. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2002; 53:359-69. [PMID: 12369734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
The cardiovascular effects of the stimulation of arterial chemoreceptors are different in spontaneously breathing and artificially ventilated animals. Respiratory failure and long term sojourn at high altitude coincide frequently with the occurrence of gastric ulceration. In both these situations a profound stimulation of arterial chemoreceptors is present. The purpose of the paper was to investigate the reflex effect of stimulation carotid chemoreceptors on gastric mucosal blood flow in the rat. Arterial chemoreceptors were stimulated by two methods (I) substitution gas mixture of 10% oxygen in nitrogen for room air and (II) direct injection of acid saline ( 0.05 ml, pH = 6.8) into the distal part of left common carotid artery. In artificially ventilated rats stimulation of arterial chemoreceptors caused significant increase in gastric mucosal vascular resistance, accompanied by marked decline in blood flow. This effect was mediated by adrenergic mechanism. On the contrary to artificially ventilated rats, decline of gastric mucosal vascular resistance with concomitant increase in blood flow was found in spontaneously breathing animals. This effect was not abolished either by phentolamine or atropine. As vasodilatatory effect of arterial chemoreceptors stimulation was abolished by bilateral vagotomy, we postulate that non adrenergic and non cholinergic vagal fibers mediate observed vascular changes in gastric mucosa in spontaneously breathing rats. We hypothesize that in artificially ventilated patients with respiratory failure stimulation of arterial chemoreceptors by hypoxemia and or acidosis may contribute to the development of gastric mucosal lesions.
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