26
|
Piasecka M, Błasiak S, Musiał T. Numerical calculations of the thermal deformations of the rectangular minichannel walls. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
27
|
Maciejewska B, Strąk K, Piasecka M. Determination of the heat transfer coefficient from IRT measurement data using the Trefftz method. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
28
|
Piasecka M, Strąk K. Effect of the heating surface enhancement on the heat transfer coefficient for a vertical minichannel. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
29
|
Pastuszko R, Piasecka M. Hysteresis of boiling for different tunnel-pore surfaces. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159202060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
30
|
Piasecka M, Maciejewska B. Analysis of heat transfer coefficient for variable spatial orientation of a minichannel with an enhanced surface at incipience of boiling. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159202068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
31
|
Piasecka M, Ziętala K. Impact of selected parameters on the development of boiling and flow resistance in the minichannel. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159202069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
32
|
Hożejowska S, Piasecka M, Hożejowski L. Two dimensional heat transfer problem in flow boiling in a rectangular minichannel. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159202023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
33
|
Piasecka M. Heat transfer research on enhanced heating surfaces in flow boiling in a minichannel and pool boiling. ANN NUCL ENERGY 2014. [DOI: 10.1016/j.anucene.2014.06.041] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
34
|
Piasecka M, Maciejewska B. Heat transfer coefficient determination for flow boiling in vertical and horizontal minichannels. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146702094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
35
|
Hożejowska S, Piasecka M. Numerical modelling of temperature fields in the flow boiling liquid through a vertical minichannel with an enhanced heating surface. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146702038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
36
|
Hożejowska S, Piasecka M, Hożejowski L. Trefftz method for solving two-dimensional temperature field of boiling fluid flowing along the minichannel. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134501040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
37
|
Fraczek M, Piasecka M, Boksa M, Czernikiewicz A, Gaczarzewicz D, Szumala-Kakol A, Kazienko A, Kurpisz M. Complex analysis of molecular changes in human-ejaculated spermatozoa occuring during in vitro semen bacterial infection. J Reprod Immunol 2012. [DOI: 10.1016/j.jri.2012.03.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
38
|
Fraczek M, Piasecka M, Gaczarzewicz D, Szumala-Kakol A, Kazienko A, Lenart S, Laszczynska M, Kurpisz M. Membrane stability and mitochondrial activity of human-ejaculated spermatozoa during in vitro experimental infection with Escherichia coli, Staphylococcus haemolyticus and Bacteroides ureolyticus. Andrologia 2012; 44:315-29. [PMID: 22348773 DOI: 10.1111/j.1439-0272.2012.01283.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/15/2011] [Indexed: 11/26/2022] Open
|
39
|
Piasecka M, Maciejewska B. The solution of the two-dimensional inverse heat transfer problem with the use of the FEM in combination with Trefftz functions. EPJ WEB OF CONFERENCES 2012. [DOI: 10.1051/epjconf/20122501073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
40
|
Piasecka M. Investigation into flow boiling heat transfer in a minichannel with enhanced heating surface. EPJ WEB OF CONFERENCES 2012. [DOI: 10.1051/epjconf/20122501072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
41
|
Piasecka M, Maciejewska B. FEM method with the use of Trefftz functions for determination of heat transfer coefficient in a minichannel. EPJ WEB OF CONFERENCES 2012. [DOI: 10.1051/epjconf/20122502022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
42
|
Lydka M, Piasecka M, Gaczarzewicz D, Koziorowski M, Bilinska B. Administration of Flutamide Alters Sperm Ultrastructure, Sperm Plasma Membrane Integrity and its Stability, and Sperm Mitochondrial Oxidative Capability in the Boar: In Vivo and In Vitro Approach. Reprod Domest Anim 2011; 47:635-43. [DOI: 10.1111/j.1439-0531.2011.01935.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
43
|
Fraczek M, Piasecka M, Gaczarzewicz D, Szumala-Kakol A, Kazienko A, Laszczynska M, Kurpisz M. Relationship between semen infection and sperm quality—in vitro study. J Reprod Immunol 2011. [DOI: 10.1016/j.jri.2011.06.079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
44
|
Fraczek M, Piasecka M, Szumala-Kakol A, Jedrzejczak P, Kurpisz M. In vitro model of semen inflammation; link to sperm membrane status, mitochondria potential and innate immunity. J Reprod Immunol 2010. [DOI: 10.1016/j.jri.2010.06.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
45
|
Piasecka M, Gaczarzewicz D, Laszczyńska M, Starczewski A, Brodowska A. Flow cytometry application in the assessment of sperm DNA integrity of men with asthenozoospermia. Folia Histochem Cytobiol 2007; 45 Suppl 1:S127-S136. [PMID: 18292820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Abstract
Sperm genomic integrity and ultrastructural features of ejaculated spermatozoa contributing to the assessment of gamete fertility potential in patients with asthenozoospermia are discussed. The proportion of TUNEL-positive cells was significantly higher in the semen of patients with low sperm motility (n=40; p<0.01) as compared to men with normal sperm motility (n=54). Sperm DNA fragmentation negatively correlated (n=94) with sperm motility, sperm concentration, and integrity of the sperm cellular membrane (HOS-test). Two categories of patients were distinguished: (1) patients (23 out of 94 subjects) with < or = 4% of TUNEL-positive cells and (2) patients (71 subjects) with 4% of TUNEL-positive cells. A significant difference was noted in the sperm motility and HOS-test results between patients from both groups. Large numbers of immature spermatozoa with extensive cytoplasmic retention, ultrastructural chromatin and midpiece abnormalities, and conglomerates containing sperm fragments were present more frequently in the semen of asthenozoospermic subjects with >4% of TUNEL-positive sperm cells. Low sperm motility seems to be accompanied by serious defects of gamete chromatin expressed as diminished sperm genomic integrity and abnormal DNA condensation and by defects of sperm midpiece. These abnormalities may reflect developmental failure during the spermatogenic remodeling process. The DNA fragmentation test may be considered as an additional assay for the evaluation of spermatozoa beside standard analysis and taken together with electron microscopy may help to determine the actual number of "healthy" spermatozoa thereby playing an important role during diagnosis and treatment of male infertility.
Collapse
|
46
|
Piasecka M, Gaczarzewicz D, Laszczyńska M. Evaluation of sperm genomic integrity of normozoospermic men: a prospective study. Folia Histochem Cytobiol 2006; 44:117-22. [PMID: 16805137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023] Open
Abstract
The objective of our study was to evaluate the incidence of spermatozoa with nuclear DNA strand breaks in patients with normal routine sperm parameters (26 subjects). Sperm DNA fragmentation was measured using TUNEL test assessed in flow cytometer. Variable percentages of sperm with damaged DNA (9.42 +/- 7.68%; range: 2-36) were found. Two categories of patients were distinguished: (1) patients (8 out of 26 subjects) with < or = 4% of TUNEL-positive sperm and (2) patients (18 out of 26 subjects) with > 4% of TUNEL-positive sperm. A significantly lower percentage of normal sperm forms was found in patients with > 4% of TUNEL-positive sperm than in patients with < or = 4% of TUNEL-positive sperm. Moreover, a significant negative correlation (r(s) = -0.50) was noted only between a proportion of normal sperm forms and a proportion of TUNEL-positive spermatozoa. In electron microscope, a large number of spermatozoa with immature chromatin was observed more frequently in subjects with > 4% of TUNEL-positive cells (11 out of 18 subjects). Our results suggest that in some patients with normal routine sperm parameters, DNA fragmentation may be associated with poor sperm morphology. The diminished sperm genomic integrity may result from molecular disturbances in nuclear remodeling process during spermiogenesis. TUNEL assay is a screening tool that may help to discriminate between fertile and infertile men and may help to predict successful in vitro fertilization.
Collapse
|
47
|
Piasecka M, Gaczarzewicz D, Kurzawa R, Laszczyńska M, Kram A. Diagnostic evaluation of oxidoreductive capability of sperm mitochondria. ROCZNIKI AKADEMII MEDYCZNEJ W BIALYMSTOKU (1995) 2004; 49 Suppl 1:108-10. [PMID: 15638390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
In the present paper, morphological and functional features of human sperm midpiece, contributing to the assessment of sperm fertility potential, have been described. The NADH-dependent NBT screening assay was used to identify and visualise: 1/ morphological defects of sperm midpiece, 2/ immature sperm forms with extensive cytoplasmic retention, reflecting developmental failure in spermatogenic remodelling process, 3/ cytoplasmic sperm conglomerates, related to apoptotic bodies and 4/ sperm NADH-dependent oxidoreductase system at the mitochondrial level, related to the reaction intensity. The used assay is an adequate marker of sperm mitochondrial activity and sperm maturity. It can also help discover sperm defects that result in asthenozoospermia and can be used as an additional indicator in the evaluation of the sperm midpiece, as well as in routine morphological examination of spermatozoa, having a considerable predictive value for in vivo and in vitro fertilization.
Collapse
|
48
|
Wylot M, Laszczyńska M, Słuczanowska-Glabowska S, Piasecka M. Aging process of epithelial cells of the rat prostate lateral lobe in experimental hyperprolactinemia induced by haloperidol. ROCZNIKI AKADEMII MEDYCZNEJ W BIALYMSTOKU (1995) 2004; 49 Suppl 1:111-3. [PMID: 15638391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
The aim of the study was to examine the influence of hyperprolactinemia, induced by haloperidol (HAL) on age related morphology and function changes of epithelial cells in rat prostate lateral lobe. The study was performed on sexually mature male rats. Serum concentrations of prolactin (PRL) and testosterone (T) were measured. Tissue sections were evaluated with light and electron microscopy. Immunohistochemical reactions for Anti-Proliferating Cell Nuclear Antigen (PCNA) were performed. In rats of the experimental group, the mean concentration of: PRL was more than twice higher, whereas T concentration was almost twice lower than that in the control group. Light microscopy visualized the following: hypertrophy and epithelium hyperplasia of the glandular ducts, associated with increased PCNA expression. Electron microscopy revealed changes in columnar epithelial cells, concerning organelles, engaged in protein synthesis and secretion.
Collapse
|
49
|
Laszczyńska M, Słuczanowska-Głabowska S, Piasecka M, Skowron J, Debińska-Szymańska T. Germ cells with nuclear DNA fragmentation related to apoptotic cells in rat testis in experimental hyperprolactinemia induced by metoclopramide. Folia Histochem Cytobiol 2003; 40:163-4. [PMID: 12056626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
Abstract
The cells with nuclear DNA fragmentation related to apoptosis were detected by TUNEL technique in the seminiferous epithelium of control rats and of rats with experimental hyperprolactinemia induced by metoclopramide. The percentage of convoluted tubules with apoptotic cells and the number of apoptotic cells (predominantly spermatogonia and spermatocytes) was increased in the experimental group. The results indicated stage-specific germ cell apoptosis. In the experimental group, apoptotic cells were most evident at early (I-IV), middle (VII-VIII) and late (XII-XIV) stages of the seminiferous epithelium cycle, as revealed by light and electron microscopy. We suggest that a decreased concentration of testosterone and an increased concentration of prolactin could disturb spermatogenesis and contribute to the intensive apoptosis of germ cells in rats with hyperprolactinemia. Sertoli cells which have receptors for testosterone and prolactin and play an important role in spermatogenesis and in the initiation of apoptosis in seminiferous epithelium, could mediate such an influence of both hormones.
Collapse
|
50
|
Piasecka M, Wenda-Rózewicka L, Ogoński T. Computerized analysis of cytochemical reactions for dehydrogenases and oxygraphic studies as methods to evaluate the function of the mitochondrial sheath in rat spermatozoa. Andrologia 2001; 33:1-12. [PMID: 11167513 DOI: 10.1046/j.1439-0272.2001.00369.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cytochemical reactions for mitochondrial NADH-dependent dehydrogenases (diaphorase/NADH which is related to flavoprotein), NAD-dependent dehydrogenases (isocitrate, malate) and succinate dehydrogenase were carried out in rat spermatozoa. In addition to a morphological evaluation, the intensity of the reactions was assessed using a computer image analysing system (Quantimet 600 S). The intensity of the reactions was examined in sperm midpieces by measuring integrated optical density (IOD) and mean optical density (MOD). The activity of mitochondrial respiratory chain complexes was also analysed using the polarographic method. In the population of spermatozoa studied, all whole spermatozoa midpieces were completely filled with formazans, the product of the cytochemical reaction. These morphological findings corresponded to the values obtained for IOD and MOD for the given enzymes. In the oxygraphic studies, the spermatozoa demonstrated consumption of oxygen in the presence of substrates for I, II and IV complexes and their mitochondria revealed normal integrity and sensitivity to the substrates and inhibitors. However, the oxygraphic studies revealed differences between the sperm and somatic cells. These differences concerned the stimulation of pyruvate oxidation by malate, the lack of an effect of malonic acid on phenazine methosulphate (an acceptor of electrons) oxidation and the lack of an effect of cytochrome c on ascorbate oxidation. The cytochemical method, together with densitometric measurements, enables: (1) the reaction intensity to be determined objectively; (2) subtle and dramatic differences in reaction intensity to be revealed between spermatozoa that do not differ under morphological evaluation of the intensity; (3) possible defects within the mitochondrial sheath to be located and assessed in a large number of spermatozoa. This method can be used as a screening method alongside the routine morphological examination of spermatozoa. On the other hand, the oxygraphic method in the inner membrane of mitochondria can reveal functional changes which are related to the action of respiratory chain complexes and display characteristic features of mitochondria energy metabolism. The methods used are complementary and allow the complex evaluation of mitochondria in spermatozoa. Both methods can be used in experimental and clinical studies.
Collapse
|