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Klima J, Motlík J, Gabius HJ, Smetana K. Phenotypic characterization of porcine interfollicular keratinocytes separated by elutriation: a technical note. Folia Biol (Praha) 2007; 53:33-6. [PMID: 17328841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Separation of epidermal stem cells from other populations in suspensions of epidermal cells by sorting is hampered by a present lack of specific surface markers of this cell type. To address this issue we applied CCE combined with immunocytochemical phenotyping. On the basis of expression profiles for keratins (10, 14, and 19), nucleostemin, galectin-1 and epitopes reactive for this adhesion/growth-regulatory tissue lectin we identified a fraction of very small cells originating from the basal layer. The results demonstrated that CCE has potential merit for separation of epidermal cells to yield a population likely enriched in stem cells.
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Pavlok A, Lapathitis G, Cech S, Kubelka M, Lopatarova M, Holy L, Klima J, Motlik J, Havlicek V. 293 TWO-STEP MATURATION OF BOVINE OOCYTES WITHOUT CDK INHIBITORS: AN ALTERNATIVE TO AFFECT THEIR SUBSEQUENT DEVELOPMENTAL COMPETENCE. Reprod Fertil Dev 2005. [DOI: 10.1071/rdv17n2ab293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The acquisition of meiotic and developmental competence seems to correlate not only with the size of follicles and oocytes but also with the morphology and transcriptional activity of the oocyte nuclei and nucleoli. To secure or increase the fertilization and the developmental competence of bovine oocytes, we have developed a two-step culture system using the specific cyclin dependent kinase inhibitors (Butyrolactone I, Bohemine). However, these drugs have several side effects during the prolonged time of culture. To avoid this disadvantage, we have used in the present experiments modified culture conditions simulating the intrafollicular block of meiosis. In the first step of culture, bovine oocytes isolated from small, medium, and large follicles (2–3, 3–4, and 4–6 mm in diameter, respectively) were kept under conditions that secured for at least 48 h the intact germinal vesicle stage (GV) in more than 90% of oocytes. The second step represented the subsequent 20–22 h in conditions stimulating resumption of meiosis. The effectiveness of this model depended mainly on medium composition: reduced NaHCO3, substitution of serum with serum albumin, addition of antioxidants (curcumin), increased viscosity of a medium by agar (0.3%), and reduction of oxygen concentration (within 6–9%). The reduction of the proportion between the number of cumulus-oocyte complexes (COC) and the amount of medium (within 6–7 mL per COC) should amplify the GVBD-inhibiting effect of oocyte-surrounding granulosa cells. The COC were situated in clots of 6–7 COC per clot. The effectiveness and reversibility of GVBD inhibition depends also on the duration of COC isolation. The full reversibility of GVBD inhibition was controlled morphologically and also by measuring histone H1 and MAP kinase activities. The two-step versus one-step (24 h) maturation technique was evaluated by the percentage of total and hatched Day 9 blastocysts. When compared with one-step maturation, the two-step culture showed a slightly increased proportion of total and hatched blastocysts developed from the smallest follicular category (13.9 vs. 7.1% and 9.2 vs. 3.3% for total and hatched blastocysts, respectively). No significant difference was noticed between between one- and two-step culture when oocytes from large healthy follicles were used. However, the two-step maturation of oocytes from regressing follicles substantially reduced the blastocyst yield (9.7 vs. 39.1% and 4.9 vs. 26.7% for total and hatched blastocysts, respectively).
This study was supported by grant of GA CR No. 524/02/0674.
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Motlik J, Vodicka P, Klima J, Smetana K, Liu F, Gabius H. 174 ISOLATION, CULTURE AND POTENTIAL USE OF THE PORCINE NEURAL AND EPIDERMAL STEM CELLS. Reprod Fertil Dev 2005. [DOI: 10.1071/rdv17n2ab174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The mammalian brain and epidermis contain stem cells, so-called neural stem cells (NSC) and epidermal stem cells (EpSC). To achieve the full therapeutic potential of stem cells, appropriate animal models have to be used to establish the sequence of pathological changes and to test potential therapies to block these changes. In the following studies miniature pigs were used as a biomedical model. We isolated multipotent cells from brains of porcine fetuses for future use in allotransplantation experiments in the inbred miniature pig strain. Brain tissue from 40- and 80-day-old porcine fetuses was mechanically dissociated, and cells were cultured in serum-free F12/DMEM medium with B27 and N2 supplements, EGF and bFGF. In 3–5 days some cells divided and formed floating spheres that were dissociated to single cell suspension and formed secondary spheres in culture. At all time points tested, the spheres represented mixtures of undifferentiated cells stained with nestin and Ki-67 antibodies and already differentiated neurons (Tu-20, MAP2) and glia (GFAP). After being plated on laminin/fibronectin coated coverslips and cultured in medium containing 2% FBS or 1 μM retinoic acid, the spheres adhered to the surface, and flattened, and cells started to migrate out. After immunofluorescence staining with antibodies to neuronal markers Tu-20 and MAP2, glial marker GFAP and oligodendrocyte marker CNPase showed that all the three cell types were present among differentiated cells. The EpSC are characterized by a slow and unlimited proliferation rate and, therefore, they retain labelled precursors of DNA more extensively than other keratinocytes. The main pool of EpSC is located in the bulge region of the hair follicle root sheath. A new procedure to isolate porcine hair follicles including their root sheaths was developed. The keratinocytes that migrated from hair follicles in the presence of feeder cells were poorly differentiated and specifically expressed galectin-1 or galectin-1-binding sites in their nuclei in co-localization with ΔNp63α. The exclusion of feeder cells from experimental system induced formation of spheroid bodies from these keratinocytes. Approximately one-third of these spheroids were able to adhere to a surface precolonized with feeder cells and to start forming normally growing colonies. Porcine hair follicles represent an excellent model for study of the functional phenotype of hair follicle-originated keratinocytes, and the endogenous lectin Gal-1 seems to be a potential marker of the porcine stem cell compartment of the hair follicle under in vitro conditions.
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Anger M, Klima J, Kubelka M, Prochazka R, Motlik J, Schultz RM. Timing of Plk1 and MPF activation during porcine oocyte maturation. Mol Reprod Dev 2004; 69:11-6. [PMID: 15278898 DOI: 10.1002/mrd.20151] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A Polo-like kinase 1 (Plk1) appears involved in an autocatalytic loop between CDC25C phosphatase and M phase promoting factor (MPF) in Xenopus oocytes and leads to activation of MPF that is required for germinal vesicle breakdown (GVBD). Although similar evidence for such a role of Plk1 in MPF activation during maturation of mammalian oocytes is absent, changes in Plk1 enzyme activity correlate with MPF activation, Plk1 co-localizes with MPF, and microinjection of antibodies neutralizing Plk1 delays GVBD. In this study, we exploited the prolonged time required for maturation of porcine oocytes to define precisely the timing of Plk1 and MPF activation during maturation. GVBD typically occurs between 24 and 26 hr of culture in vitro and meiotic maturation is completed after 40-44-hr culture. We find that Plk1 is activated before MPF, which is consistent with its role in activating MPF in mammalian oocytes.
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Anger M, Kues WA, Klima J, Mielenz M, Kubelka M, Motlik J, Esner M, Dvorak P, Carnwath JW, Niemann H. Cell cycle dependent expression of Plk1 in synchronized porcine fetal fibroblasts. Mol Reprod Dev 2003; 65:245-53. [PMID: 12784245 DOI: 10.1002/mrd.10289] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Enzymes of the Polo-like kinase (Plk) family are active in the pathways controlling mitosis in several species. We have cloned cDNA fragments of the porcine homologues of Plk1, Plk2, and Plk3 employing fetal fibroblasts as source. All three partial cDNAs showed high sequence homology with their mouse and human counterparts and contained the Polo box, a domain characteristic for all Polo kinases. The expression levels of Plk1 mRNA at various points of the cell cycle in synchronized porcine fetal fibroblasts were analyzed by both RT-PCR and the ribonuclease protection assay. Plk1 mRNA was barely detectable in G0 and G1, increased during S phase and peaked after the G2/M transition. A monoclonal antibody was generated against an in vitro expressed porcine Plk1-protein fragment and used to detect changes in Plk1 expression at the protein level. Plk1 protein was first detected by immunoblotting at the beginning of S phase and was highest after the G2/M transition. In summary, the Plk1 expression pattern in the pig is similar to that reported for other species. The absence of Plk1 mRNA and protein appears to be a good marker for G0/G1 and thus for the selection of donor cells for nuclear transfer based somatic cloning.
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Sutovsky P, Motlik J, Neuber E, Pavlok A, Schatten G, Palecek J, Hyttel P, Adebayo OT, Adwan K, Alberio R, Bagis H, Bataineh Z, Bjerregaard B, Bodo S, Bryja V, Carrington M, Couf M, de la Fuente R, Diblik J, Esner M, Forejt J, Fulka J, Geussova G, Gjorret JO, Libik M, Hampl A, Hassane MS, Houshmand M, Hozak P, Jezova M, Kania G, Kanka J, Kandil OM, Kishimoto T, Klima J, Kohoutek J, Kopska T, Kubelka M, Lapathitis G, Laurincik J, Lefevre B, Mihalik J, Novakova M, Oko R, Omelka R, Owiny D, Pachernik J, Pacholikova J, Peknicova J, Pesty A, Ponya Z, Preclikova H, Sloskova A, Svoboda P, Strejcek F, Toth S, Tepla O, Valdivia M, Vodicka P, Zudova D. Accumulation of the proteolytic marker peptide ubiquitin in the trophoblast of mammalian blastocysts. CLONING AND STEM CELLS 2002; 3:157-61. [PMID: 11945225 DOI: 10.1089/153623001753205115] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Ubiquitination is a universal protein degradation pathway in which the molecules of 8.5-kDa proteolytic peptide ubiquitin are covalently attached to the epsilon-amino group of the substrate's lysine residues. Little is known about the importance of this highly conserved mechanism for protein recycling in mammalian gametogenesis and fertilization. The data obtained by the students and faculty of the international training course Window to the Zygote 2000 demonstrate the accumulation of ubiquitin-cross-reactive structures in the trophoblast, but not in the inner cell mass of the expanding bovine and mouse blastocysts. This observation suggests that a major burst of ubiquitin-dependent proteolysis occurs in the trophoblast of mammalian peri-implantation embryos. This event may be important for the success of blastocyst hatching, differentiation of embryonic stem cells into soma and germ line, and/or implantation in both naturally conceived and reconstructed mammalian embryos.
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Krejcik M, Zalis S, Klima J, Sykora D, Matheis W, Klein A, Kaim W. 2,2'-Azobis(pyridine) (abpy) as a multiply reducible tetradentate ligand. EPR evidence for the configurational dependence of intramolecular electron transfer in the stereoisomeric tris-chelate ruthenium complexes [Ru(abpy)n(bpy)3-n]m (n = 2, 3; m = 2+ to 3-). Inorg Chem 2002. [DOI: 10.1021/ic00067a029] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fees J, Kaim W, Moscherosch M, Matheis W, Klima J, Krejcik M, Zalis S. Electronic structure of the "molecular light switch" bis(bipyridine)dipyrido[3,2-a:2',3'-c]phenazineruthenium(2+). Cyclic voltammetric, UV/visible and EPR/ENDOR study of multiply reduced complexes and ligands. Inorg Chem 2002. [DOI: 10.1021/ic00054a009] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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McGill TC, Klima J. Critical analysis of the 'generalized coherent wave approximation'. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/3/11/008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Schadler G, Weinberger P, Gonis A, Klima J. Bloch spectral functions for complex lattices: applications to substoichiometric TiNxand the Fermi surface of TiNx. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/15/8/007] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Macounova K, Klima J, Bernard C, Degrand C. Ultrasound-assisted anodic oxidation of diuron. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(98)00310-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Loferer-Krössbacher M, Klima J, Psenner R. Determination of bacterial cell dry mass by transmission electron microscopy and densitometric image analysis. Appl Environ Microbiol 1998; 64:688-94. [PMID: 9464409 PMCID: PMC106103 DOI: 10.1128/aem.64.2.688-694.1998] [Citation(s) in RCA: 181] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
We applied transmission electron microscopy and densitometric image analysis to measure the cell volume (V) and dry weight (DW) of single bacterial cells. The system was applied to measure the DW of Escherichia coli DSM 613 at different growth phases and of natural bacterial assemblages of two lakes, Piburger See and Gossenköllesee. We found a functional allometric relationship between DW (in femtograms) and V (in cubic micrometers) of bacteria (DW = 435.V0.86); i.e., smaller bacteria had a higher ratio of DW to V than larger cells. The measured DW of E. coli cells ranged from 83 to 1,172 fg, and V ranged from 0.1 to 3.5 micron 3 (n = 678). Bacterial cells from Piburger See and Gossenköllesee (n = 465) had DWs from 3 fg (V = 0.003 micron 3) to 1,177 fg (V = 3.5 microns3). Between 40 and 50% of the cells had a DW of less than 20 fg. By assuming that carbon comprises 50% of the DW, the ratio of carbon content to V of individual cells varied from 466 fg of C micron-3 for Vs of 0.001 to 0.01 micron3 to 397 fg of C micron3 (0.01 to 0.1 micron3) and 288 fg of C micron3 (0.1 to 1 micron 3). Exponentially growing and stationary cells of E. coli DSM 613 showed conversion factors of 254 fg of C micron-3 (0.1 to 1 micron3) and 211 fg of C micron-3 (1 to 4 micron3), respectively. Our data suggest that bacterial biomass in aquatic environments is higher and more variable than previously assumed from volume-based measurements.
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Kofler N, Ruedl C, Klima J, Recheis H, Böck G, Wick G, Wolf H. Preparation and characterization of poly-(D,L-lactide-co-glycolide) and poly-(L-lactic acid) microspheres with entrapped pneumotropic bacterial antigens. J Immunol Methods 1996; 192:25-35. [PMID: 8699019 DOI: 10.1016/0022-1759(95)00267-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Poly-(lactide-co-glycolide) microspheres with entrapped antigen have shown considerable promise as controlled release vaccines. To enhance the immunomodulatory effect of LW 50020, a bacterial lysate of seven common respiratory pathogens used perorally as an immunomodulator, we prepared poly-(D,L-lactide-co-glycolide) (PLG) and poly-(L-lactic acid) (PLA) microspheres with entrapped immunomodulator by solvent evaporation or solvent extraction double emulsion techniques. Physical properties, such as particle size, LW 50020 entrapment rate, antigen release patterns and morphological characteristics were investigated. All preparations displayed a high degree of antigen loading up to 95%, whereas size, surface morphology and antigen release patterns were significantly influenced by the method of preparation and the polymer components used. Solvent evaporation microspheres are porous particles from 0.8 micron to 2.0 microns in diameter, that show a rapid antigen release for PLG, and a moderate antigen release for PLA microspheres within 33 days. Solvent extraction microspheres have proven to be particles from 1.1 microns to 5.0 microns in diameter showing a smooth surface and a medium antigen release rate over 33 days. SDS-PAGE and immunoblotting of extracted antigen confirmed that the molecular weight and antigenicity of the immunomodulator remained unaltered by the entrapment procedure.
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Penninger J, Rieker T, Romani N, Klima J, Salvenmoser W, Dietrich H, Stössel H, Wick G. Ultrastructural analysis of thymic nurse cell epithelium. Eur J Immunol 1994; 24:222-8. [PMID: 8020559 DOI: 10.1002/eji.1830240135] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Thymic nurse cells (TNC), a paradigmatic cell type of cortical epithelium, are large lymphoid-epithelial cell complexes of thymocytes enclosed within vacuoles lined by the epithelial cell membrane. TNC express major histocompatibility complex (MHC) class I and class II molecules on their surface and vacuole-lining membranes at high density and it was suggested that TNC provide an optimal microenvironment for positive selection of T cells. In this report we present electron microscopical data demonstrating that chicken TNC display morphological structures of exocytosis previously shown for hormone-secreting cells. In TNC, however, exocytosis is restricted to the capillary cleft between the epithelial cell and engulfed thymocytes. Thus, besides physical contact between the epithelial cell and enclosed thymocytes, TNC may additionally influence the development of thymocytes through release of soluble factors in a restricted microenvironment. By employing the 3-(2,4-dinitroanilino)-3'-amino-N-methyl-propylamine technique which at the ultrastructural level detects acidic organelles involved in processing of antigens presented by MHC class II molecules, we also show that TNC contain acidic compartments similar to classical antigen-presenting cells, i.e. early and late endosomes and lysosomes, albeit in a lower amount than in thymic dendritic cells. This fact provides evidence that TNC not only are capable of antigen presentation but also possess the intracellular machinery for antigen processing.
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Thiede A, Schubert G, Klima J, Schmidt L. [Enteral anastomosis with the biofragmentable Valtrac ring. A prospective study]. Chirurg 1991; 62:819-24. [PMID: 1663022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In a prospective study, 150 enteral anastomoses using the new Valtrac biofragmentable anastomosis ring (BAR) are described. The manipulation involved was simple to learn and standardised intestinal anastomoses could be created at various bowel segments. No stenoses or postoperative bleeding occurred, the suture dehiscence rate was low. The use of these rings can be recommended to achieve a high level of standardisation for colon anastomoses and small bowel-colon anastomoses without restriction, whereas for other localisations the number of cases is too small to allow a final assessment to be made.
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Hanis T, Smrz M, Klir P, Macek K, Klima J, Base J, Deyl Z. Determination of fatty acids as phenacyl esters in rat adipose tissue and blood vessel walls by high-performance liquid chromatography. J Chromatogr A 1988; 452:443-57. [PMID: 3243855 DOI: 10.1016/s0021-9673(01)81467-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Twenty-two biologically relevant (6:0-22:6) saturated, monounsaturated and polyunsaturated fatty acids were separated by reversed-phase high-performance liquid chromatography after derivatization with phenacyl bromide. An optimal resolution of the critical combinations linolenic-myristic, docosahexaenoic-palmitoleic-arachidonic and palmitic-oleic acids and cis and trans isomers of octadecenoic (n9) and octadecadienoic (n9, 12) acids was achieved by continuous gradient elution with methanol-acetonitrile-water. Elution of mixtures of 6:0-22:1 fatty acids was completed within 80 min at a flow-rate of 1 ml/min. By the use of UV detection at 242 nm the detection limits for short- and long-chain fatty acids were found to be about 0.8 and 12 ng per injection, respectively. Linearity was tested up to 100 ng. The method was applied to the determination of fatty acids in rat adipose tissue and blood vessel walls of animals fed hydrogenated fat diets. The results are comparable to those obtained by gas chromatography and surpass the latter for the resolution of oleic and elaidic acids.
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Klima J, Petrásek R, Kočandrle V, Kašlik J. HPLC and RIA procedure for cyclosporine A determination compared with clinical background. Chromatographia 1987. [DOI: 10.1007/bf02688598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ludvik J, Klima J, Volke J, Kurfūrst A, Kuthan J. Electrochemical oxidation of substituted 1,4-dihydropyridines in non-aqueous acetonitrile. ACTA ACUST UNITED AC 1982. [DOI: 10.1016/0022-0728(82)87134-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Klima J. [Clinical experience with 0.5% jaritin ointment and comparison of its effectiveness and tolerance with 1% haloprogin ointment (author's transl)]. CESKOSLOVENSKA DERMATOLOGIE 1977; 52:319-23. [PMID: 146569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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49
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Klima J, Fischer WM. [Ways for the estimation of absolute particle values in the morphometry (author's transl)]. MIKROSKOPIE 1977; 33:134-41. [PMID: 927627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Klima J. [Report on clinical experience with antimycotic VUFB 9244 (Jopargin) (author's transl)]. CESKOSLOVENSKA DERMATOLOGIE 1976; 51:168-73. [PMID: 782733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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