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Abilov BI, Isbekov KB, Assylbekova SZ, Bulavina NB, Kulmanova GA, Koishybayeva SK, Nikolova L. Evaluation of Production and Economic Performance of Farmed Carp Using Small Lake-Commercial Fish Farms System in Southeastern Kazakhstan. Arch Razi Inst 2021; 76:1143-1154. [PMID: 35096350 DOI: 10.22092/ari.2021.355785.1722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 09/09/2021] [Indexed: 09/30/2022]
Abstract
The objective of changing the simple exploitation of fish stocks to highly efficient fish farms in lakes and reservoirs is to improve the productivity of inland freshwater fish. The small- and medium-sized lakes can be used to increase the production of farmed fish with lake management. Therefore, this study proposed to investigate the production and economic efficiency of carp in lake commercial fish farms. In this investigation, the results of carp farming experiments in fish farms in small lake commercial fish farms (LCFF) are evaluated using advanced methods and techniques. The research was carried out based on the Voroshilovsky reservoir, which operated in the LCFF mode. The farm had hatchery and carp fry ponds for expanding fingerlings based on the "Scientific and production center of fishery" LLP from 2019 to 2020. This study was performed on different types of common carp and herbivorous fish (grass and silver carp), and sexual products were collected in fried ponds and the Voroshilovsky reservoir. The absolute growth gain of common carp, silver carp, and grass carp were 301.00, 300.40, and 577.00 grams, respectively, and their mean daily weight gain values were 2.50, 2.50, and 4.80 grams. Common carp recorded the highest level of planned fish productivity (169.30 kg/ha), and the lowest level of this trait was grass carp (43.50 kg/ha). Data of mean weight and body length of common carp, grass carp, and silver carp fishes showed a variation of 4.55 kg and 56.25 cm, 6.06 kg and 75.50 cm, as well as 6.30 Kg and 75.05 cm, respectively. This difference can be justified according to the variance of fish length, which on average, 80 grams of weight is obtained per centimeter of fish length. The economic efficiency of carp was calculated, and the net profit was determined at more than 50% of total income. According to the net profit indicator, due to the implementation of a part of the fingerlings, the carp reared in the pond area; as a result, this method is profitable and accounts for 104% of the total planned economic profit. Therefore, fish production from aquaculture can rise to 10 times to maintain high-quality food security and other essential nutrients, provide job opportunities, and cash income to help job-seeking youth.
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Affiliation(s)
- B I Abilov
- Kazakh National Agrarian University, Almaty, Kazakhstan.,"Scientific and Production Center of Fisheries" LLC, Almaty, Kazakhstan
| | - K B Isbekov
- "Scientific and Production Center of Fisheries" LLC, Almaty, Kazakhstan
| | - S Z Assylbekova
- "Scientific and Production Center of Fisheries" LLC, Almaty, Kazakhstan
| | - N B Bulavina
- "Scientific and Production Center of Fisheries" LLC, Almaty, Kazakhstan
| | - G A Kulmanova
- Kazakh National Agrarian University, Almaty, Kazakhstan
| | - S K Koishybayeva
- "Scientific and Production Center of Fisheries" LLC, Almaty, Kazakhstan
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Kovachev S, Ganovska A, Sultanov E, Ivanova S, Gizdov N, Nikolova L, Iliev V. [POLYHEXAMETHYLENE BIGUANID HYDROCHLORIDE (BIGUANELLE) THERAPY OF BACTERIAL VAGINOSIS]. Akush Ginekol (Sofiia) 2016; 55 Suppl 1 Pt 2:11-15. [PMID: 27509662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
UNLABELLED The aim of our study was to determine the efficacy and tolerability of local therapy with polyhexamethylene biguanid hydrochloride (BIGUANELLE) in women with anaerobic vaginal infection. MATERIAL AND METHODS We include in our study 23 women (18-50) with established by AMSEL criteria bacterial vaginosis. In all of the women at the beginning and at the end of the survey was performed gynecological examination and microbiological research (AMSEL). The therapeutic scheme at all women is with a single vaginal application of gynecological solution BIGUANELLE. Effectiveness of the treatment was evaluated according to clinical complaints and microbiological research (Amsel criteria: Ph 4.5 >; KOH (+); "clue cells"; specific vaginal fluorine). Tolerability of patients to treatment was assessed by questionnaire. RESULTS Clinical complaints of patients after the therapy decreased as follows: vaginal fluorine with 73.9%; odor--75%; pruritus--50%; discomfort--90%. Microbiological research and their evaluation by AMSEL, showed the therapeutic efficacy of the therapy in 16 (69.6%) of all (n-23) patients. At 7 (30.4%) women, the treatment remained without effect. At questionnaire answers, 73.9% patients were satisfied with the application of BIGUANELLE, 95.6% of them have implemented it easily, 95.6% of women believe that BIGUANELLE is more convenient to use in comparison with similar products which have a daily application, and none of the patients (100%) have any complaints in applying this gynecological solution. CONCLUSIONS BIGUANELLE showed good clinical efficacy in the treatment of bacterial vaginosis. It is easily applied and well tolerated by the patients.
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LaGrange T, Reed BW, Santala MK, McKeown JT, Kulovits A, Wiezorek JMK, Nikolova L, Rosei F, Siwick BJ, Campbell GH. Approaches for ultrafast imaging of transient materials processes in the transmission electron microscope. Micron 2012; 43:1108-20. [PMID: 22595460 DOI: 10.1016/j.micron.2012.04.010] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 03/11/2012] [Accepted: 04/18/2012] [Indexed: 11/17/2022]
Abstract
The growing field of ultrafast materials science, aimed at exploring short-lived transient processes in materials on the microsecond to femtosecond timescales, has spawned the development of time-resolved, in situ techniques in electron microscopy capable of capturing these events. This article gives a brief overview of two principal approaches that have emerged in the past decade: the stroboscopic ultrafast electron microscope and the nanosecond-time-resolved single-shot instrument. The high time resolution is garnered through the use of advanced pulsed laser systems and a pump-probe experimental platforms using laser-driven photoemission processes to generate time-correlated electron probe pulses synchronized with laser-driven events in the specimen. Each technique has its advantages and limitations and thus is complementary in terms of the materials systems and processes that they can investigate. The stroboscopic approach can achieve atomic resolution and sub-picosecond time resolution for capturing transient events, though it is limited to highly repeatable (>10(6) cycles) materials processes, e.g., optically driven electronic phase transitions that must reset to the material's ground state within the repetition rate of the femtosecond laser. The single-shot approach can explore irreversible events in materials, but the spatial resolution is limited by electron source brightness and electron-electron interactions at nanosecond temporal resolutions and higher. The first part of the article will explain basic operating principles of the stroboscopic approach and briefly review recent applications of this technique. As the authors have pursued the development of the single-shot approach, the latter part of the review discusses its instrumentation design in detail and presents examples of materials science studies and the near-term instrumentation developments of this technique.
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Affiliation(s)
- Thomas LaGrange
- Condensed Matter and Materials Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA.
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Holme NCR, Nikolova L, Norris TB, Hvilsted S, Pedersen M, Berg RH, Rasmussen PH, Ramanujam PS. Physical processes in azobenzene polymers on irradiation with polarized light. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19991370110] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Petrov I, Martinov I, Kichukov K, Dimitrov C, Nikolova L. OP-018: MANUAL THROMBASPIRATION IN PPCI IN STEMI – RETROSPECTIVE ANALYSIS OF SINGLE CENTER EXPERIENCE. Int J Cardiol 2011. [DOI: 10.1016/s0167-5273(11)70129-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Affiliation(s)
- L. Nikolova
- a Central Laboratory of Optical Storage and Processing of Information, Bulgarian Academy of Sciences, P.O.B. 95, Sofia 1113, Bulgaria
| | - T. Todorov
- a Central Laboratory of Optical Storage and Processing of Information, Bulgarian Academy of Sciences, P.O.B. 95, Sofia 1113, Bulgaria
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Affiliation(s)
- L. Nikolova
- a Central Laboratory of Optical Information Storage and Processing, Bulgarian Academy of Sciences, Bulgaria
| | - T. Todorov
- a Central Laboratory of Optical Information Storage and Processing, Bulgarian Academy of Sciences, Bulgaria
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Yan C, Nikolova L, Dadvand A, Harnagea C, Sarkissian A, Perepichka DF, Xue D, Rosei F. Multiple NaNbO3/Nb2O5 heterostructure nanotubes: a new class of ferroelectric/semiconductor nanomaterials. Adv Mater 2010; 22:1741-1745. [PMID: 20496407 DOI: 10.1002/adma.200903589] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Chenglin Yan
- INRS-EMT, Université du Québec, 1650 Boul. Lionel Boulet, Varennes, QC J3X1S2, Canada
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Nikolova L, Saint-Jacques R, Ross G. Characterization of Si nanocrystals by different TEM-based techniques. Ultramicroscopy 2010; 110:144-50. [DOI: 10.1016/j.ultramic.2009.10.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Revised: 07/08/2009] [Accepted: 10/23/2009] [Indexed: 11/29/2022]
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Martínez-Ponce G, Solano C, Rodríguez-González RJ, Larios-López L, Navarro-Rodríguez D, Nikolova L. All-optical switching using supramolecular chiral structures in azopolymers. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1464-4258/10/11/115006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ilieva D, Nedelchev L, Petrova T, Dragostinova V, Todorov T, Nikolova L, Ramanujam PS. Photoinduced processes and holographic storage in stilbene and stilbenecarboxaldehyde in a polymethylmethacrylate matrix. ACTA ACUST UNITED AC 2006. [DOI: 10.1088/1464-4258/8/2/019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ilieva D, Nedelchev L, Petrova T, Tomova N, Dragostinova V, Nikolova L. Holographic multiplexing using photoinduced anisotropy and surface relief in azopolymer films. ACTA ACUST UNITED AC 2004. [DOI: 10.1088/1464-4258/7/1/005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Dimitrovska A, Nikolova L, Tolevska C, Stojkovski I, Jakimovski D. 1018 Late toxicity of radiotherapy (RT) and chemotherapy (CT) for mallgnant lymphomas. EJC Suppl 2003. [DOI: 10.1016/s1359-6349(03)91044-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Mateev V, Markovskii P, Nikolova L, Todorov T. Temperature dependence of photoinduced anisotropy in rigid solutions of azo dyes. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100186a051] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nedelchev L, Nikolova L, Todorov T, Petrova T, Tomova N, Dragostinova V, Ramanujam PS, Hvilsted S. Light propagation through photoinduced chiral structures in azobenzene-containing polymers. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/1464-4258/3/4/313] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hoffenberg S, Liu X, Nikolova L, Hall HS, Dai W, Baughn RE, Dickey BF, Barbieri MA, Aballay A, Stahl PD, Knoll BJ. A novel membrane-anchored Rab5 interacting protein required for homotypic endosome fusion. J Biol Chem 2000; 275:24661-9. [PMID: 10818110 DOI: 10.1074/jbc.m909600199] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The ras-related GTPase rab5 is rate-limiting for homotypic early endosome fusion. We used a yeast two-hybrid screen to identify a rab5 interacting protein, rab5ip. The cDNA sequence encodes a ubiquitous 75-kDa protein with an N-terminal transmembrane domain (TM), a central coiled-coil structure, and a C-terminal region homologous to several centrosome-associated proteins. rab5ip lacking the transmembrane domain (rab5ipTM(-)) had a greater affinity in vitro for rab5-guanosine 5'-O-2-(thio)diphosphate than for rab5-guanosine 5'-3-O-(thio)triphosphate. In transfected HeLa cells, rab5ipTM(-) was partly cytosolic and localized (by immunofluorescence) with a rab5 mutant believed to be in a GDP conformation (GFP-rab5(G78A)) but not with GFP-rab5(Q79L), a GTPase-deficient mutant. rab5ip with the transmembrane domain (rab5ipTM(+)) was completely associated with the particulate fraction and localized extensively with GFP-rab5(wt) in punctate endosome-like structures. Overexpression of rab5ipTM(+) using Sindbis virus stimulated the accumulation of fluid-phase horseradish peroxidase by BHK-21 cells, and homotypic endosome fusion in vitro was inhibited by antibody against rab5ip. rab5ipTM(-) inhibited rab5(wt)-stimulated endosome fusion but did not inhibit fusion stimulated by rab5(Q79L). rab5ip represents a novel rab5 interacting protein that may function on endocytic vesicles as a receptor for rab5-GDP and participate in the activation of rab5.
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Affiliation(s)
- S Hoffenberg
- Departments of Medicine (Pulmonary Division), Molecular Physiology and Biophysics, Microbiology and Immunology, and Molecular and Cellular Biology, Baylor College of Medicine and Houston Veterans Affairs Medical Center, Houston, Texas 77030, USA
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Naydenova I, Nikolova L, Ramanujam PS, Hvilsted S. Light-induced circular birefringence in cyanoazobenzene side-chain liquid-crystalline polyester films. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/1464-4258/1/4/303] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Naydenova I, Petrova T, Tomova N, Dragostinova V, Nikolova L, Todorov T. Polarization holographic gratings with surface relief in amorphous azobenzene containing methacrylic copolymers. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0963-9659/7/4/009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nikolova L, Soman K, Nichols JC, Daniel DS, Dickey BF, Hoffenberg S. Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling. Biochem J 1998; 336 ( Pt 2):461-9. [PMID: 9820825 PMCID: PMC1219892 DOI: 10.1042/bj3360461] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Tryptic proteolysis of the small GTPases Rab4 and Rab5 is a multi-step, nucleotide-dependent process. Using N-terminal peptide sequencing, matrix-assisted laser desorption ionization-time-of-flight MS and molecular modelling, we identified the three initial sites of proteolysis in Rab5 as Arg-4, Arg-81 and Arg-197. Arg-4 and Arg-81 lie within regions previously implicated in Rab5 endocytic function, and Arg-197 lies in a region involved in membrane targeting. Topologically, Arg-81 lies within the conformationally variable Switch II region shown to be important for protein-protein interactions of other GTPases. Homology modelling studies on Rab5 indicate that the Arg-81 side chain is buried in the Rab5 GTP conformation, but is solvent-accessible in the GDP conformation, explaining the dependence of proteolysis on nucleotides. Peptide mapping of Rab4 was performed to take advantage of additional scissile bonds within Switch II to determine more precisely the limits of the nucleotide-dependent protease-accessible region. The Rab4 cleavage sites corresponded to Arg-81 and Pro-87 of Rab5, and taken together with the finding that Rab5 was not cleaved at Arg-91 this analysis defines an eight-residue surface-exposed conformationally variable region lying in the centre of Switch II. A sequence comparison of Rab proteins shows these eight residues to have a loosely conserved motif that we term Switch II(v) for its relative variability. C-terminal to Switch II(v) is a highly conserved Rab-specific YYRGA motif that we term Switch II(c) for its constant sequence. N-terminal to Switch II(v) is a sequence-invariant G-domain involved in nucleotide binding and hydrolysis. We propose that the Rab Switch II(v) region imparts specificity to nucleotide-dependent protein-protein interactions.
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Affiliation(s)
- L Nikolova
- Department of Medicine, Houston VA Medical Center, 2002 Holcombe Blvd., Houston, TX 77030, USA
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Affiliation(s)
- K. Ignatova
- University of Chemical Technology and Metallurgy, Sofia, Bulgaria, and Institute of Applied Mineralogy, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - L. Nikolova
- University of Chemical Technology and Metallurgy, Sofia, Bulgaria, and Institute of Applied Mineralogy, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - W. Dimov
- University of Chemical Technology and Metallurgy, Sofia, Bulgaria, and Institute of Applied Mineralogy, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Nikolova L, Todorov T, Ivanov M, Andruzzi F, Hvilsted S, Ramanujam PS. Polarization holographic gratings in side-chain azobenzene polyesters with linear and circular photoanisotropy. Appl Opt 1996; 35:3835-40. [PMID: 21102782 DOI: 10.1364/ao.35.003835] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We investigate thin phase polarization holographic gratings recorded with two waves with orthogonal linear polarizations in materials in which illumination with linearly/circularly polarized light gives rise to linear/circular birefringence. The theoretical analysis shows that the presence of circular photoanisot-ropy changes significantly the diffraction characteristics of the gratings. The intensities of the waves diffracted in the +1 and -1 orders of diffraction and their ratio depend substantially on the reconstructing-wave polarization. Experiments with films of side-chain liquid-crystalline azobenzene polyester that is a photoanisotropic material of the considered type confirm the unusual polarization properties. It is shown that polarization holography may be used for real-time simultaneous measurement of photoinduced linear and circular birefringence.
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Hoffenberg S, Nikolova L, Pan JY, Daniel DS, Wessling-Resnick M, Knoll BJ, Dickey BF. Functional and structural interactions of the Rab5 D136N mutant with xanthine nucleotides. Biochem Biophys Res Commun 1995; 215:241-9. [PMID: 7575598 DOI: 10.1006/bbrc.1995.2459] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Rab5 is a Ras-related GTPase which regulates endosomal fusion. The D136N mutant of Rab5, which was predicted to switch specificity from guanine to xanthine nucleotides, was expressed in E. coli, extracted with urea, purified by column chromatography, and refolded by stepwise dialysis against buffer containing XDP. The purified protein bound xanthine nucleotides with considerably higher affinity than guanine nucleotides. In vitro prenylation of the mutant protein was highly dependent on xanthosine diphosphate. In contrast, both the wild type and mutant proteins were protected from proteolysis equally well by non-cognate and cognate triphosphate nucleosides at high concentration. The D136N Rab5 mutant appears to be a valuable reagent in conjunction with xanthine nucleotides for the study of protein-nucleotide interactions in systems in which multiple GTPases are active, although interactions with non-cognate nucleotides should be evaluated if they are present at high concentration.
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Affiliation(s)
- S Hoffenberg
- Baylor College of Medicine, Department of Medicine, Houston, TX 77030, USA
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Nikolova L, Krasnobaeva N, Manuilov N. Investigation of the homogeneity of the distribution of doped elements in oxide single crystals. Anal Bioanal Chem 1993. [DOI: 10.1007/bf00323971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nikolova L, Todorov T, Sharlandjiev P, Stoyanov S. Photoinduced anisotropy: new photopolarimetric setup for real-time measurements. Appl Opt 1992; 31:6698-6701. [PMID: 20733900 DOI: 10.1364/ao.31.006698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We describe an experimental set up that measures material optical anisotropy and its eventual evolution in real time. The setup is based on a new photopolarimeter that measures the four Stokes parameters of quasi-monochromatic light quickly and simultaneously. The photoinduced anisotropy in the material optical constants is determined from the measured Stokes parameters. The features of the experimental setup are demonstrated by simultaneous measurement of the photoinduced changes in dichroism and birefringence of layers of rigid solutions of azodyes in polymethyl methacrylate, for which it is known that linearly polarized light orients the dye molecules.
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Todorov T, Nikolova L. Spectrophotopolarimeter: fast simultaneous real-time measurement of light parameters. Opt Lett 1992; 17:358-359. [PMID: 19784327 DOI: 10.1364/ol.17.000358] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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Nikolova L. [The hemodynamic disorders in Sudeck's atrophy and the effect on them of interference therapy]. Vopr Kurortol Fizioter Lech Fiz Kult 1992:38-41. [PMID: 1384234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Interferential currents applied to the forearm fracture region of 80 patients with Sudeck atrophy eliminated hemodynamic changes in the affected limb as shown by capillaroscopy, rheovasography. The effect of the treatment is attributed to recovery of normal blood flow and microcirculation in the region of bone atrophy as well as analgetic action of pulse current.
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Nikolova L. [Physioprophylaxis and rehabilitation in patients with Sudeck's atrophy]. Vopr Kurortol Fizioter Lech Fiz Kult 1991:39-40. [PMID: 1710858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Nikolova L, Todorov T, Tomova N, Dragostinova V. Polarization-preserving wavefront reversal by four-wave mixing in photoanisotropic materials. Appl Opt 1988; 27:1598-1602. [PMID: 20531620 DOI: 10.1364/ao.27.001598] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A method of polarization (vector) wavefront reversal by four-wave mixing in a photoanisotropic material is described. Jones matrices, describing the dynamic holographic gratings recorded in the material at arbitrary polarization of the signal wave, are derived. They are employed to define the conditions for generating a wave that is fully conjugate (by polarization as well) to the signal wave. The way to achieving these conditions by optically controlling the anisotropy of the nonlinear medium is demonstrated experimentally.
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Todorov T, Nikolova L, Stoyanova K, Tomova N. Polarization holography. 3: Some applications of polarization holographic recording. Appl Opt 1985; 24:785. [PMID: 18217026 DOI: 10.1364/ao.24.000785] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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Todorov T, Nikolova L, Tomova N. Polarization holography. 2: Polarization holographic gratings in photoanisotropic materials with and without intrinsic birefringence. Appl Opt 1984; 23:4588. [PMID: 18213353 DOI: 10.1364/ao.23.004588] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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Todorov T, Nikolova L, Tomova N. Polarization holography. 1: A new high-efficiency organic material with reversible photoinduced birefringence. Appl Opt 1984; 23:4309-4312. [PMID: 18213314 DOI: 10.1364/ao.23.004309] [Citation(s) in RCA: 328] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A new organic material for polarization holographic recording--azo-dye methyl-orange, introduced in polyvinyl alcohol (PVA)--is fabricated and investigated. It possesses all the good characteristics of the known polarization-sensitive materials--high sensitivity, reversibility, etc.--but excels them substantially in the magnitude of the photoinduced birefringence: delta n > 10(-3). This makes possible the recording of reversible polarization gratings with diffraction efficiency over 30%. Depending on the conditions of production and subsequent mechanical and thermal treatments the layers of methyl orange/PVA may also have intrinsic birefringence. In this paper the results of experimental investigations into the properties of this new material are reported.
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Affiliation(s)
- T Todorov
- Bulgarian Academy of Sciences, Central Laboratory of Optical Storage and Processing of Information, P.O. Box 95, Sofia 1113, Bulgaria
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Nikolova L, Popov A, Klouchek E. [Effect of interference current and low-frequency magnetic field on tissue regeneration]. Vopr Kurortol Fizioter Lech Fiz Kult 1984:19-23. [PMID: 6332416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Todorov T, Nikolova L, Tomova N, Dragostinova V. Polarization holography for measuring photoinduced optical anisotropy. ACTA ACUST UNITED AC 1983. [DOI: 10.1007/bf00688550] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nikolova L, Takeva TS. [Cytoenzymatic and ultrastructural characteristics of the state of the ovaries in exposure to centimeter waves]. Vopr Kurortol Fizioter Lech Fiz Kult 1980:31-5. [PMID: 7189621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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36
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Nikolova L, Davidov M. [Effect of interference currents on the enzymatic activity of the injured nerve (an experimental study)]. Vopr Kurortol Fizioter Lech Fiz Kult 1978:54-7. [PMID: 726350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Nikolova L, Baltschew G. [Changes in the X-ray picture in Sudeckdistrophy after treatment with interferent current (author's transl)]. Med Klin 1977; 72:751-3. [PMID: 67556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Treatment with interferent current has been applied to 150 patients having Sudeck dystrophy (in 133 cases developed after bone fractures,in 12 cases after distortion and luxation and in 5 cases after phlegmon etc.). It has been established that the normalization of the X-ray in Sudeck distrophy of the first degree takes about 30 days, in the second degree it goes in parallel with the clinical recovery and in the third degree it takes two to four months at an average. A great advantage of the interferent current treatment is that it can be applied as a dispensary treatment in delayed callus-formation and metal osteosynthesis.
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Nikolova L. [Physical therapy in varicose symptom complex]. Ther Ggw 1971; 110:752 passim. [PMID: 5575072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Nikolova L. [Low-frequency treatment with interference current of patients with periarthritis humeroscapularis]. Munch Med Wochenschr 1970; 112:472-6. [PMID: 5315848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Nikolova L. [Experience in the treatment of fractures and some of their complications]. Vopr Kurortol Fizioter Lech Fiz Kult 1970; 35:157-60. [PMID: 5456703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Nikolova L. [Rehabilitation of patients with elbow joint contractures by means of interference current and gymnastics]. Elektromed Biomed Tech 1969; 14:202-5. [PMID: 5317059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Nikolova L. [Physical therapy in the rehabilitation of bone fracture complications]. Munch Med Wochenschr 1969; 111:592-9. [PMID: 4182928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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