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Moyankova D, Stoykova P, Veleva P, Christov NK, Petrova A, Atanassova S. An Aquaphotomics Approach for Investigation of Water-Stress-Induced Changes in Maize Plants. Sensors (Basel) 2023; 23:9678. [PMID: 38139522 PMCID: PMC10747378 DOI: 10.3390/s23249678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/24/2023] [Accepted: 12/04/2023] [Indexed: 12/24/2023]
Abstract
The productivity of plants is considerably affected by various environmental stresses. Exploring the specific pattern of the near-infrared spectral data acquired non-destructively from plants subjected to stress can contribute to a better understanding of biophysical and biochemical processes in plants. Experiments for investigating NIR spectra of maize plants subjected to water stress were conducted. Two maize lines were used: US corn-belt inbred line B37 and mutant inbred XM 87-136, characterized by very high drought tolerance. After reaching the 4-leaf stage, 10 plants from each line were subjected to water stress, and 10 plants were used as control, kept under a regular water regime. The drought lasted until day 17 and then the plants were recovered by watering for 4 days. A MicroNIR OnSite-W Spectrometer (VIAVI Solutions Inc., Chandler, AZ, USA) was used for in vivo measurement of each maize leaf spectra. PLS models for determining drought days were created and aquagrams were calculated separately for the plants' second, third, and fourth leaves. Differences in absorption spectra were observed between control, stressed, and recovered maize plants, as well as between different measurement days of stressed plants. Aquagrams were used to visualize the water spectral pattern in maize leaves and how it changes along the drought process.
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Affiliation(s)
- Daniela Moyankova
- AgroBioInstitute, Agricultural Academy, 1164 Sofia, Bulgaria; (D.M.); (P.S.); (N.K.C.)
| | - Petya Stoykova
- AgroBioInstitute, Agricultural Academy, 1164 Sofia, Bulgaria; (D.M.); (P.S.); (N.K.C.)
| | - Petya Veleva
- Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria; (P.V.); (A.P.)
| | - Nikolai K. Christov
- AgroBioInstitute, Agricultural Academy, 1164 Sofia, Bulgaria; (D.M.); (P.S.); (N.K.C.)
| | - Antoniya Petrova
- Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria; (P.V.); (A.P.)
| | - Stefka Atanassova
- Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria; (P.V.); (A.P.)
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Sirakov I, Velichkova K, Dinev T, Slavcheva-Sirakova D, Valkova E, Yorgov D, Veleva P, Atanasov V, Atanassova S. Detection of Fungal Diseases in Lettuce by VIR-NIR Spectroscopy in Aquaponics. Microorganisms 2023; 11:2348. [PMID: 37764192 PMCID: PMC10537723 DOI: 10.3390/microorganisms11092348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 09/14/2023] [Accepted: 09/17/2023] [Indexed: 09/29/2023] Open
Abstract
One of the main challenges facing the development of aquaponics is disease control, due on one hand to the fact that plants cannot be treated with chemicals because they can lead to mortality in cultured fish. The aim of this study was to apply the visible-near-infrared spectroscopy and vegetation index approach to test aquaponically cultivated lettuce (Lactuca sativa L.) infected with different fungal pathogens (Aspergillus niger, Fusarium oxysporum, and Alternaria alternata). The lettuces on the third leaf formation were placed in tanks (with dimensions 1 m/0.50 m/0.35 m) filled up with water from the aquaponics system every second day. In this study, we included reference fungal strains Aspergillus niger NBIMCC 3252, Fusarium oxysporum NBIMCC 125, and Alternaria alternata NBIMCC 109. Diffuse reflectance spectra of the leaves of lettuce were measured directly on the plants using a USB4000 spectrometer in the 450-1100 nm wavelength range. In near-infrared spectral range, the reflectance values of infected leaves are lower than those of the control, which indicates that some changes in cell structures occurred as a result of the fungal infection. All three investigated pathogens had a statistically significant effect on leaf water content and water band index. Vegetative indices such as Chlorophyll Absorption in Reflectance Index (CARI), Modified chlorophyll absorption in reflectance index (MCARI), Plant Senescence Reflectance Index (PSRI), Red Edge Index (REI2), Red Edge Index (REI3), and Water band index (WBI) were found to be effective in distinguishing infected plants from healthy ones, with WBI demonstrating the greatest reliability.
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Affiliation(s)
- Ivaylo Sirakov
- Department of Animal Husbandry-Non-Ruminants and Other Animals, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Katya Velichkova
- Department of Biological Sciences, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Toncho Dinev
- Department of Biological Sciences, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Desislava Slavcheva-Sirakova
- Department of Botany and Agrometeorology, Faculty of Agronomy, Agricultural University, 12 Mendeleev blvd, 4000 Plovdiv, Bulgaria
| | - Elica Valkova
- Department of Biological Sciences, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Dimitar Yorgov
- Department of Agricultural Engineering, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Petya Veleva
- Department of Agricultural Engineering, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Vasil Atanasov
- Department of Biological Sciences, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
| | - Stefka Atanassova
- Department of Agricultural Engineering, Faculty of Agriculture, Students Campus, Trakia University, 6000 Stara Zagora, Bulgaria
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Atanassova S, Yorgov D, Veleva P, Stoyanchev T, Zlatev Z. Cheese quality assessment by use of near-infrared spectroscopy. BIO Web Conf 2023. [DOI: 10.1051/bioconf/20235802007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023] Open
Abstract
Dairy products are worldwide spread and have great commercial importance. Rapid and reliable analysis of cheese would be highly desirable both for the manufacturers and consumers. The results of experiments, related to the application of near-infrared spectroscopy for cheese quality estimation will be presented. Several kinds of Bulgarian white brine cheese - natural from cow milk, imitation products with vegetable oil, and cheese with different water content were investigated. Fatty acids composition of samples was determined by using gas chromatography and moisture content by the oven-dry method. Spectra of all tested samples were obtained with a scanning NIRQuest 512 (Ocean Optics, Inc.) instrument in the range of 900-1700 nm using a reflection fiber-optics probe. PLS models were developed for quantitative determination and SIMCA for classification. The misclassification rate of the SIMCA model for discrimination of natural cheese and imitation products with vegetable oil was 2.9%. Quantitative determination of water content based on NIR spectra showed high accuracy, Models for classification of cheese samples into 3 groups according to water content achieved 5.64% misclassification rate for the independent test set. Results showed the potential of near-infrared spectroscopy as a non-destructive and rapid screening tool for assessing cheese quality and detecting adulteration.
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Kuroki S, Tsenkova R, Moyankova D, Muncan J, Morita H, Atanassova S, Djilianov D. Water molecular structure underpins extreme desiccation tolerance of the resurrection plant Haberlea rhodopensis. Sci Rep 2019; 9:3049. [PMID: 30816196 PMCID: PMC6395626 DOI: 10.1038/s41598-019-39443-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 01/21/2019] [Indexed: 11/29/2022] Open
Abstract
Haberlea rhodopensis is a resurrection plant with an extremely high desiccation tolerance. Even after long periods of almost full desiccation, its physiological functions are recovered shortly upon re-watering. In order to identify physiological strategies which contribute to its remarkable drought stress tolerance we used near infrared spectroscopy to investigate the state of water in the leaves of this plant and compared it to its relative, non-resurrection plant species Deinostigma eberhardtii. Here we show, using a novel aquaphotomics spectral analysis, that H. rhodopensis performs a dynamic regulation of water molecular structure during dehydration directed at drastic decrease of free water molecules, increase of water molecules with 4 hydrogen bonds, and a massive accumulation of water dimers in the full desiccation stage. Our findings suggest that changes in water structure mirror the changes in major metabolites and antioxidants which together constitute a robust defense system underlying the desiccation tolerance of the resurrection plant, while the water dimer may hold special importance for the “drying without dying” ability.
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Affiliation(s)
- Shinichiro Kuroki
- Laboratory for Information Engineering of Bioproduction, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Roumiana Tsenkova
- Biomeasurement Technology Laboratory, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
| | - Daniela Moyankova
- Abiotic stress, AgroBioInstitute, Agricultural Academy, 8 Dragan Tzankov Blvd., 1164, Sofia, Bulgaria
| | - Jelena Muncan
- Nanolab, Biomedical Engineering, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, 11120, Serbia
| | - Hiroyuki Morita
- NIRECO CORPORATION, 2951-4, Ishikawa machi, Hachioji, Tokyo, Japan
| | - Stefka Atanassova
- Department of Biochemistry, Microbiology and Physics, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria
| | - Dimitar Djilianov
- Abiotic stress, AgroBioInstitute, Agricultural Academy, 8 Dragan Tzankov Blvd., 1164, Sofia, Bulgaria.
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Veleva-Doneva P, Draganova T, Atanassova S, Tsenkova R. Detection of bacterial contamination in milk using NIR spectroscopy and two classification methods - SIMCA and Neuro – Fuzzy classifier. ACTA ACUST UNITED AC 2010. [DOI: 10.3182/20101206-3-jp-3009.00039] [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] [Indexed: 11/23/2022]
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Slavov S, Valkov V, Batchvarova R, Atanassova S, Alexandrova M, Atanassov A. Chlorsulfuron resistant transgenic tobacco as a tool for broomrape control. Transgenic Res 2005; 14:273-8. [PMID: 16145835 DOI: 10.1007/s11248-004-8081-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 11/26/2022]
Abstract
Broomrape (Orobanche ramosa L.) is the most important parasitic plant that infests tobacco (Nicotiana tabacum L.). Chemical treatment of the soil is not effective and crop rotation is not acceptable to solve this problem because of the long viability period of Orobanche seeds in the soil. Application of systemic herbicides in the field with herbicide resistant tobacco could be a successful tool for broomrape control. Several tobacco cultivars were transformed with a mutant ahas3R gene for resistance to the herbicide chlorsulfuron (Glean, DuPont). Transformed plants were selfed and the segregation of resistance was followed in the next generation. The efficiency of the herbicide was demonstrated in greenhouse and field trials. An Orobanche/tobacco growth system was used in order to prove the lethal effect of the herbicide to the attached broomrape plants.
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Affiliation(s)
- S Slavov
- AgroBioInstitute, 8 Dragan Tzankov Blvd, 1164 Sofia, Bulgaria.
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Abstract
An analysis is given of several biologically important processes, connected with the crystallization and kinetics of liophilization in aqueous physiological solutions. These are glass formation and vitrification of life, precipitation of slightly soluble salts and kinetics of crystallization in human urine, and the solution of CaOX concretions under the influence of biocompatible solubilizators, which are normal constituents of human urine. The problems investigated experimentally are treated in the framework of the capillary theory of nucleation and the Debye–Hückel model of ionic solutions.
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Affiliation(s)
- I. Gutzow
- 1Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | - S. Atanassova
- 2Chair of Urology, The Medical University, Sofia 1431, Bulgaria
| | - K. Neykov
- 2Chair of Urology, The Medical University, Sofia 1431, Bulgaria
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Tsenkova R, Atanassova S, Kawano S, Toyoda K. Somatic cell count determination in cow's milk by near-infrared spectroscopy: a new diagnostic tool. J Anim Sci 2001; 79:2550-7. [PMID: 11721833 DOI: 10.2527/2001.79102550x] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [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: 11/13/2022] Open
Abstract
The potential of near-infrared spectroscopy (NIR) in the region from 1,100 to 2,500 nm to measure somatic cell count (SCC) content of cow's milk was investigated. A total of 196 milk samples from seven Holstein cows were collected for 28, consecutive days, starting from 7th d after calving, and analyzed for fat, protein, lactose, and SCC. Three of the cows were healthy, and the remainder had periods of mastitis during the experiment. Near-infrared transflectance milk spectra were obtained using an InfraAlyzer 500 spectrophotometer. The calibration for logSCC was performed using partial least square (PLS) regression and different spectral data pretreatment. The best accuracy of determination was found for an equation that was obtained using smoothed absorbance data and 10 PLS factors. The standard error of calibration was 0.361, the calibration coefficient of multiple correlation was 0.868, the standard error of prediction for independent validation set of samples was 0.382, the correlation coefficient was 0.854, and the coefficient of variation was 7.63%. The accuracy of logSCC determination by NIR spectroscopy would allow health screening of cows and differentiation between healthy and mastitic milk samples. It has been found that SCC determination by NIR milk spectra is based on the related changes in milk composition. The most significant factors that simultaneously influenced milk spectra with the elevation of SCC were alteration of milk proteins and changes in ionic concentration of milk.
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Affiliation(s)
- R Tsenkova
- Department of Environmental Information and Bio-production Engineering, Kobe University, Japan.
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Tsenkova R, Atanassova S, Ozaki Y, Toyoda K, Itoh K. Near-infrared spectroscopy for biomonitoring: influence of somatic cell count on cow's milk composition analysis. Int Dairy J 2001. [DOI: 10.1016/s0958-6946(01)00110-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tsenkova R, Atanassova S, Itoh K, Ozaki Y, Toyoda K. Near infrared spectroscopy for biomonitoring: cow milk composition measurement in a spectral region from 1,100 to 2,400 nanometers. J Anim Sci 2000; 78:515-22. [PMID: 10764056 DOI: 10.2527/2000.783515x] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.3] [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: 11/13/2022] Open
Abstract
The potential of near infrared spectroscopy (NIRS; 1,100 to 2,400 nm) to measure fat, total protein, and lactose content of nonhomogenized milk during milking and the influence of individual characteristics of each cow's milk on the accuracy of determination were studied. Milk fractions were taken during milking, twice per month, for 6 mo. Samples were taken every 2nd and 4th wk at the morning and the evening milkings. Teatcups were removed at each 3 L of milk yield as determined with a fractional sampling milk meter. A total of 260 milk samples were collected and analyzed with an NIRSystem 6500 spectrophotometer with 1-mm sample thickness. Partial least squares (PLS) regression was used to develop calibration models for the examined milk components. The comparison with the reference method was based on standard error of cross validation (SECV). The obtained SECV varied from .107 to .138% for fat content, from .092 to .125% for total protein, and from .066 to .096% for lactose content, and the accuracy of the reference method (AOAC, 1990, method No 972.16) was .05% for all measured milk components. The obtained models had lower SECV when an individual cow's spectral data were used for calibration. The reduction of SECV for each cow's individual calibration, when compared with SECV for the set of all samples, differed with the different constituents. For fat content determination, the reduction reached 22.46%, for protein 26.40%, and for lactose 31.25%. This phenomena was investigated and explained by principle component analysis (PCA) and by comparing loading of PLS factors that account for the most spectral variations for each cow and the measured milk components, respectively. The results of this study indicated that NIRS (1,100 to 2,500 nm, 1-mm sample thickness) was satisfactory for nonhomogenized milk compositional analysis of milk fractions taken in the process of milking.
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Affiliation(s)
- R Tsenkova
- Department of Environmental Information and Bio-production Engineering, Kobe University, Japan.
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Abstract
The potential of near-infrared spectroscopy to measure fat, total protein, and lactose contents of unhomogenized milk was studied for use in dairy management, as a new tool for on-line milk analysis in the process of milking. Influence of the spectral region, sample thickness, and spectral data treatment on the accuracy of determination was investigated. Transmittance spectra of 258 milk samples, collected at different stages of the milking process, were obtained with a spectrophotometer (NIRSystems 6500; FOSS-NIRSystems, Silver Spring, MD) in the wavelength range from 400 to 2500 nm with sample thicknesses of 1 mm, 4 mm, and 10 mm. The spectral region and sample thickness were found to be significant factors for milk fat and total protein determination but not the lactose determination. The best accuracy was obtained with the 1100 to 2400 nm region, 1-mm sample thickness, and the first derivative data transformation. For the spectral region from 700 to 1100 nm, close accuracy was obtained for fat with a 10-mm sample and for total protein with a 1-mm sample thickness. The sample thickness did not change significantly the accuracy of lactose determination. Different treatments of spectral data did not improve the calibrations for fat and protein. For the region from 700 to 1100 nm, where inexpensive on-line sensors could be used, the highest positive coefficients for fat were at 930, 968, 990, 1026, 1076, and 1092 nm; for lactose were at 734, 750, 786, 812, 908, 974, 982, and 1064 nm; and for total protein were at 776, 880, 902, 952, and 1034 nm.
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Affiliation(s)
- R Tsenkova
- Department of Environmental Information and Bio-Production Engineering, Kobe University, Japan
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Manahilov V, Atanassova S. Spatiotemporal impulse response and cortical magnification. Vision Res 1998; 38:1119-28. [PMID: 9666971 DOI: 10.1016/s0042-6989(97)00249-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 02/08/2023]
Abstract
According to a model of the spatiotemporal weighting function (Manahilov, V. Spatiotemporal visual response at suprathreshold stimuli. Vision Research, 1995, 35, 227-237; and Triphasic temporal impulse responses and Mach bands in time. Vision Research, 38, 447-458) the waveform of the temporal-impulse response and the cortical spread of the spatial-impulse response should not depend on the retinal site of stimulation. To verify these model predictions, the spatiotemporal responses to brief near-threshold lines presented in the fovea and the near retinal periphery were studied. The effect of an inducing stimulus on the threshold for pattern detection of a test stimulus was measured, assuming that the pattern-detection threshold was determined by the test peak response. The spatial spread of the line response expressed in visual-field units was increased with eccentricity. The temporal-impulse responses to foveal and peripheral stimuli were similar. The model of the weighting function was used to evaluate the relative magnification factor for the retinal location tested. The calculated cortical spatial-impulse responses did not depend on the stimulation site. The data obtained are in line with the cortical magnification theory of peripheral vision.
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Affiliation(s)
- V Manahilov
- Institute of Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
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Atanassova S, Valkov V, Slavov S, Batchvarova R. A Physiological Approach for Analysing Transgenic and Original Tobacco Cultivars with Respect of OrobancheSpp. Control. BIOTECHNOL BIOTEC EQ 1998. [DOI: 10.1080/13102818.1998.10818986] [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: 10/25/2022] Open
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Dragoeva A, Atanassov I, Jankulova M, Atanassova S, Atanassov A. Asymmetric Somatic Hybridization Between N.tabacum and N.sanderae: Transfer of Tomato Spotted Wilt Virus Resistance. BIOTECHNOL BIOTEC EQ 1997. [DOI: 10.1080/13102818.1997.10818910] [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: 10/25/2022] Open
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Atanassova S, Pavlov D, Todorov N. Estimation of chemical composition, net energy
and protein value of lucerne by NIRS
and by regression equation based of the days
of vegetation or the accumulated temperature. J Anim Feed Sci 1994. [DOI: 10.22358/jafs/69846/1994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gutzow I, Atanassova S, Budevsky G, Neykov K. Solubility, inhibited growth and dissolution kinetics of calcium oxalate crystals in solutions, containing hippuric acid. Urol Res 1993; 21:181-5. [PMID: 8342252 DOI: 10.1007/bf00590034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An analysis of crystal growth and dissolution of slightly soluble salts in physiological solutions in the presence of complexing ions was carried out, simulating conditions typical in human urine. It was found that hippuric acid, a normal physiological constituent of urine, acts at increased concentrations as a dissolving agent with respect to calcium oxalate (CaOx) and CaOx calculi. The kinetics of dissolution of crystalline CaOx calculi in physiological solutions containing hippuric acid at different concentrations were studied, using the change in the Archimedean weight of samples immersed in the solution. Analysis of the experimental results enabled the determination of the increased solubility of CaOx in the presence of hippuric acid and the quantitative characterization of this substance as a new and promising agent for dissolving CaOx calculi in human urine. The possible effect of hippuric acid as a natural regulator of CaOx supersaturation and crystallization in human and mammalian urine is also discussed.
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Affiliation(s)
- I Gutzow
- Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia
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Gutzow I, Atanassova S, Budevsky G. Kinetics of Dissolution of Calcium Oxalate Calculi in Physiological Solutions Containing Hippuric Acid. Cryst Res Technol 1991. [DOI: 10.1002/crat.2170260504] [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] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yomtov M, Trifonova A, Atanassova S, Tekelieva R, Topalova V. [Immunochemical studies on an antigen discovered in some enterobacteriaceae]. Zentralbl Bakteriol Orig A 1972; 222:484-6. [PMID: 4145165] [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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Atanassova S, Topalova V, Yomtov M. [Immunological investigations on E. coli strains related to Shigellae]. Zentralbl Bakteriol Orig A 1972; 221:30-7. [PMID: 4145104] [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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