Dr. Yordan Kostov Profile

Dr. Yordan Kostov

Research Professor at Univ of Maryland Baltimore County

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Author

Publications (10)

Proceedings Article | 24 April 2017 Presentation

Distinguishing between whole cells and cell debris using surface plasmon coupled emission (Conference Presentation)

Muhammad Talukder, Curtis Menyuk, Yordan Kostov

Proceedings Volume 10068, 100680D (2017) https://doi.org/10.1117/12.2250342

KEYWORDS: Surface plasmons, Life sciences, Fluorescent markers, Cameras, Digital imaging, Biological research, Tissues, Current controlled current source

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Proceedings Article | 17 May 2016 Paper

Optical sensor for rapid microbial detection

Mustafa Al-Adhami, Dagmawi Tilahun, Govind Rao, Yordan Kostov

Proceedings Volume 9862, 986207 (2016) https://doi.org/10.1117/12.2224132

KEYWORDS: Microfluidics, Contamination, Luminescence, Optical sensors, Photodiodes, Environmental sensing, Fluorometers, Light emitting diodes, Fluorescence spectroscopy, Polymethylmethacrylate

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Proceedings Article | 13 May 2016 Paper

Modelling and implementation of a fixed-length-extension to measure fluorescent intensity in bioprocesses using an optical sensor

Neha Sardesai, Mustafa Al-Adhami, Govind Rao, Yordan Kostov

Proceedings Volume 9863, 98630J (2016) https://doi.org/10.1117/12.2221931

KEYWORDS: Optical sensors, Proteins, Modeling, Luminescence, Fluorescent proteins, Optical fibers, Green fluorescent protein, Molecules, Optical spheres, Sensors

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Proceedings Article | 13 May 2015 Paper

Universal optical platform for monitoring of bioprocess variables

Neha Sardesai, Govind Rao, Yordan Kostov

Proceedings Volume 9486, 94860P (2015) https://doi.org/10.1117/12.2179721

KEYWORDS: Sensors, Calibration, Green fluorescent protein, Light emitting diodes, Visualization, Human-machine interfaces, Oxygen, Phase shifts, Chemical fiber sensors, Optical sensors

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Proceedings Article | 13 May 2015 Paper

Global nuclear radiation monitoring using plants

Mohammad Islam, Carlos Romero-Talamas, Dan Kostov, Wanpeng Wang, Zhongchi Liu, Daniel Hussey, Eli Baltic, David Jacobson, Jerry Gu, Fow-Sen Choa

Proceedings Volume 9486, 94860S (2015) https://doi.org/10.1117/12.2177532

KEYWORDS: Luminescence, Nuclear radiation, Environmental sensing, Spectroscopy, Gamma radiation, Data modeling, Bismuth, Crystals, Heat flux, Soil contamination

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Publisher’s Note: This paper, originally published on 5/13/2015, was replaced with a corrected/revised version on 7/1/2015. If you downloaded the original PDF but are unable to access the revision, please contact SPIE Digital Library Customer Service for assistance.

Plants exhibit complex responses to changes in environmental conditions such as radiant heat flux, water quality, airborne pollutants, soil contents. We seek to utilize the natural chemical and electrophysiological response of plants to develop novel plant-based sensor networks. Our present work focuses on plant responses to high-energy radiation – with the goal of monitoring natural plant responses for use as benchmarks for detection and dosimetry. For our study, we selected a plants cactus, Arabidopsis, Dwarf mango (pine), Euymus and Azela. We demonstrated that the ratio of Chlorophyll a to Chlorophyll b of the leaves has changed due to the exposure gradually come back to the normal stage after the radiation die.

We used blue laser-induced blue fluorescence-emission spectra to characterize the pigment status of the trees. Upon blue laser excitation (400 nm) leaves show a fluorescence emission in the red spectral region between 650 and 800nm (chlorophyll fluorescence with maxima near 690nm and 735 nm). Sample tree subjects were placed at a distance of 1m from NIST-certified 241AmBe neutron source (30 mCi), capable of producing a neutron field of about 13 mrem/h. This corresponds to an actual absorbed dose of ~ 1 mrad/h.

Our results shows that all plants are sensitive to nuclear radiation and some take longer time to recover and take less. We can use their characteristics to do differential detection and extract nuclear activity information out of measurement results avoid false alarms produced environmental changes. Certainly the ultimate verification can be obtained from genetic information, which only need to be done when we have seen noticeable changes on plant optical spectra, mechanical strength and electrical characteristics.

Proceedings Article | 8 March 2013 Paper

Closing a Venus Flytrap with electrical and mid-IR photon stimulations

David Eisen, Douglas Janssen, Xing Chen, Fow-Sen Choa, Dan Kostov, Jenyu Fan

Proceedings Volume 8565, 85655I (2013) https://doi.org/10.1117/12.2005351

KEYWORDS: Electrodes, Resistance, Venus, Action potentials, Mid-IR, Neurons, Signal generators, Absorption, Tissue optics, Tissues

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Proceedings Article | 9 February 2012 Paper

Neuron absorption study and mid-IR optical excitations

Dingkai Guo, Xing Chen, Shilpa Vadala, Jennie Leach, Yordan Kostov, William Bewley, Chul-Soo Kim, Mijin Kim, Chadwick Canedy, Charles Merritt, Igor Vurgaftman, Jerry Meyer, Fow-Sen Choa

Proceedings Volume 8207, 82075O (2012) https://doi.org/10.1117/12.909561

KEYWORDS: Neurons, Absorption, Mid-IR, Quantum cascade lasers, Visual optics, Visualization, Sensors, Brain, Human-machine interfaces, Semiconductor lasers

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Proceedings Article | 19 February 2009 Paper

Energy transfer-based biosensing of protease activity measured using an electroluminescent platform

Kim Sapsford, Steven Sun, Jesse Francis, Yordan Kostov, Avraham Rasooly, Dorothy Farrell, Hedi Mattoussi, Igor Medintz

Proceedings Volume 7167, 71670X (2009) https://doi.org/10.1117/12.809301

KEYWORDS: Fluorescence resonance energy transfer, Sensors, Luminescence, Biosensing, Electroluminescence, Charge-coupled devices, Quantum dots, Semiconductors, Medicine, Bandpass filters

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