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A photoconversion model for full spectral programming and multiplexing of optogenetic systems
EJ Olson, CN Tzouanas, JJ Tabor - Molecular Systems Biology, 2017 Abstract Optogenetics combines externally applied light signals and genetically engineered photoreceptors to control cellular processes with unmatched precision. Here, we develop a mathematical model of...
A toast to spectroscopy: How Compact Spectrometers are used in ethanol product research
Alcoholic beverages seem like a simple concept at first: take something sugary, throw in some yeast, and ta da! The sugars are fermented into ethanol. But the reality is more complex, even for mass produced products like Budweiser and Charles Shaw. For example, wine...
Diverse medical technologies: How Compact Spectrometers are being used to develop health-related methods and devices
Earlier, I wrote a piece about how StellarNet customers are using compact spectrometers to tackle the multi-headed beast that is cancer. While cancer is a large problem, it is but one of many in the healthcare industry. Diseases need to be understood, treatments need...
Spectroscopy Lab Experiments – Using Raman Spectroscopy to Detect Art Forgeries
In the previous experiment, you were introduced to Raman spectroscopy. This week you will explore how Raman spectroscopy can be used to solve real-world problems. You will use Raman spectroscopy to determine the validity of two paintings – one painting is a forgery...
How Compact Spectrometers are being used in Environmental Research: Cleaning Up Our Messes
Modern technological advances have made our lives easier – from pharmaceuticals to help us stay healthy, to pesticides that allow greater crop yield – at least in the short term. But, what happens to these compounds once we are done using them? Many of them end up in...
How Compact Spectrometers are being used in Cancer Research: Approaches to a Multifaceted Problem
Every week, it seems like another friend or family member is diagnosed with cancer. The American Cancer Society predicts that 1,688,780 people will be diagnosed with cancer and 600,920 people will die from cancer in the US in 2017. This problem isn’t limited to the...
Spectrometer Application Note: How do Different Light Sources Affect Crops?
For millennia, farmers have been at the mercy of the sun, depending on it to grow quality crops. Then came metal halide lamps and greenhouses to create artificial sun and summer. Now, with technologies such as LEDs, crops can be grown with tailored spectral...
Developing of DLI(Daily Light Integral) and Spectrum Control Systems for Scientific Cultivation in Agriculture
International Journal of Agriculture and Forestry Science (IJAgFoS) Y ÖZDEMİR, H Demirel, YE Yıldırım Abstract: This study presents a DLI (Daily Light Integral) and Spectrum-Based Scientific Cultivation Control System (DAS) Development, Design and Application of...
Photodegradation of the neurotoxicant methylmercury (MeHg) in Swedish lakes
TG Hilmarsson Methylmercury (MeHg) is a potent neurotoxin which has gained special attention in recent years for its ability to bioaccumulate in organisms and biomagnify through the food chain of aquatic ecosystems. It can have a severe impact on human health and even...
Light distribution in air-supported pneumatic structures: Comparison of experimental and computer calculated daylight factors
G Zrim, M Mihelčič, LS Perše, B Orel, B Simončič… - Building and Environment, 2017 Abstract This study examines daylight distribution and illumination levels with daylight factors (DFs) inside an air-supported (pneumatic) structure (50.0 m long, 25.0 m wide and 11.0 m...
Technical Note – Vibrational Spectroscopy: Infrared vs. Raman
Vibrational spectroscopies are integral in analyzing some of the most fundamentally important processes in physical chemistry: molecular vibrations. While there are many different experimental techniques used to analyze those vibrations, most are variations of the...
A Core-Multiple Shell Nanostructure Enabling Concurrent Upconversion and Quantum Cutting for Photon Management
W Shao, G Chen, TY Ohulchanskyy, C Yang, H Agren… - Nanoscale, 2017 Photon management enables the manipulation of the number of input photons by conversion of two or more light quanta into one (upconversion) or vice versa (quantum cutting). Simultaneous realization of...
In vitro Demonstration of Cancer Inhibiting Properties from Stratified Self-Organized Micro-Discharge Plasma-Liquid Interface
Z Chen, S Zhang, I Levchenko, II Beilis, M Keidar - arXiv preprint arXiv:1701.01655, 2017 Experiments have revealed a nontrivial cancer-inhibiting capability of liquid media treated by the plasma jet capable of forming thinly stratified self-organized patterns at a...
A high sensitivity compact gas concentration sensor using UV light and charge amplifier circuit
H Ishii, M Nagase, N Ikeda, Y Shiba, Y Shirai, R Kuroda… - SENSORS, 2016 IEEE, 2016 A high sensitivity compact gas concentration sensor based on the ultraviolet (UV) light absorption spectrophotometry employing charge amplifier circuit is developed in this work as...
Highly responsive and broadband photodetectors based on WS2–graphene van der Waals epitaxial heterostructures
C Lan, C Li, S Wang, T He, Z Zhou, D Wei, H Guo… - Journal of Materials …, 2017 Van der Waals heterostructures built from two-dimensional (2D) materials have attracted wide attention because of their fascinating electrical and optoelectronic properties. Here, we...
Efficient Flexible Organic/Inorganic Hybrid Perovskite Light-Emitting Diodes Based on Graphene Anode
HK Seo, H Kim, J Lee, MH Park, SH Jeong, YH Kim… - Advanced Materials, 2017 Highly efficient organic/inorganic hybrid perovskite light-emitting diodes (PeLEDs) based on graphene anode are developed for the first time. Chemically inert graphene avoids quenching of...
Developmental effects of visual environment on species-assortative mating preferences in Lake Victoria cichlid fish
DS Wright, N Demandt, JT Alkema, O Seehausen… - Journal of Evolutionary …, 2016 Local adaptation can be a potent force in speciation, with environmental heterogeneity leading to niche specialization and population divergence. However, local adaption often requires...
Simultaneous Depth and Spectral Imaging with A Cross-Modal Stereo System
L Wang, Z Xiong, G Shi, W Zeng, F Wu - IEEE Transactions on Circuits and Systems …, 2016 This letter presents a novel approach for simultaneous depth and spectral imaging with a cross-modal stereo system. Two images of the target scene are captured at the same time:...
Chemically Roughened Solid Silver: A Simple, Robust and Broadband SERS Substrate
Shavini Wijesuriya, Krishna Burugapalli, Ruth Mackay, Godwin Chukwuebuka Ajaezi and Wamadeva Balachandran Surface-enhanced Raman spectroscopy (SERS) substrates manufactured using complex nano-patterning techniques have become the norm. However, their cost of...
Light competition within dense plant stands and their subsequent growth under illumination with different red:far-red ratios
T Shibuya, S Kishigami, S Takahashi, R Endo, Y Kitaya - Scientia Horticulturae, 2016 We evaluated the dynamics of light competition within dense cucumber (Cucumis sativus L.) plant stands and its relationship to subsequent growth under illumination with different red...
Multi-wavelength Pulse Amplitude Modulated fluorometry (Phyto-PAM) reveals differential effects of ultraviolet radiation on the photosynthetic physiology of phytoplankton pigment groups
L Beecraft, SB Watson, REH Smith - Freshwater Biology, 2016 The effects of UV-B, UV-A and PAR on the photochemistry of phytoplankton from Hamilton Harbour, Lake Ontario, were measured to assess how well a multi-wavelength Pulse Amplitude Modulated fluorometer...
Enhancing cold atmospheric plasma treatment of cancer cells by static magnetic field
X Cheng, K Rajjoub, A Shashurin, D Yan, JH Sherman… - Bioelectromagnetics, 2016 It has been reported since late 1970 that magnetic field interacts strongly with biological systems. Cold atmospheric plasma (CAP) has also been widely studied over the past few decades in...
Non-equilibrium plasma prevention of Schistosoma japonicum transmission
Xing-Quan, Wang Feng-Peng WangWei Chen, Jun Huang Kateryna Bazaka, & Kostya (Ken) Ostrikov Schistosoma japonicum is a widespread human and animal parasite that causes intestinal and hepatosplenic schistosomiasis linked to colon, liver and bladder cancers, and...
Perfect Light Absorption in Ultra-thin Silicon Optical Nanocavity and its Application for Color Filters
SS Mirshafieyan, TS Luk, J Guo - Laser Science, 2016 We investigated perfect light absorption in silicon optical nanocavity comprising of ultrathin aluminum and silicon films deposited on an aluminum surface. The thickness of the silicon film cavity is 1/18 of the...
One-step hydrothermal synthesis of porous 3D reduced graphene oxide/TiO 2 aerogel for carbamazepine photodegradation in aqueous solution
Mohsin Nawaz, Waheed Miran, Jiseon Jang, Dae Sung Lee In this study, the three-dimensional (3D) reduced graphene oxide/TiO2 (RGOT) aerogel was synthesized by a facile one-step hydrothermal treatment, and its photocatalytic efficiency was evaluated in the...
Generation of high-intensity spectral supercontinuum of more than two octaves in a water jet
A. N. Tcypkin, S. E. Putilin, M. V. Melnik, E. A. Makarov, V. G. Bespalov, and S. A. Kozlov In this paper, we demonstrate experimentally for the first time (to our knowledge) the generation of spectral supercontinuum (SC) of more than two octaves with high intensity...
Anthocyanin Production Using Rough Bluegrass Treated with High-Intensity Light
DP Petrella, JD Metzger, JJ Blakeslee, EJ Nangle… - HortScience, 2016 Anthocyanins are plant pigments that are in demand for medicinal and industrial uses. However, anthocyanin production is limited due to the harvest potential of the species currently used as...
Application Note – Low Cost & Portable Raman Spectrometer Analysis of Pharmaceuticals
Raman spectroscopy is a valuable tool for quickly inspecting solid, liquid, and powder pharmaceuticals and pharmaceutical precursors. The versatility and affordability of modern Raman spectrometers makes them a vital component in most labs and pharmaceutical...
Photosynthetic performance of two Nannochloropsis spp. under different filtered light spectra
A Vadiveloo, NR Moheimani, NR Kosterink… - Algal Research, 2016 The integration of spectrally selective photovoltaic filters together with microalgae cultivation systems have been previously shown to improve both production efficiency and economics. This means that...
Cryostat System for Spacecraft Materials Testing
J Dekany - 2016 An existing space environment simulation test chamber used in the study of electron emission, sample charging and discharge, electrostatic discharge and arcing, electron transport, and luminescence of spacecraft materials now has extended temperature...
Manipulating Sensory and Phytochemical Profiles of Greenhouse Tomatoes Using Environmentally Relevant Doses of Ultraviolet Radiation
Michael P. Dzakovich, Mario G. Ferruzzi, and Cary A. Mitchell Fruits harvested from off-season, greenhouse-grown tomato plants have a poor reputation compared to their in-season, garden-grown counterparts. Presently, there is a gap in knowledge with regard to the role...
The influence of sodium nanoparticles formation on luminescent properties of fluorophosphate glasses containing molecular clusters and quantum dots of lead selenide
ZO Lipatova, EV Kolobkova, AI Sidorov, NV Nikonorov - Optics and Spectroscopy, 2016 The influence of sodium nanoparticles and secondary heat treatment conditions on the spectralluminescent characteristics of fluorophosphate glasses with PbSe molecular clusters and...
Quality evaluation of green tea leaf cultured under artificial light condition using gas chromatography/mass spectrometry
S Miyauchi, T Yonetani, T Yuki, A Tomio, T Bamba… - Journal of Bioscience and …, 2016 For an experimental model to elucidate the relationship between light quality during plant culture conditions and plant quality of crops or vegetables, we cultured tea plants...
Application Note- Fluorescence Spectroscopy of Rocks and Minerals
What is Fluorescence Spectroscopy and Why is it Important? Light interacts with matter in a few basic ways: reflectance, transmission, and absorption. In some cases when light is absorbed it will be re-emitted as light at a longer wavelength. The most obvious example...
Three-dimensional printed miniaturized spectral system for collagen fluorescence lifetime measurements
L Zou, R Koslakiewicz, M Mahmoud, M Fahs, R Liu… - Journal of Biomedical Optics, 2016 Abstract. Various types of collagens, e.g., type I and III, represent the main load-bearing components in biological tissues. Their composition changes during processes such as...
The LTCC device for miniature plasma generators characterization
J Macioszczyk, K Malecha, LJ Golonka, J Atkinson… - Microelectronics …, 2016 Purpose The purpose of this paper is a presentation of a miniature vertical DBD (dielectric barrier discharge) plasma generators. The presented devices, with sub- and superstrate, was made...
Detection of protein deposits using NIR spectroscopy
J Šakota Rosić, J Munćan, I Mileusnić, B Kosić, L Matija - Soft Materials, 2016 The aim of this study was to determine if it is possible to distinguish between the groups of spoiled and unspoiled soft contact lenses using near-infrared spectroscopy and new analytical...
Semitransparent Organic Light Emitting Diodes with Bidirectionally Controlled Emission
C Bronnbauer, A Osvet, CJ Brabec, K Forberich - ACS Photonics, 2016 Semitransparent OLEDs are a candidate for large-area eco-friendly light sources that can be integrated into building facades, suggesting colorful windows that become luminescent if the OLED is...
Short-term UV-B radiation affects photosynthetic performance and antioxidant gene expression in highbush blueberry leaves
C Inostroza-Blancheteau, P Acevedo, R Loyola… - Plant Physiology and …, 2016 The impact of increased artificial UV-B radiation on photosynthetic performance, antioxidant and SOD activities and molecular antioxidant metabolism responses in leaves of two highbush...
Multispectral flow cytometry: The consequences of increased light collection
K Feher, K von Volkmann, J Kirsch, A Radbruch… - Cytometry Part A, 2016 In recent years, multispectral flow cytometry systems have come to attention. They differ from conventional flow cytometers in two key ways: a multispectral flow cytometer collects the full...