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Journal articles on the topic 'Pigment spectral responses'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

SUN, YANG, and STEVEN K. SHEVELL. "Rayleigh matches in carriers of inherited color vision defects: The contribution from the third L/M photopigment." Visual Neuroscience 25, no. 3 (2008): 455–62. http://dx.doi.org/10.1017/s0952523808080346.

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The mother or daughter of a male with an X-chromosome-linked red/green color defect is an obligate carrier of the color deficient gene array. According to the Lyonization hypothesis, a female carrier's defective gene is expressed and thus carriers may have more than two types of pigments in the L/M photopigment range. An open question is how a carrier's third cone pigment in the L/M range affects the postreceptoral neural signals encoding color. Here, a model considered how the signal from the third pigment pools with signals from the normal's two pigments in the L/M range. Three alternative a

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Tsai, Tina I., Jenny Atorf, Maureen Neitz, Jay Neitz, and Jan Kremers. "Rod- and cone-driven responses in mice expressing human L-cone pigment." Journal of Neurophysiology 114, no. 4 (2015): 2230–41. http://dx.doi.org/10.1152/jn.00188.2015.

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The mouse is commonly used for studying retinal processing, primarily because it is amenable to genetic manipulation. To accurately study photoreceptor driven signals in the healthy and diseased retina, it is of great importance to isolate the responses of single photoreceptor types. This is not easily achieved in mice because of the strong overlap of rod and M-cone absorption spectra (i.e., maxima at 498 and 508 nm, respectively). With a newly developed mouse model ( Opn1lwLIAIS) expressing a variant of the human L-cone pigment (561 nm) instead of the mouse M-opsin, the absorption spectra are

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3

Xianjun Zhang. "Development and Application of Cryogenic Optical Microscopy in Photosynthesis." Acta Physica Sinica 73, no. 21 (2024): 0. http://dx.doi.org/10.7498/aps.73.20241072.

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Efficient photosynthesis reaction thanks to the flexible energy regulation of two important pigment-protein complexes photosystem II (PSII) and photosystem I (PSI). Cryogenic spectral microscopy provides information about the spatial distribution and physiological functional states of photosynthetic components in photosynthetic organisms. Under low temperatures, the uphill energy transfer between pigments is efficiently suppressed so that the temperature-dependent PSI can be well analyzed. Therefore, a cryogenic spectral microscope allows us to discuss the physiological events surrounding PSII

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AKULA, JAMES D., ARKADY L. LYUBARSKY, and FRANK NAARENDORP. "The sensitivity and spectral identity of the cones driving the b-wave of the rat electroretinogram." Visual Neuroscience 20, no. 2 (2003): 109–17. http://dx.doi.org/10.1017/s0952523803202029.

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In the retina of rat, cones make up ∼0.85% of the photoreceptor population: 93% of these cones contain a midwave-sensitive pigment, the rest expresses a short-wave-sensitive pigment (Szel & Rohlich, 1992). We used normal adult Long Evans rats to determine the spectral sensitivity of the cone-driven electroretinogram (ERG) b-wave and its absolute sensitivity at λmax of the cone pigments. ERGs were recorded at the cornea of anesthetized animals under dark- and light-adapted conditions. Rod responses were suppressed by steady rod-saturating orange backgrounds and/or by a flashed “white” backg

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Baden, T., and D. Osorio. "The Retinal Basis of Vertebrate Color Vision." Annual Review of Vision Science 5, no. 1 (2019): 177–200. http://dx.doi.org/10.1146/annurev-vision-091718-014926.

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The jawless fish that were ancestral to all living vertebrates had four spectral cone types that were probably served by chromatic-opponent retinal circuits. Subsequent evolution of photoreceptor spectral sensitivities is documented for many vertebrate lineages, giving insight into the ecological adaptation of color vision. Beyond the photoreceptors, retinal color processing is best understood in mammals, especially the blueONsystem, which opposes short- against long-wavelength receptor responses. For other vertebrates that often have three or four types of cone pigment, new findings from zebr

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Nakajima, Tetsuya, Mari Kobayashi, Masato Fuji, et al. "Metabolome Profiling and Predictive Modeling of Dark Green Leaf Trait in Bunching Onion Varieties." Metabolites 15, no. 4 (2025): 226. https://doi.org/10.3390/metabo15040226.

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Background: The dark green coloration of bunching onion leaf blades is a key determinant of market value, nutritional quality, and visual appeal. This trait is regulated by a complex network of pigment interactions, which not only determine coloration but also serve as critical indicators of plant growth dynamics and stress responses. This study aimed to elucidate the mechanisms regulating the dark green trait and develop a predictive model for accurately assessing pigment composition. These advancements enable the efficient selection of dark green varieties and facilitate the establishment of

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Millie, David F., Daphne A. Ingram, and Christopher P. Dionigi. "PIGMENT AND PHOTOSYNTHETIC RESPONSES OF OSCILLATORIA AGARDHII (CYANOPHYTA) TO PHOTON FLUX DENSITY AND SPECTRAL QUALITY1." Journal of Phycology 26, no. 4 (1990): 660–66. http://dx.doi.org/10.1111/j.0022-3646.1990.00660.x.

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8

Liang, Zu-Long, Tian-Hao Zhang, Jacob Muinde, et al. "Ultrastructure and Spectral Characteristics of the Compound Eye of Asiophrida xanthospilota (Baly, 1881) (Coleoptera, Chrysomelidae)." Insects 15, no. 7 (2024): 532. http://dx.doi.org/10.3390/insects15070532.

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In this study, the morphology and ultrastructure of the compound eye of Asi. xanthospilota were examined by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), micro-computed tomography (μCT), and 3D reconstruction. Spectral sensitivity was investigated by electroretinogram (ERG) tests and phototropism experiments. The compound eye of Asi. xanthospilota is of the apposition type, consisting of 611.00 ± 17.53 ommatidia in males and 634.8 0 ± 24.73 ommatidia in females. Each ommatidium is composed of a subplano-convex cornea, an acone consisting of four cone cells,

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Manian, Vidya, Jairo Orozco-Sandoval, and Victor Diaz-Martinez. "Detection of Genes in Arabidopsis thaliana L. Responding to DNA Damage from Radiation and Other Stressors in Spaceflight." Genes 12, no. 6 (2021): 938. http://dx.doi.org/10.3390/genes12060938.

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Ionizing radiation present in extraterrestrial environment is an important factor that affects plants grown in spaceflight. Pearson correlation-based gene regulatory network inferencing from transcriptional responses of the plant Arabidopsis thaliana L. grown in real and simulated spaceflight conditions acquired by GeneLab, followed by topological and spectral analysis of the networks is performed. Gene regulatory subnetworks are extracted for DNA damage response processes. Analysis of radiation-induced ATR/ATM protein–protein interactions in Arabidopsis reveals interaction profile similaritie

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PANKHURST, N. W., and J. C. MONTGOMERY. "Visual Function in Four Antarctic Nototheniid Fishes." Journal of Experimental Biology 142, no. 1 (1989): 311–24. http://dx.doi.org/10.1242/jeb.142.1.311.

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Visual function was investigated in the antarctic fish Pagothenia borchgrevinki (Boulenger), Trematomus bernacchii Boulenger, T. centronotus Regan and T. hansoni Boulenger. All Trematomus species have large anterior aphakic spaces (indicating a forward feeding vector), whereas Pagothenia does not. Pagothenia and T. hansoni, which both feed in the water column, lack the corneal iridescence displayed by T. bernacchii and T. centronotus. This is thought to relate to the importance of downwelling light for image formation in Pagothenia and T. hansoni. Absolute sensitivity thresholds to white and m

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He, Yong, Yong He, Yiying Zhao, et al. "Determination of ß-Carotene and Lutein in Green Tea Using Fourier Transform Infrared Spectroscopy." Transactions of the ASABE 62, no. 1 (2019): 75–81. http://dx.doi.org/10.13031/trans.12839.

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Abstract. The feasibility of using Fourier transform infrared (FT-IR) spectroscopy combined with chemometrics to determine the ß-carotene and lutein contents in green tea was investigated in this study. The relationship between pigment contents and spectral responses was explored by partial least squares (PLS), least squares support vector machine (LS-SVM), and extreme learning machine (ELM) methods. Next, 30 and 29 effective wavenumbers (EWs) for ß-carotene and lutein, respectively, were selected according to the weighted regression coefficients of the PLS regression models, and simplified de

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Lozano-Castellanos, Luisa F., Giuseppina Pennisi, Luis Manuel Navas-Gracia, et al. "Physiological and Phytochemical Responses of Calendula officinalis L. to End-of-Day Red/Far-Red and Green Light." Biology 14, no. 8 (2025): 935. https://doi.org/10.3390/biology14080935.

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Calendula officinalis L. is a widely used medicinal plant whose secondary metabolism and morphology are influenced by light. This study evaluated the effects of 2 and 4 h end-of-day (EOD) red/far-red (R:FR) and green (G) light on the growth, physiology, and phytochemical profile of hydroponically grown C. officinalis under a constant red/blue light background, compared with a red/blue control without EOD treatment. Morphological, physiological (gas exchange, chlorophyll fluorescence), biochemical (chlorophyll, anthocyanin), and chemical composition (attenuated total reflectance-Fourier transfo

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Mevy, Jean-Philippe, Charlotte Biryol, Marine Boiteau-Barral, and Franco Miglietta. "The Optical Response of a Mediterranean Shrubland to Climate Change: Hyperspectral Reflectance Measurements during Spring." Plants 11, no. 4 (2022): 505. http://dx.doi.org/10.3390/plants11040505.

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Remote sensing techniques in terms of monitoring plants’ responses to environmental constraints have gained much attention during recent decades. Among these constraints, climate change appears to be one of the major challenges in the Mediterranean region. In this study, the main goal was to determine how field spectrometry could improve remote sensing study of a Mediterranean shrubland submitted to climate aridification. We provided the spectral signature of three common plants of the Mediterranean garrigue: Cistus albidus, Quercus coccifera, and Rosmarinus officinalis. The pattern of these s

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Pál, Magda, Kamirán Áron Hamow, Altafur Rahman, et al. "Light Spectral Composition Modifies Polyamine Metabolism in Young Wheat Plants." International Journal of Molecular Sciences 23, no. 15 (2022): 8394. http://dx.doi.org/10.3390/ijms23158394.

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Although light-emitting diode (LED) technology has extended the research on targeted photomorphogenic, physiological, and biochemical responses in plants, there is not enough direct information about how light affects polyamine metabolism. In this study, the effect of three spectral compositions (referred to by their most typical characteristic: blue, red, and the combination of blue and red [pink] lights) on polyamine metabolism was compared to those obtained under white light conditions at the same light intensity. Although light quality induced pronounced differences in plant morphology, pi

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Kabashnikova, Luidmila F., Irina N. Domanskaya, Lyubov V. Pashkevich, Irina A. Dremuk, Hanna V. Martysiuk, and Olga V. Molchan. "Influence of light intensity and its spectral composition on photosynthetic activity of cucumber Cucumis sativus under fusarium wilt." Experimental Biology and Biotechnology, no. 3 (November 15, 2022): 39–52. http://dx.doi.org/10.33581/2957-5060-2022-3-39-52.

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The responses of cucumber chloroplasts of the Kustovoi variety formed under lighting of different intensity (6000 and 11 000 lx) or under LED lighting with a predominance of red light and far red light to infection with fungus Fusarium oxysporum were studied. The amount of chlorophylls and carotenoids in chloroplasts formed at low light increased in 72 h after infection, and at high light a significant increase in pigment catabolism was observed. Under fusarium wilt, the violaxanthin cycle was not involved in the conditions of the studied light range, and the photochemical activity of chloropl

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Mazur, Maja, Maja Matoša Kočar, Antun Jambrović, et al. "Crop-Specific Responses to Cold Stress and Priming: Insights from Chlorophyll Fluorescence and Spectral Reflectance Analysis in Maize and Soybean." Plants 13, no. 9 (2024): 1204. http://dx.doi.org/10.3390/plants13091204.

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This study aimed to investigate the impact of cold stress and priming on photosynthesis in the early development of maize and soybean, crops with diverse photosynthetic pathways. The main objectives were to determine the effect of cold stress on chlorophyll a fluorescence parameters and spectral reflectance indices, to determine the effect of cold stress priming and possible stress memory and to determine the relationship between different parameters used in determining the stress response. Fourteen maize inbred lines and twelve soybean cultivars were subjected to control, cold stress, and pri

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Gosselin, Nichole, Vasit Sagan, Matthew Maimaitiyiming, et al. "Using Visual Ozone Damage Scores and Spectroscopy to Quantify Soybean Responses to Background Ozone." Remote Sensing 12, no. 1 (2019): 93. http://dx.doi.org/10.3390/rs12010093.

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Remotely-sensed identification of ozone stress in crops can allow for selection of ozone resistant genotypes, improving yields. This is critical as population, food demand, and background tropospheric ozone are projected to increase over the next several decades. Visual scores of common ozone damage have been used to identify ozone-stress in bio-indicator plants. This paper evaluates the use of a visual scoring metric of ozone damage applied to soybeans. The scoring of the leaves is then combined with hyperspectral data to identify spectral indices specific to ozone damage. Two genotypes of so

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18

Maes, Danae M., August Finke, Chuck R. Smallwood, J. Bryce Ricken, Jerilyn A. Timlin, and Anne M. Ruffing. "Cellular Photosynthetic Pigment and Structural Change in Festuca arundinacea (Tall Fescue) after Exposure to Acute and Chronic Chromium and Copper Stress." Advances in Environmental and Engineering Research 3, no. 2 (2022): 1. http://dx.doi.org/10.21926/aeer.2202025.

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Expanded industrial globalization has resulted in the release of high concentrations of heavy metals into environmental water sources and soils. Phytoremediation may help to remove these heavy metals from contaminated soils. Tall fescue (Festuca arundinacea Shreb.) exhibits phytoremediation potential due to its endurance and high stress tolerances. Here, we report photochemical and structural responses in tall fescue to acute and chronic doses of heavy metals, copper (Cu) and hexavalent chromium (Cr(VI)). Visual signs of stress and decreased photosynthetic yield measurements were detected for

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19

Matoša Kočar, Maja, Aleksandra Sudarić, Tomislav Duvnjak, and Maja Mazur. "Soybean Genotype-Specific Cold Stress and Priming Responses: Chlorophyll a Fluorescence and Pigment-Related Spectral Reflectance Indices as Tools for Breeding." Agronomy 15, no. 2 (2025): 390. https://doi.org/10.3390/agronomy15020390.

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Early sowing to avoid stress later in the season is limited by low early spring temperatures and unpredictable cold spells within recommended sowing dates. To achieve successful crop production, it is essential to understand plant stress responses, enabling breeders and producers to better address climate change challenges. Researching genetic variability for cold stress is key to developing cold-tolerant crops. In response, a study investigating the effects of low-temperature treatment and cold priming in the early vegetative development on soybean biomass, chlorophyll a fluorescence (ChlF) a

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HARIYAMA, TAKAHIKO, V. BENNO MEYER-ROCHOW, and EISUKE EGUCHI. "Diurnal Changes in Structure and Function of the Compound Eye of Ligia Exotica (Crustacea, Isopoda)." Journal of Experimental Biology 123, no. 1 (1986): 1–26. http://dx.doi.org/10.1242/jeb.123.1.1.

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The ultrastructure of the retinula cells of Ligia exotica changes diurnally and in response to light/dark adaptation. At the low phase of electroretinogram (ERG) amplitude (at noon), the arrangement of microvilli is ordered and the rhabdom is of the open type. An irregular arrangement of microvilli appears at the high phase of ERG amplitude (at midnight), when the rhabdom is of the closed type. The pigment granules disperse at midnight and assemble at noon. A centrally positioned, spikeproducing eccentric cell is present in each ommatidium. Spectral response curves based on ERG measurements ha

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Olivier, Guillaume, Philippe Brabet, Nelly Pirot, et al. "SPACR Encoded by IMPG1 Is Essential for Photoreceptor Survival by Interplaying between the Interphotoreceptor Matrix and the Retinal Pigment Epithelium." Genes 13, no. 9 (2022): 1508. http://dx.doi.org/10.3390/genes13091508.

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Several pathogenic variants have been reported in the IMPG1 gene associated with the inherited retinal disorders vitelliform macular dystrophy (VMD) and retinitis pigmentosa (RP). IMPG1 and its paralog IMPG2 encode for two proteoglycans, SPACR and SPACRCAN, respectively, which are the main components of the interphotoreceptor matrix (IPM), the extracellular matrix surrounding the photoreceptor cells. To determine the role of SPACR in the pathological mechanisms leading to RP and VMD, we generated a knockout mouse model lacking Impg1, the mouse ortholog. Impg1-deficient mice show abnormal accum

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Dearry, A., and R. B. Barlow. "Circadian rhythms in the green sunfish retina." Journal of General Physiology 89, no. 5 (1987): 745–70. http://dx.doi.org/10.1085/jgp.89.5.745.

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We investigated the occurrence of circadian rhythms in retinomotor movements and retinal sensitivity in the green sunfish, Lepomis cyanellus. When green sunfish were kept in constant darkness, cone photoreceptors exhibited circadian retinomotor movements; rod photoreceptors and retinal pigment epithelium (RPE) pigment granules did not. Cones elongated during subjective night and contracted during subjective day. These results corroborate those of Burnside and Ackland (1984. Investigative Ophthalmology and Visual Science. 25:539-545). Electroretinograms (ERGs) recorded in constant darkness in r

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23

Wu, Huanyang. "Effect of Different Light Qualities on Growth, Pigment Content, Chlorophyll Fluorescence, and Antioxidant Enzyme Activity in the Red AlgaPyropia haitanensis(Bangiales, Rhodophyta)." BioMed Research International 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/7383918.

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Spectral light changes evoke different morphogenetic and photosynthetic responses that can vary among different algae species. The aim of this study is to investigate the photosynthetic characteristics of the red macroalgae grown under different spectrum environments. In this study,Pyropia haitanensiswere cultured under blue, red, and green LED and fluorescent tubes light. The growth rate, photopigment composition, chlorophyll fluorescence, and antioxidative enzymes activities in different light spectrums were investigated. The results revealed that growth rate was significantly higher in the

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Urrea-Victoria, Tatiana, Emiliano Fulda-Graue, Miguel A. Quiroz-Reyes, et al. "Postoperative Multimodal Analysis in Successful Gas Displacement of a Submacular Hemorrhage." Case Reports in Ophthalmological Medicine 2021 (June 3, 2021): 1–7. http://dx.doi.org/10.1155/2021/5577826.

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In this report, we describe a case of timely gas vitrectomy to displace a moderate submacular hemorrhage from the submacular space without tPA, release vitreoretinal traction along the borders of a posterior retinal tear, and analyze postoperative multimodal imaging findings in a 34-year-old male patient whose right eye was injured by a stone. The patient underwent a successful nontissue plasminogen activator gas vitrectomy 3 days after the accident. A multimodal evaluation with spectral-domain optical coherence tomography (SD-OCT), 10-2 and 30-2 campimetry, microperimetry, multifocal electror

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Lund-Hansen, LC, I. Hawes, K. Hancke, et al. "Effects of increased irradiance on biomass, photobiology, nutritional quality, and pigment composition of Arctic sea ice algae." Marine Ecology Progress Series 648 (August 27, 2020): 95–110. http://dx.doi.org/10.3354/meps13411.

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Ice algae are key contributors to primary production and carbon fixation in the Arctic, and light availability is assumed to limit their growth and productivity. We investigated photo-physiological responses in sea ice algae to increased irradiance during a spring bloom in West Greenland. During a 14 d field experiment, light transmittance through sea ice was manipulated to provide 3 under-ice irradiance regimes: low (0.04), medium (0.08), and high (0.16) transmittances. Chlorophyll a decreased with elevated light availability relative to the control. Maximum dark-adapted photosynthetic effici

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Asner, Gregory P., Crawford Drury, Nicholas R. Vaughn, Joshua R. Hancock, and Roberta E. Martin. "Variability in Symbiont Chlorophyll of Hawaiian Corals from Field and Airborne Spectroscopy." Remote Sensing 16, no. 5 (2024): 732. http://dx.doi.org/10.3390/rs16050732.

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Corals are habitat-forming organisms on tropical and sub-tropical reefs, often displaying diverse phenotypic behaviors that challenge field-based monitoring and assessment efforts. Symbiont chlorophyll (Chl) is a long-recognized indicator of intra- and inter-specific variation in coral’s response to environmental variability and stress, but the quantitative Chl assessment of corals at the reef scale continues to prove challenging. We integrated field, airborne, and laboratory techniques to test and apply the use of reflectance spectroscopy for in situ and reef-scale estimation of Chl a and Chl

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Rajewicz, Paulina, Chao Zhang, Jon Atherton, et al. "Behind the Spatio-Temporal Variation in Spectral Chlorophyll Fluorescence of Boreal Species." ARPHA Conference Abstracts 8 (May 28, 2025): e149326. https://doi.org/10.3897/aca.8.e149326.

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Boreal forests constitute about one-third of all the global forest area (Brandt et al. 2013). Capturing a significant portion of global atmospheric CO2 (Beer et al. 2010, Thurner et al. 2016, Thurner et al. 2013), boreal forests play a key role in the global carbon cycle (Anav et al. 2015). However, monitoring photosynthetic activity in these forests is difficult with traditional greenness or vegetation indices, particularly due to the dominance of evergreen species and thus relatively little seasonal variation in greenness (Magney et al. 2019). Fortunately, emerging studies suggest that chlor

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Nelson, R., and H. Kolb. "A17: a broad-field amacrine cell in the rod system of the cat retina." Journal of Neurophysiology 54, no. 3 (1985): 592–614. http://dx.doi.org/10.1152/jn.1985.54.3.592.

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A17 amacrine cells of the cat retina have been penetrated with horseradish peroxidase (HRP)-filled microelectrodes and their light responses recorded. These cells depolarize in sustained fashion to steps of light. Viewed in retinal wholemounts, HRP-injected cells have a spokelike radiating splay of very fine dendrites (0.1 micron diam) passing diffusely through all strata of the inner plexiform layer (IPL) to run primarily in strata 4 and 5. There are as many as 1,000 large, regularly spaced beads borne on the 500- to 1,200-micron diameter dendritic field. Cell body sizes range from 9 to 13 mi

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Fabiani, Claudia, Marta Gambucci, Chiara Chiatti, Giulia Zampini, Loredana Latterini, and Anna Laura Pisello. "Towards field implementation of photoluminescence in the built environment for passive cooling and lighting energy efficiency." Applied Energy 324 (October 15, 2022): 119687. https://doi.org/10.1016/j.apenergy.2022.119687.

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Photoluminescent materials are widely considered crucial elements in sustainable lighting, and they are also gaining credit in passive cooling applications in buildings. In this study, we investigate different photoluminescent pigments, connecting their emission behavior to the specific afterglow color and evaluating their potential use as passive cooling and lighting energy-saving solutions. In particular, we analyze the spectral behavior of the selected pigments to obtain for the first time corrected luminescence spectral responses. The same materials are then characterized th

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Mahović Poljaček, Sanja, Maja Strižić Jakovljević, and Tamara Tomašegović. "Photochromic Responses and Stability of Functional Inks Applied on Sustainable Packaging Materials." Micro 4, no. 1 (2024): 33–48. http://dx.doi.org/10.3390/micro4010003.

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Photochromism refers to a reversible colour change induced by the irradiation of photochromic materials with ultraviolet (UV) or visible light that reverts to the original colour after the light source is removed. This effect arises from chemical transformations between two isomers with different absorption spectra, involving processes like proton transfer, chemical-bond formation, and isomerisation. These photochromic inks, appearing as crystalline powders with micro-sized particles, require dissolution in a suitable matrix to achieve the colour change. Photochromic inks are used in security,

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Jiang, Tianshu, Hao Guo, Lingpu Ge, Fumihiro Sassa, and Kenshi Hayashi. "Inkjet-Printed Localized Surface Plasmon Resonance Subpixel Gas Sensor Array for Enhanced Identification and Visualization of Gas Spatial Distributions from Multiple Odor Sources." Sensors 24, no. 20 (2024): 6731. http://dx.doi.org/10.3390/s24206731.

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The visualization of the spatial distributions of gases from various sources is essential to understanding the composition, localization, and behavior of these gases. In this study, an inkjet-printed localized surface plasmon resonance (LSPR) subpixel gas sensor array was developed to visualize the spatial distributions of gases and to differentiate between acetic acid, geraniol, pentadecane, and cis-jasmone. The sensor array, which integrates gold nanoparticles (AuNPs), silver nanoparticles (AgNPs), and fluorescent pigments, was positioned 3 cm above the gas source. Hyperspectral imaging was

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Zhang, Yawei, Guanhua Ren, Xiang Zhou, Lu Zhou, La Ta, and Xiaoqiang Su. "Research on red and green porcelain sherd of Bayi Kiln using terahertz time-domain spectroscopy and imaging." Japanese Journal of Applied Physics 60, no. 12 (2021): 122010. http://dx.doi.org/10.35848/1347-4065/ac38fc.

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Abstract Terahertz (THz) technology is particularly suitable for non-destructive detection of porcelain sherd due to the unique properties of non-ionizing, high penetration, and broad-spectrum. In this paper, we investigated the reflection characteristics of the pigments and sediments for red and green porcelain sherd of Bayi Kiln made in Shanxi province during the Jin Dynasty by terahertz time-domain spectroscopy (THz-TDS), obtaining the spectral responses of different components. Furthermore, Raman spectroscopy was used as a complementary technique to complete the qualitative analysis of the

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Szechyńska-Hebda, Magdalena, Ryszard Hołownicki, Grzegorz Doruchowski, et al. "Application of Hyperspectral Imaging for Early Detection of Pathogen-Induced Stress in Cabbage as Case Study." Agronomy 15, no. 7 (2025): 1516. https://doi.org/10.3390/agronomy15071516.

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Cabbage (Brassica oleracea L.) is a globally significant vegetable crop that faces productivity challenges due to fungal and bacterial pathogens. This review highlights the potential of spectral imaging techniques, specifically multispectral and hyperspectral methods, in detecting biotic stress in cabbage, with a particular emphasis on pathogen-induced responses. These non-invasive approaches enable real-time assessment of plant physiological and biochemical changes, providing detailed spectral data to identify pathogens before visible symptoms appear. Hyperspectral imaging, with its high spec

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Kováč, Daniel, Martin Navrátil, Zbynĕk Malenovský, Michal Štroch, Vladimír Špunda, and Otmar Urban. "Reflectance continuum removal spectral index tracking the xanthophyll cycle photoprotective reactions in Norway spruce needles." Functional Plant Biology 39, no. 12 (2012): 987. http://dx.doi.org/10.1071/fp12107.

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This laboratory experiment tested the ability of the spectral index called ‘area under curve normalised to maximal band depth’ (ANMB) to track dynamic changes in the xanthophyll cycle of Norway spruce (Picea abies (L.) Karsten) needles. Four-year-old spruce seedlings were gradually acclimated to different photosynthetic photon flux densities (PPFDs) and air temperature regimes. The measurements were conducted at the end of each acclimation period lasting for 11 days. A significant decline in the chlorophylls to carotenoids ratio and the increase of the amount of xanthophyll cycle pigments indi

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Ugolini, A., B. Vignali, C. Castellini, and M. Lindström. "Zonal Orientation and Spectral Filtering in Talitrus Saltator (Amphipoda, Talitridae)." Journal of the Marine Biological Association of the United Kingdom 76, no. 2 (1996): 377–89. http://dx.doi.org/10.1017/s0025315400030617.

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Adult individuals of Talitrus saltator were tested for celestial orientation in a plexiglass bowl covered with colour filters of different wavelengths. Results show that T. saltator can recognize the sun and use it for orientation only at γ <450 nm. At γ >500 nm, the sight of the sun (and sky) only induces phototactic behaviour. It has also been confirmed that an important celestial orienting factor is perceived in the UV range. Variations in populations from diversely oriented coastlines are discussed. Preliminary results of electroretino-graphic responses indicate the presence of at le

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Ualiyeva, R. М., А. V. Osipova, М. М. Kaverina, А. А. Faurat, and S. B. Zhangazin. "Spectral Characteristics of Spring Wheat Pests Using Hyperspectral Data: Diagnostics and Adaptation Features of Colouring." BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. BIOSCIENCE SERIES 151, no. 2 (2025): 148–68. https://doi.org/10.32523/2616-7034-2025-151-2-148-168.

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Using hyperspectral imaging, the spectral characteristics of six pest species (Chorosoma schillingii, Loxostege sticticalis, Tettigonia viridissima, Chaetocnema aridula, Calliptamus italicus, and Laodelphax striatella) associated with spring wheat in northeastern Kazakhstan were investigated for the first time, complementing the few existing studies on this topic. Spectral analysis revealed how these insects reflect, transmit, and absorb light, providing insights for the future application of such data in pest recognition tasks under field conditions. The analysed species exhibited spectral re

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Tarakanov, Ivan G., Anatoly A. Kosobryukhov, Daria A. Tovstyko, et al. "Effects of Light Spectral Quality on the Micropropagated Raspberry Plants during Ex Vitro Adaptation." Plants 10, no. 10 (2021): 2071. http://dx.doi.org/10.3390/plants10102071.

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This work focuses on developing light environments for the effective regulation of morphogenesis and ex vitro conditions adaptation in micropropagated raspberry plants on the basis of photomorphogenetic control of physiological processes using light-emitting diodes (LEDs). In experiments with cloned plants growing ex vitro in stressful conditions during acclimation, the effects of optical radiation of various spectral combinations from different photosynthetically active radiation (PAR) spectral regions were studied. The data on the plant development and state of the photosynthetic apparatus,

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Scevoli, Patrizia, Fulvio Bisi, Giuliano Colombetti, Francesco Ghetti, Francesco Lenci, and Vincenzo Passarelli. "Photomotile responses of Blepharisma japonicum I: Action spectra determination and time-resolved fluorescence of photoreceptor pigments." Journal of Photochemistry and Photobiology B: Biology 1, no. 1 (1987): 75–84. http://dx.doi.org/10.1016/1011-1344(87)80007-6.

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Udensi, Joy, Ekaterina Loskutova, James Loughman, and Hugh J. Byrne. "Quantitative Raman Analysis of Carotenoid Protein Complexes in Aqueous Solution." Molecules 27, no. 15 (2022): 4724. http://dx.doi.org/10.3390/molecules27154724.

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Carotenoids are naturally abundant, fat-soluble pigmented compounds with dietary, antioxidant and vision protection advantages. The dietary carotenoids, Beta Carotene, Lutein, and Zeaxanthin, complexed with in bovine serum albumin (BSA) in aqueous solution, were explored using Raman spectroscopy to differentiate and quantify their spectral signatures. UV visible absorption spectroscopy was employed to confirm the linearity of responses over the concentration range employed (0.05–1 mg/mL) and, of the 4 Raman source wavelengths (785 nm, 660 nm, 532 nm, 473 nm), 532 nm was chosen to provide the o

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Polo, Luz K., and Fungyi Chow. "Physiological performance by growth rate, pigment and protein content of the brown seaweed Sargassum filipendula (Ochrophyta: Fucales) induced by moderate UV radiation exposure in the laboratory." Scientia Marina 84, no. 1 (2020): 59. http://dx.doi.org/10.3989/scimar.04982.22a.

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UV radiation is a factor affecting the distribution and physiology of photosynthetic organisms in an aquatic ecosystem. Studies with macroalgae indicate diverse biological disturbances in response to UV radiation. This work aimed to study sensitivity of the brown macroalga Sargassum filipendula exposed to UV radiation: PAR (control), PAR+UVA+UVB(++) and PAR+UVA(++)+UVB. Changes in the physiological parameters growth rate, total soluble proteins, photosynthetic pigments and the UV-vis absorbing compounds were analysed after T0, T4, T7 and T10 (days) of UV exposure. Physiological parameters show

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Mirzaei, Shima, Shirin Moradi, Morteza Karimi, Sara Esmaeili, Nazim S. Gruda, and Sasan Aliniaeifard. "Gamma-Aminobutyric Acid-Mediated Alkalinity Stress Alleviation in Lollo Rosso Lettuce under Diverse Light Spectra." Agronomy 14, no. 2 (2024): 313. http://dx.doi.org/10.3390/agronomy14020313.

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The agricultural sector faces challenges due to climate change and the growing global population. Alkaline stress could adversely impact plant growth and crop production. This stressor diminishes water quality essential for crop cultivation, consequently impairing plant growth and overall productivity. Gamma-aminobutyric acid (GABA), a non-protein amino acid, may exhibit multifaceted roles in plant responses to adverse environmental conditions. Optimization of crop production in controlled environmental agriculture under artificial light attracted much attention. In the present study, we inves

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Li, Ying Xia, Suo Zhou, Feng Juan Zhao, Yan Liu, Pan Pan Fan, and Guang Ce Wang. "Physiological responses of Porphyra haitanesis to different copper and zinc concentrations." Brazilian Journal of Oceanography 58, no. 4 (2010): 261–67. http://dx.doi.org/10.1590/s1679-87592010000400001.

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In the present study, several physiological responses of the red marine alga Porphyra haitanesis to elevated concentrations of copper (up to 50 μM) and zinc (up to 100 μM) were investigated. Our results showed that the effects of Cu2+ and Zn2+ on growth, photosynthetic pigments (chlorophylls and carotenoids), phycobiliprotein and metabolism (the fluorescence emission spectra and the activities of photosystemII) did not follow the same pattern. The relative growth rate was inhibited by different concentrations of Cu2+, and was slightly increased at lower concentrations (up to 10 μM) and inhibit

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Jung, Kwang-Hwan, Elena N. Spudich, Vishwa D. Trivedi, and John L. Spudich. "An Archaeal Photosignal-Transducing Module Mediates Phototaxis in Escherichia coli." Journal of Bacteriology 183, no. 21 (2001): 6365–71. http://dx.doi.org/10.1128/jb.183.21.6365-6371.2001.

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ABSTRACT Halophilic archaea, such as Halobacterium salinarumand Natronobacterium pharaonis, alter their swimming behavior by phototaxis responses to changes in light intensity and color using visual pigment-like sensory rhodopsins (SRs). In N. pharaonis, SRII (NpSRII) mediates photorepellent responses through its transducer protein, NpHtrII. Here we report the expression of fusions of NpSRII and NpHtrII and fusion hybrids with eubacterial cytoplasmic domains and analyze their function in vivo in haloarchaea and in eubacteria. A fusion in which the C terminus of NpSRII is connected by a short f

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Weremczuk-Jeżyna, Izabela, Katarzyna Hnatuszko-Konka, Liwia Lebelt, and Izabela Grzegorczyk-Karolak. "The Protective Function and Modification of Secondary Metabolite Accumulation in Response to Light Stress in Dracocephalum forrestii Shoots." International Journal of Molecular Sciences 22, no. 15 (2021): 7965. http://dx.doi.org/10.3390/ijms22157965.

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The aim of this work was to determine the effect of stress conditions caused by different light sources, i.e., blue LED (λ = 430 nm), red LED (λ = 670 nm), blue and red LED (70%:30%) and white LED (430–670 nm) on the growth and morphology of cultivated in vitro Dracocephalum forrestii shoot culture. It also examines the effects on bioactive phenolic compound production and photosynthetic pigment content, as well as on antioxidant enzyme activity (CAT, SOD, POD) and antioxidant properties. The most beneficial proliferation effect was observed under white LEDs (7.1 ± 2.1 shoots per explant). The

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Jones, G. J., and M. Tsacopoulos. "The response to monochromatic light flashes of the oxygen consumption of honeybee drone photoreceptors." Journal of General Physiology 89, no. 5 (1987): 791–813. http://dx.doi.org/10.1085/jgp.89.5.791.

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Local measurements of the fall in oxygen pressure on stimulation of slices of the retina of the honeybee drone by flashes of light were made with oxygen microelectrodes and used to calculate the kinetics of the extra oxygen consumption (delta QO2) induced by each flash. The action spectrum for delta QO2 was obtained from response-intensity curves in response to brief (40 ms) monochromatic light flashes. The action spectrum of receptor potentials was obtained with the same experimental conditions. The two action spectra match closely: they deviate slightly from the photosensitivity spectrum of

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Pankhurst, Patricia M., and Pollyanna E. Hilder. "Effect of light intensity on feeding of striped trumpeter Latris lineata larvae." Marine and Freshwater Research 49, no. 5 (1998): 363. http://dx.doi.org/10.1071/mf97155.

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This study investigates the influence of light intensity on feeding of striped trumpeter larvae, correlating feeding responses with changes in morphology of the retina during growth. A pigmented single-cone retina had differentiated one day before first feeding, and rod precursor cells and double cones were visible in the retina on the 23rd, and 25th day after hatching, respectively. Feeding performance at four light intensities (0, 1, 30, 150 and 700 lux), revealed that striped trumpeter larvae are primarily dependent on vision, a light-dependent behaviour, to feed. The youngest larvae tested

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Rosa, Ana Paula, Lúcia Barão, Lélia Chambel, Cristina Cruz, and Margarida Maria Santana. "Early Identification of Plant Drought Stress Responses: Changes in Leaf Reflectance and Plant Growth Promoting Rhizobacteria Selection-The Case Study of Tomato Plants." Agronomy 13, no. 1 (2023): 183. http://dx.doi.org/10.3390/agronomy13010183.

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Drought is a worldwide problem, especially in arid and semi-arid regions. Detection of drought stress at the initial stages, before visible signs, to adequately manage irrigation and crop fertilization to avoid crop yield loss, is a desire of most farmers. Here, we evaluated the response of tomato plants to water scarcity, through changes in leaf reflectance due to modification in leaf pigments’ content, which translates into differences in spectral reflectance indices (SRI) values. Our methodology is innovative, as we were able to easily calculate and identify several SRIs for the early detec

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Moreira, Bruna Rodrigues, Julia Vega, Marta García-Sánchez, et al. "Photomorphogenic and Biochemical Effects of Radiation and Nitrate Availability on the Red Alga Plocamium cartilagineum." Plants 14, no. 7 (2025): 1121. https://doi.org/10.3390/plants14071121.

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Non-photosynthetic photoreceptors detecting different wavelength ranges in the UV and visible region of spectra may trigger algal acclimation and homeostasis. We studied Plocamium cartilagineum responses based on the saturation of photosynthesis by Amber light and supplementation by different light qualities, applying an experimental design able to simulate a daily cycle in a fully automated system. Thalli were exposed to Amber, Amber + UV-A, Amber + Blue and Amber + Green radiation treatments under two nitrate levels (60 and 240 μM) for enrichment lasting two weeks. P. cartilagineum photosynt

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Hassan, Shurooq Falah. "Antioxidant Response of Vicia faba Plant to Foliar Spray of Green Synthesis Zirconium Oxide Nanoparticles." South Asian Research Journal of Agriculture and Fisheries 6, no. 06 (2024): 119–26. https://doi.org/10.36346/sarjaf.2024.v06i06.004.

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Previous studies have reported a positive influence of zirconium oxide nanoparticles on plants, the present effort was conducted to investigate the impact of two distinct concentrations of biosynthesized zirconium oxide nanoparticles (75 and 150 mg L-1) on the physiological and antioxidant responses of Vicia faba Plants. Zirconium oxide nanoparticles (ZrO2NPs) were synthesized using Matricaria chamomilla L. plant extracts. And their morphology and extent were determined Using X-Ray Diffraction and Transmission electron microscopy The diffuse reflectance spectra were measured using UV-Vis spect

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Wang, Yige, Xiangyang Sun, and Suyan Li. "Light Quality Effect on Internal N Retranslocation in Podocarpus macrophyllus Precultured with Exponential Nutrient Loading." Plants 13, no. 5 (2024): 705. http://dx.doi.org/10.3390/plants13050705.

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Streetlamp light is inevitable in the night landscape of a city and may affect the phenology of newly planted ornamental plants, but it has rarely been fully examined. Newly transplanted ornamental plants probably suffer periodic shocks, which mainly result from the inefficient reuse of internal nutrients for new growth. Exponential nutrient loading (ENL) is well known for its ability to overcome transplant shocks by promoting retranslocation for the reuse of strengthened nutrients from internal reserves in precultured seedlings. Transplantation to urbanized lands is distinct from that of mont

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