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1. Measuring the Ultrafast Correlation Dynamics between the Qₓ and Qy Bands in Chlorophyll Molecules

Author:
Khyasudeen, M. Faisal; Nowakowski, Paweł J.; Tan, Howe-Siang
Source:
TheJournal of physical chemistry 2019 v.123 no.6 pp. 1359-1364
ISSN:
1520-5207
Subject:
chlorophyll,   etc   ; physical chemistry; spectroscopy;     Show all 3 Subjects
Abstract:
... We use two-dimensional electronic spectroscopy to measure the ultrafast correlation dynamics between the Qₓ and Qy transitions in chlorophyll molecules. We derive a variation to the center line slope method to quantify the frequency fluctuation cross-correlation function, Cₓy(Tw). Compared with the frequency fluctuation correlation function of the Qy transition, we observe that there is only a min ...
DOI:
10.1021/acs.jpcb.9b00099

2. Improving moisture stability of SrLiAl3N4:Eu2+ through phosphor-in-glass approach to realize its application in plant growing LED device

Author:
Zhang, Yu; Zhang, Xuejie; Zhang, Haoran; Zhuang, Jianle; Hu, Chaofan; Liu, Yingliang; Wu, Zhan-Chao; Ma, Li; Wang, Xiaojun; Lei, Bingfu
Source:
Journal of colloid and interface science 2019 v.545 pp. 195-199
ISSN:
0021-9797
Subject:
chlorophyll,   etc   ; absorption; emissions factor; glass; luminescence; swine;     Show all 6 Subjects
Abstract:
... Herein, we present a simple strategy to enhance the stability of water-sensitive SrLiAl3N4:Eu2+ phosphor through embedding the phosphor particles into low-melting Sn-P-F-O glass using phosphor-in-glass (PiG) approach. After being immersed in water for 96 h, the emission intensity of the SrLiAl3N4:Eu2+-PiG sample was maintained at 80% of its pristine intensity, indicating the moisture-resistance pr ...
DOI:
10.1016/j.jcis.2019.03.032

3. Remote sensing application for the study of rapid flushing to remediate eutrophication in shallow lagoons (Albufera of Valencia)

Author:
Sòria-Perpinyà, Xavier; Miracle, Maria R.; Soria, Juan; Delegido, Jesús; Vicente, Eduardo
Source:
Hydrobiologia 2019 v.829 no.1 pp. 125-132
ISSN:
0018-8158
Subject:
chlorophyll,   etc   ; eutrophication; remote sensing; water quality;     Show all 4 Subjects
Abstract:
... Albufera of Valencia shallow lagoon experiences water clarification about once a year. This study aimed to observe the timing of water clarity events and to detect the associated flow during these periods. Spatial variation in chlorophyll a along the Albufera was observed using remote sensing images. Due to the lagoon’s spatial complexity and the varying water qualities flowing in from more than 6 ...
DOI:
10.1007/s10750-018-3741-6

4. Phototriggered Dynamic and Biomimetic Growth of Chlorosomal Self-Aggregates

Author:
Matsubara, Shogo; Tamiaki, Hitoshi
Source:
Journal of the American Chemical Society 2019 v.141 no.3 pp. 1207-1211
ISSN:
1520-5126
Subject:
chlorophyll,   etc   ; bacteria; biomimetics; photosynthesis; polymerization; ultraviolet radiation;     Show all 6 Subjects
Abstract:
... Supramolecular polymerizations mimicking native systems, which are step-by-step constructions to form self-aggregates, were recently developed. However, a general system to successively and spontaneously form self-aggregates from monomeric species remains challenging. Here, we report a photoinduced supramolecular polymerization system as a biomimetic formation of chlorophyll aggregates which are t ...
DOI:
10.1021/jacs.8b13056

5. Enhanced real-time cyanobacterial fluorescence monitoring through chlorophyll-a interference compensation corrections

Author:
Choo, F.; Zamyadi, A.; Stuetz, R.M.; Newcombe, G.; Newton, K.; Henderson, R.K.
Source:
Water research 2019 v.148 pp. 86-96
ISSN:
0043-1354
Subject:
chlorophyll,   etc   ; Chlorophyta; Cyanobacteria; drinking; fluorescence; monitoring; phycocyanin;     Show all 7 Subjects
Abstract:
... In situ fluorometers can be used as a real-time cyanobacteria detection tool to maintain safe drinking and recreational water standards. However, previous studies into fluorometers have established issues arising mainly from measurement inaccuracies due to green algae interference. Therefore, this study focusses on developing correction factors from a systematic study on the impact of green algae ...
DOI:
10.1016/j.watres.2018.10.034

6. Investigation of chlorophyll degradation by tetracycline

Author:
Rydzyński, Dariusz; Piotrowicz-Cieślak, Agnieszka I.; Grajek, Hanna; Wasilewski, Janusz
Source:
Chemosphere 2019 v.229 pp. 409-417
ISSN:
0045-6535
Subject:
chlorophyll,   etc   ; absorbance; acidification; fluorescence; ions; magnesium; pollutants; protons; spectroscopy; tetracycline;     Show all 10 Subjects
Abstract:
... Antibiotics represent a novel type of environment pollutants which modify chlorophyll content in plants. Spectroscopic methods were employed to investigate the effect of tetracycline on chlorophyll degradation. Changes in absorbance and fluorescence demonstrated that tetracycline reaction with chlorophyll results in the formation of pheophytin, which was confirmed by new bands typical of pheophyti ...
DOI:
10.1016/j.chemosphere.2019.05.035

7. Image based leaf segmentation and counting in rosette plants

Author:
Praveen Kumar, J.; Domnic, S.
Source:
Information processing in agriculture 2019 v.6 no.2 pp. 233-246
ISSN:
2214-3173
Subject:
chlorophyll,   etc   ; data collection; image analysis; leaf area; leaves; plant growth;     Show all 6 Subjects
Abstract:
... This paper proposes an efficient method to extract the leaf region and count the number of leaves in digital plant images. The plant image analysis plays a significant role in viable and productive agriculture. It is used to record the plant growth, plant yield, chlorophyll fluorescence, plant width and tallness, leaf area, etc. frequently and accurately. Plant growth is a major character to be an ...
DOI:
10.1016/j.inpa.2018.09.005

8. Effect of Chlorophyll on Lipid Oxidation of Rapeseed Oil

Author:
Li, Xue; Yang, Ruinan; Lv, Chunling; Chen, Lin; Zhang, Liangxiao; Ding, Xiaoxia; Zhang, Wen; Zhang, Qi; Hu, Chundi; Li, Peiwu
Source:
European journal of lipid science and technology 2019 v.121 no.4 pp. e1800078
ISSN:
1438-7697
Subject:
chlorophyll,   etc   ; lipid peroxidation; peroxide value; photooxidation; rancidity; rapeseed oil;     Show all 6 Subjects
Abstract:
... The residues of chlorophyll induce oxidative rancidity and deterioration through photo‐oxidation. However, the effect of chlorophyll on the quality of rapeseed oil is still unknown. In this study, chlorophyll is added into rapeseed oil to reach the desired treatment levels of 2, 5, and 10 mg kg⁻¹, while no chlorophyll is added in the control sample. Dynamic changes of the peroxide value of rapesee ...
DOI:
10.1002/ejlt.201800078

9. Aggregation of chlorophyll a induced in self-assembled membranes composed of DMPC and DHPC

Author:
Taguchi, Shogo; Suga, Keishi; Hayashi, Keita; Yoshimoto, Makoto; Okamoto, Yukihiro; Nakamura, Hidemi; Umakoshi, Hiroshi
Source:
Colloids and surfaces 2019 v.175 pp. 403-408
ISSN:
0927-7765
Subject:
chlorophyll,   etc   ; colloids; lipid content; micelles; mixing ratio; phospholipids;     Show all 6 Subjects
Abstract:
... The J-aggregate of chlorophyll a (Chla) functions as a light-harvesting antenna in natural systems. In this study, we employed the phospholipid membranes composed of longer-chain 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and shorter-chain 1,2-dihexanoyl-sn-glycero-3-phosphocholine (DHPC), as a platform to induce Chla aggregates. The DMPC/DHPC assembly at the mixing ratio (q) = 1.5 induced ...
DOI:
10.1016/j.colsurfb.2018.12.008

10. Inhibition of the photosynthetic activity of Synedra sp. by sonication: Performance and mechanism

Author:
Yao, Juanjuan; Chen, Xiangyu; Zhang, Mengran; Zhang, Yongxue; Zhang, Zhi; Xian, Xudong; Bao, Bing; Bai, Jiayun
Source:
Journal of environmental management 2019 v.233 pp. 54-62
ISSN:
0301-4797
Subject:
chlorophyll,   etc   ; Synedra; biomass; electron transfer; oxidation; photosynthesis; sonication; thylakoids; ultrasonics;     Show all 9 Subjects
Abstract:
... The impacts of sonication on the photosynthetic activity of Synedra sp. (diatom) and its mechanism were investigated for the first time. Three photosynthetic parameters, i.e., effective quantum yield (Φe), initial slope of rapid light curves (α) and maximum relative electron transport rate (rETRmax) were employed to evaluate its photosynthetic activity during sonication for the first time. The res ...
DOI:
10.1016/j.jenvman.2018.12.029

11. Chlorophyll Degradation and Light-harvesting Complex II Aggregate Formation During Dark-induced Leaf Senescence in Arabidopsis Pheophytinase Mutants

Author:
Yang, Young Nam; Safarova, Rana B.; Park, So-Yon; Sakuraba, Yasuhito; Oh, Min-Hyuk; Zulfugarov, Ismayil S.; Lee, Chin Bum; Tanaka, Ayumi; Paek, Nam-Chon; Lee, Choon-Hwan
Source:
Journal of plant biology 2019 v.62 no.1 pp. 27-38
ISSN:
1226-9239
Subject:
chlorophyll,   etc   ; Arabidopsis thaliana; genes; leaves; light harvesting complex; mutants; thylakoids;     Show all 7 Subjects
Abstract:
... The stay-green mutant of Arabidopsis thaliana, ore10 forms stable light-harvesting complex II (LHCII) aggregates during dark-induced senescence, which showed a single base deletion (G1351) in the coding region of the pheophytinase (PPH) gene. PPH specifically dephytylates the Mg-free chlorophyll (Chl) pigment pheophytin, yielding pheophorbide. In both ore10 and pph-1 mutants, pheophytin a accumula ...
DOI:
10.1007/s12374-018-0242-0

12. Chlorophyll Content as an Indicator of the Modern (2015–2016) Trophic State of Volga River Reservoirs

Author:
Mineeva, N. M.; Makarova, O. S.
Source:
Inland water biology 2018 v.11 no.3 pp. 367-370
ISSN:
1995-0829
Subject:
chlorophyll,   etc   ; eutrophication; rivers; spectrophotometers; summer;     Show all 5 Subjects
Abstract:
... Data on the chlorophyll a (Chl a) content in water of the Volga River reservoirs sampled at 64–73 sampling stations in the summer period of 2015 and 2016, analyzed using the standard spectrophotometric method, are presented. Chl a content varied from a minimum of 0.9–3.0 to a maximum of 7.6–32.1 μg/L in June 2016, from 2.1–15.5 to 9.4–86 μg/L in August 2015, and from 1.1–6.7 to 15.1–62.7 μg/L in A ...
DOI:
10.1134/S1995082918030124

13. Adaptation of light-harvesting functions of unicellular green algae to different light qualities

Author:
Ueno, Yoshifumi; Aikawa, Shimpei; Kondo, Akihiko; Akimoto, Seiji
Source:
Photosynthesis research 2019 v.139 no.1-3 pp. 145-154
ISSN:
0166-8595
Subject:
chlorophyll; chlorophyll binding proteins,   etc   ; Chlamydomonas reinhardtii; Chlorella variabilis; autotrophs; blue light; energy transfer; fluorescence; fluorescence emission spectroscopy; green light; photosystem II; red light;     Show all 12 Subjects
Abstract:
... Oxygenic photosynthetic organisms perform photosynthesis efficiently by distributing captured light energy to photosystems (PSs) at an appropriate balance. Maintaining photosynthetic efficiency under changing light conditions requires modification of light-harvesting and energy-transfer processes. In the current study, we examined how green algae regulate their light-harvesting functions in respon ...
DOI:
10.1007/s11120-018-0523-y

14. Comparison and extension of three methods for automated registration of multimodal plant images

Author:
Henke, Michael; Junker, Astrid; Neumann, Kerstin; Altmann, Thomas; Gladilin, Evgeny
Source:
Plant methods 2019 v.15 no.1 pp. 44
ISSN:
1746-4811
Subject:
chlorophyll,   etc   ; automation; color; fluorescence; image analysis; lighting; mature plants; phenotype; pigmentation; shoots; water content;     Show all 11 Subjects
Abstract:
... With the introduction of high-throughput multisensory imaging platforms, the automatization of multimodal image analysis has become the focus of quantitative plant research. Due to a number of natural and technical reasons (e.g., inhomogeneous scene illumination, shadows, and reflections), unsupervised identification of relevant plant structures (i.e., image segmentation) represents a nontrivial t ...
DOI:
10.1186/s13007-019-0426-8

15. Effect of microplastics exposure on the photosynthesis system of freshwater algae

Author:
Wu, Yanmei; Guo, Peiyong; Zhang, Xiaoyan; Zhang, Yuxuan; Xie, Shuting; Deng, Jun
Source:
Journal of hazardous materials 2019 v.374 pp. 219-227
ISSN:
0304-3894
Subject:
chlorophyll,   etc   ; Chlorella pyrenoidosa; Microcystis; algae; freshwater; microplastics; photosynthesis; poly(vinyl chloride); polypropylenes; risk; toxicity;     Show all 11 Subjects
Abstract:
... Microplastics are widely distributed in freshwater environments. At present, most of the studies on the toxicity of microplastics are concentrated on aquatic feeding animals, but relatively few have addressed freshwater algae. This study investigated the effect of microplastics (polypropylene (PP) and polyvinyl chloride (PVC)) exposure on the photosynthetic system of freshwater algae over the loga ...
DOI:
10.1016/j.jhazmat.2019.04.039

16. Spatial distributions and sea-to-air fluxes of non-methane hydrocarbons in the atmosphere and seawater of the Western Pacific Ocean

Author:
Li, Jian-Long; Zhai, Xing; Ma, Zhun; Zhang, Hong-Hai; Yang, Gui-Peng
Source:
The Science of the total environment 2019 v.672 pp. 491-501
ISSN:
0048-9697
Subject:
chlorophyll,   etc   ; air; ethane; ethylene; isoprene; latitude; mixing ratio; propane; propylene; seawater; Pacific Ocean;     Show all 11 Subjects
Abstract:
... During an oceanographic campaign in the western Pacific Ocean from 12 August to 3 October 2014, the concentrations of five non-methane hydrocarbons (NMHCs) were measured in marine atmosphere and seawater. The average mixing ratios of ethane, ethylene, propane, propylene, and isoprene were 1.109 ± 0.359, 0.658 ± 0.137, 0.711 ± 0.377, 0.429 ± 0.139, and 0.255 ± 0.201 ppbv, respectively. In general, ...
DOI:
10.1016/j.scitotenv.2019.04.019

17. Importance of mixotrophic flagellates during the ice-free season in lakes located along an elevational gradient

Author:
Waibel, Anna; Peter, Hannes; Sommaruga, Ruben
Source:
Aquatic sciences 2019 v.81 no.3 pp. 45
ISSN:
1015-1621
Subject:
chlorophyll,   etc   ; autumn; bacteria; environmental factors; euphotic zone; lakes; phosphorus; phytoplankton; summer;     Show all 9 Subjects
Abstract:
... Mixotrophy seems to be widespread among phytoplankton, but whether this strategy is more relevant in oligotrophic lakes remains unclear. Here, we tested the hypothesis that the relative abundance of mixotrophic flagellates in lakes increases along an elevational gradient paralleling increasingly oligotrophic conditions. For this purpose, 12 lakes located between 575 and 2796 m above sea level were ...
DOI:
10.1007/s00027-019-0643-2

18. Influence of Coastal Oyashio water on massive spring diatom blooms in the Oyashio area of the North Pacific Ocean

Author:
Kuroda, Hiroshi; Toya, Yuko; Watanabe, Tsuyoshi; Nishioka, Jun; Hasegawa, Daisuke; Taniuchi, Yukiko; Kuwata, Akira
Source:
Progress in oceanography 2019 v.175 pp. 328-344
ISSN:
0079-6611
Subject:
chlorophyll,   etc   ; Bacillariophyceae; algal blooms; coasts; frequency distribution; islands; nutrient content; salinity; seeds; spring; Japan; Pacific Ocean;     Show all 12 Subjects
Abstract:
... We hypothesized that the characteristics of Coastal Oyashio water in the North Pacific Ocean during winter–spring have a major influence on the generation of massive spring diatom blooms throughout the Oyashio area. To test this hypothesis, we analyzed in situ data from May during 1990–2016 along a transect known as the “A-line” to monitor conditions in the Oyashio off the southeast coast of Hokka ...
DOI:
10.1016/j.pocean.2019.05.004

19. Physiological and productive parameters of the okra under irrigation levels

Author:
dos Santos Farias, Diego Bispo; da Silva, Paulo Silas Oliveira; Tadeu Lucas, Ariovaldo Antonio; de Freitas, Maria Iderlane; de Jesus Santos, Tiago; Nascimento Fontes, Pryanka Thuyra; de Oliveira Júnior, Luiz Fernando Ganassali
Source:
Scientia horticulturae 2019 v.252 pp. 1-6
ISSN:
0304-4238
Subject:
chlorophyll,   etc   ; crop yield; fluorescence; gas exchange; irrigation rates; okra; water stress;     Show all 7 Subjects
Abstract:
... Plants undergoing any kind of water stress, whether due to excess or lack of water, undergo changes in their biochemical and physiological system, compromising their development. The effects of different irrigation levels on the physiological parameters (chlorophyll content, chlorophyll a fluorescence and gas exchange) and yield of okra were evaluated. Four levels of irrigation were evaluated (ver ...
DOI:
10.1016/j.scienta.2019.02.066

20. Spectral characteristics of copper-stressed vegetation leaves and further understanding of the copper stress vegetation index

Author:
Zhang, Chengye; Ren, Huazhong; Dai, Xiujuan; Qin, Qiming; Li, Jun; Zhang, Tianyuan; Sun, Yuanheng
Source:
International journal of remote sensing 2019 v.40 no.12 pp. 4473-4488
ISSN:
1366-5901
Subject:
chlorophyll,   etc   ; absorption; copper; leaves; nutrient uptake; reflectance; remote sensing; spectral analysis; vegetation index; vegetation types; wavelengths;     Show all 11 Subjects
Abstract:
... This study analysed the changing pattern of the spectral features of copper-stressed leaves for several vegetation types, and explored the mechanism of the Copper Stress Vegetation Index (CSVI). First, the change of seven key spectral features (Green Peak, Red Valley, Red Shoulder, NIR (Near Infrared) Reflectance Platform, Blue-Edge, Yellow-Edge, and Red-Edge) with copper stress level from low to ...
DOI:
10.1080/01431161.2018.1563842