U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Subject "pigments" Remove constraint Subject: "pigments"
Start Over

Search

7,487  Search Results

« Previous | 1 - 20 of 7,487 |
Number of results to display per page

Search Results

1. Assessment of the orientation and conformation of pigments in protein binding sites from infrared difference spectra

Author:
Rohani, Leyla; Hastings, Gary
Source:
Biochimica et biophysica acta 2021 v.1862 no.4 pp. 148366
ISSN:
0005-2728
Subject:
pigments,   etc   ; binding sites; frequency; hydrogen bonding; naphthoquinones; photosystem I; phylloquinone; protein binding; spectroscopy; tail;     Show all 10 Subjects
Abstract:
... Time resolved FTIR difference spectroscopy (DS) has been used to study photosystem I (PSI) with the disubstituted 1,4-naphthoquinones acequinocyl (AcQ) and lapachol (Lpc) incorporated into the A₁ binding site. AcQ is a 2-acetoxy-3-dodecyl-1,4-naphthoquinone, Lpc is a 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphthoquinone. To assess whether the experimental spectra are specific to different orientatio ...
DOI:
10.1016/j.bbabio.2020.148366

2. Evaluation of degradation of pigments formed during garlic discoloration in different pH

Author:
Zhao, Ruixuan; Zhang, Bin; Sun, Jieru; Zheng, Zhenjia; Qiao, Xuguang
Source:
Food research international 2021 v.140 pp. 109957
ISSN:
0963-9969
Subject:
pigments,   etc   ; Fourier transform infrared spectroscopy; absorption; degradation; discoloration; food research; garlic; pH; principal component analysis;     Show all 9 Subjects
Abstract:
... The specific chemical bond changes of green pigment formed in garlic discoloration were investigated in our study. Multiple analysis methods were used in the degradation of pigment, including ultraviolet–visible (UV–Vis) spectrophotometry, attenuated total reflection Fourier transform infrared (ATR-FTIR) and Fourier transform infrared near infrared (FT-NIR). Green pigments were treated at 40 °C fo ...
DOI:
10.1016/j.foodres.2020.109957

3. Green earth pigments dispersions: Water dynamics at the interfaces

Author:
Fanost, Agathe; Jaber, Maguy; de Viguerie, Laurence; Korb, Jean-Pierre; Levitz, Pierre E.; Michot, Laurent J.; Mériguet, Guillaume; Rollet, Anne-Laure
Source:
Journal of colloid and interface science 2021 v.581 pp. 644-655
ISSN:
0021-9797
Subject:
pigments,   etc   ; dispersions; iron; minerals; models; nuclear magnetic resonance spectroscopy; surface area;     Show all 7 Subjects
Abstract:
... The objective is to elucidate the multiscale dynamics of water within natural mixtures of minerals, green earth pigments that are mainly composed of phyllosilicates containing large amount of iron. In particular, the interaction of water with the different kinds of surfaces has to be probed. One issue is to examine the influence of surface type, basal or edge, on the dispersion quality.The study w ...
DOI:
10.1016/j.jcis.2020.07.085

4. Photoluminescence excited at variable fluences: a novel approach for studying the emission from crystalline pigments in paints

Author:
Ghirardello, Marta; Kelly, Nigel M.; Valentini, Gianluca; Toniolo, Lucia; Comelli, Daniela
Source:
Analytical methods 2020 v.12 no.32 pp. 4007-4014
ISSN:
1759-9679
Subject:
pigments,   etc   ; models; paints; photoluminescence; semiconductors; spectroscopy; wavelengths;     Show all 7 Subjects
Abstract:
... Crystalline solids can exhibit photoluminescence when properly excited by sufficiently energetic light radiation. Following excitation, different radiative and non-radiative recombination pathways can occur that are informative of the energetic structure of the material as well as of the presence of crystal defects and impurities. Usually, the characterization of the optical emission of crystallin ...
DOI:
10.1039/d0ay01160f

5. Antioxidants enhance lipid productivity in Heveochlorella sp. Yu

Author:
Cui, Na; Xiao, Junmu; Feng, Yongjie; Zhao, Yongteng; Yu, Xuya; Xu, Jun-Wei; Li, Tao; Zhao, Peng
Source:
Algal research 2021 v.55 pp. 102235
ISSN:
2211-9264
Subject:
pigments,   etc   ; algae; biosynthesis; butylated hydroxyanisole; butylated hydroxytoluene; fulvic acids; lipids; melatonin; nitric oxide; reactive oxygen species; research;     Show all 11 Subjects
Abstract:
... In this study, crude lipids, including pigment accumulation, in Heveochlorella sp. Yu were evaluated after the addition of four antioxidants (melatonin, fulvic acid, butylhydroxytoluene and butylated hydroxyanisole). Melatonin enhanced crude lipid accumulation in this alga, with crude lipid productivity increasing by 31.83% (from 185.57 mg L⁻¹ d⁻¹ to 244.63 mg L⁻¹ d⁻¹). Moreover, the level of reac ...
DOI:
10.1016/j.algal.2021.102235

6. Carotenoid biosynthesis and the evolution of carotenogenesis genes in rust fungi

Author:
Wang, Erpei; Dong, Chongmei; Zhang, Peng; Roberts, Thomas H.; Park, Robert F.
Source:
Fungal biology 2021 v.125 no.5 pp. 400-411
ISSN:
1878-6146
Subject:
pigments,   etc   ; Aphidoidea; Escherichia coli; Puccinia graminis; biosynthesis; diagnostic techniques; fungi; genes; hybrids; lycopene; mycology; phylogeny; phytoene synthase; pigmentation; spores; strains;     Show all 16 Subjects
Abstract:
... Diseases caused by rust fungi pose a significant threat to global plant production. Although carotenoid pigments are produced in spores of nearly all rust species, the corresponding biosynthesis pathway(s) have not been investigated. Here, candidate genes for carotenoid biosynthesis in Puccinia graminis f. sp. tritici (Pgt) were identified, cloned and functionally complemented using specifically e ...
DOI:
10.1016/j.funbio.2020.12.005

7. Adaptive evolution of microalgae Schizochytrium sp. under high temperature for efficient production of docosahexaeonic acid

Author:
Hu, Xuechao; Tang, Xiuyang; Bi, Zhiqian; Zhao, Quanyu; Ren, Lujing
Source:
Algal research 2021 v.54 pp. 102212
ISSN:
2211-9264
Subject:
pigments,   etc   ; Schizochytrium; cell growth; energy; evolutionary adaptation; fatty acid composition; fermentation; heat tolerance; industrialization; laboratories; lipids; microalgae; microorganisms; proteins; temperature;     Show all 15 Subjects
Abstract:
... Temperature is an important factor that not only affects cell growth, but also changes fatty acid composition in oleaginous microorganisms. Here, adaptive laboratory evolution (ALE) was performed in Schizochytrium sp. to enhance strain thermotolerance in docosahexaeonic acid (DHA) production. The adaptive strain showed higher growth rate and lower temperature sensitivity. Cell growth rate of the a ...
DOI:
10.1016/j.algal.2021.102212

8. A novel photoelectrochemical approach for efficient assessment of TiO2 pigments weatherability

Author:
Guan, Rengui; He, Zhijuan; Liu, Shanshan; Han, Yanyang; Wang, Qianxi; Cui, Wei; He, Tao
Source:
Powder technology 2021 v.380 pp. 334-340
ISSN:
0032-5910
Subject:
pigments,   etc   ; detection; dyes; electric current; monitoring; oxidation; photolysis; product quality; quality control; sampling; technology; titanium dioxide; water;     Show all 13 Subjects
Abstract:
... Weatherability of TiO₂ pigments can be improved by suppressing the TiO₂ photoactivity with surface coating of insulating oxides. To develop an effective, accurate and high-sensitivity rapid weatherability assessment method is necessary for the product quality control during the pigment production. The present work proposed a novel photoelectrochemical (PEC) approach to assess the weatherability of ...
DOI:
10.1016/j.powtec.2020.11.004

9. Preparation of multi-purpose TiO2 pigment with improved properties for coating applications

Author:
George, John; Gopalakrishnan, C.C.; Manikuttan, P.K.; Mukesh, K.; Sreenish, S.
Source:
Powder technology 2021 v.377 pp. 269-273
ISSN:
0032-5910
Subject:
pigments,   etc   ; Fourier transform infrared spectroscopy; aluminum oxide; boehmite; coatings; durability; optical properties; titanium dioxide; transmission electron microscopy; zirconium oxide;     Show all 10 Subjects
Abstract:
... A rutile-grade multipurpose TiO₂ pigment with surface coatings of zirconia and alumina is prepared under controlled conditions. HRTEM, FTIR, ξ-Potential etc. were used to characterize the morphology, structure and electrokinetics. A continuous and compact film of zirconia was anchored on the base TiO₂ particles surface as the innermost coating. A composite coating of alumina was precipitated under ...
DOI:
10.1016/j.powtec.2020.08.050

10. Altering light–dark cycle at pre-harvest stage regulated growth, nutritional quality, and photosynthetic pigment content of hydroponic lettuce

Author:
Shao, Mingjie; Liu, Wenke; Zha, Lingyan; Zhou, Chengbo; Zhang, Yubin; Li, Baoshi
Source:
Acta physiologiae plantarum 2021 v.43 no.1 pp. 9
ISSN:
0137-5881
Subject:
pigments,   etc   ; carotenoids; chlorophyll; developmental stages; electric energy consumption; hydroponics; leaf area; lettuce; nitrates; nutritive value; photoperiod; photosynthesis; phytochemicals; starch; sugars;     Show all 15 Subjects
Abstract:
... Lettuce exposed to red (R) and blue (B) LEDs (4R:1B, 200 μmol·m⁻²·s⁻¹) were cultivated hydroponically in an environmentally controlled plant factory to examine the effects of light–dark cycle (LDC) conversion at pre-harvest stage on the growth, phytochemical, and photosynthetic pigment accumulation of lettuce. Lettuce plants of four groups were firstly cultivated with the same LDC of 16/8 h (light ...
DOI:
10.1007/s11738-020-03187-w

11. Disruptions of feather carotenoid pigmentation in a subset of hybrid northern flickers (Colaptes auratus) may be linked to genetic incompatibilities

Author:
Hudon, Jocelyn; Wiebe, Karen L.; Stradi, Riccardo
Source:
Comparative biochemistry and physiology 2021 v.251 pp. 110510
ISSN:
1096-4959
Subject:
pigments,   etc   ; Colaptes auratus; alleles; beta-cryptoxanthin; birds; color; feathers; hybridization; hybrids; hydroxylation; loci; oxidation; phenotype; pigmentation; North America;     Show all 15 Subjects
Abstract:
... Hybridization can bring in single individuals alleles that were never designed to work together, which can result in unexpected or transgressive phenotypes. The Yellow-shafted (auratus group) and Red-shafted (cafer group) subspecies groups of the Northern Flicker (Colaptes auratus) differ conspicuously in the coloration of their flight feathers, but hybridize freely where their ranges overlap in w ...
DOI:
10.1016/j.cbpb.2020.110510

12. Evolutions of the protection performances of epoxy coatings containing different concentrations of submicron-sheet zinc phosphate pigment

Author:
Shi, Chao; Shao, Yawei; Wang, Yanqiu; Liu, Bin; Meng, Guozhe
Source:
Colloids and surfaces 2019 v.577 pp. 378-395
ISSN:
0927-7757
Subject:
pigments,   etc   ; coatings; epoxides; phosphates; resins;     Show all 5 Subjects
Abstract:
... Submicron-sheet zinc phosphate (SZP) and conventional zinc phosphate (CZP) were added with 5, 10, 20 and 30 wt.% (mass concentration) into epoxy coatings, then the evolutions of anticorrosion performances were studied. With a same mass concentration, there were differences on the ratios (λ) of pigment volume concentration (PVC) to critical pigment volume concentration (CPVC) for SZP and CZP pigmen ...
DOI:
10.1016/j.colsurfa.2019.05.084

13. Carotenoids and their role in cancer prevention

Author:
Rowles, Joe L.; Erdman, John W.
Source:
Biochimica et biophysica acta 2020 v.1865 no.11 pp. 158613
ISSN:
1388-1981
Subject:
pigments,   etc   ; carcinogenesis; carotenoids; diet; fruits; lifestyle; neoplasms; risk; toxicology; vegetables;     Show all 10 Subjects
Abstract:
... Approximately two of every five people will develop cancer in their lifetime. Dietary modifications are one of the most promising lifestyle changes that can adjust the risk of developing cancer by nearly 40%. Carotenoids are a diverse group of natural pigments and are present in many fruits and vegetables. The data surrounding carotenoids and their potential roles in carcinogenesis have been rapid ...
DOI:
10.1016/j.bbalip.2020.158613

14. B‐box proteins: Pivotal players in light‐mediated development in plants

Author:
Song, Zhaoqing; Bian, Yeting; Liu, Jiujie; Sun, Yuting; Xu, Dongqing
Source:
Journal of integrative plant biology 2020 v.62 no.9 pp. 1293-1309
ISSN:
1672-9072
Subject:
pigments,   etc   ; photomorphogenesis; plant growth control; signal transduction; transcription (genetics);     Show all 5 Subjects
Abstract:
... Light signals mediate a number of physiological and developmental processes in plants, such as flowering, photomorphogenesis, and pigment accumulation. Emerging evidence has revealed that a group of B‐box proteins (BBXs) function as central players in these light‐mediated developmental processes. B‐box proteins are a class of zinc‐coordinated transcription factors or regulators that not only direc ...
DOI:
10.1111/jipb.12935

15. Chlorophyll hormesis: Are chlorophylls major components of stress biology in higher plants?

Author:
Agathokleous, Evgenios; Feng, ZhaoZhong; Peñuelas, Josep
Source:
The Science of the total environment 2020 v.726 pp. 138637
ISSN:
0048-9697
Subject:
pigments,   etc   ; chlorophyll; herbivores; hormesis; meta-analysis; oxidative stress; pollution;     Show all 7 Subjects
Abstract:
... High oxidative stress inhibits the synthesis and accumulation of chlorophylls, the pigments that absorb and use light. We collated evidence from a diverse array of studies demonstrating that chlorophyll concentration increases in response to low-level stress and decreases in response to high-level stress. These observations were from 33 species, >20 stress-inducing agents, 43 experimental setups a ...
DOI:
10.1016/j.scitotenv.2020.138637

16. Bone tools, ornaments and other unusual objects during the Middle to Upper Palaeolithic transition in Italy

Author:
Arrighi, Simona; Moroni, Adriana; Tassoni, Laura; Boschin, Francesco; Badino, Federica; Bortolini, Eugenio; Boscato, Paolo; Crezzini, Jacopo; Figus, Carla; Forte, Manuela; Lugli, Federico; Marciani, Giulia; Oxilia, Gregorio; Negrino, Fabio; Riel-Salvatore, Julien; Romandini, Matteo; Peresani, Marco; Spinapolice, Enza Elena; Ronchitelli, Annamaria; Benazzi, Stefano
Source:
Quaternary international 2020 v.551 pp. 169-187
ISSN:
1040-6182
Subject:
pigments,   etc   ; Gastropoda; archaeology; human behavior; humans; manufacturing; Italy;     Show all 7 Subjects
Abstract:
... The arrival of Modern Humans (MHs) in Europe between 50 ka and 39 ka coincides with significant changes in human behaviour, notably regarding the production of tools, the exploitation of resources and the systematic use of ornaments and colouring substances. The emergence of the so-called modern behaviour is usually associated with MHs, although claims of symbolic thinking in non-MH groups have be ...
DOI:
10.1016/j.quaint.2019.11.016

17. A novel microfluidic aqueous two-phase system with immobilized enzyme enhances cyanidin-3-O-glucoside content in red pigments from mulberry fruits

Author:
Zhou, Xue-Jiao; Zhu, Chang-Tong; Hu, Yan; You, Shuai; Wu, Fu-An; Wang, Jun
Source:
Biochemical engineering journal 2020 v.158 pp. 107556
ISSN:
1369-703X
Subject:
pigments,   etc   ; Morus rubra; immobilized enzymes; mulberries; pH; temperature; China;     Show all 7 Subjects
Abstract:
... Mulberry red pigments are safe, nontoxic and are one of the 48 natural pigments officially approved in China. Cyanidin-3-O-glucoside accounts for about 20 % of the total mulberry red pigments and has high physiological activity. Therefore, a novel microfluidic aqueous two-phase system with immobilized enzyme was constructed to enhance the cyanidin-3-O-glucoside content in red pigments under parall ...
DOI:
10.1016/j.bej.2020.107556

18. Molecular dynamics simulations in photosynthesis

Author:
Liguori, Nicoletta; Croce, Roberta; Marrink, Siewert J.; Thallmair, Sebastian
Source:
Photosynthesis research 2020 v.144 no.2 pp. 273-295
ISSN:
0166-8595
Subject:
pigments,   etc   ; enzymes; lipids; molecular dynamics; photosynthesis; proteins; simulation models;     Show all 7 Subjects
Abstract:
... Photosynthesis is regulated by a dynamic interplay between proteins, enzymes, pigments, lipids, and cofactors that takes place on a large spatio-temporal scale. Molecular dynamics (MD) simulations provide a powerful toolkit to investigate dynamical processes in (bio)molecular ensembles from the (sub)picosecond to the (sub)millisecond regime and from the Å to hundreds of nm length scale. Therefore, ...
DOI:
10.1007/s11120-020-00741-y

19. Aggregation-Dependent Photoreactive Hemicyanine Assembly as a Photobactericide

Author:
Tian, Tian; Qian, Tingjuan; Sui, Xinyu; Yu, Qilin; Liu, Yingxin; Liu, Xinfeng; Chen, Yulan; Wang, Yi-Xuan; Hu, Wenping
Source:
ACS applied materials & interfaces 2020 v.12 no.20 pp. 22552-22559
ISSN:
1944-8252
Subject:
pigments,   etc   ; dyes; light; photocatalysts; photochemotherapy; photosensitizing agents; photosynthesis;     Show all 7 Subjects
Abstract:
... Organic materials that show substantial reactivity under visible light have received considerable attention due to their wide applications in chemical and biological systems. Hemicyanine pigments possess a strong intramolecular donor–acceptor structure and thereby display intense absorption in the visible spectral region. However, most excitons are consumed via the twisted intramolecular charge-tr ...
DOI:
10.1021/acsami.0c03894

20. A review of granular flow in screw feeders and conveyors

Author:
Minglani, Dheeraj; Sharma, Abhishek; Pandey, Harsh; Dayal, Ram; Joshi, Jyeshtharaj B.; Subramaniam, Shankar
Source:
Powder technology 2020 v.366 pp. 369-381
ISSN:
0032-5910
Subject:
pigments,   etc   ; cement; conveyors; drugs; food processing; industry; minerals; mixing; plastics;     Show all 9 Subjects
Abstract:
... Screw feeders and conveyors are mainly used in industries like minerals, agriculture, chemicals, pharmaceuticals, pigments, plastics, cement, sands, and food processing for transporting and mixing the granular materials. The system looks mechanically simple but the physics of particle transport in the system is complex; problems like bridging and blockage may be observed in the operation. A compre ...
DOI:
10.1016/j.powtec.2020.02.066