Structural diversification of bola-amphiphilic glycolipid-type supramolecular hydrogelators exhibiting colour changes along with the gel–sol transition

Soft Matter ◽  
2020 ◽  
Vol 16 (31) ◽  
pp. 7274-7278
Author(s):  
Ryoya Oosumi ◽  
Masato Ikeda ◽  
Akitaka Ito ◽  
Masayuki Izumi ◽  
Rika Ochi
Keyword(s):  
Colour Changes ◽  
Reversible Thermochromism ◽  
Structural Diversification

We diversified the structures of bola-amphiphilic glycolipid-type supramolecular hydrogelators that exhibit reversible thermochromism concurrently with a gel–sol transition.

scholarly journals Synthesis and Self-Assembly Properties of Bola-Amphiphilic Glycosylated Lipopeptide-Type Supramolecular Hydrogels Showing Colour Changes Along with Gel–Sol Transition

2021 ◽  
Vol 22 (4) ◽  
pp. 1860
Author(s):  
Naoki Tsutsumi ◽  
Akitaka Ito ◽  
Azumi Ishigamori ◽  
Masato Ikeda ◽  
Masayuki Izumi ◽  
...  
Keyword(s):  
Self Assembly ◽  
Soft Materials ◽  
The Self ◽  
Low Molecular Weight ◽  
Stimuli Responsive ◽  
Short Peptide ◽  
Peptide Moiety ◽  
Colour Changes ◽  
Reversible Thermochromism ◽  
Significant Attention

Supramolecular hydrogels formed by self-assembly of low-molecular-weight amphiphiles (hydrogelators) have attracted significant attention, as smart and soft materials. However, most of the observed stimuli-responsive behaviour of these supramolecular hydrogels are limited to gel–sol transitions. In this study, we present bola-amphiphilic glycosylated lipopeptide-type supramolecular hydrogelators that exhibit reversible thermochromism along with a gel–sol transition. The bola-amphiphiles have mono-, di-, tri- or tetra-phenylalanine (F) as a short peptide moiety. We investigate and discuss the effects of the number of F residues on the gelation ability and the morphology of the self-assembled nanostructures.

Assimilation of various organic carbon sources by Haematococcus strains

2009 ◽  
Vol 57 (2) ◽  
pp. 231-237
Author(s):  
M. Zych ◽  
A. Stolarczyk ◽  
K. Maca ◽  
A. Banaś ◽  
K. Termińska-Pabis ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Organic Compounds ◽  
Present Experiment ◽  
Carbon Sources ◽  
Growth Conditions ◽  
Mixotrophic Growth ◽  
Naturally Occurring ◽  
Organic Carbon Sources ◽  
Secondary Carotenoids ◽  
Colour Changes

Differences in the assimilation of individual organic compounds (5 mM sugars and L-asparagine) under mixotrophic growth conditions were described for three naturally occurring Haematococcus strains.The effects of assimilation were measured by the growth intensity and size of algal cells, and the effect of colour changes in the cultures was observed. Some compounds caused the cell colouration to change from green to yellow, being the result of chlorophyll disappearance and the accumulation of yellow secondary carotenoids. In the present experiment none of the cultures turned red, thus excluding the intense accumulation of the commercially interesting carotenoid, astaxanthin.

scholarly journals Single crystal of two-dimensional mixed-halide copper-based perovskites with reversible thermochromism

2021 ◽  
Author(s):  
Amr Elattar ◽  
Hiroo Suzuki ◽  
Ryuji Mishima ◽  
Kodai Nakao ◽  
Hiromi Ota ◽  
...  
Keyword(s):  
Single Crystal ◽  
Band Gaps ◽  
Two Dimensional ◽  
Facile Synthesis ◽  
Reversible Thermochromism

Facile synthesis of single crystal of two-dimensional mixed-halide copper-based perovskites with tunable band gaps and their capability of exfoliation and reversible thermochromism.

scholarly journals Alteration of Tissue Marking Dyes Depends on Used Chromogen during Immunohistochemistry

Cells ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 835
Author(s):  
Selina Kiefer ◽  
Julia Huber ◽  
Hannah Füllgraf ◽  
Kristin Sörensen ◽  
Agnes Csanadi ◽  
...  
Keyword(s):  
Colour Change ◽  
Residual Tumour ◽  
Blue Colour ◽  
Close Margin ◽  
Correct Orientation ◽  
Therapeutic Regime ◽  
Colour Changes ◽  
Tissue Specimens ◽  
Immunohistochemical Analyses ◽  
Colour Signal

Pathological biopsy protocols require tissue marking dye (TMD) for orientation. In some cases (e.g., close margin), additional immunohistochemical analyses can be necessary. Therefore, the correlation between the applied TMD during macroscopy and the examined TMD during microscopy is crucial for the correct orientation, the residual tumour status and the subsequent therapeutic regime. In this context, our group observed colour changes during routine immunohistochemistry. Tissue specimens were marked with various TMD and processed by two different methods. TMD (blue, red, black, yellow and green) obtained from three different providers (A, B and C, and Whiteout/Tipp-Ex®) were used. Immunohistochemistry was performed manually via stepwise omission of reagents to identify the colour changing mechanism. Blue colour from provider A changed during immunohistochemistry into black, when 3,3′-Diaminobenzidine-tetrahydrochloride-dihydrate (DAB) and H2O2 was applied as an immunoperoxidase-based terminal colour signal. No other applied reagents, nor tissue texture or processing showed any influence on the colour. The remaining colours from provider A and the other colours did not show any changes during immunohistochemistry. Our results demonstrate an interesting and important pitfall in routine immunohistochemistry-based diagnostics that pathologists should be aware of. Furthermore, the chemical rationale behind the observed misleading colour change is discussed.

scholarly journals Structural Diversification of Hapalindole and Fischerindole Natural Products via Cascade Biocatalysis

ACS Catalysis ◽  
2021 ◽  
pp. 4670-4681
Author(s):  
Robert M. Hohlman ◽  
Sean A. Newmister ◽  
Jacob N. Sanders ◽  
Yogan Khatri ◽  
Shasha Li ◽  
...  
Keyword(s):  
Natural Products ◽  
Cascade Biocatalysis ◽  
Structural Diversification

scholarly journals Indicator Layers Based on Ethylene-Vinyl Acetate Copolymer (EVA) and Dicyanovinyl Azobenzene Dyes for Fast and Selective Evaluation of Vaporous Biogenic Amines

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4361
Author(s):  
Tinkara Mastnak ◽  
Aleksandra Lobnik ◽  
Gerhard Mohr ◽  
Matjaž Finšgar
Keyword(s):  
Biogenic Amines ◽  
Vinyl Acetate ◽  
Colour Change ◽  
Ethylene Vinyl Acetate ◽  
Yellow Orange ◽  
Colour Changes ◽  
Limit Sensitivity ◽  
Linear Concentration Range ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

The article presents naked-eye methods for fast, sensitive, and selective detection of isopentylamine and cadaverine vapours based on 4-N,N-dioctylamino-4′-dicyanovinylazobenzene (CR-528) and 4-N,N-dioctylamino-2′-nitro-4′-dicyanovinylazobenzene (CR-555) dyes immobilized in ethylene-vinyl acetate copolymer (EVA). The reaction of CR-528/EVA and CR-555/EVA indicator layers with isopentylamine vapours caused a vivid colour change from pink/purple to yellow/orange-yellow. Additionally, CR-555/EVA showed colour changes upon exposure to cadaverine. The colour changes were analysed by ultraviolet–visible (UV/VIS) molecular absorption spectroscopy for amine quantification, and the method was partially validated for the detection limit, sensitivity, and linear concentration range. The lowest detection limits were reached with CR-555/EVA indicator layers (0.41 ppm for isopentylamine and 1.80 ppm for cadaverine). The indicator layers based on EVA and dicyanovinyl azobenzene dyes complement the existing library of colorimetric probes for the detection of biogenic amines and show great potential for food quality control.

Improving museum lighting: new experiments in perception and the colour changes caused by white LED lighting

2016 ◽  
Vol 61 (sup2) ◽  
pp. 302-304 ◽  
Author(s):  
Hung-Wen Luo ◽  
Hung-Shing Chen ◽  
Ching-Ju Chou ◽  
Ming Ronnier Luo
Keyword(s):  
White Led ◽  
Led Lighting ◽  
Colour Changes

scholarly journals Heat-induced colour changes of pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) wood

2007 ◽  
Vol 42 (5) ◽  
pp. 369-384 ◽  
Author(s):  
Bruno Esteves ◽  
António Velez Marques ◽  
Idalina Domingos ◽  
Helena Pereira
Keyword(s):  
Eucalyptus Globulus ◽  
Pinus Pinaster ◽  
Colour Changes
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