Biomass and carotenoid pigment production by patagonian native yeasts

2006 ◽  
Vol 22 (7) ◽  
pp. 687-692 ◽  
Author(s):  
Diego Libkind ◽  
María van Broock
2021 ◽  
pp. 126909
Author(s):  
Xinyue Ye ◽  
Ya Huang ◽  
Chenyu Zhou ◽  
Xiaoyun Liu ◽  
Wenxuan Zhao ◽  
...  

2008 ◽  
Vol 190 (23) ◽  
pp. 7859-7863 ◽  
Author(s):  
Roberta Provvedi ◽  
Dana Kocíncová ◽  
Valentina Donà ◽  
Daniel Euphrasie ◽  
Mamadou Daffé ◽  
...  

ABSTRACT Carotenoids are complex lipids that are known for acting against photodynamic injury and free radicals. We demonstrate here that σF is required for carotenoid pigment production in Mycobacterium smegmatis. We further show that a sigF mutant exhibits a transformation efficiency 104-fold higher than that of the parental strain, suggesting that σF regulates the production of components affecting cell wall permeability. In addition, a sigF mutant showed an increased sensitivity to hydrogen peroxide. An in silico search of the M. smegmatis genome identified a number of SigF consensus sites, including sites upstream of the carotenoid synthesis locus, which explains its SigF regulation.


2019 ◽  
Vol 24 (7) ◽  
pp. 6
Author(s):  
Ghada A. Mohammad ◽  
Suhair Taha Daod

Three Staphylococcus aureus isolates were used in the present study for extraction and quantitation of carotenoid pigment production. Different culture conditions were used to determine optimum pigmentation such as type of culture media, different pH values, temperature, and finally daily bacterial sub-culturing for more than 2 weeks. Nutrient agar was found to be the best medium with the highest production (1.09). Optimum pH value was 6.5 and gave (1.8) carotenoid. Also results showed that pigment was produced at 37o C more than at 42oC. Daily repeated sub culturing had a negative impact on pigment production. Colonies gradualy lost pigmentation and became white in color. Also, sub-culturing was shown to affect the volume of the colonies as they became smaller on solid media.    http://dx.doi.org/10.25130/tjps.24.2019.122


2021 ◽  
Vol 86 (3) ◽  
pp. 969-976
Author(s):  
Chuantao Zeng ◽  
Yumiko Yoshizaki ◽  
Xuan Yin ◽  
Zitai Wang ◽  
Kayu Okutsu ◽  
...  

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Jingyi Yu ◽  
Lulin Rao ◽  
Lingling Zhan ◽  
Bingjie Wang ◽  
Qing Zhan ◽  
...  

Abstract Background In recent years, clinical Staphylococcus aureus isolates have become highly resistant to antibiotics, which has raised concerns about the ability to control infections by these organisms. The aim of this study was to clarify the effect of a new small molecule, ZY-214-4 (C19H11BrNO4), on S. aureus pigment production. Results At the concentration of 4 μg/mL, ZY-214-4 exerted a significant inhibitory effect on S. aureus pigment synthesis, without affecting its growth or inducing a toxic effect on the silkworm. An oxidant sensitivity test and a whole-blood killing test indicated that the S. aureus survival rate decreased significantly with ZY-214-4 treatment. Additionally, ZY-214-4 administration significantly reduced the expression of a pigment synthesis-related gene (crtM) and the superoxide dismutase genes (sodA) as determined by real-time quantitative polymerase chain reaction (RT-qPCR) analysis. ZY-214-4 treatment also improved the survival rate of S. aureus-infected silkworm larvae. Conclusions The small molecule ZY-214-4 has potential for the prevention of S. aureus infections by reducing the virulence associated with this bacterium.


The Holocene ◽  
2020 ◽  
pp. 095968362098167
Author(s):  
Welmoed A Out ◽  
Andreas Mieth ◽  
Sergi Pla-Rabés ◽  
Marco Madella ◽  
Svetlana Khamnueva-Wendt ◽  
...  

Although Rapa Nui has been proposed as a classic example of cultural collapse, this hypothesis has been repeatedly questioned. This paper investigates cultural continuity on Rapa Nui following the onset of deforestation through a study of red ochre pits. Red ochre pigments are well-known from various contexts on Rapa Nui, but until recently its origin and the extraction process involved in their production were not precisely understood. New excavations have revealed the presence of multiple pits used for pigment production and storage by the island’s prehistoric culture. Previous geoarchaeological studies, including geomorphological, pedological, geochemical and micromorphological analyses, have shown that the pits contain fine layers of reddish iron oxides (ochre), which result from repeated intentional burning. The oxide layers alternate with thin layers of phytoliths, interpreted as the remains of plant material used as fuel, and diatoms. This paper presents new phytolith and diatom data from the previously described site of Vaipú East, complemented with data from similar pits at the new sites of Vaipú West and Poike. New 14C dates are also presented from these sites. The phytolith and diatom data provide crucial information about the chaîne opératoire of the ochre production and the formation processes associated with the pits. The evidence of pigment production and storage at Vaipú East shows that labour-intensive ochre production took place on Rapa Nui during at least two separate phases after deforestation, while the pits discovered at other sites indicate that Vaipú East did not stand alone. This provides a further line of evidence in favour of cultural continuity rather than collapse following deforestation in the island’s late prehistory.


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