Lipopeptides constitute a structurally diverse group of metabolites produced by various bacterial and fungal genera. In the past decades, research on lipopeptides has been fueled by their antimicrobial, antitumour, immunosuppressant and surfactant activities. However, the natural functions of lipopeptides in the lifestyles of the producing microorganisms have received considerably less attention. The substantial structural diversity of lipopeptides suggests that these metabolites have different natural roles, some of which may be unique to the biology of the producing organism. This review gives a detailed overview of the versatile functions of lipopeptides in the biology of Pseudomonas and Bacillus species, and highlights their role in competitive interactions with coexisting organisms, including bacteria, fungi, oomycetes, protozoa, nematodes and plants. Their functions in cell motility, leading to colonization of novel habitats, and in the formation and development of highly structured biofilms are discussed in detail. Finally, this review provides an update on lipopeptide detection and discovery as well as on novel regulatory mechanisms and genes involved in lipopeptide biosynthesis in these two bacterial genera.

Natural functions of lipopeptides from Bacillus and Pseudomonas: more than surfactants and antibiotics

Carbon and graphene quantum dots (CQDs and GQDs), known as zero-dimensional (0D) nanomaterials, have been attracting increasing attention in sensing and bioimaging. Their unique electronic, fluores...

Review of Carbon and Graphene Quantum Dots for Sensing

Over the last seven decades, applications using members of the Bacillus subtilis group have emerged in both food processes and crop protection industries. Their ability to form survival endospores and the plethora of antimicrobial compounds they produce has generated an increased industrial interest as food preservatives, therapeutic agents and biopesticides. In the growing context of food biopreservation and biological crop protection, this review suggests a comprehensive way to visualize the antimicrobial spectrum described within the B. subtilis group, including volatile compounds. This classification distinguishes the bioactive metabolites based on their biosynthetic pathways and chemical nature: i.e., ribosomal peptides (RPs), volatile compounds, polyketides (PKs), non-ribosomal peptides (NRPs), and hybrids between PKs and NRPs. For each clade, the chemical structure, biosynthesis and antimicrobial activity are described and exemplified. This review aims at constituting a convenient and updated classification of antimicrobial metabolites from the B. subtilis group, whose complex phylogeny is prone to further development.

/pdf/overview-of-the-antimicrobial-compounds-produced-by-members-h9zmgur7c5.pdf

Overview of the Antimicrobial Compounds Produced by Members of the Bacillus subtilis Group.

Drugs: A review of promising novel corrosion inhibitors

Organic corrosion inhibitors for industrial cleaning of ferrous and non-ferrous metals in acidic solutions: A review

Molybdate and tungstate as corrosion inhibitors for cold rolling steel in hydrochloric acid solution

The influence of NaCl deposition on the corrosion of zinc in atmospheres with and without SO2 was studied via quartz crystal microbalance. Regularity of the initial corrosion of zinc under these conditions was analyzed. The results show that NaCl can accelerate the corrosion of zinc. Mass gain of zinc increases with the exposure time, which can be correlated by using exponential decay function. The relationship between mass gain and amount of NaCl deposition is well linear at any time in air containing 1 ppm SO2, but follows quadratic function in air without SO2. More amount of NaCl deposition will slow down the corrosion to some extent after exposure for certain time in the presence of SO2. The combined effect of NaCl and SO2 on the corrosion of zinc is greater than that caused by each single component. Fourier transform infrared spectroscopy and X-ray diffraction were used to characterize the corrosion products of zinc. In the absence of SO2, simonkolleite, Zn5(OH)8Cl2 � H2O and zincite, ZnO are the dominant corrosion products, while zinc hydroxysulfate (Zn4SO4(OH)6 � 3H2O), zinc chloride sulfate hydroxide hydrate (Zn12(SO4)3Cl3 �ð OHÞ15 � 5H2O) and simonkolleite dominate in the presence of SO2. Brief discussion on the mechanisms of atmospheric corrosion under these conditions was introduced. 2002 Elsevier Science Ltd. All rights reserved.

Effects of NaCl and SO 2 on the initial atmospheric corrosion of zinc

Corrosion behavior of cold rolled steel in artificial seawater in the presence of Bacillus subtilis C2

Effects of NaCl and NH4Cl on the initial atmospheric corrosion of zinc

Bacillus cereus s-EPS as a dual bio-functional corrosion and scale inhibitor in artificial seawater.

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