8 research outputs found
Diversity and Bioactivity of Endophytic Fungi from Nothapodyte foetida (Wt.) Sleumer and Hypericum mysorense Heyne
Endophytic fungi were isolated from the medicinal plants Nothapodyte foetida and Hypericum mysorense, collected from the cold peaks of the Western Ghats of India, which is considered as one among ten important biodiversity hotspots of the world. The diversity of foliar endophytic biota in both plants was assessed using various indices. Endophytes were screened for the antimicrobial and free radical-scavenging activity. Ethyl acetate extracts of the culture broths of two isolates Bionectria ochroleuca NOTL33 from N. foetida and Chaetomium globosum HYML55 from H. mysorense were further characterized for their composition and minimum inhibitory concentrations (MIC) based on their significant activities during primary screening. MIC of both extracts ranged from 78 to 625 μg/ml, with the exception of Pseudomonas aeruginosa (5 mg/ml). 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2, 2'-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) free radical quenching by the extracts were dose dependent. 2-heptanone, furfural, methyl furfural, benzyl pentyl ketone, benzyl decanoate, amyl isovalerate and palmitic acid were identified in NOTL33 extract by gas chromatography–mass spectrometry (GC-MS) analysis. A yellow amorphous powder (HYML 8A) was purified from HYML55 extract and further characterized for MIC and minimum cidal concentrations against the test bacteria. The yield of the compound in different media was estimated
Synthesis, biological evaluation and molecular docking studies of novel 2-(2-cyanophenyl)-N-phenylacetamide derivatives
Acid Activated Indian Bentonite, an Efficient Catalyst for Esterification of Carboxylic Acids
Metallic magnesium: an efficient catalyst toward N-aryl and N-alkyl substituted amides directly from aliphatic carboxylic acids
Bionectria ochroleuca NOTL33—an endophytic fungus from Nothapodytes foetida producing antimicrobial and free radical scavenging metabolites
Vanillic aldehydes for the one-pot synthesis of novel 2-oxo-1,2,3,4-tetrahydropyrimidines
The Family Rhodobacteraceae
The family Rhodobacteraceae can be considered a paradigm of modern taxonomy of prokaryotes. Taking into account the number of species and genera that conforms the family, together with the knowledge about their abundance and vast global distribution, it surprises that most of them have been described relatively recent to our days. Two notable exceptions are Rhodonostoc capsulatum (Molisch, Die purpurbakterien nach neuen untersuchungen, vols i–vii. G. Fischer, Jena, pp 1–95, 1907) and Micrococcus denitrificans Beijerinck and Minkman (Zentbl Bakteriol, Parasitenkd, Infektionskr Hyg. Abt II 25:30–63, 1910), early basonyms of Rhodobacter capsulatus and Paracoccus denitrificans, respectively. The fact that so many descriptions within this family are recent means that some studies have been concomitant and pose a challenge not only for pure taxonomic studies but also for interpreting other studies in which a rapidly evolving nomenclature had to be used anyway. The metabolic and ecological diversity of the group adds further complexity. In spite of all these difficulties, the picture is far from being a chaos and it can be considered an exciting and important bacterial group to study.
Rhodobacteraceae are, fundamentally, aquatic bacteria that frequently thrive in marine environments. They comprise mainly aerobic photo- and chemoheterotrophs but also purple non-sulfur bacteria which perform photosynthesis in anaerobic environments. They are deeply involved in sulfur and carbon biogeochemical cycling and symbiosis with aquatic micro- and macroorganisms.
One hundred genera are currently recognized as members of the family although the Stappia group, Ahrensia, Agaricicola, and Rhodothalassium do not belong, phylogenetically, to the family. The 90 other genera are distributed in 5 phylogenetic groups (the Rhodobacter, the Paracoccus, the Rhodovulum, the Amaricoccus, and the Roseobacter clades) that might be considered a family on its own