Browsing by Author "Rehman, Wahid Ul"

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    First report of Zoanthus pulchellus from India
    (AMET University, 2015) Mehra, Richa; Yadav, Digvijay Singh; Kundu, Pushpendra; Rehman, Wahid Ul; Bast, Felix
    The marine ecosystem carries immense undescribed organisms having huge potential uses for mankind. The zoanthids, classified under phylum Cnidaria, are mostly found in shallow waters, below the low tide mark. Based on morphological features, we identified a zoanthid during an expedition to Kanyakumari. Thorough examination of the color variations, polyp length, tentacle number, colony appearance and comparison with previously reported species of the genus, suggests that the species is Zoanthus pulchellus. This is the first report of this species from India.
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    Green Synthesis of TiO2 Nanoparticles Using Acorus calamus Leaf Extract and Evaluating its Photocatalytic and In Vitro Antimicrobial Activity
    (MDPI, 2022-01-31T00:00:00) Ansari, Afzal; Siddiqui, Vasi Uddin; Rehman, Wahid Ul; Akram, Md. Khursheed; Siddiqi, Weqar Ahmad; Alosaimi, Abeer M.; Hussein, Mahmoud A.; Rafatullah, Mohd
    Here, we present an innovative and creative sustainable technique for the fabrication of titania (TiO2) using Acorus calamus (A. calamus) leaf extract as a new biogenic source, as well as a capping and reducing agent. The optical, structural, morphological, surface, and thermal character-istics of biosynthesized nanoparticles were investigated using UV, FTIR, SEM, DLS, BET, and TGA-DSC analysis. The phase formation and presence of nanocrystalline TiO2 were revealed by the XRD pattern. FTIR analysis revealed conjugation, as well as the presence of Ti�O and O�H vibrational bands. The nanoparticles were noticed to be globular, with an average size of 15�40 nm, according to the morphological analysis, and the impact of size quantification was also investigated using DLS. The photocatalytic activity of bare, commercial P-25 and biosynthesized TiO2 (G-TiO2) nano-particles in aqueous solution of rhodamine B (RhB) dye was investigated under visible light irradiation at different time intervals. The biosynthesized TiO2 nanoparticles exhibited strong photocata-lytic activity, degrading 96.59% of the RhB dye. Different kinetic representations were utilized to analyze equilibrium details. The pseudo-first-order reaction was best suited with equilibrium rate constant (K1) and regression coefficients (R2) values 3.72 � 10?4 and 0.99, respectively. The antimi-crobial efficacy of the prepared nanoparticles was investigated using the disc diffusion technique. Further, biosynthesized TiO2 showed excellent antimicrobial activity against the selected gram-pos-itive staining (B. subtilis, S. aureus) over gram-negative (P. aeruginosa, E. coli) pathogenic bacteria in comparison to bare TiO2. � 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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    Green Synthesis of TiO2 Nanoparticles Using Acorus calamus Leaf Extract and Evaluating its Photocatalytic and In Vitro Antimicrobial Activity
    (MDPI, 2022-01-31T00:00:00) Ansari, Afzal; Siddiqui, Vasi Uddin; Rehman, Wahid Ul; Akram, Md. Khursheed; Siddiqi, Weqar Ahmad; Alosaimi, Abeer M.; Hussein, Mahmoud A.; Rafatullah, Mohd
    Here, we present an innovative and creative sustainable technique for the fabrication of titania (TiO2) using Acorus calamus (A. calamus) leaf extract as a new biogenic source, as well as a capping and reducing agent. The optical, structural, morphological, surface, and thermal character-istics of biosynthesized nanoparticles were investigated using UV, FTIR, SEM, DLS, BET, and TGA-DSC analysis. The phase formation and presence of nanocrystalline TiO2 were revealed by the XRD pattern. FTIR analysis revealed conjugation, as well as the presence of Ti�O and O�H vibrational bands. The nanoparticles were noticed to be globular, with an average size of 15�40 nm, according to the morphological analysis, and the impact of size quantification was also investigated using DLS. The photocatalytic activity of bare, commercial P-25 and biosynthesized TiO2 (G-TiO2) nano-particles in aqueous solution of rhodamine B (RhB) dye was investigated under visible light irradiation at different time intervals. The biosynthesized TiO2 nanoparticles exhibited strong photocata-lytic activity, degrading 96.59% of the RhB dye. Different kinetic representations were utilized to analyze equilibrium details. The pseudo-first-order reaction was best suited with equilibrium rate constant (K1) and regression coefficients (R2) values 3.72 � 10?4 and 0.99, respectively. The antimi-crobial efficacy of the prepared nanoparticles was investigated using the disc diffusion technique. Further, biosynthesized TiO2 showed excellent antimicrobial activity against the selected gram-pos-itive staining (B. subtilis, S. aureus) over gram-negative (P. aeruginosa, E. coli) pathogenic bacteria in comparison to bare TiO2. � 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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    Morphophylogenetic assessment of a new moss species Bryum bharatiense sp. nov. (Bryaceae) from Larsemann Hills, Eastern Antarctica
    (National Science Museum od Korea, 2021-07-16T00:00:00) Rehman, Wahid Ul; Gupta, Kriti; Bast, Felix
    Bryum is recognized as a cosmopolitan genus of mosses in the family Bryaceae that contains the largest diversity of mosses. Although there are around 100 species of moss species reported from Antarctica to date, the actual species diversity remains elusive, as the continent remains one of the least explored habitats globally. Here, we describe a new species of Bryum from the Larsemann Hills, Eastern Antarctica, with several synapomorphic characters, including unbranched plant body, ovate-lanceolate leaves, reflexed leaf margins with slightly serrulate apex, and percurrent coasta. In nuclear ribosomal DNA internal transcribed spacer 1 phylogram, our isolate did not cluster with any known species of this genus. The closest BLASTn hit was found to be Bryum pseudotriquetrum, but our isolate had several distinct synapomorphic traits. Based on morphological and molecular data, a new moss species, Bryum bharatiense sp. nov. is formally proposed herein. Besides, two new taxonomic records are also presented in this study, viz. Bryoerythrophyllum recurvirostrum from Larsemann Hills and Coscinodon lawianus from Schirmacher Oasis. � 2021 National Science Museum of Korea (NSMK) and Korea National Arboretum (KNA)
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    Morphophylogenetic assessment of a new moss species Bryum bharatiense sp. nov. (Bryaceae) from Larsemann Hills, Eastern Antarctica
    (National Science Museum od Korea, 2021-07-16T00:00:00) Rehman, Wahid Ul; Gupta, Kriti; Bast, Felix
    Bryum is recognized as a cosmopolitan genus of mosses in the family Bryaceae that contains the largest diversity of mosses. Although there are around 100 species of moss species reported from Antarctica to date, the actual species diversity remains elusive, as the continent remains one of the least explored habitats globally. Here, we describe a new species of Bryum from the Larsemann Hills, Eastern Antarctica, with several synapomorphic characters, including unbranched plant body, ovate-lanceolate leaves, reflexed leaf margins with slightly serrulate apex, and percurrent coasta. In nuclear ribosomal DNA internal transcribed spacer 1 phylogram, our isolate did not cluster with any known species of this genus. The closest BLASTn hit was found to be Bryum pseudotriquetrum, but our isolate had several distinct synapomorphic traits. Based on morphological and molecular data, a new moss species, Bryum bharatiense sp. nov. is formally proposed herein. Besides, two new taxonomic records are also presented in this study, viz. Bryoerythrophyllum recurvirostrum from Larsemann Hills and Coscinodon lawianus from Schirmacher Oasis. � 2021 National Science Museum of Korea (NSMK) and Korea National Arboretum (KNA)