scholarly journals Characterization of the rcsA and rcsB genes from Salmonella typhi: rcsB through tviA is involved in regulation of Vi antigen synthesis.

1996 ◽  
Vol 178 (6) ◽  
pp. 1691-1698 ◽  
Author(s):  
I Virlogeux ◽  
H Waxin ◽  
C Ecobichon ◽  
J O Lee ◽  
M Y Popoff
Keyword(s):  
Salmonella Typhi ◽  
Vi Antigen

scholarly journals Facile Synthesis and Characterization of Palm CNF-ZnO Nanocomposites with Antibacterial and Reinforcing Properties

2021 ◽  
Vol 22 (11) ◽  
pp. 5781
Author(s):  
Janarthanan Supramaniam ◽  
Darren Yi Sern Low ◽  
See Kiat Wong ◽  
Loh Teng Hern Tan ◽  
Bey Fen Leo ◽  
...  
Keyword(s):  
Plant Biomass ◽  
Cellulose Nanofibers ◽  
High Strength ◽  
Salmonella Typhi ◽  
Particle Sizes ◽  
Mechanical Reinforcement ◽  
Uniform Size ◽  
Preparation Methods ◽  
Potential Applications

Cellulose nanofibers (CNF) isolated from plant biomass have attracted considerable interests in polymer engineering. The limitations associated with CNF-based nanocomposites are often linked to the time-consuming preparation methods and lack of desired surface functionalities. Herein, we demonstrate the feasibility of preparing a multifunctional CNF-zinc oxide (CNF-ZnO) nanocomposite with dual antibacterial and reinforcing properties via a facile and efficient ultrasound route. We characterized and examined the antibacterial and mechanical reinforcement performances of our ultrasonically induced nanocomposite. Based on our electron microscopy analyses, the ZnO deposited onto the nanofibrous network had a flake-like morphology with particle sizes ranging between 21 to 34 nm. pH levels between 8–10 led to the formation of ultrafine ZnO particles with a uniform size distribution. The resultant CNF-ZnO composite showed improved thermal stability compared to pure CNF. The composite showed potent inhibitory activities against Gram-positive (methicillin-resistant Staphylococcus aureus (MRSA)) and Gram-negative Salmonella typhi (S. typhi) bacteria. A CNF-ZnO-reinforced natural rubber (NR/CNF-ZnO) composite film, which was produced via latex mixing and casting methods, exhibited up to 42% improvement in tensile strength compared with the neat NR. The findings of this study suggest that ultrasonically-synthesized palm CNF-ZnO nanocomposites could find potential applications in the biomedical field and in the development of high strength rubber composites.

In vitro characterization of Salmonella typhi mutant strains for live oral vaccines

Vaccine ◽  
1990 ◽  
Vol 8 (3) ◽  
pp. 263-268 ◽  
Author(s):  
Evgenia M. Dragunsky ◽  
Evelyn Rivera ◽  
H. Donald Hochstein ◽  
Inessa S. Levenbook
Keyword(s):  
Salmonella Typhi ◽  
Oral Vaccines ◽  
In Vitro Characterization ◽  
Mutant Strains

scholarly journals Synthesis and Characterization of the Antibacterial Activity of Zinc Oxide Nanoparticles against Salmonella typhi

2016 ◽  
Vol 29 (7) ◽  
pp. 601-608 ◽  
Author(s):  
Rafieh Meraat ◽  
Ali Abdolahzadeh Ziabari ◽  
Khosro Issazadeh ◽  
Nima Shadan ◽  
Kamyar Mazloum Jalali
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Zinc Oxide Nanoparticles ◽  
Salmonella Typhi ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles

scholarly journals In VitroAntibacterial, Antioxidant, and Cytotoxic Activities ofParthenium hysterophorusand Characterization of Extracts by LC-MS Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Shashank Kumar ◽  
Sanjay Pandey ◽  
Abhay K. Pandey
Keyword(s):  
Cell Lines ◽  
Cancer Cell ◽  
Biological Activities ◽  
Beta Carotene ◽  
Cancer Cell Lines ◽  
Salmonella Typhi ◽  
Cytotoxic Activities ◽  
Plant Parts ◽  
Colon Cancer Cell Lines

Present work reports the biological activities ofP. hysterophorusleaf, stem, flower, and root. Dried samples were sequentially extracted with many solvents. Hexane (HX), benzene (BZ), and chloroform (CH) extracts of leaf showed considerable antibacterial activity againstStreptococcus mutans(MTCC 497),Proteus vulgaris(MTCC 7299), andSalmonella typhi(MTCC 3917). Flower extracts exhibited presence of higher amount of flavonoids (13.9–59.6 μgQE/mg) followed by leaf, stem, and root. Stem (HX, BZ, and CH), leaf ethanol (ET), and root (HX, BZ, and CH) fractions showed noticeable antioxidant capacity in phosphomolybdate assay. Most of the extracts demonstrated beta carotene bleaching inhibition capability. BZ, ethyl acetate (EA), and ET fractions of leaves, stem aqueous (AQ), and flower EA extracts showed membrane protective activities (40–55%). Middle fractions of the plant parts displayed moderate antihemolytic potential. Most of the flower extracts exhibited cytotoxic activity (80–100%) against lung and colon cancer cell lines. Root (HX and ET) and leaf ET extracts showed considerable inhibition (90–99%) of colon and ovary cancer cell lines. The LC-MS scan demonstrated presence of different compounds showing 3–20 min retention time. The study revealed considerable antibacterial, antioxidant, lipo-protective, antihemolytic, and anticancer potential in all parts ofP. hysterophorus.

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