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Yu Cheng, Srinivasa Rao Avula, Wei-Wei Gao, Dinesh Addla, Vijai Kumar Reddy Tangadanchu, Ling Zhang, Jian-Mei Lin, Cheng-He Zhou
A series of new potentially multi-targeting antimicrobial 2-aminothiazolyl quinolones were designed, synthesized and characterized by (1)H NMR, (13)C NMR, IR, MS and HRMS spectra. Bioactive assay manifested that some of the prepared compounds showed moderate to good antibacterial and antifungal activities. Noticeably, compound 10f could effectively inhibit the growth of B. typhi and MRSA with MIC values of 1 and 8 μg/mL, respectively. Experimental results revealed that compound 10f was membrane-active and had the ability to rapidly kill the tested strains and effectively prevent the development of bacterial resistance...
October 7, 2016: European Journal of Medicinal Chemistry
Shakeela Yasmeen, Sajjad Hussain Sumrra, Muhammad Safwan Akram, Zahid H Chohan
A novel series of thiophene derived Schiff bases and their transition metal- [Co(II), Cu(II), Zn(II), Ni(II)] based compounds are reported. The Schiff bases act as tridentate ligands toward metal ions via azomethine-N, deprotonated-N of ammine substituents and S-atom of thienyl moiety. The synthesized ligands along with their metal complexes were screened for their in vitro antibacterial activity against six bacterial pathogens (Escherichia coli, Shigella flexneri, Pseudomonas aeruginosa, Salmonella typhi, Staphylococcus aureus and Bacillus subtilis) and for antifungal activity against six fungal pathogens (Trichophytonlongifusus, Candida albicans, Aspergillus flavus, Microsporum canis, Fusarium solani and Candida glabrata)...
October 21, 2016: Journal of Enzyme Inhibition and Medicinal Chemistry
Parveen Kumari, B S Khatkar
Phenolic content, antioxidant activities and antimicrobial activities of methanolic, ethanolic and ethyl acetate extracts of five different varieties of aonla (Emblica officinalis) fruits as well their powders were evaluated. Total polyphenolic content in fresh aonla fruit extracts varied from 70.6 to 159.4 mg GAE/g and their EC 50 (effective concentration) values for antioxidant activity ranged from 46.72 to 359.7 µg/ml. Significant varietal difference were observed in antioxidant activity of the extracts of fresh aonla fruit and powder...
July 2016: Journal of Food Science and Technology
Haifang Zhang, Yunxia Zhu, Xiaofang Xie, Min Wang, Hong Du, Shungao Xu, Ying Zhang, Mingyu Gong, Bin Ni, Huaxi Xu, Xinxiang Huang
The linear plasmid pBSSB1 mediates the flagellar phase variation in H:z66 positive Salmonella enterica serovar Typhi (S. Typhi). The gene named stp17 (S. Typhi plasmid number 17 gene) is located on pBSSB1 and encodes the protein STP17. The expression pattern at the protein-level and function of STP17 remains unknown. In this study, the recombinant protein STP17His6 was expressed, purified and used to prepare the polyclonal anti-STP17 antibody. We detected protein-level expression of stp17 in S. Typhi and further investigated the protein expression characteristics of stp17 in different growth phases by western blot analysis...
2016: Frontiers in Cellular and Infection Microbiology
H Memona, F Manzoor, A A Anjum
This study focuses on isolation of pathogenic bacteria from external and internal surfaces of cockroaches collected from houses and hospitals in Lahore. In total, 240 adult cockroaches were collected from houses and hospitals by hand or using sticky traps and food-bait traps. Cockroach species were identified, and microbial screening was done for external surfaces and gut tracts of cockroaches. Jaccard's index of similarity, Bray-Curtis' index of dissimilarity, and Shannon-Wiener's diversity index were used to measure the bacterial community diversity (all species of bacteria) in each habitat...
October 15, 2016: Journal of Medical Entomology
Rapeephan R Maude, Aniruddha Ghose, Rasheda Samad, Hanna K de Jong, Masako Fukushima, Lalith Wijedoru, Mahtab Uddin Hassan, Md Amir Hossain, Md Rezaul Karim, Abdullah Abu Sayeed, Stannie van den Ende, Sujat Pal, A S M Zahed, Wahid Rahman, Rifat Karnain, Rezina Islam, Dung Thi Ngoc Tran, Tuyen Thanh Ha, Anh Hong Pham, James I Campbell, H Rogier van Doorn, Richard J Maude, Tom van der Poll, W Joost Wiersinga, Nicholas P J Day, Stephen Baker, Arjen M Dondorp, Christopher M Parry, Md Abul Faiz
BACKGROUND: Fever is a common cause of hospital admission in Bangladesh but causative agents, other than malaria, are not routinely investigated. Enteric fever is thought to be common. METHODS: Adults and children admitted to Chittagong Medical College Hospital with a temperature of ≥38.0 °C were investigated using a blood smear for malaria, a blood culture, real-time PCR to detect Salmonella Typhi, S. Paratyphi A and other pathogens in blood and CSF and an NS1 antigen dengue ELISA...
October 13, 2016: BMC Infectious Diseases
Kumar V Br, Kishore D, Diwaker A, Yadav V, Tiwari A
No abstract text is available yet for this article.
January 2016: Journal of the Association of Physicians of India
Manoj Gowda A, Nithin Rao, Ranjit Mohan
No abstract text is available yet for this article.
January 2016: Journal of the Association of Physicians of India
Jill Koshiol, Aniela Wozniak, Paz Cook, Christina Adaniel, Johanna Acevedo, Lorena Azócar, Ann W Hsing, Juan C Roa, Marcela F Pasetti, Juan F Miquel, Myron M Levine, Catterina Ferreccio
In Chile, where gallbladder cancer (GBC) rates are high and typhoid fever was endemic until the 1990s, we evaluated the association between Salmonella enterica serovar Typhi (S. Typhi) antibodies and GBC. We tested 39 GBC cases, 40 gallstone controls, and 39 population-based controls for S. Typhi Vi antibodies and performed culture and quantitative polymerase chain reaction for the subset with bile, gallstone, tissue, and stool samples available. We calculated gender and education-adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for the association with GBC...
October 11, 2016: Cancer Medicine
Pamela Vazquez-Gutierrez, Tomas de Wouters, Julia Werder, Christophe Chassard, Christophe Lacroix
The gut microbiota plays an important role in host health, in particular by its barrier effect and competition with exogenous pathogenic bacteria. In the present study, the competition of Bifidobacterium pseudolongum PV8-2 (Bp PV8-2) and Bifidobacterium kashiwanohense PV20-2 (Bk PV20-2), isolated from anemic infant gut microbiota and selected for their high iron sequestration properties, was investigated against Salmonella Typhimurium (S. Typhi) and Escherichia coli O157:H45 (EHEC) by using co-culture tests and assays with intestinal cell lines...
2016: Frontiers in Microbiology
Vanessa K Wong, Stephen Baker, Thomas R Connor, Derek Pickard, Andrew J Page, Jayshree Dave, Niamh Murphy, Richard Holliman, Armine Sefton, Michael Millar, Zoe A Dyson, Gordon Dougan, Kathryn E Holt
The population of Salmonella enterica serovar Typhi (S. Typhi), the causative agent of typhoid fever, exhibits limited DNA sequence variation, which complicates efforts to rationally discriminate individual isolates. Here we utilize data from whole-genome sequences (WGS) of nearly 2,000 isolates sourced from over 60 countries to generate a robust genotyping scheme that is phylogenetically informative and compatible with a range of assays. These data show that, with the exception of the rapidly disseminating H58 subclade (now designated genotype 4...
October 5, 2016: Nature Communications
Christina V Sathyanathan, B Jyothirmayi, Lakshmi R Sundaram, P A Abhinand, R Eswaramoorthy, K Mary Elizabeth Gnanambal
AIMS: This investigation is designed to evaluate the antibacterial efficiency of the noodle grass, Syringodium isoetifolium, which is commonly occurring in the Indian coastal waters. Also this study characterizes the active compound and predicts the mode of action, in silico. METHODS AND RESULTS: Human pathogenic bacteria were treated with crude metabolites of S. isoetifolium. The potent fraction, b was analyzed by UV/VIS, RP-HPLC, FT-IR, ESI-Mass, (1) H and (13) C NMRs and determined to be a hydrate of Pheophytin a [C55 H74 N4 O6 ]...
October 4, 2016: Journal of Applied Microbiology
Lidwina Faraline Triprisila, Suharjono Suharjono, Antonius Christianto, Fatchiyah Fatchiyah
BACKGROUND: Goat milk is reported to have antimicrobial activity of several pathogen bacteria that contained on food materials. The research related with antimicrobial activity of Alpha-S2 casein from goat milk is relatively less than other casein components. Herein, we reported the antimicrobial activity of caprine Alpha-S2 Casein (CSN1S2) protein from Ethawah breed goat milk and yoghurt in Gram positive (Listeria monocytogenes, Staphylococcus aureus and Bacillus cereus) and negative pathogen bacteria (Escherichia coli, Salmonella typhi and Shigella flexneri)...
July 24, 2016: Materia Socio-medica
Kristen E Rennoll-Bankert, M Sayeedur Rahman, Mark L Guillotte, Stephanie S Lehman, Magda Beier-Sexton, Joseph J Gillespie, Abdu F Azad
Rickettsiae are obligate intracellular pathogens that induce their uptake into non-phagocytic cells; however, the events instigating this process are incompletely understood. Importantly, diverse Rickettsia species are predicted to utilize divergent mechanisms to colonize host cells, as nearly all adhesins and effectors involved in host cell entry are differentially encoded in diverse Rickettsia species. One particular effector, RalF, a sec-7 domain containing protein that functions as a guanine nucleotide exchange factor of ADP-ribosylation factors (Arfs), is critical for R...
October 3, 2016: Infection and Immunity
Stefanie Papp, Jessica Rauch, Svenja Kuehl, Ulricke Richardt, Christian Keller, Anke Osterloh
Rickettsioses are caused by intracellular bacteria of the family of Rickettsiaceae. Rickettsia (R.) typhi is the causative agent of endemic typhus. The disease occurs worldwide and is one of the most prevalent rickettsioses. Rickettsial diseases, however, are generally underdiagnosed which is mainly due to the lack of sensitive and specific methods. In addition, methods for quantitative detection of the bacteria for research purposes are rare. We established two qPCRs for the detection of R. typhi by amplification of the outer membrane protein B (ompB) and parvulin-type PPIase (prsA) genes...
October 1, 2016: Medical Microbiology and Immunology
G Devanand Venkatasubbu, R Baskar, T Anusuya, C Arun Seshan, Ramachandran Chelliah
Food preservation is an important field of research. It extends the shelf life of major food products. Our current study is based on food preservation through TiO2 and ZnO nanoparticles. TiO2 and ZnO are biocompatible nanomaterial. The biocompatibility of the materials were established through toxicity studies on cell lines. Titanium dioxide and Zinc Oxide nanoparticle were synthesized by wet chemical process. They are characterized by X-Ray diffraction and TEM. The antibacterial activities of both the materials were analysed to ensure their effectiveness as food preservative against Salmonella typhi, Klebsiella pneumoniae and Shigella flexneri...
September 28, 2016: Colloids and Surfaces. B, Biointerfaces
César García Vera, María García Ventura, Guadalupe Del Castillo Aguas, Begoña Domínguez Aurrecoechea, María Jesús Esparza Olcina, Ana Martínez Rubio, José María Mengual Gil
OBJECTIVE: To determine the main clinical and epidemiological features of bacterial gastroenteritis in our environment. PATIENTS AND METHODS: An observational study of a Spanish population in 17 Autonomous Communities. Questionnaires of children with a stool positive culture to bacteria were collected over a one year period. A bivariate analysis was performed on the variables involved, as well as two multivariate models (for antibiotic treatment variables, and comparison Campylobacter/Salmonella)...
September 26, 2016: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
Madhusudana Pulaganti, Anuradha C M, Chitta Suresh Kumar
Pseudomonas aeruginosa (P.aeruginosa) is an opportunistic microorganism causing diseases both in animals and humans. In case of human pathology, the role of P.aeruginosa is one of the major concerns in intensive care septicemia. Presently the drug resistance strains of P.aeruginosa are arising mainly by developing multiple mechanisms due to its natural and acquired resistance to many of the antimicrobial agents commonly used in clinical practice. As a result, there is a direneed to invent new drugs so that they may restrict the outbreak of multidrug resistant strains...
August 15, 2016: Journal of Biomolecular Structure & Dynamics
Jerusha A Hema, Rajkumari Malaka, Narayanan P Muthukumarasamy, Akilandeswari Sambandam, Subakanmani Subramanian, Murugan Sevanan
The biosynthesis of silver nanoparticles (AgNPs) has been proved to be a cost effective and environmental friendly approach toward chemical and physical methods. In the present study, biosynthesis of AgNPs was carried out using aqueous extract of Zea mays (Zm) husk. The initial colour change from golden yellow to orange was observed between 410 and 450 nm which confirmed the synthesis of AgNPs. Also, dynamic light scattering-particle size analysis confirmed the average size to be 113 nm and zeta potential value of -28 kV...
October 2016: IET Nanobiotechnology
Madushini N Dharmasena, Catherine M Feuille, Carly Elizabeth C Starke, Arvind A Bhagwat, Scott Stibitz, Dennis J Kopecko
The licensed oral, live-attenuated bacterial vaccine for typhoid fever, Salmonella enterica serovar Typhi strain Ty21a, has also been utilized as a vaccine delivery platform for expression of diverse foreign antigens that stimulate protection against shigellosis, anthrax, plague, or human papilloma virus. However, Ty21a is acid-labile and, for effective oral immunization, stomach acidity has to be either neutralized with buffer or by-passed with Ty21a in an enteric-coated capsule (ECC). Several studies have shown that efficacy is reduced when Ty21a is administered in an ECC versus as a buffered liquid formulation, the former limiting exposure to GI tract lymphoid tissues...
2016: PloS One
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