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Gram negative

Regina Leber, Michael Pachler, Ivo Kabelka, Irene Svoboda, Daniel Enkoller, Robert Vácha, Karl Lohner, Georg Pabst
Mixtures of the frog peptides magainin 2 and PGLa are well-known for their pronounced synergistic killing of Gram-negative bacteria. We aimed to gain insight into the underlying biophysical mechanism by interrogating the permeabilizing efficacies of the peptides as a function of stored membrane curvature strain. For Gram-negative bacterial-inner-membrane mimics, synergism was only observed when the anionic bilayers exhibited significant negative intrinsic curvatures imposed by monounsaturated phosphatidylethanolamine...
April 24, 2018: Biophysical Journal
Meriem Drissa, Sana Helali, Marwa Chebbi, Khaled Ezzaouia, Fadwa Omri, Habiba Drissa
BACKGROUND: The prosthetic valve endocarditis(PVE) is a serious complication of valve replacement surgery. The aim of this work was to analyze the clinical and echocardiography characters of the PVE, deduce surgery indication, and determinate the prognostic factors Methods :We presented a retrospective descriptive study from 2000 to 2014 which included 30 patients hospitalized in department of cardiology in la Rabta hospital for certain PVE according to DUCKES criteria. RESULTS: Our study consisted of 18 male patients with sex ratio of 1...
July 2017: La Tunisie Médicale
I D S L Pio, A L Lavor, C M D Damasceno, P M N Menezes, F S Silva, G L A Maia
This study aimed to carry out an ethnobotanical survey of medicinal plants used by inhabitants of the Rodeadouro Island, Jatoba Island and Massangano Island, located in The Submedium São Francisco River Valley. Also phytochemicals and preliminary pharmacological tests were performed to species most cited by the community. Ethnobotanical data were collected through observation visits and semi-structured interviews with 12 key informants. We calculated the relative importance (RI), the percentage of agreement related to the main uses (cAMU) and use value (UV)...
April 19, 2018: Brazilian Journal of Biology, Revista Brasleira de Biologia
Samvel N Sirakanyan, Athina Geronikaki, Domenico Spinelli, Elmira K Hakobyan, Viktor G Kartsev, Anthi Petrou, Anush A Hovakimyan
Annulated thienopyrimidine derivatives attracted big interest of the scientific community due to their broad spectrum of biological activities among which are the inhibition of phosphodiesterase, antiproliferative and antimicrobial activities. As a continuation of our studies on the synthesis and biological activity of fused thieno[3,2-d]pyrimidine derivatives, the goal of this paper is the synthesis and study of the properties of compounds containing different heterocycles such as fused thieno[2,3-b]pyridine and tetrazolo[1,5-c]pyrimidine in the same molecule...
April 23, 2018: Anais da Academia Brasileira de Ciências
Lijun Xi, Nenghu Qiao, Dejian Liu, Jing Li, Jingjing Zhang, Jianguo Liu
Two bacterial strains were isolated from coal mine water in China. Isolates were facultatively anaerobic, Gram-stain-negative, rod-shaped, motile by means of a single polar flagellum, and they did not produce bacteriochlorophyll α. Cells grew in tryptic soy broth with 0-5.5 % (w/v) NaCl, at 4-55 °C and pH 3.5-10.5. Isolates were positive for catalase, oxidase, urease, Voges-Proskauer test, gelatin hydrolysis and H2S production. Analysis of 16S rRNA gene sequences indicated that the closest relatives of strains Q4...
April 25, 2018: International Journal of Systematic and Evolutionary Microbiology
Heeyoung Kang, Inseong Cha, Haneul Kim, Kiseong Joh
A novel strain, designated HMF3095T , isolated from freshwater of a mesotrophic artificial lake in the Republic of Korea, was characterized by polyphasic taxonomy. The cells were Gram-stain-negative, aerobic, non-motile, straight rods and formed reddish colonies. Phylogenetic analysis based on its 16S rRNA gene sequence revealed that strain HMF3095T fell within the cluster of the genus Hymenobacterand was most closely related to Hymenobacter seoulensis 16F7GT and Hymenobacter tenuis POB6T (96.7 % sequence similarity)...
April 25, 2018: International Journal of Systematic and Evolutionary Microbiology
C-C Chao, B O Ingram, W Lurchachaiwong, W-M Ching
Scrub typhus is an acute zoonosis caused by the obligate intracellular Gram-negative bacterium Orientia tsutsugamushi. To better understand the host response elicited by natural infection by chigger feeding, ICR mice were infected by Leptotrombidium chiangraiensis (Lc1) chiggers, and the metabolic profiles of their serum were examined over several time points after initiation of feeding. ICR mice were infected by either naive Lc1 chiggers (i.e. not infected by O. tsutsugamushi, NLc1) or O. tsutsugamushi -infected Lc1 chiggers (OLc1)...
May 2018: New Microbes and New Infections
Jayanthi Siva Subramaniyan, Jeya Meenakshi Sundaram
CONTEXT: ICU shows increasing incidence of infection associated with the use of invasive procedures for the diagnostic purpose as well as the indiscriminate use of antibiotics. Pseudomonas aeruginosa and Acinetobacter species are "very successful" pathogen and the emergence of the Metallo-β-Lactamases (MBL) is becoming a therapeutic challenge. AIMS: To isolate the Nonfermenting Gram negative bacilli from the ICU samples. To identify the metallo betalactamase producers and to detect the bla gene presence among the Pseudomonas aeruginosa and Acinetobacter baumannii ...
April 2018: Journal of Laboratory Physicians
Twisha S Patel, Jason M Pogue, John P Mills, Keith S Kaye
Meropenem-vaborbactam is a fixed-dose combination product of a carbapenem and a cyclic boronic acid β-lactamase inhibitor with potent in vitro activity against Klebsiella pneumoniae carbapenemase-producing carbapenem-resistant Enterobacteriaceae (CRE). The efficacy of meropenem-vaborbactam for the treatment of complicated urinary tract infections and acute pyelonephritis was demonstrated in a Phase III trial (TANGO I). Preliminary data from TANGO II, a separate Phase III study, support the efficacy of meropenem-vaborbactam for the treatment of infections caused by CRE...
April 25, 2018: Future Microbiology
Guo Chang Ding, Xiao Hua Wang, Qi Fan Yang, Qun Xing Lin, Zhi Qun Huang
We employed a comparative study to examine the effects of tree species transition on soil microbial biomass, community composition and enzymes activities under Cunninghamia lanceolata (Lamb.) Hook, Eucalyptus grandis and a N-fixing species, Acacia melanoxylon in subtropical China. Results showed that the effect of tree species on soil microbial community and enzymes activities was significant only in the 0-10 cm soil layer. Reforestation with N-fixing species A. melanoxylon on the C. lanceolata harvest site significantly increased the total phospholipid fatty acid (PLFA), fungal PLFAs, Gram-positive bacterial PLFAs, Gram-negative bacterial PLFAs and actinomycetes biomasses in the 0-10 cm soil layer...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Anja Sofie Petersen, Frederik Federspiel, Arnold Dungu, Christian Søborg
This is a case report of a 56-year-old man, who presented with a very rare cause of erysipelas and bacteraemia caused by the Gram-negative bacillus Shewanella algae. To our knowledge, this is the first reported case of imported Shewanella-infection in Denmark. The patient, who had a history of liver cirrhosis, returned home from a one-month vacation in Thailand. All four blood cultures were positive for S. algae. The patient was treated successfully with IV meropenem and oral ciprofloxacin. S. algae can cause severe local and systemic infection and is not sensitive to standard treatment with penicillin...
April 9, 2018: Ugeskrift for Laeger
Michael Owusu, Kwadwo Sarfo Marfo, Godfred Acheampong, Abednego Arthur, Nimako Sarpong, Justin Im, Ondari D Mogeni, Augustina Annan, Hsin-Ying Chiang, Chih-Horng Kuo, Se Eun Park, Florian Marks, Ellis Owusu-Dabo, Yaw Adu-Sarkodie
BACKGROUND: Neisseria gonorrhoeae is a Gram-negative bacterium which affects the urethra, throat, rectum and cervix of patients and often associated with sexually transmitted infections. The global epidemiology of the disease is not well characterised especially in resource constraint countries due to poor diagnostic capacity and inefficient reporting systems. Although important, little is known about the propensity of this bacterium to cause sepsis in immunocompetent individuals. CASE PRESENTATION: A 32-year-old female presented with fever and generalised malaise to a rural hospital in Ghana...
April 24, 2018: BMC Research Notes
Abdel-Rahim S Ibrahim, Khaled M Elokely, Daneel Ferreira, Amany E Ragab
Biotransformation of fusidic acid ( 1 ) was accomplished using a battery of microorganisms including Cunninghamella echinulata NRRL 1382, which converted fusidic acid ( 1 ) into three new metabolites 2 ⁻ 4 and the known metabolite 5 . These metabolites were identified using 1D and 2D NMR and HRESI-FTMS data. Structural assignment of the compounds was supported via computation of ¹H- and 13 C-NMR chemical shifts. Compounds 2 and 3 were assigned as the 27-hydroxy and 26-hydroxy derivatives of fusidic acid, respectively...
April 21, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Brett Boonen, Yeranddy A Alpizar, Alicia Sanchez, Alejandro López-Requena, Thomas Voets, Karel Talavera
Acute neurogenic inflammation and pain associated to bacterial infection have been traditionally ascribed to sensitization and activation of sensory nerve afferents secondary to immune cell stimulation. However, we recently showed that lipopolysaccharides (LPS) directly activate the Transient Receptor Potential channels TRPA1 in sensory neurons and TRPV4 in airway epithelial cells. Here we investigated whether LPS activates other sensory TRP channels expressed in sensory neurons. Using intracellular Ca2+ imaging and patch-clamp we determined the effects of LPS on recombinant TRPV1, TRPV2, TRPM3 and TRPM8, heterologously expressed in HEK293T cells...
April 14, 2018: Cell Calcium
S Rajaboopathi, S Thambidurai
In the present study, green synthesis of silver nanoparticles (AgNPs) functionalized with seaweed (Padina gymnospora) extract was investigated. Thus synthesized AgNPs were coated on cotton fabric by pad try-cure method using citric acid as a cross linking agent. The chemical linkage of colloidal AgNPs onto the cellulosic structure are characterized and confirmed by FTIR, SEM, EDX and AFM analysis. The optical, crystalline and morphological features of the functionalized AgNPs were confirmed by UV-Visible, X-ray diffraction and TEM analysis...
April 18, 2018: Journal of Photochemistry and Photobiology. B, Biology
Jing-Yang Li, Shang-Qin Chen, Yan-Yan Yan, Ying-Ying Hu, Jia Wei, Qiu-Ping Wu, Zhen-Lang Lin, Jing Lin
OBJECTIVES: The purpose of the study is to analyze the distribution and antimicrobial resistance of common bacterial pathogens causing neonatal septicemia based on a systematic review of the published studies in China. METHODS: Articles about neonatal sepsis published in the Chinese literature from 2009 to 2014 were identified according to the inclusion and exclusion criteria. Data were extracted and analyzed using Comprehensive Meta-Analysis software. RESULTS: A total of 71 studies were included in which a total of 8080 bacterial species were isolated from culture positive blood samples...
April 21, 2018: International Journal of Infectious Diseases: IJID
Zhibin Lu, Zhiming Ren, Changkao Mu, Ronghua Li, Yangfang Ye, Weiwei Song, Ce Shi, Lei Liu, Chunlin Wang
L-type lectins are involved in glycoprotein secretion and are associated with immune responses. Herein, an L-type lectin was identified in swimming crab (Portunus trituberculatus). The 1347 bp PtLTL cDNA includes a 26 bp 5'-untranslated region (UTR), a 547 bp 3'-UTR with a poly(A) tail, and a 774 bp open reading frame encoding a 257 amino acid protein with a putative 21 residue signalling peptide. The protein includes an L-type lectin carbohydrate recognition domain containing four conserved cysteines...
April 21, 2018: Gene
Marshall E Kadin, John Morgan, Haiying Xu, Alan L Epstein, David Sieber, Bradley A Hubbard, William P Adams, Carlos E Bacchi, Joao C S Goes, Mark W Clemens, L Jeffrey Medeiros, Roberto N Miranda
More than 500 women worldwide have developed a CD30+ T-cell lymphoma around breast implants, strongly suggesting a cause and effect relationship, and designated as breast implant-associated anaplastic large cell lymphoma (BIA-ALCL). The mechanism of lymphomagenesis is unknown. Recently, a bacterial biofilm containing gram negative bacilli was discovered on the surface of breast implants associated with ALCL. We and others have described overexpression of the proto-oncogene JUNB and mutations of JAK1/2, TP53 and STAT3 in BIA-ALCL...
April 21, 2018: Human Pathology
Lan-Bi Nie, Qin-Li Liang, Yang Zou, Yun-Hang Gao, Quan Zhao, Gui-Xue Hu, Xing-Quan Zhu
Chlamydia is Gram-negative obligate bacterium, which can cause human diseases worldwide and has huge economic impact on animals. It is yet to know whether farmed wild boars are infected with Chlamydia in China. To assess risk factors of Chlamydia infection in farmed wild boars in China, from April 2015 to February 2016, a total of 837 serum samples of farmed wild boars were collected in Jilin province, northeastern China, and antibodies against Chlamydia were examined by the indirect hemagglutination assay...
April 24, 2018: Vector Borne and Zoonotic Diseases
Apichai Srijan, Katie R Margulieux, Sirigade Ruekit, Erik Snesrud, Rosslyn Maybank, Oralak Serichantalergs, Rosarin Kormanee, Prawet Sukhchat, Jossin Sriyabhaya, Mary Hinkle, John M Crawford, Patrick McGann, Brett E Swierczewski
Multidrug-resistant Klebsiella pneumoniae strains are one of the most prevalent causes of nosocomial infections and pose an increasingly dangerous public health threat. The lack of remaining treatment options has resulted in the utilization of older drug classes, including colistin. As a drug of last resort, the discovery of plasmid-mediated colistin resistance by mcr-1 denotes the potential development of pandrug-resistant bacterial pathogens. To address the emergence of the mcr-1 gene, 118 gram-negative Enterobacteriaceae isolated from clinical samples collected at Queen Sirikit Naval Hospital in Chonburi, Thailand were screened for colistin resistance using automated antimicrobial susceptibility testing and conventional PCR screening...
April 24, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
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