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https://www.readbyqxmd.com/read/29783046/bacterial-community-of-industrial-raw-sausage-packaged-in-modified-atmosphere-throughout-the-shelf-life
#1
Stefano Raimondi, Maria Rosaria Nappi, Tiziana Maria Sirangelo, Alan Leonardi, Alberto Amaretti, Alessandro Ulrici, Rudy Magnani, Chiara Montanari, Giulia Tabanelli, Fausto Gardini, Maddalena Rossi
Ten lots of industrial raw sausages in modified atmosphere (CO2 30%, O2 70%), produced in the same plant over 7 months, were analyzed at the day after production (S samples) and at the end of shelf life (E samples), after 12 days storage at 7 °C to simulate thermal abuse. Quality of the products was generally compromised by storage at 7 °C, with only 3 E samples without alterations. During the shelf life, the pH decreased for the accumulation of acetic and lactic acids. A few biogenic amines accumulated, remaining below acceptable limits...
April 28, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29782978/a-potent-chitinase-from-bacillus-subtilis-for-the-efficient-bioconversion-of-chitin-containing-wastes
#2
Di Wang, Anjie Li, Hongyu Han, Tian Liu, Qing Yang
Bioconversion of chitin-containing waste to N-acetyl-d-glucosamine (GlcNAc) is of economic interest. Highly efficient chitinases are thus desirable. Bacillus subtilis is a well-known microorganism for industrial protein production and biocontrol, however its chitinolytic enzyme has not been studied in detail. In this study, BsChi from B. subtilis was recombinantly expressed in Escherichia coli and characterized as a potent chitinase for degrading crystalline chitin substrates such as α-chitin, β-chitin and crab shells...
May 18, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29781797/from-plants-to-nematodes-serratia-grimesii-bxf1-genome-reveals-an-adaptation-to-the-modulation-of-multi-species-interactions
#3
Francisco Nascimento, Cláudia Vicente, Peter Cock, Maria Tavares, Márcio Rossi, Koichi Hasegawa, Manuel Mota
Serratia grimesii BXF1 is a bacterium with the ability to modulate the development of several eukaryotic hosts. Strain BXF1 was isolated from the pinewood nematode, Bursaphelenchus xylophilus, the causative agent of pine wilt disease affecting pine forests worldwide. This bacterium potentiates Bursaphelenchus xylophilus reproduction, acts as a beneficial pine endophyte, and possesses fungal and bacterial antagonistic activities, further indicating a complex role in a wide range of trophic relationships. In this work, we describe and analyse the genome sequence of strain BXF1, and discuss several important aspects of its ecological role...
May 21, 2018: Microbial Genomics
https://www.readbyqxmd.com/read/29780759/para-substituted-functionalised-ferrocene-esters-with-novel-antibacterial-properties
#4
Kevin Muñoz Forti, Faviola Bernard, Gustavo Santiago-Collazo, Waldemar Garcia, Jose L Vera, Enrique Meléndez, Edu B Suarez-Martinez
Introduction: Bacterial antibiotic resistance is on rise despite advances in the development of new antibiotics. In an attempt to circumvent resistance, scientists are shifting focus from modifying existent antibiotics to identifying new antibiotic compounds. Aim: To assess the potential antibiotic effects of functionalised ferrocenecarboxylates para-substituted on the phenoxy pendant group to form: 4-fluorophenyl, 4-chlorophenyl, 4-bromophenyl, 4-iodophenyl and 4-(H-pyrrol-1-yl)phenyl...
February 2018: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29778048/pathogens-constancy-harbinger-of-nosocomial-infection-cum-identification-of-resistant-genes-and-drug-designing
#5
Sana Farooq Ahmad, Ibrar Khan, Abdul Wadood, Sadiq Azam, Noor Rehman, Muhammad Waqas, Kashif Bashir, Asaf Ali Khan
Hospitals are the most prominent places for the growth and spread of bacteria which are resistant to the available antibiotics. This antibiotic resistance is due to the over and misuse of antibiotic dosages of a high-density of patient population which are in frequent interaction with inanimate items of the hospitals and the consequent risk of cross infection. Out of 1010 samples of the current study, 510 (50.49%) were culture positive of which 329 (64.5%) were Gram-positive while 181 (35.49%) Gram negative...
April 22, 2018: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/29765908/the-subgingival-microbiome-of-periodontal-pockets-with-different-probing-depths-in-chronic-and-aggressive-periodontitis-a-pilot-study
#6
Meng Shi, Yiping Wei, Wenjie Hu, Yong Nie, Xiaolei Wu, Ruifang Lu
Periodontitis is a kind of infectious disease initiated by colonization of subgingival periodontal pathogens, which cause destruction of tooth-supporting tissues, and is a predominant threat to oral health as the most common cause of loss of teeth. The aim of this pilot study was to characterize the subgingival bacterial biodiversity of periodontal pockets with different probing depths in patients with different forms of periodontitis. Twenty-one subgingival plaque samples were collected from three patients with chronic periodontitis (ChP), three patients with aggressive periodontitis (AgP) and three periodontally healthy subjects (PH)...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29765368/killing-effects-of-an-isolated-serratia-marcescens-kh-001-on-diaphorina-citri-via-lowering-the-endosymbiont-numbers
#7
Wei Hu, Fan Kuang, Zhanjun Lu, Ning Zhang, Tingtao Chen
Huanglongbing (HLB) is the most devastating citrus disease worldwide, and suppression of the Asian citrus psyllid ( Diaphorina citri ) is regarded as an effective method to inhibit the spread of HLB. In this study, we isolated a strain named as Serratia marcescens KH-001 from D. citri nymphs suffering from disease, and evaluated its killing effect on D. citri via toxicity test and effect on microbial community in D. citri using high-throughput sequencing. Our results indicated that S. marcescens KH-001 could effectively kill 83% of D...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29764667/bacterial-pathogens-of-bees
#8
REVIEW
Anne Fünfhaus, Julia Ebeling, Elke Genersch
Pollination is an indispensable ecosystem service provided by many insects, especially by wild and managed bee species. Hence, reports on large scale honey bee colony losses and on population declines of many wild bees were alarming and resulted in increased awareness of the importance of bee health and increased interest in bee pathogens. To serve this interest, this review will give a comprehensive overview on bacterial bee pathogens by covering not only the famous pathogens (Paenibacillus larvae, Melissococcus plutonius), but also the orphan pathogens which have largely been neglected by the scientific community so far (spiroplasmas) and the pathogens which were only recently discovered as being pathogenic to bees (Serratia marcescens, Lysinibacillus sphaericus)...
April 2018: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/29762699/cultivable-bacteria-from-pectinatella-magnifica-and-the-surrounding-water-in-south-bohemia-indicate-potential-new-gammaproteobacterial-betaproteobacterial-and-firmicutes-taxa
#9
Hana Salmonová, Jirí Killer, Vera Bunešová, Martina Geigerová, Eva Vlková
Pectinatella magnifica is a freshwater bryozoan, which has become a subject of scientific interest because of its invasive expansion worldwide. To obtain a comprehensive overview of its influence on environments, information on associated bacteria is needed. In this study, cultivable bacteria associated with P. magnifica were investigated. In total, 253 isolates were selected for preliminary identification by MALDI-TOF mass spectrometry and clustered based on REP-PCR profiles. Among these, 169 strains were selected and identified using 16S rRNA gene comparative analyses...
May 14, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29753873/biodiversity-and-pathogenicity-of-bacteria-associated-with-the-gut-microbiota-of-beet-armyworm-spodoptera-exigua-h%C3%A3-bner-lepidoptera-noctuidae
#10
Ardahan Eski, İsmail Demir, Mustafa Güllü, Zihni Demirbağ
In order to find an effective and environmentally friendly biocontrol agent against Spodoptera exigua, we isolated and identified a total of 15 different bacterial species belonging to phyla Firmicutes, Proteobacteria and Bacteroidetes. According to the phenotypic, genotypic and phylogenetic properties, bacterial isolates were identified as Bacillus cereus (Se1), Lysinibacillus macroides (Se2), Pseudomonas geniculata (Se3), Paenibacillus tylopili (Se4), Staphylococcus succinus (Se5), Acinetobacter soli (Se6), Chryseobacterium indologenes (Se7), Bacillus toyonensis (Se8), Serratia marcescens (Se9), Paenibacillus amylolyticus (Se10), Paenibacillus xylanexedens (Se11), Enterobacter ludwigii (Se12), Bacillus thuringiensis (Se13), Bacillus thuringiensis (Se14) and Lysinibacillus fusiformis (Se15)...
May 10, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29752518/diversity-of-the-aromatic-ring-hydroxylating-dioxygenases-in-the-monoaromatic-hydrocarbon-degraders-held-by-a-common-ancestor
#11
Alper Yavas, Bulent Icgen
Aromatic ring hydroxylating dioxygenases (ARHDs), harboured by a variety of bacteria, catalyze the initial reaction in the degradation of a wide range of toxic environmental contaminants like aromatic and polycyclic aromatic hydrocarbons (PAHs). Regardless of the source, bacteria harbouring RHDs play major role in the removal of these toxic contaminants. The diversity of ARHDs in contaminated sites is supposed to be huge. However, most of the ARHD diversity studies are based on the PAH degraders and the ARHD diversity in the monoaromatic hydrocarbon degraders has not fully explored yet...
May 11, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29749026/molecular-identification-of-cultivable-bacteria-in-the-gut-of-adult-bactrocera-tau-walker-and-their-trapping-effect
#12
Mijuan Luo, Hehe Zhang, Yinggang Du, Atif Idrees, Longyan He, Jiahua Chen, Qing E Ji
BACKGROUND: It has been shown that some bacteria can attract their hosts. Our research aimed to identify cultivable bacterial isolates in the guts of sexually mature adult female and male Bactrocera tau and to evaluate their utility in trapping of B. tau. RESULTS: Forty-one strains of bacteria were isolated and identified from B. tau with morphological, physiological, biochemical and 16S rDNA analysis. The dominant bacterial genera shared by both females and males were Enterobacter, Providencia and Serratia...
May 11, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29747496/diversity-of-bacterial-community-during-ensiling-and-subsequent-exposure-to-air-in-whole-plant-maize-silage
#13
Zongfu Hu, Jie Chang, Jianhua Yu, Shuguo Li, Huaxin Niu
Objective: To describe in-depth sequencing, the bacterial community diversity and its succession during ensiling of whole-plant maize and subsequent exposure to air. Methods: The microbial community dynamics of fermented whole-plant maize during 60 days (sampled on day 5, 10, 20, 40, 60) and subsequent aerobic exposure (sampled on day 63 after exposure to air for 3 days) were explored using Illumina Miseq sequence platform. Results: A total of 227, 220 effective reads were obtained...
April 25, 2018: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/29746674/considerations-in-the-diagnosis-of-chronic-granulomatous-disease
#14
Joyce E Yu, Antoine E Azar, Hey J Chong, Artemio M Jongco, Benjamin T Prince
Chronic granulomatous disease (CGD) is a rare primary immunodeficiency that is caused by defects in the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase complex. The disease presents in most patients initially with infection, especially of the lymph nodes, lung, liver, bone, and skin. Patients with CGD are susceptible to a narrow spectrum of pathogens, and Staphylococcus aureus, Burkholderia cepacia complex, Serratia marcescens, Nocardia species, and Aspergillus species are the most common organisms implicated in North America...
May 9, 2018: Journal of the Pediatric Infectious Diseases Society
https://www.readbyqxmd.com/read/29744557/molecular-insights-into-the-activity-and-mechanism-of-cyanide-hydratase-enzyme-associated-with-cyanide-biodegradation-by-serratia-marcescens
#15
Madhulika Kushwaha, Virender Kumar, Rishi Mahajan, Tek Chand Bhalla, Subhankar Chatterjee, Yusuf Akhter
The present study provides molecular insights into the activity and mechanism of cyanide hydratase enzyme associated with degradation of cyanide compounds, using Serratia marcescens RL2b as a model organism. Resting cells harvested after 20 h achieved complete degradation of 12 mmol l- 1 cyanide in approximately 10 h. High-performance liquid chromatography analysis of reaction samples revealed formation of formamide as the only end product, which confirmed the presence of cyanide hydratase activity in S...
May 9, 2018: Archives of Microbiology
https://www.readbyqxmd.com/read/29733926/improving-the-thermostability-of-serratia-marcescens-b4a-chitinase-via-g191v-site-directed-mutagenesis
#16
Zeinab Emruzi, Saeed Aminzadeh, Ali Asghar Karkhane, Jahan Alikhajeh, Kamahldin Haghbeen, Dariush Gholami
Chitinases with high thermostability are important for many industrial and biotechnological applications. This study was conducted to enhance the stability of Serratia marcescens B4A chitinase by site directed mutagenesis of G191 V. Further characterization showed that the thermal stability of the mutant showed marked increase of about 5 and 15 fold at 50 and 60 °C respectively, while the optimum temperature and pH was retained. Kinetic analysis showed decreased Km and Vmax of the mutant in comparison with the wild type chitinase of about 1...
May 4, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29728854/improved-l-ornithine-production-in-corynebacterium-crenatum-by-introducing-an-artificial-linear-transacetylation-pathway
#17
Qunfeng Shu, Meijuan Xu, Jing Li, Taowei Yang, Xian Zhang, Zhenghong Xu, Zhiming Rao
L-Ornithine is a non-protein amino acid with extensive applications in the food and pharmaceutical industries. In this study, we performed metabolic pathway engineering of an L-arginine hyper-producing strain of Corynebacterium crenatum for L-ornithine production. First, we amplified the L-ornithine biosynthetic pathway flux by blocking the competing branch of the pathway. To enhance L-ornithine synthesis, we performed site-directed mutagenesis of the ornithine-binding sites to solve the problem of L-ornithine feedback inhibition for ornithine acetyltransferase...
May 4, 2018: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29718423/efflux-pump-inhibitor-cccp-to-rescue-colistin-susceptibility-in-mcr-1-plasmid-mediated-colistin-resistant-strains-and-gram-negative-bacteria
#18
Sophie A Baron, Jean-Marc Rolain
Objectives: Efflux in bacteria is a ubiquitous mechanism associated with resistance to antimicrobials agents. Efflux pump inhibitors (EPIs) have been developed to inhibit efflux mechanisms and could be a good alternative to reverse colistin resistance, but only CCCP has shown good activity. The aim of our study was to identify CCCP activity in a collection of 93 Gram-negative bacteria with known and unknown colistin resistance mechanisms including isolates with mcr-1 plasmid-mediated colistin resistance...
April 26, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29709985/the-use-of-electric-toilet-seats-with-water-spray-is-efficacious-in-maintaining-hand-hygiene-in-experimental-model
#19
Shigeharu Oie, Hiromi Aoshika, Emiko Arita, Akira Kamiya
A simulatory experiment was conducted to examine the hand contamination from wiping the buttocks after using or not using an electric toilet seat with water spray. A model of the buttocks was smeared with diarrheal feces artificially made containing Serratia marcescens, and wiped by the participants wearing plastic gloves with 4 sheets of toilet paper using the water spray of electric seat or not. Subsequently, the presence of S. marcescens on the surfaces of the gloves were quantitated. The mean count ± standard deviation of S...
April 27, 2018: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29708771/serratia-marcescens-colonization-causing-pink-breast-milk-and-pink-diapers-a-case-report-and-literature-review
#20
Laura Quinn, Melody Ailsworth, Elizabeth Matthews, Ann Kellams, Debbie-Ann Shirley
INTRODUCTION: Serratia marcescens is an opportunistic pathogen and common cause of infectious outbreaks in pediatric units, leading to both significant morbidity and mortality in immunocompromised hosts. Environmental and some clinical strains may produce a characteristic red pigment, prodigiosin. Colonization can hence turn breast milk and fecally-soiled diapers pink, which can lead otherwise unaffected patients to present to their physicians and also interrupt breastfeeding. No clear guidance exists regarding the outpatient management of breastfeeding mothers and infants colonized with S...
April 30, 2018: Breastfeeding Medicine: the Official Journal of the Academy of Breastfeeding Medicine
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