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Low ph tolerance

Magdalena Michalak, Klaudia Gustaw, Adam Waśko, Magdalena Polak-Berecka
The present work is the first report on spontaneous fermentation of curly kale and characteristics of autochthonous lactic acid bacteria (LAB). Our results indicate that curly kale fermentation is the new possibility of the technological use of this vegetable. Bacteria representing ten different species were isolated from three phases of curly kale fermentation and identified by MALDI-TOF mass spectrometry and 16S rRNA gene sequencing. Among them, four species were identified as Lactobacillus spp. (Lb. plantarum 332, Lb...
January 2018: Microbiological Research
Sakiko Yoshida, Teruki Miyake, Shin Yamamoto, Shinya Furukawa, Tetsuji Niiya, Hidenori Senba, Sayaka Kanzaki, Osamu Yoshida, Toru Ishihara, Mitsuhito Koizumi, Masashi Hirooka, Teru Kumagi, Masanori Abe, Kohichiro Kitai, Bunzo Matsuura, Yoichi Hiasa
AIMS/INTRODUCTION: The association between urine pH and abnormal glucose tolerance in men and women is unclear; therefore, we conducted a community-based, cross-sectional study to investigate sex-specific associations between these values, possible indicators of prediabetes, and type 2 diabetes. MATERIALS AND METHODS: We enrolled 4,945 Japanese subjects (2,490 men and 2,455 women), who had undergone annual health checkups. To investigate the relationship between low urine pH and abnormal glucose tolerance, subjects were divided into three groups based on their fasting plasma glucose levels (<6...
November 16, 2017: Journal of Diabetes Investigation
Roohi, Mohammed Kuddus
Microbacterium foliorum GA2, an alkali-tolerant bacterium, was randomly mutated using UV radiation and sodium azide to obtain a mutant with a higher cold-active extracellular amylolytic activity. A mutant, designated as MFSD20, was selected owing to its higher amylase activity at 20°C. Under optimized conditions, amylase production was achieved best with raw banana peels (5000 units) in solid-state fermentation (SSF). The enzyme was purified by salt precipitation and chromatographic methods and afterwards characterized biochemically...
November 15, 2017: Journal of General and Applied Microbiology
Mohammad Asif Shah, Saroj Mishra, Tapan Kumar Chaudhuri
Protein folding is an extremely complex and fast, yet perfectly defined process, involving interplay of many intra and inter-molecular forces. In vitro, these molecular interactions are reversible for many proteins e.g., smaller and monomeric, organized into single domains. However, refolding of larger multi-domain/multimeric proteins is much more complicated, proceeds in a hierarchal way and is often irreversible. In a comparative study on two large, multi-domain and multimeric isozymes, β -glucosidase I (BGLI) and β-glucosidase II (BGLII) from Pichia etchellsii, we studied spontaneous and assisted refolding under three denaturing conditions viz...
November 12, 2017: International Journal of Biological Macromolecules
Kirsten Rl Bond, Carl Ae Horsley, Anthony B Williams
OBJECTIVE: To describe the use of non-invasive ventilation (NIV) in adults presenting with status asthmaticus to Middlemore Hospital Critical Care Complex (CCC, South Auckland, New Zealand) from 2000 to 2015. METHOD: Retrospective review of all adult asthma admissions to the Hospital CCC between 2000 and 2015. Demographic, physiological, treatment data and blood gas results were recorded. RESULTS: There were 265 asthma admissions to Middlemore Hospital CCC during the study period...
November 12, 2017: Emergency Medicine Australasia: EMA
Linas Venclauskas, Almantas Maleckas, Juan I Arcelus
: A systematic literature search was performed and patients were selected as obese patients undergoing bariatric surgery or obese patients undergoing nonbariatric surgical procedures. In addition, patients were stratified according to low risk of venous thromboembolism and high risk of venous thromboembolism (age >55 years, BMI >55 kg m, history of venous thromboembolism, venous disease, sleep apnoea, hypercoagulability or pulmonary hypertension). Prophylaxis of venous thromboembolism was analysed depending on the type of modality: compression devices of the lower extremities (including intermittent pneumatic compression and graduated compression stockings), pharmacological prophylaxis or inferior vena cava filters...
November 6, 2017: European Journal of Anaesthesiology
Malihe Masomian, Azmiza Syawani Jasni, Raja Noor Zaliha Raja Abd Rahman, Abu Bakar Salleh, Mahiran Basri
A total of 97 amino acids, considered as the signal peptide and transmembrane segments were removed from 205y lipase gene using polymerase chain reaction technique that abolished the low activity of this enzyme. The mature enzyme was expressed in Escherichia coli using pBAD expression vector, which gave up to a 13-fold increase in lipase activity. The mature 205y lipase (without signal peptide and transmembrane; -SP/TM) was purified to homogeneity using the isoelectric focusing technique with 53% recovery. Removing of the signal peptide and transmembrane segments had resulted in the shift of optimal pH, an increase in optimal temperature and tolerance towards more water-miscible organic solvents as compared to the characteristics of open reading frame (ORF) of 205y lipase...
October 28, 2017: Journal of Biotechnology
Christine A Kressirer, Daniel J Smith, William F King, Justine M Dobeck, Jacqueline R Starr, Anne C R Tanner
Background: Streptococcus mutans has been strongly associated with dental caries but caries also occurs in its absence. Association of a new species, Scardovia wiggsiae with childhood caries suggests this could be a new caries pathogen. Highlight: S. mutans is considered a caries pathogen based on its association with caries, and on its ability to produce acid, to survive low pH environments, and to induce caries in experimental animals. S. wiggsiae was significantly associated with severe-early childhood caries in the presence and absence of S...
August 2017: Journal of Oral Biosciences
Kun Wang, Xuemei Nan, Puyi Zhao, Wei Liu, James Drackley, Shijie Liu, Kaizhan Zhang, Dengpan Bu
Objective: The objective of the present study was to determine ammonium chloride tolerance of lactating dairy cows, by examining effects of negative DCAD induced by ruminal ammonium chloride infusion on performance, serum and urine minerals, serum metabolites and enzymes of lactating dairy cows. Methods: Four primiparous lactating Chinese Holstein cows fitted with ruminal cannulas were infused with increasing amounts (0, 150, 300, or 450 g/d) of ammonium chloride in a crossover design...
November 3, 2017: Asian-Australasian Journal of Animal Sciences
Günter Gauglitz, Benedikt Wimmer, Tanja Melzer, Carolin Huhn
Since its introduction in 1974, the herbicide glyphosate has experienced a tremendous increase in use, with about one million tons used annually today. This review focuses on sensors and electromigration separation techniques as alternatives to chromatographic methods for the analysis of glyphosate and its metabolite aminomethyl phosphonic acid. Even with the large number of studies published, glyphosate analysis remains challenging. With its polar and depending on pH even ionic functional groups lacking a chromophore, it is difficult to analyze with chromatographic techniques...
November 2, 2017: Analytical and Bioanalytical Chemistry
Sanjay Divakaran, Joseph Loscalzo
The use of nitroglycerin in the treatment of angina pectoris began not long after its original synthesis in 1847. Since then, the discovery of nitric oxide as a biological effector and better understanding of its roles in vasodilation, cell permeability, platelet function, inflammation, and other vascular processes have advanced our knowledge of the hemodynamic (mostly mediated through vasodilation of capacitance and conductance arteries) and nonhemodynamic effects of organic nitrate therapy, via both nitric oxide-dependent and -independent mechanisms...
November 7, 2017: Journal of the American College of Cardiology
Daojin Li, Zijun Bie
Boronate affinity materials, as efficient sorbents for extraction, separation and enrichment of glycoproteins, have attracted more and more attention in recent years. However, conventional boronate affinity materials suffer from low binding affinity due to the use of single boronic acids, which makes the extraction of glycoproteins in trace concentration rather difficult or impossible. Here we present a type of high boronate avidity material, polyethyleneimine (PEI)-assisted boronic acid-functionalized magnetic nanoparticles (MNPs)...
November 2, 2017: Analyst
Ruiling Gao, Zifu Li, Xiaoqin Zhou, Shikun Cheng, Lei Zheng
Background: The sustainability of microbial lipids production from traditional carbon sources, such as glucose or glycerol, is problematic given the high price of raw materials. Considerable efforts have been directed to minimize the cost and find new alternative carbon sources. Volatile fatty acids (VFAs) are especially attractive raw materials, because they can be produced from a variety of organic wastes fermentation. Therefore, the use of volatile fatty acids as carbon sources seems to be a feasible strategy for cost-effective microbial lipid production...
2017: Biotechnology for Biofuels
Mya M Hlaing, Bayden R Wood, Don McNaughton, Julian I Rood, Edward M Fox, Mary Ann Augustin
The ability of bacteria to tolerate acid stress plays an important role in their growth and survival. In particular, aciduric bacteria have several survival systems that prevent cell damage from acid stress. In this study, the effect of the bacterial stress induced by pre-adaptation at different pH values on the cellular macromolecules of Lactobacillus plantarum was investigated using Raman spectroscopy and Fourier transform infrared spectroscopy. The expression of key genes was also quantified to provide understanding of the transcriptional response of the cells to lethal acid stress conditions...
October 29, 2017: Applied Microbiology and Biotechnology
Xingqun Cheng, Sylvio Redanz, Nyssa Cullin, Xuedong Zhou, Xin Xu, Vrushali Joshi, Dipankar Koley, Justin Merritt, Jens Kreth
Commensal Streptococcus sanguinis and Streptococcus gordonii are pioneer oral biofilm colonizers. Characteristic for both is the SpxB-dependent production of H2O2, which is crucial for inhibiting competing biofilm members, especially the cariogenic species Streptococcus mutans H2O2 production is strongly impacted by environmental conditions, yet few mechanisms are known. Dental plaque pH is one of the key parameters dictating dental plaque ecology, and ultimately oral health status. Therefore, the objective of the current study was to characterize the effect of environmental pH upon H2O2 production by S...
October 27, 2017: Applied and Environmental Microbiology
Li-Chun Wu, Teh-Hua Tsai, Man-Hai Liu, Jui-Ling Kuo, Yung-Chu Chang, Ying-Chien Chung
The extensive use of Cr(VI) in many industries and the disposal of Cr(VI)-containing wastes have resulted in Cr(VI)-induced environmental contamination. Cr(VI) compounds are associated with increased cancer risks; hence, the detection of toxic Cr(VI) compounds is crucial. Various methods have been developed for Cr(VI) measurement, but they are often conducted offsite and cannot provide real-time toxicity monitoring. A microbial fuel cell (MFC) is an eco-friendly and self-sustaining device that has great potential as a biosensor for in situ Cr(VI) measurement, especially for wastewater generated from different electroplating units...
October 27, 2017: Sensors
M F Shuhadha, G J Panagoda, T Madhujith, N W Jayawardana
Introduction: Curd is a potential source of probiotic Lactobacillus species. Methods: This study was carried out to isolate and characterise Lactobacillus species available in curd samples sold in the market. Nine curd samples prepared using cow or buffalo milk were obtained from a local market in the Kandy district. Results: Seven isolates (LB 1-7) were identified based on their colony morphology and biochemical characteristics and evaluated for probiotic attributes such as low pH tolerance, resistance to bile salts, antimicrobial activity against Escherichia coli and Pseudomonas aeruginosa, antibiotic activity against erythromycin, chloramphenicol and norfloxacin, haemolytic activity and DNase activity...
September 30, 2017: Ceylon Medical Journal
Krishan Kumar, John Chen, Karl Drlica, Bo Shopsin
The agr system of Staphylococcus aureus promotes invasion of host tissues, and as expected, agents that block agr quorum sensing have anti-infective properties. Paradoxically, agr-defective mutants are frequently recovered from patients, especially those persistently infected with S. aureus We found that an agr deficiency increased survival of cultured bacteria during severe stress, such as treatment with gentamicin, ciprofloxacin, heat, or low pH. With daptomycin, deletion of agr decreased survival. Therefore, agr activity can be either detrimental or protective, depending on the type of lethal stress...
October 24, 2017: MBio
Julien Chaillot, Faiza Tebbji, Carlos García, Hugo Wurtele, René Pelletier, Adnane Sellam
Current antifungal drugs suffer from limitations including toxicity, the emergence of resistance and decreased efficacy at low pH that are typical of human vaginal surfaces. Here, we have shown that the antipsychotic drug valproic acid (VPA) exhibited a strong antifungal activity against both sensitive and resistant Candida albicans in pH condition similar to that encountered in vagina. VPA exerted a strong anti-biofilm activity and attenuated damage of vaginal epithelial cells caused by C. albicans. We also showed that VPA synergizes with the allylamine antifungal, Terbinafine...
2017: Frontiers in Microbiology
Jana Zemančíková, Marie Kodedová, Klára Papoušková, Hana Sychrová
Saccharomyces species, which are mostly used in the food and beverage industries, are known to differ in their fermentation efficiency and tolerance of adverse fermentation conditions. However, the basis of their difference has not been fully elucidated, although their genomes have been sequenced and analyzed. Five strains of four Saccharomyces species (S. cerevisiae, S. kudriavzevii, S. bayanus, and S. paradoxus), when grown in parallel in laboratory conditions, exhibit very similar basic physiological parameters such as membrane potential, intracellular pH, and the degree to which they are able to quickly activate their Pma1 H(+)-ATPase upon glucose addition...
October 20, 2017: Folia Microbiologica
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