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https://www.readbyqxmd.com/read/29236243/application-potential-of-aerobic-denitrifiers-coupled-with-a-biostimulant-for-nitrogen-removal-from-urban-river-sediment
#1
Yinqi Tang, Meng Li, Danning Xu, Jianjun Huang, Jingmei Sun
Aerobic denitrifiers coupled with a denitrification agent were applied in the sediment of an urban river for the bioremediation of nitrogen pollution. The results revealed that 14.7% of the total nitrogen in the sediment was removed after 115 days of treatment and the nitrate nitrogen concentration removal rate was enhanced in the overlying water. Compared with the control, the total transferable nitrogen in the sediment increased from 0.097 to 0.166 mg/g, indicating that more nitrogen is likely to be involved in the biogeochemical cycling of nitrogen...
December 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29236189/manure-and-mineral-fertilization-change-enzyme-activity-and-bacterial-community-in-millet-rhizosphere-soils
#2
Lixia Xu, Min Yi, Huilan Yi, Erhu Guo, Aiying Zhang
Fertilization is a key agricultural practice for increasing millet yields and influencing soil properties, enzyme activities and rhizosphere bacterial communities. High throughput Illumina sequencing of the 16S rDNA was applied to compare the bacterial community structures and diversities among six different soil samples. The experiments involved the following: no fertilizer (CK), phosphate (P) and potassium (K) plus organic manure (M) (PKM), nitrogen (N) and K plus M (NKM), NPM, NPK and NPKM fertilization...
December 13, 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29232952/ethyl-carbamate-formation-regulated-by-lactic-acid-bacteria-and-nonconventional-yeasts-in-solid-state-fermentation-of-chinese-moutai-flavor-liquor
#3
Hai Du, Zhewei Song, Yan Xu
This study aimed to identify specific microorganisms related to the formation of precursors of ethyl carbamate (EC) in the solid-state fermentation of a Chinese Moutai-flavor liquor. The EC content was significantly correlated with the urea content during the fermentation process (R2 = 0.772, P < 0.01). Differences in urea production and degradation were found between members of the microbiota in the fermentation (at both species and functional gene levels) by metatranscriptomic sequencing and culture-dependent analysis...
December 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29225092/molecular-and-phenotypic-characterization-of-photobacterium-damselae-among-some-marine-fishes-in-lake-temsah
#4
I A M Eissa, H I Derwa, Mona Ismail, Maather El-Lamie, Amina Desuki, Hassnaa Elsheshtawy, Elsayed M Bayoumy
Photobacterium damselae speciese are one of the most devastating bacterial pathogens in mariculture worldwide. Some species of Photobacterium are pathogenic for marine animals and human. They are the causative agents of photobacteriosis, formerly known as pasteurellosis. A total of (202) marine fishes of three different species were represented as: seabass (Dicentrarchus labrax), seabream (Sparus aurata) and gray mullet (Mugil capitus) randomly collected from Lake Temsah at Ismailia governorate along the parallel Pelagic road to the lake in the governorate from August 2015 to July 2016...
December 7, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29212999/-a-case-of-hyperammonemia-resulting-from-urinary-tract-infection-caused-by-urease-producing-bacteria-in-a-parkinson-s-disease-patient-with-drug-induced-urinary-retention
#5
Masahiro Yasunishi, Akihiro Koumura, Yuichi Hayashi, Shohei Nishida, Takashi Inuzuka
A 71-year-old woman with a 9-year history of Parkinson's disease was admitted to our hospital emergently because of consciousness disturbance. Her consciousness level was 200 on the Japan coma scale (JCS), and she presented with tenderness and distension of the lower abdomen. Brain computed tomography showed normal findings. Blood tests showed an increased ammonia level (209 μg/dl) with normal AST and ALT levels. We catheterized the bladder for urinary retention. Five hours after admission, the blood ammonia level decreased to 38 μg/dl, and her consciousness level improved dramatically...
2017: Nihon Ronen Igakkai Zasshi. Japanese Journal of Geriatrics
https://www.readbyqxmd.com/read/29208922/beyond-the-michaelis-menten-equation-accurate-and-efficient-estimation-of-enzyme-kinetic-parameters
#6
Boseung Choi, Grzegorz A Rempala, Jae Kyoung Kim
Examining enzyme kinetics is critical for understanding cellular systems and for using enzymes in industry. The Michaelis-Menten equation has been widely used for over a century to estimate the enzyme kinetic parameters from reaction progress curves of substrates, which is known as the progress curve assay. However, this canonical approach works in limited conditions, such as when there is a large excess of substrate over enzyme. Even when this condition is satisfied, the identifiability of parameters is not always guaranteed, and often not verifiable in practice...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29208276/development-of-novel-ph-sensitive-thiolated-chitosan-pmla-nanoparticles-for-amoxicillin-delivery-to-treat-helicobacter-pylori
#7
Muhammad Arif, Quan-Jiang Dong, Mazhar Ali Raja, Shah Zeenat, Zhe Chi, Chen-Guang Liu
The cysteine conjugated chitosan/PMLA multifunctional nanoparticles were synthesized as targeted Nano-drug delivery system to eradicate Helicobacter pylori. Helicobacter pylori specifically express urea transport protein on its membrane to carrying urea to the cytoplasm urease to supply ammonia that protects bacteria in the acid environment of the stomach. The clinical suitability of topical antimicrobial agents is required to get rid of Helicobacter pylori inside the inflamed basal region. In this work, cysteine conjugated chitosan derivative, Cys-CS for their mucoadhesive and anticoagulant properties was designed and synthesized, for the preparation of multifunctional nanoparticles...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29203664/structural-insights-into-how-gtp-dependent-conformational-changes-in-a-metallochaperone-ureg-facilitate-urease-maturation
#8
Man Hon Yuen, Yu Hang Fong, Yap Shing Nim, Pak Ho Lau, Kam-Bo Wong
The ability of metallochaperones to allosterically regulate the binding/release of metal ions and to switch protein-binding partners along the metal delivery pathway is essential to the metallation of the metalloenzymes. Urease, catalyzing the hydrolysis of urea into ammonia and carbon dioxide, contains two nickel ions bound by a carbamylated lysine in its active site. Delivery of nickel ions for urease maturation is dependent on GTP hydrolysis and is assisted by four urease accessory proteins UreE, UreF, UreG, and UreH(UreD)...
December 4, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29201769/epidemiology-diagnosis-and-risk-factors-of-helicobacter-pylori-infection-in-children
#9
REVIEW
Gokben Ozbey, Alfizah Hanafiah
H. pylori infection is a global public health problem associated with some gastrointestinal diseases in children, especially in developing countries, since prevalence of H. pylori is low in the developed world. Both noninvasive (stool antigen test, urea breath test, and blood test) and invasive (histology, rapid urease test, and microbiological culture) tests have been utilized to detect H. pylori infection. However, a single test is not reliable enough and does not provide accurate enough data to determine H...
January 2017: Euroasian Journal of Hepato-Gastroenterology
https://www.readbyqxmd.com/read/29183662/bisindolylmethane-thiosemicarbazides-as-potential-inhibitors-of-urease-synthesis-and-molecular-modeling-studies
#10
Muhammad Taha, Hayat Ullah, Laode Muhammad Ramadhan Al Muqarrabun, Muhammad Naseem Khan, Fazal Rahim, Norizan Ahmat, Muhammad Tariq Javid, Muhammad Ali, Khalid Mohammed Khan
Bisindolylmethane thiosemicarbazides 1-18 were synthesized, characterized by 1H NMR and ESI MS and evaluated for urease inhibitory potential. All analogs showed outstanding urease inhibitory potentials with IC50 values ranging between 0.14 ± 0.01 to 18.50 ± 0.90 μM when compared with the standard inhibitor thiourea having IC50 value 21.25 ± 0.90 μM. Among the series, analog 9 (0.14 ± 0.01 μM) with di-chloro substitution on phenyl ring was identified as the most potent inhibitor of urease...
November 21, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29182393/analysis-of-the-association-between-density-of-helicobacter-spp-and-gastric-lesions-in-dogs
#11
Marcela Suárez-Esquivel, Alejandro Alfaro-Alarcón, Caterina Guzmán-Verri, Elías Barquero-Calvo
OBJECTIVE To evaluate the correlation between the density of native gastric Helicobacter spp and the presence of gastric lesions in dogs. ANIMALS 80 dogs of various breeds, sexes, and ages. PROCEDURES Gastroscopic and histologic examinations were performed for all dogs. Helicobacter spp were detected by combining evaluation of urease activity and results of bacteriologic culture, microscopic observation, and a 16S rRNA PCR assay. The density of Helicobacter-like organisms was evaluated with light microscopy by use of Warthin-Starry modified stain...
December 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/29181860/detection-of-helicobacter-pylori-in-stool-samples-of-young-children-using-real-time-polymerase-chain-reaction
#12
Gany Beer-Davidson, Musa Hindiyeh, Khitam Muhsen
BACKGROUND: The aims of this study were to develop and validate a multiplex real-time polymerase chain reaction (q-PCR) assay of Helicobacter pylori in stool samples of healthy children. Additionally, we determined the prevalence of clarithromycin resistance and cagA gene in H. pylori-positive samples. MATERIALS AND METHODS: Archived stool samples from 188 children aged 6-9 years and 272 samples of 92 infants aged 2-18 months were tested for H. pylori antigens using enzyme immunoassay (EIA)...
November 27, 2017: Helicobacter
https://www.readbyqxmd.com/read/29175400/revitalisation-of-metal-contaminated-edta-washed-soil-by-addition-of-unpolluted-soil-compost-and-biochar-effects-on-soil-enzyme-activity-microbial-community-composition-and-abundance
#13
Anela Kaurin, Zarja Cernilogar, Domen Lestan
Soil remediation mitigates hazards from contaminants but could deprive soils of initial biota and enzymes. Historically contaminated acidic soil from Arnoldstein (Austria) and calcareous soil from Meza (Slovenia) were washed with 30 and 100 mmol kg-1 ethylenediaminetetraacetate (EDTA) to remove 78 and 60% of Pb as a main pollutant. Remediation of the Arnoldstein soil decreased urease activity and increased β-glucosidase activity, measured in a 15-week experiment. The dehydrogenase activity and microbial gene abundances were not significantly impeded compared to the original soil...
November 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/29174734/rpob-gene-sequencing-highlights-the-prevalence-of-an-e-miricola-cluster-over-other-elizabethkingia-species-among-uk-cystic-fibrosis-patients
#14
Dervla T D Kenna, Alice Fuller, Kate Martin, Claire Perry, Rachel Pike, Phillipa J Burns, Omendra Narayan, Stuart Wilkinson, Robert Hill, Neil Woodford, Julie M J Logan, Jane F Turton
Difficulties in distinguishing species of the Elizabethkingia genus by MALDI-TOF prompted use of rpoB sequencing to investigate species distribution among 44 isolates from cystic fibrosis (CF) patients. Forty-three isolates from 38 patients formed a cluster comprising E. miricola and proposed novel species E. bruuniana sp. nov., the exception clustering with proposed species E. ursingii sp. nov., also part of this wider cluster. All 44 isolates were PCR-positive for urease gene ureG, whereas only one of 23 E...
October 26, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29174355/a-novel-inhibition-based-biosensor-using-urease-nanoconjugate-entrapped-biocomposite-membrane-for-potentiometric-glyphosate-detection
#15
Chetana Vaghela, Mohan Kulkarni, Santosh Haram, Rohini Aiyer, Meena Karve
A potentiometric biosensor based on agarose-guar gum (A-G) entrapped bio-nanoconjugate of urease with gold nanoparticles (AUNps), has been reported for the first time for glyphosate detection. The biosensor is based on inhibition of urease activity by glyphosate, which was measured by direct potentiometry using ammonium ion selective electrode covered with A-G-urease nanoconjugate membrane. TEM and FTIR analysis revealed nanoconjugate formation and its immobilization in A-G matrix respectively. The composite biopolymer employed for immobilization yields thin, transparent, flexible membrane having superior mechanical strength and stability...
November 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29172968/the-sensitivity-of-soil-enzymes-microorganisms-and-spring-wheat-to-soil-contamination-with-carfentrazone-ethyl
#16
Monika Tomkiel, Małgorzata Baćmaga, Agata Borowik, Jadwiga Wyszkowska, Jan Kucharski
Herbicides pose a significant threat to the natural environment, in particular in soils that are most exposed to plant protection agents. Prolonged herbicide use leads to changes in soil metabolism and decreases soil productive potential. In this study, the influence of carfentrazone-ethyl (CE) on the microbiological and biochemical properties of soil and the yield of Triticum aestivum L. was evaluated. Carfentrazone-ethyl was applied to sandy loam (pHKCl - 7.0) in doses of 0.000, 0.264, 5.280, 10.56, 21.18, 42...
November 27, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29168410/response-to-the-letter-to-the-editor-reliability-of-rapid-urease-test-for-screening-gastric-cancer-in-high-risk-populations
#17
Jun-Hyung Cho
No abstract text is available yet for this article.
November 23, 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/29166285/an-evaluation-of-the-usefulness-of-invasive-and-non-invasive-methods-used-to-diagnose-helicobacter-spp-infections-in-dogs
#18
M Jankowski, J Spużak, K Kubiak, K Glińska-Suchocka, M Biernat
The aim of this study was to assess the suitability of invasive and non-invasive methods used to diagnose Helicobacter spp. in the stomachs of dogs. The study was carried out on 30 dogs of both sexes and different breeds, between one and 15 years old. A histopathologic examination, a microbiological culture, a rapid urease test, a direct bacteriological preparation and a nested PCR assay were carried out. Gastric Helicobacter spp. was identified in gastric biopsy specimens from 16 (53.3%) dogs using direct bacteriological preparation, in four (13...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29165844/oral-microbiomes-from-hunter-gatherers-and-traditional-farmers-reveal-shifts-in-commensal-balance-and-pathogen-load-linked-to-diet
#19
Florent Lassalle, Matteo Spagnoletti, Matteo Fumagalli, Liam Shaw, Mark Dyble, Catherine Walker, Mark G Thomas, Andrea Bamberg Migliano, Francois Balloux
Maladaptation to modern diets has been implicated in several chronic disorders. Given the higher prevalence of disease such as dental caries and chronic gum diseases in industrialized societies, we sought to investigate the impact of different subsistence strategies on oral health and physiology, as documented by the oral microbiome. To control for confounding variables such as environment and host genetics, we sampled saliva from three pairs of populations of hunter-gatherers and traditional farmers living in close proximity in the Philippines...
November 22, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29158999/recurrent-primary-suprahepatic-abscess-due-to-providencia-stuartii-a-rare-phenomenon
#20
Kyawzaw Lin, Aung Naing Lin, Sandar Linn, Madhavi Reddy, Anjali Bakshi
Gram-negative urease-producing bacilli, Providencia stuartii (P. stuartii), is reported in urinary tract infections, gastroenteritis, and bacteremia in humans but they rarely present with a hepatic abscess. We present a rare case of a recurrent suprahepatic cyst due to P. stuartii in a 45-year-old female, intravenous ( IV) heroin abuser with chronic hepatitis B and C. A 45-year-old female with 10 days status post right suprahepatic abscess drainage presented with recurrent, right, upper quadrant abdominal pain for one day...
September 16, 2017: Curēus
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