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https://www.readbyqxmd.com/read/29334461/enhanced-proton-loss-from-neutral-free-radicals-towards-carbon-centered-superacids
#1
John C Walton
Radical centers close to protons are known to enhance their dissociation. Investigation of the generality of this Radical Enhanced Deprotonation (RED-shift) phenomenon and the kinds of structures in which it operates are reported. The pKas for sulfinic, sulfonic, pentan-2,4-dione and Meldrum's acid species, with adjacent radicals centered on C-, N- and O-atoms, were computed by a DFT method from free energies of deprotonation. All series showed significant RED-shifts that increased with the electronegativity of the radical center...
January 15, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29334238/chemical-constituents-from-the-flowers-of-satsuma-mandarin-and-their-free-radical-scavenging-and-%C3%AE-glucosidase-inhibitory-activities
#2
Anjana Adhikari-Devkota, Sara Mustafa Idris Elbashir, Takashi Watanabe, Hari Prasad Devkota
Flowers of Citrus plants are used as mild sedatives and for the treatment of insomnia in traditional medicines. In Japan, tea made from the flowers of Satsuma mandarin is consumed as healthy drink. Hesperidin (1), hesperetin (2), rutin (3), quercetin (4), nicotiflorin (5), eriocitrin (6), narirutin (7), phenylethyl glucoside (8) and unshuoside A (9) were isolated from the MeOH extract of fresh flowers. Structure elucidation of these compounds was performed on the basis of NMR spectroscopic data. Among them, rutin (3), quercetin (4) and eriocitrin (6) showed potent free radical scavenging activity, whereas hesperetin (2) and quercetin (4) showed potent α-glucosidase inhibitory activity...
January 15, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29334093/three-component-difluoroalkylation-and-trifluoromethylthiolation-trifluoromethylselenolation-of-%C3%AF-bonds
#3
Bo-Sheng Zhang, Lu-Yao Gao, Zhe Zhang, Yu-Hua Wen, Yong-Min Liang
This report describes a new method for three-component difluoroalkylation and trifluoromethylthiolation/trifluoromethylselenolation of π-bonds via air-stable SCF3 and SeCF3 reagents as free-radical initiators of ethyl iododifluoroacetate. β-Proton elimination can be overcome effectively in this reaction system, and a broad substrate scope, including alkenes and alkynes, makes this approach practical and attractive.
January 15, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29333608/the-synergistic-effect-of-pdt-and-oxacillin-on-clinical-isolates-of-staphylococcus-aureus
#4
Natanel Iluz, Yasmin Maor, Natan Keller, Zvi Malik
BACKGROUND: Staphylococcus aureus is a major pathogen in clinical microbiology. It is known to cause infections at various body sites and can be life-threatening. The development of resistance to many well-established antibiotic treatments and the prevalence of methicillin-resistant S. aureus (MRAS) among hospital patients and the general community pose challenges in treating the pathogen. The antimicrobial effect of photodynamic therapy (PDT) has been a subject of study for a long time and can offer new strategies for dealing with resistant strains...
January 15, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29333388/enhancement-of-phenolic-production-and-antioxidant-activity-from-buckwheat-leaves-by-subcritical-water-extraction
#5
Dong-Shin Kim, Mi-Bo Kim, Sang-Bin Lim
To enhance the production of phenolic compounds with high antioxidant activity and reduce the level of phototoxic fagopyrin, buckwheat leaves were extracted with subcritical water (SW) at 100~220°C for 10~50 min. The major phenolic compounds were quercetin, gallic acid, and protocatechuic acid. The cumulative amount of individual phenolic compounds increased with increasing extraction temperature from 100°C to 180°C and did not change significantly at 200°C and 220°C. The highest yield of individual phenolic compounds was 1,632...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333387/physicochemical-and-antioxidant-properties-of-honeys-from-the-sundarbans-mangrove-forest-of-bangladesh
#6
M Rabiul Islam, Tahmina Pervin, Hemayet Hossain, Badhan Saha, Sheikh Julfikar Hossain
This study evaluated the physicochemical, nutritional, antioxidant, and phenolic properties of ten honey samples from the Sundarbans mangrove forest, Bangladesh. The average pH, electrical conductivity, total dissolved solid, ash, moisture, hydroxymethyl furfural, titrable acidity, and absorbance were 4.3, 0.38 mS/cm, 187.5 ppm, 0.14%, 17.88%, 4.4 mg/kg, 37.7 meq/kg, and 483 mAU, respectively. In the honeys, the average contents of Ca, Cu, Fe, K, Mg, Mn, and Na were 95.5, 0.19, 6.4, 302, 39.9, 3.4, and 597 ppm, respectively, whereas Cd, Cr, Pb, and Ni were not found...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333051/therapeutic-significance-of-loligo-vulgaris-lamarck-1798-ink-extract-a-biomedical-approach
#7
Sri Kumaran Nadarajah, Radha Vijayaraj, Jayaprakashvel Mani
Background: The squid ink extract is well known for its biomedical properties. Objective: In this study, squid Loligo vulgaris was collected from Tuticorin costal water, Bay of Bengal, India. Materials and Methods: Proximate composition of the crude squid ink was studied and found to have protein as the major component over lipid and carbohydrates. Further, bioactive fractions of squid ink were extracted with ethanol, and therapeutic applications such as hemolytic, antioxidant, antimicrobial, and in vitro anti-inflammatory properties were analyzed using standard methods...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29333048/astaxanthin-ameliorates-hepatic-damage-and-oxidative-stress-in-carbon-tetrachloride-administered-rats
#8
Md Ariful Islam, Md Abdullah Al Mamun, Md Faruk, Md Tauhid Ul Islam, Md Mizanur Rahman, Mohammad Nazmul Alam, A F M Towheedur Rahman, Hasan Mahmud Reza, Md Ashraful Alam
Background: Astaxanthin is of carotenoids group which possess strong antioxidant properties. The present study was conducted to evaluate the hepatoprotective effects of astaxanthin in carbon tetrachloride (CCl4)-treated rats. Materials and Methods: Female Long-Evans rats were administered with CCl4 orally (1 ml/kg) twice a week for 2 weeks and were treated with astaxanthin (10 mg/kg) every day for 2 weeks. Blood plasma samples were isolated from each group and were analyzed for alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase activities...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29332602/nanoemulsion-strategy-for-ursolic-and-oleanic-acids-isolates-from-plumeria-obtusa-improves-antioxidant-and-cytotoxic-activity-in-melanoma-cells
#9
Helen L Alvarado, Ana C Calpena, Maria L Garduno-Ramirez, Raul Ortiz, Consolacion Melguizo, Jose M Prados, Beatriz Clares
BACKGROUND: Triterpenoids are an important class of natural bioactive products present in many medicinal plants. OBJECTIVE: The aim of present study is to investigate the antioxidant and anticarcinogenic potential of oleanolic acid (OA) and ursolic acid (UA) on B16 murine melanoma cell line isolated from Plumeria obtusa, free and loaded in a nanoemulsion (NEm) system. METHOD: The nanoemulsion was characterized by dynamic light scattering, transmission electron microscopy...
January 11, 2018: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/29331816/new-robust-sensitive-fluorescence-spectroscopy-coupled-with-plsr-for-estimation-of-quercetin-in-ziziphus-mucronata-and-ziziphus-sativa
#10
Javid Hussain, Fazal Mabood, Ahmed Al-Harrasi, Liaqat Ali, Tania Shamim Rizvi, Farah Jabeen, Syed Abdullah Gilani, Shehla Shinwari, Mushtaq Ahmad, Zahra Khalfan Alabri, Said Hamood Salim Al Ghawi
Flavonoids are natural antioxidants derived from plants and commonly found in a variety of foods to sequester free radicals. Quercetin, belonging to flavonol subclass of flavonoids, has received considerable attention because of its wide uses as a nutritional supplement as well as a phytochemical remedy for a number of diseases. In the current study, quantification of quercetin was carried out in two medicinally important flavonoid rich plant Ziziphus mucronata and Ziziphus sativa. Emission spectroscopy was utilized as a new method coupled with Partial Least Squares Regression (PLSR) and the cross validation was done by UV-Visible spectroscopy...
January 6, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29331568/overall-survival-and-oncological-outcomes-after-partial-nephrectomy-and-radical-nephrectomy-for-ct2a-renal-tumors-a-collaborative-international-study-from-the-french-kidney-cancer-research-network-uroccr
#11
B Reix, J-C Bernhard, J-J Patard, P Bigot, A Villers, E Suer, N S Vuong, G Verhoest, Q Alimi, J-B Beauval, T Benoit, F-X Nouhaud, C Lenormand, N Hamidi, J Cai, M Eto, S Larre, A El Bakhri, G Ploussard, A Hung, N Koutlidis, A Schneider, J Carrouget, S Droupy, S Marchal, A Doerfler, S Seddik, T Matsugasumi, X Orsoni, A Descazeaud, C Pfister, K Bensalah, M Soulie, I Gill, V Flamand
BACKGROUND: Partial nephrectomy (PN) is recommended as first-line treatment for cT1 stage kidney tumors because of a better renal function and probably a better overall survival than radical nephrectomy (RN). For larger tumors, PN has a controversial position due to lack of evidence showing good cancer control. The aim of this study was to compare the results of PN and RN in cT2a stage on overall survival and oncological results. METHOD: A retrospective international multicenter study was conducted in the frame of the French kidney cancer research network (UroCCR)...
January 10, 2018: Progrès en Urologie
https://www.readbyqxmd.com/read/29329898/-prognostic-of-older-age-for-patients-with-invasive-muscle-bladder-cancer-and-treated-by-radical-cystectomy
#12
Y Dehayni, M Tetou, Y Khdach, A Janane, M Alami, A Ameur
INTRODUCTION: Bladder tumor is a disease of older persons, but can also occur in young adults, because certainly an influence of environmental factors and a change of lifestyle. The aim of our retrospective analysis is to assess and evaluate the extent of the prognostic impact of age on the carcinological prognosis of invasive-muscle-bladder cancer treated by total cystotomy. METHODS: To evaluate the association of patient age with pathological characteristics and recurrence-free and disease survival, we retrospectively reviewed 345 patients with invasive bladder cancer between January 2000 and January 2015...
January 9, 2018: Progrès en Urologie
https://www.readbyqxmd.com/read/29329239/fine-regulation-of-neutrophil-oxidative-status-and-apoptosis-by-ceruloplasmin-and-its-derivatives
#13
Ekaterina A Golenkina, Galina M Viryasova, Svetlana I Galkina, Tatjana V Gaponova, Galina F Sud'ina, Alexey V Sokolov
Timely neutrophil apoptosis is an essential part of the resolution phase of acute inflammation. Ceruloplasmin, an acute-phase protein, which is the predominant copper-carrying protein in the blood, has been suggested to have a marked effect on neutrophil life span. The present work is a comparative study on the effects of intact holo-ceruloplasmin, its copper-free (apo-) and partially proteolyzed forms, and synthetic free peptides RPYLKVFNPR (883-892) and RRPYLKVFNPRR (882-893) on polymorphonuclear leukocyte (PMNL, neutrophil) oxidant status and apoptosis...
January 12, 2018: Cells
https://www.readbyqxmd.com/read/29328426/relaxant-and-vasoprotective-effects-of-ginger-extracts-on-porcine-coronary-arteries
#14
Hsing-Chen Wu, Chi-Ting Horng, Shih-Chang Tsai, You-Li Lee, Shou-Cheng Hsu, Yi-Jen Tsai, Fuu-Jen Tsai, Jo-Hua Chiang, Daih-Huang Kuo, Jai-Sing Yang
Ginger (Zingiber officinale Roscoe) is a popular Chinese herbal medicine, which is considered to warm the stomach and dispel cold in traditional Chinese medicine. Ginger is widely used to treat stomach disorders, and it has been reported to exhibit antithrombotic activity via the inhibition of platelet aggregation and thromboxane B2 production in vitro. Cardiovascular disease is associated with the aberrant functioning of the heart and circulatory system; the relatively narrow vessels of the circulation are commonly affected and blocked by atherosclerosis, which may result in angina or heart attack...
January 11, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29328042/dynamics-of-changes-in-indices-of-endogenous-intoxication-in-patients-with-acute-small-intestinal-obstruction-in-case-of-reamberin-use-in-the-comprehensive-treatment
#15
V Skrypko, A Kovalenko, E Talikova
The objective of this research was to study changes in parameters, characterizing endogenous intoxication in patients with acute small bowel obstruction with Reamberin included into therapy scheme. Full physical examination and surgical treatment of 202 patients with acute small bowel obstruction were conducted. The control group included 30 healthy individuals. Dynamics of such clinical biochemical parameters as medium mass molecules (MMM), malondialdehyde (MDA), diene conjugates (DC) in blood serum were analyzed in preoperative period and on the 1st, 5th and 14th day of postoperative period...
December 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29324724/evaluation-of-oxidative-stress-levels-and-antioxidant-enzyme-activities-in-burst-fractures
#16
Fetullah Kuyumcu, Abdurrahman Aycan
BACKGROUND Spinal burst fractures are pathologies that occur in spinal injuries and cause significant mortality and morbidity as a result. Burst fractures in spinal cord injuries can result in rapid and significant oxidative stress. In addition to the primary injury in severe spinal cord injuries, subsequent secondary lesions are mainly due to inflammatory cascade activation and excessive production of free radicals. This study evaluated oxidative stress and antioxidant enzyme levels in burst fractures. MATERIAL AND METHODS Twenty patients with burst fractures were diagnosed and underwent surgery and 20 healthy control subjects were included in the study...
January 11, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29324716/the-effects-of-a-macromolecular-charring-agent-with-gas-phase-and-condense-phase-synergistic-flame-retardant-capability-on-the-properties-of-pp-ifr-composites
#17
Hongda Chen, Jihui Wang, Aiqing Ni, Anxin Ding, Xia Han, Ziheng Sun
In order to improve the efficiency of intumescent flame retardants (IFRs), a novel macromolecular charring agent named poly(ethanediamine-1,3,5-triazine-p-4-amino-2,2,6,6-tetramethylpiperidine) (PETAT) with gas phase and condense phase synergistic flame-retardant capability was synthesized and subsequently dispersed into polypropylene (PP) in combination with ammonium polyphosphate (APP) via a melt blending method. The chemical structure of PETAT was investigated by Fourier transform infrared spectroscopy (FTIR), and ¹H nuclear magnetic resonance (NMR) spectroscopy...
January 11, 2018: Materials
https://www.readbyqxmd.com/read/29324545/the-role-of-pathological-margin-distance-and-prognostic-factors-after-primary-surgery-in-squamous-cell-carcinoma-of-the-vulva
#18
Macit Arvas, Ilker Kahramanoglu, Tugan Bese, Hasan Turan, Isik Sozen, Sennur Ilvan, Fuat Demirkiran
OBJECTIVE: The aim of this study was to determine the impact of clear surgical margin distance and other factors associated with the recurrence and survival of patients with squamous cell carcinoma of the vulva. METHODS/MATERIALS: A total of 107 patients operated for vulvar carcinoma from 1996 to 2016 were included in the analysis. Patients were divided into subgroups with clear pathological margin of 2 mm or less, greater than 2 to less than 8 mm, and 8 mm or greater for the analysis of the prognostic impact of the clear margin distance...
January 10, 2018: International Journal of Gynecological Cancer
https://www.readbyqxmd.com/read/29324542/extramammary-paget-disease-of-the-vulva-a-case-series-examining-treatment-recurrence-and-malignant-transformation
#19
Roni Nitecki, Michelle Davis, Jaclyn C Watkins, Yiru E Wu, Allison F Vitonis, Michael G Muto, Ross S Berkowitz, Neil S Horowitz, Colleen M Feltmate
OBJECTIVES: Extramammary Paget disease (EMPD) of the vulva is a rare lesion with a high recurrence rate ranging from 12% to 61%. The rate of underlying adenocarcinoma varies, but in the largest series was reported at 4%. Given the rarity of the disease there is a paucity of data to optimize treatment. This study aims to describe the management and recurrence patterns in a tertiary care setting and to offer suggestions for management in a modern-day setting. METHODS: Patients with pathologically confirmed EMPD treated from 2000 to 2015 were retrospectively identified using an IRB approved database...
January 10, 2018: International Journal of Gynecological Cancer
https://www.readbyqxmd.com/read/29324293/biofilms-active-substrata-and-me
#20
REVIEW
Bruce E Rittmann
Having worked with biofilms since the 1970s, I know that they are ubiquitous in nature, of great value in water technology, and scientifically fascinating. Biofilms are naturally able to remove BOD, transform N, generate methane, and biodegrade micropollutants. What I also discovered is that biofilms can do a lot more for us in terms of providing environmental services if we give them a bit of help. Here, I explore how we can use active substrata to enable our biofilm partners to provide particularly challenging environmental services...
December 28, 2017: Water Research
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