keyword
MENU ▼
Read by QxMD icon Read
search

K2

keyword
https://www.readbyqxmd.com/read/28816526/echocardiographic-assessment-of-right-ventricle-dimensions-and-function-after-exposure-to-extreme-altitude-is-an-expedition-to-8000%C3%A2-m-hazardous-for-right-ventricular-function
#1
Marta Kurdziel, Jarosław Wasilewski, Karolina Gierszewska, Anna Kazik, Gracjan Pytel, Jacek Wacławski, Adam Krajewski, Anna Kurek, Lech Poloński, Mariusz Gąsior
Kurdziel, Marta, Jarosław Wasilewski, Karolina Gierszewska, Anna Kazik, Gracjan Pytel, Jacek Wacławski, Adam Krajewski, Anna Kurek, Lech Poloński, and Mariusz Gąsior. Echocardiographic assessment of right ventricle dimensions and function after exposure to extreme altitude: Is an expedition to 8000 m hazardous for right ventricular function? High Alt Med Biol 00:000-000, 2017.-Although the right ventricle (RV) is under great hypoxic stress at altitude, still little is known what happens to the RV after descent...
August 17, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/28813154/on-the-roles-of-free-electrons-and-h2o2-in-the-optical-breakdown-induced-photochemical-reduction-of-aqueous-aucl4
#2
Victoria Kathryn Meader, Mallory G John, Collin J Rodrigues, Katharine Moore Tibbetts
Free electrons and H2O2 formed in an optical breakdown plasma are found to di- rectly control the kinetics of [AuCl4]- reduction to form Au nanoparticles (AuNPs) during femtosecond laser-assisted synthesis of AuNPs. The formation rates of both free electrons and H2O2 strongly depend on the energy and duration of the 800 nm laser pulses over the ranges of 10 - 2400 μJ and 30 - 1500 fs. By monitoring the conversion of [AuCl4]- to AuNPs using in situ UV-vis spectroscopy during laser irradiation, the first- and second-order rate constants in the autocatalytic rate law, k1 and k2, were extracted and compared to the computed free electron densities and experimentally measured H2O2 formation rates...
August 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28808311/antitumor-properties-of-coenzyme-q0-against-human-ovarian-carcinoma-cells-via-induction-of-ros-mediated-apoptosis-and-cytoprotective-autophagy
#3
You-Cheng Hseu, Tai-Jung Tsai, Mallikarjuna Korivi, Jer-Yuh Liu, Hui-Jye Chen, Chung-Ming Lin, Yi-Chun Shen, Hsin-Ling Yang
Coenzyme Q0 (CoQ0, 2,3-dimethoxy-5-methyl-1,4-benzoquinone) has been reported to exert anticancer properties against human breast/lung cancer cells. This study investigated the in vitro and in vivo anticancer properties of CoQ0 on human ovarian carcinoma (SKOV-3) cells and xenografted nude mice, and revealed the underlying molecular mechanism. CoQ0 induced G2/M arrest through downregulation of cyclin B1/A and CDK1/K2 expressions. CoQ0-induced autophagy as a survival mechanism was evidenced by increased accumulation of LC3-II, GFP-LC3 puncta, AVOs formation and Beclin-1/Bcl-2 dysregulation...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28806081/chlorination-kinetics-of-11-nor-9-carboxy-%C3%AE-9-tetrahydrocannabinol-effects-of-ph-and-humic-acid
#4
Allison L Mackie, Yuri Park, Graham A Gagnon
The main psychoactive compound in marijuana, Δ9-tetrahydrocannabinol (THC), and its metabolites are emerging organic contaminants that have been detected in waste and surface waters. As legalization of marijuana for medical and recreational use continues, the effects of increased use and potency of marijuana on water and wastewater treatment processes and the environment should be considered. This study examined degradation kinetics of the main urinary metabolite of THC, 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THC-COOH) with chlorine...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28769742/reproducibility-of-quantitative-brain-imaging-using-a-pet-only-and-a-combined-pet-mr-system
#5
Martin L Lassen, Otto Muzik, Thomas Beyer, Marcus Hacker, Claes Nøhr Ladefoged, Jacobo Cal-González, Wolfgang Wadsak, Ivo Rausch, Oliver Langer, Martin Bauer
The purpose of this study was to test the feasibility of migrating a quantitative brain imaging protocol from a positron emission tomography (PET)-only system to an integrated PET/MR system. Potential differences in both absolute radiotracer concentration as well as in the derived kinetic parameters as a function of PET system choice have been investigated. Five healthy volunteers underwent dynamic (R)-[(11)C]verapamil imaging on the same day using a GE-Advance (PET-only) and a Siemens Biograph mMR system (PET/MR)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28761944/topochemical-polymerization-of-dumbbell-shaped-diacetylene-monomers-relationship-between-chemical-structure-molecular-packing-structure-and-gelation-property
#6
Dae-Yoon Kim, Sang-A Lee, Daseal Jung, Jahyeon Koo, Jin Soo Kim, Yeon-Tae Yu, Cheul-Ro Lee, Kwang-Un Jeong
Herein, we have synthesized novel photopolymerizable dumbbell-shaped diacetylene liquid crystal (LC) monomers by locating a diacetylene dicarboxylic acid group at the center and chemically connecting swallow-tails, such as hydrophobic alkyl chains (abbreviated as AT3DI) and amphiphilic biphenyl mesogens (abbreviated as BP3DI), with bisamide groups. Major phase transitions of dumbbell-shaped diacetylene monomers were identified using differential scanning calorimetry (DSC), polarized optical microscopy (POM), and Fourier transform infrared spectroscopy (FT IR)...
August 1, 2017: Soft Matter
https://www.readbyqxmd.com/read/28756502/aciduric-strains-of-lactobacillus-reuteri-and-lactobacillus-rhamnosus-isolated-from-human-feces-have-strong-adhesion-and-aggregation-properties
#7
Kyle B Klopper, Shelly M Deane, Leon M T Dicks
Human feces were streaked onto MRS Agar adjusted to pH 2.5, 3.0, and 6.4, respectively, and medium supplemented with 1.0% (w/v) bile salts. Two aciduric strains, identified as Lactobacillus reuteri HFI-LD5 and Lactobacillus rhamnosus HFI-K2 (based on 16S rDNA and recA sequences), were non-hemolytic and did not hydrolyze mucin. The surface of Lactobacillus reuteri HFI-LD5 cells has a weak negative charge, whereas Lactobacillus rhamnosus HFI-K2 has acidic and basic properties, and produces exopolysaccharides (EPS)...
July 29, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28756183/vitamin-k2-supplementation-and-arterial-stiffness-among-renal-transplant-recipients-a-single-arm-single-center-clinical-trial
#8
Anthony G Mansour, Essa Hariri, Yazan Daaboul, Serge Korjian, Andrew El Alam, Athanase D Protogerou, Hala Kilany, Albert Karam, Antoine Stephan, Sola Aoun Bahous
Subclinical vitamin K deficiency is prevalent among renal transplant recipients and is associated with an increased risk of cardiovascular disease. However, the association between vitamin K supplementation and improvement of arterial stiffness has not been explored in the renal transplant population. The KING trial (vitamin K2 In reNal Graft) is a single-arm study that evaluated the association between the change in vitamin K status and indices of arterial stiffness following 8 weeks of menaquinone-7 (vitamin K2) supplementation (360 μg once daily) among renal transplant recipients (n = 60)...
July 13, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28754968/dna-self-assembly-catalyzed-by-artificial-agents
#9
Chao Shi, Yifan Wang, Menghua Zhang, Cuiping Ma
Nucleic acids have been shown to be versatile molecules and engineered to produce various nanostructures. However, the poor rate of these uncatalyzed nucleic acid reactions has restricted the development and applications. Herein, we reported a novel finding that DNA self-assembly could be nonenzymatically catalyzed by artificial agents with an increasing dissociation rate constant K2. The catalytic role of several artificial agents in DNA self-assembly was verified by real-time fluorescent detection or agarose gel electrophoresis...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28750165/synthesis-and-electrophoretic-concentration-of-cadmium-sulfide-nanoparticles-in-reverse-microemulsions-of-tergitol-np-4-in-n-decane
#10
Aleksei N Kolodin, Vladimir V Tatarchuk, Alexander I Bulavchenko, Evgeniia V Poleeva
The kinetics of thiourea synthesis of CdS nanoparticles (NPs) in reverse microemulsions of Tergitol Np-4/n-decane was studied in the temperature range of 313-333 K by spectrophotometry, photon-correlation spectroscopy, and transmission electron microscopy. The formation of NPs is described by the kinetic model, including two consecutive steps: homogeneous nucleation in a solution as the first step and the autocatalytic growth of NPs due to heterogeneous reaction on a continuously increasing surface as the second step...
August 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28747788/klebsiella-pneumoniae-isolates-from-meningitis-epidemiology-virulence-and-antibiotic-resistance
#11
Yee-Huang Ku, Yin-Ching Chuang, Chi-Chung Chen, Mei-Feng Lee, Yan-Chang Yang, Hung-Jen Tang, Wen-Liang Yu
Klebsiella pneumoniae (KP) resistance to broad-spectrum cephalosporin (BSC) in meningitis is important because of limited therapeutic options. To investigate the antibiotic resistance, virulence and epidemiology of KP in meningitis, we conducted a retrospective study for 33 non-metastatic isolates, including primary meningitis (n = 20) and post-craniotomy meningitis (n = 13) collected from 1999 to 2013. BSC resistance was found in 9 (27.3%) isolates, all from post-craniotomy meningitis, harboring bla SHV-5 (n = 6), bla CMY-2 (n = 2), bla DHA-1 (n = 2), and bla TEM-1B (n = 1)...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28739781/structural-insights-into-the-tla-3-extended-spectrum-%C3%AE-lactamase-and-its-inhibition-by-avibactam-and-op0595
#12
Wanchun Jin, Jun-Ichi Wachino, Yoshihiro Yamaguchi, Kouji Kimura, Anupriya Kumar, Mototsugu Yamada, Akihiro Morinaka, Yoshiaki Sakamaki, Minoru Yonezawa, Hiromasa Kurosaki, Yoshichika Arakawa
Development of effective inhibitors that block extended-spectrum β-lactamases (ESBLs) and restore the action of β-lactams represents an effective strategy against ESBL-producing Enterobacteriaceae We evaluated the inhibitory effect of the diazabicyclooctanes avibactam and OP0595 against TLA-3, an ESBL we identified previously. Avibactam and OP0595 inhibited TLA-3 with apparent Ki app of 1.71 ± 0.10 and 1.49 ± 0.05 μM, respectively, and could restore susceptibility to cephalosporins in TLA-3-producing Escherichia coli The acylation rate constant [k2/K, (3...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28738193/degree-of-keratinization-is-an-independent-prognostic-factor-in-oral-squamous-cell-carcinoma
#13
Susanne Wolfer, Stefan Elstner, Stefan Schultze-Mosgau
PURPOSE: Keratinization is a routinely reported histologic feature in head and neck cancer. In contrast to numerous clinicopathologic parameters, the prognostic value of keratinization in oral squamous cell carcinoma (OSCC) is rarely reported in the literature. The purpose of this study was to review the outcome of patients with OSCC with a special focus on the degree of keratinization. PATIENTS AND METHODS: In this retrospective cohort study, we evaluated the medical records at the Department of Oral and Maxillofacial Surgery, Jena University Hospital, and investigated the outcome of patients with OSCC with disease-free survival and disease-specific survival according to the degree of keratinization...
June 30, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28736222/hypermucoviscosity-rmpa-and-aerobactin-are-associated-with-community-acquired-klebsiella-pneumoniae-bacteremic-isolates-causing-liver-abscess-in-singapore
#14
Thean Yen Tan, Melissa Ong, Yvonne Cheng, Lily Siew Yong Ng
INTRODUCTION: This retrospective study investigated the clinical etiology of community-acquired bacteremic Klebsiellapneumoniae infections, and characterized laboratory and genetic markers which may be associated with primary liver abscess (PLA). METHODS: Community-onset K. pneumoniae bacteremic episodes from 2010 to 2011 were identified from the laboratory information system. Isolates were retrieved for susceptibility testing, hypermucoviscosity testing, PCR-based serotyping (K1, K2 and K5) and PCR detection of virulence genes (rmpA, alls, kfu and aerobactin)...
July 14, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28730606/technical-note-empirical-altitude-correction-factors-for-well-chamber-measurements-of-permanent-prostate-and-breast-seed-implant-sources
#15
Elizabeth Watt, David P Spencer, Tyler Meyer
PURPOSE: Previous studies in the literature have measured an altitude effect for low-energy brachytherapy seeds; a correction factor applied in addition to PTP to account for the breakdown of Bragg-Gray cavity theory at low energies in well-type ionization chambers. In clinical practice, many centres use altitude correction factors that are not seed-model-specific. The purpose of this work is to present altitude correction factors for several seed models without documented factors in the literature...
July 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28729207/first-two-cases-of-severe-multifocal-infections-caused-by-klebsiella-pneumoniae-in-switzerland-characterization-of-an-atypical-non-k1-k2-serotype-strain-causing-liver-abscess-and-endocarditis
#16
Baharak Babouee Flury, Valentina Donà, Niccolò Buetti, Hansjakob Furrer, Andrea Endimiani
BACKGROUND: We describe the first two multifocal invasive infections due to Klebsiella pneumoniae recently observed in Switzerland. METHODS: Phenotypic (MIC assays and string test) and molecular analyses (PCR/Sequencing for bla, virulence factor genes and whole genome sequencing for one strain) were performed to characterize the causative K. pneumoniae isolates. RESULTS: Both K. pneumoniae isolates (Kp1 and Kp2) were pan-susceptible to antibiotics and produced narrow-spectrum SHV β-lactamases...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28718634/porous-uranyl-borophosphates-with-unique-three-dimensional-open-framework-structures
#17
Yucheng Hao, Gabriel L Murphy, Dirk Bosbach, Giuseppe Modolo, Thomas E Albrecht-Schmitt, Evgeny V Alekseev
Two novel alkali-metal uranyl borophosphates have been prepared and characterized for the first time, namely, K5(UO2)2[B2P3O12(OH)]2(OH)(H2O)2 and K2(UO2)12[B(H2PO4)4](PO4)8(OH)(H2O)6 denoted as KUPB1 and KUPB2, respectively. KUPB1 was obtained hydrothermally at 220 °C and crystallizes in a monoclinic structure in the chiral space group P21. The unit cell parameters of KUPB1 are a = 6.7623(2) Å, b = 19.5584(7) Å, c = 11.0110(4) Å, α = γ = 90°, β = 95.579(3)°, and V = 1449.42(8) Å(3). It features a unique three-dimensional (3D) open-framework structure, composed of two corner-sharing linked one-dimensional (1D) anionic borophosphates (BP), [B2P3O13](5-), along the a axis and uranyl phosphate (UP), [(UO2)(PO4)3](7-), chains along the c axis, further bridged by PO4 tetrahedra...
August 7, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28715212/kinetics-of-electrophilic-alkylations-of-barbiturate-and-thiobarbiturate-anions
#18
Alexander Schade, Ivan Tchernook, Mirko Bauer, Alexander Oehlke, Martin Breugst, Joachim Friedrich, Stefan Spange
Second-order rate constants (k2) of the reactions of various barbiturate anions such as the parent barbiturate, 1,3-dimethylbarbiturate, 2-thiobarbiturate, and 1,3-diethyl-2-thiobarbiturate with diarylcarbenium ions and Michael acceptors have been determined in dimethyl sulfoxide solution at 20 °C. The reactivity parameters N and sN of the barbiturate anions were derived from the linear plots of log k2 versus the electrophilicity parameters E of these reference electrophiles, according to the linear-free-energy relationship log k2 (20 °C) = sN (E + N)...
July 31, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28698808/vitamins-k1-and-k2-the-emerging-group-of-vitamins-required-for-human-health
#19
REVIEW
Gerry Kurt Schwalfenberg
OBJECTIVE: To review the evidence for the use of vitamin K supplementation in clinical conditions such as osteoporosis, vascular calcification, arthritis, cancer, renal calculi, diabetes, and warfarin therapy. QUALITY OF EVIDENCE: PubMed was searched for articles on vitamin K (K1 and K2) along with books and conference proceedings and health conditions listed above. Level I and II evidence supports the use of vitamins K1 and K2 in osteoporosis and Level II evidence supports vitamin K2 in prevention of coronary calcification and cardiovascular disease...
2017: Journal of Nutrition and Metabolism
https://www.readbyqxmd.com/read/28694726/a-nationwide-multicentre-study-in-turkey-for-establishing-reference-intervals-of-haematological-parameters-with-novel-use-of-a-panel-of-whole-blood
#20
Yesim Ozarda, Kiyoshi Ichihara, Ebubekir Bakan, Harun Polat, Nurinnisa Ozturk, Nurcan K Baygutalp, Fatma Taneli, Yesim Guvenc, Murat Ormen, Zubeyde Erbayraktar, Nurten Aksoy, Hatice Sezen, Meltem Demir, Gulcin Eskandari, Gurbuz Polat, Nuriye Mete, Hatice Yuksel, Husamettin Vatansev, Fatma Gun, Okhan Akin, Ozlem Ceylan, Tevfik Noyan, Ozgul Gozlukaya, Yuksel Aliyazicioglu, Sevim Kahraman, Melahat Dirican, Gul Ozlem Tuncer, Shogo Kimura, Pinar Eker
INTRODUCTION: A nationwide multicentre study was conducted to establish well-defined reference intervals (RIs) of haematological parameters for the Turkish population in consideration of sources of variation in reference values (RVs). MATERIALS AND METHODS: K2-EDTA whole blood samples (total of 3363) were collected from 12 laboratories. Sera were also collected for measurements of iron, UIBC, TIBC, and ferritin for use in the latent abnormal values exclusion (LAVE) method...
June 15, 2017: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
keyword
keyword
9986
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"