keyword
MENU ▼
Read by QxMD icon Read
search

Kr

keyword
https://www.readbyqxmd.com/read/28441478/energy-transfer-kinetics-driven-by-mid-infrared-amplified-spontaneous-emissions-after-two-photon-excitation-from-xe-s0-to-the-xe-6p-1-2-0-state
#1
Shan He, Yafu Guan, Dong Liu, Xusheng Xia, Baodong Gai, Shu Hu, Jingwei Guo, Fengting Sang, Yuqi Jin
In optically pumped laser systems, rare gas lasers (RGLs) are a field of great interest for researchers. Gas laser regimes with metastable Ne, Ar, and Kr atoms have been investigated, while studies of RGLs based on metastable Xe are sparse. In this work, when a strong excitation laser (2.92 mJ/pulse, 7.44*10^5 W/cm2) was applied to excite Xe atoms from the ground state to the 6p[1/2]0 state, an interesting phenomenon emerged: An intense fluorescence of 980 nm (6p[1/2]1-6s[3/2]2) was produced. However, when the energy of excitation laser was decreased to 0...
April 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28437264/magnesium-sulphate-improves-pulmonary-function-after-video-assisted-thoracoscopic-surgery-a-randomised-double-blind-placebo-controlled-study
#2
Hye-Min Sohn, Sang-Hoon Jheon, Sunwoo Nam, Sang-Hwan Do
BACKGROUND: Reduced lung volumes are unavoidable after lung resection surgery. Magnesium sulphate (MgSO4) administration has been reported to reduce the requirement for neuromuscular blocking drugs and postoperative analgesics in surgical patients. OBJECTIVE: To investigate the effect of MgSO4 on pulmonary function after video-assisted thoracoscopic surgery (VATS). DESIGN: A randomised, double-blind, placebo-controlled trial. SETTING: A university tertiary care centre...
April 21, 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28435067/the-mitogen-activated-protein-kinase-kinase-9-mkk9-modulates-nitrogen-acquisition-and-anthocyanin-accumulation-under-nitrogen-limiting-condition-in-arabidopsis
#3
Juan Luo, Xu Wang, Lei Feng, Yan Li, Jun-Xian He
Nitrogen (N) plays important roles as both a macronutrient and signal in plant growth and development. However, our understanding of N signaling and/or response mechanisms in plants is still limited. Here, we show that the mitogen-activated protein kinase kinase 9 (MKK9) is involved in plant N responses in Arabidopsis by regulating production of anthocyanins and the ability of N acquisition under low N conditions. Transgenic plants that express a constitutively active version of MKK9 (MKK9(DD)) showed decreased accumulation of anthocynanins and reduced expression of key anthocyanin biosynthetic genes under low N condition compared to the plants expressing the inactive form of MKK9 (MKK9(KR))...
April 20, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28430424/elucidation-of-the-stereospecificity-of-c-methyltransferases-from-trans-at-polyketide-synthases
#4
Xinqiang Xie, Chaitan Khosla, David E Cane
S-Adenosyl methionine (SAM)-dependent C-methyltransferases are responsible for the C2-methylation of 3-ketoacyl-acyl carrier protein (ACP) intermediates to give the corresponding 2-methy-3-ketoacyl-ACP products during bacterial polyketide biosynthesis mediated by trans-AT polyketide synthases that lack integrated acyl transferase (AT) domains. A coupled ketoreductase (KR) assay was used to assign the stereochemistry of the C-methyltransferase-catalyzed reaction. Samples of chemoenzymatically-generated 3-ketopentanoyl-ACP (9) were incubated with SAM and BonMT2 from module 2 of the bongkrekic acid polyke-tide synthase...
April 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28423279/ngmcp-noble-gas-bound-half-sandwich-complexes-ng-he-rn-m-be-ba-cp-%C3%AE-5-c5h5
#5
Ranajit Saha, Sudip Pan, Pratim Kumar Chattaraj
Structures, bonding and stability half-sandwich complexes with general formula, NgMCp+ (Ng = He-Rn, M = Be-Ba, Cp = 5-C5H5) are analyzed through ab initio computation. MCp+ complexes possess remarkable Ng binding ability, particularly for M = Be and Mg. While for Ar-Rn bound analogues the bond dissociation energy in the former complex ranges within 17.5-28.0 kcal mol-1, it becomes 10.4-18.7 kcal mol-1 in the latter complex. In fact, BeCp+ is able to form strong bond with the two most inert elements, He and Ne...
April 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28423137/psychometric-properties-of-the-vulnerability-to-abuse-screening-scale-for-screening-abuse-of-older-adults
#6
Raquel Batista Dantas, Graziella Lage Oliveira, Andréa Maria Silveira
OBJECTIVE: Adapt and evaluate the psychometric properties of the Vulnerability to Abuse Screening Scale to identify risk of domestic violence against older adults in Brazil. METHODS: The instrument was adapted and validated in a sample of 151 older adults from a geriatric reference center in the municipality of Belo Horizonte, State of Minas Gerais, in 2014. We collected sociodemographic, clinical, and abuse-related information, and verified reliability by reproducibility in a sample of 55 older people, who underwent re-testing of the instrument seven days after the first application...
April 10, 2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28420098/development-and-validation-of-a-questionnaire-to-assess-knowledge-threat-and-coping-appraisal-and-intention-to-practice-healthy-behaviors-related-to-non-communicable-diseases-in-the-thai-population
#7
Kanittha Chamroonsawasdi, Suthat Chottanapund, Pravich Tunyasitthisundhorn, Nawaphan Phokaewsuksa, Tassanee Ruksujarit, Pawarat Phasuksathaporn
Non-communicable diseases (NCDs) are important issues in Thailand and health sectors are now focusing on modifiable risks that include cognitive, affective and behavioral factors. This study aimed to develop and validate a questionnaire to assess knowledge about NCDs, threat appraisal, coping appraisal and intention to practice based on protection motivation theory. Content validity was determined by the mean of the item content validity index (I-CVI) from five experts. The questionnaire was pilot tested for difficulty of knowledge items and reliability test using the Kuder-Richardson (KR)-20 and Cronbach's alpha coefficient among 30 Thai adult subjects in the health office for two sub-districts...
April 14, 2017: Behavioral Sciences
https://www.readbyqxmd.com/read/28419290/svmqa-support-vector-machine-based-protein-single-model-quality-assessment
#8
Balachandran Manavalan, Jooyoung Lee
Motivation: The accurate ranking of predicted structural models and selecting the best model from a given candidate pool remain as open problems in the field of structural bioinformatics. The quality assessment (QA) methods used to address these problems can be grouped into two categories: consensus methods and single-model methods. Consensus methods in general perform better and attain higher correlation between predicted and true quality measures. However, these methods frequently fail to generate proper quality scores for native-like structures which are distinct from the rest of the pool...
April 13, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28418703/radioresistance-of-adenine-to-cosmic-rays
#9
Gabriel S Vignoli Muniz, Christian F Mejía, Rafael Martinez, Basile Auge, Hermann Rothard, Alicja Domaracka, Philippe Boduch
The presence of nucleobases in carbonaceous meteorites on Earth is an indication of the existence of this class of molecules in outer space. However, space is permeated by ionizing radiation, which can have damaging effects on these molecules. Adenine is a purine nucleobase that amalgamates important biomolecules such as DNA, RNA, and ATP. Adenine has a unique importance in biochemistry and therefore life. The aim of this work was to study the effects of cosmic ray analogues on solid adenine and estimate its survival when exposed to corpuscular radiation...
April 2017: Astrobiology
https://www.readbyqxmd.com/read/28415403/design-and-synthesis-of-reduced-graphene-oxide-based-supramolecular-scaffold-a-benign-microbial-resistant-network-for-enzyme-immobilization-and-cell-growth
#10
Maloy Kr Mondal, Suprabhat Mukherjee, Swadhin K Saha, Pranesh Chowdhury, Santi P Sinha Babu
The present study describes the synthesis, characterization and biological application of reduced graphene oxide - chitosan (GC) based benign supramolecular scaffold (SMS). Various spectroscopic and microscopic analyses established the supramolecular interaction in between rGO and chitosan. The active performance of the developed material towards microbial resistivity, in vitro cell growth and as a scaffold for enzyme immobilizing matrix illustrates its unique implementation. Immobilization of polyphenol oxidase (PPO) onto GC lowers the Michaelis- Menten constant (Km) value and facilitates to achieve maximum velocity at low substrate concentration...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414802/neuronal-cell-fate-specification-by-the-molecular-convergence-of-different-spatio-temporal-cues-on-a-common-initiator-terminal-selector-gene
#11
Johannes Stratmann, Stefan Thor
The extensive genetic regulatory flows underlying specification of different neuronal subtypes are not well understood at the molecular level. The Nplp1 neuropeptide neurons in the developing Drosophila nerve cord belong to two sub-classes; Tv1 and dAp neurons, generated by two distinct progenitors. Nplp1 neurons are specified by spatial cues; the Hox homeotic network and GATA factor grn, and temporal cues; the hb -> Kr -> Pdm -> cas -> grh temporal cascade. These spatio-temporal cues combine into two distinct codes; one for Tv1 and one for dAp neurons that activate a common terminal selector feedforward cascade of col -> ap/eya -> dimm -> Nplp1...
April 17, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28409460/killerred-as-a-tool-to-study-the-cellular-responses-to-peroxisome-derived-oxidative-stress
#12
Marc Fransen, Chantal Brees
Many biological processes and cell fate decisions are modulated by changes in redox environment. To gain insight into how subcellular compartmentalization of reactive oxygen species (ROS) formation contributes to (site-specific) redox signaling and oxidative stress responses, it is critical to have access to tools that allow tight spatial and temporal control of ROS production. Over the past decade, the use of genetically encoded photosensitizers has attracted growing interest of researchers because these proteins can be easily targeted to various subcellular compartments and allow for controlled release of ROS when excited by light...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28408902/the-naturally-occurring-host-defense-peptide-ll-37-and-its-truncated-mimetics-ke-18-and-kr-12-have-selected-biocidal-and-antibiofilm-activities-against-candida-albicans-staphylococcus-aureus-and-escherichia-coli-in-vitro
#13
Yu Luo, Denise T F McLean, Gerard J Linden, Danny F McAuley, Ronan McMullan, Fionnuala T Lundy
Amongst the recognized classes of naturally occurring antimicrobials, human host defense peptides are an important group with an advantage (given their source) that they should be readily translatable to medicinal products. It is also plausible that truncated versions will display some of the biological activities of the parent peptide, with the benefit that they are less costly to synthesize using solid-phase chemistry. The host defense peptide, LL-37, and two truncated mimetics, KE-18 and KR-12, were tested for their inhibitory effects and antibiofilm properties against Candida albicans, Staphylococcus aureus, and Escherichia coli, microorganisms commonly implicated in biofilm-related infections such as ventilator-associated pneumonia (VAP)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28405665/expanding-the-substrate-scope-of-phenylalanine-ammonia-lyase-from-petroselinum-crispum-towards-styrylalanines
#14
László Csaba Bencze, Alina Filip, Gergely Bánóczi, Monica Ioana Toşa, Florin Dan Irimie, Ákos Gellért, László Poppe, Csaba Paizs
This study focuses on the expansion of the substrate scope of phenylalanine ammonia-lyase from Petroselinum crispum (PcPAL) towards the l-enantiomers of racemic styrylalanines rac-1a-d - which are less studied and synthetically challenging unnatural amino acids - by reshaping the aromatic binding pocket of the active site of PcPAL by point mutations. Ammonia elimination from l-styrylalanine (l-1a) catalyzed by non-mutated PcPAL (wt-PcPAL) took place with a 777-fold lower kcat/KM value than the deamination of the natural substrate, l-Phe...
April 13, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28402675/mechanistic-insight-into-the-molecular-tio2-mediated-gas-phase-detoxication-of-dmmp-a-theoretical-approach
#15
Tamalika Ash, Tanay Debnath, Avik Ghosh, Abhijit Kr Das
The detoxication of DMMP (Dimethyl methylphosphonate) mediated by molecular TiO2 has been investigated computationally using density functional theory (DFT). From our previous studies, it is evident that the unimolecular detoxication of OPCs (Organophosphorus compound) is kinetically unfeasible at room temperature due to significantly high activation barrier. Thus, the aim of our work is to find out whether molecular TiO2 can make any significant impact on the kinetic feasibility of the detoxication processes or not...
April 12, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28402667/exploring-cation-%C3%AF-interaction-in-the-complexes-with-b%C3%A2-b-triple-bond-a-dft-study
#16
Pradip K Bhattacharyya
Density functional theory calculations on metal ion-π interactions in cation-π complexes of diboryne and sandwiches of diboryne and benzene formed via metal ions were performed to understand the strength of interaction in these complexes. Results suggest that apart from the smaller metal ions (Li(+), Be(2+)), larger ions (Na(+), Mg(2+), Ca(2+), and Al(3+)) can also form cation-π complexes with B≡B triple bond and interaction energies of the complexes with larger metal ions (possessing same charges) are less than those obtained with smaller ions...
April 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28401857/premature-complexes-and-pauses
#17
Sandeep Kr Golchha, Neeta Bachani, Yash Lokhandwala
No abstract text is available yet for this article.
January 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/28398708/evidence-of-gene-gene-interactions-between-mthfd1-and-mthfr-in-relation-to-anterior-encephalocele-susceptibility-in-northeast-india
#18
Hemonta Kr Dutta, Debasish Borbora, Mauchumi Baruah, Kanwar Narain
BACKGROUND: Anterior encephalocele (AE) is a rare congenital anomaly of the central nervous system which is thought to be associated with genetic defects in folate metabolism. METHODS: This case-control study investigated the interactions of methylenetetrahydrofolate dehydrogenase 1 (MTHFD1)-1958G>A (rs2236225) and the methylenetetrahydrofolate reductase (MTHFR) - 677C>T (rs1801133) and 1298A>C (rs1801131) polymorphisms with the risk of AE in the Northeast Indian population...
April 3, 2017: Birth Defects Res
https://www.readbyqxmd.com/read/28388137/modelling-the-matrix-shift-on-the-vibrational-frequency-of-tho-by-dft-d3-calculations
#19
Attila Kovács, Joanna E Rode
Benchmark calculations with a goal to find dispersion-corrected DFT-D3 methods suitable for a reliable estimation of matrix shifts on the vibrational frequency were carried out on the ThO molecule in three rare gas (Rg = Ne, Ar, and Kr) matrices. The matrices were modelled by the explicit approach, in which a single and a double shell of Rg atoms around ThO was considered. The selection of exchange-correlation functionals was based on test calculations on triatomic ThO⋯Rg models. The B3LYP, PBE0, CAM-B3LYP, and LC-ωPBE functionals were found to be the best suited for the estimation of matrix shifts...
March 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28388007/aberrant-intracellular-metabolism-of-t-dm1-confers-t-dm1-resistance-in-her2-positive-gastric-cancer-cells
#20
Hongbin Wang, Wenqian Wang, Yongping Xu, Yong Yang, Xiaoyan Chen, Haitian Quan, Liguang Lou
T-DM1 (Kadcyla), an antibody-drug conjugate (ADC) consisting of HER2-targeted monoclonal antibody trastuzumab linked to anti-microtubule agent mertansine (DM1), has been approved for the treatment of HER2-positive metastatic breast cancer. To date, acquired resistance arises to be a major obstacle to T-DM1 treatment, and mechanisms remain incompletely understood. In the present study, we established a T-DM1-resistant N87-KR cell line from HER2-positive N87 gastric cancer cells to investigate mechanisms of acquired resistance and develop strategies for overcoming it...
April 7, 2017: Cancer Science
keyword
keyword
61025
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"