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https://www.readbyqxmd.com/read/29925049/anionic-and-cationic-drug-sorption-on-interpolyelectrolyte-complexes
#1
C R M de Lima, D N Gomes, J R de Morais Filho, M R Pereira, J L C Fonseca
Interpolyelectrolyte complexes of chitosan and poly(sodium 4-styrenesulfonate) [NaPSS] were synthesized and obtained in the form of solid particles, with two different sulfonate to aminium molar ratios: 0.7, resulting in particles with positive zeta potential (IPEC+ ), and 1.4, yielding particles with negative zeta potential (IPEC- ). Both particles were characterized as potential drug sorbents using differently charged drugs: sodium cromoglycate (negatively charged), and tetracycline hydrochloride (positively charged)...
June 15, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29925019/refinement-of-peptide-conformational-ensembles-by-2d-ir-spectroscopy-application-to-ala%C3%A2-ala%C3%A2-ala
#2
Chi-Jui Feng, Balamurugan Dhayalan, Andrei Tokmakoff
Characterizing ensembles of intrinsically disordered proteins is experimentally challenging because of the ill-conditioned nature of ensemble determination with limited data and the intrinsic fast dynamics of the conformational ensemble. Amide I two-dimensional infrared (2D IR) spectroscopy has picosecond time resolution to freeze structural ensembles as needed for probing disordered-protein ensembles and conformational dynamics. Also, developments in amide I computational spectroscopy now allow a quantitative and direct prediction of amide I spectra based on conformational distributions drawn from molecular dynamics simulations, providing a route to ensemble refinement against experimental spectra...
June 19, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29924930/selective-adsorption-of-rare-earth-elements-over-functionalized-cr-mil-101
#3
Yu-Ri Lee, Kwangsun Yu, Seenu Ravi, Wha-Seung Ahn
Efficient rare earth elements (REEs) separation and recovery are crucial to meet the ever-increasing demand for REEs extensively used in various high technology devices. Herein, we synthesized a highly stable chromium-based metal-organic framework (MOF) structure, Cr-MIL-101, and its derivatives with different organic functional groups: MIL-101-NH2 , MIL-101-ED (ED: ethylenediamine), MIL-101-DETA (DETA: diethylenetriamine), and MIL-101-PMIDA (PMIDA: N-(phosphonomethyl) iminodiacetic acid), and explored their effectiveness in the separation and recovery of La3+ , Ce3+ , Nd3+ , Sm3+ , and Gd3+ in aqueous solutions...
June 20, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29924622/unmasking-rare-large-amplitude-motions-in-d-2-tagged-i-%C3%A2-h-2-o-2-isotopomers-with-two-color-infrared-infrared-vibrational-predissociation-spectroscopy-%C3%A2
#4
Nan Yang, Chinh H Duong, Patrick J Kelleher, Mark A Johnson
We describe a two-color, isotopomer-selective IR-IR population labeling method that can monitor very slow spectral diffusion of OH oscillators in H-bonded networks and apply it to the I- ·(HDO)·(D2 O) and I- ·(H2 O)·(D2 O) systems, cryogenically cooled and D2 -tagged at an ion trap temperature of 15 K. These measurements reveal very large (>400 cm-1 ), spontaneous spectral shifts despite the fact that the predissociation spectra in the OH stretching region of both isotopologues are sharp and readily assigned to four fundamentals of largely decoupled OH oscillators held in a cyclic H-bonded network...
June 20, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29924134/association-between-serotonin-2c-receptor-gene-htr2c-polymorphisms-and-psychopathological-symptoms-in-children-and-adolescents
#5
L A Paes, O H Della Torre, T B Henriques, M P de Mello, E H R V Celeri, P Dalgalarrondo, G Guerra Júnior, A Dos Santos Júnior
Serotonin 2C receptors (5HT2C) are involved in serotonin-driven dynamic equilibrium adjustments responsible for homeostatic stability in brain structures that modulate behavior and emotions. Single nucleotide polymorphisms (SNPs) from the serotonin 2C receptor gene (HTR2C) have been associated with several neurological and mental disorders, including abnormalities in cognitive and emotional processes. The aim of this study was to evaluate the association between the rs6318 SNP of the HTR2C gene and behavioral characteristics exhibited by children and adolescents based on the Child Behavior Checklist (CBCL/6-18) inventory...
2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29923568/dendritic-polyelectrolytes-as-seen-by-the-poisson-boltzmann-flory-theory
#6
J S Kłos, J Milewski
G3-G9 dendritic polyelectrolytes accompanied by counterions are investigated using the Poisson-Boltzmann-Flory theory. Within this approach we solve numerically the Poisson-Boltzmann equation for the mean electrostatic potential and minimize the Poisson-Boltzmann-Flory free energy with respect to the size of the molecules. Such a scheme enables us to inspect the conformational and electrostatic properties of the dendrimers in equilibrium based on their response to varying the dendrimer generation. The calculations indicate that the G3-G6 dendrimers exist in the polyelectrolyte regime where absorption of counterions into the volume of the molecules is minor...
June 20, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29923498/interactions-of-methacryloylated-gelatin-and-heparin-modulate-physico-chemical-properties-of-hydrogels-and-release-of-vascular-endothelial-growth-factor
#7
Christiane Claaßen, Alexander Southan, Jana Grübel, Günter E M Tovar, Kirsten Borchers
Gelatin hydrogels are used as tissue engineering scaffolds and systems for controlled release due to their inherent biodegradability and biocompatibility. In this study gelatin methacryloyl (-acetyl) (GM/A) with various degrees of methacryloylation (DM) and methacryl-modified heparin (HepM) were cross-linked radically via thermal-redox initiation. Investigation of gel yields (79.4%-85.8%) and equilibrium degrees of swelling (EDS; 564.8%-750.3%) by an experimental design approach suggested interaction effects between applied HepM mass-fraction and DM of gelatin...
June 20, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29923381/-efficiency-analysis-of-ex16-10y-kit-on-detection-of-the-uygur-population-in-xinjiang-province
#8
G Bi, C Zhang, Y Dong, H T Jiao, L Dong, H G Zhou
OBJECTIVES: To analyse the efficiency of EX16+10Y kit on the forensic detection of the Uygur in Xinjiang province. METHODS: The blood samples were extracted from 4 620 male individuals of Uygur in Xinjiang province, and amplified by EX16+10Y kit. The typing of amplification products was performed by 3130 xl genetic analyzer. RESULTS: The genotyping graphs of 15 autosomal STR loci and 10 Y-chromosomal STR loci from 4 620 male individuals of Uygur in Xinjiang province were acquired completely...
April 2018: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29923375/-establishment-of-43-plex-snp-typing-system-and-its-forensic-application
#9
Y N Li, M Li, L Jiang, X H Luan, N Liang, Q N Xu, J S Zhang, M C Tang, Y N Bian, L Q Chen
OBJECTIVES: To evaluate the application of 43-plex SNP typing system in forensic science. METHODS: The typing of 43 SNP loci in 123 unrelated Han individuals from East China was detected by MALDI-TOF-MS. The application value of 43-plex SNP typing system was assessed according to the forensic parameters of population genetics. RESULTS: All the 43 SNP loci of 123 individuals showed no significant departure from Hardy-Weinberg equilibrium ( P >0...
April 2018: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29923374/-forensic-application-of-sifastr%C3%A2-23plex-dna-id-system-in-han-population-of-eastern-china
#10
Y Bao, X Sheng, J S Zhang, M Li, Y N Li, Q N Xu, C T Li, L Q Chen
OBJECTIVES: To investigate the genetic polymorphism of 21 autosomal STR loci and DYS391 locus of SiFaSTR™ 23plex DNA ID system in Han population of eastern China and to evaluate its application value in forensic science. METHODS: Typing test of 2 000 unrelated individuals was performed using SiFaSTR™ 23plex DNA ID system. The population genetic parameters of STR loci were statistically analysed. A total of 3 198 parentage confirmed cases were detected with that system and the mutation conditions were observed in 21 autosomal STR loci...
April 2018: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29923075/genetic-polymorphism-of-15-autosomal-short-tandem-repeats-in-baloch-population-of-pakistan
#11
Aleena Ahmad Khan, Rukhsana Perveen, Nadeem Sheikh, Babar Hilal Ahmad Abbasi, Zunaira Batool, Muhammad Shahzad, Sana Kaleem
Allele frequencies and forensic statistical parameters of 15 autosomal short tandem repeats (STRs) were evaluated in 200 genetically unrelated individuals of the Baloch population of Pakistan. Total 155 alleles were observed with allele frequencies ranged from 0.003 to 0.425. Among the 15 STRs, D2S1338 was found to be the most polymorphic and discriminating locus while TPOX was the least polymorphic and discriminating locus. The combined power of discrimination (CPD), combined power of exclusion (CPE), and combined matching probability (CMP) were found to be 0...
June 20, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29923049/improvement-of-activated-carbon-characteristics-by-sonication-and-its-application-for-pharmaceutical-contaminant-adsorption
#12
Andressa Cristiana Fröhlich, Glaydson Simoes Dos Reis, Flávio André Pavan, Éder Cláudio Lima, Edson Luiz Foletto, Guilherme Luiz Dotto
Sonicated activated carbon (SAC) was developed and used to remove ibuprofen and ketoprofen from aqueous media by adsorption. A standard activated carbon sample (AC) was used as comparison. Both adsorbents were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), N2 adsorption isotherms (Brunauer, Emmett, and Teller (BET)), helium gas pycnometry, and scanning electron microscopy (SEM). In the adsorption study, kinetics, equilibrium, and thermodynamics were evaluated. SAC presented better characteristics than AC...
June 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29922930/extracellular-volume-fraction-determined-by-equilibrium-contrast-enhanced-multidetector-computed-tomography-as-a-prognostic-factor-in-unresectable-pancreatic-adenocarcinoma-treated-with-chemotherapy
#13
Yoshihiko Fukukura, Yuichi Kumagae, Ryutaro Higashi, Hiroto Hakamada, Koji Takumi, Kosei Maemura, Michiyo Higashi, Kiyohisa Kamimura, Masanori Nakajo, Takashi Yoshiura
OBJECTIVES: To assess whether extracellular volume (ECV) fraction with equilibrium contrast-enhanced multidetector computed tomography (MDCT) predicts outcomes for unresectable pancreatic adenocarcinoma patients treated with chemotherapy METHODS: Sixty-seven patients (42 men, 25 women; mean age, 67.5 years; range, 45-83 years) with histologically confirmed surgically unresectable pancreatic adenocarcinoma underwent contrast-enhanced MDCT before systemic chemotherapy. Tumour contrast enhancement (CE) and ECV fraction were calculated using region-of-interest measurement within the pancreatic adenocarcinoma and aorta on unenhanced and equilibrium phase-enhanced CT...
June 19, 2018: European Radiology
https://www.readbyqxmd.com/read/29922796/interception-of-intermediates-in-phosphine-oxidation-by-mesityl-nitrile-n-oxide-using-frustrated-lewis-pairs
#14
Kevin M Szkop, Diya Zhu, Lauren E Longobardi, Julian Heck, Douglas W Stephan
Phosphine oxidation by MesCNO is rapid; however, an FLP strategy intercepts the 1,3 addition products including [MesC(R3P)NOB(C6F5)3] (R = Ph 1, p-tol 2), [MesC(Mes2PH)NOB(C6F5)3] 3 (MesC(NOB(C6F5)3)Ph2P)2(CH2)n (n = 2: 4, 3: 5) and [MesC(Ph3P)NOB(C6F4H)3] 6. These species are shown to react with tBuOK or [Bu4N]F permitting the oxidation to proceed via a process involving borane dissociation. Similarly, the equilibrium established by 1 with B(C6F4H)3 and 6 with B(C6F5)3 provides experimental support for the "Cummins mechanism" for these phosphine oxidations...
June 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29922489/physics-chemistry-and-hirshfeld-surface-analyses-of-gamma-irradiated-thalidomide-to-evaluate-behavior-under-sterilization-doses
#15
Valner A F S N Mussel, Max P Ferreira, Maria B F Marques, Maria I Yoshida, Mariana R Almeida, Bernardo L Rodrigues, Wagner N Mussel
Thalidomide was indicated as a sedative and antiemetic and prescribed for pregnant women. Its tragic teratogenic effects culminated in withdrawal from the market. Since the discovery of its anti-angiogenic and anti-inflammatory actions, thalidomide has been used in the treatment of leprosy and multiple myeloma, which justify studies of its stability. We investigated the effects of irradiation of thalidomide up to 100 kGy (fourfold the usual sterilizing dose for pharmaceutics). The β polymorph of thalidomide was obtained in an isothermal experiment at 270 °C...
June 2018: Journal of Pharmaceutical Analysis
https://www.readbyqxmd.com/read/29922482/overview-of-the-detection-methods-for-equilibrium-dissociation-constant-k-d-of-drug-receptor-interaction
#16
REVIEW
Weina Ma, Liu Yang, Langchong He
Drug-receptor interaction plays an important role in a series of biological effects, such as cell proliferation, immune response, tumor metastasis, and drug delivery. Therefore, the research on drug-receptor interaction is growing rapidly. The equilibrium dissociation constant ( K D ) is the basic parameter to evaluate the binding property of the drug-receptor. Thus, a variety of analytical methods have been established to determine the K D values, including radioligand binding assay, surface plasmon resonance method, fluorescence energy resonance transfer method, affinity chromatography, and isothermal titration calorimetry...
June 2018: Journal of Pharmaceutical Analysis
https://www.readbyqxmd.com/read/29922333/association-of-vitamin-d-receptor-bsmi-taqi-foki-and-apai-polymorphisms-with-susceptibility-of-chronic-periodontitis-a-systematic-review-and-meta-analysis-based-on-38-case-control-studies
#17
REVIEW
Fatemeh Mashhadiabbas, Hossein Neamatzadeh, Rezvan Nasiri, Elnaz Foroughi, Soudabeh Farahnak, Parisa Piroozmand, Mahta Mazaheri, Masoud Zare-Shehneh
Background: There has been increasing interest in the study of the association between Vitamin D receptor (VDR) gene polymorphisms and risk of chronic periodontitis. However, the results remain inconclusive. To better understand the roles of VDR polymorphisms (BsmI, TaqI, FokI, and ApaI) in chronic periodontitis susceptibility, we conducted this systematic review and meta-analysis. Materials and Methods: The PubMed, Google Scholar, and Web of Science database were systemically searched to determine all the eligible studies about VDR polymorphisms and risk of chronic periodontitis up to April 2017...
May 2018: Dental Research Journal
https://www.readbyqxmd.com/read/29921909/out-of-equilibrium-microcompartments-for-the-bottom-up-integration-of-metabolic-functions
#18
Thomas Beneyton, Dorothee Krafft, Claudia Bednarz, Christin Kleineberg, Christian Woelfer, Ivan Ivanov, Tanja Vidaković-Koch, Kai Sundmacher, Jean-Christophe Baret
Self-sustained metabolic pathways in microcompartments are the corner-stone for living systems. From a technological viewpoint, such pathways are a mandatory prerequisite for the reliable design of artificial cells functioning out-of-equilibrium. Here we develop a microfluidic platform for the miniaturization and analysis of metabolic pathways in man-made microcompartments formed of water-in-oil droplets. In a modular approach, we integrate in the microcompartments a nicotinamide adenine dinucleotide (NAD)-dependent enzymatic reaction and a NAD-regeneration module as a minimal metabolism...
June 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29921899/top-down-pulses-reduce-prey-population-sizes-and-persistence
#19
Elizabeth A Hamman, Michael W McCoy
Resource pulses are well documented and have important consequences for population dynamics relative to continuous inputs. However, pulses of top-down factors (e.g. predation) are less explored and appreciated in the ecological literature. Here, we use a simple differential equation population model to show how pulsed removals of individuals from a population alter population size relative to continuous dynamics. Pulsed removals result in lower equilibrium population sizes relative to continuous removals, and the differences are greatest at low population growth rates, high removal rates, and with large, infrequent pulses...
June 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29921207/role-of-bisphosphonates-in-vascular-calcification-and-bone-metabolism-a-clinical-summary
#20
Pradeep Dayanand, Harigopal Sandhyavenu, Sandeep Dayanand, Jasmin Martinez, Janani Rangaswami
Vascular calcification is known to be a strong risk factor for cardiovascular adverse events and mortality. Atherosclerosis, diabetes, aging, abnormal bone mineral homeostasis and high uremic milieu such as chronic kidney disease are major factors that contribute to the progression of vascular calcification. Several mechanisms such as the osteoblastic transition of vascular smooth muscle cells in response to oxidative stress have shed light on the active nature of vascular calcification, which was once thought to be a passive process...
June 18, 2018: Current Cardiology Reviews
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