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https://www.readbyqxmd.com/read/28922605/alkane-coiling-in-perfluoroalkane-solutions-a-new-primitive-solvophobic-effect
#1
Pedro Morgado, Ana Rosa Garcia, Luís F G Martins, Laura M Ilharco, Eduardo J M Filipe
In this work we demonstrate that n-alkanes coil when mixed with perfluoroalkanes, changing their conformational equilibria to more globular states, with a higher number of gauche conformations. The new coiling effect is here observed in fluids governed exclusively by dispersion interactions, contrarily to other examples in which hydrogen bonding and polarity play important roles. FTIR spectra of liquid mixtures of n-hexane and perfluorohexane unambiguously reveal that the population of n-hexane molecules in all-trans conformation reduces from 32% in the pure n-alkane to practically zero...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28922529/borane-stabilized-isomeric-dimers-of-the-phosphaethynolate-anion
#2
Kevin Szkop, Andrew Jupp, Riccardo Suter, Hansjorg Gruetzmacher, Douglas Wade Stephan
The reactions of the phosphaethynolate anion ([PCO]-) with a range of boranes were explored. BPh3 and [PCO]- form a dimeric anion featuring P-B bonds and is prone to dissociation at room temperature. The more Lewis acidic borane B(C6F5)3 yields a less symmetric dimer of [PCO]- with P-B and P-O bonds. Less sterically demanding HB(C6F5)2 and H2B(C6F5) boranes form a third isomer with [PCO]- with both boranes bound to the same phosphorus atom. Despite the unexpected thermodynamic preference for P-coordination, computational data illustrate that electronic and steric features impact the binding modes of the resulting dianionic dimers...
September 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28922049/magnitudes-of-muscle-activation-of-spine-stabilizers-in-healthy-adults-during-prone-on-elbow-planking-exercises-with-and-without-a-fitness-ball
#3
James W Youdas, Kendra C Coleman, Erin E Holstad, Stephanie D Long, Nicole L Veldkamp, John H Hollman
Prone planking exercises have been used by rehabilitation professionals to activate torso muscles in healthy persons and those with low back pain. The aim of this study was to compare the magnitude of electromyographic (EMG) muscle activation from 10 right-sided muscles as demonstrated by the percentage of maximum voluntary isometric contraction (%MVIC) during four planking procedures. Surface EMG activity was acquired from the following muscles: (1) iliocostalis lumborum (IL), (2) longissimus thoracis (LT), (3) lumbar multifidus (LM), (4) rectus abdominis (RA), (5) external oblique (EO), (6) internal oblique (IO), (7) serratus anterior (SA), (8) latissimus dorsi (LD), (9) hamstrings (HS), and (10) gluteus maximus (GM)...
September 18, 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28921906/outcomes-of-severe-uveitic-glaucoma-treated-with-baerveldt-implant-can-blindness-be-prevented
#4
Annelie N Tan, Michiel F Cornelissen, Carroll A B Webers, Roel J Erckens, Tos T J M Berendschot, Henny J M Beckers
PURPOSE: To evaluate long-term outcomes on efficacy and safety of severe uveitic glaucoma treated with a Baerveldt glaucoma implant (BGI). METHODS: A retrospective study of 47 eyes of 47 patients with uveitic glaucoma treated by a BGI between September 2002 and September 2015. Main outcome measures were intraocular pressure (IOP), number of glaucoma medications, course of the uveitis, visual acuity (VA) and complications. RESULTS: Mean IOP dropped from 30...
September 18, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28921828/hdl-c-apoa-i-a-multi-vessel-cardiometabolic-risk-marker-in-women-with-t2dm
#5
Michel P Hermans, Paul Valensi, Sylvie A Ahn, Michel F Rousseau
AIMS: Although women have higher HDL-C than men, their HDL particles are also prone to become small, dense and dysfunctional in case of T2DM. To assess the vascular risk related to HDLs of different sizes/densities without direct measurement, we adjusted HDL-C to its main apolipoprotein (apoA-I), as [HDL-C/apoA-I]. This ratio estimates HDLs size and provides indices as to their number, cholesterol load, and density. METHODS: We stratified 280 Caucasian T2DM women according to [HDL-C/apoA-I] quartiles (Q), to determine how it segregates cardiometabolic risk, β-cell function, glycemic control, and vascular complications...
September 15, 2017: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/28921765/assessing-fire-impacts-on-the-carbon-stability-of-fire-tolerant-forests
#6
Lauren T Bennett, Matthew J Bruce, Josephine Machunter, Michele Kohout, Saravanan Jangammanaidu Krishnaraj, Cristina Aponte
The carbon stability of fire-tolerant forests is often assumed but less frequently assessed, limiting potential to anticipate threats to forest carbon posed by predicted increases in forest fire activity. Assessing the carbon stability of fire-tolerant forests requires multi-indicator approaches that recognise the myriad of ways that fires influence the carbon balance including combustion, deposition of pyrogenic material, and tree death, post-fire decomposition, recruitment, and growth. Five years after a large-scale wildfire in south-eastern Australia, we assessed the impacts of low- and high-severity wildfire, with and without prescribed fire (≤ 10 years before), on carbon stocks in multiple pools, and on carbon stability indicators (carbon stock percentages in live trees and in small trees, and carbon stocks in char and fuels) in fire-tolerant eucalypt forests...
September 16, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28921462/bifidobacterium-pseudocatenulatum-cect-7765-ameliorates-neuroendocrine-alterations-associated-with-an-exaggerated-stress-response-and-anhedonia-in-obese-mice
#7
Ana Agusti, A Moya-Pérez, I Campillo, S Montserrat-de la Paz, V Cerrudo, A Perez-Villalba, Yolanda Sanz
Obesity, besides being a problem of metabolic dysfunction, constitutes a risk factor for psychological disorders. Experimental models of diet-induced obesity have revealed that obese animals are prone to anxious and depressive-like behaviors. The present study aimed to evaluate whether Bifidobacterium pseudocatenulatum CECT 7765 could reverse the neurobehavioral consequences of obesity in a high-fat diet (HFD) fed mouse model via regulation of the gut-brain axis. Adult male wild-type C57BL-6 mice were fed a standard diet or HFD, supplemented with either placebo or the bifidobacterial strain for 13 weeks...
September 18, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28921417/bacteriocinogenic-lab-strains-for-fermented-meat-preservation-perspectives-challenges-and-limitations
#8
Lorenzo Favaro, Svetoslav Dimitrov Todorov
Over the last decades, much research has focused on lactic acid bacteria (LAB) bacteriocins because of their potential as biopreservatives and their action against the growth of spoilage microbes. Meat and fermented meat products are prone to microbial contamination, causing health risks, as well as economic losses in the meat industry. The use of bacteriocin-producing LAB starter or protective cultures is suitable for fermented meats. However, although bacteriocins can be produced during meat processing, their levels are usually much lower than those achieved during in vitro fermentations under optimal environmental conditions...
September 18, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28920598/interaction-between-h2o-n2-co-no-no2-and-n2o-molecules-and-a-defective-wse2-monolayer
#9
Dongwei Ma, Benyuan Ma, Zhiwen Lu, Chaozheng He, Yanan Tang, Zhansheng Lu, Zongxian Yang
In this study, the interaction between gas molecules, including H2O, N2, CO, NO, NO2 and N2O, and a WSe2 monolayer containing an Se vacancy (denoted as VSe) has been theoretically studied. Theoretical results show that H2O and N2 molecules are highly prone to be physisorbed on the VSe surface. The presence of the Se vacancy can significantly enhance the sensing ability of the WSe2 monolayer toward H2O and N2 molecules. In contrast, CO and NO molecules highly prefer to be molecularly chemisorbed on the VSe surface with the non-oxygen atom occupying the Se vacancy site...
September 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28920568/pregnant-women-of-south-asian-ethnicity-in-canada-have-substantially-lower-vitamin-b12-status-compared-with-pregnant-women-of-european-ethnicity
#10
Theresa H Schroder, Graham Sinclair, Andre Mattman, Benjamin Jung, Susan I Barr, Hilary D Vallance, Yvonne Lamers
Maternal vitamin B12 (B12) status has been inversely associated with adverse pregnancy outcomes and positively with fetal growth and infant development. South Asians, Canada's largest ethnic minority, are prone to B12 deficiency. Yet, data are lacking on B12 status in South Asian pregnant women in North America. We sought to determine B12 status, using multiple biomarkers, in 1st and 2nd trimester pregnant women of South Asian and, for comparison, European ethnicity living in Vancouver, Canada. In this retrospective cohort study, total B12, holotranscobalamin (holoTC), methylmalonic acid (MMA), and total homocysteine concentrations were quantified in two routinely collected (mean gestational week: 11·5 (range 8·3-13·9) and 16·5 (range 14·9-20·9)), banked serum samples of 748 healthy pregnant South Asian (n 371) and European (n 377) women...
September 18, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28920008/seven-year-course-of-borderline-personality-disorder-features-borderline-pathology-is-as-unstable-as-depression-during-adolescence
#11
Christopher C Conway, Alison E Hipwell, Stephanie D Stepp
Borderline personality disorder (PD) historically is construed as an unremitting condition with poor prognosis. The present study takes a new approach to examining stability and change in borderline PD by explaining symptom expression in terms of an unchanging foundation-termed borderline proneness-on one hand, and transitory influences on the other. We monitored borderline PD symptoms annually in a large sample of high-risk adolescent girls (N = 2,450) from ages 14 to 20. Trait-state-occasion modeling revealed that just over half (52-57%) of borderline PD symptom variation was attributable to fixed borderline proneness, whereas the remainder was subject to change across yearly measurement occasions...
July 2017: Clinical Psychological Science
https://www.readbyqxmd.com/read/28919758/a-case-of-schizophrenia-comorbid-for-tetralogy-of-fallot-treated-with-clozapine-further-considerations-on-a-role-for-22q-11-2-in-the-proneness-for-seizures
#12
Hiroko Kashiwagi, Satoru Ikezawa, Tomiki Sumiyoshi, Atsuko Kadono, Kazuhiko Segawa, Kazuyoshi Takeda, Mayu Omori, Hisako Taguchi, Naotsugu Hirabayashi
We present a case of schizophrenia comorbid for tetralogy of Fallot, without chromosome 22q.11.2 deletion or duplication, treated successfully with a combination of clozapine and antiepileptic drugs. Although clozapine by itself initially triggered convulsive seizures, we continued it with co-administration of valproate and topiramate. This combined treatment did not affect cardiac function of the patient, who experienced a favorable clinical course in terms of symptomatology and functional outcomes. To our knowledge, we provide the first report on a patient with tetralogy of Fallot, in whom 22q...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28919507/tissue-engineered-magnetic-cell-sheet-patches-for-advanced-strategies-in-tendon-regeneration
#13
Ana I Gonçalves, Márcia T Rodrigues, Manuela E Gomes
Tendons are powerful 3D biomechanically structures combining a few cells in an intrincated and highly hierarchical niche environment. When tendon homeostasis is compromised, restoration of functionality upon injury is limited and requires alternatives to current augmentation or replacement strategies. Cell sheet technologies are a powerful tool for the fabrication of living extracellular-rich patches towards regeneration of tenotopic defects. Thus, we originally propose the development of magnetically responsive tenogenic patches through magnetic cell sheet (magCSs) technology that enable the remote control upon implantation of the tendon-mimicking constructs...
September 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28919206/pluripotency-surveillance-by-myc-driven-competitive-elimination-of-differentiating-cells
#14
Covadonga Díaz-Díaz, Laura Fernandez de Manuel, Daniel Jimenez-Carretero, María Concepción Montoya, Cristina Clavería, Miguel Torres
The mammalian epiblast is formed by pluripotent cells able to differentiate into all tissues of the new individual. In their progression to differentiation, epiblast cells and their in vitro counterparts, embryonic stem cells (ESCs), transit from naive pluripotency through a differentiation-primed pluripotent state. During these events, epiblast cells and ESCs are prone to death, driven by competition between Myc-high cells (winners) and Myc-low cells (losers). Using live tracking of Myc levels, we show that Myc-high ESCs approach the naive pluripotency state, whereas Myc-low ESCs are closer to the differentiation-primed state...
September 9, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28918385/wall-enhancement-ratio-and-partial-wall-enhancement-on-mri-associated-with-the-rupture-of-intracranial-aneurysms
#15
Guang-Xian Wang, Li Wen, Sheng Lei, Qian Ran, Jin-Bo Yin, Zi-Li Gong, Dong Zhang
OBJECTIVES: To evaluate the risk factors for rupture of intracranial aneurysms (IAs) using high resolution MRI (HRMRI). METHODS: 91 consecutive patients with 106 IAs were reviewed from February 2016 to April 2017. Patients and IAs were divided into ruptured and unruptured groups. In addition to the clinical characteristics of the patients, the features of IAs (eg, shape) were evaluated by CT angiography, whereas wall thickness, enhanced patterns, and enhancement ratio (ER) were evaluated by MRI...
September 16, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28918109/precision-based-guidelines-for-sub-maximal-normalisation-task-selection-for-trunk-extensor-emg
#16
Jennie A Jackson, Svend Erik Mathiassen, Jack P Callaghan, Patrick G Dempsey
AIM: The object of this study was to quantify the contribution of sub-maximal normalisation to the overall variance of exposure parameters describing erector spinae (ES) activity, and to provide guidelines for task selection which minimize methodological variance. METHODS: ES EMG was measured from three locations (T9, L1 and L5 levels) on fifteen men performing a manual materials handling task in the laboratory on three separate days. Four repeats of each of eleven sub-maximal normalisation tasks (eight static, three dynamic) were collected, work data were normalised to each task and repeat, and exposure parameters calculated...
July 20, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28917992/securing-extraocular-muscles-in-strabismus-surgery-biomechanical-analysis-of-knot-tying-technique
#17
Steven E Brooks
BACKGROUND: The safe and precise reattachment of extraocular muscles requires a technical approach that minimizes any opportunity for the muscle to slip intraoperatively or postoperatively while minimizing surgical risk. Biomechanical testing can provide important quantitative information about the tensile properties of different knot configurations that may inform surgical technique. METHODS: A precision digital force gauge was used to assess the tensile strength created by different knot tying techniques and configurations in human sclera using 6-0 polyglactin 910 suture...
September 13, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28917699/the-impact-of-aging-on-subregions-of-the-hippocampal-complex-in-healthy-adults
#18
Florian Kurth, Nicolas Cherbuin, Eileen Luders
The hippocampal complex, an anatomical composite of several subregions, is known to decrease in size with increasing age. However, studies investigating which subregions are particularly prone to age-related tissue loss revealed conflicting findings. Possible reasons for such inconsistencies may reflect differences between studies in terms of the cohorts examined or techniques applied to define and measure hippocampal subregions. In the present study, we enhanced conventional MR-based information with microscopically defined cytoarchitectonic probabilities to investigate aging effects on the hippocampal complex in a carefully selected sample of 96 healthy subjects (48 males/48 females) aged 18-69 years...
September 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28917499/association-of-sleep-with-sudden-unexpected-death-in-epilepsy
#19
REVIEW
Ahmer Ali, Shasha Wu, Naoum P Issa, Sandra Rose, Vernon L Towle, Peter Warnke, James X Tao
OBJECTIVE: The objective of this study was to determine the association of sleep with sudden unexpected death in epilepsy (SUDEP). METHODS: We conducted a systematic review and meta-analysis based on literature search from databases PubMed, Web of Science, and Scopus using keywords "SUDEP", or "sudden unexpected death in epilepsy", or "sudden unexplained death in epilepsy". Sudden unexpected death in epilepsy was considered to occur during sleep if the patient was found in bed, if the SUDEP cases were documented as in sleep, or if the patient was found at bedside on the bedroom floor...
September 13, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28917147/combined-in-silico-approaches-for-the-identification-of-novel-inhibitors-of-human-islet-amyloid-polypeptide-hiapp-fibrillation
#20
Palak Patel, Krupali Parmar, Vivek K Vyas, Dhaval Patel, Mili Das
Human islet amyloid polypeptide (hIAPP) is a natively unfolded polypeptide hormone of glucose metabolism, which is co-secreted with insulin by the β-cells of the pancreas. In patients with type 2 diabetes, IAPP forms amyloid fibrils because of diabetes-associated β-cells dysfunction and increasing fibrillation, in turn, lead to failure of secretory function of β-cells. This provides a target for the discovery of small organic molecules against protein aggregation diseases. However, the binding mechanism of these molecules with monomers, oligomers and fibrils to inhibit fibrillation is still an open question...
September 6, 2017: Journal of Molecular Graphics & Modelling
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