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https://www.readbyqxmd.com/read/28944810/microfluidic-step-emulsification-in-axisymmetric-geometry
#1
I Chakraborty, J Ricouvier, P Yazhgur, P Tabeling, A M Leshansky
Biphasic step-emulsification (Z. Li et al., Lab Chip, 2015, 15, 1023) is a promising microfluidic technique for high-throughput production of μm and sub-μm highly monodisperse droplets. The step-emulsifier consists of a shallow (Hele-Shaw) microchannel operating with two co-flowing immiscible liquids and an abrupt expansion (i.e., step) to a deep and wide reservoir. Under certain conditions the confined stream of the disperse phase, engulfed by the co-flowing continuous phase, breaks into small highly monodisperse droplets at the step...
September 25, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28944611/gene-therapy-with-the-trf1-telomere-gene-rescues-decreased-trf1-levels-with-aging-and-prolongs-mouse-health-span
#2
Aksinya Derevyanko, Kurt Whittemore, Ralph P Schneider, Verónica Jiménez, Fàtima Bosch, Maria A Blasco
The shelterin complex protects telomeres by preventing them from being degraded and recognized as double-strand DNA breaks. TRF1 is an essential component of shelterin, with important roles in telomere protection and telomere replication. We previously showed that TRF1 deficiency in the context of different mouse tissues leads to loss of tissue homeostasis owing to impaired stem cell function. Here, we show that TRF1 levels decrease during organismal aging both in mice and in humans. We further show that increasing TRF1 expression in both adult (1-year-old) and old (2-year-old) mice using gene therapy can delay age-associated pathologies...
September 24, 2017: Aging Cell
https://www.readbyqxmd.com/read/28944539/nanofibrous-scaffolds-with-biomimetic-structure
#3
Shahla Khalili, Saied Nouri Khorasani, Mohammad Razavi, Batol Hashemi Beni, Fariba Heydari, Ali Tamayol
This research studies the effect of using a grid-like pattern as a collector on increasing the pore size of the electrospun gelatin/cellulose acetate/elastin scaffolds. The morphological study showed an enlargement in pore size and a decline in fiber diameter in comparison with the scaffold fabricated using conventional flat sheet collectors. The use of the pattern increased the swelling ratio and degradation rate of the scaffold. Investigating the tensile properties of scaffolds revealed that the patterned collector increased the elongation at break up to 145%...
September 25, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28944390/a-topological-study-of-chemical-bonds-under-pressure-solid-hydrogen-as-a-model-case
#4
Vanessa Riffet, Vanessa Labet, Julia Contreras-García
It is now well recognized that a fundamental understanding of the rules that govern chemistry under pressure is still lacking. Hydrogen being the "simplest" element as well as a central core to high pressure physics, we undertake a general study of the changes in the chemical bonding under pressure. We start from a simple trimer unit that has been found in high pressure phases, whose behavior has been found to reveal the basics of hydrogen polymerization under pressure. Making use of bond analysis tools, mainly the NCI (noncovalent interactions) index, we show that polymerization takes place in three steps: dipolar attraction, repulsion and bond formation...
September 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28944309/particle-coatings-but-not-silver-ions-mediate-genotoxicity-of-ingested-silver-nanoparticles-in-a-mouse-model
#5
Sameera Nallanthighal, Cadia Chan, Dhruba J Bharali, Shaker A Mousa, Elizabeth Vásquez, Ramune Reliene
Incorporation of silver nanoparticles (AgNPs) in toothpaste, food containers, dietary supplements and other consumer products can result in oral exposure to AgNPs and/or silver ions (Ag(+)) released from the surface of AgNPs. To examine whether ingestion of AgNPs or Ag(+) results in genotoxic damage and whether AgNP coatings modulate the effect, we exposed mice orally to 20 nm citrate-coated AgNPs, polyvinylpyrrolidone (PVP)-coated AgNPs, silver acetate or respective vehicles at a 4 mg/kg dose (equivalent to 800x the EPA reference dose for Ag) for 7 days...
January 2017: NanoImpact
https://www.readbyqxmd.com/read/28944288/the-wisdom-study-breaking-the-deadlock-in-the-breast-cancer-screening-debate
#6
REVIEW
Laura J Esserman
There are few medical issues that have generated as much controversy as screening for breast cancer. In science, controversy often stimulates innovation; however, the intensely divisive debate over mammographic screening has had the opposite effect and has stifled progress. The same two questions-whether it is better to screen annually or bi-annually, and whether women are best served by beginning screening at 40 or some later age-have been debated for 20 years, based on data generated three to four decades ago...
2017: NPJ Breast Cancer
https://www.readbyqxmd.com/read/28944274/time-motion-analysis-as-a-novel-approach-for-evaluating-the-impact-of-environmental-heat-exposure-on-labor-loss-in-agriculture-workers
#7
Leonidas G Ioannou, Lydia Tsoutsoubi, George Samoutis, Lucka Kajfez Bogataj, Glen P Kenny, Lars Nybo, Tord Kjellstrom, Andreas D Flouris
Introduction: In this study we (i) introduced time-motion analysis for assessing the impact of workplace heat on the work shift time spent doing labor (WTL) of grape-picking workers, (ii) examined whether seasonal environmental differences can influence their WTL, and (iii) investigated whether their WTL can be assessed by monitoring productivity or the vineyard manager's estimate of WTL. Methods: Seven grape-picking workers were assessed during the summer and/or autumn via video throughout four work shifts...
2017: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/28944208/visual-efficiency-among-teenaged-athletes-and-non-athletes
#8
Rokiah Omar, Yau Meng Kuan, Nurul Atikah Zuhairi, Faudziah Abd Manan, Victor Feizal Knight
AIM: To compare visual efficiency, specifically accom-modation, vergence, and oculomotor functions among athletes and non-athletes. METHODS: A cross-sectional study on sports vision screening was used to evaluate the visual skills of 214 elementary students (107 athletes, 107 non-athletes), aged between 13 and 16y. The visual screening assessed visual parameters such as ocular motor alignment, accommodation, and vergence functions. RESULTS: Mean visual parameters were compared between age-group matched athletes (mean age 14...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28944026/tree-seed-traits-response-to-monsoon-climate-and-altitude-in-indian-subcontinent-with-particular-reference-to-the-himalayas
#9
Surendra P Singh, Shyam S Phartyal, Sergey Rosbakh
Seed traits are related to several ecological attributes of a plant species, including its distribution. While the storage physiology of desiccation-sensitive seeds has drawn considerable attention, their ecology has remained sidelined, particularly how the strong seasonality of precipitation in monsoonal climate affects their temporal and spatial distribution. We compiled data on seed mass, seed desiccation behavior, seed shedding, and germination periodicity in relation to monsoon and altitude for 198 native tree species of Indian Himalayas and adjoining plains to find out (1) the adaptive significance of seed mass and seed desiccation behavior in relation to monsoon and (2) the pattern of change in seed mass in relation to altitude, habitat moisture, and succession...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28943823/population-pharmacokinetics-and-pharmacodynamic-target-attainment-of-meropenem-in-critically-ill-young-children
#10
Jeffrey J Cies, Wayne S Moore, Adela Enache, Arun Chopra
OBJECTIVE: This study aims to describe the population pharmacokinetics and pharmacodynamic target attainment of meropenem in critically ill children. METHODS: The study involved a retrospective medical record review from a 189-bed, freestanding children's tertiary care teaching hospital of patients ages 1 to 9 years who received meropenem with concurrent therapeutic drug monitoring. RESULTS: There were 9 patients ages 1 to 9 years (mean age, 3...
July 2017: Journal of Pediatric Pharmacology and Therapeutics: JPPT: the Official Journal of PPAG
https://www.readbyqxmd.com/read/28943796/higgs-pair-production-in-vector-boson-fusion-at-the-lhc-and-beyond
#11
Fady Bishara, Roberto Contino, Juan Rojo
The production of pairs of Higgs bosons at hadron colliders provides unique information on the Higgs sector and on the mechanism underlying electroweak symmetry breaking (EWSB). Most studies have concentrated on the gluon-fusion production mode which has the largest cross section. However, despite its small production rate, the vector-boson fusion channel can also be relevant since even small modifications of the Higgs couplings to vector bosons induce a striking increase of the cross section as a function of the invariant mass of the Higgs boson pair...
2017: European Physical Journal. C, Particles and Fields
https://www.readbyqxmd.com/read/28943787/improved-determination-of-the-higgs-mass-in-the-mssm-with-heavy-superpartners
#12
Emanuele Bagnaschi, Javier Pardo Vega, Pietro Slavich
We present several advances in the effective field theory calculation of the Higgs mass in MSSM scenarios with heavy superparticles. In particular, we compute the dominant two-loop threshold corrections to the quartic Higgs coupling for generic values of the relevant SUSY-breaking parameters, including all contributions controlled by the strong gauge coupling and by the third-family Yukawa couplings. We also study the effects of a representative subset of dimension-six operators in the effective theory valid below the SUSY scale...
2017: European Physical Journal. C, Particles and Fields
https://www.readbyqxmd.com/read/28943783/light-and-compressed-gluinos-at-the-lhc-via-string-theory
#13
S S AbdusSalam
In this article, we show that making global fits of string theory model parameters to data is an interesting mechanism for probing, mapping and forecasting connections of the theory to real world physics. We considered a large volume scenario (LVS) with D3-brane matter fields and supersymmetry breaking. A global fit of the parameters to low-energy data shows that the set of LVS models are associated with light gluinos which are quasi-degenerate with the neutralinos and charginos they can promptly decay into, and thus they are possibly hidden to current LHC gluino search strategies...
2017: European Physical Journal. C, Particles and Fields
https://www.readbyqxmd.com/read/28943598/the-piezo-actuator-driven-pulsed-water-jet-system-for-minimizing-renal-damage-after-off-clamp-laparoscopic-partial-nephrectomy
#14
Yoshihiro Kamiyama, Shinichi Yamashita, Atsuhiro Nakagawa, Shinji Fujii, Koji Mitsuzuka, Yasuhiro Kaiho, Akihiro Ito, Takaaki Abe, Teiji Tominaga, Yoichi Arai
In the setting of partial nephrectomy (PN) for renal cell carcinoma, postoperative renal dysfunction might be caused by surgical procedure. The aim of this study was to clarify the technical safety and renal damage after off-clamp laparoscopic PN (LPN) with a piezo actuator-driven pulsed water jet (ADPJ) system. Eight swine underwent off-clamp LPN with this surgical device, while off-clamp open PN was also performed with radio knife or soft coagulation. The length of the removed kidney was 40 mm, and the renal parenchyma was dissected until the renal calyx became clearly visible...
2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28943391/cytogenetic-effects-of-jacareubin-from-calophyllum-brasiliense-on-human-peripheral-blood-mononucleated-cells-in-vitro-and-on-mouse-polychromatic-erythrocytes-in-vivo
#15
W R García-Niño, E Estrada-Muñiz, M Valverde, R Reyes-Chilpa, L Vega
Jacareubin is a xanthone isolated from the heartwood of Calophyllum brasiliense with antibacterial and gastroprotective properties and the intention for clinical use as an anti-cancer treatment (due to the similar chemical structure to other anti-neoplastic drugs) requires an investigation of whether this compound can generate adverse effects on non-transformed cells. Jacareubin (0.5-1000μM in DMSO) was more cytotoxic on phytohemagglutinin (PHA)-stimulated normal human peripheral blood mononuclear cells (PBMCs; IC50 at 72h by MTT: 85...
September 21, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28943310/asf1a-promotes-non-homologous-end-joining-repair-by-facilitating-phosphorylation-of-mdc1-by-atm-at-double-strand-breaks
#16
Kyung Yong Lee, Jun-Sub Im, Etsuko Shibata, Anindya Dutta
Double-strand breaks (DSBs) of DNA in eukaryotic cells are predominantly repaired by non-homologous end joining (NHEJ). The histone chaperone anti-silencing factor 1a (ASF1a) interacts with MDC1 and is recruited to sites of DSBs to facilitate the interaction of phospho-ATM with MDC1 and phosphorylation of MDC1, which are required for the recruitment of RNF8/RNF168 histone ubiquitin ligases. Thus, ASF1a deficiency reduces histone ubiquitination at DSBs, decreasing the recruitment of 53BP1, and decreases NHEJ, rendering cells more sensitive to DSBs...
September 13, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28943150/screening-and-identification-of-lignin-degrading-bacteria-in-termite-gut-and-the-construction-of-lip-expressing-recombinant-lactococcus-lactis
#17
Haizhu Zhou, Wei Guo, Bo Xu, Zhanwei Teng, Dapeng Tao, Yujie Lou, Yunhang Gao
Lignin, a common natural polymers, is abundant and complex, and termites can break down and utilize the lignin in their food. In this study an attempt was made to isolate and characterize the lignolytic bacteria from termite (Reticulitermes chinensis Snyder) gut. Two strains (PY12 and MX5) with high lignin peroxidase (LiP) activity were screened using the azure B method. By analyzing their 16S rRNA, the strain PY12 was classified as Enterobacter hormaechei; MX5, as Bacillus licheniformis. We then optimized the different conditions of liquid fermentation medium, and obtained LiP activities of 278 U/L and 256 U/L for PY12 and MX5, respectively...
September 21, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28943019/-outlier-patient-admissions-and-their-relationship-with-the-emergence-of-clinical-complications-and-prolonged-hospital-stays
#18
Enrique Cabrera Torres, María Aránzazu García Iglesias, María Teresa Santos Jiménez, Miguel González Hierro, María Luisa Diego Domínguez
OBJECTIVE: To analyze the relationship between the type of hospital admission (outlier and non-outlier admissions) and the appearance of clinical complications and the average stay. METHODS: From a retrospective epidemiological study of a cohort of patients admitted to the Hospital Complejo Asistencial Universitario de Salamanca (Salamanca, Spain) over a six-month period, outlier and non-outlier patients were identified. This project had access to the admissions department database, the hospital's CMBD (in Spanish, Conjunto Mínimo Básico de Datos) for hospitalisation, the AP-DRG (All Patient-Diagnosis Related Groups) and ALCOR (a clinical-statistics analytics tool)...
September 21, 2017: Gaceta Sanitaria
https://www.readbyqxmd.com/read/28943018/tear-lipid-supplement-prophylaxis-against-dry-eye-in-adverse-environments
#19
Akilesh Gokul, Michael T M Wang, Jennifer P Craig
PURPOSE: To compare the prophylactic efficacy of single application of lipid and non-lipid containing tear supplements, prior to exposure of symptomatic dry eye subjects to a simulated adverse environment. METHODS: Thirty subjects with mild-to-moderate dry eye symptoms participated in the prospective, randomised, double-masked, paired-eye trial. A lipomimetic drop (Systane(®) Balance) was applied to one eye (randomised), and a non-lipid containing drop (Systane(®) Ultra) applied simultaneously to the contralateral eye...
September 21, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28942648/dynamics-of-disulfide-bond-disruption-and-formation-in-the-thermal-unfolding-of-ribonuclease-a
#20
Pawel Krupa, Adam K Sieradzan, Magdalena Anna Mozolewska, Huiyu Li, Adam Liwo, Harold Abraham Scheraga
Ribonuclease A (RNase A) is the most studied member of ribonucleases - a group of enzymes responsible for catalyzing RNA degradation. RNase A contains four disulfide bonds, which were found to be necessary for the native structure of the protein to form. In this work the kinetics and thermodynamics of RNase unfolding was studied by means of a series of coarse-grained canonical molecular-dynamics simulations, run at various temperatures, and replica-exchange molecular dynamics simulations with the UNRES force field, which is capable of dynamic formation and breaking the disulfide bonds during the course of the simulations...
September 25, 2017: Journal of Chemical Theory and Computation
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