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https://www.readbyqxmd.com/read/28212490/vitamin-e-succinate-grafted-chitosan-oligosaccharide-rgd-conjugated-tpgs-mixed-micelles-loaded-with-paclitaxel-for-u87mg-tumor-therapy
#1
Yanzuo Chen, Shu Feng, Wenchao Liu, Zeting Yuan, Peihao Yin, Feng Gao
The poor therapeutic efficacy of hydrophobic chemotherapeutic drugs is an intrinsic limitation to successful chemotherapy. In the present study, a multi-task delivery system based on arginine-glycine-aspartic acid peptide (RGD) decorated vitamin E succinate (VES)-grafted-chitosan oligosaccharide (CSO)/RGD-conjugated D-alpha-tocopheryl polyethylene glycol 1000 succinate (TPGS-RGD) mixed micelles (VeC/T-RGD MM) was first prepared for targeted delivery of paclitaxel (PTX), a hydrophobic anticancer drug, to improve the efficacy of U87MG tumor therapy...
February 17, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28212440/emergent-inequality-and-self-organized-social-classes-in-a-network-of-power-and-frustration
#2
Benoit Mahault, Avadh Saxena, Cristiano Nisoli
We propose a simple agent-based model on a network to conceptualize the allocation of limited wealth among more abundant expectations at the interplay of power, frustration, and initiative. Concepts imported from the statistical physics of frustrated systems in and out of equilibrium allow us to compare subjective measures of frustration and satisfaction to collective measures of fairness in wealth distribution, such as the Lorenz curve and the Gini index. We find that a completely libertarian, law-of-the-jungle setting, where every agent can acquire wealth from or lose wealth to anybody else invariably leads to a complete polarization of the distribution of wealth vs...
2017: PloS One
https://www.readbyqxmd.com/read/28212384/global-economic-impacts-of-climate-variability-and-change-during-the-20th-century
#3
Francisco Estrada, Richard S J Tol, Wouter J W Botzen
Estimates of the global economic impacts of observed climate change during the 20th century obtained by applying five impact functions of different integrated assessment models (IAMs) are separated into their main natural and anthropogenic components. The estimates of the costs that can be attributed to natural variability factors and to the anthropogenic intervention with the climate system in general tend to show that: 1) during the first half of the century, the amplitude of the impacts associated with natural variability is considerably larger than that produced by anthropogenic factors and the effects of natural variability fluctuated between being negative and positive...
2017: PloS One
https://www.readbyqxmd.com/read/28212259/robotic-rectal-resection-with-a-single-docking-technique-thanks-to-the-rotation-of-the-r3-arm
#4
Benedetta Pesi, Mario Annecchiarico, Stefano Amore Bonapasta, Alessandro Nerini, Federico Perna, Lapo Bencini, Michele Di Marino, Andrea Coratti
BACKGROUND: Robotic surgery for rectal resection presents some advantages compared with the traditional technique; however, it also presents some limitations, especially due to the multiple changes of surgical fields. We describe a new technique to perform low-anterior resection using single docking with the rotation of the third arm and our perioperative results. MATERIALS AND METHODS: A total of 31 patients who underwent low-anterior rectal robotic resection with single-docking technique using robotic daVinci SI (Surgical Intuitive System) were included in the study...
February 16, 2017: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/28212219/drug-infusion-systems-technologies-performance-and-pitfalls
#5
Uoo R Kim, Robert A Peterfreund, Mark A Lovich
This review aims to broadly describe drug infusion technologies and raise subtle but important issues arising from infusion therapy that can potentially lead to patient instability and morbidity. Advantages and disadvantages of gravity-dependent drug infusion are described and compared with electromechanical approaches for precise control of medication infusion, including large-volume peristaltic and syringe pumps. This review discusses how drugs and inert carriers interact within infusion systems and outlines several complexities and potential sources of drug error...
February 16, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28212182/what-s-new-in-obstetric-anesthesia-the-2016-gerard-w-ostheimer-lecture
#6
Philip E Hess
This special article presents potentially important trends and issues affecting the field of obstetric anesthesia drawn from publications in 2015. Both maternal mortality and morbidity in the United States have increased in recent years because, in part, of the changing demographics of the childbearing population. Pregnant women are older and have more pre-existing conditions and complex medical histories. Cardiovascular and noncardiovascular medical diseases now account for half of maternal deaths in the United States...
March 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28212159/liver-allocation-and-distribution-time-for-a-change
#7
Ranjit Deshpande, Ryutaro Hirose, David Mulligan
PURPOSE OF REVIEW: Liver allograft allocation has been a topic of hot debate for over a decade. New redistricting changes have been proposed by the Liver and Intestinal Transplant Committee to the existing United Network for Organ Sharing (UNOS) liver allocation policy. The basis of this new proposal is similar to the old one with an aim to distribute organs in a fair, efficient and equitable fashion. In this review, we plan to look in depth at the redistribution proposals thus far, their merits and how they may help patients who do not have adequate access to livers...
February 15, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28212150/desensitization-strategies-in-the-patient-awaiting-heart-transplantation
#8
David H Chang, Jon A Kobashigawa
PURPOSE OF REVIEW: The aim of this review is to discuss the impact of antibody sensitization on heart transplant recipients. RECENT FINDINGS: We will discuss the current state of antibody identification, antibody strength and potential antibody pathogenicity. The prevalence of antibody sensitization has increased with increased utilization of mechanical circulatory support (MCS). Data on MCS-related antibody sensitization are reviewed. Important considerations to minimize the prozone effect in antibody testing will be discussed...
February 15, 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/28212039/in-vitro-stepwise-reconstitution-of-amino-acid-derived-vinyl-isocyanide-biosynthesis-detection-of-an-elusive-intermediate
#9
Wei-Chen Chang, Dev Sanyal, Jhih-Liang Huang, Kuljira Ittiamornkul, Qin Zhu, Xinyu Liu
In vitro reconstitution of a newly discovered isonitrile synthase (AmbI1 and AmbI2) and the detection of an elusive intermediate (S)-3-(1H-indol-3-yl)-2-isocyanopropanoic acid 1 in indolyl vinyl isocyanide biogenesis are reported. The characterization of iron/2-oxoglutarate (Fe/2OG) dependent desaturases IsnB and AmbI3 sheds light on the possible mechanism underlying stereoselective alkene installation to complete the biosynthesis of (E)- and (Z)-3-(2-isocyanovinyl)-1H-indole 2 and 5. Establishment of a tractable isonitrile synthase system (AmbI1 and AmbI2) paves the way to elucidate the enigmatic enzyme mechanism for isocyanide formation...
February 17, 2017: Organic Letters
https://www.readbyqxmd.com/read/28212033/surface-induced-changes-in-the-thermochromic-transformation-of-an-ionic-liquid-cobalt-thiocyanate-complex
#10
Benjamin May, Michael Hönle, Bettina Heller, Francesco Greco, Radha Gobinda Bhuin, Hans-Peter Steinrück, Florian Maier
We demonstrate that a thermodynamic complex equilibrium within an ionic liquid film can be significantly influenced by the presence of the liquid-vacuum interface. Using surface sensitive X-ray photoelectron spectroscopy, we find that the temperature-driven transition from the blue-colored tetrahedral [Co(II)(NCS)4](2-) to the red-colored octahedral [Co(II)(NCS)6](4-) complex occurs within the outermost nanometers already around +4 °C as compared to -25 °C in the bulk. This thermochromic transformation in the near-surface region goes along with a loss in preferential surface orientation of free [SCN](-) anions and with a pronounced decrease in the complex density; both effects are attributed to the formation of a weakly-bound solvation shell around the [Co(II)(NCS)6](4-) anion leading to an effective complex dilution...
February 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28211968/verse-guided-parallel-rf-excitations-using-dynamic-field-correction
#11
Mustafa Çavuşoğlu, Ronald Mooiweer, Klaas P Pruessmann, Shaihan J Malik
In parallel RF pulse design, peak RF magnitudes and specific absorption rate levels are critical concerns in the hardware and safety limits. The variable rate selective excitation (VERSE) method is an efficient technique to limit the peak RF power by applying a local-only RF and gradient waveform reshaping while retaining the on-resonance profile. The accuracy of the excitation performed by the VERSEd RF and gradient waveforms strictly depends on the performance of the employed hardware. Any deviation from the nominal gradient fields as a result of frequency dependent system imperfections violates the VERSE condition similarly to off-resonance effects, leading to significant excitation errors and the RF pulse not converging to the targeted peak RF power...
February 17, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28211918/myotonic-dystrophy-type-1-patient-derived-ipscs-for-the-investigation-of-ctg-repeat-instability
#12
Junko Ueki, Masayuki Nakamori, Masahiro Nakamura, Misato Nishikawa, Yoshinori Yoshida, Azusa Tanaka, Asuka Morizane, Masayoshi Kamon, Toshiyuki Araki, Masanori P Takahashi, Akira Watanabe, Nobuya Inagaki, Hidetoshi Sakurai
Myotonic dystrophy type 1 (DM1) is an autosomal-dominant multi-system disease caused by expanded CTG repeats in dystrophia myotonica protein kinase (DMPK). The expanded CTG repeats are unstable and can increase the length of the gene with age, which worsens the symptoms. In order to establish a human stem cell system suitable for the investigation of repeat instability, DM1 patient-derived iPSCs were generated and differentiated into three cell types commonly affected in DM1, namely cardiomyocytes, neurons and myocytes...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211914/eco-evolutionary-feedbacks-can-rescue-cooperation-in-microbial-populations
#13
Clara Moreno-Fenoll, Matteo Cavaliere, Esteban Martínez-García, Juan F Poyatos
Bacterial populations whose growth depends on the cooperative production of public goods are usually threatened by the rise of cheaters that do not contribute but just consume the common resource. Minimizing cheater invasions appears then as a necessary mechanism to maintain these populations. However, that invasions result instead in the persistence of cooperation is a prospect that has yet remained largely unexplored. Here, we show that the demographic collapse induced by cheaters in the population can actually contribute to the rescue of cooperation, in a clear illustration of how ecology and evolution can influence each other...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211787/clinical-factors-influencing-the-decision-to-order-red-blood-cell-transfusions-for-a-sample-of-us-dialysis-patients%C3%A2
#14
J Mark Stephens, John P Caloyeras, John Holmen, Victoria A Kumar, Spiros Tzivelekis, Allan Pollock
AIM: To characterize the clinical context for the decision to order red blood cell (RBC) transfusions in dialysis patients. MATERIALS AND METHODS: Retrospective review of medical records from three integrated health systems serving chronic dialysis patients. Subjects were randomly selected from all patients who received at least one transfusion between January 2009 and December 2013. Data abstracted included transfusion setting, prescribing clinician type, patient demographics and hemoglobin (Hb) concentration prior to transfusion, and cataloguing and prioritizing of clinical factors for their contribution to the decision to transfuse...
February 17, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28211720/dynamical-response-near-quantum-critical-points
#15
Andrew Lucas, Snir Gazit, Daniel Podolsky, William Witczak-Krempa
We study high-frequency response functions, notably the optical conductivity, in the vicinity of quantum critical points (QCPs) by allowing for both detuning from the critical coupling and finite temperature. We consider general dimensions and dynamical exponents. This leads to a unified understanding of sum rules. In systems with emergent Lorentz invariance, powerful methods from quantum field theory allow us to fix the high-frequency response in terms of universal coefficients. We test our predictions analytically in the large-N O(N) model and using the gauge-gravity duality and numerically via quantum Monte Carlo simulations on a lattice model hosting the interacting superfluid-insulator QCP...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211669/3-aminomethyl-derivatives-of-2-phenylimidazo-1-2-a-pyridine-as-positive-allosteric-modulators-of-gabaa-receptor-with-potential-antipsychotic-activity
#16
Monika Marcinkowska, Marcin Kolaczkowski, Krzysztof Kamiński, Adam Bucki, Maciej Henryk Pawlowski, Agata Siwek, Tadeusz Karcz, Gabriela Starowicz, Karolina Sloczynska, Elżbieta Pękala, Anna Wesołowska, Jerzy Samochowiec, Paweł Mierzejewski, Przemyslaw Bienkowski
Schizophrenia is a mental illness characterized by behavioral changes as well as anatomical and neurochemical abnormalities. There has been a remarkable progress in the drug discovery for schizophrenia; however, antipsychotics that act through molecular targets, other than monoaminergic receptors, have not been developed. One of the hypotheses of schizophrenia states that GABAergic dysfunction might be implemented in the pathophysiology of this disease. Our recent findings and previous clinical observations have suggested that modulation of GABAergic system through α1-GABAA receptors would represent an original approach for the treatment of schizophrenia...
February 17, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28211601/biogeography-of-nodulated-legumes-and-their-nitrogen-fixing-symbionts
#17
REVIEW
Janet I Sprent, Julie Ardley, Euan K James
Contents I. II. III. IV. V. VI. VII. VIII. References SUMMARY: In the last decade, analyses of both molecular and morphological characters, including nodulation, have led to major changes in our understanding of legume taxonomy. In parallel there has been an explosion in the number of genera and species of rhizobia known to nodulate legumes. No attempt has been made to link these two sets of data or to consider them in a biogeographical context. This review aims to do this by relating the data to the evolution of the two partners: it highlights both longitudinal and latitudinal trends and considers these in relation to the location of major land masses over geological time...
February 17, 2017: New Phytologist
https://www.readbyqxmd.com/read/28211520/multiple-crossovers-between-positive-and-negative-magnetoresistance-versus-field-due-to-fragile-spin-structure-in-metallic-gdpd3
#18
Abhishek Pandey, Chandan Mazumdar, R Ranganathan, D C Johnston
Studies on the phenomenon of magnetoresistance (MR) have produced intriguing and application-oriented outcomes for decades-colossal MR, giant MR and recently discovered extremely large MR of millions of percents in semimetals can be taken as examples. We report here the discovery of novel multiple sign changes versus applied magnetic field of the MR in the cubic intermetallic compound GdPd3. Our study shows that a very strong correlation between magnetic, electrical and magnetotransport properties is present in this compound...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211518/limited-options-for-low-global-warming-potential-refrigerants
#19
Mark O McLinden, J Steven Brown, Riccardo Brignoli, Andrei F Kazakov, Piotr A Domanski
Hydrofluorocarbons, currently used as refrigerants in air-conditioning systems, are potent greenhouse gases, and their contribution to climate change is projected to increase. Future use of the hydrofluorocarbons will be phased down and, thus replacement fluids must be found. Here we show that only a few pure fluids possess the combination of chemical, environmental, thermodynamic, and safety properties necessary for a refrigerant and that these fluids are at least slightly flammable. We search for replacements by applying screening criteria to a comprehensive chemical database...
February 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28211507/soil-aggregate-mediates-the-impacts-of-land-uses-on-organic-carbon-total-nitrogen-and-microbial-activity-in-a-karst-ecosystem
#20
Shuangshuang Xiao, Wei Zhang, Yingying Ye, Jie Zhao, Kelin Wang
Understanding the effect of land use on soil carbon, nitrogen, and microbial activity associated with aggregates is critical for thorough comprehension of the C and N dynamics of karst landscapes/ecosystems. We monitored soil organic carbon (SOC), total nitrogen (TN), microbial biomass carbon (MBC), and Cmic: Corg ratio in large macro- (>2 mm), small macro- (0.25-2 mm), and micro- (0.053-0.25 mm) aggregates to determine the changes in soil properties under different land uses in the karst area of Southwest China...
February 17, 2017: Scientific Reports
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