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https://www.readbyqxmd.com/read/29778056/one-century-sedimentary-record-of-heavy-metal-pollution-in-western-taihu-lake-china
#1
Yan Li, Shenglu Zhou, Qing Zhu, Baojie Li, Junxiao Wang, Chunhui Wang, Lian Chen, Shaohua Wu
Long-term trends of sediment compositions are important for assessing the impact of human activities on the sediment and protecting the sediment environment. In this study, based on the contents of heavy metals and the Pb isotope ratios in lake sediments, atmospheric dustfall and soil in Yixing, China, the representative heavy metals (Zn, Pb, Cr and Cd) in lake sediments from western Taihu Lake were studied. The evolution history of heavy metals in the local environment was constructed for the past 100 years...
May 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29778048/pathogens-constancy-harbinger-of-nosocomial-infection-cum-identification-of-resistant-genes-and-drug-designing
#2
Sana Farooq Ahmad, Ibrar Khan, Abdul Wadood, Sadiq Azam, Noor Rehman, Muhammad Waqas, Kashif Bashir, Asaf Ali Khan
Hospitals are the most prominent places for the growth and spread of bacteria which are resistant to the available antibiotics. This antibiotic resistance is due to the over and misuse of antibiotic dosages of a high-density of patient population which are in frequent interaction with inanimate items of the hospitals and the consequent risk of cross infection. Out of 1010 samples of the current study, 510 (50.49%) were culture positive of which 329 (64.5%) were Gram-positive while 181 (35.49%) Gram negative...
April 22, 2018: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/29778047/source-identification-and-spatial-distribution-of-arsenic-and-heavy-metals-in-agricultural-soil-around-hunan-industrial-estate-by-positive-matrix-factorization-model-principle-components-analysis-and-geo-statistical-analysis
#3
Xiaowen Zhang, Shuai Wei, Qianqian Sun, Syed Abdul Wadood, Boli Guo
Characterizing the distribution and defining potential sources of arsenic and heavy metals are the basic preconditions for reducing the contamination of heavy metals and metalloids. 71 topsoil samples and 61 subsoil samples were collected by grid method to measure the concentration of cadmium (Cd), arsenic (As), lead (Pb), copper (Cu), zinc (Zn), nickel (Ni) and chromium (Cr). Principle components analysis (PCA), GIS-based geo-statistical methods and Positive Matrix Factorization (PMF) were applied. The results showed that the mean concentrations were 9...
May 16, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29778041/the-efficacy-of-vitamin-d-in-multiple-sclerosis-a-meta-analysis
#4
REVIEW
Chao Zheng, Liang He, Lingling Liu, Jie Zhu, Tao Jin
BACKGROUND: Multiple sclerosis (MS) is a chronic inflammatory demyelination disorder in the central nervous system (CNS) leading to a high level of neurological disability. The pathogenesis of MS remains largely unknown, which explains the lack of significant efficacy of therapy in MS. Vitamin D deficiency is widely considered to be an environmental risk factor for MS. Many studies investigating the therapeutic effects of vitamin D on MS have been applied. The objective of this systematic review and meta-analysis was to evaluate the effectiveness of vitamin D in MS patients...
May 12, 2018: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/29778037/efficient-electrochemical-degradation-of-multiwall-carbon-nanotubes
#5
Vytas Reipa, Shannon K Hanna, Aaron Urbas, Lane Sander, John Elliott, Joseph Conny, Elijah J Petersen
As the production mass of multiwall carbon nanotubes (MWCNT) increases, the potential for human and environmental exposure to MWCNTs may also increase. We have shown that exposing an aqueous suspension of pristine MWCNTs to an intense oxidative treatment in an electrochemical reactor, equipped with an efficient hydroxyl radical generating Boron Doped Diamond (BDD) anode, leads to their almost complete mineralization. Thermal optical transmittance analysis showed a total carbon mass loss of over two orders of magnitude due to the electrochemical treatment, a result consistent with measurements of the degraded MWCNT suspensions using UV-vis absorbance...
April 26, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29777988/insight-into-structural-requirements-for-selective-and-or-dual-cxcr3-and-cxcr4-allosteric-modulators
#6
Anja Kolarič, Urban Švajger, Tihomir Tomašič, Regine Brox, Theresa Frank, Nikola Minovski, Nuska Tschammer, Marko Anderluh
Based on the previously published pyrazolopyridine-based hit compound for which negative allosteric modulation of both CXCR3 and CXCR4 receptors was disclosed, we designed, synthesized and biologically evaluated a set of novel, not only negative, but also positive allosteric modulators with preserved pyrazolopyridine core. Compound 9e is a dual negative modulator, inhibiting G protein activity of both receptors. For CXCR4 receptor para-substituted aromatic group of compounds distinguishes between negative and positive modulation...
May 11, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29777968/ecological-momentary-assessment-of-food-perceptions-and-eating-behavior-using-a-novel-phone-application-in-adults-with-or-without-obesity
#7
Kholoud Alabduljader, Marion Cliffe, Francesco Sartor, Gabriele Papini, W Miles Cox, Hans-Peter Kubis
We developed a smart phone application to measure participants' food-reward perceptions and eating behavior in their naturalistic environment. Intensity ratings (0 - not at all to 10 - very strongly) of perceived anticipation of food (wanting) and food enjoyment at endpoint of intake (liking) were recorded as they occurred over a period of 14 days. Moreover, food craving trait, implicit and explicit attitude towards healthy food, and body composition were assessed. 53 participants provided complete data. Participants were classified by percentage of body fat; 33 participants with lower body fat (L-group) and 20 with higher body fat (H-group; ≥25% body fat for males and ≥32% for females)...
May 12, 2018: Eating Behaviors
https://www.readbyqxmd.com/read/29777965/what-do-we-know-about-sibling-attended-birth-an-integrative-literature-review
#8
REVIEW
Nora L Naber, Suzanne Miller, Sally A Baddock
OBJECTIVE: to consolidate existing research in the field of sibling attended birth (SAB) into a body of knowledge to inform decision-making processes and guide midwifery practice throughout the sibling attended birth experience. DESIGN: An integrative literature review. DATA SOURCES: CINAHL Complete, Cochrane Library, PubMed, Index New Zealand, Australia/New Zealand Reference Centre, grey literature databases REVIEW METHODS: An extensive search of five electronic databases as well as 17 grey literature databases was conducted...
May 8, 2018: Midwifery
https://www.readbyqxmd.com/read/29777958/sssupramolecular-poly-acrylic-acid-f127-hydrogel-with-hydration-controlled-nitric-oxide-release-for-enhancing-wound-healing
#9
Mathilde Champeau, Valéria Póvoa, Lucas Militão, Flávia Cabrini, Guilherme F Picheth, Florian Meneau, Carlos P Jara, Eliana P de Araujo, Marcelo G de Oliveira
Topical nitric oxide (NO) delivery has been shown to accelerate wound healing. However, delivering NO to wounds at appropriate rates and doses requires new biomaterial-based strategies. Here, we describe the development of supramolecular interpolymer complex hydrogels comprising PEO-PPO-PEO (F127) micelles embedded in a poly(acrylic acid) (PAA) matrix, with S-nitrosoglutathione (GSNO) molecules dissolved in the hydrophilic domain. We show that PAA:F127/GSNO hydrogels start releasing NO upon hydration at rates controlled by their rates of water absorption...
May 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29777955/perspectives-and-limitations-for-nucleo-t-side-analogs-in-future-hbv-therapies
#10
REVIEW
Massimo Levrero, Miroslava Subic, Francois Villeret, Fabien Zoulim
The latest generation of nucleo(t)side analogs (NAs) provide robust virus suppression with high barrier to resistance. Long term NAs treatment is associated with a partial restoration in HBV-specific T-cell functions, regression of fibrosis, no disease progression and a reduction of HCC risk but rarely lead to cure and life-long treatments is often required. New insights into the hepatitis B viral life cycle and the host immune response have expanded the potential targets for drug therapies with interesting antiviral candidates and novel immunotherapeutic approaches in early stage development...
May 16, 2018: Current Opinion in Virology
https://www.readbyqxmd.com/read/29777952/the-opportunity-to-avoid-pain-may-paradoxically-increase-fear
#11
Christine M van Vliet, Ann Meulders, Linda M G Vancleef, Johan W S Vlaeyen
Fear-avoidance models propose that pain-related fear may spur avoidance behaviour leading to chronic pain disability. Pain-related fear elicits avoidance behaviour, which is typically aimed at reducing fear. We hypothesized that engaging in avoidance may (paradoxically) increase rather than decrease pain-related fear (i.e. bidirectionality hypothesis). In a between-subject design, participants (N=64) were randomly assigned to the avoidance group or the control group. Avoidance group participants were led to believe they could avoid full exposure to a painful heat stimulus by pressing the stop-button, while control group participants believed they were exposed to the full painful heat stimulus at all times...
May 16, 2018: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/29777946/screening-method-for-rapid-classification-of-psychoactive-substances-in-illicit-tablets-using-mid-infrared-spectroscopy-and-pls-da
#12
Leandro S A Pereira, Fernanda L C Lisboa, José Coelho Neto, Frederico N Valladão, Marcelo M Sena
Several new psychoactive substances (NPS) have reached the illegal drug market in recent years, and ecstasy-like tablets are one of the forms affected by this change. Cathinones and tryptamines have increasingly been found in ecstasy-like seized samples as well as other amphetamine type stimulants. A presumptive method for identifying different drugs in seized ecstasy tablets (n=92) using ATR-FTIR (attenuated total reflectance - Fourier transform infrared spectroscopy) and PLS-DA (partial least squares discriminant analysis) was developed...
May 9, 2018: Forensic Science International
https://www.readbyqxmd.com/read/29777932/application-of-a-surfactant-assisted-dispersive-liquid-liquid-microextraction-method-along-with-central-composite-design-for-micro-volume-based-spectrophotometric-determination-of-low-level-of-cr-vi-ions-in-aquatic-samples
#13
Hamid Reza Sobhi, Efat Azadikhah, Mohammad Behbahani, Ali Esrafili, Mahnaz Ghambarian
A fast, simple, low cost surfactant-assisted dispersive liquid-liquid microextraction method along with central composite design for the determination of low level of Cr(VI) ions in several aquatic samples has been developed. Initially, Cr(VI) ions present in the aqueous sample were readily reacted with 1,5‑diphenylcarbazide (DPC) in acidic medium through complexation. Sodium dodecyl sulfate (SDS), as an anionic surfactant, was then employed as an ion-pair agent to convert the cationic complex into the neutral one...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29777930/experimental-and-theoretical-study-of-fingerprint-spectra-of-2-4-fluorophenyl-benzimidazole-and-2-4-chlorophenyl-benzimidazole-in-terahertz-range
#14
Maojiang Song, Fei Yang, Liping Liu, Li Shen, Pengfei Hu, Caixia Su
Due to wide variety of biological and pharmacological activities of benzimidazole derivatives, the terahertz fingerprint spectra of 2-(4-fluorophenyl)benzimidazole and 2-(4-chlorophenyl)benzimidazole are researched by employing terahertz time-domain spectroscopy and density functional theory systematically. Although the substituent at the para position on the benzene moiety are the same family elements (F, Cl) in the periodic table, both experimental and theoretical results show that there are substantial differences in their fingerprint spectra in the range of 0...
May 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29777921/comparison-of-heavy-metals-parasites-and-histopathology-in-sculpins-myoxocephalus-spp-from-two-sites-at-a-lead-zinc-mine-in-north-east-greenland
#15
Rasmus Dyrmose Nørregaard, Mai Dang, Lis Bach, Ole Geertz-Hansen, Kim Gustavson, Peter Aastrup, Pall S Leifsson, Jens Søndergaard, Barbara Nowak, Christian Sonne
The former lead-zinc mine at Mestersvig, Greenland, continues to contaminate the surrounding environment despite its operations ceasing over 50 years ago. Elevated concentrations of heavy metals are found in water, sediment and biota in the terrestrial, freshwater and marine environments. To shed light on the present contamination and its potential effects on local fish we investigated gill and liver histology of sculpins (Myoxocephalus spp.) around the former mining area. Two species of sculpins were caught; shorthorn sculpins (M...
May 16, 2018: Environmental Research
https://www.readbyqxmd.com/read/29777904/axed-muc4-muc4-x-aggravates-pancreatic-malignant-phenotype-by-activating-integrin-%C3%AE-1-fak-erk-pathway
#16
Rahat Jahan, Muzafar A Macha, Satyanarayana Rachaghani, Srustidhar Das, Lynette M Smith, Sukhwinder Kaur, Surinder K Batra
Alternative splicing is evolving as an eminent player of oncogenic signaling for tumor development and progression. Mucin 4 (MUC4), a type I membrane-bound mucin, is differentially expressed in pancreatic cancer (PC) and plays a critical role in its progression and metastasis. However, the molecular implications of MUC4 splice variants during disease pathogenesis remain obscure. The present study delineates the pathological and molecular significance of a unique splice variant of MUC4, MUC4/X, which lacks the largest and polymorphic exon 2, along with exon 3...
May 16, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29777903/sox9-is-increased-in-arterial-plaque-and-stenosis-associated-with-synthetic-phenotype-of-vascular-smooth-muscle-cells-and-causes-alterations-in-extracellular-matrix-and-calcification
#17
Antje Augstein, Johannes Mierke, David M Poitz, Ruth H Strasser
Vascular smooth muscle cells (VSMC) exhibit a dual role in progression and maintenance of arteriosclerosis. They are fundamental for plaque stability but also can drive plaque progression. During pathogenic vascular remodeling, VSMC transdifferentiate into a phenotype with enhanced proliferation and migration. Moreover, they exert an increased capacity to generate extracellular matrix proteins. A special lineage of transdifferentiated VSMC expresses Sox9, a multi-functional transcription factor. The aim of the study was to examine the role of Sox9 in phenotypic alterations leading to arteriosclerosis...
May 16, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29777885/posttraumatic-cerebrospinal-fluid-leak-associated-with-an-upper-cervical-meningeal-diverticulum
#18
Noriya Enomoto, Hideo Mure, Toshiyuki Okazaki, Mai Azumi, Shinya Okita, Shinji Nagahiro, Yasushi Takagi
Spontaneous intracranial hypotension (SIH) has been increasingly recognized as a phenomenon caused by cerebrospinal fluid (CSF) leaks; however, its pathogenesis is still unclear. Here, we report two cases of SIH as a result of CSF leak from a meningeal diverticulum at the C2 nerve root sleeve. The first case is that of a 46-year-old man who had suffered from orthostatic headache after a bicycle accident at age 45. Computed tomography (CT) myelography revealed CSF leaks at the C1/2 level. He underwent epidural blood patch (EBP) therapy, but it was unsuccessful...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29777883/atypical-presentation-of-giant-aneurysm-in-a-pediatric-patient-with-duane-syndrome
#19
Chao-Hung Kuo, Lynn B McGrath, Joseph A Carnevale, Neena I Marupudi, Jeffery G Ojemann, Richard G Ellenbogen, Anthony C Wang
BACKGROUND: Duane syndrome is a congenital eye movement disorder characterized by congenital malformation of the abducens nucleus. Thrombogenic conditions during development may lead to vascular anomalies in Duane syndrome, however, the presence of a giant aneurysm in this patient population is a rarely documented phenomenon. CASE DESCRIPTION: We reported a case of a large cerebral aneurysm in a pediatric patient with Duane syndrome, and performed a review of the literatures to identify other potential cases and associations...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29777874/asymmetric-dimethylarginine-contributes-to-retinal-neovascularization-of-diabetic-retinopathy-through-ephrinb2-pathway
#20
Mei-Rong Du, Li Yan, Nian-Sheng Li, Yu-Jie Wang, Ting Zhou, Jun-Lin Jiang
Diabetic retinopathy (DR) is a leading cause of vision loss with retinal neovascularization. This study aims to investigate whether Asymmetric dimethylarginine (ADMA) impacts the pathogenesis of DR via focusing on promoting retinal neovascularization and its underlying molecular mechanisms. Diabetic rats were induced by a single intraperitoneal injection of streptozotocin (STZ) for 20 weeks. ADMA levels in aqueous and the influence of hypoxia on ADMA and angiogenesis in RF/6A cells were examined. The effects and underlying molecular mechanisms of ADMA on neovascularization of RF/6A cells were further evaluated by administration of ADMA, DDAH siRNA or ephrinB2 siRNA...
May 16, 2018: Vascular Pharmacology
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