keyword
MENU ▼
Read by QxMD icon Read
search

Nature

keyword
https://www.readbyqxmd.com/read/29245177/microplastics-as-an-emerging-threat-to-terrestrial-ecosystems
#1
Anderson Abel de Souza Machado, Werner Kloas, Christiane Zarfl, Stefan Hempel, Matthias C Rillig
Microplastics (plastics < 5 mm, including nanoplastics which are < 0.1 μm) originate from the fragmentation of large plastic litter or from direct environmental emission. Their potential impacts in terrestrial ecosystems remain largely unexplored despite numerous reported effects on marine organisms. Most plastics arriving in the oceans were produced, used, and often disposed on land. Hence, it is within terrestrial systems that microplastics might first interact with biota eliciting ecologically relevant impacts...
December 15, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29245157/dynamic-cellular-complexity-of-anoxygenic-phototrophic-sulfur-bacteria-in-the-chemocline-of-meromictic-lake-cadagno
#2
Francesco Danza, Nicola Storelli, Samuele Roman, Samuel Lüdin, Mauro Tonolla
The meromictic Lake Cadagno is characterized by a compact chemocline with high concentrations of anoxygenic phototrophic purple sulfur bacteria (PSB) and green sulfur bacteria (GSB). The co-occurrence of phylogenetically distant bacterial groups such as PSB and GSB in the same ecological niche, makes the chemocline of Lake Cadagno an ideal system for studying the conditions and consequences of coexistence of photosynthetic bacteria populations. In this study, we applied flow cytometry (FCM) as a fast tool to identify metabolic changes due to the production and consumption of inclusion bodies such as sulfur globules (SGBs), and follow population dynamics of closely related anoxygenic photosynthetic sulfur bacteria in their natural environment...
2017: PloS One
https://www.readbyqxmd.com/read/29245151/substantial-enhancement-of-anaerobic-pyridine-bio-mineralization-by-electrical-stimulation
#3
Xinbai Jiang, Jinyou Shen, Kaichun Xu, Dan Chen, Yang Mu, Xiuyun Sun, Weiqing Han, Jiansheng Li, Lianjun Wang
Due to highly recalcitrant and toxicological nature of pyridine, the conventional anaerobic bioprocess is often limited by low removal rate and poor process stability. In this study, an electricity-assisted anaerobic system was developed in order to enhance biodegradation of pyridine from wastewater. The results showed that the performance and stability of the anaerobic reactor was remarkably improved for pyridine biodegradation with the applied direct current of 0.3 mA, where the efficiencies of pyridine and total organic carbon removal as well as NH4+-N formation were as high as 100...
December 5, 2017: Water Research
https://www.readbyqxmd.com/read/29245150/mobilization-of-arsenic-on-nano-tio2-in-soil-columns-with-sulfate-reducing-bacteria
#4
Ting Luo, Li Ye, Tingshan Chan, Chuanyong Jing
Arsenic (As) remediation in contaminated water using nanoparticles is promising. However, the fate and transport of As associated with nano-adsorbents in natural environment is poorly understood. To investigate the fate of adsorbed As on nano-TiO2 in changed redox condition from oxic to anoxic, we added the As(V)-TiO2 suspension in groundwater to an autoclaved soil column which inoculated a sulfate-reducing bacterium, Desulfovibrio vulgaris DP4. The dissolved As(V) in effluent increased to 798 μg/L for the biotic column and to 1510 μg/L for the abiotic control, and dissolved As(III) was observed only in biotic column...
December 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29245143/functionalization-of-protein-crystals-with-metal-ions-complexes-and-nanoparticles
#5
REVIEW
Satoshi Abe, Basudev Maity, Takafumi Ueno
Self-assembled proteins have specific functions in biology. With inspiration provided by natural protein systems, several artificial protein assemblies have been constructed via site-specific mutations or metal coordination, which have important applications in catalysis, material and bio-supramolecular chemistry. Similar to natural protein assemblies, protein crystals have been recognized as protein assemblies formed of densely-packed monomeric proteins. Protein crystals can be functionalized with metal ions, metal complexes or nanoparticles via soaking, co-crystallization, creating new metal binding sites by site-specific mutations...
December 12, 2017: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/29245100/student-motivation-stressors-and-intent-to-leave-nursing-doctoral-study-a-national-study-using-path-analysis
#6
Delene Volkert, Lori Candela, Matthew Bernacki
BACKGROUND: The demand for doctorally prepared nurses worldwide is higher than ever. Universities have responded with increased numbers of DNP and Ph.D. in Nursing programs. There are more doctoral nursing students than ever before yet they remain one of the least studied student populations. This is concerning given the high attrition rates reported in doctoral programs. The few studies that do exist are typically qualitative and exploratory in nature. OBJECTIVES: The aim of this national study of Ph...
December 6, 2017: Nurse Education Today
https://www.readbyqxmd.com/read/29245066/immuno-biological-comparison-of-hepatic-stellate-cells-in-a-reverted-and-activated-state
#7
Mehdi Najar, Hussein Fayyad-Kazan, Wissam H Faour, Adil El Taghdouini, Gordana Raicevic, Leo A van Grunsven, Mustapha Najimi, Etienne Sokal, Laurence Lagneaux
Human hepatic stellate cells (HSCs) demonstrated great immunological plasticity with important consequences for liver cell therapy. Activated HSCs (aHSCs) are in vitro reverted (rHSCs) to a quiescent-like phenotype with potential benefit to reduce liver fibrosis. The goal of this study is to establish and compare the immunological profile of activated and in vitro reverted HSCs and to investigate the impact of inflammatory priming on the immunobiology of both HSCs populations. The distribution of inflammatory primed activated and reverted HSCs across the different phases of the cell cycle is assessed by flow cytometry...
December 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29245048/the-time-dependent-prognostic-value-of-intratumoral-cytokine-expression-profiles-in-a-natural-course-of-primary-breast-cancer-with-a-long-term-follow-up
#8
Nataša Todorović-Raković, Marko Radulovic, Tijana Vujasinović, Jelena Milovanović, Dragica Nikolić-Vukosavljević
Despite the increasing evidence for the importance of immunity in breast cancer, the contradictory role of inflammation has not been thoroughly researched. In this study, we investigate the prognostic value of intratumoral inflammation as evaluated by cytokine mRNA levels. Intratumoral mRNA was measured for IL1β, IL6, IL8, IL10 and IL17A, using Taqman quantitative PCR. By the AUC criteria, none of the cytokines associated with metastasis outcome over the entire follow-up period. However, separation of the follow-up period has revealed a time-dependent and robust prognostic association of IL β...
December 12, 2017: Cytokine
https://www.readbyqxmd.com/read/29245039/prenatal-arsenic-exposure-child-marriage-and-pregnancy-weight-gain-associations-with-preterm-birth-in-bangladesh
#9
Mohammad L Rahman, Molly L Kile, Ema G Rodrigues, Linda Valeri, Anita Raj, Maitreyi Mazumdar, Golam Mostofa, Quazi Quamruzzaman, Mahmudur Rahman, Russ Hauser, Andrea Baccarelli, Liming Liang, David C Christiani
BACKGROUND: Preterm birth is a disease of multifactorial etiologies that has environmental, social, and maternal health components. Individual studies have shown that exposure to arsenic contaminated drinking water, child marriage, and low maternal weight gain during pregnancy contribute to preterm birth. These factors are highly prevalent and often co-exist in Bangladesh, a country in South Asia with one of the world's highest prevalences of preterm birth. OBJECTIVE: To evaluate the individual and interactive effects of prenatal arsenic exposure, child marriage, and pregnancy weight gain on preterm birth in a prospective birth cohort in Bangladesh...
December 12, 2017: Environment International
https://www.readbyqxmd.com/read/29244996/health-seeking-behavior-and-barriers-to-care-in-patients-with-rectal-bleeding-in-nigeria
#10
Olusegun I Alatise, Sara E Fischer, Omobolaji O Ayandipo, Akinlolu G Omisore, Samuel A Olatoke, T Peter Kingham
Purpose Colorectal cancer (CRC) incidence rates are steadily increasing in Nigeria. Organized screening is still largely unused because of financial and logistical barriers; most CRCs are detected by symptoms. One symptom of CRC is rectal bleeding. This study sought to determine health-seeking behavior and barriers to care in patients with rectal bleeding in Nigeria. This study also surveyed physicians to determine major breakdowns in access to care. Methods The recruitment process for this study involved patients referred for colonoscopy because of rectal bleeding as well as response to a media advertisement for a free colonoscopy...
December 2017: Journal of Global Oncology
https://www.readbyqxmd.com/read/29244970/maggot-debridement-therapy-for-an-electrical-burn-injury-with-instructions-for-the-use-of-lucilia-sericata-larvae
#11
A Nasoori, R Hoomand
OBJECTIVE: Maggot debridement therapy (MDT) has proved an efficient and reliable approach for wound healing. We explain the use of maggots with a stepwise procedure for conducting MDT in a patient with severe and large electrical wounds. METHOD: We captured the flies of Lucilia sericata from the natural environment, Alborz, Iran, and reared them in netted cages. The eggs obtained from the flies were disinfected with chloramine, and then were incubated on culture medium...
December 2, 2017: Journal of Wound Care
https://www.readbyqxmd.com/read/29244955/dose-and-diet-sources-of-arsenic-intake-in-mouse-in-utero-exposure-scenarios
#12
Manuela Murko, Brittany Elek, Miroslav Styblo, David James Thomas, Kevin A Francesconi
In humans, early life exposure to inorganic arsenic is associated with adverse health effects. Inorganic arsenic in utero or in early postnatal life also produces adverse health effects in offspring of pregnant mice that consumed drinking water containing low part per billion levels of inorganic arsenic. Because aggregate exposure of pregnant mice to inorganic arsenic from both drinking water and food has not been fully evaluated in experimental studies, quantifying arsenic exposure of the developing mouse is problematic...
December 15, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29244950/bio-inspired-assembly-of-carbon-nanotube-into-graphene-aerogel-with-cabbage-like-hierarchical-porous-structure-for-highly-efficient-organic-pollutants-cleanup
#13
Wenwei Zhan, Siruo Yu, Liang Gao, Feng Wang, Xue Fu, Gang Sui, Xiaoping Yang
Nowadays, physical absorption has become a feasible method offering an efficient and green route to remove organic pollutants from the industrial wastewater. Inspired by polydopamine (PDA) chemistry, one dimensional PDA functionalized multi-walled carbon nanotubes (MWCNT-PDA) were creatively introduced into graphene aerogel framework to synthesis a robust graphene/MWCNT-PDA composite aerogel (GCPCA). The whole forming process needed no additional reducing agents, significantly reducing the contamination emissions to the environment...
December 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29244907/pleading-for-a-dual-molecular-orbital-valence-bond-culture
#14
Philippe Charles Hiberty
The history of the two main theories of chemical bonding, Valence Bond and Molecular Orbital theories, with their respective localized and delocalized visions of the electron pairs, is briefly recalled with an emphasis on their equivalence at comparable computational levels. The delocalized/localized alternative also exists in the very framework of MO theory, since localized MOs can be obtained through unitary transformations which leave Slater determinants invariant. In particular, the use of hybrid orbitals in chemical interpretations is thus perfectly justified...
December 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29244905/posttraumatic-stress-symptoms-and-posttraumatic-growth-in-children-and-adolescents-following-an-earthquake-a-latent-transition-analysis
#15
Jieling Chen, Xinchun Wu
This study examined the transitions in classes of posttraumatic stress symptoms and posttraumatic growth in a sample of children and adolescents (N = 757), between 8 and 20 months after the 2013 Ya'an earthquake in China. Using latent profile analysis, three classes of symptoms (resilient, thriving, and struggling) were identified at 8 and 20 months after the earthquake. Latent transition analysis indicated that the majority of survivors remained in the same class during the period, while others showed a transition between different classes over time...
December 2017: Journal of Traumatic Stress
https://www.readbyqxmd.com/read/29244887/carbon-fiber-framework-for-full-arch-implant-supported-fixed-dental-prostheses-supporting-resin-based-composite-and-lithium-disilicate-ceramic-crowns-case-report-and-description-of-features
#16
Giuseppe Castorina
This case report presents a new approach for shock-absorbing carbon-fiber composite frameworks for full-arch implant-supported fixed dental prostheses supporting resin-based and lithium disilicate ceramic crowns. It describes the characteristics of the materials used, the procedures for implementing the framework, and the requirements to achieve the best mechanical and clinical properties. The result is a full-arch prosthesis with masticatory load shock-absorption capacities, chemical bonding between materials, good esthetics, and wear similar to natural enamel...
December 15, 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29244863/a-parapoxviral-virion-protein-targets-the-retinoblastoma-protein-to-inhibit-nf-%C3%AE%C2%BAb-signaling
#17
Ponnuraj Nagendraprabhu, Sushil Khatiwada, Sabal Chaulagain, Gustavo Delhon, Daniel L Rock
Poxviruses have evolved multiple strategies to subvert signaling by Nuclear Factor κB (NF-κB), a crucial regulator of host innate immune responses. Here, we describe an orf virus (ORFV) virion-associated protein, ORFV119, which inhibits NF-κB signaling very early in infection (≤ 30 min post infection). ORFV119 NF-κB inhibitory activity was found unimpaired upon translation inhibition, suggesting that virion ORFV119 alone is responsible for early interference in signaling. A C-terminal LxCxE motif in ORFV119 enabled the protein to interact with the retinoblastoma protein (pRb) a multifunctional protein best known for its tumor suppressor activity...
December 15, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29244848/surface-modified-nanoparticles-as-anti-biofilm-filler-for-dental-polymers
#18
Nathan Zaltsman, Andrei C Ionescu, Ervin I Weiss, Eugenio Brambilla, Shaul Beyth, Nurit Beyth
The objective of the study was to synthesis silica nanoparticles modified with (i) a tertiary amine bearing two t-cinnamaldehyde substituents or (ii) dimethyl-octyl ammonium, alongside the well-studied quaternary ammonium polyethyleneimine nanoparticles. These were to be evaluated for their chemical and mechanical properties, as well for antibacterial and antibiofilm activity. Samples were incorporated in commercial dental resin material and the degree of monomer conversion, mechanical strength, and water contact angle were tested to characterize the effect of the nanoparticles on resin material...
2017: PloS One
https://www.readbyqxmd.com/read/29244846/characterization-of-a-not-so-new-potexvirus-from-babaco-vasconcellea-x-heilbornii
#19
Robert A Alvarez-Quinto, Juan F Cornejo-Franco, Diego F Quito-Avila
A new member of the genus Potexvirus was fully sequenced and characterized. The virus was isolated from babaco (Vasconcellea x heilbornii), a natural hybrid native to Ecuador. The virus contains a 6,692 nt long genome organized in five open reading frames in an arrangement typical of other potexviruses. Sequence comparisons revealed close relatedness with Papaya mosaic virus (PapMV), Alternathera mosaic virus (AltMV) and Senna mosaic virus (SenMV), exhibiting nucleotide identities up to 67% for the polymerase (Pol) and 68% for the coat protein (CP), with deduced amino acid identities of 70% and 72% for the Pol and CP, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/29244779/omega-3-long-chain-polyunsaturated-fatty-acids-and-preeclampsia-trials-say-no-but-is-it-the-final-word
#20
REVIEW
Denis I Burchakov, Irina V Kuznetsova, Yuliya B Uspenskaya
Preeclampsia is a dangerous disorder of pregnancy, defined as hypertension with proteinuria. Its nature remains elusive, and measures of prevention and treatment are limited. Observational studies have suggested that preeclampsia is associated with low intake of omega-3 long-chain polyunsaturated fatty acids (LCPUFA). In recent decades, researchers studied LCPUFA supplementation as a measure to prevent preeclampsia. Most of these trials and later systematic reviews yielded negative results. However, these trials had several important limitations associated with heterogeneity and other issues...
December 15, 2017: Nutrients
keyword
keyword
14200
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"