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https://www.readbyqxmd.com/read/29150628/artificial-topography-changes-the-growth-strategy-of-spartina-alterniflora-case-study-with-wave-exposure-as-a-comparison
#1
Hualong Hong, Minyue Dai, Haoliang Lu, Jingchun Liu, Jie Zhang, Chaoqi Chen, Kang Xia, Chongling Yan
This paper reports findings about the growth of Spartina alterniflora (Loisel.) near an engineered coastal protection defences to discover the potential influences on vegetation growth from the artificial topography. Impacts of the artificial topography on the sediment element composition were detected by comparing the fixed effects caused by artificial topography and wave exposure using linear mixed models. Surficial sediments under the impacts of artificial topography contain elevated levels of biogenic elements and heavy metals, including C (and organic carbon), N, S, Al, Fe, Mn, Cu, Zn, As, Cd, Cr, Ni, and Pb...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149978/perioperative-prophylaxis-for-total-artificial-heart-transplantation
#2
H E Chambers, P Pelish, F Qiu, D F Florescu
BACKGROUND: Practice variation regarding perioperative antimicrobial prophylaxis in total artificial heart transplantations (TAH-t) across institutions is unknown. The aim of our survey was to assess the current practices for prevention of infection in TAH-t recipients among different programs. METHODS: An electronic survey was sent to programs that implant Syncardia TAH (Syncardia Systems, Tuscon, Ariz, USA). Proportions were analyzed for categorical variables; means and SDs were analyzed for continuous variables...
November 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/29145859/singapore-s-anopheles-sinensis-form-a-is-susceptible-to-plasmodium-vivax-isolates-from-the-western-thailand-myanmar-border
#3
Sook-Cheng Pang, Chiara Andolina, Benoit Malleret, Peter R Christensen, Sai-Gek Lam-Phua, Muhammad Aliff Bin Abdul Razak, Chee-Seng Chong, Daiqin Li, Cindy S Chu, Bruce Russell, Laurent Rénia, Lee-Ching Ng, Francois Nosten
BACKGROUND: Singapore has been certified malaria-free by the World Health Organization since November 1982. However, sporadic autochthonous malaria outbreaks do occur. In one of the most recent outbreaks of vivax malaria, an entomological investigation identified Anopheles sinensis as the most probable vector. As metaphase karyotype studies divided An. sinensis into two forms, A and B, with different vector competence: the investigation of vector competence of An. sinensis found in Singapore was thus pursued using Plasmodium vivax field isolates from the Thailand-Myanmar border...
November 16, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29144723/inorganic-strengthened-hydrogel-membrane-as-regenerative-periosteum
#4
Tianwen Xin, Yong Gu, Ruoyu Cheng, Jincheng Tang, Zhiyong Sun, Wenguo Cui, Liang Chen
Periosteum plays the pivotal role in neomineralization, vascularization and protection during bone tissue regeneration. However, many artificial periosteum focused only on protection and lacked of the osteogenesis and angiogenesis functional capacity. In this study, we developed a novelty inorganic strengthened gelatin hydrogel membrane via inorganic and organic co-cross-linked double network as artificial periosteum for enhancing the durable angiogenesis and osteogenesis in bone reconstruction. Mesoporous bioactive glass nanoparticles (MBGNs) chemically modified with photo-cross-linkable gelatin derivative (GelMA) were further incorporated into GelMA to fabricate an organic/inorganic co-cross-linked hydrogel membrane (GelMA-G-MBGNs)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144022/collagen-a-review-on-its-sources-and-potential-cosmetic-applications
#5
REVIEW
María Isabela Avila Rodríguez, Laura G Rodríguez Barroso, Mirna Lorena Sánchez
Collagen is a fibrillar protein that conforms the conjunctive and connective tissues in the human body, essentially skin, joints, and bones. This molecule is one of the most abundant in many of the living organisms due to its connective role in biological structures. Due to its abundance, strength and its directly proportional relation with skin aging, collagen has gained great interest in the cosmetic industry. It has been established that the collagen fibers are damaged with the pass of time, losing thickness and strength which has been strongly related with skin aging phenomena [Colágeno para todo...
November 16, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/29143725/thalassotalea-atypica-sp-nov-isolated-from-seawater-and-emended-description-of-thalassotalea-eurytherma
#6
Yan Wang, Tingwei Liu, Hong Ming, Pengyang Sun, Chenxi Cao, Menglong Guo, Junran Du, Chenyan Zhou, Wuling Zhu
A novel Gram-stain-negative, straight or slightly curved rod-shaped, non-spore-forming, non-flagellated, strictly aerobic strain, designated RZG4-3-1(T), was isolated from coastal seawater of Rizhao, China (119.625° E 35.517° N). The organism grew optimally at 24-28 °C, at pH 7.0 and in the presence of 2.0 % (w/v) NaCl. The strain required seawater or artificial seawater for growth, and NaCl alone did not support growth. Strain RZG4-3-1(T) contained ubiquinone 8 (Q-8) as the major respiratory quinone and contained C16 : 1ω7c and/or C16 : 1ω6c and C16 : 0 as the dominant fatty acids...
November 16, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29137648/lesr-is-a-novel-upstream-regulator-that-controls-downstream-clp-expression-to-modulate-antibiotic-hsaf-biosynthesis-and-cell-aggregation-in-lysobacter-enzymogenes-oh11
#7
Huiyong Xu, Ruping Wang, Yangyang Zhao, Zheng Qing Fu, Guoliang Qian, Fengquan Liu
BACKGROUND: Heat-stable antifungal factor (HSAF) is a polycyclic tetramate macrolactam secondary metabolite that exhibits broad-spectrum inhibitory activities against filamentous fungal pathogens. The native yield of this chemical is low. It is also a great challenge to synthesize HSAF artificially, due to its complex structure. Understanding the regulatory mechanism underlying HSAF biosynthesis could provide genetic basis for engineering high HSAF-producing strain. The transcription factor Clp is a global regulator that controls bacterial pathogenicity and the expression of one hundred related genes in the phytopathogenic bacterium Xanthomonas campestris pv...
November 14, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/29134460/enzyme-based-electrobiotechnological-synthesis
#8
Lisa Marie Schmitz, Katrin Rosenthal, Stephan Lütz
Oxidoreductases are enzymes with a high potential for organic synthesis, as their selectivity often exceeds comparable chemical syntheses. The biochemical cofactors of these enzymes need regeneration during synthesis. Several regeneration methods are available but the electrochemical approach offers an efficient and quasi mass-free method for providing the required redox equivalents. Electron transfer systems involving direct regeneration of natural and artificial cofactors, indirect electrochemical regeneration via a mediator, and indirect electroenzymatic cofactor regeneration via enzyme and mediator have been investigated...
November 14, 2017: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/29132294/artificial-selection-for-odor-guided-behavior-in-drosophila-reveals-changes-in-food-consumption
#9
Elizabeth B Brown, Cody Patterson, Rayanne Pancoast, Stephanie M Rollmann
BACKGROUND: The olfactory system enables organisms to detect chemical cues in the environment and can signal the availability of food or the presence of a predator. Appropriate behavioral responses to these chemical cues are therefore important for organismal survival and can influence traits such as organismal life span and food consumption. However, understanding the genetic mechanisms underlying odor-guided behavior, correlated responses in other traits, and how these constrain or promote their evolution, remain an important challenge...
November 13, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29132002/brassica-napus-has-a-key-role-in-the-recovery-of-the-health-of-soils-contaminated-with-metals-and-diesel-by-rhizoremediation
#10
Rafael G Lacalle, María T Gómez-Sagasti, Unai Artetxe, Carlos Garbisu, José M Becerril
Contaminated soils are frequently characterized by the simultaneous presence of organic and inorganic contaminants, as well as a poor biological and nutritional status. Rhizoremediation, the combined use of phytoremediation and bioremediation, has been proposed as a Gentle Remediation Option to rehabilitate multi-contaminated soils. Recently, newer techniques, such as the application of metallic nanoparticles, are being deployed in an attempt to improve traditional remediation options. In order to implement a phytomanagement strategy on calcareous alkaline peri-urban soils simultaneously contaminated with several metals and diesel, we evaluated the effectiveness of Brassica napus L...
November 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29131973/investigation-of-the-photocatalytic-transformation-of-acesulfame-k-in-the-presence-of-different-tio2-based-materials
#11
M J López-Muňoz, A Daniele, M Zorzi, C Medana, P Calza
The photocatalytic transformation of acesulfame K - an artificial sweetener that has gained popularity over the last decades for being a calorie-free additive in food, beverages and several pharmaceutical products - was studied using three different photocatalysts, the benchmark TiO2-P25 and two other forms of synthetized titanium oxides named TiO2-SG1 and TiO2-SG2. The two latter materials were synthesized by a sol gel process in which the hydrolysis rate of titanium n-butoxide was controlled by the water formed in situ through an esterification reaction between ethanol and acetic acid...
November 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/29131855/phytyl-fatty-acid-esters-in-vegetables-pose-a-risk-for-patients-suffering-from-refsum-s-disease
#12
Stephanie Krauß, Lea Michaelis, Walter Vetter
Patients suffering from Refsum's disease show mutations in the enzyme necessary for the degradation of phytanic acid. Accumulation of this tetramethyl-branched fatty acid in inner organs leads to severe neurological and cardiac dysfunctions which can even result in death. Thus, patients with Refsum's disease have to follow a specific diet resigning foods with high levels of phytanic acid and trans-phytol like products from ruminant animals with a tolerable daily intake (TDI) of ≤ 10 mg/d. We recently reported the occurrence of phytyl fatty acid esters (PFAE, trans-phytol esterified with a fatty acid) in bell pepper with trans-phytol amounts of up to 5...
2017: PloS One
https://www.readbyqxmd.com/read/29131388/saccharomyces-interspecies-hybrids-as-model-organisms-for-studying-yeast-adaptation-to-stressful-environments
#13
Ksenija Lopandic
The strong development of molecular biology techniques and next-generation sequencing technologies in the last two decades has significantly improved our understanding of the evolutionary history of Saccharomyces yeasts. It has been shown that many strains isolated from man-made environments are not pure genetic lines, but contain genetic materials from different species that substantially increase their genome complexity. A number of strains have been described as interspecies hybrids, implying different yeast species that under specific circumstances exchange and recombine their genomes...
November 13, 2017: Yeast
https://www.readbyqxmd.com/read/29129979/hair-germ-model-in-vitro-via-human-postnatal-keratinocyte-dermal-papilla-interactions-impact-of-hyaluronic-acid
#14
Ekaterina Kalabusheva, Vasily Terskikh, Ekaterina Vorotelyak
Hair follicle (HF) reconstruction in vitro is a promising field in alopecia treatment and human HF development research. Here, we combined postnatal human dermal papilla (DP) cells and skin epidermal keratinocytes (KCs) in a hanging drop culture to develop an artificial HF germ. The method is based on DP cell hair-inducing properties and KC self-organization. We evaluated two protocols of aggregate assembling. Mixed HF germ-like structures demonstrated the initiation of epithelial-mesenchymal interaction, including WNT pathway activation and expression of follicular markers...
2017: Stem Cells International
https://www.readbyqxmd.com/read/29129736/role-of-d-galactose-induced-brain-aging-and-its-potential-used-for-therapeutic-interventions
#15
REVIEW
Thazin-Shwe, Wasana Pratchayasakul, Nipon Chattipakorn, Siriporn C Chattipakorn
Aging is a phenomenon that all living organisms inevitably face. Every year, 9.9million people, globally, suffer from dementia, an indicator of the aging brain. Brain aging is significantly associated with mitochondrial dysfunction. This is characterized by a decrease in the activity of respiratory chain enzymes and ATP production, and increased free radical generation, mitochondrial deoxyribonucleic acid (DNA) mutations, and impaired mitochondrial structures. To get a better understanding of aging and to prevent its effects on many organs, chronic systemic administration of D-galactose was used to artificially create brain senescence in animal models and established to be beneficial for studies of anti-aging therapeutic interventions...
November 9, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/29128769/erosion-induced-losses-of-carbon-nitrogen-phosphorus-and-heavy-metals-from-agricultural-soils-of-contrasting-organic-matter-management
#16
Pu Shi, Rainer Schulin
Water erosion on agricultural land preferentially carries away fine particles. Due to the generally high specific density of sorption sites of these particles, their displacement can be associated with substantial particle-bound transfer also of nutrients and pollutants with low solubility. Organic matter amendments can reduce soil erosion, but to what extent they affect the erosion-induced element losses has not been studied much. Here, we carried out field rainfall experiments on three pairs of soil plots (1...
November 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29128764/synthetic-and-non-synthetic-anthropogenic-fibers-in-a-river-under-the-impact-of-paris-megacity-sampling-methodological-aspects-and-flux-estimations
#17
Rachid Dris, Johnny Gasperi, Vincent Rocher, Bruno Tassin
Processed fibers are highly present in our daily life and can be either natural, artificial (regenerated cellulose) and synthetic (made with petrochemicals). Their widespread use lead inevitably to a high contamination of environment. Previous studies focus on plastic particles regardless of their type or shape as long as they are comprised between 330μm and 5mm. On the contrary, this study focuses exclusively on fibers using a smaller mesh size net (80μm) to sample freshwater. Moreover, all processed organic fibers are considered, irrespective to their nature...
November 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29128531/the-hierarchical-response-of-human-corneal-collagen-to-load
#18
J S Bell, S Hayes, C Whitford, J Sanchez-Weatherby, O Shebanova, C Vergari, C P Winlove, N Terrill, T Sorensen, A Elsheikh, K M Meek
Fibrillar collagen in the human cornea is integral to its function as a transparent lens of precise curvature, and its arrangement is now well-characterised in the literature. While there has been considerable effort to incorporate fibrillar architecture into mechanical models of the cornea, the mechanical response of corneal collagen to small applied loads is not well understood. In this study the fibrillar and molecular response to tensile load was quantified using small and wide angle X-ray scattering (SAXS/WAXS), and digital image correlation (DIC) photography was used to calculate the local strain field that gave rise to the hierarchical changes...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29128120/effects-of-agricultural-land-use-on-dissolved-organic-carbon-and-nitrogen-in-surface-runoff-and-subsurface-drainage
#19
Noora Manninen, Helena Soinne, Riitta Lemola, Laura Hoikkala, Eila Turtola
Dissolved organic carbon (DOC) load in discharges from cultivated soils may have negative impacts on surface waters. The magnitude of the load may vary according to soil properties or agricultural management practices. This study quantifies the DOC load of cultivated mineral soils and investigates whether the load is affected by agricultural practices. Discharge volumes and concentrations of DOC and dissolved organic nitrogen (DON) were continually measured at three sites from surface runoff and artificial subsurface drainage or from combined total discharge over a two-year period (2012-2014)...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29127860/human-embryonic-stem-cell-derived-cardiovascular-progenitor-cells-efficiently-colonize-in-bfgf-tethered-natural-matrix-to-construct-contracting-humanized-rat-hearts
#20
Sarah Rajabi, Sara Pahlavan, Mohammad Kazemi Ashtiani, Hassan Ansari, Saeed Abbasalizadeh, Forough Azam Sayahpour, Fahimeh Varzideh, Sawa Kostin, Nasser Aghdami, Thomas Braun, Hossein Baharvand
Bioengineering of whole hearts using human embryonic stem cells (hESCs)-derived cardiovascular progenitor cells (CPCs) and natural matrices is a promising approach to overcome organ donor shortage threatening millions of patients awaiting for heart transplantation. Here, we developed a novel strategy for generation of heart constructs by repopulating engineered decellularized rat hearts using hESCs-derived CPCs. Careful expansion of CPCs in a scalable stirred-suspension bioreactor combined with step-wise seeding (60 million cells in 3 steps of 20 million per 1...
November 1, 2017: Biomaterials
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