1,076 results match your criteria primary layered

Tissue Engineering of Corneal Stroma via Melt Electrowriting.

J Tissue Eng Regen Med 2021 Jul 29. Epub 2021 Jul 29.

Ocular Surface Center, Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA.

The cornea serves as the main refractive component of the eye with the corneal stroma constituting the thickest component in a stratified layered system of epithelia, stroma and endothelium. Current treatment options for patients suffering from corneal diseases are limited to transplantation of a human donor cornea (keratoplasty) or to implantation of an artificial cornea (keratoprosthesis). Nevertheless, donor shortage and failure of artificial corneas to integrate with local tissue constitute important problems that have not been yet circumvented. Read More

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Streamlining brain tumor surgery care during the COVID-19 pandemic: A case-control study.

PLoS One 2021 29;16(7):e0254958. Epub 2021 Jul 29.

Pacific Neuroscience Institute, Providence Saint John's Health Center, Santa Monica, California, United States of America.

Background: The COVID-19 pandemic forced a reconsideration of surgical patient management in the setting of scarce resources and risk of viral transmission. Herein we assess the impact of implementing a protocol of more rigorous patient education, recovery room assessment for non-ICU admission, earlier mobilization and post-discharge communication for patients undergoing brain tumor surgery.

Methods: A case-control retrospective review was undertaken at a community hospital with a dedicated neurosurgery and otolaryngology team using minimally invasive surgical techniques, total intravenous anesthesia (TIVA) and early post-operative imaging protocols. Read More

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Accessing the Anisotropic Nonthermal Phonon Populations in Black Phosphorus.

Nano Lett 2021 Jul 19;21(14):6171-6178. Epub 2021 Jul 19.

Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.

We combine ultrafast electron diffuse scattering experiments and first-principles calculations of the coupled electron-phonon dynamics to provide a detailed momentum-resolved picture of lattice thermalization in black phosphorus. The measurements reveal the emergence of highly anisotropic nonthermal phonon populations persisting for several picoseconds after exciting the electrons with a light pulse. Ultrafast dynamics simulations based on the time-dependent Boltzmann formalism are supplemented by calculations of the structure factor, defining an approach to reproduce the experimental signatures of nonequilibrium structural dynamics. Read More

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Engineering 3D Cortical Spheroids for an Ischemic Stroke Model.

ACS Biomater Sci Eng 2021 Jul 19. Epub 2021 Jul 19.

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Daejeon 34141, Republic of Korea.

Three-dimensional (3D) spheroids composed of brain cells have shown great potential to mimic the pathophysiology of the brain. However, a 3D spheroidal brain-disease model for cerebral ischemia has not been reported. This study investigated an ultralow attachment (ULA) surface-mediated formation of 3D cortical spheroids using primary rat cortical cells to recapitulate the cerebral ischemic responses in stroke by oxygen-glucose deprivation-reoxygenation (OGD-R) treatment. Read More

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Influence of Cortical Layer and Surgical Techniques on the Primary Implant Stability in Low-density Bone: An Study.

J Contemp Dent Pract 2021 Feb 1;22(2):146-151. Epub 2021 Feb 1.

Department of Prosthodontics, Ragas Dental College and Hospital, Chennai, Tamil Nadu, India.

Aim: This study aimed at evaluating the influence of cortical layer and surgical techniques on the primary stability of implants in low-density bone.

Materials And Methods: Two solid rigid polyurethane blocks with a density equivalent to 0.32 g/cm simulating cancellous bone were used. Read More

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February 2021

Bayesian Structure Learning in Multi-layered Genomic Networks.

J Am Stat Assoc 2021 24;116(534):605-618. Epub 2020 Jul 24.

Department of Biostatistics, University of Michigan.

Integrative network modeling of data arising from multiple genomic platforms provides insight into the holistic picture of the interactive system, as well as the flow of information across many disease domains including cancer. The basic data structure consists of a sequence of hierarchically ordered datasets for each individual subject, which facilitates integration of diverse inputs, such as genomic, transcriptomic, and proteomic data. A primary analytical task in such contexts is to model the layered architecture of networks where the vertices can be naturally partitioned into ordered layers, dictated by multiple platforms, and exhibit both undirected and directed relationships. Read More

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Alkali metal salts of 4-hydroxybenzoic acid: a structural and educational study.

Acta Crystallogr C Struct Chem 2021 Jul 9;77(Pt 7):340-353. Epub 2021 Jun 9.

Scotch College, 1 Morrison Street, Hawthorn, VIC 3122, Australia.

As part of an educational exercise designed to introduce school students to the technique of single-crystal X-ray diffraction and enhance their understanding of primary and secondary bonding, a group of nine secondary school students was given the opportunity to prepare new compounds and to solve and refine data collected on the crystalline materials they had prepared. Their investigation of the alkali metal salts of 4-hydroxybenzoic acid (Hhba) yielded nine new compounds and their structures are described in this article. Whilst the salts might be expected to have similar atomic arrangements, there are significant differences in their structures. Read More

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Apoplasmic barrier in the extrafloral nectary of Citharexylum myrianthum (Verbenaceae).

Planta 2021 Jul 3;254(2):19. Epub 2021 Jul 3.

Department of Biostatistics, Plant Biology, Parasitology and Zoology, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.

Main Conclusion: The cytological changes underlying the formation of an apoplasmic barrier in the multi-layered extrafloral nectaries of Citharexylum myrianthum are compatible with the synthesis, transport and deposition of suberin. In terms of ontogenesis and function, the intermediate layers of these nectaries are homologous with the stalks of nectar-secreting trichomes. Anticlinal cell wall impregnations are common in trichomatic nectaries and their functions as endodermis-like barriers have been discussed because of possible direct effects on the nectary physiology, mainly in the nectar secretion and resorption. Read More

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Family Physician Perceptions of Climate Change, Migration, Health, and Healthcare in Sub-Saharan Africa: An Exploratory Study.

Int J Environ Res Public Health 2021 06 11;18(12). Epub 2021 Jun 11.

Department of Economics-CESSMIR, Ghent University, UNU-CRIS, B-9000 Ghent, Belgium.

Although family physicians (FPs) are community-oriented primary care generalists and should be the entry point for the population's interaction with the health system, they are underrepresented in research on the climate change, migration, and health(care) nexus (hereafter referred to as the nexus). Similarly, FPs can provide valuable insights into building capacity through integrating health-determining sectors for climate-resilient and migration-inclusive health systems, especially in Sub-Saharan Africa (SSA). Here, we explore FPs' perceptions on the nexus in SSA and on intersectoral capacity building. Read More

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Chiral Mesostructured BiOBr Films with Circularly Polarized Colour Response.

Angew Chem Int Ed Engl 2021 Jul 1. Epub 2021 Jul 1.

School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P. R. China.

Achieving strong and broadband circularly polarized colour responses in chiral inorganic materials is challenging. Here, we fabricated chiral mesostructured bismuth oxybromide (BiOBr) films (CMBFs) via hydrothermal growth using chiral sugar alcohols as symmetry-breaking agents. The layered slabs of BiOBr crystals with weak van-der-Waals interactions are prone to mismatching due to the chiral driving force, resulting in hierarchically chiral arrangements of fine size. Read More

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Implementation of SARS-CoV2 Screening in K-12 Schools using In-School Pooled Molecular Testing and Deconvolution by Rapid Antigen Test.

J Clin Microbiol 2021 Jun 30:JCM0112321. Epub 2021 Jun 30.

Broad Institute of MIT and Harvard, Cambridge, MA, USA.

SARS-CoV2 testing is one component of a multi-layered mitigation strategy to enable safe in-person school attendance for the K-12 school population. However, costs, logistics, and uncertainty about effectiveness are potential barriers to implementation. We assessed early data from the Massachusetts K-12 public school pooled SARS-CoV2 testing program, which incorporates two novel design elements: in-school "pod pooling" for assembling pools of dry anterior nasal swabs from 5-10 individuals, and positive pool deconvolution using the BinaxNOW antigen rapid diagnostic test (Ag RDT), to assess the operational and analytical feasibility of this approach. Read More

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Nano-layered surface plasmon resonance-based highly sensitive biosensor for virus detection: A theoretical approach to detect SARS-CoV-2.

AIP Adv 2021 Jun 14;11(6):065023. Epub 2021 Jun 14.

Department of Electrical and Electronic Engineering, Khulna University of Engineering and Technology, Khulna 9203, Bangladesh.

The outbreak of the coronavirus disease (COVID-19) pandemic has become a worldwide health catastrophe instigated by Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2). Countries are battling to slow the spread of this virus by testing and treating patients, along with other measures such as prohibiting large gatherings, maintaining social distance, and frequent, thorough hand washing, as no vaccines or medicines are available that could effectively treat infected people for different types of SARS-CoV-2 variants. However, the testing procedure to detect this virus is lengthy. Read More

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Advances in Rare-Earth Tritelluride Quantum Materials: Structure, Properties, and Synthesis.

Adv Sci (Weinh) 2021 Jun 19;8(12):e2004762. Epub 2021 Mar 19.

School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA.

A distinct class of 2D layered quantum materials with the chemical formula of RTe (R = lanthanide) has gained significant attention owing to the occurrence of collective quantum states, superconductivity, charge density waves (CDW), spin density waves, and other advanced quantum properties. To study the Fermi surface nesting driven CDW formation, the layered RTe family stages an excellent low dimensional genre system. In addition to the primary energy gap feature observed at higher energy, optical spectroscopy study on some RTe evidence a second CDW energy gap structure indicating the occurrence of multiple CDW ordering even with light and intermediate RTe compounds. Read More

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Optimal timing of delivery for pregnancies with prenatally diagnosed congenital diaphragmatic hernia: a propensity-score analysis using the inverse probability of treatment weighting.

J Perinatol 2021 Jun 14. Epub 2021 Jun 14.

Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan.

Objective: To evaluate the optimal timing of neonates with prenatally diagnosed congenital diaphragmatic hernia (CDH).

Methods: Data from a retrospective cohort study conducted by the Japanese CDH Study Group between 2011 and 2018 were divided into two groups according to delivery timing: 36-37 and 38-41 weeks of gestation (wg). Death before 90 days as the primary outcome and the duration of hospitalization, oxygen therapy and tube feeding at discharge as the secondary outcomes were analyzed with generalized linear model applying inverse probability of treatment weighting method. Read More

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The Lesser Tuberosity Osteotomy Exposure for Total Shoulder Arthroplasty.

JBJS Essent Surg Tech 2021 Jan-Mar;11(1). Epub 2021 Feb 11.

Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY.

Background: The lesser tuberosity osteotomy (LTO) is a commonly employed technique for mobilizing the subscapularis tendon during anatomic total shoulder arthroplasty that is performed through a deltopectoral approach. During this procedure, the lesser tuberosity is osteotomized from the proximal aspect of the humerus while maintaining the strong tendon-to-bone attachment of the subscapularis tendon insertion. After the shoulder arthroplasty is performed, the lesser tuberosity osseous fragment is then resecured to the proximal aspect of the humerus with heavy nonabsorbable suture, which allows for direct bone-to-bone compression and healing of the fragment to the proximal aspect of the humerus. Read More

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February 2021

Modeling and simulation of static component generation of Lamb wave propagation in a layered plate.

Ultrasonics 2021 May 28;116:106473. Epub 2021 May 28.

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China. Electronic address:

Modeling of the acoustic-radiation-induced static component (SC) generation of primary Lamb wave tone burst propagating in a layered plate is conducted. Accompanying the propagation of primary Lamb wave tone burst, there are the finite-duration SC bulk driving force in the interior of the layered plate, and the finite-duration SC traction stress on each surface/interface. According to the modal analysis approach for waveguide excitation, the function of the finite-duration SC bulk driving force and traction stress is to generate the finite-duration SC of primary Lamb wave tone burst. Read More

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Adsorption-Reaction Processes Between Gelatin and PDMS-E Emulsion Droplets.

ACS Omega 2021 Jun 20;6(21):13915-13925. Epub 2021 May 20.

Shandong Provincial Key Laboratory of Molecular Engineering, School of Mathematics and Statistics, Qilu University of Technology Library, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, P. R. China.

In this work, the effects of droplet size and reaction time on the adsorption-reaction processes between gelatin and α-[3-(2,3-epoxypropoxy) propyl]-ω-butyl-polydimethylsiloxane (PDMS-E) emulsion droplets were studied. Gelatin molecules were only physically adsorbed on the surface of the PDMS-E droplet in the 0-75 min range, which was unrelated to the droplet size (100-1000 nm). For the small-size droplets (<410 nm), the physical adsorption proceeded over 75 min followed by agglomeration. Read More

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Use of double-layered covered esophageal stents in post-surgical esophageal leaks and esophageal perforation: Our experience.

Gastroenterol Hepatol 2021 May 27. Epub 2021 May 27.

Servicio de Aparato Digestivo, Hospital Universitario Miguel Servet, Zaragoza, España.

Introduction: The use of esophageal stents for the endoscopic management of esophageal leaks and perforations has become a usual procedure. One of its limitations is its high migration rate. To solve this incovenience, the double-layered covered esophageal stents have become an option. Read More

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Three-dimensional coculture provides an improved in vitro model for papillary renal cell carcinoma.

Am J Physiol Renal Physiol 2021 Jul 24;321(1):F33-F46. Epub 2021 May 24.

Department of Chemistry and Biochemistry, Calvin University, Grand Rapids, Michigan.

Papillary renal cell carcinoma (pRCC) represents the second most common kidney cancer and can be distinguished from other types based on its unique histological architecture and specific pattern of genomic alterations. Sporadic type 1 pRCC is almost universally driven by focal or chromosomal amplification of the receptor tyrosine kinase MET, although the specific mode of its activation is unclear. Although the MET receptors found in human tumor specimens appear highly active, those found on the surface of in vitro-cultured tumor cells are only weakly activated in the absence of exogenous hepatocyte growth factor ligand. Read More

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Roughly Spherical: Tailored PMMA-SiO Composite Supraparticles with Optimized Powder Flowability for Additive Manufacturing.

ACS Appl Mater Interfaces 2021 Jun 21;13(21):25334-25345. Epub 2021 May 21.

Institute of Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstrasse 4, Erlangen 91058, Germany.

Particulate materials with well-engineered properties are of key importance for many aspects in our daily life. Polymer powders with high flowability, for example, play a crucial role in the emerging field of powder-based additive manufacturing processes. However, the polymer- and composite material selection for these technologies is still limited. Read More

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The European bifurcation club Left Main Coronary Stent study: a randomized comparison of stepwise provisional vs. systematic dual stenting strategies (EBC MAIN).

Eur Heart J 2021 May 18. Epub 2021 May 18.

Institute Cardiovasculaire Paris Sud, Massy, France.

Background: Patients with non-left-main coronary bifurcation lesions are usually best treated with a stepwise provisional approach. However, patients with true left main stem bifurcation lesions have been shown in one dedicated randomized study to benefit from systematic dual stent implantation.

Methods And Results: Four hundred and sixty-seven patients with true left main stem bifurcation lesions requiring intervention were recruited to the EBC MAIN study in 11 European countries. Read More

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Two-Dimensional π-Conjugated Frameworks as a Model System to Unveil a Multielectron-Transfer-Based Energy Storage Mechanism.

Acc Chem Res 2021 Aug 15;54(15):3003-3015. Epub 2021 May 15.

Research Center for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

ConspectusAlthough electrochemical energy storage is commonplace in our society, further advancements in this technology are indispensable for the transition to a low-carbon society. Recent intensive research has expanded concepts in this field; however, finding one suitable material to obtain a high energy density accomplishing the criteria of next-generation batteries is still a conundrum. To solve this issue, material investigations based on big data combined with artificial intelligence are a present trend. Read More

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The effect of microstructure on mechanical properties of corn cob.

Micron 2021 Jul 20;146:103070. Epub 2021 Apr 20.

Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China; College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China.

As a natural biomass resource, corn cob has excellent mechanical properties and a special layered structure. To investigate the relationship between the mechanical properties and microstructure of corn cob, the ultra-deep field 3D microscope was used to characterize the macro geometric parameters, and the scanning electron microscopy (SEM) was observe the microstructure of the corn cob. The Fourier transform infrared spectrometer was used to analyze the fiber composition, revealing the contribution of fiber composition to the mechanical properties. Read More

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Structural and mechanical characterization of biofilm-associated bacterial polymer in the emulsification of petroleum hydrocarbon.

3 Biotech 2021 May 25;11(5):239. Epub 2021 Apr 25.

Laboratory of Environmental Microbiology and Ecology (LEnME), Department of Life Science, National Institute of Technology, Rourkela, Odisha 769 008 India.

The marine bacterium PPS-19 isolated from the oil-polluted site of Paradip port, Odisha, India, was found to form a strong biofilm in 2% (v/v) crude oil. Confocal Laser Scanning Microscopy (CLSM) revealed biofilm components along with multi-layered dense biofilm of rod-shaped cells with 64.7 µm thickness. Read More

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Transvaginal primary layered repair of postsurgical urethrovaginal fistula.

Int Urogynecol J 2021 Jul 5;32(7):1941-1943. Epub 2021 May 5.

ASST Monza, Ospedale San Gerardo, via G.B. Pergolesi, 33 20900, Monza, Italy.

Introduction And Hypothesis: Urethrovaginal fistula (UVF) is a rare disorder, which implies the presence of an abnormal communication between the urethra and the vagina.

Methods: Surgical repair options include transurethral, transabdominal and transvaginal procedures, either with or without tissue interposition. The vaginal route is considered a safe and effective option to correct UVF. Read More

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Formation and Function of the Primary Tube During Settlement and Metamorphosis of the Marine Polychaete (Haswell, 1883) (Serpulidae).

Biol Bull 2021 04 14;240(2):82-94. Epub 2021 Apr 14.

AbstractThe serpulid polychaete has emerged as a major model organism for studies of marine invertebrate settlement and metamorphosis and for processes involved in marine biofouling. Rapid secretion of an enveloping, membranous, organic primary tube provides settling larvae of firm adhesion to a surface and a refuge within which to complete metamorphosis. While this tube is never calcified, it forms the template from which the calcified tube is produced at its anterior end. Read More

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Evaluation of Wood Composite Sandwich Panels as a Promising Renewable Building Material.

Materials (Basel) 2021 Apr 20;14(8). Epub 2021 Apr 20.

Department of Civil and Environmental Engineering and Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA.

During this study, full-size wood composite sandwich panels, 1.2 m by 2.4 m (4 ft by 8 ft), with a biaxial corrugated core were evaluated as a building construction material. Read More

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Spaghetti wrist: Transverse injury, axial incision, layered microsurgical reconstruction.

Injury 2021 Apr 7. Epub 2021 Apr 7.

Department of Orthopaedic Surgery, Faculty of Medicine, University of Thessaly, 3 Panepistimiou St, Biopolis41500Larissa, Greece; Hand, Upper Extremity and Microsurgery Department, IASO Thessalias, Nikaia41500Larissa, Greece. Electronic address:

Introduction: Among various patterns of complex injuries of the wrist and forearm, "spaghetti wrist" refers to an extensive volar forearm laceration, in which several of the 12 tendons, 2 major nerves and 2 major arteries are transected, leading to lifelong disability and psychological, social and economic consequences. The aim of the study is to emphasize the keynote principles for the management of these injuries through retrospective review of a large group of patients treated by a team of experienced hand surgeons.

Material-methods: Data were retrospectively obtained for 61 patients (49 males and 12 females with average age of 34. Read More

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High capacity aqueous phosphate reclamation using Fe/Mg-layered double hydroxide (LDH) dispersed on biochar.

J Colloid Interface Sci 2021 Sep 24;597:182-195. Epub 2021 Mar 24.

Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA. Electronic address:

Phosphate is a primary plant nutrient, serving integral role in environmental stability. Excessive phosphate in water causes eutrophication; hence, phosphate ions need to be harvested from soil nutrient levels and water and used efficiently. Fe-Mg (1:2) layered double hydroxides (LDH) were chemically co-precipitated and widely dispersed on a cheap, commercial Douglas fir biochar (695 m/g surface area and 0. Read More

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September 2021

Addressing Unfavorable Influence of Particle Cracking with a Strengthened Shell Layer in Ni-Rich Cathodes.

ACS Appl Mater Interfaces 2021 Apr 15;13(16):18954-18960. Epub 2021 Apr 15.

Materials Genome Institute of Shanghai University, Shanghai 200444, China.

Ni-rich layered materials are widely accepted as pivotal cathode materials to realize low-cost high-energy-density batteries. However, they still suffer from the intrinsic mechanically induced degradation due to the large lattice deformation. Here, we fabricate a strengthened shell layer on polycrystalline secondary particles to address the unfavorable influence of particle cracking instead of suppressing their bulky pulverization. Read More

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