27,915 results match your criteria growth defect


Role of lysosomes in physiological activities, diseases, and therapy.

J Hematol Oncol 2021 May 14;14(1):79. Epub 2021 May 14.

Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, 610041, Sichuan, People's Republic of China.

Long known as digestive organelles, lysosomes have now emerged as multifaceted centers responsible for degradation, nutrient sensing, and immunity. Growing evidence also implicates role of lysosome-related mechanisms in pathologic process. In this review, we discuss physiological function of lysosomes and, more importantly, how the homeostasis of lysosomes is disrupted in several diseases, including atherosclerosis, neurodegenerative diseases, autoimmune disorders, pancreatitis, lysosomal storage disorders, and malignant tumors. Read More

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A multifunctional substance P-conjugated chitosan hydrochloride hydrogel accelerates full-thickness wound healing by enhancing synchronized vascularization, extracellular matrix deposition, and nerve regeneration.

Biomater Sci 2021 May 14. Epub 2021 May 14.

Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China.

Due to the native skin limitations and the complexity of reconstructive microsurgery, advanced biomaterials are urgently required to promote wound healing for severe skin defects caused by accidents and disasters. Accumulating evidence has supported that substance P (SP) has a potential effect on skin regeneration. However, SP application is seriously impeded by its poor stability and oxidative reactions occurring during production, transportation, and storage. Read More

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Exceptional Deformability of Wurtzite Zinc Oxide Nanowires with Growth Axial Stacking Faults.

Nano Lett 2021 May 14. Epub 2021 May 14.

School of Mechanical, Medical, and Process Engineering, Queensland University of Technology (QUT), Brisbane, Queensland 4001, Australia.

To ensure reliability and facilitate the strain engineering of zinc oxide (ZnO) nanowires (NWs), it is significant to understand their flexibility thoroughly. In this study, single-crystalline ZnO NWs with rich axial pyramidal I () and prismatic stacking faults (SFs) are synthesized by a metal oxidation method. Bending properties of the as-synthesized ZnO NWs are investigated at the atomic scale using an high-resolution transmission electron microscopy (HRTEM) technique. Read More

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Development of Zoledronic Acid Containing Biomaterials for Enhanced Guided Bone Regeneration.

J Pharm Sci 2021 May 10. Epub 2021 May 10.

Ankara University Faculty of Pharmacy Department of Pharmaceutical Technology, Ankara, Turkey.

In recent years, biomaterial-based treatments, also called guided bone regeneration (GBR), which aim to establish a bone regeneration site and prevent the migration of gingival connective tissue and / or peripheral epithelium through the defective area during periodontal surgical procedures have come to the fore. In this report, we have developed a nanoparticle bearing thermosensitive in situ gel formulation of Pluronic F127 and poly(D,L-lactic acid) based membrane to reveal their utilization at GBR by in-vivo applications. In addition, the encouragement of the bone formation in defect area via inhibition of osteoclastic activity is intended by fabrication these biodegradable biomaterials at a lowered Zoledronic Acid (ZA) dose. Read More

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Rational Passivation of Sulfur Vacancy Defects in Two-Dimensional Transition Metal Dichalcogenides.

ACS Nano 2021 May 13. Epub 2021 May 13.

University of Cambridge, Cambridge, CB2 1TN, U.K.

Structural defects vary the optoelectronic properties of monolayer transition metal dichalcogenides, leading to concerted efforts to control defect type and density materials growth or postgrowth passivation. Here, we explore a simple chemical treatment that allows on-off switching of low-lying, defect-localized exciton states, leading to tunable emission properties. Using steady-state and ultrafast optical spectroscopy, supported by calculations, we show that passivation of sulfur vacancy defects, which act as exciton traps in monolayer MoS and WS, allows for controllable and improved mobilities and an increase in photoluminescence up to 275-fold, more than twice the value achieved by other chemical treatments. Read More

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Modified surgical reconstruction technique for a rare isolated congenital sternal cleft: In a six -year-old child.

Ann Med Surg (Lond) 2021 May 14;65:102280. Epub 2021 Apr 14.

Department of Surgical Specialties, Maternity and Children Hospital, Dammam, Saudi Arabia.

We report the modified surgical reconstruction technique for correction for a large isolated congenital sternal cleft in 6 years old girl using a methyl methacrylate marlex mesh sandwich plate (MMS). The patient was referred to our tertiary care institution with a sizeable anterior chest wall bony defect. There was a large bulging under the skin due to protrusion of mediastinal viscera and visible cardiac pulsations with breathing. Read More

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Superconducting SrRuO Thin Films without Out-of-Phase Boundaries by Higher-Order Ruddlesden-Popper Intergrowth.

Nano Lett 2021 May 12. Epub 2021 May 12.

Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea.

Ruddlesden-Popper (RP) phases (O, = 1, 2,···) have attracted intensive research with diverse functionalities for device applications. However, the realization of a high-quality RP-phase film is hindered by the formation of out-of-phase boundaries (OPBs) that occur at terrace edges, originating from lattice mismatch in the -axis direction with the ''O ( = ∞) substrate. Here, using strontium ruthenate RP-phase SrRuO ( = 1) as a model system, an experimental approach for suppressing OPBs was developed. Read More

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Intra-articular Injection of Bevacizumab Enhances Bone Marrow Stimulation-Mediated Cartilage Repair in a Rabbit Osteochondral Defect Model.

Am J Sports Med 2021 May 12:3635465211005102. Epub 2021 May 12.

Center for Regenerative Sports Medicine at the Steadman Philippon Research Institute, Vail, Colorado, USA; Department of Orthopaedic Surgery, McGovern Medical School, University of Texas Health Science Center, Houston, Texas, USA.

Background: Bone marrow stimulation (BMS) via microfracture historically has been a first-line treatment for articular cartilage lesions. However, BMS has become less favorable because of resulting fibrocartilage formation. Previous studies have shown that angiogenesis blockade promotes cartilage repair. Read More

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Mycobacteria Tolerate Carbon Monoxide by Remodeling Their Respiratory Chain.

mSystems 2021 May 11;6(3). Epub 2021 May 11.

Department of Microbiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia

Carbon monoxide (CO) gas is infamous for its acute toxicity. This toxicity predominantly stems from its tendency to form carbonyl complexes with transition metals, thus inhibiting the heme-prosthetic groups of proteins, including respiratory terminal oxidases. While CO has been proposed as an antibacterial agent, the evidence supporting its toxicity toward bacteria is equivocal, and its cellular targets remain poorly defined. Read More

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Wound Healing by Allogeneic Transplantation of Specific Subpopulation From Human Umbilical Cord Mesenchymal Stem Cells.

Cell Transplant 2021 Jan-Dec;30:963689721993774

Cátedra de Citología, Histología y Embriología, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Buenos Aires, Argentina.

In normal physiological conditions, restoration of a functional epidermal barrier is highly efficient; nevertheless, when it fails, one of the main consequences is a chronic ulcerative skin defect, one of the most frequently recognized complications of diabetes. Most of these chronic venous ulcers do not heal with conventional treatment, leading to the appearance of infections and complications in the patient. Treatments based on the use of autologous mesenchymal stem cells (MSC) have been successful; however, its implementation entails complications. Read More

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A Biomimetic Macroporous Hybrid Scaffold with Sustained Drug Delivery for Enhanced Bone Regeneration.

Biomacromolecules 2021 May 10. Epub 2021 May 10.

Institute for Biomechanics, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.

Bone regeneration is a highly complex physiological process regulated by several factors. In particular, bone-mimicking extracellular matrix and available osteogenic growth factors such as bone morphogenetic protein (BMP) have been regarded as key contributors for bone regeneration. In this study, we developed a biomimetic hybrid scaffold (CEGH) with sustained release of BMP-2 that would result in enhanced bone formation. Read More

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An Elastic Mineralized 3D Electrospun PCL Nanofibrous Scaffold for Drug Release and Bone Tissue Engineering.

ACS Appl Bio Mater 2021 Apr 23;4(4):3639-3648. Epub 2021 Mar 23.

Department of Oral and Maxillofacial Surgery, Iowa Institute for Oral Health Research, University of Iowa College of Dentistry, Iowa City, IA 52242, USA.

Complex shaped and critical-sized bone defects have been a clinical challenge for many years. Scaffold-based strategies such as hydrogels provide localized drug release while filling complex defect shapes, but ultimately possess weaknesses in low mechanical strength alongside a lack of macroporous and collagen-mimicking nanofibrous structures. Thus, there is a demand for mechanically strong, extracellular matrix (ECM) mimicking scaffolds that can robustly fit complex shaped critical sized defects and simultaneously provide localized, sustained, multiple growth factor release. Read More

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Transforming Growth Factor-β3/Recombinant Human-like Collagen/Chitosan Freeze-Dried Sponge Primed With Human Periodontal Ligament Stem Cells Promotes Bone Regeneration in Calvarial Defect Rats.

Front Pharmacol 2021 23;12:678322. Epub 2021 Apr 23.

Institute of Biomedicine and Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China.

Patients with a skull defect are at risk of developing cerebrospinal fluid leakage and ascending bacterial meningitis at >10% per year. However, treatment with stem cells has brought great hope to large-area cranial defects. Having found that transforming growth factor (TGF)-β3 can promote the osteogenic differentiation of human periodontal ligament stem cells (hPDLSCs), we designed a hybrid TGF-β3/recombinant human-like collagen recombinant human collagen/chitosan (CS) freeze-dried sponge (TRFS) loading hPDLSCs (TRFS-h) to repair skull defects in rats. Read More

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Therapeutic tissue regenerative nanohybrids self-assembled from bioactive inorganic core / chitosan shell nanounits.

Biomaterials 2021 Apr 30;274:120857. Epub 2021 Apr 30.

Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, 31116, South Korea; Department of Nanobiomedical Science & BK21 NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, 31116, South Korea; Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, 31116, South Korea; Cell & Matter Institute, Dankook University, Cheonan, 31116, Republic of Korea; UCL Eastman-Korea Dental Medicine Innovation Centre, Dankook University, Cheonan, 31116, South Korea. Electronic address:

Natural inorganic/organic nanohybrids are a fascinating model in biomaterials design due to their ultra-microstructure and extraordinary properties. Here, we report unique-structured nanohybrids through self-assembly of biomedical inorganic/organic nanounits, composed of bioactive inorganic nanoparticle core (hydroxyapatite, bioactive glass, or mesoporous silica) and chitosan shell - namely Chit@IOC. The inorganic core thin-shelled with chitosan could constitute as high as 90%, strikingly contrasted with the conventional composites. Read More

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Tethered spinal cord among individuals with myelomeningocele: an analysis of the National Spina Bifida Patient Registry.

J Neurosurg Pediatr 2021 May 7:1-7. Epub 2021 May 7.

8Developmental Behavioral Pediatrics, Seattle Children's Hospital and University of Washington College of Medicine, Seattle, Washington.

Objective: The aims of this study were to review the National Spina Bifida Patient Registry (NSBPR) data set to study the rates of tethered spinal cord release (TCR) among patients with myelomeningocele and variability between centers, to compare TCR rates between males and females, and to study the relationships between TCR rates and other condition-specific characteristics.

Methods: The NSBPR registry was queried to identify all patients with myelomeningocele. TCR rates were calculated over time using survival analyses; rates between centers and between males and females were compared. Read More

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[Orbital Fractures in Children].

Acta Chir Orthop Traumatol Cech 2021 ;88(2):101-106

Klinika dětské otorinolaryngologie, Fakultní nemocnice Brno a Lékařská fakulta Masarykovy univerzity, Brno.

PURPOSE OF THE STUDY Diagnosis and treatment of fractures of the facial skeleton in children can be difficult due to the skeletal growth. MATERIAL AND METHODS The 9-year retrospective study included patients admitted with the orbital fracture diagnosis to the University Hospital Brno, Children s Hospital, Department of Paediatric ENT, Department of Paediatric Anaesthesiology and Resuscitation, and Department of Paediatric Surgery, Orthopaedics and Traumatology. We looked into the number of patients admitted to the hospital with the orbital fracture diagnosis and the cause of the injury, the age of patients, and the used treatment method - surgical or non-operative treatment were analysed. Read More

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Fast crystal growth at ultra-low temperatures.

Nat Mater 2021 May 6. Epub 2021 May 6.

State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.

It is believed that the slow liquid diffusion and geometric frustration brought by a rapid, deep quench inhibit fast crystallization and promote vitrification. Here we report fast crystal growth in charged colloidal systems under deep supercooling, where liquid diffusion is extremely low. By combining experiments and simulations, we show that this process occurs via wall-induced barrierless ordering consisting of two coupled steps: the step-like advancement of the rough interface that disintegrates frustration, followed by defect repairing inside the newly formed solid phase. Read More

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Clinical efficacy of amniotic membrane with biphasic calcium phosphate in guided tissue regeneration of intrabony defects- a randomized controlled clinical trial.

Biomater Res 2021 May 6;25(1):15. Epub 2021 May 6.

Department of Periodontology, Sri Ramachandra Institute of Higher Education and Research, Chennai, India.

Background: The concept of periodontal regeneration has been revolutionised since the introduction of growth factors and bioactive bone substitutes which ensures optimal regeneration of the diseased periodontium. The aim of the present study was to evaluate the efficacy of Amniotic membrane + Biphasic Calcium phosphate as compared to Collagen membrane + Biphasic Calcium phosphate for the management of periodontal intrabony defects.

Methods: 50 systemically healthy patients with localised moderate to severe periodontitis, sites which had a Probing Pocket Depth (PPD) ≥ 6 mm and an intrabony component of ≥ 3 mm as detected on Intra oral periapical radiographs (IOPAR) and bone sounding were recruited based on specific inclusion and exclusion criteria. Read More

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Oriented-Attachment- and Defect-Dependent PbTe Quantum Dots Growth: Shape Transformations Supported by Experimental Insights and DFT Calculations.

Inorg Chem 2021 May 6. Epub 2021 May 6.

Tecnológico Nacional de México, Instituto Tecnológico Superior de Ciudad Hidalgo, Av. Ing. Carlos Rojas Gutiérrez 2120, Fracc. Valle de la herradura, Ciudad Hidalgo 61100, Michoacán, Mexico.

High-resolution transmission electron microscopy results reveal that oriented-attachment- and defect-dependent mechanisms rule the size and shape evolution of the monodispersed PbTe quantum dots (QDs). The former is characterized by the growth of quasi-cubic PbTe QDs, which depends on both the geometric constraints imposed by the {200} facets and the defect-free lattice, while the latter one is a defect-dependent mechanism which gives way to the formation of decahedral PbTe QDs (∼6 nm). Experimentally, formaldehyde is an important parameter for the mechanochemical synthesis of monodispersed PbTe QDs, which has not been studied until now. Read More

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Transferrin receptor 1 ablation in satellite cells impedes skeletal muscle regeneration through activation of ferroptosis.

J Cachexia Sarcopenia Muscle 2021 May 6. Epub 2021 May 6.

Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China.

Background: Satellite cells (SCs) are critical to skeletal muscle regeneration. Inactivation of SCs is linked to skeletal muscle loss. Transferrin receptor 1 (Tfr1) is associated with muscular dysfunction as muscle-specific deletion of Tfr1 results in growth retardation, metabolic disorder, and lethality, shedding light on the importance of Tfr1 in muscle physiology. Read More

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Genetic Analysis of Sirtuin Deacetylases in Hyphal Growth of .

mSphere 2021 May 5;6(3). Epub 2021 May 5.

Department of Biological Sciences, State University of New York at Buffalo, Buffalo, New York, USA

is a major human fungal pathogen that encounters varied host environments during infection. In response to environmental cues, switches between ovoid yeast and elongated hyphal growth forms, and this morphological plasticity contributes to virulence. Environmental changes that alter the cell's metabolic state could be sensed by sirtuins, which are NAD-dependent deacetylases. Read More

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[Lateral ridge augmentation with autologous dentin from the wisdom tooth - A case report].

Swiss Dent J 2021 May;131(5):425-430

Klinik für Mund-, Kiefer- und Gesichtschirurgie - Poliklinik für Oralchirurgie, Zentrum für Zahnmedizin der Universität Zürich.

Autologous dentin as a bone substitute can be used in regenerative dentistry. Extracted teeth are not discarded but recycled and used in block or particulate form for lateral ridge augmentation before implant insertion. Due to the growth factors contained in the dentin and the autologous origin, a stable and good osseointegration of the augmentation material can be expected. Read More

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Comparative efficacy of resorbable fiber wraps loaded with gentamicin sulfate or gallium maltolate in the treatment of osteomyelitis.

J Biomed Mater Res A 2021 May 5. Epub 2021 May 5.

Department of Biomedical Engineering, The University of Texas, Austin, Texas, USA.

The high incidence of osteomyelitis associated with critical-sized bone defects raises clinical challenges in fracture healing. Clinical use of antibiotic-loaded bone cement as an adjunct therapy is limited by incompatibility with many antimicrobials, sub-optimal release kinetics, and requirement of surgical removal. Furthermore, overuse of antibiotics can lead to bacterial modifications that increase efflux, decrease binding, or cause inactivation of the antibiotics. Read More

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3D Printing Unique Nanoclay-Incorporated Double-Network Hydrogels for Construction of Complex Tissue Engineering Scaffolds.

Adv Healthc Mater 2021 May 5:e2100036. Epub 2021 May 5.

Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.

The development of new biomaterial inks with good structural formability and mechanical strength is critical to the fabrication of 3D tissue engineering scaffolds. For extrusion-based 3D printing, the resulting 3D constructs are essentially a sequential assembly of 1D filaments into 3D constructs. Inspired by this process, this paper reports the recent study on 3D printing of nanoclay-incorporated double-network (NIDN) hydrogels for the fabrication of 1D filaments and 3D constructs without extra assistance of support bath. Read More

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Biomechanical and Mechanostat analysis of a titanium layered porous implant for mandibular reconstruction: The effect of the topology optimization design.

Mater Sci Eng C Mater Biol Appl 2021 May 24;124:112056. Epub 2021 Mar 24.

College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China; Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou 310023, China; National International Joint Research Center of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Hangzhou 310023, China.

A porous scaffold/implant is considered a potential method to repair bone defects, but its mechanical stability and biomechanics during the repair process are not yet clear. A mandibular titanium implant was proposed and designed with layered porous structures similar to that of the bone tissue, both in structure and mechanical properties. Topology was used to optimize the design of the porous implant and fixed structure. Read More

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Three-dimensional bioactive hydrogel-based scaffolds for bone regeneration in implant dentistry.

Mater Sci Eng C Mater Biol Appl 2021 May 24;124:112055. Epub 2021 Mar 24.

Centre for Craniofacial and Regenerative Biology, Guy's Hospital, King's College London, SE1 9RT, UK. Electronic address:

Bone tissue requires a range of complex mechanisms to allow the restoration of its structure and function. Bone healing is a signaling cascade process, involving cells secreting cytokines, growth factors, and pro-inflammatory factors in the defect site that will, subsequently, recruit surrounding stem cells to migrate, proliferate, and differentiate into bone-forming cells. Bioactive functional scaffolds could be applied to improve the bone healing processes where the organism is not able to fully regenerate the lost tissue. Read More

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Congenital Uterine Anomaly and Pelvic Organ Prolapse: A Rare Case of Pelvic Organ Prolapse in a Complete Bicornuate Uterus with Successful Pregnancy Outcomes Undiagnosed until the Time of Sacrocolpopexy.

Authors:
Gina Nam Sa Ra Lee

J Menopausal Med 2021 Apr;27(1):32-36

Department of Obstetrics and Gynecology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.

Müllerian development anomalies (MDAs) are most commonly diagnosed in the reproductive period. A bicornuate uterus is the result of a fusion defect of the Müllerian ducts, causing an abnormal fundal outline. Most of the cases are diagnosed early in life and present with obstetrical complications, such as recurrent pregnancy loss, preterm birth, intrauterine growth restriction, placental abruption, and cervical incompetence. Read More

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Bi-allelic KARS1 pathogenic variants affecting functions of cytosolic and mitochondrial isoforms are associated with a progressive and multisystem disease.

Hum Mutat 2021 May 3. Epub 2021 May 3.

Department of Translational Medicine, Federico II University, Naples, Italy.

KARS1 encodes a lysyl-transfer RNA synthetase (LysRS) that links lysine to its cognate transfer RNA. Two different KARS1 isoforms exert functional effects in cytosol and mitochondria. Bi-allelic pathogenic variants in KARS1 have been associated to sensorineural hearing and visual loss, neuropathy, seizures, and leukodystrophy. Read More

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Low dimensional inorganic tin perovskite solar cells by a template growth.

Angew Chem Int Ed Engl 2021 May 3. Epub 2021 May 3.

ShanghaiTech University, 100 Haike Road, Shanghai, CHINA.

The manipulation of the dimensionality and nanostructures based on precise control of the crystal growth kinetics boosts the flourishing development of perovskite optoelectronic materials and devices. Herein, a low-dimensional inorganic tin halide perovskite CsSnBrI2-x(SCN)x with mixed 2D and 3D structure is fabricated. Kinetic study indicates that Sn(SCN)2 and phenylethylamine hydroiodate can form 2D perovskite structure that acts as a template for the growth of 3D perovskite CsSnBrI2-x(SCN)x. Read More

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In ovariectomy-induced osteoporotic rat models, BMP-2 substantially reversed an impaired alveolar bone regeneration whereas PDGF-BB failed.

Clin Oral Investig 2021 May 3. Epub 2021 May 3.

Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehakno, Jongno-gu, Seoul, 03080, Korea.

Objectives: We previously suggested an ovariectomy (OVX)-induced osteoporotic rat model showing an impaired alveolar bone defect healing. This study aimed to evaluate and compare the effects of recombinant human bone morphogenetic protein-2 (rhBMP-2) and recombinant human platelet-derived growth factor-BB (rhPDGF-BB) on alveolar bone defect healing in OVX-induced osteoporotic rats.

Materials And Methods: A total of forty-one female rats were divided into four groups: a collagen group (n=10), a PDGF-BB group (n=11), a BMP-2 group (n=10), and a control group (n=10). Read More

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