Failure Analysis of Girth Weld Cracking in Gas Transmission Pipelines Subjected to Ground Subsidence and Traffic Loads.

Girth welds are weak points in pipelines, and failures occur frequently. In a gas transmission pipeline, a girth weld experienced cracking, prompting a failure analysis using experimental methods and finite element analysis (FEA). Experimental results showed that X-ray non-destructive testing (NDT) revealed cracks, porosity, and lack of fusion in the girth weld.

The emerging role of fibrin(ogen) in cardiovascular disease.

Objective: A coagulation factor called fibrinogen is produced by the liver and is proteolyzed by thrombin to become fibrin. The latest studies have revealed that fibrin(ogen) palys an essential role in the regulation of cardiovascular disease. Understanding the relationship and mechanism between fibrin(ogen) and cardiovascular disease is of great significance for maintaining overall health.

Synthesis and antimicrobial studies of cadasides analogues via on-resin esterification.

A series of cadasides analogues have been prepared via a combination of solid-phase peptide synthesis and solution-phase cyclization. Primary structure-activity relationship studies of cadasides have also been established and revealed the critical roles of unnatural amino acid residues, which will facilitate the further development of cadasides analogues with improved antimicrobial activities.

A large-cohort study of 2971 cases of epulis: focusing on risk factors associated with recurrence.

Background: To analyze the clinicopathological features of different histological subtypes of epulis, and evaluate the risk factors associated with recurrence.

Materials And Methods: A retrospective study including 2971 patients was performed. The patients' sex, age, location, size, histological subtypes, recurrence information, oral hygiene habits, periodontitis symptoms and smoking history were retrieved from the patient medical records and follow-up information.

Periodontal Guided Tissue Regeneration Membranes: Limitations and Possible Solutions for the Bottleneck Analysis.

Guided tissue regeneration (GTR) is an important surgical method for periodontal regeneration. By placing barrier membrane on the root surface of the tooth to guide the adhesion and proliferation of periodontal ligament cells, periodontal tissue regeneration can be achieved. This review intends to analyze the current limitations of GTR membranes and to propose possible solutions for developing new ones.

Lipidomic analysis reveals altered lipid profiles of gingival tissues with periodontitis.

Aim: The role of lipids in periodontitis has not been well studied. Thus, this study aimed to explore periodontitis-associated lipid profile changes and identify differentially expressed lipid metabolites in gingival tissues.

Materials And Methods: Gingival tissues from 38 patients with periodontitis (periodontitis group) and 38 periodontally healthy individuals (control group) were collected.

A novel cone-beam CT scanning technique for measuring periodontal soft tissues in the esthetic area.

Purpose: This study investigated and tested a novel cone-beam computed tomography (CBCT) scanning technique capable of obtaining clear contours of soft tissues in the esthetic area.

Methods: Twenty-three periodontally healthy participants underwent this novel CBCT scanning technique. Soft tissue morphological parameters were measured on the CBCT images obtained.

High expression of aryl hydrocarbon receptor (AhR) plays an important role in the formation of fibrous epulis.

Objectives: Epulis is considered to be a massive reactive lesion rather than a true neoplasia. AhR is thought to be associated with inflammation and development of neoplasms. Here, we aimed to observe the expression of AhR in fibrous epulis and explore its role and possible mechanism in the pathogenesis of epulis.

Evaluation of polydimethylsiloxane-based substrates for in vitro culture of human periodontal ligament cells.

Periodontal ligament (PDL) cells are regarded as the cell type with the highest potential for periodontal regeneration. Biophysical cues of the culture substrate are increasingly identified as vital parameters to affect cell behavior. Compared to traditional tissue culture polystyrene (TCPS), polydimethylsiloxane (PDMS) substrates corroborate more closely the elastic modulus values of the physiological environment.

Structural Parameters Optimization of Elastic Cell in a Near-Bit Drilling Engineering Parameters Measurement Sub.

The downhole engineering parameters measurement sub is a key component of the rotary steerable drilling system. To enable a measurement sub to serve reliably under downhole complex conditions, the structural parameters optimization of its key but weak elastic cell is systematically studied. First, the multiple relations among measurement sensitivities, structural stiffnesses, and strength during structural parameters design are summarized.

Formation of Human Periodontal Ligament Cell Spheroids on Chitosan Films.

Periodontal ligament (PDL) cells hold great promise for periodontal tissue regeneration. Conventionally, PDL cells are cultured on two-dimensional (2D) substrates such as tissue culture polystyrene (TCPS). However, characteristic changes of PDL cells have been observed during in vitro culture.

An unexpected dual-response pH probe based on acridine.

A new pH fluorescent probe 2,8-bis(acridin-9-ylethynyl)-6,12-5,11-methanodibenzo[,][1,5]diazocine (TBN), which has two acridine moieties attached to Tröger's base, is a useful fluorescent probe for monitoring extreme acidic and alkaline pH. TBN displays an excellent pH dependent behavior and responds linearly to extreme conditions in the pH ranges of 1.4-3.

Push Force Analysis of Anchor Block of the Oil and Gas Pipeline in a Single-Slope Tunnel Based on the Energy Balance Method.

In this paper, a single-slope tunnel pipeline was analysed considering the effects of vertical earth pressure, horizontal soil pressure, inner pressure, thermal expansion force and pipeline-soil friction. The concept of stagnation point for the pipeline was proposed. Considering the deformation compatibility condition of the pipeline elbow, the push force of anchor blocks of a single-slope tunnel pipeline was derived based on an energy method.

Cell-Based Approaches in Periodontal Regeneration: A Systematic Review and Meta-Analysis of Periodontal Defect Models in Animal Experimental Work.

Various cell types have been assessed for experimental periodontal tissue regeneration in a variety of animal models. Nonetheless, the efficacy of cell-based approaches for periodontal regeneration is still controversial. Therefore, the purpose of this study was to systematically review cell-based approaches for periodontal regeneration in animal studies including a meta-analysis to obtain more clarity on their efficacy.

Influence of bone marrow-derived mesenchymal stem cells pre-implantation differentiation approach on periodontal regeneration in vivo.

Aim: The implantation of bone marrow-derived mesenchymal stem cells (MSCs) has previously been shown successful to achieve periodontal regeneration. However, the preferred pre-implantation differentiation strategy (e.g.

Periodontal tissue regeneration using enzymatically solidified chitosan hydrogels with or without cell loading.

This study is aimed to evaluate the in vivo biocompatibility and periodontal regenerative potential of enzymatically solidified chitosan hydrogels with or without incorporated periodontal ligament cells (PDLCs). To this end, chitosan hydrogels, with (n=8; CHIT+CELL) or without (n=8; CHIT) fluorescently labeled PDLCs, were prepared and transplanted into rat intrabony periodontal defects; untreated defects were used as empty controls (n=8; EMPTY). After 4 weeks, maxillae were harvested, decalcified, and used for histological, histomorphometrical, and immunohistochemical assessments.

Periodontal cell implantation contributes to the regeneration of the periodontium in an indirect way.

Periodontitis is the most common human infectious disease. Regeneration of bone and soft tissue defects after periodontitis remains challenging, although the transplantation of periodontal ligament (PDL) cells seems a liable strategy. However, little is known about the function of PDL cells after transplantation.

Human periodontal ligament derived progenitor cells: effect of STRO-1 cell sorting and Wnt3a treatment on cell behavior.

Objectives: STRO-1 positive periodontal ligament cells (PDLCs) and unsorted PDLCs have demonstrated potential for periodontal regeneration, but the comparison between unsorted cells and the expanded STRO-1 sorted cells has never been reported. Additionally, Wnt3a is involved in cell proliferation thus may benefit in vitro PDLC expansion. The aim was to evaluate the effect of STRO-1 cell sorting and Wnt3a treatment on cell behavior of human PDLCs (hPDLCs).

Enzymatic control of chitosan gelation for delivery of periodontal ligament cells.

The aim of this study is to optimize enzymatic control over gelation of chitosan-based hydrogels for the delivery of periodontal ligament cells (PDLCs). The results reveal that the gelation time, strength, and degradation rate of the chitosan hydrogels can be controlled precisely by variation of the urea and urease concentrations. PDLCs remain viable inside these hydrogels for up to 30 days.

Biomaterial strategies for stem cell maintenance during in vitro expansion.

Stem cells, having the potential for self-renewal and multilineage differentiation, are the building blocks for tissue/organ regeneration. Stem cells can be isolated from various sources but are, in general, available in too small numbers to be used directly for clinical purpose without intermediate expansion procedures in vitro. Although this in vitro expansion of undifferentiated stem cells is necessary, stem cells typically diminish their ability to self-renew and proliferate during passaging.

Effects of continuous passaging on mineralization of MC3T3-E1 cells with improved osteogenic culture protocol.

The murine-derived MC3T3-E1 cell line provided by the American Type Culture Collection (ATCC) is a well-known osteogenic cell culture model system to test materials in vitro. However, the effect of passaging on its mineralization capacity has never been described and their culture supplements can be further optimized. Therefore, we evaluated the influence of the passage number and different osteogenic culture supplements, including ascorbic acid (AsAP) and dexamethasone (Dex) on the osteogenic capacity of MC3T3-E1 cells.

[Construction and identification of a recombinant lentiviral expression plasmid pLentiTrident1-hBMP2-Neo-hNGF].

Purpose: To construct and confirm a recombinant lentiviral vector containing human bone morphogenetic protein 2 (hBMP2) and human nerve growth factor (hNGF).

Methods: The Neomycin gene was digested from pLentiTrident1-EGFP-Neo and then was subcloned into lentiviral vector. The hBMP2 and hNGF genes were amplified by polymerase chain reaction (PCR), and then the PCR product was inserted to proper sites of the vector.

A pilot study evaluating the effect of recombinant human bone morphogenetic protein-2 and recombinant human beta-nerve growth factor on the healing of Class III furcation defects in dogs.

Background: The quantity of regenerated bone induced by recombinant human bone morphogenetic protein-2 (rhBMP2) is encouraging, but sometimes the quality is inferior. Recombinant human beta-nerve growth factor (rh beta-NGF) plays a major role in bone remodeling. This study evaluates the quality and quantity of regenerated bone in periodontal regeneration following topical application of the two growth factors to Class III furcation defects.