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1.
ACS Appl Mater Interfaces ; 16(33): 43244-43256, 2024 Aug 21.
Artigo em Inglês | MEDLINE | ID: mdl-39136271

RESUMO

The development of efficient hemostatic materials is crucial for achieving rapid hemorrhage control and effective wound healing. Inorganic polyphosphate (polyP) is recognized as an effective modulator of the blood coagulation process. However, the specific effect of polyP chain length on coagulation is not yet fully understood. Furthermore, calcium ions (Ca2+) are essential for the coagulation process, promoting multiple enzyme-catalyzed reactions within the coagulation cascade. Hence, calcium ion-coupled polyphosphate powders with three different degrees of polymerization (CaPP-n, n = 20, 50, and 1500) are synthesized by an ion-exchange reaction. CaPP exhibits a crystalline phase at a low polymerization degree and transitions to an amorphous phase as the polymerization degree increases. Notably, the addition of Ca2+ enhances the wettability of polyP, and CaPP promotes hemostasis, with varying degrees of effectiveness related to chain length. CaPP-50 exhibits the most promising hemostatic performance, with the lowest blood clotting index (BCI, 12.1 ± 0.7%) and the shortest clotting time (302.0 ± 10.5 s). By combining Ca2+ with polyP of medium-chain length, CaPP-50 demonstrates an enhanced ability to accelerate the adhesion and activation of blood cells, initiate the intrinsic coagulation cascade, and form a stable blood clot, outperforming both CaPP-20 and CaPP-1500. The hemostatic efficacy of CaPP-50 is further validated using rat liver bleeding and femoral artery puncture models. CaPP-50 is proven to possess hemostatic properties comparable to those of commercial calcium-based zeolite hemostatic powder and superior to kaolin. In addition, CaPP-50 exhibits excellent biocompatibility and long-term storage stability. These results suggest that CaPP-50 has significant clinical and commercial potential as an active inorganic hemostatic agent for rapid control of bleeding.


Assuntos
Cálcio , Hemorragia , Polimerização , Polifosfatos , Animais , Polifosfatos/química , Polifosfatos/farmacologia , Cálcio/química , Ratos , Hemorragia/prevenção & controle , Hemorragia/tratamento farmacológico , Hemostáticos/química , Hemostáticos/farmacologia , Coagulação Sanguínea/efeitos dos fármacos , Ratos Sprague-Dawley , Masculino , Hemostasia/efeitos dos fármacos , Íons/química
2.
Sci Rep ; 14(1): 10656, 2024 May 09.
Artigo em Inglês | MEDLINE | ID: mdl-38724597

RESUMO

The integration of computer-aided design (CAD), computer-aided process planning (CAPP), and computer-aided manufacturing (CAM) systems is significantly enhanced by employing deep learning-based automatic feature recognition (AFR) methods. These methods outperform traditional, rule-based approaches, particularly in handling the complexities of intersecting features. However, existing deep learning-based AFR methods face two major challenges. The initial challenge stems from the frequent utilization of voxelized or point-cloud representations of CAD models, resulting in the unfortunate loss of valuable geometric and topological information inherent in original Boundary representation (B-Rep) models. The second challenge involves the limitation of supervised deep learning methods in identifying machining features that are not present in the predefined dataset. This constraint renders them suboptimal for the continually evolving datasets of real industrial scenarios. To address the first challenge, this study introduces a graph-structured language, Multidimensional Attributed Face-Edge Graph (maFEG), crafted to encapsulate the intricate geometric and topological details of CAD models. Furthermore, a graph neural network, Sheet-metalNet, is proposed for the efficient learning and interpretation of maFEGs. To tackle the second challenge, a three-component incremental learning strategy is proposed: an initial phase of pre-training and fine-tuning, a prototype sampling-based replay, and a stage employing knowledge distillation for parameter regularization. The effectiveness of Sheet-metalNet and its complementary incremental learning strategy is evaluated using the open-source MFCAD++ dataset and the newly created SMCAD dataset. Experimental results show that Sheet-metalNet surpasses state-of-the-art AFR methods in machining feature recognition accuracy. Moreover, Sheet-metalNet demonstrates adaptability to dynamic dataset changes, maintaining high performance when encountering newly introduced features, thanks to its innovative incremental learning strategy.

3.
J Mol Biol ; 435(24): 168338, 2023 12 15.
Artigo em Inglês | MEDLINE | ID: mdl-37923120

RESUMO

To facilitate the eukaryotic repriming pathway of DNA damage tolerance, PrimPol synthesises de novo oligonucleotide primers downstream of polymerase-stalling obstacles. These primers enable replicative polymerases to resume synthesis and ensure the timely completion of DNA replication. Initiating synthesis de novo requires the coordination of single-stranded DNA, initiating nucleotides, and metal ions within PrimPol's active site to catalyze the formation of the first phosphodiester bond. Here we examine the interactions between human PrimPol's catalytic domain, nucleotides, and DNA template during each of the various catalytic steps to determine the 'choreography' of primer synthesis, where substrates bind in an ordered manner. Our findings show that the ability of PrimPol to conduct de novo primer synthesis is underpinned by a network of stabilising interactions between the enzyme, template, and nucleotides, as we previously observed for related primase CRISPR-Associated Prim-Pol (CAPP). Together, these findings establish a detailed model for the initiation of DNA synthesis by human PrimPol, which appears highly conserved.


Assuntos
Domínio Catalítico , Replicação do DNA , DNA Polimerase Dirigida por DNA , Humanos , DNA Primase/metabolismo , DNA de Cadeia Simples/genética , DNA Polimerase Dirigida por DNA/metabolismo , Enzimas Multifuncionais/genética , Enzimas Multifuncionais/metabolismo , Nucleotídeos
5.
Cancer Med ; 12(17): 17632-17637, 2023 09.
Artigo em Inglês | MEDLINE | ID: mdl-37587851

RESUMO

INTRODUCTION: We investigated a commercially available sequencing panel to study the effect of sequencing depth, variant calling strategy, and targeted sequencing region on identifying tumor-derived variants in cell-free bronchoalveolar lavage (cfBAL) DNA compared with plasma cfDNA. METHODS: Sequencing was performed at low or high coverage using two filtering algorithms to identify tumor variants on two panels targeting 77 and 197 genes respectively. RESULTS: One hundred and four sequencing files from 40 matched DNA samples of cfBAL, plasma, germline leukocytes, and archival tumor specimens in 10 patients with early-stage lung cancer were analyzed. By low-coverage sequencing, tumor-derived cfBAL variants were detected in 5/10 patients (50%) compared with 2/10 (20%) for plasma. High-coverage sequencing did not affect the number of tumor-derived variants detected in either biospecimen type. Accounting for germline mutations eliminated false-positive plasma calls regardless of coverage (0/10 patients with tumor-derived variants identified) and increased the number of cfBAL calls (5/10 patients with tumor-derived variants identified). These results were not affected by the number of targeted genes.


Assuntos
Ácidos Nucleicos Livres , Neoplasias Pulmonares , Humanos , Líquido da Lavagem Broncoalveolar , Neoplasias Pulmonares/patologia , Pulmão/patologia , DNA , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Genômica/métodos , Mutação
6.
Biosci Rep ; 43(7)2023 07 26.
Artigo em Inglês | MEDLINE | ID: mdl-37358261

RESUMO

To pass on genetic information to the next generation, cells must faithfully replicate their genomes to provide copies for each daughter cell. To synthesise these duplicates, cells employ specialised enzymes called DNA polymerases, which rapidly and accurately replicate nucleic acid polymers. However, most polymerases lack the ability to directly initiate DNA synthesis and required specialised replicases called primases to make short polynucleotide primers, from which they then extend. Replicative primases (eukaryotes and archaea) belong to a functionally diverse enzyme superfamily known as Primase-Polymerases (Prim-Pols), with orthologues present throughout all domains of life. Characterised by a conserved catalytic Prim-Pol domain, these enzymes have evolved various roles in DNA metabolism, including DNA replication, repair, and damage tolerance. Many of these biological roles are fundamentally underpinned by the ability of Prim-Pols to generate primers de novo. This review examines our current understanding of the catalytic mechanisms utilised by Prim-Pols to initiate primer synthesis.


Assuntos
DNA Primase , DNA Polimerase Dirigida por DNA , DNA Primase/genética , DNA Primase/metabolismo , DNA Polimerase Dirigida por DNA/genética , Replicação do DNA , Domínio Catalítico , DNA
7.
J Forensic Sci ; 68(4): 1245-1258, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37194196

RESUMO

The Comprehensive Assessment of Psychopathic Personality (CAPP) model is a new lexically based concept of psychopathy that has potential clinical utility. The main purpose of this research is to investigate the generalizability of the CAPP conceptual model in South Korea. In the current study, 88 experts and 1727 laypeople in South Korea were asked to evaluate the prototypicality of the symptoms of psychopathy (CAPP items) by using a Korean translation of the CAPP model (K-CAPP). In addition, 11 international prototypicality studies were systematically compared to the ratings by experts in the present study. As a result, it indicated that Korean experts and laypeople, on average, rated K-CAPP symptoms as moderately to highly prototypical of psychopathy, and more prototypical of psychopathy than symptoms theoretically unrelated to psychopathy (foils). Also, prototypicality ratings of K-CAPP symptoms made by those two groups were similar to each other as well as to ratings by experts and laypeople using the CAPP in other 11 countries. In conclusion, these results clearly show that both experts and laypeople in the current study conceptualized PPD in almost the same way as experts and laypeople from previous studies using the CAPP model.


Assuntos
Transtorno da Personalidade Antissocial , Comparação Transcultural , Humanos , Transtorno da Personalidade Antissocial/diagnóstico , Transtorno da Personalidade Antissocial/etnologia , Povo Asiático , Determinação da Personalidade , Psicometria/métodos , República da Coreia , População do Leste Asiático/psicologia
8.
Clin Chem ; 68(12): 1509-1518, 2022 12 06.
Artigo em Inglês | MEDLINE | ID: mdl-36177751

RESUMO

BACKGROUND: Circulating tumor DNA (ctDNA) is a promising biomarker for early tumor detection and minimal residual disease (MRD) assessment in early-stage cancer, but quantifying minute amounts of ctDNA is challenging and well-designed studies on ctDNA in early-stage cancer are still lacking. Here, we adapted a sensitive next-generation sequencing (NGS) technology and performed parallel analysis of pre- and postoperative ctDNA and matched tumor tissues in a prospective cohort of patients with resectable pancreatic ductal adenocarcinoma (PDAC). METHODS: In total, 70 consecutive patients undergoing curative resection for resectable PDAC were enrolled. We performed integrated digital error suppression-enhanced cancer personalized profiling by deep sequencing NGS of triple-matched samples (pre/postoperative plasma cell-free DNA [cfDNA], tumor tissue, and genomic DNA) targeting 77 genes. RESULTS: Preoperative ctDNA was detected in 37.7% of the evaluable patients, with a median variant allele frequency of 0.09%. Twelve additional oncogenic mutations were detected exclusively in preoperative ctDNA but not in tissue. When quantitative concentrations of ctDNA were estimated in haploid genome equivalents per milliliter (hGE/mL), the risk of early recurrence was high in patients with postoperative ctDNA >1 hGE/mL. cfDNA variants from 24.5% of patients had features compatible with clonal hematopoiesis. CONCLUSIONS: An optimized NGS approach might add value beyond tissue analysis through the highly sensitive detection of minute amounts of ctDNA in resectable PDAC. Postoperative ctDNA concentration could be a tool for MRD assessment. Moreover, parallel analyses of matched tissues and leukocytes might be required to accurately detect clinically relevant ctDNA.


Assuntos
Adenocarcinoma , DNA Tumoral Circulante , Neoplasias Pancreáticas , Humanos , DNA Tumoral Circulante/genética , Estudos Prospectivos , Biomarcadores Tumorais , Mutação , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/cirurgia , Neoplasias Pancreáticas/patologia , Sequenciamento de Nucleotídeos em Larga Escala , Neoplasia Residual , Neoplasias Pancreáticas
9.
Br J Haematol ; 198(6): 1016-1022, 2022 09.
Artigo em Inglês | MEDLINE | ID: mdl-35829664

RESUMO

Richter syndrome (RS) is mostly due to the direct transformation of the chronic lymphocytic leukaemia (CLL) clone, as documented by the same immunoglobulin heavy-chain variable region (IGHV) rearrangement in both CLL and RS cells. In rare cases characterized by a better outcome, the RS clone harbours a different IGHV rearrangement compared to the CLL phase. We investigated the CLL phase of clonally unrelated RS to test whether the RS clone was already identifiable prior to clinicopathologic transformation, albeit undetectable by conventional approaches. CLL cells of eight patients with unrelated RS were subjected to an ultra-deep next-generation sequencing (NGS) approach with a sensitivity of 10-6 . In 7/8 cases, the RS rearrangement was not identified in the CLL phase. In one case, the RS clone was identified at a very low frequency in the CLL phase, conceivably due to the concomitance of CLL sampling and RS diagnosis. Targeted resequencing revealed that clonally unrelated RS carries genetic lesions primarily affecting the TP53, MYC, ATM and NOTCH1 genes. Conversely, mutations frequently involved in de novo diffuse large B-cell lymphoma (DLBCL) without a history of CLL were absent. These results suggest that clonally unrelated RS is a truly de novo lymphoma with a mutational profile reminiscent, at least in part, of clonally related RS.


Assuntos
Leucemia Linfocítica Crônica de Células B , Linfoma Difuso de Grandes Células B , Aberrações Cromossômicas , Humanos , Região Variável de Imunoglobulina/genética , Leucemia Linfocítica Crônica de Células B/patologia , Linfoma Difuso de Grandes Células B/genética , Linfoma Difuso de Grandes Células B/patologia , Mutação
10.
Micromachines (Basel) ; 13(4)2022 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-35457924

RESUMO

Simulation technology is widely used in computer-aided process planning (CAPP). The part machining process is simulated in the virtual world, which can predict manufacturing errors and optimize the process plan. Simulation accuracy is the guarantee of process decision-making and optimization. This article focuses on the use of digital twin technology to build a high-fidelity process model, taking the advantage of the integration of multiple systems, in order to achieve the dynamic association of real-time manufacturing data and process models. Making use of the CAPP/MES systems, the surface inspection data of the part is fed back to the CAPP system and associated with the digital twin process model. The wavelet transform method is used to reduce the noise of the high-frequency signal of the detection data, and the signal-to-noise ratio (SNR) is calculated to verify the noise reduction effect. The surface topography, after noise reduction, was reconstructed in Matlab. On this basis, the Poisson reconstruction algorithm is used to reconstruct the high-fidelity process model for the refined simulation of the subsequent processes. Finally, by comparing the two sets of simulation experiments with the real machining results, we found that the simulation results, based on the digital twin model, are more accurate than the traditional simulation method by 58%.

11.
Contemp Clin Trials Commun ; 24: 100864, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34926863

RESUMO

Asthma is the most common chronic condition among children, with low-income families living in urban areas experiencing significantly higher rates. Evidence based interventions for asthma are routinely implemented in either the home, school, or primary care setting. However, even when caregivers of poor children are engaged in asthma interventions in one setting, they often have to navigate challenges in another setting, such as an under-resourced home, non-supportive school, or disengaged health care provider. The West Philadelphia Asthma Care Implementation Plan aims to compare the effectiveness of a primary care-based intervention, school-based intervention, and combined primary care and school intervention to usual care for improving asthma control in school-age children to explore if the synergistic effect of Community Health Worker (CHW) support in the home, school, and health care environments will result in improved asthma control. Children ages 5-13 with uncontrolled asthma from four West Philadelphia recruitment sites will be eligible for enrollment. The families of school age children interested in participating will be randomized to receive a primary care CHW or usual care. Those identified as attending a participating school will have a CHW-led school intervention or usual care in school. If proven effective, this care coordination program will assist caregivers in assessing resources, improving self-management skills, and ultimately reducing asthma-related ED visits and hospitalizations as well as provide additional information for healthcare systems and policy makers to inform their decisions about how and where to focus additional resources and investments in childhood asthma care to improve health outcomes.

12.
Infection ; 49(6): 1233-1240, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34499324

RESUMO

PURPOSE: Anthropophilic dermatophytes as etiological factors of onychomycoses are more common than zoophilic fungi. In the case of the latter, reverse zoonoses are possible, which poses a threat to the persistence of dermatophytes in the environment. Nevertheless, without treatment, both types of tinea unguium may lead to complete nail plate destruction and secondary mixed infections with fungi and bacteria. One of the zoophilic dermatophytes that cause onychomycosis is Trichophyton verrucosum, whose prevalence has been increasing in recent years. Such infections are usually treated with allylamines and/or azoles, but such a conventional treatment of infections caused by T. verrucosum often fails or is discontinued by patients. METHODS: Herein, we reveal the results of our in vitro studies related to direct application of cold atmospheric pressure plasma (CAPP) on Trichophyton verrucosum growth, germination and adherence to nail as a new alternative treatment method of such types of dermatomycoses. RESULTS: Our in vitro studies showed that, while exposure to CAPP for 10 min delays germination of conidia and clearly impairs the fitness of the fungal structures, 15 min is enough to kill all fungal elements exposed to plasma. Moreover, the SEM images revealed that T. verrucosum cultures exposed to CAPP for 10 and 15 min were not able to invade the nail fragments. CONCLUSION: The results revealed that single exposure to CAPP was able to inhibit T. verrucosum growth and infection capacity. Hence, cold atmospheric pressure plasma should be considered as a promising alternative treatment of onychomycoses.


Assuntos
Dermatomicoses , Onicomicose , Gases em Plasma , Animais , Arthrodermataceae , Pressão Atmosférica , Humanos , Onicomicose/tratamento farmacológico , Gases em Plasma/uso terapêutico , Zoonoses
13.
Int J Mol Sci ; 22(16)2021 Aug 07.
Artigo em Inglês | MEDLINE | ID: mdl-34445215

RESUMO

Zea mays L. is one of the most produced crops, and there are still parts of the world where maize is the basic staple food. To improve agriculture, mankind always looks for new, better methods of growing crops, especially in the current changing climatic conditions. Cold atmospheric pressure plasma (CAPP) has already showed its potential to enhance the culturing of crops, but it still needs more research for safe implementation into agriculture. In this work, it was shown that short CAPP treatment of maize grains had a positive effect on the vitality of grains and young seedlings, which may be connected to stimulation of antioxidant and lytic enzyme activities by short CAPP treatment. However, the prolonged treatment had a negative impact on the germination, growth, and production indexes. CAPP treatment caused the increased expression of genes for heat shock proteins HSP101 and HSP70 in the first two days after sowing. Using comet assay it was observed that shorter treatment times (30-120 s) did not cause DNA damage. Surface diagnostics of plasma-treated grains showed that plasma increases the hydrophilicity of the surface but does not damage the chemical bonds on the surface.


Assuntos
Grão Comestível/crescimento & desenvolvimento , Proteínas de Choque Térmico HSP70/metabolismo , Peptídeo Hidrolases/metabolismo , Proteínas de Plantas/metabolismo , Gases em Plasma/farmacologia , Fatores de Transcrição/metabolismo , Zea mays/crescimento & desenvolvimento , Pressão Atmosférica
14.
J Pers Disord ; 35(Supple C): 75-96, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34287068

RESUMO

The Comprehensive Assessment of Psychopathic Personality (CAPP) is a lexically based conceptual model of psychopathy. Despite widespread use in research settings, the Lexical Rating Scale for the CAPP (CAPP-LRS) requires an advanced reading level for completion. The present study is the first to evaluate the content validity of the CAPP-Basic, a lexically simplified version of the CAPP-LRS designed for use with individuals possessing lower verbal skills. Symptoms were rated by mental health professionals (N = 121). Findings were largely in line with results of previous studies, indicating good content validity of the CAPP-Basic at the domain and symptom level.


Assuntos
Transtorno da Personalidade Antissocial , Determinação da Personalidade , Transtorno da Personalidade Antissocial/diagnóstico , Humanos , Modelos Psicológicos , Psicometria
15.
Plants (Basel) ; 10(1)2021 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-33477930

RESUMO

The present study aims to define the effects of Cold Atmospheric Pressure Plasma (CAPP) exposure on seed germination of an agriculturally important crop, soybean. Seed treatment with lower doses of CAPP generated in ambient air and oxygen significantly increased the activity of succinate dehydrogenase (Krebs cycle enzyme), proving the switching of the germinating seed metabolism from anoxygenic to oxygenic. In these treatments, a positive effect on seed germination was documented (the percentage of germination increased by almost 20% compared to the untreated control), while the seed and seedling vigour was also positively affected. On the other hand, higher exposure times of CAPP generated in a nitrogen atmosphere significantly inhibited succinate dehydrogenase activity, but stimulated lactate and alcohol dehydrogenase activities, suggesting anoxygenic metabolism. It was also found that plasma exposure caused a slight increment in the level of primary DNA damage in ambient air- and oxygen-CAPP treatments, and more significant DNA damage was found in nitrogen-CAPP treatments. Although a higher level of DNA damage was also detected in the negative control (untreated seeds), this might be associated with the age of seeds followed by their lower germination capacity (with the germination percentage reaching only about 60%).

16.
BMC Musculoskelet Disord ; 21(1): 34, 2020 Jan 16.
Artigo em Inglês | MEDLINE | ID: mdl-31948409

RESUMO

BACKGROUND: Intertrochanteric femoral fractures are prevalent among the elderly, and usually demands surgical treatments. Proximal femoral nail antirotation Asian version (PFNA-II) is widely used for intertrochanteric fracture treatment. The computer-assisted preoperative planning (CAPP) system has the potential to reduce the difficulty of PFNA-II in the treatment of intertrochanteric fractures. The aim of the study was to investigate and compare the learning curves of PFNA-II treatment with CAPP and conventional preoperational planning methods for intertrochanteric femoral fractures. METHODS: A total of 125 patients with intertrochanteric fracture who were treated with PFNA-II between March 2012 and June 2015 were retrospectively analyzed. Patients who underwent surgery with CAPP procedure by a junior surgeon were regarded as group A (n = 53); patients who underwent the conventional surgery by another junior surgeon were regarded as group B (n = 72). Each group was divided into three subgroups (case 1-20, case 21-40, case 41-53 or case 41-72). RESULTS: The average operation time of group A was 45.00(42.00, 50.00) minutes, and in group B was 55.00 (50.00, 60.00) minutes (P < 0.01). Average radiation frequency and blood loss were 13.02 ± 2.32, 160.00 (140.00, 170.00) ml and 20.92 ± 3.27, 250.00 (195.00, 279.50) ml, respectively, with significant differences (P < 0.01). The learning curve of the surgical procedure in group A was steeper than that in group B. There were no significant differences in patient reported outcomes, hospital stay and complication rate between the two groups. Significant differences were observed between group A and B in Harris score at last follow-up in the AO/OTA type 31-A2 intertrochanteric fracture (P < 0.05). CONCLUSION: Compared with conventional preoperative planning methods, CAPP system significantly reduced operation time, radiation frequency and blood loss, thus reshaped the learning curve of PFNA-II treatment with lower learning difficulty. TRIAL REGISTRATION: researchregistry4770. Registered 25 March 2019.


Assuntos
Tomada de Decisões Assistida por Computador , Fixação Interna de Fraturas/métodos , Fraturas do Quadril/cirurgia , Curva de Aprendizado , Idoso , Pinos Ortopédicos , Feminino , Fixação Interna de Fraturas/educação , Fixação Interna de Fraturas/instrumentação , Humanos , Tempo de Internação/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Duração da Cirurgia , Estudos Retrospectivos , Resultado do Tratamento
17.
Br J Oral Maxillofac Surg ; 58(3): 329-333, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-31969253

RESUMO

The use of cold atmospheric pressure plasma (CAPP) as a bacterial decontaminant for chronic wounds has shown good results. The purpose of this in vitro study was to evaluate the bactericidal effects of CAPP on the cancellous area of the bone. Sterile glass slides and processed sterile human bone allografts 1, 2, 3, and 4mm thick were used for initial contamination and further CAPP treatment. Each block was contaminated with Staphylococcus aureus suspension on one side. Each slide was turned 180° and treated on the reverse side. The bacterial count in colony-forming units (CFU) was then measured and compared with that of a control group, and the bactericidal effects of CAPP in relation to bone density evaluated. A significant reduction in count was measured between treated and untreated groups (groups A-D: p<0.01 and group E: p=0.04). A strong positive linear relation was found between bone density and the S aureus count (r=0.844, p=0.156). Treatment with CAPP had a bactericidal effect on bone structures with a penetration depth of up to 4mm. It might be used for all diseases involving infected bone, and so extends the existing range of treatments.


Assuntos
Gases em Plasma , Infecções Estafilocócicas , Antibacterianos , Pressão Atmosférica , Humanos , Staphylococcus aureus
18.
J Abnorm Child Psychol ; 47(9): 1467-1482, 2019 09.
Artigo em Inglês | MEDLINE | ID: mdl-30887147

RESUMO

A central aim of research on psychopathic personality disturbance (PPD) involves identifying core features of the construct. This has been addressed primarily through prototypicality studies and research using item-response theory. More recently, the logic of social network analysis was extended to psychopathology research to examine which symptoms were most central to PPD networks. Such studies identified affective symptoms of the disorder as especially central among adult offenders. To build upon this prior research, the current study used data on male offenders from the Incarcerated Serious and Violent Young Offender Study to examine the network structure of the Comprehensive Assessment of Psychopathic Personality - Institutional Rating Scale (CAPP-IRS; n = 224) and Psychopathy Checklist: Youth Version (PCL:YV; n = 445). Using multiple measures of PPD helped avoid equating measures with constructs. In both the CAPP-IRS and PCL:YV networks, in line with prior studies, attachment/affective features of the disorder were most central. Several recommendations are made for future research, including the need to study the longitudinal development of PPD using a network approach.


Assuntos
Transtorno da Personalidade Antissocial/fisiopatologia , Transtorno da Conduta/fisiopatologia , Criminosos , Delinquência Juvenil , Adolescente , Estudos de Coortes , Humanos , Masculino
19.
Artigo em Inglês | MEDLINE | ID: mdl-30577656

RESUMO

Pediculosis, that is the infestation of humans with Pediculus humanus capitis (head lice), poses a worldwide problem that is as old as mankind itself. Over the centuries, man has developed a variety of remedies, all of which have ultimately culminated in the use of chemical agents. Some of these remedies are known to produce successful results. A large portion of the effective remedies used to kill lice and their eggs contain insecticides, but there is an increasing number of reports of head lice populations revealing an increased resistance. This study presents an alternative treatment approach, the efficacy of which is based on physical effects. Cold atmospheric pressure plasmas have successfully shown their formidably wide application range within the field of plasma medicine. This study presents a plasma device in its current stage of development that is engineered as a consumer product to enable an alternative physical and insecticide-free option for the treatment of pediculosis. An efficacy study concerning different developmental stages of P. humanus humanus is presented. P. humanus humanus was chosen as a substitute test organism for P. humanus capitis due to possible laboratory rearing and high anatomic similarity. The study shows how a single stroke of the plasma device over a hair strand (approximately 22 cm in length with a weight of 1.5 g) led to mortality rates of 68.3% (50.0; 79.7) (95% CI) in the juvenile test group, a mortality rate of approx. 67.7% (54.9; 78.8) (95% CI) in the female test group, and approx. 46.7% (28.3; 65.7) (95% CI) in the male test group. When single eggs were introduced directly into the plasma for approx. 1 s, younger eggs (0⁻2 d) showed a higher mortality of 66.7% (42.7; 82.7) than the older (4⁻6 d) eggs, with 16.7% (5.6; 34.7) (CI). Furthermore, the results of a risk assessment of the device are described. The article concludes with necessary handling instructions as well as further developmental steps, derived from the results of the efficacy and the risk assessment study.


Assuntos
Dermatologia/instrumentação , Infestações por Piolhos/terapia , Pediculus/fisiologia , Gases em Plasma/uso terapêutico , Animais , Feminino , Humanos , Masculino , Gases em Plasma/normas , Análise de Sobrevida
20.
J Craniomaxillofac Surg ; 46(12): 2197-2202, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30316654

RESUMO

PURPOSE: Cold atmospheric pressure plasma (CAPP) is increasingly used for medical applications. The first devices are available from commercial manufactures, promising to improve wound healing and disinfection. The underlying antimicrobial mechanisms of CAPP are discussed, while the first results on its bactericidal efficiency against common bacterial species have already been published, with promising results. Most of the plasma sources used in these studies were built by the investigators themselves, and are not commercially available or licensed for clinical use. To evaluate the postulated bactericidal effects in clinical practice, we studied a commercially available, ready-to-use CAPP-device, which is also designed to be used in the field of dental, oral, and maxillofacial treatment. MATERIALS AND METHODS: Standardized bacterial cultures of two different pathogens (Acinetobacter baumannii and Staphylococcus aureus) were produced with defined colony-forming unit concentrations. Dilutions of these cultures were treated with a commercially available CAPP product according to the manufacturer's instructions in order to evaluate the antimicrobial activity of the technique. This in vitro study compared the CAPP treatment with established clinical therapies like polihexanide (PHX) and antimicrobial photodynamic therapy (aPDT). RESULTS: The bactericidal effect was evaluated in terms of reduction in colony-forming units after treatment of the bacterial samples with a defined dose of plasma, aPDT, or PHX. For CAPP, the bactericidal effect was found to be stronger in the Gram-negative isolate (A. baumannii) than in the Gram-positive S. aureus. A strong depth dependency was observed, especially with the Gram-negative isolate. Good bactericidal effects, with a reduction in bacterial load of more than 2 × log10, could only be observed in conditions of 0.3 mm of water-film thickness or less. Such a significant reduction in bactericidal effect depending on depth was not observed using aPDT or PHX in the studied depth range of 0.3-1.8 mm. CONCLUSION: CAPP treatment performed by the device (Plasma ONE) and configuration we used in this study seems to be ill suited for sufficiently killing Acinetobacter baumannii or Staphylococcus aureus in a moist infection site, as would be expected in the oral cavity. Established local antimicrobial therapies using PHX or aPDT showed better disinfectant properties. The clinical effect of improved wound healing, described by the manufacturer and some scientists, could not be investigated using this model. Given the results, however, it seems unlikely to be a direct consequence of bactericidal effects of CAPP in a wet environment. Further development of CAPP devices, or a different configuration (e.g. with a higher output, resulting in reactive nitrogen species-dominated, gas-phase chemistry), may enhance antibacterial effects in future, while tissue compatibility of such techniques remains to be elucidated further.


Assuntos
Antibacterianos/farmacologia , Biguanidas/farmacologia , Desinfetantes/farmacologia , Viabilidade Microbiana/efeitos dos fármacos , Fotoquimioterapia/métodos , Gases em Plasma/farmacologia , Acinetobacter baumannii , Pressão Atmosférica , Biofilmes/efeitos dos fármacos , Técnicas In Vitro , Staphylococcus aureus , Células-Tronco , Propriedades de Superfície
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