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1.
Cell ; 173(5): 1111-1122.e10, 2018 05 17.
Artigo em Inglês | MEDLINE | ID: mdl-29606355

RESUMO

The development of interventions to prevent congenital Zika syndrome (CZS) has been limited by the lack of an established nonhuman primate model. Here we show that infection of female rhesus monkeys early in pregnancy with Zika virus (ZIKV) recapitulates many features of CZS in humans. We infected 9 pregnant monkeys with ZIKV, 6 early in pregnancy (weeks 6-7 of gestation) and 3 later in pregnancy (weeks 12-14 of gestation), and compared findings with uninfected controls. 100% (6 of 6) of monkeys infected early in pregnancy exhibited prolonged maternal viremia and fetal neuropathology, including fetal loss, smaller brain size, and histopathologic brain lesions, including microcalcifications, hemorrhage, necrosis, vasculitis, gliosis, and apoptosis of neuroprogenitor cells. High-resolution MRI demonstrated concordant lesions indicative of deep gray matter injury. We also observed spinal, ocular, and neuromuscular pathology. Our data show that vascular compromise and neuroprogenitor cell dysfunction are hallmarks of CZS pathogenesis, suggesting novel strategies to prevent and to treat this disease.


Assuntos
Feto/virologia , Neurônios/patologia , Infecção por Zika virus/patologia , Zika virus/patogenicidade , Animais , Animais Recém-Nascidos , Apoptose , Encéfalo/diagnóstico por imagem , Encéfalo/patologia , Calcinose/patologia , Calcinose/veterinária , Feminino , Idade Gestacional , Macaca mulatta , Imageamento por Ressonância Magnética , Necrose , Células-Tronco Neurais/citologia , Células-Tronco Neurais/metabolismo , Células-Tronco Neurais/virologia , Neurônios/virologia , Gravidez , Índice de Gravidade de Doença , Vasculite/patologia , Vasculite/veterinária , Infecção por Zika virus/veterinária , Infecção por Zika virus/virologia
2.
Artigo em Inglês | MEDLINE | ID: mdl-35275805

RESUMO

Two sulphur-oxidizing, chemolithoautotrophic aerobes were isolated from the chemocline of an anchialine sinkhole located within the Weeki Wachee River of Florida. Gram-stain-negative cells of both strains were motile, chemotactic rods. Phylogenetic analysis of the 16S rRNA gene and predicted amino acid sequences of ribosomal proteins, average nucleotide identities, and alignment fractions suggest the strains HH1T and HH3T represent novel species belonging to the genus Thiomicrorhabdus. The genome G+C fraction of HH1T is 47.8 mol% with a genome length of 2.61 Mb, whereas HH3T has a G+C fraction of 52.4 mol% and 2.49 Mb genome length. Major fatty acids of the two strains included C16 : 1, C18 : 1 and C16 : 0, with the addition of C10:0 3-OH in HH1T and C12 : 0 in HH3T. Chemolithoautotrophic growth of both strains was supported by elemental sulphur, sulphide, tetrathionate, and thiosulphate, and HH1T was also able to use molecular hydrogen. Neither strain was capable of heterotrophic growth or use of nitrate as a terminal electron acceptor. Strain HH1T grew from pH 6.5 to 8.5, with an optimum of pH 7.4, whereas strain HH3T grew from pH 6 to 8 with an optimum of pH 7.5. Growth was observed between 15-35 °C with optima of 32.8 °C for HH1T and 32 °C for HH3T. HH1T grew in media with [NaCl] 80-689 mM, with an optimum of 400 mM, while HH3T grew at 80-517 mM, with an optimum of 80 mM. The name Thiomicrorhabdus heinhorstiae sp. nov. is proposed, and the type strain is HH1T (=DSM 111584T=ATCC TSD-240T). The name Thiomicrorhabdus cannonii sp. nov is proposed, and the type strain is HH3T (=DSM 111593T=ATCC TSD-241T).


Assuntos
DNA Bacteriano , Técnicas de Tipagem Bacteriana , Composição de Bases , DNA Bacteriano/genética , Ácidos Graxos/química , Florida , Hospitais , Oxirredução , Filogenia , RNA Ribossômico 16S/genética , Análise de Sequência de DNA , Enxofre/metabolismo
3.
J Bacteriol ; 203(23): e0037721, 2021 11 05.
Artigo em Inglês | MEDLINE | ID: mdl-34543103

RESUMO

In nature, concentrations of dissolved inorganic carbon (DIC; CO2 + HCO3- + CO32-) can be low, and autotrophic organisms adapt with a variety of mechanisms to elevate intracellular DIC concentrations to enhance CO2 fixation. Such mechanisms have been well studied in Cyanobacteria, but much remains to be learned about their activity in other phyla. Novel multisubunit membrane-spanning complexes capable of elevating intracellular DIC were recently described in three species of bacteria. Homologs of these complexes are distributed among 17 phyla in Bacteria and Archaea and are predicted to consist of one, two, or three subunits. To determine whether DIC accumulation is a shared feature of these diverse complexes, seven of them, representative of organisms from four phyla, from a variety of habitats, and with three different subunit configurations, were chosen for study. A high-CO2-requiring, carbonic anhydrase-deficient (ΔyadF ΔcynT) strain of Escherichia coli Lemo21(DE3), which could be rescued via elevated intracellular DIC concentrations, was created for heterologous expression and characterization of the complexes. Expression of all seven complexes rescued the ability of E. coli Lemo21(DE3) ΔyadF ΔcynT to grow under low-CO2 conditions, and six of the seven generated measurably elevated intracellular DIC concentrations when their expression was induced. For complexes consisting of two or three subunits, all subunits were necessary for DIC accumulation. Isotopic disequilibrium experiments clarified that CO2 was the substrate for these complexes. In addition, the presence of an ionophore prevented the accumulation of intracellular DIC, suggesting that these complexes may couple proton potential to DIC accumulation. IMPORTANCE To facilitate the synthesis of biomass from CO2, autotrophic organisms use a variety of mechanisms to increase intracellular DIC concentrations. A novel type of multisubunit complex has recently been described, which has been shown to generate measurably elevated intracellular DIC concentrations in three species of bacteria, raising the question of whether these complexes share this capability across the 17 phyla of Bacteria and Archaea where they are found. This study shows that DIC accumulation is a trait shared by complexes with various subunit structures, from organisms with diverse physiologies and taxonomies, suggesting that this trait is universal among them. Successful expression in E. coli suggests the possibility of their expression in engineered organisms synthesizing compounds of industrial importance from CO2.


Assuntos
Processos Autotróficos/fisiologia , Bactérias/classificação , Bactérias/metabolismo , Carbono/metabolismo , Bactérias/genética , Proteínas de Bactérias , Dióxido de Carbono/metabolismo , Cromatografia Líquida , Regulação Bacteriana da Expressão Gênica , Genoma Bacteriano , Concentração de Íons de Hidrogênio , Espectrometria de Massas em Tandem
4.
J Virol ; 92(6)2018 03 15.
Artigo em Inglês | MEDLINE | ID: mdl-29298888

RESUMO

Human and chimpanzee adenovirus vectors are being developed to circumvent preexisting antibodies against common adenovirus vectors such as Ad5. However, baseline immunity to these vectors still exists in human populations. Traditional cloning of new adenovirus vaccine vectors is a long and cumbersome process that takes 2 months or more and that requires rare unique restriction enzyme sites. Here we describe a novel, restriction enzyme-independent method for rapid cloning of new adenovirus vaccine vectors that reduces the total cloning procedure to 1 week. We developed 14 novel adenovirus vectors from rhesus monkeys that can be grown to high titers and that are immunogenic in mice. All vectors grouped with the unusual adenovirus species G and show extremely low seroprevalence in humans. Rapid cloning of novel adenovirus vectors is a promising approach for the development of new vector platforms. Rhesus adenovirus vectors may prove useful for clinical development.IMPORTANCE To overcome baseline immunity to human and chimpanzee adenovirus vectors, we developed 14 novel adenovirus vectors from rhesus monkeys. These vectors are immunogenic in mice and show extremely low seroprevalence in humans. Rhesus adenovirus vectors may prove useful for clinical development.


Assuntos
Adenoviridae , Vacinas contra Adenovirus , Clonagem Molecular , Vetores Genéticos , Imunogenicidade da Vacina/genética , Células A549 , Adenoviridae/genética , Adenoviridae/imunologia , Vacinas contra Adenovirus/genética , Vacinas contra Adenovirus/imunologia , Animais , Vetores Genéticos/genética , Vetores Genéticos/imunologia , Humanos , Macaca mulatta , Camundongos
5.
Breast Cancer Res Treat ; 168(3): 625-630, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29275435

RESUMO

PURPOSE: Defects in the homologous recombination (HR) DNA repair pathway sensitize tumors to therapeutics that target this pathway. A significant proportion of triple-negative breast cancers (TNBC) carry HR defects. The HRD assay is highly associated with sensitivity to neoadjuvant platinum-based chemotherapy in TNBC. Standard chemotherapy consists of some combination of an anthracycline, cyclophosphamide, and taxane. This study assesses the association of HR deficiency status with response to standard neoadjuvant chemotherapy in TNBC or BRCA1/2 mutation-associated breast cancer. METHODS: Tumor samples were retrospectively obtained from 45 TNBC patients and 2 BRCA1/2 mutant, hormone receptor-positive/HER2-negative breast cancer patients who received anthracycline- and/or taxane-based neoadjuvant chemotherapy at Stanford University or Cedars-Sinai Medical Centers. The HRD score and tumor BRCA1/2 mutation status were determined from baseline tumor biopsies. HR deficient tumors were those with a HRD score of ≥ 42 or a tumor BRCA1/2 mutation. Response was categorized by the residual cancer burden (RCB) index. RESULTS: HR deficient patients were more likely to achieve a pathologic complete response (pCR) compared with non-deficient patients (OR 13.06, CI 1.52-11.241, p = 0.0028). Among BRCA1/2 mutation wild-type patients, HR deficient patients were more likely to achieve a pCR (OR 16, 95% CI 1.65-160.41, p = 0.0041) compared with HR non-deficient patients. Further, HRD scores were highly concordant pre- and post-therapy (Spearman correlation > 99%). CONCLUSIONS: HR deficiency status is significantly associated with response to standard neoadjuvant chemotherapy in TNBC. This observation is consistent with the mechanisms of action of doxorubicin and cyclophosphamide as DNA damaging agents.


Assuntos
Proteína BRCA1/genética , Proteína BRCA2/genética , Recombinação Homóloga/genética , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Adulto , Idoso , Antraciclinas/administração & dosagem , Antraciclinas/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Hidrocarbonetos Aromáticos com Pontes/administração & dosagem , Hidrocarbonetos Aromáticos com Pontes/efeitos adversos , Feminino , Humanos , Pessoa de Meia-Idade , Mutação , Terapia Neoadjuvante/efeitos adversos , Terapia Neoadjuvante/métodos , Taxoides/administração & dosagem , Taxoides/efeitos adversos , Neoplasias de Mama Triplo Negativas/classificação , Neoplasias de Mama Triplo Negativas/genética , Neoplasias de Mama Triplo Negativas/patologia
6.
S D Med ; 71(11): 501-504, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30742749

RESUMO

INTRODUCTION: The goal of this project was to implement a biopsychosocial approach to pain management and measure the effects on patient perception of pain. It was hypothesized that the intervention would positively impact patients' perception of pain. METHODS: A validated survey, the Revised American Pain Society Patient Outcome Questionnaire, was administered to patients on the day of discharge from Avera McKennan Hospital Orthopedics Unit 2-East and 2-West following total joint replacement. Prior to data collection, 2-East was renovated to create more welcoming and comfortable patient rooms. Pre-intervention data was gathered April through June of 2017. In July, a four-hour staff training session on alternative comfort measures and pain medication administration took place. Post-intervention data was gathered July through September of 2017. Data was analyzed via Microsoft Office Excel using t-test and chi-square analyses. RESULTS: Statistically significant improvement was seen on 2-East in pain severity and relief, least amount of pain reported, use of non-medicine methods, and impact of pain on sleep, activities, and negative emotions. Analysis of 2-East and 2-West combined revealed a decrease in overall pain, medication side effects, and impact of pain on sleep, activity, and negative emotions, although not statistically significant. In addition, there was an increase in helpfulness of information, ability to participate in decisions about pain management, and use of nonpharmacologic strategies, although not statistically significant. CONCLUSIONS: The study found outcomes consistent with the hypothesis, although not all results were statistically significant. The complementary use of nonpharmacologic interventions shows promise for improving patient experiences post-surgery. However, more research would be necessary to recommend the widespread implementation of these techniques.


Assuntos
Manejo da Dor/métodos , Dor Pós-Operatória/terapia , Emoções , Humanos , Dor/fisiopatologia , Dor/psicologia , Manejo da Dor/psicologia , Dor Pós-Operatória/fisiopatologia , Dor Pós-Operatória/psicologia , Percepção , Sono , Inquéritos e Questionários
7.
Emerg Radiol ; 23(4): 345-52, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27220653

RESUMO

The optimal assessment of patients with chest pain and possible acute coronary syndrome (ACS) remains a diagnostic dilemma for emergency physicians. Cardiac computed tomographic angiography (CCTA) may identify patients who can be safely discharged home from the emergency department (ED). The objective of the study was to compare the efficiency and safety of CCTA to standard care in patients presenting to the ED with low- to intermediate-risk chest pain. This was a single-center before-after study enrolling ED patients with chest pain and low to intermediate risk of ACS, before and after implementing a cardiac CT-based management protocol. The primary outcome was efficiency (time to diagnosis). Secondary outcomes included safety (30-day incidence of major adverse cardiovascular events (MACE)) and length of stay in the ED. We enrolled 258 patients: 130 in the standard care group and 128 in the cardiac CT-based management group. The cardiac CT group had a shorter time to diagnosis of 7.1 h (IQR 5.8-14.0) compared to 532.9 h (IQR 312.8-960.5) for the standard care group (p < 0.0001) but had a longer length of stay in the ED of 7.9 h (IQR 6.5-10.8) versus 5.5 h (IQR 3.9-7.7) (p < 0.0001). The MACE rate was 1.6 % in the standard care group and 0 % in the cardiac CT group. In conclusion, a cardiac CT-based management strategy to rule out ACS in ED patients with low- to intermediate-risk chest pain was safe and led to a shorter time to diagnosis but increased length of stay in the ED.


Assuntos
Dor no Peito/diagnóstico por imagem , Angiografia por Tomografia Computadorizada , Angiografia Coronária , Síndrome Coronariana Aguda/diagnóstico por imagem , Canadá , Meios de Contraste , Diagnóstico Diferencial , Serviço Hospitalar de Emergência , Feminino , Humanos , Iohexol , Tempo de Internação/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Medição de Risco
8.
Artigo em Inglês | MEDLINE | ID: mdl-38981117

RESUMO

OBJECTIVES: We describe new curriculum materials for engaging secondary school students in exploring the "big data" in the NIH All of Us Research Program's Public Data Browser and the co-design processes used to collaboratively develop the materials. We also describe the methods used to develop and validate assessment items for studying the efficacy of the materials for student learning as well as preliminary findings from these studies. MATERIALS AND METHODS: Secondary-level biology teachers from across the United States participated in a 2.5-day Co-design Summer Institute. After learning about the All of Us Research Program and its Data Browser, they collaboratively developed learning objectives and initial ideas for learning experiences related to exploring the Data Browser and big data. The Genetic Science Learning Center team at the University of Utah further developed the educators' ideas. Additional teachers and their students participated in classroom pilot studies to validate a 22-item instrument that assesses students' knowledge. Educators completed surveys about the materials and their experiences. RESULTS: The "Exploring Big Data with the All of Us Data Browser" curriculum module includes 3 data exploration guides that engage students in using the Data Browser, 3 related multimedia pieces, and teacher support materials. Pilot testing showed substantial growth in students' understanding of key big data concepts and research applications. DISCUSSION AND CONCLUSION: Our co-design process provides a model for educator engagement. The new curriculum module serves as a model for introducing secondary students to big data and precision medicine research by exploring diverse real-world datasets.

9.
Toxicol Pathol ; 41(3): 519-27, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-22700648

RESUMO

Repeated bolus intravenous (IV) administration of large doses of beta-lactams and aminoglycosides has previously been associated with the development of eosinophilic and occlusive arterial lesions limited to the lungs in calves. Reviewing 13 years worth of records from left ventricular assist device implantation studies, morphologically identical segmental arterial lesions were present in 32 of the 56 calves receiving IV antibiotics, affecting lungs (6/50), kidneys (12/56), or lungs and kidneys (14/50). In 16 of these calves, renal arterial lesions spatially colocalized with renal cortical infarctions. Lesions were noted in additional abdominal organs in 4 of the 50 calves and were exclusively present in the liver in a single calf. Similar arterial lesions were also noted in the lungs (3/4), kidneys (1/4), liver (1/4), and spleen (1/4) of unimplanted calves receiving similar IV antibiotic regimens for bacterial infections. Lesions were observed with therapeutic IV doses of cephalosporins with or without aminoglycosides over shorter intervals than previously implicated. Lesions were significantly associated with increased peripheral eosinophil counts and mildly elevated, not reduced, arterial pulse pressures. This report documents the features of an idiosyncratic drug reaction with features strongly suggestive of an acute type-I hypersensitivity in this species.


Assuntos
Antibacterianos/efeitos adversos , Arterite/induzido quimicamente , Eosinofilia/induzido quimicamente , Coração Auxiliar , Animais , Arterite/etiologia , Arterite/fisiopatologia , Pressão Sanguínea , Bovinos , Ensaios Clínicos como Assunto , Eosinofilia/etiologia , Eosinofilia/fisiopatologia , Eosinófilos/citologia , Eosinófilos/efeitos dos fármacos , Infarto/patologia , Rim/irrigação sanguínea , Rim/patologia , Córtex Renal/irrigação sanguínea , Córtex Renal/patologia , Contagem de Leucócitos , Pulmão/irrigação sanguínea , Pulmão/patologia , Masculino , Artéria Pulmonar/patologia , beta-Lactamas/efeitos adversos
10.
Cell Rep ; 42(8): 112942, 2023 08 29.
Artigo em Inglês | MEDLINE | ID: mdl-37561630

RESUMO

Zika virus (ZIKV) is an emerging pathogen that causes devastating congenital defects. The overlapping epidemiology and immunologic cross-reactivity between ZIKV and dengue virus (DENV) pose complex challenges to vaccine design, given the potential for antibody-dependent enhancement of disease. Therefore, classification of ZIKV-specific antibody targets is of notable value. From a ZIKV-infected rhesus macaque, we identify ZIKV-reactive B cells and isolate potent neutralizing monoclonal antibodies (mAbs) with no cross-reactivity to DENV. We group these mAbs into four distinct antigenic groups targeting ZIKV-specific cross-protomer epitopes on the envelope glycoprotein. Co-crystal structures of representative mAbs in complex with ZIKV envelope glycoprotein reveal envelope-dimer epitope and unique dimer-dimer epitope targeting. All four specificities are serologically identified in convalescent humans following ZIKV infection, and representative mAbs from all four groups protect against ZIKV replication in mice. These results provide key insights into ZIKV-specific antigenicity and have implications for ZIKV vaccine, diagnostic, and therapeutic development.


Assuntos
Vírus da Dengue , Dengue , Vacinas Virais , Infecção por Zika virus , Zika virus , Humanos , Animais , Camundongos , Anticorpos Neutralizantes , Epitopos , Macaca mulatta , Anticorpos Antivirais , Anticorpos Monoclonais , Vacinas Virais/uso terapêutico , Proteínas do Envelope Viral/química
12.
ACS Nano ; 16(8): 11988-11997, 2022 Aug 23.
Artigo em Inglês | MEDLINE | ID: mdl-35943245

RESUMO

Here we demonstrate a dramatic improvement in Ti/Au ohmic contact performance by utilizing the anisotropic nature of ß-Ga2O3. Under a similar doping concentration, Ti/Au metallization on (100) Ga2O3 shows a specific contact resistivity 5.11 × 10-5 Ω·cm2, while that on (010) Ga2O3 is as high as 3.29 × 10-3 Ω·cm2. Temperature-dependent contact performance and analyses suggest that field emission or thermionic field emission is the dominant charge transport mechanism across the Ti/Au-(100) Ga2O3 junction, depending on whether reactive ion etching was used prior to metallization. Cross-sectional high-resolution microscopy and elemental mapping analysis show that the in situ-formed Ti-TiOx layer on (100) Ga2O3 is relatively thin (2-2.5 nm) and homogeneous, whereas that on (010) substrates is much thicker (3-5 nm) and shows nanoscale facet-like features at the interface. The anisotropic nature of monoclinic Ga2O3, including anisotropic surface energy and mass diffusivity, is likely to be the main cause of the differences observed under microscopy and in electrical properties. The findings here provide direct evidence and insights into the dependence of device performance on the atomic-scale structural anisotropy of ß-Ga2O3. Moreover, the investigative strategy here─combining comprehensive electrical and materials characterization of interfaces on different semiconductor orientations─can be applied to assess a variety of other anisotropic oxide junctions.

13.
Thorac Surg Clin ; 31(3): 283-292, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34304836

RESUMO

In this review, the authors describe the imaging characteristics of solid and subsolid nodules as well as their management recommendations including the use of image-guided percutaneous biopsy and preoperative coil localization. Using case presentations, they offer practical management tips for the most commonly encountered nodule nodules in a thoracic surgical practice.


Assuntos
Nódulos Pulmonares Múltiplos , Lesões Pré-Cancerosas , Nódulo Pulmonar Solitário , Humanos , Pulmão , Neoplasias Pulmonares/diagnóstico por imagem , Nódulos Pulmonares Múltiplos/diagnóstico por imagem , Radiologistas , Nódulo Pulmonar Solitário/diagnóstico por imagem , Tomografia Computadorizada por Raios X
14.
ACS Appl Mater Interfaces ; 12(41): 46277-46287, 2020 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-32954727

RESUMO

Stable ohmic contacts are critical to enable efficient operation of high-voltage electronic devices using ultrawide bandgap semiconductors. Here we perform, for the first time, thermally accelerated aging of Ti/Au ohmic interfaces to (010) ß-Ga2O3. We find that a heavily doped semiconductor, doped n-type by Si-ion implantation, treated with reactive ion etch (RIE), results in a low specific contact resistance of ∼10-5 Ω cm2 that is stable upon accelerated thermal aging at 300 °C for 108 h. The low resistance interface is due to thermionic field emission of electrons over an inhomogeneous barrier. Scanning/transmission electron microscopy indicates that the multi-layered structure and elemental distribution across the contact interface, formed during a 1 min 470 °C post-metallization anneal, do not change noticeably over the aging period. A ∼1 nm interfacial layer is observed by high-resolution microscopy at the Ti-TiOx/Ga2O3 interface on all samples exposed to RIE, which may contribute to their excellent stability. In addition, longer-range facet-like interfacial features are observed, which may contribute to the inhomogeneous barrier. In contrast, Ti/Au junctions to moderately doped (010) Ga2O3 made with no RIE treatment exhibit a high contact resistance that increases upon accelerated aging, along with a partially lattice-matched interface. The methods used here to understand the process, structure, and electrical property relationships for Ti/Au contact interfaces to ß-Ga2O3 can be applied to assess and tune the stability of a variety of other oxide-semiconductor interfaces.

15.
ACS Nano ; 14(12): 17262-17272, 2020 Dec 22.
Artigo em Inglês | MEDLINE | ID: mdl-33216539

RESUMO

There is an increasing interest in additive nanomanufacturing processes, which enable customizable patterning of functional materials and devices on a wide range of substrates. However, there are relatively few techniques with the ability to directly 3D print patterns of functional materials with sub-micron resolution. In this study, we demonstrate the use of additive electrohydrodynamic jet (e-jet) printing with an average line width of 312 nm, which acts as an inhibitor for area-selective atomic layer deposition (AS-ALD) of a range of metal oxides. We also demonstrate subtractive e-jet printing with solvent inks that dissolve polymer inhibitor layers in specific regions, which enables localized AS-ALD within those regions. The chemical selectivity and morphology of e-jet patterned polymers towards binary and ternary oxides of ZnO, Al2O3, and SnO2 were quantified using X-ray photoelectron spectroscopy, atomic force microscopy, and Auger electron spectroscopy. This approach enables patterning of functional oxide semiconductors, insulators, and transparent conducting oxides with tunable composition, Å-scale control of thickness, and sub-µm resolution in the x-y plane. Using a combination of additive and subtractive e-jet printing with AS-ALD, a thin-film transistor was fabricated using zinc-tin-oxide for the semiconductor channel and aluminum-doped zinc oxide as the source and drain electrical contacts. In the future, this technique can be used to print integrated electronics with sub-micron resolution on a variety of substrates.

16.
Artif Organs ; 33(11): 953-7, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-19849686

RESUMO

In March 2004, the National Heart, Lung, and Blood Institute awarded five contracts to develop devices providing circulatory support for infants and small children with congenital and acquired cardiac disease. Since 2004, the team at Penn State College of Medicine has developed a pneumatically actuated ventricular assist device (VAD) with mechanical tilting disk valves. To date, hemodynamic performance, thrombogenesis, and hemolysis have been chronically evaluated in 16 animals, including 4 pygmy goats and 12 sheep. Major complications, mainly respiratory failure, have been encountered and resolved by a multi-disciplinary team. Multi-modal analgesia, appropriate antibiotic therapy, and attentive animal care have contributed to successful outcomes. Time after implant has ranged from 0 to 40 days. Most recently, a sheep implanted with Version 3 Infant VAD was electively terminated at 35 days postimplant, with no major adverse events. This report describes a successful in vivo model for evaluating a pediatric VAD.


Assuntos
Implante de Prótese de Valva Cardíaca , Coração Auxiliar , Modelos Animais , Pediatria/instrumentação , Animais , Feminino , Masculino , Ovinos
17.
Cell Host Microbe ; 26(5): 591-600.e4, 2019 11 13.
Artigo em Inglês | MEDLINE | ID: mdl-31668877

RESUMO

Maternal infection with Zika virus (ZIKV) can lead to microcephaly and other congenital abnormalities of the fetus. Although ZIKV vaccines that prevent or reduce viremia in non-pregnant mice have been described, a maternal vaccine that provides complete fetal protection would be desirable. Here, we show that adenovirus (Ad) vector-based ZIKV vaccines induce potent neutralizing antibodies that confer robust maternal and fetal protection against ZIKV challenge in pregnant, highly susceptible IFN-αßR-/- mice. Moreover, passive transfer of maternal antibodies from vaccinated dams protected pups against post-natal ZIKV challenge. These data suggest that Ad-based ZIKV vaccines may be able to provide protection in pregnant females against fetal ZIKV transmission in utero as well as in infants against ZIKV infection after birth.


Assuntos
Anticorpos Neutralizantes/sangue , Imunidade Materno-Adquirida/imunologia , Receptor de Interferon alfa e beta/genética , Vacinas Virais/imunologia , Infecção por Zika virus/prevenção & controle , Zika virus/imunologia , Adenoviridae/genética , Adenoviridae/imunologia , Animais , Anticorpos Neutralizantes/imunologia , Anticorpos Antivirais/sangue , Anticorpos Antivirais/imunologia , Linhagem Celular , Chlorocebus aethiops , Modelos Animais de Doenças , Feminino , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos C57BL , Camundongos Knockout , Gravidez , Vacinação , Células Vero , Infecção por Zika virus/imunologia
18.
Science ; 365(6457): 1029-1033, 2019 09 06.
Artigo em Inglês | MEDLINE | ID: mdl-31488689

RESUMO

Sustained virologic control of human immunodeficiency virus type 1 (HIV-1) infection after discontinuation of antiretroviral therapy (ART) is a major goal of the HIV-1 cure field. A recent study reported that administration of an antibody against α4ß7 induced durable virologic control after ART discontinuation in 100% of rhesus macaques infected with an attenuated strain of simian immunodeficiency virus (SIV) containing a stop codon in nef We performed similar studies in 50 rhesus macaques infected with wild-type, pathogenic SIVmac251. In animals that initiated ART during either acute or chronic infection, anti-α4ß7 antibody infusion had no detectable effect on the viral reservoir or viral rebound after ART discontinuation. These data demonstrate that anti-α4ß7 antibody administration did not provide therapeutic efficacy in the model of pathogenic SIVmac251 infection of rhesus macaques.


Assuntos
Anticorpos Monoclonais/uso terapêutico , Anticorpos Antivirais/uso terapêutico , Integrina alfa4/imunologia , Cadeias beta de Integrinas/imunologia , Síndrome de Imunodeficiência Adquirida dos Símios/terapia , Síndrome de Imunodeficiência Adquirida dos Símios/virologia , Vírus da Imunodeficiência Símia/genética , Vírus da Imunodeficiência Símia/imunologia , Animais , Antirretrovirais/uso terapêutico , Anticorpos Monoclonais/administração & dosagem , Anticorpos Antivirais/administração & dosagem , Códon de Terminação , DNA Viral/sangue , Infecções por HIV/terapia , Macaca mulatta , Síndrome de Imunodeficiência Adquirida dos Símios/sangue , Síndrome de Imunodeficiência Adquirida dos Símios/tratamento farmacológico , Vírus da Imunodeficiência Símia/fisiologia , Carga Viral , Proteínas Virais Reguladoras e Acessórias/genética , Proteínas Virais Reguladoras e Acessórias/imunologia
19.
AJR Am J Roentgenol ; 191(6): 1725-9, 2008 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-19020242

RESUMO

OBJECTIVE: Transthoracic fine-needle aspiration is an accurate and safe method for diagnosis of pulmonary lesions, and pneumothorax is the most frequent complication of the procedure. Crossing a lung fissure during biopsy has been thought to increase the risk of pneumothorax, and the need to cross a fissure is considered a relative contraindication. The purpose of this study was to assess the incidence and clinical significance of pneumothorax during needle aspiration biopsy performed with a transfissural approach in comparison with biopsies in which a fissure was not crossed. MATERIALS AND METHODS: Retrospective review of the medical records of patients who underwent fluoroscopically guided transthoracic biopsy of pulmonary nodules with a 25-gauge needle yielded the cases of 107 consecutively registered patients (59 men, 48 women; mean age, 62 years). In 43 of the biopsies, the major fissure was crossed, and in 64 biopsies, the control procedures, the fissure was avoided. CT scans were assessed for lesion size and location, biopsy approach, length of needle path, number of needle punctures, and presence of emphysema. RESULTS: Pneumothorax occurred in 11 patients (25%) in the transfissural biopsy group and in 19 patients (30%) in the group in which the fissure was avoided (p = 0.64). Pneumothorax necessitated chest tube placement in two patients (5%) in the transfissural biopsy group and seven patients (11%) in the control group (p = 0.25). In both groups, emphysema in the needle path was associated with increased risk of pneumothorax (p < 0.01). CONCLUSION: Transthoracic needle biopsy with an ultrathin needle that crosses a lung fissure can be safely performed without increasing the rate of pneumothorax or the need for chest tube insertion.


Assuntos
Biópsia por Agulha Fina/estatística & dados numéricos , Pulmão/diagnóstico por imagem , Pulmão/patologia , Pneumotórax/diagnóstico por imagem , Pneumotórax/epidemiologia , Radiografia Intervencionista/estatística & dados numéricos , Medição de Risco/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , Ontário/epidemiologia , Estudos Retrospectivos , Fatores de Risco
20.
Arch Suicide Res ; 12(2): 161-9, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-18340599

RESUMO

This study attempted to predict reactions after listening to music with lyrics about suicide. One hundred and twenty-six volunteers completed self-reports of personality and mood, and then listened to the music. Afterwards, they completed projective stories, self-reports of moods and reactions, and a memory test for the lyrics. Low openness to experience, and to a lesser extent, high neuroticism and low self-esteem predicted higher levels of suicide-related content in projective story-writing, as did knowing a suicide victim. Both the personality measures and post-listening mood predicted remembering too many nihilistic lyrics. Surprisingly, 68% of participants wrote at least one projective story with altruistic content. Individual differences were modestly associated with suicidal thoughts after listening to the music.


Assuntos
Música , Semântica , Suicídio , Vocabulário , Adolescente , Adulto , Afeto , Cognição , Feminino , Comportamento de Ajuda , Humanos , Masculino , Inquéritos e Questionários
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