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1.
IEEE Trans Image Process ; 30: 2643-2655, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33523812

RESUMO

The outpainting results produced by existing approaches are often too random to meet users' requirements. In this work, we take the image outpainting one step forward by allowing users to harvest personal custom outpainting results using sketches as the guidance. To this end, we propose an encoder-decoder based network to conduct sketch-guided outpainting, where two alignment modules are adopted to impose the generated content to be realistic and consistent with the provided sketches. First, we apply a holistic alignment module to make the synthesized part be similar to the real one from the global view. Second, we reversely produce the sketches from the synthesized part and encourage them be consistent with the ground-truth ones using a sketch alignment module. In this way, the learned generator will be imposed to pay more attention to fine details and be sensitive to the guiding sketches. To our knowledge, this work is the first attempt to explore the challenging yet meaningful conditional scenery image outpainting. We conduct extensive experiments on two collected benchmarks to qualitatively and quantitatively validate the effectiveness of our approach compared with the other state-of-the-art generative models.

2.
Biomed Microdevices ; 23(1): 6, 2021 Jan 09.
Artigo em Inglês | MEDLINE | ID: mdl-33420838

RESUMO

Underwater robot designs inspired by the behavior and morphological characteristics of aquatic animals can provide reinforced mobility and energy efficiency. In the past two decades, the emerging materials science and integrated circuit technology have been combined and applied to various types of bionic soft underwater miniaturized robots by researchers around the world. Further, the potential applications of biomimetic soft micro-swimmers in the biological and medical fields have been explored. Here, this paper reviews the development of biomimetic soft tiny swimmers, which are designed based on a variety of intelligent materials and control strategies. This review focuses on the various actuation mechanisms of soft tiny swimmers reported in the past two decades and classifies these robots into four categories: fish-like, snake-like, jellyfish-like and microbial-inspired ones. Besides, this review considers the practical challenges faced by actuation mechanisms of each type of robot, and summarizes and prospects how these challenges affect the potential applications of robots in real environments.

3.
ACS Omega ; 5(43): 28212-28223, 2020 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-33163804

RESUMO

The CuO-La2O3/ZrO2 catalysts calcined at different temperatures from 500 to 800 °C were studied for the hydrogenation of oxalates to ethylene glycol (EG). Along with the increase of calcination temperatures, the BET surface area, pore volume, and Cu dispersion decreased, whereas the crystallite sizes of Cu species increased. Interestingly, the superior performance such as a 98% selectivity of EG in dimethyl oxalate hydrogenation or a 96.5% selectivity of EG in diethyl oxalate hydrogenation was obtained over the catalyst calcined at 700 °C. Essentially, the surface synergism between Cu species and monoclinic ZrO2 was enhanced by the higher calcination temperature, resulting in the remarkable surface adsorption and activation of H2. Besides, the increase of calcination temperature significantly reduced the surface acidity and basicity, which could effectively suppress the byproduct formation.

4.
Zhongguo Gu Shang ; 33(10): 938-42, 2020 Oct 25.
Artigo em Chinês | MEDLINE | ID: mdl-33107257

RESUMO

OBJECTIVE: To explore clinical and radiographic effects of percutaneous pie-crusting deep medial collateral ligament release in patients with posterior horn tear of medial meniscus combined with tight medial compartment. METHODS: From January 2012 to December 2016, 35 patients with medial meniscus posterior horn injury were treated with percutaneous pie crusting deep medial collateral ligament release technique, including 21 males and 14 females, aged from 21 to 55 years old with an average of (39.1±6.5) years old. Degree of meniscus extrusion were recorded before and 24 months after operation. The knee valgus stress test was performed to evaluate stability of medial collateral ligament, and compared difference between healthy and affected side. Lysholm and IKDC functional scores were compared before and 24 months after operation. RESULTS: All patients were followed up from 27 to 60 months with an average of (36.7±6.8) months. All patients were underwent operation, the wound healed well without complications. Operative time ranged from 0.5 to 1.2 h with an average of (0.8±0.4) h. Nineteen patients were performed partial meniscectomy, 16 patients were performed repair suture. Convex of meniscus before operation was (1.5±0.7) mm, and (1.7±0.4) mm after operation;had no statistical difference(P>0.05). Lysholm score was improved from 53.4±8.8 before operation to 91.5±4.6 at 24 months after operation;IKDC score was increased from 50.7±9.2 before operation to 90.6±3.9 at 24 months after operation;there was statistically significant (P<0.05). Valgus stress test was performed on 0 ° and 30 ° position of knee flexion in affected side and compared with ipsilateral side, all patients showed negative. CONCLUSION: For patients with medial meniscus tear of posterior horn combined with tight medial compartment, percutaneous pie-crusting deep medial collateralligament release could improve medial compartment space, and Knee valgus instability and meniscus extrusion are not affected.


Assuntos
Ligamentos Colaterais , Instabilidade Articular , Adulto , Artroscopia , Feminino , Humanos , Articulação do Joelho/cirurgia , Masculino , Meniscos Tibiais/cirurgia , Pessoa de Meia-Idade , Adulto Jovem
5.
Polymers (Basel) ; 12(4)2020 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-32260248

RESUMO

Silica aerogels can be strengthened by forming a nanoscale interpenetrating network (IPN) comprising a silica gel skeleton and a cellulose nanofiber network. Previous studies have demonstrated the effectiveness of this method for improving the mechanical properties and drying of aerogels. However, the preparation process is generally tedious and time-consuming. This study aims to streamline the preparation process of these composite aerogels. Silica alcosols were directly diffused into cellulose wet gels with loose, web-like microstructures, and an IPN structure was gradually formed by regulating the gelation rate. Supercritical CO2 drying followed to obtain composite aerogels. The mechanical properties were further enhanced by a simple secondary regulation process that increased the quantity of bacterial cellulose (BC) nanofibers per unit volume of the matrix. This led to the production of aerogels with excellent bendability and a high tensile strength. A maximum breaking stress and tensile modulus of 3.06 MPa and 46.07 MPa, respectively, were achieved. This method can be implemented to produce robust and bendable silica-based composite aerogels (CAs).

6.
Medicine (Baltimore) ; 98(24): e16011, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31192948

RESUMO

RATIONALE: Upper pole sleeve fractures of the patella are rare in adolescents; however, they are serious injuries that require early diagnosis and treatment. PATIENT CONCERNS: We present a rare case of a 15-year-old girl who suffered a sleeve fracture at the superior pole of the right patella. The patient had a history of dislocation of the patella 2 weeks ago. Physical examination showed tenderness on palpation over the upper pole of the patella and absence of active movement of the knee accompanied by swelling and joint effusion. A plain radiograph showed an avulsed fragment of the superior pole of the patella. DIAGNOSES: Magnetic resonance imaging showed a superior pole patellar avulsion fracture and dysfunction of the knee extensor mechanism. INTERVENTIONS: Under general anesthesia, the patient underwent open surgery for reduction of the patellar fracture and reconstruction of the knee extension apparatus through an anterior approach. OUTCOMES: Six months after the operation, the knee function was fully restored, there was absence of pain and swelling, and the patient was able to return to sports. LESSONS: Upper pole sleeve fracture of the patella is usually serious and it needs to be diagnosed and treated as soon as possible, the sports medicine practitioner must be aware of this type of injury.


Assuntos
Fraturas Ósseas/cirurgia , Patela/lesões , Patela/cirurgia , Luxação Patelar/complicações , Luxação Patelar/cirurgia , Adolescente , Diagnóstico Diferencial , Feminino , Fraturas Ósseas/diagnóstico por imagem , Humanos , Patela/diagnóstico por imagem , Luxação Patelar/diagnóstico por imagem
7.
Small ; 14(47): e1802913, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30307704

RESUMO

Massive volume change of active materials in lithium/sodium ion batteries (LIB/SIB) causes severe structural collapse of electrodes and fast capacity decay of batteries. Here, a coaxial composite of single-wall carbon nanotube bundle (SWCNTB/SnO2 ) nanoparticles (NPs)/N-doped carbon shell (SWCNTB@SnO2 @C) is constructed, where SWCNTBs with exceptional elasticity are explored as a self-adaptive substrate to supply a highly resilient conductive network. Within the confinement of hard carbon shells, SWCNTB can produce radially elastic deformation to accommodate the volume change of SnO2 during Li+ /Na+ insertion/extraction. This overcomes the problem of strain fracturing of the outer carbon shell, as well as maintains close electrical contact between SnO2 and the conductive network. The LIB/SIB with the self-adaptive SWCNTB@SnO2 @C electrode presents a series of superior battery performances, for example, a high specific capacity of 608 mAh g-1 at 10 A g-1 and 600 cycles in LIB without capacity decay.

8.
Org Lett ; 20(17): 5224-5227, 2018 09 07.
Artigo em Inglês | MEDLINE | ID: mdl-30146886

RESUMO

A novel [3 + 2] cycloaddition between nitrile ylides and diazonium salts was well-established. This copper-catalyzed three-component reaction was distinguished by mild conditions, ready availability, and operational simplicity, thus opening access to 1,2,4-triazoles with a diverse set of substitution patterns.

9.
IEEE Trans Image Process ; 27(9): 4437-4451, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29897870

RESUMO

As the image sharing websites like Flickr become more and more popular, extensive scholars concentrate on tag-based image retrieval. It is one of the important ways to find images contributed by social users. In this research field, tag information and diverse visual features have been investigated. However, most existing methods use these visual features separately or sequentially. In this paper, we propose a global and local visual features fusion approach to learn the relevance of images by hypergraph approach. A hypergraph is constructed first by utilizing global, local visual features, and tag information. Then, we propose a pseudo-relevance feedback mechanism to obtain the pseudo-positive images. Finally, with the hypergraph and pseudo relevance feedback, we adopt the hypergraph learning algorithm to calculate the relevance score of each image to the query. Experimental results demonstrate the effectiveness of the proposed approach.

10.
Nanoscale Res Lett ; 13(1): 78, 2018 Mar 07.
Artigo em Inglês | MEDLINE | ID: mdl-29516262

RESUMO

A hydrothermal method for synthesizing ultralong and thin copper nanowires (CuNWs) with average diameter of 35 nm and average length of 100 µm is demonstrated in this paper. The concerning raw materials include copric (II) chloride dihydrate (CuCl2·2H2O), octadecylamine (ODA), and ascorbic acid, which are all very cheap and nontoxic. The effect of different reaction time and different molar ratios to the reaction products were researched. The CuNWs prepared by the hydrothermal method were applied to fabricate CuNW transparent conductive electrode (TCE), which exhibited excellent conductivity-transmittance performance with low sheet resistance of 26.23 [Formula: see text] and high transparency at 550 nm of 89.06% (excluding Polyethylene terephthalate (PET) substrate). The electrode fabrication process was carried out at room temperature, and there was no need for post-treatment. In order to decrease roughness and protect CuNW TCEs against being oxidized, we fabricated CuNW/poly(methyl methacrylate) (PMMA) hybrid TCEs (HTCEs) using PMMA solution. The CuNW/PMMA HTCEs exhibited low surface roughness and chemical stability as compared with CuNW TCEs.

11.
IEEE Trans Image Process ; 26(8): 3734-3747, 2017 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28463199

RESUMO

Social media sharing Websites allow users to annotate images with free tags, which significantly contribute to the development of the web image retrieval. Tag-based image search is an important method to find images shared by users in social networks. However, how to make the top ranked result relevant and with diversity is challenging. In this paper, we propose a topic diverse ranking approach for tag-based image retrieval with the consideration of promoting the topic coverage performance. First, we construct a tag graph based on the similarity between each tag. Then, the community detection method is conducted to mine the topic community of each tag. After that, inter-community and intra-community ranking are introduced to obtain the final retrieved results. In the inter-community ranking process, an adaptive random walk model is employed to rank the community based on the multi-information of each topic community. Besides, we build an inverted index structure for images to accelerate the searching process. Experimental results on Flickr data set and NUS-Wide data sets show the effectiveness of the proposed approach.

12.
Org Lett ; 18(19): 5082-5085, 2016 10 07.
Artigo em Inglês | MEDLINE | ID: mdl-27644333

RESUMO

A new cross-coupling reaction between sulfonyl hydrazides and diazo compounds has been established, leading to a variety of ß-carbonyl sulfones in good yields. This methodology was distinguished by simple manipulation, easily available starting materials, and wide substrate scope. A plausible mechanism involving a radical process was proposed based upon the experimental observations and literature.

13.
Org Biomol Chem ; 13(13): 3982-7, 2015 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-25722069

RESUMO

A transition-metal-free decarboxylation coupling process for the preparation of α-amino acid esters, which succeeded in merging hydrolysis/decarboxylation/nucleophilic substitution, is well described. This strategy uses commercially available inexpensive starting materials, catalysts and oxidants and has a wide substrate scope and operational simplicity.


Assuntos
Aminoácidos/química , Malonatos/química , Peróxidos/química , Compostos de Amônio Quaternário/química , Aminas/química , Catálise , Descarboxilação , Ésteres , Oxidantes/química
14.
Angew Chem Int Ed Engl ; 54(4): 1231-5, 2015 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-25425423

RESUMO

The interception of cobalt-based carbene radicals with α-aminoalkyl radicals was combined with the Kornblum-DeLaMare reaction and provides ß-ester-γ-amino ketones, which are otherwise difficult to obtain in high chemoselectivity. Mechanistically, this transformation is an interplay of cobalt-based carbene radicals, organoradicals, and ionic intermediates and involves the construction of two C-C bonds and one C=O bond in a one-pot process. The reaction also features a wide substrate scope and is highly efficient and insensitive to moisture and air.

15.
Yao Xue Xue Bao ; 49(9): 1346-52, 2014 Sep.
Artigo em Chinês | MEDLINE | ID: mdl-25518337

RESUMO

Artemisnin is a novel sesquiterpene lactone with an internal peroxide bridge structure, which is extracted from traditional Chinese herb Artemisia annua L. (Qinghao). Recommended by World Health Organization, artemisinin is the first-line drug in the treatment of encephalic and chloroquine-resistant malaria. In the present study, transgenic A. annua plants were developed by overexpressing the key enzymes involved in the biosynthetic pathway of artemisinin. Based on Agrobacterium-mediated transformation methods, transgenic plants of A. annua with overexpression of both HDR and ADS were obtained through hygromycin screening. The genomic PCR analysis confirmed six transgenic lines in which both HDR and ADS were integrated into genome. The gene expression analysis given by real-time quantitative PCR showed that all the transgenic lines had higher expression levels of HDR and ADS than the non-transgenic control (except ah3 in which the expression level of ADS showed no significant difference compared with control); and the HPLC analysis of artemisinin demonstrated that transgenic A. annua plants produced artemisinin at significantly higher level than non-transgenic plants. Especially, the highest content of artemisinin was found in transgenic line ah70, in which the artemisinin content was 3.48 times compared with that in non-transgenic lines. In summary, overexpression of HDR and ADS facilitated artemisinin biosynthesis and this method could be applied to develop transgenic plants of A. annua with higher yield of artemisinin.


Assuntos
Artemisia annua/metabolismo , Artemisininas/metabolismo , Artemisia annua/genética , Vias Biossintéticas , Medicamentos de Ervas Chinesas , Oxigenases de Função Mista/genética , Oxirredutases/genética , Proteínas de Plantas/genética , Plantas Geneticamente Modificadas/genética , Plantas Geneticamente Modificadas/metabolismo , Plantas Medicinais/genética , Plantas Medicinais/metabolismo
16.
Org Lett ; 16(24): 6350-3, 2014 Dec 19.
Artigo em Inglês | MEDLINE | ID: mdl-25474618

RESUMO

A new radical-polar crossover reaction has been developed involving the combination of a tandem radical reaction and Kornblum-DeLaMare rearrangement in a one-pot process. This simple methodology allows for the construction of polyfunctionalized carbonyl compounds via the oxidative coupling of 1,3-dioxolanes with electron-deficient alkenes and vinylarenes in the presence of Co(salen) and TBHP under mild conditions. This reaction also exhibited high functional group tolerance, wide substrate scope, and operational simplicity.

17.
Huan Jing Ke Xue ; 35(5): 1884-90, 2014 May.
Artigo em Chinês | MEDLINE | ID: mdl-25055682

RESUMO

Biochar was made from maize stalk under three different temperatures of 300, 500 and 700 degreeC. The elemental composition of biochar was measured by elemental analyzer. Scanning electron microscope (SEM) was used to measure the surface morphology. Sorption of naphthalene to biochar was researched by batch sorption experiments. Results showed that, with the increase of temperature, C content increased from 66. 79% to 76. 30% , H and O contents decreased from 4.92% and 19. 25% to 3. 18% and 9.53%, respectively; H/C, O/C, (O + N)/C, aromaticity and hydrophobicity increased, and polarity decreased. SEM results showed that maize stalk biochar was platy particles, and its roughness of surface increased with increasing temperature. The sorption of naphthalene on biochar followed the Lagergren pseudo-second order dynamic sorption model. Initial sorption rate and equilibrium sorption capacity increased as preparation temperatures increased at the same initial concentration of naphthalene. The isotherm sorption behavior can be described by the Freundlich model, which indicated that, as pyrolysis temperature increased, the sorption capacity of biochar increased, and nonlinearity increased first and then decreased. Biochar derived from maize stalk had distinct features when compared with other feedstocks, and its elemental composition, surface features and sorption behaviors were significantly influenced by pyrolysis temperature.


Assuntos
Carvão Vegetal/química , Naftalenos/química , Temperatura , Zea mays , Incineração , Caules de Planta
18.
Zhongguo Zhong Yao Za Zhi ; 39(1): 52-8, 2014 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-24754168

RESUMO

Atropa belladonna is a medicinal plant and main commercial source of tropane alkaloids (TAs) including scopolamine and hyoscyamine, which are anticholine drugs widely used clinically. Based on the high throughput transcriptome sequencing results, the digital expression patterns of UniGenes representing 9 structural genes (ODC, ADC, AIH, CPA, SPDS, PMT, CYP80F1, H6H, TRII) involved in TAs biosynthesis were constructed, and simultaneously expression analysis of 4 released genes in NCBI (PMT, CYP80F1, H6H, TRII) for verification was performed using qPCR, as well as the TAs contents detection in 8 different tissues. Digital expression patterns results suggested that the 4 genes including ODC, ADC, AIH and CPA involved in the upstream pathway of TAs, and the 2 branch pathway genes including SPDS and TRII were found to be expressed in all the detected tissues with high expression level in secondary root. While the 3 TAs-pathway-specific genes including PMT, CYP80F1, H6H were only expressed in secondary roots and primary roots, mainly in secondary roots. The qPCR detection results of PMT, CYP80F1 and H6H were consistent with the digital expression patterns, but their expression levels in primary root were too low to be detected. The highest content of hyoscyamine was found in tender stems (3.364 mg x g(-1)), followed by tender leaves (1.526 mg x g(-1)), roots (1.598 mg x g(-1)), young fruits (1.271 mg x g(-1)) and fruit sepals (1.413 mg x g(-1)). The highest content of scopolamine was detected in fruit sepals (1.003 mg x g(-1)), then followed by tender stems (0.600 mg x g(-1)) and tender leaves (0.601 mg x g(-1)). Both old stems and old leaves had the lowest content of hyoscyamine and scopolamine. The gene expression profile and TAs accumulation indicated that TAs in Atropa belladonna were mainly biosynthesized in secondary root, and then transported and deposited in tender aerial parts. Screening Atropa belladonna secondary root transcriptome database will facilitate unveiling the unknown enzymatic reactions and the mechanisms of transcriptional control.


Assuntos
Alcaloides/biossíntese , Alcaloides/genética , Atropa belladonna/genética , Atropa belladonna/metabolismo , Regulação da Expressão Gênica de Plantas/genética , Tropanos/metabolismo , Alcaloides/metabolismo , Hiosciamina/genética , Hiosciamina/metabolismo , Plantas Medicinais/genética , Plantas Medicinais/metabolismo , Escopolamina/metabolismo
19.
Yao Xue Xue Bao ; 48(2): 243-9, 2013 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-23672021

RESUMO

Atropa belladonna L. is the officially medicinal plant species and the main commercial source of scopolamine and hyoscyamine in China. In this study, we reported the simultaneous overexpression of two functional genes involved in biosynthesis of scopolamine, which respectively encoded the upstream key enzyme putrescine N-methyltransferase (PMT; EC 2.1.1.53) and the downstream key enzyme hyoscyamine 6beta-hydroxylase (H6H; EC 1.14.11.11) in transgenic hair root cultures of Atropa belladonna L. HPLC results suggested that four transgenic hair root lines produced higher content of scopolamine at different levels compared with nontransgenic hair root cultures. And scopolamine content increased to 8.2 fold in transgenic line PH2 compared with that of control line; and the other four transgenic lines showed an increase of scopolamine compared with the control. Two of the transgenic hair root lines produced higher levels of tropane alkaloids, and the content increased to 2.7 fold in transgenic line PH2 compared with the control. The gene expression profile indicated that both PMT and H6H expressed at a different levels in different transgenic hair root lines, which would be helpful for biosynthesis of scopolamine. Our studies suggested that overexpression of A. belladonna endogenous genes PMT and H6H could enhance tropane alkaloid biosynthesis.


Assuntos
Atropa belladonna , Metiltransferases/metabolismo , Oxigenases de Função Mista/metabolismo , Escopolamina/metabolismo , Biologia Sintética , Tropanos/metabolismo , Atropa belladonna/enzimologia , Atropa belladonna/genética , Regulação Enzimológica da Expressão Gênica , Regulação da Expressão Gênica de Plantas , Hiosciamina/metabolismo , Metiltransferases/genética , Oxigenases de Função Mista/genética , Raízes de Plantas/enzimologia , Raízes de Plantas/genética , Plantas Geneticamente Modificadas/enzimologia , Plantas Geneticamente Modificadas/genética , Plantas Medicinais/enzimologia , Plantas Medicinais/genética
20.
Antonie Van Leeuwenhoek ; 102(4): 689-94, 2012 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22763811

RESUMO

A novel Gram-positive, rod-shaped, motile, spore-forming, nitrogen-fixing bacterium, designated strain 7188(T), was isolated from jujube rhizosphere soil in Beijing, China. The strain grew at 4-40 °C and pH 6-12, with an optimum of 30 °C and pH 7.0, respectively. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain 7188(T) is a member of the genus Paenibacillus. Levels of 16S rRNA gene sequence similarities between strain 7188(T) and the type strains of all recognized members of the genus Paenibacillus were below 96 %. The major cellular fatty acids were anteiso-C(15:0), anteiso-C(17:0) and C(16:0). The predominant menaquinone was MK-7. The DNA G+C content of strain 7188(T) was 60.3 mol%. The major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and unknown aminophospholipids. The diamino acid in the cell wall peptidoglycan is meso-diaminopimelic acid. On the basis of these results, strain 7188(T) is considered to represent a novel species of the genus Paenibacillus, for which the name Paenibacillus beijingensis sp. nov. is proposed. The type strain is 7188(T) (=ACCC 03082(T) = DSM 24997(T)).


Assuntos
Fixação de Nitrogênio , Paenibacillus/isolamento & purificação , Paenibacillus/metabolismo , Microbiologia do Solo , Ziziphus/microbiologia , Técnicas de Tipagem Bacteriana , Composição de Bases , Parede Celular/química , China , Análise por Conglomerados , DNA Bacteriano/química , DNA Bacteriano/genética , DNA Ribossômico/química , DNA Ribossômico/genética , Ácido Diaminopimélico/análise , Ácidos Graxos/análise , Concentração de Íons de Hidrogênio , Locomoção , Dados de Sequência Molecular , Paenibacillus/classificação , Paenibacillus/genética , Peptidoglicano/química , Fosfolipídeos/análise , Filogenia , RNA Ribossômico 16S/genética , Análise de Sequência de DNA , Esporos Bacterianos/citologia , Temperatura , Vitamina K 2/análise
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