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1.
J Colloid Interface Sci ; 678(Pt A): 602-615, 2025 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-39216388

RESUMO

Selective catalytic oxidation of ammonia (NH3-SCO) has become an effective method to reduce ammonia (NH3) emissions, and is a key part to solve the problem of NH3 pollution. Nevertheless, the optimization of this technology's performance relies heavily on innovation and the development of catalyst design. In this study, a SmCuAgTiOx catalyst with an asymmetric Ag-Ov-Ti-Sm-Cu ring active site was prepared and applied to the NH3-SCO reaction. The low conversion of Cu-based catalysts in NH3 at low temperature and the inherent low N2 selectivity of Ag-based catalysts were solved. The successful creation of the asymmetric ring active site improved the catalyst's reduction performance. Additionally, Cu, acting as an electron transfer medium, plays a crucial role in enhancing electron transfer within the asymmetric ring active site, thus increasing the redox cycle of the catalyst during the reaction. In addition, some lattice oxygen is lost in the catalyst, resulting in the formation of a large number of oxygen vacancies. This process stimulates the adsorption and activation of surface-adsorbed oxygen, facilitating the conversion of NH3 to an amide (NH2) intermediate during the reaction and reducing non-selective oxidation. The N2 selectivity was improved without significantly affecting the performance of Ag-based catalyst. In-situ diffuse reflectance fourier transform infrared spectroscopy (In-situ DRIFTS) analysis reveals that the SmCuAgTiOx catalyst primarily follows an "internal" selective catalytic reduction (iSCR) mechanism in the NH3-SCO reaction, complemented by the imide mechanism. The asymmetric Ag-Ov-Ti-Sm-Cu ring active site developed in this study provides a new perspective for efficiently solving NH3 pollution in the future.

2.
Bioorg Chem ; 153: 107897, 2024 Oct 18.
Artigo em Inglês | MEDLINE | ID: mdl-39442461

RESUMO

Penisimplinoid A (1), the first andrastin-type meroterpenoid with an unprecedented 6/6/3/6/5/5 polycyclic systems, together with ten highly oxygenated andrastin-type meroterpenoids (2-11) and one known analogue (12), were co-isolated from the marine-derived fungus Penicillium simplicissimum. Their absolute configurations were determined by single-crystal X-ray diffraction analysis (Cu Kα), DP4+ probability analyses, and ECD quantum chemistry calculations. Biological evaluation revealed that 7 and 12 showed anti-inflammatory activities in the zebrafish assay, 6 exhibited cytotoxic activity against NCI-H446 tumor cells with an IC50 value of 6.49 µM, 7 and 11 exhibited significant promoting angio-genesis activities.

3.
Food Chem ; 463(Pt 1): 141080, 2024 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-39332052

RESUMO

Protein-polysaccharide interactions are crucial for food system structure and stability. This study investigates the interaction of Lycium barbarum polysaccharide (LBP) at 0-2.00 % concentrations with whey protein isolate (WPI), focusing on functionality and structural changes. LBP covalently grafted onto WPI, as confirmed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), forming WPI-LBP complexes with a maximum degree of grafting (DG) of 44.58 % at 2.00 % LBP. This grafting reduced WPI's surface hydrophobicity (H0) and improved solubility, emulsifying properties, and digestibility under certain conditions, with optimal antioxidant activity at 1.00 % LBP. Multispectral analysis and microscopy showed LBP grafting alters WPI's secondary, tertiary, crystalline, and micro/nanostructures. The comprehensive analysis indicates that the interaction between LBP and WPI involves covalent bonding, hydrogen bonding, hydrophobic interactions, and electrostatic forces, as supported by zeta potential and chemical forces results. These findings suggest LBP-protein complexes as promising food materials for enhancing functionality and stability in the food industry.

4.
Biosens Bioelectron ; 267: 116785, 2024 Sep 16.
Artigo em Inglês | MEDLINE | ID: mdl-39305821

RESUMO

High-affinity antibodies are crucial in biosensors, disease diagnostics, therapeutic drug development, and immunological analysis, making the enhancement of antibody affinity a key research focus within the field. Computer-aided design is recognized as a time-saving and labor-efficient method for nanobodies in vitro affinity maturation. Compared to experimental mutagenesis techniques, it is advantageous due to the elimination of the need for laborious library construction and screening processes. However, these approaches are constrained by structural prediction since inaccuracy in structure could readily result in maturation failures. Herein, a novel nanobodies modification method for in vitro affinity maturation, utilizing the high accuracy prediction of AlphaFold2, was employed to rapidly transform a low affinity nanobody against enrofloxacin (ENR) into one with high affinity. The molecular docking results revealed a 1.5- to 2.5-fold increase in the number of noncovalent interactions of modified nanobodies, accompanied by a reduction in binding free energy ranging from 14.1 to 62.6%. The evaluation results from ELISA and BLI indicated that the affinity of the modified nanobodies had been enhanced by 6.2-91.6 times compared to the template nanobody. Furthermore, the modified nanobodies were employed for the detection of ENR-spiked coastal fish samples. In summary, this research proposed a nanobodies modification method from a new perspective, endowing its great application potential in biosensors, food safety, and environmental monitoring.

5.
Nano Lett ; 24(39): 12111-12117, 2024 Oct 02.
Artigo em Inglês | MEDLINE | ID: mdl-39303046

RESUMO

GaAs heterojunction solar cells are known as promising substitutions for traditional GaAs solar cells for their low cost and performance potential. Nevertheless, the further performance enhancement is hindered by insufficient spectral absorption and nonradioactive recombination. In this work, an InP quantum dot (QD) modified GaAs/PEDOT:PSS solar cell is designed to enhance spectrum utilization and suppress the nonradioactive carriers loss and the solar cell efficiency at 15.08% is achieved. Furthermore, InP QDs used in this work are synthesized by a novel hydrothermal method. During the synthesis process, ß-cyclodextrin (ß-cyc) was introduced into the reactants and acted as a reaction cell, isolating water and oxygen, enabling the reaction to proceed in ambient air. InP QDs synthesized by this method can achieve band engineering by altering reactant ratios, thereby effectively serving as both a Luminescent Solar Concentrator (LSC) and a Front Surface Field (FSF) in GaAs/PEDOT:PSS solar cells. This work demonstrates an inspiring way to synthesize InP QDs and optimize the performance of GaAs hybrid solar cells.

6.
Sci Total Environ ; 954: 176429, 2024 Sep 24.
Artigo em Inglês | MEDLINE | ID: mdl-39326756

RESUMO

The conventional activator KOH poses issues of pollution and equipment corrosion in activated carbon production. This study proposes a low-cost, one-step synthetic method for the cleaner production of biomass-derived carbon. CO2 adsorbents with high specific surface area (550-1725 m2/g) and superior adsorption performance were prepared using a KCl-assisted activation process with three activators (KOH, KHCO3, K2CO3). The results demonstrated that KCl promoted the formation of a molten salt system in all the different activation processes, which improved the activation efficiency through the formation of a liquid-phase environment. The results show that KCl possesses both pore-creating and pore-modulating properties. We investigated the performance of the two properties and analyzed the influencing factors. Specifically, KCl increases the specific surface area and porosity of the material and also selectively increases the ultramicroporous content. The development and regulation of pore structure can be achieved through the selection of activator, temperature, and dosage of KCl. With the addition of KCl, the performance of the adsorbents in all systems improved due to optimized pore structure. Among them, the sample PB700-4 from KCl-assisted KHCO3 activation exhibited the highest CO2 adsorption of 4.51 mmol/g at 25 °C and 1 bar. The best sample, PC700-3, from the KCl-assisted K2CO3 activation system had an adsorption capacity of 4.48 mmol/g, which was superior to the best sample, PH800-3 (4.28 mmol/g), obtained from KCl-assisted KOH activation. Given the low corrosiveness and toxicity of KHCO3, K2CO3, and KCl, this study introduces a novel approach for cleaner production of activated carbons and advancements in gas separation technology.

7.
Int J Biol Macromol ; 279(Pt 2): 135291, 2024 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-39233174

RESUMO

Bacterial cellulose (BC) is an ideal candidate for wound dressings due to its natural origin, exceptional water-holding capacity, pliability, biocompatibility, and high absorption capability. However, the lack of essential antimicrobial activity limits its biomedical applications. This study reported BC-based wound dressings containing silk fibroin protein (SF), offering the potential for biomimetic properties, and (-)-epigallocatechin-3-gallate (EGCG) for polyphenol-assisted surface modification to promote infectious wound healing. Glycerol was used as the carbon source to promote the formation of an adhesive layer by facilitating the ß-sheet folding of SF, and different concentrations of EGCG were employed to interact with SF through strong hydrogen bonding facilitated by the polyphenolic groups. The functionalized membrane exhibited outstanding water-holding capacity, swelling ratio, and degradation properties, along with enhanced hydrophilicity, adhesiveness, and a remarkable free radical scavenging ability. Both in vitro and in vivo experiments confirmed its potent bacteriostatic activity. The composite membrane displayed excellent biocompatibility, including cellular and hemocompatibility. Importantly, it effectively promoted wound healing in murine back infections. These findings suggest the significant feasibility of the innovative modification approach, and that functionalized membranes have great potential as wound-dressing materials for infection management in future clinical applications.


Assuntos
Bandagens , Celulose , Polifenóis , Cicatrização , Cicatrização/efeitos dos fármacos , Celulose/química , Celulose/farmacologia , Polifenóis/química , Polifenóis/farmacologia , Animais , Camundongos , Antibacterianos/farmacologia , Antibacterianos/química , Fibroínas/química , Humanos , Infecção dos Ferimentos/tratamento farmacológico , Infecção dos Ferimentos/prevenção & controle , Materiais Biocompatíveis/química , Materiais Biocompatíveis/farmacologia
8.
Fitoterapia ; 178: 106151, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39098736

RESUMO

In present study, seventeen α-nitrile substituted guaiazulene-based chalcone derivatives including twelve new were designed, synthesized, and assayed for antiviral, cytotoxicity and signal pathway activities. All derivatives showed potential antiviral activity towards influenza virus or herpes simplex virus (HSV), 7 g with the substitution of nitro group showed strong effects towards H1N1 virus at 30 µM with inhibitory rate of 66.0%, 7o with thiophene exhibited potent anti HSV-1 activities with inhibitory rate of 65.8%. Moreover, several compounds exhibited inhibitory effects on tumor cells and hypoxia-inducible factor-1 (HIF1) signaling pathways. These results showed that α-nitrile substituted guaiazulene-based chalcones offered a promising framework for the further development of new highly efficient drugs.


Assuntos
Antivirais , Azulenos , Chalconas , Azulenos/farmacologia , Azulenos/química , Azulenos/síntese química , Humanos , Estrutura Molecular , Antivirais/farmacologia , Antivirais/síntese química , Chalconas/farmacologia , Chalconas/síntese química , Linhagem Celular Tumoral , Sesquiterpenos de Guaiano/farmacologia , Sesquiterpenos de Guaiano/síntese química , Vírus da Influenza A Subtipo H1N1/efeitos dos fármacos , Chalcona/farmacologia , Chalcona/química , Chalcona/análogos & derivados , Chalcona/síntese química , Antineoplásicos/farmacologia , Antineoplásicos/síntese química , Antineoplásicos/química , Herpesvirus Humano 1/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Desenho de Fármacos , Animais
9.
Front Microbiol ; 15: 1450226, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-39144231

RESUMO

Indigenous microbial enhanced oil recovery (IMEOR) is a promising alternative way to promote oil recovery. It activates oil recovery microorganisms in the reservoir by adding nutrients to the injected water, utilizing microbial growth and metabolism to enhance recovery. However, few studies have focused on the impact of injected nutrients on reservoir microbial community composition and potential functions. This limits the further strategic development of IMEOR. In this study, we investigated the effects of nutrition on the composition of the reservoir bacterial community and functions in the Qizhong block of Xinjiang Oilfield, China, by constructing a long core microbial flooding simulation device. The results showed that the microbial community structure of the reservoir changed from aerobic state to anaerobic state after nutrient injection. Reducing the nutrient concentration increased the diversity and network stability of the reservoir bacterial community. At the same time, the nitrogen metabolism function also showed the same change response. Overall, these results indicated that nutrition significantly affected the community structure and function of reservoir microorganisms. Injecting low concentrations of nutrients may be more beneficial to improve oil recovery. This study is of great significance for guiding IMEOR technology and saving costs at the field site.

10.
BMC Neurosci ; 25(1): 40, 2024 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-39192193

RESUMO

BACKGROUND: Using event-related potentials (ERPs), we aimed to investigate audiovisual integration neural mechanisms during a letter identification task in the left and right sides. Unimodal (A,V) and bimodal (AV) stimuli were presented on either side, with ERPs from unimodal (A,V) stimuli on the same side being compared to those from simultaneous bimodal stimuli (AV). Non-zero results of the AV-(A + V) difference waveforms indicated audiovisual integration on the left/right side. RESULTS: When spatially coherent AV stimuli were presented on the right side, two significant ERP components in the integrated differential wave were noted. The N134 and N262, present in the first 300 ms of the AV-(A + V) integration difference wave, indicated significant audiovisual integration effects. However, when these stimuli were presented on the left side, there were no significant integration components. This audiovisual integration difference may stem from left/right asymmetry of cerebral hemisphere language processing. CONCLUSIONS: Audiovisual letter information presented on the right side was easier to integrate, process, and represent. Additionally, only one significant integrative component peaked at 140 ms in the parietal cortex for spatially non-coherent AV stimuli and provided audiovisual multisensory integration, which could be attributed to some integrative neural processes that depend on the spatial congruity of the auditory and visual stimuli.


Assuntos
Estimulação Acústica , Percepção Auditiva , Eletroencefalografia , Potenciais Evocados , Lateralidade Funcional , Estimulação Luminosa , Percepção Visual , Humanos , Masculino , Feminino , Adulto Jovem , Percepção Auditiva/fisiologia , Lateralidade Funcional/fisiologia , Percepção Visual/fisiologia , Estimulação Luminosa/métodos , Adulto , Estimulação Acústica/métodos , Potenciais Evocados/fisiologia , Encéfalo/fisiologia , Tempo de Reação/fisiologia
11.
Bioresour Technol ; 409: 131244, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39127363

RESUMO

Hydrocarbon-degrading consortia (HDC) play an important role in petroleum exploitation. However, the real composition and metabolic mechanism of HDC in the microbial enhanced oil recovery (MEOR) process remain unclear. By combining 13C-DNA stable isotope probing microcosms with metagenomics, some newly reported phyla, including Chloroflexi, Synergistetes, Thermotogae, and Planctomycetes, dominated the HDC in the oil reservoirs. In the field trials, the HDC in the aerobic-facultative-anaerobic stage of oilfields jointly promoted the MEOR process, with monthly oil increments of up to 189 tons. Pseudomonas can improve oil recovery by producing rhamnolipid in the facultative condition. Roseovarius was the novel taxa potentially oxidizing alkane and producing acetate to improve oil porosity and permeability in the aerobic condition. Ca. Bacteroidia were the new members potentially degrading hydrocarbons by fumarate addition in the anaerobic environment. Comprehensive identification of the active HDC in oil reservoirs provides a novel theoretical basis for oilfield regulatory scheme.


Assuntos
Biodegradação Ambiental , Hidrocarbonetos , Campos de Petróleo e Gás , Hidrocarbonetos/metabolismo , Campos de Petróleo e Gás/microbiologia , Consórcios Microbianos/fisiologia , Bactérias/metabolismo , Petróleo/metabolismo , Filogenia
12.
Int J Biol Macromol ; 277(Pt 4): 134419, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39097060

RESUMO

In this study, a carboxymethylated Anemarrhena asphodeloides polysaccharide (CM-AARP) with an molecular weight (Mw) of 7.8 × 104 Da was obtained. CM-AARP was composed of four monosaccharides including d-mannose, d-glucose, d-galactose, and l-arabinose. Nuclear magnetic resonance (NMR) spectra revealed that the skeleton of CM-AARP was identical to that of AARP. Compared with AARP, CM-AARP had a superior inhibition effect on the gelatinization of wheat starch (WS) under the same condition. The addition of CM-AARP and AARP at 12 % enhanced the gelatinization temperature (60.47 ± 1.30 °C) of WS to 73.88 ± 0.49 °C and 69.75 ± 0.52 °C, respectively. CM-AARP could maintain the crystal structure of WS during gelatinization, the relative crystallinity with the 12 % CM-AARP addition was determined as 29.18 % ± 1.49 %, exceeding that of pure WS at 21.96 % ± 0.66 %. Moreover, CM-AARP influenced the rheological behavior of the gelatinized WS by reducing the viscosity and improving the fluidity. The results suggested that CM-AARP played an essential role in starch gelatinization and was a potential stabilizer in the starch-based food industry.


Assuntos
Peso Molecular , Polissacarídeos , Reologia , Amido , Triticum , Amido/química , Amido/análogos & derivados , Triticum/química , Polissacarídeos/química , Polissacarídeos/farmacologia , Viscosidade , Temperatura , Monossacarídeos/química , Monossacarídeos/análise , Gelatina/química , Metilação
13.
Small ; 20(43): e2404979, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39177180

RESUMO

Superhydrophobic surfaces have attracted significant attention for their ability to prevent ice formation and facilitate deicing without requiring external energy. However, these surfaces are often vulnerable to damage from external forces, leading to functional failure due to poor mechanical stability, which limits their widespread use. Drawing inspiration from the hierarchical groove of rose petals and the micropapillae of lotus leaves, a simple laser-based method is proposed to create a superhydrophobic surface with a micro/nano hierarchical crater-like structure (HCLS). To enhance the surface, boiling water treatment is applied to induce dense nanostructures, resulting in an optimal contact angle (CA) of 162° and a desirable sliding angle (SA) of 2.0°. The initial ice adhesion strength of HCLS is as low as 1.4 kPa and remains below 10 kPa even after 300 cm sandpaper abrasion. Furthermore, the HCLS demonstrates excellent mechanical durability, maintaining its performance under conditions that simulate the continuous impact of water and sand in extreme weather. This approach offers an innovative design concept that has the potential to advance the development of anti-icing and deicing surfaces for future aircraft.

14.
Langmuir ; 40(26): 13648-13656, 2024 Jul 02.
Artigo em Inglês | MEDLINE | ID: mdl-38952282

RESUMO

Controlling the spontaneous directional transport of droplets plays an important role in the application of microchemical reactions and microdroplet detection. Although the relevant technologies have been widely studied, the existing spontaneous droplet transport strategies still face problems of complex structure, single function, and poor flexibility. Inspired by the spontaneous droplet transport strategy in nature, an asymmetric wettability surface with microcone channels (AWS-MC) is prepared on a flexible fabric by combining surface modification and femtosecond laser manufacturing technology. On this surface, the capillary force and Laplace pressure induced by the wettability gradient and the geometric structure gradient drive the droplet transport from the hydrophobic surface to the hydrophilic surface. Notably, droplets in adjacent hydrophilic regions do not exchange substances even if the gap in the hydrophilic region is only 1 mm, which provides an ideal platform for numerous detections by a single drop. The droplet transport strategy does not require external energy and can adapt to the manipulation of various droplet types. Application of this surface in the blood of organisms is demonstrated. This work provides an effective method for microdroplet-directed self-transport and microdroplet detection.


Assuntos
Molhabilidade , Interações Hidrofóbicas e Hidrofílicas , Técnicas Analíticas Microfluídicas/instrumentação , Técnicas Analíticas Microfluídicas/métodos , Animais , Propriedades de Superfície
15.
Nanomaterials (Basel) ; 14(13)2024 Jul 07.
Artigo em Inglês | MEDLINE | ID: mdl-38998765

RESUMO

Dynamic optical structural color is always desired in various display applications and usually involves active materials. Full-color generation, especially bi-directional full-color generation in both reflective and transmissive modes, without any active materials included, has rarely been investigated. Herein, we demonstrate a scheme of bi-directional full-color generation based on a plasmonic metasurface modulated by the rotation of the polarization angle of the incident light without varying the geometry and the optical properties of the materials and the environment where the metasurface resides. The metasurface unit cell consists of plasmonic modules aligning in three directions and is patterned in a square array. The metasurface structural color device is numerically confirmed to generate full colors in both reflection and transmission. Based on the proposed polarization-dependent structural color, the information encoding process is demonstrated for three multiplexed animal images and quick-responsive (QR) codes to verify the efficient information encoding and decoding of the proposed scheme. In the simulation, the animals can be seen under different polarization incidences, and the QR codes can be successfully decoded by the polarization rotation in transmission. The proposed bi-directional full-color generation metasurface has great potential in applications such as kaleidoscope generation, anti-counterfeiting, dynamic color display, and optical information encoding.

16.
BMC Pregnancy Childbirth ; 24(1): 456, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38951757

RESUMO

BACKGROUND: TBX6, a member of the T-box gene family, encodes the transcription factor box 6 that is critical for somite segmentation in vertebrates. It is known that the compound heterozygosity of disruptive variants in trans with a common hypomorphic risk haplotype (T-C-A) in the TBX6 gene contribute to 10% of congenital scoliosis (CS) cases. The deletion of chromosome 17q12 is a rare cytogenetic abnormality, which often leads to renal cysts and diabetes mellitus. However, the affected individuals often exhibit clinical heterogeneity and incomplete penetrance. METHODS: We here present a Chinese fetus who was shown to have CS by ultrasound examination at 17 weeks of gestation. Trio whole-exome sequencing (WES) was performed to investigate the underlying genetic defects of the fetus. In vitro functional experiments, including western-blotting and luciferase transactivation assay, were performed to determine the pathogenicity of the novel variant of TBX6. RESULTS: WES revealed the fetus harbored a compound heterozygous variant of c.338_340del (p.Ile113del) and the common hypomorphic risk haplotype of the TBX6 gene. In vitro functional study showed the p.Ile113del variant had no impact on TBX6 expression, but almost led to complete loss of its transcriptional activity. In addition, we identified a 1.85 Mb deletion on 17q12 region in the fetus and the mother. Though there is currently no clinical phenotype associated with this copy number variation in the fetus, it can explain multiple renal cysts in the pregnant woman. CONCLUSIONS: This study is the first to report a Chinese fetus with a single amino acid deletion variant and a T-C-A haplotype of TBX6. The clinical heterogeneity of 17q12 microdeletion poses significant challenges for prenatal genetic counseling. Our results once again suggest the complexity of prenatal genetic diagnosis.


Assuntos
Cromossomos Humanos Par 17 , Haplótipos , Heterozigoto , Proteínas com Domínio T , Humanos , Proteínas com Domínio T/genética , Feminino , Cromossomos Humanos Par 17/genética , Gravidez , Adulto , Deleção Cromossômica , Sequenciamento do Exoma , Deleção de Sequência , Feto/anormalidades , Ultrassonografia Pré-Natal
17.
Biomedicines ; 12(7)2024 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-39062110

RESUMO

Diverse clinical observations and basic studies have been conducted to explore the implications of analgesic medications in liver diseases. However, the direct causal relationship between prescription analgesic use (PAU) and the risk of liver cancer and precancerosis remains unclear. Thus, we aimed to reveal the conceivable causal effect of PAU on liver cancer and precancerosis, with immune cells as mediating factors. Two-sample Mendelian randomization (MR) analyses were performed to ascertain the causality of PAU on liver cancer and precancerosis. Sensitivity analysis approaches were employed to assess the heterogeneity and pleiotropy of results. Our findings revealed a causal correlation between different PAUs and the risk of liver cancer and alcoholic liver disease (ALD). Specifically, salicylic acid derivatives (SADs) and anilide medications were found to have a protective effect on liver cancer. And non-steroidal anti-inflammatory drugs (NSAIDs) and anilide medications showed a causal impact on ALD. Finally, mediation analyses found that anilide medications influence liver cancer through different immune cell phenotypes. Our research provides new genetic evidence for the causal impact of PAU on liver cancer and precancerosis, with the mediating role of immune cells demonstrated, offering a valuable foundation for researching analgesic medications in liver cancer and precancerosis treatment.

18.
Phytochemistry ; 226: 114220, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-38997099

RESUMO

Fourteen undescribed nitrogenous merosesquiterpenoids, purpurols A-D (1-4) and puraminones A-J (5-14), along with three known related compounds (15-17) were isolated from the sponge Pseudoceratina purpurea collected in the South China Sea. Their structures and absolute configurations were unambiguously elucidated by a combination of spectroscopic data, X-ray diffraction analysis, electronic circular dichroism calculations, and chemical derivatization. Purpurols A-D (1-4) incorporated nitrogenous heterocycles, compounds 1 and 2 feature an unusual benzothiazole ring, while 3 and 4 feature benzoxazole ring. Puraminones A-J (5-14) represent sesquiterpenoid aminoquinones with different amine and amino acid side chains at C-20. Additionally, twenty unreported sesquiterpenoid aminoquinone analogues were obtained through chemical derivatization. It is worth noting that all compounds are featured with unusual rearranged 4,9-friedodrimane subunit. In the bioassays, purpurols A and B showed weak anti-inflammation in zebrafish, as well as some compounds showed activities against tumor cells, therefore, preliminary structure-cytotoxicity relationships are also discussed.


Assuntos
Poríferos , Sesquiterpenos , Peixe-Zebra , Animais , Poríferos/química , Sesquiterpenos/química , Sesquiterpenos/farmacologia , Sesquiterpenos/isolamento & purificação , Humanos , Estrutura Molecular , Antineoplásicos/farmacologia , Antineoplásicos/química , Antineoplásicos/isolamento & purificação , Ensaios de Seleção de Medicamentos Antitumorais , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/química , Anti-Inflamatórios/isolamento & purificação , Relação Estrutura-Atividade
19.
J Hazard Mater ; 477: 135267, 2024 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-39047552

RESUMO

Developing multifunctional materials for water treatment remains a significant challenge. Bacterial cellulose (BC) holds immense potential as an adsorbent with high pollutant-binding capacity, hydrophilicity, and biosafety. In this study, N-acetylglucosamine was used as a carbon source to ferment BC, incorporating amide bonds in situ. Bentonite, renowned for its adsorption properties, was added to the culture medium, resulting in BC-bentonite composite membranes via a one-step fermentation process. Polyethyleneimine (PEI) was crosslinked with amide bonds on the membrane via glutaraldehyde through Schiff base reactions to enhance the performance of the composite membrane. The obtained membrane exhibited increased hydrophilicity, enhanced active adsorption sites, and enlarged specific surface area. It not only physically adsorbed contaminants through its unique structure but also effectively captured dye molecules (Congo red, Methylene blue, Malachite green) via electrostatic interactions. Additionally, it formed stable complexes with metal ions (Cd²âº, Pb²âº, Cu²âº) through coordination and effectively adsorbed their mixtures. Moreover, the composite membrane demonstrated the broad-spectrum antibacterial activity, effectively inhibiting the growth of tested bacteria. This study introduces an innovative method for fabricating composite membranes as adsorbents for complex water pollutants, showing significant potential for long-term wastewater treatment of organic dyes, heavy metal ions, and pathogens.


Assuntos
Antibacterianos , Bentonita , Celulose , Corantes , Membranas Artificiais , Polietilenoimina , Poluentes Químicos da Água , Purificação da Água , Adsorção , Celulose/química , Bentonita/química , Corantes/química , Polietilenoimina/química , Purificação da Água/métodos , Antibacterianos/química , Antibacterianos/farmacologia , Poluentes Químicos da Água/química , Metais Pesados/química
20.
Int J Biol Macromol ; 277(Pt 2): 134304, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39084443

RESUMO

Tea plant (Camellia sinensis) is an important economical crop that frequently suffers from various herbicides, especially glyphosate. However, the molecular responses and regulatory mechanisms of glyphosate stress in tea plants remain poorly understood. Here, we reported a transcriptome dataset and identified large number of differentially expressed genes (DEGs) under glyphosate exposure. Next, two glutathione S-transferase genes (CsGSTU8-1 and CsGSTU8-2) that upregulated significantly were screened as candidate genes. Tissue-specific expression patterns showed that both CsGSTU8-1 and CsGSTU8-2 had extremely high expression levels in the roots and were predominantly localized in the nucleus and plasma membrane based on subcellular localization. Both were significantly upregulated at different time points under various stressors, including drought, cold, salt, pathogen infections, and SA treatments. An enzymatic activity assay showed that CsGSTU8-1 catalyzes the conjugation of glutathione with 2,4-dinitrochlorobenzene (CDNB). Functional analysis in yeast verified that the two genes significantly contributed to the detoxification of glyphosate, and CsGSTU8-1 had a stronger role in detoxification than CsGSTU8-2. Taken together, these findings provide insights into the molecular responses of tea plants to glyphosate and the functions of CsGSTU8s in glyphosate detoxification, which can be used as a promising genetic resource for improving herbicide resistance in tea cultivars.


Assuntos
Camellia sinensis , Regulação da Expressão Gênica de Plantas , Glutationa Transferase , Glicina , Glifosato , Glicina/análogos & derivados , Glicina/metabolismo , Glicina/toxicidade , Camellia sinensis/genética , Camellia sinensis/efeitos dos fármacos , Camellia sinensis/metabolismo , Camellia sinensis/enzimologia , Glutationa Transferase/metabolismo , Glutationa Transferase/genética , Regulação da Expressão Gênica de Plantas/efeitos dos fármacos , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Estresse Fisiológico/efeitos dos fármacos , Estresse Fisiológico/genética , Inativação Metabólica/genética , Transcriptoma , Herbicidas/farmacologia , Herbicidas/metabolismo , Perfilação da Expressão Gênica
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