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1.
Nano Lett ; 18(12): 7448-7456, 2018 12 12.
Artigo em Inglês | MEDLINE | ID: mdl-30403141

RESUMO

Investigating the multidimensional integration between different microbiological kingdoms possesses potential toward engineering next-generation bionic architectures. Bacterial and fungal kingdom exhibits mutual symbiosis that can offer advanced functionalities to these bionic architectures. Moreover, functional nanomaterials can serve as probing agents for accessing newer information from microbial organisms due to their dimensional similarities. In this article, a bionic mushroom was created by intertwining cyanobacterial cells with graphene nanoribbons (GNRs) onto the umbrella-shaped pileus of mushroom for photosynthetic bioelectricity generation. These seamlessly merged GNRs function as agents for mediating extracellular electron transport from cyanobacteria resulting in photocurrent generation. Additionally, three-dimensional (3D) printing technique was used to assemble cyanobacterial cells in anisotropic, densely packed geometry resulting in adequate cell-population density for efficient collective behavior. These 3D printed cyanobacterial colonies resulted in comparatively higher photocurrent (almost 8-fold increase) than isotropically casted cyanobacteria of similar seeding density. An insight of the proposed integration between cyanobacteria and mushroom derives remarkable advantage that arises from symbiotic relationship, termed here as engineered bionic symbiosis. Existence of this engineered bionic symbiosis was confirmed by UV-visible spectroscopy and standard plate counting method. Taken together, the present study augments scientific understanding of multidimensional integration between the living biological microworld and functional abiotic nanomaterials to establish newer dimensionalities toward advancement of bacterial nanobionics.


Assuntos
Fontes de Energia Bioelétrica/microbiologia , Cianobactérias/citologia , Nanoestruturas/química , Nanotecnologia/métodos , Impressão Tridimensional , Biônica/métodos , Células Imobilizadas/citologia , Células Imobilizadas/metabolismo , Cianobactérias/metabolismo , Transporte de Elétrons , Fotossíntese
2.
Nano Lett ; 13(6): 2634-9, 2013 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-23635097

RESUMO

The ability to three-dimensionally interweave biological tissue with functional electronics could enable the creation of bionic organs possessing enhanced functionalities over their human counterparts. Conventional electronic devices are inherently two-dimensional, preventing seamless multidimensional integration with synthetic biology, as the processes and materials are very different. Here, we present a novel strategy for overcoming these difficulties via additive manufacturing of biological cells with structural and nanoparticle derived electronic elements. As a proof of concept, we generated a bionic ear via 3D printing of a cell-seeded hydrogel matrix in the anatomic geometry of a human ear, along with an intertwined conducting polymer consisting of infused silver nanoparticles. This allowed for in vitro culturing of cartilage tissue around an inductive coil antenna in the ear, which subsequently enables readout of inductively-coupled signals from cochlea-shaped electrodes. The printed ear exhibits enhanced auditory sensing for radio frequency reception, and complementary left and right ears can listen to stereo audio music. Overall, our approach suggests a means to intricately merge biologic and nanoelectronic functionalities via 3D printing.


Assuntos
Biônica , Orelha , Engenharia Tecidual , Humanos , Nanopartículas
3.
Nat Commun ; 3: 763, 2012 Mar 27.
Artigo em Inglês | MEDLINE | ID: mdl-22453836

RESUMO

Direct interfacing of nanosensors onto biomaterials could impact health quality monitoring and adaptive threat detection. Graphene is capable of highly sensitive analyte detection due to its nanoscale nature. Here we show that graphene can be printed onto water-soluble silk. This in turn permits intimate biotransfer of graphene nanosensors onto biomaterials, including tooth enamel. The result is a fully biointerfaced sensing platform, which can be tuned to detect target analytes. For example, via self-assembly of antimicrobial peptides onto graphene, we show bioselective detection of bacteria at single-cell levels. Incorporation of a resonant coil eliminates the need for onboard power and external connections. Combining these elements yields two-tiered interfacing of peptide-graphene nanosensors with biomaterials. In particular, we demonstrate integration onto a tooth for remote monitoring of respiration and bacteria detection in saliva. Overall, this strategy of interfacing graphene nanosensors with biomaterials represents a versatile approach for ubiquitous detection of biochemical targets.


Assuntos
Técnicas Biossensoriais , Esmalte Dentário/microbiologia , Grafite/farmacologia , Nanotecnologia/métodos , Dente/microbiologia , Peptídeos Catiônicos Antimicrobianos/farmacologia , Materiais Biocompatíveis , Escherichia coli/isolamento & purificação , Helicobacter pylori/isolamento & purificação , Humanos , Nanoestruturas , Saliva/microbiologia , Staphylococcus aureus/isolamento & purificação
4.
Adv Mater ; 24(8): 1067-72, 2012 Feb 21.
Artigo em Inglês | MEDLINE | ID: mdl-22266768

RESUMO

An array of passive metamaterial antennas fabricated on all protein-based silk substrates were conformally transferred and adhered to the surface of an apple. This process allows the opportunity for intimate contact of micro- and nanostructures that can probe, and accordingly monitor changes in, their surrounding environment. This provides in situ monitoring of food quality. It is to be noted that this type of sensor consists of all edible and biodegradable components, holding utility and potential relevance for healthcare and food/consumer products and markets.


Assuntos
Adesivos/química , Técnicas Biossensoriais/instrumentação , Ingestão de Alimentos , Análise de Alimentos/instrumentação , Seda/química , Fenômenos Eletromagnéticos , Inocuidade dos Alimentos , Humanos , Tecnologia sem Fio
5.
Proc Natl Acad Sci U S A ; 107(45): 19207-12, 2010 Nov 09.
Artigo em Inglês | MEDLINE | ID: mdl-20956332

RESUMO

The development of a robust and portable biosensor for the detection of pathogenic bacteria could impact areas ranging from water-quality monitoring to testing of pharmaceutical products for bacterial contamination. Of particular interest are detectors that combine the natural specificity of biological recognition with sensitive, label-free sensors providing electronic readout. Evolution has tailored antimicrobial peptides to exhibit broad-spectrum activity against pathogenic bacteria, while retaining a high degree of robustness. Here, we report selective and sensitive detection of infectious agents via electronic detection based on antimicrobial peptide-functionalized microcapacitive electrode arrays. The semiselective antimicrobial peptide magainin I--which occurs naturally on the skin of African clawed frogs--was immobilized on gold microelectrodes via a C-terminal cysteine residue. Significantly, exposing the sensor to various concentrations of pathogenic Escherichia coli revealed detection limits of approximately 1 bacterium/µL, a clinically useful detection range. The peptide-microcapacitive hybrid device was further able to demonstrate both Gram-selective detection as well as interbacterial strain differentiation, while maintaining recognition capabilities toward pathogenic strains of E. coli and Salmonella. Finally, we report a simulated "water-sampling" chip, consisting of a microfluidic flow cell integrated onto the hybrid sensor, which demonstrates real-time on-chip monitoring of the interaction of E. coli cells with the antimicrobial peptides. The combination of robust, evolutionarily tailored peptides with electronic read-out monitoring electrodes may open exciting avenues in both fundamental studies of the interactions of bacteria with antimicrobial peptides, as well as the practical use of these devices as portable pathogen detectors.


Assuntos
Peptídeos Catiônicos Antimicrobianos , Bactérias/isolamento & purificação , Técnicas Biossensoriais/métodos , Animais , Escherichia coli/isolamento & purificação , Proteínas Imobilizadas , Limite de Detecção , Microeletrodos , Salmonella/isolamento & purificação , Xenopus , Proteínas de Xenopus
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