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https://www.readbyqxmd.com/read/29150665/a-streamlined-cloning-workflow-minimising-the-time-to-strain-pipeline-for-pichia-pastoris
#1
Kate E Royle, Karen Polizzi
Although recent advances in E. coli self-assembly have greatly simplified cloning, these have not yet been harnessed for the high-throughput generation of expression strains in the early research and discovery phases of biopharmaceutical production. Here, we have refined the technique and incorporated it into a streamlined workflow for the generation of Pichia pastoris expression strains, reducing the timeline by a third and removing the reliance on DNA editing enzymes, which often require troubleshooting and increase costs...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29150488/membrane-binding-of-and-a-self-inhibitory-interaction-within-nup155-are-required-for-nuclear-pore-complex-formation
#2
Paola De Magistris, Marianna Tatarek-Nossol, Manfred Dewor, Wolfram Antonin
Nuclear pore complexes (NPCs) are the gateways through the nuclear envelope. How they form into a structure containing three rings and integrate into the nuclear envelope remains a challenging paradigm for coordinated assembly of macro-complexes. In vertebrates, the cytoplasmic and nucleoplasmic rings of NPCs are mostly formed by multiple copies of the Nup107-Nup160 complex, whereas the central, or inner ring is composed of Nup53, Nup93, Nup155 and the two paralogues Nup188 and Nup205. Inner ring assembly is only partially understood...
November 17, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/29150015/the-flotation-and-adsorption-of-mixed-collectors-on-oxide-and-silicate-minerals
#3
REVIEW
Longhua Xu, Jia Tian, Houqin Wu, Zhongyuan Lu, Wei Sun, Yuehua Hu
The analysis of flotation and adsorption of mixed collectors on oxide and silicate minerals is of great importance for both industrial applications and theoretical research. Over the past years, significant progress has been achieved in understanding the adsorption of single collectors in micelles as well as at interfaces. By contrast, the self-assembly of mixed collectors at liquid/air and solid/liquid interfaces remains a developing area as a result of the complexity of the mixed systems involved and the limited availability of suitable analytical techniques...
November 11, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/29149989/low-background-and-visual-detection-of-antibiotic-based-on-target-activated-colorimetric-split-peroxidase-dnazyme-coupled-with-dual-nicking-enzyme-signal-amplification
#4
REVIEW
Xuejun Cui, Rongguo Li, Xiaofei Liu, Jingfeng Wang, Xueqi Leng, Xiaolei Song, Qianqian Pei, Yu Wang, Su Liu, Jiadong Huang
Herein, we have reported the development of a simple, rapid, and low cost colorimetric method for the detection of antibiotic based on target-activated split peroxidase DNAzyme coupled with dual nicking enzyme signal amplification (NESA). To lower background signal in G-quadruplex DNAzyme-based detection, the two split G-rich parts are caged into two different hairpin probes, respectively, preventing the two parts from assembling into the G-quadruplex structure. By the combination of restriction endonuclease-assisted cleavage reaction with the spilt G-quadruplex probes, target-modulated release of the two split G-rich parts is achieved, affording high specificity of antibiotic detection...
January 2, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29149720/a-robust-strategy-for-preparation-of-sequential-stimuli-responsive-block-copolymer-prodrugs-via-thiolactone-chemistry-to-overcome-multiple-anticancer-drug-delivery-barriers
#5
Wendong Ke, Wei Yin, Zengshi Zha, Jean Felix Mukerabigwi, Weijian Chen, Yuheng Wang, Chuanxin He, Zhishen Ge
Block copolymer prodrugs (BCPs) have attracted considerable attentions in clinical translation of nanomedicine owing to their self-assembly into well-defined core-shell nanoparticles for improved pharmacokinetics, stability in blood circulation without drug leakage, and optimized biodistribution. However, a cascade of physiological barriers against specific delivery of drugs into tumor cells limit the final therapeutic efficacy. Herein, we report a robust and facile strategy based on thiolactone chemistry to fabricate well-defined BCPs with sequential tumor pH-promoted cellular internalization and intracellular stimuli-responsive drug release...
November 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/29149465/controlled-sol-gel-transitions-of-a-thermoresponsive-polymer-in-a-photoswitchable-azobenzene-ionic-liquid-as-a-molecular-machine
#6
Masayoshi Watanabe, Caihong Wang, Kei Hashimoto, Ryota Tamate, Hisashi Kokubo
Producing ionic liquids (ILs) that function as molecular machines for macroscopic change is a challenging issue. We report that photoisomerization of an azobenzene IL at the molecular level could evoke a macroscopic response (light-controlled mechanical sol-gel transitions) for ABA triblock copolymer solutions. The A endblocks, poly(2-phenylethyl methacrylate), show a low critical solution temperature in the IL mixture containing azobenzene while the B midblock, poly(methyl methacrylate), is compatible with the mixture...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29148846/preparation-and-evaluation-of-curcumin-loaded-self-assembled-micelles
#7
Lu-Lu Wang, Dan-Dan He, Shu-Xia Wang, Yun-Hao Dai, Jian-Ming Ju, Cheng-Lei Zhao
Objective Curcumin being used to treat various chronic diseases while its poor bioavailability issue limited its wide clinical application as a therapeutic agent. The aim of this work was to prepare curcumin-loaded self-assembled micelles using soluplus and solutol®HS15 (SSCMs) to enhance curcumin's solubility and thus oral bioavailability. Methods Optimum formulation was investigated and the optimized ratio of drugs and excipients was obtained and the SSCMs were prepared via ethanol solvent evaporation method...
November 17, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29148805/near-infrared-quantum-dot-emission-enhanced-by-stabilized-self-assembled-j-aggregate-antennas
#8
Francesca S Freyria, José M Cordero, Justin R Caram, Sandra Doria, Amro Dodin, Yue Chen, Adam P Willard, Moungi G Bawendi
Enhancing photoluminescent emission (PL) in the near-infrared-infrared (NIR-IR) spectral region has broad applications from solar energy conversion to biological imaging. We show that self-assembled molecular dye J-aggregates (light-harvesting nanotubes, LHNs) can increase the PL emission of NIR PbS quantum dots (QDs) in both liquid and solid media more than 8-fold, promoted primarily by a long-range antenna effect and efficient Förster resonance energy transfer (FRET) from donor to acceptor. To create this composite material and preserve the optical properties of the nanocrystals, we performed an in situ ligand substitution followed by a functionalization reaction using click-chemistry...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148799/uniaxial-2d-superlattice-of-fe4-molecular-magnets-on-graphene
#9
Luca Gragnaniello, Fabian Paschke, Philipp Erler, Peter Schmitt, Nicole Barth, Sabina Simon, Harald Brune, Stefano Rusponi, Mikhail Fonin
We demonstrate that electrospray deposition enables the fabrication of highly periodic self-assembled arrays of Fe4H single molecule magnets on graphene/Ir(111). The energetic positions of molecular states are probed by means of scanning tunneling spectroscopy, showing pronounced long- and short-ranged spatial modulations, indicating the presence of both locally varying intermolecular as well as adsorption-site dependent molecule-substrate interactions. From the magnetic field dependence of the X-ray magnetic circular dichroism signal, we infer that the magnetic easy axis of each Fe4H molecule is oriented perpendicular to the sample surface and that after the deposition the value of the uniaxial anisotropy is identical to the one in bulk...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148798/addition-to-molecular-origin-and-self-assembly-of-fluorescent-carbon-nanodots-in-polar-solvents
#10
Arjun Sharma, Trilochan Gadly, Suman Neogy, Sunil Kumar Ghosh, Manoj Kumbhakar
No abstract text is available yet for this article.
November 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29148796/layer-by-layer-self-assembly-of-polyelectrolytic-block-copolymer-worms-on-a-planar-substrate
#11
Nicholas Penfold, Andrew J Parnell, Marta Molina, Pierre Verstraete, Johan Smets, Steven P Armes
Cationic and anionic block copolymer worms are prepared by polymerization-induced self-assembly (PISA) via reversible addition-fragmentation chain transfer (RAFT) aqueous dispersion copolymerization of 2-hydroxypropyl methacrylate (HPMA) and glycidyl methacrylate (GlyMA), using a binary mixture of a non-ionic poly(ethylene oxide) (PEO) macromolecular RAFT agent and either a cationic poly([2-(methacryloyloxy)ethyl] trimethylammonium chloride) (PQDMA) or an anionic poly(potassium 3-sulfopropyl methacrylate) (PKSPMA) macromolecular RAFT agent...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148790/solid-state-dewetting-of-gold-aggregates-islands-on-tio2-nanorod-structures-grown-by-oblique-angle-deposition
#12
Shizhao Liu, Joel Plawsky
A composite film made of a stable, gold nanoparticle (NP) array with well-controlled separation and size atop a TiO2 nanorod film was fabricated via the oblique angle deposition technique (OAD). The fabrication of the nanoparticle array is based on controlled, Rayleigh-instability-induced, solid-state dewetting of as-deposited gold aggregates on the TiO2 nanorods. It was found that the initial spacing between as-deposited gold aggregates along the vapor flux direction should be greater than the TiO2 inter-rod spacing created by 80° OAD in order to control the dewetting and produce NP arrays...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148789/amphiphilic-n-heterocyclic-carbene-stabilized-gold-nanoparticles-and-their-self-assembly-in-polar-solvents
#13
Mina R Narouz, Chien-Hung Li, Ali Nazemi, Cathleen M Crudden
Soft matter-directed self-assembly of amphiphilic inorganic nanoparticles (NPs) has recently emerged as a promising approach to access NP ensembles with superior collective properties. While thiol-terminated molecules are primarily employed to tether the amphiphilic ligand to the metal, serious concerns remain regarding the stabilities of the resulting NPs and their corresponding superstructures. As an alternative to such ligands, we report the first example of amphiphilic N-heterocyclic carbene (NHC)-functionalized gold nanoparticles (AuNPs)...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148741/controlling-association-and-separation-of-gold-nanoparticles-with-computationally-designed-zinc-coordinating-proteins
#14
Matthew J Eibling, Christopher M MacDermaid, Zhaoxia Qian, Christopher J Lanci, So-Jung Park, Jeffery G Saven
Functionalization of nanoparticles with biopolymers has yielded a wide range of structured and responsive hybrid materials. DNA provides the ability to program length and recognition using complementary oligonucleotide sequences. Nature more often leverages the versatility of proteins, however, where structure, assembly, and recognition are more subtle to engineer. Herein, a protein was computationally designed to present multiple Zn(2+) coordination sites and cooperatively self-associate to form an antiparallel helical homodimer...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148735/stereoselective-stabilization-of-polymeric-vitamin-e-conjugate-micelles
#15
Min Gao, Jian Deng, Huiying Chu, Yu Tang, Zheng Wang, Yanjun Zhao, Guohui Li
Vitamin E (α-tocopherol) (TPGS) micelle is a robust nanocarrier in delivering hydrophobic active pharmaceutical ingredients, but is suffering from poor stability that is essential in terms of pharmaceutical and biomedical applications. Taking advantage of the chirality of vitamin E, this work reports the stereoselective stabilization of polymer-vitamin E conjugate micelles. Vitamin E was covalently linked to multivalent methoxy poly(ethylene glycol)-co-poly(glutamic acid), generating amphiphilic conjugates that could self-assemble into micelles...
November 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29148708/magnetron-sputtering-deposition-cu-onion-like-n-c-as-high-performance-electrocatalysts-for-oxygen-reduction-reaction
#16
Hongyang Shao, Xiaoming Zhang, Hao Huang, Kan Zhang, Menglong Wang, Cai Zhang, Yifan Yang, Mao Wen, Weitao Zheng
The idea of a core-shell structure can promote the utilization of nonprecious metallic catalysts by enhancing their activity and stability for the oxygen reduction reaction (ORR). Developing a low-cost, high-efficiency, and high-reproducibility method for synthesizing core-shell-structured materials represents an urgent challenge. Here, we fabricate encapsulated Cu nanoparticles with nitrogen-doped onion-like graphite nanoshells (Cu@onion-like N-C) as an efficient ORR catalyst by magnetron sputtering, in which the graphite shells grow by an in situ self-assembly process activated by the surface-catalyzed behavior with Cu nanoparticles...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148619/molten-salt-assisted-self-assembly-synthesis-of-mesoporous-licoo2-and-limn2-o4-thin-films-and-investigation-of-electrocatalytic-water-oxidation-performance-of-lithium-cobaltate
#17
Gülbahar Saat, Fadime Mert Balci, Elif Pınar Alsaç, Ferdi Karadas, Ömer Dag
Mesoporous thin films of transition metal lithiates (TML) belong to an important group of materials for the advancement of electrochemical systems. This study demonstrates a simple one pot method to synthesize the first examples of mesoporous LiCoO2 and LiMn2 O4 thin films. Molten salt assisted self-assembly can be used to establish an easy route to produce mesoporous TML thin films. The salts (LiNO3 and [Co(H2 O)6 ](NO3 )2 or [Mn(H2 O)4 ](NO3 )2 ) and two surfactants (10-lauryl ether and cethyltrimethylammonium bromide (CTAB) or cethyltrimethylammonium nitrate (CTAN)) form stable liquid crystalline mesophases...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29148610/can-coordination-driven-supramolecular-self-assembly-reactions-be-conducted-from-fully-aliphatic-linkers
#18
Christophe Lescop, Mehdi Elsayed Moussa, Sloane Evariste, Barbara Kräemer, Régis Réau, Manfred Scheer
A series of fully aliphatic cyano-capped ditopic linkers with increasing lengths were reacted with a pre-assembled Cu(I) bimetallic molecular clip bearing short intermetallic distances. It is shown that, depending on the length of the ditopic linkers, a rational design of unprecedented supramolecular compact metallacycles bearing fully aliphatic walls is possible. The specific pre-organized molecular arrangement of the molecular clip used favors stabilizing interlinker London dispersion interactions allowing, as the linkers' lengths increase, the selective formation of discrete compact metallacycles at the expense of 1D coordination polymers...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29148604/biomass-derived-n-doped-carbons-with-silica-supported-ultrasmall-zno-nanoparticles-robust-catalysts-for-the-green-synthesis-of-benzimidazoles
#19
Bo Chen, Chan Zhang, Libo Niu, Xiaozhen Shi, Huiling Zhang, Xingwang Lan, Guoyi Bai
Ultrasmall ZnO nanoparticles anchored on N-doped carbons with silica support (ZnO/SiO2-NC) were fabricated from chitosan and metal ions using a one-pot self-assembly strategy, and were successfully applied to the synthesis of 2-arylbenzimidazoles under mild conditions. These catalysts showed excellent stability and could be used six times without loss of conversion and selectivity. Using silica gel and biomass chitosan as a source of hydrophilic N-doped carbon facilitated the uniform dispersion of the ZnO nanoparticles in methanol and therefore their contact with reactants, contributing to a high catalytic performance...
November 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29148551/tunable-fluorescence-behaviors-of-a-supramolecular-system-based-on-a-fluorene-derivative-and-cucurbit-8-uril-and-its-application-for-atp-sensing
#20
Rongqin Ye, Qianling Cui, Chuang Yao, Ronghua Liu, Lidong Li
In this work, we developed a supramolecular fluorescent system based on host-guest interactions between a fluorene derivative carrying two bispyridinium units (FPy) and cucurbit[8]uril (CB[8]). In aqueous solution, the system showed outstanding tunable emission properties. After being encapsulated into the rigid hydrophobic cavity of the CB[8] host, the fluorescence emission of fluorene had an obvious red-shift with enhanced quantum yield. Interestingly, the emission behavior of the FPy/CB[8] complex showed a two-step self-assembly process when the molar ratio of FPy to CB[8] changed from 1 : 1 to 1 : 2...
November 17, 2017: Physical Chemistry Chemical Physics: PCCP
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