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Multilabel classification for defect prediction in software engineering
Placenta-derived factors contribute to human iPSC-liver organoid growth
Revolutionizing Molecular cloning: Introducing FastCloneAssist, a Streamlined Python tool for optimizing primer design in restriction & ligation-independent PCR cloning
FastCloning, a paradigm shift in PCR cloning, has streamlined the process by eliminating laborious, multi-step traditional methods. This innovative technique, pioneered by Li et al. (2011), utilizes overlapping PCR primers and DpnI digestion for seamless integration of insert DNA into any desired vector position, regardless of restriction sites. This versatility makes FastCloning ideal for constructing fusion proteins, chimeric cDNAs, and manipulating genes with unparalleled ease. However, efficient primer design remains a critical hurdle, particularly for newcomers, as errors can lead to failed cloning attempts. To address this bottleneck, we present FastCloneAssist, a user-friendly Python program that automates FastCloning primer design with minimal user input. Users simply provide vector and insert sequences, along with the desired melting temperature (Tm), and FastCloneAssist provides best primer pairs after calculating optimal primer parameters for efficient PCR amplification and seamless DNA integration using established bioinformatics libraries. This open-source, freely available tool simplifies and accelerates cloning, making this powerful technique accessible to researchers of all levels and expediting scientific discovery.
A modified elastoplastic damage structural constitutive model of unsaturated Q3 undisturbed loess
Reply to: Weather anomalies cannot explain insect decline
PNPLA6 regulates retinal homeostasis by choline through phospholipid turnover
The impact of carbon information disclosure on corporate green technology innovation in the context of “dual carbon”—— Based on data from heavily polluting industries
In the current global response to climate change, the “dual carbon” goal has become a common development goal for all countries. In the context of “dual carbon”, China’s heavily polluting enterprises, as the main governance body, have become the necessary path for green transformation. Green technology innovation is important for heavily polluting industries to achieve green transformation. Starting from the perspective of environmental regulation based on information disclosure, this article mainly explores the mechanism of carbon information disclosure promoting green technology innovation in enterprises. This article takes heavily polluting enterprises in China from 2017 to 2021 as samples and innovatively constructs a carbon information disclosure indicator system based on the “dual carbon” background. Then, empirical tests examine the relationship between carbon information disclosure level, green technology innovation, and financing constraints. Research has shown that the quality of carbon information disclosure improves corporate green technology innovation; The quality of carbon information disclosure can promote green technology innovation by alleviating corporate financing constraints. The research results have theoretical value and significance for incentivizing heavily polluting enterprises to reduce carbon emissions and support China’s dual carbon goals.
Exploring the time-dependent behaviors of the rock mass roof of tunnels in open underground spaces of coal mines through numerical investigation
Scale dichotomization reduces customer racial discrimination and income inequality
FAN1-mediated translesion synthesis and POLQ/HELQ-mediated end joining generate interstrand crosslink-induced mutations
Functional role for Taz during hindbrain ventricle morphogenesis
The brain ventricle system, composed of the ventricular cavities and the cerebral spinal fluid within, performs critical functions including circulation of nutrients, removal of wastes, and cushioning of neural tissues. Development of the hindbrain ventricle requires a series of factors that coordinate its initial formation and subsequent inflation. Previous work has demonstrated that the transcriptional co-activator Taz (also known as WW domain-containing transcription regulator protein 1, Wwtr1), a component of Hippo signalling, is active at hindbrain rhombomere boundaries where it is regulated by mechanotransduction and promotes proliferation. Here, we demonstrate that Taz is also a critical regulator of hindbrain ventricle development. Zebrafish embryos that lack Taz protein fail to undergo initial midline separation of the hindbrain ventricle. Furthermore, the ventricle phenotype is a result of disorganized cytoskeletal F-actin and apicobasal polarity components. In addition, we have demonstrated that the hindbrain rhombomere boundaries are a location of active Wnt-Hippo crosstalk. Through our work, we propose a model where Taz protein is stabilized at rhombomere boundaries and promotes proper cell polarity necessary for formation of the brain ventricle.
Expression of tumor endothelial marker 1 in cardiac fibroblast contributes to atrial fibrosis in atrial fibrillation
Engineered enzymes for enantioselective nucleophilic aromatic substitutions
Abstract Nucleophilic aromatic substitutions (SNAr) are among the most widely used processes in the pharmaceutical and agrochemical industries1–4, allowing convergent assembly of complex molecules through C–C and C–X (X = O, N, S) bond formation. SNAr reactions are typically carried out using forcing conditions, involving polar aprotic solvents, stoichiometric bases and elevated temperatures, which do not allow for control over reaction selectivity. Despite the importance of SNAr chemistry, there are only a handful of selective catalytic methods reported that rely on small organic hydrogen-bonding or phase-transfer catalysts5–11. Here we establish a biocatalytic approach to stereoselective SNAr chemistry by uncovering promiscuous SNAr activity in a designed enzyme featuring an activated arginine12. This activity was optimized over successive rounds of directed evolution to afford an engineered biocatalyst, SNAr1.3, that is 160-fold more efficient than the parent and promotes the coupling of electron-deficient arenes with carbon nucleophiles with near-perfect stereocontrol (>99% enantiomeric excess (e.e.)). SNAr1.3 can operate at a rate of 0.15 s−1, perform more than 4,000 turnovers and can accept a broad range of electrophilic and nucleophilic coupling partners, including those that allow construction of challenging 1,1-diaryl quaternary stereocentres. Biochemical, structural and computational studies provide insights into the catalytic mechanism of SNAr1.3, including the emergence of a halide binding pocket shaped by key catalytic residues Arg124 and Asp125. This study brings a landmark synthetic reaction into the realm of biocatalysis to provide an efficient and versatile platform for catalytic SNAr chemistry.
Dissipative charge transport in organic mixed ionic-electronic conductor channels
Digital PCR characterizes epithelial cell populations in murine duodenal organoids
Three-dimensional cultures are powerful tools to recapitulate animal and human tissues. Under the influence of specific growth factors, adult stem cells differentiate and organize into 3D cultures named organoids. The molecular phenotyping of these structures is an essential step for validating an organoid model. However, the limited number of organoids generated in culture yields very low amounts of genetic material, making phenotyping difficult. Recently, digital PCR (dPCR) techniques have become available for the highly sensitive detection of genetic material at low concentrations. The aim of this work was to apply dPCR to the identification of the various cell populations expected to be present in murine duodenal organoids. Results show the potential use of dPCR as a genetic characterization tool for organoids.
Enhancing parkinson disease detection through feature based deep learning with autoencoders and neural networks
Four ways COVID changed virology: lessons from the most sequenced virus of all time
Sustainable bioactive hydrogels for organic contaminant elimination in wastewater
Aging aggravates cognitive dysfunction in spontaneously hypertensive rats by inducing cerebral microvascular endothelial dysfunction
Hypertension in the elderly can seriously lead to cerebral microvascular damage and promote the development of vascular cognitive impairment. While endothelial function is crucial in cerebral microvascular protection, it is unclear whether aging exacerbates hypertension-induced cognitive dysfunction through endothelial dysfunction. In this study, we injected D-galactose (D-gal) into 24 spontaneous hypertension rats (SHR) and 24 Wistar-Kyoto rats (WKY) for 12 weeks to induce aging. Firstly, the results of behavioral experiments showed that compared with WKY and SHRs injected with D-gal for 0 week, SHRs injected with D-gal for 12 weeks had more severe cognitive dysfunction and memory impairment. Subsequently, the pathological results showed that the pathological changes of brain microvessels and their structural and functional damage were more significant. After that, the results of molecular experiments showed enormous changes in endothelial damage indicators (nitric oxide (NO), endothelin (ET-1), platelet endothelial cell adhesion molecule-1(CD31) and endothelial tight junction protein), aggravation of blood-brain barrier (BBB) damage, microglial activation and upregulation of pro-inflammatory cytokines. Ultimately, the combination treatment of nimodipine and butylphthalide in WKY and SHRs injected with D-gal for 12 weeks showed that the two drugs could hugely improve the cognitive dysfunction in SHRs. In summary, we elaborated that aging exacerbates cognitive dysfunction in SHRs, which may be due to cerebral microvascular endothelial dysfunction, and even BBB damage and neuroinflammation, while the combination of nimodipine and butylphthalide can improve cognitive dysfunction in SHRs, providing a theoretical basis for the treatment of aging and hypertension-related diseases.