11 research outputs found
Capitalisation of research and development investment and enterprise value: a study on the threshold effect based on level of financialisation
This study uses a mathematical model to explore how enterprises’
financialisation levels affect the role of research and development
(R&D) investment capitalisation in enterprise value. We construct
a mathematical model involving the financialisation level, capitalised
R&D investment, and enterprise value. The sample comprises
A-share listed companies that disclosed the capitalisation of R&D
investment in the Shanghai and Shenzhen stock markets from
2014 to 2020. The results suggest that R&D investment capitalisation
positively impacts enterprise value, especially in the current
phase. With financialisation level as the threshold variable, R&D
investment capitalisation has a double threshold effect on enterprise
value in the current and next phases. Additionally, corporate
financial investment behaviour has a timely impact on capitalised
R&D investment but does not significantly impact enterprise value
in a future phase. Enterprises evidently choose financial investment
to enhance enterprise value by increasing capitalised R&D
investment. These results can help enterprises formulate financial
asset investment strategies and promote their development from
virtual to real. The government should standardise enterprises’
financial investment behaviour, prevent excessive financialisation,
and promote high-quality development of the real economy
Efficient and Accurate Arbitrary-Shaped Text Detection with Pixel Aggregation Network
Scene text detection, an important step of scene text reading systems, has
witnessed rapid development with convolutional neural networks. Nonetheless,
two main challenges still exist and hamper its deployment to real-world
applications. The first problem is the trade-off between speed and accuracy.
The second one is to model the arbitrary-shaped text instance. Recently, some
methods have been proposed to tackle arbitrary-shaped text detection, but they
rarely take the speed of the entire pipeline into consideration, which may fall
short in practical applications.In this paper, we propose an efficient and
accurate arbitrary-shaped text detector, termed Pixel Aggregation Network
(PAN), which is equipped with a low computational-cost segmentation head and a
learnable post-processing. More specifically, the segmentation head is made up
of Feature Pyramid Enhancement Module (FPEM) and Feature Fusion Module (FFM).
FPEM is a cascadable U-shaped module, which can introduce multi-level
information to guide the better segmentation. FFM can gather the features given
by the FPEMs of different depths into a final feature for segmentation. The
learnable post-processing is implemented by Pixel Aggregation (PA), which can
precisely aggregate text pixels by predicted similarity vectors. Experiments on
several standard benchmarks validate the superiority of the proposed PAN. It is
worth noting that our method can achieve a competitive F-measure of 79.9% at
84.2 FPS on CTW1500.Comment: Accept by ICCV 201
Comparative Transcriptome Analysis Reveals bmo-miR-6497-3p Regulate Circadian Clock Genes during the Embryonic Diapause Induction Process in Bivoltine Silkworm
Diapause is one of the survival strategies of insects for confronting adverse environmental conditions. Bombyx mori displays typical embryonic diapause, and offspring diapause depends on the incubation environment of the maternal embryo in the bivoltine strains of the silkworm. However, the molecular mechanisms of the diapause induction process are still poorly understood. In this study, we compared the differentially expressed miRNAs (DEmiRs) in bivoltine silkworm embryos incubated at diapause- (25 °C) and non-diapause (15 °C)-inducing temperatures during the blastokinesis (BK) and head pigmentation (HP) phases using transcriptome sequencing. There were 411 known miRNAs and 71 novel miRNAs identified during the two phases. Among those miRNAs, there were 108 and 74 DEmiRs in the BK and HP groups, respectively. By the Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of the predicted target genes of the DEmiRs, we found that aside from metabolism, the targets were also enriched in phototransduction-fly and insect hormone biosynthesis in the BK group and the HP group, respectively. Dual luciferase reporter assay illustrated that bmo-miR-6497-3p directly regulated Bmcycle and subsequently regulated the expression of circadian genes. These results imply that microRNAs, as vitally important regulators, respond to different temperatures and participate in the diapause induction process across species
First measurement of atmospheric mercury species in Qomolangma Natural Nature Preserve, Tibetan Plateau, and evidence of transboundary pollutant invasion
Located in the world's "third pole" and a remote region connecting the Indian plate and the Eurasian plate, Qomolangma National Nature Preserve (QNNP) is an ideal region to study the long-range transport of atmospheric pollutants. In this study, gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and particle-bound mercury (PBM) were continuously measured during the Indian monsoon transition period in QNNP. A slight increase in the GEM concentration was observed from the period preceding the Indian summer monsoon (1.31 +/- 0.42 ng m(-3)) to the Indian summer monsoon period (1.44 +/- 0.36 ng m(-3)), while significant decreases were observed in the GOM and PBM concentrations, with concentrations decreasing from 35.2 +/- 18.6 to 19.3 +/- 10.9 pg m(-3) (p < 0.001) for GOM and from 30.5 +/- 12.5 to 24.9 +/- 19.8 pg m(-3) (p < 0.001) for PBM. A unique daily pattern was observed in QNNP with respect to the GEM concentration, with a peak value before sunrise and a low value at noon. Relative to the (low) GEM concentrations, GOM concentrations (with a mean value of 21.4 +/- 13.4 pg m(-3), n = 1239) in this region were relatively high compared with the measured values in some other regions of China. A cluster analysis indicated that the air masses transported to QNNP changed significantly at different stages of the monsoon, and the major potential mercury (Hg) sources shifted from northern India and western Nepal to eastern Nepal and Bangladesh. As there is a large area covered in glaciers in QNNP, local glacier winds could increase the transboundary transport of pollutants and transport polluted air masses to the Tibetan Plateau. The atmospheric Hg concentration in QNNP in the Indian summer monsoon period was influenced by transboundary Hg flows. This highlights the need for a more specific identification of Hg sources impacting QNNP and underscores the importance of international cooperation regarding global Hg controls
MeCP2 Promotes Gastric Cancer Progression Through Regulating FOXF1/Wnt5a/β-Catenin and MYOD1/Caspase-3 Signaling Pathways
Methyl-CpG binding protein 2 (MeCP2) has recently been characterized as an oncogene frequently amplified in several types of cancer. However, its precise role in gastric cancer (GC) and the molecular mechanism of MeCP2 regulation are still largely unknown. Here we report that MeCP2 is highly expressed in primary GC tissues and the expression level is correlated with the clinicopathologic features of GC. In our experiments, knockdown of MeCP2 inhibited tumor growth. Molecular mechanism of MeCP2 regulation was investigated using an integrated approach with combination of microarray analysis and chromatin immunoprecipitation sequencing (ChIP-Seq). The results suggest that MeCP2 binds to the methylated CpG islands of FOXF1 and MYOD1 promoters and inhibits their expression at the transcription level. Furthermore, we show that MeCP2 promotes GC cell proliferation via FOXF1-mediated Wnt5a/β-Catenin signaling pathway and suppresses apoptosis through MYOD1-mediated Caspase-3 signaling pathway. Due to its high expression level in GC and its critical function in driving GC progression, MeCP2 represents a promising therapeutic target for GC treatment
Estimation of nutrient discharge from the Yangtze River to the East China Sea and the identification of nutrient sources
Recent Decline of Atmospheric Mercury Recorded by Androsace tapete on the Tibetan Plateau
We combined the mercury passive sampling
method and plant biomonitoring
together to understand the long-term changes of atmospheric mercury
concentrations on the Tibetan Plateau. Through the analysis of leaves
of Androsace tapete that represent
growing periods spanning the past decade, we explored the historical
records of atmospheric mercury from 2006 to 2015. Mercury concentration
was stable in the leaves of Androsace tapete during the period between 2006 and 2009, while a significant decrease
occurred after the year of 2010. The decreasing trend is consistent
with the monitoring data of the ground-based stations in other regions
globally. Despite the potential uncertainties using a passive sampling
method and biomonitoring technique, we suggest that Androsace tapete is a potential biomarker that could
provide reliable and effective historical records of atmospheric mercury
concentrations and offer new perspectives in monitoring mercury and
perhaps other atmospheric pollutants in regions where long-term active
monitoring was missing