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1.
Genome Biol ; 25(1): 250, 2024 Sep 30.
Article in English | MEDLINE | ID: mdl-39350172

ABSTRACT

BACKGROUND: Root nodule symbiosis (RNS) is a fascinating evolutionary event. Given that limited genes conferring the evolution of RNS in Leguminosae have been functionally validated, the genetic basis of the evolution of RNS remains largely unknown. Identifying the genes involved in the evolution of RNS will help to reveal the mystery. RESULTS: Here, we investigate the gene loss event during the evolution of RNS in Leguminosae through phylogenomic and synteny analyses in 48 species including 16 Leguminosae species. We reveal that loss of the Lateral suppressor gene, a member of the GRAS-domain protein family, is associated with the evolution of RNS in Leguminosae. Ectopic expression of the Lateral suppressor (Ls) gene from tomato and its homolog MONOCULM 1 (MOC1) and Os7 from rice in soybean and Medicago truncatula result in almost completely lost nodulation capability. Further investigation shows that Lateral suppressor protein, Ls, MOC1, and Os7 might function through an interaction with NODULATION SIGNALING PATHWAY 2 (NSP2) and CYCLOPS to repress the transcription of NODULE INCEPTION (NIN) to inhibit the nodulation in Leguminosae. Additionally, we find that the cathepsin H (CTSH), a conserved protein, could interact with Lateral suppressor protein, Ls, MOC1, and Os7 and affect the nodulation. CONCLUSIONS: This study sheds light on uncovering the genetic basis of the evolution of RNS in Leguminosae and suggests that gene loss plays an essential role.


Subject(s)
Evolution, Molecular , Fabaceae , Phylogeny , Plant Proteins , Root Nodules, Plant , Symbiosis , Symbiosis/genetics , Root Nodules, Plant/microbiology , Root Nodules, Plant/genetics , Plant Proteins/genetics , Plant Proteins/metabolism , Fabaceae/genetics , Fabaceae/microbiology , Gene Expression Regulation, Plant , Plant Root Nodulation/genetics , Medicago truncatula/genetics , Medicago truncatula/microbiology , Genes, Plant , Glycine max/genetics , Glycine max/microbiology
2.
Heliyon ; 10(17): e37227, 2024 Sep 15.
Article in English | MEDLINE | ID: mdl-39296007

ABSTRACT

Our previous studies have shown that the novel selective RNA polymerase I inhibitor CX-5461 suppresses proliferation of vascular smooth muscle cells, mainly by inducing DNA damage response (DDR), including activations of ataxia telangiectasia mutated (ATM)/ATM and Rad3-related (ATR) and p53. Currently, there is no information about the molecular mechanism(s) underlying CX-5461-induced DDR in vascular cells, while the results obtained in cancer cells and immortalized cell lines are controversial. In this study, we examined the responses of various DDR pathways to CX-5461 treatment in primary aortic smooth muscle cells isolated from normal adult Sprague Dawley rats. We demonstrated that CX-5461-induced DDR was not associated with activations of the nucleotide excision repair, DNA mismatch repair, or the non-homologous end joining pathways, while the homologous recombination pathway was activated. However, the alkaline comet assay did not show massive DNA double strand breaks in CX-5461-treated cells. Instead, CX-5461-induced DDR appeared to be related to induction of DNA replication stress, which was not attributable to increased formation of G-quadruplex or R-loop structures, but might be explained by the increased replication-transcription conflict. CX-5461-induced DDR was not exclusively confined to rDNA within the nucleolar compartment; the extra-nucleolar DDR might represent a distinct secondary response related to the downregulated Rad51 expression in CX-5461-treated cells. In summary, we suggest that DNA replication stress may be the primary molecular event leading to downstream ATM/ATR and p53 activations in CX-5461-treated vascular smooth muscle cells. Our results provide further insights into the molecular basis of the beneficial effects of CX-5461 in proliferative vascular diseases.

3.
Heliyon ; 10(18): e37730, 2024 Sep 30.
Article in English | MEDLINE | ID: mdl-39323850

ABSTRACT

Background: Stroke, which is mainly caused by thrombus formation in the left atrial appendage, represents the most prevalent complication of atrial fibrillation (AF). Both percutaneous left atrial appendage occlusion (p-LAAO) and surgical LAAO (s-LAAO) are used to treat AF and prevent stroke events. However, no head-to-head randomized controlled trials (RCTs) compared these strategies. Objective: To examine the efficacy and safety of diverse strategies for reducing stroke risk using a network meta-analysis (NMA). Methods: PubMed, EMBASE, and Cochrane repositories were explored to identify RCTs involving p-LAAO or s-LAAO, and five were included for NMA. This investigation adhered to the guidelines outlined in the Preferred Reporting Items for Systematic Reviews and Meta-analyses. The NMA was pooled using the Bayesian random effect framework. All findings were expressed as odds ratios accompanied by a 95 % confidence interval.The primary efficacy endpoint was any stroke (AS), and the secondary efficacy endpoint was combined AS and systematic embolism (AS/SE). The primary and secondary safety endpoints were major bleeding (MB) and all-cause death (ACD), respectively. Results: Our meta-analysis incorporated 6337 individuals diagnosed with AF. The NMA demonstrated a reducing trend in AS and AS/SE for s-LAAO versus p-LAAO, while p-LAAO showed a benefit in reducing MB and ACD. Conclusions: and Relevance: s-LAAO could potentially benefit individuals at elevated risk for stroke, whereas p-LAAO may be linked to a reduced likelihood of bleeding.

4.
J Integr Plant Biol ; 2024 Sep 03.
Article in English | MEDLINE | ID: mdl-39225562

ABSTRACT

Soybean rust (SBR), caused by an obligate biotrophic pathogen Phakopsora pachyrhizi, is a devastating disease of soybean worldwide. However, the mechanisms underlying plant invasion by P. pachyrhizi are poorly understood, which hinders the development of effective control strategies for SBR. Here we performed detailed histological characterization on the infection cycle of P. pachyrhizi in soybean and conducted a high-resolution transcriptional dissection of P. pachyrhizi during infection. This revealed P. pachyrhizi infection leads to significant changes in gene expression with 10 co-expressed gene modules, representing dramatic transcriptional shifts in metabolism and signal transduction during different stages throughout the infection cycle. Numerous genes encoding secreted protein are biphasic expressed, and are capable of inhibiting programmed cell death triggered by microbial effectors. Notably, three co-expressed P. pachyrhizi apoplastic effectors (PpAE1, PpAE2, and PpAE3) were found to suppress plant immune responses and were essential for P. pachyrhizi infection. Double-stranded RNA coupled with nanomaterials significantly inhibited SBR infection by targeting PpAE1, PpAE2, and PpAE3, and provided long-lasting protection to soybean against P. pachyrhizi. Together, this study revealed prominent changes in gene expression associated with SBR and identified P. pachyrhizi virulence effectors as promising targets of RNA interference-based soybean protection strategy against SBR.

5.
Article in English | MEDLINE | ID: mdl-39133008

ABSTRACT

BACKGROUND AND OBJECTIVES: The percutaneous full-endoscopic C2 ganglionectomy (PEC2G), an innovative procedure developed for the surgical treatment of intractable occipital neuralgia, was firstly reported by us in 2021. However, a universally accepted and well-articulated protocol modality remains elusive. The primary objective of this anatomic investigation was to meticulously elucidate the standard procedural steps of PEC2G and assess the anatomic features supporting the safe implementation of PEC2G. METHODS: Eighteen fresh adult cadavers were incorporated into this study. From this sample, 3 cadavers were subjected to bilateral PEC2G. Each procedure was documented and assessed, leading to the formulation of standard procedure criteria for PEC2G. Subsequently, 10 sets of anatomic parameters pertinent to this procedure were identified, quantified, and analyzed in 15 cadavers after complete bilateral endoscopic exposure of the C2 ganglion. An assessment of the technical feasibility and potential constraints associated with PEC2G was conducted, providing invaluable insights into the procedure's anatomic considerations. RESULTS: All 3 cadavers successfully underwent the PEC2G without any observed complications, such as dura tears or vertebral artery injuries. The C2 inferior articular process emerged as the optimal bony target for puncture, with the C2 pedicle serving as the standard guiding landmark en route to the C2 ganglion. In the 15 cadavers subjected to the planned procedure, 10 sets of anatomic parameters were quantified, establishing a foundational understanding of the anatomy in the context of PEC2G procedure. The results demonstrated that the characteristic of anatomic data pertinent to surgical site supported the safe implementation of PEC2G. CONCLUSION: This study contributes the standard surgical steps and crucial anatomic parameters relevant to PEC2G. The characteristic of anatomic data bolsters the safety credentials of this technique, which offers a reliable approach to achieve C2 ganglionectomy. These insights undeniably establish a robust foundation for the ongoing refinement and broader adoption of PEC2G.

6.
J Integr Plant Biol ; 2024 Aug 02.
Article in English | MEDLINE | ID: mdl-39092779

ABSTRACT

Gene innovation plays an essential role in trait evolution. Rhizobial symbioses, the most important N2-fixing agent in agricultural systems that exists mainly in Leguminosae, is one of the most attractive evolution events. However, the gene innovations underlying Leguminosae root nodule symbiosis (RNS) remain largely unknown. Here, we investigated the gene gain event in Leguminosae RNS evolution through comprehensive phylogenomic analyses. We revealed that Leguminosae-gain genes were acquired by gene duplication and underwent a strong purifying selection. Kyoto Encyclopedia of Genes and Genomes analyses showed that the innovated genes were enriched in flavonoid biosynthesis pathways, particular downstream of chalcone synthase (CHS). Among them, Leguminosae-gain type Ⅱ chalcone isomerase (CHI) could be further divided into CHI1A and CHI1B clades, which resulted from the products of tandem duplication. Furthermore, the duplicated CHI genes exhibited exon-intron structural divergences evolved through exon/intron gain/loss and insertion/deletion. Knocking down CHI1B significantly reduced nodulation in Glycine max (soybean) and Medicago truncatula; whereas, knocking down its duplication gene CHI1A had no effect on nodulation. Therefore, Leguminosae-gain type Ⅱ CHI participated in RNS and the duplicated CHI1A and CHI1B genes exhibited RNS functional divergence. This study provides functional insights into Leguminosae-gain genetic innovation and sub-functionalization after gene duplication that contribute to the evolution and adaptation of RNS in Leguminosae.

7.
Pain Physician ; 27(5): E611-E618, 2024 Jul.
Article in English | MEDLINE | ID: mdl-39087974

ABSTRACT

BACKGROUND: Spinal cord stimulation is an established technique wherein diverse electrode types are strategically implanted within the spinal epidural space for neuromodulation. Traditional percutaneous puncture cylindrical electrodes (PEs) are predominantly implanted by interventionalists utilizing a percutaneous technique under the monitor of radiation, which is a nonvisualized procedure. OBJECTIVE: Our study aimed to assess the feasibility of percutaneous endoscope-assisted visualized implantation approach for PEs, delineating its specific merits and demerits compared to the traditional method. STUDY DESIGN: Laboratory study with Institutional Review Board Number B2023-056SETTING: Clinical Anatomy Research Center, Fudan University. METHODS: Eight freshly procured adult cadavers (4 women and 4 men) were operated on in this study. They were divided into either Group A or Group B, each encompassing 4 cadavers. Group A was subjected to endoscope-assisted PEs implantation, whereas Group B followed the conventional PEs implantation route.In both groups the operative time of introducer needles placement (OTNP), total operative time (TOT), fluoroscopy time of introducer needles placement (FTNP), and total fluoroscopy time (TFT) were documented and analyzed. Furthermore, the precise positioning of the PEs and any ensuing complications were systematically examined. RESULTS: Both Group A and Group B successfully executed all predetermined surgical steps. A total of 16 PEs were implanted (dual electrodes in each cadaver): 8 using the percutaneous endoscope-assisted visualized approach (Group A) and 8 via the traditional methodology (Group B). Group A's mean ± SD durations for OTNP, TOT, FTNP, and TFT were 10.25 ± 1.03 minutes, 31.63 ± 5.87 minutes, 4.58 ± 1.35 seconds, and 43.73 ± 14.46 seconds, respectively. In contrast, Group B exhibited mean ± SD times of 11.55 ± 2.81 minutes, 44.75 ± 7.85 minutes, 23.53 ± 4.16 seconds, and 66.30 ± 6.35 seconds for the same metrics. No discernible statistical difference in OTNP and TOT emerged between the groups. However, Group A demonstrated reduced durations for both FTNP and TFT compared to Group B. The optimal position of the PEs was verified via fluoroscopy, with no recorded instances of dura rupture. These outcomes suggest that this endoscope-assisted technique neither increases surgical time nor compromises efficacy. Instead, it leads to a marked reduction in fluoroscopic duration relative to the traditional methodology. LIMITATIONS: Anatomical study on a human cadaver, the quantity of cadavers, and the procedure's steep learning curve. CONCLUSION: With the assistance of percutaneous spinal endoscopy, introducer needles can be punctured through the ligamentum flavum at the anticipated interlaminar window locus under direct visualization, improving the convenience of the puncture and reducing fluoroscopic exposure. It is a viable alternative for surgeons from diverse training backgrounds to implant PEs, particularly benefiting those well-versed in endoscopic spine surgery techniques.


Subject(s)
Cadaver , Electrodes, Implanted , Feasibility Studies , Spinal Cord Stimulation , Humans , Spinal Cord Stimulation/methods , Spinal Cord Stimulation/instrumentation , Female , Male , Endoscopy/methods , Endoscopy/instrumentation
8.
Foods ; 13(13)2024 Jun 22.
Article in English | MEDLINE | ID: mdl-38998483

ABSTRACT

Polycyclic aromatic hydrocarbons (PAHs) represent a category of persistent organic pollutants that pose a global concern in the realm of food safety due to their recognized carcinogenic properties in humans. Food can be contaminated with PAHs that are present in water, air, or soil, or during food processing and cooking. The wide and varied sources of PAHs contribute to their persistent contamination of food, leading to their accumulation within these products. As a result, monitoring of the levels of PAHs in food is necessary to guarantee the safety of food products as well as the public health. This review paper attempts to give its readers an overview of the impact of PAHs on crops, their occurrence and sources, and the methodologies employed for the sample preparation and detection of PAHs in food. In addition, possible directions for future research are proposed. The objective is to provide references for the monitoring, prevention, and in-depth exploration of PAHs in food.

9.
ACS Nano ; 18(29): 18801-18833, 2024 Jul 23.
Article in English | MEDLINE | ID: mdl-38979917

ABSTRACT

Tumor vaccines, an important part of immunotherapy, prevent cancer or kill existing tumor cells by activating or restoring the body's own immune system. Currently, various formulations of tumor vaccines have been developed, including cell vaccines, tumor cell membrane vaccines, tumor DNA vaccines, tumor mRNA vaccines, tumor polypeptide vaccines, virus-vectored tumor vaccines, and tumor-in-situ vaccines. There are also multiple delivery systems for tumor vaccines, such as liposomes, cell membrane vesicles, viruses, exosomes, and emulsions. In addition, to decrease the risk of tumor immune escape and immune tolerance that may exist with a single tumor vaccine, combination therapy of tumor vaccines with radiotherapy, chemotherapy, immune checkpoint inhibitors, cytokines, CAR-T therapy, or photoimmunotherapy is an effective strategy. Given the critical role of tumor vaccines in immunotherapy, here, we look back to the history of tumor vaccines, and we discuss the antigens, adjuvants, formulations, delivery systems, mechanisms, combination therapy, and future directions of tumor vaccines.


Subject(s)
Cancer Vaccines , Neoplasms , Cancer Vaccines/immunology , Cancer Vaccines/therapeutic use , Cancer Vaccines/chemistry , Humans , Neoplasms/immunology , Neoplasms/therapy , Immunotherapy , Drug Delivery Systems , Animals , Liposomes/chemistry
11.
Small ; : e2401845, 2024 Jul 05.
Article in English | MEDLINE | ID: mdl-38966869

ABSTRACT

Drug-resistant bacterial infections and their lipopolysaccharide-related inflammatory complications continue to pose significant challenges in traditional treatments. Inspired by the rapid initiation of resident macrophages to form aggregates for efficient antibacterial action, this study proposes a multifunctional and enhanced antibacterial strategy through the construction of novel biomimetic cell membrane polypeptide nanonets (R-DPB-TA-Ce). The design involves the fusion of end-terminal lipidated polypeptides containing side-chain cationic boronic acid groups (DNPLBA) with cell membrane intercalation engineering (R-DPB), followed by coordination with the tannic acid-cerium complex (TA-Ce) to assemble into a biomimetic nanonet through boronic acid-polyphenol-metal ion interactions. In addition to the ability of RAW 264.7 macrophages cell membrane components' (R) ability to neutralize lipopolysaccharide (LPS), R-DPB-TA-Ce demonstrated enhanced capture of bacteria and its LPS, leveraging nanoconfinement-enhanced multiple interactions based on the boronic acid-polyphenol nanonets skeleton combined with polysaccharide. Utilizing these advantages, indocyanine green (ICG) is further employed as a model drug for delivery, showcasing the exceptional treatment effect of R-DPB-TA-Ce as a new biomimetic assembled drug delivery system in antibacterial, anti-inflammatory, and wound healing promotion. Thus, this strategy of mimicking macrophage aggregates is anticipated to be further applicable to various types of cell membrane engineering for enhanced antibacterial treatment.

12.
Adv Healthc Mater ; : e2401993, 2024 Jul 27.
Article in English | MEDLINE | ID: mdl-39072961

ABSTRACT

Excessive use of antibiotics and the formation of bacterial biofilms can lead to persistent infections caused by drug-resistant bacteria, rendering ineffective immune responses and even life-threatening. There is an urgent need to explore synergistic antibacterial therapies across all stages of infection. Drawing inspiration from the antibacterial properties of neutrophil extracellular traps (NETs) and integrating the bacterial biofilm dispersal mechanism involving boronic acid-catechol interaction, the multifunctional bismuth-based polypeptide nanonets (PLBA-Bi-Fe-TA) are developed. These nanonets are designed to capture bacteria through a coordination complex involving cationic polypeptides (PLBA) with boronic acid-functionalized side chains, alongside metal ions (bismuth (Bi) and iron (Fe)), and tannic acid (TA). Leveraging the nanoconfinement-enhanced high-contact network-driven multiple efficiency, PLBA-Bi-Fe-TA demonstrates the excellent ability to swiftly capture bacteria and their extracellular polysaccharides. This interaction culminates in the formation of a highly hydrophilic complex, effectively enabling the rapid inhibition and dispersion of antibiotic-resistant bacterial biofilms, while Fe-TA shows mild photothermal ability to further assist fluffy mature biofilm. In addition, Bi is beneficial to regulate the polarization of macrophages to pro-inflammatory phenotype to further kill escaping biofilm bacteria. In summary, this novel approach offers a promising bionic optimization strategy for treating bacterial-associated infections at all stages through synergetic treatment.

13.
Cell Death Differ ; 2024 Jun 25.
Article in English | MEDLINE | ID: mdl-38918620

ABSTRACT

Mitochondrial dysfunction plays a pivotal role in the pathogenesis of Parkinson's disease (PD). As a mitochondrial governor, voltage-dependent anion channel 1 (VDAC1) is critical for cell survival and death signals and implicated in neurodegenerative diseases. However, the mechanisms of VDAC1 regulation are poorly understood and the role of tripartite motif-containing protein 31 (TRIM31), an E3 ubiquitin ligase which is enriched in mitochondria, in PD remains unclear. In this study, we found that TRIM31-/- mice developed age associated motor defects and dopaminergic (DA) neurodegeneration spontaneously. In addition, TRIM31 was markedly reduced both in nigrostriatal region of PD mice induced by MPTP and in SH-SY5Y cells stimulated by MPP+. TRIM31 deficiency significantly aggravated DA neurotoxicity induced by MPTP. Mechanistically, TRIM31 interacted with VDAC1 and catalyzed the K48-linked polyubiquitination to degrade it through its E3 ubiquitin ligase activity. In conclusion, we demonstrated for the first time that TRIM31 served as an important regulator in DA neuronal homeostasis by facilitating VDAC1 degradation through the ubiquitin-proteasome pathway. Our study identified TRIM31 as a novel potential therapeutic target and pharmaceutical intervention to the interaction between TRIM31 and VDAC1 may provide a promising strategy for PD.

15.
Medicine (Baltimore) ; 103(20): e38059, 2024 May 17.
Article in English | MEDLINE | ID: mdl-38758913

ABSTRACT

This study aims to dissect the evolution and pivotal shifts in Fine-Needle Aspiration (FNA) research for thyroid nodules over the past 2 decades, focusing on delineating key technological advancements and their impact on clinical practice. A comprehensive bibliometric analysis was conducted on 5418 publications from the Web of Science Core Collection database (2000-2023). Publications were rigorously selected based on their contributions to the advancement of FNA techniques and their influence on thyroid nodule management practices. Our analysis uncovered significant breakthroughs, most notably the incorporation of ultrasound and molecular diagnostics in FNA, which have markedly elevated diagnostic accuracy. A pivotal shift was identified towards minimally invasive post-FNA treatments, such as Radiofrequency Ablation, attributable to these diagnostic advancements. Additionally, the emergence of AI-assisted cytology represents a frontier in precision diagnostics, promising enhanced disease identification. The geographical analysis pinpointed the United States, Italy, and China as key contributors, with the United States leading in both publication volume and citation impact. This bibliometric analysis sheds light on the transformative progression in FNA practices for thyroid nodules, characterized by innovative diagnostic technologies and a trend towards patient-centric treatment approaches. The findings underscore the need for further research into AI integration and global practice standardization. Future explorations should focus on the practical application of these advancements in diverse healthcare settings and their implications for global thyroid nodule management.


Subject(s)
Bibliometrics , Thyroid Nodule , Thyroid Nodule/pathology , Humans , Biopsy, Fine-Needle/statistics & numerical data , Biopsy, Fine-Needle/methods
16.
IEEE Trans Cybern ; PP2024 May 21.
Article in English | MEDLINE | ID: mdl-38771679

ABSTRACT

Temporal knowledge graphs (TKGs) are receiving increased attention due to their time-dependent properties and the evolving nature of knowledge over time. TKGs typically contain complex geometric structures, such as hierarchical, ring, and chain structures, which can often be mixed together. However, embedding TKGs into Euclidean space, as is typically done with TKG completion (TKGC) models, presents a challenge when dealing with high-dimensional nonlinear data and complex geometric structures. To address this issue, we propose a novel TKGC model called multicurvature adaptive embedding (MADE). MADE models TKGs in multicurvature spaces, including flat Euclidean space (zero curvature), hyperbolic space (negative curvature), and hyperspherical space (positive curvature), to handle multiple geometric structures. We assign different weights to different curvature spaces in a data-driven manner to strengthen the ideal curvature spaces for modeling and weaken the inappropriate ones. Additionally, we introduce the quadruplet distributor (QD) to assist the information interaction in each geometric space. Ultimately, we develop an innovative temporal regularization to enhance the smoothness of timestamp embeddings by strengthening the correlation of neighboring timestamps. Experimental results show that MADE outperforms the existing state-of-the-art TKGC models.

17.
World J Gastrointest Oncol ; 16(3): 833-843, 2024 Mar 15.
Article in English | MEDLINE | ID: mdl-38577470

ABSTRACT

BACKGROUND: Traditional lymph node stage (N stage) has limitations in advanced gastric remnant cancer (GRC) patients; therefore, establishing a new predictive stage is necessary. AIM: To explore the predictive value of positive lymph node ratio (LNR) according to clinicopathological characteristics and prognosis of locally advanced GRC. METHODS: Seventy-four patients who underwent radical gastrectomy and lymphadenectomy for locally advanced GRC were retrospectively reviewed. The relationship between LNR and clinicopathological characteristics was analyzed. The survival analysis was performed using Kaplan-Meier survival curves and Cox regression model. RESULTS: Number of metastatic LNs, tumor diameter, depth of tumor invasion, Borrmann type, serum tumor biomarkers, and tumor-node-metastasis (TNM) stage were correlated with LNR stage and N stage. Univariate analysis revealed that the factors affecting survival included tumor diameter, anemia, serum tumor biomarkers, vascular or neural invasion, combined resection, LNR stage, N stage, and TNM stage (all P < 0.05). The median survival time for those with LNR0, LNR1, LNR2 and LNR3 stage were 61, 31, 23 and 17 mo, respectively, and the differences were significant (P = 0.000). Anemia, tumor biomarkers and LNR stage were independent prognostic factors for survival in multivariable analysis (all P < 0.05). CONCLUSION: The new LNR stage is uniquely based on number of metastatic LNs, with significant prognostic value for locally advanced GRC, and could better differentiate overall survival, compared with N stage.

18.
Org Lett ; 26(16): 3447-3452, 2024 Apr 26.
Article in English | MEDLINE | ID: mdl-38602315

ABSTRACT

A method was developed for the enantioselective formal 1,2-diamination of disubstituted ketenes using iminosulfinamides as nitrogen sources. The protocol involves the addition of lithium iminosulfinamides to ketenes to form N-iminosulfinyl amide metalloenolates. These metalloenolates then undergo a [2,3]-sigmatropic rearrangement to yield unnatural α,α-disubstituted α-amino acid derivatives with high enantiopurity. The chirality present at the sulfur atom in the iminosulfinamides is effectively transferred to α carbon of the resulting products, facilitating the highly enantioselective amination of ketenes.

19.
20.
Neural Netw ; 176: 106322, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38653128

ABSTRACT

In the realm of long document classification (LDC), previous research has predominantly focused on modeling unimodal texts, overlooking the potential of multi-modal documents incorporating images. To address this gap, we introduce an innovative approach for multi-modal long document classification based on the Hierarchical Prompt and Multi-modal Transformer (HPMT). The proposed HPMT method facilitates multi-modal interactions at both the section and sentence levels, enabling a comprehensive capture of hierarchical structural features and complex multi-modal associations of long documents. Specifically, a Multi-scale Multi-modal Transformer (MsMMT) is tailored to capture the multi-granularity correlations between sentences and images. This is achieved through the incorporation of multi-scale convolutional kernels on sentence features, enhancing the model's ability to discern intricate patterns. Furthermore, to facilitate cross-level information interaction and promote learning of specific features at different levels, we introduce a Hierarchical Prompt (HierPrompt) block. This block incorporates section-level prompts and sentence-level prompts, both derived from a global prompt via distinct projection networks. Extensive experiments are conducted on four challenging multi-modal long document datasets. The results conclusively demonstrate the superiority of our proposed method, showcasing its performance advantages over existing techniques.


Subject(s)
Neural Networks, Computer , Humans , Natural Language Processing , Algorithms
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