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2(3H)-Furanones are tremendously important not only because of their wide occurrence in bioactive compounds but also due to their versatility in organic synthesis. Here, a straightforward approach to 2(3H)-furanones from readily available tertiary propargylic alcohols with arylboronic acids in the presence of CO using rhodium as a catalyst has been established. The method exhibits a broad substrate scope tolerating useful functional groups with a moderate to high stereoselectivity.
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Stereoselective protonation is a challenge in asymmetric catalysis. The small size and high rate of transfer of protons mean that face-selective delivery to planar intermediates is hard to control, but it can unlock previously obscure asymmetric transformations. Particularly, when coupled with a preceding decarboxylation, enantioselective protonation can convert the abundant acid feedstocks into structurally diverse chiral molecules. Here an anchoring group strategy is demonstrated as a potential alternative and supplement to the conventional structural modification of catalysts by creating additional catalyst-substrate interactions. We show that a tailored benzamide group in aminomalonic acids can help build a coordinated network of non-covalent interactions, including hydrogen bonds, π-π interactions and dispersion forces, with a chiral acid catalyst. This allows enantioselective decarboxylative protonation to give α-amino acids. The malonate-based synthesis introduces side chains via a facile substitution of aminomalonic esters and thus can access structurally and functionally diverse amino acids.
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Aminas , Aminoácidos , Aminoácidos/química , Ésteres , Descarboxilación , Malonatos , CatálisisRESUMEN
Stereoselectivity control and understanding in the metal-catalyzed reactions are fundamental issues in catalysis. Here we report sterically controlled rhodium-catalyzed SN2'-type substitution reactions of optically active tertiary propargylic alcohols with arylmetallic species affording the non-readily available enantioenriched tetrasubstituted allenes via either exclusive syn- or anti-ß-OH elimination, respectively, under two sets of different reaction parameters. Detailed mechanistic experiments and density functional theory (DFT) studies reveal that the exclusive anti-Rh(I)-OH elimination is dictated by the simultaneous aid of in situ generated boric acid and ambient water, which act as the shuttle in the hydroxy relay to facilitate the Rh(I)-OH elimination process via a unique ten-membered cyclic transition state (anti-TS2_u). By contrast, the syn-Rh(III)-OH elimination in C-H bond activation-based allenylation reaction is controlled by a four-membered cyclic transition state (syn-TS3) due to the steric surroundings around the Rh(III) center preventing the approach of the other assisting molecules. Under the guidance of these mechanistic understandings, a stereodivergent protocol to construct the enantiomer of optically active tetrasubstituted allenes from the same starting materials is successfully developed.
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Introduction: Holt-Oram syndrome (HOS) is a rare genetic disorder characterized by upper limb abnormalities, congenital heart defects, and/or conduction abnormalities. Sequence alteration of T-box transcription factor 5 (TBX5) is correlated with the incidence of HOS. Case description: We present the case of a 24-year-old female with upper limb alterations (congenital dysplasia in the wrist and elbow joints) and an anomalous left main trunk arising from the right coronary sinus. The patient inherited a base T (reference C) at rs883079 from her mother and base C (reference T) at rs10850326 from her father, both of which belong to the 3'-untranslated region (UTR) of the TBX5 gene; no alterations in TBX5 expression or single-nucleotide polymorphisms (SNPs) in other exon areas were found. We explored the effects of TBX5 on cardiomyocytes using the HL-1 cell line and TBX5-knockdown cells. Discussion: Quantitative polymerase chain reaction analysis demonstrated that TEKT2, TEKT4, and SPTB expression decreased after TBX5 knockdown, while chromatin immunoprecipitation analysis further revealed that TBX5 binds to the TEKT2, TEKT4, and SPTB promoter regions to promote gene transcription. Our findings support a novel TBX5-related pathogenic mechanism in HOS.
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BACKGROUND AND AIM: Liver cancer stem cells (LCSCs) cause therapeutic refractoriness and relapse in hepatocellular carcinoma. Heat shock factor 1 (HSF1) plays versatile roles in multiple cancers. However, the role of HSF1 in LCSCs is not well understood. This study investigated the function and signal mechanisms of HSF1 in maintaining LCSC phenotypes. METHODS: We established two LCSC lines, HepG2-R and HuH-7-R. Constitutive activation of HSF1 was observed in these LCSCs. Specific short hairpin RNAs (shRNAs) and chemical inhibitors were used to identify the relationship between HSF1 expression and LCSCs phenotypes. RESULTS: We revealed a concomitant activation modality involving HSF1 and STAT3 in LCSCs and liver cancer tissues. We also found that liver cancer patients whose HSF1 and STAT3 mRNA expression levels were high presented with unfavorable clinicopathological characteristics. Moreover, the secretion of interleukin-8 (IL-8) was elevated in the LCSC medium and was directly regulated by HSF1 at the transcriptional level. In turn, IL-8 activated HSF1 and STAT3 signaling, and a neutralizing IL-8 antibody inhibited HSF1 and STAT3 activity, reduced cancer stem cell marker expression, and decreased LCSC microsphere formation. Simultaneous intervention with HSF1 and STAT3 led to synergistically suppressed stemness acquisition and growth suppression in the LCSCs in vivo and in vitro. CONCLUSIONS: Our study indicates that IL-8 mediates the crosstalk between the HSF1 and Stat3 signaling pathways in LCSCs and that the combined targeting of HSF1 and STAT3 is a promising treatment strategy for patients with advanced liver cancer.
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Factores de Transcripción del Choque Térmico , Neoplasias Hepáticas , Células Madre Neoplásicas , Factor de Transcripción STAT3 , Humanos , Comunicación Autocrina , Línea Celular Tumoral , Factores de Transcripción del Choque Térmico/metabolismo , Interleucina-8/metabolismo , Neoplasias Hepáticas/metabolismo , Neoplasias Hepáticas/patología , Recurrencia Local de Neoplasia/patología , Células Madre Neoplásicas/metabolismo , Factor de Transcripción STAT3/genética , Factor de Transcripción STAT3/metabolismo , Transducción de SeñalRESUMEN
Nafamostat mesylate (NM) affects coagulation and fibrinolysis and impedes obesity-associated protein demethylase activity, which regulates Na+/K+ transport properties and the NF-κB signaling pathway. NM significantly decreases macrophage, neutrophil, and T lymphocyte infiltration, thereby reducing inflammation and apoptosis after reperfusion and promoting recovery in patients with severe conditions such as near-fatal asthma and cardiac arrest. Extracorporeal life support (ECLS) devices are used for cardiac and/or pulmonary support as a bridge to recovery, decision, surgery, or transplant in patients with refractory cardio-circulatory or respiratory diseases and provide essential opportunities for organ support and patient survival. However, they can lead to some potential adverse events such as hemorrhage and thrombosis. NM provides a sustained innate immune response of coagulation and anti-inflammation in extracorporeal circuits, principally due to its activation of the contact and complement systems. Heparin is the main anticoagulant used in extracorporeal circuits; however, it may cause massive bleeding and heparin-induced thrombocytopenia. Although no antidote is available, NM has a very short half-life of approximately 8-10 min and might have positive effects on patients who require coagulation and anti-inflammation. NM has been used for anticoagulation in continuous renal replacement therapy, extracorporeal membrane oxygenation, hemodialysis, and left ventricular assist devices. In this review, we focused on the pharmacology, monitoring parameters, and considerations for the special use of NM in patients receiving ECLS. Our findings suggest that systemic anticoagulation with NM during ECLS might be a feasible and safe alternative with several advantages for critically ill patients with high-risk bleeding and might improve their prognosis.
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Oxigenación por Membrana Extracorpórea , Anticoagulantes/efectos adversos , Benzamidinas/efectos adversos , Coagulación Sanguínea , Oxigenación por Membrana Extracorpórea/efectos adversos , Guanidinas , Hemorragia/etiología , Heparina/efectos adversos , HumanosRESUMEN
Cyclopropanols and cyclopropylamines not only serve as important structural motifs in medicinal chemistry but also show diverse reactivities in organic synthesis. Owing to the high ring strain energy, the development of a general protocol from stable and readily available starting materials to afford these cyclopropyl derivatives remains a compelling challenge. Herein, we describe that a Ti-based catalyst can effectively promote the diastereoselective syntheses of cyclopropanols and cyclopropylamines from widely accessible carboxylic derivatives (acids, esters, amides) with terminal olefins. To the best of our knowledge, this method represents the first example of direct converting alkyl carboxylic acids into cyclopropanols. Distinct from conventional studies in Ti-mediated cyclopropanations with reactive alkyl Grignard reagents as nucleophiles or reductants, this protocol utilizes Mg and Me2SiCl2 to turn over the Ti catalyst. Our method exhibits broad substrate scope with good functional group compatibility and is amenable to late-stage synthetic manipulations of natural products and biologically active molecules.
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Alquenos , Titanio , Alquenos/química , Ácidos Carboxílicos/química , Catálisis , ÉsteresRESUMEN
Chirality is one of the most important types of steric information in nature. In addition to central chirality, axial chirality has been catching more and more attention from scientists. However, although much attention has recently been paid to the creation of axial chirality and the chirality transfer of allenes, no study has been disclosed as to the memory of such an axial chirality. The reason is very obvious: the chiral information is stored over three carbon atoms. Here, the first example of the memory of chirality (MOC) of allenes has been recorded, which was realized via an optically active alkylidene-π-allyl iridium intermediate, leading to a highly stereoselective electrophilic allenylation with amines. Specifically, we have established the transition metal-mediated highly stereoselective 2,3-allenylation of amines by using optically active 2,3-allenyl carbonates under the catalysis of a nonchiral iridium(iii) complex. This method is compatible with sterically bulky and small substituents on both amines and 2,3-allenyl carbonates and furnishes the desired optically active products with a high efficiency of chirality transfer. Further mechanistic experiments reveal that the isomerization of the optically active alkylidene-π-allyl iridium intermediate is very slow.
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A palladium-catalyzed C-O bond formation reaction between phenols and allenylic carbonates to give 2,3-allenic aromatic ethers with decent to excellent yields under mild reaction conditions has been described. A variety of synthetically useful functional groups are tolerated and the synthetic utility of this method has been demonstrated through a series of transformations of the allene moiety. By applying this reaction as the key step, the total syntheses of naturally occurring allenic aromatic ethers, eucalyptene and terricollene A (first synthesis; 4.5 g gram scale), have been accomplished.
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OBJECTIVE: To investigate the therapeutic effect of the problem management model based on the core concept of JCI on painless endoscopic mucosal resection (EMR) in gastric polyp patients. METHODS: A total of 128 patients with gastric polyps who underwent painless EMR in the Department of Gastroenterology in our hospital from January 2019 to February 2020 were recruited as the study cohort and randomly divided into a control group and an experimental group, with 64 patients in each group. The patients in the control group underwent routine nursing intervention, and the patients in the experimental group underwent the problem management model based on the core concept of JCI. The recovery of gastrointestinal function, the stress response [the heart rate (HR) and the mean arterial pressure (MAP)], the psychological status (the SAS and SDS scores), the complications, the hospital stay durations, the nursing quality, and the nursing satisfaction levels were compared between the two groups. RESULTS: After the intervention, the experimental group had earlier first exhaust and defecation times and shorter hospital stay durations than the control group (P<0.05). Both groups had increased HR and MAP, but they were lower in the experimental group than they were in the control group (P<0.05). The SAS and SDS scores were decreased in both groups, and were lower in the experimental group than they were in the control group (P<0.05). The experimental group had a lower incidence of complications than the control group, but the difference was not significantly different (P>0.05). The nursing quality and the nursing satisfaction levels in the experimental group were higher than they were in the control group (P<0.05). CONCLUSION: The problem management model based on the core concept of JCI has a good therapeutic effect on painless EMR in gastric polyp patients. The model is able to effectively reduce the stress response, promote the recovery of postoperative gastrointestinal function, decrease the incidence of complications, and improve the nursing quality and the nursing satisfaction levels.
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A 70-year-old man was admitted to our hospital due to "liver cirrhosis; grade 3 hypertension; pulmonary infection". On May 27, 2019, during upper abdomen plain and enhanced magnetic resonance imaging (MRI) and magnetic resonance cholangiopancreatography (MRCP), the patient experienced anaphylactic shock, manifested as sudden unconsciousness and lack of response, after intravenous administration of gadobenate dimeglumine (Multihance®). Gadobenate dimeglumine is a paramagnetic contrast used during diagnostic MRI. It has hepatobiliary specificity with very good imaging performance. A small amount is absorbed by normal liver cells after intravenous injection and excreted via the bile ducts while maintaining the chemical structure of gadobenate dimeglumine. It allows the visualization of local angiogenesis and perfusion, which reflect the hepatic blood supply and recent liver function, thereby providing a reference for clinical diagnosis. Gadobenate dimeglumine intravenous injection may cause adverse reactions such as nausea, dizziness, and anaphylactic shock. Anaphylactic shock is a known serious adverse reaction of gadobenate dimeglumine injection. In this paper, we report a case of gadobenate dimeglumine-induced anaphylactic shock based on the temporal relationship between the onset of symptoms and the injection. The patient received chest compressions and balloon-assisted ventilation in addition to rehydration and volume expansion and vasoactive drugs to maintain blood pressure, etc. The patient died despite treatments. In the clinical, physicians, nurses, and clinical pharmacists should closely monitor patients and promptly discontinue drug administration and provide symptomatic care in case of adverse reactions.
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Anafilaxia , Compuestos Organometálicos , Anciano , Anafilaxia/inducido químicamente , Medios de Contraste/efectos adversos , Humanos , Imagen por Resonancia Magnética , Masculino , Meglumina/efectos adversos , Meglumina/análogos & derivados , Compuestos Organometálicos/efectos adversosRESUMEN
BACKGROUND: The essence of energy metabolism has spread to the field of esophageal cancer (ESC) cells. Herein, we tried to develop a prognostic prediction model for patients with ESC based on the expression profiles of energy metabolism associated genes. MATERIALS AND METHODS: The overall survival (OS) predictive gene signature was developed, internally and externally validated based on ESC datasets including The Cancer Genome Atlas (TCGA), GSE54993 and GSE19417 datasets. Hub genes were identified in each energy metabolism related molecular subtypes by weighted gene correlation network analysis, and then enrolled for determination of prognostic genes. Univariate, LASSO and multivariate Cox regression analysis were applied to assess prognostic genes and build the prognostic gene signature. Kaplan-Meier curve, time-dependent receiver operating characteristic (ROC) curve, nomogram, decision curve analysis (DCA), and restricted mean survival time (EMST) were used to assess the performance of the gene signature. RESULTS: A novel energy metabolism based eight-gene signature (including UBE2Z, AMTN, AK1, CDCA4, TLE1, FXN, ZBTB6 and APLN) was established, which could dichotomize patients with significantly different OS in ESC. The eight-gene signature demonstrated independent prognostication potential in patient with ESC. The prognostic nomogram constructed based on the gene signature showed excellent predictive performance, whose robustness and clinical usability were higher than three previous reported prognostic gene signatures. CONCLUSIONS: Our study established a novel energy metabolism based eight-gene signature and nomogram to predict the OS of ESC, which may help in precise clinical management.
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Metabolismo Energético/genética , Neoplasias Esofágicas/genética , Neoplasias Esofágicas/mortalidad , Humanos , Persona de Mediana Edad , Pronóstico , Factores de Riesgo , Análisis de Supervivencia , Resultado del TratamientoRESUMEN
BACKGROUND: Studies regarding the predictive utility of the blood level of asymmetric dimethylarginine (ADMA) in patients with coronary artery disease (CAD) have yielded the conflicting findings. This meta-analysis sought to evaluate the prognostic value of blood ADMA level in CAD patients. METHODS: Potentially relevant studies were identified by searching PubMed and Embase database until August 12, 2020. Cohort studies evaluating the association of blood ADMA level with all-cause mortality, cardiovascular mortality, and major adverse cardiovascular events (MACEs) were included. A random effect model was applied to pool the multivariable-adjusted risk ratio (RR) and 95% confidence intervals (CI) for the highest versus lowest ADMA level. RESULTS: Data were retrieved from 11 studies enrolling a total of 9496 CAD patients. When compared the highest to the lowest ADMA level, the pooled RR was 2.10 (95% CI 1.46-3.02) for all-cause mortality, 2.49 (95% CI 1.34-4.65) for cardiovascular mortality, and 1.71 (95% CI 1.27-2.32) for MACEs, respectively. However, subgroup analysis showed that there were no significant association between elevated ADMA level and all-cause mortality in acute coronary syndrome (RR 2.11; 95% CI 0.93-4.78) and follow up ≤ 1 year (RR 2.15; 95% CI 0.56-8.25) subgroup. CONCLUSIONS: Elevated blood ADMA level is possibly an independent predictor of all-cause mortality, cardiovascular mortality, and MACEs in CAD patients. Measurement of blood level of ADMA may improve risk classification of CAD. However, these findings should be interpreted with caution because of the limited number of studies included.
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Arginina/análogos & derivados , Enfermedad de la Arteria Coronaria/diagnóstico , Arginina/sangre , Biomarcadores/sangre , Enfermedad de la Arteria Coronaria/sangre , Enfermedad de la Arteria Coronaria/mortalidad , Humanos , PronósticoRESUMEN
This work reports a case of rashes on multiple parts of the body following cesarean delivery caused by routine use of cefuroxime sodium and morphine during the perioperative period. A 29-year-old woman underwent a lower segment cesarean section under combined spinal-epidural anesthesia. During surgery, cefuroxime sodium was administered intravenously following the division of the umbilical cord for the prevention of infection. Morphine hydrochloride was given for analgesia at the end of the procedure. Rashes and pruritus appeared on the patient's abdomen, back and thighs. Cephalosporins and opioids may cause rashes and pruritus. According to the patient's physical signs and the time of drug injection, we considered the rash and pruritus adverse reactions caused by cefuroxime sodium and morphine hydrochloride. After the discontinuation of the medications, antiallergic treatment and the other treatment of symptoms, the patient's symptoms gradually subsided. To this end, we speculate that cefuroxime sodium or morphine hydrochloride cause adverse reactions, including rashes in patients. Physicians, nurses, and clinical pharmacists should closely observe patients who receive these medications. The medications should be at once stopped if an adverse reaction occurs.
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Cesárea , Exantema , Adulto , Analgésicos Opioides/efectos adversos , Cesárea/efectos adversos , Exantema/inducido químicamente , Femenino , Humanos , Morfina , Embarazo , Prurito/inducido químicamenteRESUMEN
A 56-year-old male patient was admitted due to a "rectal malignant tumor". He suffered from rash and neutropenia after multiple chemotherapy sessions including oxaliplatin, 5-fluorouracil (5- FU), and calcium folinate injection (CF) which are called FOLFOX regimen for short. The rash was treated with methylprednisolone + promethazine + calcium gluconate, and the neutropenia was treated by subcutaneous injection of the Recombinant Human Granulocyte Colony-Stimulating Factor Injection, the symptoms were relieved. Moreover, rashes and neutropenia are known common adverse reactions after intravenous administration of FOLFOX regimen. Based on the patient's symptoms and the timing of drug administration, a diagnosis of "rash and neutropenia due to the use of FOLFOX regimen" was made. Oxaliplatin and CF may also cause allergic reactions, including skin erythema and anaphylactic shock, etc. Once allergic reaction occurs, the fatality rate is higher than that of Penicillin. Therefore, sufficient attention should be paid to the patients reported in this paper who received FOLFOX regimen for multiple times and had multiple rashes and adverse reactions of neutropenia. Medical staff should closely monitored the adverse reactions and changes in vital signs of patients treated with this regimen during chemotherapy, and the chemotherapy regimen should be adjusted or terminated when necessary. The adverse reactions reported in this article deserve clinical attention.
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Exantema , Fluorouracilo/efectos adversos , Neutropenia , Oxaliplatino/efectos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Exantema/inducido químicamente , Humanos , Leucovorina/efectos adversos , Masculino , Persona de Mediana Edad , Neutropenia/inducido químicamente , Resultado del TratamientoRESUMEN
Enabled by the newly developed ligand, Ming-Phos, the first example of palladium-catalyzed highly enantioselective coupling of racemic propargylic benzoates with organoboronic acids for chiral allenes synthesis has been developed. Excellent asymmetric induction has been achieved with a decent substrate scope. Synthetic potentials for the construction of polycyclic compounds with multiple chiral centers have been demonstrated.
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BACKGROUND: The presence of residual DNA carried by biological products in the body may lead to an increased oncogenicity, infectivity, and immunomodulatory risk. Therefore, current agencies including WHO, EU, and the FDA limited the accepted amounts of residual DNA (less than 10 ng or 100 pg/dose). Among the methods of detecting residual DNA, qPCR is considered to be the most practical for residual DNA quantitation due to its sensitivity, accuracy, precision, and time-saving. RESULTS: In this study, the detection capacity of this method was determined by comparing the detected concentration of the commercial kit and the self-designed primer/probe set after the same treatment of the extraction method. Then, a universal sample pretreatment method based on a co-precipitant was optimized. The validation results demonstrated that the method has appropriate specificity, sensitivity, accuracy, and precision according to ICH guidelines. The limit of detection and quantitation reached 3 fg/ul and 0.3 pg/reaction respectively, which satisfies the requirement of limit of residual DNA detection in biologics. Spike recovery (82.3-105.7%) showed that the proposed qPCR assay was accurate and has good extraction efficiency. Moreover, the precision of the method based on intra- and inter-assay was 0.065-0.452% and 0.471-1.312%, respectively. CONCLUSIONS: These results all indicated that the method for determination of residual DNA in biological products expressed from CHO cells is sensitive, accurate and robust.
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Chemical vapor deposition (CVD) is widely applied in synthesizing high quality graphene, whose size, shape and structure are strongly impacted by the hydrogen concentration and, however, its role is not fully understood. In the traditional CVD, the concentration of the hydrogen keeps the constant in whole synthesis process and subsequently the nucleation and growth process are carried out simultaneously, therefore, its roles are usually confused and indistinguishable. In this report, the role of hydrogen on the growth of graphene nanostructure was creatively studied by introducing a two-step method which divided the nucleation and growth process for the first time. In the first step, the hexagonal graphene domain grown with the same conditions was used as precursor to eliminate the impact of the nucleation. In the second step, the role of hydrogen on the growth of graphene nanostructure was investigated by controlling the hydrogen concentration. The evolution behavior of the graphene nanostructure with the hydrogen concentration was systematically investigated. Two roles of the hydrogen, namely growth and etching modes, are clearly disclosed and then a possible mechanism was proposed. The results shown here may provide valuable guidance to understand the graphene growth mechanism and further advance the synthesis of unique graphene nanostructure.
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The clinical use of doxorubicin (DOX) is limited by its toxic effect. However, there is no specific drug that can prevent DOX-related cardiac injury. C1qTNF-related protein-6 (CTRP6) is a newly identified adiponectin paralog with many protective functions on metabolism and cardiovascular diseases. However, little is known about the effect of CTRP6 on DOX-induced cardiac injury. The present study aimed to investigate whether CTRP6 could protect against DOX-related cardiotoxicity. To induce acute cardiotoxicity, the mice were intraperitoneally injected with a single dose of DOX (15 mg/kg). Cardiomyocyte-specific CTRP6 overexpression was achieved using an adenoassociated virus system at 4 weeks before DOX injection. The data in our study demonstrated that CTRP6 messenger RNA and protein expression were decreased in DOX-treated hearts. CTRP6 attenuated cardiac atrophy induced by DOX injection and inhibited cardiac apoptosis and improved cardiac function in vivo. CTRP6 also promoted the activation of protein kinase B (AKT/PKB) signaling pathway in DOX-treated mice. CTRP6 prevented cardiomyocytes from DOX-induced apoptosis and activated the AKT pathway in vitro. CTRP6 lost its protection against DOX-induced cardiac injury in mice with AKT inhibition. In conclusion, CTRP6 protected the heart from DOX-cardiotoxicity and improves cardiac function via activation of the AKT signaling pathway.
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Adipoquinas/genética , Cardiotoxicidad/genética , Doxorrubicina/toxicidad , Lesiones Cardíacas/genética , Miocitos Cardíacos/efectos de los fármacos , Proteínas Proto-Oncogénicas c-akt/genética , Adipoquinas/metabolismo , Animales , Cardiotoxicidad/etiología , Cardiotoxicidad/fisiopatología , Cardiotoxicidad/prevención & control , Línea Celular , Cromonas/farmacología , Dependovirus/genética , Dependovirus/metabolismo , Regulación de la Expresión Génica , Vectores Genéticos/química , Vectores Genéticos/metabolismo , Pruebas de Función Cardíaca , Lesiones Cardíacas/inducido químicamente , Lesiones Cardíacas/fisiopatología , Lesiones Cardíacas/prevención & control , Masculino , Ratones , Ratones Endogámicos C57BL , Morfolinas/farmacología , Miocitos Cardíacos/citología , Miocitos Cardíacos/metabolismo , Proteínas Proto-Oncogénicas c-akt/antagonistas & inhibidores , Proteínas Proto-Oncogénicas c-akt/metabolismo , ARN Mensajero/genética , ARN Mensajero/metabolismo , Transducción de SeñalRESUMEN
Anisotropic materials, especially two-dimensional (2D) layered materials formed by van der Waals force (vdW) with low-symmetry, have become a scientific hot-spot because their electrical, optical, and thermoelectric properties are highly polarization dependent. The 2D GeSe, a typical anisotropic-layered orthorhombic structure and narrow bandgap (1.1-1.2 eV) semiconductor, potentially meets these demands. In this report, the ultrathin elongated hexagonal GeSe nanoplates were successfully synthesized by the rapid physical vapor deposition method developed here. The ultrathin elongated hexagonal GeSe nanoplates have a zigzag edge in the long edge and an armchair edge in the short edge. In addition, the typical Raman mode exhibited 90° periodic vibration, having its maximum intensity between the zigzag direction or the zigzag and armchair direction, indicating an anisotropic electron-phonon interaction. Furthermore, the field effect transistor devices based on the elongated hexagonal GeSe nanoplates were constructed and exhibited the p-type semiconducting behavior with a high photoresponse characteriscs. Finally, the polarized sensitive photocurrent was identified, further revealing the intrinsically anisotropy of the GeSe nanoplate. The results illustrated here may give a useful guidance to synthesize the 2D-layered anisotropic nanomaterials and further advance the development of the polarized photodetector.