Hydrophilic ZnS nanocrystals with narrow size distribution were synthesized via homogeneous precipita- tion using EDTA as stabilizer. The as-synthesized products were characterized with XRD, TEM, HRTEM and UV-Vis ...Hydrophilic ZnS nanocrystals with narrow size distribution were synthesized via homogeneous precipita- tion using EDTA as stabilizer. The as-synthesized products were characterized with XRD, TEM, HRTEM and UV-Vis spectrum. UV-Vis spectra showed that ZnS nanocrystals exhibited strong quantum-confined effect with a blue shift in the band gap of light absorbance. The photocatalytic activity of these nanocrystals was also investigated for the liquid phase photocatalytic degradation of Basic Violet 5BN (BV5) dye under UV irradiation. It was found that the ZnS nanocrystals had good catalytic activity for photodegradation of BV5.展开更多
Dear Editor,Coronaviruses have increasingly become the causal agent of epidemics in humans as well as in domesticated animals(Perlman and Mc Intosh,2020;Wu et al.,2021).Since the beginning of this century,there have b...Dear Editor,Coronaviruses have increasingly become the causal agent of epidemics in humans as well as in domesticated animals(Perlman and Mc Intosh,2020;Wu et al.,2021).Since the beginning of this century,there have been 3 such epidemics.展开更多
OBJECTIVE To identify genes related to gastric cancer and to analyze their expression profiles in different gastric tissues. METHODS The differentially expressed cDNA bands were assayed by fluorescent differential dis...OBJECTIVE To identify genes related to gastric cancer and to analyze their expression profiles in different gastric tissues. METHODS The differentially expressed cDNA bands were assayed by fluorescent differential display from gastric cancer specimens, matched with normal gastric mucosa and premalignant lesions. The motility-related protein-1 (MRP-1/CD9) gene expression was studied by Northern blots and reverse transcription polymerase chain reaction (RT-PCR) in different kinds of gastric tissue. RESULTS A differentially expressed cDNA fragment showed lower expression in all gastric cancers compared to the normal gastric mucosa and premalignant lesions; and it was found to be homologous to the MRP-1/CD9 gene. Northern blot analysis confirmed the differential expression. RT-PCR analysis showed that the MRP-1/CD9 gene was expressed at a much lower rate in gastric cancers (0.31 +0.18) compared to the matched normal gastric tissue (0.49+0.24) and premalignant lesions (0.47+0.18)(P<0.05). Furthermore, its expression in intestinal-type of gastric cancer (0.38+0.16) was higher than that expressed in a diffuse-type of gastric cancer (0.22±0.17)(P<0.05). CCONCLUSION The MRP-1/CD9 gene expression was down-regulated in gastric cancer and its expression may be related to the carcinogenic process and histological type of gastric cancer.展开更多
High-entropy ceramics(HECs)have shown great application potential under demanding conditions,such as high stresses and temperatures.However,the immense phase space poses great challenges for the rational design of new...High-entropy ceramics(HECs)have shown great application potential under demanding conditions,such as high stresses and temperatures.However,the immense phase space poses great challenges for the rational design of new high-performance HECs.In this work,we develop machine-learning(ML)models to discover high-entropy ceramic carbides(HECCs).Built upon attributes of HECCs and their constituent precursors,our ML models demonstrate a high prediction accuracy(0.982).Using the well-trained ML models,we evaluate the single-phase probability of 90 HECCs that are not experimentally reported so far.Several of these predictions are validated by our experiments.We further establish the phase diagrams for non-equiatomic HECCs spanning the whole composition space by which the single-phase regime can be easily identified.Our ML models can predict both equiatomic and non-equiatomic HECs based solely on the chemical descriptors of constituent transition-metal-carbide precursors,which paves the way for the high-throughput design of HECCs with superior properties.展开更多
文摘Hydrophilic ZnS nanocrystals with narrow size distribution were synthesized via homogeneous precipita- tion using EDTA as stabilizer. The as-synthesized products were characterized with XRD, TEM, HRTEM and UV-Vis spectrum. UV-Vis spectra showed that ZnS nanocrystals exhibited strong quantum-confined effect with a blue shift in the band gap of light absorbance. The photocatalytic activity of these nanocrystals was also investigated for the liquid phase photocatalytic degradation of Basic Violet 5BN (BV5) dye under UV irradiation. It was found that the ZnS nanocrystals had good catalytic activity for photodegradation of BV5.
基金supported by the National Natural Science Foundation of China(81802939,32150006,31730046,and 81972691)the National Key Research and Development Projects of the Ministry of Science and Technology of China(2021YFC2301300)+4 种基金the National Key Research and Development Program of China(2021YFC0863400)Guangdong Basic and Applied Basic Research Foundation(2020B1515020030)the National Key Research and Development Project(2020YFC0847000)the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(ZhuhaiNo.311021006)。
文摘Dear Editor,Coronaviruses have increasingly become the causal agent of epidemics in humans as well as in domesticated animals(Perlman and Mc Intosh,2020;Wu et al.,2021).Since the beginning of this century,there have been 3 such epidemics.
文摘OBJECTIVE To identify genes related to gastric cancer and to analyze their expression profiles in different gastric tissues. METHODS The differentially expressed cDNA bands were assayed by fluorescent differential display from gastric cancer specimens, matched with normal gastric mucosa and premalignant lesions. The motility-related protein-1 (MRP-1/CD9) gene expression was studied by Northern blots and reverse transcription polymerase chain reaction (RT-PCR) in different kinds of gastric tissue. RESULTS A differentially expressed cDNA fragment showed lower expression in all gastric cancers compared to the normal gastric mucosa and premalignant lesions; and it was found to be homologous to the MRP-1/CD9 gene. Northern blot analysis confirmed the differential expression. RT-PCR analysis showed that the MRP-1/CD9 gene was expressed at a much lower rate in gastric cancers (0.31 +0.18) compared to the matched normal gastric tissue (0.49+0.24) and premalignant lesions (0.47+0.18)(P<0.05). Furthermore, its expression in intestinal-type of gastric cancer (0.38+0.16) was higher than that expressed in a diffuse-type of gastric cancer (0.22±0.17)(P<0.05). CCONCLUSION The MRP-1/CD9 gene expression was down-regulated in gastric cancer and its expression may be related to the carcinogenic process and histological type of gastric cancer.
基金This work was supported by the Research Grants Council of Hong Kong(Nos.11200421 and 21200919)Shenzhen Basic Research Program(No.JCYJ20190808181601662)+1 种基金City University of Hong Kong(No.9610425)Z.Wu acknowledges the financial support from the National Natural Science Foundation of China(51901077).
文摘High-entropy ceramics(HECs)have shown great application potential under demanding conditions,such as high stresses and temperatures.However,the immense phase space poses great challenges for the rational design of new high-performance HECs.In this work,we develop machine-learning(ML)models to discover high-entropy ceramic carbides(HECCs).Built upon attributes of HECCs and their constituent precursors,our ML models demonstrate a high prediction accuracy(0.982).Using the well-trained ML models,we evaluate the single-phase probability of 90 HECCs that are not experimentally reported so far.Several of these predictions are validated by our experiments.We further establish the phase diagrams for non-equiatomic HECCs spanning the whole composition space by which the single-phase regime can be easily identified.Our ML models can predict both equiatomic and non-equiatomic HECs based solely on the chemical descriptors of constituent transition-metal-carbide precursors,which paves the way for the high-throughput design of HECCs with superior properties.
