This paper studies the influence of the variable nonlocal parameter and porosity on the free vibration behavior of the functionally graded nanoplates with porosity. Four patterns of distribution of the porosity through the thickness direction are considered. The classical nonlocal elasticity theory is modified to take into account the variation of the nonlocal parameter through the thickness of the nanoplates. The governing equations of motion are established using simple first-order shear deformation theory and Hamilton’s principle. The closed-form solution based on Navier’s technique is employed to solve the governing equations of motion of fully simply supported nanoplates. The accuracy of the present algorithm is proved via some comparison studies in some special cases. Then, the effects of the porosity, the variation of the nonlocal parameter, the power-law index, aspect ratio, and the side-to-thickness ratio on the free vibration of nanoscale porous plates are investigated carefully. The numerical results show that the porosity and nonlocal parameter have strong effects on the free vibration behavior of the nanoplates.
Nghiên cứu nhằm khám phá các nhân tố tác động đến việc thu hút vốn đầu tư vào tỉnh Cà Mau, tác động đến việc quyết định chọn Cà Mau là nơi đầu tư của các nhà đầu tư. Mẫu khảo sát bao gồm 335 nhà đầu tư trong và ngoài nước đã và đang đầu tư tại tỉnh Cà Mau. Kết quả cho thấy có 7 nhóm nhân tố tác động đến việc thu hút vốn đầu tư vào tỉnh Cà Mau: Kết quả nghiên cứu tìm ra các yếu tố tác động đến thu hút vốn đầu tư vào khu vực nông – lâm nghiệp – thủy sản của Cà Mau là: Quyết định của chính quyền địa phương và các hỗ trợ, Thị trường, Vị trí địa lý và tài nguyên thủy sản. Các yếu tố tác động đến thu hút vốn đầu tư vào khu vực công nghiệp – xây dựng của Cà Mau gồm: Quyết định của chính quyền địa phương, Chính sách đầu tư và công tác hỗ trợ, Thị trường. Các yếu tố thị trường, Chi phí đầu tư, Đối tác tin cậy, Vị trí thuận lợi cho hoạt động kho bãi, các khu kinh tế tác động đến thu hút vốn đầu tư vào khu vực thương mại – dịch vụ.
Hairy root induction system has been widely applied for studies of gene function, gene expression, and genome editing in numerous plant species. In this study, we developed and evaluated the performance of an in vitro hairy root induction system via Agrobacterium rhizogenes on several Vietnamese and international soybean cultivars. The efficacy of in vitro hairy root induction and of transformation using this system was varied and depended on soybean cultivars as well as transgenic constructs. The hairy root induction frequency of different soybean cultivars ranged from 61.67% to 100% after 5 days on culture medium. From 43.8% to 79.8% of hairy roots transformed with GFP-expressing construct showed transgene expression, while that for the construct with the gus gene was from 38.07% to 72.33%. Among tested soybean cultivars, DT26 demonstrated the highest transformation and gene expression efficacy with both investigated vectors. This hairy root induction system was further utilized for targeted knockout mutagenesis via CRISPR/Cas9 of two genes which are G03 and G09 in the DT26 soybean cultivar. Successful mutagenesis in the regions of targeted genes was confirmed by shifted and multiple bands compared to which of non-transgenic hairy root in PAGE analysis. Sequencing results of targeted regions presented various nucleotide deletions ranging between -3 bp and -25 bp in size in both two genes of interest. This study laid an important basis for future gene function studies and targeted gene editing investigations on soybean plants in Vietnam.
Endophytic fungi, microfungi that internally infect living plant tissues, are reported to have the ability to synthesize many enzymes, plant growth hormones and pharmaceutically active compounds similar to those in their hosted plants. This has opened a potential path of using endophytic fungi as a bioreactor for mass production of bioactive compounds at a lower cost. Therefore, it is necessary to establish a robust procedure for the isolation and identification of potential fungal strains that are capable of producing desired biological compounds. In this study, we reported an effective procedure for surface sterilization of 3 types of tissue samples (root, shoot and leaf) of 2 herbaceous plants (Catharanthus roseus and Scutallaria barbata) using commercial bleach (5% NaOCl), isolation of endophytic fungi from the sterilized samples and identification of isolated fungal strains by ITS sequencing analysis. A total of 48 endophytic fungi were successfully isolated from plant samples collected from Dan Phuong (Ha Noi), Phu Dien (Ha Noi) and Hai Duong city (Hai Duong). Based on results of morphological observation and ITS sequencing analysis, 48 endophytic fungi were classified to one of the four species, including Clasdosporium colombiae, Cladosporium halotolerans, Corynespora cassiicola and Albifimbria terrestris. The potential of the isolated endophytic fungal species for the mass production of pharmacologically active compounds will be investigated in future studies.
The 3C-SiC nanorods were grown by using carbothermal reduction of SiO2 without any catalyst. The intensive broad photoluminescence peak around 480-500 nm was observed at room temperature. The 3C-SiC nanorods with green-blue emitting light may have great application in display devices and light emitting diodes.
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