Background: mTeSR1 is a fully-defined, serum-free medium for the derivation and maintenance of Human embryonic stem cells (ESCs). This study investigates the impact of incorporating mTeSR1 supplement during in vitro culture (IVC) on blastocyst productivity, qualitative characteristics, and outgrowth potential of bovine blastocysts. Methods: In vitro fertilized (IVF) eggs were cultured in IVC medium (control) with the addition of mTeSR1 supplement at concentrations of 1%, 2%, and 5%, respectively. The development rates of fertilized eggs and gene expression patterns of blastocysts were assessed on day 9 of culture. For outgrowth culture, blastocysts were cultured on a mouse embryonic fibroblast feeder cells (MEFs) for 7 days. Results: In vitro development of bovine preimplantation embryos in the 2% mTeSR1 group was significantly higher than in the control (p < 0.05). The apoptotic index in the 2% mTeSR1 group was significantly lower compared to the control (p < 0.05). RTqPCR indicated that SRY-Box Transcription Factor 2 (Sox2) gene expression in the 5% mTeSR1 group was significantly higher than in the control (p < 0.05). The 5% mTeSR1 group also showed significantly higher BCL2 associated X (Bax) expression compared to the control and other mTeSR1 groups. On day 9 pi, blastocysts from the control and 2% mTeSR1 groups were cultured for 7 days. The 2% mTeSR1 group showed higher efficiency in forming dome-shaped colonies with stronger SOX2 expression compared to the control. Conclusions: The mTeSR1 supplement supports preimplantation embryo development and prevents apoptosis in blastocysts, leading to the efficient formation of domeshaped inner cell mass (ICM) colonies.

본 연구는 베토벤 ≪피아노 소나타 no.15, op.28≫ 1악장의 발전부를 중심으로 주제적 구성의 양상을 살피고, 해당 발전부에 대한 해석으로서 ‘꿈과 현실의 내러티브’를 도입한다. 발전부를 세 영역으로 구분하고 각각을 현실에서 꿈속으로의 이동, 꿈속의 지속, 꿈속에서 현실로의 이동이라 는 구조로 파악한다. 이로써 전통적인 고전 소나타 형식에서 벗어난 발전부의 독특하고 모호한 음 악적 전개를 설명하는 하나의 가능성을 제시한다.

Foot-and-mouth disease (FMD), which affects cloven-hoofed animals, is economically important because of its highly contagious nature. FMD virus (FMDV), the causative agent of FMD, involves seven serotypes (O, A, Asia1, C, and SAT 1-3). Serotype Asia1 is unique to the Asian territory and is subdivided into nine genetic groups (G-I-IX) based on nucleotide variations in the VP1 sequence. Asia1 Shamir, the most representative Asia1 vaccine, is not highly protective against the Asia1/MOG/05 (G-V) lineage found in North Korea in 2007. Therefore, we investigated whether a chimeric virus strain (Asia1/MOG/Shamir), in which the VP4, VP2, and VP3 sequences of Asia1/MOG/05 were combined with the VP1 sequence of Asia1 Shamir, can simultaneously protect against both viruses. We determined the optimal viral growth conditions for the commercial utilization of this chimeric virus strain. Of the three types of cell culture media, the Cellvento medium resulted in the highest amount of antigen in the samples. The chimeric strain was proliferated in a small bioreactor to produce a test vaccine, and its immunogenicity was evaluated in pigs. The virus neutralization (VN) titer against the Asia1 Shamir virus was > 1/100 after the second immunization with the chimeric vaccine in pigs. In addition, a single dose of the test vaccine resulted in a VN titer of > 1/100 against the Asia1/MOG/05 strain. Taken together, our chimeric vaccine strain provided sufficient protection against the Asia1/MOG/05 and Asia1 Shamir viruses, suggesting its potential as a novel vaccine for both these strains.

Recently, unmanned logistics delivery systems, such as UAV (Unmanned Aerial Vehicle, written as drone below) and autonomous robot delivery systems, have been implemented in many countries due to the rapid development of autonomous driving technology. The development of these new types of advanced unmanned logistics delivery systems is essential not only to become a leading logistics company but also to secure national competitiveness. In this paper, the application of the unmanned logistics delivery system was investigated in terms of market trends, overall technology level of last mile delivery drone and autonomous delivery robot. The direction of response to changes in the last mile delivery service market was checked through a comparison of the technological level between domestic companies that produce last mile devices and advanced foreign companies. As a result of this technology level analysis, the difference between domestic companies and advanced companies was shown using tables and figures to show their relative levels. The results of this analysis reflect the opinions of experts in the field of last-mile delivery technology. In addition, the technology level of unmanned logistics delivery systems for each country was analyzed based on the number of related technology patents. Lastly, insights for the technology level analysis of unmanned last mile delivery systems were proposed as a conclusion.

Foot-and-mouth disease (FMD) is a highly contagious vesicular disease that affects cloven-hoofed animals, causing substantial economic losses to the livestock industry. The causative FMD virus (FMDV) comprises four structural proteins (VP1, VP2, VP3, and VP4) and several non-structural proteins. Among the capsid proteins, VP4 is the most conserved, making it an attractive target as a diagnostic and vaccine antigen, regardless of FMDV serotype. In this study, we attempted to express the VP4 protein N-terminally fused to a glutathione S-transferase (GST) tag in Escherichia coli. Whereas VP0 and VP2 proteins were expressed in the soluble fraction, we failed to detect VP4, even in the insoluble fraction. To investigate the effect of VP4 C-terminal amino acid residues on protein expression, we constructed three VP4 mutants fused to GST, among which the mutant in which the C-terminal 15 amino acid residues had been deleted showed the highest level of protein expression. Furthermore, protein expression was observed even in the mutant in which three amino acid residues (DKK) had been fused to the C terminus. However, unlike the other two mutants, the wild-type VP4 mutant was poorly expressed, thereby indicating that the C-terminal amino acid residues could play a pivotal role in determining expression of the VP4 protein in E. coli.