Microblogging Sentiment Investor, Return and Volatility in the COVID-19 Era: Indonesian Stock Exchange

FARISKA, Putri,NUGRAHA, Nugraha,PUTERA, Ika,ROHANDI, Mochamad Malik Akbar,FARISKA, Putri Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3

The covid-19 pandemic scenario caused the most extensive economic shocks the world has experienced in decades. Maintaining financial performance and economic stability is essential during the pandemic period. In these conditions, where movement is severely restricted, media consumption is considered to be increasing. The social media platform is one of the media online used by the public as a source of information and also expressing their sentiment, including individual investors in the capital market as social media users. Twitter is one of the social media microblogging platforms used by individual investors to share their opinion and get information. This study aims to determine whether microblogging sentiment investors can predict the capital market during pandemics. To analyze microblogging sentiment investors, we classified sentiment using the phyton text mining algorithm and Naïve Bayesian text classification into level positive, negative, and neutral from November 2019 to November 2020. This study was on 68 listed companies on the Indonesia stock exchange. A Vector Autoregression and Impulse Response is applied to capture short and long-term impacts along with a causal relationship. We found that microblogging sentiment investor has a significant impact on stock returns and volatility and vice-versa. Also, the response due to shocks is convergent, and microblogging investors in Indonesia are categorized as a "news-watcher" investor.

Combination of Potassium Pentagamavunon-0 and Doxorubicin Induces Apoptosis and Cell Cycle Arrest and Inhibits Metastasis in Breast Cancer Cells

Putri, Herwandhani,Jenie, Riris Istighfari,Handayani, Sri,Kastian, Ria Fajarwati,Meiyanto, Edy Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5

A salt compound of a curcumin analogue, potassium pentagamavunon-0 (K PGV-0) has been synthesized to improve solubility of pentagamavunon-0 which has been proven to have anti-proliferative effects on several cancer cells. The purpose of this study was to investigate cytotoxic activity and metastasis inhibition by K PGV-0 alone and in combination with achemotherapeutic agent, doxorubicin (dox), in breast cancer cells. Based on MTT assay analysis, K PGV-0 showed cytotoxic activity in T47D and 4T1 cell lines with $IC_{50}$ values of $94.9{\mu}M$ and $49.0{\pm}0.2{\mu}M$, respectively. In general, K PGV-0+dox demonstrated synergistic effects and decreased cell viability up to 84.7% in T47D cells and 62.6% in 4T1 cells. Cell cycle modulation and apoptosis induction were examined by flow cytometry. K PGV-0 and K PGV-0+dox caused cell accumulation in G2/M phase and apoptosis induction. Regarding cancer metastasis, while K PGV-0 alone did not show any inhibition of 4T1 cell migration, K PGV-0+dox exerted inhibition. K PGV-0 and its combination with dox inhibited the activity of MMP-9 which has a pivotal role in extracellular matrix degradation. These results show that a combination of K PGV-0 and doxorubicin inhibits cancer cell growth through cell cycling, apoptosis induction, and inhibition of cell migration and MMP-9 activity. Therefore, K PGV-0 may have potential for development as a co-chemotherapeutic agent.

Possibilities of Liquid Chromatography Mass Spectrometry (LC-MS)-Based Metabolomics and Lipidomics in the Authentication of Meat Products: A Mini Review

Putri Widyanti Harlina,Vevi Maritha,Ida Musfiroh,Syamsul Huda,Nandi Sukri,Muchtaridi Muchtaridi 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.5

The liquid chromatography mass spectrometry (LC-MS)-based metabolomic and lipidomic methodology has great sensitivity and can describe the fingerprint of metabolites and lipids in pork and beef. This approach is commonly used to identify and characterize small molecules such as metabolites and lipids, in meat products with high accuracy. Since the metabolites and lipids can be used as markers for many properties of a food, they can provide further evidence of the foods authenticity claim. Chromatography coupled to mass spectrometry is used to separate lipids and metabolites from meat samples. The research data usually is compared to lipid and metabolite databases and evaluated using multivariate statistics. LC-MS instruments directly connected to the metabolite and lipid databases software can be used to assess the authenticity of meat products. LC-MS has good selectivity and sensitivity for metabolomic and lipidomic analysis. This review highlighted the combination of metabolomics and lipidomics can be used as a reference for analyzing authentication meat products.

$MgB_2$ Thin Films on SiC Buffer Layers with Enhanced Critical Current Density at High Magnetic Fields

Putri, W.B.K.,Tran, D.H.,Kang, B.,Lee, N.H.,Kang, W.N. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.14 No.1

We have grown $MgB_2$ superconducting thin films on the SiC buffer layers by means of hybrid physical-chemical vapor deposition (HPCVD) technique. Prior to that, SiC was first deposited on $Al_2O_3$ substrates at various temperatures from room temperature to $600^{\circ}C$ by using the pulsed laser deposition (PLD) method in a vacuum atmosphere of ${\sim}10^{-6}$ Torr pressure. All samples showed a high transition temperature of ~40 K. The grain boundaries of $MgB_2$ samples with SiC layer are greater in amount, compare to that of the pure $MgB_2$ samples. $MgB_2$ with SiC buffer layer samples show interesting change in the critical current density ($J_c$) values. Generally, at both 5 K and 20 K measurements, at lower magnetic field, all $MgB_2$ films deposited on SiC buffer layers have low $J_c$ values, but when they reach higher magnetic fields of nearly 3.5 Tesla, $J_c$ values are enhanced. $MgB_2$ film with SiC grown at $600^{\circ}C$ has the highest $J_c$ enhancement at higher magnetic fields, while all SiC buffer layer samples exhibit higher $J_c$ values than that of the pure $MgB_2$ films. A change in the grain boundary morphologies of $MgB_2$ films due to SiC buffer layer seems to be responsible for $J_c$ enhancements at high magnetic fields.

Predisposing, Enabling, and Reinforcing Factors of COVID-19 Prevention Behavior in Indonesia: A Mixed-methods Study

Putri Winda Lestari,Lina Agestika,Gusti Kumala Dewi 대한예방의학회 2023 예방의학회지 Vol.56 No.1

Objectives: To prevent the spread of coronavirus disease 2019 (COVID-19), behaviors such as mask-wearing, social distancing, decreasing mobility, and avoiding crowds have been suggested, especially in high-risk countries such as Indonesia. Unfortunately, the level of compliance with those practices has been low. This study was conducted to determine the predisposing, enabling, and reinforcing factors of COVID-19 prevention behavior in Indonesia. Methods: This cross-sectional study used a mixed-methods approach. The participants were 264 adults from 21 provinces in Indonesia recruited through convenience sampling. Data were collected using a Google Form and in-depth interviews. Statistical analysis included univariate, bivariate, and multivariate logistic regression. Furthermore, qualitative data analysis was done through content analysis and qualitative data management using Atlas.ti software. Results: Overall, 44.32% of respondents were non-compliant with recommended COVID-19 prevention behaviors. In multivariate logistic regression analysis, low-to-medium education level, poor attitude, insufficient involvement of leaders, and insufficient regulation were also associated with decreased community compliance. Based on in-depth interviews with informants, the negligence of the Indonesian government in the initial stages of the COVID-19 pandemic may have contributed to the unpreparedness of the community to face the pandemic, as people were not aware of the importance of preventive practices. Conclusions: Education level is not the only factor influencing community compliance with recommended COVID-19 prevention behaviors. Changing attitudes through health promotion to increase public awareness and encouraging voluntary community participation through active risk communication are necessary. Regulations and role leaders are also required to improve COVID-19 prevention behavior.

Effect of Rosemary Extract on Lipid Oxidation, Fatty Acid Composition, Antioxidant Capacity, and Volatile Compounds of Salted Duck Eggs

Putri Widyanti Harlina,Meihu Ma,Raheel Shahzad,Ibrahim Khalifa 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.4

The purpose of our study was to determine the impact of rosemary extract in duck eggs, as determined by in vitro antioxidant capacity, lipid oxidation, fatty acid profiles, and flavor analyses. Three groups of salted duck eggs were compared: A control group and group enriched with 0.1% and 0.5% (w/v) rosemary extracts for 28 days of salting. In a time-dependent manner, the radical scavenging activity and reduction power of eggs with 0.5% (w/v) rosemary extract were significantly higher those of the control at 28 days after salting. The fatty acid profiles of salted egg were significantly affected by rosemary extract and salting time. Palmitic acid was the most abundant fatty acid in salted egg treated with rosemary extract, followed by linoleic acid and arachidonic acid. Furthermore, the treated eggs contained more docosahexaenoic acid than the control ones. And the treated eggs also have a considerable impact on the lipid oxidation process (primary and secondary oxidation). As a result, rosemary extract can be used as a natural antioxidant spice to prevent oxidation and extend the shelf life of eggs during storage. Furthermore, flavor research using solid phase microextraction - gas chromatography - mass spectrometry and an electronic nose demonstrated that adding rosemary extract to salted eggs could give them a distinct flavor.

Patent Systems in Facing the Occurrence of Same Date Filing Identical Patent Application by Two Applicants

( Putri Andini ),( Noviar Hana ),( Park Hyunkyung ) 연세법학회(구 연세법학연구회) 2017 연세법학 Vol.29 No.-

이 논문의 목적은 동일한 날짜에 동일 유사한 특허를 출원하고자 하는 출원인이 2인 이상 있는 경우에 관한 것이다. 만약 각국의 특허법이 적절한 해결책을 규정하지 않는다면, 두 명 이상의 출원자간에 누가 특허출원인의 지위를 갖게 될 것인가에 관한 법적 문제가 발생할 수 있다. 이 문제를 해결하기 위한 두 가지 입법태도가 있는데, 그것이 선출원주의와 선발명주의이다. 선출원주의는 인도네시아를 비롯하여 한국, 일본 등의 취하고 있는 태도이며, 동일 날짜에 동일 유사한 특허의 출원이 있는 경우, 양자는 협의를 통해 일정기간 내에 출원인을 지정할 수 있도록 하고 있다. 한편, 미국은 선발명자 출원주의와 같은 행정절차를 수반하는 선발명주의가 실시되었다. 이 논문은 동일 유사한 발명에 대하여, 동일일자 출원인들 간의 출원인으로서의 지위를 정하는 기존의 날짜 중심의 해결방법의 문제점을 지적하고, 이를 극복하기 위한 방법으로서 시간에 기반한 선출원주의의 정립 필요성에 대하여 논의한다. 시간에 기반한 선출원주의의 운영은 선출원주의제도의 취지에 더욱 적합할 뿐 만 아니라, 인도네시아와 같이 국내에서 시차가 존재하는 경우 형평성의 입장에서도 타당하다고 생각한다. 더불어 제도의 합리적 운영을 위하여 이를 뒷받침할 수 있는 기술적 인프라의 구축도 뒤따라야 한다고 생각한다. The aim of this paper is to address the occurrence of two applicants apply an identical patent on the same date. This circumstance might cause a legal problem concerning who will get the patent between two applicants if there are no proper solutions given in several countries` patent Acts. A question arises Between two systems which are First-to-Invent and First-to-File, in case in which two or more applicants submit patent applications claiming the same or substantially similar subject matter close in time or on the same day. First-to-File system, which based on the earliest effective filing date on patent application, provisions embedded in Indonesia, South Korea and Japan`s Patent Acts are giving the chance to both applicants to enter into negotiation with specified period of time, except European Countries. Meanwhile, First-to-Invent system giving solution with its administrative proceeding, for example United States with its First-Inventor-to-File system. Country`s patent office, which use First-to-File system, can undergo time preference in order to overcome the issue. Time preference instead of date preference means in using First-to-File principle, the patent office of a country is basing the filing application of every application on the time base and also changing the basis from date standard to time standard. Therefore, when two applicants or more file applications on the same date, whoever files it earlier on the time base will be granted the patent. In order to strengthen this new approach, several things have to be taken into account which are the technological infrastructure as a supporting variable and also the time differences which exist in a country that makes one country is having several different time bases.

Fluorinated benzothiadiazole-based small molecules for photovoltaic applications

Putri, Sella Kurnia,Lee, Min Seok,Chang, Dong Wook,Kim, Joo Hyun Elsevier 2016 Synthetic metals Vol.220 No.-

<P><B>Abstract</B></P> <P>A series of medium band gap conjugated small molecules with a typical D-π-A-π-D structure, in which triphenylamine, thiophene, and benzothiadiazole are used as an electron-donor, a bridge, and an electron-acceptor, respectively, have been synthesized. To investigate the effects of strong electron-withdrawing fluorine atoms on various properties, one and two fluorine substituents are introduced to the central benzothiadiazole unit of N-(4-(5-(7-(5-(4-(diphenylamino)phenyl)thiophen-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)phenyl)-N-phenylbenzenamine (<B>TPA-TBT</B>) to give <B>TPA-TBT-1F</B> and <B>TPA-TBT-2F</B>, respectively. Owing to the significant contributions of fluorine atoms, these small molecules exhibit clearly distinctive optical and electrochemical properties. Inverted-type organic photovoltaic cells (OPVs) with a configuration of ITO/ZnO/small molecules: PC<SUB>71</SUB>BM/MoO<SUB>3</SUB>/Al were fabricated and the fabricated cells showed maximum power conversion efficiencies of 0.84, 1.15 and 1.70% for <B>TPA-TBT</B>, <B>TPA-TBT-1F</B> and <B>TPA-TBT-2F</B>, respectively. The superior photovoltaic performance of <B>TPA-TBT-2F</B> is attributed to the relatively deep energy level of highest occupied molecular orbital (HOMO) and to more balanced electron- and hole-mobility within photoconversion layer. Therefore, this study can provide insights into the tuning the properties of benzothiadiazole-based small molecules by introducing fluorine substituents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A series of medium band gap conjugated small molecules have been synthesized. </LI> <LI> Selective incorporation of fluorine atoms on the benzothiadiazole acceptors. </LI> <LI> Optical, electrochemical and photovoltaic properties have been investigated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Tissue culture of gerunggang (Cratoxylum arborescens (Vahl) Blume): multipurpose native species of Indonesian peatland

Putri Asri Insiana,Kartikawati Noor Khomsah,Nirsatmanto Arif,Sunarti Sri,Haryjanto Liliek,Herawan Toni,Santosa Purwanto Budi,Wahyuningtyas Reni Setyo,Lestari Fajar,Rimbawanto Anto 한국산림과학회 2023 Forest Science And Technology Vol.19 No.3

Gerunggang (Cratoxylum arborescens (Vahl) Blume) is a tree native to Indonesian peatlands that has great potential as an alternative fiber-producing species for the pulp and paper industry because it is adaptable and does not have the potential to disrupt local ecosystems. The species also contains important anti-cancer compounds for the pharmaceutical industry. These industries require large quantities of raw materials to meet their needs, which cannot be met by the supply of conventional plant seedlings. Tissue culture is one of the propaga- tion biotechnologies that can be used as an alternative to provide more efficient germplasm. In this study, we developed a protocol for gerunggang propagation using tissue culture technique. The results showed that the combination of 1 mg/l 6-benzylamino purine (BAP) and 0.5 mg/l naphthalene acetic acid (NAA) in Murashige & Skoog media provided the fast- est bud break time (2 weeks before the first subculture), with the highest shoot initiation (3.0 ± 0.2 cm), and after 4 weeks of incubation, the highest auxiliary shoot elongation (7.4 ± 0.1 cm). The significant effect of this hormone concentration also increases the nodule multiplication coefficient (NMC), which is 7.5. In vitro root response on the same propagation medium showed good growth with an average root length of 4.8 ± 0.2 cm. Acclimatization of plantlets was successful under ex vitro conditions and resulted in good growth after 2 and 3 months in the greenhouse. The advantage of applying the tissue culture method to gerunggang is that it can produce about seven times more seedlings from one explant in about 4 weeks. These results will be very useful for further research in the field and require a more intensive and comprehensive study.

Superconducting properties of SiC-buffered-MgB₂ tapes

Putri, W.B.K.,Kang, B.,Duong, P.V.,Kang, W.N. The Korea Institute of Applied Superconductivity a 2015 한국초전도저온공학회논문지 Vol.17 No.3

Production of $MgB_2$ film on metallic Hastelloy with SiC as the buffer layer was achieved by means of hybrid physical-chemical vapor deposition technique, whereas SiC buffer layers with varied thickness of 170 and 250 nm were fabricated inside a pulsed laser deposition chamber. Superconducting transition temperature and critical current density were verified by transport and magnetic measurement, respectively. With SiC buffer layer, the reduced delaminated area at the interface of $MgB_2$-Hastelloy and the slightly increased $T_c$ of $MgB_2$ tapes were clearly noticed. It was found that the upper critical field, the irreversibility field and the critical current density were reduced when $MgB_2$ tapes were buffered with SiC buffer layer. Clarifying the mechanism of SiC buffer layer in $MgB_2$ tape in affecting the superconducting properties is considerably important for practical applications.