Manajemen Sumber Daya Manusia

Square planar silver(I) complexes: A rare but increasingly observed stereochemistry for silver(I)

Solvothermal reactions of Ca(NO3)2 or Ba(NO3)2 with aromatic carboxylate ligands afforded four new inorganic–organic hybrid frameworks, [Ca(PBDC)(H2O)3]n (1), [Ca(OBDC)(H2O)]n (2), [Ba5(OBDC)4(H2O)2(NO3)2]n (3), and [Ba3(BTC)2(H2O)4]n (4) (H2PBDC = terephthalic acid, H2OBDC = phthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid). These compounds have been fully characterized by single crystal X-ray diffraction, powder X-ray diffraction, satisfactory elemental analysis, IR spectra, and TG analysis. X-ray analysis shows that compound 1 features a one-dimensional chain (1D) structure with the I1O0 connectivity, both compound 2 and compound 3 feature a two-dimensional (2D) layer structure with the I1O1 connectivity, I2O0 connectivity, respectively, compound 4 features a three-dimensional (3D) framework with a rare I3O0 connectivity. Thermal stabilities and luminescent properties of compounds 1–4 and NLO property of compound 4 have also been investigated.

A Series of Ca(II) or Ba(II) Inorganic–Organic Hybrid Frameworks Based on Aromatic Polycarboxylate Ligands with the Inorganic M–O–M (M = Ca, Ba) Connectivity from 1D to 3D

Five new silver(I) complexes of formulas [Ag(Tpms)] (1), [Ag(Tpms)(PPh3)] (2), [Ag(Tpms)(PCy3)] (3), [Ag(PTA)][BF4] (4), and [Ag(Tpms)(PTA)] (5) {Tpms = tris(pyrazol-1-yl)methanesulfonate, PPh3 = triphenylphosphane, PCy3 = tricyclohexylphosphane, PTA = 1,3,5-triaza-7-phosphaadamantane} have been synthesized and fully characterized by elemental analyses, 1H, 13C, and 31P NMR, electrospray ionization mass spectrometry (ESI-MS), and IR spectroscopic techniques. The single crystal X-ray diffraction study of 3 shows the Tpms ligand acting in the N3-facially coordinating mode, while in 2 and 5 a N2O-coordination is found, with the SO3 group bonded to silver and a pendant free pyrazolyl ring. Features of the tilting in the coordinated pyrazolyl rings in these cases suggest that this inequivalence is related with the cone angles of the phosphanes. A detailed study of antimycobacterial and antiproliferative properties of all compounds has been carried out. They were screened for their in vitro antimicrobial activi...

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Synthesis, antimicrobial and antiproliferative activity of novel silver(I) tris(pyrazolyl)methanesulfonate and 1,3,5-triaza-7-phosphadamantane complexes.

New coordination polymers have been obtained by the self-assembly of silver salts AgX (X = BF4, PF6, CF3SO3) and 2,4-diamino-6-R-1,3,5-triazines L (R = phenyl and p-tolyl) of formulas AgLX (1−6). A complex of different stoichiometry, [Ag3L2(H2O)(acetone)2](BF4)3, 7 (R = phenyl), has also been synthesized. The three-dimensional structures of five compounds have been determined by X-ray diffraction studies. For the AgLX complexes, when X = BF4 and R = phenyl or p-tolyl, chiral chains with alternating Ag and L are formed. The chains are cross-linked by the counteranions in a three-dimensional fashion through hydrogen bonds and weak Ag···F interactions giving rise to a structure with solvent-filled channels. Different and more compact structures have been found when the counteranion is CF3SO3 (OTf). When R = phenyl, sheets are formed which consist of [Ag2(OTf)2L2] units with double triflate bridges and which contain columns of π−π stacked arenes. Hydrogen bonds connect the sheets. When AgOTf is used and R is ...

Anion-dependent self-assembly of silver(I) and diaminotriazines to coordination polymers: non-covalent bonds and role interchange between silver and hydrogen bonds.

Syntheses, structures and vibrational spectroscopy of some 1:1 and 1:2 adducts of silver(I) oxyanion salts with 2,2'-bis(pyridine) chelates

The coronavirus disease 2019 (COVID-19) pandemic is still ongoing, with no signs of abatement in sight. The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the causative agent of this pandemic and has claimed over 5 million lives, is still mutating, resulting in numerous variants. One of the newest variants is Omicron, which shows an increase in its transmissibility, but also reportedly reduces hospitalization rates and shows milder symptoms, such as in those who have been vaccinated. As a result, many believe that Omicron provides a natural vaccination, which is the first step toward ending the COVID-19 pandemic. Based on published research and scientific evidence, we review and discuss how the end of this pandemic is predicted to occur as a result of Omicron variants being surpassed in the community. In light of the findings of our research, we believe that it is most likely true that the Omicron variant is a natural way of vaccinating the masses and slowing the spread of this deadly pandemic. While the mutation that causes the Omicron variant is encouraging, subsequent mutations do not guarantee that the disease it causes will be less severe. As the virus continues to evolve, humans must constantly adapt by increasing their immunity through vaccination.

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Can the SARS-CoV-2 Omicron Variant Confer Natural Immunity against COVID-19?

Synthesis of Methyl Ester from Chicken Oil and Methanol Using Heterogeneous Catalyst of CaO-MgO as well as Characterization Its Potential as a Biodiesel Fuel

This study aimed to compare the students' motivation that learned by two different methods viewed from prior knowledge. This study used the quasi-experimental design. Data were obtained from motivation questionnaire which consist of 31 point statements. Data were analyzed using two ways ANOVA. The results showed that: (1) there was differences in students' motivation that learned with hands-on and demonstration in guided inquiry learning, (2) student with high prior knowledge have better motivation in learning rather than students with low prior knowledge, (3) there was no interaction between learning methods and prior knowledge on students' motivation. Penelitian ini bertujuan untuk mengetahui perbedaan motivasi belajar siswa yang dibelajarkan dengan 2 metode berbeda ditinjau dari kemampuan awal. Penelitian ini menggunakan rancangan eksperimen semu. Data penelitian diperoleh dari angket motivasi yang terdiri atas 31 butir pernyataan. Data dianalisis menggunakan ANOVA dua jalan. Hasil penelitian menunjukkan bahwa: (1) ada perbedaan motivasi belajar siswa yang dibelajarkan dengan praktikum dan demonstrasi dalam pembelajaran inkuiri terbimbing, (2) siswa dengan kemampuan awal tinggi memiliki motivasi belajar yang lebih baik dibandingkan siswa dengan kemampuan awal rendah, (3) tidak ada interaksi antara metode pembelajaran dan kemampuan awal terhadap motivasi belajar siswa.

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Pengaruh praktikum dan demonstrasi dalam pembelajaran inkuiri terbimbing terhadap motivasi belajar siswa pada materi asam basa ditinjau dari kemampuan awal

The covid-19 pandemic period has not yet passed. Learning activities are carried out online or through distance learning. Distance learning requires teachers to assign tasks to children to keep learning from home every day. This research aims to see how assignment approaches affect the development of religious and moral values in early childhood in IT ADAR PAUD institutions during the Covid-19 pandemic. This study examines the significance test between the independent variables of the assignment system and the dependent variable of early childhood religious and moral values using quantitative correlation research of product-moment through the t-test. The significance value of 0.753 is greater than 0.05, as shown by the t-test. As a result, it can be inferred that the assignment process has an effect on facets of religious and moral values formation in early childhood during the Covid-19 pandemic period. It is expected that educators in the pandemic period will continue to use the assignment method to ensure that facets of children's religious and moral beliefs evolve with time.

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Siti Marfuah

Papers

Syntheses, structures and vibrational spectroscopy of some 1:1 and 1:2 adducts of silver(I) oxyanion salts with 2,2'-bis(pyridine) chelates

Can the SARS-CoV-2 Omicron Variant Confer Natural Immunity against COVID-19?

Synthesis of Methyl Ester from Chicken Oil and Methanol Using Heterogeneous Catalyst of CaO-MgO as well as Characterization Its Potential as a Biodiesel Fuel

Pengaruh praktikum dan demonstrasi dalam pembelajaran inkuiri terbimbing terhadap motivasi belajar siswa pada materi asam basa ditinjau dari kemampuan awal

The influence of assignment methods on the development aspects of religious and moral values of early childhood during the covid-19 pandemic