bluuebunny/crossref_metadata_2025 huggingface dataset:
Motivating Emloyees in Public Administration
Authors: Borowski Andrzej
Published: May 2021

The purpose of the publication is to present the specifics of motivating in public administration. There is no doubt that employees should be motivated regardless of the workplace. The publication presents the definition of motivation and its theory. It contains tips on what should be particularly considered in creating an incentive system in public administration. Particular attention was devoted to creating the foundations of a motivational system that has roots in motivation theories. The most common motivational theories and their importance in shaping the incentive system were presented.
University Business English Courses Revisited
Authors: Lázár Viktória
Published: May 2021

The unexpected transition from in-person to online teaching in the spring of 2020 took university language instructors off guard. The objective of my research is to show that adapting to the new-normal (i.e. unplanned shift to online teaching) had a ripple effect on teaching methods, learning goals, student motivation. The setting of the research is a Business English course at a university in Budapest (Hungary). The autoetnographic research I carried out provides personal reflections both on the objective elements of the course: needs, learning objectives, teaching material and methods and evaluation, and on the affective elements: student motivation and emotions. The findings show that adverse circumstances can force teachers and students not only to set more realistic learning goals, focusing on the most relevant and important materials, but by keeping standards high, to find a new form of motivation.
Zarządzanie talentami jako integralny składnik kultury organizacyjnej firmy
Authors: Andrzejewski Marek
Published: May 2021

The uncertainty and complexity of the external environment, especially competitive, makes talent management is a necessity, but also a challenge. It requires a commitment primarily senior management. In order to attract and retain talent in the company it is necessary to develop a talented workforce management strategy, which should be due to the company's strategy. Talent management can become a distinguishing feature of the company, provided that it will ensure the effectiveness of the process. To get it to be true not only to attract talent, but also to ensure that the conditions for the systematic development and improvement. Cultural aspects have a very large impact on the implementation of projects in the field of talent management. The problem of adaptation to the existing talent organizational culture may create the feeling of a lack of job satisfaction and lead to frustration. Hence it is important to match the two variables: the psychological characteristics of the employee and the "personality" of the company. Companies should take appropriate protective measures at the stage of acquiring talent. In the process of recruiting talent is worth checking whether the employee will be able to fit into the existing organizational culture and values of the company are close to him, and whether its objectives aligned with the organization's objectives.
Specyfika relacji w ramach leasingu pracowniczego w strukturze grupy kapitałowej
Authors: Bąk-Grabowska Dominika
Published: May 2021

In the paper an employee leasing has been shown in the light of chosen labour market theories and management conceptions. The conducted analysis indicated that an employee leasing – as an institution of Labour Market Intermediaries (LMIs) – is presented as a nonstandard form of employment which is connected with a little attractive work and with low standards of human resources management. The analyzed case study of employee leasing usage in the capital group structure does not enter the mainstream of theoretical considerations. A company which leases employees uses nonstandard forms of employment to all employees (also in the sphere of stabilization and the core of employment) and the used tools of human resources management are highly professional. The specifics of the analyzed solution are connected with the phenomenon of knowledge transfer and isomorphism in capital group structure.
Style zarządzania kobiet i mężczyzn w biznesie
Authors: Dźwigoł-Barosz Mariola
Published: May 2021

The following article presents male and female management styles. The article shows results of research carried out by domestic and foreign researchers, including the author’s own work about sex-related management styles. It also presents management styles in hard times. A particular focus was placed on skills and competences that are of growing importance in the uncertain business environment. Furthermore, the article underlines the role of business leaders’ emotional intelligence, the latter being a supplement to rational intelligence. An emphasis was placed on the role of emotional intelligence in the economic activity, determining social relationships between employees. It is also an essential variable in the field of company management.
Motivational Interviewing as a Therapeutic Strategy for Trafficked Persons
Authors: Knott Lindsey E. , Salami Temilola , Gordon Mollie R. , Torres Melissa I. , Coverdale John H. , Nguyen Phuong T.
Published: May 2021

It is estimated that 40 million people worldwide have experienced human trafficking (UN, International Labour Organization & Walk-Free Foundation, 2019), with 313,000 trafficked persons in the state of Texas alone (Busch-Armendariz et al., 2016). These staggering numbers are indicative of human trafficking as a growing public health concern. To date researchers have neither studied nor proposed a specific psychotherapeutic modality in the treatment of trafficked persons. Given the unique concerns of this populations, including mistrust of authority, emotional coercion, and abuse by traffickers, often co-occurring substance use concerns, and difficulty with standard treatment adherence, we propose a therapeutic strategy that might assist providers in addressing a broad range of concerns, particularly assisting trafficked persons in the effort to leave their situation. This strategy is motivational interviewing (MI; Miller et al., 2009) and has shown substantial efficacy to enhance motivation to change as applied within in a broad range of healthcare settings. We briefly review the broad tenants of MI and illustrate its application within two hypothetical cases of trafficking. Future research that examines the potential benefits of MI within trafficking populations is warranted.
Call for papers: LGBTI+ population and healthcare context
Authors: Valerio Paolo , Scandurra Cristiano , Frost David M.
Published: May 2021

Although research on the health of LGBTI+ populations is expanding rapidly, including a focus on social and health policies, the experiences of LGBTI+ people within healthcare contexts needs to be explored in even more in detail. An increasing body of research has demonstrated that LGBTI+ people face health inequalities, which are due to the pernicious effects of social stigma. A more accurate understanding of the quality of care received and perceived by this population represents a fundamental social issue and a central focus for reducing health inequalities. Indeed, many LGBTI+ people still avoid healthcare contexts for fear of discrimination from healthcare providers. On the other hand, many healthcare providers still have little knowledge about the specific health needs of this population. A further issue concerns the structural/institutional stigma embedded within some health organizations due to the existence of laws and regulations that not guarantee full equality for LGBTI+ populations. The focus of this thematic issue is the experience of LGBTI+ people within healthcare contexts. We invite contributions from a plurality of theoretical and methodological perspectives, including but not limited to: clinical and social psychology, sociology, philosophy, jurisprudence, diversity management, organization and HR management. Qualitative, quantitative and/or mixed-method design are welcome, as well as reviews and critical reflections. Manuscripts focused on the experiences of intersectionality (e.g., intersections of race, ethnicity, ability, class, migration status, etc. within LGBTI+ populations) and from diverse geographic regions are particularly welcome.
Electrophilic Cyclization of Diterpenoids
Authors: Kulciţki Veaceslav , Grinco Marina , Vlad Pavel , Ungur Nicon
Published: May 2021

A review of diterpenoid cyclization initiated by electrophilic reagents is provided. Conventional protonic and Lewis acids are examined along with superacids as initiators of cyclization cascade. An emphasis is placed on the use of cyclization reactions as a tool for the synthesis of compounds with potential practical utility. The review contains 74 references.
The Synthesis and Study of Tetranuclear Cluster [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]⋅THF
Authors: Prodius Denis , Mereacre Valeriu , Sergiu Shova , Gdaniec Maria , Simonov Yurii , Sorace Lorenzo , Caneschi Andrea , Stanica Nicolae , Geru Ion , Turta Constantin
Published: May 2021

The novel bis(μ3-oxo) tetranuclear trichloracetate cluster, [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]⋅THF (1), has been synthesised and subsequently characterised by X-ray structure analysis, magnetic measurements and infra red (IR). The structure of cluster is “butterfly” type. The Fe···Fe separation has the value of 2.883(1) - 3.441(7) Å. The coordination number of iron (III) is 6. Magnetic studies reveal the presence of an antiferromagnetic exchange in the parallelogram skeletons of the tetranuclear species. Using the spin Hamiltonian H = -2Jwb(Ŝ1Ŝ2 + Ŝ2Ŝ3 + Ŝ3Ŝ4 + Ŝ4Ŝ1) - 2JbbŜ2Ŝ4v+ gμβ(Ŝ1z + Ŝ2z +Ŝ3z + Ŝ4z)B, the fitting parameters Jbb = - 14.3 cm-1, Jwb = - 32.1 cm-1 , g = 2.07, ρparam. -5 impur. = 4.2 %, ΘCurie-Weiss const. = -0.5 K and R = 6.8·10 were obtained.
Iodination of Vegetable Oil as a Method for Correcting Iodine Defficiency
Authors: Sturza Rodica
Published: May 2021

The aim of this work is the study made for obtaining iodized oil that would satisfy the requirements in iodine for human body. The sunflower oil is a product with the most important value, thus the production of oil fortified with iodine would be a cheap and accessible option. These studies indicate that lipids present an important vehicle for the fortification with iodine. Eradication of the iodine deficiency may be realized not only by injection of the iodinated oil, but also by its use as an ingredient for the formulation of different food compositions. This method, complementary with the iodinated salt, would allow the increase of the efficiency of the prophylactic undertaken measures, because is based on the use of vegetal material – sunflower oil; it is cost-efficient and does not require substantial investments.
The Structure of the Tetra-Potassium Salt of Calix[4]Arene Dihydroxyphosphonic Acid
Authors: Lazar Adina N. , Danylyuk Oksana , Suwinska Kinga , Coleman Anthony W.
Published: May 2021

The solid-state structure of the tri-potassium calix[4]arene dihydroxyphosphonate salt is presented. In this structure, two potassium cations bridge between layers of dimeric calixarene diphosphonate units and two other potassium cations bridge along the face of the layers. The ubiquitous dimeric association of the calixarenes shows the highest interdigitation value so far observed. As expected, the cations are solvated and are complexed exo with respect to calixarene crown. The octahedral coordination sphere of the potassium cations is formed by two phosphonate groups of the calixarenes and four water molecules. Electrostatic forces represent the major element of interaction in the solid-state system.
Interaction of Quadruple Bonding Rhenium Unit with Free Radicals
Authors: Shtemenko A.V. , Tretyak S.Y. , Golichenko A.A.
Published: May 2021

The interaction of cis-Re2(RCOO)2Cl4, trans-Re2(RCOO)2Cl4, Re2(RCOO)3Cl3 and Re2(RCOO)4Cl2 (where R - alkyl group) with 1,3,5-triphenylverdazyle radical in 1,2-dichlorethane was investigated. It is discovered, that gradual substitution of halogenide ligands by carboxylates in dirhenium(III) clusters led to slowing down of reaction with a radical due to different influence of these ligands on parameters of rhenium - rhenium bond. Presented data showed perspectivity of Re26+-substances applications as therapeutic agents due to their low toxicity and antiradical properties that occured by δ-component of quadruple Re-Re bond electron transition.
Structure and Redox Transformations of Iron(III) Complexes with Some Biologically Important Indole-3-Alkanoic Acids in Aqueous Solutions
Authors: Kovács Krisztina , Kamnev Alexander A. , Shchelochkov Alexei G. , Kuzmann Ernő , Mink János , Megyes Tünde , Vértes Attila
Published: May 2021

Interactions of a series of indole-3-alkanoic acids (with n-alkanoic acid side-chains from C1 to C4) with iron(III) in acidic aqueous solutions have been shown to comprise two parallel processes including complexation and redox transformations giving iron(II) hexaaquo complexes. The structure and composition of the reaction products are discussed, as analysed using a combination of instrumental techniques including 57Fe Mössbauer, vibrational and HNMR spectroscopies.
Inhibition of in Vitro Nitrosation of Nornicotine
Authors: Porubin Diana
Published: May 2021

The inhibition of nornicotine nitrosation was studied. The concentration of nornicotine was 100 μM and nitrite 1000 μM. As inhibitors were used following compounds: ascorbic acid (as reference) (800, 1000, and 5000 μM), dihydroxyfumaric acid (1000 μM), (+)catechin (1000 μM), resveratrol (1000 μM), tartaric acid (1000 μM), quercetin (1000 μM), and grape seed extract (50, 100, 150 μg/ml). The best inhibitory effect was obtained for AAs at 5000 μM (90.7%), (+)Ct (95.5 %) and GSE at 150 μg/ml (96.1%). The small inhibitory effect was observed for TA – 22,5%.
Use of Carbon Catalysts for Oxidative Destruction of Wastewaters
Authors: Stavitskaya Svetlana S. , Kartel Nikolai T.
Published: May 2021

The paper considers a possibility of using the catalytic action of the carbonaceous adsorbents modified by different ways for the purification of various solutions, natural and wastewaters. It has been found that the oxidative destruction of organic (phenols, dyes, pesticides, etc.) and inorganic (H2S) contaminants in water solutions is considerably intensified in the presence of both ordinary activated carbons and especially, carbons with specially introduced catalytic additives. It is shown that the sewage treatment level is strongly affected by the amount and nature of a modifying agent introduced on the carbon surface.
Sorption of Ga (III) on Flexible Open Cell Polyurethane Foam of Polyether Type Impregnated with Tri-N-Buthyl Phospate
Authors: Tofan Lavinia , Bilba Doina , Paduraru Carmen , Toma Ovidiu
Published: May 2021

The obtained results concerning the Ga (III) ion retention on flexible open cell polyurethane foam of polyether type pretreated with tri-n-butyl phosphate are presented. The influence of solution acidity, phases contact time, Ga (III) concentration and solution temperature have been investigated. The parameters of Ga (III) batch sorption have been optimized. On the basis of Langmuir isotherms, the sorption constants and the thermodynamic parameters, ∆G, ∆Η and ∆S have been calculated.
Nanoscopic Molecular Cluster V15: High-Field Epr and Magnetization at Ultra-Low Temperatures
Authors: Tsukerblat Boris , Tarantul Alex , Müller Achim
Published: May 2021

In this paper we give a short overview of our efforts in the understanding of the magnetic properties of the fascinating nanoscopic cluster K6[VIV15As6O42(H2O)]·8H2O (hereafter V15) exhibiting layers of magnetization. We analyze EPR and adiabatic magnetization of the V15 cluster with a triangular VIV3 array causing spin frustration. A model for V15 includes isotropic and antisymmetric (AS) exchange interactions in the general form compatible with the trigonal symmetry. Orientation of the AS vector (but not only its absolute value) is shown to play an important physical role in spin-frustrated systems. We were able to reach perfect fit to the experimental data on the stepwise dependence of magnetization vs. field at ultra-low temperatures. Furthermore, it was possible for the first time to estimate precisely two components of the AS vector coupling constant, namely, in-plane component and the perpendicular part. We show that only intramultiplet transitions in EPR are allowed when the vector of AS exchange is normal to the plane of vanadium triangle, meanwhile the in-plane part of AS exchange gives rise to a series of weak intermultiplet transitions. Experimental data on high-frequency EPR of V15 at low temperatures are discussed. The spin-vibronic effects in trimeric spin frustrated clusters are also studied and an important role of the interplay between the AS exchange and Jahn-Teller interaction is revealed. The results clarify the concept of spin-frustration in view of its magnetic and spectroscopic manifestations in metal clusters.
Research Directions and the Most Relevant Achievements of Chemistry Researchers in the Republic of Moldova for the Period of 2004-2007
Authors: Vlad Pavel F. , Duca Gheorghe
Published: May 2021

The first International Conference organized by the Chemical Society of Moldova has taken place in the early October 2003. Following are the most important research directions, objectives and realizations, achieved by different institutions involved in chemical research during the period of 2004-2007, presented in a very concise form.
The Mixtures of 2.4-Dinitrophenylhidrazones of Inferior Carbonyl Compounds and their HPLC Separation with Gradient Binary Mixtures Phases
Authors: Zgherea Gheorghe
Published: May 2021

Mixtures of small quantities of carbonyl compounds are presents in foods, concerning sensorial qualities. The inferior carbonyl compounds (C2-C4, boiling point <100°C) – mono and dicarbonyl – can be identified and measured their concentrations, after a separation by distillation on the water bath. They are transferred in a strongly acid solution of 2.4-dinitrophenylhidrazine (2.4-DNPH), generating a mixture of insoluble 2.4-dinitrophenylhidrazones (2.4-DNPH-ones). The 2.4-DNPH-ones are organic compounds with weak polarity, solids, crystallized, yellows and water insoluble, soluble in organic solvents. The mixture of 2.4dinitrophenylhidrazones may be separated by liquid chromatography, using the reverse phase mechanism [1-3]. This paper contains experimental and theoretical considerations to the means of separation through liquid chromatography of two synthetically and a natural mixtures that contain 2.4-DNPH-ones provided by inferior carbonyl compounds; to obtain conclude results, in the synthetically mixtures was introduce and 2.4-DNPH-ones provided by carbonyl compounds having three (acetone and propanal) and four (isobutyl aldehyde) atoms of carbon.
Considerations on Liquid-Chromatographic Separation for an Equimolar Mixture of 2,4-Dinitrophenylhydrazones of Acetaldehyde and Diacetyl
Authors: Zgherea Gheorghe
Published: May 2021

An equimolar mixture of 2.4-dinitrophenylhidrazones (2.4DNPH-ones) providing by acetaldehyde and diacetyl must be analyzed by liquid-chromatographic separation, using the mechanism of repartition with reverse phase; that full papers is for identification the optimal analytical conditions. As mobile phase are utilized various binary mixtures eluent, containing water and methanol, with 0-45% water. By the experimental studies were identified four domains of behavior and two optimal binary mixtures, with 25% and 45% water, thus this is a study on the behavior of binary mixtures mobile phases. The peaks are characterized by values of retention times and by position. The separation processes were appreciated by difference between the retention times of peaks; if the percent of water increase, the values of retention times is higher. When the percent of water is 45%, the difference between the retention times is maxim, associated with a change of peaks position.
Ab Initio Analysis of Exchange Interactions in [V2O(BIPY)4CL2]2+ Complex
Authors: Ogurtsov Ivan , Tihonovschi Andrei
Published: May 2021

In this work an ab initio analysis of the binuclear vanadium complex [V2O(bipy)4Cl2]2+ electronic structure is performed. The ground state was calculated to be a quintet, which means a ferromagnetic interaction between centers. The orbitals participating in exchange interaction according to ROHF+CI calculations are two molecular orbitals consisting of vanadium d-orbitals and two molecular orbitals with main contributions from p-orbitals of bipyridine ligands perpendicular to V-V axis, vanadium d- and p-orbitals and μ-oxygen p-orbital. Calculated energy values of the multielectronic states are placed in accordance with Lande rule. The value of magnetic moment at 293K calculated for the complex in vacuum taking into consideration the Boltzmann distribution and the energies of the excited states is 3.95BM which is in accordance with experimental value of 3.99BM (for complex in acetone).
Isolation of Ent-Kaur-16-En-19-Oic and Ent-Trachiloban-19-Oic Acids from the Sunflower Helianthus Annuus L.Dry Waste
Authors: Ungur Nicon , Grinco Marina , Kulciţki Veaceslav , Barba Alic , Bîzîcci Tatiana , Vlad Pavel F.
Published: May 2021

A relatively simple method for isolation of the mixture of ent-kaur-16-en-19-oic (1) and ent-trachiloban-19-oic (2) acids from dry waste of sunflower processing has been elaborated, and it has been shown that the waste can serve as an accessible source of ent-kauranic and ent-trachilobanic diterpenoids.
Ab Initio Study of the Possible Single-Center Units for Binuclear Iron Complex [Fe2(bpym)3Cl4]
Authors: Tihonovschi Andrei
Published: May 2021

In present work we study two possible single-center units for binuclear iron complex Fe2(bpym)3Cl4 –[Fe(bpym)3]2+ and Fe(bpym)2Cl2. The obtained ground states for both studied systems are singlet states. In the case of Fe(bpym)2Cl2 the lowest excited states were calculated to be 240cm-1 (triplet) and 660cm-1 (quintet) above the ground state and so are placed according to Lande rule. These states could be populated at room temperatures. For [Fe(bpym)3]2+ first excited state was found to be about 6000cm-1 above the ground state and so cannot be populated at normal temperatures.
Specific “Ionic Liquids” as New Organocatalysts of Biginelli Reaction
Authors: Sargarovschi Viorica , Styngach Eugenia , Macaev Fliur
Published: May 2021

New ionic liquids bearing an imidazolium core with a carboxy group have been prepared in an attempt to design new organocatalysts of Biginelli reaction. Trends in the properties of these compounds are discussed. The synthetized compounds represented a novel class of molted salts and may be considered as new organocatalysts for chemical reaction.
Glycosides from Linaria Vulgaris Mill
Authors: Mashcenko Natalia , Kintia Pavel , Gurev Angela , Marchenko Alexandra , Bassarello Carla , Piacente Sonia , Pizza Cosimo
Published: May 2021

A new flavonol glycoside, 5,4′-dimethylkaempferol 3-O-β-D-(6′′-α-Lrhamnopyranosyl) -glucopyranoside, together with three known compounds were isolated from the n-butanolic soluble fraction of underground and aerial parts of Linaria vulgaris Mill, collected on the territory of Moldova. The characterisation of these compounds was achieved by various chromatographic and spectroscopic methods (IR, UV, 13C-NMR, 1H-NMR and MS).
Adsorption of Ammonia Ions and Ammonium from Aqueous Solutions on Modified Activated Carbons
Authors: Lupashcu T. , Ciobanu M.
Published: May 2021

The adsorption process of ammonia ions and ammonium from aqueous solutions on the intact activated carbon obtained from nutshells through activation with phosphoric acid and oxidized with H2O2 and later impregnated with salt containing Co2+, Ag+, Ni2+, Cu2+, has been investigated. The efficiency of ammonia ions and ammonium elimination from various water categories, using both activated carbon (the intact CAN-7 and CAN-7 oxidized with H2O2 and impregnated with Co2+, Ag+, Ni2+, Cu2+ ions) has been demonstrated.
Cyclodextrins – Fields of Application. Part I
Authors: Duca Gheorghe , Boldescu Veaceslav
Published: May 2021

This review is dedicated to different fields of use of cyclodextrins, a family of three cyclic natural oligosaccharides and their derivatives. The first part of the review gives a brief description of the main and the most recent developed applications of cyclodextrins in food, cosmetic industry, environmental protection technologies and agriculture. Different products based on inclusion complexes with cyclodextrins and technologies with different use of cyclodextrins and inclusion complexes are described.
Design and Synthesis of Coordination Compounds with Tetradentate Ligands Derived from Alkylated Thiosemicarbazide
Authors: Cocu M. , Gradinaru J. , Revenco M. , Rybak-Akimova E. , Gărbălău N.
Published: May 2021

This work is devoted to the investigation of the template reactions of organic compounds derived from S-alkylisothiosemicarbazide and β-dicarbonylic compounds (acetyl(benzoyl)acetone, 2,6-diformylpyridine, 2,6-diformyl-4-methylphenol, 1-hydroxy-2-naphthaldehyde, sodium nitromalonic dialdehyde, 1,1,3,3-tetraetoxypropane, 3-ethoxyacroleine) in the presence of 3d-metal ions, determination of the structure and properties of the prepared complexes. There were elaborated original methods for synthesis of open-chain or macrocyclic coordination compounds of nickel(II), copper(II), oxovanadium(IV) and cobalt(II) with N4, N3O and N2O2 tetradentate ligands. Two types of hexaazamacrocyclic systems with trans- and cis- arrangement of thiosemicarbazide fragments have been obtained using template condensation of different precursors. The biostimulative properties (biomass accumulation and increasing of enzymatic activity) of complexes have been established. Some complexes of nickel(II) have been studied as coloring agents for plastics.
Synthesis and Application of the 11-Bishomodrimane-8α-Ol -12-One
Authors: Aricu Aculina
Published: May 2021

This review deals the methods of preparation of the 11-bishomodrimane-8α-ol-12-one, a convenient synton for the synthesis of drimanic and bishomodrimanic compounds, including the biologically active ones. The triterpenic tetracyclic derivatives of the onoceranic range and the fragrance compounds with ambergris odour can be also obtained from this compound.
Activation of Acetylene by Coordination to Bis-Triphenylphosphine Complex of Pt(0): DFT Study
Authors: Gorinchoy N. N. , Dobrova B. , Gorbachev M. Yu. , Munteanu G. , Ogurtsov I. Ya.
Published: May 2021

The present work is devoted to the theoretical study of the activation of the acetylene molecule coordinated in the [Pt(PPh3)2C2H2] complex. By means of DFT calculations it is shown that the geometrical and electronic characteristics of the C2H2 are essentially changed due to its coordination. The subsequent detailed analysis of the molecular orbitals (MO) of the active valence zone of this complex allows one to make important conclusion that this activation is being realized mainly due to the orbital back donation of 5d-electronic density from one of the occupied MOs of the complex [Pt(PPh3)2] to the unoccupied antibonding π*-MO of C2H2.
Inelastic Neutron Scattering, EPR and Spin Chirality in Spin-Frustrated V3 and Cu3 Nanomagnets with Dzialoshinsky-Moriya Exchange
Authors: Belinsky Moisey I.
Published: May 2021

The inelastic neutron scattering (INS) and EPR transitions are considered for the spin-frustrated V3 and Cu3 nanomagnets. It is shown that the DM exchange and distortions determine the Q-dependence and redistribution of the intensities of the intra- and inter-doublet INS transitions in the 2(S=1/2) states as well as the intensities of the EPR transitions. The peculiarities of the INS and EPR spectra of the V3 ring of V15 quantum molecular magnet and EPR spectra of the V3 and Cu3 nanomagnets are described by the isosceles Heisenberg model with the DM exchange. Spin chirality and spin structure of the Cu3 and V3 nanomagnets with the Dzialoshinsky-Moriya (DM) exchange interaction are analysed in the vector and scalar spin chirality models. The vector chirality model describes the field, orientation and deformation dependence of the spin chirality κn. The spin chirality is formed by the DM interaction and depends on the sign of the DM parameter Gz. The DM exchange and distortions determine the degree of chirality κn<1 in the isosceles clusters.
Monitoring of the Eurasian Natural Mineral Waters of Chloride-Hydrocarbonate Type
Authors: Kornilova E.N. , Kornilov N.I. , Vasiltseva O.N.
Published: May 2021

Mineral waters of Russia, the CIS countries (Ukraine, Belarus, Moldova, Armenia, Azerbaijan, Georgia and Uzbekistan) and EU (Germany, France, Italy, Spain and some East European countries) carried to Chloride-Hydrocarbonate type have been investigated in this work. The analytical dependences connecting, entered by authors, characteristic parameters of structure of waters (В, Ф, R) with independent variables of ionic structure and concentration are resulted.
Flow Injection Analysis System Coupled with ICP-EOS for Determination of Some Metallic Elements in Drinking Water
Authors: Dinu Cristina , Vasile Gabriela , Cruceru Liliana , Petre Jana
Published: May 2021

The European Drinking Water Directive (98/83/EC), transposed in Romanian Legislation as Low 458/2002, amended by Low 311/2004, imposes the limit of concentration for metallic elements in water intended for human consumption. The toxic metals arsenic and selenium are among these elements and the limit value is 10 μg/L. In the paper there are presented the working conditions for determination of As and Se from drinking water using modern techniques based on the fl ow injection-hydride generation with the inductively coupled plasma atomic emission spectrometry (FIAS-ICP-EOS). The analyses were performed on Optima 5300 DV Perkin Elmer equipment with FIAS 400 Flow Injection System, Perkin Elmer type. For the hydride generation two types of solution were used: 10% (v/v) HCl as a carrier solution and 0.2 % NaBH4 in 0.05%NaOH solution as a reducing agent [1]. The treatment step of the samples and standard solutions consisted in reducing with mixed solutions of KI and ascorbic acid in acidic condition (HCl) for As and only with HCl and high temperature for Se [2,3]. The paper contains the characteristic parameters of the methods, such as: low detection limit, quantifi cation limit, repeatability, precision, recovery, which were evaluated using Certifi ed Reference Materials for each element.
Implications of Global and Local Mobility in Amorphous Excipients as Determined by DSC and TM DSC
Authors: Dranca Ion , Lupascu Tudor
Published: May 2021

The paper explores the use of differential scanning calorimetry (DSC) and temperature modulated differential scanning calorimetry (TM DSC) to study α- and β- processes in amorphous sucrose and trehalose. The real part of the complex heat capacity is evaluated at the frequencies, f, from 5 to 20mHz. β-relaxations were studied by annealing glassy samples at different temperatures and subsequently heating at different rates in a differential scanning calorimeter.
Synthesis and Study of Complexes of Copper(II), Zinc, Cobalt(II) and Nickel(II) with Nitrofluorenylidene-9-Amino(Imino) Derivatives
Authors: Strashnova S.B. , Avramenko O.V. , Zhuk M.N. , Kovalchukova O.V. , Strashnov P.V. , Zaitsev B.E.
Published: May 2021

The complexes of general formula MCl2∙L1-4∙nH2O (where L1 - N-(2,4,7-trinitrofluorenilidene-9)-p-dimethyl-aminoanilin, L2 - N-(2,4,5,7-tetranitrofluorenilidene-9)-p-dimethylaminoaniline, L3 - N-(2,4,7-trinitrofluorenilidene)-N-(p-dimethylaminophenyl)hydroxylamine, L4 - N-(2,4,5,7-tetranitrofluorenilidene-9)-N-(p-dimethylaminophenyl)-hydroxylamine; M=Cu, Co, Ni, Zn; n= 1-3 have been synthesized and investigated by different methods. Spectral criteria of co-ordination of the molecules L1 –L4 in electronic adsorption spectra were detected.
(-)-Drimenol – a Valuable Starting Compound for the Synthesis of Drimanic Sesquiterpenoids
Authors: Aricu Aculina
Published: May 2021

(-)-Drimenol is a relatively accessible compound, that has been and may be further used as a starting material to prepare sesquiterpenoids. The present review deals with the methods of obtaining of this compound as well as its usage.
Stabilization of Unusual Substrate Coordination Modes in Dinuclear Macrocyclic Complexes
Authors: Lozan Vasile
Published: May 2021

The steric protection offered by the macrobinucleating hexaazaditiophenolateligand (L) allows for the preparation of the first stable dinuclear nickel(II) borohydride bridged complex, which reacts rapidly with elemental sulphur producing a tetranuclear nickel(II) complex [{(L)Ni2}2(μ-S6)]2+ bearing a helical μ4-hexa- sulfide ligand. The [(L)CoII 2]2+ fragment have been able to trap a monomethyl orthomolybdate in the binding pocket. Unusual coordination modes of substrate in dinuclear macrocyclic compounds was demonstrated.
The Evolution of Biochemical Oxidation of Ammonia Ions in Small Rivers Water
Authors: Mosanu Elena , Spataru P. , Lupascu T. , Sandu Maria , Goreacioc Tatiana , Tarita A.
Published: May 2021

Nitrification is the oxidation of ammonia to nitrate, via nitrite and it occupies a central position within the global nitrogen cycle. Nitrifying bacteria are the organisms capable of converting the most reduced form of nitrogen, ammonia, to the most oxidized form, nitrate, but their activity is influenced by pollution level. Starting with the assumption that pollution of small internal water courses in the Republic of Moldova remained severe (phenols, detergents and copper regularly exceed the MACs) the work presented in the paper discusses the evolution of ammonia ions nitrification in the water of river Prut tributaries and its correlation with the content of pollutants in water: surface-active substances, Cu, BOD5, COD and other compounds.
Tudor Lupaşcu – a Brilliant Scientist and Skilfull Manager
Authors: Duca Gheorghe
Published: May 2021

The Moldovan chemical community has recently honoured Professor Tudor LUPAŞCU on the occasion of his 60’s anniversary. Known as brilliant scientist and skilful manager, Professor LUPASCU is now the director of the Institute of Chemistry and one of the founders of the “Chemistry Journal of Moldova”, being the Managing Editor from the very beginning of its activity.
The Reactions of (+)-2- and (+)-3-Carenes with the Retention of the Bicyclic Framework
Authors: Bets L. , Vlad L. , Macaev F.
Published: May 2021

Carane-type compounds have attracted attention in recent years due to their practical importance. This review is focused on describing the developments in the synthesis of trimethylbicyclo[4.1.0]heptanes and their unsaturated analogues from monoterpenes (+)-2- and (+)-3-carenes published mostly during the last decade.
Catalytic Wave of Chlorate Ions in the Prezence of the Molybdenum (VI) - 2,3-Dihydroxybenzaldehyde Complex
Authors: Kiriyak Ludmila , Cazac Tatiana , Revenco M. , Povar I.
Published: May 2021

The polarographic catalytic current in acid solutions of Mo(VI), 2,3-dihydroxybenzaldehyde (2,3-DHBA) and chlorate ions has been investigated. The scheme of reactions taking place in the solutions and on the electrode has been elaborated. The increase of the catalytic current is explained by the formation of the active intermediate complex [Mo(V)×2,3-DHBA (ClO3-)]. The rate constant of formation for the active intermediate complex K = 2.5 × 106 mol-1 × dm3 × s-1, the activation energy of reaction Ea=14.0 kcal×mol-1 and the activation entropy ∆Sa¹= -28.3 e.u. have also been determined.
Catalytic Oxidation of Methylene Blue
Authors: Lupaşcu T. , Ciobanu M. , Boţan V. , Nistor A.
Published: May 2021

The intact activated carbon CAN-8, obtained from nutshells by activation with water vapours, in the presence of oxygen and at relatively low temperatures, possesses catalytic activity, caused by the presence of alkaline functional groups on its surface, as well as by the formation, in these experimental conditions, of the OH radical, which has a high oxidation potential. After 25 cycles of the process of methylene blue oxidation, the data of chromatographic analyses indicate the presence of three organic components in the solution.
Modified Screen-Printed Carbon Electrodes with Tyrosinase for Determination of Phenolic Compounds in Smoked Food
Authors: Dragancea V. , Sturza R. , Boujtita M.
Published: May 2021

A screen-printed carbon electrode modified with tyrosinase (SPCE-Tyr/Paa/Glut) has been developed for the determination of phenol concentration in real samples. The resulting SPCE-Tyr/Paa/Glut was prepared in a one-step procedure, and was then optimized as an amperometric biosensor operating at 0 mV versus Ag/AgCl for phenol determination in flow injection mode. Phenol detection was realized by electrochemical reduction of quinone produced by tyrosinase activity. The possibility of using the developed biosensor to determine phenol concentrations in various smoked products (bacon, ham, chicken and salmon) was also evaluated. Gas chromatography (GC) method was used for result validation obtained in flow injection mode using amperometric biosensor. The result showed good correlation with those obtained by flowinjection analysis (FIA).
Metallic Compounds in the Phase of the Reticulated Ionic Polymers
Authors: Gutsanu Vasilii , Turta Constantin , Filoti George
Published: May 2021

Using the Mossbauer spectroscopy and other physical methods it was demonstrated the presence of different iron compounds like β-FeOOH, α-Fe2O3, and jarosite mineral type compounds: (R4N,H3O)[Fe3(OH)6(SO4)2] or coordination modes: {RCOO-Fe(L4)-OOCR}1+, {R-CO2=Fe(X2)=O2C-R}n, {R-COO-Fe(X4)-OOC-R}n, and {(-NCH2CH2N-)= Fe(X2) =(-NCH2CH2N-)}, where X= H2O, OH-, SO42-., n= from 3- to 1+ in the ion-exchange resins (KU-2, AN-31, AV-17, Varian – AD, EDE-10P) after the contact with sulphate of iron(III) solutions at different conditions: type of solvent, temperature, air atmosphere. In special conditions the ultrafine superparamagnetic particles of Fe2O3 have been obtained.
Synthesis and Antiviral Activity of New Thiazole, 1,2,4-Triazol and Oxindole Derivatives
Authors: Radul Oleg , Sucman Natalia , Pogrebnoi Serghei , Barba Alic , Geronikaki Athina , Macaev Fliur
Published: May 2021

The synthesis and antiviral activity evaluation of new derivatives of 2-aminothiazole, 1,2,4-triazole, as well as oxindoles has been realized. The synthesized compounds exhibited different cytotoxicity, in particular, oxindols 4, 5 , 7 , 8 , 9, 10, 11, 12, 13, 58 as well as thiazole/triazole 73 and 75 turned out to be the most cytotoxic for MT-4 cell lines. The compounds 11, 12, 73, and 75 are more toxic than reference compound Efavirenz. As far as the antiviral activity is concerned, none of the title compounds turned out active against Reo-1, Sb-1, VSV, RSV, YFV and VV viruses. The results obtained against Bovine Viral Diarrhoea Virus (BVDV) showed that nine compounds (six from oxindol’s seria 6, 12, 13, 52, 56, 58 and three 73, 75, 77 of triazole homologues) resulted moderate active. Among all of them, the most potent compound was 52, with EC50 of 6.6 μM. Studies of effect of synthesized compounds against Coxsakie Virus (CVB-2) revealed that only two compounds, 13 and 73 exhibit moderate activity (EC50 >40 and >18 μM, respectively). It should be noticed that eleven compounds, 4, 5, 7, 8, 9, 10, 11, 12, 13, 58, and 75 showed moderate activity against HIV-1 (EC50 >16 – m >59μM).
Synthesis and Characterization of [(5-Mercapto-1,3,4-Oxadiazol-2-YL)Aryl]-3,5-Diaryl-4,5-Dihydro-1H-Pyrazole-1-Carbothioamides
Authors: Ribkovskaia Zinaida , Pogrebnoi Serghei , Barba Alic , Macaev Fliur
Published: May 2021

The synthesis and characterization of [(5-mercapto-1,3,4-oxadiazol-2-yl)aryl]-3,5-diaryl-4,5-dihydro-1Hpyrazole-1-carbothioamides - derivatives of pyrazolines and 5-[4(3)-isothiocyanatophenyl]-2-thio-1,3,4-oxadiazoles were realized. The synthesized compounds, are crystalline substances, stable in storage and when exposed to air and light.
High-Performance Liquid Chromatography for Determination of Aromatic Aldehydes in Wine Distillates
Authors: Nezalzova Elena
Published: May 2021

Quality control of alcoholic beverages, coming into the market, is a defining element in preventing the production and supplying of defective products. One of the main criteria for quality control of wine distillates is to estimate their age, and more precisely the period of maturation as the dominant factor in determining the quality of cognacs and, consequently, their market price. On the opinion of majority scientists, one of the main factors, which determines the age of wine distillates, is the content of aromatic aldehydes, mostly vanillin, and their ratio.
Phase Stability of Monoatomic Alcohol-Gasoline Mixtures for Different Compositions and Hydrodynamic Conditions
Authors: Cerempei Valerian
Published: May 2021

The article investigates phase stability for the mixtures of monoatomic alcohols (ethanol, butanol) with gasoline in the presence of water. There have been determined the optimal storage conditions of mixtures depending on their composition and mixing conditions. The positive influence of butanol on the phase stability of ethanol-gasoline mixtures was detected.
Voltammetric Behavior of Some Steels in Aqueous Solutions of HNO3
Authors: Nemtoi Gheorghe , Airinei Liliana , Lupascu Tudor , Cecal Alexandru
Published: May 2021

The corrosion process of some steels immersed in HNO3 solutions of different concentrations by means of voltammetric measurements was investigated. For different values of the corrosion potential, or of the contact time: solid steel-aggressive medium, several equations of the type: I = f (E) were proposed, only for linear domains of the voltammograms.
Synthetic Approaches to Polifunctionalized Perhydrindanes
Authors: Kulciţki Veaceslav
Published: May 2021

The current communication represents an extended abstract of the presentation delivered on the joint Moldo-Italian seminar “New frontiers in natural product chemistry”, held in the Institute of Chemistry, Academy of Sciences of Moldova on 31 September. An overview of the synthetic methods oriented to the synthesis of functionalized terpenic perhydrindanes is provided. Different synthetic strategies are considered, including those based on biomimetic approach. The array of obtained new structures can serve as leads in structure-activity studies as well as useful building blocks towards other perhydrindanes.
Synthesis and Spectroscopic Study of Some Coordinative Compounds of Co(III), Ni(II) and Cu(II) with Dianiline- and Disulfanilamideglyoxime
Authors: Rija Andrei , Bulhac Ion , Coropceanu Eduard , Gorincioi Elena , Calmîc Elena , Barbă Alic , Bologa Olga
Published: May 2021

Directed synthesis of dianiline- (DAnH2) and disulfanilamideglyoximes (DSamH2) has been accomplished by condensation of dichloroglyoxime with aniline or sulfanilamide in 1:2 molar ratio, as well as their corresponding Co(III), Ni(II) and Cu(II) coordinative compounds. Composition, structure and some properties of dioximes and complexes have been established by using elemental analysis, UV-Vis, IR and NMRspectroscopies. Dioxime coordination at the central atom and structure of complexes depends on pH of reaction medium: at pH=5-6 - bis-dioximates, whilst at pH=2 – tris-dioximines are obtained.
Unusual Properties of Water
Authors: Lipkowski Janusz
Published: May 2021

Water has been known for its unusual properties from antiquity when, e.g. was found that hot water freezes faster than cold water. Presently, on the web page 'water' Martin Chaplin [1] lists sixty seven properties of water which may be considered 'anomalous' when comparing to 'normal' chemical substances. Much of this can be attributed to the spatial structure of hydrogen bonding in condensed phases of water. Hydrogen bonding constitutes about 2/3 of cohesion energy of water. However, the remaining 1/3 is definitely not negligible. Combination of the two leads to properties of water in the systems where it plays a role. The very comprehensive range of such systems and common presence of water make the enormous variety of structures and properties of water-containing compounds. In the present paper the non-hydrophilic component of properties of water will be emphasized in combination with the structural aspects of supramolecular bonding of water molecules.
Waste Dumps in Latvia: Former Landfilling, Consequences and Possible Recultivation
Authors: Burlakovs Juris , Vircavs Magnuss
Published: May 2021

Particular attention in this article is paid to the research of two waste dumps in the capital city of Latvia – Riga, which are planned to be re-cultivated in the nearest future and one site, which is former toxic hazardous soil dump site, where the remediation of site is of priority need. The present study is giving a general overview of contamination level in two waste dumps in Riga, which were made in the period from 50-ties to 70-ties of the 20th century, also the case of hazardous soil dump site formed in a period of more than 100 years is described. Planned actions as well as direct remediational technologies to reduce the poisonous impact to the urban environment and the role of re-cultivation in the urban planning in general are proposed.
Environmental Assessment of Heavy Metals Content in Soil-Plant System
Authors: Stasiev Gr. , Eni I. , Leah T.
Published: May 2021

The content of heavy metals (Ag, Cd, Sn, Cs, Ba, La, Rb, Sr, Mn, Fe, Cu, Zn) has been determinate in the soil-plant system: cambic chernozem - winter wheat. It was found that the amount of Ag, Sb, Sn and Ba are accumulating in soil, exceeds the admissible concentration limit. In winter wheat, the content of Cd, Fe and Zn exceed the maximum admissible concentrations. The Rb, Mn, Zn accumulates in the winter wheat grains, and Fe and Cu – in the vegetal organs of wheat.
Environmental Regulation of Trace Elements in Soils of Moldova
Authors: Kiriliuc Vladimir
Published: May 2021

The scale of environmental regulation (content and pollution levels) of trace element in soils of Moldova was proposed. Contamination levels are justified, depending on the adverse effects that have trace elements in soils, plants, groundwater and more - per person. Proposed scale has 6 content and 4 pollution levels. Together with equalized MPC may help to consider a number of deficiencies that are available in this area and improve the practical application of the assessment of soil contamination. Scale Indicators are flexible values, taking the large variability content of trace elements.
Biochemical Processes in Chernozem Soil under Different Fertilization Systems
Authors: Emnova Ecaterina
Published: May 2021

The paper deals with the evaluation of the intensity of certain soil biochemical processes (e.g. soil organic C mineralization) at Organic and mixed Mineral+Organic fertilization of typical chernozem in crop rotation dynamics (for 6 years) by use of eco-physiological indicators of biological soil quality: microbial biomass carbon, basal soil respiration, as well as, microbial and metabolic quotients. Soil sampling was performed from a long-term field crop experiment, which has been established in 1971 at the Balti steppe (Northern Moldova). The crop types had a more considerable impact on the soil microbial biomass accumulation and community biochemical activity compared to long-term Organic or mixed Mineral + Organic fertilizers amendments. The Org fertilization system doesn’t make it possible to avoid the loss of organic C in arable typical chernozem. The organic fertilizer (cattle manure) is able to mitigate the negative consequences of long-term mineral fertilization.
Research on Detoxication of Soils Polluted with Arsenium and Development of New Sorbing Materials
Authors: Kireycheva L.V. , Moskovkina L.I.
Published: May 2021

Arsenium being a hazardous substance is harmful for plants, animals and people. Having been applied to the soil arsenium is partly transformed as the result of interaction with the soil minerals. It may enter plants, animals as well as human body through the feed circuit. Nowadays issue of the anthropogenic impact diminishing as well as environmentally friendly farm production obtaining in the polluted soils becomes more and more urgent. Therefore development of soil detoxication techniques using natural sorbing materials is challenging and timely.