Matches 1 - 50 out of 132 1 2 3 >

AcclaimIP-ad

Match Document Document Title
198809311 Sonication effects on ester hydrolysis in alcohol--water mixtures/Ultraheliefektid estri hudroluusile alkoholi-veesegudes.  
Kinetics of the neutral hydrolysis of 4-nitrophenyl chloroacetate was investigated in water and in the presence of 1 mol % of ethanol, propanol, and -butyl n alcohol without sonication and under...
198809310 Ionic liquids as background electrolyte additives and coating materials in capillary electrophoresis/Ioonsed vedelikud taustelektroluutide ja pinnakattematerjalina kapillaarelektroforeesis.  
Now that many scientific investigations focus on ionic liquids (IL) to establish their potential in different chemical processes, their application for the separation of various classes of...
198809309 Characterization of bioactive compounds contained in vegetables of the Solanaceae family by capillary electrophoresis/Bioaktiivsete komponentide maaramine Solanaceae perekonna taimedes kapillaarelektroforeesi abil.  
Because of their antioxidative capability polyphenols and vitamins are the most important naturally occurring compounds. Several widely consumed vegetables are rich in various phenolic compounds...
198809308 Purification and properties of amine oxidase from pea seedlings/Amiini oksudaasi puhastamine ja omadused.  
Amine oxidase (EC 1.4.3.6) was purified from pea (Pisum sativum) seedlings with the aim of characterizing its catalytic properties. The specific activity and selectivity of the enzyme were studied...
198707079 Calcium--aluminothermal production of niobium and mineral composition of the slag/Nioobiumi tootmine kaltsium-alumotermilisel meetodil ja slakkide mineraalkoostis.  
The process of niobium pentoxide calcium--aluminothermal reduction in pilot plant and full scale conditions was studied at Silmet JSC, Estonia. In the paper the construction and operating...
198707078 Pesticide residues in commercially available oranges and evaluation of potential washing methods/Apelsinide pestitsiidijaakide analuus ja puuviljade pesemisviiside efektiivsuse hindamine.  
Pesticides, which are widely used in agriculture to increase production or protect crop, are known to be potentially dangerous to consumers. Therefore oranges from local supermarket were analysed...
198707077 Comparative determination of microelements in Baltic seawater and brown algae samples by atomic absorption spectrometric and inductively coupled plasma methods/Balti mere vetikate ja merevee mikroelementide vordlev analuus AAS- ning ICP-meetodite abil.  
A variety of spectroscopic methods (ETAAS, FAAS, ICP-MS, ICP-OES) were comparatively characterized with respect to analysis of brown alga Fucus vesiculosus and Baltic seawater samples (with a...
198707076 Comparative calculations of alkali metal cation basicities of some Lewis bases/Lewisi aluste leelismetallikatiooni aluselisused: monede arvutuskeemia meetodite vordlus.  
Lithium, sodium, and potassium cation basicities were calculated for some Lewis bases using the DFT B3LYP/6-311+[G.sup.**], G2, G2(MP2), G3, and CBS-QB3 methods and compared with corresponding...
198809254 Chemistry of the isocyanides and their multicomponent reactions, including their libraries--the initiatives of Ivar Ugi.  
198809253 Column study of the leaching and degradation of anionic surfactants in oil-polluted soil/Anioonsete pindaktiivsete ainete leostumise ja lagunemise uurimine reostunud pinnase kolonnides.  
The study was carried out with coarse-grained and fine sandy oil-polluted soils in column tests and the soil was treated with the bioremediation agent SR-100. The concentrations of the...
198809252 Monitoring of oil products and hazardous substances in Estonian surface water bodies/Naftaproduktide ja ohtlike kemikaalide seire Eesti pinnaveekogudes.  
Compared to the "old" member states of the European Union little attention has been paid to the monitoring of hazardous substances in Estonia, but it is still possible to draw preliminary...
198809251 Variation in the composition of the essential oil of Valeriana officinalis L. roots from Estonia/Eeterliku oli koostise varieeruvus Eestist parineva Valeriana officinalis L. juurtes.  
The volatile constituents from roots of Valeriana officinalis L. were investigated using GC and GC/MS methods. Valerianae radix samples were obtained from retail pharmacies or cultivated in...
198809250 Some important aspects of sterol analysis of vegetable oils/Moningaid taimsete olide steroolide analuusi olulisi aspekte.  
The content and composition of the sterol fraction is an important indicator of the value of vegetable oils, mainly due to the cholesterol-lowering effect of certain sterol compounds. Although...
198809236 The effect of the method and duration of extraction on the content of biologically active compounds in herbal teas/Ekstraktsiooni meetodi ja kestuse moju bioloogiliselt aktiivsete ainete sisaldusele ravimtaimede vesitommistes.  
The extraction of some most important biologically active compound classes and constituents (water-soluble extractive, polyphenols, tannins, flavonoids, coumarins, anthraquinones, hypercin,...
198809235 Treatment of sulphate containing yeast wastewater in an anaerobic sequence batch reactor/Parmitoostuse sulfaate sisaldavate reovete tootlemine anaeroobse annuspuhasti reaktoris.  
Anaerobic mesophilic fermentation of sulphate containing yeast industry wastewaters at laboratory scale with anaerobic sequence batch reactors (ASBR) was studied. Three different treatment schemes...
198809234 On the mechanism of reactive oxygen species generation in tumour cells subjected to the phototoxic action of haematoporphyrin derivative: effect of heating/Hapniku reaktiivsete osakeste tekke mehhanismi uurimine kasvajarakkudes hematoporfuriini derivaadi fototoksilisel toimel: temperatuuri moju.  
The main aims of the study were: (1) to enrich the existing knowledge on the mechanism of [H.sub.2][O.sub.2], superoxide ([O.sub.2.sup.-*]), and protein peroxides (PPO) formation in tumour cells...
198809233 Synthesis of substituted cyclopentanones from 2-oxabicyclo[3.3.0]oct-6-en-3-one/Asendatud tsuklopentanoonide suntees 2-oksabitsuklo[3.3.0]okta-6-een-3-oonist.  
Synthesis of regioisomeric cyclopentanones 3-alkyloxy-2-oxabicyclo[3.3.0]octan-6-one (overall yield up to 34%) and 3-alkyloxy-2-oxabicyclo[3.3.0]octan-7-one (overall yield up to 18%) in four...
198809307 Structure formation in urea-formaldehyde resin synthesis/Struktuuri moodustumisest karbamiid-formaldehuudvaikude sunteesil.  
The structure formation in acid promoted polycondensation and particularly in alkaline post-treatment with urea was studied by [sup.13]C NMR spectroscopy in the three-step synthesis...
198809306 Solvent extraction and separation of lanthanoids with mixtures of chelating extractant and 4-(2-pyridylazo)-resorcin/Solvendi ekstraktsioon ning lantanoidide eraldamine kelaativate ekstrahentide segude ja 4-(2-puriduulaso)resortsiiniga.  
The solvent extraction of trivalent lanthanoids (La, Nd, Eu, Ho, and Lu) with mixtures of the chelating extractant 1-(2-thienyl)-4,4,4-trifluoro-1,3-butanedione (thenoyltrifluoro-acetone, HTTA) or...
198809305 Increasing the biodegradability of rocket fuel polluted groundwater by means of chemical oxidation processes/Raketikutusega reostatud pohjavee biolagundatavuse suurendamine keemilise oksudatsiooni meetoditega.  
Highly toxic residues of rocket fuel have been detected in the groundwater of an abandoned military missile base in north-west Estonia. The growth of indigenous rocket fuel-degrading bacteria in...
198809304 Kinetic analysis of cooperativity of phosphorylated L-type pyruvate kinase/Fosforuleeritud L-tuupi puruvaadi kinaasi kooperatiivsuse kineetiline analuus.  
Kinetics of L-type pyruvate kinase (EC 2.7.1.40) catalysed reaction between phosphoenolpyruvate (PEP) and ADP was analysed under steady-state conditions and the interaction of both substrates with...
198706126 Interaction of tritium-labelled dopamine transporter inhibitor PE2I with mice striatal membrane fragments/Dopamuni transportvalgu triitiumiga margistatud inhibiitori PE2I seostumine hiire aju juttkeha membraanifragmentidega.  
Interaction of [sup.3]H-labelled N-(3-iodoprop-2E-enyl)-2[beta] -carbomethoxy-3[beta]-(4-methylphenyl)nortropane ([[sup.3]H]PE2I), a novel tritium-labelled ligand for tracing dopamine transporter...
198706125 Composition of the essential oil of Artemisia absinthium L. of different geographical origin/Erinevatest geograafilistest paikadest parit koirohu (Artemisia absinthium L.) eeterliku oli koostis.  
Variations in the essential oil composition of Artemisia absinthium L. obtained from different geographical areas of Europe were determined using capillary gas chromatographic and mass...
198706124 Some small weakly coordinating anions based on carboranes/Moned karboraanidel baseeruvad superhapped.  
The intrinsic gas-phase acidities of [CB.sub.4][X.sub.n][H.sub.5-n]H and [CB.sub.5][X.sub.n][H.sub.6-n] (X [equivalent to] F, C1 or [CF.sub.3] were calculated using the DFT B3LYP method at the...
198706123 Degradation of lignins by wet oxidation: model water solutions/Ligniinide lagundamine margoksudatsiooniga: ligniini veelahus kui mudelsusteem.  
Nowadays many paper industries are faced with the problem of wastewaters being badly biodegradable because of tannins, lignins, etc. Wet oxidation (WO) is an appropriate method for the destruction...
198706122 Thermoluminescent dosimeter [Li.sub.2][B.sub.4][O.sub.7]:Mn,Si--a false-dose problem/Termoluminestsentsdosimeeter [Li.sub.2][B.sub.4][O.sub.7]:Mn,Si: pseudodoosi probleem.  
The false-dose effects are investigated in the thermoluminescent detectors of ionizing radiation based on [Li.sub.2][B.sub.4][O.sub.7]:Mn,Si. To reveal the mechanism of daylight sensitivity,...
198706116 Properties of CuIn[S.sub.2] free surface and the effect of conductive polymer layers on these properties/Elektrit juhtiva polumeerkile moju CuIn[S.sub.2] pinna omadustele.  
The influence of thin conductive polymer layers on the surface photovoltage of CuIn[S.sub.2] (CIS) layers prepared using the so-called CISCuT method was studied. The deposition...
198706115 Structure and properties of polyurethane foams obtained from rapeseed oil polyols/Rapsioli poluoolidest saadud poluuretaanvahtude struktuur ja omadused.  
By transesterifying rapeseed oil with triethanolamine or glycerol, polyols with a hydroxyl number of 290-310 mg KOH/g were synthesized. Water-blown rigid polyurethane foams (PUFs) with an...
198706114 Bating of pelts after deliming with peracetic acid/Toornaha pehmendamine parast peraadikhappega tootlemist.  
The bating of pelts after using peracetic acid for deliming was studied. It was established that the commonly used enzymes, which are active in alkaline media, acted weakly in such pelts: they did...
198706113 Synthesis and properties of cross-linked poly(ester urethanes) from poly(lactide) triols and poly(caprolactone) diols/Polu(laktiid)trioolidest ja polu(kaprolaktoon)dioolidest ristseotud polu(esteruretaanide) suntees ja omadused.  
Segmented polyurethanes, whose soft segments were formed by poly(caprolactone) diols with the average molecular weight ([M.sub.n]) ranging from 400 to 2700 and hard segments by poly(lactide)...
198706112 Preparation of chitosan powder and investigation of its properties/Kitosaanpulbri saamine ja selle omaduste uurimine.  
For the preparation of chitosan powder, the thermocatalytic destruction method developed in our earlier works was applied. Chitosan samples obtained from exoskeletons of crustaceans with a...
198706111 Biobased polymer composites for films and coatings/Biopolumeersed komposiidid kiledeks ja kateteks.  
Heterogeneous multicomponent biocomposites were elaborated on the basis of biodegradable polymer polyhydroxybutyrate through incorporation of additives of distinctive chemical nature...
198706110 Activation of cellulose-based carriers with pentaethylenehexamine/Tselluloosipohiste kandjate aktiveerimine pentaetuleenheksamiiniga.  
A method for the activation of a cellulose-based matrix resulting in obtaining active primary amino groups via a long spacer arm was developed. The method is based on coupling...
198706109 Foreword.  
198705958 Extraction and quantification of hybrid carrageenans from the biomass of the red algae Furcellaria lumbricalis and Coccotylus truncatus/Hubriidsete karraginaanide ekstraheerimine ja kvantifitseerimine punavetikate Furcellaria lumbricalis ja Coccotylus truncatus koosluse biomassist.  
The main isolation procedures (extraction, alkali modification, and precipitation) of hybrid carrageenan blend from seaweeds of the Kassari algal stratum (the Baltic Sea, Estonia) were...
198705957 Possibilities of using ozone for the treatment of wastewater from the yeast industry/Osooni kasutamise voimalustest parmitoostuse reovee tootlemisel.  
The purpose of the study was to establish if ozonation can be used to enhance the process of purifying wastewater from the yeast industry. The results of the experiments indicate that ozonation...
198705956 Investigation of different schemes for anaerobic treatment of food industry wastes in Estonia/Eesti toiduainetoostuse reovee kaitluse uuringud erinevate anaeroobsete puhastustehnoloogiatega.  
During the last 5 years, four types of wastewaters from the food industry (yeast, cheese whey, distillery, vegetable oil) with different technological schemes of anaerobic mesophilic digestion...
198705955 Computerized database and software for retrieval, processing, and prognosis of rate and equilibrium constants of chemical reactions/Arvutistatud andmebaas ja tarkvara keemiliste reaktsioonide kiirus- ja tasakaalukonstantide otsimiseks, tootluseks ja prognoosimiseks.  
A computerized database on rate and equilibrium constants of chemical reactions was created. Two versions of the database, one limited to the pKa data, which employs the graphical display of...
198707090 Trends in biomass thermochemical liquefaction: global experience and recent studies in Estonia/Biomassi termokeemiline vedeldamine: maailmapraktika ja hiljutised uuringud Eestis.  
Investigations on thermochemical liquefaction of various renewable resources of biomass carried out in many countries over the world during the last 25 years are shortly reviewed. As a rule, all...
198707089 Separation of calcium and magnesium ions by ion chromatography with a HEMA-EDMA column/Kaltsiumi ja magneesiumi ioonide ioonkromatograafiline lahutamine, kasutades HEMA-EDMA kolonni.  
Properties of HEMA-EDMA weak cation exchange sorbent for ion chromatography are discussed. The column prepared was used for experiments with calcium and magnesium ions in single column...
198707088 Chemically bonded [beta]-cyclodextrin stationary phase for liquid chromatographic separation of substituted aromatic compounds/Asendatud aromaatsete uhendite vedelikkromatograafiline lahutamine [beta]-tsuklodekstriinsel statsionaarsel faasil.  
The effects of the mobile phase composition and the relative position of substituents in aromatic compounds on the retention behaviour on the [beta]-cyclodextrin bonded copolymer of...
198706121 Rate and equilibrium constants for the grignard reaction with alkoxysilanes/Kiirus- ja tasakaalukonstandid Grignardi reaktsioonis alkoksusilaanidega.  
Pseudo-first-order rate constants were determined for the reactions of tetraethoxysilane with n-butylmagnesium chloride solvated with dibutyl ether, diethyl ether, and THF in toluene....
198706120 Comparative calculations of complexation enthalpies between Lewis bases and borontrifluoride/Komplekseerumisentalpiad Lewisi aluste ja [BF.sub.3] vahel: monede arvutuskeemia meetodite vordlus.  
Complexation enthalpies were calculated for complexes of eight Lewis bases--dimethyl ether, diethyl ether, ethyl acetate, trimethylamine, trimethylphosphine, tetrahydropyran, tetrahydrofuran, and...
198706119 Complexed iron and a groundwater treatment technology/Rauakompleksid ja pohjavee tootlemise tehnoloogia.  
The quality parameters and a possible treatment technology of the groundwater in Kogalym (Russian Federation) are discussed. The key problem is stable complexes of di- and trivalent iron and...
198706118 Characterization of water extracts of solid waste generated by oil shale combustion/Polevkivi poletamisel tekkivate tahkete jaatmete vesiekstrakti omadused.  
This study focuses on the behaviour of oil shale combustion ash during water extraction processes. The oil shale ash samples were collected from two different combustion processes in Narva PP....
198706117 Atmospheric pollution in Tallinn: levels of priority pollutants/Ohusaastus Tallinnas, peamiste saasteainete tasemed.  
The levels of priority air pollutants (N[O.sub.x], CO, S[O.sub.2], [O.sub.3], particulate matter) were investigated at three sites in Tallinn (Estonia). The concentration of particles with...
198809249 Self-consistent acidity and basicity scales in nonaqueous solvents/Kooskolalised happelisuse ja aluselisuse skaalad mittevesikeskkondades.  
A method for creating self-consistent acidity and basicity scales in nonaqueous solvents is presented and the current progress in applying such scales to different solvents is reviewed. The method...
198809248 Comparative semiempirical, ab initio, and DFT study of interactions between polypyrrole pentamer dication and some anions/Polupurrooli pentameeri dikatiooni ja moningate anioonide vaheliste interaktsioonide vordlev poolempiiriline, ab initio ja DFT-uurimus.  
Complexes between pyrrole pentameter dication and chloride, bromide, and perchlorate anions were studied using AM1, PM3, HF/3-21+[G.sup.(*)], and B3LYP/6-31+[G.sup.**] methods. The...
198809247 Computational study of cesium cation-humic substance interactions. A neutral analogue ligand molecules approach/Humiinhapete ja tseesiumikatiooni vaheliste interaktsioonide modelleerimine tihedusfunktsionaali-teooria arvutustega neutraalsete mudeluhendite baasil.  
Interactions between the cesium cation ([Cs.sup.+]) and humic substances were studied by the calculations of complexes between [Cs.sup.+] and small ligand molecules mimicking different moieties...
198809246 The pervasive influence of hyperconjugation: the intrinsic (gas phase) acidities of adamantane, adamantanol, and some of their fluorinated derivatives/Huperkonjugatsiooni koikjale tungiv moju: adamantaani, adamantanooli ja nende moningate fluoroderivaatide gaasifaasilised happelisused.  
In this work the results of a computational study at the B3LYP/6-311+G(d,p)//B3LYP/ 6-311+G(d,p) level of the title compounds, the conjugated bases derived therefrom, and some ancillary compounds...
Matches 1 - 50 out of 132 1 2 3 >