scholarly journals Studies on Cyanex-272 Complexes of Mg (II), Ca (II) and Fe (III)

1970 ◽  
Vol 42 (4) ◽  
pp. 475-482 ◽  
Author(s):  
M Badrul Islam ◽  
M Zahurul Haque ◽  
N Shamsul Islam
Keyword(s):  
Key Words ◽  
Magnetic Measurements ◽  
Phosphinic Acid ◽  
Chemical Properties ◽  
Decomposition Temperature ◽  
Complex Compounds ◽  
The Other ◽  
Spectral Studies ◽  
Cyanex 272 ◽  
Physico Chemical

Certain complex compounds were synthesized by the interaction of Mg(II), Ca(II) and Fe(III) halides with the solvent extracting reagent, Cyanex-272 i.e. bis (2,4,4- trimethylpentyl) phosphinic acid as ligand. All the prepared complexes have been characterized on the basis of their molar masses, conductivity, magnetic measurements and infrared and electronic spectral studies. The other physico-chemical properties e.g. colour, decomposition temperature have also been ascertained. Key words: Chanex-272 Bangladesh J. Sci. Ind. Res. 42(4), 475-482, 2007

scholarly journals Physico-chemical characterization and biological screening of metal complexes with Cyanex 301

1970 ◽  
Vol 34 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Tarun Kumar Pal ◽  
Md Ashraful Alam ◽  
Suchitra Rani Paul
Keyword(s):  
Metal Complexes ◽  
Magnetic Measurements ◽  
Chemical Characterization ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Antibacterial And Antifungal Activities ◽  
Physico Chemical ◽  
Dithiophosphinic Acid ◽  
Cyanex 301 ◽  
Antibacterial And Antifungal

New metal complexes of Mg(II), VO(II), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Pd(II) with cyanex 301(L) i.e., bis(2,4,4-trimethylpentyl) dithiophosphinic acid were synthesized. The complexes have been characterized by elemental analysis, molar conductivity, molecular mass determination, magnetic measurements, infrared and electronic spectral studies. The prepared metal complexes have the compositions: 2. [MgL2].H2O, 3. [VOL2], 4. K[MnL3].H2O, 5. [FeL3], 6. K[CoL3].H2O, 7. K[NiL3], 8. K[CuL3] and 9. [PdL2]. The complexes 2, 3 and 9 are assumed to have tetrahedral, square pyramidal and square planar geometries, respectively but the complexes 4 - 8 are octahedral based on experimental data. From magnetic measurements the complexes 2 and 9 are found to be diamagnetic and others are paramagnetic. Measured molar conductance showed that the complexes 2, 3, 5 and 9 are non-electrolytes and rest are electrolytes. Besides, some complexes have shown good antibacterial and antifungal activities. Key words: Cyanex 301; Antibacterial; Antifungal; DMSO; Bis (2, 4, 4-trimethylpentyl) dithiophosphinic acid DOI: 10.3329/jbas.v34i2.6859Journal of Bangladesh Academy of Sciences, Vol. 34, No. 2, 153-161, 2010

scholarly journals Towards a Conceptual Understanding of Groundwater Ecology

2012 ◽  
Vol 1 (3) ◽  
pp. 493
Author(s):  
H.O Nwankwoala
Keyword(s):  
Conceptual Understanding ◽  
Chemical Properties ◽  
The Other ◽  
Ecological Communities ◽  
Groundwater Hydrology ◽  
Future Perspectives ◽  
Natural Ecosystems ◽  
Ecological Processes ◽  
Physico Chemical ◽  
Groundwater Ecology

In recent times, ecohydrology and hydroecology are making a mark on theenvironmental agenda, as evidenced by the proliferation of these terms in theacademic literature. There is an increasing recognition that groundwater is essentialto many ecological communities. Surface ecological processes (such asevapotranspiration) significantly impact hydrological responses and relatedhydrochemical function. Thus, the relation of groundwater hydrology to patternsand processes in ecology is a ‘two-way street’ where understanding the feedback ofone to the other serves as a powerful lens through which to evaluate and explainthe functioning of natural ecosystems. Influxes of groundwater to lakes, rivers, andwetlands can change whole-system physico-chemical properties such astemperature and salinity, while also providing more subtle influences onmicroenvironments and their ecological processes. The recognition of thesignificance and power of this tandem has not always been followed with effectiveinterdisciplinary science. The ecological, hydrological, and physico-chemical linksbetween groundwater, surface water and associated ecosystems are seldom fullyunderstood even though true characterization and wise management will require amultidisciplinary approach. This means biologists need to understand theimportance of magnitude and timing of groundwater flows for their system, whichrequires the skills of hydrogeologists to achieve. Hydrogeologists, in turn, mustunderstand how and why groundwater influences ecological processes so that theirexpertise is brought to bear at a scale commensurate to the ecological researchquestion. In this paper therefore, an overview of general concepts, research effortsand future perspectives are presented. More importantly, the paper asserts that it isnot simply the integration of hydrology and ecology that will determine the futureprospects for ecohydrology/hydroecology, but the way in which this integrativescience is conducted.

scholarly journals Water Quality of Major Ponds of Comilla Town

1970 ◽  
Vol 45 (1) ◽  
pp. 57-62
Author(s):  
SZKM Shamsad ◽  
Md Didar-Ul-Alam ◽  
ASM Shamsuddoha ◽  
Mohammad Naushad Alam
Keyword(s):  
Water Quality ◽  
Community Health ◽  
Key Words ◽  
Water Samples ◽  
Chemical Constituents ◽  
Chemical Properties ◽  
Organic Wastes ◽  
Dry Period ◽  
Physico Chemical

Some important physico-chemical properties of water of major ponds of Comilla Town were studied to evaluate the water quality. Eight water samples were collected during the dry period (March 2005) from eight major ponds of Comilla Town (Ranir dighi, Mandir dighi, Nanuar dighi, Fauzdari dighi, Modina dighi, Dargabari dighi, Darma Sagar and Thakurpara). The result revealed that all the chemical constituents, except a few, are beyond the recommended limit for different uses. Higher value of pH (at Dargabari dighi, Darma Sagar dighi), OM (at Thakurpara dighi, Fauzdari dighi and Modina dighi), NH4+ concentration (at Ranir dighi, Mandir Dighi, Fauzdari dighi, Modina dighi and Dargabari dighi), and lower value of DO (at Fauzdari dighi and Modina dighi) may due to continuous disposal of kitchen wastes, organic wastes, sewage running and fall of twigs as well as extensive used for bathing, washing cloths and utensils etc. All indicate eutrophication and affect community health and hygiene and also create aesthetic problem in the locality. Key words: Ponds; Comilla District; Water quality Eutrophication DOI: 10.3329/bjsir.v45i1.5184 Bangladesh J. Sci. Ind. Res. 45(1), 57-62, 2010

Scanning Electronic Microscopy Study of New Theophyline Compounds with Metallic Ions

2008 ◽  
Vol 59 (5) ◽  
Author(s):  
Eleonora Marian ◽  
Tunde Jurca ◽  
Florin Banica ◽  
Bogdan Tita ◽  
Dumitru Tita
Keyword(s):  
Chemical Properties ◽  
Microscopy Study ◽  
Complex Compounds ◽  
Metallic Ions ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Transitional Metals ◽  
Energy Capture ◽  
Elementary Analysis ◽  
Physico Chemical

Although they represent mere 3% of the human body, the metallic ions (especially those of the transitional metals from 3d series), under the form of some natural chelate compounds, they intervene in all the fundamental biologic processes, solar energy capture, photosynthesis, oxygen and nitrogen fixation and transportation, coordination of all metabolic reactions and controlled discharge of the energy in the biologic systems. Furthermore, the formation of complex compounds has implications in the explanation of some biological processes or pathological states and may constitute models for the study of the drugs� pharmaco-dynamic effects. In this study is presented the manner in which are prepared three theophyline compounds with transitional metal ions, their physico-chemical properties, the results of the elementary analysis, as well as the examination by scanning electronic microscopy of these compounds particles form.

scholarly journals Synthesis and investigation of physico-chemical properties of dicationic ionic liquids

2018 ◽  
Vol 5 (12) ◽  
pp. 181230 ◽  
Author(s):  
Yi-Xin Sun ◽  
Ying-Ying Wang ◽  
Bing-Bing Shen ◽  
Bi-Xian Zhang ◽  
Xiao-Mei Hu
Keyword(s):  
Ionic Liquids ◽  
Heterogeneous System ◽  
Room Temperature ◽  
Chemical Properties ◽  
Homogeneous System ◽  
The Other ◽  
Melting Points ◽  
Good Solubility ◽  
Physico Chemical ◽  
Dicationic Ionic Liquids

A series of dicationic ionic liquids (ILs) including [C 4 (MIM) 2 ][PF 6 ] 2 , [C 5 (MIM) 2 ][PF 6 ] 2 , [C 6 (MIM) 2 ][PF 6 ] 2 and [C 4 (PYR) 2 ][PF 6 ] 2 were synthesized. Their thermal stability and melting points were analysed. It was found that dicationic ILs presented important implications in the design of homogeneous and heterogeneous system with water. A homogeneous system of dicationic ILs with water could be formed at a relatively high temperature and then a heterogeneous system was formed when the solution was cooled to a low temperature. The ILs recovered by altering the temperature were obtained in high percentage yields of [C 4 (MIM) 2 ][PF 6 ] 2 (97.6%), [C 5 (MIM) 2 ][PF 6 ] 2 (97.3%), [C 6 (MIM) 2 ][PF 6 ] 2 (98.0%) and [C 4 (PYR) 2 ][PF 6 ] 2 (94.2%). On the other hand, [C 4 (MIM) 2 ][PF 6 ] 2 and [C 5 (MIM) 2 ][PF 6 ] 2 exhibited good solubility in acetonitrile and acetone. A homogeneous system could be achieved with imidazolium-based ILs with a relatively low amount of water and acetonitrile at room temperature. All of the properties of dicationic ILs have a strong correlation with the nature of dications, the linkage chain and the symmetry of dications. Dicationic ILs may provide a new opportunity for some specific applications in order to enable the effective separation and isolation of products.

scholarly journals Profiling and analysis of chemical compounds using pointwise mutual information

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
I. Čmelo ◽  
M. Voršilák ◽  
D. Svozil
Keyword(s):  
Random Forest ◽  
Mutual Information ◽  
Structural Feature ◽  
Chemical Properties ◽  
Structural Features ◽  
Complex Compounds ◽  
Physico Chemical ◽  
Synthetic Accessibility ◽  
Measure Of Association ◽  
Pointwise Mutual Information

AbstractPointwise mutual information (PMI) is a measure of association used in information theory. In this paper, PMI is used to characterize several publicly available databases (DrugBank, ChEMBL, PubChem and ZINC) in terms of association strength between compound structural features resulting in database PMI interrelation profiles. As structural features, substructure fragments obtained by coding individual compounds as MACCS, PubChemKey and ECFP fingerprints are used. The analysis of publicly available databases reveals, in accord with other studies, unusual properties of DrugBank compounds which further confirms the validity of PMI profiling approach. Z-standardized relative feature tightness (ZRFT), a PMI-derived measure that quantifies how well the given compound’s feature combinations fit these in a particular compound set, is applied for the analysis of compound synthetic accessibility (SA), as well as for the classification of compounds as easy (ES) and hard (HS) to synthesize. ZRFT value distributions are compared with these of SYBA and SAScore. The analysis of ZRFT values of structurally complex compounds in the SAVI database reveals oligopeptide structures that are mispredicted by SAScore as HS, while correctly predicted by ZRFT and SYBA as ES. Compared to SAScore, SYBA and random forest, ZRFT predictions are less accurate, though by a narrow margin (AccZRFT = 94.5%, AccSYBA = 98.8%, AccSAScore = 99.0%, AccRF = 97.3%). However, ZRFT ability to distinguish between ES and HS compounds is surprisingly high considering that while SYBA, SAScore and random forest are dedicated SA models, ZRFT is a generic measurement that merely quantifies the strength of interrelations between structural feature pairs. The results presented in the current work indicate that structural feature co-occurrence, quantified by PMI or ZRFT, contains a significant amount of information relevant to physico-chemical properties of organic compounds.

scholarly journals Dynamics of the Physico-chemical Properties of Sediments along the Bandama River in the Department of Niakaramadougou, Northern Côte d’Ivoire

2019 ◽  
pp. 739-750
Author(s):  
N’Doufou Gnosseith Huberson Claver ◽  
Kouadio Koffi Hypolithe ◽  
De Lasm Omer Zephir ◽  
Zogoury Eddie Constant Fabrice
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Chemical Properties ◽  
Statistical Analyses ◽  
The Other ◽  
Eastern Shore ◽  
Chemical Parameters ◽  
Sediment Analysis ◽  
Granulometric Analysis ◽  
Physico Chemical

This work focuses on analyzing of physico-chemical properties of sediment affected by frequent floods along the eastern shore of the Bandama River in the department of Niakaramadougou. Sampling was from 4 excavated graves at two positions of studied area, one near the stream and the other one far away from the stream.. Samples collected were analyzed, including texture with granulometric analysis made by the Robinson pipette, and standard sediment analysis methods for measuring organic carbon (OC), nitrogen (N), and other chemical properties including pH, organic matter (OM), and C/N ratio. Statistical analyses were carried out to assess the differences between the physico-chemical parameters at different sampling areas. Differences are significant when comparing areas that are highly affected by floods and areas that are less affected by floods, especially for concentrations of OM, OC and nitrogen. Results show that successive floods are influencing directly the dynamic of physico-chemical properties of the sediments along the shore.

scholarly journals A COMPARATIVE PHARMACEUTICO ANALYTICAL STUDY OF YASTIMADHU KSHEERAPAKOTTHA GHRITHA AND YASTIMADHU GHRITHA

2021 ◽  
pp. 129-132
Author(s):  
Dr.Ramakiran ◽  
Dr.Harshitha M
Keyword(s):  
Refractive Index ◽  
Qualitative Analysis ◽  
Clinical Research ◽  
Key Words ◽  
Analytical Study ◽  
Drug Research ◽  
Chemical Properties ◽  
Special Property ◽  
Saponification Value ◽  
Physico Chemical

Drug research is an important part of pharmaceutical field especially in Ayurveda pharmaceutics to revalidate and establish various formulations. Ghritha kalpana has got prime importance due to a special property of Ghritha i.e Samskarasyanuvartana. Ksheera ghritha and Ghritha are explained with different properties in Ayurveda classics. Present study is to compare between Yastimadhu Ksheera ghritha and classical Yastimadhu ghritha by organoleptic and analytical parameters. Ksheera ghritha procedure may bypass the long procedure , maximise the percentage of extract in Ghritha. Reference of Ksheera ghritha is available in various classical texts like Sushruta samhitha1 etc. Ksheera ghritha said to have properties like Netrya , Sangrahi , Rakthapitta hara etc. Ksheera ghritha of Yastimadhu prepared by preparing Ksheerapaka taken as G1 and Yastimadhu Ghritha prepared by normal classical way taken as G2. Analytical study for standardization of both samples were carried out on the basis of classically illustrated organoleptic tests and modern parameters of physico-chemical properties like LOD, Refractive index , Saponification value etc., and TLC done for qualitative analysis. By this study the major difference between Ksheera ghritha and Ghritha are established giving further scope for clinical research to establish efficacy of same. KEY WORDS : Ayurveda, Ghritha, Yastimadhu, Ksheerapaka.

scholarly journals Antropogenic transformation features of dark grey podzolik light loamy soils of Goshchanske plateu

2013 ◽  
pp. 273-281
Author(s):  
Bohdan Svydnytskyi ◽  
Maria Paseka
Keyword(s):  
Soil Erosion ◽  
Key Words ◽  
Morphological Traits ◽  
Chemical Properties ◽  
Physico Chemical ◽  
Structural Coefficient

The task of soil erosion degradation and melioration cultivation of dark grey podzolic light loamy soils of Goshchanske plateu was lighted. Detailed description of changes in their morphological traits physical and physico-chemical properties has been conducted. Key words: degradation, cultivation, anthropogenius transformation, melioration, gleization, drainage, key plats, structural coefficient, water-resistant aggregates.

scholarly journals Complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand formed by condensation reaction of isatin with glutamic acid

2020 ◽  
Vol 45 (3) ◽  
pp. 12-27
Author(s):  
Wiesława Ferenc ◽  
Dariusz Osypiuk ◽  
Jan Sarzyński ◽  
Halina Głuchowska
Keyword(s):  
Glutamic Acid ◽  
Metal Ion ◽  
Magnetic Measurements ◽  
Condensation Reaction ◽  
Chemical Properties ◽  
Ligand Field ◽  
Decomposition Products ◽  
Carboxylate Groups ◽  
Physico Chemical ◽  
Crystalline Forms

The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand (H2L=C13H12N2O5) formed by condensation reaction of isatin and glutamic acid were synthesized. Their physico-chemical properties were characterized using elemental analysis, XRF, XRD, FTIR, TG–DSC and TG–FTIR methods and magnetic measurements (Gouy’s and SQUID-VSM methods). The complexes were obtained in crystalline forms (monoclinic or triclinic) with the formulae: M(LH)2·nH2O for Mn(II), Ni(II) and Zn(II) and ML·nH2O for Co(II) and Cu(II), where LH=C13H11N2O5–, L-=C13H10N2O52–, n = 1 for Mn(II), Cu(II) and Zn(II), n = 2 for Co(II) and n = 3 for Ni(II). In air at 293–1173 K they decompose in three steps forming finally the oxides of the appropriate metals. The gaseous decomposition products were identified as: H2O, CO2, CO, hydrocarbons and N2O. The magnetic moment values for complexes (except Zn(II) complex) show their paramagnetic properties with the ferro- and antiferromagnetic interactions between central ions. The compounds of Mn(II) and Co(II) are high spin complexes with weak ligand field. In Co(II) and Cu(II) complexes two carboxylate groups take part in the metal ion coordination while in those of Mn(II), Ni(II) and Zn(II) only one carboxylate anion coordinates to central ion.

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