197,281 Works

Thin layer chromatographic separation of anions by naturally occurring mixed oxides impregnated plates

, Alok Kumar Mukhopadhyaya &
Department of Chemistry, Vidyasagar College, Suri-731 101, India Department of E.T.C.E., Jadavpur University, Kolkata-700 032, India Manuscript received 17 July 2000, revised 23 February 2001, accepted 31 March 2001 A naturally occurring clay mineral of the mixed oxides of silicon, aluminium, iron and titanium of composition SiO2, 45.70; Al2O3, 36.60; TiO2, 2.50; Fe2O3 , 1.21%, has been processed. Systematic separation of different anions by TLC plates coated with this natural inorganic ion exchanger is...

THE EFFECT OF H-ION CONCENTRATION ON THE VISCOSITY CHANGES IN THORUM PHOSPHATE GEL-FORMING MIXTURES DURING SETTING

The investigation deals with the measurement of changes in viscosity taking place during the setting of thorium phosphate gel-forming mixtures of different pH. It has been found that the rate of change of viscosity with time increases when the pH is reduced up to a certain value ; further reduction in pH causes a decrease Two sets of straight lines are obtained when values of log (\(\eta-\eta_o\)) are plotted against t, one set corresponding to...

THE MECHANISM OF THE ACTION OF CHARCOAL ON POTASSIUM NITRATE. PART II. STUDY OF THE REACTIONS

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A detailed study of the action of charcoal on KNO3 and of the influence of temperature on the interaction has been undertaken. Evidences from all the experiments show that charcoal acts in two different stages (i) 4KNO3+2C→4KNO2 +2CO2 and (ii) 4KNO2+3C→2K2CO3+CO2+2N1, These are followed under suitable conditions by the flash reaction : (iii) KNO3+KNO2+2C→K2CO3+ CO2+N2. Reaction (ii) is the major reaction in the interaction and proceeds through the dissociation of the potassium nitrite, produced in...

DEVELOPMENT OF GREEN TEA AQUEOUS EXTRACT LOADED CHITOSAN MEMBRANE FOR WOUND HEALING AND IT'S EFFECT IN CONTROLLING NOSOCOMIAL INFECTION.

Shilpa J*
Tissue regeneration supported by biocompatible scaffolds faces delay in regeneration due to Staphylococcal attack. This study was conducted to develop a chitosan based tissue regeneration scaffold with antistaphylococcal property. Chitosan membrane loaded with different concentrations of green tea aqueous extracts {0.016mg (GTM 1), 0.02mg (GTM 2), 0.1mg (GTM 3), 0.5mg (GTM 4), 1.0mg (GTM 5), 1.5mg (GTM 6) & 2.0mg (GTM 7) extract/0.86mg membrane} were prepared and morphological properties, degradation and antistaphylococcal activity were examined....

PYRONES AND RELATED COMPOUNDS. PART II. A NEW REACTION PRODUCT OF ACETONE DICARBOXYLIC ACID AND ACETIC ANHYDRIDE

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By the action of four molecules of acetic anhydride on one molecule of acetone dicarboxylic acid a new acid. C9H6O5, is obtained. to which a tentative structure is assigned.

PYRONES AND RELATED COMPOUNDS. PART II. A NEW REACTION PRODUCT OF ACETONE DICARBOXYLIC ACID AND ACETIC ANHYDRIDE

, &
By the action of four molecules of acetic anhydride on one molecule of acetone dicarboxylic acid a new acid. C9H6O5, is obtained. to which a tentative structure is assigned.

ACTION OF SODIUM ON ETHYL ,β-METHYLBUTANE-αβ8-TRICARBOXYLATE PART I

ACTION OF SODIUM ON ETHYL ,β-METHYLBUTANE-αβ8-TRICARBOXYLATE PART I

A Corpus Based Diachronic Study Of Verb Complementation Pattern In Pakistani English

Muhammad Farukh Arslan, , & Hira Haroon
This study is about the verb complementation pattern of Pakistani English. Corpus based approach was adopted to conduct the diachronic study. Corpus from 1947 to 1986 was collected and divided into the four decades. Main concern of the study was to conduct the comparative study about the use of (to infinitive) and gerund as verb complement and to see the change with the passage of time about these complementation patterns. Twenty verbs were selected with...

R. Venkatasamy (2018). Major and Minor Timbers of Kenya and their Commercial Uses

A compilation of the major commercial timber species of Kenya, their properties and uses.

PHOTOCHEMICAL STUDIES IN GELS. PART I. THE REDUCTION OF FERRIC CHLORIDE BY MANDELIC ACID IN LIGHT OF DIFFERENT FREQUENCIES IN THORIUM PHOSPHATE GEL AS A SOLVENT MEDIUM

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The kinetics of the reduction of ferric chloride by mandelic add in light of frequencies 366 and 436 μμ in transparent and colourless thorium phosphate gel have been studied. The reaction was found to be zero molecular and the velocity constant was found to increase with increasing concentrations of ferric chloride and in fact \({\bigtriangleup x \over \bigtriangleup t}/I_{abc}\) was found to remain constant for a particular wave-length which increase with increased in the magnitude...

Russia and the rise of Islamic terrorism in Sub-Saharan Africa

Dirk Kohnert
ABSTRACT & RÉSUMÉ & ZUSAMMENFASSUNG : Russia and China challenge the liberal order and rule of law on a global and regional level. The Trump administration has facilitated the support of the move away from the liberal international order and the "Westphalian" system of states that America had defended for centuries. Extremism is thriving around the world, including in sub-Saharan Africa, fuelled by the aftermath of colonialism, poverty and Islamist ideologies. Regions with limited statehood...

SUCCINIC ACID DEHYDROGENASE FROM CUCUMBER SEEEDS

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The preparation and properties of succinic acid dehydrogenase from cucumber seeds are described. Methylene blue cannot serve as hydrogen acceptor, but the enzyme is a perfect dehydrogenase as it can use a dye of higher pH(2 :6-dichlorophenolindophenol blue) as hydrogen acceptor. Narcotics inhibit the dehydrogenating property of the enzyme whereas potassium cyanide inhibits the power of utilising oxygen as hydrogen acceptor. Sodium fluoried inhibits the dehydrogenating factor considerably and the oxidise factor feebly. Pyrophosphate is...

RELATIONS BETWEEN CHEMICAL ACTIVITY AND ABSORPTION IN THE ULTRAVIOLET OF CERTAIN ORGANIC MOLECULES. PART V. THE INTERACTION OF ATOXYL WITH THE HALOGEN DERIVATIVES OF SUBSTITUTED AMIDES OF MALONIC ACID

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Atoxyl is found to be inactive towards chloro derivatives of the substituted amides of malonic acid. It easily reacts with the bromo derivatives.

\"Data from: A Metadata Driven Process for Assessing Stability and Reusability of Software Systems\"

Bilal Mehboob &
Measuring and estimating the reusability and ease of reuse of software components are important steps towards finding reusable candidates. As a result, plenty of researches have attempted to evaluate the extent to which a software artifact is reusable. Prior works follow code-based approaches. However with the popularity of software repositories, researchers have started to investigate how metadata related to the process and product of the software can be utilized to enrich their techniques. So this...

A VISCOMETRIC METHOD FOR STUDYING THE KINETICS OF ALCOHOLYSIS OF ESTERS

Using a modification of Scarpa's method. satisfactory values for the unimolecular-constants are. obtained for the alcoholysis of methyl acetate by three alcohols in the presence of hydrochloric acid at 25° and 30°, by following the progress of the change by a determination of the viscosity of the medium. It is considered that the procedure can be of general use for a study of the kinetics of changes in liquid media.

SUCCINIC ACID DEHYDROGENASE FROM CUCUMBER SEEEDS

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The preparation and properties of succinic acid dehydrogenase from cucumber seeds are described. Methylene blue cannot serve as hydrogen acceptor, but the enzyme is a perfect dehydrogenase as it can use a dye of higher pH(2 :6-dichlorophenolindophenol blue) as hydrogen acceptor. Narcotics inhibit the dehydrogenating property of the enzyme whereas potassium cyanide inhibits the power of utilising oxygen as hydrogen acceptor. Sodium fluoried inhibits the dehydrogenating factor considerably and the oxidise factor feebly. Pyrophosphate is...

PHYSICO-CHEMICAL STUDIES OF COMPLEX FORMATION BETWEEN MOLYBDIC AND TARTARIC ACIDS. PART II. STUDIES ON THE OPTICAL ROTATION PROPERTIES OF MOLYBDOTARTARIC ACID COMPLEX IN PRESENCE OF DIFFERENT BASES, ACIDS AND ALCOHOLS

The stability of complex molybdotartaric acid in different pH and in solutions containing suitable organic acids, alcohols and phenols which lire expected to form similar co-ordina-tion complex as tartaric acid, has been examined by measuring optical rotatory power. The change of the rotation values of such complex solution has been associated mainly with the preferential formation of the undissociated acid or its ions between pH limits 1.0 and 4 2 and the complex breaks beyond...

RELATIONS BETWEEN CHEMICAL ACTIVITY AND ABSORPTION IN THE ULTRAVIOLET OF CERTAIN ORGANIC MOLECULES. PART VII. ABSORPTION SPECTRA OF THE AMIDES OF ACETOACETIC ACID

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The following substances have been examined for the absorption spectra in the ultraviolet in aqueous solution : (j) acetoacetanilide, (s) acetoacet-o-tolylamide, (3) acetoecet-p-tolylamide, (4) acetoacet-1: 3 : 4-xylylamide, (5) acetoacet-α-naphthylamide and (6) acetoacet-β-naphthylamide.

Structure-based identification of naphthoquinones and derivatives as novel inhibitors of main protease (Mpro) and papain-like protease (PLpro) of SARS-CoV-2

Lucianna H. Santos, Thales Kronenberger, Antti Poso & Rafaela Salgado Ferreira
Mmolecular dynamics simulation data of Mpro and PLpro proteases with the screened and tested inhibitors, in explicit solvent systems, description regarding execution is provided in the respective manuscript. Simulation systems are coded as follow: 773 - Mpro 5R82 dimer bound to compound 415 776 - Mpro 5R82 dimer bound to compound 392 854- PLpro 7LBR with XR8 co-crystallized ligand) 858- PLpro 7LBR with ligand 189 861- PLpro 7LBR with ligand 195 Virtual screening raw data...

TRANSPORT NUMBERS OF AQUEOUS SILVER NITRATE IN PRESENCE OF SUCROSE AND MEASUREMENTS OF CONDUCTIVITY, VISCOSITY. DENSITY AND REFRACTIVITY

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Transport number measurements have been made at 25º for aqueous silver nitrate (M/18) in presence of varying proportions of sucrose. The minimum in the transport number-sucrose concentration curse has been attributed to ale changes in the degree of hydration of sucrose. Data are also given for the conductivity. viscosity, density and refractivity of the corresponding solutions.

EVOLUÇÃO HISTÓRICA E DISTINÇÃO ENTRE CONTRABANDO E DESCAMINHO E O PRINCÍPIO DA INSIGNIFICÂNCIA

Bruno Costa Campos & Lorena Menezes De Oliveira
O presente artigo tem como objetivo explicitar a evolução histórica e a distinção do crime de contrabando e descaminho tipificados respectivamente no artigo 334 e 334-A do Código Penal brasileiro, esclarecer o princípio da insignificância aplicado ao delito tipificado no art.334, no valor de até R$ 20.000,00 bem como arrazoar a reincidência nesses casos. Tratase de crimes que deveriam estar definidos como crimes Tributários, contudo são previstos na lei penal no capitulo dos crimes contra...

LEGAL ASPECTS OF IRON ORE PROCESSING IN THE KRYVYI RIH IRON ORE BASIN

Anatoliy Kostruba
The current version of the Tax Code allows for misinterpretation of the interpretation of the term "primary processing of mineral resources". In particular, the tax authorities believe that the primary processing of mineral raw materials includes magnetite concentrate, which in this case is subject to taxation. That is, a number of mining and processing enterprises have faced the problem of double taxation, which threatens significant financial losses. Accordingly, this led to the choice of topic...

ON THE PHOTOBROMINATION OF CINNAMIC ACID IN ULTRAVIOLET LIGHT OF 254μμ.

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The kinetics and mechanism of the bromination of cinnamic acid in ultraviolet light of 254μμ in solution of carbon tetrachloride have been studied in details. Results which have been found are quite different from those found with visible light by various workers. The reaction is unimolecular with respect to bromine as well as with respect to cinnamic acid. The velocity constant is directly proportional to the intensity of radiation absorbed by cinnamic acid and is...

Performance Evaluation of Genetic Algorithm Selection Methods in Outlier Detection: Further Analysis

Ayodeji Oyeyinka EFUNBOADE, &
Feature selection is very crucial in the activities of soft computing algorithms for quality, precision and accuracy. This paper evaluates the performance of some feature selection methods of Genetic Algorithm in outlier detection on fingerprint images. Roulette wheel, Rank and Tournament methods were considered for feature selection and selected features were enhanced using h istogram equalization. K - nearest neighbor algorithm was employed for classification to detect outliers. The implementation of the experiment was carried...

NEXUS OF UNIVERSITY AND COMMUNITY: TRANSFORMATIVE REFLECTION OF STUDENT VOLUNTEERS

To connect the university and community, this paper aimed to describe how the student volunteers gave meaning to their participation in the ALS Assistantship Community Extension program. Anchored on Edmund Husserls phenomenology, the researchers explored the experiences of 8 student volunteers, specifically the student interns, through their written transformative reflection journals. The result revealed 50 significant statements that generated 5 themes. These themes emphasize the experience of student volunteers in their participation in the community...

Registration Year

  • 2022
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Affiliations

  • Polytechnic Institute of Porto
    120
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    117
  • Chuvash State Agricultural Academy
    58
  • Autonomous University of Zacatecas
    52
  • University of Technology of Compiègne
    45
  • University of Tampa
    35
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    33
  • University of Virginia
    30
  • Leibniz University Hannover
    30
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    28