scholarly journals The Formation Constants of Some Metal Thiobenzoato- and Thioacetato-Complexes in Dioxane-Water Solvent

1972 ◽  
Vol 45 (1) ◽  
pp. 282-283 ◽  
Author(s):  
Akira Ouchi ◽  
Toshio Takeuchi ◽  
Yoshiaki Takahashi ◽  
Mitsuhisa Nakatani
Keyword(s):  
Formation Constants ◽  
Water Solvent

The solubility of water in low-dielectric solvents

1976 ◽  
Vol 54 (24) ◽  
pp. 3909-3916 ◽  
Author(s):  
Jitka Kirchnerová ◽  
Genille C. B. Cave
Keyword(s):  
Formation Constants ◽  
Solvent Interaction ◽  
Low Dielectric ◽  
Polar Species ◽  
Nonpolar Solvents ◽  
Water Solvent ◽  
Species Formation ◽  
Dispersion Component ◽  
Benzene Toluene ◽  
Polar Interactions

The solubility of water has been measured in several low-dielectric solvents at 25 °C, and the values in the nonpolar solvents are treated by using a modification of the Scatchard–Hildebrand equation. The water–solvent interaction parameter in this equation is represented by a new relationship involving the separate contributions due to dispersion and polar interactions. A new method is given for calculation of the dispersion component of the solubility parameter of a polar species. Formation constants are reported for 1:1 water–solvent complexes in carbon tetrachloride, benzene, toluene, and p-xylene.

scholarly journals Formation Constants of Several Copper(II) Alkylthioacetates in a Dioxane-Water Solvent

1971 ◽  
Vol 44 (12) ◽  
pp. 3461-3462 ◽  
Author(s):  
Akira Ouchi ◽  
Toshio Takeuchi ◽  
Yayoi Ohashi
Keyword(s):  
Formation Constants ◽  
Water Solvent

Formation constants of trivalent lanthanide metal ions and hydrazone β-diketones in 75% dioxane – water solvent

1988 ◽  
Vol 66 (9) ◽  
pp. 2362-2366 ◽  
Author(s):  
Basheir A. El-Shetary ◽  
Shaker L. Stefan ◽  
Mohamed S. Abdel-Moez ◽  
Mahmoud M. Mashaly
Keyword(s):  
Rare Earth ◽  
Ion Exchange ◽  
Rare Earths ◽  
Ionization Constant ◽  
Formation Constants ◽  
Organic Ligands ◽  
Ph Titration ◽  
Water Solvent ◽  
Trivalent Lanthanide ◽  
Lanthanide Metal

A new series of hydrazone β-diketone organic ligands were prepared: 3-(2-acetylphenylhydrazone)pentane-2,4-dione (2-APHA), 2-(2-acetylphenylhydrazone)-1-phenyl-1,3-butane dione (2-APHB), 2-(2-acetylphenylhydrazone)-1,3-diphenyl-1,3-propane dione (2-APHDB), 3-(2-acetylphenylhydrazone) 1,1,1-trifluoropentane-2,4-dione (2-APHTA) and 2-(2-acetyl-phenylhydrazone)-5,5-dimethyl-1,3-cyclohexane dione (2-APHDm). The step formation constants of their 1:1 and 1:2 rare-earth complexes were determined at 30 °C by pH titration in 75% (v/v) dioxane–water solvent. The ionization constant of ligands were also measured. A curious odd–even stability differential was apparent in the (2-APHDm) ligand with the heavier rare earths Gd–Lu. The differential was apparent in both log K1 and log β values and may be sufficient to cause reversal of the usual ion-exchange elution sequence.

Smart Plant Growth Control and Monitoring System for Indoor Hydroponic Farming

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Fina Supegina
Keyword(s):  
Water Level ◽  
Monitoring System ◽  
Growth Control ◽  
Set Point ◽  
Water Solvent ◽  
Growth Room ◽  
Smart Control ◽  
Level Sensor ◽  
Planting Method ◽  
Hydroponic Growth

Hydroponics is one of planting method that use water as a medium of plants growth, in this technique, mineral solution added into the water solvent, allowing the nutrient uptake process by the plants.  Farming by hydroponic method must pay attention to the following parameters namely, temperature, humidity, the level of water needs and nutrients and also the level of sunlight need for photosynthesis process.  This research used hydroponic technique in hydroponic growth room, and  there is a LED growth light as an alternate of sunlight, due to this room is closed without sunlight.  There are outputs displayed in monitoring system namely, temperature sensor, humidity sensor, ultrasound sensor to detect height of the plant and water level sensor to measured height of the water as a medium of the plant.  Results of measured sensor in hydroponic growth room explained as the following:  fan cooler worked when temperature , and humidity  .  Water pump worked when water level is less than 50% accordance set point.  Control on LED Growth Light and LED Bulb when LDR sensor reached set point > 500 in bright condition, and < 500 in dark condition respectively. The average of Time update/received data in thing speak web is 2.4 second. Keywords: Smart Control, Hydroponic, IoT, Monitoring

Aktivitas Antihiperkolesterolemia Ekstrak Etanol Daun Stevia Rebaudiana Bertoni Pada Tikus Putih Jantan

2020 ◽  
Vol 2 (1) ◽  
pp. 11-20
Author(s):  
Meta Kartika Untari ◽  
Ganet Elo Pramukantoro
Keyword(s):  
Total Cholesterol ◽  
Total Cholesterol Level ◽  
Density Lipoprotein ◽  
Stevia Rebaudiana ◽  
Negative Control ◽  
Stevia Rebaudiana Bertoni ◽  
Cholesterol Levels ◽  
Water Solvent ◽  
White Rats ◽  
Group I

Hypercholesterolemia is a state of increased levels of LDL (Low Density Lipoprotein) and total cholesterol in the plasma. Stevia leaves have benefits to overcome hypercholesterolemia. The aimed of this study was to obtain ethanol extracts of Stevia rebaudiana Bertoni leaves which have activity to reduce total cholesterol levels in patients with hypercholesterolemia with effective doses. The method that will be carried out to achieve this goal was to make extracts by maceration of Stevia rebaudiana Bertoni leaf powder using a water solvent for 5 days. Testing antihypercholesterolemia activity by giving treatment to 20 male white rats. Rats were divided into 5 treatment groups. Group I was negative control, II was simvastatin control, III extract was 30 mg / 200 g BW, IV extract was 60 mg / 200 g BW, V extract was 120 mg / 200 g BW. The mice were induced by propylthiouracil 12.5 mg / day and high-fat feed for 21 days, after which the rats were given the test for 14 days. Cholesterol levels were measured on days 0, 21st and 28th. The method of determining cholesterol levels uses the Easy Touch tool. On the 35th day, a total cholesterol level was examined and data analysis was performed. The results showed that the ethanol extract of stevia leaves had antihypercholesterolemia activity, extract dose of 30 mg / 200 g BW had antihypercholesterolemia activity which was equivalent to simvastatin.

Formation of CT complexes and electron transfer from excited molecules of anthracene derivatives to methylviologen in aqueous and micellar media

1987 ◽  
Vol 52 (7) ◽  
pp. 1658-1665
Author(s):  
Viktor Řehák ◽  
Jana Boledovičová
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Formation Constants ◽  
Dynamic Quenching ◽  
Micellar Media ◽  
Complex Formation Constants ◽  
Anthracene Derivatives ◽  
Ct Complexes

Disodium 1,5- and 1,8-anthracenedisulphonate (ADS) and 9-acetylanthracene form coloured CT complexes with methylviologen (MV2+) in aqueous and micellar media. The complex formation constants and molar absorptivities were determined by the Benesi-Hildebrandt method. In the fluorescence quenching, its static component plays the major role. The dynamic quenching component is determined by the rate constant of electron transfer from the S1 state of ADS to MV2+.

Equilibrium Studies of Binary and Ternary Complexes of Palladium(II) Involving Amino Acids

1993 ◽  
Vol 58 (5) ◽  
pp. 1103-1108 ◽  
Author(s):  
Mohamed M. Shoukry ◽  
Eman M. Shoukry
Keyword(s):  
Amino Acids ◽  
Relative Stability ◽  
Ternary Complex ◽  
Formation Constants ◽  
Ternary Complexes ◽  
Conductivity Measurements ◽  
Equilibrium Studies ◽  
Binary And Ternary Complexes ◽  
Binary Complexes

The formation constants of the binary and ternary complexes of palladium(II) with diethylenetriamine and amino acids as ligands have been determined potentiometrically at 25 °C in 0.1 M NaNO3 solution. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of ∆logK values. The mode of chelation was ascertained by conductivity measurements.

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