Water crystals

Red lava rock is available in nature and is formed from volcanic eruptions. Volcanic rocks are composed of oxides of diverse metals and have considerable porosity. In this study, lava rock powder was ground to a specific size and dried to test its ability to adsorb heavy metals in water. The morphology of the stone powder was observed to show crystals of 100–300 nm in size clumping into particles of a few μm.

6p vikwong 29-09-2024 3 1   Download

Water is an important resource for human life. The lack of clean water in the world now becomes more serious. As a result, seawater desalination to produce fresh water is becoming indispensable. In recent years, hydrate-based desalination is a potential solution for the drinking water shortage issue. Recently, Cyclopentane (CP) is used as a hydrate former for desalination process via crystallization at low temperature and atmospheric pressure.

5p vikwong 29-09-2024 3 1   Download

Depending on the origin of the water and the formation process, crystals are divided into three main types: snow crystals, ice crystals, and water crystals. From the shape of the crystal, the purity and the texture level are clearly reflected, then it enables us to assess the quality of the water.

63p mudbound 10-12-2021 18 3   Download

Objective of the thesis: Successfully fabricate Cu2O thin film having good crystal structure. Fabricate layers protecting Cu2O electrode from photocorrosion. Study the photocatalytic, electro-photocatalytic water splitting properties of the Cu2O electrode.

29p xacxuoc4321 08-07-2019 16 6   Download

This paper reports the influence of crystallization temperature and time on transformation of phlogopite to NaP1 and NaA zeolites. Samples were aged at room temperature within 96 hours, crystallized at 90 ÷ 140o C for 48 ÷ 96 hours in the presence of complexon (Co.) and NaOH and continuously stirred. The samples were estimated by X-ray diffraction (XRD), cation exchange capacity (CEC) and water adsorption.

5p uocvong03 24-09-2015 70 6   Download

NaP1 and NaA zeolites were synthesized from phlogopite taken in Yen Bai, Vietnam in the presence of organic complexons and NaOH. Samples were aged at room temperature in 96 hours, crystallized at 90 ÷ 140o C in 48 ÷ 72 hours and continuously stirred. The products were estimated by X-ray diffraction (XRD), scanning electron microscope (SEM), cation exchange capacity (CEC) and water adsorption.

6p uocvong01 24-09-2015 62 5   Download

A new method for the synthesis of nanosized zeolites in organic solvents, such as formamide and toluene as crystallization medium instead of water, in the presence of organosilane has been developed. Organic solvents have a great impact on the synthesis of nanozeolites.

9p tuananhhumg 04-11-2013 54 3   Download

Single-crystal X-ray structure determinations of the complex between the minor-groove binder distamycin and d(GGCCAATTGG) reveal two 1 : 1 binding modes which differ in the orientation of the drug molecule in the minor groove. The two crystals were grown from different crystallization conditions and found to diffract to 2.38 and ˚ 1.85 A, respectively. The structures were refined to completion using SHELXL-93, resulting in a residual R factor of ˚ 20.30% for the 2.38-A resolution structure (including 46 ˚ water molecules) and 19.74% for the 1.

10p system191 01-06-2013 29 5   Download

Antifreeze proteins (AFPs) are produced by several cold-water fish species. They depress physiological freezing temperatures by inhibiting growth of ice crystals and, in so doing, permit the survival of these fish in seawater cooler than their normal freezing temperatures. The type II AFP from rainbow smelt (Osmerus mordax), which is a member of the C-type lectin superfamily, was characterized in terms of its Ca2+-binding quaternary structure and the role of its single N-linked oligosaccharide....

8p research12 01-06-2013 40 4   Download

Nacre organic matrix has been conventionally classified as both
water-soluble and
water-insoluble,basedonits solubility in aqueous solutions after decalcificationwith acid or EDTA. Some characteristics (aspartic acid-rich, silk-fibroin-like content) were specifically attributed to either one or the other. The comparative study on the technique of extraction (extraction with water alone vs. demineralization with EDTA) presented here, seems to reveal that this gen-erally accepted classification may need to be reconsidered....

10p tumor12 22-04-2013 33 2   Download

Citrulline is an efficient hydroxyl radical scavenger that can accumulate at concentrations of up to 30 mmin the leaves of wild watermelon during drought in the presence of strong light; however, the mechanism of this accumulation remains unclear. In this study, we characterized wild water-melon glutamateN-acetyltransferase (CLGAT) that catalyses the trans-acetylation reaction between acetylornithine and glutamate to form acetylglutamate and ornithine, thereby functioning in the first and fifth steps in citrulline biosynthesis....

12p fptmusic 12-04-2013 47 3   Download

The structure of the complex between the minor groove binder netropsin and d(GGCCAATTGG) was determined via single-crystal X-ray tech-niques. The structure was refined to completion usingrefmac5.1.24, result-ing in a residual R-factor of 20.0% (including 68 water molecules). Using crystal engineering and cryocooling techniques, the resolution could be enhanced to 1.75 A ˚ , resulting in an unambiguous determination of the drug conformation and orientation.

11p fptmusic 11-04-2013 34 2   Download

Metformin (1,1-dimethylbiguanide) is an antihyperglycae-mic drug used to normalize glucose concentrations in type 2 diabetes. Furthermore, antioxidant benefits have been reported in diabetic patients treated with metformin. This work was aimed at studying the scavenging capacity of this drug against reactive oxygen species (ROS) like Æ OH and O Æ
2 -free radicals. ROS were produced by gamma radio-lysis of water. The irradiated solutions of metformin were analyzed by UV/visible absorption spectrophotometry.

8p awards 05-04-2013 60 1   Download

To elucidate the molecular mechanism underlying the heat shock response in cold-water fish species, genes enco-ding heat shock transcription factors (HSFs) were cloned fromRTG-2cellsof the rainbowtroutOncorhynchusmykiss. Consequently, two distinctHSF1genes, namedHSF1aand HSF1b, were identified. The predicted amino acid sequence ofHSF1ashows 86.4% identity to that ofHSF1b.Thetwo proteins contained the general structuralmotifs ofHSF1, i.e. a DNA-binding domain, hydrophobic heptad repeats and nuclear localization signals. ...

10p dell39 03-04-2013 41 4   Download

The molecular masses of macromolecules and subunits of the extracellular hemoglobin from the fresh-water crustaceanDaphnia magnawere deter-mined by analytical ultracentrifugation, multiangle laser light scattering and electrospray ionization mass spectrometry.

18p inspiron33 25-03-2013 42 5   Download

The recent convergence of genetic and biochemical evidence on the activit-ies of lipoxygenase (LOX) enzymes has implicated the production of hep-oxilin derivatives (fatty acid epoxyalcohols) in the pathways leading to formation of the water-impermeable barrier of the outer epidermis.

9p galaxyss3 19-03-2013 44 3   Download

The invariant carboxylate residue which follows the Walker B motif (hyd4DE⁄D) in the nucleotide-binding domains (NBDs) of ATP-binding cassette transporters is thought to be involved in the hydrolysis of the c-phosphate of MgATP, either by activating the attacking water molecule or by promoting substrate-assisted catalysis.

13p galaxyss3 07-03-2013 30 5   Download

Proteoliposomes were directly prepared by synthesizing membrane proteins with the use of minimal protein synthesis factors isolated fromEscherichia coli(the PURE system) in the presence of liposomes. Connexin-43 (Cx43), which is a water-insoluble integral membrane protein that forms a hexa-meric complex in membranes, was cotranslationally integrated with an essentially uniform orientation in liposomes.

10p viettel02 19-02-2013 36 4   Download