Highly selective self-condensation of cyclic ketones using MOF-encapsulating phosphotungstic acid for renewable high-density fuel

2015 ◽  
Vol 17 (8) ◽  
pp. 4473-4481 ◽  
Author(s):  
Qiang Deng ◽  
Genkuo Nie ◽  
Lun Pan ◽  
Ji-Jun Zou ◽  
Xiangwen Zhang ◽  
...  
Keyword(s):  
Phosphotungstic Acid ◽  
High Density ◽  
Cyclic Ketones ◽  
Condensed Product

MOF encapsulating catalyst is very selective to transfer biomass-derived cyclic ketones to mono-condensed product through self-condensation and provides great potential for the synthesis of renewable high-density biofuel.

Controllable Coordination of Phosphotungstic Acid-Modified Carbon Matrix for Anchoring Different Sizes of Pt Species: From Single Atoms, Subnanoclusters to Nanoparticles

2021 ◽  
Author(s):  
Jiazhe Li ◽  
Zhiyuan Yan ◽  
Lingxiang Bao ◽  
Cheng-Hui Sun ◽  
Si-Ping Pang
Keyword(s):  
Phosphotungstic Acid ◽  
Carbon Matrix ◽  
High Density ◽  
Coordination Environment ◽  
Single Atoms

Pt species with different sizes uniformly dispersed on phosphotungstic (PTA) acid modified carbon matrix (PTA-C) were controllably synthesized by manipulating the coordination environment. The results indicate that high-density and well-defined...

‘Proton Escalator’ PEI and Phosphotungstic Acid Constructing a Nanofiber Membrane with Remarkable Proton Conductivity

2021 ◽  
Author(s):  
Xiuwei Sun ◽  
Shumei Liu ◽  
Qingyin Wu ◽  
Shan Zhang ◽  
Hong-Rui Tian ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Phosphotungstic Acid ◽  
Proton Conduction ◽  
High Density ◽  
Nanofiber Membrane ◽  
New Type ◽  
High Flexibility

Polyethyleneimine (PEI) is expected to become a new type of proton conduction booster due to its high density amine and extremely high flexibility. Herein, a nanofiber membrane (eHPW-PEI) composed of...

scholarly journals Evaluation of two homogeneous methods for measuring high-density lipoprotein cholesterol

1997 ◽  
Vol 43 (6) ◽  
pp. 1048-1055 ◽  
Author(s):  
Yi-Chang Huang ◽  
Jau-Tsuen Kao ◽  
Keh-Sung Tsai
Keyword(s):  
Polyethylene Glycol ◽  
High Density Lipoprotein ◽  
High Density Lipoprotein Cholesterol ◽  
Phosphotungstic Acid ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
High Density ◽  
Lipoprotein Cholesterol ◽  
Homogeneous Assays ◽  
Better Than

Abstract We evaluated the performance of two homogeneous assays for quantifying HDL cholesterol (HDL-C) and compared them with the phosphotungstic acid (PTA)/MgCl2 assay. Both homogeneous HDL-C assays were precise, having a within-run CV of <1.20% and a between-run CV of <4.07%. The HDL-C values (y) measured by the two homogeneous methods correlated well with those by the PTA/MgCl2 method (x): y = 1.00x + 64.98 mg/L, r = 0.987, Sy|x = 27.99 mg/L (n = 152) for the polyethylene glycol-modified enzymes/α-cyclodextrin sulfate (PEGME) assay (Kyowa), and y = 0.84x + 106.51 mg/L, r = 0.984, Sy|x = 26.10 mg/L (n = 152) for the polyanion–polymer/detergent (PPD) assay (Daiichi). The specificity of the PEGME method seemed better than that of the PPD method, as the PPD method was markedly interfered with by supplemental LDL-C. Addition of 20 g/L triglycerides produced a negative error of ∼18% in both homogeneous assays. Bilirubin and hemoglobin had little influence on the PEGME method; hemoglobin had little effect on the PPD method. Bilirubin, however, markedly decreased the readings by the PPD method. We found the PEGME assay superior to the PPD assay for routine HDL-C testing, because the PPD assay is relatively inaccurate and not specific.

Densitometry of phosphatidylcholine and sphingomyelin in high-density lipoproteins.

1983 ◽  
Vol 29 (7) ◽  
pp. 1435-1437 ◽  
Author(s):  
G Schmitz ◽  
H U Jabs ◽  
G Assmann
Keyword(s):  
Sulfuric Acid ◽  
Phosphotungstic Acid ◽  
High Density ◽  
High Density Lipoproteins ◽  
Low Concentrations ◽  
Layer Chromatography ◽  
Inexpensive Technique ◽  
Native Plasma ◽  
Enzymatic Methods

Abstract We describe the quantitative densitometric determination of phosphatidylcholine (PC) and sphingomyelin (SP) in human serum after precipitation with phosphotungstic acid/MgCl2 and use of thin-layer chromatography. After development, chromatographic plates were charred with methanolic sulfuric acid and MnCl2 and scanned by direct reflectance densitometry in an automated densitometric system interfaced to a basic programmable computing integrator. The method is sensitive enough to detect abnormally low concentrations of PC and SP in high-density lipoproteins. The accuracy of the method was tested either with the Bartlett phosphorus assay or with enzymatic methods for PC and SP; correlations of the described method with the enzymatic determinations were r = 0.93 and 0.88, respectively. Day-to-day precision (CV) for the phospholipid determination was 8.6% for PC and 12.2% for SP. The major advantage of this inexpensive technique is that native plasma or serum or the serum supernate after precipitation can be used without prior delipidation. With this technique serum high-density lipoproteins had PC values of 1.08 (SD 0.32) mmol/L in men (n = 158) and 1.12 (SD 0.37) mmol/L in women (n = 192); similarly, SP values were 0.23 (SD 0.07) mmol/L in the men and 0.23 (SD 0.08) mmol/L in the women. The differences by sex are not significant.

Quantification of high-density-lipoprotein cholesterol by precipitation with phosphotungstic acid/MgCl2.

1983 ◽  
Vol 29 (12) ◽  
pp. 2026-2030 ◽  
Author(s):  
G Assmann ◽  
H Schriewer ◽  
G Schmitz ◽  
E O Hägele
Keyword(s):  
High Density Lipoprotein ◽  
High Performance ◽  
Phosphotungstic Acid ◽  
Density Lipoprotein ◽  
High Density ◽  
Precipitation Method ◽  
Lipoprotein Subfractions ◽  
Precipitation Procedure ◽  
High Density Lipoprotein Subfractions ◽  
Layer Chromatography

Abstract We evaluated the use of a modified phosphotungstic acid/MgCl2 precipitation procedure for the precipitation of apolipoprotein B-containing lipoproteins. Precipitation of these lipoproteins [very-low- and low-density lipoproteins, and lipoprotein (a)] is complete, with negligible coprecipitation of high-density lipoprotein subfractions (HDL1, HDL2, HDL3), even in hypertriglyceridemic sera. In comparison with ultracentrifugation, the precipitation method yields, on the average, values that are 0.17 mmol/L lower for cholesterol values but almost identical for apolipoprotein A-I and phosphatidylcholine. Looking for delta 3,5-cholestadiene formed from cholesterol in the precipitation residue, we used "high-performance" liquid chromatography and "high-performance" thin-layer chromatography and found none.

Renewable high-density spiro-fuels from lignocellulose-derived cyclic ketones

2017 ◽  
Vol 53 (74) ◽  
pp. 10303-10305 ◽  
Author(s):  
Junjian Xie ◽  
Xiangwen Zhang ◽  
Lun Pan ◽  
Genkuo Nie ◽  
Xiu-Tian-Feng E ◽  
...  
Keyword(s):  
Freezing Point ◽  
High Density ◽  
Cyclic Ketones ◽  
Practical Applications ◽  
New Type ◽  
First Time

Renewable high-density spiro-fuels are synthesized from lignocellulose-derived cyclic ketones for the first time, which show high density, low freezing point and represent a new type of renewable high-density fuel attractive for practical applications.

Ultrastructure and Staining of Developing Elastic Tissue

1971 ◽  
Vol 29 ◽  
pp. 244-245
Author(s):  
E. N. Albert
Keyword(s):  
Fine Structure ◽  
Phosphotungstic Acid ◽  
Staining Method ◽  
Rat Aorta ◽  
Uranyl Acetate ◽  
The Other ◽  
Elastic Fibers ◽  
Elastic Tissue ◽  
Lead Citrate ◽  
New Born

Silver tetraphenylporphine sulfonate (Ag-TPPS) was synthesized in this laboratory and used as an electron dense stain for elastic tissue (Fig 1). The procedures for the synthesis of tetraphenylporphine sulfonate and the staining method for mature elastic tissue have been described previously.The fine structure of developing elastic tissue was observed in fetal and new born rat aorta using tetraphenylporphine sulfonate, phosphotungstic acid, uranyl acetate and lead citrate. The newly forming elastica consisted of two morphologically distinct components. These were a central amorphous and a peripheral fibrous. The ratio of the central amorphous and the peripheral fibrillar portion changed in favor of the former with increasing age.It was also observed that the staining properties of the two components were entirely different. The peripheral fibrous component stained with uranyl acetate and/or lead citrate while the central amorphous portion demonstrated no affinity for these stains. On the other hand, the central amorphous portion of developing elastic fibers stained vigorously with silver tetraphenylporphine sulfonate, while the fibrillar part did not (compare figs 2, 3, 4). Based upon the above observations it is proposed that developing elastica consists of two components that are morphologically and chemically different.

Relationship between golgi apparatus and axonal reticulum in sympathetic ganglion cells

1978 ◽  
Vol 36 (2) ◽  
pp. 598-599
Author(s):  
J. Quatacker ◽  
W. De Potter
Keyword(s):  
Golgi Apparatus ◽  
Sympathetic Ganglion ◽  
Phosphotungstic Acid ◽  
Ganglion Cells ◽  
Low Ph ◽  
Dense Core ◽  
Dense Core Vesicles ◽  
Large Dense Core Vesicles ◽  
Cervical Ganglia ◽  
Axoplasmic Reticulum

Mucopolysaccharides have been demonstrated biochemically in catecholamine-containing subcellular particles in different rat, cat and ox tissues. As catecholamine-containing granules seem to arise from the Golgi apparatus and some also from the axoplasmic reticulum we examined wether carbohydrate macromolecules could be detected in the small and large dense core vesicles and in structures related to them. To this purpose superior cervical ganglia and irises from rabbit and cat and coeliac ganglia and their axons from dog were subjected to the chromaffin reaction to show the distribution of catecholamine-containing granules. Some material was also embedded in glycolmethacrylate (GMA) and stained with phosphotungstic acid (PTA) at low pH for the detection of carbohydrate macromolecules.The chromaffin reaction in the perikarya reveals mainly large dense core vesicles, but in the axon hillock, the axons and the terminals, the small dense core vesicles are more prominent. In the axons the small granules are sometimes seen inside a reticular network (fig. 1).

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