The acetoin and diacetyl contents of culture supernatants of Voges-Proskauer-positive "viridans" streptotocci, Klebsiella pneumoniae and Staphylococcus aureus, were determined by a gas liquid chromatographic procedure, in which supernatants were extracted with diethyl ether and diacetyl was measured on columns of 10% (wt/wt) polyethylene glycol 400 (PEG 400) at 73 C. Acetoin was converted to di...

The differential solubility of macromolecules governs their crystallization and is thus of great importance to crystallography (Blundell and Johnson, 1976; McPherson, 1982, 1985a,b, 1990; Feher and Kam, 1985; Giegé and Mokol, 1989; Ollis and White, 1990; Giegé and Ducruix, 1992; Giegé et al., 1994). In addition, precipitation is widely applied as a fractionation method for the purification of m...

Premixed calcium phosphate cements can reduce handling complications that are associated with the mixing of cements in the operating room. However, to extend the clinical indication of ceramic cements their mechanical properties need to be further improved. The incorporation of a polymeric material with intrinsically high tensile properties could possibly assist in increasing the mechanical pro...

BACKGROUND Ultrasmall superparamagnetic iron oxide (USPIO) nanoparticles are used as blood pool contrast agent for magnetic resonance angiography and perfusion imaging. Our aim in this study was to investigate the effect of the two coating types of iron oxide nanoparticles on the relationship between nanoparticles concentration and signal intensity (SI) in T1-weighted MR images. METHODS Diffe...

Health regulatory approval of the 1.5 microg/kg body weight dose of pegylated interferon (PEG-I) alpha-2b in combination with ribavirin for the treatment of chronic hepatitis C was based on a study using PEG-I alpha-2b at doses of only 0.5 and 1.5 microg/kg body weight (BW), in spite of the previously shown flat dose-response curve at doses of > or =1.0 microg/kg. Our aim was to compare PEG-I a...

The present work concerns on the investigation of the role of polyethylene glycols (PEGs) as masking agent for amelioration of extraction-separation of La(III), Eu(III) and Er(III) ions by the acidic extractant bis(2-ethylhexyl)phosphoric acid (DEHPA). The studied solvent extraction system is based on the combination of chelating effect of DEHPA in the organic phase on the one hand, and the bin...

We have previously shown that dietary polyethylene-glycol (PEG) suppresses the occurrence of azoxymethane-induced cancers in an accelerated rat model of colon carcinogenesis. To determine the consistency of this preventive effect, we carried out a long-term study in rats fed the standard American Institute of Nutrition 1976 diet, and 7 short-term prevention studies in rodents. A total of 337 F3...

background: ultrasmallsuperparamagnetic iron oxide (uspio) nanoparticles are used as blood pool contrast agent for magnetic resonance angiography and perfusion imaging. our aim in this study was to investigate the effect of the two coating types of iron oxide nanoparticles on the relationship between nanoparticles concentration and signal intensity (si) in t1-weighted mr images.   methods : dif...

Penetian ini bertujuan untuk mengetahui pengaruh kristalinitas terhadap stabilitas termal komposit termoplastis dengan pengisis silika xerogel. Polimer yang digunakan adalah polietilena glikol (PEG 4000) merupakan polimer termoplastis. Silika xerogel diekstraksi melalui proses alkali fusion . didapatkan menunjukkan fasa amorf X-Ray Diffraction (XRD). ditambahakan ke dalam PEG 4000 komposisi ber...

Abstract Die Reduzierung der Belastungen von Gewässern mit Mikroschadstoffen ist eine wichtige Zielsetzung Wasserwirtschaft und Bestandteil Umweltpolitik. Keramische Nanofiltrationsmembranen wurden als Mehrkanalrohre erhöhter spezifischer Membranfläche Rotationsscheibenfilter entwickelt. entwickelten Membranen zeigen Rückhalte über 80 % für PEG 400. werden aktuell zur Abtrennung aus Pharmazeuti...