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31.
H. Wetzel 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1967,133(6):353-357
Zusammenfassung Es wurde der Magnesiumgehalt von Hausgeflügel- und Vogeleischalen mit Titangelb photometrisch bei 530 oder 535 nm bestimmt,
wobei folgende Werte gefunden wurden: Hühnereischalen (ohne Schalenhaut) 0,23–0,52%, (mit Schalenhaut) 0,20–0,46%; Puteneischalen
(ohne Schalenhaut) 0,2–0,47%, (mit Schalenhaut) 0,22–0,46%; Enteneischalen (ohne Schalenhaut) 0–0,02%, (mit Schalenhaut) 0–0,021%;
G?nseeischalen (ohne Schalenhaut) 0,05–0,17%; Schalen von Eiern der Sturmm?we (Larus canas) (ohne Schalenhaut) 0,05–0,08%; Taubeneischalen (mit Schalenhaut) 0,17–0,22% Mg. Der signifikante Unterschied im Magnesiumgehalt
der Enteneischalen gegenüber dem der Schalen von Hühner- oder Puteneiern gestattet einen sicheren Nachweis von Enteneiern,
sofern mindestens noch Schalenbruchstücke zur Verfügung stehen. Für diesen Zweck wird auch eine verkürzte Nachweismethode
beschrieben.
Fr?uleinElke Grahlow danke ich für die gewissenhafte Durchführung der Analysen und der Chroma-Gesellschaft Schmid & Co. (Stuttgart-Untertürkheim)
und der E. Merek AG (Darmstadt) für die freundliche überlassung von Titangelb. 相似文献
32.
O Wetzel M Hormi L Le Normand G Karam J Guenel J Auvigne JM Buzelin 《Canadian Metallurgical Quarterly》1993,3(2):252-262
The authors report a retrospective series of 217 cases of autosomal dominant renal polycystic disease collected over a period of 30 years in the urology and nephrology departments of Nantes university hospital. They study the incidence of urological complications, observed in 87 patients (40%), consisting of calculi (15%), infection (22%, with 4 deaths), intracystic haemorrhages (3.5%) and urinary tract compression (2%). The diagnostic and therapeutic methods are presented and discussed. The results of renal transplantation are also analysed: 39 patients were transplanted, 72% retained a functioning kidney with a mean follow-up of 44.9 months (range: 12-108 months) and three patients died as a result of infectious complications. The 1-year and 3-year actuarial transplant survival rate of 92% was similar to that of renal transplantations performed for another form of renal disease. Preparation for renal transplantation remains an essential problem: the two major indications for pre-transplantation nephrectomy were the size of the kidneys and the presence of infection. 相似文献
33.
34.
T. N. Tweeten D. L. Wetzel O. K. Chung 《Journal of the American Oil Chemists' Society》1981,58(6):664-672
A high performance liquid chromatographic (HPLC) method was developed for analyzing digalactosyldiglycerides (DGDG) and monogalactosyldiglyceride
(MGDG) in polar lipids fractionated from lipid extracts of wheat or flour. Wheat lipid samples were prepared by solvent extraction,
then fractionated on a silica gel packed open column. A Spherisorb ODS (octadecyl silane) column with methanol/water elution
system was used for separation of glycolipids in the polar lipid fractions. The detection limit of the refractive index detector
with interferometric optics was 0.25μg for both DGDG and MGDG. Separating on nonpolar bonded phase columns permitted us to differentiate, based on fatty acid composition
and position, among components within the specific glycolipid classes. Semipreparative HPLC on analytical columns was used
to subfractionate the polar lipids. The glycolipids were collected for functional group characterization. Approximately 35%
of each DGDG subfraction was accounted for as carbohydrate. The absence of phosphorus precluded phospholipids. Fatty acid
analysis by gas chromatography showed the first DGDG to be linoleic acid, whereas the second DGDG peak was composed of linoleic,
oleic and palmitic acids. Mass spectrometric analysis of the first DGDG peak showed linoleic acid in both the SN-1 and 2 positions.
Mass spectrometric analysis revealed that palmitic or oleic acid in the second peak was preferentially located on the SN-1
position; linoleic acid was on the SN-2 position.
Contribution no. 80-207J, Department of Grain Science and Industry, Kansas Agricultural Experiment Station, Kansas State University,
Manhattan, KS. Part of a dissertation submitted by T.N. Tweeten in partial fulfillment of the PhD degree. Honored Student
Award Presentation at AOCS annual meeting, San Francisco, April 1979. 相似文献
35.
Lemarchand E Dormieux L Ulm FJ 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2005,363(1836):2581-2602
Expansive reactions damage porous materials through the formation of reaction products of a volume in excess of the available space left by the reactants and the natural porosity of the material. This leads to pressurizing the pore space accessible to the reaction products, which differs when the chemical reaction is through-solution or topochemical or both in nature. This paper investigates expansive reactions from a micromechanical point of view, which allows bridging the scale from the local chemo-mechanical mechanisms to the macroscopically observable stress-free expansion. In particular, the study of the effect of morphology of the pore space, in which the chemical expansion occurs locally, on the macroscopically observable expansion is the main focus of this paper. The first part revisits the through-solution and the topochemical reaction mechanism within the framework of micro-macro-homogenization theories, and the effect of the microscopic geometry of pores and microcracks in the solid matrix on the macroscopic chemical expansion is examined. The second part deals with the transition from a topochemical to a through-solution-like mechanism that occurs in a solid matrix with inclusions (cracks, pores) of different morphology. 相似文献
36.
37.
38.
R. Dennis Cook Nate Wetzel José D. Bermúdez J. De La Horra Frank Critchley Michael Lavine Ker-Chau Li R. E. McCulloch Sally C. Morton X. Shen Sanford Weisberg S. Zacks 《TEST》1993,2(1-2):33-100
Summary We investigate the extent to which it may be possible to carry out a regression analysis using graphics alone, an idea that
we refer to asgraphical regression. The limitations of this idea are explored. It is shown that graphical regression is theoretically possible with essentially
no constraints on the conditional distribution of the response given the predictors, but with some conditions on marginal
distribution of the predictors. Dimension reduction subspaces and added variable plots play a central role in the development.
The possibility of useful methodology is explored through two examples.
Read before the Spanish Statistical Society at a meeting organized by the Carlos III University of Madrid on Wednesday, April
21, 1993 相似文献
39.
J. Senawiratne Y. Li M. Zhu Y. Xia W. Zhao T. Detchprohm A. Chatterjee J.L. Plawsky C. Wetzel 《Journal of Electronic Materials》2008,37(5):607-610
We present a junction temperature analysis of GaInN/GaN quantum well (QW) light-emitting diodes (LEDs) grown on sapphire and
bulk GaN substrate by micro-Raman spectroscopy. The temperature was measured up to a drive current of 250 mA (357 A/cm2). We find better cooling efficiency in dies grown on GaN substrates with a thermal resistance of 75 K/W. For dies on sapphire
substrates we find values as high as 425 K/W. Poor thermal performance in the latter is attributed to the low thermal conductivity
of the sapphire. Three-dimensional finite-element simulations show good agreement with the experimental results, validating
our thermal model for the design of better cooled structures. 相似文献
40.