Search Results - (Author, Cooperation:D. Stock)

2011-10-25

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Adenosine Triphosphatases/*chemistry/*metabolism ; Adenosine Triphosphate/*metabolism ; Bacterial Proteins/*chemistry/*metabolism ; Binding Sites ; Cardiolipins/analysis/metabolism ; Enterococcus/enzymology ; Hydrolysis ; Hydrophobic and Hydrophilic Interactions ; Mass Spectrometry ; Membrane Lipids/analysis/*metabolism ; Models, Molecular ; Phosphatidylethanolamines/analysis/metabolism ; Protein Conformation ; Protein Multimerization ; Protein Structure, Tertiary ; Protein Subunits/chemistry/metabolism ; Spectrometry, Mass, Electrospray Ionization ; Thermus thermophilus/*enzymology ; Vacuolar Proton-Translocating ATPases/*chemistry/*metabolism

1089-7666

AIP Digital Archive

Physics

An analysis of the Lagrangian motion for small particles denser than surrounding fluid in a two-dimensional steady cellular flow is presented. The Stokes drag, fluid acceleration, and added mass effect are included in the particle equation of motion. Although the fluid motion is regular, the particle motion can be either chaotic or regular depending on the Stokes number and density ratio. The implications of chaotic motion to particle mixing and dispersion are discussed. Chaotic orbits lead to the dispersion of particle clouds which has many of the features of turbulent dispersion. The mixing process of particles is greatly enhanced since the chaotic advection has the property of ergodicity. However, a high dispersion rate was found to be correlated with low fractal dimension and low mixing efficiency. A similar correlation between dispersion and mixing was found for particles convected by a plane shear mixing layer.

Electronic Resource

1365-2303

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2303

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2516

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1095-8649

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Although the phylogenetic relationships of the major groups of fishes have been extensively studied with morphological characters, not all have been convincingly resolved. Analyses of molecular sequences from these groups may provide additional insights into problematical relationships, but are only just beginning to appear. We compare our own results from analyses of 18s ribosomal RNA sequences with those of other studies using globins, parvalbumins, insulin, 28s ribosomal RNA, and portions of two mitochondria1 genes (12S ribosomal RNA and cytochrome b). Our evaluation of these studies reveals some of the difficulties encountered in reconstructing ancient divergences within the fishes, including unequal rates of evolution (among regions of a molecule as well as among lineages), gene duplication, extinction of lineages, and a possible rapid radiation of gnathostome higher taxa. The importance of evaluating the robustness of particular phylogenetic hypotheses is stressed. Some molecules appear to be inappropriate for investigating higher level divergences within the fishes; others are more promising, but must be examined in more taxa to allow an adequate evaluation of their utility. Convincing support for particular hypotheses of relationship will ultimately require congruence of trees generated from independent molecular data sets.

Electronic Resource

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] It is tentatively suggested that this phenomenon may be due to the fact that barium sulphate has a hydrophilic surface (method of Davis and Curt is1), and that it will consequently tend to aggregate so as to present to the benzene the minimum surface per unit volume. In this respect the phenomenon ...

Electronic Resource

0378-4266

Default risk premium ; Risk-free taxable yield ; Risky tax-exempt yield ; [JEL classification codes] E62

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Economics

Electronic Resource

0022-2836

X-ray crystallography ; archaebacteria ; multicatalytic proteinase ; proteasome ; protein degradation

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Biology

Electronic Resource

0168-583X

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Physics

Electronic Resource

1437-1596

Enzyme polymorphism, detection in vaginal secretion ; Secretion status and enzyme determination ; Enzymeigenschaften, Nachweis im Vaginalsekret ; Spurenanalyse, Enzymeigenschaften im Vaginalsekret

Springer Online Journal Archives 1860-2000

Medicine

Law

Zusammenfassung Bei der Untersuchung von blut- und spermafreien Vaginal-abstrichen mit der Stärkegelmethode war in ca. 40% der Fälle der Phosphoglucomutase (PGM1)-Typ der Frau eindeutig festzustellen. Die Ergebnisse stimmten in allen Fällen mit denen im Blut überein. Es konnte kein Zusammenhang zwischen dem Ausscheiderstatus (an Speichel bestimmt) und der Nachweisbarkeit des Enzyms beobachtet werden.

Summary Upon investigation of semen- and blood-free vaginal swabs using starch gel electrophoresis the Phosphoglucomutase type was clearly identified in about 40%. Using cellulose acetate membrane electrophoresis PGM could not be demonstrated. In all cases the results correspond with those obtained in blood. No relation was found between secretor type (determined in saliva) and PGM typing. In vaginal material the following could not be determined: Adenylatkinase (AK) using starch gel electrophoresis, Esterase D (EsD) using cellulose acetate membrane electrophoresis, and Glyoxalase I (GLO) using agarose gel thin-layer electrophoresis.

Electronic Resource

1437-1596

Vaginal secretion, detection of Gm and Inv Factors ; Analysis, Gm and Inv in the vaginal secretion ; Vaginalsekret, Nachweis von Gm- und Inv-Merkmalen ; Spurenanalyse, Gm und Inv im Vaginalsekret

Springer Online Journal Archives 1860-2000

Medicine

Law

Zusammenfassung Im Vaginalsekret sind die Merkmale Gm1 und Gm2 und Inv 1 in Übereinstimmung mit den entsprechenden Serumeigenschaften grundsätzlich zu erwarten. Abweichungen kommen vor. Sie können durch Störfaktoren im Vaginalsekret, aber auch durch andere Faktoren bedingt sein, die im Einzelfall nicht immer feststellbar sind. Wichtig ist es, die für die jeweiligen Antiserenchargen geeigneten Verdünnungen vorher zu testen und die Probenextrakte zu prüfen, ob sie die nötige Eiweißkonzentration aufweisen.

Summary The Gm1, Gm2, and Inv 1-factors in the vaginal secretion are in accordance with the corresponding serum features to be expected basically. Deviations are possible. They are either caused by interference factors in the vaginal secretion or other factors which are not, however, always detectable in each case. It is important to test in advance the appropriate dilutions for the particular antiserum charges and to examine extracts of the samples to find out whether they have the necessary concentration.

Electronic Resource

0148-6195

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Economics

Electronic Resource

0148-6195

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Economics

Electronic Resource

0040-6090

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Physics

Electronic Resource

0168-583X

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Physics

Electronic Resource

1432-041X

Key words Dlx ; Homeobox ; Dentition ; Tooth

Springer Online Journal Archives 1860-2000

Biology

Abstract  The mammalian Dlx homeobox gene family has been shown to play multiple roles in tooth development, but a detailed comparison of the expression pattern of all members throughout tooth development has been lacking. We provide such an analysis for the six known murine Dlx genes. The expression patterns for these genes allow a refinement of previously proposed models for the role of Dlx genes in tooth type specification and raise the possibility of roles for subsets of these genes in tooth initiation, morphogenesis (enamel navel formation, enamel knot induction, cervical loop growth), and enamel formation. The relationship of Dlx gene expression to their genomic organization suggests coordinate regulation of linked genes at early stages but regulatory differences at later stages.

Electronic Resource

1432-1114

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Abstract A laser doppler anemometer (LDA) was used to measure local dispersion coefficients of particles in turbulent flow. The experimental set-up is described along with the data acquisition equipment and processing procedures. Results for 5 μ particles dispersing from a point source in pipe flow are shown. A second estimate for the diffusivity was obtained from mean square dispersion measurements.

Electronic Resource

1432-1335

Renal carcinoma ; metastasis ; pattern

Springer Online Journal Archives 1860-2000

Medicine

Summary The metastatic behaviour of renal cell carcinoma has been studied in a series of 687 necropsies. The observations were consistent with the concept of “metastatic inefficiency”, in that in 295 cases, including 25 with renal vein invasion, there were no detectable metastases. In the present series, renal vein involvement was not an important prognostic factor in stage 1 or 2 disease. In 73% of cases without lung metastases there were none in other sites, and in 84% of those with lung metastases there were others elsewhere, consistent with a metastatic “cascade” in which metastases first developed in the lungs and were later detected in other organs. However, the observations did not permit discrimination between anatomic cascades, in which other organs were seeded from metastasizing pulmonary metastases, and temporal cascades, in which the other were seeded at the same time as the lungs, but with fewer cancer cells. The patterns of arterial metastasis were consistent with the “seed-and-soil” hypothesis, and a novel index was developed to quantify differential organ “soils”. The contralateral kidney was not the best soil for metastases from renal carcinoma. Given the presence of lymph node metastasis, the probability of heamatogenous metastasis is 90%. However, in the absence of nodal metastasis, approximately half the cases had haematogenous metastasis.

Electronic Resource

1434-3916

Springer Online Journal Archives 1860-2000

Medicine

Zusammenfassung Es wird ein Überblick über die seit 1968 an der Orthopädischen Abteilung der Chirurgischen Universitätsklinik Freiburg durchgeführten totalen Hüftendoprothesenoperationen gegeben. Die Operation brachte bei 14,4% der Operierten ein „sehr gutes“ Ergebnis, bei 50,6% ein „gutes“ und bei 29,7% ein „befriedigendes“ Ergebnis. Ein „schlechter“ Operationserfolg fand sich bei 5,6% des Patientengutes. Die Ergebnisse werden im Hinblick auf die möglichen Komplikationen diskutiert.

Summary A review of the hip replacement operations performed by the department of orthopaedics of the University Hospital of Freiburg follows. The operation brought “very good” results for 14.4% of those operated upon, “good” results for 50.6% and satisfactory results for 29.7%. The results of the operation were unsatisfactory for 5.6% of the patients. In view of the possible complications, the results will be discussed.

Electronic Resource