DIE SUNDA-GYRINIDEN DES MUSEUM ZOOLOGICUM BOGORIENSE (Col., Gyrinidae)

ABSTRACT NOT AVAILABL

Evolution of the True Contact Area of Laser Textured Tungsten Under Dry Sliding Conditions

Despite the great importance of the real contact area, it is a parameter which, depending on the tribological system, is difficult or impossible to obtain experimentally. In this work, a combination of methods was used to estimate the development of the real contact surface, and the results were compared with the friction coefficient course. The measurements were carried out with a home-built in situ tribometer, which records a 3D image of the surface after each individual friction cycle. A tungsten sample was treated by laser interference with a line-like pattern to produce a deterministic surface. This allowed for more precise tracking of the real contact area when combined with the use of an inert corundum sphere as a counter-body. The real contact area was calculated numerically from the height information obtained using a contact application. Finally, the true contact surface was compared with the parallel-recorded friction values. After a short running-in phase, the friction behavior and the real contact surface showed comparable courses. This indicates that the changes in the real contact area could explain the friction behavior of the laser-patterned sample, and the methodology was proven to be suitable for experimentally estimating the real contact area

Evolution of the True Contact Area of Laser Textured Tungsten Under Dry Sliding Conditions

Despite the great importance of the real contact area, it is a parameter which, depending on the tribological system, is difficult or impossible to obtain experimentally. In this work, a combination of methods was used to estimate the development of the real contact surface, and the results were compared with the friction coefficient course. The measurements were carried out with a home-built in situ tribometer, which records a 3D image of the surface after each individual friction cycle. A tungsten sample was treated by laser interference with a line-like pattern to produce a deterministic surface. This allowed for more precise tracking of the real contact area when combined with the use of an inert corundum sphere as a counter-body. The real contact area was calculated numerically from the height information obtained using a contact application. Finally, the true contact surface was compared with the parallel-recorded friction values. After a short running-in phase, the friction behavior and the real contact surface showed comparable courses. This indicates that the changes in the real contact area could explain the friction behavior of the laser-patterned sample, and the methodology was proven to be suitable for experimentally estimating the real contact area

Six sequence variants on chromosome 9p21.3 are associated with a positive family history of myocardial infarction: a multicenter registry

<p>Abstract</p> <p>Background</p> <p>Recent genome-wide association studies have identified several genetic loci linked to coronary artery disease (CAD) and myocardial infarction (MI). The 9p21.3 locus was verified by numerous replication studies to be the first common locus for CAD and MI. In the present study, we investigated whether six single nucleotide polymorphisms (SNP) rs1333049, rs1333040, rs10757274, rs2383206, rs10757278, and rs2383207 representing the 9p21.3 locus were associated with the incidence of an acute MI in patients with the main focus on the familial aggregation of the disease.</p> <p>Methods</p> <p>The overall cohort consisted of 976 unrelated male patients presenting with an acute coronary syndrome (ACS) with ST-elevated (STEMI) as well as non-ST-elevated myocardial infarction (NSTEMI). Genotyping data of the investigated SNPs were generated and statistically analyzed in comparison to previously published findings of matchable control cohorts.</p> <p>Results</p> <p>Statistical evaluation confirmed a highly significant association of all analyzed SNP's with the occurrence of MI (p < 0.0001; OR: 1.621-2.039). When only MI patients with a positive family disposition were comprised in the analysis a much stronger association of the accordant risk alleles with incident disease was found with odds ratios up to 2.769.</p> <p>Conclusions</p> <p>The findings in the present study confirmed a strong association of the 9p21.3 locus with MI particularly in patients with a positive family history thereby, emphasizing the pathogenic relevance of this locus as a common genetic cardiovascular risk factor.</p

West Indian Gyrinidae and a new Gyretes

8 p. ; 24 cm.Includes bibliographical references

Über die Gyriniden (Col.) von Guiana

Von 14 Taumelkäfer-Arten, die bislang für Guiana nachgewiesen waren, kannte man aus Suriname lediglich 2. Dank der Sammeltätigkeit der Naturwissenschaftlichen Suriname Expedition 1949 in den Nassau Gebergte erhöhen sich diese Zahlen um 3 neue Arten und 2 Unterarten, die hierunter beschrieben werden, auf 19 bezw. 7. Auch diese Ziffern erscheinen noch sehr niedrig angesichts der günstigen Lebensbedingungen, die den Taumelkäfern in diesem tropischen, von zahlreichen Bächen und Flüssen verschiedener Grösse und Charakters bewässerten Bergland geboten sind. Zweifellos wird in Zukunft eine gründliche Erforschung der verschiedenen Fluss-Systeme in verschiedenen Höhenlagen die Gyriniden-Fauna von Guiana um zahlreiche Arten bereichern. Meine vorliegende Arbeit behandelt nicht nur die in den 3 Guiana’s (Suriname, Französisch- und Britisch-Guiana) vorkommenden Gyriniden, es war vielmehr notwendig, auch den südöstlich anschliessenden Teil Brasiliens einzubeziehen, der seiner Natur nach dazu gehört, sowie 2 Arten, die am Mt. Roraima auf venezolanischem Gebiet entdeckt wurden, da für sie die Überschreitung der nahen Grenze von Britisch Guiana sicher kein Hindernis darstellt

cber die von Dr. J. Bechyn\ue9 in Franzosisch-Guinea gesammelten Gyriniden (Col.)

Volume: 5Start Page: 74End Page: 8