The Tarantula Atypus Milberti in Michigan (Araneae: Atypidae)

Excerpt: The arachnid genus Atypus (family Atypidae, suborder Mygalomorphae) contains four species in North America. These tarantulas are atypical because they have retained remnants of the primitive segmentation characteristic of Mesozoic spiders; the dorsum of the abdomen has tergites which differ little or not at all from those found on Oligocene spiders in the Florissant shales or in Baltic amber. The atypical tarantulas are among the most generalized of all living spiders, lacking the specialized morphological features of more advanced families. They lack reduction, migration, or enlargement of eyes; they have simple dry silk glands only; their legs lack specialization for running or silk handling; the carapace is unspecialized. This genus seems to remain successful in interspecific competition, not because of morphological specialization, but due to behavioral uniqueness. The spider constructs a vertical tube web from an underground burrow up the trunk of a tree. The web acts as a shield, making the spider unrecognizable as a potential predator. The prey is attacked through the silk, pulled inside the tube, and sucked dry. Afterwards the carcass is thrown out and the tube is repaired

Comparison of Flaw Growth Characteristics Under Cryogenic Proof and Ambient Test Conditions for Apollo Titanium Pressure Vessels

Comparison of flaw growth characteristics under cryogenic proof and ambient test conditions for Apollo titanium pressure vessel

Sequence-based typing to identify novel Polymorphisms among Legionella Pneumophila isolates in Western Pennsylvania

Legionella pneumophila is a gram-negative bacterium that can cause two types of human illness, Legionnaires’ disease and Pontiac fever. The goal of this study was to determine the sequence types (STs) for several L. pneumophila isolates collected in western Pennsylvania and compare them to STs from other geographic areas. Investigating ST of L. pneumophila can help to establish control measures and determine sources of outbreaks, both of which are of great public health significance. Environmental and patient samples were collected in Pittsburgh and Erie, Pennsylvania from October 2013 through December 2014. Sequence-based typing (SBT) was conducted to determine the sequence type of L. pneumophila present in the samples. Out of the nine STs that were identified in western Pennsylvania, five were novel. The known STs found in this study were ST 8, 986, 154, and 1941. When compared to similar SBT studies done in Portugal, Canada, England, and Spain, the results of the Pittsburgh study proved to be unique due to the identification of the five novel STs. The known STs found in the study were also not commonly found in investigations in other geographic areas. Overall, the results from the Pittsburgh investigation indicate environmental and patient isolates from western Pennsylvania have a unique ST compared to other isolates of L. pneumophila from around the world

Fracture characteristics of 6 AL-4V titanium alloy forgings containing alpha stringer microstructure Final report, 10 Sep. 1968 - 24 Jan. 1969

Fracture characteristics of 6Al-4V titanium alloy forgings containing alpha stringer microstructur

Foro Nacional de Dramaturgia en México

Foro Nacional de Dramaturgia en Méxic

Deep flaws in weldments of aluminum and titanium

Surface flawed specimens of 2219-T87 and 6Al-4V STA titanium weldments were tested to determine static failure modes, failure strength, and fatigue flaw growth characteristics. Thicknesses selected for this study were purposely set at values where, for most test conditions, abrupt instability of the flaw at fracture would not be expected. Static tests for the aluminum weldments were performed at room, LN2 and LH2 temperatures. Titanium static tests for tests were performed at room and LH2 temperatures. Results of the static tests were used to plot curves relating initial flaw size to leakage- or failure-stresses (i.e. "failure" locus curves). Cyclic tests, for both materials, were then performed at room temperature, using initial flaws only slightly below the previously established failure locus for typical proof stress levels. Cyclic testing was performed on pairs of specimens, one with and one without a simulated proof test cycle. Comparisons were made then to determine the value and effect of proof testing as affected by the various variables of proof and operating stress, flaw shape, material thickness, and alloy

Homenaje nacional al maestro Carballido: Setenta años de Carballido

Homenaje nacional al maestro Carballido: Setenta años de Carballid

The Postmodernization of History in the Theatre of Sabina Berman

The Postmodernization of History in the Theatre of Sabina Berma

Freedom and Fantasy: A Structural Approach to the Fantastic in Carballido's Las cartas de Mozart

Freedom and Fantasy: A Structural Approach to the Fantastic in Carballido's Las cartas de Mozar