Ottoia prolifica Walcott, 1911 is a 500 million years old fossil cycloneuralian worm from the Burgess Shale, Canada, British Columbia. We report newly observed details of the morphology and ontogeny of this species. Previously unknown details could be observed by applying crossedpolarized light. This approach revealed that the tail end is equipped with six hook-shaped spines and that the scalid...

A 16-year-old male patient was admitted to our hospital with traumatic luxation of right testis due to self-mutilation with a retractable knife on Apr. 20, 2004. He had been followed as temporal lobe epilepsy and suspicions of gender identify disorder by a pediatrician. He was fully oriented with a clear sensory and normal perception, but had no memory of what he had done. His parents were free...

Structural-functional roles of microtubules in cells and cell appendages are becoming well established . A "static" supportive function could be assigned to the microtubular arrays in the axonemes of Heliozoa (Actinophrys, 7 ; Echinosphaerium, 18) and Radiolaria (Nassellaria, 5), in the tentacles of Suctoria (Acineta, 3 ; Tokophrya, 12), and in the endosprits of the ciliate Cyathodinium (9) . M...

We report the discovery of sipunculan worms from the Lower Cambrian Maotianshan Shale, near Kunming (southwest China). Their sipunculan identity is evidenced by the general morphology of the animals (sausage-shaped body with a slender retractable introvert and a wider trunk) and by other features, both external (e.g. perioral crown of tentacles, and hooks, papillae and wrinkle rings on the body...

A series of experiments was performed to determine whether sign-tracking would occur in rats with intravenous (i.v.) cocaine as the unconditioned stimulus. In Experiment 1, a retractable lever paired with food produced strong sign-tracking, but a lever paired with one of three doses of i.v. cocaine did not elicit any approach or contact behavior. Experiment 2 demonstrated that doses of cocaine ...

Abstract In recent years, as a new type of gob-side entry retaining method, roadway automatically formed by roof cutting and pressure releasing (RAFRCPR) has been widely used in China. Under the condition deep mining, deformation gangue rib is difficult to control, it for traditional I-shaped steel provide needed support. To effectively control rib, U-shaped retractable prevention structure (UR...

The genus Pallisentis has been mostly found among the freshwater fishes of Channidae family. ophiocephali is characterized with some unique characters proboscis, hooks, and spines. However, initial description a little sketchy yet not updated. present study communicates detail morphology an acanthocephalan species obtained from two host family—Channa striatus Channa punctatus—during one-year su...

Public bulletin boards are widely used in various public places, but due to the large size of billboards, it is not easy carry, and traditional billboards integrated, when need be transferred, limited storage space vehicle needs occupied It extremely inconvenient, at night, install additional light sources illuminate them, which greatly increases energy consumption. Based on this paper designed...