The clinical role of collateral vessels was evaluated during transient coronary occlusion by percutaneous transluminal coronary angioplasty in 22 patients with (8) and without (14) collateral vessels. Coronary occlusion pressure, the ratio of mean coronary occlusion pressure to mean aortic pressure and myocardial perfusion pressure at 40 s of balloon inflation were significantly higher in patie...

Cetaceans are neckless, so the trachea is very short. The upper respiratory tract is separate from the mouth and pharynx, and the dorsal blowhole connects, via the vestibular and nasopalatine cavities, directly to the larynx. Toothed cetaceans (Odontoceti) are capable of producing sounds at depth, either for locating prey or for communication. It has been suggested that during dives, air from t...

Introduction: Inflammatory joint diseases are common in elderly, and regulation of joint blood flow (JBF) is important in these conditions. The aim of this study was to investigate the response of inflamed joint blood vessels to angiotensin (Ang ), a vasoconstrictor factor which has been shown to be produced in inflamed joints locally. Identification of Ang receptor subtypes in joint blood ve...

The high-altitude (HA) native yak (Bos grunniens) has successfully adapted to chronic hypoxia (CH) despite being in the same genus as domestic cows, which are known for their great hypoxic pulmonary vasoconstrictor responses (HPVRs), muscular pulmonary arteries, and development of severe pulmonary hypertension on exposure to CH. To determine possible mechanisms by which the pulmonary circulatio...

Pericytic / perivascular neoplasms have traditionally been dominated by haemangiopericytoma. However, it is now recognized that the latter diagnostic category subsumes a wide variety of tumour types which share the presence of thin-walled branching blood vessels. If such lesions are otherwise classified, there remains only a small group of spindle cell lesions designated as haemangiopericytoma,...

The synthesis of vertically aligned single-walled carbon nanotubes (VA-SWNTs) by plasma-enhanced chemical vapor deposition (PECVD) was achieved at 500-600 °C, using ethylene as the carbon source and 1 nm Fe film as the catalyst. For growth of high-quality VA-SWNTs in a plasma sheath, it is crucial to alleviate the undesirable ion bombardment etching effects by the optimization of plasma input p...

We demonstrate a novel cross-sectional deformation, called the radial corrugation, of multi-walled carbon nanotubes (MWNTs) under hydrostatic pressure. Theoretical analyses based on the continuum elastic approximation have revealed that MWNTs consisting of more than ten concentric walls undergo elastic deformations at critical pressure pc ≃ 1 GPa, above which the circular shape of the cross sec...

Histopathology Histological study of a 4-mm punch biopsy obtained from the center of the lesion showed a proliferation of dilated, thin-walled vessels in the superficial and deep dermis, in intimate contact with an increased density of eccrine glands of normal size and morphology, a few hair follicles, and adipose tissue. There were no visible changes in the epidermis and no mitotic figures or ...