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Robert Tibbs, Alexander Zubkov, Kazuya Aoki, Toshinari Meguro, Ahmed Badr, Andrew Parent and John Zhang

60 Å, and examined using TEM. Measurements of Arterial Diameter The arterial diameter was measured in a double-blinded fashion from enlarged angiograms. To eliminate differences in these angiographic measurements, a penny was placed on the dog's chin during the angiography procedure. The coin was used as a standard, and all values of the arterial diameter were relatively adjusted to the size of the coin. Two researchers independently measured the arterial diameter on the magnified angiograms at the distal, central, and proximal portions of the BA. The mean of these

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Ramesh Kumar, Frederic W. B. Deleyiannis, Corbett Wilkinson and Brent R. O'Neill

C anines have played an important role in the history of modern humans, providing companionship, security, and labor. However, this relationship can at times be strained, as evident by the considerable public health problem of domestic dog attacks, especially among the pediatric population. In 2001 alone, 368,245 patients were treated in US emergency departments for dog bites, the majority of whom were 5–9 years old. 3 Dog attacks on children may cause significant morbidity 2 , 6 and occasionally may even be fatal. 2 , 21 , 26 Attacks on young children

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Fernando G. Diaz, Angeline R. Mastri, James I. Ausman and Shelley N. Chou

acute cerebral revascularization performed 4 and 24 hours after regional cerebral ischemia in the dog. Materials and Methods Twenty-eight old mongrel dogs whose age was determined by the characteristics of their dentition, gingival mucosa, and fur, and of weights varying from 14 to 18 kg were obtained. All animals were subjected to an initial neurological examination. 12 Only those animals with completely normal neurological grading and without signs of systemic disease were accepted into the study. Anesthesia was induced with one intravenous dose of sodium

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Archie R. Tunturi

of displacement, velocity, and acceleration. Elastic bodies like the spinal cord and dura will undergo deformation under these conditions, and various kinds of waves may be transmitted for considerable distances. In order to understand the mechanics of the dura and spinal cord relative to injury, the following experiments were performed to define static elastic properties 4 of the spinal cord dura in the dog. The study of the elasticity of the dura was also made for experiments to determine its effect on regeneration and recovery after spinal cord injury

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Shigeaki Hori and Williamina A. Himwich

inaccessibility. Besides being of physiological interest, the anterior part of the circle of Willis is important from a clinical point of view, since most intracranial aneurysms occur in this vicinity. 16, 17 To obtain data on flow and pressure in these arteries, we have exposed the anterior part of the circle of Willis in the dog through an anterior transsphenoidal approach. In this paper the technique of the exposure and some of the physiological and anatomical characteristics of the vessels in the anterior part of the circle of Willis will be described. Materials and

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Glyn R. Wellum, Thomas W. Irvine Jr. and Nicholas T. Zervas

this paper, the dose response of cerebral arteries in vitro from three species, dog, rabbit, and man, to purified human hemoglobin. Materials and Methods Basilar Arteries Mongrel adult dogs of either sex were anesthetized with sodium pentobarbital and sacrificed by exsanguination. The basilar arteries were quickly removed and placed in sterile buffer solution. The arteries were sectioned into 4-mm lengths before placement on the force transducer. New Zealand white rabbits of either sex, weighing 2 to 3 kg, were sacrificed with sodium pentobarbital, and

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Robert H. Wilkins and Philip Levitt

Evans blue. Usually there was a transient bradycardia and hypotension of moderate degree near the end of the injection, with a gradual return of the pulse rate and blood pressure to normal over seconds to minutes. 21 Typically, if the dog had not been paralyzed with succinylcholine chloride, it had a tonic seizure that began during the injection and lasted from 10 to 60 sec. During this period the electroencephalogram (EEG) was marred by muscle contraction artifact. The EEG tracings of the dogs that received 10 to 50 mEq/L of potassium were otherwise unchanged, but

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Archie R. Tunturi

E xperimental trauma of the spinal cord has been investigated in animals by means of dropped weights, 10, 11 compression, 13 and transection. 4 In none of the studies have the static or dynamic mechanical properties of the dura and cord been examined. In human cadavers 6 to 48 hours after death, Breig 1 studied the displacements of the dura and cord in situ for various positions of flexion and extension of the vertebral column. In a recent paper by Tunturi, 12 the static elastic property of the spinal cord dura was reported for the dog. It was found

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Kamal Mousa Mira, Ibrahiem Abou Elnaga and Hassanein El-Sherif

: Photomicrograph of transverse section of the sensory root of the trigeminal nerve near the pons showing nerve cells. Modified nitroacetone silver stain, × 400. Center: Photomicrograph of transverse section of the sensory root of the trigeminal nerve near the pons showing nerve cell. H & E, × 400. Right: Photomicrograph of longitudinal section of the motor root of the trigeminal nerve showing nerve cell. Modified nitroacetone silver stain, × 400. In the dog material, similar nerve cells with no specific location were also observed ( Fig. 4 ). Fig. 4. Dog

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Michael Nosko, Christel A. Krueger, Bryce K. A. Weir and David A. Cook

preparations of cerebral vessels from the cynomolgus monkey, dog, and man. Materials and Methods Healthy adult female cynomolgus monkeys (Macaca fasicularis) , * each weighing 3 to 4 kg, were anesthetized with intramuscular ketamine hydrochloride (6 to 10 mg/kg) and sacrificed by exsanguination. The middle cerebral and basilar arteries were immediately resected and placed in oxygenated Krebs bicarbonate solution of the following composition: Na + , 132 mM; K + , 5.9 mM; Ca ++ , 2.5 mM; Mg ++ , 1.2 mM; Cl − , 122.7 mM; HCO 3 − , 25 mM; SO 4 −− , 1.2 mM; H 2 PO 4 − , 1