Niko Farber

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Dexmedetomidine, an alpha2-adrenergic agonist, produces sedation and reduces volatile anesthetic requirements. This investigation compared the actions of dexmedetomidine and halothane on the processed EEG and on the electromyogram (EMG) which has not been previously described. Chronically instrumented cats were prepared with arterial and venous cannulae,(More)
UNLABELLED The sedative and anesthetic-sparing ability of the alpha2-adrenergic agonist dexmedetomidine is well documented. In this study, we identified the effects of halothane, with and without dexmedetomidine, on hemodynamic and electroencephalographic (EEG) variables and quantified the concentration of halothane resulting in various anesthetic depth(More)
The specific stimulation of various somatic sensory afferent nerves results in significant changes in autonomic responses, including systemic arterial pressure (AP) and heart rate (HR). These reflexively mediated responses have been termed the "somatosympathetic reflex" (SSR). The SSR is mediated at spinal and supraspinal sites within the central nervous(More)
The heterogeneous structure of the Internet is a great obstacle for establishing real-time video services. Scalable video codecs, generating bit-streams decodable at diierent rates, have been proposed to address the heterogeneity problem. In this paper, we will review standard-compliant and non-compliant codec architectures for Internet video-on-demand. For(More)
The effects of acute treatment with delta 9-tetrahydrocannabinol (delta 9-THC) on serum levels of thyrotropin (TSH) and the thyroid hormones triiodothyronine (T3) and thyroxine (T4) were determined in the rat. Intraperitoneal doses of delta 9-THC greater than 3 mg/kg reduced serum TSH levels to less than 10% of control. The ED50 for delta 9-THC was(More)
This investigation examined the direct effects of hyper- and hypocarbia on intracerebral resistance vessels within an intact neuronal synctium. Hippocampal rat brain slices were superfused with artificial cerebrospinal fluid (aCSF). Arterioles were located and diameter changes in response to alterations in aCSF carbon dioxide tension (pCO2) were monitored(More)
BACKGROUND This study examined the effects of halothane on arterial pressure after central nervous system (CNS) pressor site stimulation in anesthetized cats, cats rendered unconscious by midcollicular transection, and conscious cats. METHODS Two anesthetized groups and two nonanesthetized groups were used. Cats were anesthetized with either(More)
BACKGROUND Normal thermoregulatory function is believed to be modulated by thermosensitive neurons in the preoptic region of the anterior hypothalamus and other sites within the central nervous system including the spinal cord. Previous evidence has demonstrated modulation of segmental spinal cord thermoregulatory mechanisms from more rostral central(More)
BACKGROUND In vivo, halothane alters spontaneous firing in and thermosensitivity of neurons in the preoptic region of the anterior hypothalamus. To better understand the mechanisms by which halothane specifically disrupts normal thermoregulation, this investigation examined the effects of halothane on thermosensitive preoptic region neurons in isolated(More)
This paper gives an overview over recent advances in video compression and transmission. The new H.263 video compression standard is an important milestone towards widespread use of personal video communication. For mobile video applications and video transmission over networks , error robustness and scalability are important issues. Structure-from-motion(More)