31 research outputs found
Heterogeneity of Endothelial Cell Function for Angiotensin Conversion in Serial-Arranged Arterioles
The involvement of the endothelial cell in the vasoconstriction induced by angiotensin I and II (AI, AII), and norepinephrine (NE) was studied in microvessels of the hamster cheek pouch before and after the following procedures: endothelial impairment by light-dye treatment, inhibition of angiotensin-converting enzyme (ACE), blockade of endothelium-derived relaxing factor (EDRF) and inhibiting prostaglandin (PG) synthesis. The results showed that in large 2nd-order arterioles, endothelial impairment did not affect the vasoconstrictor activity of AII and NE, nor did it alter ACE activity. However, in small 4th-order arterioles, endothelial impairment significantly reduced angiotensin conversion without altering the vasoconstrictor responses to either AII or NE. Thus, the endothelium plays differential roles in the modulation of local angiotensin conversion in these distinct segments of serial-arranged arterioles. Furthermore, it is unlikely that the vasoconstrictor response to AII in these arterioles is modulated by the endothelium through a pathway involving the release of EDRF or PGs
Rate Adaptive Dual Chamber Pacing: Inappropriate Rate Response due to Pseudomalfunction of the QT Biosensor
Agricultural intensification in a Philippine frontier community: Impact on labor efficiency and farm diversity
Generation and Characterization of Human Hematopoietic Cell Lines Expressing Factor VIII
Clinical applications of 1H-MR spectroscopy in the evaluation of epilepsies - What do pathological spectra stand for with regard to current results and what answers do they give to common clinical questions concerning the treatment of epilepsies?
Expression of Normal and Mutagenized Apolipoprotein CII in Procaryotic Cells. Structure-Function Relationship
The shifting ground of swidden agriculture on Palawan Island, the Philippines
Recent literature describing the process and pathways of the agrarian transition in Southeast Asia suggests that the rise of agricultural intensification and the growth of commodity markets will lead to the demise of swidden agriculture. This paper offers a longitudinal overview of the conditions that drive the agrarian transition amongst indigenous swidden cultivators and migrant paddy farmers in central Palawan Island, the Philippines. In line with regional agrarian change, we describe how a history of conservation policies has criminalized and pressured swidden farmers to adopt more intensive "modern" agricultural practices. We examine how indigenous swidden cultivators adjust their practice in response to recent changes in policies, security of harvests, and socio-cultural values vis-à-vis intensification. Rather than suggest that this transition will lead to the demise of swidden, results reveal that farmers instead negotiate a shifting ground in which they lean on and value swidden as a means of negotiating agrarian change. © 2009 Springer Science+Business Media B.V