Breathing 100% O 2 , but not 40% O 2 , during exercise reduces blood flow through intrapulmonary arteriovenous anastomoses (1175.7)

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Exercise is a stress to the pulmonary vasculature. With incremental exercise, the pulmonary diffusing capacity (DLCO) must increase to meet the increased oxygen demand; otherwise, a diffusion limitation may occur. The increase in DLCO with exercise is due to increased capillary blood volume (Vc) and membrane diffusing capacity (Dm). Vc and Dm increase secondary to the recruitment and distension...

Poly[tetra­aqua­bis­(μ3-oxalato-κ5 O 1,O 2:O 1′:O 1′,O 2′)(μ2-oxalato-κ4 O 1,O 2:O 1′,O 2′)dipraseodymium(III)]

In the title complex, [Pr(2)(C(2)O(4))(3)(H(2)O)(4)](n), the two independent Pr(III) ions are both nine-coordinated in a distorted monocapped square-anti-prismatic geometry by seven O atoms from four oxalate ligands and two water mol-ecules. The Pr(III) ions are bridged by the oxalate ligands, forming a layer parallel to (001). O-H⋯O hydrogen bonds connect the layers.

Poly[di-μ-aqua-di­aqua­bis­(μ7-oxalato-κ9 O 1:O 1:O 1,O 2:O 2:O 2′:O 2′,O 1′:O 1′)calciumdicaesium]

In the title compound, [CaCs2(C2O4)2(H2O)4] n , the Ca(2+) ion, lying on a twofold rotation axis, is coordinated by four O atoms from two oxalate ligands and two bridging water mol-ecules in an octa-hedral geometry. The Cs(+) ion is coordinated by seven O atoms from six oxalate ligands, one bridging water and one terminal water mol-ecule. The oxalate ligand displays a scarce high denticity. The...

Bradykinin, digital blood flow, and the arteriovenous anastomoses.

• During studies on the anticoagulating properties of snake venom, Rocha e Silva and associates discovered the vasoactive polypeptide, bradykinin. The substance was called bradykinin because, in contrast to histamine and acetylcholine, it stimulated smooth muscle to contract after a latent period and because the contraction was gradual. The substance received little attention until recently whe...

O + + H 2 O „ + M ... \ H 5 O 2 + „ + M ...