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The regulation by light of the composition of the photosynthetic apparatus was investigated in photomorphogenic mutants of Arabidopsis thaliana (L.) Heynh. cv. Landsberg erecta. Leaf chlorophyll, photosynthesis, photosystem II function, and ribulose-1,5-bisphosphate carboxylase-oxygenase and photosystem II contents were determined for plants grown under(More)
Abstinence from sexual intercourse is an important behavioral strategy for preventing human immunodeficiency virus (HIV), other sexually transmitted infections (STIs), and pregnancy among adolescents. Many adolescents, including most younger adolescents, have not initiated sexual intercourse and many sexually experienced adolescents and young adults are(More)
In common with many other higher plant species, Arabidopsis undergoes photosynthetic acclimation, altering the composition of the photosynthetic apparatus in response to fluctuations in its growth environment. The changes in photosynthetic function that result from acclimation can be detected in a noninvasive manner by monitoring chlorophyll (Chl)(More)
Endothelial production of nitric oxide (NO) and prostaglandins (PG) may be greater in females than in males, increasing vasodilatory responses in females. Does sex influence the cardiovascular responses to dynamic exercise through estrogen-dependent modulation of NO and PG vasodilatory pathways? After the administration of hexamethonium, we assessed(More)
The purpose of this study was to determine if lowering carbohydrate (CHO) concentration in a sport drink influences gastric emptying, intestinal absorption, or performance during cycle ergometry (85 min, 60% VO(2peak)). Five subjects (25 +/- 1 y, 61.5 +/- 2.1 mL . kg(-1) . min(-1) VO(2peak)) ingested a 3% CHO, 6% CHO, or a water placebo (WP) beverage during(More)
The contribution of the malate valve in the regulation of steady-state photosynthesis was studied in transgenic potato (Solanum tuberosum L. cv Désirée) plants with altered expression of plastidic NADP-dependent malate dehydrogenase (NADP-MDH; EC 1.1.1.82). Mutant plants were obtained after transformation with the homologous Nmdh gene in antisense(More)
Sympathetic control of arteries and veins may be altered in hypertension. To test this hypothesis, constrictions of mesenteric arteries and veins caused by nerve stimulation and by norepinephrine (NE) and ATP were studied in vitro in tissues from deoxycorticosterone acetate (DOCA)-salt hypertensive and sham normotensive rats. In DOCA-salt arteries, the(More)
Abstinence from sexual intercourse represents a healthy choice for teenagers, as teenagers face considerable risk to their reproductive health from unintended pregnancy and sexually transmitted infections (STIs) including infection with the human immunodeficiency virus (HIV). Remaining abstinent, at least through high school, is strongly supported by(More)
Relatively brief changes in perfusion pressure and flow through arterioles occur in a number of conditions, such as in the flying environment and during such common everyday activities such as bending forward at the waist. Also, brief periods of negative vertical acceleration (G(z)) stress, which reduces perfusion in the lower body, has been shown to impair(More)
This report describes the implementation and evaluation of the Bronx-Lebanon Hospital Center Dental Faculty Development Program (DFDP) for fifteen participants: five advanced dental education faculty members and ten residents. The 100-hour DFDP, designed in the longitudinal immersion model for faculty development, was conducted in four phases at the(More)