Texas Medical Center

About: Texas Medical Center is a healthcare organization based out in Houston, Texas, United States. It is known for research contribution in the topics: Population & Cancer. The organization has 2845 authors who have published 2394 publications receiving 79426 citations.

Duration of the phases of mechanical systole in infants and children

Abstract: In the present investigation, determinations of the duration of mechanical systole and left ventricular ejection were made from simultaneous recordings of the heart sounds and the carotid or axillary arterial pulsation in older children and in mature and premature neonatal infants without cardiovascular disease. In older children and mature neonates with heart rates ranging from 69 to 196 beats/min., both duration of total systole and left ventricular ejection time diminished linearly and in parallel with increasing heart rate up to a level of 150 beats/min. At high levels of heart rate the phases of systole diminished more gradually with increasing heart rate. The isovolumetric contraction time tended to remain constant throughout the range of heart rates studied. Among the premature neonates there was a wider distribution in the measured intervals, and left ventricular ejection time tended to be higher at any level of heart rate. The prolonged ejection time in this group can in part be attributed to the presence of anemia.

Field Application of Chelated Calcium: Postharvest Effects on Cantaloupe and Honeydew Fruit Quality

Abstract: Commercially grown honeydew fruit (Cucumis melo Inodorus group) and netted cantaloupe fruit (C. melo Reticulatus group) in lowhumidity regions of the U.S. are typically fi eld packed, eliminating the possibility for postharvest chelatedcalcium dip treatments to extend fruit shelf life. In this study, calcium treatments were applied to orange-fl esh honeydew fruit commercially grown in 2001 and 2002 in Sacramento Valley, Calif. and orange-fl eshed netted cantaloupe fruit commercially grown in 2002 in Imperial Valley, Calif., and Rio Grande Valley, Texas. Aminoacid-chelated calcium and mannitolcomplexed calcium compounds were applied to fi eld-grown plants at the rate of 2.3 L·ha–1 (1 qt/acre) at 0, 1, 2, or 4 total applications during growth of honeydew and cantaloupe fruit. Applications were A) at female fl owering, B) within 15 days (cantaloupe) or 20 days (honeydew) after fl owering, C) within 30 days (cantaloupe) or 40 days (honeydew) after