نتایج جستجو برای: 21 and 30 percent
تعداد نتایج: 16931693 فیلتر نتایج به سال:
Simple methods were developed for cloning human solid tumors; 68 percent of the tumors processed formed at least 30 colonies within two to four weeks. The accuracy of the clonogenic assay for predicting clinical response was determined in a prospective, correlative study. Eight-four patients had objectively measurable disease and had at least one course of chemotherapy. Tumor types included mel...
We estimate the effect of alcohol consumption on mortality using the minimum drinking age in a regression discontinuity design. We find large and immediate increases in drinking at age 21, including a 21 percent increase in recent drinking days. We also find a discrete 9 percent increase in the mortality rate at age 21, primarily due to motor vehicle accidents, alcohol-related deaths, and suici...
BACKGROUND The objective was to investigate the use of autologous red blood cells (RBCs) derived from umbilical cord blood (UCB), as an alternative for allogeneic transfusions in premature infants admitted to a tertiary neonatal center. STUDY DESIGN AND METHODS UCB collection was performed at deliveries of less than 32 weeks of gestation and processed into autologous RBC products. Premature i...
BACKGROUND Screening for aneuploid pregnancies is routinely performed after 15 weeks of gestation and has a sensitivity of approximately 65 percent, with a false positive rate of 5 percent. First-trimester markers of aneuploidy have been developed, but their use in combination has not been adequately evaluated in clinical practice. METHODS We conducted a multicenter study of screening for tri...
The microstructure, mechanical properties (at 25 °C, 1000 1200 1400 °C and 1600 °C) oxidation behavior of a binary Hf-27%Ta alloy three ternary alloys, Hf-21%Mo-21%Ta, Hf-21%Nb-21%Ta Hf-21%Ta-21%W (compositions are in atomic percent) reported. alloys were produced by vacuum arc melting, hot isostatically pressed under high-purity argon pressure 207 MPa at for 3 h slow cooled to room temperature...
The histopathologic diagnosis of sarcoidosis requires the presence of noncaseating granulomas. Transbronchoscopic lung biopsy (TBLB) has been considered the procedure of choice when less invasive tissue samples are unavailable. A total of 51 consecutive patients suspected of having sarcoidosis underwent combined TBLB and flexible transbronchial needle aspirate (TBNA). In 18 of the 30 patients (...
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