Real-Time Operating System/360

RTOS has a cost savings advantage for real-time applications, such as those with random inputs requiring a flexible data routing facility, display systems simplified by a device independent interface language, and complex applications needing added storage protection and data queuing

Mnaganese(IV) as an Analytical Reagent for Determination of Tellurium

21

Determination of V(V) & Cr(VI) in Presence of Chloride

71-7

Optimal gestational age for delivery in uncomplicated dichorionic twin pregnancies : a population-based study

Objectives: To identify the optimal gestational age for delivery in uncomplicated dichorionic twin pregnancies. Study Design: A retrospective analysis of gestational age-specific neonatal morbidity and mortality data was performed for 254 uncomplicated dichorionic twin pregnancies. Outcome measures included 1st and 5th minute Apgar scores, NICU admission, RDS, TTN, sepsis, seizure, hyperbilirubinemia, hypoglycaemia, neonatal length of hospital stay, birthweight and overall outcome. After correcting for confounding variables by regression analysis, adverse variable trends were assessed in each of the gestational-age- at-birth groups. Results: A significant drop in the incidence of LBW, RDS, TTN and hypoglycaemia, accompanied with the lowest NICU admission rate and neonatal length of hospital stay occurred concordantly at 38 completed weeks of gestation. The incidence of severe hyperbilirubinemia requiring phototherapy decreased significantly by 36 weeks. No correlation was found between advancing gestation and foetal, perinatal or neonatal mortality. Conclusion: Elective delivery in uncomplicated dichorionic twin pregnancies should be delayed until at least 38 completed weeks of gestation as this significantly reduces neonatal morbidity with no impact on mortality.peer-reviewe

A Dissolution-Precipitation Mechanism is at the Origin of Concrete Creep in Moist Environments

Long-term creep (i.e., deformation under sustained load) is a significant material response that needs to be accounted for in concrete structural design. However, the nature and origin of concrete creep remain poorly understood and controversial. Here, we propose that concrete creep at relative humidity ≥ 50%, but fixed moisture content (i.e., basic creep), arises from a dissolution-precipitation mechanism, active at nanoscale grain contacts, as has been extensively observed in a geological context, e.g., when rocks are exposed to sustained loads, in liquid-bearing environments. Based on micro-indentation and vertical scanning interferometry data and molecular dynamics simulations carried out on calcium-silicate-hydrate (C-S-H), the major binding phase in concrete, of different compositions, we show that creep rates are correlated with dissolution rates - an observation which suggests a dissolution-precipitation mechanism as being at the origin of concrete creep. C-S-H compositions featuring high resistance to dissolution, and, hence, creep are identified. Analyses of the atomic networks of such C-S-H compositions using topological constraint theory indicate that these compositions present limited relaxation modes on account of their optimally connected (i.e., constrained) atomic networks

First-line imatinib vs second- and third-generation TKIs for chronic-phase CML: a systematic review and meta-analysis

Imatinib, the first tyrosine kinase inhibitor (TKI) for the treatment of chronic myeloid leukemia (CML), improves overall survival (OS), but the introduction of newer TKIs requires the definition of the optimal first-line TKI for newly diagnosed Philadelphia chromosome-positive (Ph+) chronic-phase (CP) CML. This systematic review of randomized controlled trials (RCTs) compares the efficacy and safety of imatinib vs second-generation (dasatinib, nilotinib, bosutinib) and third-generation TKIs (ponatinib) in adults with newly diagnosed Ph+ CP CML, concentrating on OS, progression-free survival (PFS), and hematological and nonhematological adverse events. The quality of the evidence was assessed using the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) method. Seven RCTs published between 1990 and 2019 (involving 3262 participants) satisfied the eligibility criteria. Two RCTs (imatinib vs nilotinib and imatinib vs dasatinib) found no difference in 5-year OS or PFS. Second- and third-generation TKIs improved 3-month major molecular responses (relative risk [RR], 4.28; 95% confidence interval [CI], 2.20-8.32) and other efficacy outcomes, decreased accelerated/blastic-phase transformations (RR, 0.44; 95% CI, 0.26-0.74), but were associated with more cases of thrombocytopenia (RR, 1.57; 95% CI, 1.20-2.05), cardiovascular events (RR, 2.54; 95% CI, 1.49-4.33), and pancreatic (RR, 2.29; 95% CI, 1.32-3.96) and hepatic effects (RR, 3.51; 95% CI 1.55-7.92). GRADE showed that the certainty of the evidence ranged from high to moderate. This study shows that, in comparison with imatinib, second- and third-generation TKIs improve clinical responses, but the safer toxicity profile of imatinib may make it a better option for patients with comorbidities