Effects of Sintering Temperature Variation on Synthesis of Glass-Ceramic Phosphor Using Rice Husk Ash as Silica Source

In this study, the authors attempted to propose the very first study on fabrication and characterization of zinc-boro-silicate (ZBS) glass-ceramics derived from the ternary zinc-boro-silicate (ZnO)_0.65(B₂O₃)_0.15(RHA)_0.2 glass system through a conventional melt-quenching method by incorporating rice husk ash (RHA) as the silica (SiO₂) source, followed by a sintering process. Optimization of sintering condition has densified the sintered samples while embedded beta willemite (β-Zn₂SiO₄) and alpha willemite (α-Zn₂SiO₄) were proven in X-ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FESEM) has shown the distribution of willemite crystals in rhombohedral shape crystals and successfully form closely-packed grains due to intense crystallization. The photoluminescence (PL) spectra of all sintered ZBS glasses presented various emission peaks at 425, 463, 487, 531, and 643 nm corresponded to violet, blue, green, and red emission, respectively. The correlation between the densification, phase transformation, microstructure, and photoluminescence of Zn₂SiO₄ glass-ceramic phosphor is discussed in detail.     

Medical and surgical treatment of acute right ventricular failure

Acute right ventricular (RV) failure is a frequent and serious clinical challenge in the intensive care unit. It is usually seen as a consequence of left ventricular failure, pulmonary embolism, pulmonary hypertension, sepsis, acute lung injury or after cardiothoracic surgery. The presence of acute RV failure not only carries substantial morbidity and mortality, but also complicates the use of commonly used treatment strategies in critically ill patients. In contrast to the left ventricle, the RV remains relatively understudied, and investigations of the treatment of isolated RV failure are rare and usually limited to nonrandomized observations. We searched PubMed for papers in the English language by using the search words right ventricle, right ventricular failure, pulmonary hypertension, sepsis, shock, acute lung injury, cardiothoracic surgery, mechanical ventilation, vasopressors, inotropes, and pulmonary vasodilators. These were used in various combinations. We read the abstracts of the relevant titles to confirm their relevance, and the full papers were then extracted. References from extracted papers were checked for any additional relevant papers. This review summarizes the general measures, ventilation strategies, vasoactive substances, and surgical as well as mechanical approaches that are currently used or actively investigated in the treatment of the acutely failing RV.     

Antihypertensive and cardiovascular effects of catechin-rich oil palm (Elaeis guineensis) leaf extract in nitric oxide-deficient rats

Oil palm (Elaeis guineensis) leaf extract (OPLE) possesses good ex vivo vasodilation and antioxidant properties. This study evaluated the catechin-rich OPLE antioxidant, antihypertensive, and cardiovascular effects in normal and nitric oxide (NO)-deficient hypertensive rats. OPLE was administered orally (500 mg/kg of body weight/day) to normotensive Wistar rats and N(ω)-nitro-L-arginine methyl ester (L-NAME)-induced NO-deficient hypertensive rats. OPLE significantly (P<.05) attenuated blood pressure increases, increased serum NO, reduced lipid peroxidation, and showed antioxidant effects in NO-deficient hypertensive rats. OPLE decreased the coronary arteriole wall-to-lumen ratio to near normal values under NO deficiency. Although OPLE showed good antihypertensive and antioxidant effects under NO deficiency, it was not hypotensive to normal rats and produced no chronic cardiovascular toxicity in any of the rats throughout the 12-week study. This is the first report on the in vivo antihypertensive properties of green tea catechins extracted from an alternative source, namely, oil palm leaf, for use as a medicinal food for hypertension and cardiovascular ailments.     

Recent Developments in Rodent Models of High-Fructose Diet-Induced Metabolic Syndrome: A Systematic Review

Metabolic syndrome (MetS) is the physiological clustering of hypertension, hyperglycemia, hyperinsulinemia, dyslipidemia, and insulin resistance. The MetS-related chronic illnesses encompass obesity, the cardiovascular system, renal operation, hepatic function, oncology, and mortality. To perform pre-clinical research, it is imperative that these symptoms be successfully induced and optimized in lower taxonomy. Therefore, novel and future applications for a disease model, if proven valid, can be extrapolated to humans. MetS model establishment is evaluated based on the significance of selected test parameters, paradigm shifts from new discoveries, and the accessibility of the latest technology or advanced methodologies. Ultimately, the outcome of animal studies should be advantageous for human clinical trials and solidify their position in advanced medicine for clinicians to treat and adapt to serious or specific medical situations. Rodents (Rattus norvegicus and Mus musculus) have been ideal models for mammalian studies since the 18th century and have been mapped extensively. This review compiles and compares studies published in the past five years between the multitude of rodent comparative models. The response factors, niche parameters, and replicability of diet protocols are also compiled and analyzed to offer insight into MetS-related disease-specific modelling.     

Prostate cancer diagnosed before 55: a retrospective study from the Rare Cancer Network

This retrospective study on a large number of cases offers a vision of the modalities of care in prostate cancer diagnosed before the age of 55, according to different policies, aiming to propose other directions for 2005. Between January 1974 and December 2001, 365 patients had a pathological diagnosis of prostate cancer occurring before the age of 55. These patients were referred to the departments of radiation therapy affiliated to the Rare Cancer Network. A questionnaire was filled in retrospectively to allow further analysis of medical and surgical data. The treatments were those recommended at the time of analysis and progressed according to new accepted standards. Clinical and pathological features of the patients were as follows: 36% of the tumours were Gleason > 7 scored, 56% of the patients had a T3-T4 and 31 had metastases at the time of diagnosis. As far as treatment was concerned, 4 groups were considered: 83 patients had a radical prostatectomy, 155 received radiation therapy with a curative intent, 87 were treated by hormonal manipulation, and the remaining 40 patients received palliative care. The free of disease survival rate at 10 years was 38% for patients without immediate metastases, only 1% of patients with metastases were alive. The multivariate analysis demonstrated the significant impact of radiotherapy on both local and distant failure rates and of T stage on distant failure rate. Survival was affected by nodal involvement and local failure. A separate analysis of two periods of time (1974-1989 and 1990-2001) did not show any differences in terms of treatment results. This retrospective study suggests that age is not a negative prognostic factor as far as adequate curative treatments are carried out. Therapeutic modalities having considerably evolved in prostate cancer, a further analysis with a longer follow up may allow the evaluation of these treatments on rates of failures and survival. Screening for prostate cancer in family histories is likely to increase the number of cases diagnosed before 55. Therefore, a complete information on morbidity associated to the different means of treatment would lead to a better acceptance of late side effects.