Monte Carlo assessment of soil moisture effect on high-energy thermal neutron capture gamma-ray by 14N.

Among many conventional techniques, nuclear techniques have shown to be faster, more reliable, and more effective in detecting explosives. In the present work, neutrons from a 5 Ci Am-Be neutron source being in water tank are captured by elements of soil and landmine (TNT), namely (14)N, H, C, and O. The prompt capture gamma-ray spectrum taken by a NaI (Tl) scintillation detector indicates the characteristic photo peaks of the elements in soil and landmine. In the high-energy region of the gamma-ray spectrum, besides 10.829 MeV of (15)N, single escape (SE) and double escape (DE) peaks are unmistakable photo peaks, which make the detection of concealed explosive possible. The soil has the property of moderating neutrons as well as diffusing the thermal neutron flux. Among many elements in soil, silicon is more abundant and (29)Si emits 10.607 MeV prompt capture gamma-ray, which makes 10.829 MeV detection difficult. The Monte Carlo simulation was used to adjust source-target-detector distances and soil moisture content to yield the best result. Therefore, we applied MCNP4C for configuration very close to reality of a hidden landmine in soil.     

Anti-Fertility Effects of Different Fractions of Anethum Graveolens L. Extracts on Female Rats

Our previous studies showed the effects of aqueous and ethanol extracts of Anethum graveolens L. (dill) on female infertility. In the present study we investigated whether different fractions of this herb extract can cause infertility in rats. Female rats were divided into the control groups, the groups receiving either a low (0.5 g/kg)) or a high dose (5g/kg) of water, N-butanol, chloroform and ether fractions of the aqueous plant extract, and the groups receiving either a low (0.045 g/kg) or a high dose (0.45 g/kg) of the same fractions of ethanol extract. The mentioned doses were gavaged in 1mL for 10 days. Vaginal smears were prepared daily. Estradiol and progesterone levels were measured. The left oviduct and ovary were removed, their tissue subsequently being prepared in form of histology slides and stained using haematoxylin-eosin and Masson''s trichrome. Female rats assigned to each group were mated with males; after that, crown-rump lengths and weights of newborn rats were measured. Results showed that each fraction produced some changes such as hormonal level reduction (chloroform fraction), diestrus phase prolongation and infertility (water fraction), and increase in pregnancy duration (chloroform and ether fractions). We concluded that each fraction comprises only some of the mentioned components and therefore recommended the usage of crude extract, especially the aqueous one, in case infertility aims to be induced.     

Glucosamine alleviates scopolamine induced spatial learning and memory deficits in rats

Introduction and objectiveBeneficial effects of glucosamine in spatial learning and memory impairment induced by scopolamine has been evaluated in rats by using Morris water maze.MethodsMale Wistar rats were randomly divided into control, scopolamine and scopolamine plus glucosamine groups. All injections were given in 5 consecutive days and 30 min after each injection, the rats were tested in the Morris water maze test. Escape latency and path length to reach the hidden platform were subjected to analysis of variance [ANOVA].ResultsThe rats treated with scopolamine showed increased escape latency and path length to reach the hidden platform compared to control group (P < 0.001). Both escape latency and traveled path length to reach the hidden platform in glucosamine treated animals (1 and 2 g/kg) were significantly lower (P < 0.05 to P < 0.001) than in the scopolamine group.ConclusionThe results of this study showed that the glucosamine can inhibit scopolamine-induced impairments of spatial learning and memory in rats. Glucosamine might offer a promise in either the prevention or the treatment of neurodegenerative diseases such as Alzheimer's disease.     

A broader paradigm for understanding and treating heart failure

Several recent clinical trials in heart failure have failed to demonstrate improvements in survival, suggesting that new approaches must be adopted if there are to be further improvements in heart failure treatment. We propose a broader paradigm for heart failure care based on a chronic rather than an acute illness model. This approach recognizes a broader range of outcomes including patient-perceived health status, expanded populations of interest that more closely reflect the changing epidemiology of heart failure, and a wider scope of interventions that address co-morbidity and health behavior. This approach will require a rationally designed health care delivery system that applies the best available evidence to the care of individual patients with heart failure.     

Predictors of cardiologist care for older patients hospitalized for heart failure

Background

Studies have suggested that cardiologists may provide higher quality heart failure care than generalists. However, national rates of specialty care during hospitalization for heart failure and factors associated with care by a cardiologist are unknown.

Methods

We assessed specialty care in a sample of Medicare patients hospitalized nationwide with heart failure between 1998 and 1999 (n = 25,869). Multivariable hierarchical logistic regression models were used to identify factors independently associated with treatment by a cardiologist.

Results

One-quarter (25.5%) of patients had a cardiologist as their attending physician, 31.3% of patients received a cardiology consult, and 43.2% of patients were not treated by a cardiologist during hospitalization. Older patients (age <75 years: referent; age 75-84 years: risk ratio [RR], 0.92; 95% CI, 0.86-0.98; age ≥85 years: RR, 0.81; 95% CI, 0.74-0.88) and women (RR, 0.87; 95% CI, 0.83-0.93) were less likely to have an attending cardiologist. Patients with a history of heart failure (RR, 1.13; 95% CI, 1.06-1.20), coronary disease (RR, 1.23; 95% CI, 1.14-1.32), coronary artery bypass grafting (RR, 1.42; 95% CI, 1.32-1.42), or percutaneous transluminal coronary angioplasty (RR, 1.30; 95% CI, 1.19-1.42) were more likely to be treated by a cardiologist, whereas patients with chronic obstructive pulmonary disease (RR, 0.74; 95% CI, 0.70-0.79) and dementia (RR, 0.61; 95% CI, 0.54-0.70) were less likely to be treated by a cardiologist. Patient race was not associated with treatment by a cardiologist. The strongest predictors of attending cardiology care were hospital factors, including large volume (>300 beds; RR, 1.45; 95% CI, 1.32-1.42) and geographic location (RR, 1.00 Northeast (referent) vs RR, 0.55; 95% CI 0.46-0.65 Midwest).

Conclusions

Slightly more than half of older patients with heart failure received care from a cardiologist. Several patient characteristics, including age and sex, were associated with the use of specialty care, suggesting that factors other than clinical presentation may independently influence the use of specialty care.