碳酸氢铵体外杀灭日本血吸虫虫卵的实验观察

目的观察碳酸氢铵体外杀灭日本血吸虫虫卵的药效。方法以碳酸氢铵作为实验组,以敌百虫作为阳性对照组,以清水作为空白对照组。在室温下用不同浓度的农用碳酸氢铵,作用于一定数量的含有日本血吸虫虫卵的小鼠粪便和肠道组织。观察不同时间、不同碳酸氢铵浓度下虫卵的孵化情况。结果在室温下农用碳酸氢铵在200mg/L浓度时浸泡含有日本血吸虫虫卵的小鼠粪便和肠道组织,12h、24h日本血吸虫虫卵的孵化率为0。200mg/L的碳酸氢铵体外持效观察7天内均能有效抑制和杀灭虫卵。结论碳酸氢铵体外在200mg/L时有明显抑制和杀灭日本血吸虫虫卵的作用。     

基于形态学滤波的寄生虫卵图像混合分割算法

寄生虫卵的自动识别是当今寄生虫医学图像处理的一个重要课题,目前已有算法一般都要求寄生虫标本杂质含量较少。提出一种基于形态学滤波的混合分割算法,首先采用B颜色信号提取有用信息,接着利用改进的形态学操作进行滤波,除去大量杂质及虫卵边缘粘合物,最后结合凸包运算并定义两个图像特征参数,即边界光滑度和区域填充度,做进一步选择。实验结果表明,该算法明显优于当前的一些虫卵分割算法,能充分利用虫卵的有用信息,有效剔除杂质,大大降低虚假目标。虫卵边界保留完整清晰,为寄生虫卵的自动识别打下了良好基础。     

In vitro anthelmintic effect of Anogeissus leiocarpus (DC.) Guill. & Perr. leaf extracts and fractions on developmental stages of Haemonchus contortus

The anthelmintic effect of acetone leaf extract and fractions of Anogeissus leiocarpus was investigated to determine the relative efficacy of the components as anthelmintic against Haemonchus contortus (Rudolphi). The fractions were obtained by solvent-solvent group separation of the leaf extract. The fractions were evaluated for ovicidal and larvicidal activity by egg hatch inhibition assay and larval development viability assay. Best-fit LC(50) values for egg hatch test were 0.360, 0.316, 0.093, 0.219 and 0.196 mg/ml for the crude acetone extract, hexane, chloroform, butanol, and 35% water in methanol fractions, respectively. While the best-fit LC(50) values for larval development and viability test were 0.509, 0.162, 0.186, 0.288 and 0.130 mg/ml for the crude acetone extract, hexane, chloroform, butanol, and 35% water in methanol fractions, respectively. The 35% water in methanol fractions was the more active on larvae, although differences in activity between fractions were not significant (p>0.05). A. leiocarpus leaf extracts could find application in anthelmintic therapy in veterinary practice.     

The Effects of Eggs in a Plant-Based Diet on Oxidative Stress and Inflammation in Metabolic Syndrome

We recently reported that the inclusion of whole eggs in plant-based diets (PBD) increased plasma choline, lutein, and zeaxanthin in individuals with metabolic syndrome (MetS). The objective of the current study was to evaluate whether this dietary pattern would protect against oxidative stress and low-grade inflammation, two common characteristics of MetS. We recruited 24 men and women with MetS, who, after following a PBD for 2 weeks (baseline), were randomly allocated to consume either two whole eggs with 70 g of spinach/day (EGG) or the equivalent amount of egg substitute with spinach (SUB) as breakfast for 4 weeks. After a 3-week washout, they were allocated to the alternate breakfast. We measured biomarkers of oxidation and inflammation at baseline and at the end of each intervention. Tumor necrosis factor-alpha, interleukin-6, monocyte protein attractant-1, liver enzymes, and C-reactive protein, as well as total antioxidant capacity, paraoxonase-1 (PON-1) activity, and other biomarkers of oxidation were not different at the end of EGG or SUB or when compared to baseline. However, plasma malondialdehyde (MDA) concentrations were lower (p < 0.05) during the EGG and baseline compared to SUB. In addition, the increases in dietary lutein and zeaxanthin previously observed had a strong positive correlation with PON-1 activity (r = 0.522, p < 0.01) only during the EGG period, whereas plasma zeaxanthin was negatively correlated with MDA (r = −0.437, p < 0.01). The number of participants with MetS was reduced from 24 during screening to 21, 13, and 17 during the BL, EGG, and SUB periods, respectively, indicating that eggs were more effective in reversing the characteristics of MetS. These data suggest that adding eggs to a PBD does not detrimentally affect inflammation or oxidative stress; on the contrary, eggs seem to provide additional protection against the biomarkers that define MetS.     

Infant age at egg introduction and malnutrition‐related child growth in the United States

To evaluate the relationship between infant age of egg introduction and malnutrition‐related growth outcomes in the United States, we analysed secondary data of 1716 mother–child dyads in the Infant Feeding Practices Study II and its Year 6 Follow‐Up Study. Malnutrition‐related growth outcomes included body mass index z‐score (BMIZ), obesity (weight‐for‐height z‐score [WHZ] ≥3 or BMIZ ≥ 2), WHZ, wasting (WHZ < −2), height‐for‐age z‐score (HAZ), and stunting (HAZ < –2). Infant age at egg introduction was analysed as a continuous variable. We used generalised estimating equations to estimate the mean difference in continuous outcomes and relative risk [RR]) for binary outcomes, adjusting for related maternal and child confounders. We also explored interactions with child sex, maternal race/ethnicity, maternal educational level, ever breastfeeding, and formula feeding. In the total sample, a later infant age at egg introduction was associated with a lower mean difference in HAZ (confounder‐adjusted mean difference = −0.08, 95% confidence interval [CI]: −0.12 to −0.03 per month) and a higher risk of stunting (confounder‐adjusted RR = 1.17, 95% CI: 1.03–1.33 per month) at 6 years. The associations between infant age at egg introduction and 12‐month growth outcomes differed by child sex. Among females but not among males, later introduction of eggs was associated with a lower mean WHZ (−0.06 [−0.12 to 0.00] per month) at 12 months. Later egg introduction during infancy was associated with a lower mean HAZ and a higher risk of stunting in 6‐year‐old children. Besides this, it was associated with a lower WHZ among females at 12 months.     

The association between plasma choline,growth and neurodevelopment among Malawian children aged 6–15 months enroled in an egg intervention trial

Choline is an essential micronutrient that may influence growth and development; however, few studies have examined postnatal choline status and children's growth and development in low- and middle-income countries. The aim of this observational analysis was to examine associations of plasma choline with growth and development among Malawian children aged 6–15 months enrolled in an egg intervention trial. Plasma choline and related metabolites (betaine, dimethylglycine and trimethylamine N-oxide) were measured at baseline and 6-month follow-up, along with anthropometric (length, weight, head circumference) and developmental assessments (the Malawi Developmental Assessment Tool [MDAT], the Infant Orienting with Attention task [IOWA], a visual paired comparison [VPC] task and an elicited imitation [EI] task). In cross-sectional covariate-adjusted models, each 1 SD higher plasma choline was associated with lower length-for-age z-score (−0.09 SD [95% confidence interval, CI −0.17 to −0.01]), slower IOWA response time (8.84 ms [1.66–16.03]) and faster processing speed on the VPC task (−203.5 ms [−366.2 to −40.7]). In predictive models, baseline plasma choline was negatively associated with MDAT fine motor z-score at 6-month follow-up (−0.13 SD [−0.22 to −0.04]). There were no other significant associations of plasma choline with child measures. Similarly, associations of choline metabolites with growth and development were null except higher trimethylamine N-oxide was associated with slower information processing on the VPC task and higher memory scores on the EI task. In this cohort of children with low dietary choline intake, we conclude that there were no strong or consistent associations between plasma choline and growth and development.     

The importance of eggs in an environmentally sustainable diet

Food and diet globally have a significant environmental impact. Whilst there is broad agreement on the principles underpinning a healthy, sustainable diet, the interpretation of what it might mean in practice is widely debated. Misconceptions are common, including around the environmental impact of eggs and their place in a healthy, sustainable diet. Eggs are often categorised with other animal proteins such as beef, lamb, poultry, meat and dairy when reporting on the potential environmental impact of food and diets. However, the shift towards more planet-friendly diets demands a clear understanding of the evidence base on which such a diet should be based. This review evaluates scientific reports and peer-reviewed articles that have evaluated the environmental impact of hens' eggs in terms of greenhouse gas emissions (GHGEs), and land and water use and compared the impacts of eggs with those of other animal and plant proteins. This overview shows that eggs are responsible for less carbon, land and water use than other animal proteins, particularly beef and only slightly more than most plant proteins. Eggs are a nutritious, convenient and relatively inexpensive food, which traditionally has had an important place in the diet both in the United Kingdom and globally. It is therefore important to understand where they fit in terms of environmental impact and into advice on healthier, more sustainable dietary patterns.