Longitudinal relationships between nutritional status, body composition, and physical fitness in rural children of South Africa: The Ellisras longitudinal study.

The objective of this study was to investigate the development and tracking of nutritional status, body composition and physical fitness, and the longitudinal relationship of changes in nutritional status, and body composition with changes in physical fitness over a 1-year period of follow-up. Studied were 380 boys and 322 girls aged 7-14 years from the Ellisras Longitudinal Study. Boys and girls were divided into two groups of pre-adolescence (<11 years) and adolescence (>10 years). High tracking coefficients (>8) were found for nutritional status, body mass index, and fat-free mass, while low tracking coefficients (<4) were found for the sum of skinfolds, fat mass, arm muscle area, and central fat distribution. Moderate and low tracking coefficients were found for the physical fitness items. Longitudinal regression analyses showed that physical fitness performances that require a high energy flux over a short period of time are affected by muscle wasting, whereas having a low body weight appears to be important for a good performance on other fitness items in these malnourished rural South African children.     

Lung preservation solution substrate composition affects rat lung oxidative metabolism during hypothermic storage

Lungs harvested for transplantation utilize oxygen after procurement. We investigated the effects of storage solution substrate composition on pulmonary oxidative metabolism and energetics during the preservation interval. Rat lungs were harvested and stored at 10 degrees C in low-potassium dextran (LPD) solution. Groups of lungs were preserved with preservation solution containing 5mM carbon-13 ((13)C) labeled glucose or increasing concentrations of (13)C labeled pyruvate. Additional groups of rat lungs were studied with dichloroacetate (DCA) added to the pyruvate-modified preservation solutions. Oxidative metabolism (measured by (13)C-enrichment of glutamate) and adenine nucleotide levels were quantified. Increasing preservation solution pyruvate concentration augmented glutamate (13)C-enrichment up to a concentration of 32mM pyruvate. DCA further stimulated oxidative metabolism only at lower concentrations of pyruvate (4 and 8mM). ATP and ADP were not different among groups, but AMP levels were higher in the glucose group. These data suggest that altering the substrate composition of the preservation solution influences lung metabolism during allograft preservation for transplantation.     

Entamoeba invadens contains the components of a classical adrenergic signaling system

Epinephrine (Epi) was previously found to bypass the need for galactose ligands during early steps in the initiation of Entamoeba encystment. Epinephrine is presumed to act on amoebae through a classical adrenergic signaling pathway that results in the increased production of cyclic adenosine monophosphate (cAMP). The object of this study was to verify the existence of an adrenergic like pathway and its response to Epi in both whole Entamoeba trophozoites and purified plasma membrane preparations. Whole trophozoite and purified membrane preparations from Entamoeba invadens responded to the presence of Epi by increasing the production of cAMP. The modulators of heterotrimeric G protein signaling, forskolin (FK), pertussis toxin (PTX) and cholera toxin (CTX), also increased cAMP levels in whole cells and membrane fragments. All of these increases in cAMP were inhibited by specific inhibitors of adenylyl cyclase (AC). Treatment of membrane fragments with epinephrine caused an increased binding of non-hydrolysable GTP analogs. Entamoeba trophozoites therefore appear to contain G-protein-regulated adenylyl cyclase that functions downstream of an adrenergic ligand receptor.     

Temporal expression and cellular origin of CC chemokine receptors CCR1, CCR2 and CCR5 in the central nervous system: insight into mechanisms of MOG-induced EAE

Background  

The CC chemokine receptors CCR1, CCR2 and CCR5 are critical for the recruitment of mononuclear phagocytes to the central nervous system (CNS) in multiple sclerosis (MS) and other neuroinflammatory diseases. Mononuclear phagocytes are effector cells capable of phagocytosing myelin and damaging axons. In this study, we characterize the regional, temporal and cellular expression of CCR1, CCR2 and CCR5 mRNA in the spinal cord of rats with myelin oligodendrocyte glycoprotein-induced experimental autoimmune encephalomyelitis (MOG-EAE). While resembling human MS, this animal model allows unique access to CNS-tissue from various time-points of relapsing neuroinflammation and from various lesional stages: early active, late active, and inactive completely demyelinated lesions.     

Early appearance of inhibitory input to the MNTB supports binaural processing during development

Despite the peripheral and central immaturities that limit auditory processing in juvenile animals, they are able to lateralize sounds using binaural cues. This study explores a central mechanism that may compensate for these limitations during development. Interaural time and level difference processing by neurons in the superior olivary complex depends on synaptic inhibition from the medial nucleus of the trapezoid body (MNTB), a group of inhibitory neurons that is activated by contralateral sound stimuli. In this study, we examined the maturation of coding properties of MNTB neurons and found that they receive an inhibitory influence from the ipsilateral ear that is modified during the course of postnatal development. Single neuron recordings were obtained from the MNTB in juvenile (postnatal day 15-19) and adult gerbils. Approximately 50% of all recorded MNTB neurons were inhibited by ipsilateral sound stimuli, but juvenile neurons displayed a much greater suppression of firing as compared with those in adults. A comparison of the prepotential and postsynaptic action potential indicated that inhibition occurred at the presynaptic level, likely within the cochlear nucleus. A simple linear model of level difference detection by lateral superior olivary neurons that receive input from MNTB suggested that inhibition of the MNTB may expand the response of LSO neurons to physiologically realistic level differences, particularly in juvenile animals, at a time when these cues are reduced.     

基于UPLC-Q-TOF-MS的建昌帮砂仁陈皮制熟地黄适宜炮制时间分析

目的：研究建昌帮砂仁陈皮制熟地黄炮制过程中差异代谢物和苷类分解产物还原糖的相对含量变化,为揭示该特色品种的炮制原理奠定基础。方法：以建昌帮砂仁陈皮制熟地黄的0～54 h炮制过程样品为研究对象,运用超高效液相色谱-四极杆-飞行时间质谱法（UPLC-Q-TOF-MS）检测其次级代谢产物,以0.1%甲酸水溶液（A）-乙腈（B）为流动相进行梯度洗脱（0～1 min,1%～3%B;1～10 min,3%～9%B;10～15 min,9%～12%B;15～22 min,12%～18%B;22～31 min,18%～24%B;31～35 min,24%～100%B;35～36 min,100%～5%B;36～40 min,5%～1%B;40～45 min,1%B）,柱温40℃,进样量3μL,流速0.3 mL·min-1;运用电喷雾离子源（ESI）,在负离子模式下进行扫描并采集MS数据,扫描范围m/z 50～1 250,利用PeakView 1.2进行数据分析,结合文献信息及化学成分数据库对砂仁陈皮制熟地黄化学成分进行鉴定;MS数据通过MarkerView 1.2归一化处理后应用多元统计分析方法找出差...     

长效可逆避孕措施在人工流产后即刻实施的效果评价

目的探究长效可逆避孕措施在人工流产后即刻实施的效果。方法从2017年7月-2018年7月,抽选在广州市增城区妇幼保健院行人工流产女性1200例,按照随机数字表法分为常规组(612例)和强化干预组(588例)。常规组给予常规流产后关爱(PAC)服务,强化干预组在常规PAC服务的基础上采用长效可逆避孕措施。对比两组长效可逆避孕措施使用情况、重复人工流产率以及避孕措施的持续时间情况。结果强化干预组的高效避孕措施使用率比常规组更高,同时重复人工流产率比常规组低,差异有统计学意义(P<0.05);强化干预组长效可逆避孕措施LARC(IUS/IUD)避孕术后6个月、1年使用率明显高于常规组,差异有统计学意义(P<0.05);复方口服避孕药优思悦(COC)避孕术后3个月、6个月、1年的使用率比常规组高,差异有统计学意义(P<0.05)。结论人工流产后即刻实施长效可逆避孕措施,可提升高效避孕措施的使用率,减少意外妊娠及再次人工流产的几率,值得推广。     

Gastrointestinal Contributions to the Postprandial Experience

Food ingestion induces homeostatic sensations (satiety, fullness) with a hedonic dimension (satisfaction, changes in mood) that characterize the postprandial experience. Both types of sensation are secondary to intraluminal stimuli produced by the food itself, as well as to the activity of the digestive tract. Postprandial sensations also depend on the nutrient composition of the meal and on colonic fermentation of non-absorbed residues. Gastrointestinal function and the sensitivity of the digestive tract, i.e., perception of gut stimuli, are determined by inherent individual factors, e.g., sex, and can be modulated by different conditioning mechanisms. This narrative review examines the factors that determine perception of digestive stimuli and the postprandial experience.     

Effects of a Short-Term “Fat Adaptation with Carbohydrate Restoration” Diet on Metabolic Responses and Exercise Performance in Well-Trained Runners

Periodized carbohydrate availability can enhance exercise capacity, but the effects of short-term fat adaptation carbohydrate restoration (FACR) diets on metabolic responses and exercise performance in endurance athletes have not been conclusively determined. This study aimed to investigate the effect of a FACR diet on measures of resting metabolism, exercise metabolism, and exercise performance. Well-trained male runners (n = 8) completed a FACR dietary intervention (five days’ carbohydrate < 20% and fat > 60% energy, plus one-day carbohydrate ≥ 70% energy), and a control high-carbohydrate (HCHO) diet for six days (carbohydrate > 60% energy; fat < 20% energy) in a randomized crossover design. Pre- and post-intervention metabolic measures included resting metabolic rate (RMR), respiratory quotient (RQ), maximum fat oxidation rate during exercise (MFO), and maximum fat oxidation intensity (FATmax). Measures of exercise performance included maximal oxygen uptake (VO₂max), running economy (RE), and 5 km running time trial (5 km-TT). In FACR compared with HCHO, there were significant improvements in FATmax (p = 0.006) and RE (p = 0.048). There were no significant differences (p > 0.05) between FACR and HCHO in RMR, RQ, VO₂max, or 5 km-TT. Findings suggest that a short-term (six days) FACR diet may facilitate increased fat oxidation and submaximal exercise economy but does not improve 5 km-TT performance.