Nutritive Substitution of Zinc by Cadmium and Cobalt in Phytoplankton Isolated from the Lower Great Lakes

Low ambient concentrations of trace metals including Zn may limit phytoplankton productivity in the North American Great Lakes. The microalgae Chlorella sp. UTCC 522 (Chlorophyta) and Cyclotella sp. UTCC 520 (Heterokontophyta), indigenous to the Great Lakes, were assayed for their Zn requirement and the ability for Co and Cd to metabolically substitute for Zn under conditions in which Zn bioavailability was limiting cell growth. Bioassays were conducted in the laboratory using chemically defined media and the metal buffer EDTA to control the free-ion concentrations of Zn²⁺ (10^−15.3−10⁻¹⁰ mol/L), Cd²⁺ (10^−15.1−10⁻¹⁰ mol/L), and Co²⁺ (10⁻¹⁴−10⁻¹⁰ mol/L). Influence of the metals on the phytoplankton was measured by the effect on specific growth rate. Both microalgae required Zn and could use Co and Cd as Zn substitutes; Cd was used less-effectively, although to a greater extent by the diatom Cyclotella than by the chlorophyte, Chlorella. The observed ability of the phytoplankton to use Cd and Co as Zn substitutes suggests that microalgae play an important role in the geochemical cycling of Zn, Cd and Co in large lakes, and the mobilization of Cd in lake ecosystems impacted by pollution.     

Fortified food made by the extrusion of a mixture of chickpea,corn and bovine lung controls iron-deficiency anaemia in preschool children

A fortified food that was rich in protein, vitamins and iron made of chickpea, bovine lung and corn was developed with the aim of controlling iron-deficiency anaemia in children from poorer areas. It was tested in Teresina, State of Piauí, Northeastern Brazil, on a population with high anaemia prevalence. Two local daycare units with similar characteristics were selected and the children at one of them received a 30 g pack three times a week, representing a total iron daily intake of 6.96 mg. The other daycare unit was followed as a control. The capillary haemoglobin concentration was determined for the children at both daycare units, at the beginning of the study and after a two-month intervention period. The mean haemoglobin concentration in the test group at the beginning of the intervention was 11.8 g/dL, which increased to 13.1 g/dL at the end of the intervention. In the control group these figures remained practically constant (11.6–11.8 g/dL). These represented a dramatic and significant drop in anaemia prevalence, from 61.5% to 11.5% in the test group, and an insignificant reduction (63.1–57.7%) in the control group. The acceptance of the fortified snack was excellent and no undesirable effects were observed.     

A review of childhood and adolescent obesity interventions

Obesity is one of the largest health problems facing Americans. Figures produced by the National Center for Health Statistics show that in 1999-2002, 15.8% of 6-11-year-olds were overweight as were 16.1% of adolescents aged 12-19. Some have proposed that interventions in childhood may be the best place to focus efforts to reduce the growing obesity epidemic. This paper examines several of the popular intervention strategies that have been proposed for youth and assesses the potential of these interventions for meaningful public health impacts. Findings show that most childhood obesity interventions completed to date produced only meager results, creating need for more well-designed studies that are tailored to the needs of specific age, ethnic and economic groups.     

强化营养盐及相关食品添加剂

文章概述了使用强化食品的原因,食品添加剂(营养素)的种类、性质、生理功能.重点介绍了强化营养盐状况、强化营养盐食品添加剂的类别、性质和强化营养盐标准及管理要求.     

Effects of starter protein content and alkali processing of wheat straw on growth,ruminal fermentation,and behavior in Holstein calves

The present study was conducted to investigate the effects of crude protein (CP) content of starter feed and wheat straw (WS) processing on growth performance, digestibility, ruminal fermentation, and behavior of Holstein calves. Sixty calves (28 male and 32 female) were randomly assigned to 1 of 4 treatments in a randomized complete block design. Treatments in a 2 × 2 factorial arrangement were (1) lower-CP ground starter feed mixed with alkali-processed WS (LP-PWS), (2) lower-CP ground starter feed mixed with unprocessed WS (LP-WS), (3) higher-CP ground starter feed mixed with alkali-processed WS (HP-PWS), and (4) higher-CP ground starter feed mixed with unprocessed WS (HP-WS). Wheat straw was fed at 4.75% of dry matter (DM), and low-protein (LP) and high-protein (HP) starter feed contained 19.5 and 23.5% CP, respectively. The calves were weaned on d 60 and remained in the study until d 75. During the experiment, the calves received 4.2 kg of whole milk per day and had free access to fresh water and starter feed. The interaction between WS processing and protein content of starter tended to be significant for starter feed intake, average daily gain (ADG), and body weight (BW); calves fed HP-PWS tended to have greater ADG and final BW than other treatments. The results showed that feeding HP ground starter feed increased ADG and feed efficiency compared with LP groups during the preweaning and the overall periods. Moreover, weaning and final BW were higher in HP-fed calves than in LP-fed calves. Apparent digestibilities of acid detergent fiber (ADF), starch, and CP were greater in calves fed HP than in calves fed LP starter feed. The HP ground starter feed increased rumen propionate and ammonia concentrations. Wheat straw processing had no effect on intake and growth of calves but increased DM, ADF, and neutral detergent fiber digestibilities and decreased ruminal pH. Using processed wheat straw (PWS) mixed with starter feed tended to decrease rumination time and ruminal acetate concentration in calves. Final body barrel and withers height tended to be greater in calves fed PWS. Overall, the results indicated that HP content of ground starter feed (23.5%) could be recommended for Holstein calves. Furthermore, PWS inclusion in the ground starter diet increased fiber digestibility but had no effect on calf performance. Moreover, calves fed HP-PWS had greater ADG and final BW than other treatments.     

绿豆营养口服液的研制

以绿豆为主要原料,经蛋白酶降解绿豆蛋白,α-淀粉酶和麸皮将淀粉浆进行液化和糖化,化学修饰,制备出富含超氧化物歧化酶（SOD）、单糖、氨基酸、多肽等营养成分,且易于消化吸收的绿豆营养口服液。     

基于康养文化下的张家口适老化空间设计研究

随着老龄化社会的加速到来,中国社会面临着前所未有的压力,面临着经济潜在增长率下降、劳动力成本上升、社会抚养比和养老负担加重等一系列问题,针对这些问题,国家如何进行宏观调控,地处三四线城市的张家口如何策应京津冀协同发展的步调是迫在眉睫需要解决的问题。     

The multi-step process optimisation of candied kidney beans with high nutrients and γ-aminobutyric acid retention

The candied kidney bean contains a vital bioactive compound called γ-aminobutyric acid (GABA), which could be easily lost in the traditional producing processes like soaking, cooking and candying. The traditional procedure distinctly decreased the GABA content to the GABA retention rate of 34.01% in the candied kidney bean. In this study, the optimum technological methods of soaking, cooking and candying were determined by single factor experiment according to the GABA content. The optimised producing condition was that the kidney bean was soaked at 55°C for 5 h, followed by atmospheric steaming for 35 min and then subjected to microwaving candying at 150 W for 25 min. By the optimal procedure, the GABA content retention reached 75.33%. Meanwhile, the texture, nutrient contents and antioxidant capacity were obviously improved in the candied kidney beans produced by the optimal methods.