减肥不当有害健康

为追求健美体型,越来越多的人开始投身减肥塑身运动.但许多人也许并不清楚,减肥不当,反而有害健康.     

减肥不当 有害健康

为追求健美体型，越来越多的人开始投身减肥塑身运动。但许多人也许并不清楚，减肥不当，反而有害健康。     

果蔬食用不当亦有害

人们通常认为,食用蔬菜、水果、植物调料和豆类对身体肯定有益,这个观点是错误的.许多果蔬是有害的,甚至是危险的,如果处理不当,还会引起疾病.现在就来教你如何正确食用某些果蔬.     

食海鲜不当对身体有害

海鲜食品因其肉鲜味美、营养丰富,倍受人们的青睐。但海鲜食品食之不当,也可给健康带来不良影响。     

饮茶不当也会醉

饮茶是重要的养生之道,但饮茶也必须适量。否则,不仅无益于身体健康,还会导致醉茶的发生。有一位中年男子,于当天l3时开始空腹饮用功夫茶,一直喝到17时在行。晚上临睡前,他突然发现自己的于有些颤抖,还有心慌、头疼、呼吸急促、闷气的感觉。他以为自己是得了心脏痫,便让家人把他送往医院。     

水果食用不当也可致病

一般人认为,水果总是味美清香,营养丰富,多多益善,但食用不当,也会对人体健康带来一定的危害。 西瓜 从中医的角度来看,西瓜性寒凉,一些体虚胃寒、消化不良的人吃西瓜要适可而止,切勿贪图一时痛快,吃得太多反会引起腹痛或腹泻。     

减肥不当也能减出脂肪肝

王玫得了脂肪肝了!在单位组织的例行体检中，这一结果不仅让王玫本人难以置信，也令单位同事惊讶不已。都说脂肪肝是胖人的“专利”，可王玫是出名的瘦美人，为了保持骨感身材，她一直在减肥。每天，王玫除了午餐时吃一点米饭，其余两餐一律取消主食，只吃些水果或蔬菜沙拉。同事问她饿不，她总是笑着摇头。王玫也担心这样下去时间长了会导致营养不良，所以她的包包里总装着维生素片、钙片，没事的时候吃上一两粒。可是王玫没想到，这么坚持减肥的她竟成了一个脂肪肝患者，真让她百思不得其解。     

健康食物不慎吃也有害

食物没有好坏之分,都是人们餐桌的一个组成部分,什么都吃一点,什么都不要多吃,均衡饮食才是确保身体健康的利器,这是营养学家的说法。但从个体而言,食物还是有好坏之分的,虽然这种好坏只是相比较的结果,却也造成了人们对某些食物的偏嗜。然而,若处理不当,这些由人们精选的好食物反而会变成损害健康的毒药,这种事情并不少见。     

Effect of supplementation with Cu and Zn on antioxidant enzyme activity in the rat tissues

The activities of antioxidant enzymes—copper, zinc- and manganese-superoxide dismutase (CuZnSOD and MnSOD), catalase (CAT), glutathione peroxidase (GSH-Px), glutathione S-transferase (GST) and glutathione reductase (GR)—were examined in the liver, heart, small intestine and brain, after supplementation with chelated forms of Cu and Zn. In the supplemented animals increased activity of CuZnSOD were found in the liver and heart. Activity of MnSOD and GSH-Px in the heart and GSH-Px in small intestine was decreased. After 43 days of Cu and Zn supplementation no changes in enzymes activity in the rats brain were found. The increased CuZnSOD activity in liver and heart after supplementation may be due to increased levels of the accumulation of excess Cu and Zn in these tissues. Decreased activity of other antioxidant enzymes could be the consequence of establishing a new antioxidant homeostasis, as Zn and Cu may act as antioxidants.     

家装消费误区与理念更新

随着全球性森林资源的日趋减少,森林可为人类提供木质装饰装修材料的数量、材质和品种已发生重大变化,为保护环境,合理、高效地利用木材资源,保护消费者身心健康,人们的消费理念和审美观点也要随之改变,同时也需要各方面加以正确引导。     

Zn protoporphyrin IX is formed not from heme but from protoporphyrin IX

We examined the effects of exogenous myoglobin, a bivalent chelator, and nitrite on Zn protoporphyrin IX (ZPP) formation by using model systems. ZPP was formed in a model solution without addition of exogenous myoglobin. After incubation, the amount of ZPP in a model solution was increased but that of heme was not decreased compared with the amounts before incubation. Protoporphyrin IX (PPIX) instead of ZPP also accumulated in a model solution with addition of EDTA, but the amount of heme was not reduced. These results suggested that ZPP was not formed by the Fe–Zn substitution in heme but was formed by the insertion of Zn into PPIX, which was formed independently. The fact that the effects of various factors in model systems with/without addition of a bivalent chelator were similar suggested that ZPP formation was strongly affected by PPIX formation. Inhibition of PPIX formation by nitrite might be the reason for the low levels of ZPP in cured meats.     

Zn protoporphyrin IX is formed not from heme but from protoporphyrin IX

We examined the effects of exogenous myoglobin, a bivalent chelator, and nitrite on Zn protoporphyrin IX (ZPP) formation by using model systems. ZPP was formed in a model solution without addition of exogenous myoglobin. After incubation, the amount of ZPP in a model solution was increased but that of heme was not decreased compared with the amounts before incubation. Protoporphyrin IX (PPIX) instead of ZPP also accumulated in a model solution with addition of EDTA, but the amount of heme was not reduced. These results suggested that ZPP was not formed by the Fe–Zn substitution in heme but was formed by the insertion of Zn into PPIX, which was formed independently. The fact that the effects of various factors in model systems with/without addition of a bivalent chelator were similar suggested that ZPP formation was strongly affected by PPIX formation. Inhibition of PPIX formation by nitrite might be the reason for the low levels of ZPP in cured meats.     

机械通风冷冻杀虫

物理防治法是粮食害虫综合防治的一个重要组成部分，它是指利用自然和人为的高温和低温性能，破坏害虫的生理机能和虫体结构，使害虫致死。而低温冷冻杀虫是物理防治法中的一个重要方面。     

新型选择性减害滤棒的研制

为了利用天然植物活性成分的抗氧化性,对抗氧化剂葡萄多酚(PT)、苹果多酚(PG)、茶多酚(CY)进行了筛选,采取直接添加、依托载体添加及制备成颗粒复合添加等多种添加工艺,并通过对抗氧化剂改性提高其在卷烟中的添加量,制备了新型选择性减害滤棒并卷制成样品烟支,对滤棒的各项常规物理指标和卷烟烟气的常规化学指标及自由基含量的变化进行测试。同时,采用加速氧化法对该种减害滤棒的抗氧化性能的稳定性进行了检测和评价。结果表明:采用直接添加和复合添加相结合的加工工艺,当有效成分含量为90%的改性抗氧化剂CY1在滤棒中的添加量达到3.0mg/支后,能够实现选择性显著降低烟气自由基近30%,同时不影响烟支外观和烟气常规技术指标,卷烟吸味也未因此有明显改变。     

食品中有害物质分析样品的制备

食品种类繁多, 涵盖范围广泛, 样品预处理就成为实验室检测步骤中关键的一步。本文简述了食品样品预处理过程中保障结果准确性和重现性的几个重要方面, 以最大残留限量为例, 比较了我国和其他国家及组织规定的分析部位, 讨论了一些需要注意的问题。以Gy采样模型中易测可控的样品颗粒大小为重要参数研究了其对样品缩分及均匀度的影响, 和冷冻捣碎机的优点及以后可能的应用, 最后简要地强调了样品存储的重要性。     

猪肉中有害微生物的研究进展

近年来,猪肉品质和安全性问题已经成为人们的关注热点之一.本文主要探讨了猪肉中的有害微生物这一影响猪肉品质和安全性的生物学因素,同时全面研究了猪肉中的病原菌和腐败菌等有害微生物的来源、种类、特性等,为今后能进一步研发出有效监测猪肉品质、保障肉品安全性的新型模型和检测方法提供了重要的借鉴与参考.     

食品有毒有害物质分析研究

食品中有毒有害物质是存在于食品或食品原料中对人体有毒的或者具有潜在危害性的物质。食品中有毒有害物质严重危害食品安全,可引起人体代谢紊乱,进而导致疾病的产生。近年来由食品中有毒有害物质导致的食物中毒事件层出不穷,引起各国政府、国际组织、学术机构和消费者的高度重视。本文对食品中有毒有害物质的种类、危害及污染现状及检测方法进行了综述,并对食品中有毒有害物质的未来工作进行展望。尽管我国食品中有毒有害物质仍然影响我国食品安全,但是随着我国检测水平、加工技术及监管力度的迅速提升,食品中有毒有害物质将得到有效控制,极大地提高我国食品安全水平。