期刊文献+
共找到11篇文章
< 1 >
每页显示 20 50 100
真假食醋现场快速鉴别试剂盒的研制 被引量:1
1
作者 方邢有 路东琪 +2 位作者 严守雷 邵秋荣 丁晓 《中国调味品》 CAS 北大核心 2012年第5期75-76,共2页
建立针对特征物质(乙醇)的特异显色反应,鉴别真假食醋。先用活性炭对食醋有效脱色后,根据乙醇在高锰酸钾氧化下与品红反应生成深紫色化合物来进行鉴别,该方法简单快速、准确可靠,易于应用于现场进行检测。
关键词 酿造醋(真醋) 合成醋(假食醋) 乙醇 试剂盒
下载PDF
On the intraspecific variability in basal metabolism and the food habits hypothesis in birds 被引量:1
2
作者 F. BOZINOVIC P. SABAT 《Current Zoology》 SCIE CAS CSCD 北大核心 2010年第6期759-766,共8页
The food habits hypothesis (FHH) stands as one of the most striking and often-cited interspecific patterns to emerge from comparative studies of endothermic energetics. The FHH identifies three components of diet th... The food habits hypothesis (FHH) stands as one of the most striking and often-cited interspecific patterns to emerge from comparative studies of endothermic energetics. The FHH identifies three components of diet that potentially produce variability in mass-independent BMR, i.e. food quality, food availability, and food predictability or environmental productivity. The hypothesis predicts that species with diets of low energy content and/or low digestibility should evolve low mass-independent BMRs. The effects of food habits on BMR have been widely investigated at the interspecific level, but the variation between individuals and populations has been largely ignored. Our focus is to compare predictions derived from interspecific studies with data collected from within-species studies to explore the mechanisms and functional significance of adaptive responses predicted by the food-habits hypothesis among birds. We conclude that if BMR is correlated with daily energy expenditure, then organisms that can lower BMR will reduce daily energy expenditure and hence, food requirements. Birds that lower BMR in stressful environments may increase survival. Nevertheless, the mechanism (s) by which birds eating a low quality diet reduce BMR and whether lower BMR affects fitness remain to be determined [Current Zoology 56 (6): 759-766, 2010]. 展开更多
关键词 Intraspecific comparisons Avian energetics Food habits hypothesis DIET Basal metabolic rate
下载PDF
Reuse of waste frying oil for production of rhamnolipids using Pseudomonas aeruginosa zju.u1M 被引量:12
3
作者 ZHU Yong GAN Jun-jiang +3 位作者 ZHANG Guo-liang YAO Bin ZHU Wen-jie MENG Qin 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第9期1514-1520,共7页
In this work,rhamnolipid production was investigated using waste frying oil as the sole carbon source. By culture in shaking flasks,a naturally isolated strain synthesized rhamnolipid at concentration of 12.47 g/L and... In this work,rhamnolipid production was investigated using waste frying oil as the sole carbon source. By culture in shaking flasks,a naturally isolated strain synthesized rhamnolipid at concentration of 12.47 g/L and its mutant after treatment by UV light increased this productivity to 24.61 g/L. Fermentation was also conducted in a 50 L bioreactor and the productivity reached over 20 g/L. Hence,with a stable and high productive mutant strain,it could be feasible to reuse waste frying oil for rhamnolipid production on industrial scale. 展开更多
关键词 RHAMNOLIPID Pseudomonas aeruginosa BIOSURFACTANT Waste frying oil
下载PDF
食品安全 敢为人先——长沙市建设食品安全城市纪实 被引量:1
4
作者 章庭杰 《创作》 2009年第5期117-123,共7页
保障食品安全,是关系人民群众切身利益、关系我国社会主义现代化建设全局的重大任务。——胡锦涛民以食为天,食以安为先。长沙精神"心忧天下,敢为人先",也率先覆盖到了食品安全。这是长沙的一项重大决策,也是长沙的一大重要... 保障食品安全,是关系人民群众切身利益、关系我国社会主义现代化建设全局的重大任务。——胡锦涛民以食为天,食以安为先。长沙精神"心忧天下,敢为人先",也率先覆盖到了食品安全。这是长沙的一项重大决策,也是长沙的一大重要特色。陈润儿书记、张剑飞市长亲自抓,谢树林副书记具体抓。前些年,只要不存视听障碍,什么"农药残留","添加剂","色素","吊白块","潲水油","苏丹红","硫磺辣椒",假食假药,假烟假酒,可以使你望而生畏,闻之作呕。 展开更多
关键词 品安全标准 以安 人造鸡蛋 视听障碍 监管任务 农药残留 吊白块 潲水油 假食 检测机构
原文传递
古人造假与打假的那些事儿
5
作者 凯风文史 《内蒙古人大》 2016年第4期47-47,共1页
遭遇假货,总是让人不快,小则破财,大则送命。自古至今,人们对造假都深恶痛绝。今天,我们就说说古人造假与打假的那些事儿。谁是造假的祖师爷?根据韩非子的记载,赵武灵王和秦昭王可以算是造假的祖师爷了。赵武灵王曾让人搭架子在石头上... 遭遇假货,总是让人不快,小则破财,大则送命。自古至今,人们对造假都深恶痛绝。今天,我们就说说古人造假与打假的那些事儿。谁是造假的祖师爷?根据韩非子的记载,赵武灵王和秦昭王可以算是造假的祖师爷了。赵武灵王曾让人搭架子在石头上刻上巨大的脚印,然后在旁边注释说:赵雍到此一游。后人若糊涂,往往就会被骗了——"原来赵武灵王是个巨人啊!"《韩非子·外储说左上》记载道:" 展开更多
关键词 外储 赵雍 说左 城市化速度 过失杀人罪 手段 钩梯 《唐律疏议》 假食 学术打
原文传递
余音绕梁
6
作者 郑越 《文史知识》 1983年第4期115-115,共1页
形容歌声或音乐动人,给人留下深刻的印象。这个典故出在《列子·汤问》。【原文】昔韩娥东之(往)齐,匮粮,过雍门,鬻歌假食。既会,而余音绕梁领(屋栋),三日不绝,左右以其人弗去。过逆旅(客店),逆旅人辱之。韩娥因曼声(引长声调)哀哭... 形容歌声或音乐动人,给人留下深刻的印象。这个典故出在《列子·汤问》。【原文】昔韩娥东之(往)齐,匮粮,过雍门,鬻歌假食。既会,而余音绕梁领(屋栋),三日不绝,左右以其人弗去。过逆旅(客店),逆旅人辱之。韩娥因曼声(引长声调)哀哭,一里老幼悲愁,垂涕相对,三日不食。进而追之。娥还,复为曼声长歌。一里老幼喜跃忭舞(忭biàn,喜欢的样子), 展开更多
关键词 韩娥 三日不绝 雍门 假食
原文传递
谈用泡沫塑料钓鱼
7
作者 陆念祖 《中国钓鱼》 1994年第11期26-26,共1页
近些年来北京地区的钓鱼爱好者越来越多地使用泡沫塑料(颗粒状)钓鱼,大家称它为假食。本人使用假食已有几年历史,在许多鱼塘内钓过,其效果是很不错的。经过这些年的实践,逐渐总结出了一点经验体会供大家参考。
关键词 假食 颗粒状 坑塘 上钩率 杂鱼 鱼饲料 送漂 水下地形 伊势 五花
原文传递
一种Kappa-卡拉胶酶的克隆、表达及其酶学性质研究 被引量:1
8
作者 李佳佳 倪辉 +2 位作者 蔡慧农 朱艳冰 肖安风 《现代食品科技》 EI CAS 北大核心 2016年第10期72-77,共6页
将来源于Pseudoalteromonas carrageenovora ASY5菌株的κ-卡拉胶酶基因克隆到载体p ET-28a上,并转化到大肠杆菌BL21(DE3)中表达。克隆得到的κ-卡拉胶酶基因序列全长1194 bp,编码一个由398个氨基酸残基组成的蛋白酶,该蛋白酶的分子量为... 将来源于Pseudoalteromonas carrageenovora ASY5菌株的κ-卡拉胶酶基因克隆到载体p ET-28a上,并转化到大肠杆菌BL21(DE3)中表达。克隆得到的κ-卡拉胶酶基因序列全长1194 bp,编码一个由398个氨基酸残基组成的蛋白酶,该蛋白酶的分子量为48 ku,结构域分析表明该κ-卡拉酶符合GH16家族的特点。对重组κ-卡拉胶酶的酶学性质进行考察:重组κ-卡拉胶酶只能够专一性的降解κ-卡拉胶;该酶的最适温度和pH分别是55℃和pH 9.0,重组酶在40℃保温1 h可保持95.0%的活性,在45℃保温1 h残余酶活与对照比较仍保留60.0%,在pH 8.0~10.0的缓冲液中处理30 min,仍能保持80%以上的酶活力,低浓度的Na+和K+以及1mmol/L的Sn^(2+)、Fe3+、EDTA、DTT、Tween-20、Tween-80和Triton X-100、β-mercaptoethanol、SDS、Urea对重组酶活具有显著的促进作用;而高浓度的Na+和K+以及1 mmol/L的Cd^(2+)、Ba^(2+)、Mg^(2+)、Fe^(2+)、Ca^(2+)对重组酶活性有不同程度的抑制作用。 展开更多
关键词 鹿角菜交替单胞菌 κ-卡拉胶酶 克隆表达 酶学性质
原文传递
Esophageal food impaction during cultural holidays and national athletic events
9
作者 Asim Shuja Diana M.Winston +3 位作者 Asad Ur Rahman Roger D.Mitty Bertrand L.Jaber Thormika Keo 《Gastroenterology Report》 SCIE EI 2017年第1期43-46,I0002,共5页
Background:Although intrinsic risk factors contributing to esophageal food impaction are well established,whether social behavior affects its occurrence has not yet been examined.Methods:We conducted a retrospective r... Background:Although intrinsic risk factors contributing to esophageal food impaction are well established,whether social behavior affects its occurrence has not yet been examined.Methods:We conducted a retrospective review of the gastroenterology endoscopy procedural documentation software for the period of 2001–2012 to identify all patients who presented to our emergency department for esophageal foreign-body removal at the time of national athletic events and holidays associated with dietary indiscretions.Results:We found that adults undergoing emergent esophagogastroduodenoscopy during periods celebrating cultural holidays and national athletic events were more likely to experience esophageal food impaction compared with those undergoing emergent endoscopy during periods not associated with these events(36.8% vs 3.6%;P<0.001):a 10-fold increase.During a national holiday/athletic event period,the most common impacted food item was turkey(50%)followed by chicken(29%)and beef(21%).Conclusions:Esophageal food impaction is more likely to occur on American holidays and national athletic events and is associated with large meals.Patients with intrinsic risk factors should be advised to modify their diet during cultural events associated with tachyphagia and large meals to prevent esophageal food impaction. 展开更多
关键词 ESOPHAGUS foreign body food impaction HOLIDAY athletic event
原文传递
Responses of morphological and physiological traits to herbivory by snails of three invasive and native submerged plants 被引量:1
10
作者 Xiaolong Huang Jinlei Yu +4 位作者 Baohua Guan Hongmin Xie Shuailing Liu Hu He Kuanyi Li 《Journal of Plant Ecology》 SCIE CSCD 2022年第3期571-580,共10页
The submerged plant species Carolina fanwort(Cabomba caroliniana)has become a dominant invasive aquatic plant in the Lake Taihu Basin(LTB)in China.Introduced species may escape their original specialist enemies and en... The submerged plant species Carolina fanwort(Cabomba caroliniana)has become a dominant invasive aquatic plant in the Lake Taihu Basin(LTB)in China.Introduced species may escape their original specialist enemies and encounter fewer enemies in their new environment.They were assumed to have suffered less herbivory than native species as they are relatively unpalatable(the enemy release hypothesis[ERH]).The objective of this study was to compare the responses of C.caroliniana with those of co-occurring native species to herbivory from native herbivores.We conducted a mesocosm experiment to record the responses of C.caroliniana and two commonly co-occurring native submerged plant counterparts,water thyme(Hydrilla verticillata)and Eurasian watermilfoil(Myriophyllum spicatum),to herbivory by two native generalist gastropod snails,Radix swinhoei and Sinotaia quadrata.Plant morphological traits(total biomass,shoot/root[S/R]biomass ratio and relative growth rate[RGR])and physiological traits(leaf total nonstructural carbohydrate[TNC],lignin,and cellulose)were recorded.The snail S.quadrata rarely influenced the plant traits of the three submerged plants.With the increasing numbers of R.swinhoei treatments,most of the plant traits of H.verticillata and M.spicatum changed,while those of C.caroliniana showed a relatively stable fluctuation.This result indicates that C.caroliniana is more resistant to herbivory by the snail R.swinhoei,which is consistent with the ERH hypothesis.This finding indicates that herbivorous snail species contributes to the invasion of C.caroliniana,which potentially alters the species composition of submerged plants in the plant community. 展开更多
关键词 aquatic plant biological invasion Cabomba caroliniana enemy release hypothesis Lake Taihu Basin plant–herbivore interactions
原文传递
Effects of soil nitrogen levels on growth and defense of the native and introduced genotypes of alligator weed 被引量:2
11
作者 Mu Liu Fang Zhou +2 位作者 Xiaoyun Pan Zhijie Zhang Bo Li 《Journal of Plant Ecology》 SCIE CSCD 2022年第3期461-472,共12页
Plants growing in nutrient-rich environment are predicted to be less defended than conspecifics under nutrient limitation.However,less is known about the effects of nutrient levels on tolerance and induced resistance,... Plants growing in nutrient-rich environment are predicted to be less defended than conspecifics under nutrient limitation.However,less is known about the effects of nutrient levels on tolerance and induced resistance,and whether the effects differ between native and introduced populations of invasive plants.We performed a greenhouse experiment with introduced(the USA)and native(Argentina)genotypes of Alternanthera philoxeroides in order to study the effects of soil nitrogen levels on plant growth,constitutive and herbivore(Agasicles hygrophila)-induced chemical defense,and herbivory tolerance.We measured total biomass,elongation rate(as proxy of growth rate),carbon and nitrogen,and the concentration of triterpenoid saponins(defensive chemicals)in leaves and roots.Constitutive resistance(+33%higher leaf triterpenoid saponins in control treatment at low nitrogen level)and tolerance[less decreased total biomass after herbivory treatment(−24%and−15%for high and low nitrogen levels)]were favored at lower nitrogen level,while induced resistance was favored at higher nitrogen level(+24%increased leaf triterpenoid saponins after herbivory treatment at high nitrogen level).Constitutive resistance and tolerance exhibited trade-offs with growth rate,while induced resistance positively correlated with growth rate.Additionally,the introduced genotypes had−6%lower content of leaf carbon in the presence of herbivores than the native genotypes at low nitrogen level,but such difference was absent at high nitrogen level.Our results indicate that soil nitrogen levels influence the preference of different defensive strategies of plant,and interweave with herbivory to determine the performance of introduced genotypes. 展开更多
关键词 Alternanthera philoxeroides Agasicles hygrophila growth–differentiation balance hypothesis phenotypic plasticity plant–herbivore interactions plant invasion
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部