小麦面筋蛋白琥珀酰化改性研究

 采用琥珀酸酐对小麦面筋蛋白进行酰化改性的研究表明 ,小麦面筋蛋白琥珀酰化的最佳反应条件为 :面筋蛋白浓度为 10 % ,反应温度为 4 0℃ ,琥珀酸酐用量为小麦面筋蛋白用量的 15 % ;琥珀酰化改性后的面筋蛋白 ,溶解度、乳化能力和起泡能力得到了提高 ,琥珀酰化小麦面筋蛋白对弱筋粉粉质特性的改善效果强于普通谷朊粉。     

油脂琥珀花生

琥珀花生系用花生米、蔗糖、大油制成的,是南味食品之一。它同琥珀桃仁一样具有琥珀的色泽,保持其花生米的自然形态美,食之香甜可口。     

黑琥珀李早结丰产栽培技术

黑琥珀李原产美国，由黑宝石×玫瑰皇后杂交选育而成，20世纪90年代引进我国试栽获得成功。近年来，黑琥珀李在古田县种植面积较大，但由于许多果农不了解黑琥珀李的特性，栽培管理不当，造成产量低、经济效益不高，挫伤了果农积极性。为此，笔者根据古田县黑琥珀李生产中存在的主要问题，结合生产实践，将黑琥珀李的特性和早结丰产栽培技术总结如下。[第一段]     

人造琥珀 凝聚财富

琥珀本是一种化石,由远古的松柏树脂及其他植物分泌物埋入地下经千万年化合而成.琥珀性脆,颜色为淡黄、褐色或红褐色,可用来做各种名贵装饰品.由于天然琥珀的资源稀缺,开采、加工困难,因而价格昂贵.     

动物药学专业英语课程教学现状及改革措施

动物药学专业英语是高等学校动物药学专业在公共基础英语的基础上开设的一门专业英语课程。开设动物药学专业英语课程是巩固公共英语教学成果、扩充动物药学专业学生知识的重要途径,也是高校培养动物药学专业人才的重要途径。本文针对目前动物药学专业英语教学现状,分析了存在的问题,并提出了相关教学改革措施,以期为动物药学专业英语课程教学提供借鉴。     

琥珀酰化修饰对甘油醛-3-磷酸脱氢酶活性的影响

通过定点突变和生物学分析,研究了赖氨酸琥珀酰化对GAPDH活性的影响。结果表明：发菜GAPDH基因全长为1 014 bp,由338个氨基酸组成,其中K264位点在藻类中高度保守。将K264位点的氨基酸K(AAA)突变为R(AGA),野生型和突变型GAPDH在大肠杆菌中表达,获得一个36.61 ku的外源蛋白。纯化后蛋白活性测定发现,发生琥珀酰化修饰比未发生琥珀酰化修饰的GAPDH(K264)活性显著降低,表明琥珀酰化修饰参与发菜GAPDH活性的调节。研究结果为深入研究发菜GAPDH的分子信息和生物学功能提供理论参考。     

制作人造琥珀变"害"为"利"致富

用琥珀做成的各种饰品,是人类最古老的饰品之一,其中又以琥珀内包含有昆虫者为珍稀名贵品种。随着现代科学技术的进步和发展,我们已经可以采用人造树脂来制作各种人造琥珀,并且可以人为地在其内放置各种昆虫和树叶等物品。而许多种类的昆虫都是害虫,比如各种蝴蝶、天牛、金龟子     

为农民工维权 义不容辞

2008年腊月二十五，河南省劳动保障监察总队接到郑州天伦琥珀名城建筑工地农民工投诉：天伦琥珀名城工地拖欠农民工工资近一年。     

浅谈临床药学工作现状和发展方向

随着医药体制改革的不断深化,对医院药学工作提出了严峻的挑战,不能开展临床药学、不能为患者在提高生活质量上有所贡献并发挥特长的医院药学,将不可能被未来的社会和医疗机构所接受,从某种意义上说,发展临床药学就是未来医院药学的生存基点和工作方向,也是医院综合发展的关键[1]。笔者对临床药学工作的现状进行了回顾,结合目前医药体制改革的实际,探讨了未来医院药学工作的发展方向。1临床药学是医药联系的纽带人类对药物认识不足,药源性疾病不断增加,导致无计其数的药物损害的发生,促使临床药学迅速崛起。纵观医药发展的历史,证明医与药偏…     

人造琥珀工艺品的制作

人造琥珀工艺品简单易做,原料易得,可做成各式各样的字画、人像、花鸟鱼虫等装饰品和旅游纪念品.它晶莹透亮,造型生动活泼,甚至比天然琥珀还略胜一筹.     

Carbon functionalities in amber

High-resolution nuclear magnetic resonance spectra of the carbon nuclei in powdered amber, obtained by using the techniques of magic angle spinning and cross polarization, provide detailed information about the types of carbon functionalities. The entire spectrum of Baltic amber (succinite) is identical for several samples. Baltic amber shows minor differences from Sicilian amber and drastic differences from Burmese, Romanian, and Bohemian ambers.     

Amber with Insect and Plant Inclusions from the Dominican Republic

An amber-bearing formation observed in the Dominican Republic in 1959 is described, and several insect orders, spiders, and plants found in amber are noted. An amber trace is recorded for Haiti, and the known fossil-bearing amber deposits or sites in the New World are summarized.     

An upper eocene frog from the dominican republic and its implication for Caribbean biogeography

A frog of the leptodactylid genus Eleutherodactylus is reported from Eocene amber found in the Dominican Republic. It is the first described amphibian fossil in amber, and the oldest complete lissamphibian fossil from Mesoamerica (Central America and Mexico). Dating of the amber matrix indicates that by the end of the Eocene a diverse fauna was present in the Antilles, much earlier than has generally been proposed. The presence of this and other amber fossils from this same age suggests that Tertiary patterns of landmass movements were significant in determining the present distribution of species.     

A diverse assemblage of Late Cretaceous dinosaur and bird feathers from Canadian amber

The fossil record of early feathers has relied on carbonized compressions that lack fine structural detail. Specimens in amber are preserved in greater detail, but they are rare. Late Cretaceous coal-rich strata from western Canada provide the richest and most diverse Mesozoic feather assemblage yet reported from amber. The fossils include primitive structures closely matching the protofeathers of nonavian dinosaurs, offering new insights into their structure and function. Additional derived morphologies confirm that plumage specialized for flight and underwater diving had evolved in Late Cretaceous birds. Because amber preserves feather structure and pigmentation in unmatched detail, these fossils provide novel insights regarding feather evolution.     

核桃仁加工品(琥珀核桃仁、椒盐核桃仁)抗氧化活性的研究

本文对琥珀核桃仁、椒盐核桃仁以及未加工核桃仁的总酚含量、过氧化值和酸价进行了分析测定,用DPPH法和TBA法对以上3种核桃仁的95%乙醇提取物的抗氧化活性进行了分析比较。结果表明:与未加工的核桃仁相比,琥珀核桃仁和椒盐核桃仁的过氧化值和酸价略有升高;总酚含量分别下降了40%和26%;其95%乙醇提取物对DPPH自由基的清除能力也相应减少了44%和27%;用TBA法分析表明,在亚油酸脂质氧化第6d开始,琥珀核桃仁与椒盐核桃仁95%乙醇的提取物抑制脂质过氧化的作用明显减弱,而未加工核桃仁95%乙醇提取物的抑制作用持续稳定,与0.02%TBHQ相当。     

Ultrastructure of 40-million-year-old insect tissue

Examination of the ultrastructure of preserved tissue in the abdomen of a fossil fly (Mycetophilidae: Diptera) entombed in Baltic amber revealed recognizable cell organelles. Structures that corresponded to muscle fibers, nuclei, ribosomes, lipid droplets, endoplasmic reticulum, and mitochondria were identified with the transmission electron microscope. Preservation was attributed to inert dehydration as well as the presence of compounds in the original sap which functioned as natural fixatives. This evidence of cell organelles in fossilized soft tissues represent an extreme form of mummification since Baltic amber is considered to have formed about 40 million years ago.     

东南亚国家在农产品国际贸易中的黄箱政策——以越南,印尼,马来西亚,菲律宾为例

东南亚国家在经济发展状况,农产品贸易等方面具有很大的相似性.黄箱政策作为许多国家目前使用的国内支持政策,在国际贸易中扮演着十分重要的角色,因此,在世界各国要求削减黄箱政策的呼声日益高涨的情况下,剖析东南亚国家的黄箱政策是十分必要的.本文主要以越南,印尼,马来西亚,菲律宾为例,通过分析比较得出结论.     

Carnivorous fungi from Cretaceous amber

Carnivorous fungi dating back to the age of the dinosaurs have been found fossilized in circa-100-million-year-old amber. The fossil fungi used hyphal rings as trapping devices and are preserved together with their prey, small nematodes. The excellent preservation in amber allowed comparison with extant groups: On the basis of the mode of ring formation and the dimorphic mode of life, the fossils cannot be assigned to any recent carnivorous fungus, providing evidence that different groups occupied this ecological niche in the Cretaceous and that trapping devices were developed independently multiple times in the course of Earth history.     

Invasion and extinction in the west Indian ant fauna: evidence from the dominican amber

Of 37 genera and well-defined subgenera identified in the amber of the Dominican Republic (late Oligocene or early Miocene), 34 have survived somewhere in the New World tropics to the present, although the species studied thus far are extinct. Of the surviving genera and subgenera, 22 persist on Hispaniola. Fifteen genera and subgenera have colonized the island since amber times, restoring the number of genera and well-defined subgenera now present on Hispaniola to 37. A higher extinction rate has occurred in genera and subgenera that are either highly specialized or possess less colonizing ability, as evidenced by their restriction to the New World.     

Gas bubbles in fossil amber as possible indicators of the major gas composition of ancient air

Gases trapped in Miocene to Upper Cretaceous amber were released by gently crushing the amber under vacuum and were analyzed by quadrupole mass spectrometry. After discounting the possibility that the major gases N(2), O(2), and CO(2) underwent appreciable diffusion and diagenetic exchange with their surroundings or reaction with the amber, it has been concluded that in primary bubbles (gas released during initial breakage) these gases represent mainly original ancient air modified by the aerobic respiration of microorganisms. Values of N(2)/(CO(2) + O(2)) for each time period give consistent results despite varying O(2)/CO(2) ratios that presumably were due to varying degrees of respiration. This allows calculation of original oxygen concentrations, which, on the basis of these preliminary results, appear to have changed from greater than 30 percent O(2) during one part of the Late Cretaceous (between 75 and 95 million years ago) to 21 percent during the Eocene-Oligocene and for present-day samples, with possibly lower values during the Oligocene-Early Miocene. Variable O(2) levels over time in general confirm theoretical isotope-mass balance calculations and suggest that the atmosphere has evolved over Phanerozoic time.