提取牡蛎 raising oysters.doc
提取牡蛎Raising Oysters
In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean shells about. Nex t, they “planted” fertilized oyster eggs, which within two or three weeks hatched into larvae. The larvae drifted until they attached themselves to the clean shells on the bottom. There they remained and in time grew into baby oysters called seed or spat. The spat grew larger by drawing in seawater from which they derived microscopic particles of food. Before long, farmers gathered the baby oysters, transplanted them once more into another body of water to fatten them up.Until recently the supply of wild oysters and those crudely farmed were more than enough to satisfy people＇s needs. But today the delectable seafood is no longer available in abundance. The problem has become so serious that some oyster beds have vanished entirely.Fortunately, as far back as the early 1900＇s marine biologists realized that if new measures were not taken, oysters would become extinct or at best a luxury food. So they set up well-equipped hatcheries and went to work. But they did not have the proper equipment or the skill to handle the eggs. They did not know when, what, and how to feed the larvae. And they knew little about the predators that attack and eat baby oysters by the millions. They failed, but they doggedly kept at it. Finally, in the 1940＇s a significant breakthrough was made.The marine biologists discovered that by raising the temperature of the water, they could induce oysters to spawn not only in the summer but also in the fall, winter, and spring. Later they developed a technique for feeding the larvae and rearing them to spat. Going still further, they succeeded in breeding new strains that were resistant to diseases, grew faster and larger, and flourished in water of different salinities and temperatures. In addition, the cultivated oysters tasted better!。
牡蛎的生物活性及其食品的开发研究进展
牡蛎及其牡蛎提取物的活性成分和食品应用开发进展具有“益智海鲜”牡蛎，又有“海里的牛奶”之称。
其富含大量蛋白质和人体所缺的锌，并且可防止皮肤干燥，促进皮肤新陈代谢，分解黑色素，可用作功能性食品。
源森生物牡蛎提取物本文就牡蛎的生物活性进行综述，研究其在功能性食品、保健食品、及食品中的应用进展：一、源森生物牡蛎提取物—牡蛎生物及其牡蛎提取物活性研究进展（一）牡蛎提取物的降血糖功能滕瑜等人用牡蛎提取物对四氧嘧啶引起的高血糖大鼠进行治疗，发现血糖下降较明显，胰岛素也有明显提高，表明牡蛎提取物对糖尿病具有一定的治疗作用。
经临床实验证实，它能够较好地改善临床症状。
徐静研究了牡蛎提取物降低小鼠血糖的作用，结果表明：牡蛎提取物具有阻抑四氧嘧啶诱导的小鼠血糖和丙二醛(MDA)水平升高、胰岛素和SOD含量降低以及肿瘤坏死因子(TNF)的异常表达等功能。
Tanaka等人通过小鼠实验发现, 牡蛎酶解产物,显著地抑制小鼠血糖浓度的升高,具有一定的降血糖作用。
（二）牡蛎提取物的增强免疫功能牡蛎能够增强机体免疫力。
Achour等人研究了牡蛎提取物对艾磁病毒感染者和正常人的免疫细胞的影响。
发现牡蛎提取物在激活剂白介素-2(IL-2)存在时，能促使T细胞大量增殖，有减缓艾滋病患者免疫功能下降的趋势。
张冬青等人研究证明，牡蛎提取物对小鼠的免疫功能有正向调节作用，可以阻碍由环磷酰胺所引起的免疫低下反应。
王俊等人研究发现，25mg/mL牡蛎多糖能有效地增加正常小鼠的脾淋巴细胞转化率、对小鼠DNT、NK细胞活性、PFC、小鼠腹腔巨噬细胞吞噬鸡红细胞能力、荷瘤小鼠脾细胞活性起正向调节。
表明牡蛎多糖能增强小鼠细胞免疫、体液免疫功能。
（三）牡蛎提取物的降血压作用血管紧张素转化酶(angiotensin-I-conver-tingenzyme,ACE)在血压调节方面起着重要作用，当其受到抑制时血压就会降低。
于娅等人采用酶解方法制备了对ACE有较好抑制作用的牡蛎功能短肽，0.4 mg/mL的牡蛎功能短肽对ACE抑制率为51.4%。
牡蛎提取物中重金属的检测实验(起草三)
降低牡蛎提取物中重金属的含量实验会对人体产生毒性, 严重危害健康。
对于某些人体所必需的微量元素如铜和锌等,当它们的浓度或体内积蓄量达到必然阈值时,也会对人体产生迫害作用实验内容：牡蛎提取物中重金属的含量检测重金属含量测定实验方案：本实验在测定牡蛎提取物中重金属含量的实验中，各个重金属离子将同时别离测定在牡蛎粉和牡蛎提取物中的含量，每组实验都在两批样品中取样，测定结束后对比测定结果，对实验结果进行分析，并为后续进行的重金属离子的减排实验做好准备工作。
一、实验方式：本实验重金属含量的测定采用原子吸收分光光度法，用石墨炉原子吸收测定铅镉，火焰原子吸收法测定铜，氢化物法测定砷，冷蒸气吸收法测定汞。
二、实验原理：（1）石墨炉原子吸收分光光度法原理样品经灰化或酸消解后，注入原子吸收分光光度计石墨炉中，电热原子化后吸收适宜波长共振线，在必然浓度范围，其吸收值与铅含量成正比，与标准系列比较定量。
（2）火焰原子吸收分光光度法原理样品经处置后，铅离子在必然PH条件下与DDTC(二乙基二硫代氨基甲酸盐)形成络合物，经4-甲戊酮-2萃取分离，导和原子吸收光谱仪中，火焰原子化后，吸收适宜波长共振线，其吸收量与铅含量成正比，与标准系列比较定量。
三、实验步骤砷的测定测定条件采用适宜的氢化物发生装置，以含%硼氢化钠和%氢氧化钠溶液（临用前配置）作为还原剂，盐酸溶液为载液，氮气为载气，检测波长为.测定法精密吸取空白溶液与供试品溶液各10ml，照标准曲线的制备项下依法测定。
从标准曲线上读出供试品溶液中砷的含量，计算，即得。
汞的测定测定条件采用适宜的氢化物发生装置，以含1%硼氢化钠和%氢氧化钠溶液（临用前配置）作为还原剂，盐酸溶液为载液，氮气为载气，检测波长为. 测定法精密吸取空白溶液与供试品溶液适量，照标准曲线的制备项下依法测定。
从标准曲线上读出供试品溶液中汞的含量，计算，即得。
铜的测定测定条件检测波长为，采用空气-乙炔火焰，必要时进行背景校正。
牡蛎盐溶法提取含硒蛋白质的工艺优化
2020年第21期广东化工第47卷总第431期 · 15 · 牡蛎盐溶法提取含硒蛋白质的工艺优化杨雪园，梁兴唐，尹艳镇，李根，郑韵英，钟书明，张瑞瑞*，李启瑶(北部湾大学石油与化工学院，广西钦州535006)[摘要]为了提高牡蛎产业的附加值，本研究以牡蛎为原料，采用盐溶法提取牡蛎中含硒的蛋白质。
以含硒蛋白质提取比为考察指标，运用单因素实验和正交试验分别对提取时间、提取温度和提取液浓度3个因素进行考察，最终确定最佳的提取工艺条件。
结果表明：盐溶提取法中最佳提取温度为35 ℃，提取时间为10.00 h，NaCl的浓度为0.6000 mol/L。
在提取的蛋白质中，含硒蛋白质的提取率最大可以达到34.53 %。
[关键词]盐溶法；硒；蛋白质；提取率[中图分类号]TS254.4 [文献标识码]A [文章编号]1007-1865(2020)21-0015-03 Optimization of Extraction Process of Selenium Containing Protein from Oyster Yang Xueyuan, Liang Xingtang, Yin Yanzhen, Li Gen, Zheng Yunying, Zhong Shuming, Zhang Ruirui*, Li Qiyao(College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 535006, China) Abstract: In order to improve the added value of oyster industry, the protein containing selenium was extracted from oyster by salt dissolving method. Taking the extraction ratio of selenium containing protein as the index, single factor experiment and orthogonal test were used to investigate the three factors of extraction time, extraction temperature and extract concentration, and the optimal extraction conditions were determined. The results showed that the optimum extraction temperature was 35 ℃, the extraction time was 10.00 h, and the concentration of NaCl was 0.6000 mol/L. Among the extracted proteins, the extraction rate of selenium containing protein is the highest, which can reach 34.53 %.Keywords: salt dissolving method；selenium,；protein；extraction rate牡蛎(Oyster)，可以叫生蚝、也可以叫蛎黄等，是温水性的生鲜、外硬内软，为地球上最肥的养殖双壳贝类。
湛江生蚝英语作文
湛江生蚝英语作文Zhanjiang OystersZhanjiang, a coastal city in the southern province of Guangdong, China, is renowned for its bountiful supply of fresh and succulent oysters. These delectable mollusks have been a staple of the local cuisine for generations, and their reputation has spread far beyond the city's borders, attracting visitors from near and far to savor their unique flavor.The secret to Zhanjiang's exceptional oysters lies in the city's geographical location and the pristine waters that surround it. Situated on the edge of the South China Sea, Zhanjiang is blessed with a diverse marine ecosystem that provides the perfect conditions for oyster cultivation. The nutrient-rich waters, combined with the gentle currents and moderate temperatures, create an ideal environment for these bivalves to thrive.The harvesting of Zhanjiang's oysters is a time-honored tradition that has been passed down through the generations. Local fishermen and farmers have honed their skills over the years, developing specialized techniques to ensure the highest quality andsustainability of the oyster beds. From the careful selection of the best growing sites to the meticulous monitoring of water quality and the delicate handling of the oysters during harvesting, every step in the process is carried out with the utmost care and attention to detail.One of the most distinctive features of Zhanjiang's oysters is their unique flavor profile. Unlike the briny and sometimes overpowering taste of oysters from other regions, Zhanjiang's oysters possess a delicate balance of sweetness and umami, with a subtle hint of brininess that lingers on the palate. This distinctive flavor is a resultof the oysters' diet, which is primarily composed of the nutrient-rich plankton and algae that thrive in the local waters.In addition to their exceptional taste, Zhanjiang's oysters are also highly prized for their nutritional value. These bivalves are rich in a variety of essential vitamins and minerals, including vitamin A, vitamin B12, iron, and zinc. They are also a valuable source of protein, making them a popular choice among health-conscious consumers.The popularity of Zhanjiang's oysters has led to the development of a thriving local industry, with numerous farms and processing facilities dedicated to the cultivation and distribution of these coveted mollusks. The city's oyster festival, held annually, has become a much-anticipated event, drawing thousands of visitorsfrom around the world to celebrate the region's culinary heritage and sample the finest of Zhanjiang's oyster offerings.Beyond their gastronomic appeal, Zhanjiang's oysters also play a vital role in the local ecosystem. These bivalves are natural water filters, capable of removing excess nutrients and pollutants from the water, thereby helping to maintain the delicate balance of the marine environment. This ecological function has made oyster farming an increasingly important aspect of the city's sustainable development efforts, as it helps to preserve the natural beauty and biodiversity of the region.In conclusion, Zhanjiang's oysters are a true culinary treasure, a testament to the region's rich natural resources and the hard work and dedication of its people. Whether savored raw, grilled, or prepared in a variety of traditional and innovative dishes, these delectable mollusks have the power to captivate the senses and leave a lasting impression on all who have the privilege of experiencing them. As Zhanjiang's oyster industry continues to grow and evolve, it is clear that these remarkable bivalves will remain a beloved and integral part of the city's cultural and gastronomic identity for generations to come.。
牡蛎与生蚝的英语作文
牡蛎与生蚝的英语作文题目，A Comparison Between Oysters and Live Oysters。
Oysters and live oysters, although they may sound similar, they have distinct characteristics and play different roles in culinary and ecological contexts. In this essay, we will delve into the nuances of these two shellfish, exploring their differences, similarities, and significance.Introduction。
Oysters and live oysters are both members of the bivalve mollusk family, characterized by their hinged shells and filter-feeding mechanism. However, the distinction lies in their state of freshness and preparation.Physical Characteristics。
Oysters, whether fresh or cooked, have a distinct appearance. Their shells are typically rough and irregular in shape, ranging in color from pale grey to dark brown. Inside, the oyster's flesh is plump and succulent, varying in color from creamy white to light grey, depending on the species and habitat.On the other hand, live oysters possess a vibrant and lively appearance. Their shells are tightly closed, ensuring the retention of seawater within. When opened, live oysters reveal a translucent, glistening flesh, indicating their freshness and readiness for consumption.Culinary Uses。
生牡蛎存在感染的风险Rawoysterscanbeariskforinfections
1.生牡蛎存在感染的风险= Raw oysters can be a risk for infections ［关键词］弧菌；牡蛎；公共卫生；副溶血性弧菌；鲨鱼弧菌位于巴西塞阿拉Euzebio的海洋科学学会沿海水产养殖研究中心（CSCA）连续12个月每月采集10-18个牡蛎。
对约150个牡蛎及其内瓣膜液进行了分析。
牡蛎肉及内瓣膜液经弧菌标准平板计数（SPC）从25至5900万CFU/g不等。
大多数牡蛎在这个12个月中，一直有副溶血性弧菌；其中四个时期发现过鲨鱼弧菌。
在其他分离的种中，还确定了一株威胁人类健康的创伤弧菌。
鉴于许多弧菌属的致病菌存在于贝类的整个生长周期中，因此绝不能生食牡蛎。
（/pubmed/20428657，2010）2.副溶血性弧菌不同的毒力因子在细胞毒性、肠毒性以及对小鼠致死率的作用=Contribution of Vibrio parahaemolyticus Virulence Factors toCytotoxicity, Enterotoxicity, and Lethality in Mice［关键词］副溶血性弧菌；T3SS；TDH研究证明T3SS1对所有细胞具有细胞毒性，而T3SS2和TDH对有限数量的细胞株产生细胞毒性作用。
T3SS2是副溶血性弧菌产生肠毒素活性的主要原因。
还发现，T3SS1和TDH在小鼠感染模型的致死活性中都起着显著作用。
证据表明，这些致病因子在副溶血性弧菌的致病性起着不同的作用。
(/cgi/content/short/78/4/1772，2010)3.副溶血性弧菌的两个调节蛋白通过控制Vp-PAI区的基因表达在肠毒素活性中起重要作用=Two Regulators of Vibrio parahaemolyticus PlayImportant Roles in Enterotoxicity by Controlling the Expression of Genes in the Vp-PAI Region［关键词］副溶血性弧菌；T3SS；TDH；毒力岛Vp-PAI研究了两个新的类似ToxR的转录调节蛋白（VtrA和VtrB）以调节编码Vp-PAI区域的基因表达，其中包括TDH及T3SS2相关蛋白质的表达。