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Portable pump

Company: Bio-Rad Laboratories
Catalog#: Econo Gradient Pump
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Rapid Isolation and Purification of Secreted Bacteriocins from Streptococcus mutans and Other Lactic Acid Bacteria
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Date:
2020-11-20
[Abstract]   Bacteriocins are small ribosomally synthesized antimicrobial peptides produced by some microorganisms including lactic acid bacteria (LAB), a group of Gram-positive bacteria (cocci, rods) expressing high tolerance for low pH. Bacteriocins kill bacteria rapidly and are biologically active at very low concentrations. Bacteriocins produced by LAB are primarily active against closely related bacterial species. Many bacteriocins have been investigated with respect to their potential use in promoting human, plant, and animal health, and as food biopreservatives. Bacteriocins produced by LAB are particularly interesting since several LAB have been granted GRAS (Generally Recognized as Safe) status. Because it is not always possible to extract active bacteriocins secreted from cells grown in ... [摘要]  [摘要]细菌素是由一些核糖体合成的抗菌肽微生物,包括乳酸菌(LAB),一组革兰氏阳性菌(球菌,棒)表现出对低pH的高耐受性。细菌素可迅速杀死细菌,并在极高的温度下具有生物活性。低浓度。LAB生产的细菌素主要对紧密相关的细菌具有活性种类。已经研究了许多细菌素在促进细菌生长方面的潜在用途。对人类,植物和动物健康,以及作为食品生物防腐剂。LAB生产的细菌素是特别有趣的是,由于一些实验室已获得GRAS(通常被认为是安全的)状态。因为并非总是可能提取液体中生长的细胞分泌的活性细菌素介质,我们开发了一种使用半固体的简单而廉价的肽提取程序营养丰富的琼脂培养基。我们在此提出一种详细的程序,以快速提取出从口腔物种分泌的生物活性细菌素肽变异链球菌,多产的菌种的生产及其在其他实验室提取细菌素的潜在应用(例如,链球菌,乳球菌,肠球菌)。我们还提出了一种简单的检测方法纯化的细胞外肽提取物的细菌素活性测定

[背景]自然界中的大多数细菌并不是独立存在,而是存在于复杂的多物种中生物膜群落(López等,2010)。两者之间存在大量的身体和营养相互作用细菌有助于生物膜的生长和存活。细菌素的产生和分泌细胞外空间为生产者与其他竞争者赋予了独特的生态优势存在于同一生态位中的细菌(Donia and ...

Isolation of Keratan Sulfate Disaccharide-branched Chondroitin Sulfate E from Mactra chinensis
Author:
Date:
2017-08-05
[Abstract]  Glycosaminoglycans (GAGs) including chondroitin sulfate (CS), dermatan sulfate (DS), heparin (HP), heparan sulfate (HS) and keratan sulfate (KS) are linear, sulfated repeating disaccharide sequences containing hexosamine and uronic acid (or galactose in the case of KS). Recently, a keratan sulfate (KS) disaccharide [GlcNAc6S(β1-3)Galactose(β1-]-branched CS-E was identified from the clam species M. chinensis. Here, we report the isolation protocol for KS-branched CS from M. chinensis. [摘要]  包括硫酸软骨素(CS),硫酸皮肤素(DS),肝素(HP),硫酸乙酰肝素(HS)和硫酸角质素(KS)的糖胺聚糖(GAGs)是含有己糖胺和糖醛酸(或半乳糖 KS案)。 最近,从蛤蜊种群中鉴定了硫酸角质素(KS)二糖[GlcNAc6S(β1-3)半乳糖(β1 - ] - 支链的CS-E),这里我们报告了分离方案 用于来自中华猕猴桃的KS分枝CS。
【背景】在组织中发现GAG作为蛋白多糖(PG)糖缀合物的聚糖部分。 CS是由N,N-乙酰基-D-半乳糖胺(GalNAc)和葡萄糖醛酸(GlcA)的线性,硫酸化重复二糖序列组成的GAG型。另一种GAG类型的DS通过葡萄糖醛酸C5-差向异构酶对CS的作用进行生物合成,将其GlcA转化为CS差向异构体,艾杜糖醛酸(IdoA)。其他GAG类型HS和HEP由N,N-乙酰基-D-氨基葡糖(GlcNAc)和GlcA / IdoA的硫酸化重复二糖序列组成。 KS由GlcNAc和半乳糖的硫酸化重复二糖序列组成。其中,CS的结构变化,如硫酸化模式和岩藻糖基化,取决于物种和组织的来源。例如,具有结构[-4] GlcA(β1-3)GalNAc4S(β1-)(其中S表示磺酸盐残基)的A-单元是在哺乳动物或鸡气管软骨CS中发现的主要二糖,而C-具有结构[-4] ...

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