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2022 - 03 - 17
来源:生物谷 2021-03-14 00:052021年3月12日讯/生物谷BIOON/--汽水是一种备受欢迎的饮料,在全世界被广泛消费。食品制造商为了丰富汽水的口味,开发了各种汽水饮品。其中不乏含糖饮料。我们知道,食品中的添加糖会给健康带来负面影响,比如增加心血管疾病、肥胖和糖尿病风险等。那么,饮用含糖汽水对乳腺癌患者的影响如何呢?近日,来自美国布法罗大学的一项新研究表明,乳腺癌患者经常饮用含糖汽水会增加全死亡的风险,尤其是因乳腺癌死亡的风险。与从不或很少喝含糖汽水的女性相比,每周喝五次或以上含糖汽水的女性其全因死亡率要高出62%,而死于乳腺癌的可能性要高出85%。相关研究结果于3月2日发表在美国癌症研究协会的Cancer Epidemiology Biomarkers & Prevention期刊上,标题为Sugar-Sweetened Soda Consumption and Total and Breast Cancer Mortality: The Western New York Exposures and Breast Cancer (WEB) Study。该研究的第一作者、布法罗大学公共卫生和健康职业学院流行病学和环境卫生系的博士生Nadia Koyratty说,关于汽水和乳腺癌的研究是非常新颖的话题。因为乳腺癌非常普遍,关于生活方式选择的建议对乳腺癌幸存者...
2
2019 - 09 - 05
2016年《消失的微生物》一书问世,肠道微生态研究走入大众视野,目前全球范围内针对微生物与肥胖、哮喘、过敏、糖尿病、肿瘤、精神类疾病的研究正逐步开展。一、肠道微生物概况人体是由自身细胞及共生的大量微生物细胞所共同组成的复杂共生生命体。目前研究认为人体肠道内聚集的微生物数目可达1012~1014个,是人体自身细胞数目的10倍,微生物包含的基因数目超过987万个,人类自身基因数只有2万个左右,是人体自身基因数目的几百倍,这些后天获得的共生菌群及其所携带的遗传及分子信息即可称为微生物组。(一)人体肠道微生物是如何建立的?有研究表明,人体在出生成长过程中,主要在两个重要的环节、以两种不同的方式实现对肠道菌群的塑造。第一个环节是在分娩过程,婴儿会从母亲产道获得健康的肠道菌群,剖腹产和孕期抗生素则会改变正常婴儿菌群的建立。另一个环节则是出生后的哺乳及断奶后的膳食干预。在女性乳腺中存在着乳酸菌等系列微生物,这些微生物在哺乳过程中进入并定植于婴儿肠道。随着哺乳期的结束,日趋丰富的膳食外源营养物质则长期调节着人体肠道微生物中的的变化。(二)肠道微生物对人体健康有何影响?肠道菌群与人体互利共生,依靠人体没有消化的食物残渣和肠道分泌的黏液和脱落的死细胞作为营养来维持很高的种群水平。活跃生长的肠道菌群会产生大量的活性物质,同时包括短链脂肪酸、维生素和抗氧化等有益健康的产物,以及神经毒素、致癌物质和免疫毒素...
3
2019 - 08 - 30
最近,《自然》杂志报道了不少关于癌症的研究。上周,学术经纬团队分享了一则癌症研究的重要突破——通过荧光标记,科学家们能够看清癌细胞如何“腐蚀”周边的健康细胞,发生转移。今天,我们又读到了一篇关于癌症转移的最新论文,它深刻揭示了癌症转移的复杂性,并提醒我们,在攻克癌症的道路上,我们还有很长的路要走……先来聊聊癌症。我们知道,癌症的发展就好像是一个熊孩子长大一样,会分成不同的阶段。在早期,癌细胞会疯狂生长,侵入和传播(invasion and dissemination)到组织内,在身体里形成肿瘤。到了晚期,癌细胞则会发生转移(metastasis),跑到身体的其他器官里落地生根,形成新的病灶。现在的医学知识告诉我们,一旦癌症发生了转移,患者的生命就岌岌可危。可是,癌细胞在一个地方长得好好的,它为啥会发生转移呢?过去的很多科学家相信,这与一种叫做E-cadherin(E-钙粘蛋白)的蛋白质有关。从功能上看,它负责把不同的细胞“粘”在一起。如果癌细胞能够减少这种钙粘蛋白的表达,就会变得更有“活动性”,也更容易发生转移。不过,科学家们也观察到了一些例外——在一种叫做“乳腺导管癌”的癌症中,发生转移的癌细胞,里头的E-钙粘蛋白含量可不少。这是为啥呢?有科学家解释说,这是因为癌细胞慢慢地又把自己“粘”回到了一起。这听起来是个合理的解释,但没有让所有人感到信服。为了寻找其他原因,来自美国知名的约...
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产品名称:

Dynabeads™ CD45

上市日期: 2019-04-17
产品类别: INVITROGEN

Specifications

Capacity:Processes ~5x10^8 cells total
Cell Type:Leukocytes, Tumor Cells
Isolation Method:Depletion, positive isolation for molecular applications
Output Viability:>95%
Product Line:DYNAL®, Dynabeads®
Product Size:5 mL
Sample Type (Specific):Blood, PBMC
Starting Material (Cell #):1x10^7 PBMCs per isolation
Target Species:Human
Shipping Condition:Room Temperature


  • 产品描述
  • 产品功能
  • 产品参数

Description

Dynabeads® CD45 are superparamagnetic beads covalently coupled to anti-human CD45 antibody that enable isolation or depletion of CD45+ leucocytes directly from whole blood, buffy coat, or MNC suspensions. Dynabeads® CD45 can also be used to enrich epithelial tumor cells. The CD45 antigen is weakly expressed on myeloid cells. To efficiently deplete or isolate all leucocytes including myeloid cells, use Dynabeads® CD15 (Cat. No. 11137D) in combination with Dynabeads® CD45. Advantages of Dynabeads® CD45:

• Efficient depletion of human leucocytes
• Isolation of leucocytes directly from whole blood for molecular applications
• Enrichment of circulating epithelial tumor cells

About Dynabeads® CD45
Dynabeads® CD45 are uniform, superparamagnetic beads (4.5 µm diameter) coated with a primary monoclonal mouse IgG2a antibody specific for a CD45 membrane antigen common to all known isoforms of CD45. CD45 is expressed on all human leucocytes. Because of the bead size, Dynabeads® CD45 can easily and efficiently isolate or deplete cells from viscous samples such as whole blood and bone marrow in about 30 minutes. Dynabeads® CD45 is often used for enrichment of circulating non-hematopoietic tumor cells, by depletion of all CD45+ leucecytes from a MNC sample. Positively isolated cells can be used for downstream molecular studies; for example, those in which cells are to be lysed while still attached to beads, and nucleic acids or proteins further purified. Note that intact cells will not be released from these beads, and we do not recommend to analyze the bead-bound cells with a flow cytometer.

Magnetic bead–based separation offers easy handling
Dynabeads® CD45 is added to the sample under continuous mixing to optimize the binding of the Dynabeads® to the target cells. By placing the sample on a magnet it separates the bead-bound target cells from the rest of the sample in just 1–2 minutes. For depletion, remove the supernatant to a new tube for further studies and discard the bead-bound cells. For positive isolation for molecular studies, remove the supernatant and wash the bead-bound cells 2–3 times in buffer to get optimal purity. The cells can be lysed while still attached to the beads and the supernatant transferred to a new tube for downstream molecular analysis. Starting samples can be whole blood, buffy coat, bone marrow, PBMC, or tissue digests.


Specifications

Capacity:Processes ~5x10^8 cells total
Cell Type:Leukocytes, Tumor Cells
Isolation Method:Depletion, positive isolation for molecular applications
Output Viability:>95%
Product Line:DYNAL®, Dynabeads®
Product Size:5 mL
Sample Type (Specific):Blood, PBMC
Starting Material (Cell #):1x10^7 PBMCs per isolation
Target Species:Human
Shipping Condition:Room Temperature


Specifications

Capacity:Processes ~5x10^8 cells total
Cell Type:Leukocytes, Tumor Cells
Isolation Method:Depletion, positive isolation for molecular applications
Output Viability:>95%
Product Line:DYNAL®, Dynabeads®
Product Size:5 mL
Sample Type (Specific):Blood, PBMC
Starting Material (Cell #):1x10^7 PBMCs per isolation
Target Species:Human
Shipping Condition:Room Temperature


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