
Product Specifications:
Item# 1021: Recombinant HIV-1 MN Envelope Glycoprotein gp120 (Baculovirus).
Concentration: See vial
Mass/vial: 100ug
Diluent: PBS
Purity: >95%
Stabilizer: None
Preservative: None
Storage: -75°C
Physical State: Frozen
Liquid Stability: At least 24 months at -75°C.
Applications: Human diagnostics, CD4 binding, Drug screening, Human T-cell CD4 studies.
Description: Gene cloned from T-cell-tropic HIV-1 MN strain and the full length recombinant envelope gp120 glycoprotein produced in the Baculovirus Expression System.
Purification: This protein is purified by immuno-affinity chromatography to >95% purity as determined by SDS-PAGE, reduced.
Specificity: This protein binds to murine monoclonal antibodies of defined epitope specificity and HIV-1 converted human serum polyclonal antibodies in ELISA and Western ELISA.
Biological Activity: This protein binds to human T-cell receptor CD4 in ELISA and Western ELISA as determined by CD4/gp120/Anti gp120 mAb-peroxidase capture ELISA. This protein activates human T-Lymphocytes (CD4+, CD4-), in vitro, as measured by RNA synthesis during G0 to G1 transition phase of antigen-binding competent cells.
Application and Instructions for use:
Recommended concentrations for use are approximate values. A dose dependent response assay should be performed to determine the optimal concentration for use in specific applications. ELISA and Western ELISA require 10-100ng protein depending on the nature and affinity of the detection reagent. Human serum polyclonal antibodies yield titers of 1:1000 or greater at 10-100ng of immobilized protein under standard ELISA conditions.
Related Clinical Trials
Official Title: | A Phase I, Multicenter, Randomized, Double-Blind, Placebo-Controlled Trial to Evaluate the Safety and Immunogenicity of HIV-1 MN rsgp120 and Bivalent AIDSVAX B/E (HIV-1 MN rgp120/A244 rgp120) in Combination With QS-21 With or Without Alum in Healthy HIV-1 Uninfected Adults |
A Phase I, Multicenter, Randomized, Double-Blind, Placebo-Controlled Trial to Evaluate the Safety and Immunogenicity of HIV-1 MN rsgp120 and Bivalent AIDSVAX B/E (HIV-1 MN rgp120/A244 rgp120) in Combination With QS-21 With or Without Alum in Healthy HIV-1 Uninfected Adults
Intervention:
Biological: MN rgp120/HIV-1 and A244 rgp120/HIV-1, QS-21, rgp120/HIV-1MN
Group 1: low-dose MN rsgp120/HIV-1 plus QS-21 (13 volunteers). Group 2: high-dose MN rsgp120/HIV-1 plus QS-21 (13 volunteers). Group 3: AIDSVAX B/E (injection contains each of the two vaccine components, HIV-1 MN rgp120 and A244 rgp120/HIV-1) plus QS-21 plus alum (13 volunteers).
Group 4: high-dose MN rgp120/HIV-1 plus QS-21 plus alum (13 volunteers). Group 5: placebo plus QS-21 (8 volunteers). Volunteers will be closely monitored after each immunization and followed for a minimum of 12 months after the initial immunization.
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我想请教下怎么避免这种情况。还有就是我用的仪器和文献中的不一样,那可以完全采用上述条件吗,还是应该根据不同的机器进行不同的转换后再超声。谢谢了!
2、加速度:液体粒子推动产生的加速度。对于频率较高的超声波清洗机,空化作用就很不显著了,这时的清洗主要靠液体粒子超声作用下的加速度撞击粒子对污物进行超精密清洗。
3、直进流作用:超声波在液体中沿声的传播方向产生流动的现象称为直进流。声波强度在0.5W/cm2时,肉眼能看到直进流,垂直于振动面产生流动,流速约为10cm/s。通过此直进流使被清洗物表面的微油污垢被搅拌,污垢表面的清洗液也产生对流,溶解污物的溶解液与新液混合,使溶解速度加快,对污物的搬运起着很大的作用。
还有水箱温度的控制
1、电路短路:
线路接错,或者是线路老化等,都有可能导致电路发生短路,从而导致超声波清洗机发生跳闸。
解决措施:纠正错误接线,或者是更换老化的线路。
2、整流桥短路
超声波发生器的整流桥发生短路,也会导致超声波清洗机跳闸。
解决措施:
用万用表的二极管档,逐个测量其整流桥的管教,如果发现有短路的管脚,则证明整流桥已经损毁,需要更换新的整流桥。
3、清洗频率设定不合适:
超声波清洗机里面的物品过多,且设定的清洗频率很高的情况下,易产生跳闸现象。
解决措施:
降低清洗频率。
二、关于超声波清洗机:
超声波在液体中传播,使液体与清洗槽在超声波频率下一起振动,液体与清洗槽振动时有自己固有频率,这种振动频率是声波频率,所以人们就听到嗡嗡声。随着清洗行业的不断发展,越来越多的行业和企业运用到了超声波清洗机。
对超声波清洗机原理由超声波发生器发出的高频振荡信号,通过换能器转换成高频机械振荡而传播到介质--清洗溶剂中,超声波在清洗液中疏密相间的向前辐射,使液体流动而产生数以万计的直径为50-500μm 的微小气泡,存在于液体中的微小气泡在声场的作用下振动。这些气泡在超声波纵向传播的负压区形成、生长,而在正压区,当声压达到一定值时,气泡迅速增大,然后突然闭合。并在气泡闭合时产生冲击波,在其周围产生上千个大气压,破坏不溶性污物而使他们分散于清洗液中,当团体粒子被油污裹着而黏附在清洗件表面时,油被乳化,固体粒子及脱离,从而达到清洗件净化的目的。在这种被称之为“空化”效应的过程中,气泡闭合可形成几百度的高温和超过1000个气压的瞬间高压。
超声波清洗机的优点是:超声波清洗效果好,操作简单。人们所听到的声音是频率20-20000Hz的声波信号,高于20000Hz的声波称之为超声波,声波的传递依照正弦曲线纵向传播,产生大量小气泡 。一个原因是液体内局部出现拉应力而形成负压,压强的降低使原来溶于液体的气体过饱和,而从液体逸出,成为小气泡;另一原因是强大的拉应力把液体“撕开”成一空洞,称为空化。
1、看频率:F≥20KHz(在实际应用中因为效果相似,通常把F≥15K的声波也称为超声波)。
2、看功率密度:p=发射功率(W)/发射面积(cm2);通常p≥0.3w/cm2;在液体中传播的超声波能对物体表面的污物进行清洗,其原理可用“空化”现象。

