VWR Zero Air And Nitrogen Main. The presence of nitrogen in the cell causes all reactions in the cell to stop while mixing. Mixing stops all reactions except when plated out. Mixing stops prevent contamination of the test organism and serve to limit the volume of the sample taken. The zero air and nitrogen main can be easily removed from the main using a spatula or an e-collator. The main can then be reconnected to the zero air and nitrogen main using the corresponding adapter. The possibility of sample loss during sample introduction into the tube is minimized. However sample recovery is minimal when compared to other methods of removing solvent from an injected sample. This is less likely to happen when the sample is placed back into the well. Specifications for VWR Zero Air And Nitrogen Main MK7840 : Description: VWR ZERO AIR AND NITROGEN MAIN (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine VWR products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Chromatography with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for VWR Chromatography. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the VWR Zero Air And Nitrogen Main MK7840/ 82031-472 we carry a full complement of Chromatography as well as other product offerings from VWR. We also carry a full line of VWR accessories to help meet your laboratory and scientific needs. For a complete selection of VWR Chromatography please visit our VWR page. For more brand name Chromatography please visit our Chromatography store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. VWR Zero Air And Nitrogen Main MK7840