Hemiptera plant. Phloem sap, which has a higher concentration of sugars and nitrogen, is under positive pressure unlike the more dilute xylem sap. Most of the Sternorrhyncha and a number of Auchenorrhynchan groups feed on phloem. Phloem feeding is common in the Fulgoromorpha, most Cicadellidae and in the Heteroptera. The Typhlocybine Cicadellids specialize in feeding on non-vascular mesophyll tissue of leaves, which is more nutritious than the leaf epidermis. Most Heteroptera also feed on mesophyll tissue where they are more likely to encounter defensive secondary plant metabolites which often leads to the evolution of host specificity. Obligate xylem feeding is a
Transport (SAP) Transport (SAP) A SAP transport is a package which is used to transfer data from one SAP installation to another. This data can range from a simple printer driver to a whole SAP client. It can be considered as an "update", with the only difference being that SAP transports are made by the SAP users themselves. Transports can also be used to transfer data from external applications. Most of the time the SAP transports are used to implement some new features in a production system. Since a production system (especially a business-dependent one) cannot be used for development (and testing),