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  • Misconceptions in Chemistry
    Students have problems switching from the level of substances to the level of particles and they like – even in advanced classes – to stay on the level of substances: ‘‘hydrogen chloride plus acid gives hydrochloric acid’’.
  • Biotechnology for Biofuels | Full text | Evaluation of preservation methods for improving biogas production and enzymatic conversion yields of annual crops
    Dilute sulfuric or hydrochloric acids , as well as organic acids, are commonly used for pretreatment of various raw materials prior to enzymatic hydrolysis [8], but usually in significantly more severe conditions than those applicable for ensiling. Sulfuric acid treatment prior to anaerobic ensiling was found to enhance the conversion of reed canary grass and switch grass to ethanol [9], indicating that lower levels of acid amendments to ensilage can have the desired effects.
  • Multiple Representations in Chemical Education
    … possible that they are not familiar with or are not able to mentally switch between different modes … … it was found that many first year undergraduates were able to define ‘strong acid ’ as being … However, only 46.6% of them were able to choose a diagram (Fig. 3.2) that represents the sub-microscopic level of hydrochloric acid.
  • An Egyptian Cartonnage of the Graeco-Roman Period
    A 100µl aliquot of 6⋅0N hydro- chloric acid (sequanal grade from Pierce Chemical Company) was added, and the vial capped with a Mininert valve. … to hydroly- sis, a 22-gauge side-port needle attached to a gas switching valve was inserted … The depth of the needle was kept well above the level of the acid solution.
  • Experimental study of the influence of raw material impurities on yellowness index of transesterification polycarbonate
    Prior experience had shown that there is indeed significant ‘‘uncatalysed’’ reaction in stand- ard borosilicate glass flask due to the presence of trace levels of sodium on the surface.7 It was also found that switching to quartz reactors the catalytic effect … The latter effect was suppressed by rinsing the pipettes thoroughly with hydrochloric acid and deionized water.
  • Effect of β-endorphin on g cells in rats with experimental duodenal ulcer
    increased somatostatin formation, switching of synthesis in G-cells to the formation of other peptides, such as … … synthesis, for we know that endogenous opioids block the rise in its blood level in cysteam- • ulcer [i], and lower the secretion of hydrochloric acid in the stomach [3].
  • A new technique for microdetermination of sulphur compounds by the iodine-azide reaction in aqueous and aqueous-organic media with a modified Coleman nitrogen ...
    A blank is determined in the following way: pipette into the special reactor (in the thermostatic bath) 2 ml of sodium azide solution, 1 ml of 0.1M iodine, and 1--2 ml of hydrochloric acid to decrease the pH of the … Close the reactor with its rubber cap, switch on the magnetic stirrer and set the analyser to … When the "sweep" cycle is complete, adjust the alkali level and read the counter indicating nitrogen volume …
  • The kinetics of absorption of so3 in calcium and magnesium oxides
    At time zero the flow was switched to the reactor and the effluent composition was monitored. … effluent, After some hours however the absorption rate declined to a very low level so that the … At this point the run was terminated and the ab- sorbent analyzed by dissolving in standard hydrochloric acid , followed by back-titration with standard alkali.
  • Principles and Technical Aspects of PCR Amplification
    … simply places his/her hands inside the cabinet to perform the manipulation and then switches on the UV … … has also been documented that UV-light may be used to reduce low level PCR contamination from … If problems with work surface contamination persists after UV-light irradiation or cleaning with 1N hydrochloric acid , then treat- ment of the surfaces with psoralene may be tried [Jinno et al., 1990].
  • Industrial Fire Protection Engineering
    until the current load in the cable tray increased to its pt:!ak level due to the … Most of the equipment damage in this fire was due to the smoke and corrosive hydrochloric acid vapors generated by the hurning cable insulation. The open tlesign of the telephone switching equipment allowed the soot and Hel to contaminate sensitive electronic …