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Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
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Regulation of Sodium and Potassium01:26

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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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What is an Experiment?01:12

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An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
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Roles of Electrolytes: Sodium and Potassium01:24

Roles of Electrolytes: Sodium and Potassium

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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Interaction of Concentration and Temperature of Acetic Acid Solution on Reduction of Various Species of Microorganisms on Beef Surfaces.

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Abnormal Freezing of Milk Caused by Ice-Nucleating Bacteria.

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Counts of Six Types of Bacteria on Lamb Carcasses Dipped or Sprayed with Acetic Acid at 25° or 55°C and Stored Vacuum Packaged at 0°C.

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Revision of Section 2.4M in Standard Methods for the Examination of Dairy Products, 15th Edition <sup>1</sup>.

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Evaluation of Swab and Tissue Excision Methods for Recovering Microorganisms from Washed and Sanitized Beef Carcasses <sup>1,</sup> <sup>2</sup>.

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Microbial Decontamination and Weight of Carcass Beef as Affected by Automated Washing Pressure and Length of Time of Spray <sup>1</sup>.

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Experiments in Sanitizing Beef With Sodium Hypochlorite 1, 2.

R T Marshall1, M E Anderson1, H D Naumann1

  • 1Department of Food Science and Nutrition, University of Missouri-Columbia, Columbia, Missouri 65201; and U.S. Department of Agriculture, Agricultural Research Service, North Central Region, Columbia, Missouri 65201.

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|February 9, 2019
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Summary

Sodium hypochlorite sprays effectively reduce microbial counts on beef plate meat. The study recommends the core sampling method for accurate post-sanitization microbial assessment.

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Area of Science:

  • Food science
  • Microbiology
  • Food safety

Background:

  • Microbial contamination of meat poses a significant food safety risk.
  • Effective sanitization methods are crucial for reducing pathogen load on meat products.

Purpose of the Study:

  • To evaluate the efficacy of sodium hypochlorite sprays in reducing microbial counts on beef plate meat.
  • To compare different sanitization parameters, including sanitizer source, flow rate, line pressure, speed, and method.

Main Methods:

  • Beef plate meat was sprayed with sodium hypochlorite (pH 6.0) from commercial and electro-generated sources.
  • Variables included sanitizer flow rate, line pressure, meat speed, and sanitization time.
  • Microbial counts were assessed immediately post-sanitization and after 48-hour storage using swab and core sampling methods.

Main Results:

  • Sodium hypochlorite sprays significantly reduced microbial counts compared to water.
  • The source of sodium hypochlorite did not impact efficacy.
  • Maximum reductions of approximately 97% (swab) and 93% (core) were achieved immediately after sanitization.
  • Optimal spray application involved a single pass at 2 cm/sec or seven passes at 10 cm/sec.

Conclusions:

  • Sodium hypochlorite is an effective antimicrobial agent for beef plate meat.
  • Sanitization parameters significantly influence microbial reduction.
  • The core sampling method is recommended for assessing microbial populations after storage.
  • Further research may explore optimal application strategies for enhanced food safety.