Assignment #4: Buffer Overflow Attack
For level 1, we encountered some difficulty getting started because there weren’t any instructions to guide us (image 1). For example, we attempted to use the command, ./level01 as described within the instructions, but it then asked us to input a password. Initially, we had trouble getting started because the initial command just asked us for a three-digit password.
We attempted to think of different commands to use in order to manipulate the directory to give out a password. At first we just tried to change directories and list whatever it would give us but that seemed too basic nor did it work. So, we were stuck for a while trying to figure out how to read whatever information we could get to obtain…
supported by the raw data values of the control test tubes as it demonstrated that the hydrogen peroxide and the pH buffer solution did not affect the boiling chips (which did not contain the enzyme catalase) and it was from the presence of catalase within the potato discs which caused the resulting froth…
Since acetic acid is considered a weak acid (strong within the scale of weak acids), there is a range at which the acetic acid and acetate will form a stable buffer.
Using the Henderson-Hasselbalch equation for buffers, it’s possible to calculate the pH based on the ratio of acid to conjugate base, or calculate the ratio given the pH and pKa value.
Finding charge on a protonated amine:
The pKa value given for the amino group on any amino acid specifically refers to the equilibrium between the…
This is cleaned with water and ethanol followed by etching with 10:1 HF to remove the native oxides. This is directly dipped into 10% 10-undecanoic acid in deaerated toluene for 19h, with exposure to 352 nm ultraviolet light for photoactivated alkene insertion into Si-H bonds, which creates a carboxylate-terminated surface. The Au electrode was cleaned and immersed into 1mM 11-Mercaptoundecanoic acid and 50mM phosphate buffer for about 17h to form a carboxylate-terminated self-assembled…
Reagent • 1 mM pNpp • Buffer pH 8 • Di - water
• Volume • 1ml • 1ml • 1ml
• 0Cover with parafilm or a gloved hand and mix by inverting a few times.
• 0Use this tube to reference the spec at 410nM (see appendix A for details; step 5)
• Testing your hypothesis
• 0Label two cuvettes or test tubes as “no enzyme” and “plus enzyme”.
• 0In the “no enzyme” tube prepare the following reagents.
o When using the pipettes recall that 100ul is 0.1ml
• Reagent • 1 mM pNpp • Buffer pH 8 • Di - water
For this catalase experiment it was decided that the group was to keep the concentration of catalase and hydrogen peroxide the same and only change the level of pH buffer throughout the experiments conducted. This was done to observe the effect different levels of pH buffers have on the breakdown of hydrogen peroxide and the volume of oxygen released. The results from the majority of experiments conducted reflect that though they are in consensus with the hypothesis that the volume of oxygen…
removing salts from protein samples.
The first is called gel filtration which is known as the more efficient method. To remove the ammonium sulfate from our fractionated albumin using this method we will dissolve the precipitate in 3ml phosphate buffered saline. Then we will prepare the Sephadex G-25 column by hydrating it in PBS and we will load the column by gently layering the protein sample at the top and collecting the volume which will be our desalted protein.
The second method for…
antioxidants such as ascorbic acid, vitamin E, N-acetylcystein and garlic powder.
Based on the above information, the aim of this study is to evaluate the possible protective effect of GSE on chromium induced toxicity to tongue. Chemicals:
-Potassium dichromate (K2Cr2O7): Orange colored powder obtained from El-Gomhoria Pharmaceutical Chemicals Company (Cairo, Egypt).
-Grape seed proanthocyanidin extract (GSPE): Powdered grape seed proanthocyanidinextract (GSPE) commercially known as Noxylife…
The values that arise from the feed analysis were: the dry matter, crude protein, acid detergent fibre, neutral detergent fibre, pH level and ash. Specifically, the value for the dry matter is the corrected value in order to allow for acids, volatile acids and other components that lost on oven drying. The crude protein which is determined from the total nitrogen of silage is 88.33 (g/kg DM). The value of the acid detergent fibre which is a measurement of lingin, cellulose and lignified nitrogen…
Exercise 10: Acid/Base Balance Worksheet
Assignment Due: Week 1
Student instructions: Follow the step-by-step instructions for this exercise found in your text and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus.
Please make sure that your answers are typed in RED.
Please type your Name and Student ID Number here: Stephanie Brewer 4189660
Activity 1: Normal Breathing
1. At 20 seconds, pH = 7.41…