Vacuum flask

Intro With a significant importance to the world economy, the human body, and the environment, copper has been studied and manipulated to explore its uses and properties. In the experiment performed, the copper cycle was observed by placing copper through a series of chemical reactions to demonstrate the different reaction types. Materials and Methods To begin the experiment, a 50 mL beaker was placed on a hot plate with a ring stand along with a fume hood made out of a funnel, rubber tubing,…

Microbial contamination is a constant problem, which often compromise development of all in vitro techniques. Therefor cleanliness and proper care of equipment are vital to the operation of a tissue culture laboratory to avoid the risk of contamination. In this practical, the main objective was to observe the sources of contamination and to learn maintenance techniques which are relevant to avoid the risk of contamination in the laboratory premises. While observing the cultures,…

Lactic acid was used in the polymerization process, and Stannous octoate (Sn(Oct)2) was used as the catalyst. The polymerization process was carried out in a bench top system (Fig. xxxx ), consists with two flasks of 0.5 L, a mechanical stirrer, temperature control system, condenser connected to a vacuum pump. The reaction was conducted with and without nitrogen gas to control the system innert atmosphere. Differential Scanning Calorimetric (DSC) was used to obtain thermal transitions and…

mg, 0.553 mmol), 3 (760 mg, 1.105 mmol), tris(o-tolyl)phosphine (P(o-tol)3) (13 mg, 0.044 mmol), and tris(dibenzylidene acetone)dipalladium(0) (Pd2(dba)3) (10 mg, 0.011 mmol) in anhydrous chlorobenzene (21 mL) was charged in a 100 mL round bottom flask. The resulting reaction mixture was heated at 150 °C under stirring for 3 days. Compound (2) (38 mg, 0.083 mmol) was added and stirred at 150 °C for 1 h. To that 4-bromobenzotrifluoride (25 mg, 0.111 mmol) was added and stirred at 150 °C for 1 h…

3,2-dioxaborolan-2-yl)anthracene (D1) 2,6‐Dibromoanthracene (2.00 g, 6.46 mmol) 1, bis(pinacolato)diboron (4.16 g, 16.16 mmol), PdCl2 (dppf) (0.164 g, 26.38 mmol), and potassium acetate (KOAc) (2.5 g, 26.38 mmol) were added to a Schlenk flask and kept under vacuum for 10 min. Under an argon flow, anhydrous 1, 4‐dioxane (40 mL) was added to the resulting mixture, and the mixture was stirred at room temperature for 30 min, heated at 80 °C, and further stirred for 20 h. The resulting mixture was…

CEE 467 – ENVIRONMENTAL MICROBIOLOGY NAME: ERICK PEREIRA DANTAS DATE: SEPTEMBER 4th, 2014 PROFESSOR: DR. MORTEZA ABBASZADEGAN TA: LAUREN MCBURNETT LABORATORY #2 – BACTERIOLOGICAL EXAMINATION OF WATER: MOST PROBABLE NUMBER TEST AND MEMBRANE FILTRATION METHOD ABSTRACT: The most probable number (MPN) test and the membrane filter (MF) method have as goal to detect and estimate the presence of coliforms in a sample. Their importance in the field of environmental engineering is to support…

Chapter 1 INTRODUCTION Situation Analysis People eat foods and drink water. They consume what foods they like, foods that are healthy and unhealthy, and foods that are delicious. Foods can be either solid or liquid like burger and soup, respectively. Foods are important because it gives the people energy and gives us nutrients. Keeping foods hot is one reason why foods are healthy. To store them in a container is the key. Food should be stored in containers to make it last longer. Foods easily…

Title The Copper Reaction Cycle demonstrated in the experiment shows that copper can transform into different states of matter, while still conserving mass and returning back to its original room temperature solid state. Authors Makenzie Roybal * and Erin Wimberley Section CHEM 111-554 Introduction A topic of allure to many scientists is how high levels of copper intake can result in the disruption of human metabolism, and how it can degenerate the biological well being of ecosystems. The…

solubility was observed by sedimentation of particles. Standard calibration curve of Dex-ibuprofen Dex-ibuprofen (10 mg) was dissolved in 100 mL methanol. From these stock solution aliquots of 0.2,0.4,0.6,0.8,0.10 µ/mlwere withdrawn in 10 mL volumetric flask and diluted up to the volume with methanol and phosphate buffer (ph 7.4) solutions to give concentrations of 2,4,6,8,10 g/mL. Absorption of each solution as calculated at 227.2 nm ,223nm using Elico SL 210 UV-1700 UV Visible double beam…

Extracellular or bacterial cellulose (BC) synthesized by nonpathogenic aerobic bacteria in a culture medium containing carbon and nitrogen sources can be promising biodegradable nanofibers for composite materials because of their excellent mechanical properties [1]. Although BC is chemically identical to plant-based cellulose, it exists in extremely pure form and does not contain any hemicellulose, lignin, pectin or wax materials [2]. In addition, it has higher crystallinity, degree of…