Comparison of the Mechanical Properties of Fresh and Cryopreserved Aortas

melting produced a drop in pipette readings. For each gram of ice that melted, the volume change

The vial was removed from the heat and cooled to room temperature. The spin vane was rinsed with 2-3 drops of warm water over the conical vial. The vial was cooled to room temperature then placed in an ice bath for 15 minutes. The liquid was decanted from the mixture and the resulting crystals were dried on filter paper. The crystals were then placed on a watch glass for further drying. The crystals were weighed and a small sample was placed into a capillary tube for melting point determination.

In order to fulfil the labs purpose, the lab was split into two parts. The first part consisted of measuring and determining the freezing point depression of the solution water. The second part consisted of measuring and determining the freezing point depression of a solution that consisted of water and an unknown solute.

The freezing point depression constant for water that was experimentally determined in this analysis was 0.0479 °C/m, which was derived from the slope of the trend line in Figure 4. This is significantly lower than the constant stated in the literature of 1.86 °C/m.1 The freezing point temperature determined via cryoscopy should have been much lower in the high sucrose concentration solutions.

Purpose: The purpose of this laboratory was to gain an understanding of the differences between the freezing points of pure solvent to that of a solvent in a solution with a nonvolatile solute, and to compare the two.

The visit influences our practical as we gain an understanding of how in the engineering industry selection of materials is determined using indicators such as Young’s Modulus. Young’s Modulus is a measure of stiffness that is independent of the particular sample of a substance. This indicator is very vital as it determines the material’s strength, toughness

It is suspected that the freezing point is 64.1oC. Due to the short temperature plateau, It is difficult to determine if the freezing point occurs at during the interval (6:00-6:10). However, it appears to be have been the most reasonable determination for freezing point in comparison to the rest of the plot.

The aortic valve is the opening between the left ventricle and aorta. It consists of three tightly fitted leaflets that open and close in response to changes in pressure of the heart and is responsible for delivering blood throughout the body [1]. Aortic stenosis is the narrowing of the aortic valve opening [2]. This narrowing restricts blood flow from the left ventricle into the aorta, affects the pressure in the atrium and causes the walls of the left ventricle to thicken in response to the increased pressure needed to pump blood through the stenosed valve. These physiological changes result in a decrease in the amount of blood that can enter the ventricle and limits the amount of blood being circulated to the body. Consequently, the body does not receive an adequate amount of oxygen, which eventually can lead to

Blade: The material utilized to make the blades is another aspect to take into account. Generally speaking, there are three different types of materials that are used to make the blades. These are stainless steel, platinum, and titanium. Platinum retains the sharpness of the blade much longer time than stainless steel or titanium, but blades made of titanium have the advantage of keeping them resistant to water or rust.

Introduction: Acute aortic dissection (AAD) e life-threatening condition that characterizes the high mortality worldwide (7-8%). When AAD is split in the wall of the aorta where the blood circulates between layers of the wall which can lead to its rupture. Early recognition of symptoms and appropriate response to the medical team is crucial to the outcome of the patient. On receipt of a patient with chest pain to bear in mind the possibility of AAD. Standard diagnostics when fasting suspected AAD include: ECG, NIBP to the left and right hand the puts 2 venous lines, laboratory, echocardiography,

Use of readily available tissues in the lab is a great way to gain a better understanding of their functional properties, especially when that knowledge can be translated to the human body. The purpose of this study was to analyze the mechanical properties of a chicken tibia in 3-point bending to learn more about the behavior of bone under such conditions. Furthermore, any results could be compared to literature values for similar chicken bones and human bones to see how the data compare. One chicken tibia was cut from a piece of supermarket poultry and tested in 3-point bending to failure on an Instron 5544 at a rate of 10 mm/minute. Various properties were calculated from the force-displacement data using MATLAB, including the ultimate tensile strength (UTS) and Young’s modulus (E). The results were then compared to values for the same properties in chicken and human bone from published literature. Overall, the calculated UTS of the chicken tibia (9.623 MPa) was a higher magnitude than that of a human bone in bending (103 MPa, Caeiro). The Young’s modulus (3.939 GPa) of the tested chicken tibia was on par with the literature Young’s modulus for chicken tibia (10.91 GPa, Massé), while the UTS of the sample was much lower than the UTS of chicken femur (96 MPa, Erickson). These findings confirm that the bending test was carried out well from start to finish, as

Temperature and relative humidity also play a role in the physical or mechanical deterioration of records, even though in most cases maybe somewhat less so than many of us have supposed. In truth, the mechanical properties of most records materials are relatively unaffected by temperature that is within shooting range of room temperature, with one essential

As stated, our solvent in this lab will be tert-butanol. We start by recording the freezing point of this substance without anything added. Then, we add various

In order to perform an artificial aging on these 4 samples, they are transferred into a 190°C Furnace, then are removed separately after 3, 10, 60, and 120 minutes; Then all quenched into water, and their hardness tested. In addition to the above process, the hardness test of the samples # 5 and 3 are measured after a week (table 4).

When materials’ influences are to be evaluated in terms of pulpal response during vital procedures, in vivo study designs are helpful. Among these,animal and human teeth are generally preferred to demonstrate the effects of pulp capping agents. These should further be supported by clinical trials toestablish a clear picture regarding the general characteristics of the materials. MTA, which is generally considered a gold standard, has been investigated in various animal and human experimental models.