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Chem Lab Methods

Submitted by rdigregorio on Thu, 03/28/2019 - 12:26

After adding the solutions we tried our best to keep the temperatures constant as we timed the reaction. Once we noticed the color of each solution turn to a burnt yellow/orange color we concluded that the reaction was complete and stopped the timer. This data collected was our reaction time for the first trial. To get more accurate results, we performed the experiment again for 10℃, 20℃, and 30℃, and got the average reaction time at each temperature. With this information, we were able to calculate the rate of the reactions, which lead to determining the equilibrium constants, K, and eventually the slope of our observations and the activation energy.

 

3/28

Submitted by lpotter on Thu, 03/28/2019 - 11:34

The people that work there, not the actual facility itself poses the biggest risk for pathogens to escape a biosafety level 4 lab. In order work in a lab like this you must go through extensive background checks. Even your family must go through extensive checks and are subject to heavy scrutinization. This is because the pathogens in labs like this are so incredibly powerful that many people would want to try and use them to cause harm. People in the lab could either try and smuggle out samples of the virus for a payment or to cause serious damage by themselves or both. What I mean by this is that the pathogens could be sold to terrorists, radicalized militant groups, or anyone who wants to cause harm to the general public. Not only would these pathogens be very destructive to the population but they would also be very easily released and spread. If you think about how many people push open a turning door at the subway or airport in a single day you would realize how big of a threat these pathogens pose to the public. If some cases thousands of people could touch that spot in a given day. Now there are thousands of people who bring the pathogen with them and touch something else. They go home to their apartment complex, go to their work at a grocery store, go to the movies. All places where they will come in contact with thousands of more people. This is why the people in these facilities as well as the facilities themselves must be so heavily monitored.

Bias Against Gene Editing

Submitted by ncarbone on Thu, 03/28/2019 - 11:20

Despite the possible benefits of genome editing, the potential effects on future generations may outweigh the positives according to Lanphier et al. The technology could easily be abused and used for non-therapeutic modifications. There is also a potential danger in using CRISPR/Cas9 for genome editing due to the possibility of making accidental changes elsewhere in the genome. This is problematic because the precise effects of the modification may not be known until birth or even years later. Genetic modification is further an issue legally due to the lack of policies regarding genome editing in some countries such as the US (Lanphier et al. 2015).

 

Experimental Procedure

Submitted by sfairfield on Thu, 03/28/2019 - 09:56

          Benzoin (0.5 g, 2.0 mmol) and ethanol (4.0 mL, 68.0 mmol) were added to a 25-mL Erlenmeyer flask and swirled gently at room temperature until fully dissolved. Sodium borohydride (0.1 g, 3.0 mmol) was added gradually over the course of five minutes using a microspatula, and the mixture was swirled at room temperature for twenty additional minutes. The mixture was cooled in an ice-water bath, then water (5.0 mL, 278.0 mmol) and 6M HCl (0.3 mL, 9.0 mmol) were added. After fifteen minutes, the mixture was quenched with another addition of water (2.5 mL, 139.0 mmol). The product was collected via vacuum filtration on a Hirsch funnel, allowed to dry on the filter for fifteen minutes, and the crude yield and melting points were recorded. Two milligrams of crude material were set aside for TLC analysis. The remaining crude material was recrystallized in a 25 mL Erlenmeyer flask using 6 drops of acetone. The final yield and melting point were recorded. Approximately two milligrams each of benzoin, the recrystallized product, and the reserved crude product were dissolved in ethyl acetate in three separate vials. The contents of the three vials were used to spot two TLC plates such that one plate contained benzoin, crude product and a combination of those two, while the other plate contained benzoin, recrystallized product, and a combination of those two. The TLC plates were run in 9:1 CH2Cl2:ethanol solution. The spots were visualized using short-wave UV light and an iodine chamber. The Rf values were calculated. 

 

Short/long term respiration

Submitted by lgarneau on Thu, 03/28/2019 - 09:23

The purpose of the study was to see if root tolerance to high soil temperature is related to short term/long term respiratory acclimation in response to higher temperature by comparing two variants of the same species with different heat tolerances. The hypothesis is that A. scabra, the C3 plant that can withstand high temperatures, will be able to acclimate their respiration to the change in temperatures better and will be able to control carbon expenditure for a longer-term. The other plant, A. stolonifera will not be able to withstand the higher temperatures for as long.

Week9 Draft4

Submitted by mqpham on Thu, 03/28/2019 - 09:16

Research conducted on nine invasive herb species in Massachusetts will determine which of the invasive herbs poses the greatest threat to the Massachusetts economy and ecosystems. Invasive species are a threat to ecosystems especially when they compete with native species that occupy the same niche. Control of invasive plants can become costly through uses of herbicides and physical extraction. This research will narrow down on the threats of these species and determine where most attention is needed in to save government funding on invasive plant control and protecting biodiversity of local ecosystems in Massachusetts.

Week9 Draft3

Submitted by mqpham on Thu, 03/28/2019 - 09:05

The experiment would  determine the dangers of having invasive species present in the Massachusetts environment, specifically threats to the economy and ecosystems. Furthermore, we would be able to identify how the invasive species can affect of native species in their environment. Through this research, possible prevention methods for future invaders may be determined along with the necessary protocols to hone in on the most threatening invasive species.  

 

Week9 Draft2

Submitted by mqpham on Thu, 03/28/2019 - 09:01

In this experiment, we will focus on invasive herbs. Each group will be assigned one herb species from the list of invasive plants from the Massachusetts Invasive Plants Advisory Group. The plants chosen have already met the criteria designed by the MIPAG to be classified as invasive. Each group will determine the extent to which the invasive species causes harm to the economy and environment. To determine the extent to which the species poses threats to the Massachusetts economy and environment, each group will gather the information necessary to determine the severity of the invasive species. The species will be ranked from most threatening to least threatening based on its effect on the economy and environment.

 

Targeting Ghrelin to Treat Obesity

Submitted by alanhu on Thu, 03/28/2019 - 08:47

Obesity is not only a problem within itself but I can cause more problems later on such as type 2 diabetes, heart disease and more. Knowing that a single disease can lead to may other diseases sparked my interest as there may be a solution. Ghrelin is a peptide hormone that increases a person's hunger and causes the pituitary gland to secrete a growth hormone. Blocking the receptor for ghrelin would not be a wise choice because it could also cause changes in behavior and mood. Scientists then thought about blocking the pathway of ghrelin, which led them to find the molecule YIL781. YIL781 is specifically a molecule that is released by ghrelin that causes the feeling of hunger. So ghrelin can change the intensity or probability of behaviors. Therefore, the number of ghrelin being released and binding to the receptors changes throughout the day as the person eats and doesn't eat. Ghrelin would have different intensities depending on the time of day. 

 
 

fMRI-Based Lie Detection

Submitted by afeltrin on Thu, 03/28/2019 - 08:35

I lean more towards disagreeing with the notion that fMRI-based lie detection should be admissible in court cases. Perhaps in certain cases today, fMRI may prove useful in court cases. For instance, at the end of the show, when we were introduced to a mobile MRI machine used to analyze brain activity patterns of psychopaths, that could prove extremely useful in regards to determining if reintegration into society is even possible. Yet, even then, fMRI is not yet a completely accurate tool to be used in court. There comes the very real possibility of sending innocent people to jail because jurors will view this technology as completely objective; but, that is not the case. It is a very subjective form of technology, that relies on human interpretation. But, who knows? In the future, this form of lie detection could be further developed into an extremely legitimate and accurate method of determining lies and truth, and even remorse. So, for now, I don't completely agree with this statement, but my views on it could very well change years from now.

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