I am trying to understand Shine-Dalgarno. I currently know it is related to ribosomal binding sites, it is only found in prokaryote cells and it is in front of the initial codon.
Another question I had is how do you recognize that it is Shine-Dalgarno?
@Hexacoordinate-C At least in ChemDraw 12, there is the "Main toolbar", if this is set vertical, the second column, eigthth entry from the top will be "Drawing tools". Take the arc labelled by 90. Draw this once on the canvas; copy this one and rotate it for 180 degree; arrange the two to form a lentil-like shape.
Then, create two wedges, both for the left and the right, as if you were to draw propane. Tilt them with the 3D-lasso into perspective; and add H's and B's.
Eventually move the items into a reasonable ensemble, add the H's on the bananas -- if you intend to draw the 3centre-two electron bonds
Since these arcs are just a drawing without chemical meaning, ChemDraw may mark the atoms in question by red rectangles.
On the other hand, the arcs may be drawn more bold, and hence yield results like
Alternatively, scale the cyclopropane, and tweak the orientation of asymmetrically drawn p-orbitals (orbital tools), for example. Some prefer this way for banana.
Another question but about chemistry this time, I have troubles to understand this : pubs.acs.org/doi/abs/10.1021/ja408861p they give a mechanism (proposed) which involve a L-M-H molecule but I don't figure out which one it is
Wikipedia article claim that :
An aqueous solution is a solution in which the solvent is water
So basically, is writing $\ce{HCl(aq)}$ equals to : $\ce{HCl(l) + H2O(l)}$ ?
> The ability of small intestine cells to absorb nutrients and act as a barrier to pathogens is 'significantly decreased' after chronic exposure to nanoparticles of titanium dioxide, a common food additive found in everything from chewing gum to bread, according to new research.
> it can enter the digestive system through toothpastes, as titanium dioxide is used to create abrasion needed for cleaning. The oxide is also used in some chocolate to give it a smooth texture; in donuts to provide color; and in skimmed milks for a brighter, more opaque appearance which makes the milk more palatable.
> A 2012 Arizona State University study tested 89 common food products including gum, Twinkies, and mayonnaise and found that they all contained titanium dioxide.
it's a scientific paper, published in a reviewed journal
> Zhongyuan Guo, Nicole J. Martucci, Fabiola Moreno-Olivas, Elad Tako, Gretchen J. Mahler. Titanium dioxide nanoparticle ingestion alters nutrient absorption in an in vitro model of the small intestine. NanoImpact, 2017; 5: 70 DOI: 10.1016/j.impact.2017.01.002
> Researchers have studied the effects of oral exposure to titanium dioxide, an additive (E171) commonly used in foodstuffs, especially confectionary. They have shown for the first time that E171 crosses the intestinal barrier in animals and reaches other parts of the body. Immune system disorders linked to the absorption of the nanoscale fraction of E171 particles were also observed.
> Sarah Bettini et al. Food-grade TiO2 impairs intestinal and systemic immune homeostasis, initiates preneoplastic lesions and promotes aberrant crypt development in the rat colon. Scientific Reports, 2017; 7: 40373 DOI: 10.1038/srep40373
@CowperKettle A lot of journal articles say something like ''it is possible that we may have found a possible potential connection between X and Y but further research may be potentially required about X's effects, Y, Z, N, M, some other letters and it may need to potentially be made clearer the possible link between the potential causes'' and the media goes crazy ''DEFINITE LINK BETWEEN AIDS AND AUTISM''
I am trying to understand Shine-Dalgarno. I currently know it is related to ribosomal binding sites, it is only found in prokaryote cells and it is in front of the initial codon.
Another question I had is how do you recognize that it is Shine-Dalgarno?
Wikipedia article claim that :
An aqueous solution is a solution in which the solvent is water
So basically, is writing $\ce{HCl(aq)}$ equals to : $\ce{HCl(l) + H2O(l)}$ ?
The difference is that resonance occurs mostly in closed systems (ring structures) while mesomeric effect occurs in open system ( long chains)
The Periodic Table
The Periodic Table