The scientific study of chemical processes in living organisms, including, but not limited to, living matter.

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Catalyzation in Carbonic Acid

I understand the basics of carbonic acid + 1 kcal breaking down into water and carbon dioxide. However, my professor wants me to draw an energy map showing the catalyst in human blood reducing the ...
3
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1answer
36 views

What are the steps to creating synthetic glucose?

I need to know how to go about creating synthetic glucose with generally available materials. As I am aware of both photosynthesis and glucose in nature, I will not need lessons in how plants produce ...
2
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1answer
64 views

Factors controlling enzymatic phosphorylation of D-ribulose 5-phosphate

Considering the Metabolic Pathway: http://www.genome.jp/kegg-bin/show_module?M00166 Consider the reaction R01523(the very first reaction). How is it possible to know that the compound ...
2
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1answer
35 views

Name of these parts in CoQ10?

Am giving presentation over Coenzyme Q10 Wednesday for my final project, but we haven't studied any biochem this year. So questions have arisen. CoQ10 has a Quinone head, an isoprenyl tail, and ...
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2 views

Relationship between toxicity of drugs and negative effects on brain [migrated]

Are substances (drugs) that have lower potential lethal doses more neurotoxic (more damaging to the brain)? For example, Tetrahydrocannabinol (Cannabis) has a much higher lethal dose than ...
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1answer
36 views

What is the meaning of scores when comparing reaction classes in the KEGG database

With respect to related R class in KEGG website: http://www.genome.jp/tools-bin/relclass?RC00064 What is the biological or statistical relevance of the score? How is it computed? And does it signify ...
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1answer
53 views

How are RDM patterns for reactions in the KEGG database constructed? [on hold]

With respect http://www.genome.jp/dbget-bin/www_bget?rp:RP00167 can anyone tell me how the RDM pattern were obtained?? Information what RDM is given here: http://www.genome.jp/kegg/reaction/ Note: ...
2
votes
2answers
65 views

How would you add saccharide residue information to PDB files?

I have multiple PDB files containing a single molecules of polysaccharides, with a single chain and a long list of all the atoms -they are not divided by residue. The PDB files were created from ...
4
votes
1answer
49 views

Why is Omega-3 a polyunsaturated and not a monounsaturated fatty acid?

If Omega-3 is a fatty acid with a single double bond at the third carbon atom from the omega end, then why is it regarded as a polyunsaturate and not a monounsaturate? Are there different Omega-3s ...
0
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1answer
37 views

Finding 1/V from absorbance in Lineweaver-burk plot

I’ve got six test-tubes with $0.5\ \mathrm{ml}+0.5\ \mathrm{ml}$ of 0.005 %, 0.0025 %, 0.00125 %, 0.000625 %, 0.0003125 % and 0.0003125 % starch and 4.2 pH phosphate buffer solution (2, 4, 8, 16, and ...
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19 views

Calculating Vmax (or Kcat) given specific activity of an enzyme over length of time incubated with an activator

Is it possible to figure out the Vmax (or kcat) and/or Km from a plot of enzyme activity expressed as specific activity over time (i.e. U/mg on the Y and time on the x axis). I've figured out how to ...
5
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1answer
36 views

Can bone mineral be obtained in pure, crystalline form?

Can bone mineral be obtained in pure, crystalline form outside a living organism? Had this been done ever?
3
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1answer
62 views

What is the difference between the esterification and transesterification?

What is the difference between the esterification and transesterification. Esterification objective is the formation of an ester by reacting- alcohol and a carboxylic acid.I am more concerned ...
4
votes
1answer
67 views

How is the “quasi-steady-state” assumption of Michaelis-Menten kinetics different from the steady state assumption of ordinary kinetics?

In Wikipedia's article for Michaelis-Menten kinetics, it titles the "[ES] = constant" section the "Quasi-steady-state approximation". Lehninger's Principles of Biochemistry, 4th Ed. pp. 203ff call ...
5
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1answer
44 views

What program could I use to create a protein model from scratch?

I would like to create protein models such as the ones in the Protein Data Bank. I have got GROMACS but I don't know if it can be used to model macromolecules.
4
votes
1answer
32 views

In the Haworth projections of D and L glucose, is the stereochemistry at every carbon except the anomeric carbon just inverted?

I'm having a bit of trouble grasping sugar stereochemistry. Using glucose as an example, if you cyclize D and L glucose, is the stereochemistry at every carbon just inverted from the other form? ...
5
votes
1answer
49 views

Reduce Decomposition Of Gylcerin

Background: Glycerine, when heated with a metal coil, decomposes below its boiling point to acrolein, which in turn appears to decompose to formaldehyde and acetaldehyde. (see previous post) ...
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3answers
2k views

Drinking 18 M-ohm water

What would be the effect if someone were to drink ultra-pure, 18 M-ohm water? Would they immediately die? Would they just need to pee more? Would $\ce{CO_2}$ from the air (after the bottle is ...
5
votes
1answer
36 views

How can you tell if a sugar is D/L in its chair form?

I'm having trouble determining if sugars are D/L in their chair forms. My textbook has generously provided this image of D-Glucose. So I know that from the fischer, when I put everything into a ...
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0answers
16 views

What are side chain order parameters?

I was reading an article: We first compared experimental (S 2 exp) and computed (S 2 calc) side-chain order parameters using the simplest approximation of side-chain conformational variability, ...
4
votes
1answer
35 views

Why is it that less useful energy can be extracted in explosive reactions?

If you extract energy from a substrate (e.g. glucose) step-wise, a lot more free energy is released that can be used. However, if you were to do this in one single step, very little useful energy ...
3
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0answers
12 views

Tandem Mass spec a1 and immonium ions

In tandem mass spectrometry of proteins one will usually end up with a mix of $b$ and $y$ fragments but also $a$ fragments and immonium fragments. My problem is that wouldn't an $\ce{a1}$ ion be the ...
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1answer
47 views

For protease, lipase, and amylase, include an image of the chemical, and the chemical that it operates [closed]

I have no idea how to find a picture for these enzyems. My teacher did not explain the chemical reaction and I am really lost. Please help!
4
votes
0answers
58 views

Solve this chemical or biological mystery

I hope this is the best place to pose this unique question. Please forgive me if it's not. I went into a closet to get a prescription medication that was filled about a year ago. The label on the ...
2
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1answer
45 views

Water in the ultrasonication bath

Why something jelly forms in the water if it is kept in in a ultrasonication bath for long periods? When water is exposed to ultrasonication for say a month, some jelly substances form in the ...
3
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1answer
43 views

A question about osmolarity and osmotic pressure

You have discovered a new strain of bacteria called Tankeromyces subtilis that has a special outer membrane that is capable of withstanding high levels of osmotic pressure. These bacteria can ...
5
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1answer
55 views

Viewing a protein or bio structure in Chembio3D in its natural conformation

I notice when using SMILES or a IUPAC name for many molecules and generating them in Chembio3D, and then running MM2 > Minimize Energy, the structures produced are most of the time not reflections of ...
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1answer
47 views

What is the probability of us being “orderly”?

At first this question might get the following response, "What are you talking about?". But really all I am kind of asking is: What is the probability of us humans being disorderly? Or in other ...
2
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1answer
45 views

What does “NADH (sodium salt)” mean?

From what I understand, NADH does not contain any sodium, so why is it being referred to as a sodium salt? Were sodium ions added to NADH? If so, why were they added? On a related note, why is its ...
2
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1answer
84 views

Why might two different chemical structures smell the same?

From what I understand, it is the functional group attached to a structure that determines the odor it will give off, for the most part. Which explains why two similar molecules, except for their ...
2
votes
1answer
39 views

What does Kdep stand for?

I'm looking at some data with substrate concentration on the $x$-axis and $k_{dep}$ on the $y$. What does $k_{dep}$ mean? I understand that it must be a rate of some kind but what is the significance ...
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2answers
309 views

When an enzyme is diluted with water, what is slowing down the rate of reaction?

I'm specifically talking about the decomposition of hydrogen peroxide by bovine catalase. The number of catalase molecule obviously doesn't change, so there's the same number of catalase molecule ...
2
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1answer
39 views

Do sugar alcohols have the potential to get a person drunk?

From what I understand is ingesting high amounts of sugar alcohols can lead to various effects such as abdominal pain and diarrhea, my question is, is there a certain amount of sugar alcohol if ...
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0answers
28 views

Why does egg yolk turn white when washed with water?

I recently noticed that whenever I washed the egg yolk stuck on some utensils the water becomes milky white. It has to be the egg yolk that turns white and give off the white color to water right?
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3answers
678 views

Can we prolong life? [closed]

This is rather a bunch of questions that I decided to post on Chemistry StackExchange since I thought the chemists would have the most knowledge about the chemical processes of life. So recently I ...
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2answers
32 views

Can I use my extech pH 60 meter to measure soil pH if so how?

Can I use my extech pH60 meter to measure soil pH if so how? I included a link to the meter. Extech pH 60
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1answer
18 views

How exactly is energy created by oxidative phosphorylation

I understand how the protons and electrons move around through various carriers, shuttles and proteins...But there's this talk of electrons being in "lower in energy" at the end. What does that mean? ...
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1answer
32 views

Converting 26.62 NOx µg/L into mM (millimolars)?

I have to convert a whole lot of nutrient data : $\ce{NH_4}$, $\ce{PO_4}$ and $\ce{NO_x}$ data that is in µg/L into mM (millimolars). Could someone give me an example for 26.62 $\ce{NO_x}$ µg/L? or ...
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1answer
24 views

Paper making alternative

Is there any paper making alternative? What is there in trees that makes it the only thing from which paper can be made? Do we even need paper anymore with all electronic devices and stylus', etc
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1answer
29 views

How is it that fructose has a different metabolic pathway than glucose but yet glucose is converted to fructose?

Fructose is described to have a different metabolic pathway (a more fat-inducing one) than glucose (see: http://healthyeating.sfgate.com/difference-between-sucrose-glucose-fructose-8704.html) as it ...
3
votes
1answer
109 views

How do you identify reducing / non-reducing sugar by looking at structure?

Identifying reducing / non-reducing sugar been confusing me for a while now , I know that reducing sugar contain aldehyde or ketone group . It's easy to identify them in monosaccharides but this ...
7
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0answers
56 views

Similar proteins in milk, oats and eggs [closed]

I have read that the proteins present in oats are similar to those in soy, milk and eggs. I know nothing about biochemistry, and am struggling to decipher the info I've found... The closest I've come ...
2
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0answers
43 views

Hemoglobin equilibrium - effect of increased carbon dioxide and lactic acid

The binding of oxygen by haemoglobin giving oxy-haemoglobin is partially regulated by the concentration of $\ce{H3O+}$ and dissolved in $\ce{CO2}$ in blood $$\ce{HbO2 + H3O+ +CO2<=>H+.Hb.CO2 + ...
12
votes
3answers
144 views

Is it possible to make a drug that liquefies heart plaque to treat heart disease?

Is it possible to make a drug that liquefies heart plaque to treat heart disease without damaging other parts of the body? If so, would the liquefied plaque be eliminated as regular fluid is through ...
3
votes
1answer
50 views

¹H-MRS Detection of Dopamine

Why is it difficult to detect dopamine using $\ce{^1H}$ Magnetic Resonance Spectroscopy (MRS) in the brain (in vivo)?
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0answers
20 views

Estimating the protein concentration of an unpure protein solution

I'm confused on this problem for estimating protein concentration. Upon first glance, it looks like a simple Beer's law problem. but then there's the issue that the protein is not pure. How do I ...
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2answers
127 views

Is most of the weight you lose actually released as carbon dioxide when you exhale?

I've heard that most of the weight you "lose" is actually carbon dioxide released when you exhale. In percent its much more than what is released in pure heat energy and feces. Does anyone have ...
3
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2answers
91 views

Carbonic acid-hydrogencarbonate buffer system pH calculation?

I am learning about the pH of buffer solutions, and am slightly confused by my text book's calculation. For the blood's buffer system of carbonic acid and hydrogencarbonate ions as the conjugate case, ...
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0answers
17 views

Microorganism preventative solution safe for using on a roof and will last in the sun

Information is scarce in the roof cleaning industry and the big guys are making a killing selling chemicals that are harmful to the person using it and everything around the home. I would like to find ...
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2answers
85 views

Pathway from Sucrose to Cholesterol

I was reading Linus Pauling's book How to Live Longer and Feel Better, and in various places in the book he discusses a correlation between increased sucrose intake and increased blood plasma ...