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

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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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574 views

Can we prolong life? [on hold]

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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20 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
13 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
30 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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18 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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17 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 ...
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1answer
37 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 ...
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38 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 ...
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33 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 + ...
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133 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 ...
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38 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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16 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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121 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 ...
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1answer
31 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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14 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
54 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 ...
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35 views

Identify “decoupling sites” in Glucose Oxydase reaction

Given the following coupled reactions: $$\ce{Glucose + O2 + H2O + Glucose~Oxydase -> Gluconic~Acid + H2O2}$$ $$\ce{H2O2 + TMB(star) -> TMB}$$ Identify: A potential reagent or product that ...
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1answer
22 views

How do transmembrane protein alpha helixes bind to the membrane?

I would post this in biology but as the question is biochemical in nature I decided this would be a more appropriate platform. What I'm asking is how exactly does a transmembrane protein bind to the ...
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1answer
80 views

How do I know that an acid and conjugate base are present in equimolar amounts?

Acetylsalicylic acid is a molecule in several popular drugs such as Magnyl and aspirin. Its pKa is 3.5, and I'm about to calculate the pH of a 0.010 M solution of acetylsalicylic acid. I've read up ...
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1answer
41 views

Calculating charge of amino acids (am I doing it right?)

Please consider this picture of a peptide chain: I've done some examining on the different amino acids and concluded that the chain is as follows: Lys-Leu-Gly-Ser-Citrullin (variant of arginine). ...
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1answer
15 views

Determination of a chemical compound in a non-homogeneous sample

I want to know if it is possible to determine a chemical compound in a non-homogeneous sample. I am asking this because we are aiming to create a device that will detect histamine level in fish ...
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1answer
24 views

kinetic and thermodynamic parameters of biodiesel production from lard

I want to know if someone has experimental results and calculations of the kinetic and thermodynamic parameters of Base Catalyzed Transesterification of pig fat, if not which is the method used to ...
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1answer
61 views

The meaning of different parts in the naming of glucose

There are two main types of glucose, $\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose. Can anyone please explain what is $\alpha$,D or (+)? So (maybe by permutation and combination), how many types ...
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3answers
39 views

Biochem Book age and suggestions

I'm taking chem classes, and am interested in learning a some biochem on the side, on my own. I've bee looking for a decent book, though I'm on a bit of a tight budget so not brand shiny new ones ...
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196 views

How to buy 1g of enzyme that is sold in units/mg?

I am trying to buy 1g of horseradish peroxidase. On sigma-aldrich, it is sold as units/mg. I am confused as to what this unit is. It comes in 50-150, 150-250, and 250-330 u/mg. The way I currently ...
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2answers
32 views

Rate constant and Michaelis Menten

Please consider the following figure of a concentration over time (msec) diagram with variables for an enzyme, a substrate bound enzyme and a product. Recall that $\ce{E + S \leftrightharpoons ES ...
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1answer
42 views

Why does Ammonium sulfate cause proteins to precipitate?

I'm trying to understand an observed reaction from a chem practical: You have a solution of ammonium sulfate, which you add to a bovine serum albumin solution. The proteins precipitate, and the ...
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1answer
35 views

Why don't ions have one equilibrium potential? (Nernst equation)

I know that equilibrium potentials are dependent on the ratio of ion concentrations inside and outside of the cell and temperature. I also know that the equilibrium potential is reached when there is ...
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1answer
43 views

Hydrolysing large molecules to reveal amino acids

Consider Oxytocin: I am asked to hydrolyse Oxytocin and reveal 5 amino acids which are the result of this hydrolysis. I must admit I have no idea where to begin. I know that generally amino acids ...
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1answer
33 views

What is a triglyceride?

I'm confused on what a triglyceride is, from what my text book it says its a type of gylercide, then from a website it said Glycerides can be subdivided into two categories. The first group, the ...
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1answer
99 views

Is it possible to chemically treat grass to make it digestible?

Is it possible to chemically treat grass after "harvesting" it to make it digestible by humans? I know we can "eat" grass, but we can't break it down in our stomachs. If there is some chemical ...
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3answers
69 views

Why and when is lysine charged

I'm reading about Lysine and doing some calculations on it's charge under various $\ce{pH}$. Depending on the source, Lysine is usually stated as a charged amino acid with a $\ce{NH3+}$ group. ...
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1answer
45 views

How to rationalise the protonation state of amino acids

I am learning about amino acids in various $\ce{pH}$ environments and how their groups are protonated or deprotonated in these environments. I don't need to mention a specific acid for my question, I ...
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2answers
184 views

Chirality on Propranolol

I'm a bit confused when asked to specify the chiral carbons on this sketch of Propranolol as I'm not sure how the $\ce{H3C}$ and $\ce{CH3}$ play in if they are reversed in the name like that...Does ...
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0answers
15 views

Which solvent is good for using SU-8 particle in Optical tweezers?

I'm studying Optical tweezers. I've used Polystyrene for samples. Nowadays, I've got SU-8 pillar. I wanna use that for sample, but its density is heavier than water. I can't use that. So I wanna know ...
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1answer
40 views

Which chemicals upregulate Atoh1? [closed]

Atoh1 has been shown to have cancer fighting properties. I'd like to increase the notch pathway to make it more active. How can I increase the expression of Atoh1 with a vitamin or biochemical ...
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38 views

Aluminium in Active Carbon Water Filters

So I saw on article stating concerns about eating active carbon due to high levels of aluminium found, would this have implications with active carbon water filters? Or would the aluminium not get ...
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34 views

How could click reaction take place at low concentration?

I have DBCO-functionalized resin, and the DBCO group is validated with FAM-azide. But I cannot use this resin to react with FAM-Azide-labled primer, which has very low concentration (20 μM, it is ...
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1answer
22 views

What is the Rate of Reaction of Acetaldehyde Dehydrogenase from Saccharomyces Cerevisiae?

I am working on a biochemistry project, and I need to know some information about reaction rates. What is the Rate of Reaction of Acetaldehyde Dehydrogenase from Saccharomyces Cerevisiae?
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1answer
75 views

Why and how does lycopene absorbance increase with heating?

Lycopene, which is a carotenoid and a phytochemical is the main reason for why tomatoes are radio-protective. Source 1 . Source 2 Let's cut to the chase: I was wondering if this claim of The ...
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1answer
46 views

What happens to the NADH produced by lactate oxidation?

I first want to note that I'm a layman attempting to gain an understanding of metabolism by reading resources on the internet with only a little understanding of chemistry. I've hit a snag: Oxidation ...
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1answer
60 views

Is Acrylamide carcinogenic? Why?

Recently concerned with health effects by common chemicals existent in food I've been rather busy reading article after article; and just an interesting one came around: Acrylamide (or acrylic ...
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1answer
99 views

Finding specific activity of an enzyme from Km values for a reversible enzyme reaction

I have an enzymatic equation in the form: $$E + S\xleftrightarrow[k_{-1} = 2.6\text{ x }10^{-2} \text{s}^{-1}]{k_1 = 3 \text{ x }10^8 \text{M}^{-1}\text{s}^{-1}} EX \xleftrightarrow[k_{-2} = ...
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1answer
540 views

CO poisoning - What I've been taught is a hoax?

In elementary school, I happened to ask my teacher: What is $\ce{CO}$ they talk about these days? I was then taught that Carbon monoxide "competes" with the oxygen in our blood (we were taught ...
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1answer
30 views

What is the mechanism by which sugars glycate proteins?

I was looking at why it's ok for glucose to circulate through the blood while fructose is prevented from doing so by the liver. Fructose glycates proteins more readily than glucose. This is the ...
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92 views

I have 100mg of a proteinase K lyophilized powder and I need to make it to a working concentration of 25mg/mL

So I know that I need to add $4~mL$ of solution to this powder, which will give me a concentration of the enzyme at $25\frac{mg}{mL}$. What I do not understand is how to decide how much of each of ...
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1answer
162 views

Why is the pKa (COOH) of alanine and glycine similar but the pKa (NH_3) different?

Alanine is heavier with a ($\ce{CH_3}$) than glycine which has an ($\ce{H}$). What makes them have different $pK_{a}(\ce{NH_3})(pKa: Aly=9.69 , Gly=9.60)$ but similar $pK_{a}(\ce{COOH})(pKa=2.34) $ ...
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63 views

How does photosynthesis work?

I wonder how photosynthesis works. I read the Wikipedia page, but I'm still confused. My main gap of understanding is - I assume - : I know a photon changes the velocity of an electron. But I do not ...
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1answer
46 views

Do molecules with carboxyl groups have properties of carboxyl's sub-functional-groups?

We're learning about functional groups of different organic molecules, and there are some I'm confused about: carboxyl, carbonyl, and hydroxyl. I was looking online but I couldn't find a direct answer ...