Session Start: Tue Feb 17 12:42:46 2009
Session Ident: #Chemistry
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[16:05] <Alyssa> Hi Dr. Sturm, is this chat room mainly for asking questions and things
of that nature?
[16:06] <DrSturm> Yes, it is an office hour to ask questions on course material.
[16:06] <Alyssa> Oh ok
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[16:32] <Parham> Hello
[16:33] <Alyssa> Hi
[16:33] <Parham> Is Dr Sturm available3
[16:33] <DrSturm> Yes
[16:34] <Parham> Is it possible to chat with you privately for a moment?
[16:34] <DrSturm> No, you can e-mail or see me on campus during my ofiice hours
(MW 10:00-11:00AM)
[16:35] <Parham> Then I will stop by tomorrow morning to see you... Thank you
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[17:05] <DrSturm> Do either of you have any questions?
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[17:29] <DrSturm> Alena if you have questions just type them in and hit return (enter).?
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[17:35] <Alena> why do acids turn lumis red and not any other color
[17:36] <DrSturm> The paper is initailly blue and treated to react with liquids of low pH,
i.e. acids, to turn the paper red
[17:37] <DrSturm> BTW alpha, beta, gamma, delta are the letters of the greek alphabet
[17:38] <Alena> what is the ph in coca cola?
[17:39] <DrSturm> quite acidic I am guessing pH around 4-5, it conatins phosphoric acid
[17:40] <Alena> if the ph is low and the acid is high, can their ever be where they are
both at the same level. high or low?
[17:41] <DrSturm> Acids always have low pH's 0-6 and bases have high pH's 8-13,
anything with a pH of 7 is neutral
[17:41] <DrSturm> Neutral neither acidic nor basic
[17:43] <Alena> what is aresnic compared to chlorine?
[17:44] <DrSturm> Both are elements found in the periodic table. Chlorine, Cl is a
halogen.
[17:46] <Alena> what is a metalloid and a noble gas in example of what we use in
everyday life?
[17:47] <Alena> Is every element on the periodic table use in our everday life or just
some?
[17:48] <DrSturm> A mettaloid had properties similar to a metal such as copper, a noble
gas is like helium in a helium balloon
[17:49] <DrSturm> No we definitely do not encounter every element in the periodic table
in everyday life
[17:49] <Alena> what element are in ice packs that you break, shake, and it turns cold.
and why cant it be touched with bare hands?
[17:54] <DrSturm> methylcellulose a polymer is what is found in most reusable ice
packs
[17:54] <Alena> On the lewis dot symbols, where do the dots come from the numbers on
top of the table or each row?
[17:55] <DrSturm> Each dot represents an electron and yes the total number of electrons
comes from the group number at the top of the row on the periodic table
[17:57] <DrSturm> Chat room is pretty much over, any last questions?
[17:57] <Alena> no thanks.
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Session Close: Tue Feb 17 17:57:59 2009
Session Start: Tue Feb 24 11:28:19 2009
Session Ident: #Chemistry
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[15:57] <Jicra> does anyone want to help me with chem
[15:57] <DrSturm> This chat room is only for CSU Dominguez Hills students
[15:58] <Jicra> im from there
[15:58] <Jicra> could you help?
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[15:59] <DrSturm> Yes if you are in Chemistry for the Citizen, CHE 102 or
Biochemistry
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[16:47] <Alena> If you have two minus on the lewis dot symbols, does that make it a
positive?
[16:48] <DrSturm> Not sure what you mean? 2- means two less electrons
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[17:00] <Alyssa> Hi Dr. Sturm, I'm having trouble finding the two principle types of
energy..
[17:00] <DrSturm> Potential and kinetic
[17:01] <Alyssa> thank you
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[17:04] <Alyssa> Are exergonic and exothermic the same thing? As well as
edndothermic and endergonic??
[17:05] <Alyssa> endothermic*
[17:05] <Alena> Why do Arrhenius bases taste bitter or chalky. Also why do they feel
slippery or soapy
[17:05] <DrSturm> exergonic and exothermic are the same and they indicate energy
being released during a reaction
[17:06] <DrSturm> endothermic and endergonic are the same and indicate energy must
be added to a reaction
[17:06] <DrSturm> bases are bitter and slippery, these are properties so don't really have
a reason...
[17:11] <Alyssa> if something were to go from a solid to a gas is energy being released?
[17:12] <Alena> Are the UV rays in the sunlight what cause reactions?
[17:13] <Alena> Entropy*
[17:16] <DrSturm> solid to gas absorbs energy
[17:16] <DrSturm> UV rays can provide energy for a reaction
[17:18] <Alyssa> so how would we determine the answers for parts c and d of question
#3 in the hw?
[17:23] <DrSturm> which homework?
[17:23] <Alena> how do you determine magnesium nitride for the lewis dot symbol
[17:24] <Alyssa> chapter 8
[17:25] <DrSturm> Mg(NO2) so the Mg:N:O and the other "O" is attached to the N
[17:25] <Alena> what is entropy
[17:26] <DrSturm> one molecule becoming two absorbs energy while two molecules
becoming one releases it
[17:26] <DrSturm> entropy is the randomness of the system
[17:28] <Alyssa> oh ok..thank you..the subscripts kinda threw me off and confused me
[17:31] <Alyssa> is there a particular page in the book where i can find the answer to #4?
[17:31] <Alena> Is it too late to turn in chapter 5
[17:33] <DrSturm> No not really for question #4
[17:33] <DrSturm> Yes too late for Chapter 5
[17:34] <DrSturm> Each homework is only worth 5 points so better to just focus for
exam 2
[17:34] <Alyssa> oh wait..i meant #6..my mistake
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[17:37] <DrSturm> No but if you Google it you will find lot's of information
[17:39] <Alyssa> Ok, I was just making sure I wasn't overlooking it in the book.
[17:41] <Alyssa> Thank you for all of your help today!!
[17:41] <DrSturm> Any time
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Session Close: Tue Feb 24 18:00:20 2009
Session Start: Tue Mar 03 11:23:34 2009
Session Ident: #Chemistry
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Session Close: Tue Mar 03 17:53:50 2009
Session Start: Tue Mar 10 15:34:09 2009
Session Ident: #Chemistry
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[17:16] <Alyssa> hello dr. sturm
[17:17] <DrSturm> Hello
[17:19] <Alyssa> for number 10 on the ch 10 hw, how would i determine the equivalents
[17:22] <DrSturm> An equivalent is the mass which supplies or consumes one mole of
the substance
[17:23] <DrSturm> So 1 mole is 1 equivalent, 2 moles is 2 equivalents, BTW d. is
incorrect, should be 1
[17:26] <Alyssa> ok so can you help me with part a because i understand a little bit but
not enough to do it..
[17:27] <DrSturm> I don't understand part i.? There is no part i. on #10
[17:28] <Alyssa> on the chapter 10 hw there are parts a-d..because u ask for the
equivalents for the ions you listed
[17:30] <DrSturm> Yes, so what do you mean by part i?
[17:31] <DrSturm> So the answers are a) 1; b) 1; C) 2 and d) 1
[17:31] <Alyssa> oh ok..i get it
[17:35] <Alyssa> ok for #3, how would i determine if the reactions are strong, weak,
nonelectrolytes
[17:39] <DrSturm> a. K2SO4(s) (in H2O) à 2K+(aq) + SO42-(aq)
Strong
electrolyte, anything that ionizes, i.e. a., b. and d.
[17:40] <DrSturm> c. is sugar and does not become ions in water
[17:46] <Alyssa> so c. is a nonelectyrolyte??
[17:46] <DrSturm> Yes
[17:47] <Alyssa> ok so what is the definition of a weak reaction?
[17:52] <DrSturm> A solid like b. would dissolve in water to form weak electrolytes, a.
and d. are liquids in water forming ions so they are strong electrolytes
[17:52] <Alyssa> so how would i know if they're dissolving or not?
[17:55] <DrSturm> Ionic compounds will dissolve in water to form ions
[17:55] <Alyssa> oh ok..thank you
[17:55] <DrSturm> So elements that are metals forming molecules with non-metals
[17:56] <Alyssa> those will dissolve?
[17:57] <DrSturm> Yes
[17:57] <Alyssa> ok i get it
[17:57] <DrSturm> Like NaCl, CaCl2, MgCl2
[17:57] <DrSturm> Any last questions?
[17:59] <Alyssa> no.. i underdstand all the questions..thank you
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Session Close: Tue Mar 10 17:59:34 2009
Session Start: Wed Mar 18 10:33:43 2009
Session Ident: #Chemistry
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[10:51] <DrSturm> Monique are you calling yourself "Mo"?
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[10:58] <DrSturm> Need to know who "gando1" is?
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[10:59] <DrSturm> I am going to give people about five more minutes here before we
begin.
[11:02] <Mo> yes
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[11:03] <DrSturm> Who is "yello"?
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[11:04] <kobby> good morning doc
[11:04] <DrSturm> Mo is that you Monique?
[11:04] <Mo> yes its monique
[11:04] <DrSturm> O.K., first of all i am so sorry about not being on campus this week,
the Jury Duty thing has not gone exactly as I planned
[11:05] <kobby> are you doing this from the court house?
[11:05] <samantha> it happens.
[11:05] <DrSturm> You will all receive 10 points for the two missed quizzes and I will email the "actual" quizzes to you so you can see what would have been asked.
[11:05] <DrSturm> Yes from Court
[11:06] <DrSturm> This session is being documented and I will send you a copy as a
.doc file later today so don't worry about trying to take notes on the session
[11:06] <kobby> thanks
[11:07] <Liz> thanks
[11:07] <DrSturm> For "Heme Metabolism" the only important material for Exam 2 is
the clinical correlate
[11:07] <DrSturm> so....
[11:08] <DrSturm> The Van den Bergh test
[11:08] <Jackie> would that included porphyrias?
[11:08] <Jackie> include*
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[11:09] <DrSturm> Conjugated Bilirubin, the bilirubin coming from the liver reacts
immediately with diazonium salts and is an indication that the liver is fully functioning
[11:09] <DrSturm> Nothing on Porphyria's
[11:09] <Mo> Heme: what does mixed mean both unconjugated and conjugated?
[11:09] <DrSturm> Unconjugated Bilirubin does not react directly but must be extracted
with EtOH and indicates a problem with the liver itself
[11:10] <DrSturm> Jaundiace is a very, very general medical term for yellowing of the
skin and conjunctiva
[11:10] <DrSturm> Determining what is causing the jaundice is the trick
[11:11] <DrSturm> Hemolytic anemia would flood the liver with heme and the liver
would not be able to keep up and hence result in increased levels of Unconjugated
Bilirubin
[11:12] <Mo> Indirect, mixed, direct? are these the causes?
[11:12] <Jackie> so can jaundice be cause by either Hemolytic Anemia, Hepatitis, or
Biliary Duct Stones?
[11:12] <DrSturm> Hepatitis is actaully a diseae of the liver itself so would result in both
Conjugated and Unconjuagted Bilirubin, or "mixed" results
[11:12] <DrSturm> These are three examples
[11:13] <DrSturm> There are more causes of jaundice but these are the big three
[11:13] <Jackie> o ok
[11:13] <Mo> ok
[11:13] <DrSturm> No Direct, Indirect and Mixed are the test results used to diagnose
the problems, i.e. anemia, hepatitis or biliary duct stone
[11:14] <Mo> alright
[11:14] <DrSturm> So a duct stone or blockage would "block" the liver from releasing
Comjugated Bilirubin and hence lead to a build-up
[11:14] <DrSturm> Notice the duct is coming out from the liver, i.e. after the liver
processing
[11:15] <DrSturm> So does that make sense for eveyone?
[11:15] <Mo> almost
[11:15] <DrSturm> Remember you don't need to know anything else from the Heme
material for Exam 2
[11:15] <Jackie> =)
[11:15] <cindy> yes it does
[11:16] <samantha> yes it does
[11:16] <Linda> yes
[11:16] <DrSturm> Beofre i forget, remember that you do not need to know the
structures for the Urea cycle
[11:16] <samantha> no pathways or anything else correct?
[11:16] <kobby> so the bold arrows for hepatitis represents the proportions of bilifubin,
i.e 50/50
[11:16] <DrSturm> O.K. Monique think about it and see if you have any questions
[11:16] <kobby> *bilirubin
[11:16] <Mo> ok
[11:17] <DrSturm> You need to "recognize" all of the pathways, i.e. if you see them
drawn know the names of the intermediates and enzymes
[11:17] <samantha> ok
[11:17] <DrSturm> You also need to understand how the fatty Acid Synthase works just
like the problem on the worksheet for that lecture
[11:18] <DrSturm> Not sure if you consider that a pathway.
[11:18] <samantha> oh ok i meant for this lecture in particular, everything else i think i
know
[11:18] <kobby> approx how many pathways are we going to be on the hook for?
[11:18] <DrSturm> Yes, the big, bold arrows represent excess
[11:19] <DrSturm> Catecholamines, amino acids, urea, Vitamin A
[11:20] <DrSturm> For the "Overview of Biochemical Endocrinology" lecture stay with
the points in the Brief Reviw
[11:20] <DrSturm> "review
[11:20] <ABrown> why is it that the biliary duct stone causes the conjugated to build-up
but not the unconjugated?
[11:20] <Mo> ok where is the pathway for Gp?
[11:21] <DrSturm> i.e. Know the properties of hormones, the hormones controling
glucose metabolism, the Classification of the hormones by receptor properties, and the Gprotein material
[11:21] <DrSturm> The pathway for Gp is in the "Overview of Biochemical
Endocrinology" material
[11:22] <DrSturm> So what happens with Gp.....is
[11:22] <Mo> I see Gs
[11:22] <DrSturm> the hormone binds
[11:22] <DrSturm> exchange GDP for GTP
[11:22] <Mo> oh GTP
[11:23] <Mo> I got it
[11:23] <DrSturm> PLC is activated
[11:23] <DrSturm> PIP@ splits into DAG and IP3
[11:23] <DrSturm> IP3 causes CA2+ to enter the cell
[11:23] <DrSturm> DAG activates PKC
[11:24] <DrSturm> Ca2+ also activates PKC
[11:25] <DrSturm> Notice Ca2+ activates CAM Kinase and it is CAM Kinase and PKC
that give us the biochemical/physiological responses
[11:25] <DrSturm> So the Hormone is the primary messenger, IP3, DAG and Ca2+ are
the second messengers
[11:25] <Mo> Insulin, Glucagon, Epip, Cortisol are all the hormones controlling glucose
homeostasis?
[11:25] <Mo> or just Insulin and glucagon?
[11:26] <DrSturm> Yes all four, we have not yet discussed cortisol, it is a steroid
hormone
[11:26] <DrSturm> Who is "ac"?
[11:27] <ac> Joy
[11:27] <DrSturm> Over the week-end when looking ahead to Vitamin A focus on the
Roles, the active forms, the sources and consequences of deficiences
[11:28] <Mo> is cAMP a second messenger?
[11:28] <DrSturm> For the Chemistry, Metabolism and Functions know thepathways by
name only
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[11:28] <DrSturm> Yes, cAMP is a second messenger for Gs
[11:29] <DrSturm> Who is "G-protein"?
[11:29] <Mo> what about the rod pathway? in the eye
[11:29] <DrSturm> For Vitamin A make sure you notice which reactions in the pathway
are reversible.
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[11:29] <samantha> Gi inhibits cAMP correct?so there is no second messenger?
[11:29] <DrSturm> Don't need to know the rod/cone material
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[11:30] <DrSturm> Gi inhibits cAMP production
[11:30] <DrSturm> So yes...
[11:30] <Jackie> Are the consequences of deficiences under 3rd world?
[11:31] <Mo> Is the functional groups the chemistry for Vit A?
[11:31] <DrSturm> We will meet on Monday to Discuss "Vitamin A", also bring any
questions you may have for "Catecholamines" through "Overview of Biochemical
Endocrinology"
[11:31] <Mo> ok
[11:31] <DrSturm> Yes, consequences of deficiency would be primarily third world
[11:32] <samantha> will you be available for questions as well via email today?
[11:32] <DrSturm> We will also discuss the Take-home part of Exam 2 on Monday.
[11:32] <DrSturm> Yes, as always e-mail any questions.
[11:32] <samantha> ok
[11:33] <DrSturm> Remember I will e-mail the transcript for this session to you so you
will have the notes.
[11:33] <DrSturm> Ant problems with the lab so far?
[11:33] <DrSturm> "any"
[11:33] <kobby> none so far
[11:34] <Suruchi> okay thanx Dr sturm for e-mailing so i can look at it and study
[11:34] <DrSturm> O.K., the first part of isolating the Wheat Germ Acid Phosphatase
involves a lot of centrifugation!
[11:34] <Jackie> Your approximation on the lab handout of 108mL of ammonium sulfate
is for 200mL of SII correct?
[11:34] <DrSturm> Yes
[11:34] <DrSturm> It may vary slightly
[11:35] <Jackie> ok
[11:35] <Mo> Fat Mt: Carnitines only role is to transport?
[11:35] <DrSturm> Yes it acts as a transporter
[11:36] <DrSturm> Any other questions right now?
[11:36] <DrSturm> Any questions on procedures?
[11:36] <Mo> Fat Mt: what should we know about odd/even chains?
[11:36] <Mo> no questions on procedures
[11:37] <DrSturm> That they give a lot of energy and what the end products are, i.e. the
end prodcuts are different for odd chain degradation
[11:37] <samantha> for the catecholamines on all 4 adrenergic receptors do we need to
know the chart given for the CHO, fat metabolims, hormone secretion and muscle
contraction? (what each one does individually?)
[11:37] <Suruchi> Are having quiz on Monday regarding this lecture?
[11:39] <DrSturm> You do not need to know the table for Catecholamines
[11:39] <Mo> thk u
[11:39] <DrSturm> Yes, we will give the "Overview of Biochemical Endocrinology"
quiz on Monday
[11:39] <Suruchi> thanx
[11:40] <Jackie> we do need to the table above about the receptors right?
[11:40] <Jackie> need to know*
[11:40] <DrSturm> O.K., have to run will be in e-mail contact today and later in the
week so check your e-mail. ;o)
[11:40] <Mo> ok thks bye
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[11:40] <samantha> thank you dr. sturm!
[11:40] <kobby> ok, have a great weekend
[11:40] <Liz> ok, thanks
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[11:41] <Suruchi> k have a great weekend
[11:42] <Jackie> thank you
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Session Close: Wed Mar 18 11:43:16 2009