Structure Definition and 1000 Threads

According to Snustard and Simmons the structure of DNA polymerase III is the following, where the clamp loader( γ -δ complex ) is present on one side: But according to Lehninger the clamp loader is centrally located: Which one is right? Besides where can I find a correct diagrammatic...

Hi, For school, I have to give the Lewis structure of C3H5+ ion. There is a method explained, which is fairly easy, and has always worked. It has also worked for ions. However, this is the first time I have to give the Lewis structure of a positive ion.The valence of the C atom is 4 electrons...

I created interpolative curvefits to the graph of Earth's density as a function of radius, shown here: (Image from Wikipedia) Earth is assumed to be a sphere of radius 6371 kilometers. The independent variable r is the geocentric distance as a fraction of the Earth's radius; i.e. the range of...

Homework Statement In the example A , Why the author stated the total reactions = 9 only ? How to determine the total reactions for this type of questions ? Homework EquationsThe Attempt at a Solution we can see that there is a total of 3 reactions (vertical , horizontal and moment) at the...

From Frank Wilczek's book 'A Beautiful Question' 'Quantum mechanics shows how the poverty of energy imposes structure' P196 Is he saying the poverty of energy imposes structure in the energy of a quantum system or structure in matter? Or both? If we look at an atom it has ordered structure in...

Here is my question and please tell what is wrong in this? So let's think that we have rail and we move Somekind batteries in this rail and we have also solar elements to get energy to power this rail system and a lamp to throw out enregy from this thing that we move. And what we move is...

I would like to find the crystal structure of (Pb0.5Sn0.5)Te I was told it is similar to NaCl basically an XY crystal I think it is called Space Group: 225 I would like to know the first, second, third ...layer of atoms closest to a X atom...and perhaps their distance... I found...

This is schematic band structure for the dxz and dyz orbitals using a 2D square Fe lattice. What is the location in the Brillouin zone of the hole-like Fermi surface and the electron-like Fermi surface?

Hello everyone! I am not actually posting this discussion regarding a homework problem. But I wanted to get some ideas from you all about how to approach the analysis of a structure I am looking at for a Statics Project. The structure is very complex, and my project partner and I are trying...

I was wondering how they managed to know the internal structure of Earth and it's composition while there is lava and it's very hot such that no any instruments can get there...seriously I am confused

Homework Statement I've been given the worked answer to a very similar question, but there's a step I don't understand so I can't apply it. My question asks: An energy level with ##J=\frac{11}{2}## has six hyperfine sub-levels with these relative energies...

As an electronic engineer I am not an expert on semiconductor physics but I think I understand the basics of energy band diagrams reasonably well. It all fits together fairly neatly with the normal textbook assumption that we are looking at pure N-type or P-type doping. The problem I have is...

Homework Statement Why can't we have 4s^2 3S1 calcium? I've looked up a table of terms and this is never given, so I guess we can't have it. Why can't the spins of each of the outer electrons add to give S = 1, J = 1, and a degeneracy of 3? I guess the answer must be pretty basic since nobody...

Let's say you have a good personal computer with these characteristics: i7-6700K, 32GB RAM, 256GB SSD, 2 x GTX 970 4GB And let's assume you can run your algorithms, software... for 24 hours. I wonder, if I would be calculating the orbital structure of an hydrogen atom with many electrons...

hi, I got inspiration from alien, Prometheus, and knight of Sidonia(Japanimation) in these SIFI contents, I ve seen artificial things that stand quite long time. when it comes to man made structure, material, or method, I wonder is there any chance to survive million year on earth? structure...

1. A substrate molecule may be bound to the active site of an enzyme by all of the following EXCEPT A. Hydrogen Bonds B. Peptide Bonds C. Ionic Bonds D. Van der Waals Interactions E. Hydrophobic Interactions 2. Which of the following components is the most important in determining the 3-D...

I have a question to anyone experienced with graphs and topology. The question is relevant for this topic: https://www.physicsforums.com/threads/a-graph-based-model-of-physics-without-dimensions.887694/ Is it possible to construct an arbitrarily large graph (a set of vertices, a set of edges)...

So I keep getting this problem wrong and I don't know what's wrong. The structure I came up with is attached. If anyone can help I'd really appreciate it!

Hello, I have to calculate the cut-off energy of Beryllium that have hcp structure with the paramters: a=2.29Å and c=3.58Å. WHAT I HAVE DONE SO FAR: Using plane (100) or (010) Since the formula is: $$E=\frac{1}{2} \times G^2$$ $$G=\frac{2 \Pi}{2d} $$ $$\frac{1}{d^2} = \frac{4}{3} \times...

I have question about the proof of Cartan's structure equation in the context of pincipal bundle in Nakahara's book. The attached image is taken from the book. To show that the curvature two-form ##\Omega ## satisfies ##\Omega (X,Y) = {d_P}\omega (X,Y) + [\omega (X),\omega (Y)]## The author...

i think it should have double bond with o

I am looking for any references about 2-dimensional lattice structures (ie hexagonal like graphine) that have the highest shear strength (or just resistance to distortion in the 2D plane). Does anybody have any good references for this?

How fluids would act around the circumference of a space centrifugal, where the habitable zones are. Given that we have a radial gradient of Artificial Gravity , plus Coriolis, inertia, frictions etc. Id expect some change. Will add a list of questions but this more like an open discussion...

In C++ we have 2 types of data structures :- 1)simple data structure so array and structure come in simple data structure group 2)compound data structure so stack,queue,link list,tree come in compound data structure group. In Indian board CBSE data structure linked list is not included it is...

Homework Statement http://holland.pk/uptow/i4/4af070d190cc175e6ca5d326cd60cda2.png The attempt at a solution the question have a possible solution? that equation is based on stress is constant, so how to use this equation to proof? i m a year 2 student. i can only solve part i...

Hi, I need to figure out how much weight a 5 foot steel pipe will support before becoming unsafe. I am building a series of out door pull up bars for my neighborhood as an eagle project. I need to buy the right pipe/tube that will be sturdy enough but not have too big of a diameter that you...

Hey guys, I need your help. I have to write a homework and we are actually looking at structure functions (Kolmogorov 41 and so on), but I have no clue what it does. So I have formulas, but I do not understand what a structure function is. Is it something in the "real world" or is it just a way...

Hello everyone, i m working on a full circle space centrifuge concept. I try to support it with some maths but i don't want to dive into crazy details. I used alrdy lot of countermeasures to dangerous effects.I have problems similar to bridge mechanics. The design is not solid so i need to be...

I am trying to make a connection between the two in terms of the electron configuration for an atom relative to the octet rule for Lewis Dot diagrams. Maybe I just don't understand what the electron configuration represents. Why is it that Lewis Dot diagrams utilize 8 valence electrons as a full...

Hello, I was building some test crystal structures with VESTA software and I noticed when generating the POSCAR output files to be read by VASP that for a simple monoatomic basis such as in elemental silicon crystals some distinct space groups produce the same exact POSCAR files (i.e. same...

what is the chemical composition of common processed paper and what does the molecule's structure look like?

My question is more general but I explain it by a simple example i.e. graphene and tight binding method. I solved energy dispersion of graphene with tight binding by the two ways: First, I took graphene as a lattice with the two basis atoms A and B. In the second way, I took graphene as a...

Dear all, I made a cad of floating structure (the frame only), figure attached below. It should be located in the water and moored, so it can't go anywhere. The CFD simulation was done. So I have fluid force on the structure. Now I want to do mechanical analysis of the structure by apply the...

So I have two sets, call it ##A## and ##B##. I also have a function ##f:A\rightarrow B##. By themselves, it does not matter (or at the very least make sense) to think of ##A## and ##B## as, say, groups (I'm not really thinking exclusively about groups, just as an example). For that matter, it...

Homework Statement Homework EquationsThe Attempt at a Solution I am guessing P is a noble gas and Q is in group I. Therefore A, B, C and E can be canceled out. S is a transition metal. It is a metal lattice structure. But I guess it could be described as a giant structure, so would you say D...

I want to plot band structure silicene in the following path: Γ→M→K→Γ Do the following equation for the above path is correct: close all clear all clc aa=2.28; a=3.86; a1=(a/2)*[sqrt(3),-1,0]; a2=(a/2)*[sqrt(3),1,0]; b1y=-(2*pi)/a; b1x=(2*pi)/(sqrt(3)*a); b2x=b1x; b2y=-b1y; %K-point pKx =...

The standard approach to explaining band structure is to assume that the electrons in a solid move in a potential from the ions, which is periodic leading to Blochs Theorem and the formation of band structure. But I am a bit confused at this point. Is the approach only valid for the valence...

Hi I recently skimmed through a book called the Structure of Theory. It's a book about what kinds of theories exist. I would like to learn more about this. What books and websites can you guys recommend? I would prefer a resource with specific examples of what kinds of theories exist in...

If like charges repel each other, what keeps the protons clustered in the nucleus of the atom from separating ? and why wouldn't the electrons with a negative charge pull them out from the nucleus ?

Can someone describe for me the dipole pattern that was detected related to the fine structure constant? This thread talks about that pattern some. What I am trying to understand is how that dipole is oriented relative to the observer on Earth? Are we talking about a toroidal shape with a...

I'm looking for the theoretical calculation of the hyperfine structure transition frequency of Ca-133 which is used in atomic clocks to define the second according to SI-Units. Google, Google... there is a lot about the hyperfine Hamiltonian of hydrogen, but couldn't find none about that of...

Why does glucose on prolonged heating with HI give n-hexane? What mechanism/reaction type is this? All I knew till now was that alcohols would give halogen substituted products with hydrogen halides.

Homework Statement How many covalent bonds should be there to make a molecule have a giant molecular structure? Homework EquationsThe Attempt at a Solution

Dear Forum, I know that in a solid molecules have a more compact organization. Are molecules arranged in a periodic structure, i.e. a crystal, in all solids? Do all solid have a crystalline organized structure? Polymers exhibit crystal organization of the same type only over small finite...

Hi. With regard to the Fine Structure Constant, I have been trying to figure out the practical applications of the formula in nature but have had difficulty trying to discern what the 137 denominator in the equation represents. ie, it is 1 137th of what? Or, 137 whats? Is there a practical...

What determines the crystal structure taken by metals? For example Sr has FCC and Ba BCC. The packing fraction is greater for FCC. However, due apparently to coordination number and number of "next nearest" neighbors, BCC is favored in the case of Barium despite its lower packing fraction...

I am currently taking graduate course in GR following Carroll and Wald and we just started covering causal structure. In all my years studying physics this has been the first time something made me stop and go "I would love to spend a decade on this". To me it's a perfect blend of well posed...

Please could someone explain to me what is meant by the follow sentence: "Intrinsic oxygen vacancies in the TiO2 structure might also play important roles as nucleation sites for cavitation." I understand the nucleation bit but what are "oxygen vacancies in the structure"? Any help would be...

Hi, My father has been dedicating a lot of his time to making our soon-to-be home as "rewarding" (I guess) and as nice as possible for when its done. The new side project would be this. It is supposed to be some rain-proof place for a bench/table outside. There are going to be three (more or...

What do we mean by break points in band structure ? and what that sentence means : "if the band index were chosen in such a way that the energies are indexed in ascending order for any k then break points would appear in the εnk vs. k plot (with n fixed) wherever two lines intersect." ...