Is protoporphyrin common to all three domains of life?

Protoporphyrin (IX) ferrochelatase has an absorption peak in the UVC. Aleksandar Simeonov and I have written a paper suggesting that the fundamental molecules of life are really pigments absorbing...

05 June 2014 7,054 1 View

What is the best method to clean a quartz cuvette?

Because we have to raise our solutions to high temperature we sometimes have evaporation and therefore sticking of the organic molecules, DNA, polymerase, etc. to the inside surfaces of the quartz...

07 August 2013 1,763 13 View

Is Darwin's theory of evolution through natural selection complete and consistent?

Popper called Darwin's theory of evolution through natural selection a "metaphysical research program" principally because of the apparent tautology in "survival of the survivors". However, beyond...

07 August 2013 3,912 63 View

What is the origin of the second law of thermodynamics?

Thermodynamics seems to have an uncanny relation to general relativity. For example, the zeroth, first, second and third laws of thermodynamics have their analogs in the physics of black holes...

06 July 2013 4,458 70 View

What are the differentiating characteristics between living non-linear, non-equilibrium processes and non-living such processes?

Life, for the most part, dissipates short-wavelength photons. Hurricanes dissipate long-wavelength photons. What are some other differences between these two types of non-linear, non-equilibrium...

05 June 2013 4,889 21 View

What is the broad extinction peak at 515 nm for DNA in a standard buffer attributable to?

All our experiments with different DNA in standard buffer give a broad extinction peak at 515nm. Does anyone know where this comes from? We suspect that it is light scattering, but we can't find...

05 June 2013 7,494 0 View

In situ quantification of DNA PCR amplification using UV absorption or CD ?

Does anybody know of a method to measure, in situ, amplification of short DNA segments (< 50 bp) obtained through PCR without having to do electrophoresis? Preferred methods would be based on...

31 December 2012 6,258 0 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View