Search found 9 matches

by hplc
Mon May 11, 2009 5:51 pm
Forum: Cell Biology
Topic: The Immune System - Recognition in innate immunity. How?
Replies: 2
Views: 11680

The Immune System - Recognition in innate immunity. How?

Hello. Hope you can help me with this question; I've been reading about the aquired immune system, and I understand the recognition process that this immune response involves. But how does for example the macrophages (or another cell used in the innate immune system) recognize their targets? What de...
by hplc
Mon Feb 16, 2009 7:09 pm
Forum: Cell Biology
Topic: cAMP as second messenger in GPCR signal transduction
Replies: 3
Views: 6278

Re: cAMP as second messenger in GPCR signal transduction

Thank you very much for your help.
by hplc
Sun Feb 15, 2009 12:31 pm
Forum: Cell Biology
Topic: cAMP as second messenger in GPCR signal transduction
Replies: 3
Views: 6278

cAMP as second messenger in GPCR signal transduction

Hello. I'm currently reading about the signal transduction from G protein-coupled receptors in relation to the cAMP second messenger. But after this chapter, in every example of signal transduction, the book uses cAMP as a second messenger and activator of protein kinase A. They do this for the rest...
by hplc
Thu Jan 29, 2009 6:15 pm
Forum: Cell Biology
Topic: Isolation of Mitochondria
Replies: 2
Views: 2996

Re: Isolation of Mitochondria

If you have homogenated cells you can use differential centrifugation. It's easy, and gives good results if you measure very exactly. If you sentrifugate the cells for 10 minutes with 1,000 g you should get pellet rich in nuclei and cellular debris. Another 20 minutes with 20,000 g and you should ha...
by hplc
Tue Sep 30, 2008 11:15 am
Forum: Molecular Biology
Topic: Hydrogen bonds
Replies: 4
Views: 3372

Re: Hydrogen bonds

I know which atoms can participate in hydrogen bonds, but I don't understand how I'm supposed to do this task. Say from Nitrogen; Am I supposed to draw a hydrogen bond to a OH-group that I make somewhere, for instance?
by hplc
Mon Sep 29, 2008 4:29 pm
Forum: Molecular Biology
Topic: Hydrogen bonds
Replies: 4
Views: 3372

Hydrogen bonds

Hey There is a task in my textbook I need help with. "Draw all possible hydrogen bonds for the two molecules below. Both between similar molecules, and between one on each kind." Picture of the two molecules are below. I hope you can help me. Thanks. http://www.diskusjon.no/uploads/monthly...
by hplc
Mon Sep 29, 2008 1:01 pm
Forum: Molecular Biology
Topic: Molecular geometry
Replies: 1
Views: 2470

Molecular geometry

Hi.

Can someone please help me find out the molecular geometry for the NH2CH2COOH-molecule, and tell me how they found it?

Thank you so much.
by hplc
Thu Sep 04, 2008 5:18 pm
Forum: Genetics
Topic: Homologous chromosomes during meiosis
Replies: 3
Views: 7898

Thank you for a helpful reply.

I know that the term homologous doesn't mean perfectly alike, but that the locus are positioned on the same place in a pair of chromosomes. So, this means that every individual within the same species have homologous chromosomes?
by hplc
Thu Sep 04, 2008 1:17 pm
Forum: Genetics
Topic: Homologous chromosomes during meiosis
Replies: 3
Views: 7898

Homologous chromosomes during meiosis

Hello. I'm a first year biology student, and I'm currently reading a text-book on genetics and evolution. But there is a part about the meiosis I don't understand. According to the book, two sets of homologous chromosomes are inherited from each parent. But I can't understand how two random individu...