Search found 585 matches

by sdekivit
Tue Jan 01, 2008 9:40 am
Forum: Physiology
Topic: Help with Immunology
Replies: 3
Views: 9648

Re: Help with Immunology

helper T cells do not directly activate cytotoxic T cells; these can be activated by the antigen presenting cells directly after interacting with the MHC-I:antigen complex and costimulatory molecules. However, helper T cells activate APCs more then the recognition of the potential harmful antigen an...
by sdekivit
Mon Aug 27, 2007 6:55 am
Forum: Molecular Biology
Topic: Getting started
Replies: 6
Views: 4326

2. AT-bonding is done by using hydrogen bonds, not oxygen bonds. because AT contains 2 H-bonds and CG 3 the AT concentration determines the melting point of the DNA. a H-bond is caused when the electron of the H-atom is unequally divided over 2 atoms. Usually, H-bonds exist with N,O or F present as ...
by sdekivit
Thu Aug 23, 2007 5:45 pm
Forum: Molecular Biology
Topic: enzyme activity rate question
Replies: 5
Views: 2777

a very rough estimation of the rate of reaction is 6/15 = 0.4 mM / min
by sdekivit
Fri Aug 17, 2007 8:23 pm
Forum: General Discussion
Topic: Biomedical science
Replies: 6
Views: 6376

i'm just obtained my B.Sc degree biomedical sciences in utrecht and the post above looks just like my curriculum: 1st year: cell biology, molecular genetics, anatomy, biostatistics, neural regulation, biochemistry, physical chemistry, organic chemistry, histology 2nd year: analytical methods in the ...
by sdekivit
Tue Aug 14, 2007 12:44 pm
Forum: Human Biology
Topic: Anticholergenics as possible Nootropics...sorta
Replies: 2
Views: 3327

that certainly is true, but the fact that the recptor will be up-regulated will occur when blocking the AChR for longer periods. The site of the inhibition will determine the outcome of 'the experiment'.
by sdekivit
Fri Aug 03, 2007 7:55 am
Forum: Genetics
Topic: Can XY give birth?
Replies: 12
Views: 14328

must it be human :P
by sdekivit
Wed Aug 01, 2007 7:46 am
Forum: Molecular Biology
Topic: using cheek cell dna
Replies: 2
Views: 2548

i did it a year ago. here's the protocol 1. vigorously scrape the inside of the cheek with a toothpick 2. place the toothpick in a clean microcentrifuge tube and add 1 mL water. Vortex 10 seconds and spin in a centrifuge 45 seconds at 10.000 rpm. 3. remove the toothpick and do not disturb the pellet...
by sdekivit
Mon Jul 30, 2007 10:10 am
Forum: General Discussion
Topic: Need help from cardiovascular disease experts
Replies: 2
Views: 1908

just two formulae:

1) resistance ~ (length of tube) * (viscosity) / (radius of the tube)^4

2) flow ~ 1/resistance

so when a vessel is narrowed, the resistance greatly increases, so the flow greatly decreases
by sdekivit
Mon Jul 30, 2007 10:05 am
Forum: Cell Biology
Topic: Glycolysis
Replies: 4
Views: 27921

ATP is present at stable concentrations in the cell and thus is not necessarily derived from previous metabolic pathways.
by sdekivit
Sat Jul 28, 2007 9:38 pm
Forum: Cell Biology
Topic: nucleus stained
Replies: 5
Views: 3532

to what was your primary antibody ? and hat is the main goal of the study :p otherwise it will be hard to tell the function of staining the nucleus.
by sdekivit
Sat Jul 28, 2007 9:36 pm
Forum: Microbiology
Topic: Virus DNA/RNA Questions
Replies: 9
Views: 8799

To prevent virus from replication you need protease inhibitor in the cases in which the virus RNA encodes polyprotein which is then cleaved. DNA viruses uses the host cell enzymes to replicate ( and RT) and this is not possible for them. if you mean RT = reverse transcriptase, then you're not talki...
by sdekivit
Sat Jul 28, 2007 9:34 pm
Forum: Microbiology
Topic: Virus DNA/RNA Questions
Replies: 9
Views: 8799

Re: Virus DNA/RNA Questions

I have a few questions. Do viruses work without their genetic material? I mean can they still infect cells without genetic material? Does the virus or genetic material get damaged or destroyed if a poison is inserted? If you can answer these, then thanks. in order to affect a cell, the genome of a ...