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Fatty acids resources:

Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5 || Follicle and follicular cells research abs 1 || Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs





Med Dosw Mikrobiol. 2000;52(3):283-93.
[Evaluation of the usefulness of various PCR method variations and nucleic acid hybridization for CMV infection in immunosuppressed patients]

[Article in Polish]

Siennicka J, Trzcinska A, Litwinska B, Durlik M, Seferynska I, Palynyczko G, Kantoch M.

Zaklad Wirusologii PZH w Warszawie.

In diagnosis of CMV infection various laboratory methods are used. The methods based on detection of viral nucleic acids have been introduced routinely in many laboratories. The aim of this study was to compare nucleic acid hybridisation method and various variants of PCR methods with respect to their ability to detect CMV DNA. The studied material comprised 60 blood samples from 19 patients including 13 renal transplant recipients and 6 with acute leukaemia. The samples were subjected to hybridisation (Murex Hybrid Capture System CMV DNA) and PCR carried out in 3 variants: with one pair of primers (single PCR), nested PCR and Digene SHARP System with detection of PCR product using a genetic probe in ELISA system. The sensitivity of the variants ranged from 10(0) particles of viral DNA in nested PCR to 10(2) in single PCR. The producer claimed the sensitivity of the hybridisation test to be 3 x 10(5) and it seems to be sufficient for detection of CMV infection. The obtained results show that sensitivity of hybridisation was comparable to that of single PCR and the possibility of obtaining quantitative results makes it superior, on efficacy of antiviral therapy, especially in monitoring CMV infection in immunossuppressed patients and in following the efficacy of antiviral treatment.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11147270&dopt=Abstract



Biochemistry. 2001 Jan 16;40(2):543-8.
Unwinding of unnatural substrates by a DNA helicase.

Tackett AJ, Morris PD, Dennis R, Goodwin TE, Raney KD.

Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, USA.

Helicases separate double-stranded DNA into single-stranded DNA intermediates that are required during replication and recombination. These enzymes are believed to transduce free energy available from ATPase activity to unwind the duplex and translocate along the nucleic acid lattice. The nature of enzyme-substrate interactions between helicases and duplex DNA substrates has not been well-defined. Most helicases require a single-stranded DNA overhang adjacent to duplex DNA in order to initiate unwinding. The strand containing the overhang is referred to as the loading strand whereas the complementary strand is referred to as the displaced strand. We have investigated the interactions between a DNA helicase and the DNA substrate by replacing the displaced strand with a nucleic acid mimic, peptide nucleic acid (PNA). PNA is capable of forming duplex structures with DNA according to Watson-Crick base pairing rules, but contains a N-(2-aminoethyl)glycine backbone in place of the deoxyribose phosphates. The PNA-DNA hybrids had higher melting temperatures than their DNA-DNA counterparts. Dda helicase, from bacteriophage T4, was able to unwind the DNA-PNA substrates at similar rates as DNA-DNA substrates. The results indicate that the rate-limiting step for unwinding is relatively insensitive to the chemical nature of the displaced strand and the thermal stability of oligonucleotide substrates.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11148049&dopt=Abstract



J Cell Sci. 2001 Jan;114(Pt 2):377-88.
Telomere associations in interphase nuclei: possible role in maintenance of interphase chromosome topology.

Nagele RG, Velasco AQ, Anderson WJ, McMahon DJ, Thomson Z, Fazekas J, Wind K, Lee H.

Department of Molecular Biology, University of Medicine and Dentistry of New Jersey - School of Osteopathic Medicine, Stratford, New Jersey 08084, USA. nagelermdnj.edu

The relative sizes of individual telomeres in cultured human cells under conditions of cell cycling, replicative quiescence, cell transformation and immortalization were determined using quantitative fluorescence in situ hybridization (Q-FISH) with a telomere-specific peptide nucleic acid (PNA) probe. Results obtained from analysis of telomere length profiles (TLPs), which display the distribution of relative telomere lengths for individual cells, confirmed telomere length heterogeneity at the single cell level and proportional shortening of telomere length during replicative aging of virus-transformed cells. TLPs also revealed that some telomeric ends of chromosomes are so closely juxtaposed within interphase nuclei that their fluorescent signals appear as a single spot. These telomeric associations (TAs) were far more prevalent in interphase nuclei of noncycling normal and virus-transformed cells than in their cycling counterparts. The number of interphase TAs per nucleus observed in late-passage E6/E7-transformed cells did not increase during progression to crisis, suggesting that telomere shortening does not increase the frequency of interphase TAs. Furthermore, interphase TAs were rarely observed in rapidly cycling, telomerase-positive, immortalized cells that exhibit somewhat shortened, but stabilized, telomere length through the activity of telomerase. Our overall results suggest that the number of interphase TAs is dependent more on whether or not cells are cycling than on telomere length, with TAs being most prominent in the nuclei of replicatively quiescent cells in which nonrandom (even preferred) chromosome spatial arrangements have been observed. We propose that interphase TAs may play a role in the generation and/or maintenance of nuclear architecture and chromosome positional stability in interphase nuclei, especially in cells with a prolonged G(1)/G(0) phase and possibly in terminally differentiated cells.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11148139&dopt=Abstract



Mol Endocrinol. 2003 Jul;17(7):1283-95. Epub 2003 Apr 17.
Crystal structure and nuclear magnetic resonance analyses of the SAND domain from glucocorticoid modulatory element binding protein-1 reveals deoxyribonucleic acid and zinc binding regions.

Surdo PL, Bottomley MJ, Sattler M, Scheffzek K.

European Molecular Biology Laboratory, Structural and Computational Biology Programme, 69117 Heidelberg, Germany.

The glucocorticoid-modulatory element-binding proteins, GMEB1 and GMEB2, are ubiquitous, multifunctional DNA-binding proteins with important roles in the modulation of transcription upon steroid hormone activation. The GMEB proteins have intrinsic transactivation ability, but also control the glucocorticoid response via direct binding to the glucocorticoid receptor. They are also mandatory host proteins for Parvovirus replication. Here we present the 1.55 A resolution crystal structure of a central portion of GMEB1, encompassing its SAND domain, which shares 80% sequence identity with the GMEB2 SAND domain. We demonstrate that this domain, also present in numerous proteins implicated in chromatin-associated transcriptional regulation, is necessary and sufficient to bind the glucocorticoid-modulatory element (GME) DNA target. We use nuclear magnetic resonance (NMR) and binding studies to map the DNA recognition surface to an alpha-helical region exposing the conserved KDWK motif. Using site-directed mutagenesis, key residues for DNA binding are identified. In contrast to the previously determined NMR structure of the Sp100b SAND domain, we find that the GMEB1 SAND domain also comprises a zinc-binding motif. Although the zinc ion is not necessary for DNA binding, it is found to determine the C-terminal conformation of the GMEB1 SAND domain. We also show that homologous zinc-binding motifs exist in a subset of SAND domain proteins and probe the roles of this novel motif.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12702733&dopt=Abstract [PubMed - in process]



Clin Chem. 2001 Jan;47(1):31-40.
Linked linear amplification: a new method for the amplification of DNA.

Reyes AA, Ugozzoli LA, Lowery JD, Breneman JW 3rd, Hixson CS, Press RD, Wallace RB.

Molecular Systems Division, Bio-Rad Laboratories, 5500 East Second St., Benicia, CA 94510, USA.

BACKGROUND: Linked Linear Amplification (LLA) is a new nucleic acid amplification method that uses multiple cycles of primer extension reactions. The presence of nonreplicable elements in LLA primers renders primer extension products unusable as templates for further amplification, leading to linear accumulation of products. Through the use of nested primers, linear reactions can be "linked", providing total amplification yields comparable to those obtained by PCR. METHODS: The LLA model predicts (a) that amplification yield will approach that of PCR as the number of primers increases and (b) that the unique composition of LLA products will give lower carryover amplification efficiency compared with PCR. To test these hypotheses, the human ss-globin gene was amplified by 10-, 14-, or 18-primer LLA and the yield was compared with PCR. Carryover contamination was simulated by reamplifying a dilution series of LLA or PCR products. To demonstrate the clinical utility of the method, LLA coupled with allele-specific oligonucleotide (ASO) capture was used to detect the factor V Leiden mutation in a panel of 111 DNA samples. RESULTS: Fourteen- and 18-primer LLA gave amplification yields comparable to PCR. However, LLA carryover amplification efficiency was four orders of magnitude lower than that of PCR. The LLA-ASO assay detected the correct factor V Leiden genotype in all 111 samples. CONCLUSIONS: LLA is a robust target amplification method that is comparable to PCR in yield. However, LLA is more resistant to false results caused by carryover amplicon contamination.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11148174&dopt=Abstract







Natural Herbal Supplement: Hair Million


Hair loss alone does not pose significant health problems. In fact, there are people who opt for baldness as an alternative hair style. However, in general, however, hair loss is not considered desirable.

The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer a biologically essential part of our body, just like appendix. The hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

While the hair loss and resulting baldness in general have not been proven to be related to underlying health problems, there are certain correlations between hair loss and health problems. For instance, premature hair loss could suggest premature aging or nutritional and hormonal imbalance, stressful life, use of drugs that cause hair loss as a side effect, skin disease, or heart disease. The balding appearance could also impart a subdued impression of integrity in bodily health and youthfulness.












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