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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

Nucleic Acids Res. 2000 Oct 15;28(20):E87.
Solid phase DNA amplification: characterisation of primer attachment and amplification mechanisms.

Adessi C, Matton G, Ayala G, Turcatti G, Mermod JJ, Mayer P, Kawashima E.

Department of Genomic Technology, Serono Pharmaceutical Research Institute, Chemin des Aulx 14, 1228 Plan les Oates, Geneva, Switzerland.celine.adesserono.com

Different chemical methods used to attach oligonucleotides by their 5'-end on a glass surface were tested in the framework of solid phase PCR where surface-bound instead of freely-diffusing primers are used to amplify DNA. Each method was first evaluated for its capacity to provide a high surface coverage of oligonucleotides essentially attached via a 5'-specific linkage that satisfyingly withstands PCR conditions and leaves the 3'-ends available for DNA polymerase activity. The best results were obtained with 5'-thiol-modified oligonucleotides attached to amino-silanised glass slides using a heterobifunctional cross-linker reagent. It was then demonstrated that the primers bound to the glass surface using the optimal chemistry can be involved in attaching and amplifying DNA molecules present in the reaction mix in the absence of freely-diffusing primers. Two distinct amplification processes called interfacial and surface amplification have been observed and characterised. The newly synthesised DNA can be detected and quantified by radioactive and fluorescent hybridisation assays. These new surface amplification processes are seen as an interesting approach for attachment of DNA molecules by their 5'-end on a solid support and can be used as an alternative route for producing DNA chips for genomic studies.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11024189&dopt=Abstract

Nucleic Acids Res. 2000 Oct 15;28(20):E88.
High efficiency family shuffling based on multi-step PCR and in vivo DNA recombination in yeast: statistical and functional analysis of a combinatorial library between human cytochrome P450 1A1 and 1A2.

Abecassis V, Pompon D, Truan G.

Centre de Genetique Moleculaire du CNRS, UPR 2137, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France.

The design of a family shuffling strategy (CLERY: Combinatorial Libraries Enhanced by Recombination in Yeast) associating PCR-based and in vivo recombination and expression in yeast is described. This strategy was tested using human cytochrome P450 CYP1A1 and CYP1A2 as templates, which share 74% nucleotide sequence identity. Construction of highly shuffled libraries of mosaic structures and reduction of parental gene contamination were two major goals. Library characterization involved multiprobe hybridization on DNA macro-arrays. The statistical analysis of randomly selected clones revealed a high proportion of chimeric genes (86%) and a homogeneous representation of the parental contribution among the sequences (55.8 +/- 2.5% for parental sequence 1A2). A microtiter plate screening system was designed to achieve colorimetric detection of polycyclic hydrocarbon hydroxylation by transformed yeast cells. Full sequences of five randomly picked and five functionally selected clones were analyzed. Results confirmed the shuffling efficiency and allowed calculation of the average length of sequence exchange and mutation rates. The efficient and statistically representative generation of mosaic structures by this type of family shuffling in a yeast expression system constitutes a novel and promising tool for structure-function studies and tuning enzymatic activities of multicomponent eucaryote complexes involving non-soluble enzymes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11024190&dopt=Abstract

Nucleic Acids Res. 2000 Oct 15;28(20):E89.
Mutation analysis of the entire mitochondrial genome using denaturing high performance liquid chromatography.

van Den Bosch BJ, de Coo RF, Scholte HR, Nijland JG, van Den Bogaard R, de Visser M, de Die-Smulders CE, Smeets HJ.

Department of Molecular Cell Biology and Genetics, Maastricht University, PO Box 1475, 6201 BL Maastricht, The Netherlands.

In patients with mitochondrial disease a continuously increasing number of mitochondrial DNA (mtDNA) mutations and polymorphisms have been identified. Most pathogenic mtDNA mutations are heteroplasmic, resulting in heteroduplexes after PCR amplification of mtDNA. To detect these heteroduplexes, we used the technique of denaturing high performance liquid chromatography (DHPLC). The complete mitochondrial genome was amplified in 13 fragments of 1-2 kb, digested in fragments of 90-600 bp and resolved at their optimal melting temperature. The sensitivity of the DHPLC system was high with a lowest detection of 0.5% for the A8344G mutation. The muscle mtDNA from six patients with mitochondrial disease was screened and three mutations were identified. The first patient with a limb-girdle-type myopathy carried an A3302G substitution in the tRNA(Leu(UUR)) gene (70% heteroplasmy), the second patient with mitochondrial myopathy and cardiomyopathy carried a T3271C mutation in the tRNA(Leu(UUR)) gene (80% heteroplasmy) and the third patient with Leigh syndrome carried a T9176C mutation in the ATPase6 gene (93% heteroplasmy). We conclude that DHPLC analysis is a sensitive and specific method to detect heteroplasmic mtDNA mutations. The entire automatic procedure can be completed within 2 days and can also be applied to exclude mtDNA involvement, providing a basis for subsequent investigation of nuclear genes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11024191&dopt=Abstract

Nucleic Acids Res. 2000 Oct 15;28(20):E90.
Mirror orientation selection (MOS): a method for eliminating false positive clones from libraries generated by suppression subtractive hybridization.

Rebrikov DV, Britanova OV, Gurskaya NG, Lukyanov KA, Tarabykin VS, Lukyanov SA.

Shemiakin and Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117871 Moscow, Russia.

Suppression subtractive hybridization (SSH) is one of the most powerful and popular methods for isolating differentially expressed transcripts. However, SSH-generated libraries typically contain some background clones representing non-differentially expressed transcripts. To overcome this problem we developed a simple procedure that substantially decreases the number of background clones. This method is based on the following difference between target and background cDNAs: each kind of background molecule has only one orientation with respect to the two different flanking adapter sequences used in SSH, while truly differentially expressed target cDNA fragments are represented by both sequence orientations. The described method selects the molecules that arose due to hybridization of such mirror-orientated molecules. The efficiency of this method was demonstrated in both model and real experimental subtractions.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11024192&dopt=Abstract

Nucleic Acids Res. 2000 Oct 15;28(20):E91.
DNA probes on chip surfaces studied by scanning force microscopy using specific binding of colloidal gold.

Moller R, Csaki A, Kohler JM, Fritzsche W.

Institute for Physical High Technology, PF 100239, D-07702 Jena, Germany.

Single-stranded DNA was covalently bound on chip surfaces using two different silanization procedures. The resulting surfaces were characterized by fluorescence and scanning force microscopy using sequence-complementary DNA molecules with labels. Colloidal gold (30 nm) was used as the topographic label. Scanning force microscopy revealed the individual labels on the surface and their distribution. Steps of silane layers or DNA-modified surfaces prepared using an elastomeric mask provided internal controls for comparison of modified with unmodified surfaces.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11024193&dopt=Abstract

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Hair Loss, or alopecia is a concern for increasing number of folks in aging society. Loss of hair is a visible problem, and affects the appearance and changes identity of a person.
The phenomenon of hair thinning and hair loss is most commonly associated with natural aging, although there are many other causes of hair loss, which include inherited or genetic conditions, illnesses, malnutrition, stress, hormonal problems, chemotherapy, and use of some drugs.
Hair growth is a sophisticated biological process, which has not yet been completely understood. A multitude of therapeutic measures, including drugs, surgery, and suppelements have been made available, and used. However, due to the heterogeneity in the underlying cause, there is no perfect cure for all hair loss cases. Most of chemical drugs and hair transplantation surgeries are not free from varying degrees of undesirable side effects on health.

Hair Million is an alternative solution to hair loss problems. Anecdotally, it shows prositive results and improvement for age-related hair thinning and hair loss for a fraction of people who take it. We do not know the mechanisms of action as to how Hair Million works to help stop hair loss, and promote hair growth. We only know by anecdotal observations. There has been no clinical trials nor placebo controlled statistical analysis on the efficacy of Hair Million on hair loss and hair growth. However, there are two merits in this hair restoration herbal formula:
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DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells.

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