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Fatty acids resources:

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Plant Physiol. 1993 Sep;103(1):267-272.
Chemical Signals from Avocado Surface Wax Trigger Germination and Appressorium Formation in Colletotrichum gloeosporioides.

Podila GK, Rogers LM, Kolattukudy PE.

Biotechnology Center, The Ohio State University, Columbus, Ohio 43210.

The surface wax of the host, avocado (Persea americana) fruit, induced germination and appressorium formation in the spores of Colletotrichum gloeosporioides. Waxes from nonhost plants did not induce appressorium formation in this fungus, and avocado wax did not induce appressorium formation in most Colletotrichum species that infect other hosts. Bioassays of the thin-layer chromatographic fractions of the avocado wax showed that the fatty alcohol fraction was the main appressorium-inducing component. Testing of authentic n-C8 to n-C32 fatty alcohols revealed that C24 and longer-chain alcohols induced appressorium formation. Gas-liquid chromatography/mass spectrometry analysis of free fatty alcohols revealed that avocado wax contains a high content of very long chains. Waxes from nonhost plants containing an even higher content of the very long-chain alcohols did not induce appressorium formation. Waxes from nonhost plants strongly inhibited appressorium induction by avocado wax. Thus, a favorable balance between appressorium-inducing very long-chain fatty alcohols and the absence of inhibitors allows the fungus to use the host surface wax to trigger germination and differentiation of infection structures in the pathogen.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12231933&dopt=Abstract [PubMed - as supplied by publisher]



Plant Physiol. 1993 Oct;103(2):315-321.
Pathway of Salicylic Acid Biosynthesis in Healthy and Virus-Inoculated Tobacco.

Yalpani N, Leon J, Lawton MA, Raskin I.

AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231.

Salicylic acid (SA) is a likely endogenous regulator of localized and systemic disease resistance in plants. During the hypersensitive response of Nicotiana tabacum L. cv Xanthi-nc to tobacco mosaic virus (TMV), SA levels rise dramatically. We studied SA biosynthesis in healthy and TMV-inoculated tobacco by monitoring the levels of SA and its likely precursors in extracts of leaves and cell suspensions. In TMV-inoculated leaves, stimulation of SA accumulation is accompanied by a corresponding increase in the levels of benzoic acid. 14C-Tracer studies with cell suspensions and mock-or TMV-inoculated leaves indicate that the label moves from trans-cinnamic acid to SA via benzoic acid. In healthy and TMV-inoculated tobacco leaves, benzoic acid induced SA accumulation. o-Coumaric acid, which was previously reported as a possible precursor of SA in other species, did not increase SA levels in tobacco. In healthy tobacco tissue, the specific activity of newly formed SA was equal to that of the supplied [14C]benzoic acid, whereas in TMV-inoculated leaves some isotope dilution was observed, presumably because of the increase in the pool of endogenous benzoic acid. We observed accumulation of pathogen-esis-related-1 proteins and increased resistance to TMV in benzoic acid- but not in o-coumaric acid-treated tobacco leaves. This is consistent with benzoic acid being the immediate precursor of SA. We conclude that in healthy and virus-inoculated tobacco, SA is formed from cinnamic acid via benzoic acid.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12231938&dopt=Abstract [PubMed - as supplied by publisher]



Plant Physiol. 1993 Oct;103(2):323-328.
Induction of Benzoic Acid 2-Hydroxylase in Virus-Inoculated Tobacco.

Leon J, Yalpani N, Raskin I, Lawton MA.

AgBiotech Center, Cook College, Rutgers University, P.O. Box 231,New Brunswick, New Jersey 08903-0231.

Salicylic acid (SA) plays an important role in the induction of plant resistance to pathogens. An accompanying article (N. Yalpani, J. Leon, M.A. Lawton, I. Raskin [1993] Plant Physiol 103: 315-321) shows that SA is synthesized via the decarboxylation of cinnamic acid to benzoic acid (BA), which is, in turn, hydroxylated to SA. Leaf extracts of tobacco (Nicotiana tabacum L. cv Xanthi-nc) catalyze the 2-hydroxylation of BA to SA. The monooxygenase catalyzing this reaction, benzoic acid 2-hydroxylase (BA2H), required NAD(P)H or reduced methyl viologen as an electron donor. BA2H activity was detected in healthy tobacco leaf extracts (1-2 nmol h-1 g-1 fresh weight) and was significantly increased upon inoculation with tobacco mosaic virus (TMV). This increase paralleled the levels of free SA in the leaves. Induction of BA2H activity was restricted to tissue expressing a hypersensitive response at 24[deg]C. TMV induction of BA2H activity and SA accumulation were inhibited when inoculated tobacco plants were incubated at 32[deg]C. However, when inoculated plants were incubated for 4 d at 32[deg]C and then transferred to 24[deg]C, they showed a 15-fold increase in BA2H activity and a 65-fold increase in free SA content compared with healthy plants incubated at 24[deg]C. Treatment of leaf tissue with the protein synthesis inhibitor cycloheximide blocked the induction of BA2H activity by TMV. The effect of TMV inoculation on BA2H could be duplicated by infiltrating leaf discs of healthy plants with BA. This response was observed even when applied levels of BA were much lower than the levels observed in vivo after virus inoculation. Feeding tobacco leaves with phenylalanine, cinnamic acid, or o-coumaric acid (putative precursors of SA) failed to trigger the induction of BA2H activity. BA2H appears to be a pathogen-inducible protein with an important regulatory role in SA accumulation during the development of induced resistance to TMV in tobacco.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12231939&dopt=Abstract [PubMed - as supplied by publisher]



Plant Physiol. 1993 Dec;103(4):1243-1247.
Water Relation Alterations Observed during Hypersensitive Reaction Induced by Bacteria.

Popham PL, Pike SM, Novacky A, Pallardy SG.

Department of Plant Pathology (P.L.P., S.M.P., A.N.) and School of Natural Resources (S.G.P.), University of Missouri, Columbia, Missouri 65211.

Upon exposure to pathogenic bacteria, resistant and nonhost plants undergo a hypersensitive reaction (HR) that is expressed as rapid plant cell death. If sufficient concentrations of these bacteria are inoculated to such plant tissue, then that portion of the tissue rapidly collapses and becomes necrotic. As the tissue collapses the water relations of inoculated tissues become markedly disturbed. We measured a decline in the relative water content (RWC) in the leaf-like cotyledons of cotton (Gossypium hirsutum cv Immune 216) within the first 4 h (cut at 1 h) after inoculation with Pseudomonas syringae pv tabaci. However, the decrease in RWC was not caused by a decrease in initial fresh weight but by increased water uptake during incubation in water. By 8 h after inoculation, cotyledons still on the plant had lost turgidity, and their area decreased. K+ efflux was also observed concurrently with the decrease in RWC, providing a reason for the loss of turgidity in the tissue. These observations suggest that cells lose turgor and change shape from cylinders with large intercellular spaces to those of a more tabular shape. During this change cell walls come closer together, providing an avenue for increased water uptake through capillary action. The stomatal diffusive resistance of intact cotyledons increased; hence, water loss through stomata is not the cause of the observed wilting and RWC decline. An increase in K+ per dry weight suggests that phloem loading or movement may also be impaired during bacterially induced HR.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12232016&dopt=Abstract [PubMed - as supplied by publisher]



Plant Physiol. 1993 Dec;103(4):1311-1319.
Synergistic Enhancement of the Antifungal Activity of Wheat and Barley Thionins by Radish and Oilseed Rape 2S Albumins and by Barley Trypsin Inhibitors.

Terras F, Schoofs H, Thevissen K, Osborn RW, Vanderleyden J, Cammue B, Broekaert WF.

F.A. Janssens Laboratory of Genetics, Catholic University of Leuven, W. De Croylaan 42, B-3001 Heverlee, Belgium (F.R.G.T., H.M.E.S., K.T., J.V., B.P.A.C., W.F.B.).

Although thionins and 2S albumins are generally considered as storage proteins, both classes of seed proteins are known to inhibit the growth of pathogenic fungi. We have now found that the wheat (Triticum aestivum L.) or barley (Hordeum vulgare L.) thionin concentration required for 50% inhibition of fungal growth is lowered 2- to 73-fold when combined with 2S albumins (at sub- or noninhibitory concentrations) from radish (Raphanus sativus L.) or oilseed rape (Brassica napus L.). Furthermore, the thionin antifungal activity is synergistically enhanced (2- to 33-fold) by either the small subunit or the large subunit of the radish 2S albumins. Three other 2S albumin-like proteins, the barley trypsin inhibitor and two barley Bowman-Birk-type trypsin inhibitor isoforms, also act synergistically with the thionins (2- to 55-fold). The synergistic activity of thionins combined with 2S albumins is restricted to filamentous fungi and to some Gram-positive bacteria, whereas Gram-negative bacteria, yeast, cultured human cells, and erythrocytes do not show an increased sensitivity to thionin/albumin combinations (relative to the sensitivity to the thionins alone). Scanning electron microscopy and measurement of K+ leakage from fungal hyphae revealed that 2S albumins have the same mode of action as thionins, namely the permeabilization of the hyphal plasmalemma. Moreover, 2S albumins and thionins act synergistically in their ability to permeabilize fungal membranes.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12232024&dopt=Abstract [PubMed - as supplied by publisher]







Hair loss is a problem in modern soceity. Examining the factors of hair growth may shed light on how hair loss might occur. How long can hair grow before it stops growing eventually if it does? Given that the hair growth rate is quite uniform and constant, somewhere between 0.3-0.5 millimeters per day, it's believed that the length of anagen, the growth phase, differs among individuals, and this is the major determinant to the maximum hair length. For some individuals, anagen may last ten years. Of course the length of the anagen is governed by genes, and the genetic background of the individuals. Non-genetic factors such as nutritional condition, weather, seasonal changes (hair may grow a bit faster during winter), taking medications, health condition may of course influence the rate of hair growth as well as hair loss. The shape of the hair, straight or curly, is dependent on the shape of the follicle. A circular or round hair follicle would generate straight hair, while the follicle with oval or elliptical shapes (in its cross-section) would produce a curly hair.












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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