Wikipedia:Reference desk/Archives/Science/2019 January 12

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January 12

What's the explanation for late allergy discovering

Sometimes people find that they allergic for something in the late ages, for example to eat something, after they ate the same things for long time and they didn't have any noticeable problem with it. So my question basically is if an allergy to something starts late or it always there but it just increase with time? 93.126.116.89 (talk) 06:13, 12 January 2019 (UTC)

Allergy has general info about the subject. Googling "allergies developing later in life" yield a number of entries, such as this one.[1] ←Baseball Bugs ^{What's up, Doc?} carrots→ 07:03, 12 January 2019 (UTC)

Don't resort to Google for that; use PubMed. I tried adult onset allergies there, and a recent review sort of exists [2]; unfortunately it is paywalled to one of those journals you don't even have to look up if your library has because you know there's no chance of it. As a special favor to Nimur I won't tell you to use Sci-Hub, mostly because it grinds away for a while before getting a timed out message from the journal's own site. It wasn't one of their better days. But there are lots of other things on PubMed to read, like [3] which describes adults catching allergies, and (like children) often growing out of them. I encourage you to go further through the list and tailor the search to your specific research interests. Wnt (talk) 20:19, 12 January 2019 (UTC)

Can ferns be successfully grafted?

I've found plenty of literature regarding grafting gymnosperms and angiosperms but extremely little on grafting ferns. Is the lack of information due to ferns having an inability to be grafted? Or is possible to graft them, but it's just very rarely done? OrganoMetallurgy (talk) 19:24, 12 January 2019 (UTC)

According to this, "Formation of secondary PD (Plasmodesmata) is considered necessary for successful graft unions [...] grafting is indeed possible in ferns, indicating that, in spite of the absence of secondary PD in their tissues, ferns [...] can form secondary PD in special cases". However, these "special cases" do not seem to translate to common occurrence within horticultural practice, or rather, grafting with ferns is perhaps just so seldomly successful that it isn't attempted. The Royal Horticultural Society's Propagating Plants (ISBN 1405300612) has 5 pages devoted to ferns, and covers the following methods of propagation: sowing spores, planting bulbils, planting plantlets, simple division, division of rhizomes, propagation from stolons, propagation from auricles, layering, and separating offsets (tree ferns). No mention of grafting. Similarly, The Plant Lover's Guide to Ferns by Richie Steffen and Sue Olsen (ISBN 978-1-60469-474-1) states: "Gardeners can propagate ferns by three means: division, rooting bulbils, and sowing spore". Again, no grafting. PaleCloudedWhite (talk) 21:56, 12 January 2019 (UTC)