Plant specimens were not taken for dna analysis earlier. But now a days they are. The main thing about DNA analysis is, it is best done from fresh samples or a sample which were dried without rotting (very fast drying). Hence we use silica gel for fast drying. As the samples on herbarium sheet or even in the silica gets older the chances of DNA extraction becomes less as the dna starts degenrating. Poison can be anything from mercury chloride or even alcohol. Infact at our organisation we dont use any chemicals to kill.but still we are not able to extract DNA !!
On Tue, Nov 3, 2015 at 10:39 PM, Ushadi Micromini <[email protected] > wrote: > Tapasda > > poisoned by what ? > > mercury or something else? > > i thought some pieces of leaves are routinely taken for biochemical and > molecular analysis from herbarium specimen > > am i wrong? > > usha di > > > > > On Mon, Nov 2, 2015 at 10:42 PM, Tapas Chakrabarty <[email protected]> > wrote: > >> Ushadi, >> For molecular studies the herbarium specimens are not eligible as these >> are poisoned. Sometimes back someone requested me to send fresh leaf >> samples of Nicobariodendron sleumeri, tentatively placed under >> Celastraceae, for molecular studies to solve the problem whether it really >> belongs to the Celastraceae or a new family should be proposed. Thus if >> Nicolas ji can find out some way of preserving his materials without >> poisoning, it is quite good but at the same time he should adhere to the >> valuable suggestions given by Pankaj ji. >> Regards, >> Tapas. >> >> >> On Mon, Nov 2, 2015 at 2:43 PM, Dr Pankaj Kumar <[email protected]> >> wrote: >> >>> Dear Sir >>> I am really fascinated to see these and other images on yoru website. >>> Ideally an image to be called a herbarium specimen, it needs to be in >>> the size of A3. >>> I noticed that none of your specimens have a number (voucher number). >>> Secondly, I would suggest you to try a black background. Just spread >>> your specimens on the scanner and scan removing the upper cover. The image >>> will have a black background but smaller flowers really look very nice. You >>> can still put the lid back and scan with white background. >>> Please also remember, if someday you need to describe a new species, >>> then you need a proper specimen and not the digital one. So also remember >>> to keep the sheet with dry plant always in your collection for reference. >>> Most of the real herbaria have old specimens that dates back to 300 >>> years sometimes. They have their own importance and your work has its own, >>> so just keep going. >>> Best of luck. >>> If you need any help from me, please feel free to write to me here or >>> privately. >>> Thanks and regards >>> Pankaj >>> >>> >>> >>> On Thursday, 29 October 2015 18:05:01 UTC+8, Nicolas Lagarrigue wrote: >>>> >>>> Dear members of eflora of India group, >>>> >>>> >>>> We would like to share with you our new virtual herbarium, an online >>>> catalogue of plants from our region, including local, vulnerable and >>>> sometimes endangered species from the native evergreen forests of the >>>> Coromandel Coast of Tamil Nadu, as well as other widespread species of the >>>> Indian subcontinent. >>>> >>>> >>>> Unlike many other virtual herbaria, which use pictures of their >>>> existing collections, samples of which can be decades old, often >>>> discoloured and degraded, Pitchandikulam Forest Virtual Herbarium uses >>>> fresh specimens, briefly flattened and then scanned immediately in high >>>> definition, in order to conserve their natural colours and texture. This >>>> creates exquisite, vivid images which allow us to fully appreciate the >>>> intricate beauty of plants and to discover them more intimately. >>>> >>>> >>>> For each species, detailed botanical information is provided, including >>>> nomenclature, description, phenology, reproduction and dispersal, as well >>>> details of plant ecology, distribution, conservation status and propagation >>>> and planting advice. >>>> >>>> In addition to the detailed scientific data, it offers additional >>>> ethnobotanical information (human uses of plants for food, crafts, >>>> medicines or rituals…). >>>> >>>> >>>> Pitchandikulam Forest Virtual Herbarium is a work in progress. So far >>>> 50 plant species are available to view and learn about, with new species >>>> added continuously. >>>> >>>> If you are interested, we encourage you to join our mailing list to get >>>> the latest updates. >>>> >>>> >>>> Pitchandikulam Forest Virtual Herbarium can be found here: >>>> >>>> www.pitchandikulam-herbarium.org >>>> >>>> >>>> Enjoy your visit and share it with all the plant lovers you know… >>>> >>>> Thank you. >>>> >>>> Irène and Nico >>>> >>>> >>>> <http://www.pitchandikulam-herbarium.org/img/mail_signature.jpg> >>>> >>>> >>>> >>>> <http://www.pitchandikulam-herbarium.org/img/pitchandikulam_herbarium.jpg> >>>> >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "efloraofindia" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/indiantreepix. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "efloraofindia" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/indiantreepix. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Usha di > =========== > -- ****************************************************** **************************************************************** *Pankaj Kumar*, Ph.D. *IUCN-SSC Orchid Specialist Group Asia* *Office*: Conservation Officer Orchid Conservation Section Flora Conservation Department Kadoorie Farm and Botanic Garden (KFBG) Corporation Lam Kam Road, Tai Po, New Territories, Hong Kong. *Residence*: House no. 39, 2nd Floor, Shui Wo Tsuen Lam Tsuen, Tai Po, New Territories, Hong Kong. *email*: [email protected]; [email protected] *Phone*: +852 2483 7128 (office - 8:30am to 5:00pm); +852 9436 6251 (mobile); *Fax*: +852 2483 7194 -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. Visit this group at http://groups.google.com/group/indiantreepix. For more options, visit https://groups.google.com/d/optout.
