I had the same impression from somewhere, probably not from Esau, which I
don't have. I even told students they were one giant cell and had them
measure them for comparison to other cells, but I later read up in Fahn's
Plant Anatomy (an older text that I happen to still have) and it indicated
"a number of large juice cells" in the sac or vesicle. I dissected one sac
under the dissecting scope and it seems to be about a hundred cells, not
counting the epidermis. If memory serves aright (and my memory of
measurements is atrocious) they were about 0.5 mm across.
At 12:43 PM 9/12/00 +0100, you wrote:
>I had the impression from Esau's plant anatomy text that juice sacs are
only 1
>or 2 huge cells.
>>Gary Cote wrote:
>>> One possibility that may not work because it's a bit messy is an orange.
>> The sections are made up of little "juice vesicles" which are very visible
>> to the eye and contain only about a hundred cells. Should be visible with
>> a hand lens. Of course, the reason they're so big is the same reason
>> they're so messy -- huge vacuoles full of juice. Any citrus should do as
>> well.
>>>> Gary Cote
>>>> At 10:17 PM 9/11/00 +0100, you wrote:
>> >Dear Folks,
>> >I'm teaching a non-majors plant biology course this semester, and I'm
>> >starting a section on cells. I'm trying to include as much real
>> >observation of things as I can, but am constrained by the fact that there
>> >is no lab, and the class meets in an auditorium.
>> >Here's what I'd like to do, and I send this out to you all in hopes that
>> >someone knows how to achieve it. I'd like to pass around a leaf or chunk
>> >of tissue that has cells of enough size to be seen with a 5X hand lens.
>> >I'm only shooting for them being able to see the outlines of the cells,
but
>> >not anything within. Any candidates?
>> >Thanks,
>> >Kathleen Archer
>> >
>> >
>> >---
>> >
>> >
>> >
>> Dr. Gary Coté
>> Assistant Professor
>> Department of Biology
>> Box 6931
>> Radford University
>> Radford, VA 24142-6931
>>>> Ph: 540-831-5630
>> Fax: 540-831-6615
>> email: gcote at radford.edu>>http://www.radford.edu:8800/~gcote/>>>> ---
>>>>>---
>>>Dr. Gary Coté
Assistant Professor
Department of Biology
Box 6931
Radford University
Radford, VA 24142-6931
Ph: 540-831-5630
Fax: 540-831-6615
email: gcote at radford.eduhttp://www.radford.edu:8800/~gcote/
---