leaf

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Fig. 205 Leaf. (a) Simple leaves. (b) Compound leaves.click for a larger image
Fig. 205 Leaf . (a) Simple leaves. (b) Compound leaves.

leaf

the principal photosynthetic organ of vascular plants, which typically consists of a flattened lamina joined to the stem by a stalk or petiole, at which junction an axillary bud can be found. There are numerous types of leaves.
  1. dorsiventral leaves are held horizontally with the upper half of the lamina containing the majority of photosynthetic cells (see MESOPHYLL for diagram). Typically, the lower epidermis contains the majority of STOMATA through which gas exchange and transpiration take place. Leaf veins are usually arranged in a ‘net’ venation with principal veins called midribs. The lamina can be indented to form a ‘compound’ leaf or remain as a simple structure. See Fig. 205 . Dorsiventral leaves are typical of DICOTYLEDONS.
  2. isobilateral leaves grow erectly, with a sword-like shape and are typical of MONOCOTYLEDONS. Both epidermal surfaces contain stomata with palisade mesophyll tissue packed underneath. Isobilateral leaves have a parallel venation and are not divided into compound structures. See also KRANZ ANATOMY.
  3. centric leaves are more or less cylindrical with a central region containing the vascular bundles surrounded by mesophyll tissue. Examples are the needles of pine trees, and onion leaves.

Some leaves have special modifications. For example, water storage leaves are found in many plants living in dry conditions (e.g. cacti). In other plants the leaves are modified into tendrils for climbing (e.g. pea) while in some the leaves have become spines, e.g. gorse.

leaf

terminal outgrowths of plant foliage, usually flat green blades that conduct the plants' photosynthesis. Of the foliage it is much the most nutritious part and is often incorporated into special feeds, e.g. lucerne leaf meal.

leaf intestinal impaction
impaction of the cecum and colon in horses with access to indigestible tree leaves.
leaf mustard
brassicajuncea.

Patient discussion about leaf

Q. What happens if you leave appendicitis alone? I have symptoms of appendicitis, but I don't want to go to the hospital. What should I do? and what could happen?

A. If you have symptoms of appendicitis you should see a doctor immediately, because the major complication of an untreated appendix is rupture and infection of the entire abdomen, that can lead to generalized sepsis.

Q. Any ideas about why she leaves some food in her plate. Thank you for your visit. My daughter is 8 years old and she is a poor eater. She never wants to eat dinner even if it's her favorite dish. And then she picks it and an hour later she says that she feels hungry. She never completes her plate, always leaving a bit, no matter what we feed her. Should she be forced to eat dinner and if she doesn't, have only the dinner to eat later? Any ideas about why she leaves some food in her plate?

A. She trusts her mom. The most common reason to be like this is she knows that she will get something to eat later from her dear mom. While she shouldn't be forced to eat, she should learn that her main meal in the evening will be served at the dinner time.
Some other things that you might do to help deal with your picky eater include:
• Make sure that she isn't eating a big snack after school or filling up on juice, soda, or even milk before dinner.
• Offer her smaller portions so that there isn't as much left over on her plate.
• Don’t offer bribes or rewards for eating.
• Never talk about dieting, calories, and such, especially if she or other family members have problems with being overweight. Instead, talk about eating healthy.
• Consider not offering her anything else to eat if she misses dinner or just offer a small, healthy snack.

Mainly a visit to your Pediatrician to monitor her growth, development and eating habits would also be a good idea. Hug her now!

Q. What makes me worried that it’s really painful but might not be able to leave all of a sudden. Doctor diagnosed my son with peanut allergy after some tests. His body generates rashes and these eruptions are painful for him. I thought it big to be eczema as I heard about it, but now it is diagnosed and I am not able to decide how to avoid him of not giving peanuts and to keep him away as he likes them. Once near to me I can try to avoid to some extent, but once away to school or in playing with friends he does eat them regularly. What makes me worried that it’s really painful but might not be able to leave all of a sudden.

A. My friend’s brother does have the experience of peanut allergy. These peanuts are nutritious, but its allergy is awful. He has a clear understanding of this and avoids eating them. I too have found that he followed strict guidelines for not eating them when it was diagnosed for him. The best thing is to create some other or new foodstuff taste for him which might help him be consumed an alternative for nuts for some times and then provide with peanuts for him to regain his remembrances for the culprit he consumes. It needs to be done under your care for long time till he develops the inhibitions for nuts. You must also remember to memorize some medicine names and symptoms, so, if consumed unknowingly can explain what it is to anyone responsible nearby.

More discussions about leaf
References in classic literature ?
Virginia Maxon, idling beneath the leafy shade of the tropical foliage, became presently aware that she had wandered farther from the campong than she had intended.
Look 'm that fella," Binu Charley interrupted, brushing aside the leafy wall of the run-way and exposing a bow so massive that no one bushman could have bent it.
The fall through leafy branches and the dizzy heights; the snakes that struck at me as I dodged and leaped away in chattering flight; the wild dogs that hunted me across the open spaces to the timber--these were terrors concrete and actual, happenings and not imaginings, things of the living flesh and of sweat and blood.
The country around them was charming, yet in the pretty fields of wild-flowers and groves of leafy trees were no houses whatever, or sign of any inhabitants.
whispered Rose, as the little troop marched slowly by to the muffled roll of the drums, every flag and sword held low, all the little heads uncovered, and the childish faces very sober as the leafy shadows flickered over them.
I felt this now as I lay on my leafy couch in a corner of the room next to the chimney and permitted my fire to die out.
That takes us away from the green, leafy woods and dells of England to the wild, rocky coast of Scotland.
Just to have seen him there, lolling upon the swaying bough of the jungle-forest giant, his brown skin mottled by the brilliant equatorial sunlight which percolated through the leafy canopy of green above him, his clean-limbed body relaxed in graceful ease, his shapely head partly turned in contemplative absorption and his intelligent, gray eyes dreamily devouring the object of their devotion, you would have thought him the reincarnation of some demigod of old.
He paused a moment, looking at them; then, with a sorrowful grimace, he turned and faded away into the labyrinth of leafy boughs and festooned moss out of which he had come.
They were building a cage in the trail and covering it with leafy branches.
When something thwarted him, his sole idea was to overcome it by brute strength and ferocity, and so now when he found his way blocked, he tore angrily into the leafy screen and an instant later found himself within a strange lair, his progress effectually blocked, notwithstanding his most violent efforts to forge ahead.
368 audits of leafy greens farms by trained and certified government inspectors were conducted from July 23, 2007 to December 31, 2007.