Transitional Pitting in Tracheids of Psilotum
نویسندگان
چکیده
منابع مشابه
Maturing Pine Tracheids
The cytoplasm of the interior of maturing pine tracheids is revealed by scanning electron microscopy as a lamellate and filamentous intravacuolar reticulum immersed in vacuolar sap. Formation of cytoplasmic spherules and the breakdown of the cytoplasmic reticulum initiate protoplast disintegration that terminates in tracheid maturation. The process is believed to involve vacuolar membrane trans...
متن کاملPitting oedema in hypothyroidism.
A 38 yrs old female admitted generalised swelling, puffiness of face and coarsening of features for six months. Examination revealed obesity (BMI 34.7 kg/m) with pitting pedal oedema (Figs, 1,2), normal JVP and delayed relaxation of ankle jerks. Rest of general physical examination and systemic examination was normal. On investigation, haemogram, urine examination, X-ray chest, echocardiography...
متن کاملThe State of Water in Ducts and Tracheids.
In preceding papers (3, 4, 5) I have discussed various aspects of the problem of the ascent of sap, of how water goes up a tree, and I wish in this paper to carry the discussion forward another step. First, however, I wish to express certain convictions, the fruits of observation, experiment: and reflection, under climatic conditions of considerable variety. I. If one conceive the living body -...
متن کاملSize and function in conifer tracheids and angiosperm vessels.
The wide size range of conifer tracheids and angiosperm vessels has important consequences for function. In both conduit types, bigger is better for conducting efficiency. The gain in efficiency with size is maximized by the control of conduit shape, which balances end-wall and lumen resistances. Although vessels are an order of magnitude longer than tracheids of the same diameter, they are not...
متن کاملThe transitional zone of the renal artery in cats
The length and structure of the transitional zone in the tunica media in the renal artery of adult male cats were investigated. In addition, the volume of the lumen and different layers in transitional and nontransitional zones in the right and left sides were also determined. Morphometrical, histological and stereological studies were performed on 16 renal arteries of 8 adult male cats. After ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals of the Missouri Botanical Garden
سال: 1936
ISSN: 0026-6493
DOI: 10.2307/2394191