ANOMALOUS SECONDARY GROWTH IN LIANAS OF THE BIGNONIACEAE IS CORRELATED WITH THE VASCULAR PATTERN

1981 ◽  
Vol 68 (1) ◽  
pp. 142-144 ◽  
Author(s):  
David R. Dobbins
Keyword(s):  
Secondary Growth ◽  
Vascular Pattern

Studies on the anomalous cambial activity in Doxantha unguis-cati (Bignoniaceae). I. Development of the vascular pattern

1969 ◽  
Vol 47 (12) ◽  
pp. 2101-2106 ◽  
Author(s):  
David R. Dobbins
Keyword(s):  
Shoot Apex ◽  
Vascular System ◽  
Secondary Growth ◽  
Cambial Activity ◽  
Vascular Pattern ◽  
Internode Elongation ◽  
Primary Xylem ◽  
The Third ◽  
The Relationship ◽  
Cell Zone

The development of the vascular pattern was studied in Doxantha unguis-cati as a prelude to correlating the vascular system to the anomalous cambial activity observed in the mature stem. The shoot apex of this liana has a two-layered mantle covering a corpus of a mother cell zone and a flanking meristem. Just below the shoot apex a cylinder of procambium differentiates. The first primary phloem can be recognized in the third internode and the first primary xylem in the fourth or fifth internodes. As the internodes elongate so do the procambial cells. The cells of the pith, on the other hand, are shorter than the procambial cells and accommodate to the extensive internode elongation by cell division. The vascular system of the young shoot includes not only bundles, but also individual strands of phloem. The stem has multilacunar nodes from which five bundles and two phloem strands depart into each of the oppositely paired leaves. Within the stem there are four continuous bundles to which all other bundles connect. The location of these four bundles corresponds to the formation of the characteristic anomalous cambium observed in the secondary growth of the older stem. The relationship between the vascular pattern of D. unguis-cati to other vascular patterns is also discussed.

THE ANATOMY OF HAUSTORIA AND RELATED ORGANS OF GAIADENDRON (LORANTHACEAE)

1965 ◽  
Vol 43 (6) ◽  
pp. 687-694 ◽  
Author(s):  
Job Kuijt
Keyword(s):  
Secondary Growth ◽  
Root Hairs ◽  
Root Cap ◽  
Vascular Pattern ◽  
Anatomical Features ◽  
Distinct Root ◽  
Internal Organization ◽  
Close Relationship ◽  
Relationship Of ◽  
Secondary Roots

The internal organization of the radicle, tuber, secondary roots, and haustoria is described for Gaiadendron punctatum (Ruíz & Pavon) G. Don. The root is characterized by a distinct root cap, an endodermis, and a tetrarch vascular pattern which is to some degree perpetuated after secondary growth sets in. Root hairs are absent from radicle and secondary roots. Haustoria are of the santalaceous type although a "gland" has not yet been found. Anatomical features confirm a close relationship of the genus with Atkinsonia and Nuytsia and emphasize the primitive position of these three genera within Loranthaceae–Loranthoideae.

MRI Evaluation of the Vascular Pattern in Intracranial Meningioma

1994 ◽  
Vol 30 (2) ◽  
pp. 225
Author(s):  
Mi Hye Kim ◽  
Kyung Sub Shinn ◽  
Hyo Sun Choi ◽  
Kyu Ho Choi ◽  
Il Gwon Yang ◽  
...  
Keyword(s):  
Intracranial Meningioma ◽  
Vascular Pattern ◽  
Mri Evaluation

Deposition time dependent study of structural and optical properties of PbS thin films grown by CBD method

2020 ◽  
Vol 13 ◽  
Author(s):  
Minakshi Chaudhary ◽  
Yogesh Hase ◽  
Ashwini Punde ◽  
Pratibha Shinde ◽  
Ashish Waghmare ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Deposition Time ◽  
Secondary Growth ◽  
Cost Effective ◽  
Xrd Analysis ◽  
Structural Morphology ◽  
Glass Substrates ◽  
Cbd Method

: Thin films of PbS were prepared onto glass substrates by using a simple and cost effective CBD method. Influence of deposition time on structural, morphology and optical properties have been investigated systematically. The XRD analysis revealed that PbS films are polycrystalline with preferred orientation in (200) direction. Enhancement in crystallinity and PbS crystallite size has been observed with increase in deposition time. Formation of single phase PbS thin films has been further confirmed by Raman spectroscopy. The surface morphology analysis revealed the formation of prismatic and pebble-like PbS particles and with increase in deposition time these PbS particles are separated from each other without secondary growth. The data obtained from the EDX spectra shows the formation of high-quality but slightly sulfur rich PbS thin films over the entire range of deposition time studied. All films show increase in absorption with increase in deposition time and a strong absorption in the visible and sub-band gap regime of NIR range of the spectrum with red shift in band edge. The optical band gap shows decreasing trend, as deposition time increases but it is higher than the band gap of bulk PbS.

Hymenachne acutigluma (Steud.) Gilliland in GBS 20:314 - An exceptionally important perennial grass for anatomy and indigenous practice.

2016 ◽  
Vol 5 (04) ◽  
pp. 4958
Author(s):  
Dulal De
Keyword(s):  
Perennial Grass ◽  
Secondary Growth ◽  
Grass Species ◽  
Stem Anatomy

Hymenachne acutigluma (Steud.) Gilliland, a robust rhizomatous perennial grass spreads on moist and swampy land and also floating in water. Being a grass species, they do not have any cambium for secondary growth. A peculiarity in stem anatomy especially the spongy pith of secondary tissues found in absence of the cambium. The origin and development of the parenchymatous pith tissues has been investigated in the present study. Economically this spongy pith is of very much potent for its high absorbing and filtering capacity and also used as a good fodder.

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