Absorption de l'eau atmosphérique par la partie aérienne d'un chaméphyte de la Tunisie présaharienne : l’Anthyllis henoniana (Fabaceae)

1994 ◽  
Vol 72 (8) ◽  
pp. 1222-1227 ◽  
Author(s):  
Jean-Marc Ourcival ◽  
André Berger ◽  
Édouard Le Floc'h

Measurements of predawn water potential made in the presaharian Tunisia (Médenine) on A. henoniana suggest that this species is able to absorb directly atmospheric water through its leaves and (or) stems. Measurements of water potential were also made on several plants in controlled conditions. Cross sections of stems of various ages and of leaves were examined. There was a good correlation between the thickness of the cortical parenchymatous tissue in leaves and young stems and the ability of a plant to maintain a less negative water potential in conditions of high atmospheric humidity. The water is apparently taken up by the vascular system. This ability would allow A. henoniana to benefit from the many dew days observed in its area of distribution and would improve its water balance. Key words: Anthyllis henoniana, dew, water potential, water absorption, water balance.

1991 ◽  
Vol 69 (3) ◽  
pp. 656-670 ◽  
Author(s):  
Thompson Demetrio Pizzolato

The vascular system of the sessile, fertile spikelet of Sorghum was reconstructed from serial transverse sections. The vascular system is a composite of the basipetal extensions of the traces from the appendages on the rachilla. The rachilla immediately above the glumes consists of an outer and an inner series of these vascular extensions. The basipetal continuations of the median traces of the sterile and fertile lemmas, and of the traces from the stamens comprise the inner series. The outer series consists of the continuations of the many lodicule traces and of vascular bundles descending from the posterior of the pistil. The component of the vascular system related to the pistil is a plexus of xylem and phloem in the form of a hollow cylinder traversed by a large vascular bundle that is the basipetal continuation of the stylar bundles. Bundles from the anterior of the pistil merge with the hollow cylinder at its anterior. Several collateral bundles from the placenta merge with the hollow cylinder at its posterior. Distal portions of these placental bundles supply the short chalaza of the ovule but do not enter it. The vascular system of the fertile spikelet of Sorghum is typical of the Panicoideae, and is useful in distinguishing the Panicoideae from the other subfamilies of grasses. Key words: Sorghum, spikelet, floret, vascular system.


2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Alwi Musa Muzaiyin

Trade is a form of business that is run by many people around the world, ranging from trading various kinds of daily necessities or primary needs, to selling the need for luxury goods for human satisfaction. For that, to overcome the many needs of life, they try to outsmart them buy products that are useful, economical and efficient. One of the markets they aim at is the second-hand market or the so-called trashy market. As for a trader at a trashy market, they aim to sell in the used goods market with a variety of reasons. These reasons include; first, because it is indeed to fulfill their needs. Second, the capital needed to trade at trashy markets is much smaller than opening a business where the products come from new goods. Third, used goods are easily available and easily sold to buyer. Here the researcher will discuss the behavior of Muslim traders in a review of Islamic business ethics (the case in the Jagalan Kediri Trashy Market). Kediri Jagalan Trashy Market is central to the sale of used goods in the city of Kediri. Where every day there are more than 300 used merchants who trade in the market. The focus of this research is how the behavior of Muslim traders in the Jagalan Kediri Trashy Market in general. Then, from the large number of traders, of course not all traders have behavior in accordance with Islamic business ethics, as well as traders who are in accordance with the rules of Islamic business ethics. This study aims to determine how the behavior of Muslim traders in the Jagalan Kediri Trashy Market in buying and selling transactions and to find out how the behavior of Muslim traders in the Jagalan Kediri Trashy Market in reviewing Islamic business ethics. Key Words: Trade, loak market, Islamic business


Mediaevistik ◽  
2018 ◽  
Vol 31 (1) ◽  
pp. 366-366
Author(s):  
Albrecht Classen

Eddic poetry constitutes one of the most important genres in Old Norse or Scandinavian literature and has been studied since the earliest time of modern-day philology. The progress we have made in that field is impressive, considering the many excellent editions and translations, not to mention the countless critical studies in monographs and articles. Nevertheless, there is always a great need to revisit, to summarize, to review, and to digest the knowledge gained so far. The present handbook intends to address all those goals and does so, to spell it out right away, exceedingly well. But in contrast to traditional concepts, the individual contributions constitute fully developed critical article, each with a specialized topic elucidating it as comprehensively as possible, and concluding with a section of notes. Those are kept very brief, but the volume rounds it all off with an inclusive, comprehensive bibliography. And there is also a very useful index at the end. At the beginning, we find, following the table of contents, a list of the contributors, unfortunately without emails, a list of translations and abbreviations of the titles of Eddic poems in the Codex Regius and then elsewhere, and a very insightful and pleasant introduction by Carolyne Larrington. She briefly introduces the genre and then summarizes the essential points made by the individual authors. The entire volume is based on the Eddic Network established by the three editors in 2012, and on two workshops held at St. John’s College, Oxford in 2013 and 2014.


Author(s):  
John Hunsley ◽  
Eric J. Mash

Evidence-based assessment relies on research and theory to inform the selection of constructs to be assessed for a specific assessment purpose, the methods and measures to be used in the assessment, and the manner in which the assessment process unfolds. An evidence-based approach to clinical assessment necessitates the recognition that, even when evidence-based instruments are used, the assessment process is a decision-making task in which hypotheses must be iteratively formulated and tested. In this chapter, we review (a) the progress that has been made in developing an evidence-based approach to clinical assessment in the past decade and (b) the many challenges that lie ahead if clinical assessment is to be truly evidence-based.


1956 ◽  
Vol 21 ◽  
pp. 156-159
Author(s):  
O. G. S. Crawford

The prudent contributor to a Festschrift will select some subject about which he thinks he knows as much as the professor who is to receive it. That is peculiarly difficult here because of the vast range of Professor Childe's knowledge, both in time and space, far exceeding the present contributor's. This Note is offered as a grateful tribute from one of the many who have been intellectually enriched by his writings and encouraged by his devotion to scholarship. It is little more than an amplification and criticism of the Abbé Breuil's classic Presidential Address to the Prehistoric Society of East Anglia, delivered in 1934; but on the strength of observations made in August and September, 1955, I have come to different conclusions.The Abbé Breuil detected five successive techniques, all of them found on the stones of the Boyne Tombs:(1) Incised thin lines (pl. XIX, B).(2) Picked grooves left rough (pl. XVIII).(3, a) Picked grooves afterwards rubbed smooth; in this and the preceding group ‘it is invariably the line (groove) itself on which the pattern depends, which gives and is the design’.(3, b) Picked areas which ‘only define the limits of the pattern, the surface, left in relief by the cutting down of the background, constituting the actual design’ (pl. xx, B).(4) Rectilinear patterns where also the pattern is residual, consisting of raised ribs, forming triangles or lozenges, left standing by picking away the surrounding surface (pl. xx, A).


1991 ◽  
Vol 37 (9) ◽  
pp. 713-715 ◽  
Author(s):  
Vijay M. Chauthaiwale ◽  
Pranav R. Vyas ◽  
Vasanti V. Deshpande

A PEG-mediated transformation system for Chainia (NCL 82-5-1) was develolped using a broad host range Streptomyces vector, pIJ702. Protoplasts prepared from Chainia (NCL 82-5-1) were regenerated with 5% efficiency. Transformation of the protoplasts with pIJ702 gave 10–20 transformants/μg DNA. The low efficiency of transformation is attributed to a restriction system in Chainia; this could be inhibited by treating the protoplasts at 42 °C for 10 min just before transformation. The yield of transformants increased 100-fold when pIJ702 was modified by passage in Chainia. Because the plasmid replicon was functional in Chainia and the modified plasmid was stably maintained, the transformation system should be useful for self-cloning in Chainia NCL 82-5-1 of the many commercially important enzymes this strain is known to produce. Key words: Chainia, transformation, Streptomyces, pIJ702 restriction modification, heat attenuation.


2019 ◽  
Vol 15 (S367) ◽  
pp. 515-517
Author(s):  
Debra Meloy Elmegreen

AbstractThis symposium has highlighted key first steps made in addressing many goals of the IAU Strategic Plan for 2020–2030. Presentations on initiatives regarding education, with applications to development, outreach, equity, inclusion, big data, and heritage, are briefly summarized here. The many projects underway for the public, for students, for teachers, and for astronomers doing astronomy education research provide a foundation for future collaborative efforts, both regionally and globally.


2006 ◽  
Vol 31 (1) ◽  
pp. 84-89
Author(s):  
Jorge Gavidia ◽  
Annalisa Crivellari

A study conducted in Central America in 2003 shows that in the aftermath of Hurricane Mitch noticeable progress was made in introducing new legislation for disaster management, understood as covering the whole cycle from prevention, preparedness and relief, to reconstruction. The new legislation includes civil defence or disaster management laws and regulations to improve their effectiveness in responding to the threat of natural disasters. A similar situation can be observed in other countries like Cuba and the Dominican Republic. The study looks into existing urban and municipal laws, regulations and planning guidelines to assess the extent to which they respond to vulnerability reduction criteria. This paper focuses on aspects of prevention and risk reduction. An attempt was made to look into the complementarities and gaps between the two sets of regulations for disaster management and for municipal/urban management. It is found that despite the many elements of good practice included in them, the links between these instruments are weak or absent on issues ranging from planning to the actual supervision of interventions on the built environment. Thus, the main elements of the edifice were there, but they did not constitute a solid, interconnected, structure, therefore, bound to fail under the loads imposed by rapid urbanisation, speculation, emergencies and weak governance structures. Institutions are often left to fend themselves in discharging their tasks. Without a coherent normative framework, and the capacity to apply it, their work is primarily driven by institutional initiative, leading to problems of underperformance, overlaps, gaps, and non-constructive competition. Thus, the institutional setup and normative framework become important factors in increasing vulnerability, as real as a building with the wrong foundations. The article reviews the mentioned aspects drawing from the experience in Central America, Cuba and Dominican Republic.


2008 ◽  
Vol 1 (2) ◽  
pp. 113-120 ◽  
Author(s):  
A. C. Marques ◽  
J. L. Akasaki ◽  
A. P. M. Trigo ◽  
M. L. Marques

In this work it was evaluated the influence tire rubber addition in mortars in order to replace part of the sand (12% by volume). It was also intended to verify if the tire rubber treatment with NaOH saturated aqueous solution causes interference on the mechanical properties of the mixture. Compressive strength, splitting tensile strength, water absorption, modulus of elasticity, and flow test were made in specimens of 5cmx10cm and the tests were carried out to 7, 28, 56, 90, and 180 days. The results show reduction on mechanical properties values after addition of tire rubber and decrease of the workability. It was also observed that the tire rubber treatment does not cause any alteration on the results compared to the rubber without treatment.


Sign in / Sign up

Export Citation Format

Share Document