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Dive into the research topics where Constantin Toma is active.

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Featured researches published by Constantin Toma.


Archive | 2014

Halophytes : an integrative anatomical study

Marius-Nicusor Grigore; Lacramioara Ivanescu; Constantin Toma

Introduction PART I: General Considerations on Halophytes Halophytes definition and classification Halophytes and their habitats. Finding a place within plant ecological classes General morphological and anatomical adaptations in halophytes Halophytes and salt stress. Histo-anatomical features in halophytes: formative effect, adaptation or a simple response to an intensely abiotic factor? PART II: An Integrative Anatomical Study of Halophytes: Anatomical Structure in Different Family Species Material and Methods Caryophyllaceae Chenopodiaceae (Amaranthaceae) Polygonaceae Plumbaginaceae Fabaceae Lythraceae Apiaceae Frankeniaceae Brassicaceae Primulaceae Plantaginaceae Asteraceae Juncaginaceae Cymodoceaceae Iridaceae Juncaceae Cyperaceae Poaceae Part III: Conclusions An Overall View on Halophytes Adaptations and Their Ecological Significance.


Archive | 2017

Tracheoidioblasts (Spiral Cells) and Stereides (Spicular Cells)

Marius Nicușor Grigore; Constantin Toma

These structures are found in a few halophytic articulated species from Chenopodiaceae (Salicornia, Arthrocnemum, Sarcocornia). While their terminology has been used with certain confusion during time, their appearance, localisation and functions represented a matter of debate. Nowadays, it is accepted that they are located between palisade cells of succulent articulated segments; their possible roles in the adaptive ecological frame are discussed in detail.


Archive | 2017

Successive (Additional) Cambia

Marius-Nicușor Grigore; Constantin Toma

Successive cambia phenomenon (supernumerary or additional cambia)—considered by some authors as a structural anomaly—represents an intriguing anatomical feature found in halophytes. It is here treated as a reality found in many halophytic species that have been investigated—especially Chenopodiaceae species. A pivotal question is if this phenomenon could have an ecological and adaptive significance in relation to salinity factor. A hypothesis in this regard has been proposed related to the possibility that anatomical products derived from the activity of successive cambia to be involved in the enhancing salinity tolerance at structural level.


Archive | 2017

Definition and Classification of Halophytes

Marius-Nicușor Grigore; Constantin Toma

At this moment, there is a plethora of definitions that are attributed to halophytes; due to their taxonomical and ecological complexity, there is no consensus on a unique definition of a halophyte. This chapter summarizes interesting definitions and classifications of halophytes—many of them less known to the large mass of readers. These are grouped around major conceptual approaches, such as: halophytes and glycophytes, and obligatory halophytes. Special attention is given to ecological definitions that can contribute to a better and natural understanding of halophytes-saline environments interrelationships.


Procedia. Economics and finance | 2015

Harnessing Financial Information in Investors Decissions: Accrual Accounting versus Cash Accounting☆

Constantin Toma; Mihai Carp; Ioan Bogdan Robu

Abstract This study aims to analyze the influence of the value added of the information developed according on the two main accounting systems for investment decision making, with direct impact on the market capitalization of the listed companies. To obtain the research results, in the study were analyzed specific financial information, collected for a sample of 65 Romanian listed companies on the Bucharest Stock Exchange, between 2011 and 2013. For data analysis were used econometric models from the literature, based on the multiple regression analysis and adapted to the research objectives. At the level of the study, there was estimated and tested the influence of the information attained based on the use of cash accounting (quantified through the cash flow from operations, cash flow from investing and cash flow from financing) and based on the use of accrual accounting (quantified through the variation of the operating and net income) on the capital gains yield of listed companies. Research results show a growth of the value relevance of the information obtained based on the use of accrual accounting compared to the ones obtained as a result of cash accounting use, in the case of Romanian listed companies.


Archive | 2014

General Morphological and Anatomical Adaptations in Halophytes

Marius-Nicusor Grigore; Lacramioara Ivanescu; Constantin Toma

This chapter reviews the major morphological and anatomical adaptations in halophytes. Many of them are to be found in investigated species, included in this study.


Archive | 2014

Halophytes and Their Habitats: Finding a Place Within Plant Ecological Classes

Marius-Nicusor Grigore; Lacramioara Ivanescu; Constantin Toma

This chapter discusses the relationship between halophytes and their environment as a pivotal point in halophyte biology. According to the nature of their adaptations, the position of halophytes within the xerophytes group is proposed and discussed.


Archive | 2014

Halophytes and Salt Stress: Histo-Anatomical Features in Halophytes—Formative Effect, Adaptation or a Simple Response to an Intensely Abiotic Factor?

Marius-Nicusor Grigore; Lacramioara Ivanescu; Constantin Toma

This chapter discusses the relation between halophytes and salt stress and especially inquires if halophytes, as salt-loving plants, can in fact be affected by salt stress as are other plants—glycophytes.


Archive | 2014

An Overall View on Halophytes Adaptations and Their Ecological Significance

Marius-Nicusor Grigore; Lacramioara Ivanescu; Constantin Toma

Based on histo-anatomical investigations of vegetative organs of halophyte species, this chapter offers several general conclusions.


Archive | 2014

Halophyte Definitions and Classifications

Marius-Nicusor Grigore; Lacramioara Ivanescu; Constantin Toma

Although recognized for hundreds of years, halophyte definitions and classifications still represent a matter of debate. This chapter tries to review and comment on several definitions of halophytes, taking into considerations different aspects related to halophyte biology. A system to harmonize the major classifications from Romanian literature is also proposed in this chapter.

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Lacramioara Ivanescu

Alexandru Ioan Cuza University

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Marius-Nicusor Grigore

Alexandru Ioan Cuza University

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Zenovia Olteanu

Alexandru Ioan Cuza University

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Marius Nicusor Grigore

Alexandru Ioan Cuza University

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Marius-Nicușor Grigore

Alexandru Ioan Cuza University

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Monica Boscaiu

Polytechnic University of Valencia

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Mihai Carp

Alexandru Ioan Cuza University

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Dumitru Cojocaru

Alexandru Ioan Cuza University

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