scholarly journals Survival of forest species of the caatinga in ciliary plantations in the state of Paraíba

2020 ◽  
Vol 5 (4) ◽  
pp. 2560-2570
Author(s):  
Maria José de Holanda Leite ◽  
Maria do Carmo Learth Cunha ◽  
Rafael Rodolfo de Melo ◽  
Maria José Martins Fausto Almeida
Keyword(s):  
Rural Communities ◽  
Native Species ◽  
Riparian Forest ◽  
High Water ◽  
Species Group ◽  
High Water Content ◽  
Ecological Group ◽  
Forest Species ◽  
Adverse Conditions ◽  
Periodic Flooding

ABSTRACT: Riparian forests have peculiar characteristics in relation to architecture and flowering, which are intrinsically linked to the high water content of the soil and the air where they develop due to both the superficiality of the water table and periodic flooding. The aim of this research was to assess the survival or establishment of seedlings in the field through the collection of survival information in order to verify which species group(s) is most feasible for recovering of riparian forest in Caatinga areas. The riparian plantations were conducted in three rural communities from March to April, at the Riacho Trapiá, Rio Espinharas and Rio da Cruz rivers, municipality of Maturéia-PB, respectively for three years (2003, 2004 and 2005). Twenty-two native species were used, covering six pioneers, eight secondary, five climaxes and three of undetermined ecological group. The results showed that the pioneer and secondary species had better survival performance in the areas of riparian stand plantations, this may have occurred because they had the capacity to adapt in places with adverse conditions, which demonstrates their indication for recovering of riparian forest. KEYWORDS: northeast, revegetation, semi-arid.

scholarly journals Survival of Forest Species of the Caatinga in Ciliary Plantations in the State of Paraíba, Brazil

2020 ◽  
pp. 46-51
Author(s):  
Maria José de Holanda Leite ◽  
Maria do Carmo Learth Cunha ◽  
Rafael Rodolfo Melo ◽  
Maria José Martins Fausto Almeida
Keyword(s):  
Rural Communities ◽  
Native Species ◽  
Riparian Forest ◽  
High Water ◽  
Species Group ◽  
High Water Content ◽  
Ecological Group ◽  
Forest Species ◽  
Adverse Conditions ◽  
Periodic Flooding

Riparian forests have peculiar characteristics in relation to architecture and flowering, which are intrinsically linked to the high water content of the soil and the air where they develop due to both the superficiality of the water table and periodic flooding. The aim of this research was to assess the survival or establishment of seedlings in the field through the collection of survival information in order to verify which species group(s) is most feasible for recovering of riparian forest in Caatinga areas. The riparian plantations were conducted in three rural communities from March to April, at the Riacho Trapiá, Rio Espinharas and Rio da Cruz rivers, municipality of Maturéia-PB, respectively for three years (2003, 2004 and 2005). Twenty-two native species were used, covering six pioneers, eight secondary, five climaxes and three of undetermined ecological group. The results showed that the pioneer and secondary species had better survival performance in the areas of riparian stand plantations, this may have occurred because they had the capacity to adapt in places with adverse conditions, which demonstrates their indication for recovering of riparian forest.

scholarly journals Desiccation of Pachira aquatica Aubl. Seeds

2018 ◽  
Vol 10 (11) ◽  
pp. 553
Author(s):  
Amanda Araújo Lima ◽  
Edilma Pereira Gonçalves ◽  
Jeandson Silva Viana ◽  
Priscila Cordeiro Souto ◽  
Débora Teresa da Rocha Gomes Ferreira ◽  
...  
Keyword(s):  
Water Content ◽  
Native Species ◽  
Seed Quality ◽  
Germination Rate ◽  
High Water ◽  
High Water Content ◽  
Small Reduction ◽  
Drying Temperature ◽  
Before And After ◽  
Physiological Quality

The conservation of seed quality during storage is important to perform the maintenance and conservation of germplasm banks. Several native species of Brazil are intolerant to desiccation to desirable levels for conservation during storage is necessary to develop specific technologies for their conservation. The objective of this research was to evaluate the physiological quality of Paquira aquatica seeds submitted to drying periods. The study was carried out using seeds of P. aquatica dried at a temperature of 35 ºC, the following exposure times: 0 (no drying), 24, 48, 72 and 96 hours. Before and after each period of drying samples for the evaluations, the data were submitted to analysis of variance and regressionat level of 5%. The seeds of P. aquatica were dispersed with very high water content and a small reduction in its physiological value agrees quality, allowing the seeds to characterize this as a recalcitrant species. The drying temperature is 35 ºC until the viable 24 hours after this period the water content of seed reduced from 55% to 43%, which was considered the critical level for desiccation of seeds of P. aquatica. Because it reduces the values of first count, germination, rate of germination and growth of seedlings.The drying temperature the 35 ºC until the viable 24 hours, whit small reduction in its physiological quality seed P. aquatica.

scholarly journals Potassium fertilization in the quality improvement and centesimal composition of pitaya

2020 ◽  
pp. 658
Author(s):  
Josimara Mendes Rabelo ◽  
Maria do Céu Monteiro da Cruz ◽  
Cíntia Gonçalves Sena ◽  
Lílian de Araújo Pantoja ◽  
Alexandre Soares dos Santos ◽  
...  
Keyword(s):  
Dry Matter ◽  
High Water ◽  
Quality Characteristics ◽  
Potassium Oxide ◽  
High Water Content ◽  
Market Prices ◽  
Adverse Conditions ◽  
Potassium Fertilization ◽  
Orchard Management ◽  
Hylocereus Undatus

Pitaya stands out in the market for presenting exotic appearance species, high water content, vitamins and minerals, low calories, and bioactive compounds that makes it attractive for consumption However, the composition of this fruit may change according from the place of cultivation, orchard management and harvesting season. Regarding orchards management, variations have been observed in the fact that the pitaya species are considered rustic, able of tolerating adverse conditions of low availability of water and nutrients, and mainly because lack information on fertilization. Thus, the research was carried out to evaluated the potassium fertilization in the quality and in the centesimal composition in pitayas of the species Hylocereus undatus and Hylocereus polyrhizus. The evaluations were carried out during two harvests, in pitayas harvested mature from plants that received different fertilizations. The fruits of the pitaya species reach larger sizes and better flavor with the potassium fertilization. The fruits centesimal composition is altered with the management of the fertilization of the orchards. The fruits produced by plants with higher availability of potassium oxide (K2O) present higher contents of dry matter, fiber, ashes, carbohydrates and energetic value and lower moisture content, allowing conservation for longer if stored properly. The increase of these constituents in the fruit pulp is related to the function of potassium (K) in the enzyme’s activation, which are fundamental in the metabolic processes and the transport of photoassimilates, evidencing their role in improving fruit quality characteristics. Orchards that are fertilized with potassium produce fruits with better composition and final quality, increasing the acceptance by consumers, size classification and market prices.

Features of spring feeding of sterlet of the middle course of the Northern Dvina river

2020 ◽  
pp. 8-17
Author(s):  
A. Bykov ◽  
D. Palatov ◽  
I. Studenov ◽  
D. Chupov
Keyword(s):  
Benthic Communities ◽  
High Water ◽  
Food Composition ◽  
Fish Growth ◽  
High Water Content ◽  
Feeding Intensity ◽  
Biting Midges ◽  
Size Groups ◽  
Main Components ◽  
A Minor

The article provides information about the features of spring feeding of sterlet in the spawning grounds of the middle course of the Northern Dvina river in may 2019. The main and secondary groups of forage objects in the diet of this species of sturgeon are characterized. The article considers the variability of the sterlet food composition with an increase in the size of fish from 30 to 60 cm. In the process of fish growth in the diet of the Severodvinsk sterlet, the main components in terms of occurrence and mass in all size groups are the larvae of Brooks and chironomids. A minor occurrence was the larvae of midges, biting midges, stoneflies, mayflies and small clams. To random and seasonal food are the larvae of water bugs, butterflies, flies, beetles and eggs of other fish. The feeding intensity of the smaller sterlet (30–40 cm) was significantly higher than that of the fish in the size groups 40–50 and 50–60 cm. Fundamental changes in the diet of the Severodvinsk sterlet for the main food objects for more than sixty years of observations have not been established. During periods of high water content of the Northern Dvina due to seasonal changes in the structure of benthic communities, the value of Brooks in the diet of sterlet increases and the proportion of chironomids decreases.

Hydrogels as Antibacterial Biomaterials

2018 ◽  
Vol 24 (8) ◽  
pp. 843-854 ◽  
Author(s):  
Weiguo Xu ◽  
Shujun Dong ◽  
Yuping Han ◽  
Shuqiang Li ◽  
Yang Liu
Keyword(s):  
Mechanical Properties ◽  
Drug Delivery ◽  
Tissue Engineering ◽  
Water Content ◽  
Oxygen Permeability ◽  
Structural Diversity ◽  
High Water ◽  
Clinical Applications ◽  
High Water Content ◽  
Biomedical Field

Hydrogels, as a class of materials for tissue engineering and drug delivery, have high water content and solid-like mechanical properties. Currently, hydrogels with an antibacterial function are a research hotspot in biomedical field. Many advanced antibacterial hydrogels have been developed, each possessing unique qualities, namely high water swellability, high oxygen permeability, improved biocompatibility, ease of loading and releasing drugs and structural diversity. In this article, an overview is provided on the preparation and applications of various antibacterial hydrogels. Furthermore, the prospects in biomedical researches and clinical applications are predicted.

Microwave-Induced Thermoacoustic Imaging for Embedded Explosives Detection in High-Water Content Medium

2019 ◽  
Vol 67 (7) ◽  
pp. 4803-4810 ◽  
Author(s):  
Xiong Wang ◽  
Tao Qin ◽  
Yexian Qin ◽  
Ahmed H. Abdelrahman ◽  
Russell S. Witte ◽  
...  
Keyword(s):  
Water Content ◽  
High Water ◽  
Explosives Detection ◽  
High Water Content ◽  
Thermoacoustic Imaging

scholarly journals Deep mantle melting, global water circulation and its implications for the stability of the ocean mass

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Shun-ichiro Karato ◽  
Bijaya Karki ◽  
Jeffrey Park
Keyword(s):  
Phase Transformation ◽  
Water Content ◽  
Sea Level ◽  
High Water ◽  
Water Circulation ◽  
Mantle Melting ◽  
High Water Content ◽  
Mineral Physics ◽  
Deep Mantle ◽  
Global Water

AbstractOceans on Earth are present as a result of dynamic equilibrium between degassing and regassing through the interaction with Earth’s interior. We review mineral physics, geophysical, and geochemical studies related to the global water circulation and conclude that the water content has a peak in the mantle transition zone (MTZ) with a value of 0.1–1 wt% (with large regional variations). When water-rich MTZ materials are transported out of the MTZ, partial melting occurs. Vertical direction of melt migration is determined by the density contrast between the melts and coexisting minerals. Because a density change associated with a phase transformation occurs sharply for a solid but more gradually for a melt, melts formed above the phase transformation depth are generally heavier than solids, whereas melts formed below the transformation depth are lighter than solids. Consequently, hydrous melts formed either above or below the MTZ return to the MTZ, maintaining its high water content. However, the MTZ water content cannot increase without limit. The melt-solid density contrast above the 410 km depends on the temperature. In cooler regions, melting will occur only in the presence of very water-rich materials. Melts produced in these regions have high water content and hence can be buoyant above the 410 km, removing water from the MTZ. Consequently, cooler regions of melting act as a water valve to maintain the water content of the MTZ near its threshold level (~ 0.1–1.0 wt%). Mass-balance considerations explain the observed near-constant sea-level despite large fluctuations over Earth history. Observations suggesting deep-mantle melting are reviewed including the presence of low-velocity anomalies just above and below the MTZ and geochemical evidence for hydrous melts formed in the MTZ. However, the interpretation of long-term sea-level change and the role of deep mantle melting in the global water circulation are non-unique and alternative models are reviewed. Possible future directions of studies on the global water circulation are proposed including geodynamic modeling, mineral physics and observational studies, and studies integrating results from different disciplines.

Sign in / Sign up

Export Citation Format

Share Document