scholarly journals Bioremediation Techniques for Polluted Environment: Concept, Advantages, Limitations, and Prospects

2021 ◽  
Author(s):  
Indu Sharma
Keyword(s):  
Environmental Factors ◽  
Anthropogenic Activities ◽  
Toxic Waste ◽  
Ex Situ ◽  
Management Tool ◽  
Main Principle ◽  
Polluted Environment ◽  
Site Characteristics ◽  
Chemical Wastes

Environmental pollution has been rising in the past few decades due to increased anthropogenic activities. Bioremediation is an attractive and successful cleaning technique to remove toxic waste from polluted environment. Bioremediation is highly involved in degradation, eradication, immobilization, or detoxification diverse chemical wastes and physical hazardous materials from the surrounding through the all-inclusive and action of microorganisms. The main principle is degrading and converting pollutants to less toxic forms. Bioremediation can be carried out ex-situ and in-situ, depending on several factors, which include but not limited to cost, site characteristics, type, and concentration of pollutants. Hence, appropriate bioremediation technique is selected. Additionally, the major methodologies to develop bioremediation are biostimulation, bioaugmentation, bioventing, biopiles, and bioattenuation provided the environmental factors that decide the completion of bioremediation. Bioremediation is the most effective, economical, eco-friendly management tool to manage the polluted environment. All bioremediation techniques have its own advantage and disadvantage because it has its own specific applications.

scholarly journals Overview on the Role of Advance Genomics in Conservation Biology of Endangered Species

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Suliman Khan ◽  
Ghulam Nabi ◽  
Muhammad Wajid Ullah ◽  
Muhammad Yousaf ◽  
Sehrish Manan ◽  
...  
Keyword(s):  
Animal Species ◽  
Anthropogenic Activities ◽  
Ex Situ ◽  
Endangered Plants ◽  
Monitoring Tools ◽  
Sixth Mass Extinction ◽  
Novice Readers ◽  
Hybridization And Introgression

In the recent era, due to tremendous advancement in industrialization, pollution and other anthropogenic activities have created a serious scenario for biota survival. It has been reported that present biota is entering a “sixth” mass extinction, because of chronic exposure to anthropogenic activities. Variousex situandin situmeasures have been adopted for conservation of threatened and endangered plants and animal species; however, these have been limited due to various discrepancies associated with them. Current advancement in molecular technologies, especially, genomics, is playing a very crucial role in biodiversity conservation. Advance genomics helps in identifying the segments of genome responsible for adaptation. It can also improve our understanding about microevolution through a better understanding of selection, mutation, assertive matting, and recombination. Advance genomics helps in identifying genes that are essential for fitness and ultimately for developing modern and fast monitoring tools for endangered biodiversity. This review article focuses on the applications of advanced genomics mainly demographic, adaptive genetic variations, inbreeding, hybridization and introgression, and disease susceptibilities, in the conservation of threatened biota. In short, it provides the fundamentals for novice readers and advancement in genomics for the experts working for the conservation of endangered plant and animal species.

scholarly journals Conservation status the genus Hampea (Malvaceae: Gossypieae) in Mexico

2018 ◽  
Vol 96 (3) ◽  
pp. 426 ◽  
Author(s):  
Robert W. Jones ◽  
M. Fernanda Cruz-Torres ◽  
Carlos López-González ◽  
Magdalena A. Duarte-Fernández
Keyword(s):  
Anthropogenic Activities ◽  
Conservation Status ◽  
Biological Data ◽  
Ex Situ ◽  
Southern Mexico ◽  
Risk Of Extinction ◽  
Made In ◽  
Eleven Species ◽  
Special Protection

<p><strong>Background. </strong>The genus <em>Hampea</em> (Malvaceae: Gossypieae) has 21 reported species and occurs in Mexico, Central America and Colombia. Mexico has eleven species, of which seven are endemic. <em>Hampea</em> is of special conservation interest because its members are wild relatives of cultivated cotton and several species are apparently threatened by anthropogenic activities.</p><p><strong>Questions: </strong>What is the conservation status of species of <em>Hampea </em>in Mexico?</p><p><strong>Study site and years of study:</strong> Observations were made in the field during 1991-1995, 2012 and 2016 in southern Mexico. Specimen data was obtained from the CONABIO data base and from national and international herbaria from 2014-2016.</p><p><strong>Methods.  </strong>The conservation status of species of <em>Hampea</em> in Mexico was evaluated using criteria given in the Methods of the Evaluation of Risk of Extinction of Plants (MER-Plantas) (NOM-059-SEMARNAT-2010).  The potential distribution was calculated using Maximum Entropy Algorithm and biological data for species were obtained from literature and field observations.</p><p><strong>Results. </strong>Seven species of the genus <em>Hampea </em>were considered to be in a category of risk under the MER-Plantas criteria. <em>Hampea montebellensis</em>, <em>H.</em> <em>breedlovei</em>, and <em>H.</em> <em>longipes </em>were categorized as “at Risk of Extinction,” (En Peligro de Extinción ); <em>H.</em> <em>latifolia </em>was categorized as “Threatened” (Amenazada) and <em>H. stipitata, H. mexicana, </em>and <em>H. tomentosa </em>categorized as “Subject to Special Protection” (<em>Sujeto a Protección Especial</em>).</p><strong>Conclusions.</strong> The species <em>H.</em> <em>breedlovei</em>, <em>H. montebellensis</em>, <em>H. longipes, H</em><em>.</em> <em>latifolia,</em> <em>H.</em> <em>mexicana, H. stipitata </em>and <em>H. tomentosa </em>need to be included in <em>ex situ </em>and <em>in situ </em>conservation programs.

scholarly journals INVENTARISASI TANAMAN BAMBU YANG TERDAPAT DI BALAI KEBUN RAYA BATURRADEN BANYUMAS JAWA TENGAH

2019 ◽  
Vol 2 (2) ◽  
pp. 59
Author(s):  
Melisa Oktaviani Sukma ◽  
Lianah Lianah
Keyword(s):  
Environmental Factors ◽  
Data Collection ◽  
Field Data ◽  
Botanical Garden ◽  
Ex Situ ◽  
Morphological Observation ◽  
Conservation Area ◽  
Mountain Area ◽  
Field Data Collection

<p><em>Baturraden Botanical Garden (KRB) is a conservation area both ex-situ and in-situ of various plants in the Slamet Mountain area. KRB plays a role in saving various types of plants, one of which is the type of bamboo in the area is rarely updated data. This study aims to inventory which is used in evaluating data on the number and types of bamboo that are in the KRB collection. The study uses descriptive qualitative methods which include exploration, morphological observation, and measurement of environmental factors. Based on field data collection, 40 bamboo specimens were obtained in 17 species, of which there were 7 specimens from 5 species that have not been identified while 33 other specimens belong to 12 different species and 8 genera. The eight clans are Bambusa, Cephalostachyu, Chimonobambus, Dinochloa, Gigantochloa, Melocanna, Schizostachyum, and Semiarundinaria. Schizostachyum caudatum Backer ex K. Hene, Melocanna baccifera (Roxb.) Kurz, Bambusa multiplex (Lour.) Raeusch. ex Schult. is the most commonly found bamboo. Morphological observations included roots, reeds, leaves and midribs. Environmental factors of the Baturraden Botanical Gardens in VAK III.B.I and VAK III.B.II meet the requirements for the growth and propagation of bamboo collections.</em></p>

scholarly journals Bioremediation Techniques for Soil Pollution: An Introduction

2021 ◽  
Author(s):  
Anita Verma
Keyword(s):  
Soil Pollution ◽  
Agricultural Practices ◽  
Polluted Soil ◽  
Ex Situ ◽  
Emerging Contaminant ◽  
Health Concerns ◽  
Site Characteristics ◽  
Polluted Sites ◽  
Rapid Industrialization

Environmental pollution has been on the rise in the past few decades owing to increased human activities on energy reservoirs, unsafe agricultural practices and rapid industrialization. Soil pollution is one of the major worry among all because soil contamination can harm the humans by consumption of food grown in polluted soil or it can cause infertility to soil and lower the productivity, Among the pollutants that are of environmental and public health concerns due to their toxicities are: heavy metals, nuclear wastes, pesticides, greenhouse gases, and hydrocarbons. So this chapter will include; Sources of soil pollution and remediation of polluted sites using biological means has proven effective and reliable due to its eco-friendly features. Bio-remediation can either be carried out ex situ or in situ, depending on several factors, which include site characteristics, type and concentration of pollutants. It also seen as a solution for emerging contaminant problems.

Heavy Metal Pollution and its Management

2016 ◽  
pp. 27-50 ◽  
Author(s):  
Ashok K. Rathoure
Keyword(s):  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Ex Situ ◽  
Management Tool ◽  
Contaminated Site ◽  
Anthropogenic Activity ◽  
Toxic Heavy Metals ◽  
Metabolic Degradation

Environmental degradation has become a major societal issue thanks to uncontrolled anthropogenic activity, besides natural factors. Entry of toxic heavy metals and minerals in human system mainly through contaminated water, food and air, leads to overt and insidious health problems. Heavy metal pollution, a global concern today, can be managed by using bioremediation, an eco-friendly alternative. Bioremediation is one of the most promising technological approaches to the problem of hazardous waste. It is a technology for removing pollution from environment, restoring contaminated site and preventing future pollution. Bioremediation can be performed in situ or ex situ. Microorganisms directly degrade contaminants rather than merely transferring them from one medium to another, employ metabolic degradation pathways and can be used in situ to minimize disturbance of the cleanup site. Hence, microorganisms can be effective, economical and non-disruptive tools for eliminating hazardous chemicals. Its advantage generally outweigh the disadvantage, therefore may be used as management tool.

Heavy Metal Pollution and its Management

2020 ◽  
pp. 1013-1036 ◽  
Author(s):  
Ashok K. Rathoure
Keyword(s):  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Ex Situ ◽  
Management Tool ◽  
Contaminated Site ◽  
Anthropogenic Activity ◽  
Toxic Heavy Metals ◽  
Metabolic Degradation

Environmental degradation has become a major societal issue thanks to uncontrolled anthropogenic activity, besides natural factors. Entry of toxic heavy metals and minerals in human system mainly through contaminated water, food and air, leads to overt and insidious health problems. Heavy metal pollution, a global concern today, can be managed by using bioremediation, an eco-friendly alternative. Bioremediation is one of the most promising technological approaches to the problem of hazardous waste. It is a technology for removing pollution from environment, restoring contaminated site and preventing future pollution. Bioremediation can be performed in situ or ex situ. Microorganisms directly degrade contaminants rather than merely transferring them from one medium to another, employ metabolic degradation pathways and can be used in situ to minimize disturbance of the cleanup site. Hence, microorganisms can be effective, economical and non-disruptive tools for eliminating hazardous chemicals. Its advantage generally outweigh the disadvantage, therefore may be used as management tool.

An in situ and ex situ TEM study of the formation of thin cobalt silicide films by molecular beam epitaxy on the silicon (100) surface

1988 ◽  
Vol 46 ◽  
pp. 884-885
Author(s):  
D. Loretto ◽  
J. M. Gibson ◽  
S. M. Yalisove ◽  
R. T. Tung
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Defect Density ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Ex Situ ◽  
Metal Base ◽  
In Situ Experiments ◽  
Potential Applications

The cobalt disilicide/silicon system has potential applications as a metal-base and as a permeable-base transistor. Although thin, low defect density, films of CoSi2 on Si(111) have been successfully grown, there are reasons to believe that Si(100)/CoSi2 may be better suited to the transmission of electrons at the silicon/silicide interface than Si(111)/CoSi2. A TEM study of the formation of CoSi2 on Si(100) is therefore being conducted. We have previously reported TEM observations on Si(111)/CoSi2 grown both in situ, in an ultra high vacuum (UHV) TEM and ex situ, in a conventional Molecular Beam Epitaxy system.The procedures used for the MBE growth have been described elsewhere. In situ experiments were performed in a JEOL 200CX electron microscope, extensively modified to give a vacuum of better than 10-9 T in the specimen region and the capacity to do in situ sample heating and deposition. Cobalt was deposited onto clean Si(100) samples by thermal evaporation from cobalt-coated Ta filaments.

The use of transmission and analytical electron microscopy in studying reactions and phase transformations in thin film

1993 ◽  
Vol 51 ◽  
pp. 842-843
Author(s):  
K. Barmak
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Transformations ◽  
Analytical Electron Microscopy ◽  
Ex Situ ◽  
Multilayer Thin Films ◽  
Absolute Concentration ◽  
Analytical Electron ◽  
Deposition Step

Generally, processing of thin films involves several annealing steps in addition to the deposition step. During the annealing steps, diffusion, transformations and reactions take place. In this paper, examples of the use of TEM and AEM for ex situ and in situ studies of reactions and phase transformations in thin films will be presented.The ex situ studies were carried out on Nb/Al multilayer thin films annealed to different stages of reaction. Figure 1 shows a multilayer with dNb = 383 and dAl = 117 nm annealed at 750°C for 4 hours. As can be seen in the micrograph, there are four phases, Nb/Nb3-xAl/Nb2-xAl/NbAl3, present in the film at this stage of the reaction. The composition of each of the four regions marked 1-4 was obtained by EDX analysis. The absolute concentration in each region could not be determined due to the lack of thickness and geometry parameters that were required to make the necessary absorption and fluorescence corrections.

Transmission Electron Microscopy of Epitaxial silicides grown by ultra high vacuum deposition

1989 ◽  
Vol 47 ◽  
pp. 462-463
Author(s):  
D. Loretto ◽  
J. M. Gibson ◽  
S. M. Yalisove
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Diffraction ◽  
High Vacuum ◽  
High Energy ◽  
Energy Electron ◽  
Ultra High Vacuum ◽  
Ex Situ ◽  
Transmission Electron

The silicides CoSi2 and NiSi2 are both metallic with the fee flourite structure and lattice constants which are close to silicon (1.2% and 0.6% smaller at room temperature respectively) Consequently epitaxial cobalt and nickel disilicide can be grown on silicon. If these layers are formed by ultra high vacuum (UHV) deposition (also known as molecular beam epitaxy or MBE) their thickness can be controlled to within a few monolayers. Such ultrathin metal/silicon systems have many potential applications: for example electronic devices based on ballistic transport. They also provide a model system to study the properties of heterointerfaces. In this work we will discuss results obtained using in situ and ex situ transmission electron microscopy (TEM).In situ TEM is suited to the study of MBE growth for several reasons. It offers high spatial resolution and the ability to penetrate many monolayers of material. This is in contrast to the techniques which are usually employed for in situ measurements in MBE, for example low energy electron diffraction (LEED) and reflection high energy electron diffraction (RHEED), which are both sensitive to only a few monolayers at the surface.

CONSERVATION OF RARE SPECIES PLANTS AND LICHENS IN SITU WITH PLANNED ANTHROPOGENIC ACTIVITIES: BASIC APPROACHES AND IMPLEMENTATION PRINCIPLES

2018 ◽  
Vol 12 (7-8) ◽  
pp. 38-45
Author(s):  
A. N. EFREMOV ◽  
N. V. PLIKINA ◽  
T. ABELI
Keyword(s):  
Rare Species ◽  
Technology Implementation ◽  
Technology Development ◽  
Anthropogenic Activities ◽  
Natural Habitat ◽  
Local Population ◽  
Main Stage ◽  
Social Risks

Rare species are most vulnerable to man-made impacts, due to their biological characteristics or natural resource management. As a rule, the economic impact is associated with the destruction and damage of individual organisms, the destruction or alienation of habitats. Unfortunately, the conservation of habitat integrity is an important protection strategy, which is not always achievable in the implementation of industrial and infrastructural projects. The aim of the publication is to summarize the experience in the field of protection of rare species in the natural habitat (in situ), to evaluate and analyze the possibility of using existing methods in design and survey activities. In this regard, the main methodological approaches to the protection of rare species in the natural habitat (in situ) during the proposed economic activity were reflected. The algorithm suggested by the authors for implementing the in situ project should include a preparatory stage (initial data collection, preliminary risk assessments, technology development, obtaining permitting documentation), the main stage, the content of which is determined by the selected technology and a long monitoring stage, which makes it possible to assess the effectiveness of the taken measures. Among the main risks of in situ technology implementation, the following can be noted: the limited resources of the population that do not allow for the implementation of the procedure without prior reproduction of individuals in situ (in vitro); limited knowledge of the biology of the species; the possibility of invasion; the possibility of crossing for closely related species that сo-exist in the same habitat; social risks and consequences, target species or population may be important for the local population; financial risks during the recovery of the population. The available experience makes it possible to consider the approach to the conservation of rare species in situ as the best available technology that contributes to reducing negative environmental risks.

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