Abstract: Concrete is used as a construction material in structures since the days of Roman and Greek civilisations. Now it is one of the most used construction material on the planet. In present day almost every structure is made of concrete. Therefore its performance under loading is quite important. Concrete structures are very susceptible to cracking and repairs as well as maintenance of concrete structures due to cracking are difficult and very expensive. As a possible solution to this problem, considerable interest has been directed presently towards the introduction of self-healing materials in concrete. Here, attention is focused on different healing approaches including encapsulation techniques and Bioconcrete.
Keywords: Bioconcrete,
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There are two mechanisms which are mainly responsible for this form of healing (1) Due to the continued hydration of unhydrated cement grains and (2) Precipitation of calcium carbonate (CaCO3). Therefore Autogenous self-healing is achieved by hydration reaction of cementitous products present within the matrix. When cracks are formed, the water percolates inside the concrete and reacts with the debris or loose concrete particles and the Portland cement particles remaining unreacted in the cement paste which now reacts to form calcium carbonates and calcium hydroxide resulting in the closure of the crack. Autogenous healing is mostly effective for very narrow cracks. This limitation was addressed by Li and Li (2011), who proposed using engineered cementitous composites (ECC) containing synthetic fibers, such as polypropylene (PP) and polyvinyl alcohol (PVA) for restraining crack width. Moreover, a constant supply of water must be present to support the hydration process. So superabsorbent polymers (SAP) which can store and supply moisture over longer period of time can be used. Their function is to absorb water during wet periods and release it slowly during dry periods. Water is thus made continuously available for the autogenous healing
Repairing a damaged concrete garage floor can be expensive and there is no guarantee that an accident won't occur to ruin the concrete as soon as the work is complete. An epoxy covering eliminates the worry of damage and will last for years. In addition, the cost is considerably less than other surfacing options or repair work. It is recommended that the services of a professional be employed to install the epoxy coating. Hiring a professional is more convenient and safer for the homeowner than doing the job
We live in a world where being medicated has become a societal norm. Modern health care practices have set the stage for the proliferation of direct-to-consumer advertising (DTCA) of prescription drugs by pharmaceutical manufacturers. Some of these practices include the emergence of managed care organizations (MCOs), the legalization of DTCA of prescription drugs, the emergence of the Internet as an alternative promotional channel, the increased desire by patients to become more involved in their own health care decisions, the disillusionment with traditional medicine, and the rise of ‘alternative’ medicine, to name a few. There is an ongoing debate as to the ultimate harm or benefit of this relatively recent practice of pharmaceutical manufacturers to direct their promotional efforts away from the physician and towards the consumer.
Threshold 5 tackles the beginning of life on Earth. This is where any living things are characterized by metabolism, homeostasis, and reproduction. Over time, the genetic makeup of any living thing change so later generations being slightly different. This results into diversification and the evolution of certain species that best suit their environment. However, threshold 5 also deals with the idea of dealing with the “natural world.” It may seem that the environment is almost entirely man-made but the “natural world” is still a huge part of the environment. This can be simple as the earth on the ground, the air that people breathe in, or even the sun that provides the heat and light to the planet. However, as human technology progresses the “natural world” becomes less and less apparent in the world today.
In the introduction I gave a few examples of products that adhesives have helped us in everyday life. Now, I want to zero in on a specific area or product that has changed use for the better. That area is liquid glue or scientific name of Cyanoacrylates. They go by the trade names of Super Glue, Gorilla Glue and Permabond to name a few. These products have made fixing our little mishaps easier and quicker. I will deal with the product Super Glue in this paper.
Genetic engineering depends on the location and analysis of genes on chromosomes and ultimately DNA sequencing. The early cartography of the genes used the principles of Mendelian genetics . It is assumed that alleles that are transmitted together side by side are located on the same chromosome : it is said that are connected or linkage . These genes form a bridging group - linkage group : are the same for gametes and are usually transmitted together , so they do not have independent distribution. Crossing-over occurring during meiosis may cause these alleles can be exchanged between the chromosomes of a homologous pair .
Over the past few decades, advances in technology have allowed scientists to actively manipulate the genetic sequence of an organism through a process called 'genetic engineering'. Many believe that this is a technique which we should exploit and take full advantage of as, after all, it may be the key to curing many hereditary diseases such as heart disease and cancer. It may very well be the solution to overcoming evolutionary barriers and allow us to breed new species. However, if you consider the unknown consequences we may have to face as a result of our futile experimenting, you would find that messing with a system as intricate as nature for curiosity's sake is hardly justifiable.
Modern technology has taken amazing strides in the past few years. We have changed the way we deal with food production, agriculture, and many other aspects of life.. Scientists have begun utilizing these advances in technology and knowledge to gain insight as to how the human species functions. They are on the verge of manipulating the way humans relate to the natural world. This revolutionary breakthrough is what is known as Genetic Engineering. Genetic Engineering is the process of manually adding new DNA molecules into an already existing organism. A simplified version of the process works by physically removing a gene from one organism and placing it into another. This is being done in an effort to
Is genetic engineering right or wrong? To answer these questions we need to define genetic engineering. It is the use of biotechnology to control the genes of an organism. Genetic engineering isn’t new. It has been with us for centuries. In those days, we used it for agriculture and selective breeding of animals. Our pets, especially dogs and cats are good example of selective breeding.
This paper goes over genetic engineering and how it is used today in the medical field as two types on humans, disabled genetic engineering and trait genetic engineering. This two types of genetic engineering are still debatable since they have to surpass many obstacles and laws. The sources gave statements from professionals and experts on genetic engineering, biomedical science, biomedical engineering, and human anatomy and physiology. The individuals gave their inputs on how they view genetic engineering on human beings.
Reading up information and searching for clues (which were not extremely easy), turns out to have broadened my knowledge on Nature and Biomimicry itself and that there are so many people already using wind turbines to harvest the winds energy and know how the world can be saved. Therefore I have come to the conclusion and have seen that my hypothesis has been proven right.
Concrete is a composite material used widely in the construction industry. Concrete is basically a mixture of cement, water, aggregates and admixture (sometimes). Cement is a fine gray powder that consists of oxidizes calcium, silicon and aluminum. The aggregate used is normally gravel, crushed stone or sand. Admixture is a solid or liquid substance that gives a certain characteristics of the concrete. The cement reacts with water chemically and binds the aggregates together through a process called hydration during hardening or curing of concrete. It means that water helps in the hardening of the concrete while the cement bind the aggregate and also react with water to form a solid mass.
Microbes are microscopic life forms, usually too small to be seen by the naked eye. Although many microbes are single-celled, there are also numerous multi-cellular organisms. The human body has 10-100 trillion microbes living on it, making it one giant super-organism. Since the first link between microbes and diseases was made, people have been advised to wash their hands. Scientists, however, have recently started to investigate more closely how the microbes that call the human body home affect our health. While some microbes cause disease, others are more beneficial, working with our bodies in many subtle ways.
Leboffe, M. J., & Pierce, B. E. (2010). Microbiology: Laboratory Theory and Application, Third Edition 3rd Edition (3rd Ed.). Morton Publishing
Synthetic biology, also known as synbio, is a new form of research that began in the year 2000. The Action Group on Erosion, Technology and Concentration (ETC Group) says that synthetic biology is bringing together “engineering and the life sciences in order to design and construct new biological parts, devices and systems that do not currently exist in the natural world’ (Synthetic Biology). Synthetic biology is aiming to create safer medicines, clean energy, and help the environment through synthetically engineered medicines, biofuels, and food. Because synthetic biology has only existed for fourteen years, there is controversy involving its engineering ethics. In this literature review, I am going to summarize and correlate the International Association for Synthetic Biology (IASB) Code of Conduct for Gene Synthesis, the impact of synthetic biology on people and the environment, and the philosophical debates.
The myriad mysteries of science can be unraveled by the emerging technologies including Biotechnology. Science has always been my interest and forte thus, the choice of Biotechnology as my academic option was the ideal decision. I had prepared for the highly competitive entrance exam AIET to get admission into the integrated Masters Degree in Biotechnology and Bioinformatics at Dr. D.Y. Patil University and secured 87th all over India rank and was proud to gain admission to this venerated university. The academic curriculum has introduced me to amazing subjects like ‘Microbiology’, ‘Molecular Biology’, ‘Biochemistry’, ‘Genetics’ and ‘Industrial Biotechnology’. Although many seminal biological events have been explained in theory during the past century, the technology to harness their potential for benefiting humankind has only been possible during the past few decades. This is testament to the great improvements in biotechnologies and I am glad to be a part of this grand scientific experience.