eChapters

A DSLR, or “Digital Single Lens Reflex” camera, uses a mirror mechanism to direct light from the lens to an optical viewfinder, allowing the photographer to see exactly what the lens sees. When the shutter is activated, the mirror moves aside, allowing light to reach the image sensor, capturing the photograph. While single-lens reflex cameras have been around in various forms since the 19th century, initially relying on film, the first commercially available digital SLR with an image sensor emerged in 1991. Unlike point-and-shoot or phone cameras, DSLR cameras allow for interchangeable lenses, offering greater
flexibility.
Working Principles of DSLR Camera
When using a DSLR camera, the image seen through the viewfinder at the back of the camera is the actual view through the lens. This ensures you are previewing the precise scene you intend to capture. Light from the scene enters through the lens and hits a reflex mirror positioned at a 45-degree angle inside the camera. This mirror directs the light vertically to an optical component known as a “pentaprism.” The pent prism then reorients the light horizontally by passing it through two internal mirrors, delivering the final image into the viewfinder.

In Individual Contact Method, the extension agent engages with individuals on a one-on-one basis, ensuring personalized interaction with each person. This method is employed when the target audience is limited in number, geographically proximate to the communicator, and ample time is allocated for effective communication.

Farm and Home Visit

This method entails direct, face-to-face interactions between extension agents and farmers, typically conducted either on the farm or at the farmer's residence. Its objectives include providing firsthand information on agricultural and household matters, assisting farmers in problem-solving, and aiding in their livelihood sustainability.

Techniques

• Planning and Preparation:

• Identify target audience and topics of discussion.

• Gather relevant materials and publications.

• Schedule visits efficiently and provide advance notice to farmers.

Cities or urban conglomerations are fast developing and where the rate of land availability has infinitesimally small; vertical expansion and taller buildings have emerged and are defining the city skyline. Though this may speak well of the economic development, but the increase in hard paved areas and roads may spell trouble for the environment as urban heat island (UHI) effect. The causes of Urban Heat Island are primarily due to the absorption of solar radiation (Short wave) by building/urban materials that is subsequently re-radiated (long wave) to the surroundings. In addition, heat generated from the use of air- conditioning coupled with the greenhouse effect of pollutants also contribute to the increase in temperature. Such increase in temperature with the presence of air pollutants can result in the accumulation of smog, damages the natural environment and jeopardizes human health. It also costs consumers more money because it takes more energy to cool buildings. Who can forget the regular news of Beijing repeatedly topping the list of most polluted cities and fresh air is available in cans!

Fresh air cans are in no means a firm solution. Plants are atmosphere cleansers, can serve to filter carbon dioxide and other toxins in environment, cool the air by transpiration and also provide cooling shade. Research work shows the benefits of using light colour roofs and roof gardens to minimize the heat gain inside the buildings. This would in turn reduce the energy consumption of air conditioning in buildings. Rooftops, balconies and terraces have often been referred to as the “last urban frontier” of cities, in the sense that they represent the last significant remaining space to be exploited to create a green oasis and an area of relative peace and privacy away from the urban bustle. Given the social, economic and environmental contributions of urban greenery to the quality of life in cities and the realization that cities more often than not lack sufficient greenery, greening of rooftops, balconies and terraces is therefore a logical, effective and high impact way to re-inject the much needed greenery in urban settings thus reinventing the concept of hanging gardens.

Definition

Handing pin cast is used for management of longbone fracture. Pin which is used for immobilisation of fracture of proximal radial and tibial bones is called hanging pin cast.

Special equipment

Intramedullary pin, hand driven drill, plaster of paris bandage Procedures :,

Hantaviruses have been responsible for a variety of human illnesses particularly haemorrhagic fever with renal syndrome (HFRS) and hantavirus pulmonary syndrome (HPS). There are currently 47 recognized sero/genotypes of hantaviruses with considerable geographic diversity. Each hantavirus type appears to be specific to a different rodent host. The different hantavirus types are associated with different types of disease both in terms of target organs and disease severity. HFRS is primarily a disease of the Old World while HPS is a disease of New World. Although the disease may have first been recognized as early as 1000 years ago in China, it affected >3000 United Nations Soldiers during Korean war (1950-1953). Now it is reported that hantavirus affect as many as 2 lakhs people each year in Asia and Europe. The agent of this virus remained unknown until 1978 when Lee and his associates isolated and named Hantaan virus, after a river in South Korea. Other viruses antigenically related to Hantaan virus were characterized and placed under the genus Hantavirus and family Bunyaviridae.

Over the past few decades, the sharp increase of incidences of hantavirus disease in humans throughout the world has been reported. There are 47 recognized hantaviruses with considerable geographic diversity. But the number of hantavirus virus types recognized continues to grow. Hantaviruses cause persistent infections in rodent reservoirs which directly impact transmission of these zoonotic agents between rodents and from rodents to humans. Environmental, 127 demographic and physiological factors likely interact to mediate responses to hantaviruses in natural rodent populations. Although not much work has been carried out, comparisons of human and rodent immune responses to hantaviruses may provide insights into why hantaviruses often are fatal for humans but cause only persistent infections in rodents.

Hard currency : Money you can trust. A hard currency is expected to retain its value, or even benefit from appreciation, against softer currencies. This makes it a popular choice for people involved in international transactions. The dollar, d-mark, sterling and the Swiss franc each became a hard currency, if only some of the time, during the 20th century.

Hawala : An ancient system of moving money based on trust. It predates western bank practices. Although it is now more associated with the Middle East, a version of hawala existed in China in the second half of the Tang dynasty (618-907), known as fei qian, or flying money. In hawala, no money moves physically between locations; nowadays it is transferred by means of a telephone call or fax between dealers in different countries. No legal contracts are involved, and recipients are given only a code number or simple token, such as a low-value banknote torn in half, to prove that money is due. Over time, transactions in opposite directions cancel each other out, so physical movement is minimised. Trust is the only capital that the dealers have. With it, the users of hawala have a worldwide money-transmission service that is cheap, fast and free of bureaucracy. From a government’s point of view, however, informal money networks are threatening, since they lie outside official channels that are regulated and taxed. They fear they are used by criminals, including terrorists. Although this is probably true, by far the main users of hawala networks are overseas workers, who do not trust official money transfer methods or cannot afford them, remitting earnings to their families.

Family: Ixodidae (Hard ticks)

General characters

•These ticks have hard chitinous shield called scutum on their dorsal surface, so they are called hard ticks. Scutum extends over the entire dorsal surface in male and only anterior one-third of dorsal surface in larvae, nymph and female.

 •Mouth parts are anterior and visible from dorsal aspect.

 •Eyes are one pair (if present) situated on the lateral margin of scutum.

•Spiracles are one pair and situated posterolaterally to the fourth coxae. 

 •Basis capituli or capitulum present at anterior, and have mouthparts and palps.

•The body of female may have one pair marginal grooves at lateral side of behind the scutum.

Plant tissue culture is mainly referred to as mass-multiplication of in vitro derived plantlets grown under controlled environment. Subsequently, the production of artificial seeds from in vitro grown plant propagules is also a method of mass-production of true-to-type plantlets. Micropropagation allows rapid and mass production of high quality, disease free and uniform planting material irrespective of the season and weather. Micro-shoots on being transferred to ex vitro conditions are exposed to abiotic (altered temperature, light intensity and humidity conditions) and biotic stress conditions i.e. soil micro-flora, so there is need for acclimatization for successful establishment and survival of plantlets (Deb and Imchen, 2010). In order to increase growth and reduce mortality in plantlets at the acclimatisation stage, research has been focused on the control of the environmental conditions (both physical and chemical) and to acclimatize the plants to compete with soil microflora (Mathur et al., 2008). In this chapter methods of acclimatization of plantlets derived from simple plant tissue culture or from synthetic seeds are discussed.

The ultimate success of commercial propagation depends on the capacity to transfer plants out of culture on a huge range, at low cost and with high survival rates. The plants multiplied in vitro are exposed to a unique set of growth conditions (high levels of inorganic and organic nutrients, growth regulators, sucrose as carbon source, high humidity, low light, poor gaseous exchange) which may support rapid growth and multiplication but also induce structural and physiological abnormalities in the plants, rendering them unfit for survival under in vivo conditions. Poor control of water loss and heterotrophic mode of nutrition are main cause of deficient growth of in vitro plants.  Hence, gradual acclimatization is necessary for these plants to survive transition from culture to the greenhouse or field. During acclimatization the in vitro formed leaves do not recover but the plant develops normal leaves and functional roots. Once roots are well formed the plants are ready to be transferred into soil.The procedure of acclimatization of regenerated plantlets are: 

Introduction

In a technology that consistently maintains a fantastic development curve with capabilities doubling up year-to-year, freezing the hardware specification is not easy or very meaningful. GIS (not geography) owes to its genesis and progress to the developments in information technology front. It may be asserted that any and all upgrade in the hardware industry will only add to its own ability to effectively process more and more data and handle more complex routines. The personal computers of today are seen to be adequate to run typical GIS software. A reference hardware specification is discussed here. GIS software development is an involved process but then the software developers have made good use of hardware capabilities available and have released upgrades consistently. Hardware developments are such that they defy a static spcification. However a reference specification as on 2009. An overview of various software packages used in the past as well as present is attempted. ESRI released a new version in 2002 and claimed that their ArcGIS is an “integrated collection of GIS software products for building a complete GIS that enable users to deploy GIS functionality wherever it is needed, in desktops, servers, or custom applications; over the Web; or in the field.” The details are discussed below. While a number of software overviews are available, this text is not aimed at providing a tutorial to any of the software packages nor do the comparisons made are to promote any particular software. Similarly, it is presumed that the reader is familiar with the hardware elements and functionality. Lot of information about the software packages are available on their respective web sites and the reader is exhorted to look for current, additional and in depth information required in the pages. A brief discussion on Liveware or human resource can be found at the end of the chapter.

In a large random-mating population both gene frequencies and genotype frequencies remain constant from generation to generation in absence of migration, mutation and selection and the genotype frequencies are determined by the gene frequencies. These properties of a random mating population were first explained by G. H. Hardy and W. Weinberg independently in the year 1908 and are generally known as Hardy-Weinberg law. The operational understanding of this law involves three steps as follows:

1. From parents to the gametes they produce.
2. From union of the gametes to the genotypes in zygotes produced.
3. From genotypes of the zygotes to the gene frequencies in the progeny generation.

The gene and genotype frequencies in the original parent generation are assumed as follows:

Pesticides can cause three types of harmful effects – Acute, Delayed and Allergic.

Acute effects: Are those that occur immediately after the exposure, within minutes or hours.

Weeds interfere with man’s utilization of land and water in various ways. The extent of losses depends on the intensity, infestation, time of occurance and type of weeds.

1. Competition between weeds and crops for growth factors

Weeds compete with crop plants for  other factors in the micro-enviroment. Weeds are capable of absorbing more amount of nutrient from soil than the crop plants. In dry lands, weeds exhaust the soil moisture and put the crop under water stress earlier and thus reduce the yield. Weed can compete with productive crop or pasture land or convert the productive land into unusable scrub. Weeds are also often poisonous, produce burrs, thorn or other damaging body parts or otherwise interfere with the use and managemet of desirable plants by contaminating  harvest or excluding livestock.

Introduction

Resource management balances human needs with environmental preservation, focusing on sustainable development, responsible use, and conservation of natural resources. It involves environmental stewardship, economic efficiency, and social equity, ensuring equitable access for all societal segments while meeting present and future demands (Study Smarter, N.D; Mohd Akhter Ali et al., 2023).

There are specific areas such as water, soil, forests, waste, and sustainable harvesting practices. Each area presents unique challenges and opportunities, requiring tailored strategies and interventions to promote sustainability. The interplay between human activities, environmental impacts, and socio economic dynamics through the lens of resource management highlights the need for sustainable practices that balance development with ecological preservation, ensuring equitable resource distribution and long-term economic stability. Emphasis is placed on holistic approaches, participatory decision making, and capacity building to enhance resource governance and promote sustainable practices.

Introduction

In the face of a growing global population and increasing pressures on natural resources, the quest for sustainable and efficient agricultural practices has become highly significant. The integration of livestock with cropping systems and grasslands stands out as a holistic approach that not only addresses these pressing challenges but also unlocks a myriad of economic benefits. This chapter delves into the profound significance of integrating livestock with cropping systems and grasslands in modern agriculture, exploring how this synergistic combination enhances resource utilization, promotes resilience, and fosters a thriving agricultural sector.

The roots of integrated farming practices can be traced back to ancient agricultural traditions, where farmers instinctively recognized the advantages of combining crop cultivation and animal husbandry (Devendra and Thomas, 2002). Over time, this integrated approach evolved and adapted to different cultural and geographical contexts. In traditional mixed farming systems, livestock provided essential services such as draft power (Gomiero et al., 2011), manure for fertilization, and protein-rich food. As agriculture progressed with technological advancements, there was a shift toward specialized monoculture and intensive livestock farming (Herrero et al., 2013). However, the unintended consequences of these systems, including soil degradation, environmental pollution, and declining rural livelihoods, paved the way for a resurgence of interest in integrated farming methods (FAO, 2020).

Anderson defines organizations as structured human relationships wherein individuals purposefully associate in systematically arranged units to advance and achieve common purposes or interests not explicitly articulated within the institution. Each member assumes a formal status and role within this framework. Distinguishing an organization from an institution lies in its focused pursuit of narrowly defined objectives; it constitutes a collective of individuals organized to pursue specific aims. Conversely, an institution encompasses broader and more general objectives, constituting a set of socially endorsed procedures entailing patterned behavior, norms, and regulations. Organizations may function within institutions, thereby contributing to and facilitating the achievement of institutional objectives. The formation and structure of an organization evolve through the delineation of specialized activities, formulation of rules and regulations for operations, establishment of meeting schedules and locations, ultimately rendering the organization a clearly delineated entity with specific objectives, officers, and membership.

Introduction

As we all know that the 21st century has witnessed the changing phenomenon of information and its communication resulting a dynamic transformation not only in the social structure but also in the perception of human mind.  Exchange of information and knowledge has empowered the human being and enabled them to achieve sustainable development. From paper- based society to paperless society, information has remained the most valuable commodity.

Livestock is an integral component of Indian agriculture which is primarily a mixed crop-livestock farming system and plays an important role in the socio- economic life of India. Livestock contributes significantly to the growth and development of agricultural sector by providing a rich source of high quality products such as milk, meat and eggs and by supporting livelihood of more than two third of rural population. Livestock has a crucial and rapidly increasing role infood security and economic stability worldwide Livestock sector contributes for 4.11% of GDP and 25.6% of total Agriculture GDP. The importance of livestock has been undergoing a steady transformation with the contribution of livestock in total agriculture and allied sector Gross Value Added increasing from 24.32% in 2014-15 to 28.63% in 2018-19. Owing to factors such as population and economic growth, urbanization, improvements in transportation and storage practices,its future importanceformeeting human nutritional requirements of food and fiberand a major contributor to agricultural GDP is evident.

To alleviate the concerns raised by a rapidly growing demand of food security and the need of ensuring sustainability of natural resources, we need to better understandthe ways which wouldspeed up commercialization of livestock production so that it can contribute effectively to the bio-economy. Livestock performance and productivity can be improved by adopting proper diet and feeding practices, improved farm management and disease controlstrategies.

Introduction
Aquaculture is the farming of aquatic organisms, which includes fish, mollusks, crustaceans, and aquatic plants. Over the past forty years, aquaculture has played a significant role in increasing the global supply of fish for human consumption, leading to a marked rise in worldwide fish production. Nearly half (49.3%) of the world’s food fish are currently farmed for aquaculture (FAO, 2023). The proportion of inland fisheries and aquaculture in India’s overall fish production has increased from 46% in the 1980s to over 85% in recent years, resulting in the country with the second-largest aquaculture production. Fishing is a thriving industry with a wide range of resources and enormous potential in India. It is also a highly significant economic activity. Aquaculture may be the solution to ensuring global food security because fish can produce significantly more biomass per unit surface area than terrestrial animals. Aquaculture has a significant impact on world food security and is also considered a potential factor for the pollution of vast marine resources. The application of eco-friendly aquaculture methods can help the aquaculture industry thrive sustainably by reducing its negative effects on the environment. In the twenty-first century, biotechnology is becoming a crucial technology for long-term sustainability management and protection (Cantor, 2000).

Introduction
In the ever-evolving landscape of agriculture, the intersection of science and technology continually reshapes the way we approach crop improvement. Among the most revolutionary advancements in recent years is the advent of genome editing technologies. These powerful tools offer unprecedented precision and efficiency in modifying the genetic makeup of plants, holding immense promise for revolutionizing the field of plant breeding. Genome editing plays a crucial role in plant breeding by enabling plant breeders to make precise and targeted changes to the DNA of crops, offering significant advantages over conventional breeding methods. Besides, crop improvement, these new breeding tools shorten the time needed to introduce desirable traits into crops, from decades to just a few years. They have revolutionized plant breeding by providing breeders with the ability to efficiently create crops that are more resilient, better adapted, and can produce higher yields with fewer resources, ultimately contributing to sustainable food production and addressing the challenges posed by climate change and population growth.
This comprehensive review aims to explore the transformative potential of genome editing technologies in genetic improvement of crop plants. The review will commence by elucidating the underlying mechanisms of genome editing technologies, offering insights into the molecular machinery that drives precise DNA modifications mediated by ZFNs, TALENs, CRISPR/Cas, base editing, prime editing and other new variants of CRISPR/Cas systems, highlighting their respective strengths and limitations. From enhancing crop productivity and quality to conferring resistance against biotic and abiotic stresses, these technologies offer a versatile toolkit for addressing pressing agricultural challenges. Case studies and examples from recent research will illuminate the successes and potential pitfalls of employing genome editing in crop improvement efforts. Besides, the regulatory and ethical considerations surrounding the deployment of genome editing in agriculture will be addressed. In conclusion, this comprehensive review seeks to provide a holistic perspective on harnessing genome editing technologies in plant breeding. By elucidating the scientific principles, applications, regulatory challenges, and ethical considerations, we hope to facilitate informed discourse and decision-making surrounding the integration of these transformative tools into agricultural practices. As we stand at the precipice of a new era in crop improvement, embracing the potential of genome editing holds the promise of unlocking sustainable solutions to global food security challenges.