eChapters

Etiology

It is a pruritic transmissible dermatological condition caused by Cheyletiella yasguri, one of the surface living mite.

Introduction

The minimum dissolved oxygen (DO) level that fish can safely tolerate depends upon temperature and to a certain extent the species. Volubility of oxygen increases as temperature decreases. In ponds, DO can change dramatically over a 24-hour period. During the day oxygen is produced by photosynthesis, the process by which green plants convert water and carbon dioxide in the presence of light, to oxygen and carbohydrates. During the night and day oxygen is consumed by respiration, the process by which plants and animals use oxygen to produce carbon dioxide as they burn carbohydrates, but in the day photosynthesis usually produces more oxygen than is used.

There are several difficulties involved with consuming and storing microgreens. Addressing low shelf life and putting into practice efficient postharvest management for microgreens provide formidable challenges for researchers. It's critical to comprehend any relationships that might exist between spoiling and human pathogen contamination. Research has indicated that microgreens including basil, lettuce, parsley, melons, and spinach can have infections from pathogens during the seed-to-harvest stage (Alegbeleye et al., 2018). Growing environments that support the growth or transfer of microorganisms, processing techniques that expose the crop to contaminants from people or animals, and physiological traits of the plant that facilitate contact and binding with microorganisms are some of the factors that contribute to this risk (Maluin et al., 2021). Because external fertilizers and manures are applied sparingly, there is little contamination even though microgreens are protected from pests and insects by controlled surroundings.

Introduction

Fisheries management is the scientific approach that is heavily influenced by ecosystem theory but primarily focuses on fishing activity. In inland waters, it expanded from wildlife management and involved direct intervention in habitat and species composition. (Lackey, 1999) In marine ecosystems, management strategies focus on controlling fishing while using indicators for ecosystem and resource status. It is an integrated process concerned with collecting information, inspecting, organizing, decision-making, resource allocation, and regulation enforcement. Its goal is to sustainably utilize fishery resources for human livelihood, food, and recreation.

Bennett’s Hierarchy

To set the scene for this we head back to the 1970s when Claude Bennett worked as a specialist in evaluation with the extension service. He wanted to make sure that extension was collecting information that was able to illustrate the effectiveness of extension, and help extension improve its services to clients. So, he developed seven categories of criteria for evaluating extension programmes based on what he called a ‘seven link chain of events. He put these into a hierarchy literally in his article describing this-as a diagram of seven steps.

Polymerase Chain Reaction (PCR) is a laboratory technique, developed by Kary Mullis in the 1980s, used in molecular biology to amplify and replicate a specific segment of the DNA (Mullis, 1990). This reaction in performed in a thermal cycler, involving three main steps: denaturation, annealing and extension.

Principle: PCR is based on the principle of selectively amplifying a specific region of DNA through a series of temperature-controlled cycles. The key components involved in PCR include the target DNA sequence, oligonucleotide primers, DNA polymerase enzyme (Taq DNA polymerase), deoxyribonucleotide triphosphate (dNTPs) (A, T, G, and C), Mg2+ and a thermal cycler apparatus. Initially, the double-stranded DNA is split into single strands under high temperature of 90-95 0C known as the denaturation step. It is followed by cooling the solution to a temperature that allows proper attachment of the oligonucleotide primers to its complementary sites in the strands, known as the annealing step.

This chapter provides an insight into the genotypic and phenotypic correlations between plant traits. It incorporates the study of genotypic and phenotypic path analysis and the understanding of genetic variability, all illustrated through practical examples in R, relevant to plant breeding research.

Path Analysis

Path analysis explains not only the direct impact of one character on another but also indirect effects mediated through other variables in the system. The approach is similar to the analysis of variance and is sometimes referred to as the analysis of correlation coefficients. A notable feature of path coefficients is that they are standardized partial regression coefficients, devoid of units. This standardization allows for the direct effects of different variables to be compared and ranked based on their magnitude. This approach was first applied in plant studies by Dewey and Lu in 1959, particularly to examine the factors influencing seed yield.

Path Coefficients

In the computation of path coefficients, a path diagram is translated into a series of simultaneous equations. These equations reveal the direct and indirect contributions of causal variables to the outcome. For example, in the field of plant breeding: consider the yield of forage (Y) being influenced by different variables. These could include the leaf length (X1), leaf width (X2), and number of leaves per plant (X3).

Introduction

Innovation as a new idea, method, or object may be developed by research or by a farmer. Diffusion is a special type of communication on innovations. The proper use of innovation is called adoption. Communication is different from diffusion in the sense that communication covers all types of messages whereas diffusion is concerned with a message of new ideas. The extension workers need to understand the meaning of diffusion, adoption processes, innovation, etc. by which farmers accept new ideas. Adoption is a sequence of thoughts and actions which an individual goes through before s/he finally adopts a new idea. The adoption process is a mental process for passing the new idea to final adoption. In the diffusion process, the new idea spreads from its source of invention or creation to its ultimate users or adopters. Perception is an activity through which an individual becomes aware of objects around oneself and of events taking place.

Elements in the Diffusion of Innovations

The four main elements in the diffusion of innovations are innovation, communication channels, time, and social systems.

The Innovation

Innovation is a new idea expressed in terms of knowledge, persuasion of decision for adoption. The perceived attributes of innovations are relative advantage, compatibility, complexity, trialability, and observability.

Relative advantage: The innovation should have a relative advantage over the existing ideas in terms of economic and social-prestige factors, convenience, and satisfaction. The advantage can be influenced by providing various incentives.

Compatibility: The innovation should be compatible with the socio-cultural values and beliefs of people.

R - Enamel can: The acid resistant, gold coloured enamel treated can are called R enamel cans. It is used for canning of acidic food which have soluble colouring pigments.

R value: R value is a measure of resistance to the flow of heat through a given thickness of a material (insulation) with higher numbers indicating better insulating properties. R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation.

Rabbitto and putridity: The surface taint of the milk caused by Pseudomonas putrefaciens is called rabbitto and putridity.

Racking: An important operation for the wine production in which wine is siphoned off and is transferred to a fresh vat with the help of a false bottom. Racking is repeated decanting to remove the slowly setting cloud of the freshly fermented young wine. It is also called clarification. It is synonym to siphoning.

Introduction

Strawberry (Fragaria x ananassa Duch.) is a perennial herb that belongs to the Rosaceae family (Bayat et al.2019). Strawberry is sweet and has a distinct fragrance. Strawberries are a popular fruit that are known for their sweet taste, bright red color, and high nutritional value. It is abundant in several vitamins and nutrients, including carotene and anthocyanins. It is popularly regarded as the important table fruit of millions of people around the globe and well-liked by consumers. Strawberry, which has 98% edible component, is regarded as a whole fruit. typically eaten fresh and raw. They are tasty, healthful, and low in calories. Strawberries grow well in India in conditions that are often temperate in the north, subtropical in the plains, or tropical at high altitudes. The primary reason strawberry production is still in its infancy in India, despite its handsome fruits and palatable flavour, is that it is a perishable crop (Pramanick et al. 2012). The strawberry is a fruit that grows all over the world. The Roman poets Virgil and Ovid wrote about it in the first century, and gardeners have been growing strawberries in England since the sixteenth century (Boriss et al. 2006).

Fruit ripening is a phenomena during which horticulture produce undergoes a series of complex physical and biochemical changes initiated through a series of hormones (Ethylene, auxin, abscisic acid (ABA), gibberellins, jasmonic acid, etc.) to attain maximum physiological maturity and favourable organoleptic properties. These changes lead to alterations in colour, texture, aroma, flavour and nutrient composition. In a nut shell, ripening involves increase in pulp to peel ratio, solubilisation of pectic substances, degradation of complex carbohydrates, organic acids and chlorophyll, accumulation sugars, flavour volatiles, polyphenolic compounds and pigments (carotenoids, xanthophylls and anthocynanins). The extent of these changes guide harvesting, readiness for processing and consumption decisions, with physic-chemical alterations serving as indicators of optimum ripeness. Respiration rate, ethylene and ABA are key regulators of fruit ripening in climacteric and non-climacteric fruits, respectively. In climacteric fruits, ABA interacts with ethylene, influencing the synthesis of ethylene itself. Although there is ample documentation on the involvement of hormones in fruit development and ripening, our understanding of the functions of various hormones throughout growth, maturation, and specific ripening processes remains incomplete.

The future of genetically modified organisms (GMOs) presents a complex and multifaceted landscape, intertwining scientific innovation, regulatory challenges, environmental considerations, and societal acceptance. This article explores the potential advancements in GMO technology, including enhanced nutritional content, increased crop yields, and resistance to pests and diseases. It also examines the ethical and ecological implications, such as gene flow to non-GMO species and the potential impacts on biodiversity. Regulatory frameworks and public perception are discussed, highlighting the need for transparent communication and robust safety assessments. Ultimately, the future of GMOs will depend on a balanced approach that addresses both the opportunities and challenges, ensuring that this technology can contribute to sustainable agriculture and food security in a responsible manner.

India is the second largest producer of fruits However, the export potential of fruits and vegetables is very negligible. This is because of improper knowledge to the farmer about proper post-harvest infrastructure facilities. Fruits have a high-water content ranging from 70-95 per cent. They dry quickly under any normal atmospheric condition. These causes loss of rigidity and shrinkage of the cells cause wilting and shrivelling. Appropriate packaging ensures prolonged the shelf life of fruits and vegetables by preventing moisture loss and thereby wilting. Transportation is a critical phase in the fruit supply chain that can significantly affect the quality of fruits. Several factors during transportation can lead to quality degradation such as temperature/humidity fluctuations, mechanical damage, transit time etc. To mitigate the adverse effects of transportation on fruit quality, best practices ie, real-time monitoring, temperature and humidity control, loading/unloading techniques can be employed. Quality evaluation is a critical component in the fruit industry, encompassing a range of assessments to ensure fruits meet the desired standards for consumer satisfaction, shelf life, regulatory compliance, and market competitiveness. It involves a comprehensive approach that includes physical, chemical, and sensory assessments, supported by advanced technological tools, to maintain and enhance the quality of fruits throughout the supply chain. This book chapter deals with the effective packaging, transportation, and quality evaluation of fruits, ensuring that consumers receive fresh, high-quality produce.

This chapter covers plant breeding’s present, past, and future prospects with a special emphasis on cultivar development. In order to increase agricultural production and productivity (yield per unit area) of important crops, plant breeders have achieved significant achievements in the genetic enhancement of yield, adaptive features, disease–pest resistance, abiotic stress tolerance, and nutritional qualities. Plant breeding is more crucial than ever to address production issues in order to provide a steady supply of food, feed, and fiber due to the growing demands of the human population and rising climate fluctuations. Now a days plant breeders have advanced tools to create superior cultivars because of recent technological developments in the fields of phenomics, genomics, and biotechnology. This chapter has covered important topics of crop domestication, pre-Mendelian and post Mendelian plant breeding, plant breeding in the 20th and 21st centuries, including information on the green revolution, genetically engineered crops, molecular marker applications, image-based phenotyping, machine learning techniques, and the relationship between both public and private plant breeding organizations, and future plant breeding efforts.

GPCRs are integral membrane proteins that contain seven transmembrane (TM) α-helices, with a short cytoplasmic Helix 8 interconnected to the TM7 and the cytoplasmic C terminal. The amino terminal is extracellularly disposed.

The 7 TM helices are interconnected by 3 extracellular and 3 intracellular loops. On the extracellular side between TM3 and TM4 is located a conserved disulphide bond. GPCRs being allosteric proteins, agonist binding at one site that is accessed from the extracellular space and termed the orthosteric site, promotes allosteric binding to another partner, a heterotrimeric G protein at the cytoplasmic side. Agonist binding not only promotes binding of the receptor to a G protein, but the affinity of the agonist for the receptor is increased by the G protein.

The world turned into a grossly inhabitable during the infamous COVID-19 pandemic, with community health issues everywhere. Each one felt unsafe if other earthly inhabitants were, be it humans or other living beings. Onset of SARS CoV-2 set a ‘new normal’ world order. The ever-evolving and mutating SARS CoV-2 variants extended the pandemic wave after wave thereby complicating the situation, pushing the global healthcare system to its limits and exposing its underbelly. The continually evolving variants were more aggressively transmissive and infective. As the world still reels under tremendous healthcare pressure, other infectious diseases are emerging as are identified by the World Health Organisation (WHO), creating international health emergency situations. The situation becomes alarming with the increasing zoonotic (spillover) and reverse zoonotic (spillback) factors being more proactive in the disease spread. There is a greater need to vaccinate not only humans but also animals, especially the domesticated ones and known reservoirs/carriers. Vaccines must be developed on priority and equitably distributed as the first step to counter a pandemic or potential pandemic. Vaccination is self-limiting due to increasing reported breakthrough infection cases. A strong link of the environmental health to the overall global health needs to be acknowledged, and due diligent measures taken. Hence, there is a strong need of the One Health approach as a 360° solution, and follow it up at global-scale both in letter and spirit. This chapter discusses spillover and spillback of diseases like SARS-CoV-2 and Mpox as case examples, the mitigation strategies and the need for workable One Health models, and challenges and measures to counter future outbreaks. It stresses on foolproof vaccination strategies across to catalyse individual and herd immunities for universal wellbeing.

Intellectual property (IP) encompasses creations of the human intellect, including inventions, artistic and literary works, as well as symbols, names, and designs. Intellectual property rights (IPR) are legal mechanisms thaprovide creators with exclusive rights to use, manage, and profit from their creations. These rights help protect the interests of innovators and promote continued creativity and innovation.
Intellectual Property Rights refer to the legal entitlements granted to individuals or organizations over their creative and intellectual works, such as patents, trademarks, and copyrights. These rights grant exclusive control or usage privileges for a specific duration, often creating a temporary monopoly. While the concept of intellectual property began to take shape in the 19th century, it was only during the 20th century that it was formally integrated into global legal frameworks.
Intellectual Property Rights (IPR) safeguard the creations of the human mind, such as inventions, artistic and literary works, brand names, logos, designs, and images used in commerce. These rights help foster innovation by allowing creators and inventors to benefit economically from their work.
Key Points
1. Intellectual Property Rights are legal protections acquired by creators or owners of intellectual works.
2. Intellectual property encompasses intangible assets that result from human creativity and thought.

Gladiolus is a genus comprising around 260 species of perennial flowering plants in the iris family (Iridaceae). Commonly known as "sword lilies," the name derives from their long, blade-like leaves—gladius being the Latin word for "sword." These plants grow from underground storage organs called corms and feature tall, unbranched stems that bear vibrant, trumpet-shaped flowers arranged in a single-sided spike. Their striking appearance makes them highly valued both in gardens and as cut flowers.
Most gladiolus species are native to sub-Saharan Africa, particularly South Africa, though some are also found in Europe and Asia. The flowers come in a wide variety of colors, forms, and often display intricate patterns or ruffled edges. Each flower is bisexual and sits between green bracts, with its tepals forming a characteristic funnel-shaped corolla. Known for their bold inflorescences and extended vase life, gladiolus flowers are a popular choice in floral design and landscaping worldwide

12.1 Nutritional Value of Egg
The egg is one of the most complete and versatile foods available. It consists of approximately 10 percent shell, 58 percent white and 32 percent yolk. Neither the colour of the shell nor that of the yolk affects the egg’s nutritive value. The average egg provides approximately 313 kilojoules of energy, of which 80 percent comes from the yolk. The nutritive content of an average large egg (containing 50 g of edible egg) includes, 6.3 gram protein, 0.6 gram carbohydrates and 5.0 gram fat (this includes 0.21 g cholesterol). Egg protein is of high quality and is easily digestible. Almost all of the fat in the egg is found in the yolk and is easily digested. Eggs contain every vitamin except vitamin C. They are particularly high in vitamins A, D, and B12, and also contain B1 and riboflavin. Provided that laying hens are supplemented according to the Optimum Vitamin Nutrition concept (see chapter ‘Optimum vitamin nutrition of laying hens’), eggs are an important vehicle to complement the essential vitamin supply to the human population.

Creating and sustaining a healthy aquarium depends on the correct setup and operation of filtration, aeration, and heating systems. These components function collectively to maintain clean water, adequate oxygenation, and consistent temperatures—key elements for the health and comfort of aquatic life.
Filtration systems clear debris, neutralize toxic substances like ammonia and nitrites, and provide a home for beneficial bacteria that fuel the nitrogen cycle. Options include internal filters, canister models, sponge filters, and hang-on-back units, each ideal for different tank capacities and setups.
Aeration equipment—such as air pumps, bubble stones, and diffusers— boosts dissolved oxygen and enhances water movement, which is especially critical in well-stocked or densely planted aquariums and during warmer periods when oxygen tends to deplete. Heaters are essential for tropical tanks, maintaining water temperatures typically between 24–28°C. A stable temperature supports healthy fish metabolism, immune response, and breeding activity. Together, these systems are the core of a functioning aquarium. Choosing the right equipment and maintaining it regularly ensures optimal conditions for both fish and plants.
TYPES OF FILTERS: INTERNAL, EXTERNAL, SPONGE, CANISTER
Aquarium filters come in various types such as internal, external (canister), sponge, and hang-on-back (HOB) filters. Internal filters operate from inside the tank, while external canister filters function outside. Sponge filters work using an air pump that moves water through a foam medium. HOB filters are mounted externally on the tank’s back.