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An amine reacts with a carboxylic acid to form an amide. Similarly, the amino group  on one amino acid molecule reacts with the carboxyl group of another amino acid  to form a compound called peptide. A peptide bond is an amide bond that forms when the –COO- group of one amino acid reacts with the -NH₃+ group of another amino acid. The resulting compounds are called peptides. Even after this there is a reactive amino group and a carboxyl group in the peptide. If these groups react further a poly peptide can form and later a polymer called protein can form.

Agarose gel electrophoresis is used to resolve DNA fragments on the basis of their molecular weight. it will be visulaized by exposing to UV light. Principle: As the phosphate backbone of DNA is negatively charged, the basic principle is the migration of DNA molecules from negative (cathode) to positive (anode) charge under constant electric field. The DNA will be separated mainly on the basis of their size, DNA conformation, concentration of gel and voltage. The distance travelled by the DNA molecules tell us about their molecular weight, where smaller DNA fragments will travel farther than the larger ones due to constant mass/charge ratio of DNA. The separated DNA molecules will be then visualised under UV light in gel documentation system after staining with suitable dye.

This chapter begins by providing an essential overview of different data transformation methods and their importance. It primarily concentrates on exploring three crucial transformation techniques: the square root transformation, log transformation, and arc sine transformation. Additionally, this chapter explores the practical application and analysis of these transformations using the R programming language.

Data Transformation

Data transformation is often needed in statistical analysis and data processing for several key reasons:

• Assumption of homogeneity of variances: ANOVA requires that the variances within each group being compared are equal. When this assumption is violated, i.e., when variances are significantly different across groups, data transformation can help stabilize these variances.

• Normality assumption: ANOVA assumes that the residuals (the differences between observed and predicted values) are normally distributed. However, real-world data often deviates from this normal distribution. Data transformation, such as log or square root transformations, can help in reshaping the distribution of data.

• Handling skewed data: In situations where the data is highly skewed, the results of ANOVA can be misleading. Transformations can reduce skewness, making the distribution more symmetric and suitable for ANOVA.

• Proportional or percentage data: When dealing with data in the form of proportions or percentages, certain transformations (like the arc sine transformation) are necessary. This is because proportions have a bounded scale (0–1 or 0–100%) and their variances are not constant across the range, which can violate ANOVA assumptions

Renewable energy in agriculture represents a transformative shift toward sustainability and efficiency in food production systems. This article explores the various renewable energy technologies that are being integrated into agricultural practices, including solar, wind, biomass, and geothermal energy. It examines the benefits of these technologies in reducing greenhouse gas emissions, lowering energy costs, and enhancing the resilience of agricultural operations against climate change. Additionally, the article discusses the challenges and barriers to widespread adoption, such as initial investment costs, technological limitations, and policy obstacles. Through case studies and real-world examples, the article highlights successful implementations of renewable energy in agriculture and offers insights into future trends and innovations. The integration of renewable energy into agriculture not only supports environmental sustainability but also promotes economic viability and energy independence for farmers, paving the way for a more resilient and sustainable agricultural sector.

Pesticides sustain food production and control disease and pests. They are vital for crop production and instrumental in continuous increase in food production. The consumption of pesticide in India is one of the lowest in the world. India uses a low amount of 0.5 kg/hectare pesticide compared to 7.0 kg/ hectare by USA, 2.5 kg/hectare by Europe, 12 kg/hectare by Japan and 6.6 kg/ hectare by Korea. However, despite the low consumption of pesticides, India has more problem of pesticide residues vis-a-vis other countries and these have entered into food products and underground water because of

ABSTRACT

Jasmine is one of the economically most important flower crops cultivated for its fragrant flowers and valuable essential oil. In vitro studies to explore the possibility of regeneration of plantlets from different explants and to undertake biochemical analysis to detect the flavour compounds if present in the in vitro cultures were taken up with local varieties of Jasminum grandiflorum.

Among the different explants tried, leaf bits were found ideal for callus induction, followed by petals and shoot tips. MS medium with 2, 4-D at 1.25 ppm was the suitable medium for callus induction in leaf explants. Miller medium with NAA at 1.25 ppm and BAP at 1.25 ppm was the suitable medium for callus induction in petal explants collected from 18 days old buds of local varieties of Jasminum grandiflorum. Among the different media combinations tried, MS medium supplemented with 0.2 ppm NAA and 0.3 ppm GA₂ is the best medium for callus induction in shoot apex explants of 10mm size. Direct regeneration of plants was obtained in 10 per cent of shoot apex explants cultured in MS medium supplemented with 0.2 ppm GA₁ and 3 ppm BAP in 60 days. A maximum of 95 per cent embryogenicity is induced in leaf callus transferred to MS basal medium supplemented with 1.5 per cent sucrose from MS medium with 2, 4-D at 1.0 ppm.

The peroxidase assay indicated that embryogenic calli had six isoperoxidases while the non-embryogenic had only two. Biochemical analysis of the callus samples showed high Phenylalanine ammonia lyase and phenol indicating the initiation of phenolic pathway, which branches out and ultimately leads to the synthesis of flavour compounds in callus.

The development of the upper respiratory system composed of nasal cavities, naso pharynx and larynx is directly related to the development of the face. The nasal cavities are derived from ectoderm while nasopharynx and larynx are endodermal in origin. The lower respiratory system (trachea and lungs) is a derivative of the embryonic pharynx.

The epithelial lining of the lower respiratory system is endodermal in origin, while the surrounding connective tissue and cartilage are mesodermal in origin. The endoderm and underlying mesoderm from the floor of foregut i.e caudal part of pharynx grow caudally in midline and form the laryngo-tracheal groove at about the level of the branchial arches IV -VI from which the larynx and trachea arise. The laryngotracheal tube consists of an inner endodermal lining and an outer layer of splanchnic mesoderm. It grows into underlying mesenchyme. Ingrowths from the sides of the groove at about the level of the branchial arches IV - VI form a pair of ridges that grow towards each other and fuse forming a septum changing the groove into a tube with a blind end caudally. The rostral end opens into the floor of the pharynx. The blind caudal end expands in a bilobed manner into mesenchyme forming bronchial buds the primordia of right and left lungs while the groove is closing.

larynx : A pair of elevations, aryteniod swellings appears on the floor of the pharynx along midline at the level of branchial arch IV. The hypobranchial eminence is just infront of the arytenoid swellings. The depression between the hypobranchial eminence and the arytenoid swellings becomes the lumen of the larynx. The caudal part of the hypobranchial eminence forms the epiglottis. The arytenoid swellings and adjacent branchial arch mesenchyme form the other laryngeal cartilages and musculature. The thyroid cartilage arises from branchial arches III and IV. The other cartilages are derived from mesenchyme of branchial arches IV, V & VI. The intrinsic musculature of larynx is derived mostly from the branchial arch V and VI. With the exeption of the epiglottic cartilage the cartilages and muscles of the larynx are formed by the end of embryonic period.

Tannins: Group of plant phenolic compounds found in higher plants as secondary metabolites. Their main function is to defense against microorganisms, insects, and herbivores and in allelopathy.

Taxis (tactic orientation; formerly topotaxis): Movement of motile organisms, cells or organelles, the prevailing direction of which is determined by the direction of the stimulus.

TATA box (Hogness box): A sequence of nucleotides which serves as the main recognition site for the attachment of RNA polymerase in the promoter region of eukaryotic genes. Located at around 25 nucleotides upstream of the transcriptional start site. It consists of seven base consensus sequence, TATAAAA.

TCA cycle: Tricarboxylic acid cycle. It is also called as citric acid cycle or Krebs cycle, It is a step in aerobic degradation of glucose to convert into energy. During this cycle several intermediates are produced, which leads to several metabolic pathways. During this cycle, there is production of reductancts such as NADH, FADH and GTP.

Telomere: Sequences at both termini of each eukaryotic chromosome that facilitate replication.

Objectives

1. To study the weeds and its control.
2. To study the herbicides, their types, timing and methods of application.

Weed: A wild plant growing where it is not wanted and in competition with cultivated plants.

Or

Weed is such undesirable plant grown in association with crop which snatches major parts of nutrients, water, light, place and CO₂ available to the crop.

Due to tough competition crop suffers adversely and the production is reduced.

Introduction

Impact studies isolate the effect of an intervention by assuring that there is clean comparison between a treatment group that received the intervention and a comparison group that is just the same except that it did not get the intervention.

Impact studies test whether one thing causes another. Just knowing scores have gone up following an intervention doesn’t mean improvement is attributable to that intervention.

The data are generated from an impact study used to identify best practices, to replicate successful programs or policies, and to avoid mistakes that might have negative implications for future projects.

Carnation (Dianthus caryophyllus L.) belonging to the family Caryophyllaceae is very remarkable as a cut flower crop all over the world. It is well known for its attractive flowers with fragrance and varying colors. In India, the area under its cultivation is 2190 ha with a production of 8940 tones. But its production is affected by a number of insect pests and spider mite.
It is the two spotted spider mite or red spider mite which is considered as one of the most serious pests of carnation. High temperatures and low relative humidity favor the multiplication of these mites. These mites are found to be persisting throughout the year under polyhouse conditions.
Host range
Citrus, grapes, apples, pears, tomatoes, okra, potatoes, eggplant, beans, cucumbers, peppers, roses, jasmine, tea, coffee etc.

Hydrological cycle involves four major steps, Viz., Evaporation, Transpiration, Condensation and Precipitation. Though the cycle has neither a beginning nor an end, the concept of cycle begins with the water of oceans, since it occur nearly ¾ of the Earth’s surface. Radiation from the Sun, evaporates water as water vapour from the oceans into the atmosphere. The water vapour rises and collects to form clouds. Under certain condition, the cloud moisture condenses and falls back to the Earth as rain, snow, hail etc. Precipitation reaching the Earth surface may be intercepted by vegetation or enter into the soil, may flow as run-off or may evaporate.

Evaporation may be from the surface of the ground or from free water surface. Transpiration may be from plants.

Condensation: The physical process by which a vapour becomes a liquid or solid – opposite of evaporation.

Sweet potato weevil: Cylas formicarius: Apionidae

It is a specific pest of sweet potato and the most important one. Adult weevils are ant-like, slender bodied having elongated snout-like bluish-brown head with geniculate antenna, bright red thorax and leg tips and bluish-brown elytra. Females make small cavities on the tubers or stems and lay eggs singly. Each female lays 180-200 eggs. Grubs are elongate, legless, pale-yellowish white in colour with smaller brown head. Pupation takes place in larval tunnels in the tuber. Incubation, grub and pupal stages last for 5 to 8, 14 to 17 and 4 to 5 days respectively. Life cycle is completed in 4-5 weeks and adults live for 95-110 days. The grubs bore into stems, tunnel inside and feed on soft tissues. Grubs and adults bore into tubers both in field and storage godowns. Affected tubers develop dark patches, which later start rotting. Feeding holes and adult emergence holes can be seen on vines and tubers.  In severe infestation the collar region of the plants shows unusual thickening due to proliferation and hypertrophy of tissues causing a characteristic terpenoid odour.  Even the slightly damaged tubers are unsuitable for cooking and consumption.  Hence yield loss in practice may come to 100% in many cases.

Sprain : It is defined as a joint injury in which fibers of supporting ligaments of the joint are ruptured by direct or indirect trauma. Depending upon the degree of ligament rupture, sprain can be classified as follows: 

Reproductive process involves many events that have to occur in a well balanced manner if satisfactory fertility rate is to be achieved. Any adverse  effect of  physiological, morphological  or environmental effect on the male  or  female may result  in failure  of  fertility  or reduced fertility  depending  on the severity of the cause. Apart from this, the role of person who stands between the cow and the bull play an important role. The efficiency of the person handling the semen and depositing in the reproductive tract of domestic animal will influence to a great extent on the conception rate in A.I. programme. It is observed that certain bovine population fails to conceive at a single service or series of services.   Some times there is loss of conceptus during gestation or produces a dead calf or weak calf that will die soon after birth.
 
Consequences of these factors affect cows and may have long calving interval, abortion or sterility, all of which tend to decrease the average daily production of milk.

Before applying fungicides in field at large areas, it is required to be thoroughly investigated under laboratory conditions for its efficacy on pathogen, subjected. Basic methods of testing these chemicals against subjected pathogen, under laboratory conditions are described here.

1. Poisoned Food Technique

Principle

The principle involved in this technique is to poison the medium with fungicides and then allow a teat fungus to grow on such medium. The test may be conducted both on solid and liquid medium.

The kidneys develop from the nephrotome (intermediate mesoderm). The series of nephrotomes forms urino-genital ridge which splits up into an lateral nephric and a medial genital ridge, which project into the coelom from the dorsal wall. This is the short segment of mesoderm that connects somite with lateral mesoderm. Three sets of kidneys are formed during embryologic development in vertebrates viz., pronephros, mesonephros, and metanephros. First two sets are temporary structures and third set becomes the kidneys found in the adult.

Introduction

The objective of soil sampling is to obtain reliable information about a particular soil. The value of laboratory data in soil studies largely depends on effective sampling. Soil sampling is one of the most important aspects in the determination of the properties of the soil. Care in preparation and analysis can overcome the damages of careless or inappropriate sampling in the field (Bates, 1993). Errors arising from sampling are mainly related to spatial variability of the soil. While keeping in mind financial constraints, sampling procedures should be adopted properly to minimize the influence of spatial variability and to maximize the accuracy of mean plot values for the measured soil variables. The obtained soil data should be representative for the whole observation plot, taking into consideration the spatial variability of the soil within the plot.

Importance of soil sampling

Soil sampling and testing are done to provide an estimate of the capacity of the soil to supply adequate amount of nutrients to meet the needs of growing crops and information to its nature and problem. Traditionally, the goal of soil sampling is to develop a representative estimate of a field. A few grams of soil are actually used for the laboratory analysis. That small amount must represent the entire area for which the recommendation is to be made. The samples should be collected in such a way that it would represent the area for which recommendation is to be made.

8.1. Classification of essential nutrients

8.1.1. Based on the amount required by the plant

Major nutrients-Required in large quantities eg. N, P, K.

Secondary nutrients-Required in lesser quantities compared to major nutrients eg. Ca, Mg, S.

Micronutrients-Required in trace quantities eg. Fe, Mn, Zn, Cu, B, Mo.

Cropping system is the cropping patterns used on a farm and their interaction with farm resources, other farm enterprises, available technology and environment (Physical, biological and socioeconomic) which determine their makeup (Krantz et al., 1975). Cropping system is subsystem of the farming system.

The cropping system aims at increasing the benefits derived by crop production from available physical resources (land, climate, water resources etc.) that are not readily changed through optimization of input levels for a given crop or cropping pattern. The objective of any cropping system is to increase the efficiency of utilization of resources. The efficiency in measured by the quantity of product obtained per unit resource in a unit time in cropping system.