eChapters

Observation recording: Today green felling is completely banned. Fuelwood species are managed under clear-felling systems and tree species infected by insects and pests are felled selectively. The students are advised to visit the fuelwood plantations and forests areas where selective felling is going on.

Abstract

FASTA, which stands for “Fast All”, is a sequence alignment tool developed by William R. Pearson and David J. Lipman in 1985. It is commonly used to identify similarities between DNA and protein sequences. FASTA employs a “hashing” strategy to locate matches for short stretches of identical residues with a length of k, referred to as k-tuples or k-tups. This method enables FASTA to quickly search large databases for sequence similarities, making it a popular tool for identifying homologous sequences, predicting gene functions, and analyzing evolutionary relationships. This chapter elaborates some basics of FASTA.

“Curriculum” is seen often as a critical issue during discussions on quality of agricultural education, being considered variously as content, as product and as process. It is easy to make the assumption that a common understanding of curriculum, but in practice this is far from the case, with a host of definitions, approaches and ideological standpoints. Even though a dialogue on curriculum theory is well established, there is still a strong tendency in practice to understand curriculum as a list of content, often developed in considerable detail, that students should be taught.

Cloud usually consists of very small droplets of water which cannot fall appreciably below the cloud base without evaporation. In this condition clouds are stable. Rain drops are about a million times heavier than cloud drops and rain develops only if the cloud droplets grow by some mechanism. Cloud Seeding mechanism depends on the difference in vapour pressure over ice and super cooled cloud, water evaporates of the droplets and migrate to the ice crystal, which grows and begins to fall increasing their growth rate by coalescence with other droplets and eventually melting and falling as rain drops. Presence of ice nuclei determines whether ice crystals form in a supercoold cloud or not. Ice crystals form on naturally occurring nuclei at temperatures of – 10⁰ to 30⁰ C. At warmer temperatures, either the efficient ice-forming nuclei are often deficient in the atmosphere or the cloud may occur with tops supercooled but not to an extent which activates the ice nuclei available. It should be possible to initiate precipitation by introducing ice crystals or by supplying artificial nuclei.

Fig. 25: ICPH 2671 in field

Answer the followings
    Q.1.    What is the different stage of pathogenesis in mastitis?
    Ans.    There are three stages in pathogenesis 
These are as follows:
Invasion: here pathogens move from the exterior of teat to milk inside the teat canal.
Infection: Here pathogens multiply rapidly and invade the mammary gland.
Inflammation: In this stage clinical mastitis occurs with varying degree of clinical abnormalities of milk and udder.
    Q.2.    Of these phases, which phase is important to reduce the incidence of mastitis in control program?
    Ans.    Invasive stage is very important. The incidence of mastitis can be reduced by taking preventive measures at invasive stage by good management and good hygiene practices.
    Q.3.    What are the common abnormalities encountered in udder during mastitis?

Antibiotics are substances which are produced by micro-organisms and which act against micro-organisms. It is also defined as secondary metabolites produced by microorganism, which inhibits the growth of another microorganism. Most antibiotics known uptill now are products of actinomycetes and some are from fungi and bacteria. The use of the antibiotics in managing plant diseases, particlulaty the disease caused by bacteria, mycoplasma and ricketsia, is well demonstrated and are thought to be effective means because of their selective action directed towards causal agents not to the infected host. The mode of action of the antibiotics varies depending on site of action which in turn detrmines their specificity towards given target host (Table 12). Some time mixture of antibiotics are in practice in managing the diseases to reduce delay the chances of resistance development against a particular antibiotic by the causal agent. The most useful antibiotic mixture is streptocycline, which contains streptomycin and tetracycline.

Wall pressure: The inward pressure exerted by the cell wall against expanding protoplast; equal but opposite to turgor pressure.

Warburg effect: Warburg effect states that the competition between CO₂ and O₂ for enzyme RuBisCO with CO₂ promoting photosynthesis and inhibiting glycolate formation and inhibiting photorespiration and O₂ promoting glycolate formation and inhibiting photosynthesis.

Water deficit: Water available to the plant is less than optimum requirement.

Water potential (ψ_w): Water potential is defined as free energy status of water in a system compared to the free energy status of pure water. Here system refers to water in plant cell or soil and pure water refers to the water which does not have any solute in it. Water potential is measured in terms of bars, Pascals or Megapascals and denoted by ψ_w.

Bronzing is a complex nutritional condition in guava (Psidium guajava L.). It manifests in the interveinal tissue of older leaves as bronze or copper colour development, while terminal leaves remain green. This is attributable to the inadequacy of elements P, K and Zn. Bad management and low soil fertility coupled with soil acidity are often due to it.

Bael (Angle marmelos) is an important arid fruits belongs to family Rutaceae and consists 2-3 species of which only one is in cultivation. It is important indigenous fruits of India, drought hardy tree, flowering and fruiting coincides with the onset of monsoon and fruits mature before commencement of summer. The tree shed off entire leaves during hot summer and fruits are exposed to direct sunlight, which favors ripening of fruits.

Observation recording: Now a days green felling is completely banned. Fuelwood species are managed under clear-felling systems and tree species infected by insects and pests are felled selectively. The students are advised to visit the fuelwood plantations and forests areas where selective felling is going on.

Curriculum reorientation is necessary, when any one in use is no longer responsive to the needs, interests and unable to meet the demands of the farming community to which it is intended to serve. In any case a number of factors, such as those listed below, must be taken into consideration while reorientation:

There should be an analytical assessment of the existing agricultural extension curriculum in order to justify any proposed reorientation.

Learning needs of the farm university graduates and farmers should be reviewed from the point of view of both individual learner requirements and national development needs.

To overcome the challenge of popularizing pigeonpea hybrids in the country, it is considered fair enough to compare the hybrid rice with respect to their seed production technology, yield advantages and profitability to the farmers and seed producers. Since both pigeonpea and rice are grouped under self-pollinated crops, this comparison, in the views of authors, may help in encouraging hybrid pigeonpea seed producers and those involved in marketing of hybrid seed.
  
Rice is a highly self-pollinated crop and earlier hybrids were not possible because it was essential that large quantities of hybrid seeds are produced easily and economically. In China, the birth place of hybrid rice, this impossible looking task was accomplished. To launch this program, the Chinese scientists decided to alter the pollination system of rice.

Q.1.    What are the major clinical findings in mastitis?
    Ans.    These are abnormalities of secretions, abnormalities of udder related to size, consistency, temperature and sometimes systemic reactions.

Q.2.    How clinical forms of mastitis could be classified based of severity and duration?
    Ans.    Based on severity it is classified in four forms: Per acute mastitis, acute mastitis, subacute mastitis and subclinical mastitis. However, based on duration it is of three forms: Short term clinical or subclinical mastitis (Coliform mastitis), recurrent mastitis (Staphylococcus aureus mastitis, Streptococcal dysgalactiae mastitis) and persistent clinical or subclinical mastitis (Streptococcus agalactiae mastitis).

Q.3.    What is sub clinical mastitis?
    Ans.    In sub clinical mastitis there is evidence of inflammation which is evidenced by only raised SCC in milk without any visible abnormalities of milk and udder.

As stated before, a careful assessment of the existing curriculum is essential before any modification is undertaken and must take into account the country’s education policy, political, economic, demographic, cultural, social and technological environment. Problems of farmers to be solved, needs to be satisfied, and priorities to be identified and addressed and then only the recommendations made for action.

Xanthan gum: It is a polysaccharide that is produced by fermentation of carbohydrates by a gram-negative bacterium (Xanthomonas campestris) and is a thickening and suspending agent used in pharmaceuticals and prepared foods. It is also called xanthan. Xanthan is a stabilizer produced by Xanthomonas compestris (Plate 671). Xanthan is not hydrolysed or degraded by humans.

Xanthones: It is a group of yellow pigments e.g. mangiferin in mango,

Xanthophyll: Yellow hydroxyl carotene derivative which is present in all green leaves together with chlorophyll and carotene. Xanthophyll is a pigment containing O2 derived from carotene (Plate 672).

Xerophilous: An organism which is thriving in or tolerant to a xeric environment is called xerophilous.

El Nino means ‘The Little One’ or ‘Christ Child’ in Spanish. It was originally recognized by fisherman of the coast of South America as the appearance of usually warm water in the Pacific Ocean, occurring near the beginning of the year i.e. around Christmas. That is why the name is used. El Nino, the periodic warming of Pacific Ocean waters that affects the weather worldwide. C. Fred and T. Andrus of the University of Georgia studied the ancient fish bones from refuse left about 6000 years ago by ancient peoples in Peru and found that ocean catfish lived in water that averaged 60 to 70 warmer than now and that there was little variation in temperature. He concluded that if El Nino was occurring at the modern rate, once every two to seven years, then the bones from the fish would have reflected the temperature variation.