23 February 2018

Plant Growth and Development

                      Growth :
• An irreversible permanent increase in size of an organ or its parts or even of an individual cell.
• Growth is accompanied by metabolic process that occurs at the expense of energy.
Plant growth is generally is indeterminate :
• Plants retain the capacity of unlimited growth throughout their life.
• This ability is due to the presence of meristems at certain locations in their body.
• The cells of such meristems have capacity to divide and self-perpetuate.
• The product eventually looses the capacity to divide and differentiated.
• Apical meristems responsible for primary growth of the plants and principally contribute to the elongation of the plants along their axis.
• The lateral meristem, vascular cambium and cork cambium appears later and responsible for the increase in the girth.
Phases of growth :
• The period of growth is generally divided into three phases
o Meristematic.
o Elongation.
o Maturation.
• Root apex and shoot apex represent the meristematic phase of growth.
• The cells of this region are rich in protoplasm, possesses large conspicuous nuclei.
• Their cell walls are primary in nature, thin and cellulosic with abundant plasmodesmatal connection.
• The cells proximal to that region are the phase of elongation.
• Increased vacuolation, cell enlargement and new cell wall deposition are the characteristic of the cells in this phase.
• Further away from the zone of elongation is the phase of maturation.
• The cells of this zone attain their maximal size in terms of wall thickening and protoplasmic modifications.
Condition of growth :
• Water, oxygen and nutrients as very essential element for growth.
• Turgidity of cells helps in extension growth.
• Water also provides the medium for enzymatic activities needed for growth.
• Oxygen helps in releasing metabolic energy essential for growth activities.
• Nutrients are required by plants for synthesis of protoplasm and act as source of energy.
Differentiation, dedifferentiation and redifferentiation :
• The cells derived from root apical and shoot apical meristems and cambium differentiate and mature to perform specific
functions.
• This act of maturation is termed as differentiation.
• During differentiation major changes takes place in their cell wall and protoplasm.
• Differentiated tracheary element cells loose their protoplasm, develop a very strong, elastic lignocellulosic secondary cell walls.
• The living differentiated cells, that by now have lost the capacity to divide can regain the capacity of division under certain condition is dedifferentiation.
• Development of interfascicular cambium and cork cambium from fully differentiated parenchymatous cells is the example of dedifferentiation.
• Cells produced by the dedifferentiated tissues again loose the capacity to divide and mature to perform specific function is called redifferentiation.
PLANT GROWTH REGULATORS :
Characteristics :
• The plant growth regulators are small, simple molecules of diverse chemical composition.
• They could be:
o Indole compounds (indole-3-acetic acid, IAA);
o adenine derivatives (N6-furfurylamino purine, kinetin)
o derivatives of carotenoids (abscisic acid,ABA)
o terpenes (gibberellic acid, GA2)
o Gases (ethylene, C2H4)
• One group of PGRs are involved in growth promoting activities such as cell division, cell enlargement, pattern formation, tropic growth, flowering, fruiting and seed germination. These are called plant growth promoters, e.g. auxin, gibberellins and cytokinin.
• Another group of PGRs play important role in plant responses towards to wounds and stresses of biotic and abiotic origin. They involved in inhibitory responses like dormancy and abscission, e.g. abscisic acid.
Discovery of plant growth regulators :
• Auxin was isolated by F.W. Went from tips of oat seedlings.
The ‘bakane’ (foolish seedling) a disease of rice seedlings, was caused by a fungal pathogen Gibberalla fujikuroi.
E. Kurosawa reported the appearance of the symptom of the disease in uninfected rice seedlings when treated with sterile filtrate of the fungus. The active substance was later identified as Gibberellic acid.
Skoog and Miller identified and crystallized the cytokinesis promoting active substance that they termed as kinetin.
• During mid 1960s three different kinds of inhibitors purified, i.e. inhibitor-B abscission II and dormin. Later all the three proved to be chemically identical and named as Abscisic acid (ABA).
• Cousinsdiscovered a gaseous PGR called ethylene from ripened orange.
Physiological effect of plant growth regulators :
Auxin :
• The term auxin is applied to indole-3-acetic acid
• Generally produced by growing apices of the stems and roots.
• IAA and IBA have been isolated from plants.
• NAA and 2, 4-D (2, 4-dichlorophenoxyacetic acid) are synthetic auxin.
• Promote rooting in stem cutting.
• Promote flowering.
• Inhibit fruit and leaf drop at early stages.
• Promote abscission of older mature leaves and fruits.
• The growing apical bud inhibit the growth of lateral bud, the phenomenon is called apical dominance.
• Auxin induces parthenocarpy.
• Used as herbicides.
• Controls xylem differentiation.
• Promote cell division.
Gibberellins :
• Ability to cause an increase in length of axis is used to increase the length of grapes stalks.
• Gibberellins cause fruits like apple to elongate and improve its shape.
• Delay senescence
• GA3 is used to speed up the malting process in brewing industry.
• Gibberellins promote to increase length of stem in sugar cane.
• Promote early seed production.
• Promote bolting (internodes elongation) in beet, cabbages.
Cytokinins :
• Cytokinins have specific effects on cytokinesis.
• Zeatin isolated from corn-kernels and coconut milk.
• Promote cell division.
• Help to produce new leaves, chloroplast in leaves, lateral shoot growth
• Promote formation of adventitious shoot.
• Cytokinins help to overcome apical dominance.
• Promote nutrient mobilization.
• Delay senescence.
                                             Ethylene :
• Ethylene is a simple gaseous PGR.
• Synthesized in the tissue undergoing senescence and ripening fruits.
• Promote horizontal growth of seedling.
• Promote swelling of axis and apical hook formation in dicot seedlings.
• Promote senescence and abscission of plant organs like leaf and flower.
• Increase rate of respiration during ripening of fruits, called respiratory climactic.
• Breaks seed and bud dormancy.
• Initiate germination.
• Promote rapid internodes elongation.
• Promote root growth and root hair formation.
• Used to initiate flowering and for synchronizing fruit-set.
• Induce flowering in mango.
• The source of ethylene is ethephon.
• Promote female flower in cucumbers thereby increasing the yield.
                                        Abscisic acid :
• Regulates abscission and dormancy.
• Acts as general plant growth inhibitor and an inhibitor of plant metabolism.
• Inhibit seed germination.
• Stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses, hence called as stress hormone.
• Important role in seed development, maturation and dormancy.
• Inducing dormancy, ABA helps seeds to withstand desiccation and other factors unfavourable for growth.
• Acts as antagonist to Gas.
                           PHOTOPERIODISM :
• Some plants require a periodic exposure to light to induce flowering.
• Response of plants in terms of day/night in relation to flowering is called photoperiodism.
Long day plant: plant requires the exposure to light for a period exceeding critical period.
Short day plant: plant requires the exposure to light for a period less than critical period.
Day neutral plant: there is no such correlation between exposure to light duration and induction of flowering response.
• The site of perception of light/dark duration is the leaves.
                               VERNALISATION :
• Vernalisation: There are plants for which flowering is either quantitatively or qualitatively dependent on exposure to low temperature.
• It prevents precocious reproductive development late in the growing season.
• Vernalisation refers to the promotion of flowering by a period of low temperature.




22 November 2017

COUGH(खांसी)

                 खांसी 
श्वसन तंत्र के रोगों में सबसे सामान्य हैं|खासी श्वसन तंत्र में क्षोभ होने या उसमे कोई रोग होने पर होती हैं |यह अपने आप में कोई रोग नही हैं,अपितु होने वाले रोग का लक्ष्ण हैं
कारण –
  • गले में इन्फेक्शन (Infections -such as laryngitis, bronchitis, bronchaictasis)
  •  मौसम में बदलाव/सर्दी (inhalation of cold air, especially in asthmatics, and those with intercurrent infections)
  • TB
  • दमा
  •  निमोनिया
  • श्वसन तंत्र में बही पदार्थो की उपस्थिति (like inhalation of dust, gases, tobacco smoking, compression of air passages, foreign bodies in air passages.)
  •  when a patient has suffered from prolonged illness, in which cough has been a prominent feature, the cough may at times persist as a habit long after the cause has ceased to operate. may be a form of obsessional neurosis or co-ordinated ...from reflux irritation of vagus – (a) wax in external ear or otitis media (b) distension of stomach or rarely of colon. (c) Liver abscess or sub diaphragmatic abscess.

Types of cough

प्रकार –
1)सूखी खासी-इसमें बलगम नही निकलता ,बार बार खासी आती रहती हैं |छाती ,गले व् सिर में दर्द रहता हैं जैसे की DRY PLEURISY में|
२)बलगम वाली खासी/तर खासी –इसमे खासी आने के साथ साथ में बलगम निकलता रहता हैं जैसे की BRONCHITIS में |रोगी की छाती में दर्द नही होता ,पर सर भारी रहता हैं|बलगम निकलने पर रोगी को आराम मिलता हैं |
चिकित्सा-
सामान्य चिकित्सा-
कारण की रोकथाम |
·         लाजिन्जेस चूसने के लिए दें जैसे हाल्स,स्ट्रेप्सिल्स,टस-क्यू |
·         पीने के लिए हल्का गर्म पानी दें
·         कमरे में विश्राम करें
·         धुम्रपान मना करें
·         नमक के पानी या डिस्प्रिन की गोली घोल कर गरारे कराएँ |
·         ग्लेन में मेंडलस पेंट लगायें |
·         ज्यादा मसाले व् तले हुए भोजन न करें
·         पौष्टिक आहार दें |

औषधियां सामान्य संक्रमण में –

सूखी खांसी में-
एक्सपेक्तोरेंट ,एंटीटसीव ,म्युकोलायिटीक-

ये दवाईया श्वसन नली के स्राव को बढ़ा देंती हैं ,जिससे बलगम का गाढ़ापन कम होने से ,वह खासी द्वारा आसानी से निकल जाता हैं |गले में irritation के कम होने से और बलगम के निकलने से मरीज को आराम मिल जाता हैं
·         कुछ दवाईयां तंत्रिका तंत्र में खासी के केंद्र पर काम करके इसकी सहन शक्ति बढ़ा देती हैं |
·         एंटी-हिस्टैमिनिक दवाईयां भी कुछ हद तक खांसी को कम करने में सहायक होती हैं |  
खांसी में प्रयुक्त होने वाले सीरप-
(नोट-बिना रजिस्टर्ड मेडिकल डाक्टर की सलाह के सेवन न करें,यह जानलेवा हो सकता हैं ,किसी भी तरह की हानि के लिए यह ब्लॉग जिम्मेदार नही हैं )
1)syrup.actifed-DM
DOSE-एक चम्मच दिन में तीन बार |


२) syrup-एलेक्स-पी
DOSE-एक चम्मच दिन में तीन बार |

३) syrup.ALEX cough formula 

4) syrup.bronoloax

5) syrup.bro-Zedex

6) syrup.clistin DMR

7) syrup.corex

8) syrup.dilosyn Expectorant

9) syrup.Dristan

10) syrup.solvin expectorant

11) syrup.Alpha-zedex

12) syrup.Asthalin expectorant

13) syrup. Benadryl cough formula

14) syrup.Benituss expectorant

15) syrup.Bromenyl

16) syrup.Grilinctus

17) syrup.Histakof

18) syrup. Koflet

19) syrup. Kofol

20) syrup. Mist Linctus Codeine Co.
इसका प्रयोग बच्चो में न करें |

21) syrup. Phenargan

22) syrup. Phensedyl Linctus

23) syrup. Solvin expectorants

24) syrup. Tixylix

25) syrup. Triamenic



26) syrup. Tus-Q

27) syrup. Zedex

28) syrup. Zeet expectorants

कैप्सूल व् गोलियां –

कैप्सूल-EPHEDREX-N

TAB.TUS-Q

TAB.ट्रॉयमोनिक

TAB.DRISTON

TAB.CODEINE SULPHATE


 Aconite
Alumina
Ambra gresia
Ammonium carb 
Ammonium Mur
Antim tart
Argentum Nitricum 
Arsenic album 
Arsenic album
 Belladonna
Bryonia 
carbo veg 
Causticum 
Chamomilla 
Coccus cacti
Drosera
Dulcamara
Hepar Sulph 
Hyoscyamus 
Ipecauc                   
Kali bi 
Kali carb                                                                                              Phosphorous            
Pulsatilla 
Rhus Tox 
Rumex 
Sambucus Niger 
Spongia .


6 September 2017

NOTES CBSE,ICSE,PMT,IIT

1)ATOMIC STRUCTURE IIT OUESTIONS
ATOMIC STRUCTURE
2)SUBSTITUTION REACTION NOTES BY DR AJAY
SUBS RXN 1
3)ISOMERISM BY DR AJAY
ISOMERISM
4)SUBSTITUTION RE.(2)BY DR AJAY
SUBS
5)SUBSTITUTION REACTION 3 BY DR AJAY
SUBS 3

FOR MORE NOTES PLZ VISIT
Dr.AJAY YADAV

29 March 2017

chemistry notes download for IAS/PCS/PGT

निम्न पर क्लिक कर डाऊनलोड कीजिये |
शीघ्र ही सारे चैप्टर और बुक्स उपलब्ध करा दूंगा |
CHEMICAL KINETICS
ATOMIC STRUCTURE
PHOTOCHEMISTRY
SURFACE CHEMISTRY


25 March 2017

क्या करें सर ....पढ़ने का मूड नही हैं.....

आप एक घने जंगल से होकर गुजर रहे है,अचानक शेर की दहाड़ सुनाई देती है .....आप यह कहने का साहस जुटा सकते हो कि आज मूड नहीं है इसलिए नहीं दौडूगा.....आपको तैरना नहीं आता और आप पानी में डूब रहे हैं,तो आप यह कहने का साहस कर सकते है कि" बचाओ बचाओ " चिल्लाने का मूड नहीं है.........क्या आप civil line या नये यमुना पुल पर घूमने के लिए मूड की इजाज़त लेते हो ??

.

क्या आप शुक्रवार को हिट मूवी का first show देखने के लिए मूड का सहारा लेते हो??.......क्या आप अपनी गर्ल फ्रेंड से बात करने के लिए मूड का सहारा लेते हो......नहीं ना....तो फिर पढ़ाई में हर बार मूड की हेल्प क्यों....??आप कोशिश कर देख लीजिए जब भी आप अपने मूड से पूछेंगे,तो कम से कम आधे दिन आपका मन कहेंगा ....पढ़ने का मन नहीं है,जो असफलता की नींव तैयार करने में मदद करेगा,इसलिए कभी जरूरी काम के लिए मूड की तबीयत ना पूछें.

.

मैंने कई छात्रों से सुना है,मैं डाक्टर बनना तो चाहता हूँ,पर पढ़ने में मन नहीं लगता क्या करूँ....अगर आपने डाक्टर बनने का संकल्प किया है तो इसका मतलब तो यह हुआ ना आपने सबसे कठिन कामों को ,सर्जरियो को,करने का फैसला किया है..........दोस्तों जैसे मन्दिर में पूजा -पाठ करने के लिए पुजारी कभी मूड का सहारा नहीं लेता,शीत ऋतु में बर्फ जैसे ठंडे पानी में सूर्योदय से पहले नहाकर बैठ जाता है,वह यह काम साल के 365 दिन बिना मूड का सहारा लिए हर रोज़ करता है,उसी तरह आपको बिना बहाना बनाएँ अपने काम को लगन से हर रोज़ करना ही करना है .

.

इसलिए मित्रों जो काम जरूरी है,उसके लिए मूड का सवाल भी पैदा नहीं होता.....मूड के आज से ही दास नहीं मालिक बन जाईये......फिर देखिए आपकी AIIMS/KGMC/BHU/AFMC/IITs/NITs की राह कितनी सुगम तथा आसान हो जाती हैं ...

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