in partial fulfil]ment of the - MSpace - University of Manitoba

More documents

Recommendations

Info

$il\VOLVEMENT OF RETII\OIC ACID II{ - MSpace at the University of ...$

61 RHODOPSI '1-c 1 IS 1 NÀD+ RETI NENE NADH A N LL-TRÀNS RETINENE t1 ÀDH I NÀD+ I ÀLCOHOL DEHYDROGENÀSE vIrÀMINe# NEO_ (1 1-c IS _RETT NOL ) RETINOL I SOMERASE I .t LL-TRANS VITAMIN À ( rR¡Hs-nurr Hor ) Figure 6: Photochemistry of (Àdapted from the visuaJ. cyc1e. Guyton , 1976).
During dark adaptation, a large amount of Vitamin A (retinol) is converted into rhodopsin and reconversion of retinene and opsin into rhodopsin also takes place. Because of these reconversions, the visual receptors (rods) become so sensitive that even a minute amount of light causes excitation. The regeneration of rhodopsin in the retina is dependent on Vitamin A (figure 5). In night blindness, the retina contains less rhodopsin than a normal retina and the rate of regeneration of rhodopsin is much slower, and this condiLion could be reflected on dark adaptation ability of individuals (Guyton, 1976), " 62 The relationship between the ability to see in the dark and Vitamin A status was demonstrated by Dowling and I.iald (1958). Rats were maintained on Vitamin À Ceficient diet. The liver Vitamin À level began to fall steadily within the first week of the start of the Vitamin À deficient diet, within three weeks reached about 5% of the normal value. Then Lhe blood Vitamin À level was depleted and reached 0% which was followed by a depletion in the rhodopsin concentration of the retina. These conditions, fina1ly, resulted in an increase in the visual threshold (final dark adapted threshold), marking the onset of night blindness. Final dark adapted threshold is the minimum amount of light which illuminates a given surface in order to render it visible (Hecht and Mandelbaum, 1939). Final dark adaptaLion threshoLd was defined as the average of three ascending and lhree descending thresholds obtained after 35-40 minutes in the dark (Russel1 et aI., 1973).
Page 1 and 2:
NUTRTTiON SURVEY METHODS: EXPERiENC
Page 3 and 4:
NUTRITION SURVEY I{ETHODS: EXPERIEN
Page 5 and 6:
standardize a 1O-Second Dark Àdapt
Page 7 and 8:
Finally, I wish to thank my wife, s
Page 9 and 10:
.Vítamin A deficiency, a prevalent
Page 11 and 12:
¿. RESUTTS 30 Data Cleaning 30 Des
Page 13 and 14:
LIST OF TÀBIES Table paqe 1. ¿. 3
Page 15 and 16:
tIST OF FIGURES Fiqure '1. Relation
Page 17 and 18:
Chapter 1 INTRODUCTION Malnutrition
Page 19 and 20:
Chapter 2 REVIEI^¡ OF THE TITERÀT
Page 21 and 22:
growth. Measurable growth retardati
Page 23 and 24:
LAND\ \ ÀGRI CULTURÀL PRODUCTION
Page 25 and 26: minimum salaries (indicator of low
Page 27 and 28: Possession of livestock (mirk anirn
Page 29 and 30: the 3rd percentile at about 7 to I
Page 31 and 32: Chavez and Ramirez (1963) also stat
Page 33 and 34: Chapter 3 MATERIÀtS ÀND METHODS 3
Page 35 and 36: 20 3 " 1 ,3 Food Production The siz
Page 37 and 38: 22 (a) egricultural Variables (rood
Page 39 and 40: 24 (E) uealth Variables (HeaIth Sta
Page 41 and 42: 26 3,2 METHODS 3.2.1 Data collecLio
Page 43 and 44: dependent variables. À significanc
Page 45 and 46: Chapter 4 RESULTS 4.1 DATÀ CTEANIN
Page 47 and 48: 32 TÀBtE '1 Age and sex distributi
Page 49 and 50: 34 TABLE 5 Size of land cultivated
Page 51 and 52: 36 TÀBLE 9 Classification of child
Page 53 and 54: 38 4.3 ÀSSOCIATTON OF SOCIO-ECONOM
Page 55 and 56: 40 TABTE 1 2 Effect of socio-econom
Page 57 and 58: 42 important (in the current survey
Page 59 and 60: 44 TABLE 1 5 Effects of child-feedi
Page 61 and 62: 46 TÀBIE 1 7 Age, health and socio
Page 63 and 64: Chapter 5 ÐI SCUSSI ON More childr
Page 65 and 66: Whether or not the child rvas recei
Page 67 and 68: (r=-0.42; p
Page 69 and 70: Chapter 6 CONCLUSION in this study,
Page 71 and 72: crops had significant effects on an
Page 73 and 74: Chapter 7 iNTRODUCTION Vitamin A de
Page 75: Chapter I REVIEW OF LITERATURE 8.1
Page 79 and 80: Classical Dark Àdaptation Test has
Page 81 and 82: 66 centrate on the test light as th
Page 83 and 84: test light. 68 The stimulus consist
Page 85 and 86: 70 TÀBIE 1 9 Comparison of scores
Page 87 and 88: (1977 ). nner using poker chips, ex
Page 89 and 90: there vras a complaint related to n
Page 91 and 92: Chapter 9 MÀTERIAtS ÀND METHODS 9
Page 93 and 94: 10-Second Test were used. in experi
Page 95 and 96: were identified. Errors were reflec
Page 97 and 98: 9.3.3 Experirnent iII 82 Five child
Page 99 and 100: Chapter '10 RESUTTS AND DISCUSSION
Page 101 and 102: 86 Test times of adult subjects Tes
Page 103 and 104: 88 Sources of variability in TÀBIE
Page 105 and 106: (p.0.0001 ), indicating that trial
Page 107 and 108: 92 l1 t6 t5 ^lq v¡ êt3 o H¡Z vt
Page 109 and 110: Decision Procedure, indicating that
Page 111 and 112: 96 10. 3 EXPERIMENT Iii : APPLICÀT
Page 113 and 114: 98 Sources of variabiJ.ity in (1971
Page 115 and 116: For the 7-10 year old group, the me
Page 117 and 118: slight modification was made on the
Page 119 and 120: Chapter '11 CONCTUSiON This study s
Page 121 and 122: In conclusion, Thornton's (1977 ) n
Page 123 and 124: Hakim, P., and Solimano, G., 1978,
Page 125 and 126: Simko, M.0., Cowe11, C. and Gilbrid
Page 127 and 128:
PART II - BIBTIOGRÀPHY Brown, G. C
Page 129 and 130:
Sommer,4., Katz, J., and Tarwotjo,
Page 131 and 132:
QUESTi ONNAI RE Appendix B REPRESEN
Page 133 and 134:
118 ( ) 4. Divorced 18" Mother read
Page 135 and 136:
120 ( ) 4. For poultry purposes ( )
Page 137 and 138:
122 No. of all-owed repl i es : 1 .
Page 139 and 140:
124 ( ) 2. No ( ) 3. Not applicable
Page 141 and 142:
126 86. I^Ihy don't question ) you
Page 143 and 144:
128 108. I,ihat are the foods that
Page 145 and 146:
130 126 " Eco-zones No. of alLowed
Page 147 and 148:
132 I " He i gtrt of chi Id Cen t i
Page 149 and 150:
134 27. What are pregnant ? Months
Page 151 and 152:
Appendix D LiST AND CODES OF STUDY
Page 153 and 154:
Àppendix E LETTER OF PERMiSSION T0
Page 155 and 156:
Appendix F LETTER OF REQUEST Univer
Page 157 and 158:
My telephone number is: 142 Phone 4
show all

in partial fulfil]ment of the - MSpace - University of Manitoba

Create successful ePaper yourself

Delete template?

Save as template?