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مسعود
جوانبخت
author
حسین
غدیری
author
text
article
2000
per
Two greenhouse experiments were conducted to study the Competition between redroot pigweed, broomrape, and potato. The first experiment was a replacement series in which potato and redroot pigweed were planted in different ratios, 4:0, 3:1, 2:2, 1:3 and 0:4, to determine Relative Crowding Coefficient (RCC). RYT> I showed that potato and redroot pigweed exploit the resources in different ways or somehow benefit each other. RCC of potato and redroot pigweed in 2:2 ratio was greater than in other ratios. This indicates that potato• is more aggressive than redroot pigweed. The second experiment was conducted to determine the effect of broomrape seeding rate on potato yield. The treatments consisted of 0, 20, 40, 6() and 80mg seed per pot, and were repeated three times in a randomized complete block design. Potato yield was reduced with increasing broomrape seeding rate. the least potato yield being obtained in pots with 60 and $0 mg broomrape seed.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17176_ff95745f8163f86cb1f9a0e531cfece4.pdf
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محمدرضا
قنادها
author
علی اصغر نصراله نژاد
قمی
author
محمد
ترابی
author
text
article
2000
per
In 1995, five wheat cultivars, one susceptible and four resistance to yellow rust, were inter crossed using a half diallel fashion. In 1996, parents and Fl progenies were planted in a randomized complete block design with three replications. Components of resistance including latent period, pustule size and density, and infection type were evaluated. The results showed significant genetic differences between genotypes, indicating the presence of additive and non-additive effects of gene.’ 11w all characters. Combining ability analysis showed significant, MSgca, Msgca ratio for all characters indicating additive variance to he more important than non-additive variance. The diallel analysis as described by Jinks and Hayman showed that probalbly additive- dominance model can be appropriate and the results showed the presence of partial dominance. Broad and narrow sense heritability estimates ranged from 62% to 98% varieties. Cultivars M-73-3 and M-73-7 were resistant in adult stage and frequency of recessive genes in these cultivars were more than those of dominant genes. Thus, it can he concluded that these cultivars probably have durable resistance.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17177_78d479723bda3a43719bf6c36c21b006.pdf
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احمد
کریمی
author
عبدالحسین
سمیع
author
جواد
پوررضا
author
text
article
2000
per
This experiment was carried out to study the effect of different levels of supplemental Cu(0, 100, 200 mg/kg) and vitamin C (0, 400, 800 mg/kg) on broiler chicks. A total of 360 day old chicks in a completely randomized block design in a factorial arrangement were used. The chickens were divided into 36 groups, 10 chickens per group. four replicates received one of the nine experimental diets. No significant increase in body weight observed due to Vit.C supplementation but added Cu caused an increase in feed consumption, feed conversion and body weight (P
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17178_3e7f6960f6cb8af753ce99bcdb2a4008.pdf
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مصطفی نیک نژاد کاظم
پور
author
عباس شریفی
تهرانی
author
محمود
اخوت
author
text
article
2000
per
Antagonistic fungi, Trichoderma harzianum ( Ti, from bean field in Ahwaz , T2, from tomato field in Karaj), T. viridi (T3, from bean field in Sahriar, T4, from collection of plant pest and Disease Institute Tehran ) were used to control fusarium wilt of tomato incited by Fusarium oxysporum f. sp. lycopersici and their effect on weight and height of tomato plants. The experiment was carried Out in a completeLy randomized design in pot under greenhouse conditions. The results showed that the antagonistic fungi decreased wilt fusariomic disease , 69, 91, 68, 13, 60, 98 and 57, 69 % respectively in respect to inoculation control . The antagonistics in order of efficacy were T2> T1, T3>T4>. Effect of the antagonists on the height and fresh - weight of tomato plant was positive . The use of the antagonists in the non - inoculated soil with the pathogen had low positive effect on the growth (heigh) of the tomato plant.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17179_5e3ef05752b07ddfe84c32c2fc823233.pdf
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ایرج ملک
محمدی
author
غلامحسین حسینی
نیا
author
text
article
2000
per
Although women are recognized as an incredible help in producing agricultural produce all over the world, hut they are rarely served by extension organization. Their rare contact with extension service personnel has caused for them not to be considered in extension system. According to FAQ, about 5% of the total agricultural extension service around the world is conducted to the rural women and only l5% of the advantages from extension services much more and better than men in the similar circumstances. The main focal goal of this research was to study the role of motives in encouraging design was “ cause and comparative” in which 12 personal characteristics and 15 extension education factors for women in fars province who have been participated in extension programs at least once. The sample srown from this population was consisted of 149 randomly selected rural women. Inferential statistics was used to compare means, correlation coefficients between variables. Results taken showed that most of the rural women have been favored with the extension programs. Priority with the extension programs Proroty settings also showed that among the otivates included in this study,” being interested in learning” , “learn new hints” and “proper time uses “were ranked as first to third important factors respectfully. Totally 28 motives were recognized to he influencing in rural women’s participation. Calculating spearman correlation coefficient between motives and women participation in extension programs showed that 11 out of 28 motives were statistically correlated. Based On the findings in this study it was recommended that the proneour rural women along with the female extension agents should be used to apply the extension programs and motivate rural women to participate.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17180_77b59977f25844da870f921e96669652.pdf
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علی اکبر شاه نجات
بوشهری
author
سیروس
عبدمیشانی
author
بهمن یزدی
صمدی
author
بدرالدین ابراهیم سید
طباطبایی
author
text
article
2000
per
With the development of hundreds of commercial soybean varieties, a need for additional variety - specific identifying characteristics has been arisen. For this purpose, twenty - one soybean (Glycine max L.) varieties were elecrophoretically evaluated using polyacrylamide gel and starch gel electrophoresis. Soybean seeds werc analyzed for the banding pattern of seed storage proteins and two enzymatic systems (Esterase and Glutamate Oxalate Transaminase). In this study zymograms were monomorphic but banding
patterns of seed storage proteins, classified cultivars into 4 distinct groups. Therefore, seed storage protein electrophoresis is a more powerful tool to characterize soybean cultivars, compared to isozyme patterns.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17181_d6da1988186552a1f7068d99f0f6f264.pdf
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سهراب
معینی
author
text
article
2000
per
Kilka meat, due to its special taste, is not popular with all people. Other researchers have shown that the water soluble protein and non protein nitrogen have a significant effect on the production of the taste in small fishes. It is possible by washing the fish with cold water to alter their taste according to consumer wishes. So in this study the effect of washing minced flesh of kilka with cold water and brine of 1-5 percent strength on the taste was investigated. The results showed that washing minced flesh of kilka only with cold water did not have any effect on its taste. This result is contradictory to findings of other researchers (4). The extracted water soluble proteins were 0.2 to 2 percent of the total protein of kilka. The results of washing minced flesh of kilka with brine showed if 8 to 10 percent of water soluble protein which is equivalent to 2.4-3 percent of total in kilka meat is extracted by brine, the taste panel can detect some changes in kilka taste. If however the rate of extraction exceeds 16 to 18 percent of total water soluble proteins, which is equal to 4.8-5.4 percent of total protein in kilka meat, there will be a significant improvement in the kilka taste. If the rate of extraction goes beyond 20 percent, 6 percent of total protein in kilka meat, in this case minced kilka flesh would be tasteless and can be suitable for production of different fish products.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17182_4a2bb76448e0d30772d6ec05077b21eb.pdf
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شاهین
واعظی
author
سیروس
عبدمیشانی
author
بهمن یزدی
صمدی
author
محمدرضا
قنادها
author
text
article
2000
per
The efficiency of a breeding program depends mainly on direction and magnitude of association between yield and its components. The purpose of this study was to describe the application ol correlation and path analysis to grain yield (GY) in maize . Six generations including two parents and their prgenies (Fl.F2, BC’I and BC2) were grown in Karaj. Genotypic and phenotypic correlation for GY and its components were calculated. Genotypic and phenotypic correlation for GY and its components were calculated. GY was significantly and positively correlated to the ear weight (EW) , ear circumference (EC), ear diameter, 300-kernel weight (KWT) and number of kernels pr row (NKR). Path analysis for GY showed that KWT and kernel depth (KD) had the highest positive effect on GY However the ED had
negative indirect effect n CY through some traits . It had a positive correlation with GY because of indirect effects through KWT and KD . Path analysis for KWT and NKR showed that ear diameter(ED) had high positive direct on NKR. Sequential path analysis of six trait components studied revealed that KWT had the highest significant effect on GY hut NKR and KW had an indirect effect, through KWT, on GY. The comparison of path analysis with all correlations and sequential path analysis showed that the two methods lead to nearly the same results and altogether KWT and NKR were the most important yield components.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17183_90934198c0f5ab20c7865d7e13b5c974.pdf
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سیامک
رحمانپور
author
جواد
زاد
author
قربانعلی
حجارود
author
text
article
2000
per
During the survey of sunflower fields in Mazandaran province and Gorgan plain between 1995 and 1996, fifty six downy mildew samples from 31 areas were collected. The disease causal agent in these samples , Plasmopara hatstedii,was mass-produced and maintained separately using the whole seedling immersion(WSI)method on susceptible record cultivar. The maintained isolates were inoculated on differential lines received from Canada, according to the proposed-internationally standardized method. The differential lines showed similar reaction, to all isolates tested. Comparison of the reactions of isolates with differential line reactions, in relation to the designated known physiological races, showed that these isolates were different from the existing known races.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17184_c1a24dabe1a23f310413d7f42dba4926.pdf
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بدرالدین ابراهیم
سیدطباطبایی
author
تاکائوکوماتسودا
author
text
article
2000
per
In order to study DNA polymorphism in barley, various STS primer-sets were tested on genomic DNAs of two Japanese barley cultivars. Out of total of 112 primer-sets used, 92 primer-sets generated DNA fragments either in one or both cultivars. Of 92 primer paris, 16 generated polymorphic fragments without using any restriction endonuclease. Twenty four monomorphic bands were converted to polymorphic bands after endonuclease digestion of PCR products with striction enzymes. The restriction sites occured less frequently and they were not evenly spaced out along the DNA fragments indicating that the nucleotides were not randomly ordered. The main reason for polymorphism observed in this study might be attributed to the absence or presence of restriction endonuclease sites.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17185_412871c091f13c1d8d88418befc5ccc0.pdf
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اسداله
میرکریمی
author
text
article
2000
per
In an attempt for integrated control of carob moth Ectomyelois ceratoniae in pomegranate orchards of varamin, mass release of Trichogramma embrphagum egg parasitoid was employed during 1995-1996 in a 5000 m2 orchard. A check plot with the same size (5000 m2) apart from treated orchard was also included for comparison. In each release 100 Tricho-card containing parasitized laboratory reared Ephestia kuehniella eggs were used. Each Tricho-card contained 2000 parasitized eggs. A total of ten mass releases, every 10 days were executed from late May until mid July. Number of adult catches, parasitized eggs and damaged fruits were evaluated statistically. In this investigation, by release of inundative rate of T. embiyopha gum in pomegranate orchards in Varamin, number of adult catches reduced from 20.1 in chcek plot to 10.5 in treated plot. The rate of parasitized eggs increaseld from 17.5% under natural conditions to 53.1 in mass released plot. The rate of damaged fruits at harvest, reduced from 72.20 in check plot to 24.2 in treated plot.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17186_317a1ba2392e38c75d5baf3a3ed9716b.pdf
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رمضان
طهماسبی
author
حسین
فرداد
author
text
article
2000
per
In order to study the effect of irrigation interval on the yield of winter wheat (triticum aestiuum) cultivar Ro-shan an experiment was conducted on the Experimental Farm of the faculty of Agriculture in Karaj in the years 1989-91. Seven treatments, including on irrigation after planting, and the rest six at a 10,30, 40, 60, 80 and 100% of ETm. Et was calcuated on the basis of Blaney and Criddle equation and effective rainfall was estimated using S.C.S method. Irrigation was carried out at 10, 25, 50, 75% soil moisture depletion for each treatment. The results indicated that the amount of irrigation water affected: total biological yield, grain yield, spike length , 1000 grain weight, and other yield factors. Yield varied from 1710 to 2630 Kg ha’. In autumn 1998 all plots were irrigated to field capacity. The plots were next irrigated after depiction of 10, 25, 50 and 75% available moisture. The grain yield was 3384, 3050, 3094 and 2273 Kg/ha respectively. Water consumption effeciency was 1.13, 1.05, 0.82 and 0.86 Kgm3. Grain yield in the second year was 2187, 2630, 2518, 1803, 2136, 1970 and 1710 Kg/ha.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17187_e42f2101ee0db0e75799fcf30d275410.pdf
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احمد
خلیقی
author
محمدرضا
شفیعی
author
text
article
2000
per
Experiments were conducted to study the effect of temperature (0° c, 2°c,4° c, and room temperature), physiological stages of harvesting (open and bud stages ), and chemical treatments (Su , 8-HQ, Ag, STS, and water) on the characteristics of carnation cut flowers, using factorial arrangements. Beijiki standard carnations were obtained from a greenhouse in Mahalat province or grown in the greenhouses of the Department of Horticulture , College of Agriculture , Tehran University, Karaj, Iran. Cut flower longevity , fresh weight and percentage of sucrose were measured and the data statistically analyzed. Silver thiosuiphate at the rate of 500 mg/lit and 8-HQ at 600 mg/lit in combination with 1% sucrose significantly increased the longevity of cut flowers. Flowers were stored best at 2°c with logevity of cut flowers
significantly improved. Interactions were measured and found significant when the flowers were cut at bud-stage kept at 2°c and treated with the STS and
8-HQ.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17188_c5d7ae7dfd63b500695d61388603d3d5.pdf
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عباس
همت
author
حمیدرضا صادق
نژاد
author
رضا
علیمردانی
author
text
article
2000
per
Subsoilers are used primarily to break through and shatter the deep compacted layers, but require very high mechanical energy . There is little information about energy requirement for subsoiling and its effect on soil physical properties in Iran. Therefore, this study was conducted to measure the draft requirement of a single shank, vibrating share subsoiler in vibrating and non - vibrating modes in a silt loam soil and to evaluate the effect of subsoiling on soil physical properties . The experiments were conducted on Iraqi Mahalleh Research Station, Golestan providence, Gorgan, Iran (54 23 E, 36’ 57 N).A randomized complete block design with four treatments (subsoiling at 30 and 40 cm depths with and without applied vibrations) and four replications were used . Draft requirement, specific draft, drawbar power
requirement, wheel slip, forward speed , tractive efficiency , disturbed soil area, clod mean weight diameter, cone penetration index, final infiltration time and rate were measured or calculated. Draft requirement, specific draft, unit draft wheel slip were reduced and tractive efficiency was increased significantly when vibration was applied to subsoiler share. The draft reduction was about 33 %. Due to the increase of soil bulk density with depth, the average subsoiling depth was 35 cm in all treatments. Draft requirements of subsoiler in vibrating and non - vibrating modes at tilling depth of 35 cm and forward speed of 3.9 km h4 and at soil moisture content of 17% (d.b.)were 9.7 and 14.4 kN, respectively. The unit drafts were 277 and 422 N cm4 and the specific drafts were 8.2 and 12.5 N cm2, respectively. The total resultant .disturbed soil area was similar for vibrating and non - vibratingmodes (1859 and 1912 cm2, respectively ). However , the clod mean weight diameter (MWD) significantly decreased with vibrating mode subsoiling (from 10.7cm to 7.4 cm). The subsoiling significantly reduced the average soil strength in the top 35 cm soil layer from. 1.7 to 1.3 MPa, but there was no significant difference between the vibrating and non - vibrating modes. Final infiltration time and rate for vibrating mode were 405 mm and 26 mm h1 and for non - vibrating mode 340 mm and 49 mm h1 were found.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17189_41254b6261f765e0f06192a5c1ec8817.pdf
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فرهاد
قوامی
author
عبدالمجید
رضایی
author
text
article
2000
per
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17190_57ac28ade4ba33bb50c9ea5f9650b633.pdf
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علیرضا
طلایی
author
فرهاد
کرمی
author
حسین
لسانی
author
سعید
رسولزاده
author
text
article
2000
per
The effects of five water stresses (Stress in the 1st stage of fruit growth=SW1, stress the 2nd stage of fruit growth = SW2, stress in the 3rd stage of fruit growth = SW3, stress in the 1st and 2nd stages of fruit growth = SW4 and control plants=SW5) on the vegetative growth as well as fruiting of four peach cvs. (White Mashhad, Red & white Mash had, Red haven and G.H. Hale) were studied. The results indicated that water stress (in SW1, SW2. and SW4 treatments) severely decreased shoot length growth and leaf area in comparison to SW3 and SW5 treatments. There was no significant difference between water stress in stage 3 treatment and control plants. Water stress treatment in 1st stage treatment decreased the fruit density . A significant difference of 1% probability was shown in the 2nd and 3rd stages, and the control plants in water stress treatments. Water stress in the 1st and 2nd stages (SW4) had the highest yield and had a significant difference of 1% probability with water stress treatments in the 2nd and 3rd stages. No significant differences were found for diameter growth, leaf water potentials and flowreing density. This experiment was arranged in a completely randomized block design with splitted plots.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17191_2aa7950f8e0de3d1905f3af3a871f9ac.pdf
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بابک
بهنام
author
بهمن یزدی
صمدی
author
سیروس
عبدمیشانی
author
علیرضا
طالعی
author
علی اکبر شاه نجات
بوشهری
author
text
article
2000
per
Genetic diversity among 20 Iranian barley cultivars (Hordeum vulgare L.) WS investigated using RAPD markers. 950 RAPD fragments were generated using 33 single decameric primers of arbitrary nucleotide sequence. Amplification reactions resulted in fragment ranging in length from 300 to 3000 bps. Clearly resolved bands were scored for the presence or absence in a binary matrix. This matrix was used to calculate a distance matrix based on Nei’s similarity coefficient. Amplified products were treated as independent characters to generate a phenogram using cluster analysis. Cultivars were classified in 6 groups. X2 analysis showed that, there were differences between varieties and primers regarding band generation. The generation of polymorphic band in barley cultivars was successful, and suggested that RAPD marker is suited to study DNA polymorphism in barley.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17192_1eee51760492d9221a4cbb1c0c8cc3f6.pdf
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سید صفدر
حسین
author
سیدعلیرضا بی
نظیر
author
text
article
2000
per
This paper is an analysis of whole - farm support policies along the line of the income stabilization proposed policy for grains (wheat and barley) in Khorasan. Such support policies differ from commodity - specific (i.e. price support) in that, the unit of measurement is the individual farm rather than a unit quantity of commodity. This policy protects all the crops of any producer. Dynamic stochastic simulation method was used to measure the effects of this policy on the income of producers in Khorasan province. S and S criteria, which show the situation of income fluctuations in absence and presence of the proposed policy respectively, have been calculated. The results show that the new policy would decrease the fluctuations in producers’ income form 3 to 27 percent.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17193_7507a2fcdb21f59e044b111f9b0310d5.pdf
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علیرضا طالبیان
مسعودی
author
محمود
شیوازاد
author
علی
نیکخواه
author
هوشنگ لطف
الهیان
author
text
article
2000
per
This experiment was conducted to determine the effects of calcium salts of fatty acids on laying hens performance. The MEn values of fatty acids and calcium salts of fatty acids estimated by biological assay and the regression equations of MEn values of fatty acids and calcium salts on rate of inclusion of fatty acids or calcium soaps in diet were calculated.The MEn of the fatty acids and calcium salts were, 6588 (Kcal/g) and 5760 (KcaI/Kg) respectively. 189 White Leghorn (Hy-Line) layers. 52-wk-old. having similar body weight and egg production. were divided into seven groups with three replicates, fed six diets with different fat source (fatty acids or calcium soaps) and rate of inclusion (1.5%, 3%, 4.5%) or control diet (had nO supplement of fatty acids or calcium soaps). The period of experiment was 12 wk. A randomized complete design with 7 diets, 3 replicate with 9 hens in each replicate was employed to analyse the data. During the length of experiment. 8 variables including: egg weight. Haugh unit, shell weight. percent of shell, egg production, feed consumption. egg mass, were measured and feed conversion ratio were calculated.The obtained results show that: weight, Haugh unit, shell weight and percent of shell of egg were not significantly affected by dietary treatments, but egg production. feed consumption, egg mass and feed conversion ratio were affected (p
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17194_94db6dbe2d6a9b1391dc5def97dafae7.pdf
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خلیل
جمشیدی
author
text
article
2000
per
In order to study the effects of row spacing and plant density on the growth trend and dry weight yield of Chamomile flower (Matricaria Chamomilla) a field experiment was conducted at the research field of Zanjan University in 1998. This experiments was carried out in a split block design with two factors, each in RCB (randomized complete block) design. factor A was row spacing at three levels (30,40 and 50 cm) and factor B was plant spaces or plant spacing within the row (10,15 and 20 cm) each in three replications. Results indicated that decreasing in row spacing and increasing plant spacing within the row lead to an increase in dry weight yield of flower, planting arrangement of 30 10 cm with density of 333000 plant/ha had the highest dry weight yield of flower, there was a significant interaction between the two factors (P5%) for dry weight yield of flower and number of flower per plant but a non significant interactions was observed in the case of plant height
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
31
v.
1
no.
2000
https://jijas.ut.ac.ir/article_17195_dd2dcf44a56bfdb953c0ffbeca702e49.pdf