The relative growth of internal organs in light and heavy breeds     

Y. Dror  I. Nir  Zafrira Nitsan 《British poultry science》1977,18(4):493-496

1. The relative weights of the gastrointestinal segments and of some other internal organs from light and heavy breed chicks from hatching to 21 days of age were compared.

2. The relative weight of the duodenum and jejunum was higher in the light breed than in the heavy one, the reverse relationship was found for the ileum and caecum.

3. The relative growth of the pancreas, heart, cerebrum and cerebellum was greater in the light breed.  相似文献   

Metabolic and anatomical adaptations of light‐bodied chicks to intermittent feeding     

I. Nir  Zafrira Nitsan 《British poultry science》1979,20(1):61-71

1. Chicks of a light‐bodied strain were deprived of food on alternate days from 15 to 46 d of age.

2. Hyperphagia, amounting to twice the intake of control birds early in the experiment, occurred on the repletion day.

3. Final body weight attained 80% of that of the controls.

4. Body fat concentration decreased at first but returned to that of controls after 3 weeks.

5. A consistent hyperlipaemia was observed after food deprivation or restoration.

6. There was a marked increase in the digestive enzymes found in the small intestine, but not in the pancreas during the repletion day.

7. These responses may be considered as mechanisms to reduce the physiological manifestations of starvation.  相似文献   

Phagostimulants enhancing the efficacy ofBacillus Thuringiensis formulations against the Giant Looper,Boarmia (Ascotis) Selenaria,in avocado     

J. Meisner  D. Hadar  M. Wysoki  I. Harpaz 《Phytoparasitica》1990,18(2):107-115

In both laboratory and field trials, as well as in semicommercial scale applications, the minimum concentration ofBacillus thuringiensis (B.t.) required to secure satisfactory larval mortality ofBoarmia selenaria could be halved, from 0.5% to 0.25%, by addition of 1% of the commercial phagostimulant Coax. Another phagostimulant product, Gustol, was inactive. Coax did not attract caterpillars from a distance. However, individual, Coax-treated spots on the avocado leaf surface were consumed by the larvae to a significantly greater extent than control. The same difference in palatability was recorded when the spots were treated with a mixture of Coax and aB.t. formulation. This explains, at least partially, the aforementioned advantageous effect of Coax in practical control of the looper byB.t.  相似文献   

Abstracts of papers presented at A meeting of the phytopathological society of Israel on disease-hazards and prospects of container-grown plants     

Y. Chen  Y. Inbar  S. Zilkah  A. Koren  M. Dinar  M. Gokkes  M. Raviv  R. Reuveni  Shlomot Medina  Y. Shamir  Orna Etzion  Orna Duvdevani  Y. Shor  R. Schayer  Ester Hadar  Ruhama Berliner  A. Gamliel  J. Katan  G. Kritzman  Leah Tsror  A. Nachmias  V. Weitsman  D. Mor  Y. Inbar  M. J. Boehm  H. A. J. Hoitink  Y. Hadar  Y. Elad  H. Yunis  H. Volpin  E. Pressman  A. Gamliel  J. Katan  M. Sachs 《Phytoparasitica》1991,19(2):161-170

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Abstracts of papers presented at the second otto warburg symposim on biotechnology: plant - microorganism interaction in the rhizosphere     

A. HüTtermann Marie-Therese Oelbe  E. Fritz  G. Schlechte  A. Bytom  A. D. Jungk  Y. Okon  E. Fallik  Rivka Hadas  S. Sarig  E. Yahalom  Sara Tal  A. Hartmann  B. Kishinevsky  Debora Gurfel  Rina Lobel  Y. Kapulnik  D. A. Phillips  Y. Hadar  Y. Chen  E. Jurkevitch  J. Katan  A. Gamliel  H. Ziegler  I. Chet  A. Ordentlich  Hadar Kless  A. Oppenheim  Avia Zilberstein  D. Holland  J. Berman  A. Zamir  R. Kaufman  N. Bawnik  C. Koncz  J. Schell 《Phytoparasitica》1987,15(2):141-147

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Metabolic and anatomical adaptations of heavy-bodied chicks to intermittent feeding. 2. Pancreatic digestive enzymes.     

Y Pinchasov  I Nir  Z Nitsan 《British poultry science》1990,31(4):769-777

1. Activities of digestive enzymes in meat-type chickens under ad libitum or alternate-day feeding were determined from 14 to 83 d of age. 2. Final body weight of intermittently fed birds attained 75% of that of the ad libitum-fed controls. 3. When compared with the ad libitum-fed counterparts, a marked increase in the relative weight of the pancreas and intestinal contents were found on repletion days. On depletion days the relative weights of the pancreas and of the intestinal contents were about half those found in ad libitum-fed birds. 4. The activity of the digestive enzymes in the pancreas, expressed as U/g pancreas or U/kg body weight, was not affected consistently by the feeding regime. In the small intestine a marked increase in relative activity (U/kg body weight) was observed on repletion days and a marked decrease on depletion days as compared with ad libitum-fed controls. The activities per g intestinal contents following food restoration did not differ significantly from those of ad libitum-fed controls except for trypsin, which was higher in the former. On depletion days the activities per g intestinal contents were lowest, lipase excepted.  相似文献   

Growth and development of the digestive organs and some enzymes in broiler chicks after hatching.   总被引：8，自引：0，他引：8  

Z Nitsan  G Ben-Avraham  Z Zoref  I Nir 《British poultry science》1991,32(3):515-523

1. Body weight and the weight of the digestive organs and activities of some digestive enzymes were determined from hatching to 23 d of age. 2. Relative daily growth rate peaked at 11 d of age (22% gain/d) and then decreased gradually. 3. The vitelline residue was decreased rapidly from 4.6 g at hatching to negligible values from 4 d of age. 4. Maximal allometric growth of the pancreas and small intestine was 4-fold and that of liver 2-fold greater than that of the body. 5. Activities (units/kg body weight) of the digestive enzymes measured in the pancreas and intestinal contents increased with age. In the pancreas maximal values were attained on day 8 for amylase and lipase and 11 for trypsin and chymotrypsin. In the small intestine maxima were attained on day 4 for lipase, 11 for trypsin and chymotrypsin and 17 for amylase. 6. The development of secretion of digestive enzymes in the post-hatched chick could be a limiting factor in digestion and subsequently in food intake and growth.  相似文献   

Efficient near-infrared polymer nanocrystal light-emitting diodes     

Tessler N  Medvedev V  Kazes M  Kan S  Banin U 《Science (New York, N.Y.)》2002,295(5559):1506-1508

Conjugated polymers and indium arsenide-based nanocrystals were used to create near-infrared plastic light-emitting diodes. Emission was tunable from 1 to 1.3 micrometers--a range that effectively covers the short-wavelength telecommunications band--by means of the quantum confinement effects in the nanocrystals. The external efficiency value (photons out divided by electrons in) is approximately 0.5% (that is, >1% internal) and is mainly limited by device architecture. The near-infrared emission did not overlap the charge-induced absorption bands of the polymer.  相似文献   

Influence of time of harvest and maturity index on olive oil yield and quality     

Arnon Dag  Zohar Kerem  Nir Yogev  Issac Zipori  Shimon Lavee  Eric Ben-David 《Scientia Horticulturae》2011

Harvesting plays a major role in the virgin olive oil production line, being the most expensive single component, but also due to its significant effect on the whole year's produce. Previous studies have focused on the effects of harvest timing on either oil yield or quality. Here we determined the separate and combined effects of harvesting date, fruit maturation, cultivar and fruit load on olive oil quality and quantity. Cultivars typical to the Middle East region were selected: the traditional cv. Souri and the newer cv. Barnea, grown under intensive conditions. The results demonstrate fundamental differences between the two cultivars with respect to harvest strategy. In high-yielding ‘Barnea’, oil accumulation continued throughout the ripening season resulting in increasing yield of oil with time while maintaining high quality. Hence, exploiting the production potential in ‘Barnea’ requires late harvest and advanced fruit maturity. However, in heavily loaded ‘Souri’, oil accumulation was accompanied by early massive shedding of fruits. Furthermore, late harvest and advanced maturation in ‘Souri’ were associated with a sharp increase in free fatty acids combined with a rapid decline in polyphenol content, and in MUFA to PUFA and saturated to unsaturated fatty acid ratios, all resulting in loss of oil quality. Rapid decline in oil yield coupled with deterioration of oil quality call for early harvesting at low maturity index in ‘Souri’. In medium-yielding trees of both cultivars, maturation progressed more rapidly, resulting in earlier harvest to utilize optimal oil potential.  相似文献   

Use of a self-expanding metallic stent for the treatment of a urethral stricture in a young cat     

Hadar EN  Morgan MJ  Morgan OD 《Journal of Feline Medicine and Surgery》2011,13(8):597-601

A 4-month-old intact male domestic shorthair cat was evaluated for urinary outflow obstruction after several weeks of medical management for traumatic urethral rupture. Positive-contrast retrograde urethrography and anterograde cystoscopy performed 4 weeks after the initial urethral injury confirmed a stricture approximately 1cm distal to the bladder trigone at the site of the initial urethral tear. A self-expanding metallic urethral stent (SEMS) was placed under fluoroscopic guidance to relieve the urethral stricture and re-establish luminal patency. After stent placement, the cat was able to void urine normally with minimal urinary incontinence noted. This resolved several months post-stent placement. No known clinical complications persisted other than mild intermittent hematuria.  相似文献