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Wyszukujesz frazę "crossing" wg kryterium: Temat


Tytuł:
The crossing numbers of certain Cartesian products
Autorzy:
Klešč, Marián
Powiązania:
https://bibliotekanauki.pl/articles/971930.pdf
Data publikacji:
1995
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph
drawing
crossing number
path
Cartesian product
Opis:
In this article we determine the crossing numbers of the Cartesian products of given three graphs on five vertices with paths.
Źródło:
Discussiones Mathematicae Graph Theory; 1995, 15, 1; 5-10
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of crossability of Cuphea lanceolata and C. viscosissima based on pollen tube growth and seed set
Autorzy:
Wojciechowski, A
Olejniczak, J
Adamska, E
Powiązania:
https://bibliotekanauki.pl/articles/2047262.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pollen tube
fluorescence
Cuphea viscosissima
crossing
seed oil
incompatibility
interspecific hybridization
fatty acid
growth
crossability
Cuphea lanceolata
Opis:
Many species of Cuphea genus show promise as rich natural sources of valuable seed oils for commercial utility. Among them are C. lanceolata and C. viscosissima which seed oils contain medium-chain fatty acids. Reciprocal crosses were made between these species to assess their usefulness for Cuphea breeding program. The degree of crossability between C. lanceolata and C. viscosissima was determined by pollen grain germination and pollen tube growth observed using fluorescence microscopy in addition to capsule formation and seed number per capsule. Treatment of the pollen grain with a laser microbeam reduced the number of germinated pollen grains, tubes growth in the pistil and seed set when C. viscosissima plants were used in the crosses as a female form. In the cross C. lanceolata (female form) × C. viscosissima the pollen treatment with a laser microbeam improved pollen tube growth but reduced seed set. Crossability evaluated on the basis of pollen tube growth and seed set showed unilateral interspecific incompatibility in crosses involving C. lanceolata plants as a female form.
Źródło:
Journal of Applied Genetics; 1996, 37, 3; 277-284
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic regulation of alpha-amylase synthesis in rye [Secale cereale L.] grain
Autorzy:
Masojc, P
Stojalowski, S
Lapinski, M
Miazga, D
Powiązania:
https://bibliotekanauki.pl/articles/2047279.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
enzyme synthesis
activity
chromosome
rye
Secale cereale
crossing
alpha-amylase
sprouting line
duplicate gene
addition line
genetic regulation
Opis:
Genetic analysis of two rye interline crosses and a set of wheat/rye chromosomal addition lines was performed to reveal the mechanism underlying wide variation range of alpha-amylase activity in sound grain. The long arm of chromosome 6R was found to be responsible for increased enzyme synthesis during late stages of triticale grain maturation. Only nuclear genes seemed to control alpha-amylase activity, as reciprocal crosses between rye lines showed no maternal effects. Low enzyme activity showed complete dominance over high level of its synthesis. Segregation ratios, observed in F₂ and BC₁ crosses, indicated that recessive alleles at two independent duplicative loci underlie intensive alpha-amylase production.
Źródło:
Journal of Applied Genetics; 1996, 37, 2; 141-152
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transfer of chromosomes of the A and B genomes of wheat to tetraploid rye
Autorzy:
Apolinarska, B
Powiązania:
https://bibliotekanauki.pl/articles/2047251.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chromosome transfer
translocation
rye
substitution
addition
tetraploid triticale
wheat
crossing
hybrid
B genome
A genome
tetraploid rye
Opis:
Tetraploid rye was crossed with different tetraploid triticale lines. The F₁ generation of tetraploid rye × tetraploid triticale hybrids was backcrossed with 4x rye. After backcrossing, all BC₁-F₁ plants were subjected to open pollination, whereas in the BC₁-F₂ generations only plants with wheat chromosomes in their karyotypes were open-pollinated. Substitution, addition and addition-substitution lines of wheat chromosomes in tetraploid rye were isolated from the F₂ and F₃ of BC₁. In 60 plants of BC₁-F₂, 59 chromosomes from the A genome and 9 from the B genome of wheat were recovered. The wheat chromosomes were monosomic except for five plants which were disomic, viz. 1A and 5A in two plants each, and a translocated 3AS/5AL in one plant. In 235 BC₁-F₃ plants, 174 wheat addition and substitution chromosomes were found, 143 from the A genome and 31 from the B genome. All wheat chromosomes except 3A from the A genome and four chromosomes from the B genome - 2B, 3B, 5B and 7B were recovered. The number of substitutions ranged from one to four per plant, only two plants having four. In the group of addition plants the number of added wheat chromosomes ranged from one to two, and in the case of addition-substitution plants — from two to four. Wheat chromosomes occurred in monosomic form, except 10 plants. Six substitution plants were disomic for 1 A, 2A, 5A, 7A, 2B and 3B, respectively. One was disomic for 1A and 5A in two addition plants. Two addition-substitution plants were double disomic: 1A and 5A - in one, and 1A and 3B in the other. In the BC₁-F₃ generation, 23 different translocations were found, four of which occurred between wheat chromosomes and the remaining 19 - between wheat and rye chromosomes. Translocated chromosomes were monosomic, except four plants. Two of them were disomic for 3AS/4RL, one for 4AS/4RS and one for 7AS/7RS. The fertility of both addition and substitution plants ranged from 0 to 38.0 seeds/spike, regardless of the chromosome number, with a mean of 9.61 seeds/spike. Plants with 28 chromosomes showed singnificantly higher fertility than plants with 29 and more chromosomes, except additoion plants with chromosomes 5A and 5B. The analysis of the influence of particular wheat chromosomes on plant fertility showed that both substitution and addition plants with chromosome 6A had the highest average fertility, while plants with chromosome 2B in substitution lines as well as plants with chromosome 2A in addition and addition-substitution lines had the lowest fertility.
Źródło:
Journal of Applied Genetics; 1996, 37, 4; 345-356
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic variability of canker resistance trait in Cupressus sempervirens L. progenies
Autorzy:
Santini, A
Camussi, A
Raddi, P
Powiązania:
https://bibliotekanauki.pl/articles/2046614.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Seridium cardinale
cypress
Italy
canker
genetic variability
crossing
common cypress
early selection
bark canker resistance
Cupressus sempervirens
environment condition
Opis:
The genetic basis of the resistance of the common cypress to Seridium cardinale was investigated in the environmental condition of Central Italy. The cortical canker caused by the fungus affects the common cypress since the 1970’s in Europe and the genetic improvement for the resistance is considered an effective tool to cope with the bark canker epidemics. General and specific combining abilities of thirty mother plants were estimated by means of a North Carolina II mating design including four cypress clones as testers showing divergent degree of canker resistance. The strong differences among testers and general combining effects showed that the character under investigation has an additive genetic control. The best combinations were identified within the families from the crosses with the resistant tester. The results however showed that an early classification of the mother trees, based on a simple unreplicated resistance screening test, is not effective to predict the behaviour in crosses. Replicated screening tests based on morpho-physiological and chemical characteristics are suggested, because the bark canker resistant traits is not sufficiently stable in cypress trees.
Źródło:
Journal of Applied Genetics; 1997, 38, 4; 453-461
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The crossing numbers of products of a 5-vertex graph with paths and cycles
Autorzy:
Klešč, Marián
Powiązania:
https://bibliotekanauki.pl/articles/744243.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph
drawing
crossing number
path
cycle
Cartesian product
Opis:
There are several known exact results on the crossing numbers of Cartesian products of paths, cycles or stars with "small" graphs. Let H be the 5-vertex graph defined from K₅ by removing three edges incident with a common vertex. In this paper, we extend the earlier results to the Cartesian products of H × Pₙ and H × Cₙ, showing that in the general case the corresponding crossing numbers are 3n-1, and 3n for even n or 3n+1 if n is odd.
Źródło:
Discussiones Mathematicae Graph Theory; 1999, 19, 1; 59-69
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza ilosci i wlasciwosci fizykochemicznych miesa mieszancow trzody chlewnej: pbz x duroc, pbz x Hampshire i pbz x Pietrain
Autorzy:
Rudy, M
Zin, M.
Glodek, E.
Powiązania:
https://bibliotekanauki.pl/articles/828287.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
swinia Pietrain
knury
genotyp
ocena jakosci
wartosc rzezna
rasy zwierzat
krzyzowanie towarowe
mieso wieprzowe
wlasciwosci fizykochemiczne
swinia polska biala zwisloucha
swinia duroc
tusze wieprzowe
mieszance
parametry technologiczne
miesnosc
trzoda chlewna
krzyzowanie
otluszczenie
rasy miesne
tucz
wartosc tuczna
swinia Hampshire
Pietrain breed
boar
genotype
quality evaluation
slaughter value
animal breed
crossing
pork
physicochemical property
Polish Landrace breed
Duroc breed
boar carcass
hybrid
technological parameter
meatiness
pig
fattening
degreasing
meat breed
Hampshire breed
Opis:
Celem niniejszej pracy było określenie wpływu genotypu na ilość i jakość mięsa, uzyskanego od tuczników pochodzących z krzyżowania loch rasy pbz z knurami mięsnymi: duroc, hampshire i pietrain. Badania takie uaktualnią również stan wiedzy na temat jakości surowca wieprzowego pozyskiwanego obecnie w zakładach mięsnych, a także pozwolą ocenić w jakim stopniu materiał rodzicielski przekazuje swojemu potomstwu pozytywne geny, dotyczące właściwości fizykochemicznych mięsa. Stwierdzono, że najwyższą mięsność uzyskały tuczniki ♀pbz x ♂pietrain (51,88%), a najniższą ♀pbz x ♂hampshire (49,15%). Najlepszymi możliwościami przetwórczymi pod względem wycieku termicznego i wodochłonności, charakteryzowało się mięso tuczników ♀pbz x ♂pietrain - ilość wody wolnej 21,75%, wyciek termiczny 25,85%, a nieco gorsze parametry technologiczne posiadały mieszańce ♀pbz x ♂hampshire - odpowiednio 23,39% i 27,17%. Najwięcej tusz z mięsem normalnym (mięso bez odchyleń jakościowych) posiadały zwierzęta ♀pbz x ♂duroc (78,95%), natomiast najmniej mięsa normalnego stwierdzono w tuszach uzyskanych od mieszańców ♀pbz x ♂hampshire (66,66%).
The aim of this paper was to ascertain the influence of genotype on the quantity and quality of meat obtained from porkers originating from the hybridisation of sows of pbz breed with meat-boars: duroc, hampshire and pietrain. Such researches also help to update our knowledge on the issue of the quality of pig's raw material obtained in meat - processing plants, and also allows us to ascertain to what degree parental material transfers favourable genes relating to the physicochemical properties of meat to its offspring. It was confirmed, that the highest meat quality was achieved by porkers of ♀pbz x ♂pietrain (51,88%), while the lowest was by porkers of ♀pbz x ♂hampshire (49,15%). The best processing possibilities with respect to thermal outflow and water absorbing capacity, was shown by meat of porkers from ♀pbz x ♂pietrain - quantity of free water 21,75%, thermal outflow 25,85%, while not so good technological parameters were shown by hybrids of ♀pbz x ♂hampshire - 23,39% and 27,17% respectively. Carcasses of animals from ♀pbz x ♂duroc had more of standard meat - 78,95% (meat with no quality deviations) while the least was found in carcasses’ hybrids of ♀pbz x ♂hampshire (66,66%).
Źródło:
Żywność Nauka Technologia Jakość; 2000, 07, 3; 134-144
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wartosci tucznej i rzeznej mieszancow trzody chlewnej: pbz x duroc, pbz x Hampshire i pbz x Pietrain
Autorzy:
Zin, M
Rudy, M.
Znamirowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/827948.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
swinia Pietrain
knury
wartosc rzezna
rasy zwierzat
krzyzowanie towarowe
swinia polska biala zwisloucha
swinia duroc
tusze wieprzowe
mieszance
trzoda chlewna
otluszczenie
krzyzowanie
rasy miesne
tucz
wartosc tuczna
swinia Hampshire
Pietrain breed
boar
slaughter value
animal breed
crossing
Polish Landrace breed
Duroc breed
boar carcass
hybrid
pig
degreasing
meat breed
fattening
Hampshire breed
Opis:
Celem pracy było zbadanie wartości tucznej i rzeźnej potomstwa uzyskanego z krzyżowania towarowego ras: polska biała zwisłoucha (jako materiału matecznego) z knurami ras mięsnych (duroc, hampshire, pietrain). Obecne pogłowie wymienionych ras, a szczególnie polskiej białej zwisłouchej, różni się genetycznie od sztuk hodowanych kilkanaście lat temu w wyniku prowadzonych prac hodowlano-genetycznych. Stwierdzono, że najniższą wartością tuczną charakteryzowały się mieszańce ♀pbz x ♂pietrain, u których średnie dobowe przyrosty w okresie tuczu (614,65 g) były mniejsze o 8,43% od średnich dobowych przyrostów w okresie tuczu (671,23 g) uzyskanych przez mieszańce ♀pbz x ♂duroc. Najmniejszym otłuszczeniem tusz charakteryzowały się mieszańce ♀pbz x ♂pietrain (masa sadła - 1,31 kg, średnia grubość słoniny - 3,06 cm), a największym z grupy ♀pbz x ♂hampshire (masa sadła - 1,75 kg, średnia grubość słoniny - 3,10 cm). Ponadto u mieszańców ♀pbz x ♂pietra in stwierdzono największe umięśnienie tuszy (zawartość mięsa w polędwicy 71,64%, udział mięsa w szynce 72,75%), natomiast tuczniki ♀pbz x ♂hampshire miały najmniejsze umięśnienie (zawartość mięsa w polędwicy 65,63%, udział mięsa w szynce 68,43%).
The aim of this paper was to examine the fattening and slaughter values of offspring obtained from production directed hybridisation of breeds between the white polish droopy ears (being the maternal material) with meat-breed boars (duroc, hampshire, pietrain). Currently existing stock of the above mentioned breeds, especially the white polish droopy ears, differ genetically from those bred some years ago as a result of breeding and genetic experiments. It was observed, that the lowest fattening value was shown by breeds of ♀pbz x ♂pietrain, whose average daily weight increases during the fattening period (614,65 g) was about 8,43% less than the daily average increases during the period of fattening (671,23 g) obtained by breeds of ♀pbz x ♂duroc. The least fat depositions were characteristics of ♀pbz x ♂pietrain breeds (mass of fat - 1,31 kg, average thickness of pork fat from 5 measurements - 3,06 cm), while the greatest was from ♀pbz x ♂hampshire groups (mass of fat - 1,75 kg, average thickness of pork fat from 5 measurements - 3,10 cm). In addition, the highest flesh/meat tissues were confirmed with ♀pbz x ♂pietrain hybrids (content of meat in sirloin was 71,64%, percentage meat content of ham 72,75%). Porkers of ♀pbz x ♂hampshire on the other hand showed the least flesh/meat tissues (content of meat in sirloin - 65,63%, percentage meat content of ham – 68,43%).
Źródło:
Żywność Nauka Technologia Jakość; 2000, 07, 3; 121-133
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł

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