Notulae cucurbitologicae V     

Igor Grebenščikov 《Genetic Resources and Crop Evolution》1961,9(1):45-57

Summary It is shown in biometrical studies performed for two years and concerning the statistical diversity of fruitshape within one plant having two fruits that fruitshape is inherited as a reaction norm, the mother fruit being without influence on the progeny. The shape of the first fruit is extremely modifiable. Realization of the various fruit shapes is influenced at the end of the vegetative period by the position of the fruit on the plant, by weather, by infection and other environmental conditions. Experiments were done with someCucurbita pepo convar.patissonina Greb. inbred lines of the same origin.

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PEP 1, , . , - , ( ) — , , . , ( ) , . ( ) . ( ) , , , . . , ; (Grebenikov 1960).

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Die Entwicklung der Melonensystematik     

Igor Grebenščikov 《Genetic Resources and Crop Evolution》1953,1(1):121-138

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Notulae cucurbitologicae VI. Über einige Artkreuzungen in der GattungCucurbita     

Igor Grebenščikov 《Genetic Resources and Crop Evolution》1965,13(1):145-161

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肉类加工机刀具制造与修复的新方法     

Rudt.  FY Gut.  MSH 《华中农业大学学报》2000,19(3):292-295

Ｍａｎｙｔｏｏｌｓｓｕｃｈａｓｂｏｎｉｎｇｋｎｉｖｅｓ,ｍｅａｔｍｉｎｃｉｎｇｍａｃｈｉｎｅｃｒｏｓｓｋｎｉｖｅｓａｎｄｇｒａｔｅｓ,ｃｕｔｔｅｒｋｎｉｖｅｓｔｈａｔａｒｅｗｉｄｅｌｙｕｓｅｄｎｏｗａｄａｙｓｉｎｍｅａｔｐｒｏｃｅｓｓｉｎｇｉｎｄｕｓｔｒｙｈａｖｅｌｏｗｓａｆｅｔｙｉｎｄｅｘ.Ｉｎｔｈｉｓｃｏｎｎｅｃｔｉｏｎｉｔｂｅｃａｍｅｎｅｃｅｓｓａｒｙｔｏｉｍｐｒｏｖｅｃｕｔｔｉｎｇｔｏｏｌｓｂｙｉｎｃｒｅａｓｉｎｇｔｈｅｉｒｓａｆｅｔｙ.1　Ｍｅａｔｍｉｎｃｉｎｇｍａｃｈｉｎｅｃｒｏｓｓｋｎ…  相似文献   

Isolation of single human hematopoietic stem cells capable of long-term multilineage engraftment   总被引：1，自引：0，他引：1  

Notta F  Doulatov S  Laurenti E  Poeppl A  Jurisica I  Dick JE 《Science (New York, N.Y.)》2011,333(6039):218-221

Lifelong blood cell production is dependent on rare hematopoietic stem cells (HSCs) to perpetually replenish mature cells via a series of lineage-restricted intermediates. Investigating the molecular state of HSCs is contingent on the ability to purify HSCs away from transiently engrafting cells. We demonstrated that human HSCs remain infrequent, using current purification strategies based on Thy1 (CD90) expression. By tracking the expression of several adhesion molecules in HSC-enriched subsets, we revealed CD49f as a specific HSC marker. Single CD49f(+) cells were highly efficient in generating long-term multilineage grafts, and the loss of CD49f expression identified transiently engrafting multipotent progenitors (MPPs). The demarcation of human HSCs and MPPs will enable the investigation of the molecular determinants of HSCs, with a goal of developing stem cell-based therapeutics.  相似文献   

Cytobrushing of the oral mucosa as a possible tool for early detection of testudinid herpesvirus in Horsfield’s tortoises with nonspecific clinical signs     

Alessandro Vetere  Mara Bertocchi  Igor Pelizzone  Giuseppe F. La Cauza  Laura Denti  Enrico Bigliardi  Francesco Di Ianni 《Journal of veterinary diagnostic investigation》2021,33(1):116

Forty-five Horsfield’s tortoises (Testudo horsfieldii; syn. Agrionemys horfieldii, Russian tortoise) belonging to different owners had decreased appetite and respiratory issues. Twenty-nine tortoises had epiphora, dyspnea, and white necrotic diphtheroid oral plaques (group G1). Ten of the remaining 16 tortoises had serious dehydration, appetite disorder, and depression (G2). The last 6 tortoises had only decreased appetite and moderate conjunctival discharge (G3). During the physical examination of all 45 tortoises, a cytologic sample and an oral swab for herpesvirus and Mycoplasma agassizii PCR testing were taken. In 20 of 29 specimens from G1, in 8 of 16 from G2, and 0 of 6 from G3, the cytologic exam revealed intranuclear acidophilic inclusion bodies, multinucleate cellular syncytia, and further abnormalities caused by herpesviral infection. Moreover, all 45 tested subjects were found to be positive for testudinid herpesvirus 1; 2 were positive for M. agassizii. This prospective study suggests that Horsfield’s tortoises with such signs would benefit from this screening procedure, given that it was effective in a significant proportion of infected and symptomatic animals, and no negative effects were seen.  相似文献   

Über die Schätzung der Heritabilität im weiteren Sinne mit der anschaulichen Methode der Pfadanalyse     

Igor Grebenščikov 《Genetic Resources and Crop Evolution》1978,26(2):293-302

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Notulae cucurbitologicae VII     

Igor Grebenščikov 《Genetic Resources and Crop Evolution》1969,17(1):109-120

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Über verschiedenes genetisches Verhalten der F1-Heterosis- und F2-Abfallindizes bei Kreuzungen von Maisherkünften des Gaterslebener Sortimentes     

Igor Grebenščikov 《Genetic Resources and Crop Evolution》1973,21(1):10-24

Zusammenfassung Auf Grund von Material der 74 randomisierten Maiskreuzungen aus den Jahren 1965/1966 wurden frühere Ergebnisse des Autors (1962) über das Verhalten der F₁-Generationen bezüglich der meisten quantitativen Merkmale nach dem Mitscherlichschen Gesetz vom abnehmenden Ertragszuwachs bestätigt: je größer die absoluten Erträge der Eltern, desto kleiner die relativen Mehrerträge (Heterosiseffekte) der F₁-Generationen; die Korrelationskoeffizienten sind hier signifikant negativ. Dasselbe Kreuzungsmaterial zeigte aber, daß die relativen Mindererträge (Leistungsabfalleffekte) der F₂-Generationen diesem Gesetze nicht folgen, sondern von den absoluten Erträgen der Eltern praktisch unabhängig sind: hier erwiesen sich die Korrelationskoeffizienten als nicht signifikant von Null verschieden.Es wird auf die Ähnlichkeit dieser Korrelationen mit den genotypischen Streuungsanteilen der Abfalleffekte hingewiesen, was für die Brauchbarkeit der Heritabilitätsschätzung aus den Varianzkomponenten spricht.

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On different genetical behaviour of the indices for heterosis in F₁ and for declining in F₂ in crosses between maizes of the Gatersleben collection

Summary Results of 74 random maize crosses from 1965 and 1966 confirmed the author's former results (1962) on the behaviour of F₁ generations in most quantitative characters according to the Mitscherlich law of reducing increase in yield: the higher the absolute yields of the parents, the lower the relative excess in yields (heterotic effects) of the F₁ generations. Here, the coefficients of correlation are significantly negative. The same material, however, proved that the relative decreases in yield (declining effects) of the F₂ generations do not correspond to this law but are practically independent on the absolute yields of the parents : Here, the coefficients of correlation turned out to be not significantly different from zero.The similarity of these correlations to the genotypic components of variance of the declining effects is indicated. This points to the usefulness of estimating heritability by the components of variance.

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F₁ F₂

74 1965–1966 . (1962) , (F₁) : , ( ) F₁; ¶rt; . , ( F) (F₂) , : . ¶rt; ¶rt; , .

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Collateral arteries of the aortic arch of the red-rumped agouti (Dasyprocta leporina Linnaeus, 1758)     

Radan Elvis Matias de Oliveira  Herson da Silva Costa  Hélio Noberto de Araújo Júnior  Igor Renno Guimarães Lopes  Paulo Mateus Alves Lopes  João Vitor de Oliveira Gurgel  Moacir Franco de Oliveira 《Anatomia, histologia, embryologia》2020,49(3):417-424

Detailed knowledge of the arterial system is an important prerequisite when interpreting experimental data in research, as well as in the diagnosis of cardiovascular disease using imaging techniques such as Doppler echocardiography and contrast radiography. Thus, considering the importance of the aortic arrangement, the objective of this study was to describe the collateral arteries of the aortic arch of agoutis in order to establish the standard model, and therefore contribute to studies involving research related to heart disease, and produce information for a more accurate diagnosis in complementary imaging examinations. In this study, 14 adult animals were used, comprising eight males and six females. The vascular system was washed with 0.9% aqueous saline solution and perfused with Neoprene 450 latex coloured with yellow or red pigment, which was subsequently dissected and analysed. One male animal was used for the digital contrast radiography technique perfused with a liquid barium sulphate solution (Bariogel^®) (1 g/ml) and Neoprene 450 latex, both diluted 1/3. The aortic arch of the agouti presented with only the brachiocephalic trunk as collateral branch in all the animals studied. Thus, agouti falls into type 1 for mammalian aortic arch vascular arrangements.  相似文献