scholarly journals ‘Heterosis’ in litter size of chimaeric mice

1985 ◽  
Vol 46 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Hitoshi Mikami ◽  
Akira Onishi
Keyword(s):  
Litter Size ◽  
The Other ◽  
Mixed Genotype ◽  
Other Hand ◽  
Single Genotype ◽  
The Mean ◽  
Progeny Tests ◽  
And Control

SUMMARYAggregation chimaeras were made from embryos of C57BL/6 and BALB/c mice. Chimaeric and control females were mated with ICR males at 8 weeks of age and their litter sizes were evaluated over a 5-month period after the first mating. Progeny tests showed that 18 of 27 chimaeras produced oocytes of both genotypes. The mean litter sizes of C57BL/6, BALB/c and their F1 crosses (C57BL/6 × BALB/c and BALB/c × C57BL/6) were 8·14, 9·36, 13·38 and 13·40, respectively. The mean for chimaeras was 11·54 and chimaeric heterosis was evident, but it was not as much as heterosis in the F1 When the chimaeras were classified into the mixed and single-genotype progeny chimaeras, chimaeric heterosis was observed only in the mixed-progeny chimaeras. Quantitative GPI analyses in ten organs showed that the degree of chimaerism in the mixed-genotype progeny chimaeras was higher than that in most of the single-genotype progeny chimaeras and that the degree of chimaerism in the ovaries was positively correlated with litter size in the mixed-genotype progeny chimaeras. On the other hand, such correlation was not observed in the single-genotype progeny chimaeras.

scholarly journals Reproductive lifespan in irradiated and unirradiated chromosomally XO mice

1973 ◽  
Vol 21 (2) ◽  
pp. 185-194 ◽  
Author(s):  
Mary F. Lyon ◽  
Susan G. Hawker
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
The Other ◽  
X Rays ◽  
Control Series ◽  
Histological Studies ◽  
Reproductive Life ◽  
The Mean ◽  
And Control ◽  
Human And Mouse

SUMMARYLifetime reproductive performance was studied in 50 sib-pairs of female mice, one member of each pair chromosomally XX and the other XO. Twenty-five pairs were irradiated with 25 rad X-rays at 10 days of age and 25 were unirradiated. In both the irradiated and control series the XO mice had a significantly shorter reproductive life than the XX ones, but unirradiated XO bred longer than irradiated XX. The median age of unirradiated XO at birth of last litter was 280 days and they had 6·5 ± 0·80 litters, whereas for XX the figures were 420days and 12·6 ± 0·74. The mean litter-size of XO mice was only about 55% and their lifetime productivity 34% of that of their XX sibs. Similarly, the lifetime productivity of irradiated XX females was only 31% of that of unirradiated XX. Histological studies showed that in the unirradiated XO mice reproduction ended through shortage of oocytes, and the resulting secondary ovarian changes were similar to those in irradiated mice. Thus, the differences between human and mouse XO types are to some extent reconciled. Both become sterile through death of oocytes, in humans before puberty and in mice after. This difference may be connected with different times from oogenesis to puberty in the two species.

scholarly journals The Effect of Google Classroom Assisted Extensive Listening on Listening Comprehension Accross Learning Autonomy

2020 ◽  
Vol 14 (1) ◽  
pp. 129-142
Author(s):  
Melyann Melani
Keyword(s):  
Foreign Language ◽  
Listening Comprehension ◽  
The Other ◽  
Control Group ◽  
High Learning ◽  
Other Hand ◽  
Efl Students ◽  
The Mean ◽  
And Control

The research aimed at identifying the effect of Google Classroom Assisted Extensive Listening (EL) on English as a Foreign Language (EFL) Students’ Listening Comprehension across Learning Autonomy (i.e., high learning autonomy, and low learning autonomy). The research involved 78 students from two classes, which were divided into the experiment and control group. The experiment class was treated by practicing EL with the support of Google Classroom, on the other hand, the control group was treated by practicing EL by using the traditional platform (written listening journal). The students in each group were further grouped based on their autonomy level (high and low). The result of the research reveals that the mean score of the experiment group is much higher than the control class. It means that students who practiced EL with the support of Google Classroom have better listening comprehension as compared to the students who practiced EL by using the traditional platform. However, the research indicates no interaction from each learning autonomy level with the listening comprehension of both groups. 

Prothrombin Time Standardization: Report of the Expert Panel on Oral Anticoagulant Control

1979 ◽  
Vol 42 (04) ◽  
pp. 1073-1114 ◽  
Keyword(s):  
Prothrombin Time ◽  
Expert Panel ◽  
The Other ◽  
Rabbit Brain ◽  
Calibration Constant ◽  
Freeze Dried ◽  
The Mean ◽  
Point Of Intersection ◽  
And Control ◽  
Standardization Report

SummaryIn collaborative experiments in 199 laboratories, nine commercial thromboplastins, four thromboplastins held by the National Institute for Biological Standards and Control (NIBS & C), London and the British Comparative Thromboplastin were tested on fresh normal and coumarin plasmas, and on three series of freeze-dried plasmas. One of these was made from coumarin plasmas and the other two were prepared from normal plasmas; in each series, one plasma was normal and the other two represented different degrees of coumarin defect.Each thromboplastin was calibrated against NIBS&C rabbit brain 70/178, from the slope of the line joining the origin to the point of intersection of the mean ratios of coumarin/normal prothrombin times when the ratios obtained with the two thromboplastins on the same fresh plasmas were plotted against each other. From previous evidence, the slopes were calculated which would have been obtained against the NIBS&C “research standard” thromboplastin 67/40, and termed the “calibration constant” of each thromboplastin. Values obtained from the freeze-dried coumarin plasmas gave generally similar results to those from fresh plasmas for all thromboplastins, whereas values from the artificial plasmas agreed with those from fresh plasmas only when similar thromboplastins were being compared.Taking into account the slopes of the calibration lines and the variation between laboratories, precision in obtaining a patient’s prothrombin time was similar for all thromboplastins.

scholarly journals Artveillance: At the Crossroads of Art and Surveillance

2009 ◽  
Vol 7 (2) ◽  
pp. 175-186 ◽  
Author(s):  
Andrea Mubi Brighenti
Keyword(s):  
Social Control ◽  
The Other ◽  
Contemporary Society ◽  
Other Hand ◽  
Surveillance Society ◽  
The One ◽  
And Control

In this article I review a series of artworks, artistic performances and installations that deal with the topic of surveillance. My aim is twofold. On the one hand, I want to look comparatively at how different artists interrogate, question, quote, or critise surveillance society. On the other hand, I take these artistic actions as themselves symptomatic of the ways in which surveillance interrogates contemporary society. In other words, my claim is that surveillance does not simply produce substantive social control and social triage, it also contributes to the formation of an ideoscape and a collective imagery about what security, insecurity, and control are ultimately about, as well as the landscape of moods a surveillance society like ours expresses.

Effect on Polymer Chain Structure Caused by the Molar Fraction of 4-Hydroxybutyrate in Poly(3-hydroxybutyrate- co -4-hydroxybutyrate)

2012 ◽  
Vol 602-604 ◽  
pp. 776-780
Author(s):  
Zhi Qiang Li ◽  
Mei Li ◽  
Wei Jia Fan
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Polymer Chain ◽  
Molar Fraction ◽  
Chain Structure ◽  
The Other ◽  
Mean Square ◽  
Polarizing Microscope ◽  
Other Hand ◽  
The Mean

Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)copolymer [P(3HB-co-4HB)] is a kind of biodegradable high molecular polymer produced by bioaccumulation. Because of the good biodegradability and biocompatibility, P(3HB-co-4HB)s have attracted wide attention . At first, the intrinsic viscosity[η] in good solvent of P(3HB-co-4HB) s with varying contents of 4HB was investigated in different temperature. Second, observed the changes of crystallization gathered state caused by the varying contents of 4HB by polarizing microscope. The results show that to the P(3HB-co-4HB)s in same molecular weight, the intrinsic viscosity[η] in good solvent barely changes when the mole fractions of 4HB increase. On the other hand, the mean square end to end distances[0] of macromolecular flexible chains increase with the mole fractions of 4HB. At the same time, the states of aggregation change from spherulites to dendrites. In this investigation, we discuss the reasons of the differences in depth.

Bodily Adornment and Modification in Byzantium

2021 ◽  
pp. 98-116
Author(s):  
Alicia Walker
Keyword(s):  
Visual Culture ◽  
Twelfth Century ◽  
Church And State ◽  
The Other ◽  
Material Sources ◽  
Other Hand ◽  
Byzantine Church ◽  
The One ◽  
And Control

Focusing on Early and Middle Byzantine (fourth-to-twelfth-century) objects, images, and texts, this essay explores the tension between, on the one hand, efforts of the Byzantine church and state to discourage and control bodily adornment and modification and, on the other hand, the extensive evidence of widespread and immoderate engagement with these practices. The enhancement and manipulation of Byzantine bodies is considered as both a real and a metaphoric phenomenon. Evidence culled from secular and sacred, written and material sources demonstrates the importance of bodily adornment and modification to our understanding of Byzantine material and visual culture.

scholarly journals The «I—Other» Relations in One Special Situation of Communication

2015 ◽  
Vol 23 (5) ◽  
pp. 290-306
Author(s):  
A.N. Krichevets ◽  
M.V. Solodushkina
Keyword(s):  
Group Leader ◽  
Self Control ◽  
The Other ◽  
Special Situation ◽  
Other Hand ◽  
The Individual ◽  
And Control

The individual ways of the stutter correction group participants are considered in the article. We see this situation as difficult and even antinomical for participant because it requires the his partial rejection of self-control and a trust in handing over his consciousness to the group leader. We assume that this aspect of communication is expressed only stronger in the situation considered here, but is presented in all kinds of communication. On the other hand, not only psychology, but also our culture lacks in adequate measures for understanding and control of such a processes in the communication. Our analysis of participant’s interviews shows that the participant’s way in the correctional process depends on ones attitudes towards the problem of handing control over one’s condition to the group leader.

scholarly journals THE EFFECT OF THE DOE WEIGHT ON HER REPRODUCTIVE EFFICIENY

2021 ◽  
Vol 22 (1) ◽  
pp. 131-142
Author(s):  
Mohammad Ebrahim Ahmed ◽  
Hussain Yawr Hussain
Keyword(s):  
Growth Rate ◽  
Litter Size ◽  
Conception Rate ◽  
The Other ◽  
Gestation Period ◽  
Reproductive Efficiency ◽  
Litter Weight ◽  
The Third ◽  
Other Hand

Thirty-six local dose have been used and were divided in to three groups sacording to weight, in each group twelve dose. In the first group the weights of the dose were higher than ( 2.5 kgs) and less than (3 kgs). The second groups was higher than 3 kgs) and less than (3.5 kgs). The third group was higher than (3.5 kgs) and less than (4 kgs). The aim of this study was to obtain the effect of doe weight on her reproductive efficiency (gestation period, litter size, litter weight at birth and weaning, growth rate of offspring preweaning, conception rate and preweaning mortility).  The weight of the doe had no significant effect upon the gestation period and this period was 30.9, 31.2, 31.3 days for the three groups respectively, on the other hand the litter size was affected significantly by doe weight and litter size was at birth and preaweaning (5.1 , 5.8 and 6.2), (4.5, 5.3 and 5.7) for the three groups respectively. The offspring weight at birth and weaning was affected significantly by doe weight and this weight was (40.1 , 48.2 and 53.3 gms), (203.6, 227.5 and 233.8 gms) for the three groups respectively while the conception rate was not affected by doe weight. The mortility percentage in the prewaning period was not significantly by doe weight

scholarly journals Adult caddisflies (Trichoptera) attracted to artificial lights in the middle reaches of the Shinano River from 2005 to 2007

Zoosymposia ◽  
2011 ◽  
Vol 5 (1) ◽  
pp. 143-146 ◽  
Author(s):  
KIMIO HIRABAYASHI ◽  
GORO KIMURA ◽  
EISO INOUE
Keyword(s):  
Species Composition ◽  
Air Temperature ◽  
Large Scale ◽  
Abundant Species ◽  
The Other ◽  
Seasonal Abundance ◽  
Other Hand ◽  
The Mean ◽  
Summer Flood

The species composition and abundance of adult caddisflies attracted to the illuminated showcase of a vending machine set along the middle reaches of the Shinano River were investigated every Sunday night from April to November in 2005 to 2007. A total of 1,405 adult caddisflies was collected during the investigation periods. We identified a total of 13 species belonging to 11 genera of 8 families. The most abundant species was Psychomyia acutipennis (Ulmer 1908) each year. Psychomyia acutipennis adults were collected from mid-May to the beginning of October (the range of mean air temperature was 13.8 to 27.7°C), with its seasonal abundance divided into several peaks, i.e., the end of May, the beginning of June, and the end of August to the beginning of September in both 2006 and 2007. On the other hand, in 2005 when there was no large-scale summer flood and there were no marked abundance peaks. The present study suggests that the mean air temperature and summer floods impacted the seasonal abundance of P. acutipennis adults.

Allocation of Responsibility for Product Safety

1995 ◽  
Vol 39 (8) ◽  
pp. 435-439 ◽  
Author(s):  
Kenneth R. Laughery ◽  
David R. Lovvoll ◽  
Michael S. Wogalter
Keyword(s):  
Significant Interaction ◽  
User Study ◽  
Consumer Products ◽  
Product Safety ◽  
The Other ◽  
Product Use ◽  
Other Hand ◽  
High Hazard ◽  
The Mean

Three studies were carried out to explore how people allocate responsibility for safety during product use. In Study 1 29 consumer products were named and subjects apportioned safety responsibility to the manufacturer, the retailer, the user, and a potentially relevant organization not in the stream of commerce (e.g., FDA, CPSC, Underwriters Laboratories). The mean percent responsibility allocated to these four alternatives was 43%, 9%, 27% and 21% respectively. A significant interaction indicated that the allocation varied across products. In Study 2 safety responsibility for the same products was allocated to the manufacturer, retailer and user, but the “outside” organization was omitted. The mean percent allocated was 51%, 20% and 30% respectively. In this study, additional questions assessed various perceptions of the products and the subject's familiarity with the products. The results indicated that responsibility allocation was a function of perception of product hazardousness; the more hazardous a product is perceived to be, the more responsibility is allocated to the user. Study 3 investigated some of the attributes of high hazard products which are associated with various allocations of product safety. For high hazard products with open and obvious risks (chain saws, cutting torches), more responsibility was allocated to consumers as opposed to manufacturers. On the other hand, for those high hazard products with “hidden” risks (pesticides, antifreeze), manufacturers were typically allocated a much higher degree of responsibility.

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