scholarly journals Apparent mitogenetic inactivity of active cells

1933 ◽  
Vol 114 (786) ◽  
pp. 1-9 ◽  
Keyword(s):  
Sufficient Accuracy ◽  
The Other ◽  
Mechanical Activity ◽  
High State ◽  
Powerful Source ◽  
Embryonic Tissues ◽  
Yeast Cultures ◽  
Other Hand ◽  
A Cell ◽  
Positive Results

The emission of mitogenetic rays has been reported from a great variety of cells and tissues but the most powerful source appears to be material which is in a high state of mitotic, metabolic, nervous or mechanical activity (Gurwitsch, 1932). A cursor survey of the literature shows that there is no general agreement concerning the reality of the phenomenon. In most cases, neither the source of the rays nor the means adopted for their detection has been defined with sufficient accuracy to permit consistent results to lie obtained by independent workers. To some extent this difficulty has been met by using photo-electric cells as a means of detecting the rays. Using a potassium cell, Schrieber and Friedlich (1930) failed to detect any radiation know yeast cultures. Seyfert (1932) using a cell of the counter type failed to find any emission of rays from onion roots, yeast cultures, and embryonic tissues. Frank and Rodionov (1932) on the other hand, obtained positive results from active preparations of the frog's sartorius and heart.

English Aspiration and Flapping Revisited

1984 ◽  
Vol 29 (1) ◽  
pp. 42-57 ◽  
Author(s):  
Marc Picard
Keyword(s):  
The Other ◽  
Additional Problem ◽  
Other Hand ◽  
Metrical Analysis ◽  
Positive Results ◽  
Phonological Rules

In Kahn (1976), one finds a syllable-based reanalysis of certain well-known phonological rules of English. Prominent among these are aspiration and flapping. Given that the belated recognition of the syllable by generative phonologists has generally yielded very interesting and positive results, this reinterpretation of the facts must be seen as a welcome development in that respect.On the other hand, however, Kahn’s decision to base his syllable-oriented generalizations on the concept of ambisyllabicity must be seriously questioned since the phonological evidence for such a phenomenon is so tenuous, and also because this concept is virtually unfalsifiable as it is not known to have any physical-acoustic or articulatory-correlates whatsoever.Also, over and above Kahn’s recourse to such an unsubstantiated mechanism, there is the additional problem that the two rules he proposes simply do not correctly account for all the data. A later attempt by Kiparsky (1979) to replace Kahn’s ambisyllabic treatment of these two rules by a metrical analysis involving the foot runs into exactly the same kind of trouble.

Estimation of Aflatoxin in Corn by “Dockage” Assay

1969 ◽  
Vol 52 (6) ◽  
pp. 1304-1306 ◽  
Author(s):  
Robert M Johnson ◽  
Walter T Greenaway ◽  
William P Dolan
Keyword(s):  
Uv Light ◽  
The Other ◽  
Foreign Material ◽  
Other Hand ◽  
Tlc Plates ◽  
Quantitative Results ◽  
Positive Results ◽  
Ground Corn

Abstract A method of analyzing corn for aflatoxin was developed by assaying only the broken corn, foreign material, and chaff (dockage). Only 1 out of 21 commercial ground corn samples to which corn containing aflatoxin was added gave positive results for aflatoxin. On the other hand, all “Dockage” portions sieved from these same samples gave positive results. The procedure consists of streaking corn extracts on preparative coated sheets for cleanup, separation, and identification. If quantitative results are desired, fluorescent areas are collected and spotted on TLC plates for identification under UV light.

The diversity of inflectional periphrasis in Persian

2014 ◽  
Vol 51 (2) ◽  
pp. 327-382 ◽  
Author(s):  
OLIVIER BONAMI ◽  
POLLET SAMVELIAN
Keyword(s):  
General Framework ◽  
Point Of View ◽  
The Other ◽  
Inflectional Morphology ◽  
Formal Grammar ◽  
Conjugation System ◽  
Testing Ground ◽  
Other Hand ◽  
Different Types ◽  
A Cell

Modern Persian conjugation makes use of five periphrastic constructions with typologically divergent properties. This makes the Persian conjugation system an ideal testing ground for theories of inflectional periphrasis, since different types of periphrasis can be compared within the frame of a single grammatical system. We present contrasting analyses of the five constructions within the general framework of a lexicalist constraint-based grammatical architecture (Pollard & Sag 1994) embedding an inferential and realizational view of inflectional morphology (Stump 2001). We argue that the perfect periphrase can only be accounted for by assuming that the periphrase literally fills a cell in the inflectional paradigm, and provide a formal account drawing on using valence for exponence. On the other hand, other periphrastic constructions are best handled by using standard tools of either morphology or syntax. The overall conclusion is that not all constructions that qualify as periphrastic inflection from the point of view of typology should receive the same type of analysis in an explicit formal grammar.

The development of embryos in the uteri of mice treated with actinomycin D before implantation

Development ◽  
1975 ◽  
Vol 34 (2) ◽  
pp. 429-434
Author(s):  
C. A. Finn ◽  
J. C. S. Bredl
Keyword(s):  
Actinomycin D ◽  
Giant Cells ◽  
The Other ◽  
Functional Connection ◽  
Embryonic Tissues ◽  
Other Hand

This investigation follows the development of embryos in the uteri of mice in which the differentiation of the implantation chamber has been retarded by the administration of actinomycin D before implantation. For the first 48 h after the induction of implantation both embryonic and extra-embryonic parts of the blastocyst develop, but after 72 h the embryonic parts cease to grow and die. The giant cells and other extra-embryonic tissues, on the other hand, continue to develop for a much longer period, up to 288 h. It is suggested that the actinomycin D, by delaying the formation of the implantation chamber in the endometrium, interferes with the formation of a proper functional connection between the trophoblast and endometrium with the result that the embryo receives insufficient nutrition for its development.

Ausfall der Potenz zur Borstenbildung als „Erbmerkmal“ einer Zellkultur von Drosophila melanogaster

1965 ◽  
Vol 20 (4) ◽  
pp. 290-292 ◽  
Author(s):  
Ernst Hadorn
Keyword(s):  
Drosophila Melanogaster ◽  
Cell Line ◽  
The Other ◽  
Ground Pattern ◽  
Other Hand ◽  
A Cell ◽  
Developmental Factor ◽  
One Year ◽  
Cuticular Structures

The occurrence and the manifestation of a cell line is described which had suddenly and irreversibly lost the potency for forming bristles on any part of the adult cuticle after culturing in vivo over a period of more than one year. On the other hand, it is shown that the cells maintained the capacity for the differentiation of the region-specific ground pattern which consists of hairs and other cuticular structures and which characterize antennae, head parts, legs, wings and the thorax. The aristae are not affected by the change which initiated the bristle-less cell line. Thus it is concluded that the aristae are formations belonging to the ground pattern. A general developmental factor which is indispensible for and common to all bristles regard-less of their organspecific structure is postulated.

Modeling the redox potential during the infiltration in a recharge pond located in the Llobregat river basin

2020 ◽  
Author(s):  
Paula Rodriguez-Escales ◽  
Carme Barba ◽  
Xavier Sanchez-Vila ◽  
Albert Folch
Keyword(s):  
Redox Potential ◽  
Heat Transport ◽  
The Other ◽  
Geochemical Processes ◽  
Aquifer Recharge ◽  
Non Invasive ◽  
Other Hand ◽  
Multiple Processes ◽  
A Cell ◽  
Llobregat River

<div> <p>Redox potential measurements are a sink of multiple processes and factors related to the hydrochemistry of a water.  Normally, by themselves, they do not provide enough information to describe all the processes occurring in a system and they are considered only as “an indicator” that combined with a more detailed hydrochemistry can provide information of the driving processes. There are different reasons why these measurement are not quantitatively valid. First of all, sampling plays an important role. The most common method to determine Eh in groundwater is by using an Eh probe and a cell flow, which implies, by itself, mixing of waters. On the other hand, the Eh reproducibility is also conditioned by the amount of processes considered in a numerical model. Eh depends on several geochemical processes, which at the same time, they are depending on flow and heat transport. The last achievements in sensoring science has allowed to develop sensor probes that allows the Eh measurements in a non-invasive and a continuous way.</p> </div><p>Considering this, in this work we have monitored intensively an infiltration pond (in the context of Managed Aquifer Recharge) in order to develop a proper model to reproduce the Eh. The monitoring was based in the use of non-invasive Eh probes, which registered the Eh every 15 min during a year. During that year, four hydrochemical campaigns were also developed in order to quantify the hydrochemistry of the site. On the other hand, the model considered the flow of the system, the heat transport and a set of geochemical processes which were also depending on temperature. The main processes were the generation of organic matter in the own system, the oxidation of organic carbon using different TEAPs, nitrification and different secondary geochemical processes related, specially, to iron and manganese geochemistry.</p>

Immunity in trypanosomiasis

Parasitology ◽  
1964 ◽  
Vol 54 (3) ◽  
pp. 585-591 ◽  
Author(s):  
M. A. Soltys
Keyword(s):  
The Other ◽  
Practical Application ◽  
Freezing And Thawing ◽  
Negative Results ◽  
Other Hand ◽  
Protective Antibodies ◽  
Freund’S Adjuvant ◽  
Freund's Adjuvant ◽  
Positive Results ◽  
Better Than

Success in immunizing rabbits, rats and sheep with dead trypanosomes depends on the method of killing trypanosomes, the frequency of inoculations, and the strain used for immunization. Positive results were obtained when trypanosomes were killed by formalin or by freezing and thawing five times. Negative results were obtained when trypanosomes were killed by 56° C. for half an hour.Animals which received 10 doses of the mixture produced better results than those which received the same amount but only in 2 doses. An addition of Freund's adjuvant improved results, but 10 doses without an adjuvant were still better than 2 doses with an adjuvant. When trypanosomes were killed by 0·5% formalin, only an M variant of T. brucei, which was maintained by frequent passage in mice and was an antibody-sensitive variant, was able to produce in animals protective antibodies and resistance to a homologous ‘M’ variant, but not to an ‘R’ variant. On the other hand, if an ‘R’ variant of the same strain, which was passaged forty-eight times through rabbits and became resistant to antibodies, was killed by 0·5 % formalin and inoculated into animals, no antibodies and resistance could be demonstrated to a homologous ‘R’ variant and an ‘M’ variant.Although it is possible to produce immunity in animals with dead trypanosomes further studies, particularly in the field, are necessary to find its practical application.

scholarly journals Occurrence of Campylobacter on carcasses of slaughtered animals between 2009 and 2013

2014 ◽  
Vol 58 (4) ◽  
pp. 553-558 ◽  
Author(s):  
Kinga Wieczorek ◽  
Jacek Osek
Keyword(s):  
The Other ◽  
Pork Meat ◽  
Other Hand ◽  
The Mean ◽  
Positive Results

Abstract A total of 2668 swabs from poultry (n = 2166), pig (n = 311), and cattle (n = 191) carcasses were collected in slaughterhouses all over Poland and tested for the presence of Campylobacter. It was found that 1319 (49.4%) of them were contaminated with these bacteria. The percentages of the positive samples were different in each year of the study and the highest proportion of Campylobacter contaminated samples occurred in 2009, when 64.1% of investigated carcasses were positive. On the other hand, the lowest prevalence of Campylobacter was observed in 2013, in the last year of the survey. In all kind of carcass samples both C. jejuni and C. coli were identified, although the pork meat was more contaminated with C. coli (75.3% of positive samples) than with C. jejuni (24.7%), whereas poultry was nearly equally positive for C. jejuni and C. coli (50.6% and 49.4% respectively). The analysis of seasonal contamination of the carcasses revealed that more positive results were found during the second half of year than between January and June. The prevalence of Campylobacter showed that in all provinces, except one (Pomorskie), the mean percentage of the positive samples was above 40%. The most contaminated samples were identified in Lubelskie (69.3%) and Zachodniopomorskie (66.3%) regions. The obtained results showed that slaughtered animals in Poland, especially broilers, were often contaminated with Campylobacter, either C. jejuni or C. coli.

scholarly journals A Notion of Inversion Number Associated to Certain Quiver Flag Varieties

10.37236/7840 ◽  
2018 ◽  
Vol 25 (3) ◽  
Author(s):  
Lucas Fresse
Keyword(s):  
Algebraic Variety ◽  
Projective Variety ◽  
Smooth Projective Variety ◽  
Cell Decomposition ◽  
The Other ◽  
Flag Varieties ◽  
Other Hand ◽  
Inversion Number ◽  
A Cell ◽  
Nilpotent Endomorphism

We define an algebraic variety $X(d,A)$ consisting of matrices whose rows and columns are partial flags. This is a smooth, projective variety, and we describe it as an iterated bundle of Grassmannian varieties. Moreover, we show that $X(d,A)$ has a cell decomposition, in which the cells are parametrized by certain matrices of sets and their dimensions are given by a notion of inversion number. On the other hand, we consider the Spaltenstein variety of partial flags which are stabilized by a given nilpotent endomorphism. We partition this variety into locally closed subvarieties which are affine bundles over certain varieties called $Y_T$, parametrized by semistandard tableaux $T$. We show that the varieties $Y_T$ are in fact isomorphic to varieties of the form $X(d,A)$. We deduce that each variety $Y_T$ has a cell decomposition, in which the cells are parametrized by certain row-increasing tableaux obtained by permuting the entries in the columns of $T$ and their dimensions are given by the inversion number recently defined by P. Drube for such row-increasing tableaux.

scholarly journals STUDIES ON THE FILTRABILITY OF BACTERIUM GRANULOSIS

1931 ◽  
Vol 54 (4) ◽  
pp. 557-565 ◽  
Author(s):  
P. K. Olitsky ◽  
R. E. Knutti ◽  
J. R. Tyler
Keyword(s):  
Inclusion Bodies ◽  
The Other ◽  
Etiological Agent ◽  
Other Hand ◽  
Vast Literature ◽  
Positive Results ◽  
Experimental Disease

The evidence hitherto reported concerning the filtration of trachomatous material, and inoculation of man and monkeys with the filtrates points to the conclusion that the incitant of trachoma is not, as a rule, filtrable. Our findings confirm this view and indicate further that no virus causing the disease is adsorbed to Bacterium granulosis. On the other hand, Bacterium granulosis itself in heavy suspensions is irregularly filtrable through Berkefeld V candles, like some other bacteria (14), but it is present in the filtrates in only small numbers. When suspensions were used of trachomatous human and monkey tissues, which contain much fewer organisms than do actual cultures, Bacterium granulosis was never recovered from the filtrates. The conception that trachoma is a disease caused by an ultramicroscopic virus is based on (a) the positive results of filtration in two animals, as reported by Nicolle and his coworkers, and (b) the presence of so called "inclusion bodies" in some of the cells of the lesions. One can state definitely that the evidence is now greatly against the filtrability of the etiological agent of trachoma. Furthermore, filtrability does not in itself suffice for the classification of an agent as an ultramicroscopic virus. Concerning (b), a vast literature has accumulated which indicates that the "inclusion bodies" of trachoma are not specific for the disease and that the bodies themselves may be bacterial in origin (15). We have not as yet found bodies of the kind characteristic of many filtrable viruses in the tissues of man or of monkeys with the experimental disease.

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