scholarly journals Frequency of Vibrio cholerae in the Water and Plankton Samples of South- Western Coastal Aquatic Habitats of Bangladesh

2012 ◽  
Vol 36 (1) ◽  
pp. 71-78 ◽  
Author(s):  
Md Mansurul Haque ◽  
Munirul Alam ◽  
Abdus Salam

Monthly environmental surveillance was carried out for three consecutive years in the coastal aquatic habitats of Mathbaria, with a view to assessing the culturability and abundance of V. cholerae. The study revealed that 93 samples (29%) out of 324 were positive for V. cholerae O1 on TCBS and TTGA culture media but no sample was found positive for V. cholerae O139 in the same culture media. On the other hand, all the water and plankton samples were found positive for V. cholerae O1 and O139 in DFA counting technique. Similarly, V. cholerae non-O1 and non- O139 were detected from all samples through culture methods throughout the investigation period.   V. cholerae O139 has been found to be absolutely non-responsive to artificial enrichment and culture media with the advancement of time. Therefore, water and plankton samples can also be concluded to be the additional reservoir of V. cholerae DOI: http://dx.doi.org/10.3329/jbas.v36i1.10922 Journal of Bangladesh Academy of Sciences, Vol. 36, No. 1, 71-78, 2012

2020 ◽  
Vol 6 (1) ◽  
pp. 117-143
Author(s):  
Hartmut Walravens

The paper documents the relationship between the inventor, printer and collector of Oriental books P.L. Schilling von Canstadt and the Orientalist J.P. Abel Rmusat by means of their extant correspondence. The bibliophile with a splendid Oriental library was a welcome partner and correspondent as he could and often would help colleagues with his rarities not to be found anywhere else in Europe. His expertise in printing Oriental scripts was attractive, too, as Orientalists were in need of adding Oriental scripts to their publications. Rmusat, on the other hand, wrote evaluations for the Petersburg dictionary project and publicized Schillings Chinese publications as models of perfect printing art. There is also a memo from Fr. Gass to Schilling, which gives some details about their printing experiments.


1996 ◽  
Vol 59 (1) ◽  
pp. 96-101 ◽  
Author(s):  
ANWARUL HUQ ◽  
RITA R. COLWELL

The observation that directly-detectable bacterial cells are unable to grow on bacteriological culture media under certain conditions raises questions regarding the viability of these cells. Various terminologies have been used to describe substrate-responsive and metabolically-active bacterial cells that cannot be cultured. The currently-accepted term is “viable but nonculturable.” During the past 15 years, the viable but nonculturable phenomenon has been actively investigated. Bacterial pathogens in the viable but nonculturable state can maintain virulence and produce disease. These organisms may escape detection if bacteriological culture methods are solely used. Thus, methods for direct detection of specific pathogens in food, water and environmental samples are preferable. Viable but nonculturable Vibrio cholerae have been extensively studied, and several sensitive and reliable direct-detection kits have been developed. Viable but nonculturable forms of bacteria are now recognized as a common phenomenon, observable in many bacterial species, which suggests that standard bacteriological laboratory protocols for assessing microbiological safety of food and drinking water are less reliable than direct detection methods.


1980 ◽  
Vol 58 (8) ◽  
pp. 997-1000 ◽  
Author(s):  
Jacques De Buyser ◽  
Yves Henry

Three culture media, including one from potato extracts, have been compared. It is shown that glutamine and the potato extract medium increase the frequency of embryos produced from anther cultures. On the other hand, the extract medium is characterized by (1) the earlier formation of embryos; (2) better embryos which most often have meristematic initials; and (3) an increase in the rate of haploids. [Journal translation]


Author(s):  
Muratov Abdushukur

Over the centuries, the territory of what is now Uzbekistan has been one of the well-developed scientific, educational and spiritual centers of the world. Its history and thousands of manuscripts in the funds of the country confirm that it has produced many scholars on the one hand, and on the other hand, these scholars have paid special attention to science. A large part of manuscripts in the funds of the country is devoted to Islamic sciences such as Tafsir, Hadith, Fiqh, Kalam, Balagha, Logic and Arabic linguistics. One of these manuscripts is Abu Khafs Nasafi’s (467-537/1074-1142) work “Al-Taysir fi `Ilm al-Tafsir”. The manuscript is devoted to the Science of Tafsir and contains of five volumes. Seven manuscript copies of this work are stored in the Fund of the Institute of Oriental Studies named after Abu Rayhan Biruni under the Academy of Sciences of the Republic of Uzbekistan. A scientific analysis of these sources confirms that these copies were not fully saved. Manuscript copies of the work “al-Taysir fi `Ilm al-Taysir” are stored not only in our country, but in other countries too. Particularly, there are 77 copies of this work in the libraries of Turkey. These manuscripts are well preserved than other copies of this work. The article gives information about manuscript copies of the work “al-Taysir fi `Ilm al-Taysir” in the Sulaymaniyah library of Turkey. KEY WORDS: Abu Khafs `Umar Nasafi, Tafsir, al-Taysir fi `Ilm al-Tafsir, verse, faith, hadith, scholar of his time, method.


1978 ◽  
Vol 48 ◽  
pp. 535-542
Author(s):  
D. Böhme ◽  
H. U. Sandig

On the IAU Symposium No. 61 in Perth there was delivered a paper “by Deutsch and Klemola (1974) with some information into a program to be started at Dresden (in cooperation with the Zentralinstitut für Astrophysik at Potsdam), which was called Lohrmann Program by the authors mentioned. In a similar way as the extensive programs already in realization in Lick and Pulkovo the Lohrmann Program has on the one hand the aim to determine absolute proper motions by connection of weak stars with suitable extragalctic objects. On the other hand shall be examined systematic errors for the AGK3. First of all we examined (1971 to 1976) carefully the Schmidt version of the Tautenburg 2m reflector belonging to the Zentralinstitut für Astrophysik of the Academy of Sciences. Besides we did set up a program of fields to be taken by the Schmidt, first of all a pilot program.


2001 ◽  
Vol 67 (7) ◽  
pp. 3220-3225 ◽  
Author(s):  
Deborah A. Chiavelli ◽  
Jane W. Marsh ◽  
Ronald K. Taylor

ABSTRACT The bacterium Vibrio cholerae, the etiological agent of cholera, is often found attached to plankton, a property that is thought to contribute to its environmental persistence in aquatic habitats. The V. cholerae O1 El Tor biotype andV. cholerae O139 strains produce a surface pilus termed the mannose-sensitive hemagglutinin (MSHA), whereas V. cholerae O1 classical biotype strains do not. AlthoughV. cholerae O1 classical does not elaborate MSHA, the gene is present and expressed at a level comparable to that of the other strains. Since V. cholerae O1 El Tor and V. cholerae O139 have displaced V. cholerae O1 classical as the major epidemic strains over the last fifteen years, we investigated the potential role of MSHA in mediating adherence to plankton. We found that mutation of mshA in V. cholerae O1 El Tor significantly diminished, but did not eliminate, adherence to exoskeletons of the planktonic crustaceanDaphnia pulex. The effect of the mutation was more pronounced for V. cholerae O139, essentially eliminating adherence. Adherence of the V. cholerae O1 classicalmshA mutant was unaffected. The results suggest that MSHA is a factor contributing to the ability of V. cholerae to adhere to plankton. The results also showed that both biotypes of V. cholerae O1 utilize factors in addition to MSHA for zooplankton adherence. The expression of MSHA and these additional, yet to be defined, adherence factors differ in a serogroup- and biotype-specific manner.


Mäetagused ◽  
2021 ◽  
Vol 79 ◽  
pp. 185-200
Author(s):  
Tiiu Jaago ◽  
◽  
Mare Kõiva ◽  
◽  

Folklorist Elmar Daniel Päss (1901–1970) was one of the first researchers who was educated in folklore at the University of Tartu: the Chair of Folklore started work in the autumn of 1919, and Elmar Päss entered university in the autumn of 1922. Already as a student, he attracted the attention of folklore professor Walter Anderson with his study about drinking in Estonian proverbs and folk songs, submitted for a students’ competition in 1924. There was no unified folklore archive in Tartu at the time (it was established in 1927). The study by Päss testified to his diligence (he examined collections of Estonian folklore both in Tartu and in Helsinki) as well as his ability to systematise and analyse voluminous material. He elaborated this study and defended it as his master’s degree in 1926. After a year in military service, he started work as a folklore assistant at the University of Tartu. In 1933 he became a scientific grantee, to work on a dissertation about Estonian and Ingrian Martinmas songs. Although the first version of the manuscript was completed in 1935, he did not defend the thesis. On the one hand, new material on Martinmas customs was constantly piling up, on the other hand, the defence seemed to be postponed due to economic difficulties. The establishment of the Soviet rule in 1940 and the following war further distanced Päss from research work. In 1947 the Institute of Estonian Language and Literature was founded at the Academy of Sciences, and for three years he worked there as a folklore researcher. However, his main occupation was a schoolteacher. So his most fertile scientific career remained in the 1920s–1930s. Three different intertwining directions can be distinguished in Päss’ scientific work: a comparative study of songs, customs related to calendar, wedding, and work, and the lore of border regions. Against the more general background of folkloristics, Päss’ research approaches are up to date: on the one hand, comparative and international research prevailing in the first decades of the century, on the other hand, considering the syncretic and functionalist viewpoint of lore that emerged in the late 1920s and in the 1930s. His studies of the customs and songs of Shrovetide and Martinmas could be part of classical Estonian folkloristics.


2009 ◽  
Vol 52 (5) ◽  
pp. 1091-1098
Author(s):  
Ilisandra Zanandrea ◽  
Marcos Antonio Bacarin ◽  
Eugenia Jacira Bolacel Braga ◽  
Valmor João Bianchi ◽  
José Antonio Peters

The aim of the present study was to evaluate the growth and development of apple rootstock shoots submitted to different photon flux densities (7, 14, 21 and 60 µmol m-2 s-1) and three culture media. The best photon flux for maximizing growth, number of shoots and leaves was 14 µmol m-2 s-1, which also resulted in the highest values of chloroplastic pigments. On the other hand, the highest photon flux (60 µmol m-2 s-1) decreased significantly these parameters. Medium with reduced sucrose concentration did not affect the analyzed parameters, enabling an efficient multiplication of the cultivar with only 1% of sucrose.


1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.


Author(s):  
A. V. Crewe

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.


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