The interdependence of B chromosomes, nucleolar organizer expression, and larval development in the blackfly species Cnephia dacotensis and Cnephia ornithophilia (Diptera: Simuliidae)

1982 ◽  
Vol 60 (11) ◽  
pp. 2879-2896 ◽  
Author(s):  
William S. Procunier
Keyword(s):  
Nucleolar Organizer ◽  
B Chromosome ◽  
Sampling Time ◽  
B Chromosomes ◽  
Sex Bias ◽  
Larval Size ◽  
High Incidence ◽  
Population Comparisons ◽  
Group A ◽  
Primary Relationship

A primary relationship is found between nucleolar organizer (NO) expression (puffing) of the A complement and numbers of B chromosomes in Cnephia dacotensis, such that a high incidence of B's is associated with nonexpression of the NO independent of sampling time and larval size. NO expression can be categorized into three zygote classes: + +, + −, and − −, where + indicates puffing of one constituent and − indicates little or no puffing. The + + types generally mature earlier than the + − and − − types. These observations suggest that development rates are a function of NO expression: − − types do not mature at all unless they have B's and (or) secondary nucleoli. Population comparisons confirm the prediction that as the frequency of individuals with one or more B's decreases, the frequency of individuals with expressed constituents increases. A sex bias in NO expression exists with more expression in females. Additional plasticity is conferred to the system through an apparent conversion phenomenon which reduces X+X+ expression in females and dosage compensates X−Y− males. Both of these effects are B-chromosome dependent and are lost in zero B populations. It is proposed that B–A NO interactions constitute a system for more efficient rRNA production by optimizing synthesis between the sexes. This system may account for the wider range and occupation of more diversified habitats of C. dacotensis than for other members of the group. A similar but less dynamic role is proposed for the effects of B chromosomes in C. ornithophilia.

Comparative Study Between Clean Intermittent Self-Catheterization (Cisc) and Continuous Indwelling Catheterization (Cidc) in Relieving Acute Refractory Retention of Urine Due to Benign Enlargement of Prostate (Bep)

2020 ◽  
Vol 21 (2) ◽  
pp. 105-110
Author(s):  
Md Shawkat Alam ◽  
Sudip Das Gupta ◽  
Hadi Zia Uddin Ahmed ◽  
Md Saruar Alam ◽  
Sharif Muhammod Wasimuddin
Keyword(s):  
Comparative Study ◽  
Acute Urinary Retention ◽  
Bladder Capacity ◽  
Inclusion Criteria ◽  
College Hospital ◽  
Medical College ◽  
High Incidence ◽  
Group A ◽  
Group B ◽  
Better Than

Objective: To compare the clean intermittent self-catheterization (CISC) with continuous indwelling catheterization (CIDC) in relieving acute urinary retention (AUR) due to benign enlargement of prostate (BEP). Materials and Methods :A total 60 patients attending in urology department of Dhaka Medical college hospital were included according to inclusion criteria ,Patients were randomized by lottery into two groups namely group –A and group –B for CISC and IDC drainage respectively . Thus total 60 patients 30 in each group completed study. Results : Most men can safely be managed as out-patients after AUR due to BPH. The degree of mucosal congestion and inflammation within the bladder was found to be lower in those using CISC and the bladder capacity in these patients was also found higher.Patients with an IDC had a high incidence of UTIs then that of patients with CISC. During the period of catheterization the incidence of UTI was 43.3% in group B in comparison to 40% in group A; before TURP 36% in group B in comparison to 10% incidence in group A.According to patient’s opinion CISC is better than IDC in the management of AUR. Experiencing bladder spasm, reporting blood in urine, management difficulties, incidence and severity of pain were less in CISC group, and the method of CISC was well accepted by patients as well as their family members. Conclusion: From the current study it may be suggested that CISC is better technique for management of AUR patient due to BPH than IDC. It can also be very helpful when surgery must be delayed or avoided due to any reasons in this group of patients. Bangladesh Journal of Urology, Vol. 21, No. 2, July 2018 p.105-110

scholarly journals Repetitive DNA landscape in essential A and supernumerary B chromosomes of Festuca pratensis Huds

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Rahman Ebrahimzadegan ◽  
Andreas Houben ◽  
Ghader Mirzaghaderi
Keyword(s):  
Repetitive Sequences ◽  
Nuclear Genome ◽  
B Chromosome ◽  
B Chromosomes ◽  
Festuca Pratensis ◽  
Ltr Retrotransposons ◽  
Chromosome Identification ◽  
Satellite Repeats ◽  
Low Pass ◽  
Illumina Sequence

AbstractHere, we characterized the basic properties of repetitive sequences in essential A and supernumerary B chromosomes of Festuca pratensis Huds. This was performed by comparative analysis of low-pass Illumina sequence reads of B chromosome lacking (−B) and B chromosome containing (+B) individuals of F. pratensis. 61% of the nuclear genome is composed of repetitive sequences. 43.1% of the genome are transposons of which DNA transposons and retrotransposons made up 2.3% and 40.8%, respectively. LTR retrotransposons are the most abundant mobile elements and contribute to 40.7% of the genome and divided into Ty3-gypsy and Ty1-copia super families with 32.97% and 7.78% of the genome, respectively. Eighteen different satellite repeats were identified making up 3.9% of the genome. Five satellite repeats were used as cytological markers for chromosome identification and genome analysis in the genus Festuca. Four satellite repeats were identified on B chromosomes among which Fp-Sat48 and Fp-Sat253 were specific to the B chromosome of F. pratensis.

scholarly journals Spatial organization of fibroblast and spermatocyte nuclei with different B-chromosome content in Korean field mouse, Apodemus peninsulae (Rodentia, Muridae)

Genome ◽  
2017 ◽  
Vol 60 (10) ◽  
pp. 815-824 ◽  
Author(s):  
Tatyana V. Karamysheva ◽  
Anna A. Torgasheva ◽  
Yaroslav R. Yefremov ◽  
Anton G. Bogomolov ◽  
Thomas Liehr ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Spatial Organization ◽  
Constitutive Heterochromatin ◽  
B Chromosome ◽  
B Chromosomes ◽  
Laser Scanning Microscopy ◽  
Field Mouse ◽  
Apodemus Peninsulae ◽  
Basic Set ◽  
Korean Field Mouse

Korean field mouse (Apodemus peninsulae) shows a wide variation in the number of B chromosomes composed of constitutive heterochromatin. For this reason, it provides a good model to study the influence of the number of centromeres and amount of heterochromatin on spatial organization of interphase nuclei. We analyzed the three-dimensional organization of fibroblast and spermatocyte nuclei of the field mice carrying a different number of B chromosomes using laser scanning microscopy and 3D fluorescence in situ hybridization. We detected a co-localization of the B chromosomes with constitutive heterochromatin of the chromosomes of the basic set. We showed a non-random distribution of B chromosomes in the spermatocyte nuclei. Unpaired B chromosomes showed a tendency to occur in the compartment formed by the unpaired part of the XY bivalent.

High incidence of ultraviolet-B-or chemical-carcinogen-induced skin tumours in mice lacking the xeroderma pigmentosum group A gene

Nature ◽  
1995 ◽  
Vol 377 (6545) ◽  
pp. 165-168 ◽  
Author(s):  
Hironobu Nakane ◽  
Seiji Takeuchi ◽  
Shunsuke Yuba ◽  
Masafumi Saijo ◽  
Yoshimichi Nakatsu ◽  
...  
Keyword(s):  
Xeroderma Pigmentosum ◽  
Ultraviolet B ◽  
Chemical Carcinogen ◽  
Skin Tumours ◽  
High Incidence ◽  
Group A ◽  
Xeroderma Pigmentosum Group A

The utility of rapid Group A streptococcus molecular testing compared with throat culture for the diagnosis of Group A streptococcal pharyngitis in a high-incidence rheumatic fever population.

2021 ◽  
Author(s):  
Amanda Taylor ◽  
Susan Morpeth ◽  
Rachel Webb ◽  
Susan Taylor
Keyword(s):  
New Zealand ◽  
Rheumatic Fever ◽  
Predictive Value ◽  
Gold Standard ◽  
Molecular Test ◽  
Throat Culture ◽  
High Incidence ◽  
Group A ◽  
Sensitivity Specificity ◽  
Culture Negative

Background: Group A Streptococcus (GAS) causes significant morbidity and mortality in New Zealand and is responsible for invasive disease and immune sequelae including acute Rheumatic Fever (ARF). Early treatment of GAS pharyngitis reduces the risk of ARF. In settings with a high-burden of GAS disease, a rapid GAS pharyngitis diagnostic test with a strong negative predictive value is needed to enable prompt and accurate treatment. Methods: This prospective study compares the Xpert® Xpress Strep A molecular test (Cepheid) to throat culture and a second molecular method, the BioGX Group A Streptococcus -OSR for BD MAX TM for the diagnosis of GAS pharyngitis. Throat swabs were collected from the emergency department and wards of Middlemore Hospital, New Zealand. The BioGX Group A Streptococcus - OSR for BD MAX TM , contributes to the composite gold-standard: throat culture or both molecular methods positive. Basic demographic, clinical and laboratory data was collected. Results: 205/214 swabs were suitable for analysis. 28/205 (13.7%) were GAS culture positive, 45/205 (22%) Xpert® Xpress Strep A positive and 38/205 (18.5%) BioGX positive. Compared to culture, the sensitivity, specificity, positive and negative predictive values of the Xpert® Xpress Strep A molecular test were 100%, 90.4%, 62.2% and 100%, respectively. Compared to the composite gold-standard, the sensitivity, specificity, PPV and NPV and were 100%, 95.8%, 84.4% and 100% respectively. 17 samples were Xpert® Xpress positive but culture-negative; 6 of these 17 swabs represent true positives with evidence of recent GAS infection. Ten samples were culture negative but both Xpert® Xpress and BioGX positive. Conclusion: The Xpert® Xpress Strep A molecular test is highly sensitive with a strong negative predictive value and rapid turnaround time. It can be safely introduced as a first line test for throat swabs in a high-incidence ARF population.

RANDOMIZED COMPARATIVE STUDY OF ONDANSETRON AND COMBINATION OF ONDANSETRON AND DEXAMETHASONE, AS A PROPHYLAXIS OF POST-OPERATIVE NAUSEAAND VOMITING IN ADULTS UNDERGOING ELECTIVE LAPAROSCOPIC SURGERIES

2021 ◽  
pp. 48-49
Author(s):  
Rumani Ruku ◽  
Jasmeen Chowdhary
Keyword(s):  
Laparoscopic Surgery ◽  
Surgical Care ◽  
Demographic Variables ◽  
Nausea And Vomiting ◽  
Age Group ◽  
Patient Response ◽  
High Incidence ◽  
Group A ◽  
Group B ◽  
Post Operative Nausea

Background: Post-operative nausea and vomiting (PONV) is quite associated with laparoscopic surgery. In-spite of advances in surgery and post surgical care, nausea and vomiting still has a high incidence. This study was planned to explore the efcacy of a combination therapy of ondansetron with dexamethasone against PONVand compare the results with the efcacy of ondensetron-only. Method:Arandomized clinical trial study was conducted in the Department of Anesthesia, GMC Jammu, over a period of 6 months, on 50 patients in the age group of 18-50 years, of either gender, undergoing laparoscopic surgeries under general anesthesia. Patients were divided into two groups of 25 each: Group A received 4 mg of Ondansetron intravenously, while Group B received 4 mg of Ondansetron and 8 mg of Dexamethasone intravenously, soon after intubation. Results: The demographic variables of two groups were similar. While 19 (76%) patients showed post-operative nausea in Group A, while in Group B, only 8 (32%) patients experienced nausea, which was very signicant. Similarly, 11 (44%) patients showed post-operative vomiting in GroupAand only 2 (8%) complained of vomiting. 24% patients did not complain about any kind of nausea or vomiting in GroupA. Mild nausea was observedin60%patientsinGroupA,while amongonly32%patientsingroupB.Nocomplications of anykindwereobservedduringthisstudy. Conclusion: Ondensetron and dexamethasone, administered intravenously, after intubation, in laparoscopic surgery, is safe and has a better patient response in preventing post-operative nausea and vomiting.

scholarly journals B Chromosomes in Populations of Mammals Revisited

Genes ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 487 ◽  
Author(s):  
Mladen Vujošević ◽  
Marija Rajičić ◽  
Jelena Blagojević
Keyword(s):  
Mammalian Species ◽  
B Chromosome ◽  
Molecular Techniques ◽  
B Chromosomes ◽  
General View ◽  
Protein Coding ◽  
Host Parasite Interactions ◽  
Quantitative Characteristics ◽  
Host Parasite

The study of B chromosomes (Bs) started more than a century ago, while their presence in mammals dates since 1965. As the past two decades have seen huge progress in application of molecular techniques, we decided to throw a glance on new data on Bs in mammals and to review them. We listed 85 mammals with Bs that make 1.94% of karyotypically studied species. Contrary to general view, a typical B chromosome in mammals appears both as sub- or metacentric that is the same size as small chromosomes of standard complement. Both karyotypically stable and unstable species possess Bs. The presence of Bs in certain species influences the cell division, the degree of recombination, the development, a number of quantitative characteristics, the host-parasite interactions and their behaviour. There is at least some data on molecular structure of Bs recorded in nearly a quarter of species. Nevertheless, a more detailed molecular composition of Bs presently known for six mammalian species, confirms the presence of protein coding genes, and the transcriptional activity for some of them. Therefore, the idea that Bs are inert is outdated, but the role of Bs is yet to be determined. The maintenance of Bs is obviously not the same for all species, so the current models must be adapted while bearing in mind that Bs are not inactive as it was once thought.

scholarly journals Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae)

2013 ◽  
Vol 85 (4) ◽  
pp. 1371-1377 ◽  
Author(s):  
MANOLO PENITENTE ◽  
TATIANA A. VOLTOLIN ◽  
JOSE A. SENHORINI ◽  
JEHUD BORTOLOZZI ◽  
FAUSTO FORESTI ◽  
...  
Keyword(s):  
Transmission Rate ◽  
B Chromosome ◽  
B Chromosomes ◽  
Rate Variation ◽  
Parental Line ◽  
Prochilodus Lineatus ◽  
Extinction Process ◽  
Cytogenetic Studies ◽  
Acrocentric Chromosomes ◽  
Interesting System

Cytogenetic studies were developed in Prochilodus lineatus (Valenciennes 1836), describing an interesting system of small supernumerary chromosomes. The purpose of this work is to study the frequency and morphology of B chromosomes in individuals from the parental line and the inheritance patterns of these elements in individuals obtained from controlled crosses in the species P. lineatus. The transmission rate of B chromosomes revealed a kB=0.388 for the acrocentric type, a kB=0.507 for the metacentric type and a kB=0.526 for the submetacentric type. The obtained results raise hypothesis that B-acrocentric chromosomes are involved in an extinction process in this species, while the metacentric and submetacentric supernumerary elements comprises a neutral mechanism and follows a Mendelian transmission rate.

Identification of a family of repeated sequences on the rye B chromosome

Genome ◽  
1990 ◽  
Vol 33 (6) ◽  
pp. 908-913 ◽  
Author(s):  
Michael J. Sandery ◽  
John W. Forster ◽  
Richard Blunden ◽  
R. Neil Jones
Keyword(s):  
Secale Cereale ◽  
Direct Evidence ◽  
B Chromosome ◽  
Repeat Sequence ◽  
B Chromosomes ◽  
Repeated Sequences ◽  
Significant Heterogeneity ◽  
Origin And Evolution ◽  
The Family

A novel family of highly repeated sequences on the B chromosome of rye (Secale cereale) has been identified. The D1100 family has not been detected on the rye A chromosomes and shows little or no homology to any previously described repeat sequence in rye. In addition, different rye species, and different B chromosomes within the same species, show significant heterogeneity in the arrangement of the D1100 sequences. An EcoRI clone of a member of the family has been obtained. These results provide direct evidence for the organisation and nature of the B-chromosome DNA in rye, and they are discussed in relation to the origin and evolution of rye B chromosomes.Key words: B chromosome, Secale cereale, repeated sequences.

scholarly journals Can We Do Away With PTBD?

HPB Surgery ◽  
1995 ◽  
Vol 9 (1) ◽  
pp. 5-11 ◽  
Author(s):  
R. D. Bapat ◽  
N. N. Rege ◽  
R. S. Koti ◽  
N. K. Desai ◽  
S. A. Dahanukar
Keyword(s):  
Percutaneous Transhepatic Biliary Drainage ◽  
Biliary Tree ◽  
Tinospora Cordifolia ◽  
Sepsis Group ◽  
High Incidence ◽  
Group A ◽  
Pmn Functions ◽  
Group B ◽  
Group D ◽  
Transhepatic Biliary Drainage

Percutaneous Transhepatic Biliary Drainage (PTBD) is performed in surgical jaundice to decompress the biliary tree and improve hepatic functions. However, the risk of sepsis is high in these patients due to immunosuppression and surgical outcome remains poor. This raises a question—can we do away with PTBD? To answer this query a study was carried out in 4 groups of patients bearing in mind the high incidence of sepsis and our earlier studies, which have demonstrated immunotherapeutic potential of Tinospora cordifolia (TC): (A) those undergoing surgery without PTBD (n = 14), (B) those undergoing surgery after PTBD (n = 13). The mortality was 57.14% in Group A as compared to 61.54% in Group B. Serial estimations of bilirubin levels carried out during the course of drainage (3 Wks) revealed a gradual and significant decrease from 12.52 ± 8.3 mg% to 5.85 ± 3.0 mg%. Antipyrine half-life did not change significantly (18.35 ± 4.2 hrs compared to basal values 21.96 ± 3.78 hrs). The phagocytic and intracellular killing (ICK) capacities of PMN remained suppressed (Basal: 22.13 ± 3.68% phago, and 19.1 ± 4.49% ICK; Post drainage: 20 ± 8.48% Phago and 11.15 ± 3.05% ICK). Thus PTBD did not improve the metabolic capacity ofthe liver and mortality was higher due to sepsis. Group (C) patientg received TC during PTBD (n = 16) and Group (D) patients received TC without PTBD (n = 14). A significant improvement in PMN functions occurred by 3 weeks in both groups (30.29 ± 4.68% phago, 30 ± 4.84% ICK in Group C and 30.4 ± 2.99% phago, 27.15 ± 6.19% ICK in Group D). The mortality in Groups C and D was 25% and 14.2% respectively during the preoperative period. There was no mortality after surgery. It appears from this study that host defenses as reflected by PMN functions play an important role in influencing prognosis. Further decompression of the biliary tree by PTBD seems unwarranted.

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