Chlamydia psittaci: a suspected cause of reproductive loss in three Victorian horses     

R Akter  AW Stent  FM Sansom  JR Gilkerson  C Burden  JM Devlin  AR Legione  CM El-Hage 《Australian veterinary journal》2020,98(11):570-573

Chlamydia psittaci was detected by PCR in the lung and equine foetal membranes of two aborted equine foetuses and one weak foal from two different studs in Victoria, Australia. The abortions occurred in September 2019 in two mares sharing a paddock northeast of Melbourne. The weak foal was born in October 2019 in a similar geographical region and died soon after birth despite receiving veterinary care. The detection of C. psittaci DNA in the lung and equine foetal membranes of the aborted or weak foals and the absence of any other factors that are commonly associated with abortion or neonatal death suggest that this pathogen may be the cause of the reproductive loss. The detection of C. psittaci in these cases is consistent with the recent detection of C. psittaci in association with equine abortion in New South Wales. These cases in Victoria show that C. psittaci, and the zoonotic risk it poses, should be considered in association with equine reproductive loss in other areas of Australia.  相似文献   

A Recessive Mutant of argonaute1b/gsnl4 Leads to Narrow Leaf,Small Grain Size and Low Seed Setting in Rice     

Mengqiu Song  Shuang Ruan  Youlin Peng  Zhongwei Wang  Noushin Jahan  Yu Zhang  Yongtao Cui  Haitao Hu  Hongzhen Jiang  Shilin Ding  Lan Shen  Zhenyu Gao  Xingming Hu  Qian Qian  Longbiao Guo 《水稻科学》2021,28(6):521-524

正A gsnl4 mutant characterized by small grain size, narrow leaf and low seed-setting rate was obtained by ethyl methane sulfonate(EMS) mutagenesis of a japonica rice variety Wuyunjing 21. Genetic analysis showed that gsnl4 is a loss-of-function mutant. A single-base mutation in gsnl4 resulted in the substitution of Ser to Asn in the Piwi domain of Os AGO1 b protein. CRISPR/Cas9-mediated editing of Os AGO1 b yielded a mutant phenotypically resembling gsnl4. Furthermore,  相似文献   

Studies on the macromolecular components of nonwood available in Bangladesh     

M. Sarwar Jahan  Sung Phil Mun 《Industrial Crops and Products》2009,30(3):344-350

The structural feature of macromolecular component of dhaincha, cotton stalks, jute fiber, rice straw and wheat straw, which are commonly used in paper pulp production in forest deficient countries, was thoroughly studied. Lignin was isolated by classical Bjorkman method and characterized by elemental and methoxyl analysis, alkaline nitrobenzene oxidation, FTIR and ¹H NMR spectroscopy. The C₉ formulas for cotton stalks, jute fiber, dhaincha, rice straw and wheat straw were C₉H_8.95O_3.53(OCH₃)_1.00, C₉H_8.12O_4.03(OCH₃)_1.65, C₉H_8.10O_4.65(OCH₃)_1.32, C₉H_8.58O_3.74(OCH₃)_1.23 and C₉H_8.31O_3.54(OCH₃)_1.23, respectively. The alkaline nitrobenzene oxidation products showed that syringyl to vanilin ratio of these nonwood varied from 1.1 to 2.9. Jute fiber showed the highest syringyl to vanilin ratio that are consistent with C₉ formula. The β-O-4 units in these nonwood lignins had predominately erythro stereochemistry type. The crystalline structure of these nonwood cellulose was also studied using X-ray diffraction and FTIR spectroscopy. The proportions of crystallinity, crystal size were varied from plant to plant. Jute fiber showed the highest proportion of crystallinity (73.4%) and crystal size (4.2 nm). The degree of polymerization of these nonwoods cellulose has also been studied. Degree of polymerization of jute cellulose was also the highest (3875). FTIR spectroscopy showed that these nonwoods cellulose was monoclinic unit cell structure (I_β). Carbohydrate analysis showed that the main sugar component in the hydrolyzates of these nonwoods were xylose apart from glucose.  相似文献   

The effect of selenium and vitamin E on the lymphocytes and immunoglobulin-containing plasma cells in the lymphoid organ and mucosa-associated lymphatic tissues of broiler chickens     

Khan MZ  Akter SH  Islam MN  Karim MR  Islam MR  Kon Y 《Anatomia, histologia, embryologia》2008,37(1):52-59

The present research has been designed to understand the effect of selenium and vitamin E on the lymphocyte and changes in the frequency of Ig-containing plasma cells in the lymphatic organ and ileum (representative organ for mucosa-associated lymphatic tissues) of different postnatal stages of Kasilla broiler chickens. A routine haematoxylin and eosin (H and E) stain were used to study the histology of the lymphocytic changes, and indirect immunoperoxidase staining method was performed for the study of the distributional and dynamical changes of the Ig-containing plasma cells within the lymphatic tissues and in the ileum of control broilers and in the broilers supplemented with different concentration of selenium and vitamin E in the diet. Histologically, the population of lymphocytes decreased in the lobules of the thymus, medulla of bursal follicles, splenic masses, lymphatic nodules of the cecal tonsil, and villi of the ilium in 0.1 mg and 0.5 mg selenium supplemented broilers in comparison with the control. The population of these cells was found to increase in 150 mg and 300 mg vitamin E supplemented chickens in the present study. In the spleen IgG- and the IgM-containing plasma cells were more than IgA-containing plasma cells. In contrast, in the cecal tonsil and ileum IgA-containing plasma cells were more than IgG- and IgM-containing plasma cells. The frequency of these immunopositive cells were decreased in 0.1 mg and 0.5 mg selenium supplementated chickens, and increased their frequency in the chickens supplemented with 150 mg and 300 mg vitamin E. In the spleen the frequency of IgM-containing plasma cells and both in the cecal tonsil and ileum, the IgG-containing plasma cells were more decreased by selenium supplementation which restored in their population by vitamin E supplementation.  相似文献   

Constituents and cytotoxicity of Zanthoxylum rhesta stem bark     

Monira Ahsan  Tahmina Akter Zaman  Choudhury M. Hasan  Chihiro Ito  S. K. Nazrul Islam   《Fitoterapia》2000,71(6)

3,5-Dimethoxy-4-geranyloxycinnamyl alcohol (1), 8-methoxy-N-methylflindersine (2), xanthyletin and sesamin have been isolated from petroleum ether extract of the stem bark of Zanthoxylum rhesta. The petroleum ether extract and 8-methoxy-N-methylflindersine showed cytotoxicity on brine shrimp nauplii.  相似文献   

Microbiological quality of drinking water from dispensers in roadside restaurants of Bangladesh     

Moniruzzaman M  Akter S  Islam MA  Mia Z 《Pakistan journal of biological sciences: PJBS》2011,14(2):142-145

The microbiological status of water from dispensers in different roadside restaurants of Dhaka city and Savar area was analyzed in this study. Seven samples from Dhaka and 8 samples of Savar were checked. The heterotrophic plate count was in a range of 1.0 x 10(3) CFU mL(-1) to 2.0 x 10(4) CFU mL(-1) (from new bottles), 1.0 x 10(3) to 1.5 x 10(4) CFU mL(-1) (after dispensation), and 1.5 x 10(3) CFU mL(-1) to 1.0 x l0(5) CFU mL(-1) (from serving glass). In several of the samples, the heterotrophic plate count was higher than the count in water from new bottle or after dispensation, suggesting added contamination from the serving glass. 80% of the samples were contaminated with total and fecal coliform bacteria, which render these waters unacceptable for human consumption. The samples were found to contain gram negative bacteria like E coli, Shigella sp., Klebsiella sp., Enterobacter sp., Pseudomonas sp., and Salmonella sp., which are potential pathogens and thus pose a serious threat to public health. This study elucidates the importance of monitoring the bottling companies and the restaurants and put them under strict regulations to prevent future outbreak of any water borne diseases caused by consumption of dispensed water.  相似文献   

AN IN-VITRO SCREENING METHOD TO STUDY THE ACTIVITY POTENTIAL OF BIOFERTILIZERS BASED ON TRICHODERMA AND BACILLUS SP.     

Zafrin Akter  Markus Weinmann  Günter Neumann  Volker Römheld 《Journal of plant nutrition》2013,36(9):1439-1452

Little scientific information on efficiency of different commercial biofertilizers restricts setup of further reproducible pot or field experiments and hence, provides lack of evidence of biofertilizer application in plant growth promotion and disease suppression. In the present experiment, efficiency of four commercial Trichoderma and one Bacillus biofertilizer was screened by a bio-indicator plant, cucumber (Cucumis sativus L.) under controlled laboratory conditions. Inoculation of cucumber seeds with different commercial biofertilizers significantly increased the germination rates (ca. 20–25%) and stimulated other growth parameters. In seedling establishment test, biofertilizers inoculated cucumber seedlings showed significant higher root dry weight (ca. 32 to 96%), leaf area (ca. 60 to 140%), root length (ca. 30%) and shoot dry weight (ca. 88%) in two weeks culture period compare to that of the control. Additionally, in-vitro antagonistic activity against take-all pathogen (Gaeumannomyces graminis var. tritici, Ggt) in wheat and phosphate solubilizing activity was demonstrated for Trichoderma biofertilizer. However, in-vitro solubilization of Mn was not detected. The results suggested that the potential activity of different commercial biofertilizers could be easily screened within several days with the described rapid bio-test by increasing seed germination, and improving growth and growth related parameters of cucumber grown in nutrient solution under controlled culture system.  相似文献   

The incidence of suspected white spot syndrome virus in semi‐intensive and extensive shrimp farms in Bangladesh: implications for management     

Manjurul Karim  Rayhan Hayat Sarwer  Alan C. Brooks  Rick Gregory  Murshed E. Jahan  Ben Belton 《Aquaculture Research》2012,43(9):1357-1371

The study was conducted to assess key factors influencing suspected white spot syndrome virus (WSSV) disease and associated shrimp production and economic performance in three contrasting black tiger shrimp (Penaeus monodon) culture technologies promoted by the United States Agency for International Development funded Shrimp Quality Support Project (SQSP) in Bangladesh. A total of 350 traditional, 315 Modified Traditional Technology1 (MTT1), 36 MTT2 and 88 Closed System Technology (CST) farmers from 10 sub‐districts in three districts of Khulna division were surveyed following random sampling at the end of the project. Binomial probit regression analysis revealed that smaller newly constructed ponds (known locally as gher) were less susceptible to WSSV, provided aquatic weeds were controlled using chemicals. Removal of sludge from ghers also had a positive effect, irrespective of technology and location. It was also shown that stocking of screened shrimp postlarvae (PL) does not guarantee protection against WSSV (t = 1.39, P > 0.05). Higher shrimp production was obtained by farmers practicing CST, followed by those operating MTTs and traditional technology respectively. Farmers who adopted CST also gained higher profitability followed by those operating MTT1, MTT2 and traditional technology.  相似文献   

Alleviation of drought stress in maize by exogenous application of gibberellic acid and cytokinin     

Nurunnaher Akter  M. Rafiqul Islam  M. Abdul Karim  Tofazzal Hossain 《Journal of Crop Science and Biotechnology》2014,17(1):41-48

The study was conducted to investigate the ameliorative roles of GA₃ and CK on adverse effects of drought in maize. Drought stressed maize plants were applied with GA₃ and CK at 50, 100, and 150 mg L^?l as foliar spray at the vegetative and the reproductive stages. Plant height, internode length, stem diameter, leaf chlorophyll index, and dry matter production were significantly affected by drought. In most cases, GA₃ and CK significantly improved the depressed plant traits, but in varying degrees depending on the growth stage encountering hormones, and their types and concentrations. Both GA₃ and CK were found to be very effective in alleviating drought-imposed adverse effects on maize at the vegetative phase. Such alleviating effects varied depending on the concentration of the hormones. Application of CK at 150 mg L^?l was excellent resulting in a 106% yield advantage compared to drought stress and 79.9% increase relative to well-watered controls. Conversely, GA₃ at 50 mg L^?l performed well showing 78.8% increase in grain yield. However, both GA₃ and CK had very little effect on improving the depressed growth and yield attributes in maize at the reproductive phase. The relative yield advantages for the hormones were mainly attributed to improving the cob and seed-bearing capacity of drought-stressed maize plants.  相似文献   

Nitrogen transformation and carbon sequestration in wetland paddy field of Bangladesh     

Alam  Md. Ashraful  Rahman  Md. Mizanur  Biswas  Jatish Chandra  Akhter  Sohela  Maniruzzaman  M.  Choudhury  Apurba Kanti  Jahan  M. Abu Hena Sorwar  Miah  Md. Main Uddin  Sen  Ranjit  Kamal  M. Zia Uddin  Mannan  Md. Abdul  Shiragi  Humayun Kabir  Kabir  Wais  Kalra  Naveen 《Paddy and Water Environment》2019,17(4):677-688

Paddy and Water Environment - Rice-based cropping systems in Bangladesh have received little consideration of changing nitrogen (N) and carbon (C) in soil. Therefore, this study was conducted at...  相似文献