Insight into strigolactone hormone functions in plant parasitic weeds: a regulatory perspective

The strigolactones (SLs) are plants hormones that have multiple functions in architecture and development. The roles of SLs in shoot branching and stem secondary growth of autotrophic plants are established. SL is also involved in the interaction between root parasitic plants and their host plants. SLs are exudates by the root of the host plant in search of a fungal partner for symbiotic association, while parasitic plants utilize this facility to detect the host root. The first formed tubercle of Philapanhche, whose germinations are driven by host-derived SLs, exudates parasitic derived SLs (PSLs) and could encourages germination of the adjacent parasitic seeds, resulting in parasite cluster formation. The existence of aboveground spikes in clusters suggests an intriguing approach for increasing parasite population by amplifying PSLs, which result in massive parasitic seed germination. PSLs probably have a role in the increased branching of Broomrapes opposing the host plant, resulting in the parasites' clustered appearance aboveground. This review highlights the distinct roles of SLs and PSLs, and their potential role in host-parasitic interaction.

Awareness about rabies and health seeking behavior among animal bite victims attending a tertiary care hospital of Jharkhand

Background: Rabies is an acute fatal disease of central nervous system, caused by Lyssavirus Type 1. Rabies in dogs is the source of 99% of human infection. Awareness about rabies and health seeking behavior are crucial determinants of rabies control. Present study was done to assess awareness regarding animal bite and health seeking behavior among affected population.Methods: A hospital based cross sectional study was conducted in central emergency department of Rajendra Institute of Medical Sciences, Ranchi, Jharkhand for a period of four months. A semi-structured questionnaire was used for data collection. Sample size was 114 using consecutive sampling method. The participants were interviewed after taking informed consent. Data collected were entered in MS Excel and analyzed using SPSS version 20.Results: A total of 114 subjects participated in the study of which 83 (72.8%) were male and 31 (27.2%) female. Most commonly affected age group found was 21-30 years (35.1%). Majority 101 (88.6%) of them resided in urban areas, and only 79 (69.3%) acquired secondary education and above. Most of the animal bite was caused by dogs 102 (89.5%), unprovoked 79 (69.3%) in nature and most common site involved lower limb 70 (61.4%). Majority 68 (59.6%) of the dog bite wound were of category II. Only 55 (48.2%) of animal bite victims washed their wound with soap and water. Majority 58 (50.9%) of the study participants had no knowledge about consequences of dog bite. Median reporting time to tertiary institute was found to be four hours.Conclusions: There was average level of awareness about rabies among animal bite victims attending RIMS, Ranchi

Neurodevelopmental Status of Children aged 6-30 months with Severe Acute Malnutrition

Objective: This cross sectional study was done to assess the developmental status inchildren (6-30 mo old) with severe acute malutrition (SAM). Methods: Study subjects wereenrolled from children in SAM therapeutic unit, and controls were selected from well-babyclinic of the institute. Neurodevelopment of both groups was assessed using theDevelopmental assessment scale of Indian infants (DASII). Developmental quotient (DQ) ?70was considered delayed.Results: Mean (SE) motor DQ 59.04 (0.74) and mental DQ 62.1(0.57) was lower in SAM as compared to controls (both P<0.0001). Clusters of early agewere normal but clusters with items of later infancy were delayed. Conclusions: Childrenwith SAM show significant delay in development, and motor DQ is affected more thanmental DQ.

Comparative evaluation of tooth substance loss and its correlation with the abrasivity and chemical composition of different dentifrices.

Context: In India, teeth cleaning with tooth powder is common in rural and semi‑urban areas. These dentifrices may contain low‑quality abrasives, which may have a deleterious effect on dental hard tissues. Aims: This study aims to evaluate the tooth substance loss caused by different dentifrices and to correlate it with chemical composition, size, and shape of abrasives used. Settings and Design: An indigenously made automated machine was used for brushing the specimens. Materials and Methods: Sixty‑four freshly extracted premolars were allocated to eight groups (n = 8). Colgate toothpaste was used as the control group. Each specimen was brushed in a vertical motion for 2½ h at 200 strokes/min with a constant applied load of 200 g corresponding to 6‑month brushing. The difference in weight (pre‑ and post‑brushing) was determined by an analytical weighing machine. Chemical analysis was done to determine the presence of iron oxide by Inductively Coupled Plasma Mass Spectrometry method. Shape and size of the abrasive particles was evaluated under scanning electron microscopy (SEM). Statistical Analysis Used: One‑way analysis of variance and Paired t‑test were used to analyze the data. Results: Tooth substance loss was maximum in the group brushed with red tooth powder, which was shown to contain the highest amount of iron oxide and also exhibited large, irregularly shaped abrasive particles under SEM. Conclusions: Tooth substance loss was documented to be correlated with chemical composition (iron oxide) and the size and shape of abrasive particles used in dentifrices.

Response of multiple herbicide resistant strain of diazotrophic cyanobacterium, Anabaena variabilis, exposed to atrazine and DCMU.

Effect of two photosynthetic inhibitor herbicides, atrazine (both purified and formulated) and [3-(3,4-dichlorophenyl)-1,1-dimethyl urea] (DCMU), on the growth, macromolecular contents, heterocyst frequency, photosynthetic O2 evolution and dark O2 uptake of wild type and multiple herbicide resistant (MHR) strain of diazotrophic cyanobacterium A. variabilis was studied. Cyanobacterial strains showed gradual inhibition in growth with increasing dosage of herbicides. Both wild type and MHR strain tolerated < 6.0 mg L-1 of atrazine (purified), < 2.0 mg L-1 of atrazine (formulated) and < 0.4 mg L-1 of DCMU indicating similar level of herbicide tolerance. Atrazine (pure) (8.0 mg L-1) and 4.0 mg L-1 of atrazine (formulated) were growth inhibitory concentrations (lethal) for both wild type and MHR strain indicating formulated atrazine was more toxic than the purified form. Comparatively lower concentrations of DCMU were found to be lethal for wild type and MHR strain, respectively. Thus, between the two herbicides tested DCMU was more growth toxic than atrazine. At sublethal dosages of herbicides, photosynthetic O2 evolution showed highest inhibition followed by chlorophyll a, phycobhiliproteins and heterocyst differentiation as compared to carotenoid, protein and respiratory O2 uptake.

Iron mediated regulation of growth and siderophore production in a diazotrophic cyanobacterium Anabaena cylindrica.

Iron mediated regulation of growth and siderophore production has been studied in a diazotrophic cyanobacterium Anabaena cylindrica. Iron-starved cells of A. cylindrica exhibited reduced growth (30%) when the cells were growing under N2-fixing conditions. In contrast, N03-, NO2-, NH4' and urea grown cells exhibited almost 50% reduction in their growth in the absence of iron as compared to their respective counterparts cultured in the presence of iron. However, at 60 microM of iron, A. cylindrica cells exhibited almost equal growth regardless of the nitrogen source available. Siderophore production in A. cylindrica was started after day 2nd of the cell growth and attained its optimal level on day 5th when the cells were at their mid-log phase. No siderophore production was, however, recorded on day 2nd at all the concentrations of iron tested. The production of siderophore in A. cylindrica further increased with increase in iron concentration and attained its optimum level on day 5th at 60 microM iron. A. cylindrica cells took at least 3 days for initiation of siderophore production and produced about 60% siderophore on day 5th even under iron-starved condition. A. cylindrica produced dihydroxamate type of siderophore.

Iron induced metabolic changes in the diazotrophic cyanobacterium Anabaena PCC 7120.

Iron induced changes in growth, N2-fixation, CO2 fixation and photosynthetic activity were studied in a diazotrophic cyanobacterium Anabaena PCC 7120. Iron at 50 microM concentration supported the maximum growth, heterocyst frequency, CO2 fixation, photosystem I (PS I), photosystem II (PS II) and nitrogenase activities in the organism. Higher concentration of iron inhibited these processes. Chl a and PS II activities were more sensitive to iron than the protein and PS I activity.