Growth In Presence Research Articles

IMPACT OF BIOGENIC CARBON NANOFIBER ON SEED GERMINATION AND SEEDLING GROWTH OF JOWAR (SORGHUM BICOLOR) AND CHICKPEA (CICER ARIETENUM)

The present work was started with an intention to use biogenic Carbon Nanofiber (CNF) for slow release of fertilizer NPK. Prior to using CNF loaded with fertilizer, it was imperative to know the desired level of CNF to be used that is suitable for plant growth. Hence, the aim of current research is to investigate the impact of CNF on seed germination and seedling growth using Jowar (Sorghum bicolor) a monocot and Chick pea (Cicer arietenum) a dicot crop. The parameters, to observe the seedling growth in presence of different concentrations of CNF (0.5 to 15 ppm CNF in Soilrites); included percentage germination and seedling vigor, seedling growth (shoot and root length as well as number of leaves and lateral root), mitotic index, auxin level, and primary metabolites of the seedlings. Presence of CNF in soil was inhibitory to Jowar seeds , where as it promoted germination percentage of Chickpea. Once the seed germinated seedlings of both Jowar and Chickpea showed positive response in morphogenic growth, in Mitotic Index, Chlorophyll content as well as primary metabolites. Chickpea was found to be more synergistic to CNF than Jowar.

Effects of graphene oxide on the diatom Nitzschia palea are associated with carbon cycling disturbance

Graphene based nanomaterials (GBMs) have been drawing the attention of the scientific communities these past years. As their market is increasing every year, their potential environmental and health risk are to be assessed. As microbial communities represent the basis of every ecosystem, it is essential to evaluate the risks of GBMs on these communities. The effects of GBMs on bacteria has been widely studied, while the effects on phototrophic species are less represented. In this study, the diatom Nitzschia palea was exposed to graphene oxide (GO) and reduced graphene oxide (rGO), at 0.1, 1 and 10 mg L−1. rGO had no effect on the diatom while GO induced an increase in growth, indicating the importance of the oxidation rate in the observed effect. Further results showed that shading effect of GO was countered by increased chlorophyll contents and by the accumulation of GO into the biofilm. This “sticking” mechanism increased the proximity between the biofilm and the GO, which might favour interactions between GO and the biofilm. These interactions led to the increase of defects and the reduction of GO. In addition, increased heterotrophic activity was suggested. To our knowledge, no diatom before Nitzschia palea has been shown to enhance its growth in presence of a GBM, but also capable to modify it. These results demonstrate the potential of GBMs, and in particular those with higher oxidation rates, to disrupt the contribution of the diatom Nitzschia palea to carbon cycling, which could have broader consequences at ecosystem scale.

Deletion of yghZ in Escherichia coli promotes growth in presence of furfural with xylose as carbon source.

Thermo-acidic pretreatment of lignocellulosic biomass is required to make it amenable to microbial metabolism and results in generation of furfural due to breakdown of pentose sugars. Furfural is toxic to microbial metabolism and results in reduced microbial productivity and increased production costs. This study asks if deletion of yghZ gene which encodes a NADPH-dependent aldehyde reductase enzyme results in improved furfural tolerance in Escherichia coli host. The ∆yghZ strain-SSK201-was tested for tolerance to furfural in presence of 5% xylose as a carbon source in AM1 minimal medium. At 96h and in presence of 1.0g/L furfural, the culture harboring strain SSK201 displayed 4.5-fold higher biomass, 2-fold lower furfural concentration and 15.75-fold higher specific growth rate (µ) as compared to the parent strain SSK42. The furfural tolerance advantage of SSK201 was retained when the carbon source was switched to glucose in AM1 medium and was lost in rich LB medium. The findings have potential to be scaled up to a hydrolysate culture medium, which contains furan inhibitors and lack nutritionally rich components, under bioreactor cultivation and observe growth advantage of the ∆yghZ host. It harbors potential to generate robust industrial strains which can convert lignocellulosic carbon into metabolites of interest in a cost-efficient manner.

Gamma irradiation in modulating arsenic bioremediation potential of Pseudomonas sp. AK1 and AK9

Purpose Present study deals with the role of gamma irradiation in modulating arsenic bioremediation of Pseudomonas sp. AK1 and AK9 strains Materials and methods The bacterial strains AK1 and AK9 of Pseudomonas sp. were irradiated at different doses (5 Gy, 10 Gy, 15 Gy and 20 Gy) of gamma irradiation. The effect of γ-irradiation on the growth and arsenic modulating ability of AK1 and AK9 strains was determined in the presence and absence of arsenic along with non-irradiated strains. Further, a comparative study of non-irradiated and irradiated strains by protein profiling in absence and presence of arsenic was carried out to confirm of the increased expression ofarsenite oxidase. Results Both strains were able to transform AsIII to AsV. Both strains AK1 and AK9 decrease the arsenic concentration by 626.68 ppb (13.36%) and 686.40 ppb (14.71%) after an incubation period of 96 h in presence of arsenic. Gamma irradiated AK9 strains showed doubled growth in presence of arsenic as compared to non-irradiated strains at 10 Gy treatment whereas no changes in growth was observed in irradiated AK1 strains. Gamma irradiated AK9 strain decrease 378.65 ppb (7.27%) more arsenic concentration from natural water sample supplemented with AsIII than non-irradiated AK9 strain. Further, in the protein profile, increased expression of arsenite oxidase (∼85 kDa) was observed in irradiated AK9 strains in presence of arsenic. Conclusions Overall, the results suggested that the gamma irradiated AK9 strain having potential for arsenic accumulation and increased arsenite tolerance may play a great role in the bioremediation of the arsenite at arsenic contaminated sites.

Chromium-stress alleviation study using plant growth promoting rhizobacteria for maize ( Zea mays L.)

Heavy metal contamination is one of the major environmental threats due to industrialization and urbanization. Among various heavy metals, chromium is of recent concern because it is considered the most hazardous metal pollutant in the environment. Its toxicity alters the process of germination and various other growth parameters ultimately affecting its yield. While maize (Zea mays L.) is one of the most widely cultivated cereal crop being used for fodder, feed and food purposes. It is multipurpose cereal crop and is also used as raw material for different industries. Hence, it is mandatory to come up with effective eco-friendly technique to remediate chromium (Cr) to protect the environment from its toxic impacts. During current research, plant microbe interaction was carried out with Cr resistant strains of Bacillus cereus (3a), Pseudomonas aeruginosa (DS4), Bacillus nitratireducens (TP8), Enterobacter cloacae (A9G) and Pseudomonas sp. (B3) that were selected to observe their beneficial impact on corn (Zea mays L.) growth in presence of Cr stress (150 & 300 µg/mL). Results have indicated that growth and biochemical parameters were enhanced due to bacterial inoculation. In comparison to control, maximum increment in shoot length, number of leaves, root length and fresh weight of inoculated plants was noted up to 46, 115, 76, and 42% respectively. Maximum increment in protein and chlorophyll content of inoculated plants was noted up to 304 and 71% respectively as compared to control. The present study suggests the use of above-mentioned highly chromium resistant bacterial strains to remediate chromium contaminated sites and to improve agricultural production.

Features of diagnosing ovarian tumors in women of pre- and postmenopausal age

Currently, one of the main ways to fight cancer, which can improve the results of treatment of ovarian neoplasms, is screening. Presently, the issue of organizing and conducting preventive examinations of women, including those of reproductive age, is one of the most urgent problems of primary health care institutions. The subjects of the study were 168 pre- and postmenopausal patients aged 20 to 60 years with ovarian tumors suspected of oncological pathology, who received treatment on the basis of the Tashkent city branch of the Republican Specialized Scientific and Practical Medical Center of Oncology and Radiology for the period from 2018 to 2022, taking into account the selected age interval. An assessment was made of laboratory research methods, such as: general blood count, biochemical blood test, general urinalysis, tumor-associated marker CA-125, HE-4. In the comparative analysis of risk factors, when ovarian tumors develop in pre- and postmenopausal women, malignant and borderline ovarian tumors have complaints, parity, gynecological anamnesis, and the presence of extragenital diseases, which do not have specific characteristics for malignant or borderline tumors. therefore, it does not provide sufficient information in the process of diagnosing ovarian tumors. The sonographic characteristics associated with the degree of ovarian tumor malignancy were examined, and the tumor had a solid component (p <0.001), the presence of obstructions (p = 0.0005), and the presence of growth on the inner surface of the capsule (p <0.001), the presence of a significant amount of free fluid in the pelvic cavity (p <0.001), the roughness of the surface of the tumor capsule (p < 0.001) were observed to be characteristic of more dangerous processes.

Efficient utilization of monosaccharides from agri-food byproducts supports Chlorella vulgaris biomass production under mixotrophic conditions

Microalgae are promising resources for the sustainable production of biofuels, feed, and high-value chemicals. Several strains can grow heterotrophically or mixotrophically on multiple organic substrates even if the high cost associated to their use can hinder scalability and economical sustainability of the overall process. The use of agri-food waste biomass hydrolysates might make the cultivation procedure more sustainable, while at the same time valorising underutilized by-products. In this study, Chlorella vulgaris biomass production and sugar utilization was investigated during mixotrophic cultivation on hydrolysates of two inexpensive and widely available recalcitrant agri-food waste biomasses: barley straw (BS) and citrus processing waste (CPW). CPW hydrolysate supported enhanced biomass production, compared to BS digestate, likely because of the presence, besides glucose, of significant amounts of galactose, which is rapidly metabolized by the algae. Notably, when pure monosaccharides were provided as sole organic carbon, growth stopped before complete sugar consumption. Arrested growth in presence of pure monosaccharides correlated with a drastic drop in extracellular pH, which appears to depend on both carbon and nitrogen sources. Our results show that mixotrophic cultivation of C. vulgaris on BS or CPW hydrolysates results in more efficient conversion of organic carbon into biomass, compared to growth on pure sugars, indicating that these agri-food by-products can be utilized as valid feedstocks for sustainable algal biomass production.

On the basic mechanism of grain growth: the role of texture on grain boundary migration rate

In this paper we will review some of the many achievements of Statistical Theory of Grain Growth (which is 40 years old, this year!), based on the classic law of grain growth. For instance, we will show that grain growth in presence of texture (which is the usual feature in a real microstructure) is not exclusively depending on the curvature of the grain boundary, as in this case the effect of curvature at the vertexes (in 2-D case) contributes as well (which, depending on the texture pattern, sometimes may be more relevant than curvature along the boundary). Such phenomenon requires a reformulation of Von Neuman’s equation in 2-D by involving, beside the different boundary mobilities, the different energies of the “third” grain boundary, which is pulling the vertex and inducing an extra curvature which is not balanced along the grain perimeter (for simplicity’s sake we are referring to a 2-D case, but the analysis can also be done in 3-D). We can then observe that boundary movement is not only depending on a couple of grains in contact (with the boundary curvature acting like in a bicrystal) but also includes the network of “third” grains operating at the vertexes. The overall consequence is that the growth kinetics and the grain size distribution shape are unique and variable for each texture component which contradicts classic growth laws as well as the expected results for the whole grain size distribution.

The Effect of R&D on Economic Growth: Evidence from Cross-Country Panel Data

ABSTRACT: Research and Development (R&D) in particular and innovation in general are the best drivers of long-run sustainable economic growth and spending in R&D has been recognized as one of the means to the economic accomplishment of both developed and developing countries. However, the sustainability of the association between R&D & economic growth exclusively depends upon the performance of other macroeconomic determinants. Hence, we examine the effect of R&D on economic growth in the existence of five important macroeconomic determinants. The study focusses on 151 selected countries, including both developed and developing, over the period 1996-2020 and focused on the macro-level analysis. Our research is based on the deployment of system Generalized Method of Moments (GMM) technique. The GMM technique encompasses longitudinal data; and is gathered by pooling time-series across a pool of cross-sectional units, specifically country-wise. The biggest advantage of using the GMM technique is that it allows for addressing the endogeneity problem using lagged explanatory variables as instrumental variables. We have three samples in our analysis, namely pool of developed countries, pool of developing countries, and the pool of both developed and developing countries. Our study deploys four proxies of R&D to work the nexus between R&D and economic growth in presence of five important macroeconomic determinants. In each of these three samples, we run four GMM models, depending upon the deployment of four R&D activities that we used in this study. We observe an evidence that R&D plays a significant role in economic growth when the selected macroeconomic determinants are used as control variables. Our findings are mostly robust to R&D specifications, country specifications, model specifications, and estimation strategies. Most importantly, the effect of lagged economic growth is highly positive, signifying that economies with higher economic growth in the previous years tend to grow faster in presence of R&D intensity. The behaviour of other macroeconomic variables is having diverse nature. Some of these variables behave positively, while others behave negatively. This study suggests that policymakers should focus on improving R&D activities and strengthening the chosen macroeconomic determinants to facilitate economic development. Hence, it contributes to the ongoing policy debate, that is with reference to R&D effect on economic growth, on the finest strategies for attaining sustainable economic growth in all these selected countries. Hence, we can use these findings to develop a targeted policy that promotes R&D intensity in the phases of economic development.

Microbial Induced Calcite Precipitation (MICP) Potential of Ureolytic Bacillus sp. Isolated from the Soil of Eroded Ecosystems for Stabilizing and Improving the Fertility of Eroded Soils

The loss of soil from lands due to erosion has a negative effect on ecosystems and food security. Bacillus due to high catabolic capability is an appropriate candidate for application in biocementation process. The aim of this study is isolate and characterize Bacillus sp. with biocementation capability from various ecosystems. The isolates were separated from 400 samples, and characterized by biochemical and molecular methods include the amplification and sequencing analysis of gyrA and 16S rRNA genes. Growth in presence of urea, in different salinity, pH, and temperature, also scanning electron microscope (SEM), X-ray diffraction (XRD), and wind tunnel analysis were applied to determine biocementation ability. A total number of 195 isolates were recovered from environmental samples, of which 25 isolates (12.82%) were identified as urease-positive Bacillus which belonged to 10 species consisting of Bacillus subtilis five strains (20%), Bacillus vallismortis and Bacillus seohaeanensis four strains (16%) each, Bacillus mobilis, Bacillus pseudofirmus, Bacillus cohnii, Bacillus cereus, Bacillus alkalinitrilicus two strains (8%) each, and Bacillus sphaericus and Bacillus megaterium one strain (4%) each. Moreover, 15 urease-positive isolates (7.7%) belonging to Ralostenia, Actinomycete, and Halomonas genera were identified. Optimum conditions for microbial induced calcite precipitation (MICP) by isolates are 30 °C, pH 9, and 6% salinity. The highest rate of calcium carbonate formation and urease activity recorded in B. subtilis with 24.15 mg/mL of calcium carbonate and 4.40 × 103 unit/L of urease, followed by B. mobilis and B. alkalinitrilicus with 22.85 mg/mL of calcium carbonate and 3.93 × 103 unit/L of urease. After MICP the lowest soil loss ratio at a flow rate of 90 km/h, was observed in B. subtilis 100-fold reduction, followed by B. seohaeanensis, B. cereus, B. vallismortis, with 90, 85, 80-folds reduction, respectively. Results indicate that the diversity of Bacillus sp. offers the potential ability for adaptation to harsh and untapped environments, also showed that the use of MICP on the soil surface can have a very significant role in reducing soil losses due to wind erosion.

Bacillus cabrialesii subsp. cabrialesii subsp. nov. and Bacillus cabrialesii subsp. tritici subsp. nov., plant growth-promoting bacteria and biological control agents isolated from wheat (Triticum turgidum subsp. durum) in the Yaqui Valley, Mexico.

Strain TSO2T, a plant growth-promoting rhizobacteria and biological control agent, was isolated from wheat rhizosphere sampled from the Yaqui Valley in Mexico. The strain was identified using a polyphasic approach. Based on its analysis of the full-length 16S rRNA gene, strain TSO2T was assigned to the genus Bacillus , which was supported by morphological and metabolic traits, such as Gram-positive staining, rod shape, spore formation, strictly aerobic metabolism, catalase-positive activity, starch, and casein hydrolysis, reduction of nitrate to nitrite, growth in presence of lysozyme and 2 % NaCl, citrate utilization, growth at pH 6.0, acid production from glucose and indole production from tryptophan. Additionally, strain TSO2T possesses swarming motility, presenting a featureless mat pattern that can cover the whole petri dish. The whole-genome phylogenetic relationship analysis elucidated that strain TSO2T is closely related to Bacillus cabrialesii TE3T. The maximum values for average nucleotide identity (ANI) and in silico DNA–DNA hybridization from the genome-to-genome distance calculator (GGDC) were 97 and 73.4 %, respectively, related to Bacillus cabrialesii TE3T, where both ANI and GGDC values were barely above the species delimitation threshold, but below the subspecies limit. Also, strain TSO2T showed the ability to produce a fatty acid (C18 : 0) that is not present in closely related Bacillus species. These results provide evidence that strain TSO2T is a novel subspecies of the species Bacillus cabrialesii , for which the name Bacillus cabrialesii subsp. tritici subsp. nov. is proposed. The type strain of Bacillus cabrialesii subsp. tritici subsp. nov. is TSO2T (CM-CNRG TB52T=LBPCV TSO2T). The description of this novel subspecies automatically creates the subspecies Bacillus cabrialesii subsp. cabrialesii subsp. nov. for which the type strain is TE3T (CM-CNRG TB54T=CCStamb A1T).

Antibiotic-resistant bacteria in hospital wastewater treatment plant effluent and the possible consequences of its reuse in agricultural irrigation.

Wastewater from hospitals should be monitored precisely and treated properly before discharge and reuse to avoid epidemic and pandemic complications, as it contains hazardous pollutants for the ecosystem. Antibiotic residues in treated hospital wastewater effluents constitute a major environmental concern since they resist various wastewater treatment processes. The emergence and spread of multi-drug-resistant bacteria, that cause public health problems, are therefore always a major concern. The aims and objectives of this study were mainly to characterize the chemical and microbial properties of the hospital effluent of wastewater treatment plant (WWTP) before discharge to the environment. Special attention was paid to the presence of multiple resistant bacteria and the effects of hospital effluent reuse in irrigation on zucchini as an economically important plant. The risk of cell-free DNA carrying antibiotic resistance genes contained in the hospital effluent as a long-lasting hazard had been discussed. In this study, 21 bacterial strains were isolated from the effluent of a hospital WWTP. Isolated bacteria were evaluated for multi-drug resistance ability against 5 antibiotics (Tetracycline, Ampicillin, Amoxicillin, Chloramphenicol, and Erythromycin) at a concentration of 25 ppm. Out of them, three isolates (AH-03, AH-07, and AH-13) were selected because they recorded the highest growth in presence of tested antibiotics. Selected isolates were identified using 16S rRNA gene sequence homology as Staphylococcus haemolyticus (AH-03), Enterococcus faecalis (AH-07), and Escherichia coli (AH-13). Their susceptibility to ascending concentrations of tested antibiotics indicated that they were all susceptible at a concentration above 50 ppm. Results of the greenhouse experiment regarding the effect of hospital WWTP effluent reuse on zucchini plant fresh weights compared to that irrigated with fresh water indicated that the former recorded a limited increase in total fresh weights (6.2 g and 5.3 g/plant, respectively). Our results demonstrated the low impact of the reuse of Hospital WWTP effluent in agriculture irrigation compared to its greater risk in transferring multiple antibiotic bacteria and antibiotic resistance genes to soil bacteria through natural transformation.

SDS-promoted methane hydrate growth in presence of a superhydrophobic substrate

As one of the most efficient promoters for methane hydrate formation, SDS (sodium dodecyl sulfate) works mainly by causing the hydrates to grow upwards along the reactor sidewall. In this work, super-hydrophobic surface was constructed and adopted for methane hydrate formation, in the aim of revealing the promotion mechanism of SDS. Morphological observations showed that SDS led to violent fluctuation at the gas/liquid interface, which represented the unstable state of the gas/liquid interface during the initial hydrate growth process and reached stable via morphology transformation, either upward growth or outward diffusion, leading to the surface growth of methane hydrates. In-situ Raman Spectra revealed that the fluctuation structure was the combination of water, hydrate mass with cages minorly occupied by methane molecules, and methane hydrates; and with the continuation of the fluctuation phenomenon, the water percentage decreased, the hydrate mass increased and then transformed to methane hydrates gradually.

Effects of anaerobic and respiratory adaptation of Lacticaseibacillus casei N87 on fermented sausages production

Lacticaseibacillus casei N87 was used as starter culture for the production of fermented sausages. The strain was cultivated in anaerobic (A) and respiratory (growth in presence of oxygen and supplementation with haeme and menaquinone in the growth medium; R) conditions. Control without the starter culture inoculation and with the addition of 150 mg/kg of nitrate was also included. The effect on physico-chemical parameters (pH, Aw, weight loss, and color), microbial population, volatilome, proteolysis as well as the survival of the strain was evaluated during 90 days of ripening. Q-PCR and DGGE-PCR analyses demonstrated the ability of the strain used in this study to adapt to this environment and carry out the sausage's fermentation process. The inoculation of the strain did not have any effect on the Aw values, which decreased similarly in the different samples whereas the pH was lower in A samples (5.2) and the weight loss in R samples (2.5% less than the others). The color parameters of the samples inoculated with the starter cultures were comparable to those of the control added with nitrate. The concentration of aldehydes that usually are identified as marker of oxidation processes was similar in the samples inoculated with the starter cultures adapted under respiratory conditions and in the control. On the contrary, a higher level was detected in the samples inoculated with the starter cultivated under anaerobic conditions. The proteolysis that occurred during the ripening indicates the differentiation of the A samples from the others. Nonetheless, the volatile profiles of the inoculated fermented sausages were similar. The study demonstrated that aerobic adaptation of Lcb. casei N87 starter culture gave similar color parameters and amounts of aldehydes in sausages fermentations without nitrate compared to conventional fermentations with nitrate.

Evaluation of the influence of the analytical characteristics of the microbiological blood study in bacteremia in a multidisciplinary hospital.

The culture method continues to be the "gold" standard for microbiological diagnosis of bloodstream infections. This is primarily due to the fact that the definition of the etiology of a generalized infectious process determines the etiotropic antibiotic therapy. To do this, it is necessary to conduct periodic microbiological monitoring of the prevailing microflora. To do this, in the present study, a retrospective analysis of the results of a microbiological blood test for sterility was performed in case of suspected bloodstream infections in a multidisciplinary hospital to assess the influence of analytical stage factors on the laboratory data obtained. Automatic hematological cultivators were used, identification was carried out based on the biochemical characteristics of microorganisms, as well as using time-of-flight mass spectrometry with matrix-activated laser desorption / ionization (MALDI-TOF MS). More than 10,000 research results were analyzed, the average microflora seeding rate was 15.1%. The analysis of the isolated microflora was carried out in 2 groups of positive results: at the beginning, the data obtained in the presence of growth in two vials at once were evaluated, then the positive results of blood cultures obtained in any one vial from a pair were studied. The predominance of gram-positive flora in the structure of microorganisms isolated from whole blood was revealed, the influence of cultivation conditions and the composition of thenutrient medium on the isolated flora was not found, however, a number of microorganisms, due to the specific characteristics of metabolism, were characterized by growth under strictly defined cultivation conditions. The presented study actualizes the need for constant microbiological monitoring in order to determine the prevailing hospital microflora, which can contribute to a timely response in order to limit the spread of highly virulent, aggressive, resistant strains of microorganisms leading to the development of generalized bloodstream infections.

Notch signaling regulates vasculogenic mimicry and promotes cell morphogenesis and the epithelial-to-mesenchymal transition in pancreatic ductal adenocarcinoma.

Vasculogenic mimicry (VM) is the process where cancer cells adopt endothelial characteristics by forming tube-like structures and perfusing channels. This phenomenon has been demonstrated in several types of solid tumors and associated with the growth and survival of tumor cells. In this study, we investigated the presence of VM formation in human pancreatic ductal adenocarcinoma (PDAC) and elucidated the molecular mechanisms underlying the VM process. In human PDAC tissues, CD31-negative, periodic acid-Schiff (PAS)-positive channels were predominantly found in desmoplastic areas, which are generally also hypovascularized. We found a positive correlation of VM capacity to tumor size and NOTCH1 expression and nuclear localization with statistical significance, implicating that Notch activity is involved with VM formation. Additionally, our data showed that the presence of growth or angiogenic factors significantly increased Notch activity in PDAC cell lines and upregulated several mesenchymal marker genes, such as TWIST1 and SNAI1, which can be inhibited by a gamma-secretase inhibitor. Our data showed that Notch signaling plays an important role in inducing VM formation in PDAC by promoting the epithelial-to-mesenchymal transition process.

STUDY OF IN-VITRO PROBIOTIC PROPERTIES AND ANTIBIOTIC RESISTANCE IN LACTOBACILLI ISOLATED FROM COMMERCIAL PROBIOTIC PRODUCTS IN PAKISTAN

The aim of the study was analysis of in-vitro probiotic properties and antibiotic resistance in lactobacilli isolated from commercial probiotic products from Pakistan. Lactobacilli were identified by biochemical testing and genus specific polymerase chain reaction. Probiotic properties including tolerance to low pH and bile salts, auto-aggregation, co-aggregation and antimicrobialactivity, and antibiotic resistance pattern of all isolates was determined. A total of 14 lactobacilli isolates were recovered from nine products while three products had no lactobacilli. All isolates except AB6 were tolerant to acidic condition (pH: 2). All isolates except AB13 showed growth in presence of bile salts (0.5%). Lactobacilli showed variable auto-aggregation (01-97%) and co-aggregation with E. coli and S. enteritidis (37.5±7.7-92.4±7.3 and 31.6±6.4-95.8±4.0, respectively). Nine isolates showed activity against S. enteritidis while six isolates had activity against E. coli. Lactobacilli showed higher level of resistance to meropenem (100%), imipenem (92.85%), polymyxin B (92.85%), kanamycin (92.85%) and aztreonam (78.75%), intermediate level of resistance to vancomycin (64.2%), gentamycin (57.14%) and ciprofloxacin (42.85%), low level of resistance to ampicillin (35.71%), bacitracin (35.71%), penicillin (28.5%) and tetracycline (28.50%), and no resistance to erythromycin and chloramphenicol. It was concluded that transferable antibiotic resistance is present in commercial probiotics which may pose a threat to public safety.

ПОЛОВЫЕ РАЗЛИЧИЯ В СОДЕРЖАНИИ СТЕРОИДНЫХ ГОРМОНОВ В МИТОХОНДРИЯХ КЛЕТОК СЕРДЦА НА ЭТАПАХ РАЗВИТИЯ МЕЛАНОМЫ В16/F10, СОПРЯЖЕННОЙ С ХРОНИЧЕСКОЙ НЕЙРОГЕННОЙ БОЛЬЮ

Aim - an analysis of levels of steroid hormones in heart cell mitochondria at the stages of B16/F10 melanoma development in combination with chronic neurogenic pain in male and female C57BL/6 mice. The study included male and female C57BL/6 mice (n=336). Experimental groups were: intact animals (♂ n=21; ♀ n=21); controls (♂ n=21; ♀ n=21) with a model of chronic neurogenic pain (CNP); the comparison group (♂ n=63; ♀ n=63) with melanomas (B16/ F10); the main group (♂ n=63; ♀ n=63) (CNP+B16/F10) with melanoma transplanted 3 weeks after the CNP model creation. Levels of estradiol (pg/g protein), estrone (pg/g protein), progesterone (ng/g protein), total testosterone (ng/g protein), and free testosterone (pg/g protein) were determined by ELISA in mitochondrial samples. In animals with CNP, changes in levels of steroid hormones were detected only in heart mitochondria of female mice: estradiol was reduced by 4.6 times, estrone by 2.2 times, progesterone by 1.8 times (p˂0.05), and total testosterone by 2.4 times compared with intact values. Melanoma growth (3 weeks) in females downregulated levels of estradiol by 1.7 times (p˂0.05), estrone by 1.8 times (p˂0.05), progesterone by 2.1 times, and total testosterone by 2.3 times compared with intact values. In males, only total testosterone decreased by 2.1 times during the same period. Melanoma growth in presence of CNP (3 weeks) in females decreased levels of estradiol by 1.6 times (p˂0.05) compared with control val- ues, while males showed reduced levels of estradiol and total and free testosterone by 1.3 times (p˂0.05), 1.9 times (p˂0.05) and 2.7 times, respectively, as well as elevated levels of estrone by 1.6 times (p˂0.05). CNP and the growth of B16/F10 melanoma to a greater extent weaken the heart of females due to the involvement of a wider spectrum of hormones and a decrease in their levels in the heart mitochondria, compared to males. When CNP was combined with B16/F10 melanoma, a more significant hormonal imbalance was determined in males than in females.

The Potential of 3,6 Dihydroxyflavone Embedded Gold Nanoparticles for Inhibition of Tumor Growth in Presence of Dietary Supplements

The Potential of 3,6 Dihydroxyflavone Embedded Gold Nanoparticles for Inhibition of Tumor Growth in Presence of Dietary Supplements

Simultaneous influence of Mg2+ and Sc3+ co-doping on upconversion luminescence and optical thermometry in β-NaYF4: Yb3+/Ho3+ microphosphor

A series of xMg2+/ySc3+ co-doped β-NaYF4:0.2Yb3+/0.02Ho3+ (x = y = 0 −0.2) upconversion (UC) green phosphors are synthesized using EDTA-assisted hydrothermal method. The structure, morphology and elemental compositions are investigated in detail using different experimental techniques. The lengthwise suppression of crystal due to co-doping is associated to the kinetics involved in the crystal growth in presence of Mg2+/Sc3+. The effect of Mg2+/Sc3+ co-doping on the UC green emission of β-NaYF4:0.2Yb3+/0.02Ho3+ microphosphors is studied and about 31-fold enhancement in the green emission (5F4,5S2→5I8) is observed for the 0.08Mg2+/0.12Sc3+ co-doped phosphor. The downconversion properties of the phosphors is also discussed to showcase the dual mode luminescence. The temperature sensing performance is investigated using luminescence intensity ratio (LIR) technique for non-thermally coupled levels (5F5/5F4,5S2) of Ho3+ ions and maximum relative sensitivity of 0.258% K−1 at 374 K is obtained for the optimized phosphor. The microphosphor can be sustained at high temperature as the UC emission intensity retains about 65% and 36% at 423 K and 574 K. From chromaticity diagram, the maximum color purity of 91.37% is obtained for 0.08Mg2+/0.12Sc3+ doping concentration. The estimated thermal parameters and color purity of Mg2+/Sc3+ co-doped β-NaYF4:0.2Yb3+/0.02Ho3+ UC phosphors suggest their applicability in fabricating temperature sensors and LEDs.