The uncertain climate footprint of wetlands under human pressure.

Significant climate risks are associated with a positive carbon-temperature feedback in northern latitude carbon-rich ecosystems, making an accurate analysis of human impacts on the net greenhouse gas balance of wetlands a priority. Here, we provide a coherent assessment of the climate footprint of a network of wetland sites based on simultaneous and quasi-continuous ecosystem observations of CO2 and CH4 fluxes. Experimental areas are located both in natural and in managed wetlands and cover a wide range of climatic regions, ecosystem types, and management practices. Based on direct observations we predict that sustained CH4 emissions in natural ecosystems are in the long term (i.e., several centuries) typically offset by CO2 uptake, although with large spatiotemporal variability. Using a space-for-time analogy across ecological and climatic gradients, we represent the chronosequence from natural to managed conditions to quantify the "cost" of CH4 emissions for the benefit of net carbon sequestration. With a sustained pulse-response radiative forcing model, we found a significant increase in atmospheric forcing due to land management, in particular for wetland converted to cropland. Our results quantify the role of human activities on the climate footprint of northern wetlands and call for development of active mitigation strategies for managed wetlands and new guidelines of the Intergovernmental Panel on Climate Change (IPCC) accounting for both sustained CH4 emissions and cumulative CO2 exchange.

Knowledge, Attitude and Practice of Research Ethics among Researchers in Nepal.

INTRODUCTION: The universal health research ethical principles must be adhered to ensure a balance between science and safeguarding participants' rights, safety and dignity. A cross-sectional study was conducted to assess the knowledge, attitude, and practice of research ethics among researchers in Nepal. METHODS: The study was carried out among 449 researchers who submitted proposals for ethical review and approval from the Ethical Review Board of the Nepal Health Research Council between January 2017 to August 2021. Simple random sampling was done ensuring a proportional representation of researchers from all areas of health research. A structured questionnaire was administered online for data collection. RESULTS: The participants aged between 23-80 years old consented to complete the survey questionnaire. The median age of the respondents was 35 (23-80) years. Among all the respondents, 52 (11.58%) were unaware about the National Ethical Guideline for Health Research. Similarly, 110 (24.50%) respondents strongly agreed that the ethical review process impairs research and makes it harder for researchers to conduct research; 372 (82.85%) respondents had pursued research activity only after obtaining ethical approval. CONCLUSIONS: Half of the respondents had knowledge on different aspects of research ethics.

A Review on exploring the potential of vincamine alone and along with melatonin as an effective anti-depressant agent.

BACKGROUND: Depression is a prevalent psychiatric disorder and one of the leading causes of disability around the world. Herbal and synthetic medications used to treat depression, may interrupt the therapy process and cause adverse effects. Currently, the use of medicinal and phytochemical plants, which have various therapeutic effects and has potential strategy for treating depression. According to the studies, medicinal plants have a variety of effects on the brain system and have antidepressant properties such as synaptic modulation of serotonin, noradrenalin and dopamine as well as inflammatory mediators. According to the literature review, Vinca Rosea extract has a variety of pharmacological activities, but there is no evidence of its antidepressant properties. OBJECTIVES: The main aim of the present study is to gather data from the literature review regarding the antidepressant activity of vincamine alone and along with melatonin. METHOD: According to the review antidepressant activity of various medications can be tested using two different types of studies, including in-vivo and in-vitro. RESULT: Clinical and preclinical research suggests that one of the main mediators in the pathophysiology of depression seems to be stress. Depression can be evaluated using experimental methods based on a variety of physical indicators, including locomotor activity, rearing, faeces, and the quantity of entries in the centre square (in-vivo and in-vitro). Biological conditions can be used to find it as well. It has been successfully concluded that vincamine, either alone or in combination with melatonin, may provide a potential role as an antidepressant. CONCLUSION: According to the Globe Health Organization, depression will become the most common cause of loss of interest in working in the world. As a result, depression research is one of the most significant ways in which we might create new treatments in the form of vincamine and combination with melatonin for depression and improve existing therapies to make them work better for depressed people. It will also aid in the development and creation of novel ways for the better treatment of depression.

An Insight through Various Models being used for Assessment of Depression and its Management at Primary Level in Current Scenario.

AIM: The main aim of present study to assess depression and various neurotransmitters involved in it with their evaluating models. BACKGROUND: Depression is a common ailment that can be recurrent or even become chronic. According to the National Service Framework for Mental Health (released in 1999 by the Department of Health), people with depression should continue to be treated primarily in primary care settings. Despite mounting evidence that general practitioners could do a better job of detecting and treating depression, little research has been done on the perspectives of general practitioners who treat patients who are depressed. Depression (major depressive disorder) is a widespread and significant medical condition that has a negative impact on feeling, thinking, and behaviour. OBJECTIVES: The primary goal of this study was to gather data on depression, as well as to discuss several methods for evaluating antidepressant drug response based on physical activities and neurotransmitters. METHODS: Antidepressant activity of various medications can be tested using two different types of studies, including in vivo and in vitro, according to the review. RESULTS: Depression is characterized by a persistent sense of sadness, insomnia, lack of concentration, slowness in activity, restlessness, social isolation and a loss of interest that prevents you from doing normal things. There are several types of depression, with symptoms ranging from mild to severe. Depression is caused by a combination of factors and conditions, rather than a single factor. Major depression is a mental condition marked by feelings of inadequacy, hopelessness, decreased activity, sadness and mood swings, which seriously disrupt and negatively affect a person's life, sometimes, leading to suicidal thoughts. The quest for a better understanding of the causes of depression and the development of more effective treatments is critical. According to clinical and preclinical research, stress appears to be a crucial mediator in the pathophysiology of depression. Using experimental models, depression may be assessed based on several physical parameters such as locomotor activity, rearing, defecation, and the number of centre square entries (in vivo and in vitro). Biological parameters may also be used to locate it. CONCLUSION: Unhappiness and loss of interest in previously enjoyed activities are the symptoms of depression. It can cause emotional and physical problems, as well as a decrease in the ability to function together at work and at home. Finally it has been concluded that various neurotransmitters are involved in depression at the synaptic cleft which can be controlled using various synthetic and herbal drugs through in vitro and in vivo evaluating models.

B-Map: a fuzzy-based model to detect foreign objects in a brain.

To cope up with the medical complications, scientists and physicians rely more on digitized historical evidence. It helps them to identify the disease and to develop new drugs and strategies. The authors have designed a model called B-Map. It can detect and segmenting any foreign object in the brain using fuzzy rules. The model can detect objects such as cancer and brain tumor. The proposed work aims at designing a classifier. The classifier would help to detect all possible foreign objects using one application. B-Map has been compared with benchmark algorithms such as K-means and ANN. It was found that the proposed model performs significantly better than the current techniques. Original patients' sample reports are taken from various medical laboratories. The figure numbers are retained as in the paper. The proposed model is able to find the edges and segment different types of foreign objects or one can say unexpected developments. Figure 12 shows the outer edges of a section of a brain MRI. The patient's MRI very clearly shows Hydrocephalus. The same is segmented and shown in Fig. 13. Figure 14 shows a segment of benign development and 15 shows a cancerous development which are again successfully segmented by the proposed model. The data on which testing is done is clinical data of the original patients. As the patient's details and data cannot be shared the author's cannot upload the data in the repository. As soon as the research completes, a benchmark dataset will be created and uploaded in public domain so that researchers can access it.

Ethical Characteristics of Research Proposals Related to COVID-19 Pandemic in Nepal: A Retrospective Review.

BACKGROUND: Public health emergency is vulnerable time where maintaining ethical principles is obligatory while doing research, on the other hand, it is the same time when breach in ethics is much likely whenever a researcher is unaware, unprepared or hastens to do research. The aim of this study was to assess ethical issues of the coronavirus disease 2019 (COVID-19) related research proposals submitted during the early stages of pandemic in Nepal. METHODS: Retrospective analysis of COVID-19 related research proposals and their informed consent document submitted to the ethical review board at Nepal Health Research Council was done for the study. The analysis was done as per the National Ethical Guidelines, Standard Operating Procedure for Health Research in Nepal and World Health Organization guidelines for infectious disease outbreak, 2016 under ethically relevant headings. Descriptive data were analyzed in SPSS v24. RESULTS: The major issues were observed in the informed consent documents where 55% were lacking principal investigator's contact information, 68% not having participant selection criteria, 70% without clear informed consent taking process, 57% without explanation of possible risks. Similarly, 68% of the interventional studies' consent form didn't mention possible adverse events and mitigation mechanisms. CONCLUSIONS: Most of the research proposals related to COVID-19 were devoid of major ethical elements which took longer time for receiving approval and eventually delayed the opportunity for evidence generation in critical time. More attention is needed to increase awareness and to develop capacity of researchers, reviewers, ethics committees and relevant stakeholders at the time of health emergencies.

An appraisal of cuticular wax of Calotropis procera (Ait.) R. Br.: Extraction, chemical composition, biosafety and application.

Plastic and polythene as hydrophobic materials become a grave concern due to their non-biodegradable nature, cumbersome recycling and waste management. Cuticular wax derived from Calotropis procera is explored as an eco-friendly and safe hydrophobic material. The effects of duration of exposure to solvent, solvent type, size and side of the leaf on cuticular wax yield have been studied. Leaf with the smallest area (10 cm2-25 cm2) was found to be the most suitable to isolate the wax. GC-MS analysis of the wax revealed that the wax consists of mainly esters, alkane and alkene. Mitochondrial reductase (MTT) and lactate dehydrogenase (LDH) assay have been carried out on M5S cell line at various concentrations and the results indicate that up to 1 µg/ml (acetone as solvent) and 3 µg/ml (chloroform as solvent) use of wax has no toxic effect. To evaluate the hydrophobic potential of the wax in developing hydrophobic paper water regains and contact angle has been measured. The gain in hydrophobicity of the paper is evident from the rise in contact angle (≥90˚) of paper coated with wax. Scanning electron micrograph and FTIR spectra generated physical and chemical evidence of coating of wax on paper.

Enhancement in the Neuroprotective Power of Riluzole Against Cerebral Ischemia Using a Brain Targeted Drug Delivery Vehicle.

Riluzole is the only available drug for motor neuron diseases quite well-known for its neuroprotective activity. But its poor aqueous solubility, short half-life with some side-effects at higher concentration poses a limitation to its use as a therapeutic agent. The present study was performed to investigate the therapeutic potential of nanoriluzole (NR), i.e., riluzole encapsulated in nanoparticles against cerebral ischemia (stroke) at three different concentrations [10 (NRL), 20 (NRM), and 40 (NRH) µg/kg body weight intraperitoneally (i.p.)]. Chitosan conjugated NIPAAM (N-isopropylacrylamide) nanoparticles coated with tween80 were synthesized through free radical polymerization. The particles were characterized with Transmission Electron Microscopy, Dynamic Light Scattering, and Fourier Transform Infrared spectroscopy and were found to have size of ∼50 nm. Cerebral ischemia was induced by Middle Cerebral Artery Occlusion (MCAO) model for 1 h and NR was given intraperitoneally after 1 h of MCAO. Animals were dissected after a reperfusion period of 24 h for evaluation of various parameters. Triphenyl tetrazolium chloride staining shows substantial reduction in infarct size in all three treated groups. It was also supported by histopathological results, biochemical parameters, and behavioral studies. Immunological parameters like NOS-2, NF-kB, and COX-2 also show profound reduction in expression in NR treated groups. Thus, the present work clearly demonstrated that the nanoparticle was good enough to carry large amount of drug across the Blood Brain Barrier which results in significant neuroprotection even at a very low concentration. It also substantially lowered the required concentration by overcoming the poor aqueous solubility; hence hardly leaving any scope for side-effects.

Nanoparticle Based Delivery of Quercetin for the Treatment of Carbon Tetrachloride Mediated Liver Cirrhosis in Rats.

Liver fibrosis is the common response to chronic liver injury and ultimately leads to cirrhosis. There is a pressing need in the pharmaceutical industry to develop efficient well-targeted drug delivery systems, which are lacking to date. This study was designed to investigate the efficacy of a nanoquercetin NQ; i.e., quercetin encapsulated in PAG (p-aminophenyl-1-thio-ß-D-galactopryranoside)-coated NIPAAM (N-isopropyl acrylamide) nanopolymer in liver compared with naked quercetin (Q) using a carbon tetrachloride (CCl4)-mediated liver cirrhosis model. NQ was more effective at restoring liver membrane integrity as indicated by significantly reduced serum markers, including Alanine Transaminase (ALT), Aspartate Aminotransferase (AST), Alkaline Phosphatase (ALP) and Lactate Dehydrogenase (LDH), compared with naked Q. The findings of reduced collagen and histopathology also show that the NQ effects were much better than those of naked Q. Biochemical parameters, including antioxidant defense enzymes, also provide supporting evidence. Furthermore, the decrease in NF-κB and NOS-2 expression in the NQ-treated groups was also much stronger than in the naked Q-treated group. Thus, the data clearly suggest that NQ not only provides significant hepatoprotection compared with naked Q, but it also substantially lowered the required concentration (1,000 to 10,000-fold lower) by increasing the bioavailability.

Deterioration in the renal function and risk of microalbuminuria after radical, simple and donor nephrectomy: A long-term outcome.

OBJECTIVES: Evaluation of deterioration in renal function and risk of micro albuminuria after radical, simple and donor nephrectomy. MATERIALS AND METHODS: A total of 594 patients underwent nephrectomy (159 radical, 318 simple and 117 donors) from February 2009 to December 2012 in our institute. First 300 eligible patients were divided in 3 groups, each having equalled number of patients. Group 1 was consisted of patients who underwent radical, group 2 had simple and group 3 had donor nephrectomy. These patients were followed up to February 2015. Follow up of all the patients were done at first month following the surgery and then in every six months subsequently. The follow up included the measurement of serum creatinine and urinary micro albumin in a spot urine sample. CKD-EPI equation was used for calculation of e GFR. RESULTS: At the end of our study, 35 patients (41.6%) in group 1 and 8 patients (8.69%) in group 2 developed CKD stage 3. During the follow-up period, 41% patients in group 1, 13% in group 2 and 4% in group 3 developed MA. CONCLUSION: Nephron-sparing surgery should be the standard treatment of renal tumors, wherever possible. There should be a regular follow up of the patients after radical, simple and donor nephrectomy because of risk of CKD. Early consultation with nephrologists should be done by the patients who are suffering from MA after nephrectomy.

Megalourethra with Y-Type Duplication of Urethra Presented as Perianal Fistula: A Rare Case Report.

Megalourethra with Y-type duplication is an extremely rare anomaly. We report here one such case, diagnosed with retrograde urethrogram, which was done from both penile meatus and perianal opening simultaneously. Patient was successfully treated by laser optical internal urethrotomy (OIU), excision of duplicated urethra, and reduction urethroplasty in a single stage.

Normal values of CD4 and CD8 lymphocyte subsets in healthy indian adults and the effects of sex, age, ethnicity, and smoking.

BACKGROUND: Information on lymphocyte populations (T, B, and natural killer cells) and subpopulations (CD4 and CD8) in India is generally lacking. Measurement of T-cell subsets is important in India for evaluating disease stage and progression in individuals with the human immunodeficiency virus (HIV). Hence, this study was conducted to provide normal ranges of absolute and percentage values of CD4 and CD8 T-lymphocyte subsets and the ratio of CD4 to CD8 in normal Indian adults. METHODS: Flow cytometric analysis (EPICS-XL) was used to determine the range of T-lymphocyte subpopulations in normal Indian blood donors at Command Hospital and the Armed Forces Medical College, Pune, India. The reference population consisted of 94 healthy HIV-seronegative blood donors. T-lymphocyte subsets were analyzed with two-color immunophenotyping of peripheral blood lymphocytes with the use of a lysed whole-blood technique and enumerated. RESULTS: For normal values of various blood components, we found mean values of 2114 cells/microl for total lymphocytes, 865 cells/microl (40.2%) for CD4(+) lymphocytes, 552 cells/microl (31.3%) for CD8(+) lymphocytes, and 1.7 for the CD4:CD8 ratio. The 95% confidence intervals for the same parameters were 1115-4009 cells/microl, 430-1740 cells/microl (30.75-49.60%), 218-1396 cells/microl (20.06-42.52%), and 0.39-3.02 respectively. Females had significantly higher CD4 counts (P < 0.05), percentage of CD4 lymphocytes (P < 0.01), and CD4:CD8 ratio (P < 0.01). Males had a significantly higher percentage of CD8 lymphocytes (P < 0.01). They also had higher CD8 counts that did not reach significance. Age, ethnicity (Dravidian versus Aryan), smoking, alcohol consumption, and the interval between drawing the blood sample and its analysis were factors that did not produce statistically significant differences in the T-cell subsets studied. CONCLUSIONS: When compared with other published series, the CD4 and CD8 values in healthy Indians were no different from those reported in the West. These observations have important clinical implications for the use of T-lymphocyte subset measurements in India, especially in the management of HIV infection. The normal ranges established by this study can be used as a reference for decisions made in clinical practice.

Comparison of CD4 and CD8 lymphocyte counts in HIV-negative pulmonary TB patients with those in normal blood donors and the effect of antitubercular treatment: hospital-based flow cytometric study.

BACKGROUND: This study was designed to flow cytometrically determine baseline and sequential values of CD4 and CD8 lymphocyte subsets in patients without the human immunodeficiency virus and with pulmonary tuberculosis (TB) and to correlate these values with those obtained from normal male blood donors and with the radiologic extent of disease and response to therapy. METHODS: We studied 39 male patients without the human immunodeficiency virus and with sputum positive for pulmonary TB who had been admitted to Military Hospital (Cardiothoracic Center) in Pune, India. Clinical, laboratory, and radiologic evaluations of these patients were done. Hematologic parameters were assessed by an automated hematology cell counter (AcT*Diff, Coulter), and T-cell subsets (CD4 and CD8) were determined flow cytometrically (EPICS-XL, Coulter). RESULTS: CD4 counts and percentages of CD4 were significantly lower, but CD8 values were normal, in patients with pulmonary TB when compared with values obtained in normal blood donors. The CD4/CD8 ratio was significantly lower in patients with TB. The CD4 counts normalized with antitubercular treatment. The radiologic extent of disease did not correlate well with the immune parameters studied. CONCLUSIONS: TB is a reversible cause of CD4 lymphocytopenia and is associated with normal numbers of CD8 cells. The radiologic extent of disease does not seem to determine the immune response.

Correlation of clinical and laboratory surrogate markers of immunodepletion with T cell subsets (CD4 & CD8) determined flow cytometrically in HIV infected patients: a hospital based study.

CD4 count is established in HIV medicine as a marker of immune depletion. However, due to financial constraints this facility is not readily available in India. Therefore, this cross sectional study in the setting of a government hospital in Pune evaluated 72 HIV infected patients for the surrogate markers of CD4 count by correlating CD counts with clinical and easily available laboratory parameters. Using a data extraction Performa, the epidemiological and clinical data of these patients was noted. Routine hematological parameters were determined. T cell subsets were studied by 2-color flow cytometry. These included CD4 counts, CD4 percentage, CD8 counts, CD8 percentage and CD4/CD8 ratio. Status of cell-mediated immunity was determined using a Multi test CMI device and Mantoux reactivity. beta2 microglobulin levels were determined in 50 of the patients. Immunological parameters were correlated with the clinical profile and other simple laboratory markers. Statistical analysis was done using regression coefficients and paired t tests. Patients who had lesser weights had lower CD4 and CD8 counts, ALC (absolute lymphocyte counts) and CD4%. Fall in hemoglobin was associated with low CD4 count, low ALC and low CD8. ALC levels correlated well with CD4 counts below 500 cells / cmm. Patients with anergic skin response to Mantoux testing and impaired cell mediated immunity had lower CD4 counts than those who had intact cell mediated immunity. beta2 microglobulin levels did not correlate well with declining immune dysfunction. However a significant inverse correlation was established between beta2 microglobulin and CD4%.

Nanothymoquinone, a novel hepatotargeted delivery system for treating CCl4 mediated hepatotoxicity in rats.

Thymoquinone (TQ) is the major active principle of Nigella sativa (N. sativa) which is widely being used as a hepatoprotective agent nowadays. However, toxicity at high doses with poor water solubility limit its usage as a therapeutic agent. The idea behind the present study is to design a nanocarrier that exploits the benefit of the antioxidant property of TQ without any toxicity. For this purpose, PAG (p-aminophenyl-1-thio-ß-d-galactopyranoside) coated NIPAAM (N-isopropyl acrylamide) nanoparticles are synthesized followed by encapsulation of TQ (NTQ) in their hydrophobic core. PAG is a ligand which directly interacts with asialoglycoprotein receptors (ASGP-R) present on the surface of hepatocytes and delivers the drug directly to the liver. NTQ have a size of ∼100 nm and were characterized using IR, NMR, DLS, and TEM. The drug was given in two modes: one as NTQ (3 groups: 0.125 (NTQL), 1.25 (NTQM) and 12.5 (NTQH) µg kg-1 body weight, intraperitoneal (i.p.)) and the other as TQ (12 500 µg kg-1 body weight, i.p.). The best results were obtained with NTQH which is around 1000 times lower than TQ in concentration. Serum and biochemical parameters followed by restoration of histopathology supported this. Expression of inflammatory enzyme COX-2 and NF-kB also gave evidence in support.

Self-assembled metalla-rectangles bearing azodipyridyl ligands: synthesis, characterization and antitumor activity.

Sixteen arene-Ru based molecular-rectangles were self-assembled in high yields by the equimolar mixing of arene-Ru acceptors (Aa-Ad) with various azopyridyl ligands (1,2-di(pyridyl-4yl)diazene (L1), 1,2-bis(pyridin-4-ylmethylene)hydrazine (L2), 1,2-bis(1-(pyridin-4-yl)ethylidene)hydrazine (L3), 1,2-bis(pyridin-4-ylmethylene)hydrazine (L4)) in nitromethane-methanol solutions. These new molecular-rectangles were fully characterized by a host of analytical techniques including elemental analysis, (1)H and (13)C NMR and HR-ESI-MS. The solid-state structures of two molecular-rectangles (1b and 4d) were determined by single crystal X-ray diffraction data. UV-visible and fluorescence studies were also carried out for the entire suite of rectangles. As with recent studies of similar arene-Ru complexes, the anti-proliferative activities of these complexes were evaluated against SK-hep-1 (liver cancer) and A-549 (lung cancer) human cancer lines. Additionally, the cellular pharmacology and intracellular localizations in AGS (gastric cancer) human cancer cells were determined for selected complexes (1c, 1d and 4c) by apoptosis and fluorescence microscopy studies. These studies confirm that arene-Ru molecular-rectangles inhibit cell cycle progression to the G0 phase, in contrast to that of cisplatin which arrests cell growth in the G2 phase.

Acute and sub-acute toxicity studies of Passiflora nepalensis in rats

This study was designed to elucidate the toxicity of widely used plant Passiflora nepalensis Walp. (Passifloraceae) in rats. We have taken methanolic extract isolated from whole plant of Passiflora nepalensis and studied their toxic effects. Acute, sub-acute toxicities and LD50 values were determined in experimental rats. The external appearance of the dead animals, the appearance of the viscera, heart, lungs, stomach, intestine, liver, kidney, spleen and brain were carefully noted and any apparent and significant features or differences from the normal were recorded after acute treatment with methanolic extract of whole plant of Passiflora nepalensis (MPN). Following the sub-acute administration of MPN for fourteen days, the vital organ such as liver, kidney and heart were carefully evaluated by histopathological and biochemical studies and any apparent and significant changes or differences from the normal were recorded. Pathologically, neither gross abnormalities nor histopathological changes were observed. Oral administration of MPN at the doses of 40, 80, 160 and 320 mg/kg body wt for fourteen consecutive days to male and female rats did not induce any short term toxicity. Collectively, these data demonstrate that the methanolic extract of Passiflora nepalensis have a high margin of safety.

Di-n-butyltin(IV) complexes derived from heterocyclic beta-diketones and N-phthaloyl amino acids: preparation, biological evaluation, structural elucidation based upon spectral [IR, NMR (1H, 13C, 19F and 119Sn)] studies.

Stable, six coordinated Bu(2)SnLA type complexes have been prepared [where LH = RCOC:C(OH)N(C(6) H(5))N:CCH(3); R = -4-F-C(6)H(4)-(L(1)H), R = -4-Cl-C(6)H(4)-(L(2)H), R= -4-Br-C(6)H(4)-(L(3)H), R=-CF(3)(L(4)H) and AH = C(O)C(6) H(4) C(O)NCHR'COOH; R'= -H(A(1)H), -CH(3)(A(2)H), -CH(CH(3))(2)(A(3)H)] by the interaction of 1:1:1 molar ratios of di-n-butyltin(IV) dichloride with corresponding organic moieties in refluxing benzene using two moles of Et(3)N as a base. In these complexes LH and AH behave as bidentate and coordination is taking place through oxygen, this is inferred from IR and (13)C NMR studies. These complexes possess tin atoms in skew trapezoidal bipyramidal geometry with the C-Sn-C angles ranging from 149.88( degrees ) to 156.84( degrees ). Some of these complexes with their corresponding organic moieties (LH, AH) were tested for their antimicrobial activities.