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Validasi Metode Rp-Hplc Untuk Penentuan Kadar Andrografolid Sebagai Senyawa Penanda Pada Campuran Esktrak, Anisyah Is Purwati, Prasetyawan Yunianto, Agus Supriyono

Chimica et Natura Acta

Andrografolid merupakan senyawa bioaktif dari tanaman sambiloto (Andrographis paniculata) yang berpotensi sebagai bahan obat. Kadar andrografolid dapat ditentukan menggunakan RP-HPLC. Penelitian ini bertujuan mengembangkan dan memvalidasi metode RP-HPLC untuk menentukan kadar andrografolid sebagai senyawa penanda untuk standarisasi formula obat herbal terstandar (OHT) dari campuran ekstrak tanaman sambiloto dan binahong (Andredera cordifolia). Metode RP-HPLC dikembangkan menggunakan kolom Sunfire C18 (150 × 4,6 mm, 5μm) dengan fase gerak asetonitril dan campuran 0,1% asam trifloroasetat dan metanol (90:10) secara elusi gradien serta laju alir fase gerak 1 mL/menit. Deteksi menggunakan detektor PDA pada panjang gelombang 230 nm. Andrografolid dielusi pada waktu retensi 9,77 …

Penyimpanan Haloalkana Dehalogenase: Pengaruh Konsentrasi Terhadap Stabilitas Dan Aktivitas Enzim, Khomaini Hasan

Chimica et Natura Acta

Karena kebutuhan penyimpanan protein rekombinan dalam waktu yang sangat lama, berbagai macam kondisi penyimpanan telah disarankan dalam berbagai publikasi guna mempertahankan integritas struktur dan/atau aktivitas enzim asalnya. Tujuan dari penelitian ini adalah untuk mempelajari pengaruh konsentrasi protein terhadap kestabilan penyimpanan dari haloalkana dehalogenase murni. Haloalkana dehalogenase rekombinan dimurnikan dengan dua langkah pemurnian, yaitu kromatografi penukar ion  dan afinitas. Dua kondisi konsentrasi enzim diobservasi selama 4 minggu. Aktivitas enzim diuji tiap minggu yang merefleksikan kestabilan dari enzim. Hasil menunjukkan bahwa konsentrasi enzim 0.5 mg/mL, dibandingkan dengan konsentrasi 2 mg/mL, lebih mudah mengalami inaktifasi dan kehilangan aktivitas. Peningkatan aktivitas dan stabilitas enzim …

Alga Merah (Gracilaria Coronopifolia) Sebagai Sumber Fitohormon Sitokinin Yang Potensial, Saadah Diana Rachman, Zakiyah Mukhtari, R. Ukun M.S. Soedjanaatmadja

Chimica et Natura Acta

Alga  merah (Gracilaria coronopifolia) merupakan tanaman tingkat rendah berupa thallus yang tidak memiliki daun, akar dan batang sejati serta sebagian besar tumbuh pada batu di terumbu karang. Alga merah selain mengandung beberapa senyawa organik seperti polisakarida, vitamin, dan berbagai senyawa bioaktif, juga merupakan tanaman yang mengandung fitohormon sitokinin yang cukup potensial dan bermanfaat untuk pembuatan pupuk hormon/biostimulan. Penelitian ini bertujuan untuk mengisolasi dan mengidentifikasi sitokinin dari alga merah G. coronopifolia, serta mengetahui pengaruhnya terhadap pertumbuhan tanaman padi (Oryza sativa). Isolasi dan identifikasi sitokinin dimulai dengan proses maserasi menggunakan metanol 80%, ekstraksi dengan etil asetat, kromatografi adsorpsi, kromatografi lapis tipis preparatif, …

Penggunaan Air Olahan Limbah Kantin Hasil Perendaman Batang Pisang Dan Ampas Teh Untuk Pertumbuhan Tanaman Mangkokan Dan Puring, Serta Peningkatan Mutu Air Olahan Dengan Elektrokimia Termediasi, Christi L. Natanael, Yati B. Yuliyati

Chimica et Natura Acta

Pertumbuhan tanaman mangkokan dan puring dalam media air olahan limbah salah satu kantin di lingkungan kampus Jatinangor menunjukkan hasil yang lebih baik bila dibandingkan dalam media air limbah kantin yang tanpa diolah terlebih dulu. Hal ini dapat dilihat dari tumbuhnya akar dan pucuk daun baru.Pengolahan pendahuluan dilakukan dengan memasukkan irisan batang pisang dalam air limbah kantin selama 2 jam. Perlakuan ini berhasil menurunkan jumlah total koloni bakteri yaitu sebesar 57,13%. Selanjutnya dilakukan bioadsorpsi menggunakan ampas teh (10 g/L), proses ini menyebabkan perubahan nilai pH air limbah menuju pH normal. Pada 2 jam bioadsorpsi nilai pH air olahan 5,42; konduktivitas 713 …

No More Baby Steps: Preventing Unintended Pregnancies Of Los Angles Minorities And Adolescents, Rachel Bass

Master's Projects and Capstones

Previous studies have identified pregnancy intention to correlate with both maternal and fetal health. Though unintended pregnancy rates are dropping in America, they remain high among minority and young women. Contraceptive usage, a leading protective factor for unintended pregnancies, has been found to vary greatly by age and ethnicity. These two projects aimed to decrease unintended pregnancy rates through increasing patient knowledge of contraceptive options and correct usage. The first project focused on creating a comprehensive, oral contraceptive pill instructional handout for research participants of the birth control pill study. This handout was created through the analysis of compliance errors …

Remediation Strategies For Mercury Contaminated Lakes And Reservoirs Within The State Of California, Emily Chortek

Master's Projects and Capstones

Mercury is an environmental and public health concern due to its neurodegenerative effects and ubiquitous concentration within the environment. To mitigate these risks and reduce concentrations within the environment, remediation methods are necessary. The purpose of this paper is to investigate and evaluate the efficacy of a number of remediation options for mercury contaminated lakes and reservoirs in the State of California. This paper also identifies a number of challenges associated with the implementation of each method and provides recommendations for environmental managers to use when remediating mercury contaminated lakes. Hypolimnetic oxygenation (HOS) was found to be the least problematic …

Control Freak: How An Injured Esports Athlete Got Back Into The Game, Imad Khan

Capstones

This capstone profiles Aziz "Hax" Al-Yami, a professional Super Smash Bros. Melee player. Melee is a video game and Al-Yami is an esports competitor, i.e. a professional gamer. In this world, gamers compete as athletes, pushing their skills to their absolute limit to become the best in the world. Al-Yami, at 21, suffered from a wrist injury. This injury put him out of the game for over a year. His injury was so bad that doctor's told him that he could never compete again. But through his own research, Al-Yami surmised that if he were to get his FCU tendon …

When Grade Schools Stage Musicals, It’S Broadway Or Bust ..., Erin Degregorio

Capstones

St. Ephrem School, located in Dyker Heights, Brooklyn, just introduced its drama program in Fall 2016. After much success with last year’s first-ever production of Disney’s “Aladdin JR.," the St. Ephrem students put on “Elf the Musical JR.” in time for the winter holiday season in December 2017. But it’s not your mediocre school drama club, putting on simple pageants. It’s more like Broadway Lite – and it’s part of a cross-country wave of professionalization hitting grade-school plays.

Project can be found at http://erindegregorio.com/grade-school-productions.html

Road Dust Correlated With Decreased Reproduction Of The Endangered Utah Shrub Hesperidanthus Suffrutescens, Matthew B. Lewis, Eugene W. Schupp, Thomas A. Monaco

Western North American Naturalist

Roads associated with energy development have fragmented much of the Uinta Basin, the Colorado Plateau in general, and other areas of western North America. Beyond reducing available habitat, spreading exotic species, and creating barriers to dispersal, unpaved roads also increase dust loads on plants and pollinators, which may reduce plant growth and reproduction. We studied the effects of an unpaved road on reproduction of an endangered Utah endemic shrub. We measured the size and reproductive output of 156 plants and the dust deposition in plots at increasing distances from the road. We also hand outcrossed 240 flowers from 80 plants …

Traditional Ecological Knowledge In Collaborative Forest Restoration In The Sierra Nevada, Michael Boero

Master's Theses

Forest restoration in the Sierra Nevada is receiving increased attention due to climate change, increasing populations in the wildland-urban interface, and the historical mismanagement of some forests, evidenced in part by the increasing frequency and severity of wildfires in recent years. In response to an urgency to implement restoration in the absence of consensus on the best ways to proceed, public land managers practice collaborative management approaches to ameliorate antagonism between stakeholders and allow restoration projects to proceed when agreement is difficult to achieve. Stakeholders often include representatives from local community groups, environmental organizations, private industry, and—notably—tribal groups, who hold …

A Full Factorial Analysis Of Polymerization Conditions Of Sodium Alginate Beads To Determine The Effect On Diffusivity And Concentration Limit Of Tryptophan And Glucose, Allison Schulkins

Master's Theses

The purpose of this work is to develop an experimental setup with associated mathematical analysis to analyze the changes in diffusivity through calcium alginate gel beads made under different polymerization conditions. The diffusivity of the solutes glucose and tryptophan was calculated by measuring the concentration change over time as solute diffused out of the alginate spheres and into the bulk. The alginate beads were generated using different polymerization conditions following a two-level, three-factor, full-factorial matrix with alginate concentration, cross-linker concentration, and cross-linking time as the factors. The diffusivities showed variations between different conditions, which were analyzed to determine the main …

Developmental Effects Of Nicotine Exposure In Drosophila Melanogaster, Lisa Janet Wong

Master's Theses

Approximately 12%-20% of pregnant women smoke at some point during pregnancy, and 10% of pregnant women are reported to have smoked during the last 3 months of pregnancy. Smoking during pregnancy leads to developmental health risks for the fetus and child, including increased mortality, low birth weight, and developmental delays. The direct molecular targets of nicotine are nicotinic acetylcholine receptors (nAChRs) due to the similarities in structure between nicotine and acetylcholine. However, in many cases, it remains unclear what molecular events downstream of nAChRs lead to the deleterious effects of nicotine on development. We have established Drosophila melanogaster as a …

Preparation And Characterization Of A (Viologen) Containing Main Chain Peg-Carbon Nanotubes Phase For Hybrid Supercapacitor Application, Kanishka Rana

Master's Theses

Supercapacitors (SCs) and batteries are recognized as the two most important electrical energy storage devices. SCs have some distinct advantages such as high-power density and long cycle life when compared to batteries. However, they have yet to match the energy densities of batteries. In an effort to improve the energy density of SCs, a hybrid supercapacitor was developed using a pair of single-walled carbon nanotube electrodes and two polyethylene glycol (PEG-400) gel-polymer electrolytes (GPEs) containing redox additives of viologen (V) and ferrocene dicarboxylic acid (Fc), respectively. The introduction of V and Fc, was expected to improve the energy performance of …

Latino Male College Students' Identities, Psychological Stress, And Coping Mechanisms, Ana E. Ramirez

Dissertations

Latino male college students’ identities impact their personal experiences, academic achievement, and well-being. This qualitative study uses a narrative inquiry approach to research Latino male college students’ racial and ethnic, gender, and academic identities and to investigate how these identities impact their psychological stress and the coping mechanisms they implement to manage their stress. Latino males undergo an identity development in which they engage in negotiating their gender identities in order to prioritize higher education academic requirements. When Latino males are determined to achieve a college degree, they are able to adjust their familism gender role expectations and shift their …

Jackie Kay, Trumpet (1998), Marie Hologa

Studies in Scottish Literature

Argues that Kay's acclaimed novel about a celebrated black jazz trumpeter, who is transgender, presents "an alternative construction of masculinity to the stereotypical Scottish 'hard man' of tartan noir, " dealing with "questions of identity that go beyond Scottishness," and unmasking "the emptiness of normative categories like gender, sexuality, ‘race’ and ethnic origins in a postmodern ... society."

Defining The Role Of Neuropilin-2 In Macrophages: Implications In Tumor Associated Macrophages In Pancreatic Cancer, Sohini Roy

Theses & Dissertations

Macrophages are extremely heterogeneous and highly plastic hematopoietic cells that reside in all tissues and act as a bridge between the innate and adaptive arms of the immune responses. Besides, they undertake a wide array of housekeeping functions like, clearance of cellular debris that arise due to regular turnover in tissues, iron homeostasis, immune surveillance as well as tissue repair processes post inflammation. They are also causally associated with several clinical conditions, including cancer where the infiltration of macrophages contribute to disease progression, metastasis and therapy resistance, and thereby poor clinical outcome.

Neuropilins (NRPs) are non-tyrosine kinase cell surface glycoproteins …

Role Of Ezrin In Colorectal Cancer Cell Survival Regulation, Premila Leiphrakpam

Theses & Dissertations

Colorectal cancer (CRC) is the second most common cause of cancer related deaths in the United States, mainly due to metastasis to the distant organ sites. However, the molecular basis of CRC metastasis is poorly understood. Therefore, identification and characterization of novel potential anti-cancer therapeutic targets CRC is of urgent need. Utilizing a 2D-DIGE proteomics approach ezrin was identified as a protein that is differentially expressed between primary colon tumors xenografts, orthotopically implanted in athymic nude mice, and corresponding and liver metastatic deposits. Ezrin, a cytoskeletal protein belonging to the ezrin–radixin–moesin (ERM) family plays important roles in cell motility, invasion …

Metabolic Reprogramming Of Pancreatic Ductal Adenocarcinoma Cells In Response To Chronic Low Ph Stress, Jaime Abrego

Theses & Dissertations

Pancreatic ductal adenocarcinoma (PDAC) is among the most lethal of all cancers with a 5-year survival rate of only 8.2%. This is because PDAC is diagnosed in its advanced stages and is characterized by radio and chemotherapy resistance. Aggressiveness of PDAC tumors is attributed to its high metabolic phenotype, which is characterized by increased glycolysis rate and lactate secretion, while oxidative metabolism is reduced. These metabolic features are required to fulfill the biosynthetic demands of proliferating PDAC cells. However, this increase in metabolic activity results in acidification of the extracellular space because the dense fibrotic stroma of PDAC tumors limits …

Focus: A Graph Approach For Data-Mining And Domain-Specific Assembly Of Next Generation Sequencing Data, Julia Sommer

Theses & Dissertations

Next Generation Sequencing (NGS) has emerged as a key technology leading to revolutionary breakthroughs in numerous biomedical research areas. These technologies produce millions to billions of short DNA reads that represent a small fraction of the original target DNA sequence. These short reads contain little information individually but are produced at a high coverage of the original sequence such that many reads overlap. Overlap relationships allow for the reads to be linearly ordered and merged by computational programs called assemblers into long stretches of contiguous sequence called contigs that can be used for research applications. Although the assembly of the …

Self-Efficacy For Symptom Management In Adult Hematopoietic Stem Cell Transplant Patients, Lynn White

Theses & Dissertations

Hematopoietic stem cell transplant (HSCT) is a treatment for hematologic cancers and other hematologic conditions that causes severe treatment-related symptoms. The first 30 days after HSCT, or the acute phase, is when symptoms are most intense. During this time, the ability of patients to manage their symptoms, in collaboration with their health care providers, is crucial to reduce the distress caused by the symptoms. Self-efficacy is the person’s confidence in their ability to perform a behavior, such as symptom management. This body of work describes the concept of self-efficacy for symptom management (SESM), presents an integrated literature review on self-efficacy …

Novel Therapeutic Strategies For Treatment Of Castration-Resistant Prostate Cancer, Matthew A. Ingersoll

Theses & Dissertations

Prostate cancer (PCa) remains the most commonly diagnosed solid tumor and is the third leading cause of cancer-related death in United States men. While androgen deprivation therapy is the current standard-of-care treatment for metastatic PCa, most patients eventually relapse and develop castration-resistant (CR) tumors, for which there is currently no effective treatment. Therefore, synthesis of novel therapeutic agents and identification of alternative target proteins are necessary to improve treatment. Herein, I investigate the efficacy of novel imidazopyridine and statin derivatives as alternative therapeutic compounds. These molecules not only inhibit androgen receptor signaling, but also block activation of the AKT axis, …

Spotlight On Superfund: How Are New York’S Most Toxic Waste Sites Doing Under Trump’S E.P.A?, Sarah Stein Kerr

Capstones

No matter where you venture in New York City, you are never far from toxic pollution. And if you are in Brooklyn or Queens, you may be a stone’s throw from a federal Superfund, our nation’s most polluted sites.

For New York City’s Superfunds– Newtown Creek, the Gowanus Canal and the Wolff-Alport Chemical Company in Ridgewood, Queens – change is underfoot.

In February, President Donald J. Trump appointed former Oklahoma Attorney General Scott Pruitt to head the Environmental Protection Agency.

Pruitt, who made a career for himself suing and attacking the E.P.A, has already instituted sweeping changes as part of …

Comparison Of The Bi-Directional Performance Of Micro-Channel Sieve And Thin-Film Time Peripheral Nerve Interfaces, Robert Coker

McKelvey School of Engineering Graduate Student Theses & Dissertations

Sophisticated motorized prosthetic limbs contain multiple degrees of freedom of motion as well as embedded pressure and angle transducers to provide sensory feedback in amputees. Although several central neural recording and stimulation modalities exist for both controlling these motions and providing sensory feedback from a prosthetic limb, directly interfacing the peripheral nerves which originally innervated the limb has many advantages. A difficulty with this bi-directional approach is that electrically stimulating axons to provide haptic feedback creates stimulation artifacts at neighboring recording sites within the nerve that are several orders of magnitude larger than the electroneurogram used for control. In this …

Coupling Of Oxidation-Reduction Reactions Of Chromium, Iron And Manganese: Implications For The Fate And Mobility Of Chromium In Aquatic Environments, Chao Pan

McKelvey School of Engineering Graduate Student Theses & Dissertations

Both within the United States and internationally, hexavalent chromium (Cr(VI)) is a contaminant of concern in drinking water supplies. The U.S. Environmental Protection Agency is considering a Cr(VI)-specific standard. Thus improved technologies for Cr(VI) removal in drinking water are needed. Iron electrocoagulation for Cr(VI) removal was examined at conditions directly relevant to drinking water treatment, and humic acid (HA) affects the performance of electrocoagulation in multiple ways. The success of the chromium treatment or remediation also relies on the stability of the Cr(III)-containing solids with respect to reoxidation under groundwater conditions. Manganese is ubiquitous in aquatic and terrestrial environments, and …

Analysis Of Argonaute-Small Rna-Transcription Factor Circuits Controlling Leaf Development, John Steen Hoyer

Arts & Sciences Graduate Student Theses and Dissertations

Experimental studies of plant development have yielded many insights into gene regulation, revealing interactions between core transcriptional and post-transcriptional regulatory pathways present in all land plants. This work describes a direct connection between the three main small RNA-transcription factor circuits controlling leaf shape dynamics in the reference plant Arabidopsis thaliana. We used a high-throughput yeast 1-hybrid platform to identify factors directly binding the promoter of the highly specialized ARGONAUTE7 silencing factor. Two groups of developmentally significant microRNA-targeted transcription factors were the clearest hits from these screens, but transgenic complementation analysis indicated that their binding sites make only a small contribution …

A Generalized Biophysical Model Of Transcription Factor Binding Specificity And Its Application On High-Throughput Selex Data, Shuxiang Ruan

Arts & Sciences Graduate Student Theses and Dissertations

The interaction between transcription factors (TFs) and DNA plays an important role in gene expression regulation. In the past, experiments on protein–DNA interactions could only identify a handful of sequences that a TF binds with high affinities. In recent years, several high-throughput experimental techniques, such as high-throughput SELEX (HT-SELEX), protein-binding microarrays (PBMs) and ChIP-seq, have been developed to estimate the relative binding affinities of large numbers of DNA sequences both in vitro and in vivo. The large volume of data generated by these techniques proved to be a challenge and prompted the development of novel motif discovery algorithms. These algorithms …

Regulation Of Gene Expression By Rna Binding Proteins And Micrornas, Kyle Cottrell

Arts & Sciences Graduate Student Theses and Dissertations

Regulation of gene expression is essential to life. Post-transcriptional regulation of gene expression is a complex process with many inputs that lead to changes in localization, translation and stability of mRNAs. The translation and stability of many mRNAs is regulated by cis-elements, such as mRNA-structure or codon optimality; and by trans-acting factors such as RBPs and miRNAs. Here I report on the complex interactions between RBPs, miRNAs and characteristics of their target mRNAs in respect to effects on translation and RNA stability.Using a reporter based approach we studied modulation of microRNA-mediated repression by various mRNA characteristics. We observed the influence …

The Regulation Of Extracellular Amyloid-Β Levels By Ionotropic Glutamatergic Transmission In An Alzheimer’S Disease Mouse Model, Jane Cecelia Hettinger

Arts & Sciences Graduate Student Theses and Dissertations

Brain extracellular concentration of the peptide amyloid-β (Aβ) is a major contributor to Alzheimer’s disease (AD) pathogenesis. High Aβ levels in the extracellular space precipitate aggregation of the peptide into soluble and insoluble toxic species. This process begins decades before cognitive impairment and triggers the cascade of pathology that eventually leads to AD. Synaptic activity is key to the regulation of extracellular Aβ levels. Presynaptic activity drives the production of Aβ, while postsynaptic receptor activation exhibits more nuanced regulation. For example, high levels of NMDA receptor (NMDA-R) activation have been shown to decrease Aβ production through the extracellular signal-regulated kinase …

Longitudinal Cerebrospinal Fluid Biomarkers Of Alzheimer Disease: Movement Toward The Diagnosis, Prognosis And Staging Of Disease, Courtney Sutphen

Arts & Sciences Graduate Student Theses and Dissertations

Alzheimer’s disease (AD) is a devastating neurodegenerative disease that slowly claims the memories and experiences that comprise the life experiences of individuals that suffer from the disease. Despite a continually accelerating pace of research and discovery, a viable therapeutic intervention for AD has yet to be realized. There are a multitude of factors that may contribute to this difficulty including the challenge of separating the overall disease of Alzheimer’s from the clinically recognizable memory loss that occurs in what is now known to be the end-stage of the disease. Efforts to treat AD have increasingly turned toward very early disease …

Roles Of Peroxisomes And Peroxisome-Derived Products In Controlling Plant Growth And Stress Responses, Elizabeth May Frick

Arts & Sciences Graduate Student Theses and Dissertations

The peroxisome is a vital organelle conserved through the entire eukaryotic lineage. In all examined species, peroxisomes are responsible for such essential processes as fatty acid beta-oxidation and metabolism of reactive oxygen species (ROS). In plants, peroxisomes have taken on additional specialized roles, such as production of some plant hormones and vitamins. In this work, I have uncovered novel factors regulating peroxisome number in model species Arabidopsis thaliana, and novel mechanisms governing how peroxisomes respond to salt stress. I discovered a role for Arabidopsis MAP KINASE17 (MPK17) as a negative regulator of peroxisome division that acts in the salt-stress response …