What are the disadvantages of graphene?5 answersGraphene, despite its remarkable properties, faces several challenges. Firstly, defects in graphene hinder its performance in electronic and spintronic applications, limiting its use in nanoelectronics and spintronics. Secondly, the production of graphene from nonrenewable and toxic raw materials poses environmental and resource scarcity concerns, along with high production costs. In the biomedical field, graphene's accumulation in tissues can lead to toxic reactions and cell dysfunction, impacting immune function and potentially causing biotoxicity. Additionally, the fine structure of graphene presents challenges in designing graphene-based speakers for hearing aids, despite its advantages in enhancing sound pressure levels and reducing power consumption. These disadvantages highlight the need for further research to address these issues and unlock the full potential of graphene in various applications.
What are the advantages of chromatography and limitations?5 answersChromatography offers various advantages such as high-throughput miniaturized methods for cost-effective experimentation, precise analysis in bioanalysis with modern sample preparation techniques and selection of detection techniques, and the ability to purify sensitive molecules using functionalized adsorption materials in chromatography cartridges. However, limitations include challenges in environmental analysis due to low concentrations and sample interferences, necessitating high column efficiency and sensitive detection systems. Overcoming these limitations, recent advancements in online solid phase extraction coupled with liquid chromatography and tandem mass spectrometry offer advantages like low limits of quantification, minimal sample volume requirements, and simultaneous quantification of target products and their transformation products.
What are the advantages and disadvantages of a computer?4 answersThe advantages of using a computer include improved efficiency and reliability in various fields such as education and research. In auditing, computer-assisted audit techniques enhance the planning and preparation process, improve the accuracy of testing and detecting fraud, and allow for continuous monitoring of company databases. Computer technology also has a positive effect on second language learning, improving achievement levels of learners. In the field of surgery, computer-assisted surgery aids in preoperative planning and intraoperative assistance, leading to more precise surgical techniques and potentially improved clinical outcomes. On the other hand, there are disadvantages to using computers, such as high costs and complexity of implementation in auditing, financial limitations in second language learning, and the inability to factor in soft-tissue structures in computer-assisted surgery. It is important to recognize both the advantages and disadvantages of using computers to maximize their effectiveness in various domains.
What are the key factor of disadvantages?5 answersDisadvantages can be categorized into four key factors: social, economic, individual-level, and area-level factors. Individual-level measures of disadvantage tend to show stronger associations with child health compared to area-level measures. The choice of disadvantage indicators, whether individual- or area-level, can affect the inferences made about the relationship between disadvantage and child health. In terms of teaching disadvantage to medical students, it is important to go beyond financial disadvantage and consider other disadvantages such as social distress, safety, economic status, and educational levels. Welfare problems tend to cluster, with experiences of threat or violence and sleeping problems being the most common. Immigrant status and being single are individual characteristics that often contribute to the accumulation of welfare problems.
What are the advantages and disadvantageof implants?4 answersImplants have various advantages and disadvantages. Some advantages include the ability to adjust volume during surgery, easy rupture detection, lower cost, and a more natural look and feel. Immediate loading of implants after tooth extraction reduces soft and hard tissue loss, overall treatment time, and provides psychological satisfaction for the patient. Zirconia implants offer optimal osseointegration, biocompatibility, esthetic properties, and less susceptibility to bacterial adhesion and peri-implantitis. Interbody implants made of polyetheretherketone (PEEK) and titanium-coated PEEK have gained popularity in cervical spine surgery due to their successful bony fusion and implant fixation. Bioresorbable polymer implants offer advantages such as avoiding long-term interference with gliding structures, supporting bone healing, and eliminating the need for implant removal, while also reducing pain and complications. However, it is important to note that each type of implant has its own limitations and potential risks, and long-term studies are still needed to fully understand their outcomes.
What are the advantages and disadvantages of contact lenses?4 answersContact lenses have several advantages, including being a popular, convenient, and effective method for vision correction. They also offer unique advantages for ophthalmic drug delivery, such as extended wear and high bioavailability. However, there are also disadvantages associated with contact lens use. One disadvantage is the increased risk of infection, which has been consistently reported to be higher in contact lens wearers. Another disadvantage is the alteration of critical properties of contact lenses, such as water content, mechanical properties, ion permeability, transparency, and oxygen permeability, which can limit their commercialization for therapeutic purposes. Additionally, soft toric contact lenses, while providing quick adaptation and comfort, may have variable visual acuity due to lens rotation. Therefore, while contact lenses offer advantages for vision correction and drug delivery, they also come with risks and limitations that need to be considered.