| 1 |
What is hybrid micellar liquid chromatography primarily used for in the study?
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To detect commonly used pesticides in vegetables. |
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The article developed a method of using hybrid micellar liquid chromatography. to detect pesticides in green leafy vegetables. This method is efficient and also environmentally friendly. |
Abstract: “...a procedure based on hybrid micellar liquid chromatography coupled to a photodiode array detector has been developed and validated to monitor imidacloprid, chlorpyrifos, profenofos and cypermethrin content in green leafy vegetables.”
1. Introduction: “...a hybrid HMLC-PDA method was developed and validated for simultaneous separation and detection of ICP, CPS, PFF and CP in green leafy vegetables...” |
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| 2 |
Which pesticide was found most commonly in the vegetable samples?
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Chlorpyrifos |
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The article stated that Chlorpyrifos was detected in the highest percentage of green leafy vegetable samples compared to other pesticides. |
Abstract: "Chlorpyrifos was found to be the most commonly used pesticide among vegetable growers. It was found in seventy-six percent samples..."
3.4 Evaluation of pesticide residue in green leafy vegetable: "In the chromatographic analysis CPS was found to be the most commonly used pesticide by vegetable growers of Sagar city and it was found in seventy-six percent of samples." |
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| 3 |
What percentage of the vegetable samples tested were found to contain no detectable pesticides?
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16% |
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The article states that sixteen percent of the collected green leafy vegetable samples were found to be negative for the selected pesticides. |
Abstract: "Sixteen percent of the collected samples were found to be negative for the selected pesticides."
3.4 Evaluation of pesticide residue in green leafy vegetable: "...sixteen percent of samples showed no pesticides (Fig. 4)." |
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| 4 |
Which of the following is NOT a reason for the use of hybrid micellar liquid chromatography (HMLC)?
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It requires extensive solvent use. |
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The article stated that hybrid micellar liquid chromatography (HMLC) is a green analytical method that uses low amounts of toxic solvents, reduces waste, is easy to handle, and provides rapid results. Therefore, extensive solvent use is not a characteristic of HMLC. |
Abstract: "The developed procedure is rapid, easy to handle, green since it uses a low amount of toxic chemicals..."
1. Introduction: "...HMLC can be considered a green analytical method according to the indications given by National Environmental Method Index (NEMI), Green Analytical Procedure Index (GAPI) and Analytical Eco-Scale... This saves time and money consumed in the stepwise extraction process for sample pre-treatment and reduces environmental pollution caused by bulk organic solvents in conventional chromatographic methods." |
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| 5 |
What was the primary methodological change in the HMLC technique used in the study?
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Use of a micellar mobile phase with reduced solvent usage. |
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The article explained that HMLC uses a modified aqueous micellar mobile phase containing surfactants and a small amount of short-chain alcohols, which helps reduce the use of organic solvents and allows direct injection of filtered samples. This reduces solvent consumption and environmental impact. |
1. Introduction: "HMLC is a modified version of the high-performance liquid chromatographic (HPLC) technique, where the composition of the mobile phase is a modified aqueous micellar mobile phase with a major part of water, surfactant (above critical micellar concentration) and low concentration of short-chain alcohols... This saves time and money consumed in the stepwise extraction process for sample pre-treatment and reduces environmental pollution caused by bulk organic solvents in conventional chromatographic methods." |
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| 6 |
According to the study, why might vegetable growers prefer other pesticides over Imidacloprid (ICP)?
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ICP is less effective on pests. |
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The article states that although ICP is less toxic and safer, vegetable growers do not prefer it because it requires a larger quantity to be effective compared to other pesticides. Furthermore, it is more expensive relative to traditional pesticides. |
3.1 Pesticide dealer survey: "In addition to the concentration of ICP (w/v), the percentage mentioned on the packing was lower than that of OPs and therefore, the required quantity of ICP was greater than OPs to kill the pest. For these reasons, ICP was not the preferred pesticide by vegetable growers." |
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| 7 |
What is the major benefit of using ICP as a pesticide, according to the study?
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It is less toxic compared to many others. |
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The article stated that imidacloprid (ICP) has a toxicity that is 700 times lower than nicotine and is considered a safer alternative to traditional pesticides. |
1. Introduction: "In recent years imidacloprid (ICP)... has a toxicity 700 folds lower than nicotine... Therefore ICP can be considered a good alternative for those pesticides which cause toxicity."
4. Conclusion: "The developed method confirmed the use of the highly toxic CPS pesticide... compared to the ICP pesticide considered with very low toxicity..." |
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| 8 |
What aspect of the pesticide detection method was focused on during the method validation phase?
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Ensuring it can detect extremely low pesticide levels. |
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The article stated that the method validation focused on sensitivity by determining limits of detection (LOD) and quantification (LOQ), precision, accuracy, and robustness to ensure reliable detection of low pesticide concentrations in vegetables. |
3.3.2 Method validation: "The method was validated following the guidelines of the SANTE/11,312/2021 including limits of detection and quantification, precision, and trueness... Limits of detection (LOD) and quantification (LOQ) for all the compounds were calculated... The compounds have LODs and LOQs in the range of 0.04 - 0.12 mg/Kg and 0.09 - 0.25 mg/Kg, respectively." |
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| 9 |
Considering the environmental impacts discussed, why is the HMLC method considered 'green'?
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It involves less waste and uses low-toxicity solvents. |
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The article stated that the HMLC method reduces environmental pollution by using low-toxic solvents and minimizing solvent waste, making it a green analytical approach. |
1. Introduction: "This saves time and money consumed in the stepwise extraction process for sample pre-treatment and reduces environmental pollution caused by bulk organic solvents in conventional chromatographic methods... HMLC can be considered a green analytical method... which used low toxicity solvents and waste in post-analysis is also reduced."
4. Conclusions: "These green methods used low toxicity solvents and waste in post-analysis is reduced. These factors are very important for environmental conditions." |
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| 10 |
What is the importance of the photodiode array detector in the HMLC technique used in the study?
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It detects the presence of pesticides across a spectrum of wavelengths. |
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The article explained that the photodiode array detector (PDA) allows simultaneous detection of multiple pesticides by measuring absorbance at different wavelengths, improving identification and quantification accuracy. |
2.5 Chromatographic conditions instruments and software processing:
"The HMLC system used ... having ... a photodiode array detector (SPD-M20A, 190–800 nm)... The maximum absorbance for ICP was 270 nm, for CPS was 266 nm, PFF was 253 nm and CP was 244 nm." |
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| 11 |
What is hyperthermia commonly used to treat?
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Cancer |
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The article explained that hyperthermia heats the body to kill cancer cells while causing little harm to normal cells. It is used to treat many types of cancer, often combined with radiotherapy or chemotherapy. |
Abstract: "The elevated body temperature can damage the cancerous cells with minimum injury to the normal cells... Successful therapy method in combination with radiation therapy and/or chemotherapy is provided to the cancer patient..."
Introduction: "Research has shown that elevated body temperature can damage and kill cancerous cells with minimal injury to normal cells... Hyperthermia is widely applicable with different other forms of cancer therapy... The aim of the study was to treat many types of cancer including brain, liver, sarcoma, lung, esophagus, breast, bladder, rectum and peritoneal lining." |
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| 12 |
Which method is used to apply heat directly to a tumor in local hyperthermia?
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Microwaves |
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The article stated that local hyperthermia uses techniques like microwaves, ultrasound, and radiofrequency to apply heat directly to tumors. Microwaves are specifically mentioned as a method for heating superficial tumors by placing applicators on the surface. |
Introduction: "Different techniques were used to incorporate heat like as microwave, ultrasound and radiofrequency."
Local Hyperthermia section: "By means of antennas or applicator emitting microwaves or radiowaves, superficial tumors can be heated, when placed on their surface with a contacting medium." |
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| 13 |
What is the primary benefit of using hyperthermia in cancer treatment?
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It kills cancer cells with minimal damage to normal cells. |
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The article clearly stated that hyperthermia works by raising body temperature to damage or kill cancer cells while causing little harm to normal tissues. |
Abstract: "The elevated body temperature can damage the cancerous cells with minimum injury to the normal cells."
Introduction: "Research has shown that elevated body temperature can damage and kill cancerous cells with minimal injury to normal cells." |
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| 14 |
Hyperthermia is often used in combination with which of the following treatments?
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Radiotherapy and chemotherapy |
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The article stated that hyperthermia is often used together with radiotherapy and/or chemotherapy to improve treatment effectiveness for cancer patients. |
Abstract: "Successful therapy method in combination with radiation therapy and/or chemotherapy is provided to the cancer patient..."
Introduction: "Hyperthermia is widely applicable with different other forms of cancer therapy, including radiation therapy and chemotherapy..."
Conclusion: "Hyperthermia in addition to radiotherapy with or without chemotherapy is important when it is necessary to treat advanced or high-risk tumors..." |
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| 15 |
What is the main challenge of using hyperthermia in cancer treatment?
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Reaching and maintaining the required temperature in the target area. |
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The article highlighted that one major challenge of hyperthermia is achieving and maintaining a temperature of around 42 °C in specific tumor regions, as this requires a precise power density and is affected by factors like perfusion. |
Introduction: "Attaining temperature above the systemic temperature 37 °C in a specified target volume is a challenge and still under development... tumors require a power density of approx 20–40 W/kg at the target region." |
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| 16 |
Which type of hyperthermia involves heating a larger region or the whole body?
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Whole-body hyperthermia |
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The article explained that whole-body hyperthermia is used to treat metastatic tumors and involves heating the entire body to a steady 42 °C for one hour, unlike local or regional hyperthermia, which targets specific areas. |
Whole Body Hyperthermia section: "Whole body hyperthermia is applied to treat metastatic tumor that has spread throughout the body. A steady state of 42 °C is maintained for 1 h..." |
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| 17 |
What type of hyperthermia uses applicators inserted into or near a body cavity to deliver heat?
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Endocavitary hyperthermia |
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The article describes endocavitary hyperthermia as a method where applicators are inserted into or near body cavities—such as the esophagus, rectum, cervix, or vagina—to deliver heat directly to tumors. |
Interstitial and Endocavitary Hyperthermia section:"Endocavitary antennas were inserted in openings of hollow organs such as the urethra (prostate), rectum (rectal cancer, prostate), esophagus, cervix and vagina..."
Local Hyperthermia section:"Intraluminal or endocavitary: Used to treat the tumors within the body or near body cavities, like as esophagus or rectum." |
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| 18 |
What is a significant potential side effect of whole-body hyperthermia?
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Systemic stress affecting major organs |
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The article stated that whole-body hyperthermia can cause systemic stress, which may lead to adverse effects on the heart, blood vessels, and other major organs, especially in combination with anesthesia. |
Whole Body Hyperthermia section:
-"An entirely different range of toxic effects arises from the systemic stress..."
Side Effects of Regional and Whole-body Hyperthermia:
-"In severe cases (rarely) it leads to problems associated with heart, blood vessels, and other major organs." |
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| 19 |
Considering the physics of heat transfer, why is controlling hyperthermia challenging during treatment?
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Human tissue has varying thermal conductivities which affect heat distribution. |
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The article explaind that thermal distribution is difficult to predict and control because human tissues vary in their thermal properties, which impacts how heat spreads during hyperthermia treatment. |
Treatment Planning and Simulation section:
"The problem associated with these thermal method generation of vessel network requires... poorly — predictable, variation in thermal properties of tissues."
This variation complicates achieving uniform and controlled heating in the target area. |
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| 20 |
Why is hyperthermia considered a beneficial adjunct to radiotherapy and chemotherapy?
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It makes cancer cells more susceptible to other treatments. |
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The article explained that hyperthermia increases the sensitivity of tumor cells to both radiation and chemotherapy. It enhances oxygenation and perfusion in tumors, improves drug absorption, and interferes with DNA repair in cancer cells, thereby making other treatments more effective. |
Hyperthermia in Association With Radiotherapy: “Radiotherapy and hyperthermia are complementary in their action… hyperthermia inhibits [DNA] reparation.”
Hyperthermia in Association With Chemotherapy: “Hyperthermia, with enhanced tissue perfusion, facilitates the absorption of chemotherapeutic API… chemotherapy becomes more effective, and less toxic.” |
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