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Floods in polluted rivers can pollute groundwater too: Study

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Floods in polluted rivers can pollute groundwater too: Study

[vc_row][vc_column][vc_column_text]File photo of the floods that submerged large parts of Chennai in December 2015. Photo credit: PTI

~By Bhavya Khullar

Scientists from Anna University studied groundwater samples taken before and after Chennai floods of December 2015 to probe effect of floods on water quality

New Delhi: A new study has pointed out that flooding in polluted rivers has the potential to make groundwater unsafe for human use.

In December of 2015, when Chennai was flooded and people were marooned, a team of scientists from Anna University was collecting groundwater samples along the Adyar river to investigate if the groundwater in this region was fit for human consumption.

Researchers collected water samples from 17 locations in December 2015 and April 2016, that is, during and after floods. They tested the samples for salt and heavy metal concentration, microbial load and their susceptibility to available antibiotics.

“We wanted to know if the city water met water quality parameters laid down by the Bureau of Indian Standards during and post-flood”, Lakshmanan Elango, professor at the Department of Geology of Anna University, who led this study, told India Science Wire.

The results showed that heavy metal and microbial load in groundwater samples was high. The samples contained microbes such as Enterobacter, Staphylococcus, Escherichia, Streptococcus, Vibrio, and Salmonella that are known to cause infections like dysentery, cholera, and typhoid in humans. These microbes were cultured with various antibiotics used in clinical practice to treat life-threatening infections, to know they were susceptible or resistant to drugs.

“The bacteria were sensitive to most antibiotics but some were resistant to nalidixic acid, which is alarming as antibiotic resistance can rapidly spread in the environment”, said Prof Elango. The results of the study have been published in journal Nature Scientific Data.

In addition, scientists found high genetic similarity between bacteria from various locations implying that they must have originated from a single domestic sewage source containing fecal matter. “Sewage must have washed off with flood water, which in turn inundates the wells that would have resulted in contaminating the ground water”, believes Prof Elango.

“Our findings show that floods have the potential to impact the microbial quality of ground water in affected areas. Based on our study, we advise that wells must be chlorinated and the public must be warned to avoid consuming ground water for drinking, at least for some months post floods”, he added.

The research team included Ganesan Gowrishankar, Ramachandran Chelliah, Sudha Rani Ramakrishnan, Vetrimurugan Elumalai, Saravanan Dhanamadhavan, Kartikeyan Brindha, Usha Antony, and Lakshmanan Elango. It was done in collaboration with the University of Zululand in South Africa and the National University of Singapore, and was funded by the Department of Science and Technology (DST).

(This article has not been edited by the APNLive staff. It is from an auto-generated syndicated feed provided by the India Science Wire)[/vc_column_text][/vc_column][/vc_row]

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MK Stalin predicts frequent PM Modi visits to Tamil Nadu before assembly election

MK Stalin has said Prime Minister Narendra Modi will visit Tamil Nadu more often ahead of the Assembly election, calling the tours politically motivated and questioning the Centre’s support to the state.

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MK Stalin

Tamil Nadu Chief Minister M. K. Stalin has predicted that Prime Minister Narendra Modi will increase his visits to the state as the Assembly election, expected in April or May, draws closer.

Speaking ahead of the polls, the DMK president said the Prime Minister has already begun touring Tamil Nadu and is likely to visit frequently in the coming months. He claimed that such visits could create discomfort within the BJP-led National Democratic Alliance (NDA), as alliance partners may fear the political impact of repeated appearances.

Stalin calls visit politically motivated

The Chief Minister described the Prime Minister’s scheduled programmes in the state as “politically motivated”. PM Modi is set to attend various events in Madurai in southern Tamil Nadu, including the inauguration of the first phase of the AIIMS hospital project. He is also expected to visit the Thiruparankundram Temple amid the Karthigai Deepam-related controversy and participate in a public meeting organised by the NDA.

Stalin said he has been working for all sections of the population, including those who did not vote for his party. In contrast, he remarked that some leaders are visible in the state only during election time and increase their visits as polls approach.

Criticism over Union Budget allocations

The DMK leader also criticised the BJP-led central government, accusing it of neglecting Tamil Nadu. He pointed out that while approval was recently granted for the Gujarat Metro project, there were no major announcements or allocations for Tamil Nadu in the Union Budget.

Stalin asserted that voters would remember the lack of significant measures for the state. He framed the upcoming election as a contest between Tamil Nadu and the NDA, stating that the state should be governed from Fort St George in Chennai rather than from Delhi.

The ruling DMK is currently allied with several smaller parties and, at present, the Congress, as it seeks a third consecutive term in office. Its principal rival, the AIADMK, is aligned with the BJP as part of the NDA.

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Shashi Tharoor questions Centre over Kerala name change to Keralam

Shashi Tharoor has criticised the Centre’s decision to approve renaming Kerala as Keralam, questioning its impact and pointing to the lack of major projects for the state.

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shashi tharoor

Congress MP Shashi Tharoor has criticised the central government over its decision to approve the renaming of Kerala as ‘Keralam’, arguing that the move prioritises symbolism over development.

Reacting to the Union Cabinet’s approval, Tharoor said that the state’s name has always been ‘Keralam’ in Malayalam and questioned the practical impact of introducing the Malayalam term into English usage.

“It has already been ‘Keralam’ in Malayalam. So now, a Malayalam word is coming into English. I don’t know what difference it makes,” he said, adding that the state has not received major projects such as an AIIMS or new institutions from the Centre. He also pointed out that no significant allocations were made for Kerala in the Union Budget.

In a separate post on X, Tharoor raised what he described as a “small linguistic question” about what residents of the state would be called if the name change is implemented. Referring to existing terms such as “Keralite” and “Keralan”, he remarked that alternatives like “Keralamite” sounded like a microbe and “Keralamian” like a rare earth mineral.

The Union Cabinet, chaired by Prime Minister Narendra Modi, cleared the proposal on Tuesday. The move comes ahead of the upcoming state Assembly elections, in which 140 members of the legislative assembly are to be elected. The poll schedule is yet to be announced by the Election Commission of India.

The state assembly had earlier passed a resolution seeking the change in official records. Chief Minister Pinarayi Vijayan had moved the resolution in 2024, urging the Union government to adopt the name ‘Keralam’ in all languages listed in the Eighth Schedule of the Constitution.

He had stated that the demand for a united Kerala for Malayalam-speaking people dates back to the national freedom movement.

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Tamil Nadu potboiler: Now, Sasikala to launch new party ahead of election

Sasikala has announced the launch of a new political party ahead of the Tamil Nadu Assembly elections, positioning herself against AIADMK chief Edappadi K Palaniswami.

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In a significant political development ahead of the Tamil Nadu Assembly elections, expelled AIADMK leader V. K. Sasikala has announced that she will float a new political party and contest the polls by fielding her own candidates.

Speaking in Madurai before heading to Pasumpon for a public event, Sasikala said she would unveil her party’s flag later in the evening. She indicated that more details regarding the party’s structure and plans would be shared at the gathering.

The event venue carries political symbolism. Pasumpon is the birthplace of Thevar leader Muthuramalinga Thevar, and Sasikala herself belongs to the influential Thevar community in southern Tamil Nadu. The programme was held as part of birth anniversary events of former Chief Minister J. Jayalalithaa.

Direct challenge to EPS

Sasikala’s move is being viewed as a direct political challenge to AIADMK general secretary Edappadi K. Palaniswami (EPS). After Jayalalithaa’s death in 2016, Sasikala briefly took control of the party and had appointed Palaniswami as Chief Minister. However, following her conviction in the disproportionate assets case, she served a four-year prison term, and during that period, she was expelled from the party.

Palaniswami later aligned with O. Panneerselvam, whom Sasikala had earlier removed from the Chief Minister’s post. The two leaders subsequently adopted a dual leadership arrangement within the party and government.

Sasikala remains disqualified from contesting elections until 2027 due to her conviction. Nevertheless, she has stated that she intends to field candidates under her new party banner.

Fragmented Thevar vote base

Over the years, expulsions within the AIADMK — including Sasikala, her nephew TTV Dhinakaran and O Panneerselvam — have led to divisions within the Thevar support base. Political observers have linked this fragmentation to the party’s weakened electoral performance in the elections following Jayalalithaa’s passing.

While Dhinakaran has returned to the NDA fold, reports suggest Palaniswami is opposed to any arrangement that includes Sasikala or Panneerselvam. OPS, meanwhile, has exited the NDA.

Sasikala has repeatedly criticised Palaniswami, describing him as a betrayer, while he maintains that his leadership stems from the support of AIADMK legislators rather than her backing.

The AIADMK has not issued an official statement on Sasikala’s announcement. However, a senior party leader questioned her political standing, pointing out her disqualification from contesting elections and referring to legal issues linked to Jayalalithaa’s death.

With the Assembly polls approaching, Sasikala’s re-entry into active politics could further complicate the opposition space in Tamil Nadu and influence electoral calculations, particularly in the southern districts.

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